/* ============================================
   BioFlash Website - Premium Modern Design
   Conversion-Optimized Landing Page
   ============================================ */

/* ============================================
   CSS Variables & Theme Configuration
   ============================================ */

:root {
    /* Primary Biology-Themed Gradient Colors */
    --primary-50: #ecfdf5;
    --primary-100: #d1fae5;
    --primary-200: #a7f3d0;
    --primary-300: #6ee7b7;
    --primary-400: #34d399;
    --primary-500: #10b981;
    --primary-600: #059669;
    --primary-700: #047857;
    --primary-800: #065f46;
    --primary-900: #064e3b;

    /* Teal Accents */
    --teal-400: #2dd4bf;
    --teal-500: #14b8a6;
    --teal-600: #0d9488;

    /* Lime Accents for Freshness */
    --lime-400: #a3e635;
    --lime-500: #84cc16;

    /* Core Theme Colors */
    --primary: #10b981;
    --primary-dark: #059669;
    --primary-light: #34d399;
    --primary-glow: rgba(16, 185, 129, 0.4);
    --primary-glow-strong: rgba(16, 185, 129, 0.6);

    --secondary: #0d9488;
    --secondary-dark: #0f766e;
    --secondary-light: #14b8a6;

    --accent: #22d3ee;
    --accent-glow: rgba(34, 211, 238, 0.3);

    /* Semantic Colors */
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    --info: #3b82f6;

    /* Neutral Colors - Light Mode */
    --text: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --text-light: #cbd5e1;

    --bg: #ffffff;
    --bg-secondary: #f0fdf4;
    --bg-tertiary: #ecfdf5;
    --bg-card: rgba(255, 255, 255, 0.8);
    --bg-glass: rgba(255, 255, 255, 0.7);
    --bg-dark: #0f172a;
    --bg-dark-secondary: #1e293b;

    --border: rgba(16, 185, 129, 0.15);
    --border-light: rgba(16, 185, 129, 0.08);
    --border-glass: rgba(255, 255, 255, 0.2);

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #10b981 0%, #059669 50%, #0d9488 100%);
    --gradient-primary-reverse: linear-gradient(135deg, #0d9488 0%, #059669 50%, #10b981 100%);
    --gradient-hero: linear-gradient(135deg, #10b981 0%, #059669 25%, #0d9488 50%, #14b8a6 75%, #2dd4bf 100%);
    --gradient-hero-bg: linear-gradient(180deg, #ecfdf5 0%, #d1fae5 30%, #ffffff 100%);
    --gradient-text: linear-gradient(135deg, #10b981 0%, #2dd4bf 50%, #22d3ee 100%);
    --gradient-glow: linear-gradient(135deg, rgba(16, 185, 129, 0.3) 0%, rgba(45, 212, 191, 0.2) 100%);
    --gradient-card: linear-gradient(145deg, rgba(255,255,255,0.9) 0%, rgba(240,253,244,0.8) 100%);
    --gradient-dark: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #0f172a 100%);
    --gradient-dark-green: linear-gradient(135deg, #064e3b 0%, #0f172a 50%, #065f46 100%);
    --gradient-radial: radial-gradient(circle at 50% 50%, rgba(16, 185, 129, 0.15) 0%, transparent 70%);
    --gradient-mesh:
        radial-gradient(at 40% 20%, rgba(16, 185, 129, 0.2) 0px, transparent 50%),
        radial-gradient(at 80% 0%, rgba(45, 212, 191, 0.15) 0px, transparent 50%),
        radial-gradient(at 0% 50%, rgba(34, 211, 238, 0.1) 0px, transparent 50%),
        radial-gradient(at 80% 50%, rgba(16, 185, 129, 0.1) 0px, transparent 50%),
        radial-gradient(at 0% 100%, rgba(45, 212, 191, 0.15) 0px, transparent 50%);

    /* Shadows */
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05), 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -2px rgba(0, 0, 0, 0.04);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-xl: 0 25px 50px -12px rgba(0, 0, 0, 0.15);
    --shadow-2xl: 0 35px 60px -15px rgba(0, 0, 0, 0.2);
    --shadow-glow: 0 0 40px var(--primary-glow);
    --shadow-glow-lg: 0 0 60px var(--primary-glow-strong);
    --shadow-colored: 0 20px 40px -10px rgba(16, 185, 129, 0.3);
    --shadow-glass: 0 8px 32px rgba(0, 0, 0, 0.08);

    /* Spacing & Sizing */
    --radius-sm: 8px;
    --radius: 12px;
    --radius-md: 16px;
    --radius-lg: 20px;
    --radius-xl: 24px;
    --radius-2xl: 32px;
    --radius-full: 9999px;

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

    /* Transitions */
    --transition-fast: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: all 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);

    /* Animation Timing */
    --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-in-out-expo: cubic-bezier(0.87, 0, 0.13, 1);
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
    :root.auto-dark {
        --text: #f1f5f9;
        --text-secondary: #cbd5e1;
        --text-muted: #94a3b8;
        --bg: #0f172a;
        --bg-secondary: #1e293b;
        --bg-tertiary: #334155;
        --bg-card: rgba(30, 41, 59, 0.8);
        --bg-glass: rgba(30, 41, 59, 0.7);
        --border: rgba(16, 185, 129, 0.2);
        --border-light: rgba(16, 185, 129, 0.1);
    }
}

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

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

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

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

@media (min-width: 1536px) {
    .container {
        max-width: 1400px;
    }
}

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

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.025em;
    color: var(--text);
}

h1 {
    font-size: clamp(2.75rem, 7vw, 5rem);
    font-weight: 800;
    letter-spacing: -0.03em;
}

h2 {
    font-size: clamp(2.25rem, 5vw, 3.5rem);
    font-weight: 800;
}

h3 {
    font-size: clamp(1.25rem, 2vw, 1.5rem);
    font-weight: 700;
}

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

/* Gradient Text Animation */
.gradient-text {
    background: var(--gradient-text);
    background-size: 200% 200%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: gradientShift 8s ease infinite;
}

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

/* ============================================
   Glassmorphism Utilities
   ============================================ */

.glass {
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-glass);
}

.glass-strong {
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(30px) saturate(150%);
    -webkit-backdrop-filter: blur(30px) saturate(150%);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.glass-dark {
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

/* ============================================
   Buttons - Modern & Conversion Optimized
   ============================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 16px 32px;
    border-radius: var(--radius-lg);
    font-weight: 600;
    font-size: 1rem;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    isolation: isolate;
    white-space: nowrap;
}

.btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(rgba(255,255,255,0.25), transparent);
    opacity: 0;
    transition: var(--transition-fast);
}

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

/* Primary CTA Button with Glow */
.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow:
        var(--shadow-md),
        0 4px 20px var(--primary-glow),
        inset 0 1px 0 rgba(255,255,255,0.2);
}

.btn-primary:hover {
    transform: translateY(-4px) scale(1.02);
    box-shadow:
        var(--shadow-xl),
        0 8px 40px var(--primary-glow-strong),
        inset 0 1px 0 rgba(255,255,255,0.2);
}

.btn-primary:active {
    transform: translateY(-2px) scale(1);
}

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

@keyframes btnPulse {
    0%, 100% {
        box-shadow:
            var(--shadow-md),
            0 4px 20px var(--primary-glow),
            inset 0 1px 0 rgba(255,255,255,0.2);
    }
    50% {
        box-shadow:
            var(--shadow-lg),
            0 6px 30px var(--primary-glow-strong),
            inset 0 1px 0 rgba(255,255,255,0.2);
    }
}

/* Secondary Button */
.btn-secondary {
    background: var(--bg-glass);
    color: var(--text);
    border: 2px solid var(--border);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: var(--bg);
    border-color: var(--primary);
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

/* Large Button */
.btn-large {
    padding: 20px 40px;
    font-size: 1.125rem;
    border-radius: var(--radius-xl);
}

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

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid rgba(16, 185, 129, 0.1);
    transition: var(--transition);
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.95);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.08);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    font-weight: 800;
    font-size: 1.5rem;
    color: var(--text);
    transition: var(--transition);
}

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

.logo-icon {
    font-size: 2rem;
    filter: drop-shadow(0 2px 8px rgba(16, 185, 129, 0.3));
    animation: logoFloat 3s ease-in-out infinite;
}

@keyframes logoFloat {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-3px); }
}

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

.nav-links a {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition);
    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: var(--transition);
}

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

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

.nav-links .btn {
    padding: 12px 24px;
}

/* Mobile Menu Button */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 6px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    z-index: 1001;
}

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

/* ============================================
   Hero Section - Premium Design
   ============================================ */

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

/* Animated Background Mesh */
.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--gradient-mesh);
    opacity: 0.8;
    animation: meshMove 20s ease-in-out infinite;
}

@keyframes meshMove {
    0%, 100% { transform: translate(0, 0) scale(1); }
    25% { transform: translate(2%, 1%) scale(1.02); }
    50% { transform: translate(0, 2%) scale(1); }
    75% { transform: translate(-2%, 1%) scale(1.02); }
}

/* Floating Orbs/Particles */
.hero::after {
    content: '';
    position: absolute;
    top: 20%;
    right: 10%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(16, 185, 129, 0.2) 0%, transparent 70%);
    border-radius: 50%;
    filter: blur(60px);
    animation: orbFloat 8s ease-in-out infinite;
    pointer-events: none;
}

@keyframes orbFloat {
    0%, 100% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(-30px, 30px) scale(1.1); }
}

.hero-bg {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 200px;
    background: linear-gradient(to top, var(--bg), transparent);
    pointer-events: none;
}

/* Hero Particles */
.hero-particles {
    position: absolute;
    inset: 0;
    overflow: hidden;
    pointer-events: none;
}

.particle {
    position: absolute;
    width: 6px;
    height: 6px;
    background: var(--primary);
    border-radius: 50%;
    opacity: 0.3;
    animation: particleFloat 15s ease-in-out infinite;
}

@keyframes particleFloat {
    0%, 100% {
        transform: translateY(100vh) rotate(0deg);
        opacity: 0;
    }
    10% { opacity: 0.3; }
    90% { opacity: 0.3; }
    100% {
        transform: translateY(-100px) rotate(360deg);
        opacity: 0;
    }
}

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

/* Hero Badge */
.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: var(--bg-glass);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding: 12px 24px;
    border-radius: var(--radius-full);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 32px;
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    animation: fadeInDown 0.8s var(--ease-out-expo) both;
}

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

/* Hero Content */
.hero-content h1 {
    animation: fadeInUp 0.8s var(--ease-out-expo) 0.1s both;
}

.hero-subtitle {
    font-size: 1.35rem;
    margin: 32px 0 40px;
    max-width: 560px;
    line-height: 1.75;
    color: var(--text-secondary);
    animation: fadeInUp 0.8s var(--ease-out-expo) 0.2s both;
}

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

/* Value Props */
.hero-value-prop {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 40px;
    animation: fadeInUp 0.8s var(--ease-out-expo) 0.3s both;
}

.value-tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.1), rgba(45, 212, 191, 0.1));
    border: 1px solid var(--border);
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--primary-700);
}

.value-tag::before {
    content: '';
    width: 6px;
    height: 6px;
    background: var(--primary);
    border-radius: 50%;
}

/* Hero CTA */
.hero-cta {
    display: flex;
    gap: 20px;
    margin-bottom: 64px;
    flex-wrap: wrap;
    animation: fadeInUp 0.8s var(--ease-out-expo) 0.4s both;
}

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

.stat {
    display: flex;
    flex-direction: column;
    position: relative;
}

.stat::after {
    content: '';
    position: absolute;
    right: -24px;
    top: 50%;
    transform: translateY(-50%);
    width: 1px;
    height: 40px;
    background: var(--border);
}

.stat:last-child::after {
    display: none;
}

.stat-value {
    font-size: 2.75rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.1;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-muted);
    font-weight: 500;
    margin-top: 4px;
}

/* Hero Phone Mockup */
.hero-image {
    display: flex;
    justify-content: center;
    position: relative;
    animation: fadeInRight 1s var(--ease-out-expo) 0.3s both;
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(60px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.phone-mockup {
    width: 340px;
    height: 700px;
    background: linear-gradient(145deg, #1e293b 0%, #0f172a 100%);
    border-radius: 55px;
    padding: 12px;
    box-shadow:
        var(--shadow-2xl),
        0 0 0 1px rgba(255,255,255,0.1) inset,
        0 0 80px rgba(16, 185, 129, 0.25);
    position: relative;
    transform: perspective(1200px) rotateY(-8deg) rotateX(4deg);
    animation: phoneFloat 6s ease-in-out infinite;
    transition: transform 0.6s var(--ease-out-expo);
}

.phone-mockup:hover {
    transform: perspective(1200px) rotateY(0deg) rotateX(0deg) scale(1.02);
    animation-play-state: paused;
}

@keyframes phoneFloat {
    0%, 100% {
        transform: perspective(1200px) rotateY(-8deg) rotateX(4deg) translateY(0);
    }
    50% {
        transform: perspective(1200px) rotateY(-8deg) rotateX(4deg) translateY(-20px);
    }
}

/* Phone Glow Effect */
.phone-mockup::before {
    content: '';
    position: absolute;
    top: 12px;
    left: 50%;
    transform: translateX(-50%);
    width: 120px;
    height: 32px;
    background: #0f172a;
    border-radius: 20px;
    z-index: 10;
}

.phone-mockup::after {
    content: '';
    position: absolute;
    inset: -40px;
    background: radial-gradient(circle at 50% 30%, rgba(16, 185, 129, 0.3), transparent 60%);
    pointer-events: none;
    z-index: -1;
    animation: glowPulse 4s ease-in-out infinite;
}

@keyframes glowPulse {
    0%, 100% { opacity: 0.6; }
    50% { opacity: 1; }
}

.phone-screen {
    width: 100%;
    height: 100%;
    background: var(--bg);
    border-radius: 45px;
    overflow: hidden;
    box-shadow: inset 0 0 0 1px rgba(0,0,0,0.1);
}

.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: 1.15rem;
    color: var(--text);
}

.preview-count {
    background: var(--gradient-primary);
    color: white;
    padding: 8px 16px;
    border-radius: var(--radius-full);
    font-size: 0.8rem;
    font-weight: 700;
    box-shadow: var(--shadow-sm);
}

.preview-card {
    background: linear-gradient(135deg, var(--bg-secondary), var(--bg-tertiary));
    border-radius: var(--radius-lg);
    padding: 28px;
    margin-bottom: 24px;
    border: 1px solid var(--border-light);
    box-shadow: var(--shadow-sm);
}

.preview-question {
    font-weight: 600;
    margin-bottom: 20px;
    font-size: 0.95rem;
    line-height: 1.6;
    color: var(--text);
}

.preview-answer {
    color: var(--primary);
    font-weight: 700;
    font-size: 1rem;
}

.preview-buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
}

.preview-btn {
    padding: 14px 8px;
    border-radius: var(--radius);
    text-align: center;
    font-size: 0.7rem;
    font-weight: 800;
    color: white;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    box-shadow: var(--shadow-sm);
}

.preview-btn.again { background: linear-gradient(135deg, #ef4444, #dc2626); }
.preview-btn.hard { background: linear-gradient(135deg, #f59e0b, #d97706); }
.preview-btn.good { background: linear-gradient(135deg, #10b981, #059669); }
.preview-btn.easy { background: linear-gradient(135deg, #3b82f6, #2563eb); }

/* ============================================
   Trust Banner
   ============================================ */

.trust-banner {
    padding: 60px 0;
    background: var(--bg);
    border-top: 1px solid var(--border-light);
    border-bottom: 1px solid var(--border-light);
}

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

.trust-text {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 24px;
    font-weight: 500;
}

.trust-logos {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 32px;
}

.trust-logos span {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-muted);
    opacity: 0.7;
    transition: var(--transition);
}

.trust-logos span:hover {
    opacity: 1;
    color: var(--text-secondary);
}

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

.section-header {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 80px;
}

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

.section-header p {
    font-size: 1.25rem;
    line-height: 1.75;
    color: var(--text-secondary);
}

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

.difficulty-levels {
    padding: 140px 0;
    background: var(--bg);
    position: relative;
}

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

.level-card {
    position: relative;
    background: var(--bg-glass);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--border);
    border-radius: var(--radius-2xl);
    padding: 40px 32px;
    transition: var(--transition);
    overflow: hidden;
}

.level-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
    opacity: 0.5;
    transition: var(--transition);
}

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

.level-card:hover::before {
    opacity: 1;
}

.level-badge {
    display: inline-block;
    padding: 6px 14px;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 20px;
}

.level-card.beginner .level-badge {
    background: linear-gradient(135deg, #10b981, #34d399);
    color: white;
}

.level-card.intermediate .level-badge {
    background: linear-gradient(135deg, #3b82f6, #60a5fa);
    color: white;
}

.level-card.advanced .level-badge {
    background: linear-gradient(135deg, #8b5cf6, #a78bfa);
    color: white;
}

.level-icon {
    font-size: 3.5rem;
    margin-bottom: 20px;
    display: block;
}

.level-card h3 {
    margin-bottom: 12px;
    font-size: 1.4rem;
}

.level-card > p {
    font-size: 1rem;
    line-height: 1.7;
    margin-bottom: 24px;
}

.level-details {
    list-style: none;
    margin-bottom: 24px;
}

.level-details li {
    padding: 10px 0;
    font-size: 0.9rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 10px;
    border-bottom: 1px solid var(--border-light);
}

.level-details li:last-child {
    border-bottom: none;
}

.level-details li::before {
    content: '';
    width: 8px;
    height: 8px;
    background: var(--primary);
    border-radius: 50%;
    flex-shrink: 0;
}

.level-stats {
    margin-top: auto;
}

.level-stats span {
    display: inline-block;
    padding: 10px 18px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--primary-700);
}

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

.curriculum-coverage {
    padding: 140px 0;
    background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg) 100%);
}

.curriculum-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.curriculum-item {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: 36px 28px;
    text-align: center;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.curriculum-item::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--gradient-glow);
    opacity: 0;
    transition: var(--transition);
}

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

.curriculum-item:hover::before {
    opacity: 1;
}

.curriculum-icon {
    font-size: 3rem;
    margin-bottom: 20px;
    display: block;
    position: relative;
    z-index: 1;
}

.curriculum-item h3 {
    margin-bottom: 10px;
    position: relative;
    z-index: 1;
}

.curriculum-item p {
    font-size: 0.9rem;
    line-height: 1.6;
    position: relative;
    z-index: 1;
}

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

.features {
    padding: 140px 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), transparent);
}

.features::after {
    content: '';
    position: absolute;
    top: 50%;
    right: -200px;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(16, 185, 129, 0.1) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 28px;
}

.feature-card {
    background: var(--bg);
    padding: 36px 28px;
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-light);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.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: var(--transition);
}

.feature-card::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.02), transparent);
    opacity: 0;
    transition: var(--transition);
}

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

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

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

.feature-icon {
    font-size: 3rem;
    margin-bottom: 20px;
    display: block;
    position: relative;
    z-index: 1;
}

.feature-card h3 {
    margin-bottom: 12px;
    font-size: 1.15rem;
    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: 140px 0;
    position: relative;
}

.decks-tier {
    margin-bottom: 80px;
}

.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: 0.75rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 1.5px;
}

.tier-badge.free {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-sm), 0 4px 15px var(--primary-glow);
}

.tier-badge.pro {
    background: linear-gradient(135deg, #f59e0b, #ea580c);
    color: white;
    box-shadow: var(--shadow-sm), 0 4px 15px rgba(245, 158, 11, 0.3);
}

.decks-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 28px;
}

.deck-card {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: 36px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

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

.deck-card::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, transparent 0%, rgba(var(--deck-color-rgb), 0.03) 100%);
    opacity: 0;
    transition: var(--transition);
}

.deck-card:hover {
    border-color: var(--deck-color);
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
}

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

.deck-card.premium {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.03) 0%, rgba(234, 88, 12, 0.03) 100%);
    border-color: rgba(245, 158, 11, 0.2);
}

.deck-card.premium::before {
    background: linear-gradient(90deg, #f59e0b, #ea580c);
}

.deck-badge {
    position: absolute;
    top: 20px;
    right: 20px;
    background: linear-gradient(135deg, #f59e0b, #ea580c);
    color: white;
    padding: 6px 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;
}

.deck-card h3 {
    margin-bottom: 10px;
    font-size: 1.35rem;
}

.deck-card p {
    font-size: 0.9rem;
    line-height: 1.6;
    margin-bottom: 20px;
}

.deck-count {
    display: inline-block;
    padding: 8px 16px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
}

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

.how-it-works {
    padding: 140px 0;
    background: linear-gradient(180deg, var(--bg) 0%, var(--bg-secondary) 100%);
}

.steps {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 60px;
    position: relative;
}

.steps::before {
    content: '';
    position: absolute;
    top: 40px;
    left: 15%;
    right: 15%;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--secondary), var(--teal-500));
    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: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    font-weight: 800;
    margin: 0 auto 32px;
    box-shadow: var(--shadow-lg), 0 8px 30px var(--primary-glow);
    position: relative;
}

.step-number::after {
    content: '';
    position: absolute;
    inset: -8px;
    border: 3px solid var(--primary-light);
    border-radius: 50%;
    opacity: 0.3;
}

.step h3 {
    margin-bottom: 16px;
    font-size: 1.35rem;
}

.step p {
    font-size: 1rem;
    line-height: 1.7;
    max-width: 280px;
    margin: 0 auto;
}

/* ============================================
   Pricing Section - Conversion Optimized
   ============================================ */

.pricing {
    padding: 140px 0;
    background: var(--bg);
    position: relative;
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    max-width: 1200px;
    margin: 0 auto;
    align-items: stretch;
}

.pricing-card {
    background: var(--bg);
    border: 2px solid var(--border);
    border-radius: var(--radius-2xl);
    padding: 48px 40px;
    text-align: center;
    position: relative;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.pricing-card:hover {
    transform: translateY(-12px);
    box-shadow: var(--shadow-xl);
}

/* Featured/Best Value Card */
.pricing-card.featured {
    background: var(--gradient-dark-green);
    border: 2px solid transparent;
    color: white;
    transform: scale(1.05);
    box-shadow:
        var(--shadow-2xl),
        0 0 0 1px rgba(16, 185, 129, 0.5),
        0 0 60px rgba(16, 185, 129, 0.3);
    z-index: 1;
}

.pricing-card.featured::before {
    content: '';
    position: absolute;
    inset: -2px;
    background: var(--gradient-primary);
    border-radius: var(--radius-2xl);
    z-index: -1;
    animation: glowBorder 3s ease-in-out infinite;
}

@keyframes glowBorder {
    0%, 100% { opacity: 0.5; }
    50% { opacity: 1; }
}

.pricing-card.featured:hover {
    transform: scale(1.05) translateY(-12px);
}

.pricing-card.featured h3,
.pricing-card.featured .price {
    color: white;
}

.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: white;
    padding: 10px 28px;
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    font-weight: 700;
    white-space: nowrap;
    box-shadow: var(--shadow-md), 0 4px 20px var(--primary-glow);
}

.pricing-header {
    margin-bottom: 32px;
}

.pricing-header h3 {
    font-size: 1.5rem;
    margin-bottom: 16px;
}

.price {
    font-size: 4rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
    margin-bottom: 8px;
}

.pricing-card.featured .price {
    background: linear-gradient(135deg, #4ade80, #22d3ee);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.price span {
    font-size: 1.1rem;
    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 {
    font-size: 0.95rem;
}

.pricing-features {
    list-style: none;
    text-align: left;
    margin-bottom: 36px;
    flex-grow: 1;
}

.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::before {
    content: '';
    width: 20px;
    height: 20px;
    background: var(--gradient-primary);
    border-radius: 50%;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: center;
    background-size: 12px;
}

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

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

.pricing-card.featured .btn-primary {
    background: white;
    color: var(--text);
    box-shadow: var(--shadow-md);
}

.pricing-card.featured .btn-primary:hover {
    background: var(--bg-secondary);
    transform: translateY(-4px);
}

.pricing-guarantee {
    text-align: center;
    margin-top: 48px;
}

.pricing-guarantee p {
    font-size: 1rem;
    color: var(--text-muted);
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.pricing-guarantee p::before {
    content: '';
    width: 20px;
    height: 20px;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='20' height='20' viewBox='0 0 24 24' fill='none' stroke='%2310b981' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M12 22s8-4 8-10V5l-8-3-8 3v7c0 6 8 10 8 10z'%3E%3C/path%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-size: contain;
}

/* ============================================
   Testimonials - Modern Carousel Look
   ============================================ */

.testimonials {
    padding: 140px 0;
    background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg) 100%);
    position: relative;
    overflow: hidden;
}

.testimonials::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(16, 185, 129, 0.08) 0%, transparent 70%);
    pointer-events: none;
}

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

.testimonial-card {
    background: var(--bg);
    padding: 40px;
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-light);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.testimonial-card::before {
    content: '"';
    position: absolute;
    top: 20px;
    right: 30px;
    font-size: 6rem;
    font-family: Georgia, serif;
    color: var(--primary);
    opacity: 0.1;
    line-height: 1;
}

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

.testimonial-stars {
    color: #f59e0b;
    font-size: 1.3rem;
    margin-bottom: 24px;
    letter-spacing: 3px;
}

.testimonial-card > p {
    font-style: italic;
    margin-bottom: 32px;
    font-size: 1.05rem;
    line-height: 1.85;
    color: var(--text-secondary);
}

.testimonial-card > p strong {
    color: var(--text);
    font-weight: 600;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: 16px;
}

.testimonial-author::before {
    content: '';
    width: 48px;
    height: 48px;
    background: var(--gradient-primary);
    border-radius: 50%;
    flex-shrink: 0;
    opacity: 0.8;
}

.testimonial-author strong {
    display: block;
    color: var(--text);
    font-size: 1rem;
    margin-bottom: 2px;
}

.testimonial-author span {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* ============================================
   Social Proof Banner
   ============================================ */

.social-proof-banner {
    padding: 80px 0;
    background: var(--bg);
    border-top: 1px solid var(--border-light);
    border-bottom: 1px solid var(--border-light);
}

.proof-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
    text-align: center;
}

.proof-stat {
    position: relative;
}

.proof-stat::after {
    content: '';
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 1px;
    height: 50px;
    background: var(--border);
}

.proof-stat:last-child::after {
    display: none;
}

.proof-number {
    display: block;
    font-size: 3rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
    margin-bottom: 8px;
}

.proof-label {
    font-size: 1rem;
    color: var(--text-muted);
    font-weight: 500;
}

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

.download {
    padding: 160px 0;
    background: var(--gradient-dark-green);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.download::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -20%;
    width: 70%;
    height: 150%;
    background: radial-gradient(circle, rgba(16, 185, 129, 0.25) 0%, transparent 60%);
    pointer-events: none;
    animation: downloadGlow 8s ease-in-out infinite;
}

@keyframes downloadGlow {
    0%, 100% { transform: translate(0, 0); }
    50% { transform: translate(5%, 5%); }
}

.download::after {
    content: '';
    position: absolute;
    bottom: -50%;
    right: -20%;
    width: 60%;
    height: 150%;
    background: radial-gradient(circle, rgba(45, 212, 191, 0.2) 0%, transparent 60%);
    pointer-events: none;
}

.download-content {
    position: relative;
    z-index: 1;
    max-width: 700px;
    margin: 0 auto;
}

.download-content h2 {
    color: white;
    margin-bottom: 24px;
}

.download-content > p {
    color: rgba(255, 255, 255, 0.8);
    font-size: 1.35rem;
    line-height: 1.7;
    margin-bottom: 48px;
}

.download-badges {
    display: flex;
    gap: 24px;
    justify-content: center;
    flex-wrap: wrap;
}

.app-store-badge {
    transition: var(--transition);
}

.app-store-badge img {
    height: 70px;
    filter: drop-shadow(0 4px 20px rgba(0,0,0,0.3));
    transition: var(--transition);
}

.app-store-badge:hover {
    transform: translateY(-6px);
}

.app-store-badge:hover img {
    filter: drop-shadow(0 8px 30px rgba(0,0,0,0.4));
}

.download-note {
    margin-top: 36px;
    font-size: 0.95rem;
    color: rgba(255, 255, 255, 0.5);
}

/* ============================================
   Footer - Modern Dark Gradient
   ============================================ */

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

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(16, 185, 129, 0.3), transparent);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 60px;
    margin-bottom: 80px;
}

.footer-brand p {
    color: rgba(255, 255, 255, 0.5);
    margin-top: 24px;
    font-size: 1rem;
    line-height: 1.7;
    max-width: 300px;
}

.footer-brand .logo {
    color: white;
}

.footer-links h4 {
    margin-bottom: 28px;
    font-size: 0.85rem;
    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);
    text-decoration: none;
    padding: 12px 0;
    font-size: 0.95rem;
    transition: var(--transition);
    position: relative;
}

.footer-links a::before {
    content: '';
    position: absolute;
    left: -16px;
    top: 50%;
    transform: translateY(-50%);
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--primary-light);
    transform: translateX(8px);
}

.footer-links a:hover::before {
    width: 8px;
}

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

/* Social Links */
.footer-social {
    display: flex;
    gap: 16px;
}

.footer-social a {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: var(--transition);
}

.footer-social a:hover {
    background: var(--primary);
    color: white;
    transform: translateY(-4px);
}

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

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-on-scroll {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s var(--ease-out-expo), transform 0.8s var(--ease-out-expo);
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Staggered Animation */
.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; }

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

@media (max-width: 1200px) {
    .features-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: 300px;
        height: 620px;
        transform: none;
        animation: phoneFloatSimple 6s ease-in-out infinite;
    }

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

    .levels-grid,
    .curriculum-grid {
        grid-template-columns: 1fr;
        max-width: 500px;
        margin-left: auto;
        margin-right: auto;
    }

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

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

    .pricing-grid {
        grid-template-columns: 1fr;
        max-width: 450px;
        margin-left: auto;
        margin-right: auto;
    }

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

    .pricing-card.featured:hover {
        transform: translateY(-12px);
    }

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

    .steps::before {
        display: none;
    }

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

    .proof-stat:nth-child(2)::after {
        display: none;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

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

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

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

    .stat::after {
        display: none;
    }

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

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

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

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

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

    .footer-bottom {
        flex-direction: column;
        gap: 20px;
        text-align: center;
    }

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

    .footer-links a::before {
        display: none;
    }

    .proof-stats {
        grid-template-columns: 1fr 1fr;
        gap: 32px;
    }

    .proof-stat::after {
        display: none;
    }

    .download-content > p {
        font-size: 1.15rem;
    }

    .section-header {
        margin-bottom: 60px;
    }

    .section-header p {
        font-size: 1.1rem;
    }
}

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

    h1 {
        font-size: 2.25rem;
    }

    h2 {
        font-size: 1.75rem;
    }

    .hero-cta {
        flex-direction: column;
        width: 100%;
    }

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

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

    .pricing-card {
        padding: 36px 24px;
    }

    .testimonial-card {
        padding: 28px;
    }

    .feature-card {
        padding: 28px 20px;
    }
}

/* ============================================
   Utility Classes
   ============================================ */

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.hidden { display: none !important; }
.visible { visibility: visible !important; }
.invisible { visibility: hidden !important; }

.overflow-hidden { overflow: hidden; }
.overflow-visible { overflow: visible; }

.relative { position: relative; }
.absolute { position: absolute; }
.fixed { position: fixed; }

.z-0 { z-index: 0; }
.z-10 { z-index: 10; }
.z-20 { z-index: 20; }
.z-50 { z-index: 50; }
.z-100 { z-index: 100; }

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

@media print {
    .navbar,
    .hero-bg,
    .hero-particles,
    .phone-mockup::after {
        display: none !important;
    }

    body {
        background: white;
        color: black;
    }

    .hero {
        min-height: auto;
        padding: 40px 0;
    }
}