/* ========================================
   YKS Rekabetçi - Ana Stil Dosyası
   Modern, Koyu Tema, Eğitim Platformu
   ======================================== */

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

:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-card: #1a1a25;
    --bg-card-hover: #22222f;
    --bg-elevated: #252535;
    --text-primary: #ffffff;
    --text-secondary: #a0a0b8;
    --text-muted: #6b6b80;
    --accent: #6c5ce7;
    --accent-light: #a29bfe;
    --accent-dark: #5a4bd1;
    --success: #00b894;
    --warning: #fdcb6e;
    --danger: #e17055;
    --gold: #ffd700;
    --silver: #c0c0c0;
    --bronze: #cd7f32;
    --gradient-primary: linear-gradient(135deg, #6c5ce7, #a29bfe);
    --gradient-hero: linear-gradient(135deg, #0a0a0f 0%, #1a1a2e 50%, #16213e 100%);
    --border: #2a2a3a;
    --shadow: 0 4px 24px rgba(0,0,0,0.3);
    --shadow-lg: 0 8px 48px rgba(0,0,0,0.4);
    --radius: 12px;
    --radius-lg: 20px;
    --transition: all 0.3s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

a {
    color: var(--accent-light);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--accent);
}

img {
    max-width: 100%;
    height: auto;
}

/* ========================================
   Development Banner
   ======================================== */
.dev-banner {
    background: linear-gradient(90deg, #e17055, #fdcb6e);
    color: #1a1a25;
    padding: 10px 0;
    text-align: center;
    font-size: 14px;
    font-weight: 500;
    position: sticky;
    top: 0;
    z-index: 1001;
}

.dev-banner .container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.dev-banner-icon {
    font-size: 16px;
}

/* ========================================
   Navbar
   ======================================== */
.navbar {
    background: rgba(10, 10, 15, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    padding: 16px 0;
    position: sticky;
    top: 40px;
    z-index: 1000;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 22px;
    font-weight: 800;
    color: var(--text-primary) !important;
}

.logo-icon {
    font-size: 28px;
}

.logo-text .accent {
    color: var(--accent-light);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 8px;
    list-style: none;
}

.nav-links a {
    color: var(--text-secondary);
    padding: 8px 16px;
    border-radius: 8px;
    font-weight: 500;
    font-size: 15px;
    transition: var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--text-primary);
    background: var(--bg-card);
}

.nav-links .btn-nav {
    background: var(--gradient-primary);
    color: white !important;
    padding: 10px 20px;
    border-radius: 10px;
    font-weight: 600;
}

.nav-links .btn-nav:hover {
    opacity: 0.9;
    transform: translateY(-1px);
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 24px;
    cursor: pointer;
    padding: 8px;
}

/* ========================================
   Buttons
   ======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: 10px;
    font-weight: 600;
    font-size: 15px;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    font-family: inherit;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 4px 16px rgba(108, 92, 231, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(108, 92, 231, 0.4);
    color: white;
}

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

.btn-secondary:hover {
    background: var(--bg-card-hover);
    color: var(--text-primary);
}

.btn-outline {
    background: transparent;
    color: var(--accent-light);
    border: 2px solid var(--accent);
}

.btn-outline:hover {
    background: var(--accent);
    color: white;
}

.btn-lg {
    padding: 16px 32px;
    font-size: 17px;
    border-radius: 12px;
}

.btn-xl {
    padding: 20px 40px;
    font-size: 19px;
    border-radius: 14px;
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
    background: var(--gradient-hero);
    padding: 80px 0 100px;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(108, 92, 231, 0.15), transparent 70%);
    border-radius: 50%;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(162, 155, 254, 0.1), transparent 70%);
    border-radius: 50%;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-block;
    background: rgba(108, 92, 231, 0.15);
    border: 1px solid rgba(108, 92, 231, 0.3);
    color: var(--accent-light);
    padding: 8px 20px;
    border-radius: 50px;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 24px;
}

.hero h1 {
    font-size: 52px;
    font-weight: 900;
    line-height: 1.15;
    margin-bottom: 20px;
    letter-spacing: -1px;
}

.hero .accent {
    color: var(--accent-light);
}

.hero-desc {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 32px;
    max-width: 520px;
    line-height: 1.7;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    margin-bottom: 48px;
    flex-wrap: wrap;
}

.hero-stats {
    display: flex;
    gap: 40px;
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 32px;
    font-weight: 800;
    color: var(--accent-light);
}

.stat-label {
    font-size: 13px;
    color: var(--text-muted);
    font-weight: 500;
}

/* Phone Mockup */
.hero-visual {
    display: flex;
    justify-content: center;
}

.phone-mockup {
    width: 300px;
    background: var(--bg-card);
    border-radius: 32px;
    padding: 12px;
    border: 2px solid var(--border);
    box-shadow: var(--shadow-lg);
}

.phone-screen {
    background: var(--bg-secondary);
    border-radius: 24px;
    padding: 24px 20px;
    min-height: 400px;
}

.mock-header {
    font-size: 18px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border);
}

.mock-rank-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.mock-rank-item {
    background: var(--bg-card);
    padding: 12px 16px;
    border-radius: 10px;
    font-size: 14px;
    font-weight: 500;
    border: 1px solid var(--border);
}

.mock-rank-item.gold {
    border-color: var(--gold);
    background: rgba(255, 215, 0, 0.1);
}

.mock-rank-item.silver {
    border-color: var(--silver);
    background: rgba(192, 192, 192, 0.1);
}

.mock-rank-item.bronze {
    border-color: var(--bronze);
    background: rgba(205, 127, 50, 0.1);
}

.mock-rank-item.highlight {
    border-color: var(--accent);
    background: rgba(108, 92, 231, 0.15);
    color: var(--accent-light);
}

.mock-timer {
    text-align: center;
    margin-top: 20px;
    padding: 12px;
    background: rgba(108, 92, 231, 0.1);
    border-radius: 10px;
    font-weight: 600;
    color: var(--accent-light);
}

/* ========================================
   Sections
   ======================================== */
.section {
    padding: 80px 0;
}

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

.section-badge {
    display: inline-block;
    background: rgba(108, 92, 231, 0.15);
    border: 1px solid rgba(108, 92, 231, 0.3);
    color: var(--accent-light);
    padding: 6px 16px;
    border-radius: 50px;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 16px;
}

.section-header h2 {
    font-size: 40px;
    font-weight: 800;
    margin-bottom: 12px;
}

.section-header p {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

.section-cta {
    text-align: center;
    margin-top: 48px;
}

/* ========================================
   Features Grid
   ======================================== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: var(--transition);
}

.feature-card:hover {
    background: var(--bg-card-hover);
    transform: translateY(-4px);
    box-shadow: var(--shadow);
    border-color: var(--accent);
}

.feature-icon {
    font-size: 40px;
    margin-bottom: 16px;
}

.feature-card h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 10px;
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 15px;
    line-height: 1.6;
}

/* ========================================
   Steps
   ======================================== */
.steps-grid {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 24px;
}

.step-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 40px 32px;
    text-align: center;
    flex: 1;
    max-width: 300px;
    transition: var(--transition);
}

.step-card:hover {
    border-color: var(--accent);
    transform: translateY(-4px);
}

.step-number {
    width: 60px;
    height: 60px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    font-weight: 800;
    margin: 0 auto 20px;
}

.step-card h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 10px;
}

.step-card p {
    color: var(--text-secondary);
    font-size: 15px;
}

.step-connector {
    font-size: 28px;
    color: var(--accent);
    font-weight: 700;
}

/* ========================================
   Subjects Grid
   ======================================== */
.subjects-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
}

.subject-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    text-align: center;
    transition: var(--transition);
    position: relative;
}

.subject-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow);
}

.subject-card.tyt {
    border-top: 3px solid var(--accent);
}

.subject-card.ayt {
    border-top: 3px solid var(--success);
}

.subject-tag {
    position: absolute;
    top: 10px;
    right: 10px;
    font-size: 11px;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: 4px;
    background: rgba(108, 92, 231, 0.15);
    color: var(--accent-light);
}

.subject-card.ayt .subject-tag {
    background: rgba(0, 184, 148, 0.15);
    color: var(--success);
}

.subject-card h3 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 4px;
}

.subject-card p {
    font-size: 13px;
    color: var(--text-muted);
}

/* ========================================
   CTA Section
   ======================================== */
.cta-section {
    padding: 60px 0;
}

.cta-box {
    background: var(--gradient-primary);
    border-radius: var(--radius-lg);
    padding: 60px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.cta-box::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(255,255,255,0.1), transparent 70%);
    border-radius: 50%;
}

.cta-box h2 {
    font-size: 36px;
    font-weight: 800;
    margin-bottom: 12px;
    position: relative;
}

.cta-box p {
    font-size: 18px;
    opacity: 0.9;
    margin-bottom: 32px;
    position: relative;
}

.cta-box .btn {
    position: relative;
    background: white;
    color: var(--accent-dark);
    font-weight: 700;
}

.cta-box .btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(0,0,0,0.2);
}

/* ========================================
   Page Header
   ======================================== */
.page-header {
    background: var(--gradient-hero);
    padding: 100px 0 60px;
    text-align: center;
    position: relative;
}

.page-header::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 60px;
    background: linear-gradient(to bottom, transparent, var(--bg-primary));
}

.page-header h1 {
    font-size: 44px;
    font-weight: 800;
    margin-bottom: 12px;
}

.page-header p {
    font-size: 18px;
    color: var(--text-secondary);
}

/* ========================================
   Feature Detail (Özellikler Sayfası)
   ======================================== */
.feature-detail {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    padding: 60px 0;
    border-bottom: 1px solid var(--border);
}

.feature-detail:last-child {
    border-bottom: none;
}

.feature-detail.reverse {
    direction: rtl;
}

.feature-detail.reverse > * {
    direction: ltr;
}

.feature-detail-badge {
    display: inline-block;
    font-size: 48px;
    font-weight: 900;
    color: var(--accent);
    opacity: 0.3;
    margin-bottom: 12px;
}

.feature-detail h2 {
    font-size: 32px;
    font-weight: 800;
    margin-bottom: 16px;
}

.feature-detail > .feature-detail-content > p {
    font-size: 17px;
    color: var(--text-secondary);
    margin-bottom: 24px;
    line-height: 1.7;
}

.feature-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.feature-list li {
    font-size: 15px;
    color: var(--text-secondary);
}

/* Mock UI Elements */
.mock-leaderboard, .mock-stats, .mock-exam, .mock-challenge, .mock-group, .mock-form, .mock-profile, .mock-quiz, .mock-ranking, .mock-social {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 24px;
}

.mock-lb-header, .mock-exam-header, .mock-challenge-header, .mock-group-header, .mock-form-title, .mock-social-header {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border);
}

.mock-lb-item {
    padding: 10px 14px;
    border-radius: 8px;
    margin-bottom: 6px;
    font-size: 14px;
    font-weight: 500;
    background: var(--bg-secondary);
    display: flex;
    justify-content: space-between;
}

.mock-lb-item.gold { border-left: 3px solid var(--gold); }
.mock-lb-item.silver { border-left: 3px solid var(--silver); }
.mock-lb-item.bronze { border-left: 3px solid var(--bronze); }
.mock-lb-item.highlight { border-left: 3px solid var(--accent); background: rgba(108,92,231,0.1); }

/* Stats Mock */
.mock-stat-bar {
    margin-bottom: 14px;
}

.mock-stat-bar span {
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 6px;
    display: block;
}

.bar {
    height: 24px;
    background: var(--bg-secondary);
    border-radius: 12px;
    overflow: hidden;
}

.bar-fill {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    padding-right: 10px;
    font-size: 12px;
    font-weight: 700;
    color: white;
    transition: width 1s ease;
}

/* Exam Mock */
.mock-exam-info {
    display: flex;
    gap: 20px;
    margin-bottom: 16px;
    font-size: 14px;
    color: var(--text-secondary);
}

.progress-bar {
    height: 12px;
    background: var(--bg-secondary);
    border-radius: 6px;
    overflow: hidden;
    margin-bottom: 8px;
}

.progress-fill {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: 6px;
}

.mock-exam-progress span {
    font-size: 13px;
    color: var(--text-muted);
}

/* Challenge Mock */
.mock-challenge-title {
    font-size: 20px;
    font-weight: 700;
    margin: 12px 0;
}

.mock-challenge-timer {
    font-size: 24px;
    font-weight: 800;
    color: var(--accent-light);
    margin-bottom: 12px;
}

.mock-challenge-reward {
    font-size: 16px;
    color: var(--warning);
    font-weight: 600;
}

/* Group Mock */
.mock-group-members {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-top: 12px;
}

.mock-member {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 14px;
    background: var(--bg-secondary);
    border-radius: 8px;
    font-size: 14px;
}

.mock-member.highlight {
    border: 1px solid var(--accent);
    background: rgba(108,92,231,0.1);
}

.rank-badge {
    font-size: 12px;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: 4px;
    background: var(--bg-card);
}

.rank-badge.gold { background: rgba(255,215,0,0.2); color: var(--gold); }
.rank-badge.silver { background: rgba(192,192,192,0.2); color: var(--silver); }

/* Form Mock */
.mock-form-field {
    padding: 10px 0;
    font-size: 14px;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border);
}

.mock-input, .mock-select {
    display: inline-block;
    background: var(--bg-secondary);
    padding: 4px 10px;
    border-radius: 6px;
    color: var(--text-primary);
    font-size: 13px;
}

.mock-form-btn {
    margin-top: 16px;
    text-align: center;
    padding: 10px;
    background: var(--gradient-primary);
    border-radius: 8px;
    font-weight: 600;
    font-size: 14px;
}

/* Profile Mock */
.mock-profile {
    text-align: center;
}

.mock-avatar {
    width: 60px;
    height: 60px;
    background: var(--bg-secondary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    margin: 0 auto 12px;
}

.mock-profile-name {
    font-weight: 700;
    margin-bottom: 4px;
}

.mock-profile-badge {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.mock-profile-goal {
    font-size: 14px;
    color: var(--warning);
    font-weight: 600;
}

/* Quiz Mock */
.mock-quiz-header {
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 12px;
}

.mock-quiz-question {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 16px;
    line-height: 1.5;
}

.mock-quiz-options {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.mock-option {
    padding: 10px 14px;
    background: var(--bg-secondary);
    border-radius: 8px;
    font-size: 14px;
    border: 1px solid var(--border);
}

.mock-option.selected {
    border-color: var(--success);
    background: rgba(0,184,148,0.1);
}

/* Ranking Mock */
.mock-rank-tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 16px;
}

.mock-rank-tabs span {
    padding: 6px 12px;
    background: var(--bg-secondary);
    border-radius: 6px;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
}

.mock-rank-tabs span.active {
    background: var(--accent);
    color: white;
}

.mock-rank-mini {
    display: flex;
    flex-direction: column;
    gap: 6px;
    font-size: 14px;
}

.mock-rank-mini div {
    padding: 8px 12px;
    background: var(--bg-secondary);
    border-radius: 6px;
}

/* Social Mock */
.mock-invite {
    text-align: center;
    margin-top: 12px;
}

.mock-invite-link {
    background: var(--bg-secondary);
    padding: 8px 14px;
    border-radius: 6px;
    font-size: 13px;
    color: var(--accent-light);
    margin-top: 8px;
    font-family: monospace;
}

/* ========================================
   Guide Steps (Nasıl Çalışır)
   ======================================== */
.guide-steps {
    display: flex;
    flex-direction: column;
    gap: 48px;
}

.guide-step {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.guide-step-header {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 24px 32px;
    background: var(--bg-elevated);
    border-bottom: 1px solid var(--border);
}

.guide-step-num {
    width: 48px;
    height: 48px;
    background: var(--gradient-primary);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    font-weight: 800;
    flex-shrink: 0;
}

.guide-step-header h2 {
    font-size: 24px;
    font-weight: 700;
}

.guide-step-body {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    padding: 32px;
}

.guide-step-content h4 {
    font-size: 16px;
    font-weight: 600;
    margin: 16px 0 10px;
}

.guide-step-content ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.guide-step-content li {
    font-size: 15px;
    color: var(--text-secondary);
}

/* ========================================
   Download Section
   ======================================== */
.download-section {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 40px;
}

.download-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 48px;
    text-align: center;
    margin-bottom: 32px;
}

.download-icon {
    font-size: 64px;
    margin-bottom: 16px;
}

.download-card h2 {
    font-size: 28px;
    font-weight: 800;
    margin-bottom: 8px;
}

.download-version {
    color: var(--text-muted);
    font-size: 14px;
    margin-bottom: 4px;
}

.download-size {
    color: var(--text-muted);
    font-size: 14px;
    margin-bottom: 24px;
}

.download-btn {
    font-size: 20px !important;
    padding: 20px 48px !important;
}

.download-note {
    margin-top: 16px;
    font-size: 13px;
    color: var(--text-muted);
}

.install-guide {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 32px;
}

.install-guide h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 20px;
}

.install-steps {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.install-step {
    display: flex;
    gap: 16px;
    align-items: flex-start;
}

.install-step-num {
    width: 32px;
    height: 32px;
    background: var(--gradient-primary);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 800;
    flex-shrink: 0;
}

.install-step h4 {
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 4px;
}

.install-step p {
    font-size: 14px;
    color: var(--text-secondary);
}

/* Sidebar */
.system-requirements, .faq-box, .about-stats-card, .about-team-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 28px;
    margin-bottom: 24px;
}

.system-requirements h3, .faq-box h3, .about-stats-card h3, .about-team-card h3 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 16px;
}

.system-requirements ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.system-requirements li {
    font-size: 14px;
    color: var(--text-secondary);
    padding: 8px 12px;
    background: var(--bg-secondary);
    border-radius: 8px;
}

.faq-item {
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
}

.faq-item:last-child {
    border-bottom: none;
}

.faq-item h4 {
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 6px;
}

.faq-item p {
    font-size: 14px;
    color: var(--text-secondary);
}

/* ========================================
   About Page
   ======================================== */
.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 40px;
}

.about-mission, .about-vision, .about-story, .about-values {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 32px;
    margin-bottom: 24px;
}

.about-mission h2, .about-vision h2, .about-story h2, .about-values h2 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 16px;
}

.about-mission p, .about-vision p, .about-story p {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 12px;
}

.values-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.value-card {
    background: var(--bg-secondary);
    border-radius: var(--radius);
    padding: 20px;
    text-align: center;
}

.value-icon {
    font-size: 32px;
    margin-bottom: 10px;
}

.value-card h3 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 6px;
}

.value-card p {
    font-size: 13px;
    color: var(--text-muted);
}

.about-stat {
    text-align: center;
    padding: 16px 0;
    border-bottom: 1px solid var(--border);
}

.about-stat:last-child {
    border-bottom: none;
}

.about-stat-num {
    display: block;
    font-size: 28px;
    font-weight: 800;
    color: var(--accent-light);
}

.about-stat-label {
    font-size: 13px;
    color: var(--text-muted);
}

.about-team-card p {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ========================================
   Contact Page
   ======================================== */
.contact-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 40px;
}

.contact-form-section h2 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 24px;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.form-group label {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-secondary);
}

.form-group input,
.form-group select,
.form-group textarea {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 12px 16px;
    color: var(--text-primary);
    font-size: 15px;
    font-family: inherit;
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(108, 92, 231, 0.15);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.contact-info-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 28px;
    margin-bottom: 20px;
}

.contact-info-card h3 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 16px;
}

.contact-info-item {
    display: flex;
    gap: 14px;
    align-items: flex-start;
    margin-bottom: 16px;
}

.contact-info-item:last-child {
    margin-bottom: 0;
}

.contact-info-icon {
    font-size: 20px;
    flex-shrink: 0;
}

.contact-info-item strong {
    display: block;
    font-size: 14px;
    margin-bottom: 2px;
}

.contact-info-item p {
    font-size: 14px;
    color: var(--text-secondary);
}

.social-contact-links {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.social-contact-link {
    display: block;
    padding: 10px 14px;
    background: var(--bg-secondary);
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    transition: var(--transition);
}

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

.contact-info-card p {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.contact-note {
    font-size: 13px;
    color: var(--text-muted);
    font-style: italic;
    margin-top: 8px;
}

/* ========================================
   Footer
   ======================================== */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    padding: 60px 0 30px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-col h4 {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 16px;
}

.footer-col p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.footer-col ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.footer-col a {
    font-size: 14px;
    color: var(--text-secondary);
}

.footer-col a:hover {
    color: var(--accent-light);
}

.social-links {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.social-link {
    font-size: 14px;
    color: var(--text-secondary);
}

.social-link:hover {
    color: var(--accent-light);
}

.footer-bottom {
    border-top: 1px solid var(--border);
    padding-top: 24px;
    text-align: center;
}

.footer-bottom p {
    font-size: 13px;
    color: var(--text-muted);
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 1024px) {
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-desc {
        margin: 0 auto 32px;
    }

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

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

    .hero-visual {
        display: none;
    }

    .hero h1 {
        font-size: 40px;
    }

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

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

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

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--bg-secondary);
        flex-direction: column;
        padding: 20px;
        border-bottom: 1px solid var(--border);
    }

    .nav-links.active {
        display: flex;
    }

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

    .hero h1 {
        font-size: 32px;
    }

    .hero-stats {
        flex-direction: column;
        gap: 20px;
    }

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

    .steps-grid {
        flex-direction: column;
    }

    .step-connector {
        transform: rotate(90deg);
    }

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

    .feature-detail,
    .feature-detail.reverse {
        grid-template-columns: 1fr;
        direction: ltr;
    }

    .guide-step-body {
        grid-template-columns: 1fr;
    }

    .download-section {
        grid-template-columns: 1fr;
    }

    .about-content {
        grid-template-columns: 1fr;
    }

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

    .form-row {
        grid-template-columns: 1fr;
    }

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

    .section-header h2 {
        font-size: 30px;
    }

    .page-header h1 {
        font-size: 32px;
    }

    .cta-box {
        padding: 40px 24px;
    }

    .cta-box h2 {
        font-size: 28px;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 40px 0 60px;
    }

    .hero h1 {
        font-size: 28px;
    }

    .hero-desc {
        font-size: 16px;
    }

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

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