:root {
    --bg-primary: #0a0e17;
    --bg-secondary: #111827;
    --bg-card: #1a2332;
    --bg-card-hover: #1f2b3d;
    --bg-nav: rgba(10, 14, 23, 0.95);
    --text-primary: #e2e8f0;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --accent: #3776ab;
    --accent-dim: #2a5f86;
    --accent-glow: rgba(55, 118, 171, 0.15);
    --accent-blue: #4b8bbe;
    --accent-purple: #8b5cf6;
    --accent-red: #ef4444;
    --accent-orange: #f59e0b;
    --accent-cyan: #ffd43b;
    --border: #1e293b;
    --border-light: #334155;
    --gradient-start: #3776ab;
    --gradient-end: #ffd43b;
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
    --radius: 12px;
    --radius-sm: 10px;
    --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: 'Inter', -apple-system, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    overflow-x: hidden;
}

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

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

code {
    font-family: 'JetBrains Mono', monospace;
    background: rgba(55, 118, 171, 0.1);
    color: var(--accent);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.85em;
}

pre {
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 20px;
    overflow-x: auto;
    margin: 16px 0;
}

pre code {
    background: none;
    padding: 0;
    color: var(--text-primary);
    font-size: 0.85em;
    line-height: 1.8;
}

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

/* ===== NAVBAR ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: var(--bg-nav);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    transition: var(--transition);
}

.navbar.scrolled {
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.5);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    font-size: 1.3rem;
    color: var(--text-primary) !important;
}

.logo-icon {
    font-family: 'JetBrains Mono', monospace;
    background: linear-gradient(135deg, var(--accent), var(--accent-blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    font-size: 1.5rem;
    font-weight: 700;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-link {
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    color: var(--text-secondary) !important;
    font-weight: 500;
    font-size: 0.9rem;
    transition: var(--transition);
}

.nav-link:hover, .nav-link.active {
    color: var(--text-primary) !important;
    background: rgba(255, 255, 255, 0.05);
}

.nav-dropdown {
    position: relative;
}

.dropdown-content {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    min-width: 200px;
    box-shadow: var(--shadow);
    overflow: hidden;
}

.nav-dropdown:hover .dropdown-content {
    display: block;
}

.dropdown-content a {
    display: block;
    padding: 10px 16px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.dropdown-content a:hover {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
}

.nav-search {
    position: relative;
}

.nav-search input {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    color: var(--text-primary);
    padding: 8px 16px;
    border-radius: 20px;
    width: 220px;
    font-size: 0.85rem;
    outline: none;
    transition: var(--transition);
}

.nav-search input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
    width: 280px;
}

.search-results {
    display: none;
    position: absolute;
    top: 100%;
    right: 0;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    width: 350px;
    max-height: 400px;
    overflow-y: auto;
    box-shadow: var(--shadow);
}

.search-results.active {
    display: block;
}

.search-result-item {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border);
    cursor: pointer;
    transition: var(--transition);
}

.search-result-item:hover {
    background: var(--bg-card);
}

.search-result-item h4 {
    font-size: 0.9rem;
    color: var(--text-primary);
}

.search-result-item p {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.search-result-item .search-tag {
    font-size: 0.7rem;
    background: var(--accent-glow);
    color: var(--accent);
    padding: 2px 8px;
    border-radius: 10px;
    margin-left: 8px;
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.hamburger span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: var(--transition);
}

/* ===== HERO ===== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    padding: 120px 24px 80px;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.matrix-rain {
    position: absolute;
    inset: 0;
    opacity: 0.15;
}

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

.hero-badge {
    display: inline-block;
    background: var(--accent-glow);
    color: var(--accent);
    padding: 6px 20px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 24px;
    border: 1px solid rgba(55, 118, 171, 0.2);
}

.hero-title {
    font-size: clamp(2.5rem, 7vw, 5rem);
    font-weight: 900;
    line-height: 1.1;
    margin-bottom: 24px;
    letter-spacing: -0.02em;
}

.highlight {
    background: linear-gradient(135deg, var(--accent), var(--accent-blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    position: relative;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 650px;
    margin: 0 auto 48px;
    line-height: 1.8;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 48px;
    margin-bottom: 48px;
    flex-wrap: wrap;
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--accent);
    font-family: 'JetBrains Mono', monospace;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

/* ===== BUTTONS ===== */
.btn {
    display: inline-flex;
    align-items: center;
    padding: 14px 32px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    font-family: inherit;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent), var(--accent-dim));
    color: var(--bg-primary);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(55, 118, 171, 0.3);
    color: var(--bg-primary);
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--border-light);
    color: var(--text-primary);
}

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

.btn-sm {
    padding: 8px 20px;
    font-size: 0.85rem;
}

/* ===== SECTIONS ===== */
.section {
    padding: 100px 24px;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
}

.section-title {
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    font-weight: 800;
    text-align: center;
    margin-bottom: 16px;
    letter-spacing: -0.01em;
}

.section-desc {
    text-align: center;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 48px;
    font-size: 1.05rem;
}

/* ===== INSTALL ===== */
.install-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
    margin-bottom: 48px;
}

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

.install-card:hover {
    border-color: var(--accent);
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

.install-icon {
    font-size: 2.5rem;
    margin-bottom: 16px;
}

.install-card h3 {
    font-size: 1.3rem;
    margin-bottom: 12px;
    font-weight: 700;
}

.install-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 20px;
}

.install-steps {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.step {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.step-num {
    background: var(--accent-glow);
    color: var(--accent);
    width: 24px;
    height: 24px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 700;
    flex-shrink: 0;
    font-family: 'JetBrains Mono', monospace;
}

.first-steps-box {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px;
}

.first-steps-box h3 {
    margin-bottom: 16px;
    font-size: 1.2rem;
}

.first-steps-box pre {
    margin: 0;
}

/* ===== LEVEL HEADER ===== */
.level-header {
    text-align: center;
    margin-bottom: 48px;
}

.level-badge {
    display: inline-block;
    padding: 6px 20px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 16px;
}

.badge-beginner {
    background: rgba(34, 197, 94, 0.15);
    color: #22c55e;
    border: 1px solid rgba(34, 197, 94, 0.3);
}

.badge-intermediate {
    background: rgba(245, 158, 11, 0.15);
    color: #f59e0b;
    border: 1px solid rgba(245, 158, 11, 0.3);
}

.badge-expert {
    background: rgba(239, 68, 68, 0.15);
    color: #ef4444;
    border: 1px solid rgba(239, 68, 68, 0.3);
}

.section-level {
    position: relative;
}

.section-level::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
}

#debutant::before {
    background: linear-gradient(90deg, transparent, #22c55e, transparent);
}

#intermediaire::before {
    background: linear-gradient(90deg, transparent, #f59e0b, transparent);
}

#expert::before {
    background: linear-gradient(90deg, transparent, #ef4444, transparent);
}

/* ===== COURSE GRID ===== */
.course-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 24px;
}

.course-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.course-card:hover {
    border-color: var(--accent);
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

.course-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.course-icon {
    font-size: 2rem;
}

.course-tag {
    font-size: 0.75rem;
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-muted);
    padding: 4px 12px;
    border-radius: 12px;
    font-weight: 500;
}

.course-card h3 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 10px;
}

.course-card > p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 16px;
}

.course-topics {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 20px;
}

.topic {
    font-size: 0.75rem;
    background: rgba(55, 118, 171, 0.08);
    color: var(--accent);
    padding: 3px 10px;
    border-radius: 10px;
    border: 1px solid rgba(55, 118, 171, 0.15);
}

.lesson-list {
    flex: 1;
    margin-bottom: 20px;
}

.lesson {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    transition: var(--transition);
    cursor: pointer;
}

.lesson:hover {
    background: rgba(255, 255, 255, 0.03);
    color: var(--text-primary);
}

.lesson-check {
    color: var(--accent);
    font-weight: 700;
    width: 24px;
    text-align: center;
}

.lesson-num {
    color: var(--text-muted);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    width: 24px;
    text-align: center;
}

/* ===== TOOLS SECTION ===== */
.tool-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
    margin-bottom: 40px;
}

.filter-btn {
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    padding: 8px 18px;
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 500;
    transition: var(--transition);
    font-family: inherit;
}

.filter-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.filter-btn.active {
    background: var(--accent-glow);
    border-color: var(--accent);
    color: var(--accent);
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 20px;
}

.tool-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    transition: var(--transition);
}

.tool-card.hidden {
    display: none;
}

.tool-card:hover {
    border-color: var(--accent);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.2);
}

.tool-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.tool-header h3 {
    font-size: 1.1rem;
    font-weight: 700;
}

.tool-level {
    font-size: 0.7rem;
    padding: 3px 10px;
    border-radius: 10px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.level-beginner {
    background: rgba(34, 197, 94, 0.15);
    color: #22c55e;
}

.level-intermediate {
    background: rgba(245, 158, 11, 0.15);
    color: #f59e0b;
}

.level-expert {
    background: rgba(239, 68, 68, 0.15);
    color: #ef4444;
}

.tool-card > p {
    color: var(--text-secondary);
    font-size: 0.88rem;
    margin-bottom: 14px;
    line-height: 1.6;
}

.tool-commands {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-bottom: 14px;
}

.tool-commands code {
    display: block;
    background: var(--bg-primary);
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 0.8rem;
    border: 1px solid var(--border);
    white-space: pre;
    overflow-x: auto;
}

.tool-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.tool-tags span {
    font-size: 0.7rem;
    background: rgba(255, 255, 255, 0.04);
    color: var(--text-muted);
    padding: 3px 8px;
    border-radius: 6px;
}

/* ===== LABS ===== */
.labs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
    gap: 24px;
    margin-bottom: 48px;
}

.lab-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px;
    transition: var(--transition);
}

.lab-card:hover {
    border-color: var(--accent);
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

.lab-difficulty {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 10px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    margin-bottom: 14px;
}

.lab-difficulty.beginner {
    background: rgba(34, 197, 94, 0.15);
    color: #22c55e;
}

.lab-difficulty.intermediate {
    background: rgba(245, 158, 11, 0.15);
    color: #f59e0b;
}

.lab-difficulty.expert {
    background: rgba(239, 68, 68, 0.15);
    color: #ef4444;
}

.lab-card h3 {
    font-size: 1.15rem;
    margin-bottom: 10px;
}

.lab-card > p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 16px;
}

.lab-tools {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 16px;
}

.lab-tools span {
    font-size: 0.75rem;
    background: var(--accent-glow);
    color: var(--accent);
    padding: 3px 10px;
    border-radius: 10px;
}

.lab-meta {
    display: flex;
    gap: 16px;
    color: var(--text-muted);
    font-size: 0.85rem;
}

.lab-resources h3 {
    text-align: center;
    margin-bottom: 24px;
    font-size: 1.3rem;
}

.resource-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 16px;
}

.resource-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    transition: var(--transition);
    display: block;
}

.resource-card:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
}

.resource-card h4 {
    color: var(--accent);
    margin-bottom: 8px;
    font-size: 1.1rem;
}

.resource-card p {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

/* ===== QUIZ ===== */
.quiz-selector {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 32px;
}

.quiz-tab {
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    padding: 10px 20px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition);
    font-family: inherit;
}

.quiz-tab:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.quiz-tab.active {
    background: var(--accent-glow);
    border-color: var(--accent);
    color: var(--accent);
}

.quiz-container {
    max-width: 800px;
    margin: 0 auto;
}

.quiz-question {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px;
    margin-bottom: 20px;
}

.quiz-question h3 {
    font-size: 1.1rem;
    margin-bottom: 20px;
    line-height: 1.6;
}

.quiz-question h3 .q-num {
    color: var(--accent);
    font-family: 'JetBrains Mono', monospace;
    margin-right: 8px;
}

.quiz-options {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.quiz-option {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.9rem;
}

.quiz-option:hover {
    border-color: var(--accent);
    background: rgba(55, 118, 171, 0.03);
}

.quiz-option.selected {
    border-color: var(--accent-blue);
    background: rgba(59, 130, 246, 0.1);
}

.quiz-option.correct {
    border-color: #22c55e;
    background: rgba(34, 197, 94, 0.1);
    color: #22c55e;
}

.quiz-option.incorrect {
    border-color: #ef4444;
    background: rgba(239, 68, 68, 0.1);
    color: #ef4444;
}

.quiz-option input {
    display: none;
}

.quiz-option .option-letter {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    border: 1px solid var(--border-light);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    font-weight: 600;
    flex-shrink: 0;
    font-family: 'JetBrains Mono', monospace;
}

.quiz-option.correct .option-letter {
    border-color: #22c55e;
    background: #22c55e;
    color: var(--bg-primary);
}

.quiz-option.incorrect .option-letter {
    border-color: #ef4444;
    background: #ef4444;
    color: white;
}

.quiz-explanation {
    margin-top: 12px;
    padding: 12px 16px;
    background: rgba(59, 130, 246, 0.08);
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    color: var(--text-secondary);
    border-left: 3px solid var(--accent-blue);
    display: none;
}

.quiz-explanation.visible {
    display: block;
}

.quiz-submit {
    text-align: center;
    margin-top: 32px;
}

.quiz-score {
    text-align: center;
    max-width: 400px;
    margin: 40px auto;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 48px 32px;
}

.score-circle {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    border: 4px solid var(--accent);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 24px auto;
}

.score-value {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--accent);
    font-family: 'JetBrains Mono', monospace;
}

#scoreMessage {
    color: var(--text-secondary);
    margin-bottom: 24px;
}

/* ===== RESOURCES ===== */
.resources-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 32px;
}

.resource-section h3 {
    font-size: 1.2rem;
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border);
}

.resource-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.resource-list li {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.5;
}

.resource-list li strong {
    color: var(--text-primary);
}

.resource-list a {
    color: var(--accent);
}

.resource-list a:hover {
    text-decoration: underline;
}

/* ===== FOOTER ===== */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    padding: 60px 24px 30px;
}

.footer-grid {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-col .logo-icon {
    font-size: 1.3rem;
}

.footer-col .logo-text {
    font-weight: 800;
    font-size: 1.2rem;
}

.footer-col > p {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-top: 12px;
}

.footer-col h4 {
    font-size: 1rem;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.footer-col a {
    display: block;
    color: var(--text-muted);
    font-size: 0.9rem;
    padding: 4px 0;
    transition: var(--transition);
}

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

.legal-text {
    color: var(--text-muted);
    font-size: 0.85rem;
    line-height: 1.6;
    background: rgba(59, 130, 246, 0.05);
    padding: 12px;
    border-radius: var(--radius-sm);
    border: 1px solid rgba(59, 130, 246, 0.15);
}

.footer-bottom {
    text-align: center;
    padding-top: 24px;
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 0.85rem;
    max-width: 1400px;
    margin: 0 auto;
}

/* ===== MODAL ===== */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(8px);
    z-index: 2000;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 24px;
}

.modal-overlay.active {
    display: flex;
}

.modal {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    width: 100%;
    max-width: 900px;
    max-height: 85vh;
    overflow-y: auto;
    position: relative;
}

.modal-close {
    position: sticky;
    top: 16px;
    float: right;
    margin: 16px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text-primary);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    z-index: 1;
}

.modal-close:hover {
    background: var(--accent-red);
    border-color: var(--accent-red);
}

.modal-content {
    padding: 40px;
}

.modal-content h2 {
    font-size: 1.8rem;
    margin-bottom: 24px;
}

.modal-content h3 {
    font-size: 1.2rem;
    margin: 24px 0 12px;
    color: var(--accent);
}

.modal-content p {
    color: var(--text-secondary);
    margin-bottom: 12px;
    line-height: 1.7;
}

.modal-content ul {
    padding-left: 24px;
    margin-bottom: 16px;
}

.modal-content li {
    color: var(--text-secondary);
    margin-bottom: 8px;
    line-height: 1.6;
}

.modal-content .lab-note {
    background: rgba(59, 130, 246, 0.08);
    border: 1px solid rgba(59, 130, 246, 0.2);
    border-radius: var(--radius-sm);
    padding: 16px;
    margin: 16px 0;
    font-size: 0.9rem;
}

.modal-content .warning {
    background: rgba(239, 68, 68, 0.08);
    border: 1px solid rgba(239, 68, 68, 0.2);
    border-radius: var(--radius-sm);
    padding: 16px;
    margin: 16px 0;
    font-size: 0.9rem;
    border-left: 3px solid var(--accent-red);
}

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-light);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: var(--bg-nav);
        flex-direction: column;
        padding: 24px;
        gap: 8px;
        transform: translateY(-100%);
        opacity: 0;
        pointer-events: none;
        transition: var(--transition);
        border-bottom: 1px solid var(--border);
    }

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

    .hamburger {
        display: flex;
    }

    .nav-search {
        display: none;
    }

    .hero-stats {
        gap: 24px;
    }

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

    .course-grid, .tools-grid, .labs-grid {
        grid-template-columns: 1fr;
    }

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

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }

    .tool-filters {
        gap: 6px;
    }

    .filter-btn {
        padding: 6px 12px;
        font-size: 0.8rem;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .section {
        padding: 60px 16px;
    }
}

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

@keyframes glow {
    0%, 100% {
        box-shadow: 0 0 20px rgba(55, 118, 171, 0.1);
    }
    50% {
        box-shadow: 0 0 40px rgba(55, 118, 171, 0.2);
    }
}

.animate-in {
    animation: fadeInUp 0.6s ease forwards;
}

/* ===== PROGRESS BAR ===== */
.progress-bar {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--bg-secondary);
    z-index: 999;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent), var(--accent-blue));
    width: 0%;
    transition: width 0.1s linear;
}

/* ===== BACK TO TOP ===== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    background: var(--accent);
    color: var(--bg-primary);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.2rem;
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 999;
    transition: var(--transition);
    box-shadow: 0 4px 20px rgba(55, 118, 171, 0.3);
}

.back-to-top.visible {
    display: flex;
}

.back-to-top:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 30px rgba(55, 118, 171, 0.4);
}

/* =====================================================================
   TERMINAL INTERACTIF + COACH + MISSIONS
   ===================================================================== */
.section-term { }
.term-header-row { display: flex; align-items: flex-end; justify-content: space-between; flex-wrap: wrap; gap: 16px; margin-bottom: 24px; }
.xp-chip { background: linear-gradient(135deg, var(--accent), var(--accent-blue)); color: var(--bg-primary); font-weight: 800; padding: 8px 18px; border-radius: 999px; font-size: 0.95rem; box-shadow: 0 4px 18px var(--accent-glow); }

.term-layout { display: grid; grid-template-columns: 1fr 360px; gap: 20px; align-items: start; }

.term-main { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.term-host { width: 100%; }
.term-placeholder { padding: 40px; text-align: center; color: var(--text-secondary); font-family: 'JetBrains Mono', monospace; }

.term-topbar { display: flex; align-items: center; gap: 8px; padding: 10px 14px; border-bottom: 1px solid var(--border); background: var(--bg-secondary); }
.term-topbar .dot { width: 12px; height: 12px; border-radius: 50%; display: inline-block; }
.dot-red { background: #ff5f57; } .dot-yellow { background: #febc2e; } .dot-green { background: #28c840; }
.term-mode { flex: 1; text-align: center; color: var(--accent); font-weight: 600; font-size: 0.8rem; letter-spacing: 0.5px; text-transform: uppercase; }
.term-reset { background: transparent; border: 1px solid var(--border-light); color: var(--text-secondary); border-radius: 6px; padding: 3px 10px; font-size: 0.75rem; cursor: pointer; }
.term-reset:hover { color: var(--accent); border-color: var(--accent); }
.xterm-wrap { padding: 8px; height: 460px; }
.xterm-wrap .xterm { height: 100%; }
.term-boot { padding: 40px; text-align: center; color: var(--accent-cyan); font-family: 'JetBrains Mono', monospace; }

.term-quickstart { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-top: 20px; }
.qs-label { color: var(--text-secondary); font-size: 0.9rem; font-weight: 600; }
.qs-chip { background: var(--bg-card); border: 1px solid var(--border-light); color: var(--accent-cyan); font-family: 'JetBrains Mono', monospace; font-size: 0.8rem; border-radius: 999px; padding: 6px 14px; cursor: pointer; transition: var(--transition); }
.qs-chip:hover { background: var(--accent-glow); border-color: var(--accent); color: var(--accent); }

/* --- Side (coach + missions) --- */
.term-side { display: flex; flex-direction: column; gap: 16px; min-width: 0; }

.coach-zone .coach-panel { position: static; width: 100%; max-height: none; border-radius: var(--radius); }
.coach-panel { position: fixed; right: 20px; bottom: 20px; width: 340px; max-height: 60vh; background: var(--bg-secondary); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: 0 12px 40px rgba(0,0,0,0.5); overflow: hidden; z-index: 999; font-family: 'Inter', sans-serif; }
.coach-head { display: flex; align-items: center; gap: 8px; padding: 12px 16px; background: var(--bg-card); border-bottom: 1px solid var(--border); cursor: pointer; user-select: none; }
.coach-title { font-weight: 700; font-size: 0.95rem; }
.coach-count { flex: 1; text-align: right; color: var(--text-secondary); font-size: 0.75rem; }
.coach-chev { color: var(--text-secondary); font-size: 0.8rem; transition: transform 0.2s; }
.coach-panel.coach-collapsed .coach-chev { transform: rotate(-90deg); }
.coach-panel.coach-collapsed .coach-body { display: none; }
.coach-body { padding: 12px; max-height: 40vh; overflow-y: auto; display: flex; flex-direction: column; gap: 10px; }
.coach-card { display: flex; gap: 10px; padding: 10px 12px; border-radius: var(--radius-sm); border: 1px solid var(--border); background: var(--bg-card); animation: coach-in 0.25s ease; }
.coach-card-icon { font-size: 1.2rem; line-height: 1.3; }
.coach-card-text { font-size: 0.82rem; line-height: 1.45; }
.coach-card-label { font-weight: 700; margin-bottom: 2px; font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.4px; }
.coach-error { border-color: rgba(239,68,68,0.4); background: rgba(239,68,68,0.08); }
.coach-error .coach-card-label { color: var(--accent-red); }
.coach-hint { border-color: rgba(245,158,11,0.4); background: rgba(245,158,11,0.08); }
.coach-hint .coach-card-label { color: var(--accent-orange); }
.coach-success { border-color: rgba(4,159,217,0.4); background: rgba(4,159,217,0.08); }
.coach-success .coach-card-label { color: var(--accent); }
.coach-info .coach-card-label { color: var(--accent-cyan); }
@keyframes coach-in { from { opacity: 0; transform: translateY(-6px); } to { opacity: 1; transform: none; } }

.coach-inline { display: block; }
.coach-inline .coach-body { max-height: 300px; }

/* --- Missions --- */
.missions-zone { }
.missions-header { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius) var(--radius) 0 0; padding: 14px 16px; }
.missions-titleline { display: flex; align-items: center; justify-content: space-between; margin-bottom: 8px; }
.missions-grad { background: linear-gradient(135deg, var(--accent), var(--accent-blue)); -webkit-background-clip: text; background-clip: text; color: transparent; font-weight: 900; letter-spacing: 1px; font-size: 1.05rem; }
.missions-count { background: var(--accent-glow); color: var(--accent); font-weight: 700; font-size: 0.8rem; border-radius: 999px; padding: 2px 12px; }
.missions-ranklabel { color: var(--text-secondary); font-size: 0.78rem; margin-bottom: 10px; }
.missions-progress { height: 8px; background: var(--bg-secondary); border-radius: 999px; overflow: hidden; }
.missions-bar { height: 100%; }
.missions-bar-inner { height: 100%; width: 0%; background: linear-gradient(90deg, var(--accent), var(--accent-blue)); border-radius: 999px; transition: width 0.5s ease; }
.missions-body { background: var(--bg-secondary); border: 1px solid var(--border); border-top: none; border-radius: 0 0 var(--radius) var(--radius); padding: 8px 16px 16px; max-height: 420px; overflow-y: auto; }
.mission-chapter { margin: 10px 0 6px; }
.mission-chapter-title { display: flex; justify-content: space-between; font-weight: 700; font-size: 0.82rem; text-transform: uppercase; letter-spacing: 0.5px; color: var(--accent-purple); margin-bottom: 6px; }
.mission-chapter-count { color: var(--text-secondary); font-weight: 600; }
.mission-item { display: flex; gap: 10px; align-items: flex-start; padding: 8px 8px; border-radius: var(--radius-sm); transition: var(--transition); }
.mission-item:hover { background: var(--bg-card); }
.mission-ico { font-size: 1rem; margin-top: 2px; }
.mission-info { flex: 1; min-width: 0; }
.mission-title { font-weight: 600; font-size: 0.85rem; color: var(--text-primary); }
.mission-done .mission-title { color: var(--text-secondary); text-decoration: line-through; }
.mission-desc { font-size: 0.76rem; color: var(--text-secondary); line-height: 1.4; }
.mission-xp { font-size: 0.76rem; color: var(--accent); font-weight: 700; white-space: nowrap; }

/* Toasts de mission */
.missions-toasts { position: fixed; top: 90px; right: 20px; display: flex; flex-direction: column; gap: 10px; z-index: 1000; }
.mission-toast { display: flex; gap: 12px; align-items: center; background: var(--bg-secondary); border: 1px solid var(--accent); border-radius: var(--radius-sm); padding: 12px 16px; box-shadow: 0 8px 30px rgba(0,0,0,0.4); animation: coach-in 0.3s ease; font-size: 0.85rem; max-width: 320px; }
.mt-icon { font-size: 1.4rem; }
.mt-xp { color: var(--accent); font-weight: 800; }
.mt-rank { color: var(--accent-orange); font-weight: 700; }
.mt-hide { opacity: 0; transform: translateX(30px); transition: all 0.5s ease; }

@media (max-width: 992px) {
    .term-layout { grid-template-columns: 1fr; }
    .xterm-wrap { height: 380px; }
}
@media (max-width: 600px) {
    .coach-panel { right: 10px; left: 10px; width: auto; }
}

.term-try { margin-top: 24px; padding: 16px; background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); display: flex; align-items: center; flex-wrap: wrap; gap: 8px; }
.term-try-label { width: 100%; font-weight: 700; color: var(--accent); font-size: 0.9rem; margin-bottom: 2px; }
.term-try .qs-chip:hover { color: var(--accent); border-color: var(--accent); }

.term-save-row { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin: 14px 0 4px; padding: 12px 14px; background: var(--bg-card); border: 1px dashed var(--border-light); border-radius: var(--radius-sm); }
.term-save-note { color: var(--text-secondary); font-size: 0.82rem; flex: 1 1 100%; margin-bottom: 4px; }
.btn-sm { padding: 6px 14px; font-size: 0.8rem; }


/* ===== BOUTON RETOUR MENU PRINCIPAL (Horizon 5) ===== */
.nav-back {
    display: inline-flex; align-items: center; justify-content: center;
    width: 38px; height: 38px; margin-right: 10px; flex-shrink: 0;
    border-radius: 10px; background: rgba(255,255,255,0.06);
    border: 1px solid rgba(255,255,255,0.14); color: #fff;
    text-decoration: none; font-size: 1.3rem; font-weight: 700; line-height: 1;
    transition: background 0.25s, border-color 0.25s, transform 0.25s;
}
.nav-back:hover {
    background: rgba(255,255,255,0.14); border-color: rgba(255,255,255,0.3); transform: translateX(-2px);
}

/* ===== HARMONISATION VISUELLE HORIZON 5 (audit septembre 2026) ===== */
/* Bloc additif : uniformise sans changer l'accent de la formation. */
/* Boutons : paddings et radius unifies */
.btn { padding: 14px 32px; border-radius: 10px; gap: 8px; text-decoration: none; }
/* Cartes : radius 12px */
.course-card, .module, .modal, .memo-card, .install-card, .quiz-q, .flash-card, .schema-card, .first-steps-box, .coach-zone { border-radius: 12px; }
/* Transitions unifiees a 0.25s */
.btn, .course-card, .nav-link, .dropdown-content a, .nav-back, .quiz-opt, .q-opt, .qs-chip { transition: all 0.25s ease; }
/* Focus clavier visible */
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }
.nav-back:focus-visible { outline: 2px solid #fff; outline-offset: 3px; }
/* Details et summary : curseur pointeur et espacement */
details summary { cursor: pointer; margin: 4px 0; }
/* Composants communs */
.disclaimer { margin-top: 8px; font-size: 0.85em; color: var(--text-secondary); line-height: 1.6; }
.course-section { margin-top: 24px; }
.course-section h4 { margin-bottom: 10px; font-size: 1.1rem; }
.course-section p { margin-bottom: 12px; font-size: 0.95rem; color: var(--text-secondary); }
.course-section ul { margin: 0 0 12px 20px; }
.course-section ul li { margin-bottom: 6px; font-size: 0.93rem; }
.course-code { font-family: 'JetBrains Mono', monospace; font-size: 0.85em; padding: 2px 6px; border-radius: 4px; }
.course-note { border-radius: 8px; padding: 14px 16px; margin: 14px 0; font-size: 0.9rem; }
/* Contraste : l'accent brut (#3776ab, 3.99:1) est insuffisant en texte courant, */
/* les liens du contenu utilisent une declinaison eclaircie, les boutons gardent l'accent. */
.section a:not(.btn):not(.nav-link), .course-card a:not(.btn), .module-body a { color: #7fb6e0; }
/* Tableaux : defilement horizontal sur petit ecran */
.table-responsive { overflow-x: auto; }
/* Responsive minimal : hamburger, grilles en 1 colonne, tableaux scrollables */
@media (max-width: 768px) {
    .course-grid, .install-grid, .memo-grid, .level-grid, .courses-grid, .footer-grid { grid-template-columns: 1fr; }
    table.memo, .cmd-table, .exam-table { display: block; width: 100%; overflow-x: auto; }
    .hero { padding: 100px 16px 60px; }
    .section { padding: 60px 16px; }
    .nav-menu.open, .nav-menu.active { display: flex; }
}

/* ===== TERMINAL PYTHON (simulateur DOM, sans dependance) ===== */
.term-screen {
    background: #05080f;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    height: 440px;
    overflow-y: auto;
    padding: 16px 18px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.88rem;
    line-height: 1.7;
    color: #d7e3f4;
}
.term-line { white-space: pre-wrap; word-break: break-word; }
.term-echo { color: var(--accent-cyan); }
.term-ok { color: #4ade80; }
.term-err { color: #f87171; }
.term-hint { color: #93c5fd; }
.term-line strong { color: #ffffff; }
.term-input-row {
    display: flex;
    align-items: center;
    gap: 10px;
    background: var(--bg-secondary);
    padding: 12px 16px;
}
.term-prompt {
    font-family: 'JetBrains Mono', monospace;
    font-weight: 700;
    color: var(--accent);
    white-space: nowrap;
}
.term-input {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-primary);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.92rem;
}