/* ===========================================
   อัยโนะ (Aino) - Intro/Landing Page
   เข้ากับธีม aichatbot.html
   =========================================== */

/* === CSS VARIABLES (Same as aichatbot.css) === */
: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);
}

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    scroll-behavior: smooth;
    /* Prevent horizontal scroll */
    overflow-x: hidden;
    width: 100%;
    /* 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);
    transition: background-color var(--transition-base), color var(--transition-base);
    overflow-x: hidden;
    width: 100%;
    max-width: 100vw;
    position: relative;
    /* Prevent horizontal scroll */
    min-height: 100vh;
    /* Support for safe areas */
    padding-left: env(safe-area-inset-left);
    padding-right: env(safe-area-inset-right);
}

/* === NAVIGATION === */
.intro-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    border-bottom: 1px solid var(--border-light);
    transition: all var(--transition-base);
    /* Support for safe areas (notch) */
    padding-top: env(safe-area-inset-top, 0);
    padding-left: env(safe-area-inset-left, 0);
    padding-right: env(safe-area-inset-right, 0);
}

[data-theme="dark"] .intro-nav {
    background: rgba(31, 31, 31, 0.95);
    border-bottom-color: var(--border-medium);
}

.intro-nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--space-4) var(--space-6);
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    /* Prevent overflow on mobile */
    padding-left: max(var(--space-4), env(safe-area-inset-left, 0));
    padding-right: max(var(--space-4), env(safe-area-inset-right, 0));
}

.intro-nav-brand {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.intro-nav-logo {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-lg);
    object-fit: cover;
    box-shadow: var(--shadow-sm);
}

.intro-nav-title {
    font-family: var(--font-heading);
    font-size: clamp(var(--text-base), 2.5vw, var(--text-xl));
    font-weight: 700;
    color: var(--text-primary);
    /* Prevent text overflow */
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.intro-nav-btn {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) clamp(var(--space-3), 3vw, var(--space-5));
    background: linear-gradient(135deg, var(--pink-500), var(--pink-600));
    color: white;
    text-decoration: none;
    border-radius: var(--radius-lg);
    font-weight: 600;
    font-size: clamp(var(--text-sm), 2vw, var(--text-base));
    transition: all var(--transition-base);
    box-shadow: 0 4px 12px rgba(236, 72, 153, 0.3);
    white-space: nowrap;
    /* Touch-friendly size */
    min-height: 44px;
}

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

/* === HERO SECTION === */
.intro-hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-16) var(--space-6);
    padding-top: 120px;
    position: relative;
    overflow: hidden;
    /* Support for safe areas */
    padding-left: max(var(--space-4), env(safe-area-inset-left, 0));
    padding-right: max(var(--space-4), env(safe-area-inset-right, 0));
    padding-bottom: max(var(--space-16), env(safe-area-inset-bottom, var(--space-16)));
    width: 100%;
    max-width: 100vw;
}

.intro-hero-background {
    position: absolute;
    inset: 0;
    z-index: -1;
    overflow: hidden;
}

.intro-gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.4;
    animation: intro-float 20s ease-in-out infinite;
}

.orb-1 {
    width: 500px;
    height: 500px;
    background: var(--pink-500);
    top: -150px;
    left: -150px;
    animation-delay: 0s;
}

.orb-2 {
    width: 400px;
    height: 400px;
    background: var(--gray-400);
    bottom: -100px;
    right: -100px;
    animation-delay: 5s;
}

.orb-3 {
    width: 300px;
    height: 300px;
    background: var(--pink-600);
    top: 50%;
    right: 10%;
    animation-delay: 10s;
}

@keyframes intro-float {
    0%, 100% {
        transform: translate(0, 0) scale(1);
    }
    33% {
        transform: translate(50px, -50px) scale(1.1);
    }
    66% {
        transform: translate(-30px, 30px) scale(0.9);
    }
}

.intro-hero-content {
    text-align: center;
    max-width: 900px;
    width: 100%;
    z-index: 1;
    animation: intro-fade-in 1s ease-out;
    padding: 0 var(--space-2);
    /* Prevent overflow */
    box-sizing: border-box;
}

@keyframes intro-fade-in {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.intro-hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    background: rgba(236, 72, 153, 0.1);
    border: 1px solid rgba(236, 72, 153, 0.2);
    border-radius: var(--radius-full);
    color: var(--accent);
    font-size: var(--text-sm);
    font-weight: 600;
    margin-bottom: var(--space-6);
}

.intro-hero-logo {
    width: 150px;
    height: 150px;
    margin: 0 auto var(--space-6);
    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 20px 40px rgba(236, 72, 153, 0.3);
    position: relative;
    animation: intro-logo-float 3s ease-in-out infinite;
}

@keyframes intro-logo-float {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-15px);
    }
}

.intro-hero-logo::after {
    content: '';
    position: absolute;
    inset: -8px;
    border-radius: var(--radius-2xl);
    background: linear-gradient(135deg, var(--pink-500), var(--gray-400));
    opacity: 0.3;
    z-index: -1;
    filter: blur(20px);
}

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

.intro-hero-title {
    font-family: var(--font-heading);
    font-size: clamp(2.5rem, 8vw, 5rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: var(--space-6);
    color: var(--text-primary);
}

.intro-title-line {
    display: block;
}

.intro-gradient-text {
    background: linear-gradient(135deg, var(--pink-500), var(--pink-600));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.intro-hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--text-secondary);
    margin-bottom: var(--space-10);
    line-height: 1.8;
}

.intro-hero-actions {
    display: flex;
    justify-content: center;
    gap: var(--space-4);
    margin-bottom: var(--space-10);
    flex-wrap: wrap;
}

.intro-price-badge {
    display: inline-flex;
    align-items: baseline;
    gap: var(--space-2);
    padding: var(--space-4) var(--space-8);
    background: var(--bg-elevated);
    border: 2px solid var(--accent);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-lg);
}

.intro-price-label {
    font-size: var(--text-sm);
    color: var(--text-secondary);
}

.intro-price-old {
    font-size: var(--text-xl);
    color: var(--text-tertiary);
    text-decoration: line-through;
    margin-right: var(--space-2);
}

.intro-price-amount {
    font-family: var(--font-heading);
    font-size: var(--text-4xl);
    font-weight: 800;
    color: var(--accent);
}

.intro-price-period {
    font-size: var(--text-lg);
    color: var(--text-secondary);
}

/* === BUTTONS === */
.intro-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-4) var(--space-6);
    border-radius: var(--radius-lg);
    font-size: var(--text-base);
    font-weight: 600;
    text-decoration: none;
    transition: all var(--transition-base);
    border: none;
    cursor: pointer;
    touch-action: manipulation;
}

.intro-btn.large {
    padding: var(--space-5) var(--space-8);
    font-size: var(--text-lg);
}

.intro-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);
}

.intro-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);
}

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

.intro-btn-secondary:hover {
    background: var(--bg-hover);
    border-color: var(--border-medium);
    transform: translateY(-2px);
}

/* === SECTIONS === */
.intro-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-6);
    width: 100%;
    /* Prevent overflow on mobile */
    padding-left: max(var(--space-4), env(safe-area-inset-left, 0));
    padding-right: max(var(--space-4), env(safe-area-inset-right, 0));
    box-sizing: border-box;
}

.intro-section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto var(--space-12);
}

.intro-section-title {
    font-family: var(--font-heading);
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    margin-bottom: var(--space-4);
    color: var(--text-primary);
}

.intro-section-subtitle {
    font-size: var(--text-lg);
    color: var(--text-secondary);
}

/* === FEATURES SECTION === */
.intro-features {
    padding: var(--space-16) 0;
    background: var(--bg-elevated);
}

.intro-features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-6);
}

.intro-feature-card {
    padding: var(--space-8);
    background: var(--bg-base);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-xl);
    text-align: center;
    transition: all var(--transition-base);
}

.intro-feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--accent);
}

.intro-feature-icon {
    width: 80px;
    height: 80px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--space-4);
    font-size: var(--text-3xl);
    color: white;
    box-shadow: var(--shadow-md);
}

.intro-feature-icon.pink {
    background: linear-gradient(135deg, var(--pink-500), var(--pink-600));
}

.intro-feature-icon.gray {
    background: linear-gradient(135deg, var(--gray-600), var(--gray-700));
}

.intro-feature-icon.purple {
    background: linear-gradient(135deg, #8b5cf6, #7c3aed);
}

.intro-feature-title {
    font-family: var(--font-heading);
    font-size: var(--text-xl);
    font-weight: 600;
    margin-bottom: var(--space-3);
    color: var(--text-primary);
}

.intro-feature-desc {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* === PRICING SECTION === */
.intro-pricing {
    padding: var(--space-16) 0;
}

.intro-pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-6);
    max-width: 1100px;
    margin: 0 auto;
}

.intro-pricing-card {
    position: relative;
    padding: var(--space-8);
    background: var(--bg-elevated);
    border: 2px solid var(--border-light);
    border-radius: var(--radius-2xl);
    transition: all var(--transition-base);
}

.intro-pricing-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.intro-pricing-card-featured {
    border-color: var(--accent);
    background: linear-gradient(135deg, rgba(236, 72, 153, 0.05), rgba(236, 72, 153, 0.02));
}

.intro-pricing-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    padding: var(--space-1) var(--space-4);
    background: var(--bg-base);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-full);
    font-size: var(--text-xs);
    font-weight: 600;
    color: var(--text-secondary);
}

.intro-pricing-badge.featured {
    background: linear-gradient(135deg, var(--pink-500), var(--pink-600));
    color: white;
    border-color: transparent;
}

.intro-pricing-header {
    text-align: center;
    margin-bottom: var(--space-8);
    padding-top: var(--space-4);
}

.intro-pricing-title {
    font-family: var(--font-heading);
    font-size: var(--text-2xl);
    font-weight: 700;
    margin-bottom: var(--space-4);
    color: var(--text-primary);
}

.intro-pricing-price {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: var(--space-2);
    flex-wrap: wrap;
}

.intro-pricing-old {
    font-size: var(--text-xl);
    color: var(--text-tertiary);
    text-decoration: line-through;
    margin-right: var(--space-1);
}

.intro-pricing-amount {
    font-family: var(--font-heading);
    font-size: var(--text-4xl);
    font-weight: 800;
    color: var(--accent);
}

.intro-pricing-period {
    font-size: var(--text-base);
    color: var(--text-secondary);
}

.intro-pricing-features {
    list-style: none;
    margin-bottom: var(--space-8);
}

.intro-pricing-features li {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) 0;
    color: var(--text-secondary);
}

.intro-pricing-features li i {
    flex-shrink: 0;
}

.intro-pricing-features li i.fa-check {
    color: var(--accent);
}

.intro-pricing-features li i.fa-times {
    color: var(--text-tertiary);
}

.intro-pricing-features .feature-disabled {
    color: var(--text-tertiary);
    opacity: 0.7;
}

.intro-pricing-btn {
    display: block;
    width: 100%;
    padding: var(--space-4) var(--space-6);
    text-align: center;
    background: var(--bg-base);
    border: 2px solid var(--border-light);
    border-radius: var(--radius-lg);
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 600;
    transition: all var(--transition-base);
}

.intro-pricing-btn:hover {
    background: var(--bg-hover);
    border-color: var(--accent);
    transform: translateY(-2px);
}

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

.intro-pricing-btn.primary:hover {
    box-shadow: 0 6px 16px rgba(236, 72, 153, 0.4);
}

/* === CTA SECTION === */
.intro-cta {
    padding: var(--space-16) 0;
    background: linear-gradient(135deg, rgba(236, 72, 153, 0.1), rgba(236, 72, 153, 0.05));
    border-top: 1px solid var(--border-light);
    border-bottom: 1px solid var(--border-light);
}

.intro-cta-content {
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
}

.intro-cta-title {
    font-family: var(--font-heading);
    font-size: clamp(2rem, 4vw, 2.5rem);
    font-weight: 700;
    margin-bottom: var(--space-4);
    color: var(--text-primary);
}

.intro-cta-subtitle {
    font-size: var(--text-lg);
    color: var(--text-secondary);
    margin-bottom: var(--space-8);
}

.intro-cta-actions {
    display: flex;
    justify-content: center;
    gap: var(--space-4);
    flex-wrap: wrap;
}

/* === FOOTER === */
.intro-footer {
    padding: var(--space-12) 0 var(--space-8);
    background: var(--bg-elevated);
    border-top: 1px solid var(--border-light);
}

.intro-footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-8);
    margin-bottom: var(--space-8);
}

.intro-footer-logo {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-lg);
    object-fit: cover;
    margin-bottom: var(--space-4);
}

.intro-footer-brand h3 {
    font-family: var(--font-heading);
    font-size: var(--text-xl);
    margin-bottom: var(--space-2);
    color: var(--text-primary);
}

.intro-footer-brand p {
    color: var(--text-secondary);
}

.intro-footer-links h4,
.intro-footer-contact h4 {
    font-family: var(--font-heading);
    font-size: var(--text-lg);
    margin-bottom: var(--space-4);
    color: var(--text-primary);
}

.intro-footer-links ul,
.intro-footer-contact ul {
    list-style: none;
}

.intro-footer-links li,
.intro-footer-contact li {
    margin-bottom: var(--space-2);
}

.intro-footer-links a,
.intro-footer-contact a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.intro-footer-links a:hover,
.intro-footer-contact a:hover {
    color: var(--accent);
}

.intro-footer-bottom {
    padding-top: var(--space-8);
    border-top: 1px solid var(--border-light);
    text-align: center;
    color: var(--text-secondary);
    font-size: var(--text-sm);
}

/* === RESPONSIVE === */

/* Tablet and below */
@media (max-width: 1024px) {
    .intro-container {
        padding-left: var(--space-4);
        padding-right: var(--space-4);
    }
    
    .intro-features-grid {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: var(--space-4);
    }
    
    .intro-pricing-grid {
        grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
        gap: var(--space-4);
    }
}

/* Mobile Landscape and Portrait */
@media (max-width: 768px) {
    html {
        font-size: 15px;
    }
    
    .intro-nav-container {
        padding: var(--space-3) var(--space-4);
        flex-wrap: wrap;
        gap: var(--space-2);
    }
    
    .intro-nav-brand {
        flex: 1;
        min-width: 0;
    }
    
    .intro-nav-title {
        font-size: var(--text-base);
    }
    
    .intro-nav-btn {
        padding: var(--space-2) var(--space-4);
        font-size: var(--text-sm);
    }
    
    .intro-hero {
        padding: var(--space-8) var(--space-4);
        padding-top: max(80px, calc(60px + env(safe-area-inset-top, 0)));
        min-height: calc(100vh - env(safe-area-inset-top, 0) - env(safe-area-inset-bottom, 0));
    }
    
    .intro-hero-content {
        padding: 0;
    }
    
    .intro-hero-logo {
        width: 100px;
        height: 100px;
        margin-bottom: var(--space-4);
    }
    
    .intro-hero-title {
        font-size: clamp(1.75rem, 8vw, 2.5rem);
        margin-bottom: var(--space-4);
        line-height: 1.2;
    }
    
    .intro-hero-subtitle {
        font-size: clamp(0.875rem, 3vw, 1rem);
        margin-bottom: var(--space-6);
        padding: 0 var(--space-2);
    }
    
    .intro-hero-actions {
        flex-direction: column;
        align-items: stretch;
        gap: var(--space-3);
        padding: 0 var(--space-2);
        margin-bottom: var(--space-6);
    }
    
    .intro-btn {
        justify-content: center;
        width: 100%;
        padding: var(--space-4);
        font-size: var(--text-base);
        min-height: 48px;
    }
    
    .intro-price-badge {
        padding: var(--space-3) var(--space-4);
        flex-wrap: wrap;
        justify-content: center;
        gap: var(--space-1);
    }
    
    .intro-price-amount {
        font-size: var(--text-2xl);
    }
    
    .intro-features {
        padding: var(--space-10) 0;
    }
    
    .intro-features-grid {
        grid-template-columns: 1fr;
        gap: var(--space-4);
        padding: 0 var(--space-2);
    }
    
    .intro-feature-card {
        padding: var(--space-6);
    }
    
    .intro-feature-icon {
        width: 60px;
        height: 60px;
        font-size: var(--text-2xl);
    }
    
    .intro-feature-title {
        font-size: var(--text-lg);
    }
    
    .intro-pricing {
        padding: var(--space-10) 0;
    }
    
    .intro-pricing-grid {
        grid-template-columns: 1fr;
        gap: var(--space-4);
        padding: 0 var(--space-2);
        max-width: 100%;
    }
    
    .intro-pricing-card {
        padding: var(--space-6);
    }
    
    .intro-pricing-amount {
        font-size: var(--text-3xl);
    }
    
    .intro-cta {
        padding: var(--space-10) 0;
    }
    
    .intro-cta-actions {
        flex-direction: column;
        align-items: stretch;
        gap: var(--space-3);
        padding: 0 var(--space-2);
    }
    
    .intro-footer {
        padding: var(--space-8) 0 var(--space-6);
    }
    
    .intro-footer-content {
        grid-template-columns: 1fr;
        gap: var(--space-6);
        padding: 0 var(--space-4);
    }
    
    .intro-section-header {
        padding: 0 var(--space-2);
    }
    
    .intro-section-title {
        font-size: clamp(1.5rem, 6vw, 2rem);
    }
}

/* Small Mobile */
@media (max-width: 480px) {
    html {
        font-size: 14px;
    }
    
    .intro-nav-container {
        padding: var(--space-2) var(--space-3);
    }
    
    .intro-nav-logo {
        width: 32px;
        height: 32px;
    }
    
    .intro-nav-title {
        font-size: var(--text-sm);
    }
    
    .intro-nav-btn span {
        display: none;
    }
    
    .intro-nav-btn {
        padding: var(--space-2);
        min-width: 40px;
        width: 40px;
        height: 40px;
        justify-content: center;
    }
    
    .intro-hero {
        padding: var(--space-6) var(--space-3);
        padding-top: max(70px, calc(50px + env(safe-area-inset-top, 0)));
    }
    
    .intro-hero-logo {
        width: 80px;
        height: 80px;
    }
    
    .intro-hero-title {
        font-size: clamp(1.5rem, 7vw, 2rem);
        margin-bottom: var(--space-3);
    }
    
    .intro-hero-subtitle {
        font-size: clamp(0.8rem, 3vw, 0.9rem);
        margin-bottom: var(--space-4);
    }
    
    .intro-price-badge {
        padding: var(--space-2) var(--space-3);
        font-size: var(--text-xs);
    }
    
    .intro-price-amount {
        font-size: var(--text-xl);
    }
    
    .intro-features-grid {
        padding: 0;
    }
    
    .intro-feature-card {
        padding: var(--space-4);
    }
    
    .intro-feature-icon {
        width: 50px;
        height: 50px;
        font-size: var(--text-xl);
    }
    
    .intro-feature-title {
        font-size: var(--text-base);
    }
    
    .intro-feature-desc {
        font-size: var(--text-sm);
    }
    
    .intro-pricing-grid {
        padding: 0;
    }
    
    .intro-pricing-card {
        padding: var(--space-4);
    }
    
    .intro-pricing-amount {
        font-size: var(--text-2xl);
    }
    
    .intro-section-title {
        font-size: clamp(1.25rem, 5vw, 1.75rem);
    }
    
    .intro-section-subtitle {
        font-size: var(--text-base);
    }
}

/* Very Small Mobile */
@media (max-width: 360px) {
    html {
        font-size: 13px;
    }
    
    .intro-hero-title {
        font-size: 1.5rem;
    }
    
    .intro-hero-subtitle {
        font-size: 0.875rem;
    }
    
    .intro-feature-card {
        padding: var(--space-3);
    }
    
    .intro-pricing-card {
        padding: var(--space-3);
    }
}

/* Landscape Orientation */
@media (max-height: 500px) and (orientation: landscape) {
    .intro-hero {
        padding-top: max(60px, calc(40px + env(safe-area-inset-top, 0)));
        min-height: auto;
        padding-bottom: var(--space-4);
    }
    
    .intro-hero-logo {
        width: 60px;
        height: 60px;
        margin-bottom: var(--space-2);
    }
    
    .intro-hero-title {
        font-size: clamp(1.5rem, 5vw, 2rem);
        margin-bottom: var(--space-2);
    }
    
    .intro-hero-subtitle {
        display: none;
    }
    
    .intro-hero-actions {
        margin-bottom: var(--space-3);
    }
    
    .intro-price-badge {
        display: none;
    }
}

/* === 404 ERROR PAGE === */
.error-404-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-16) var(--space-6);
    padding-top: 120px;
    position: relative;
    overflow: hidden;
}

.error-404-background {
    position: absolute;
    inset: 0;
    z-index: -1;
    overflow: hidden;
}

.error-404-content {
    text-align: center;
    max-width: 700px;
    z-index: 1;
    animation: intro-fade-in 1s ease-out;
}

.error-404-icon {
    font-size: 6rem;
    color: var(--accent);
    margin-bottom: var(--space-6);
    animation: error-pulse 2s ease-in-out infinite;
}

@keyframes error-pulse {
    0%, 100% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.1);
        opacity: 0.8;
    }
}

.error-404-title {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-4);
    margin-bottom: var(--space-6);
}

.error-404-number {
    font-family: var(--font-heading);
    font-size: clamp(6rem, 15vw, 10rem);
    font-weight: 800;
    background: linear-gradient(135deg, var(--pink-500), var(--pink-600));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
}

.error-404-text {
    font-family: var(--font-heading);
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    color: var(--text-primary);
}

.error-404-description {
    font-size: var(--text-lg);
    color: var(--text-secondary);
    margin-bottom: var(--space-8);
    line-height: 1.8;
}

.error-404-actions {
    display: flex;
    justify-content: center;
    gap: var(--space-4);
    flex-wrap: wrap;
    margin-bottom: var(--space-12);
}

.error-404-suggestions {
    margin-top: var(--space-12);
    padding-top: var(--space-8);
    border-top: 1px solid var(--border-light);
}

.error-404-suggestions-title {
    font-family: var(--font-heading);
    font-size: var(--text-xl);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-6);
}

.error-404-links {
    display: flex;
    justify-content: center;
    gap: var(--space-4);
    flex-wrap: wrap;
}

.error-404-link {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-5);
    background: var(--bg-elevated);
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-light);
    transition: all var(--transition-base);
    font-weight: 500;
}

.error-404-link:hover {
    background: var(--bg-hover);
    color: var(--accent);
    border-color: var(--accent);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.error-404-link i {
    font-size: var(--text-lg);
}

/* === RESPONSIVE 404 === */
@media (max-width: 768px) {
    .error-404-section {
        padding: var(--space-12) var(--space-4);
        padding-top: 100px;
    }
    
    .error-404-icon {
        font-size: 4rem;
    }
    
    .error-404-actions {
        flex-direction: column;
        align-items: stretch;
    }
    
    .error-404-links {
        flex-direction: column;
        align-items: stretch;
    }
    
    .error-404-link {
        justify-content: center;
    }
}

/* === SMOOTH SCROLL === */
html {
    scroll-behavior: smooth;
}

/* === ANIMATION ON SCROLL === */
@media (prefers-reduced-motion: no-preference) {
    .intro-feature-card,
    .intro-pricing-card {
        opacity: 0;
        transform: translateY(30px);
        animation: intro-fade-up 0.6s ease-out forwards;
    }
    
    .intro-feature-card:nth-child(1) { animation-delay: 0.1s; }
    .intro-feature-card:nth-child(2) { animation-delay: 0.2s; }
    .intro-feature-card:nth-child(3) { animation-delay: 0.3s; }
    .intro-feature-card:nth-child(4) { animation-delay: 0.4s; }
    .intro-feature-card:nth-child(5) { animation-delay: 0.5s; }
    .intro-feature-card:nth-child(6) { animation-delay: 0.6s; }
    
    .intro-pricing-card:nth-child(1) { animation-delay: 0.1s; }
    .intro-pricing-card:nth-child(2) { animation-delay: 0.2s; }
    .intro-pricing-card:nth-child(3) { animation-delay: 0.3s; }
}

@keyframes intro-fade-up {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}