/**
 * 중등영어인강 - Main Stylesheet
 * https://middle.soritune.com/
 *
 * Cosmic Theme with Olive Young Influences
 * @version 1.0.0
 */

/* ==========================================================================
   CSS Custom Properties (Variables)
   ========================================================================== */
:root {
    /* Primary Colors - Cosmic + Green Accent */
    --color-primary: #03C75A;
    --color-primary-light: #2DD36F;
    --color-primary-dark: #029645;
    --color-primary-rgb: 3, 199, 90;

    /* Secondary Colors - Cosmic Purple/Blue */
    --color-secondary: #667eea;
    --color-secondary-light: #818cf8;
    --color-secondary-dark: #5568d3;
    --color-secondary-rgb: 102, 126, 234;

    /* Accent Colors */
    --color-accent-purple: #764ba2;
    --color-accent-pink: #f093fb;
    --color-accent-cyan: #06b6d4;
    --color-accent-gold: #ffd700;

    /* Background Colors - Dark Cosmic */
    --bg-primary: #0a0a1a;
    --bg-secondary: #12122a;
    --bg-tertiary: #1a1a3e;
    --bg-card: rgba(26, 26, 62, 0.8);
    --bg-glass: rgba(255, 255, 255, 0.05);

    /* Text Colors */
    --text-primary: #ffffff;
    --text-secondary: #a0a0c0;
    --text-muted: #6b6b8c;
    --text-dark: #0a0a1a;

    /* Gradient Definitions */
    --gradient-primary: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    --gradient-cosmic: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-green: linear-gradient(135deg, #03C75A 0%, #2DD36F 100%);
    --gradient-hero: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 50%, var(--bg-tertiary) 100%);
    --gradient-card: linear-gradient(145deg, rgba(26, 26, 62, 0.9) 0%, rgba(10, 10, 26, 0.95) 100%);
    --gradient-glow: radial-gradient(circle at center, rgba(3, 199, 90, 0.3) 0%, transparent 70%);

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
    --shadow-glow-primary: 0 0 30px rgba(3, 199, 90, 0.4);
    --shadow-glow-secondary: 0 0 30px rgba(102, 126, 234, 0.4);

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 30px;
    --radius-full: 50px;

    /* Typography */
    --font-primary: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-display: 'Orbitron', 'Noto Sans KR', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    /* Font Sizes */
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
    --text-4xl: 2.25rem;
    --text-5xl: 3rem;
    --text-6xl: 3.75rem;

    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;

    /* Layout */
    --container-max: 1400px;
    --header-height: 80px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 300ms ease;
    --transition-slow: 500ms ease;
    --transition-bounce: 500ms cubic-bezier(0.68, -0.55, 0.265, 1.55);

    /* Z-Index Scale */
    --z-base: 1;
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-fixed: 300;
    --z-modal: 400;
    --z-popover: 500;
    --z-tooltip: 600;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

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

/* ==========================================================================
   ANTIGRAVITY Canvas
   ========================================================================== */
#antigravity-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
    opacity: 0.8;
}

/* ==========================================================================
   Skip Link
   ========================================================================== */
.skip-link {
    position: absolute;
    top: -100%;
    left: 50%;
    transform: translateX(-50%);
    padding: var(--space-3) var(--space-6);
    background: var(--color-primary);
    color: var(--text-dark);
    font-weight: 600;
    border-radius: var(--radius-md);
    z-index: var(--z-tooltip);
    transition: top var(--transition-fast);
}

.skip-link:focus {
    top: var(--space-4);
}

/* ==========================================================================
   Typography
   ========================================================================== */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-primary);
    font-weight: 700;
    line-height: 1.3;
    color: var(--text-primary);
}

h1 {
    font-size: clamp(2.5rem, 5vw, var(--text-6xl));
}

h2 {
    font-size: clamp(2rem, 4vw, var(--text-5xl));
}

h3 {
    font-size: clamp(1.5rem, 3vw, var(--text-3xl));
}

h4 {
    font-size: var(--text-xl);
}

h5 {
    font-size: var(--text-lg);
}

h6 {
    font-size: var(--text-base);
}

p {
    margin-bottom: var(--space-4);
    color: var(--text-secondary);
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-primary-light);
}

/* ==========================================================================
   Header
   ========================================================================== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: rgba(10, 10, 26, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    z-index: var(--z-fixed);
    transition: all var(--transition-base);
}

.site-header.scrolled {
    height: 70px;
    background: rgba(10, 10, 26, 0.95);
    box-shadow: var(--shadow-lg);
}

.header-inner {
    max-width: var(--container-max);
    height: 100%;
    margin: 0 auto;
    padding: 0 var(--space-6);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

/* Logo */
.logo {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    color: var(--text-primary);
    text-decoration: none;
    transition: transform var(--transition-base);
}

.logo:hover {
    color: var(--text-primary);
    transform: scale(1.02);
}

.logo-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.logo-icon svg {
    width: 100%;
    height: 100%;
}

.logo-text {
    font-family: var(--font-primary);
    font-size: var(--text-xl);
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Desktop Navigation */
.main-nav {
    display: flex;
    align-items: center;
}

.nav-list {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    list-style: none;
}

.nav-link {
    display: block;
    padding: var(--space-2) var(--space-4);
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: all var(--transition-base);
    transform: translateX(-50%);
}

.nav-link:hover,
.nav-link.active {
    color: var(--text-primary);
    background: var(--bg-glass);
}

.nav-link.active::after,
.nav-link:hover::after {
    width: 60%;
}

/* Header Actions */
.header-actions {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    width: 44px;
    height: 44px;
    padding: 0;
    background: none;
    border: none;
    cursor: pointer;
    z-index: var(--z-fixed);
}

.hamburger {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 100%;
    height: 100%;
    gap: 6px;
}

.hamburger-line {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition-base);
}

.mobile-menu-toggle.active .hamburger-line:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}

.mobile-menu-toggle.active .hamburger-line:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.active .hamburger-line:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}

/* Mobile Navigation */
.mobile-nav {
    position: fixed;
    top: var(--header-height);
    right: -100%;
    width: 100%;
    max-width: 400px;
    height: calc(100vh - var(--header-height));
    background: var(--bg-secondary);
    padding: var(--space-6);
    overflow-y: auto;
    z-index: var(--z-fixed);
    transition: right var(--transition-base);
}

.mobile-nav.active {
    right: 0;
}

.mobile-nav-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    opacity: 0;
    visibility: hidden;
    z-index: calc(var(--z-fixed) - 1);
    transition: all var(--transition-base);
}

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

.mobile-nav-list {
    list-style: none;
    margin-bottom: var(--space-8);
}

.mobile-nav-item {
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.mobile-nav-link {
    display: block;
    padding: var(--space-4) 0;
    font-size: var(--text-lg);
    font-weight: 500;
    color: var(--text-secondary);
    transition: all var(--transition-base);
}

.mobile-nav-link:hover,
.mobile-nav-link.active {
    color: var(--color-primary);
    padding-left: var(--space-4);
}

.mobile-nav-actions {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    font-family: var(--font-primary);
    font-size: var(--text-sm);
    font-weight: 600;
    text-decoration: none;
    border-radius: var(--radius-full);
    border: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition-base);
    white-space: nowrap;
}

.btn-sm {
    padding: var(--space-2) var(--space-4);
    font-size: var(--text-xs);
}

.btn-lg {
    padding: var(--space-4) var(--space-8);
    font-size: var(--text-base);
}

.btn-block {
    display: flex;
    width: 100%;
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 40px rgba(3, 199, 90, 0.6);
    color: var(--text-dark);
}

/* Secondary Button */
.btn-secondary {
    background: var(--gradient-cosmic);
    color: var(--text-primary);
    box-shadow: var(--shadow-glow-secondary);
}

.btn-secondary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 40px rgba(102, 126, 234, 0.6);
    color: var(--text-primary);
}

/* Outline Button */
.btn-outline {
    background: transparent;
    color: var(--color-primary);
    border-color: var(--color-primary);
}

.btn-outline:hover {
    background: var(--color-primary);
    color: var(--text-dark);
}

/* Ghost Button */
.btn-ghost {
    background: var(--bg-glass);
    color: var(--text-primary);
    border-color: rgba(255, 255, 255, 0.1);
}

.btn-ghost:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.2);
}

/* ==========================================================================
   Main Content
   ========================================================================== */
.main-content {
    position: relative;
    z-index: var(--z-base);
    min-height: calc(100vh - var(--header-height));
    padding-top: var(--header-height);
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero-section {
    position: relative;
    min-height: calc(100vh - var(--header-height));
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-16) var(--space-6);
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
}

.hero-gradient {
    position: absolute;
    width: 600px;
    height: 600px;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.3;
    pointer-events: none;
}

.hero-gradient-1 {
    top: -200px;
    left: -100px;
    background: var(--color-primary);
}

.hero-gradient-2 {
    bottom: -200px;
    right: -100px;
    background: var(--color-secondary);
}

.hero-gradient-3 {
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: var(--color-accent-purple);
    width: 800px;
    height: 800px;
    opacity: 0.15;
}

.hero-content {
    max-width: 900px;
    text-align: center;
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    background: var(--bg-glass);
    border: 1px solid rgba(3, 199, 90, 0.3);
    border-radius: var(--radius-full);
    margin-bottom: var(--space-6);
}

.hero-badge-dot {
    width: 8px;
    height: 8px;
    background: var(--color-primary);
    border-radius: 50%;
    animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.5); opacity: 0.5; }
}

.hero-badge-text {
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-primary);
    letter-spacing: 0.5px;
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 900;
    line-height: 1.1;
    margin-bottom: var(--space-6);
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--color-primary) 50%, var(--color-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-title-highlight {
    display: inline-block;
    position: relative;
}

.hero-title-highlight::after {
    content: '';
    position: absolute;
    bottom: 5%;
    left: 0;
    width: 100%;
    height: 30%;
    background: var(--gradient-primary);
    opacity: 0.3;
    z-index: -1;
    border-radius: 4px;
}

.hero-subtitle {
    font-size: clamp(var(--text-lg), 2vw, var(--text-xl));
    color: var(--text-secondary);
    margin-bottom: var(--space-8);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.hero-actions {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-4);
    flex-wrap: wrap;
}

.hero-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-10);
    margin-top: var(--space-12);
    flex-wrap: wrap;
}

.hero-stat {
    text-align: center;
}

.hero-stat-value {
    font-family: var(--font-display);
    font-size: var(--text-4xl);
    font-weight: 700;
    color: var(--color-primary);
    display: block;
}

.hero-stat-label {
    font-size: var(--text-sm);
    color: var(--text-muted);
}

/* ==========================================================================
   Sections
   ========================================================================== */
.section {
    position: relative;
    padding: var(--space-20) var(--space-6);
}

.section-inner {
    max-width: var(--container-max);
    margin: 0 auto;
}

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

.section-label {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-primary);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: var(--space-4);
}

.section-title {
    font-size: clamp(var(--text-3xl), 4vw, var(--text-5xl));
    font-weight: 800;
    margin-bottom: var(--space-4);
}

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

/* ==========================================================================
   Cards
   ========================================================================== */
.card {
    background: var(--gradient-card);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-lg);
    padding: var(--space-8);
    position: relative;
    overflow: hidden;
    transition: all var(--transition-base);
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.card:hover {
    transform: translateY(-5px);
    border-color: rgba(3, 199, 90, 0.2);
    box-shadow: var(--shadow-lg);
}

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

.card-icon {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-glass);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-4);
    font-size: var(--text-2xl);
}

.card-title {
    font-size: var(--text-xl);
    font-weight: 700;
    margin-bottom: var(--space-3);
}

.card-description {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    margin-bottom: 0;
}

/* Feature Cards Grid */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-6);
}

/* Course Cards */
.course-card {
    background: var(--gradient-card);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-base);
}

.course-card:hover {
    transform: translateY(-5px);
    border-color: rgba(3, 199, 90, 0.3);
    box-shadow: var(--shadow-lg);
}

.course-card-image {
    position: relative;
    aspect-ratio: 16/9;
    overflow: hidden;
}

.course-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.course-card:hover .course-card-image img {
    transform: scale(1.05);
}

.course-card-badge {
    position: absolute;
    top: var(--space-3);
    left: var(--space-3);
    padding: var(--space-1) var(--space-3);
    background: var(--color-primary);
    color: var(--text-dark);
    font-size: var(--text-xs);
    font-weight: 700;
    border-radius: var(--radius-sm);
}

.course-card-content {
    padding: var(--space-6);
}

.course-card-level {
    display: inline-block;
    padding: var(--space-1) var(--space-2);
    background: var(--bg-glass);
    color: var(--color-primary);
    font-size: var(--text-xs);
    font-weight: 600;
    border-radius: var(--radius-sm);
    margin-bottom: var(--space-3);
}

.course-card-title {
    font-size: var(--text-lg);
    font-weight: 700;
    margin-bottom: var(--space-2);
}

.course-card-description {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    margin-bottom: var(--space-4);
}

.course-card-meta {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    font-size: var(--text-xs);
    color: var(--text-muted);
}

.course-card-meta span {
    display: flex;
    align-items: center;
    gap: var(--space-1);
}

/* ==========================================================================
   Slider / Carousel
   ========================================================================== */
.slider-container {
    position: relative;
    overflow: hidden;
}

.slider-wrapper {
    display: flex;
    transition: transform 500ms ease;
}

.slider-slide {
    flex: 0 0 100%;
    min-width: 100%;
}

.slider-controls {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-4);
    margin-top: var(--space-6);
}

.slider-btn {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-glass);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--transition-base);
}

.slider-btn:hover {
    background: var(--color-primary);
    color: var(--text-dark);
    border-color: var(--color-primary);
}

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

.slider-pagination {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.slider-dot {
    width: 10px;
    height: 10px;
    background: rgba(255, 255, 255, 0.2);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    transition: all var(--transition-base);
}

.slider-dot.active {
    width: 30px;
    border-radius: var(--radius-full);
    background: var(--color-primary);
}

/* ==========================================================================
   Testimonials
   ========================================================================== */
.testimonial-card {
    background: var(--gradient-card);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-lg);
    padding: var(--space-8);
    text-align: center;
}

.testimonial-avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    margin: 0 auto var(--space-4);
    overflow: hidden;
    border: 3px solid var(--color-primary);
}

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

.testimonial-content {
    font-size: var(--text-lg);
    color: var(--text-secondary);
    margin-bottom: var(--space-4);
    font-style: italic;
}

.testimonial-name {
    font-weight: 700;
    color: var(--text-primary);
}

.testimonial-info {
    font-size: var(--text-sm);
    color: var(--text-muted);
}

.testimonial-rating {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-1);
    margin-top: var(--space-3);
    color: var(--color-accent-gold);
}

/* ==========================================================================
   Stats Section
   ========================================================================== */
.stats-section {
    background: var(--gradient-card);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-8);
}

.stat-item {
    text-align: center;
    padding: var(--space-6);
}

.stat-value {
    font-family: var(--font-display);
    font-size: var(--text-5xl);
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--space-2);
}

.stat-label {
    font-size: var(--text-sm);
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* ==========================================================================
   CTA Section
   ========================================================================== */
.cta-section {
    position: relative;
    text-align: center;
    padding: var(--space-24) var(--space-6);
    overflow: hidden;
}

.cta-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-primary);
    opacity: 0.1;
    z-index: -1;
}

.cta-content {
    max-width: 700px;
    margin: 0 auto;
}

.cta-title {
    font-size: clamp(var(--text-2xl), 4vw, var(--text-4xl));
    font-weight: 800;
    margin-bottom: var(--space-4);
}

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

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
    background: var(--bg-secondary);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding-top: var(--space-16);
}

.footer-inner {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-6);
}

.footer-top {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--space-12);
    padding-bottom: var(--space-12);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-brand {
    max-width: 300px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
    color: var(--text-primary);
}

.footer-logo .logo-icon {
    width: 36px;
    height: 36px;
}

.footer-logo .logo-text {
    font-size: var(--text-lg);
    font-weight: 700;
}

.footer-description {
    font-size: var(--text-sm);
    color: var(--text-muted);
    line-height: 1.7;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-8);
}

.footer-heading {
    font-size: var(--text-sm);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-4);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.footer-menu {
    list-style: none;
}

.footer-menu li {
    margin-bottom: var(--space-2);
}

.footer-menu a {
    font-size: var(--text-sm);
    color: var(--text-muted);
    transition: color var(--transition-fast);
}

.footer-menu a:hover {
    color: var(--color-primary);
}

.footer-bottom {
    padding: var(--space-8) 0;
    text-align: center;
}

.footer-company-info {
    margin-bottom: var(--space-4);
}

.footer-company-info p {
    font-size: var(--text-xs);
    color: var(--text-muted);
    line-height: 1.8;
    margin-bottom: 0;
}

.footer-legal {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-6);
    margin-bottom: var(--space-4);
}

.footer-legal a {
    font-size: var(--text-xs);
    color: var(--text-muted);
}

.footer-legal a:hover {
    color: var(--color-primary);
}

.footer-copyright {
    font-size: var(--text-xs);
    color: var(--text-muted);
    margin-bottom: 0;
}

/* ==========================================================================
   Scroll to Top
   ========================================================================== */
.scroll-to-top {
    position: fixed;
    bottom: var(--space-6);
    right: var(--space-6);
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    border: none;
    border-radius: 50%;
    color: var(--text-dark);
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition-base);
    z-index: var(--z-sticky);
    box-shadow: var(--shadow-glow-primary);
}

.scroll-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.scroll-to-top:hover {
    transform: translateY(-5px);
    box-shadow: 0 0 40px rgba(3, 199, 90, 0.6);
}

.scroll-to-top svg {
    width: 24px;
    height: 24px;
}

/* ==========================================================================
   Utility Classes
   ========================================================================== */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-6);
}

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

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

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

.text-primary {
    color: var(--color-primary);
}

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

.text-muted {
    color: var(--text-muted);
}

.bg-glass {
    background: var(--bg-glass);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Grid Utilities */
.grid {
    display: grid;
}

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

.grid-3 {
    grid-template-columns: repeat(3, 1fr);
}

.grid-4 {
    grid-template-columns: repeat(4, 1fr);
}

.gap-4 {
    gap: var(--space-4);
}

.gap-6 {
    gap: var(--space-6);
}

.gap-8 {
    gap: var(--space-8);
}

/* Flex Utilities */
.flex {
    display: flex;
}

.flex-center {
    display: flex;
    align-items: center;
    justify-content: center;
}

.flex-between {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.flex-wrap {
    flex-wrap: wrap;
}

/* Spacing Utilities */
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }
.mt-12 { margin-top: var(--space-12); }

.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }
.mb-12 { margin-bottom: var(--space-12); }

.py-8 { padding-top: var(--space-8); padding-bottom: var(--space-8); }
.py-12 { padding-top: var(--space-12); padding-bottom: var(--space-12); }
.py-16 { padding-top: var(--space-16); padding-bottom: var(--space-16); }
.py-20 { padding-top: var(--space-20); padding-bottom: var(--space-20); }

/* ==========================================================================
   Page Specific Styles
   ========================================================================== */

/* Grammar Page */
.grammar-categories {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-6);
}

/* Vocabulary Page */
.vocab-card {
    background: var(--gradient-card);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    text-align: center;
    transition: all var(--transition-base);
}

.vocab-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.vocab-word {
    font-size: var(--text-2xl);
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--space-2);
}

.vocab-meaning {
    font-size: var(--text-base);
    color: var(--text-secondary);
}

/* Blog */
.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--space-8);
}

.blog-card {
    background: var(--gradient-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-base);
}

.blog-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.blog-card-image {
    aspect-ratio: 16/9;
    overflow: hidden;
}

.blog-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.blog-card:hover .blog-card-image img {
    transform: scale(1.05);
}

.blog-card-content {
    padding: var(--space-6);
}

.blog-card-category {
    display: inline-block;
    font-size: var(--text-xs);
    font-weight: 600;
    color: var(--color-primary);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: var(--space-3);
}

.blog-card-title {
    font-size: var(--text-xl);
    font-weight: 700;
    margin-bottom: var(--space-3);
    line-height: 1.4;
}

.blog-card-excerpt {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    margin-bottom: var(--space-4);
}

.blog-card-meta {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    font-size: var(--text-xs);
    color: var(--text-muted);
}

/* Contact Form */
.contact-form {
    max-width: 600px;
    margin: 0 auto;
}

.form-group {
    margin-bottom: var(--space-6);
}

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

.form-input,
.form-textarea,
.form-select {
    width: 100%;
    padding: var(--space-4);
    background: var(--bg-glass);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: var(--font-primary);
    font-size: var(--text-base);
    transition: all var(--transition-base);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(3, 199, 90, 0.2);
}

.form-textarea {
    min-height: 150px;
    resize: vertical;
}

.form-input::placeholder,
.form-textarea::placeholder {
    color: var(--text-muted);
}

/* FAQ */
.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.faq-question {
    width: 100%;
    padding: var(--space-5) 0;
    background: none;
    border: none;
    text-align: left;
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
    transition: color var(--transition-base);
}

.faq-question:hover {
    color: var(--color-primary);
}

.faq-question svg {
    width: 24px;
    height: 24px;
    flex-shrink: 0;
    transition: transform var(--transition-base);
}

.faq-item.active .faq-question svg {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-base);
}

.faq-item.active .faq-answer {
    max-height: 500px;
}

.faq-answer-inner {
    padding-bottom: var(--space-5);
    color: var(--text-secondary);
    line-height: 1.7;
}

/* Level Test */
.level-test-progress {
    background: var(--bg-glass);
    border-radius: var(--radius-full);
    height: 8px;
    margin-bottom: var(--space-8);
    overflow: hidden;
}

.level-test-progress-bar {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    transition: width var(--transition-base);
}

.level-test-question {
    background: var(--gradient-card);
    border-radius: var(--radius-lg);
    padding: var(--space-8);
    margin-bottom: var(--space-6);
}

.level-test-question-number {
    font-size: var(--text-sm);
    color: var(--color-primary);
    font-weight: 600;
    margin-bottom: var(--space-3);
}

.level-test-question-text {
    font-size: var(--text-xl);
    font-weight: 600;
    margin-bottom: var(--space-6);
}

.level-test-options {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.level-test-option {
    padding: var(--space-4);
    background: var(--bg-glass);
    border: 2px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
}

.level-test-option:hover {
    border-color: var(--color-primary);
}

.level-test-option.selected {
    border-color: var(--color-primary);
    background: rgba(3, 199, 90, 0.1);
}

/* ==========================================================================
   Print Styles
   ========================================================================== */
@media print {
    .site-header,
    .mobile-nav,
    .mobile-nav-overlay,
    .scroll-to-top,
    #antigravity-canvas {
        display: none !important;
    }

    .main-content {
        padding-top: 0;
    }

    body {
        background: white;
        color: black;
    }
}