@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;600;700&family=Inter:wght@300;400;500;600;700;800;900&display=swap');

:root {
    --primary: #ff6600;
    --primary-dark: #cc5200;
    --primary-glow: rgba(255, 102, 0, 0.4);
    --bg-dark: #0a0a0f;
    --bg-card: #12121a;
    --bg-card-hover: #1a1a28;
    --bg-nav: rgba(10, 10, 15, 0.95);
    --text-primary: #e8e8f0;
    --text-secondary: #8888a0;
    --text-muted: #555570;
    --border: #2a2a3a;
    --success: #00cc66;
    --danger: #ff3344;
    --info: #3399ff;
    --warning: #ffaa00;
    --terminal-bg: #0d0d14;
    --terminal-green: #00ff88;
    --radius: 12px;
    --radius-sm: 10px;
    --shadow: 0 4px 24px rgba(0,0,0,0.4);
    --shadow-lg: 0 8px 48px rgba(0,0,0,0.6);
    --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html { scroll-behavior: smooth; }

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

::selection { background: var(--primary); color: #fff; }

::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg-dark); }
::-webkit-scrollbar-thumb { background: var(--primary-dark); border-radius: 4px; }

a { color: var(--primary); text-decoration: none; transition: var(--transition); }
a:hover { color: #ff8833; }

/* ===== NAVBAR ===== */
.navbar {
    position: fixed; top: 0; left: 0; width: 100%; z-index: 1000;
    background: var(--bg-nav);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    transition: var(--transition);
}
.navbar.scrolled { box-shadow: var(--shadow-lg); }

.nav-container {
    max-width: 1300px; margin: 0 auto;
    display: flex; align-items: center; justify-content: space-between;
    padding: 0 24px; height: 70px;
}

.nav-logo {
    display: flex; align-items: center; gap: 10px;
    font-size: 1.4rem; font-weight: 800; color: var(--text-primary);
}
.logo-icon {
    background: var(--primary);
    color: #fff;
    padding: 4px 10px;
    border-radius: var(--radius-sm);
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.1rem;
}

.nav-menu { display: flex; align-items: center; gap: 6px; }

.nav-link {
    padding: 8px 16px; border-radius: var(--radius-sm);
    color: var(--text-secondary); font-weight: 500; font-size: 0.95rem;
    transition: var(--transition);
}
.nav-link:hover, .nav-link.active { color: var(--primary); background: rgba(255,102,0,0.08); }

.nav-dropdown { position: relative; }
.dropdown-content {
    display: none; position: absolute; top: 100%; left: 0;
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius); min-width: 200px;
    box-shadow: var(--shadow-lg); padding: 8px; z-index: 100;
}
.nav-dropdown:hover .dropdown-content { display: block; }
.dropdown-content a {
    display: block; padding: 10px 16px; border-radius: var(--radius-sm);
    color: var(--text-secondary); font-size: 0.9rem;
}
.dropdown-content a:hover { background: rgba(255,102,0,0.1); color: var(--primary); }

.hamburger {
    display: none; flex-direction: column; gap: 5px;
    background: none; border: none; cursor: pointer; padding: 8px;
}
.hamburger span {
    width: 26px; height: 2.5px; background: var(--text-primary);
    border-radius: 2px; transition: var(--transition);
}

/* ===== HERO ===== */
.hero {
    position: relative; min-height: 100vh;
    display: flex; align-items: center; justify-content: center;
    overflow: hidden; padding: 100px 24px 60px;
}
.hero-bg {
    position: absolute; inset: 0;
    background: radial-gradient(ellipse at 30% 50%, rgba(255,102,0,0.08) 0%, transparent 60%),
                radial-gradient(ellipse at 70% 50%, rgba(255,50,0,0.05) 0%, transparent 60%);
}
.hero-bg::before {
    content: ''; position: absolute; inset: 0;
    background-image: 
        linear-gradient(rgba(255,102,0,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,102,0,0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    animation: gridMove 20s linear infinite;
}
@keyframes gridMove {
    0% { transform: translate(0,0); }
    100% { transform: translate(60px,60px); }
}

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

.hero-badge {
    display: inline-block; padding: 8px 20px; border-radius: 30px;
    background: rgba(255,102,0,0.1); border: 1px solid rgba(255,102,0,0.3);
    color: var(--primary); font-size: 0.85rem; font-weight: 600;
    margin-bottom: 24px; letter-spacing: 0.5px;
}

.hero-title {
    font-size: clamp(2.8rem, 6vw, 5rem);
    font-weight: 900; line-height: 1.1; margin-bottom: 20px;
}
.highlight {
    background: linear-gradient(135deg, var(--primary), #ff3300);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.2rem; color: var(--text-secondary);
    max-width: 650px; margin: 0 auto 40px;
}

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

.btn {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 14px 32px; border-radius: var(--radius-sm);
    font-weight: 600; font-size: 1rem; border: none; cursor: pointer;
    transition: var(--transition); text-decoration: none;
}
.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: #fff; box-shadow: 0 4px 20px var(--primary-glow);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 30px var(--primary-glow); color: #fff; }
.btn-outline {
    background: transparent; color: var(--text-primary);
    border: 2px solid var(--border);
}
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }

/* ===== SECTIONS ===== */
.section { padding: 100px 24px; max-width: 1300px; margin: 0 auto; }
.section-header { text-align: center; margin-bottom: 60px; }
.section-tag {
    display: inline-block; padding: 6px 16px; border-radius: 20px;
    background: rgba(255,102,0,0.1); color: var(--primary);
    font-size: 0.8rem; font-weight: 700; letter-spacing: 1px;
    text-transform: uppercase; margin-bottom: 16px;
}
.section-title {
    font-size: clamp(2rem, 4vw, 3rem); font-weight: 800;
    margin-bottom: 16px;
}
.section-desc {
    font-size: 1.1rem; color: var(--text-secondary); max-width: 600px; margin: 0 auto;
}

/* ===== CARDS ===== */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 24px;
}

.card {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 36px 28px;
    transition: var(--transition); position: relative; overflow: hidden;
}
.card::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
    background: linear-gradient(90deg, var(--primary), transparent);
    opacity: 0; transition: var(--transition);
}
.card:hover { border-color: rgba(255,102,0,0.3); transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.card:hover::before { opacity: 1; }

.card-icon {
    width: 60px; height: 60px; border-radius: var(--radius-sm);
    background: rgba(255,102,0,0.1); display: flex;
    align-items: center; justify-content: center;
    font-size: 1.6rem; margin-bottom: 20px;
}

.card-title { font-size: 1.25rem; font-weight: 700; margin-bottom: 10px; }
.card-text { color: var(--text-secondary); font-size: 0.95rem; margin-bottom: 20px; line-height: 1.6; }

.card-meta {
    display: flex; gap: 16px; flex-wrap: wrap;
    padding-top: 16px; border-top: 1px solid var(--border);
}
.card-meta span {
    display: flex; align-items: center; gap: 6px;
    font-size: 0.82rem; color: var(--text-muted);
}
.card-meta .dot {
    width: 6px; height: 6px; border-radius: 50%;
    display: inline-block;
}
.dot-green { background: var(--success); }
.dot-yellow { background: var(--warning); }
.dot-red { background: var(--danger); }

.card-link {
    display: inline-flex; align-items: center; gap: 6px;
    color: var(--primary); font-weight: 600; font-size: 0.95rem;
    margin-top: 16px;
}
.card-link:hover { gap: 10px; }

/* ===== STATS ===== */
.stats-bar {
    display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px;
    padding: 60px 0;
}
.stat-item { text-align: center; }
.stat-number {
    font-size: 2.8rem; font-weight: 900; color: var(--primary);
    font-family: 'JetBrains Mono', monospace;
}
.stat-label { font-size: 0.9rem; color: var(--text-secondary); margin-top: 4px; }

/* ===== LEVEL PAGES ===== */
.page-header {
    padding: 120px 24px 60px; text-align: center;
    background: radial-gradient(ellipse at 50% 0%, rgba(255,102,0,0.1) 0%, transparent 60%);
}
.page-header .level-badge {
    display: inline-block; padding: 8px 24px; border-radius: 30px;
    font-size: 0.85rem; font-weight: 700; margin-bottom: 16px;
}
.level-debutant { background: rgba(0,204,102,0.15); color: var(--success); border: 1px solid rgba(0,204,102,0.3); }
.level-inter { background: rgba(255,170,0,0.15); color: var(--warning); border: 1px solid rgba(255,170,0,0.3); }
.level-expert { background: rgba(255,51,68,0.15); color: var(--danger); border: 1px solid rgba(255,51,68,0.3); }

.page-header h1 {
    font-size: clamp(2rem, 5vw, 3.5rem); font-weight: 900; margin-bottom: 16px;
}
.page-header p { font-size: 1.1rem; color: var(--text-secondary); max-width: 600px; margin: 0 auto; }

.module-list { list-style: none; padding: 0; }
.module-item {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius); margin-bottom: 20px;
    overflow: hidden; transition: var(--transition);
}
.module-item:hover { border-color: rgba(255,102,0,0.3); }

.module-header {
    padding: 24px 28px; cursor: pointer;
    display: flex; align-items: center; gap: 16px;
}
.module-num {
    width: 44px; height: 44px; border-radius: var(--radius-sm);
    background: rgba(255,102,0,0.15); color: var(--primary);
    display: flex; align-items: center; justify-content: center;
    font-weight: 800; font-family: 'JetBrains Mono', monospace;
    font-size: 0.95rem; flex-shrink: 0;
}
.module-info { flex: 1; }
.module-info h3 { font-size: 1.15rem; font-weight: 700; margin-bottom: 4px; }
.module-info p { font-size: 0.88rem; color: var(--text-secondary); }
.module-arrow {
    font-size: 1.2rem; color: var(--text-muted);
    transition: var(--transition);
}
.module-item.active .module-arrow { transform: rotate(180deg); color: var(--primary); }

.module-content {
    display: none; padding: 0 28px 28px;
    border-top: 1px solid var(--border);
}
.module-item.active .module-content { display: block; padding-top: 24px; }

.topic-list { list-style: none; padding: 0; }
.topic-item {
    display: flex; align-items: center; gap: 12px;
    padding: 12px 16px; border-radius: var(--radius-sm);
    margin-bottom: 4px; transition: var(--transition);
}
.topic-item:hover { background: rgba(255,102,0,0.05); }
.topic-check { color: var(--success); font-size: 1.1rem; }
.topic-text { flex: 1; font-size: 0.93rem; }
.topic-difficulty {
    padding: 3px 10px; border-radius: 12px; font-size: 0.75rem; font-weight: 600;
}
.diff-facile { background: rgba(0,204,102,0.15); color: var(--success); }
.diff-moyen { background: rgba(255,170,0,0.15); color: var(--warning); }
.diff-difficile { background: rgba(255,51,68,0.15); color: var(--danger); }

/* ===== COURSE DETAILS (CEH) ===== */
.course-section { margin-top: 24px; }
.course-section h4 { color: var(--primary); 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; list-style: none; }
.course-section ul li { position: relative; padding-left: 20px; margin-bottom: 6px; font-size: 0.93rem; }
.course-section ul li::before { content: '▸'; position: absolute; left: 0; color: var(--primary); }
.course-section ul li strong { color: var(--text-primary); }
.course-code {
    display: block; background: #0d0d14; border: 1px solid var(--border);
    border-left: 3px solid var(--primary); border-radius: 8px;
    padding: 14px 16px; margin: 10px 0 16px;
    font-family: 'JetBrains Mono', monospace; font-size: 0.85rem;
    color: var(--terminal-green); overflow-x: auto; white-space: pre; line-height: 1.5;
}
.course-note {
    background: rgba(255,102,0,0.08); border-left: 3px solid var(--primary);
    border-radius: 8px; padding: 14px 16px; margin: 14px 0;
    font-size: 0.9rem; color: var(--text-secondary);
}
.course-note strong { color: var(--primary); }

/* ===== QUIZ ===== */
.quiz-container { max-width: 800px; margin: 0 auto; }

.quiz-tabs {
    display: flex; gap: 8px; margin-bottom: 32px; flex-wrap: wrap; justify-content: center;
}
.quiz-tab {
    padding: 10px 24px; border-radius: var(--radius-sm);
    background: var(--bg-card); border: 1px solid var(--border);
    color: var(--text-secondary); font-weight: 600; cursor: pointer;
    transition: var(--transition); font-size: 0.9rem;
}
.quiz-tab.active {
    background: rgba(255,102,0,0.15); border-color: var(--primary);
    color: var(--primary);
}
.quiz-tab:hover { border-color: var(--primary); }

.quiz-question {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 28px; margin-bottom: 20px;
}
.quiz-q-num {
    display: inline-block; padding: 4px 12px; border-radius: 6px;
    background: rgba(255,102,0,0.15); color: var(--primary);
    font-size: 0.8rem; font-weight: 700; margin-bottom: 12px;
    font-family: 'JetBrains Mono', monospace;
}
.quiz-q-text { font-size: 1.05rem; font-weight: 600; margin-bottom: 16px; }

.quiz-options { display: flex; flex-direction: column; gap: 10px; }
.quiz-option {
    display: flex; align-items: center; gap: 12px;
    padding: 14px 18px; border-radius: var(--radius-sm);
    background: rgba(255,255,255,0.02); border: 1px solid var(--border);
    cursor: pointer; transition: var(--transition); font-size: 0.95rem;
}
.quiz-option:hover { border-color: rgba(255,102,0,0.3); background: rgba(255,102,0,0.03); }
.quiz-option.selected { border-color: var(--primary); background: rgba(255,102,0,0.08); }
.quiz-option.correct { border-color: var(--success); background: rgba(0,204,102,0.1); }
.quiz-option.wrong { border-color: var(--danger); background: rgba(255,51,68,0.1); }

.quiz-option-letter {
    width: 32px; height: 32px; border-radius: 50%;
    background: var(--bg-dark); display: flex;
    align-items: center; justify-content: center;
    font-weight: 700; font-size: 0.85rem; flex-shrink: 0;
}
.quiz-option.correct .quiz-option-letter { background: var(--success); color: #fff; }
.quiz-option.wrong .quiz-option-letter { background: var(--danger); color: #fff; }

.quiz-result {
    display: none; text-align: center; padding: 40px;
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius); margin-top: 24px;
}
.quiz-score {
    font-size: 3rem; font-weight: 900; color: var(--primary);
    font-family: 'JetBrains Mono', monospace;
}
.quiz-explanation {
    display: none; padding: 14px 18px; margin-top: 12px;
    background: rgba(51,153,255,0.08); border: 1px solid rgba(51,153,255,0.2);
    border-radius: var(--radius-sm); font-size: 0.9rem; color: var(--info);
}

/* ===== TERMINAL ===== */
.terminal-page { padding: 90px 24px 40px; max-width: 1300px; margin: 0 auto; }

.terminal-wrapper {
    background: var(--terminal-bg); border: 1px solid var(--border);
    border-radius: var(--radius); overflow: hidden;
    box-shadow: var(--shadow-lg); max-height: 80vh;
    display: flex; flex-direction: column;
}
.terminal-header {
    display: flex; align-items: center; justify-content: space-between;
    padding: 12px 20px; background: rgba(255,255,255,0.03);
    border-bottom: 1px solid var(--border);
}
.terminal-dots { display: flex; gap: 8px; }
.terminal-dot {
    width: 12px; height: 12px; border-radius: 50%;
}
.terminal-dot:nth-child(1) { background: #ff5f56; }
.terminal-dot:nth-child(2) { background: #ffbd2e; }
.terminal-dot:nth-child(3) { background: #27c93f; }
.terminal-title {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.82rem; color: var(--text-muted);
}
.terminal-body {
    flex: 1; overflow-y: auto; padding: 20px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.88rem; line-height: 1.6;
    min-height: 500px;
}
.terminal-body::-webkit-scrollbar { width: 6px; }
.terminal-body::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }

.term-line { margin-bottom: 2px; white-space: pre-wrap; word-break: break-all; }
.term-prompt { color: var(--primary); }
.term-path { color: var(--success); }
.term-cmd { color: var(--text-primary); }
.term-output { color: var(--text-secondary); }
.term-success { color: var(--success); }
.term-error { color: var(--danger); }
.term-info { color: var(--info); }
.term-warning { color: var(--warning); }
.term-header { color: var(--primary); font-weight: 700; }

.terminal-input-line {
    display: flex; align-items: center; gap: 0;
}
.terminal-input {
    flex: 1; background: none; border: none; outline: none;
    color: var(--text-primary); font-family: 'JetBrains Mono', monospace;
    font-size: 0.88rem; caret-color: var(--primary);
}

.terminal-commands {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 12px; margin-top: 24px;
}
.term-cmd-btn {
    padding: 12px 16px; border-radius: var(--radius-sm);
    background: var(--bg-card); border: 1px solid var(--border);
    color: var(--text-secondary); cursor: pointer;
    transition: var(--transition); text-align: left;
    font-family: 'JetBrains Mono', monospace; font-size: 0.82rem;
}
.term-cmd-btn:hover { border-color: var(--primary); color: var(--primary); }
.term-cmd-btn strong { display: block; color: var(--text-primary); margin-bottom: 4px; }

/* ===== FOOTER ===== */
.footer {
    border-top: 1px solid var(--border); padding: 60px 24px 30px;
    background: rgba(0,0,0,0.3);
}
.footer-content {
    max-width: 1300px; margin: 0 auto;
    display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px;
}
.footer-brand p { color: var(--text-secondary); margin-top: 12px; font-size: 0.9rem; }
.footer h4 {
    font-size: 0.85rem; text-transform: uppercase; letter-spacing: 1px;
    color: var(--text-muted); margin-bottom: 16px;
}
.footer-links { list-style: none; }
.footer-links li { margin-bottom: 8px; }
.footer-links a { color: var(--text-secondary); font-size: 0.9rem; }
.footer-links a:hover { color: var(--primary); }
.footer-bottom {
    max-width: 1300px; margin: 40px auto 0; padding-top: 24px;
    border-top: 1px solid var(--border); text-align: center;
    color: var(--text-muted); font-size: 0.82rem;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    .nav-menu {
        display: none; position: fixed; top: 70px; left: 0; right: 0;
        background: var(--bg-nav); flex-direction: column;
        padding: 20px; border-bottom: 1px solid var(--border);
    }
    .nav-menu.open { display: flex; }
    .hamburger { display: flex; }
    .nav-search { display: none; }
    .stats-bar { grid-template-columns: repeat(2, 1fr); }
    .footer-content { grid-template-columns: 1fr; }
    .cards-grid { grid-template-columns: 1fr; }
}

/* ===== GLOW EFFECTS ===== */
.glow-orange { box-shadow: 0 0 30px rgba(255,102,0,0.15); }

/* ===== TOOL CARDS (Terminal Page) ===== */
.tools-grid {
    display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 12px; margin-top: 20px;
}
.tool-chip {
    padding: 10px 14px; border-radius: var(--radius-sm);
    background: var(--bg-card); border: 1px solid var(--border);
    cursor: pointer; transition: var(--transition);
    font-family: 'JetBrains Mono', monospace; font-size: 0.82rem;
    color: var(--text-secondary); text-align: center;
}
.tool-chip:hover { border-color: var(--primary); color: var(--primary); background: rgba(255,102,0,0.05); }

/* ===== ANIMATIONS ===== */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}
.animate-in { animation: fadeInUp 0.6s ease forwards; }

@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0; }
}
.cursor-blink::after {
    content: '█'; animation: blink 1s step-end infinite; color: var(--primary);
}


/* ===== 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. */
/* Correspondance des noms de variables (cette formation utilise --primary). */
:root { --accent: var(--primary); --accent-dim: var(--primary-dark); --accent-glow: var(--primary-glow); }
/* 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(--primary); 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 (le texte attenue brut #555570 a 2.59:1, on utilise --text-secondary 5.39:1) */
.disclaimer { margin-top: 8px; font-size: 0.85em; color: var(--text-secondary); line-height: 1.6; }
/* 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; }
}