/* ============================================
   MedFlash Website - Ultra Modern Redesign
   Premium Medical Landing Page
   Glassmorphism + Gradients + Animations
   ============================================ */

/* ============================================
   CSS Custom Properties (Dark Mode Ready)
   ============================================ */

:root {
    /* Primary Colors - Medical Teal/Cyan/Blue */
    --primary-50: #ecfeff;
    --primary-100: #cffafe;
    --primary-200: #a5f3fc;
    --primary-300: #67e8f9;
    --primary-400: #22d3ee;
    --primary-500: #06b6d4;
    --primary-600: #0891b2;
    --primary-700: #0e7490;
    --primary-800: #155e75;
    --primary-900: #164e63;

    /* Secondary Colors */
    --secondary-400: #38bdf8;
    --secondary-500: #0ea5e9;
    --secondary-600: #0284c7;

    /* Accent Colors */
    --accent-400: #818cf8;
    --accent-500: #6366f1;
    --accent-600: #4f46e5;

    /* Status Colors */
    --success-400: #4ade80;
    --success-500: #22c55e;
    --success-600: #16a34a;

    --warning-400: #fbbf24;
    --warning-500: #f59e0b;
    --warning-600: #d97706;

    --error-400: #f87171;
    --error-500: #ef4444;
    --error-600: #dc2626;

    /* Neutral Colors */
    --slate-50: #f8fafc;
    --slate-100: #f1f5f9;
    --slate-200: #e2e8f0;
    --slate-300: #cbd5e1;
    --slate-400: #94a3b8;
    --slate-500: #64748b;
    --slate-600: #475569;
    --slate-700: #334155;
    --slate-800: #1e293b;
    --slate-900: #0f172a;
    --slate-950: #020617;

    /* Semantic Colors */
    --text-primary: var(--slate-900);
    --text-secondary: var(--slate-600);
    --text-muted: var(--slate-400);
    --text-inverse: #ffffff;

    --bg-primary: #ffffff;
    --bg-secondary: var(--slate-50);
    --bg-tertiary: var(--primary-50);
    --bg-dark: var(--slate-900);
    --bg-darker: var(--slate-950);

    --border-light: var(--slate-200);
    --border-medium: var(--slate-300);
    --border-primary: var(--primary-200);

    /* Glassmorphism */
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-bg-strong: rgba(255, 255, 255, 0.85);
    --glass-border: rgba(255, 255, 255, 0.3);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #0891b2 0%, #06b6d4 50%, #22d3ee 100%);
    --gradient-secondary: linear-gradient(135deg, #0ea5e9 0%, #38bdf8 100%);
    --gradient-accent: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    --gradient-hero: linear-gradient(135deg, #0c4a6e 0%, #0891b2 50%, #06b6d4 100%);
    --gradient-hero-light: linear-gradient(180deg, #ecfeff 0%, #cffafe 50%, #ffffff 100%);
    --gradient-dark: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    --gradient-mesh: radial-gradient(at 40% 20%, hsla(180, 80%, 70%, 0.3) 0px, transparent 50%),
                     radial-gradient(at 80% 0%, hsla(189, 100%, 56%, 0.2) 0px, transparent 50%),
                     radial-gradient(at 0% 50%, hsla(187, 85%, 53%, 0.15) 0px, transparent 50%),
                     radial-gradient(at 80% 50%, hsla(197, 100%, 50%, 0.15) 0px, transparent 50%),
                     radial-gradient(at 0% 100%, hsla(180, 80%, 60%, 0.15) 0px, transparent 50%);
    --gradient-text: linear-gradient(135deg, #0891b2 0%, #06b6d4 40%, #22d3ee 70%, #67e8f9 100%);
    --gradient-glow: linear-gradient(135deg, rgba(8, 145, 178, 0.4) 0%, rgba(6, 182, 212, 0.3) 100%);

    /* Shadows */
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --shadow-glow: 0 0 40px rgba(6, 182, 212, 0.3);
    --shadow-glow-lg: 0 0 60px rgba(6, 182, 212, 0.4);
    --shadow-primary: 0 4px 14px rgba(8, 145, 178, 0.4);
    --shadow-primary-lg: 0 8px 25px rgba(8, 145, 178, 0.35);

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-2xl: 32px;
    --radius-full: 9999px;

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);

    /* Z-index Scale */
    --z-base: 0;
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-fixed: 300;
    --z-modal-backdrop: 400;
    --z-modal: 500;
    --z-popover: 600;
    --z-tooltip: 700;
}

/* Dark Mode Variables */
@media (prefers-color-scheme: dark) {
    :root.auto-dark {
        --text-primary: var(--slate-100);
        --text-secondary: var(--slate-300);
        --text-muted: var(--slate-500);

        --bg-primary: var(--slate-900);
        --bg-secondary: var(--slate-800);
        --bg-tertiary: var(--slate-700);

        --border-light: var(--slate-700);
        --border-medium: var(--slate-600);

        --glass-bg: rgba(30, 41, 59, 0.7);
        --glass-bg-strong: rgba(30, 41, 59, 0.85);
        --glass-border: rgba(255, 255, 255, 0.1);
    }
}

/* ============================================
   Reset & Base Styles
   ============================================ */

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-primary);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

img, video {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: inherit;
    text-decoration: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

ul, ol {
    list-style: none;
}

/* ============================================
   Layout & Container
   ============================================ */

.container {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}

@media (min-width: 640px) {
    .container {
        padding: 0 32px;
    }
}

@media (min-width: 1024px) {
    .container {
        padding: 0 48px;
    }
}

/* ============================================
   Typography
   ============================================ */

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

h1 {
    font-size: clamp(2.5rem, 5vw + 1rem, 4.5rem);
    font-weight: 800;
    letter-spacing: -0.03em;
}

h2 {
    font-size: clamp(2rem, 4vw + 0.5rem, 3.5rem);
    font-weight: 700;
}

h3 {
    font-size: clamp(1.25rem, 2vw + 0.25rem, 1.75rem);
}

h4 {
    font-size: 1.25rem;
}

p {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* Gradient Text */
.gradient-text {
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    background-size: 200% auto;
    animation: gradientShift 4s ease-in-out infinite;
}

@keyframes gradientShift {
    0%, 100% { background-position: 0% center; }
    50% { background-position: 100% center; }
}

/* ============================================
   Buttons
   ============================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 14px 28px;
    font-size: 1rem;
    font-weight: 600;
    line-height: 1.5;
    border-radius: var(--radius-lg);
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
    white-space: nowrap;
}

.btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(rgba(255, 255, 255, 0.2), rgba(255, 255, 255, 0) 50%);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.btn:hover::before {
    opacity: 1;
}

/* Primary Button */
.btn-primary {
    background: var(--gradient-primary);
    color: var(--text-inverse);
    box-shadow: var(--shadow-md), var(--shadow-primary);
}

.btn-primary:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: var(--shadow-lg), var(--shadow-primary-lg);
}

.btn-primary:active {
    transform: translateY(-1px) scale(1.01);
}

/* Primary Button Pulse Animation */
.btn-primary.pulse {
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        box-shadow: var(--shadow-md), var(--shadow-primary);
    }
    50% {
        box-shadow: var(--shadow-lg), 0 0 30px rgba(6, 182, 212, 0.5), 0 0 60px rgba(6, 182, 212, 0.3);
    }
}

/* Secondary Button - Glassmorphism */
.btn-secondary {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    color: var(--text-primary);
    border: 1px solid var(--border-light);
    box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
    background: var(--glass-bg-strong);
    border-color: var(--primary-400);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Large Button */
.btn-large {
    padding: 18px 36px;
    font-size: 1.1rem;
    border-radius: var(--radius-xl);
}

/* ============================================
   Navigation - Glassmorphism
   ============================================ */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: var(--z-fixed);
    background: var(--glass-bg);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--glass-border);
    transition: all var(--transition-base);
}

.navbar.scrolled {
    background: var(--glass-bg-strong);
    box-shadow: var(--shadow-lg);
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 800;
    font-size: 1.5rem;
    color: var(--text-primary);
    transition: transform var(--transition-fast);
}

.logo:hover {
    transform: scale(1.02);
}

.logo-icon {
    font-size: 2rem;
    filter: drop-shadow(0 2px 4px rgba(6, 182, 212, 0.3));
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 36px;
}

.nav-links a {
    font-weight: 500;
    font-size: 0.95rem;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
    position: relative;
    padding: 8px 0;
}

.nav-links a:not(.btn)::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    transition: width var(--transition-base);
}

.nav-links a:not(.btn):hover {
    color: var(--primary-600);
}

.nav-links a:not(.btn):hover::after {
    width: 100%;
}

.nav-links .btn {
    padding: 10px 24px;
}

/* Mobile Menu Button */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 6px;
    padding: 8px;
    z-index: 10;
}

.mobile-menu-btn span {
    width: 28px;
    height: 2.5px;
    background: var(--text-primary);
    border-radius: var(--radius-full);
    transition: all var(--transition-base);
    transform-origin: center;
}

/* ============================================
   Hero Section
   ============================================ */

.hero {
    position: relative;
    min-height: 100vh;
    padding: 140px 0 100px;
    overflow: hidden;
    background: var(--gradient-hero-light);
}

/* Animated Background Mesh */
.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--gradient-mesh);
    opacity: 1;
    animation: meshMove 20s ease-in-out infinite;
}

@keyframes meshMove {
    0%, 100% {
        transform: translateX(0) translateY(0);
        opacity: 1;
    }
    25% {
        transform: translateX(2%) translateY(-2%);
    }
    50% {
        transform: translateX(-1%) translateY(2%);
        opacity: 0.8;
    }
    75% {
        transform: translateX(1%) translateY(-1%);
    }
}

/* Medical Pattern Overlay */
.hero::after {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        radial-gradient(circle at 20% 30%, rgba(6, 182, 212, 0.08) 0%, transparent 40%),
        radial-gradient(circle at 80% 70%, rgba(14, 165, 233, 0.08) 0%, transparent 40%),
        radial-gradient(circle at 50% 50%, rgba(99, 102, 241, 0.05) 0%, transparent 50%);
    pointer-events: none;
}

/* Hero Background Decoration */
.hero-bg {
    position: absolute;
    inset: 0;
    overflow: hidden;
    pointer-events: none;
}

.hero-bg::before {
    content: '';
    position: absolute;
    top: -20%;
    right: -10%;
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(6, 182, 212, 0.15) 0%, transparent 70%);
    animation: float 15s ease-in-out infinite;
}

.hero-bg::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(14, 165, 233, 0.12) 0%, transparent 70%);
    animation: float 18s ease-in-out infinite reverse;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(30px, -30px) scale(1.05); }
    66% { transform: translate(-20px, 20px) scale(0.95); }
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-content {
    animation: fadeInUp 0.8s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Hero Badge */
.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: var(--glass-bg-strong);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    padding: 12px 24px;
    border-radius: var(--radius-full);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 32px;
    border: 1px solid var(--glass-border);
    box-shadow: var(--shadow-sm);
    animation: fadeInUp 0.8s ease-out 0.1s both;
}

.hero-subtitle {
    font-size: clamp(1.1rem, 2vw, 1.35rem);
    color: var(--text-secondary);
    margin: 28px 0 32px;
    max-width: 560px;
    line-height: 1.8;
    animation: fadeInUp 0.8s ease-out 0.2s both;
}

.hero-subtitle strong {
    color: var(--primary-600);
    font-weight: 600;
}

/* Hero Value Props */
.hero-value-prop {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 36px;
    animation: fadeInUp 0.8s ease-out 0.3s both;
}

.value-tag {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--glass-bg);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    padding: 10px 18px;
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--primary-700);
    border: 1px solid var(--border-primary);
    transition: all var(--transition-base);
}

.value-tag:hover {
    background: var(--primary-50);
    border-color: var(--primary-400);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

/* Hero CTA */
.hero-cta {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 56px;
    animation: fadeInUp 0.8s ease-out 0.4s both;
}

/* Hero Stats */
.hero-stats {
    display: flex;
    gap: 48px;
    animation: fadeInUp 0.8s ease-out 0.5s both;
}

.stat {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.stat-value {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.1;
}

.stat-label {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Hero Image & Phone Mockup */
.hero-image {
    display: flex;
    justify-content: center;
    position: relative;
    animation: fadeInUp 0.8s ease-out 0.3s both;
}

.phone-mockup {
    width: 320px;
    height: 660px;
    background: linear-gradient(145deg, var(--slate-800) 0%, var(--slate-900) 100%);
    border-radius: 48px;
    padding: 12px;
    position: relative;
    transform: perspective(1200px) rotateY(-8deg) rotateX(3deg);
    transition: transform var(--transition-slow);
    animation: phoneFloat 6s ease-in-out infinite;
    box-shadow:
        var(--shadow-2xl),
        0 0 0 1px rgba(255, 255, 255, 0.1),
        inset 0 0 0 1px rgba(255, 255, 255, 0.05);
}

/* Phone Glow Effect */
.phone-mockup::before {
    content: '';
    position: absolute;
    inset: -20px;
    background: radial-gradient(ellipse at center, rgba(6, 182, 212, 0.2) 0%, transparent 70%);
    border-radius: 60px;
    z-index: -1;
    opacity: 0.8;
    animation: glowPulse 4s ease-in-out infinite;
}

@keyframes glowPulse {
    0%, 100% {
        opacity: 0.6;
        transform: scale(1);
    }
    50% {
        opacity: 1;
        transform: scale(1.05);
    }
}

@keyframes phoneFloat {
    0%, 100% {
        transform: perspective(1200px) rotateY(-8deg) rotateX(3deg) translateY(0);
    }
    50% {
        transform: perspective(1200px) rotateY(-8deg) rotateX(3deg) translateY(-15px);
    }
}

.phone-mockup:hover {
    transform: perspective(1200px) rotateY(0deg) rotateX(0deg);
    animation-play-state: paused;
}

/* Phone Notch */
.phone-mockup::after {
    content: '';
    position: absolute;
    top: 12px;
    left: 50%;
    transform: translateX(-50%);
    width: 110px;
    height: 32px;
    background: var(--slate-900);
    border-radius: 0 0 20px 20px;
    z-index: 10;
}

.phone-screen {
    width: 100%;
    height: 100%;
    background: var(--bg-primary);
    border-radius: 40px;
    overflow: hidden;
    position: relative;
}

.app-preview {
    padding: 56px 20px 20px;
    height: 100%;
}

.preview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    font-weight: 700;
    font-size: 1.1rem;
}

.preview-count {
    background: var(--gradient-primary);
    color: var(--text-inverse);
    padding: 6px 14px;
    border-radius: var(--radius-full);
    font-size: 0.8rem;
    font-weight: 600;
}

.preview-card {
    background: linear-gradient(135deg, var(--slate-50) 0%, var(--primary-50) 100%);
    border-radius: var(--radius-lg);
    padding: 24px;
    margin-bottom: 20px;
    border: 1px solid var(--border-primary);
    box-shadow: var(--shadow-sm);
}

.preview-question {
    font-weight: 600;
    margin-bottom: 16px;
    font-size: 0.95rem;
    line-height: 1.5;
    color: var(--text-primary);
}

.preview-answer {
    color: var(--primary-600);
    font-weight: 600;
    font-size: 0.9rem;
}

.preview-buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
}

.preview-btn {
    padding: 12px 6px;
    border-radius: var(--radius-md);
    text-align: center;
    font-size: 0.7rem;
    font-weight: 700;
    color: var(--text-inverse);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.preview-btn.again { background: linear-gradient(135deg, #f87171, #ef4444); }
.preview-btn.hard { background: linear-gradient(135deg, #fbbf24, #f59e0b); }
.preview-btn.good { background: linear-gradient(135deg, #4ade80, #22c55e); }
.preview-btn.easy { background: linear-gradient(135deg, #22d3ee, #06b6d4); }

/* ============================================
   Section Headers
   ============================================ */

.section-header {
    text-align: center;
    max-width: 720px;
    margin: 0 auto 72px;
}

.section-header h2 {
    margin-bottom: 20px;
}

.section-header p {
    font-size: 1.2rem;
    line-height: 1.8;
}

/* ============================================
   Difficulty Levels Section
   ============================================ */

.difficulty-levels {
    padding: 120px 0;
    background: var(--bg-primary);
    position: relative;
}

.difficulty-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.difficulty-card {
    background: var(--glass-bg-strong);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-2xl);
    padding: 40px 32px;
    text-align: center;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.difficulty-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    transition: height var(--transition-base);
}

.difficulty-card.beginner::before {
    background: linear-gradient(90deg, #10b981, #34d399, #6ee7b7);
}

.difficulty-card.intermediate::before {
    background: linear-gradient(90deg, #f59e0b, #fbbf24, #fcd34d);
}

.difficulty-card.advanced::before {
    background: linear-gradient(90deg, #8b5cf6, #a78bfa, #c4b5fd);
}

.difficulty-card:hover {
    transform: translateY(-12px);
    box-shadow: var(--shadow-xl);
    border-color: transparent;
}

.difficulty-card:hover::before {
    height: 6px;
}

.difficulty-card.beginner:hover {
    box-shadow: var(--shadow-xl), 0 8px 30px rgba(16, 185, 129, 0.2);
}

.difficulty-card.intermediate:hover {
    box-shadow: var(--shadow-xl), 0 8px 30px rgba(245, 158, 11, 0.2);
}

.difficulty-card.advanced:hover {
    box-shadow: var(--shadow-xl), 0 8px 30px rgba(139, 92, 246, 0.2);
}

.difficulty-icon {
    font-size: 3.5rem;
    margin-bottom: 16px;
    display: block;
    filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.1));
}

.difficulty-badge {
    display: inline-block;
    padding: 8px 20px;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: 20px;
}

.difficulty-card.beginner .difficulty-badge {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.15), rgba(52, 211, 153, 0.15));
    color: #059669;
}

.difficulty-card.intermediate .difficulty-badge {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.15), rgba(251, 191, 36, 0.15));
    color: #d97706;
}

.difficulty-card.advanced .difficulty-badge {
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.15), rgba(167, 139, 250, 0.15));
    color: #7c3aed;
}

.difficulty-card h3 {
    font-size: 1.25rem;
    margin-bottom: 14px;
}

.difficulty-card > p {
    font-size: 0.95rem;
    line-height: 1.7;
    margin-bottom: 28px;
}

.difficulty-features {
    text-align: left;
}

.difficulty-features li {
    padding: 12px 0;
    font-size: 0.9rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 12px;
    border-bottom: 1px solid var(--border-light);
}

.difficulty-features li:last-child {
    border-bottom: none;
}

.difficulty-features li::before {
    content: '\2713';
    font-weight: 700;
    font-size: 0.85rem;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
    flex-shrink: 0;
}

.difficulty-card.beginner .difficulty-features li::before {
    color: #10b981;
    background: rgba(16, 185, 129, 0.1);
}

.difficulty-card.intermediate .difficulty-features li::before {
    color: #f59e0b;
    background: rgba(245, 158, 11, 0.1);
}

.difficulty-card.advanced .difficulty-features li::before {
    color: #8b5cf6;
    background: rgba(139, 92, 246, 0.1);
}

/* ============================================
   Curriculum Coverage Section
   ============================================ */

.curriculum-coverage {
    padding: 100px 0;
    background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
}

.curriculum-grid {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 20px;
}

.curriculum-item {
    background: var(--glass-bg-strong);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    padding: 28px 36px;
    text-align: center;
    min-width: 200px;
    transition: all var(--transition-base);
}

.curriculum-item:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    border-color: var(--primary-300);
}

.curriculum-icon {
    font-size: 2rem;
    margin-bottom: 12px;
    display: block;
}

.curriculum-item h4 {
    font-size: 1rem;
    margin-bottom: 6px;
    color: var(--text-primary);
}

.curriculum-item p {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* ============================================
   Features Section
   ============================================ */

.features {
    padding: 120px 0;
    background: var(--bg-secondary);
    position: relative;
    overflow: hidden;
}

.features::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-primary), transparent);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.feature-card {
    background: var(--glass-bg-strong);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    padding: 36px 28px;
    border-radius: var(--radius-xl);
    border: 1px solid var(--glass-border);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

/* Gradient Accent Line */
.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-base);
}

/* Hover Glow */
.feature-card::after {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at center, rgba(6, 182, 212, 0.05) 0%, transparent 70%);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.feature-card:hover {
    transform: translateY(-10px) scale(1.02);
    box-shadow: var(--shadow-xl), var(--shadow-glow);
    border-color: var(--primary-200);
}

.feature-card:hover::before {
    transform: scaleX(1);
}

.feature-card:hover::after {
    opacity: 1;
}

.feature-icon {
    font-size: 2.75rem;
    margin-bottom: 20px;
    display: block;
    position: relative;
    z-index: 1;
    filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.1));
}

.feature-card h3 {
    margin-bottom: 12px;
    font-size: 1.1rem;
    position: relative;
    z-index: 1;
}

.feature-card p {
    font-size: 0.9rem;
    line-height: 1.7;
    position: relative;
    z-index: 1;
}

/* ============================================
   Decks Section
   ============================================ */

.decks {
    padding: 120px 0;
    position: relative;
}

.decks-tier {
    margin-bottom: 64px;
}

.decks-tier:last-child {
    margin-bottom: 0;
}

.tier-title {
    display: flex;
    align-items: center;
    gap: 16px;
    font-size: 1.5rem;
    margin-bottom: 36px;
}

.tier-badge {
    padding: 8px 20px;
    border-radius: var(--radius-full);
    font-size: 0.7rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 1.5px;
}

.tier-badge.free {
    background: linear-gradient(135deg, #10b981, #34d399);
    color: var(--text-inverse);
    box-shadow: 0 4px 14px rgba(16, 185, 129, 0.3);
}

.tier-badge.pro {
    background: var(--gradient-primary);
    color: var(--text-inverse);
    box-shadow: var(--shadow-primary);
}

.decks-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 24px;
}

.deck-card {
    background: var(--glass-bg-strong);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    padding: 32px;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.deck-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--deck-color);
}

.deck-card:hover {
    transform: translateY(-8px) scale(1.01);
    border-color: var(--deck-color);
    box-shadow: var(--shadow-xl);
}

.deck-card.premium {
    background: linear-gradient(135deg, rgba(8, 145, 178, 0.05) 0%, rgba(14, 165, 233, 0.05) 100%);
    border-color: rgba(8, 145, 178, 0.2);
}

.deck-card.premium::before {
    background: var(--gradient-primary);
}

.deck-badge {
    position: absolute;
    top: 20px;
    right: 20px;
    background: var(--gradient-primary);
    color: var(--text-inverse);
    padding: 5px 14px;
    border-radius: var(--radius-full);
    font-size: 0.65rem;
    font-weight: 800;
    letter-spacing: 1px;
    box-shadow: var(--shadow-sm);
}

.deck-icon {
    font-size: 3rem;
    margin-bottom: 20px;
    display: block;
    filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.1));
}

.deck-card h3 {
    margin-bottom: 10px;
    font-size: 1.3rem;
}

.deck-card p {
    font-size: 0.9rem;
    line-height: 1.6;
    margin-bottom: 16px;
}

.deck-count {
    display: inline-block;
    padding: 8px 16px;
    background: linear-gradient(135deg, var(--slate-100), var(--primary-50));
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--primary-700);
}

/* ============================================
   How It Works Section
   ============================================ */

.how-it-works {
    padding: 120px 0;
    background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-tertiary) 50%, var(--bg-secondary) 100%);
}

.steps {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 48px;
    position: relative;
}

/* Connecting Line */
.steps::before {
    content: '';
    position: absolute;
    top: 40px;
    left: 15%;
    right: 15%;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-200), var(--primary-400), var(--primary-200));
    border-radius: var(--radius-full);
    z-index: 0;
}

.step {
    text-align: center;
    position: relative;
    z-index: 1;
}

.step-number {
    width: 80px;
    height: 80px;
    background: var(--gradient-primary);
    color: var(--text-inverse);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    font-weight: 800;
    margin: 0 auto 28px;
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    position: relative;
    transition: all var(--transition-base);
}

.step-number::before {
    content: '';
    position: absolute;
    inset: -4px;
    border-radius: 50%;
    background: var(--gradient-primary);
    opacity: 0.3;
    z-index: -1;
    animation: stepPulse 3s ease-in-out infinite;
}

@keyframes stepPulse {
    0%, 100% { transform: scale(1); opacity: 0.3; }
    50% { transform: scale(1.15); opacity: 0.1; }
}

.step:hover .step-number {
    transform: scale(1.1);
    box-shadow: var(--shadow-xl), var(--shadow-glow-lg);
}

.step h3 {
    margin-bottom: 14px;
    font-size: 1.25rem;
}

.step p {
    font-size: 0.95rem;
    line-height: 1.7;
    max-width: 280px;
    margin: 0 auto;
}

/* ============================================
   Pricing Section
   ============================================ */

.pricing {
    padding: 120px 0;
    background: var(--bg-primary);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
    max-width: 1100px;
    margin: 0 auto;
    align-items: start;
}

.pricing-card {
    background: var(--glass-bg-strong);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-2xl);
    padding: 44px 36px;
    text-align: center;
    position: relative;
    transition: all var(--transition-base);
}

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

/* Featured Card - Best Value */
.pricing-card.featured {
    background: var(--gradient-dark);
    border: 2px solid transparent;
    color: var(--text-inverse);
    transform: scale(1.05);
    box-shadow: var(--shadow-2xl);
    position: relative;
    z-index: 2;
}

/* Glowing Border Effect */
.pricing-card.featured::before {
    content: '';
    position: absolute;
    inset: -2px;
    background: var(--gradient-primary);
    border-radius: calc(var(--radius-2xl) + 2px);
    z-index: -1;
    opacity: 0.8;
    animation: borderGlow 3s ease-in-out infinite;
}

@keyframes borderGlow {
    0%, 100% {
        opacity: 0.6;
        filter: blur(0px);
    }
    50% {
        opacity: 1;
        filter: blur(2px);
    }
}

.pricing-card.featured::after {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--gradient-dark);
    border-radius: var(--radius-2xl);
    z-index: -1;
}

.pricing-card.featured:hover {
    transform: scale(1.05) translateY(-8px);
}

.pricing-card.featured h3,
.pricing-card.featured .price {
    color: var(--text-inverse);
}

.pricing-card.featured p {
    color: rgba(255, 255, 255, 0.7);
}

.pricing-card.featured .pricing-features li {
    color: rgba(255, 255, 255, 0.9);
    border-color: rgba(255, 255, 255, 0.1);
}

.pricing-badge {
    position: absolute;
    top: -16px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--gradient-primary);
    color: var(--text-inverse);
    padding: 10px 28px;
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    font-weight: 700;
    white-space: nowrap;
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    animation: badgePulse 2s ease-in-out infinite;
}

@keyframes badgePulse {
    0%, 100% { box-shadow: var(--shadow-lg), var(--shadow-glow); }
    50% { box-shadow: var(--shadow-xl), 0 0 30px rgba(6, 182, 212, 0.5); }
}

.pricing-header h3 {
    font-size: 1.4rem;
    margin-bottom: 12px;
}

.price {
    font-size: 4rem;
    font-weight: 800;
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
}

.pricing-card.featured .price {
    background: linear-gradient(135deg, #67e8f9, #22d3ee, #06b6d4);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.price span {
    font-size: 1rem;
    font-weight: 500;
    -webkit-text-fill-color: var(--text-secondary);
}

.pricing-card.featured .price span {
    -webkit-text-fill-color: rgba(255, 255, 255, 0.6);
}

.pricing-header p {
    margin-top: 8px;
    margin-bottom: 32px;
    font-size: 0.95rem;
}

.pricing-features {
    text-align: left;
    margin-bottom: 36px;
}

.pricing-features li {
    padding: 14px 0;
    border-bottom: 1px solid var(--border-light);
    color: var(--text-secondary);
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: 12px;
}

.pricing-features li:last-child {
    border-bottom: none;
}

.pricing-features li::before {
    content: '\2713';
    color: var(--success-500);
    font-weight: 700;
    font-size: 0.9rem;
}

.pricing-card .btn {
    width: 100%;
}

.pricing-card.featured .btn-primary {
    background: linear-gradient(135deg, #ffffff, #f1f5f9);
    color: var(--text-primary);
    box-shadow: var(--shadow-lg);
}

.pricing-card.featured .btn-primary:hover {
    background: #ffffff;
    transform: translateY(-2px);
}

.pricing-note {
    text-align: center;
    margin-top: 56px;
    padding: 28px 36px;
    background: linear-gradient(135deg, rgba(6, 182, 212, 0.08) 0%, rgba(14, 165, 233, 0.08) 100%);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-primary);
    max-width: 720px;
    margin-left: auto;
    margin-right: auto;
}

.pricing-note p {
    font-size: 1.05rem;
}

.pricing-note strong {
    color: var(--primary-600);
}

/* ============================================
   Testimonials Section
   ============================================ */

.testimonials {
    padding: 120px 0;
    background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
    overflow: hidden;
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.testimonial-card {
    background: var(--glass-bg-strong);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    padding: 32px;
    border-radius: var(--radius-xl);
    border: 1px solid var(--glass-border);
    transition: all var(--transition-base);
    position: relative;
}

/* Quote Decoration */
.testimonial-card::before {
    content: '"';
    position: absolute;
    top: 20px;
    right: 24px;
    font-size: 4rem;
    font-weight: 800;
    color: var(--primary-100);
    line-height: 1;
    font-family: Georgia, serif;
}

.testimonial-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl), var(--shadow-glow);
    border-color: var(--primary-200);
}

.testimonial-stars {
    color: #fbbf24;
    font-size: 1.2rem;
    margin-bottom: 16px;
    letter-spacing: 4px;
}

.testimonial-card > p {
    font-style: italic;
    margin-bottom: 24px;
    font-size: 0.95rem;
    line-height: 1.8;
    position: relative;
    z-index: 1;
}

.testimonial-author {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding-top: 16px;
    border-top: 1px solid var(--border-light);
}

.testimonial-author strong {
    color: var(--text-primary);
    font-size: 1rem;
}

.testimonial-author span {
    font-size: 0.8rem;
    color: var(--primary-600);
    font-weight: 500;
}

/* ============================================
   Trust Section
   ============================================ */

.trust-section {
    padding: 80px 0;
    background: linear-gradient(135deg, var(--primary-50) 0%, var(--slate-50) 100%);
}

.trust-content {
    text-align: center;
}

.trust-content h3 {
    font-size: 1.75rem;
    margin-bottom: 48px;
}

.trust-stats {
    display: flex;
    justify-content: center;
    gap: 80px;
    margin-bottom: 36px;
}

.trust-stat {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.trust-number {
    font-size: 3.5rem;
    font-weight: 800;
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.1;
}

.trust-label {
    font-size: 1rem;
    color: var(--text-secondary);
    font-weight: 500;
    margin-top: 4px;
}

.trust-subtext {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ============================================
   Download Section
   ============================================ */

.download {
    padding: 140px 0;
    background: var(--gradient-dark);
    text-align: center;
    position: relative;
    overflow: hidden;
}

/* Animated Background */
.download::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse at 20% 30%, rgba(6, 182, 212, 0.2) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 70%, rgba(14, 165, 233, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 0%, rgba(99, 102, 241, 0.1) 0%, transparent 50%);
    animation: downloadBg 10s ease-in-out infinite;
}

@keyframes downloadBg {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.7; transform: scale(1.1); }
}

.download-content {
    position: relative;
    z-index: 1;
}

.download-content h2 {
    color: var(--text-inverse);
    margin-bottom: 20px;
}

.download-content p {
    color: rgba(255, 255, 255, 0.8);
    font-size: 1.3rem;
    margin-bottom: 48px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.download-badges {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

.app-store-badge img {
    height: 65px;
    transition: all var(--transition-base);
    filter: drop-shadow(0 4px 12px rgba(0, 0, 0, 0.3));
}

.app-store-badge:hover img {
    transform: scale(1.08) translateY(-4px);
    filter: drop-shadow(0 8px 20px rgba(0, 0, 0, 0.4));
}

.download-note {
    margin-top: 32px;
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.5);
}

/* ============================================
   Footer
   ============================================ */

.footer {
    padding: 100px 0 50px;
    background: var(--gradient-dark);
    color: var(--text-inverse);
    position: relative;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(6, 182, 212, 0.3), transparent);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 64px;
    margin-bottom: 64px;
}

.footer-brand p {
    color: rgba(255, 255, 255, 0.5);
    margin-top: 20px;
    font-size: 0.95rem;
    line-height: 1.7;
    max-width: 300px;
}

.footer-brand .logo {
    color: var(--text-inverse);
}

.footer-links h4 {
    margin-bottom: 24px;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: rgba(255, 255, 255, 0.4);
    font-weight: 600;
}

.footer-links a {
    display: block;
    color: rgba(255, 255, 255, 0.7);
    padding: 10px 0;
    font-size: 0.95rem;
    transition: all var(--transition-fast);
}

.footer-links a:hover {
    color: var(--primary-300);
    transform: translateX(4px);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 40px;
    display: flex;
    justify-content: space-between;
    color: rgba(255, 255, 255, 0.4);
    font-size: 0.9rem;
}

/* ============================================
   Scroll Animations
   ============================================ */

.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

.fade-in-left {
    opacity: 0;
    transform: translateX(-30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in-left.visible {
    opacity: 1;
    transform: translateX(0);
}

.fade-in-right {
    opacity: 0;
    transform: translateX(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in-right.visible {
    opacity: 1;
    transform: translateX(0);
}

.scale-in {
    opacity: 0;
    transform: scale(0.9);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.scale-in.visible {
    opacity: 1;
    transform: scale(1);
}

/* Staggered Animations */
.stagger-1 { transition-delay: 0.1s; }
.stagger-2 { transition-delay: 0.2s; }
.stagger-3 { transition-delay: 0.3s; }
.stagger-4 { transition-delay: 0.4s; }
.stagger-5 { transition-delay: 0.5s; }
.stagger-6 { transition-delay: 0.6s; }
.stagger-7 { transition-delay: 0.7s; }
.stagger-8 { transition-delay: 0.8s; }

/* ============================================
   Responsive Design
   ============================================ */

@media (max-width: 1280px) {
    .testimonials-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 1024px) {
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 60px;
    }

    .hero-subtitle {
        margin-left: auto;
        margin-right: auto;
    }

    .hero-value-prop {
        justify-content: center;
    }

    .hero-cta {
        justify-content: center;
    }

    .hero-stats {
        justify-content: center;
    }

    .hero-image {
        order: -1;
    }

    .phone-mockup {
        width: 280px;
        height: 580px;
        transform: perspective(1000px) rotateY(0) rotateX(0);
    }

    .phone-mockup:hover {
        transform: perspective(1000px) rotateY(0) rotateX(0) scale(1.02);
    }

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

    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .difficulty-grid {
        grid-template-columns: 1fr;
        max-width: 500px;
        margin: 0 auto;
    }

    .pricing-grid {
        grid-template-columns: 1fr;
        max-width: 440px;
    }

    .pricing-card.featured {
        transform: none;
    }

    .pricing-card.featured:hover {
        transform: translateY(-8px);
    }

    .steps {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .steps::before {
        display: none;
    }

    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 40px;
    }

    .trust-stats {
        gap: 48px;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: fixed;
        top: 80px;
        left: 0;
        right: 0;
        background: var(--glass-bg-strong);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 24px;
        gap: 16px;
        box-shadow: var(--shadow-xl);
        border-bottom: 1px solid var(--glass-border);
        transform: translateY(-20px);
        opacity: 0;
        pointer-events: none;
        transition: all var(--transition-base);
    }

    .nav-links.active {
        display: flex;
        transform: translateY(0);
        opacity: 1;
        pointer-events: all;
    }

    .nav-links a {
        padding: 12px 0;
        font-size: 1rem;
    }

    .nav-links .btn {
        width: 100%;
        justify-content: center;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .mobile-menu-btn.active span:nth-child(1) {
        transform: rotate(45deg) translate(6px, 6px);
    }

    .mobile-menu-btn.active span:nth-child(2) {
        opacity: 0;
        transform: scaleX(0);
    }

    .mobile-menu-btn.active span:nth-child(3) {
        transform: rotate(-45deg) translate(6px, -6px);
    }

    .hero {
        padding: 120px 0 80px;
        min-height: auto;
    }

    .features-grid,
    .testimonials-grid {
        grid-template-columns: 1fr;
    }

    .decks-grid {
        grid-template-columns: 1fr;
    }

    .tier-title {
        justify-content: center;
        flex-wrap: wrap;
    }

    .hero-stats {
        flex-wrap: wrap;
        gap: 32px;
    }

    .trust-stats {
        flex-direction: column;
        gap: 32px;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 32px;
    }

    .footer-brand p {
        margin-left: auto;
        margin-right: auto;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 12px;
        text-align: center;
    }

    .footer-links a:hover {
        transform: none;
    }

    .curriculum-grid {
        flex-direction: column;
        align-items: center;
    }

    .curriculum-item {
        width: 100%;
        max-width: 320px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .hero-cta {
        flex-direction: column;
    }

    .hero-cta .btn {
        width: 100%;
    }

    .value-tag {
        font-size: 0.8rem;
        padding: 8px 14px;
    }

    .stat-value {
        font-size: 2rem;
    }

    .phone-mockup {
        width: 260px;
        height: 540px;
    }

    .pricing-card {
        padding: 32px 24px;
    }

    .price {
        font-size: 3rem;
    }

    .download-badges {
        flex-direction: column;
        align-items: center;
    }
}

/* ============================================
   Accessibility & Reduced Motion
   ============================================ */

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    html {
        scroll-behavior: auto;
    }

    .phone-mockup {
        animation: none;
    }

    .gradient-text {
        animation: none;
    }
}

/* Focus Styles for Accessibility */
:focus-visible {
    outline: 2px solid var(--primary-500);
    outline-offset: 2px;
}

.btn:focus-visible {
    outline: 2px solid var(--primary-300);
    outline-offset: 4px;
}

/* ============================================
   Print Styles
   ============================================ */

@media print {
    .navbar,
    .hero-bg,
    .download,
    .mobile-menu-btn {
        display: none;
    }

    body {
        background: white;
        color: black;
    }

    .hero {
        padding-top: 40px;
        min-height: auto;
    }
}