/* ===========================================
   อัยโนะ (Aino) - Gemini-like Design
   =========================================== */

/* === RESET === */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* Reset all heading elements */
h1, h2, h3, h4, h5, h6 {
    margin: 0;
    padding: 0;
    border: none;
    border-bottom: none;
    border-top: none;
    text-decoration: none;
    outline: none;
    box-shadow: none;
}

:root {
    /* === Color System === */
    --pink-50: #fdf2f8;
    --pink-100: #fce7f3;
    --pink-500: #ec4899;
    --pink-600: #db2777;
    
    --gray-50: #fafafa;
    --gray-100: #f5f5f5;
    --gray-200: #e5e5e5;
    --gray-300: #d4d4d4;
    --gray-400: #a3a3a3;
    --gray-500: #737373;
    --gray-600: #525252;
    --gray-700: #404040;
    --gray-800: #262626;
    --gray-900: #171717;
    
    /* === Light Theme === */
    --bg-base: #ffffff;
    --bg-elevated: #fafafa;
    --bg-overlay: rgba(255, 255, 255, 0.8);
    --bg-sidebar: #f9fafb;
    --bg-hover: #f5f5f5;
    
    --text-primary: #171717;
    --text-secondary: #525252;
    --text-tertiary: #a3a3a3;
    
    --border-subtle: #f0f0f0;
    --border-light: #e5e5e5;
    --border-medium: #d4d4d4;
    
    --accent: var(--pink-500);
    --accent-hover: var(--pink-600);
    
    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.03);
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.05), 0 1px 2px -1px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    
    /* Spacing Scale */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    
    /* Border Radius */
    --radius-xs: 0.25rem;
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 120ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Typography */
    --font-body: 'Sarabun', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-heading: 'Prompt', var(--font-body);
    
    /* Font Sizes */
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
    --text-4xl: 2.25rem;
}

[data-theme="dark"] {
    --bg-base: #1f1f1f;
    --bg-elevated: #2a2a2a;
    --bg-overlay: rgba(10, 10, 10, 0.8);
    --bg-sidebar: #1a1a1a;
    --bg-hover: #2f2f2f;
    
    --text-primary: #fafafa;
    --text-secondary: #a3a3a3;
    --text-tertiary: #737373;
    
    --border-subtle: #2f2f2f;
    --border-light: #3a3a3a;
    --border-medium: #404040;
    
    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.4), 0 1px 2px -1px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.5), 0 2px 4px -2px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.6), 0 4px 6px -4px rgba(0, 0, 0, 0.6);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.7), 0 8px 10px -6px rgba(0, 0, 0, 0.7);
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    scroll-behavior: smooth;
    -webkit-overflow-scrolling: touch;
    overflow-x: hidden;
    width: 100%;
    max-width: 100vw;
    /* Support for safe areas (notch) */
    padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
}

body {
    font-family: var(--font-body);
    font-size: var(--text-base);
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-base);
    overflow: hidden;
    height: 100vh;
    transition: background-color var(--transition-base), color var(--transition-base);
    touch-action: pan-x pan-y;
    overscroll-behavior-y: contain;
    -webkit-tap-highlight-color: transparent;
    width: 100%;
    max-width: 100vw;
    position: relative;
    /* Support for safe areas */
    padding-left: env(safe-area-inset-left, 0);
    padding-right: env(safe-area-inset-right, 0);
}

/* === APP WRAPPER === */
.app-wrapper {
    display: flex;
    height: 100vh;
    height: calc(100vh - env(safe-area-inset-top, 0) - env(safe-area-inset-bottom, 0));
    position: relative;
    width: 100%;
    max-width: 100vw;
    overflow: hidden;
    box-sizing: border-box;
}

.app-wrapper.sidebar-collapsed .header-left {
    margin-left: 0;
}

/* === SIDEBAR === */
.sidebar {
    width: 300px;
    background: var(--bg-sidebar);
    border-right: 2px solid var(--border-light);
    display: flex;
    flex-direction: column;
    transition: transform var(--transition-base);
    position: relative;
    z-index: 100;
    background: linear-gradient(180deg, var(--bg-sidebar) 0%, rgba(249, 250, 251, 0.5) 50%, var(--bg-elevated) 100%);
    overflow: hidden;
    /* Support for safe areas */
    padding-left: env(safe-area-inset-left, 0);
    padding-right: env(safe-area-inset-right, 0);
    height: 100vh;
    height: calc(100vh - env(safe-area-inset-top, 0) - env(safe-area-inset-bottom, 0));
    box-sizing: border-box;
}

[data-theme="dark"] .sidebar {
    background: linear-gradient(180deg, var(--bg-sidebar) 0%, rgba(26, 26, 26, 0.5) 50%, var(--bg-elevated) 100%);
}

.sidebar.collapsed {
    transform: translateX(-100%);
    width: 0;
    min-width: 0;
    border-right: none;
    overflow: hidden;
}

.sidebar-inner {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.sidebar-top {
    display: flex;
    gap: var(--space-2);
    padding: var(--space-3);
    border-bottom: 1px solid var(--border-subtle);
}

.sidebar-btn {
    flex: 1;
    padding: var(--space-2);
    background: transparent;
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    touch-action: manipulation;
}

.sidebar-btn:hover {
    background: var(--bg-hover);
    border-color: var(--border-medium);
    color: var(--text-primary);
}

.sidebar-header {
    padding: var(--space-4);
    border-bottom: 1px solid var(--border-subtle);
}

.btn-new {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    background: linear-gradient(135deg, var(--pink-500), var(--pink-600));
    border: none;
    border-radius: var(--radius-lg);
    color: white;
    font-size: var(--text-sm);
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    transition: all var(--transition-base);
    touch-action: manipulation;
    box-shadow: 0 4px 12px rgba(236, 72, 153, 0.3);
}

.btn-new:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(236, 72, 153, 0.4);
}

.btn-new:active {
    transform: translateY(0);
}

.btn-new svg {
    color: white;
}

.btn-new svg {
    width: 16px;
    height: 16px;
}

.btn-new-secondary {
    background: linear-gradient(135deg, var(--gray-600), var(--gray-700));
    box-shadow: 0 4px 12px rgba(107, 114, 128, 0.3);
}

.btn-new-secondary:hover {
    box-shadow: 0 6px 16px rgba(107, 114, 128, 0.4);
}

.sidebar-content {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-4);
}

.sidebar-section {
    margin-bottom: var(--space-6);
}

.section-title {
    font-size: var(--text-xs);
    font-weight: 600;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--space-3);
    padding: 0 var(--space-2);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.section-title::before {
    content: '';
    width: 4px;
    height: 4px;
    background: var(--accent);
    border-radius: var(--radius-full);
}

.history-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}

.history-item {
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: var(--text-sm);
    color: var(--text-secondary);
    transition: all var(--transition-fast);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    display: flex;
    align-items: center;
    gap: var(--space-2);
    position: relative;
    touch-action: manipulation;
}

.history-item:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
    border-left: 3px solid var(--accent);
    padding-left: calc(var(--space-4) - 3px);
}

.history-item.active {
    background: linear-gradient(90deg, var(--bg-elevated), transparent);
    color: var(--text-primary);
    font-weight: 600;
    border-left: 3px solid var(--accent);
    padding-left: calc(var(--space-4) - 3px);
}

.empty-history {
    padding: var(--space-8);
    text-align: center;
    color: var(--text-tertiary);
    font-size: var(--text-sm);
}

.sidebar-footer {
    padding: var(--space-4);
    border-top: 1px solid var(--border-subtle);
}

.footer-link {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: var(--text-sm);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: var(--space-2);
    transition: all var(--transition-fast);
    border-radius: var(--radius-md);
    touch-action: manipulation;
}

.footer-link:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.footer-link svg {
    width: 16px;
    height: 16px;
}

/* === MAIN === */
.main {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    position: relative;
}

/* === HEADER === */
.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-5) var(--space-8);
    background: var(--bg-base);
    border-bottom: none;
    z-index: 50;
    position: relative;
    box-shadow: none;
    transition: padding var(--transition-base);
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
    /* Support for safe areas */
    padding-left: max(var(--space-8), calc(var(--space-8) + env(safe-area-inset-left, 0)));
    padding-right: max(var(--space-8), calc(var(--space-8) + env(safe-area-inset-right, 0)));
    padding-top: max(var(--space-5), calc(var(--space-5) + env(safe-area-inset-top, 0)));
    overflow: hidden;
}

/* When sidebar is collapsed, header moves to edge - flush left */
.app-wrapper.sidebar-collapsed .header {
    padding-left: 0;
}

.app-wrapper.sidebar-collapsed .header-left {
    margin-left: 0;
    padding-left: 0;
    gap: var(--space-3);
}

.app-wrapper.sidebar-collapsed .header-menu {
    margin-left: 0;
}

[data-theme="dark"] .header {
    box-shadow: none;
}

.header-left {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    transition: gap var(--transition-base);
}

.header-menu {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: var(--space-2);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    touch-action: manipulation;
}

.header-menu:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.header-title {
    font-family: var(--font-heading);
    font-size: clamp(var(--text-base), 3vw, var(--text-xl));
    font-weight: 700;
    background: linear-gradient(135deg, var(--pink-500), var(--gray-600));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em;
    margin: 0;
    padding: 0;
    line-height: 1.2;
    border: none !important;
    border-bottom: none !important;
    border-top: none !important;
    text-decoration: none !important;
    outline: none !important;
    box-shadow: none !important;
    position: relative;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    display: inline-block;
    max-width: 100%;
}

.header-title::before,
.header-title::after {
    content: none !important;
    display: none !important;
    border: none !important;
    background: none !important;
}

.header-right {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.header-profile {
    background: transparent;
    border: 1px solid var(--border-light);
    border-radius: var(--radius-full);
    color: var(--text-secondary);
    cursor: pointer;
    padding: var(--space-2) var(--space-3);
    min-width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    transition: all var(--transition-fast);
    touch-action: manipulation;
}

.header-profile:hover {
    background: var(--bg-hover);
    border-color: var(--border-medium);
    color: var(--text-primary);
}

.header-profile svg {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.header-profile .profile-text {
    font-size: var(--text-sm);
    font-weight: 500;
    white-space: nowrap;
    display: inline;
}

.header-profile .profile-icon {
    flex-shrink: 0;
}

/* === PROFILE DROPDOWN MENU === */
.profile-menu-wrapper {
    position: relative;
}

.profile-dropdown {
    position: absolute;
    top: calc(100% + var(--space-2));
    right: 0;
    width: 320px;
    max-width: calc(100vw - var(--space-4) - env(safe-area-inset-left, 0) - env(safe-area-inset-right, 0));
    background: var(--bg-base);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px) scale(0.98);
    transition: all var(--transition-base);
    z-index: 1000;
    overflow: hidden;
    box-sizing: border-box;
}

.profile-dropdown.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

.profile-dropdown-header {
    padding: var(--space-4);
    display: flex;
    align-items: center;
    gap: var(--space-3);
    background: var(--bg-elevated);
    border-bottom: 1px solid var(--border-light);
}

.profile-avatar {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--pink-500), var(--purple-500));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    flex-shrink: 0;
    overflow: hidden;
}

.profile-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.profile-info {
    flex: 1;
    min-width: 0;
}

.profile-name {
    font-size: var(--text-base);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-1);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.profile-email {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-bottom: var(--space-1);
}

.profile-member-id {
    font-size: var(--text-xs);
    color: var(--text-tertiary);
    margin-bottom: var(--space-1);
    display: flex;
    align-items: center;
    gap: var(--space-1);
}

.member-id-label {
    opacity: 0.7;
}

.member-id-value {
    font-weight: 600;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    color: var(--text-secondary);
    letter-spacing: 0.5px;
}

.profile-tier {
    margin-top: var(--space-1);
}

.profile-dropdown-divider {
    height: 1px;
    background: var(--border-light);
    margin: var(--space-1) 0;
}

.profile-dropdown-menu {
    padding: var(--space-2) 0;
}

.profile-menu-item {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    display: flex;
    align-items: center;
    gap: var(--space-3);
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: var(--text-sm);
    font-weight: 500;
    cursor: pointer;
    transition: background var(--transition-fast);
    text-align: left;
}

.profile-menu-item:hover {
    background: var(--bg-hover);
}

.profile-menu-item:active {
    background: var(--bg-elevated);
}

.profile-menu-item svg {
    flex-shrink: 0;
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}

.profile-menu-item:hover svg {
    color: var(--text-primary);
}

.profile-menu-item span {
    flex: 1;
}

.profile-menu-item-admin svg {
    color: var(--green-500);
}

.profile-menu-item-admin:hover svg {
    color: var(--green-600);
}

.profile-menu-item-danger {
    color: var(--red-500);
}

.profile-menu-item-danger svg {
    color: var(--red-500);
}

.profile-menu-item-danger:hover {
    background: rgba(239, 68, 68, 0.1);
    color: var(--red-600);
}

.profile-menu-item-danger:hover svg {
    color: var(--red-600);
}

[data-theme="dark"] .profile-dropdown {
    background: var(--bg-secondary);
    border-color: var(--border-medium);
}

[data-theme="dark"] .profile-dropdown-header {
    background: var(--bg-primary);
    border-bottom-color: var(--border-medium);
}

[data-theme="dark"] .profile-dropdown-divider {
    background: var(--border-medium);
}

/* === TIER BADGE === */
.tier-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 2px 8px;
    border-radius: var(--radius-full);
    font-size: var(--text-xs);
    font-weight: 600;
    background: var(--bg-hover);
    border: 1px solid var(--border-light);
    color: var(--text-primary);
    white-space: nowrap;
}

.tier-badge i {
    font-size: 0.7rem;
    color: var(--tier-color, var(--gray-500));
}

.tier-badge-text {
    color: var(--tier-color, var(--gray-500));
}

/* Tier-specific colors */
.tier-badge-starter_trial {
    background: rgba(107, 114, 128, 0.1);
    border-color: rgba(107, 114, 128, 0.3);
}

.tier-badge-starter_trial .tier-badge-text {
    color: #6b7280;
}

.tier-badge-pro_trial {
    background: rgba(59, 130, 246, 0.1);
    border-color: rgba(59, 130, 246, 0.3);
}

.tier-badge-pro_trial .tier-badge-text {
    color: #3b82f6;
}

.tier-badge-ultra_trial {
    background: rgba(139, 92, 246, 0.1);
    border-color: rgba(139, 92, 246, 0.3);
}

.tier-badge-ultra_trial .tier-badge-text {
    color: #8b5cf6;
}

/* Legacy tier support (backward compatibility) */
.tier-badge-free_trial {
    background: rgba(107, 114, 128, 0.1);
    border-color: rgba(107, 114, 128, 0.3);
}

.tier-badge-free_trial .tier-badge-text {
    color: #6b7280;
}

.tier-badge-starter {
    background: rgba(107, 114, 128, 0.1);
    border-color: rgba(107, 114, 128, 0.3);
}

.tier-badge-starter .tier-badge-text {
    color: #6b7280;
}

.tier-badge-pro {
    background: rgba(59, 130, 246, 0.1);
    border-color: rgba(59, 130, 246, 0.3);
}

.tier-badge-pro i,
.tier-badge-pro .tier-badge-text {
    color: #3b82f6;
}

.tier-badge-ultra {
    background: rgba(139, 92, 246, 0.1);
    border-color: rgba(139, 92, 246, 0.3);
}

.tier-badge-ultra i,
.tier-badge-ultra .tier-badge-text {
    color: #8b5cf6;
}

.tier-badge-premium {
    background: rgba(236, 72, 153, 0.1);
    border-color: rgba(236, 72, 153, 0.3);
}

.tier-badge-premium i,
.tier-badge-premium .tier-badge-text {
    color: #ec4899;
}

.tier-badge-premium_plus {
    background: rgba(245, 158, 11, 0.1);
    border-color: rgba(245, 158, 11, 0.3);
}

.tier-badge-premium_plus i,
.tier-badge-premium_plus .tier-badge-text {
    color: #f59e0b;
}

.tier-badge-premium_pro {
    background: rgba(239, 68, 68, 0.1);
    border-color: rgba(239, 68, 68, 0.3);
}

.tier-badge-premium_pro i,
.tier-badge-premium_pro .tier-badge-text {
    color: #ef4444;
}

.tier-badge-admin {
    background: rgba(16, 185, 129, 0.1);
    border-color: rgba(16, 185, 129, 0.3);
}

.tier-badge-admin i,
.tier-badge-admin .tier-badge-text {
    color: #10b981;
}

[data-theme="dark"] .tier-badge {
    background: var(--bg-secondary);
    border-color: var(--border-medium);
}

[data-theme="dark"] .tier-badge-pro {
    background: rgba(59, 130, 246, 0.15);
    border-color: rgba(59, 130, 246, 0.4);
}

[data-theme="dark"] .tier-badge-ultra {
    background: rgba(139, 92, 246, 0.15);
    border-color: rgba(139, 92, 246, 0.4);
}

[data-theme="dark"] .tier-badge-premium {
    background: rgba(236, 72, 153, 0.15);
    border-color: rgba(236, 72, 153, 0.4);
}

[data-theme="dark"] .tier-badge-premium_plus {
    background: rgba(245, 158, 11, 0.15);
    border-color: rgba(245, 158, 11, 0.4);
}

[data-theme="dark"] .tier-badge-premium_pro {
    background: rgba(239, 68, 68, 0.15);
    border-color: rgba(239, 68, 68, 0.4);
}

[data-theme="dark"] .tier-badge-admin {
    background: rgba(16, 185, 129, 0.15);
    border-color: rgba(16, 185, 129, 0.4);
}

/* === MESSAGES AREA === */
.messages-area {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    position: relative;
    background: var(--bg-base);
    scroll-behavior: smooth;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior-y: contain;
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
}

/* === WELCOME === */
.welcome {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100%;
    padding: var(--space-8);
    animation: fadeIn 0.4s ease;
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
    /* Support for safe areas */
    padding-left: max(var(--space-8), calc(var(--space-8) + env(safe-area-inset-left, 0)));
    padding-right: max(var(--space-8), calc(var(--space-8) + env(safe-area-inset-right, 0)));
    overflow: hidden;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.welcome-content {
    max-width: 900px;
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-12);
    padding: 0 var(--space-2);
    box-sizing: border-box;
    /* Prevent overflow */
    overflow: hidden;
}

.welcome-header {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-4);
    text-align: center;
}

.welcome-icon {
    width: 100px;
    height: 100px;
    border-radius: var(--radius-2xl);
    background: linear-gradient(135deg, var(--pink-500) 0%, var(--pink-600) 50%, var(--gray-400) 100%);
    padding: var(--space-4);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 12px 32px rgba(236, 72, 153, 0.3);
    margin-bottom: var(--space-4);
    position: relative;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-10px);
    }
}

.welcome-icon::after {
    content: '';
    position: absolute;
    inset: -4px;
    border-radius: var(--radius-2xl);
    background: linear-gradient(135deg, var(--pink-500), var(--gray-400));
    opacity: 0.3;
    z-index: -1;
    filter: blur(12px);
}

.logo-img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    border-radius: var(--radius-xl);
    display: block;
    max-width: 100%;
    max-height: 100%;
}

.logo-img[src=""],
.logo-img:not([src]) {
    display: none;
}

/* Fallback for logo if image fails to load */
.welcome-icon:has(.logo-img[src=""])::before,
.welcome-icon:has(.logo-img:not([src]))::before {
    content: '🎯';
    font-size: 3rem;
    display: block;
}

.welcome-title {
    font-family: var(--font-heading);
    font-size: 3rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--pink-500) 0%, var(--pink-600) 50%, var(--gray-600) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.03em;
    line-height: 1.2;
    position: relative;
}

.welcome-subtitle {
    font-size: var(--text-lg);
    color: var(--text-secondary);
    max-width: 500px;
    line-height: 1.6;
}

/* === INPUT CONTAINER LARGE === */
.input-container-large {
    width: 100%;
    max-width: 768px;
    margin: 0 auto;
    box-sizing: border-box;
    /* Prevent overflow */
    overflow: hidden;
}

.input-box-large {
    display: flex;
    flex-direction: row;
    align-items: flex-end;
    gap: var(--space-3);
    background: var(--bg-elevated);
    border: 2px solid var(--border-light);
    border-radius: var(--radius-2xl);
    padding: var(--space-5);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
}

.input-box-large.drag-over {
    border-color: var(--accent);
    background: rgba(236, 72, 153, 0.05);
}

.attach-btn-group-large {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    flex-shrink: 0;
}

.attach-btn-large {
    padding: var(--space-2);
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-base);
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    touch-action: manipulation;
}

.attach-btn-large:hover {
    color: var(--accent);
    background: var(--bg-hover);
    transform: scale(1.08);
}

.attach-btn-large:active {
    transform: scale(0.95);
    transition: transform 0.1s ease;
}

.camera-btn-large {
    padding: var(--space-2);
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-base);
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    touch-action: manipulation;
}

.camera-btn-large:hover {
    color: var(--accent);
    background: var(--bg-hover);
    transform: scale(1.08);
}

.camera-btn-large:active {
    transform: scale(0.95);
    transition: transform 0.1s ease;
}

.input-box-large::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(236, 72, 153, 0.08), rgba(115, 115, 153, 0.05));
    opacity: 0;
    transition: opacity var(--transition-base);
    pointer-events: none;
    z-index: 0;
}

.input-box-large:focus-within {
    border-color: var(--accent);
    box-shadow: 0 12px 32px rgba(236, 72, 153, 0.2);
    transform: translateY(-2px);
}

.input-box-large:focus-within::before {
    opacity: 1;
}

.input-field-large {
    flex: 1;
    width: 100%;
    border: none;
    background: transparent;
    resize: none;
    font-family: var(--font-body);
    font-size: var(--text-lg);
    color: var(--text-primary);
    min-height: 60px;
    max-height: 200px;
    position: relative;
    z-index: 10;
    pointer-events: auto;
    cursor: text;
    overflow-y: auto;
    overflow-x: hidden;
    line-height: 1.6;
    padding: 0;
    box-sizing: border-box;
    word-wrap: break-word;
    overflow-wrap: break-word;
    /* Prevent zoom on iOS */
    font-size: 16px;
}

.input-field-large:focus {
    outline: none;
}

.input-field-large::placeholder {
    color: var(--text-tertiary);
}

.input-actions {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3);
    padding-top: var(--space-2);
    border-top: 1px solid var(--border-subtle);
    position: relative;
    z-index: 10;
}

.model-selector-large {
    padding: var(--space-2) var(--space-4);
    background: var(--bg-elevated);
    border: 2px solid var(--border-light);
    border-radius: var(--radius-lg);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--accent);
    transition: all var(--transition-base);
    touch-action: manipulation;
}

.model-selector-large:hover {
    background: linear-gradient(135deg, rgba(236, 72, 153, 0.1), rgba(115, 115, 115, 0.05));
    border-color: var(--accent);
    box-shadow: 0 4px 12px rgba(236, 72, 153, 0.2);
    transform: translateY(-1px);
}

.send-btn-large {
    padding: var(--space-2);
    background: linear-gradient(135deg, var(--pink-500), var(--pink-600));
    border: none;
    border-radius: var(--radius-md);
    color: white;
    cursor: pointer;
    transition: all var(--transition-base);
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px rgba(236, 72, 153, 0.3);
    touch-action: manipulation;
}

.send-btn-large:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--pink-600), var(--pink-500));
    transform: scale(1.08) translateY(-1px);
    box-shadow: 0 6px 16px rgba(236, 72, 153, 0.4);
}

.send-btn-large:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.send-btn-large.stop-btn {
    background: linear-gradient(135deg, #ef4444, #dc2626);
}

.send-btn-large.stop-btn:hover:not(:disabled) {
    background: linear-gradient(135deg, #dc2626, #b91c1c);
    box-shadow: 0 6px 16px rgba(220, 38, 38, 0.4);
}

.send-btn-large svg {
    width: 20px;
    height: 20px;
}

/* === SUGGESTIONS HORIZONTAL === */
.suggestions-horizontal {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-3);
    width: 100%;
    max-width: 600px;
}

.suggestion-btn {
    padding: var(--space-3) var(--space-5);
    background: var(--bg-elevated);
    border: 2px solid var(--border-light);
    border-radius: var(--radius-xl);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: var(--space-2);
    transition: all var(--transition-base);
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--text-primary);
    touch-action: manipulation;
    position: relative;
    overflow: hidden;
}

.suggestion-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--pink-500), var(--gray-400));
    opacity: 0;
    transition: opacity var(--transition-base);
}

.suggestion-btn:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(236, 72, 153, 0.2);
    color: white;
}

.suggestion-btn:hover::before {
    opacity: 0.1;
}

.suggestion-btn:hover svg {
    color: var(--accent);
    filter: brightness(1.2);
}

.suggestion-btn svg {
    width: 16px;
    height: 16px;
    color: var(--accent);
    position: relative;
    z-index: 1;
}

.suggestion-btn span {
    position: relative;
    z-index: 1;
}

/* === MESSAGES === */
.messages {
    display: flex;
    flex-direction: column;
    padding: var(--space-6) 0;
    min-height: 100%;
    max-width: 768px;
    margin: 0 auto;
    width: 100%;
    box-sizing: border-box;
    /* Prevent overflow */
    overflow-x: hidden;
    /* Support for safe areas */
    padding-left: max(var(--space-4), calc(var(--space-4) + env(safe-area-inset-left, 0)));
    padding-right: max(var(--space-4), calc(var(--space-4) + env(safe-area-inset-right, 0)));
}

.message {
    display: flex;
    gap: var(--space-3);
    padding: var(--space-4) var(--space-6);
    animation: messageSlideIn 0.35s cubic-bezier(0.16, 1, 0.3, 1);
    align-items: flex-start;
    max-width: 85%;
    overflow: hidden;
    position: relative;
    box-sizing: border-box;
    width: 100%;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

.message.assistant {
    align-self: flex-start;
    margin-right: auto;
    animation: messageSlideInLeft 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

.message.user {
    align-self: flex-end;
    margin-left: auto;
    flex-direction: row-reverse;
    animation: messageSlideInRight 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes messageSlideInLeft {
    from {
        opacity: 0;
        transform: translateX(-20px) translateY(8px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateX(0) translateY(0) scale(1);
    }
}

@keyframes messageSlideInRight {
    from {
        opacity: 0;
        transform: translateX(20px) translateY(8px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateX(0) translateY(0) scale(1);
    }
}

.message-avatar {
    width: 32px !important;
    height: 32px !important;
    min-width: 32px !important;
    min-height: 32px !important;
    border-radius: var(--radius-full);
    flex-shrink: 0;
    display: flex !important;
    align-items: center;
    justify-content: center;
    background: var(--accent);
    color: white;
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: visible !important;
    visibility: visible !important;
}

.message.assistant .message-avatar {
    background: transparent;
    padding: 0;
}

.message-avatar .avatar-img {
    width: 100% !important;
    height: 100% !important;
    object-fit: cover;
    border-radius: var(--radius-full);
    position: relative;
    z-index: 10 !important;
    display: block !important;
    visibility: visible !important;
    opacity: 1 !important;
}

/* Loading ring animation for AI avatar */
.message-avatar.loading {
    position: relative !important;
    overflow: visible !important;
}

/* Avatar ring wrapper */
.avatar-ring {
    position: absolute !important;
    border-radius: 50% !important;
    pointer-events: none;
    box-sizing: border-box;
    display: block !important;
    visibility: visible !important;
    opacity: 1 !important;
}

/* Outer ring - หมุนตามเข็มนาฬิกา */
.avatar-ring-outer {
    top: -5px !important;
    left: -5px !important;
    width: calc(100% + 10px) !important;
    height: calc(100% + 10px) !important;
    border: 3px solid transparent !important;
    border-top-color: #ec4899 !important;
    border-right-color: #737373 !important;
    animation: avatarSpin 1.5s linear infinite !important;
    z-index: 1 !important;
    display: block !important;
}

/* Inner ring - หมุนทวนเข็มนาฬิกา */
.avatar-ring-inner {
    top: -7px !important;
    left: -7px !important;
    width: calc(100% + 14px) !important;
    height: calc(100% + 14px) !important;
    border: 2.5px solid transparent !important;
    border-top-color: #ec4899 !important;
    border-right-color: #db2777 !important;
    border-bottom-color: #a3a3a3 !important;
    border-left-color: #737373 !important;
    animation: avatarSpinReverse 1.2s linear infinite !important;
    opacity: 0.9 !important;
    z-index: 0 !important;
    display: block !important;
}

@keyframes avatarSpin {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}

@keyframes avatarSpinReverse {
    0% {
        transform: rotate(360deg);
    }
    100% {
        transform: rotate(0deg);
    }
}

.message-content {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.message.assistant .message-content {
    align-items: flex-start;
}

.message.user .message-content {
    align-items: flex-end;
}

.message-bubble {
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-lg);
    max-width: 100%;
    word-wrap: break-word;
    overflow-wrap: break-word;
    word-break: break-word;
    position: relative;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
    box-sizing: border-box;
}

.message.assistant .message-bubble {
    background: var(--bg-elevated);
    border: 1px solid var(--border-light);
    border-bottom-left-radius: var(--radius-xs);
    box-shadow: var(--shadow-xs);
}

.message.user .message-bubble {
    background: linear-gradient(135deg, var(--pink-500), var(--pink-600));
    color: white;
    border-bottom-right-radius: var(--radius-xs);
    box-shadow: 0 4px 12px rgba(236, 72, 153, 0.3);
}

.message:hover .message-bubble {
    transform: translateY(-1px);
}

.message.user:hover .message-bubble {
    box-shadow: 0 6px 16px rgba(236, 72, 153, 0.4);
    transform: translateY(-1px) scale(1.01);
}

.message-text {
    color: var(--text-primary);
    line-height: 1.75;
    word-wrap: break-word;
    overflow-wrap: break-word;
    word-break: break-word;
    max-width: 100%;
}

.message.user .message-text {
    color: white;
}

.message-text p {
    margin-bottom: var(--space-3);
    word-wrap: break-word;
    overflow-wrap: break-word;
}

.message-text p:last-child {
    margin-bottom: 0;
}

/* Links - Safe & Secure */
.message-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-3);
    margin: var(--space-1) var(--space-1) var(--space-1) 0;
    background: linear-gradient(135deg, rgba(236, 72, 153, 0.1), rgba(236, 72, 153, 0.05));
    border: 1px solid rgba(236, 72, 153, 0.3);
    border-radius: var(--radius-lg);
    color: var(--accent);
    text-decoration: none;
    font-weight: 500;
    font-size: var(--text-sm);
    transition: all var(--transition-base);
    cursor: pointer;
    word-break: break-all;
    position: relative;
    box-shadow: 0 2px 4px rgba(236, 72, 153, 0.1);
    touch-action: manipulation;
}

.message-link::before {
    content: '🔗';
    font-size: 0.875em;
    opacity: 0.8;
    flex-shrink: 0;
}

.message-link:hover {
    background: linear-gradient(135deg, rgba(236, 72, 153, 0.2), rgba(236, 72, 153, 0.15));
    border-color: var(--accent);
    color: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(236, 72, 153, 0.25);
}

.message-link:active {
    transform: translateY(0);
    box-shadow: 0 2px 4px rgba(236, 72, 153, 0.15);
}

.message.user .message-link {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.15), rgba(255, 255, 255, 0.1));
    border-color: rgba(255, 255, 255, 0.3);
    color: rgba(255, 255, 255, 0.95);
}

.message.user .message-link:hover {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.25), rgba(255, 255, 255, 0.2));
    border-color: rgba(255, 255, 255, 0.5);
    color: white;
    box-shadow: 0 4px 12px rgba(255, 255, 255, 0.2);
}

.message.user .message-link::before {
    filter: brightness(1.2);
}

/* Tables - Beautiful & Readable */
.message-text table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    margin: var(--space-5) 0;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    background: var(--bg-base);
    display: table;
    max-width: 100%;
    overflow-x: auto;
    border: 1px solid var(--border-light);
}

.message-text table thead {
    background: linear-gradient(135deg, var(--bg-elevated), var(--bg-hover));
    border-bottom: 2px solid var(--border-medium);
}

.message-text table th {
    padding: var(--space-4) var(--space-5);
    text-align: left;
    font-weight: 600;
    color: var(--text-primary);
    border-bottom: 2px solid var(--border-medium);
    font-size: var(--text-sm);
    letter-spacing: 0.3px;
    white-space: nowrap;
}

.message-text table th:first-child {
    padding-left: var(--space-6);
}

.message-text table th:last-child {
    padding-right: var(--space-6);
}

.message-text table td {
    padding: var(--space-4) var(--space-5);
    border-bottom: 1px solid var(--border-subtle);
    color: var(--text-primary);
    font-size: var(--text-sm);
    line-height: 1.6;
    transition: background-color var(--transition-fast);
}

.message-text table td:first-child {
    padding-left: var(--space-6);
}

.message-text table td:last-child {
    padding-right: var(--space-6);
}

.message-text table tbody tr {
    transition: background-color var(--transition-fast);
}

.message-text table tbody tr:hover {
    background: var(--bg-hover);
}

.message-text table tbody tr:last-child td {
    border-bottom: none;
}

.message-text table tbody tr:nth-child(even) {
    background: rgba(0, 0, 0, 0.01);
}

.message-text table tbody tr:nth-child(even):hover {
    background: var(--bg-hover);
}

/* Code Blocks - Beautiful & Usable */
.code-block-wrapper {
    margin: var(--space-5) 0;
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: var(--gray-900);
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(255, 255, 255, 0.1);
    max-width: 100%;
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.code-block-wrapper:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

.code-block-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-3) var(--space-4);
    background: linear-gradient(135deg, rgba(0, 0, 0, 0.4), rgba(0, 0, 0, 0.3));
    border-bottom: 1px solid rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.code-block-lang {
    font-size: var(--text-xs);
    color: rgba(255, 255, 255, 0.7);
    text-transform: uppercase;
    font-weight: 700;
    letter-spacing: 1px;
    padding: var(--space-1) var(--space-2);
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-sm);
    font-family: 'Courier New', monospace;
}

.code-block-copy {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-1) var(--space-2);
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-sm);
    color: rgba(255, 255, 255, 0.8);
    font-size: var(--text-xs);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.code-block-copy:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.3);
    color: white;
}

.code-block-copy.copied {
    background: rgba(76, 175, 80, 0.2);
    border-color: rgba(76, 175, 80, 0.5);
    color: #4caf50;
}

.code-block-copy svg {
    flex-shrink: 0;
}

.code-block-pre {
    margin: 0;
    padding: var(--space-5);
    background: var(--gray-900);
    color: white;
    overflow-x: auto;
    font-size: var(--text-sm);
    line-height: 1.7;
    font-family: 'Courier New', 'Monaco', 'Menlo', 'Fira Code', 'Consolas', monospace;
    position: relative;
}

.code-block-pre::-webkit-scrollbar {
    height: 8px;
}

.code-block-pre::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.3);
}

.code-block-pre::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-full);
}

.code-block-pre::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.3);
}

.code-block-pre code {
    background: transparent;
    padding: 0;
    color: inherit;
    font-size: inherit;
    border-radius: 0;
    display: block;
    width: 100%;
    font-family: inherit;
}

.code-block-pre code.hljs {
    background: transparent;
    padding: 0;
}

/* Syntax Highlighting Enhancements */
.code-block-pre code .hljs-keyword,
.code-block-pre code .hljs-selector-tag,
.code-block-pre code .hljs-built_in,
.code-block-pre code .hljs-name,
.code-block-pre code .hljs-tag {
    color: #c792ea;
}

.code-block-pre code .hljs-string,
.code-block-pre code .hljs-title,
.code-block-pre code .hljs-section,
.code-block-pre code .hljs-attribute,
.code-block-pre code .hljs-literal,
.code-block-pre code .hljs-template-tag,
.code-block-pre code .hljs-template-variable,
.code-block-pre code .hljs-type,
.code-block-pre code .hljs-addition {
    color: #c3e88d;
}

.code-block-pre code .hljs-comment,
.code-block-pre code .hljs-quote,
.code-block-pre code .hljs-deletion,
.code-block-pre code .hljs-meta {
    color: #546e7a;
    font-style: italic;
}

.code-block-pre code .hljs-number,
.code-block-pre code .hljs-regexp,
.code-block-pre code .hljs-symbol,
.code-block-pre code .hljs-variable {
    color: #f78c6c;
}

.code-block-pre code .hljs-function,
.code-block-pre code .hljs-title.function_ {
    color: #82aaff;
}

.code-block-pre code .hljs-class,
.code-block-pre code .hljs-title.class_ {
    color: #ffcb6b;
}

.message-text pre {
    background: var(--gray-900);
    color: white;
    padding: var(--space-4);
    border-radius: var(--radius-md);
    overflow-x: auto;
    margin: var(--space-3) 0;
    font-size: var(--text-sm);
    line-height: 1.6;
    max-width: 100%;
}

.message.user .message-text pre {
    background: rgba(0, 0, 0, 0.3);
}

.message-text code:not(.hljs) {
    padding: 2px 6px;
    background: var(--bg-hover);
    border-radius: var(--radius-xs);
    color: var(--text-primary);
    font-size: var(--text-sm);
    font-family: 'Courier New', 'Monaco', 'Menlo', monospace;
}

.message.user .message-text code:not(.hljs) {
    background: rgba(0, 0, 0, 0.2);
    color: rgba(255, 255, 255, 0.95);
}

/* Lists */
.message-text ul,
.message-text ol {
    margin: var(--space-3) 0;
    padding-left: var(--space-6);
}

.message-text li {
    margin-bottom: var(--space-2);
    line-height: 1.6;
}

.message-text ul {
    list-style-type: disc;
}

.message-text ol {
    list-style-type: decimal;
}

/* Headings */
.message-text h1,
.message-text h2,
.message-text h3,
.message-text h4,
.message-text h5,
.message-text h6 {
    margin: var(--space-4) 0 var(--space-2) 0;
    font-weight: 600;
    line-height: 1.3;
    color: var(--text-primary);
}

.message-text h1 {
    font-size: 1.5rem;
}

.message-text h2 {
    font-size: 1.25rem;
}

.message-text h3 {
    font-size: 1.125rem;
}

.message-text h4,
.message-text h5,
.message-text h6 {
    font-size: 1rem;
}

.message-actions {
    display: flex;
    gap: var(--space-2);
    opacity: 0;
    transition: opacity var(--transition-base);
    padding: 0 var(--space-2);
}

.message:hover .message-actions {
    opacity: 1;
}

.message.assistant .message-actions {
    justify-content: flex-start;
}

.message.user .message-actions {
    justify-content: flex-end;
}

.btn-message-action {
    padding: var(--space-1) var(--space-2);
    background: var(--bg-base);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: var(--text-xs);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: var(--space-1);
    box-shadow: var(--shadow-xs);
    touch-action: manipulation;
}

.btn-message-action:hover {
    background: var(--bg-hover);
    border-color: var(--accent);
    color: var(--accent);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.btn-message-action.btn-feedback {
    position: relative;
}

.btn-message-action.btn-feedback.active {
    background: var(--bg-elevated);
    border-color: var(--accent);
    color: var(--accent);
}

.btn-message-action.btn-feedback[data-feedback-type="like"].active {
    background: rgba(34, 197, 94, 0.1);
    border-color: #22c55e;
    color: #22c55e;
}

.btn-message-action.btn-feedback[data-feedback-type="dislike"].active {
    background: rgba(239, 68, 68, 0.1);
    border-color: #ef4444;
    color: #ef4444;
}

.btn-message-action.btn-feedback[data-feedback-type="like"].active svg {
    fill: #22c55e;
}

.btn-message-action.btn-feedback[data-feedback-type="dislike"].active svg {
    fill: #ef4444;
}

.message-loading {
    display: flex;
    gap: var(--space-2);
    align-items: center;
    padding: var(--space-2) 0;
}

.loading-dot {
    width: 6px;
    height: 6px;
    border-radius: var(--radius-full);
    background: var(--text-secondary);
    animation: dotPulse 1.4s infinite ease-in-out;
}

.message.user .loading-dot {
    background: rgba(255, 255, 255, 0.7);
}

.loading-dot:nth-child(1) {
    animation-delay: 0s;
}

.loading-dot:nth-child(2) {
    animation-delay: 0.2s;
}

.loading-dot:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes dotPulse {
    0%, 60%, 100% {
        opacity: 0.3;
        transform: scale(0.9);
    }
    30% {
        opacity: 1;
        transform: scale(1);
    }
}

/* === INPUT SECTION === */
.input-section {
    padding: var(--space-4) var(--space-6);
    background: var(--bg-base);
    border-top: 1px solid var(--border-subtle);
    position: sticky;
    bottom: 0;
    z-index: 50;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    background: rgba(255, 255, 255, 0.95);
    display: none;
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
    /* Support for safe areas */
    padding-bottom: max(var(--space-4), calc(var(--space-4) + env(safe-area-inset-bottom, 0)));
    padding-left: max(var(--space-6), calc(var(--space-6) + env(safe-area-inset-left, 0)));
    padding-right: max(var(--space-6), calc(var(--space-6) + env(safe-area-inset-right, 0)));
    overflow: hidden;
}

[data-theme="dark"] .input-section {
    background: rgba(31, 31, 31, 0.95);
}

.input-section.active {
    display: block;
}

.input-container {
    max-width: 768px;
    margin: 0 auto;
    width: 100%;
    box-sizing: border-box;
    /* Prevent overflow */
    overflow: hidden;
}

.input-box {
    display: flex;
    align-items: flex-end;
    gap: var(--space-3);
    background: var(--bg-elevated);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-xl);
    padding: var(--space-3) var(--space-4);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

.input-box:focus-within {
    border-color: var(--accent);
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

.input-section.drag-over {
    border-color: var(--accent);
    background: rgba(236, 72, 153, 0.05);
}

/* Image Preview Container */
.image-preview-container {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    padding: var(--space-3);
    margin-bottom: var(--space-2);
    background: var(--bg-elevated);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    max-width: 100%;
}

.image-preview-item {
    position: relative;
    width: 80px;
    height: 80px;
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 2px solid var(--border-light);
    background: var(--bg-base);
    flex-shrink: 0;
}

.image-preview-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.image-preview-remove {
    position: absolute;
    top: -4px;
    right: -4px;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--error);
    color: white;
    border: 2px solid var(--bg-base);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 18px;
    line-height: 1;
    font-weight: bold;
    transition: all var(--transition-base);
    z-index: 10;
}

.image-preview-remove:hover {
    background: var(--error-hover);
    transform: scale(1.1);
}

/* Message Images */
.message-images {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    margin-bottom: var(--space-3);
}

.message-image-item {
    position: relative;
    max-width: 300px;
    max-height: 300px;
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid var(--border-light);
    background: var(--bg-elevated);
}

.message-image {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
    cursor: pointer;
    transition: transform var(--transition-base);
}

.message-image:hover {
    transform: scale(1.02);
}

.message.user .message-image-item {
    max-width: 250px;
}

[data-theme="dark"] .image-preview-container,
[data-theme="dark"] .message-image-item {
    border-color: var(--border-dark);
}

[data-theme="dark"] .image-preview-item {
    background: var(--bg-elevated-dark);
}

.input-field {
    flex: 1;
    border: none;
    background: transparent;
    resize: none;
    font-family: var(--font-body);
    font-size: var(--text-base);
    color: var(--text-primary);
    padding: var(--space-2) 0;
    min-height: 24px;
    max-height: 200px;
    overflow-y: auto;
    line-height: 1.5;
    position: relative;
    z-index: 10;
    pointer-events: auto;
    cursor: text;
}

.input-field:focus {
    outline: none;
}

.input-field::placeholder {
    color: var(--text-tertiary);
}

.attach-btn-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
    flex-shrink: 0;
}

.attach-btn {
    padding: var(--space-2);
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-base);
    flex-shrink: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    touch-action: manipulation;
}

.attach-btn:hover {
    color: var(--accent);
    background: var(--bg-hover);
    transform: scale(1.08);
}

.attach-btn:active {
    transform: scale(0.95);
    transition: transform 0.1s ease;
}

.camera-btn {
    padding: var(--space-2);
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-base);
    flex-shrink: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    touch-action: manipulation;
}

.camera-btn:hover {
    color: var(--accent);
    background: var(--bg-hover);
    transform: scale(1.08);
}

.camera-btn:active {
    transform: scale(0.95);
    transition: transform 0.1s ease;
}

.send-btn {
    padding: var(--space-2);
    background: var(--accent);
    border: none;
    border-radius: var(--radius-md);
    color: white;
    cursor: pointer;
    transition: all var(--transition-base);
    flex-shrink: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-sm);
    touch-action: manipulation;
}

.send-btn:hover:not(:disabled) {
    background: var(--accent-hover);
    transform: scale(1.08) translateY(-1px);
    box-shadow: var(--shadow-md);
}

.send-btn:active:not(:disabled) {
    transform: scale(0.95) translateY(0);
    transition: transform 0.1s ease;
}

.send-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.send-btn.stop-btn {
    background: #ef4444;
}

.send-btn.stop-btn:hover:not(:disabled) {
    background: #dc2626;
    box-shadow: 0 4px 12px rgba(220, 38, 38, 0.3);
}

.input-note {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    font-size: var(--text-xs);
    color: var(--text-tertiary);
    text-align: center;
    margin-top: var(--space-2);
    padding: var(--space-2);
}

.input-note svg {
    flex-shrink: 0;
    color: var(--text-tertiary);
}

.ai-disclaimer {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    font-size: var(--text-xs);
    color: var(--text-tertiary);
    text-align: center;
    margin-top: var(--space-4);
    padding: var(--space-3) var(--space-4);
    background: var(--bg-elevated);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-subtle);
}

.ai-disclaimer svg {
    flex-shrink: 0;
    color: var(--text-tertiary);
}

.ai-disclaimer span {
    line-height: 1.5;
}

/* === MODEL MENU === */
.model-menu {
    position: fixed;
    width: 280px;
    background: var(--bg-base);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    padding: var(--space-2);
    display: none;
    z-index: 2000;
    animation: slideDown 0.2s ease;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity var(--transition-fast), visibility var(--transition-fast), transform var(--transition-fast);
}

.model-menu.active {
    display: block;
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.model-menu-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.model-menu-item:hover:not(.disabled) {
    background: var(--bg-hover);
}

.model-menu-item.active {
    background: var(--bg-elevated);
}

.model-menu-item.disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.model-menu-content {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.model-menu-name {
    font-weight: 500;
    color: var(--text-primary);
    font-size: var(--text-sm);
}

.model-menu-desc {
    font-size: var(--text-xs);
    color: var(--text-tertiary);
}

.model-menu-check {
    color: var(--accent);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.model-menu-item.active .model-menu-check {
    opacity: 1;
}

/* === SIDEBAR OVERLAY === */
.sidebar-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(4px);
    z-index: 99;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
}

.sidebar-overlay.active {
    opacity: 1;
    visibility: visible;
}

/* === WELCOME MODAL === */
.welcome-modal {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 3000;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
}

.welcome-modal.active {
    opacity: 1;
    visibility: visible;
}

.welcome-modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.welcome-modal-dialog {
    position: relative;
    z-index: 1;
    width: 90%;
    max-width: 520px;
    animation: welcomeModalSlideIn 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes welcomeModalSlideIn {
    from {
        opacity: 0;
        transform: translateY(20px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.welcome-modal-content {
    background: var(--bg-base);
    border-radius: var(--radius-2xl);
    padding: var(--space-8) var(--space-6);
    box-shadow: var(--shadow-xl);
    text-align: center;
}

.welcome-modal-title {
    font-family: var(--font-heading);
    font-size: var(--text-2xl);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-4);
    line-height: 1.3;
}

.welcome-modal-desc {
    font-size: var(--text-base);
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--space-8);
    max-width: 420px;
    margin-left: auto;
    margin-right: auto;
}

.welcome-modal-actions {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    margin-bottom: var(--space-6);
}

.welcome-modal-btn {
    width: 100%;
    padding: var(--space-4) var(--space-6);
    border-radius: var(--radius-lg);
    font-size: var(--text-base);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    border: none;
    touch-action: manipulation;
}

.welcome-modal-btn-primary {
    background: linear-gradient(135deg, var(--pink-500), var(--pink-600));
    color: white;
    box-shadow: 0 4px 12px rgba(236, 72, 153, 0.3);
}

.welcome-modal-btn-primary:hover {
    background: linear-gradient(135deg, var(--pink-600), var(--pink-500));
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(236, 72, 153, 0.4);
}

.welcome-modal-btn-secondary {
    background: var(--bg-elevated);
    color: var(--text-primary);
    border: 1px solid var(--border-light);
}

.welcome-modal-btn-secondary:hover {
    background: var(--bg-hover);
    border-color: var(--border-medium);
}

.welcome-modal-btn-tertiary {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-light);
}

.welcome-modal-btn-tertiary:hover {
    background: var(--bg-elevated);
    color: var(--text-primary);
}

.welcome-modal-disclaimer {
    font-size: var(--text-xs);
    color: var(--text-tertiary);
    line-height: 1.5;
    margin-top: var(--space-6);
    padding-top: var(--space-6);
    border-top: 1px solid var(--border-subtle);
}

[data-theme="dark"] .welcome-modal-backdrop {
    background: rgba(0, 0, 0, 0.75);
}

[data-theme="dark"] .welcome-modal-content {
    background: var(--bg-elevated);
    border: 1px solid var(--border-light);
}

/* === LINK CONFIRMATION MODAL === */
.link-confirmation-modal {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 4000;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
}

.link-confirmation-modal.active {
    opacity: 1;
    visibility: visible;
}

.link-confirmation-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.link-confirmation-dialog {
    position: relative;
    z-index: 1;
    width: 90%;
    max-width: 420px;
    animation: linkModalSlideIn 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes linkModalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-20px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.link-confirmation-content {
    background: var(--bg-base);
    border-radius: var(--radius-2xl);
    padding: var(--space-6);
    box-shadow: var(--shadow-xl);
    text-align: center;
}

.link-confirmation-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--space-4);
    color: var(--accent);
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(236, 72, 153, 0.1);
    border-radius: 50%;
}

.link-confirmation-title {
    font-family: var(--font-heading);
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-4);
    line-height: 1.3;
}

.link-confirmation-url {
    font-size: var(--text-sm);
    color: var(--accent);
    word-break: break-all;
    background: var(--bg-elevated);
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-4);
    border: 1px solid var(--border-light);
    font-family: 'Courier New', monospace;
}

.link-confirmation-warning {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--space-6);
}

.link-confirmation-actions {
    display: flex;
    gap: var(--space-3);
}

.link-confirmation-btn {
    flex: 1;
    padding: var(--space-3) var(--space-5);
    border-radius: var(--radius-lg);
    font-size: var(--text-base);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    border: none;
    touch-action: manipulation;
}

.link-confirmation-btn-cancel {
    background: var(--bg-elevated);
    color: var(--text-primary);
    border: 1px solid var(--border-light);
}

.link-confirmation-btn-cancel:hover {
    background: var(--bg-hover);
    border-color: var(--border-medium);
}

.link-confirmation-btn-confirm {
    background: linear-gradient(135deg, var(--pink-500), var(--pink-600));
    color: white;
    box-shadow: 0 4px 12px rgba(236, 72, 153, 0.3);
}

.link-confirmation-btn-confirm:hover {
    background: linear-gradient(135deg, var(--pink-600), var(--pink-500));
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(236, 72, 153, 0.4);
}

[data-theme="dark"] .link-confirmation-backdrop {
    background: rgba(0, 0, 0, 0.75);
}

[data-theme="dark"] .link-confirmation-content {
    background: var(--bg-elevated);
    border: 1px solid var(--border-light);
}

/* === MODAL === */
.modal {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
}

.modal.active {
    opacity: 1;
    visibility: visible;
}

.modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(8px);
}

.modal-dialog {
    background: var(--bg-base);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-xl);
    width: 90%;
    max-width: 480px;
    z-index: 1001;
    transform: scale(0.95) translateY(10px);
    transition: transform var(--transition-base);
}

.modal.active .modal-dialog {
    transform: scale(1) translateY(0);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-6);
    border-bottom: 1px solid var(--border-subtle);
}

.modal-title {
    font-family: var(--font-heading);
    font-size: var(--text-xl);
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.modal-close {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: var(--space-2);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    touch-action: manipulation;
}

.modal-close:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.modal-body {
    padding: var(--space-6);
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: var(--space-3);
    padding: var(--space-6);
    border-top: 1px solid var(--border-subtle);
}

.form-group {
    margin-bottom: var(--space-5);
}

.form-group:last-child {
    margin-bottom: 0;
}

.form-label {
    display: block;
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-2);
}

.form-input,
.form-textarea {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    background: var(--bg-elevated);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    font-size: var(--text-base);
    color: var(--text-primary);
    font-family: var(--font-body);
    transition: all var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(236, 72, 153, 0.1);
}

.form-textarea {
    resize: vertical;
    min-height: 80px;
    line-height: 1.5;
}

.btn {
    padding: var(--space-3) var(--space-5);
    border-radius: var(--radius-lg);
    font-size: var(--text-base);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    border: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    touch-action: manipulation;
}

.btn-primary {
    background: linear-gradient(135deg, var(--pink-500), var(--pink-600));
    color: white;
    box-shadow: 0 4px 12px rgba(236, 72, 153, 0.3);
}

.btn-primary:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--pink-600), var(--pink-500));
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(236, 72, 153, 0.4);
}

.btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-secondary {
    background: var(--bg-elevated);
    color: var(--text-primary);
    border: 1px solid var(--border-light);
}

.btn-secondary:hover {
    background: var(--bg-hover);
    border-color: var(--border-medium);
}

.setting-group {
    margin-bottom: var(--space-8);
}

.setting-group:last-child {
    margin-bottom: 0;
}

.setting-label {
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-4);
    letter-spacing: 0.01em;
}

.theme-switcher {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-3);
}

.theme-option {
    padding: var(--space-5) var(--space-4);
    background: var(--bg-elevated);
    border: 2px solid var(--border-light);
    border-radius: var(--radius-lg);
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-3);
    transition: all var(--transition-base);
    touch-action: manipulation;
}

.theme-option:hover {
    border-color: var(--accent);
    box-shadow: var(--shadow-sm);
}

.theme-option.active {
    background: var(--bg-elevated);
    border-color: var(--accent);
}

.theme-option svg {
    color: var(--accent);
}

.theme-option span {
    font-weight: 500;
    color: var(--text-primary);
    font-size: var(--text-sm);
}

.setting-action {
    width: 100%;
    padding: var(--space-4) var(--space-5);
    background: var(--bg-elevated);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: var(--text-sm);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    transition: all var(--transition-fast);
    touch-action: manipulation;
}

.setting-action:hover {
    background: var(--bg-hover);
    border-color: var(--border-medium);
}

.about-content {
    padding: var(--space-4);
    background: var(--bg-elevated);
    border-radius: var(--radius-lg);
}

.about-name {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-2);
    font-size: var(--text-base);
}

.about-desc {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    margin-bottom: var(--space-2);
    line-height: 1.6;
}

.about-desc:last-child {
    margin-bottom: 0;
}

/* === LOADING === */
.loading {
    position: fixed;
    inset: 0;
    background: var(--bg-overlay);
    backdrop-filter: blur(12px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    animation: fadeIn 0.2s ease;
}

.loading.active {
    display: flex;
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-light);
    border-top-color: var(--accent);
    border-radius: var(--radius-full);
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* === TOASTS === */
.toasts {
    position: fixed;
    top: var(--space-6);
    right: var(--space-6);
    z-index: 3000;
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    pointer-events: none;
}

.toast {
    padding: var(--space-4) var(--space-5);
    background: var(--bg-base);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    font-size: var(--text-sm);
    font-weight: 400;
    display: flex;
    align-items: center;
    gap: var(--space-3);
    pointer-events: all;
    animation: toastSlideIn 0.3s ease;
    max-width: 320px;
    color: var(--text-primary);
}

@keyframes toastSlideIn {
    from {
        opacity: 0;
        transform: translateX(100px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.toast.success {
    border-left: 3px solid #10b981;
}

.toast.error {
    border-left: 3px solid #ef4444;
}

.toast.info {
    border-left: 3px solid var(--accent);
}

.toast.removing {
    animation: toastSlideOut 0.3s ease forwards;
}

@keyframes toastSlideOut {
    to {
        opacity: 0;
        transform: translateX(100px);
    }
}

/* === SCROLLBAR === */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--gray-300);
    border-radius: var(--radius-full);
    transition: background var(--transition-base);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent);
}

[data-theme="dark"] ::-webkit-scrollbar-thumb {
    background: var(--gray-600);
}

[data-theme="dark"] ::-webkit-scrollbar-thumb:hover {
    background: var(--accent);
}

/* === RESPONSIVE === */

/* Large Desktop (1440px+) */
@media (min-width: 1440px) {
    .messages {
        max-width: 900px;
    }
    
    .input-container-large,
    .input-container {
        max-width: 900px;
    }
}

/* Desktop (1024px - 1439px) */
@media (max-width: 1439px) {
    .messages {
        max-width: 768px;
    }
}

/* Tablet Landscape (1024px - 1279px) */
@media (max-width: 1279px) {
    .sidebar {
        width: 260px;
    }
    
    .header {
        padding: var(--space-4) var(--space-6);
    }
    
    .welcome-title {
        font-size: 2.5rem;
    }
    
    .welcome-icon {
        width: 90px;
        height: 90px;
    }
}

/* Tablet Portrait (768px - 1023px) */
@media (max-width: 1023px) {
    .sidebar {
        position: fixed;
        left: 0;
        top: 0;
        height: 100%;
        z-index: 200;
        transform: translateX(-100%);
        box-shadow: var(--shadow-xl);
        width: 280px;
    }
    
    .sidebar.active {
        transform: translateX(0);
    }
    
    .header {
        padding: var(--space-4) var(--space-5);
    }
    
    .welcome {
        padding: var(--space-6);
    }
    
    .welcome-content {
        gap: var(--space-8);
        max-width: 100%;
    }
    
    .welcome-title {
        font-size: 2.25rem;
    }
    
    .welcome-icon {
        width: 80px;
        height: 80px;
    }
    
    .input-container-large {
        max-width: 100%;
        padding: 0 var(--space-4);
    }
    
    .input-box-large {
        padding: var(--space-4);
    }
    
    .suggestions-horizontal {
        max-width: 100%;
        padding: 0 var(--space-4);
    }
    
    .model-menu {
        right: var(--space-4);
        width: 260px;
    }
}

/* Mobile Landscape (640px - 767px) */
@media (max-width: 767px) {
    html {
        font-size: 15px;
    }
    
    .app-wrapper {
        height: calc(100vh - env(safe-area-inset-top, 0) - env(safe-area-inset-bottom, 0));
    }
    
    .sidebar {
        padding-top: env(safe-area-inset-top, 0);
        padding-bottom: env(safe-area-inset-bottom, 0);
        height: calc(100vh - env(safe-area-inset-top, 0) - env(safe-area-inset-bottom, 0));
    }
    
    .header {
        padding: var(--space-3) max(var(--space-4), calc(var(--space-4) + env(safe-area-inset-left, 0))) var(--space-3) max(var(--space-4), calc(var(--space-4) + env(safe-area-inset-right, 0)));
        padding-top: max(var(--space-3), calc(var(--space-3) + env(safe-area-inset-top, 0)));
    }
    
    .header-title {
        font-size: var(--text-lg);
    }
    
    .welcome {
        padding: var(--space-4) max(var(--space-4), calc(var(--space-4) + env(safe-area-inset-left, 0))) var(--space-4) max(var(--space-4), calc(var(--space-4) + env(safe-area-inset-right, 0)));
    }
    
    .welcome-content {
        gap: var(--space-6);
        padding: 0 var(--space-2);
        max-width: 100%;
        box-sizing: border-box;
    }
    
    .welcome-header {
        gap: var(--space-3);
    }
    
    .welcome-title {
        font-size: clamp(1.5rem, 6vw, 1.875rem);
        padding: 0 var(--space-2);
    }
    
    .welcome-subtitle {
        font-size: clamp(var(--text-sm), 3vw, var(--text-base));
        padding: 0 var(--space-2);
    }
    
    .welcome-icon {
        width: 70px;
        height: 70px;
        margin-bottom: var(--space-2);
    }
    
    .input-container-large {
        padding: 0 max(var(--space-3), calc(var(--space-3) + env(safe-area-inset-left, 0))) 0 max(var(--space-3), calc(var(--space-3) + env(safe-area-inset-right, 0)));
        width: 100%;
        max-width: 100%;
        box-sizing: border-box;
    }
    
    .input-box-large {
        padding: var(--space-3) var(--space-4);
        border-radius: var(--radius-xl);
        width: 100%;
        box-sizing: border-box;
    }
    
    .input-field-large {
        font-size: 16px; /* Prevent zoom on iOS */
        min-height: 50px;
        width: 100%;
        box-sizing: border-box;
    }
    
    .input-actions {
        padding-top: var(--space-3);
    }
    
    .model-selector-large {
        padding: var(--space-2) var(--space-3);
        font-size: var(--text-xs);
    }
    
    .send-btn-large {
        width: 44px;
        height: 44px;
        min-width: 44px;
        min-height: 44px;
    }
    
    .suggestions-horizontal {
        grid-template-columns: 1fr;
        gap: var(--space-2);
        padding: 0 max(var(--space-3), calc(var(--space-3) + env(safe-area-inset-left, 0))) 0 max(var(--space-3), calc(var(--space-3) + env(safe-area-inset-right, 0)));
        width: 100%;
        max-width: 100%;
        box-sizing: border-box;
    }
    
    .suggestion-btn {
        padding: var(--space-3) var(--space-4);
        font-size: var(--text-sm);
        min-height: 44px;
    }
    
    .message {
        padding: var(--space-3) var(--space-4);
        max-width: 90%;
        gap: var(--space-2);
        box-sizing: border-box;
    }
    
    .messages {
        padding: var(--space-4) max(var(--space-2), calc(var(--space-2) + env(safe-area-inset-left, 0))) var(--space-4) max(var(--space-2), calc(var(--space-2) + env(safe-area-inset-right, 0)));
        max-width: 100%;
        width: 100%;
        box-sizing: border-box;
    }
    
    .message-avatar {
        width: 28px;
        height: 28px;
        min-width: 28px;
        min-height: 28px;
    }
    
    .message-bubble {
        padding: var(--space-2) var(--space-3);
        word-wrap: break-word;
        overflow-wrap: break-word;
        max-width: 100%;
    }
    
    .input-section {
        padding: var(--space-3) max(var(--space-4), calc(var(--space-4) + env(safe-area-inset-left, 0))) max(var(--space-3), calc(var(--space-3) + env(safe-area-inset-bottom, 0))) max(var(--space-4), calc(var(--space-4) + env(safe-area-inset-right, 0)));
        width: 100%;
        box-sizing: border-box;
    }
    
    .input-box {
        padding: var(--space-2) var(--space-3);
        width: 100%;
        box-sizing: border-box;
    }
    
    .send-btn {
        width: 40px;
        height: 40px;
        min-width: 40px;
        min-height: 40px;
    }
    
    .modal-dialog {
        width: calc(100% - var(--space-4));
        max-width: calc(100vw - var(--space-4) - env(safe-area-inset-left, 0) - env(safe-area-inset-right, 0));
        margin: var(--space-4);
        max-height: calc(90vh - env(safe-area-inset-top, 0) - env(safe-area-inset-bottom, 0) - var(--space-8));
        box-sizing: border-box;
    }
    
    .modal-header,
    .modal-body {
        padding: var(--space-4);
    }
}

/* Mobile Portrait (480px - 639px) */
@media (max-width: 639px) {
    .sidebar {
        width: 100%;
        max-width: 320px;
    }
    
    .header {
        padding: var(--space-3);
    }
    
    .header-left {
        gap: var(--space-2);
    }
    
    .header-menu {
        width: 32px;
        height: 32px;
    }
    
    .header-title {
        font-size: var(--text-base);
    }
    
    .header-profile {
        width: 32px;
        height: 32px;
    }
    
    .welcome {
        padding: var(--space-3);
    }
    
    .welcome-content {
        gap: var(--space-5);
    }
    
    .welcome-title {
        font-size: 1.5rem;
    }
    
    .welcome-subtitle {
        font-size: var(--text-sm);
    }
    
    .welcome-icon {
        width: 60px;
        height: 60px;
        padding: var(--space-2);
    }
    
    .input-container-large {
        padding: 0 var(--space-2);
    }
    
    .input-box-large {
        padding: var(--space-3);
        border-radius: var(--radius-lg);
    }
    
    .input-field-large {
        font-size: var(--text-sm);
        min-height: 44px;
    }
    
    .input-actions {
        flex-direction: column;
        gap: var(--space-2);
        align-items: stretch;
    }
    
    .model-selector-large {
        width: 100%;
        justify-content: center;
    }
    
    .send-btn-large {
        width: 100%;
        height: 44px;
    }
    
    .suggestions-horizontal {
        padding: 0 var(--space-2);
    }
    
    .suggestion-btn {
        padding: var(--space-2) var(--space-3);
        justify-content: center;
    }
    
    .message {
        padding: var(--space-2) var(--space-3);
        max-width: 95%;
    }
    
    .message-avatar {
        width: 24px;
        height: 24px;
    }
    
    .message-bubble {
        padding: var(--space-2);
        font-size: var(--text-sm);
    }
    
    .input-section {
        padding: var(--space-2) var(--space-3);
    }
    
    .input-box {
        padding: var(--space-2);
    }
    
    .input-field {
        font-size: var(--text-sm);
    }
    
    .send-btn {
        width: 32px;
        height: 32px;
    }
    
    .btn-new {
        padding: var(--space-2) var(--space-3);
        font-size: var(--text-xs);
    }
    
    .history-item {
        padding: var(--space-2) var(--space-3);
        font-size: var(--text-xs);
    }
    
    .footer-link {
        padding: var(--space-2) var(--space-3);
        font-size: var(--text-xs);
    }
    
    .toasts {
        top: var(--space-4);
        right: var(--space-4);
        left: var(--space-4);
    }
    
    .toast {
        max-width: 100%;
    }
}

/* Small Mobile (320px - 479px) */
@media (max-width: 479px) {
    html {
        font-size: 13px;
    }
    
    .header {
        padding: var(--space-2) max(var(--space-3), calc(var(--space-3) + env(safe-area-inset-left, 0))) var(--space-2) max(var(--space-3), calc(var(--space-3) + env(safe-area-inset-right, 0)));
        padding-top: max(var(--space-2), calc(var(--space-2) + env(safe-area-inset-top, 0)));
    }
    
    .header-title {
        font-size: var(--text-sm);
    }
    
    .header-menu {
        width: 32px;
        height: 32px;
        min-width: 32px;
        min-height: 32px;
    }
    
    .header-profile {
        width: 32px;
        height: 32px;
        min-width: 32px;
        min-height: 32px;
    }
    
    .welcome {
        padding: var(--space-2) max(var(--space-2), calc(var(--space-2) + env(safe-area-inset-left, 0))) var(--space-2) max(var(--space-2), calc(var(--space-2) + env(safe-area-inset-right, 0)));
    }
    
    .welcome-title {
        font-size: clamp(1.1rem, 4vw, 1.25rem);
        padding: 0 var(--space-2);
    }
    
    .welcome-icon {
        width: 50px;
        height: 50px;
    }
    
    .input-container-large {
        padding: 0 max(var(--space-2), calc(var(--space-2) + env(safe-area-inset-left, 0))) 0 max(var(--space-2), calc(var(--space-2) + env(safe-area-inset-right, 0)));
        width: 100%;
        box-sizing: border-box;
    }
    
    .input-box-large {
        padding: var(--space-2);
        width: 100%;
        box-sizing: border-box;
    }
    
    .input-field-large {
        min-height: 44px;
        font-size: 16px; /* Prevent zoom on iOS */
        width: 100%;
        box-sizing: border-box;
    }
    
    .send-btn-large {
        height: 44px;
        min-height: 44px;
    }
    
    .message {
        padding: var(--space-2);
        max-width: 98%;
        box-sizing: border-box;
    }
    
    .message-avatar {
        width: 20px;
        height: 20px;
        min-width: 20px;
        min-height: 20px;
    }
    
    .message-bubble {
        padding: var(--space-2);
        font-size: var(--text-xs);
        word-wrap: break-word;
        overflow-wrap: break-word;
        max-width: 100%;
    }
    
    .input-section {
        padding: var(--space-2) max(var(--space-2), calc(var(--space-2) + env(safe-area-inset-left, 0))) max(var(--space-2), calc(var(--space-2) + env(safe-area-inset-bottom, 0))) max(var(--space-2), calc(var(--space-2) + env(safe-area-inset-right, 0)));
        width: 100%;
        box-sizing: border-box;
    }
    
    .input-box {
        padding: var(--space-2);
        width: 100%;
        box-sizing: border-box;
    }
    
    .send-btn {
        width: 32px;
        height: 32px;
        min-width: 32px;
        min-height: 32px;
    }
    
    .suggestions-horizontal {
        padding: 0 max(var(--space-2), calc(var(--space-2) + env(safe-area-inset-left, 0))) 0 max(var(--space-2), calc(var(--space-2) + env(safe-area-inset-right, 0)));
        width: 100%;
        box-sizing: border-box;
    }
    
    .suggestion-btn {
        padding: var(--space-2);
        font-size: var(--text-xs);
        min-height: 36px;
    }
    
    .messages {
        padding: var(--space-2) max(var(--space-2), calc(var(--space-2) + env(safe-area-inset-left, 0))) var(--space-2) max(var(--space-2), calc(var(--space-2) + env(safe-area-inset-right, 0)));
        width: 100%;
        box-sizing: border-box;
    }
}

/* Landscape Orientation */
@media (max-height: 600px) and (orientation: landscape) {
    .welcome {
        padding: var(--space-4);
        min-height: auto;
    }
    
    .welcome-content {
        gap: var(--space-4);
    }
    
    .welcome-icon {
        width: 60px;
        height: 60px;
        margin-bottom: 0;
    }
    
    .welcome-title {
        font-size: 1.5rem;
    }
    
    .welcome-subtitle {
        display: none;
    }
    
    .input-box-large {
        padding: var(--space-3);
    }
    
    .input-field-large {
        min-height: 40px;
    }
    
    .suggestions-horizontal {
        display: none;
    }
}

/* Welcome Modal Responsive */
@media (max-width: 639px) {
    .welcome-modal-content {
        padding: var(--space-6) var(--space-4);
    }
    
    .welcome-modal-title {
        font-size: var(--text-xl);
    }
    
    .welcome-modal-desc {
        font-size: var(--text-sm);
        margin-bottom: var(--space-6);
    }
    
    .welcome-modal-actions {
        gap: var(--space-2);
        margin-bottom: var(--space-4);
    }
    
    .welcome-modal-btn {
        padding: var(--space-3) var(--space-4);
        font-size: var(--text-sm);
    }
    
    .welcome-modal-disclaimer {
        font-size: 0.625rem;
        margin-top: var(--space-4);
        padding-top: var(--space-4);
    }
}

/* Touch Device Optimizations */
@media (hover: none) and (pointer: coarse) {
    .btn-new,
    .history-item,
    .suggestion-btn,
    .send-btn,
    .send-btn-large,
    .model-selector-large,
    .header-menu,
    .header-profile {
        min-height: 44px;
        min-width: 44px;
    }
    
    .message-actions {
        opacity: 1;
    }
    
    .btn-message-action {
        min-width: 36px;
        min-height: 36px;
    }
}

/* High DPI Displays */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .welcome-icon,
    .message-avatar,
    .logo-img {
        image-rendering: -webkit-optimize-contrast;
        image-rendering: crisp-edges;
    }
}

/* === LOADING SKELETON ANIMATION === */
@keyframes skeleton-pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

.skeleton-text {
    animation: skeleton-pulse 1.5s ease-in-out infinite;
}

/* Profile Loading Spinner */
.profile-loading-spinner {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.profile-loading-spinner svg {
    width: 16px;
    height: 16px;
    color: var(--text-secondary);
}