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

:root {
    --bg: #0a0a0f;
    --bg-card: #12121a;
    --bg-hover: #1c1c2a;
    --text: #e8e8f0;
    --text-dim: #8888a0;
    --accent: #8b5cf6;
    --accent-hover: #7c3aed;
    --accent2: #06b6d4;
    --accent3: #f59e0b;
    --green: #34d399;
    --red: #f87171;
    --border: #1e1e30;
    --radius: 12px;
    --glow: rgba(139, 92, 246, .15);
}

body {
    font-family: 'Inter', -apple-system, sans-serif;
    background: var(--bg);
    background-image: radial-gradient(ellipse at 20% 0%, rgba(139, 92, 246, .04) 0%, transparent 60%),
                      radial-gradient(ellipse at 80% 100%, rgba(6, 182, 212, .04) 0%, transparent 60%);
    color: var(--text);
    line-height: 1.7;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

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

header {
    border-bottom: 1px solid var(--border);
    background: rgba(10,10,15,.85);
    backdrop-filter: blur(12px);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 14px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-weight: 700;
    font-size: 1.2rem;
    letter-spacing: -.02em;
    background: linear-gradient(135deg, var(--accent), var(--accent2));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

nav { display: flex; align-items: center; gap: 20px; font-size: .9rem; }
.user-name { color: var(--text-dim); font-size: .85rem; }

main {
    flex: 1;
    max-width: 900px;
    margin: 0 auto;
    padding: 40px 24px;
    width: 100%;
}

footer {
    text-align: center;
    padding: 24px;
    color: var(--text-dim);
    font-size: .85rem;
    border-top: 1px solid var(--border);
}

.btn {
    display: inline-block;
    padding: 10px 22px;
    border-radius: 8px;
    font-weight: 500;
    font-size: .9rem;
    border: none;
    cursor: pointer;
    transition: all .2s;
    text-decoration: none !important;
}
.btn-primary {
    background: linear-gradient(135deg, var(--accent), var(--accent-hover));
    color: #fff !important;
    box-shadow: 0 4px 16px var(--glow);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 28px var(--glow); }
.btn-secondary {
    background: var(--bg-card);
    color: var(--text) !important;
    border: 1px solid var(--border);
}
.btn-secondary:hover { background: var(--bg-hover); }

.alert {
    padding: 12px 20px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-size: .9rem;
}
.alert-success { background: rgba(52,211,153,.1); color: var(--green); border: 1px solid rgba(52,211,153,.2); }
.alert-error { background: rgba(248,113,113,.1); color: var(--red); border: 1px solid rgba(248,113,113,.2); }

.hero { text-align: center; padding: 80px 0 60px; }
.hero h1 { font-size: 2.8rem; font-weight: 700; letter-spacing: -.03em; margin-bottom: 12px; background: linear-gradient(135deg, var(--accent), var(--accent2), var(--accent3)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero-sub { font-size: 1.2rem; color: var(--text-dim); margin-bottom: 8px; }
.hero-desc { font-size: 1rem; color: var(--text-dim); max-width: 550px; margin: 0 auto 32px; }
.hero-actions { display: flex; gap: 12px; justify-content: center; }

.features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-top: 60px;
}
.feature {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px;
    transition: all .25s;
}
.feature:hover { border-color: var(--accent); transform: translateY(-2px); box-shadow: 0 8px 32px var(--glow); }
.feature h3 { font-size: 1.1rem; margin-bottom: 8px; }
.feature p { font-size: .9rem; color: var(--text-dim); line-height: 1.6; }

.auth { max-width: 400px; margin: 60px auto; }
.auth h1 { text-align: center; margin-bottom: 28px; }
.auth-form { display: flex; flex-direction: column; gap: 14px; }
.auth-form label { font-size: .9rem; font-weight: 500; }
.auth-form input {
    padding: 12px 16px;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: var(--bg-card);
    color: var(--text);
    font-size: .95rem;
    font-family: inherit;
    transition: all .2s;
}
.auth-form input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--glow); }
.auth-link { text-align: center; margin-top: 20px; font-size: .9rem; color: var(--text-dim); }
.auth-forgot { display: block; text-align: right; font-size: .85rem; color: var(--accent2); margin-top: -8px; }
.auth-forgot:hover { color: var(--accent); }
.dashboard-lesson-counter { font-size: .9rem; color: var(--text-dim); margin-top: 4px; }
.dashboard-lesson-counter strong { color: var(--accent); }

.dashboard h1 { font-size: 1.8rem; margin-bottom: 8px; }
.dashboard-info { color: var(--text-dim); margin-bottom: 28px; }
.dash-top { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 28px; gap: 16px; flex-wrap: wrap; }
.dash-header { flex: 1; }
.dash-header .dashboard-info { margin-bottom: 0; }
.streak-box {
    display: flex; align-items: center; gap: 8px;
    padding: 10px 18px; border-radius: var(--radius);
    background: linear-gradient(135deg, rgba(245,158,11,.08), rgba(245,158,11,.02));
    border: 1px solid rgba(245,158,11,.2);
    white-space: nowrap;
}
.streak-fire { font-size: 1.4rem; }
.streak-num { font-size: 1.6rem; font-weight: 800; color: var(--accent3); }
.streak-label { font-size: .78rem; color: var(--text-dim); }

.lesson-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 14px;
}
.lesson-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px 22px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    transition: all .25s;
    color: var(--text) !important;
    position: relative;
    overflow: hidden;
}
.lesson-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--accent), transparent);
    opacity: 0;
    transition: opacity .25s;
}
.lesson-card:hover { background: var(--bg-hover); border-color: var(--accent); transform: translateY(-3px); box-shadow: 0 8px 32px var(--glow); }
.lesson-card:hover::before { opacity: .6; }
.lesson-card.completed { border-color: rgba(52,211,153,.3); background: rgba(52,211,153,.02); }
.lesson-card.completed::before { background: linear-gradient(90deg, transparent, var(--green), transparent); opacity: .4; }
.lesson-card.completed .lesson-num { color: var(--green); }
.lesson-card.locked { opacity: .45; cursor: not-allowed; pointer-events: none; }
.lesson-card.locked:hover { transform: none; border-color: var(--border); box-shadow: none; }
.lesson-card.locked::before { display: none; }
.status-badge.locked-badge { background: rgba(136,136,136,.08); color: var(--text-dim); }
.card-bottom { display: flex; align-items: center; justify-content: space-between; margin-top: 4px; }
.card-test-btn {
    font-size: .72rem;
    font-weight: 600;
    padding: 3px 10px;
    border-radius: 20px;
    background: var(--accent);
    color: #fff;
    cursor: pointer;
    transition: all .15s;
    text-transform: uppercase;
    letter-spacing: .03em;
}
.card-test-btn:hover { background: var(--accent-hover); transform: scale(1.05); }
.lesson-num { font-size: .8rem; font-weight: 600; color: var(--text-dim); font-family: 'JetBrains Mono', monospace; }
.lesson-title { font-weight: 500; font-size: .95rem; line-height: 1.4; flex: 1; }

.chapter-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 16px;
    margin-bottom: 32px;
}
.chapter-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 22px 24px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    transition: all .25s;
    color: var(--text) !important;
    position: relative;
    overflow: hidden;
}
.chapter-card::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
    background: linear-gradient(90deg, transparent, var(--accent), transparent);
    opacity: 0; transition: opacity .25s;
}
.chapter-card:hover { background: var(--bg-hover); border-color: var(--accent); transform: translateY(-3px); box-shadow: 0 8px 32px var(--glow); }
.chapter-card:hover::before { opacity: .6; }
.chapter-card.completed { border-color: rgba(52,211,153,.3); }
.chapter-card.completed::before { background: linear-gradient(90deg, transparent, var(--green), transparent); opacity: .4; }
.chapter-card.locked { opacity: .45; cursor: not-allowed; pointer-events: none; }
.chapter-card.locked:hover { transform: none; border-color: var(--border); box-shadow: none; }
.chapter-card.locked::before { display: none; }
.ch-top { display: flex; justify-content: space-between; align-items: center; }
.ch-num { font-size: .75rem; font-weight: 700; color: var(--accent2); text-transform: uppercase; letter-spacing: .05em; font-family: 'JetBrains Mono', monospace; }
.ch-progress { font-size: .85rem; font-weight: 700; color: var(--text-dim); font-family: 'JetBrains Mono', monospace; }
.ch-progress.locked { font-size: 1rem; }
.chapter-card .ch-title { font-size: 1.1rem; font-weight: 600; margin: 0; }
.chapter-card .ch-desc { font-size: .85rem; color: var(--text-dim); line-height: 1.5; margin: 0; }
.ch-bar-bg { height: 4px; background: var(--bg-hover); border-radius: 2px; overflow: hidden; margin-top: 4px; }
.ch-bar-fill { height: 100%; background: linear-gradient(90deg, var(--accent2), var(--accent)); border-radius: 2px; transition: width .5s; }
.chapter-card.completed .ch-bar-fill { background: linear-gradient(90deg, var(--green), var(--accent)); }

.chapter-card.cooldown { opacity: .65; cursor: default; pointer-events: auto; }
.chapter-card.cooldown:hover { transform: none; border-color: var(--border); box-shadow: none; }
.chapter-card.cooldown::before { display: none; }
.chapter-card.cooldown .cooldown-msg {
    font-size: .8rem;
    color: var(--text-dim);
    line-height: 1.5;
    text-align: center;
    padding: 10px 12px;
    margin-top: 4px;
    border-radius: 8px;
    background: rgba(136,136,160,.06);
}
.chapter-card.cooldown .cooldown-refresh {
    color: var(--accent2);
    font-weight: 600;
    text-decoration: underline;
    text-underline-offset: 2px;
}
.chapter-card.cooldown .cooldown-refresh:hover { color: var(--accent); }
.chapter-card.cooldown .cooldown-timer {
    text-align: center;
    font-size: .85rem;
    font-weight: 700;
    color: var(--accent3);
    font-family: 'JetBrains Mono', monospace;
    padding: 4px 0;
}
.chapter-card.cooldown .cooldown-bypass {
    display: block;
    text-align: center;
    padding: 8px 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: .8rem;
    color: var(--text-dim);
    transition: all .2s;
}
.chapter-card.cooldown .cooldown-bypass:hover {
    border-color: var(--accent2);
    color: var(--accent2);
    background: rgba(6,182,212,.06);
}

.chapter-page .back-link { display: inline-block; margin-bottom: 16px; font-size: .85rem; color: var(--text-dim); }
.chapter-page .back-link:hover { color: var(--accent); }
.ch-header { margin-bottom: 24px; }
.ch-badge { display: inline-block; padding: 3px 10px; border-radius: 20px; font-size: .7rem; font-weight: 700; text-transform: uppercase; letter-spacing: .05em; background: rgba(6,182,212,.1); color: var(--accent2); font-family: 'JetBrains Mono', monospace; margin-bottom: 8px; }
.ch-header h1 { font-size: 1.5rem; margin-bottom: 6px; }
.ch-header .ch-desc { color: var(--text-dim); font-size: .9rem; }

.dl-path { position: relative; padding: 16px 0 8px; max-width: 800px; margin: 0 auto; }
.dl-path::before {
    content: ''; position: absolute; left: 50%; top: 0; bottom: 0;
    width: 4px; background: linear-gradient(to bottom, rgba(6,182,212,.2), rgba(139,92,246,.2));
    border-radius: 2px; transform: translateX(-2px);
}
.dl-node {
    position: relative; display: flex; align-items: flex-start;
    margin-bottom: 4px; min-height: 86px;
    justify-content: flex-start;
}
.dl-node.right { justify-content: flex-end; }

.dl-marker {
    position: absolute; left: 50%; top: 20px;
    width: 50px; height: 50px; border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    background: #1e1e2e; border: 3px solid #3a3a52;
    z-index: 2; font-size: .9rem; font-weight: 700;
    font-family: 'JetBrains Mono', monospace;
    transition: all .25s;
    transform: translateX(-25px);
}
.dl-icon { color: #cdd6f4; }
.dl-test-icon {
    width: 28px; height: 28px; border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    background: rgba(6,182,212,.12); color: #22d3ee;
    font-size: .72rem; font-weight: 800;
}
.dl-card {
    width: calc(50% - 44px); max-width: 380px;
    background: #1e1e2e; border: 1px solid #313244;
    border-radius: 14px; padding: 14px 20px;
    transition: all .2s; position: relative; margin: 0 22px;
}
.dl-node.left .dl-card { margin-right: auto; }
.dl-node.right .dl-card { margin-left: auto; }
.dl-card::before {
    content: ''; position: absolute; top: 24px; width: 12px; height: 12px;
    background: #1e1e2e;
}
.dl-node.left .dl-card::before {
    left: -7px; border-left: 1px solid #313244; border-bottom: 1px solid #313244;
    transform: rotate(45deg);
}
.dl-node.right .dl-card::before {
    right: -7px; border-right: 1px solid #313244; border-top: 1px solid #313244;
    transform: rotate(45deg);
}
.dl-label { font-size: .68rem; font-weight: 700; text-transform: uppercase; letter-spacing: .06em; color: var(--text-dim); font-family: 'JetBrains Mono', monospace; margin-bottom: 2px; }
.dl-title { font-size: .9rem; font-weight: 600; line-height: 1.4; margin-bottom: 6px; }
.dl-actions { display: flex; align-items: center; gap: 10px; }
.dl-btn {
    display: inline-block; padding: 6px 18px; border-radius: 20px;
    font-size: .78rem; font-weight: 600; text-decoration: none !important;
    background: var(--accent); color: #fff; transition: all .15s;
}
.dl-btn:hover { background: var(--accent-hover); transform: scale(1.04); }
.dl-btn-test { background: var(--accent2); }
.dl-btn-test:hover { background: #0891b2; }
.dl-btn-sm {
    font-size: .72rem; font-weight: 500; color: var(--text-dim);
    text-decoration: none !important; padding: 2px 8px;
    border-radius: 12px; border: 1px solid var(--border);
    transition: all .15s;
}
.dl-btn-sm:hover { border-color: var(--accent); color: var(--accent); }
.dl-done { font-size: .78rem; font-weight: 600; color: var(--green); }
.dl-locked { font-size: 1rem; }

/* completed state */
.dl-node.completed .dl-marker {
    background: #52d199; border-color: #52d199;
}
.dl-node.completed .dl-icon { color: #0a0a1a; }
.dl-node.completed .dl-test-icon { background: rgba(0,0,0,.2); color: #0a0a1a; }
.dl-node.completed .dl-card { border-color: rgba(82,209,153,.3); }
.dl-node.completed .dl-card::before {
    border-color: rgba(82,209,153,.3) !important;
}

/* locked state */
.dl-node.locked .dl-marker { border-color: #2a2a3e; background: #2a2a3e; }
.dl-node.locked .dl-icon { opacity: .35; }
.dl-node.locked .dl-card { opacity: .35; pointer-events: none; }
.dl-node.locked .dl-card::before { border-color: #2a2a3e !important; }

/* hover effects */
.dl-node:not(.locked) .dl-card:hover {
    border-color: #a78bfa; background: #232340;
    transform: translateX(4px);
}
.dl-node:not(.locked) .dl-card:hover::before { border-color: #a78bfa !important; }

.lesson-status { margin-top: 4px; }
.status-badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 20px;
    font-size: .78rem;
    font-weight: 500;
}
.status-badge.pass { background: rgba(52,211,153,.15); color: var(--green); }
.status-badge.fail { background: rgba(248,113,113,.15); color: var(--red); }
.status-badge.new { background: rgba(124,92,252,.1); color: var(--accent); }

.lesson-header .back-link { font-size: .82rem; color: var(--text-dim); margin-right: 12px; white-space: nowrap; }
.lesson-header .back-link:hover { color: var(--accent); }
.lesson-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 28px;
}
.lesson-header .lesson-meta { flex: 1; }
.lesson-header .lesson-num {
    font-family: 'JetBrains Mono', monospace;
    font-size: .85rem;
    color: var(--accent);
}
.lesson-header h1 { font-size: 1.5rem; font-weight: 600; }
.nav-link {
    padding: 8px 14px;
    border-radius: 8px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    font-size: .85rem;
    font-weight: 500;
    color: var(--text) !important;
    text-decoration: none;
    white-space: nowrap;
    transition: all .2s;
}
.nav-link:hover { background: var(--bg-hover); border-color: var(--accent); }
.nav-link.disabled { opacity: .3; pointer-events: none; }
.nav-link-nav {
    display: inline-block;
    margin-top: 8px;
    padding: 6px 12px;
    border-radius: 8px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    font-size: .82rem;
    font-weight: 500;
    color: var(--text-dim) !important;
    text-decoration: none;
    transition: all .2s;
}
.nav-link-nav:hover { border-color: var(--accent); color: var(--accent) !important; }
.nav-link-nav.disabled { opacity: .3; pointer-events: none; color: var(--text-dim) !important; }
.nav-refresh {
    font-size: .82rem;
    font-weight: 500;
    color: var(--accent2) !important;
    padding: 4px 10px;
    border-radius: 6px;
    border: 1px solid rgba(6,182,212,.2);
    transition: all .2s;
}
.nav-refresh:hover { background: rgba(6,182,212,.08); border-color: var(--accent2); }

.test-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 20px;
    margin-bottom: 20px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
}
.test-bar-status { font-size: .9rem; font-weight: 500; color: var(--text-dim); }
.test-bar-status.passed { color: var(--green); }
.btn-small {
    padding: 6px 16px;
    border-radius: 6px;
    font-size: .82rem;
    font-weight: 500;
    text-decoration: none !important;
    transition: all .2s;
    color: var(--text) !important;
    border: 1px solid var(--border);
}
.btn-small:hover { background: var(--bg-hover); }
.btn-small.btn-primary {
    background: linear-gradient(135deg, var(--accent), var(--accent-hover));
    color: #fff !important;
    border: none;
    box-shadow: 0 4px 16px var(--glow);
}
.btn-small.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 6px 20px var(--glow); }

.part-nav {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    margin-bottom: 20px;
    padding: 12px 20px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
}
.part-nav.bottom { margin-top: 20px; margin-bottom: 0; }
.part-link {
    padding: 6px 14px;
    border-radius: 6px;
    background: var(--bg-hover);
    font-size: .82rem;
    font-weight: 500;
    color: var(--text) !important;
    transition: all .2s;
}
.part-link:hover { background: var(--accent); color: #fff !important; }
.part-link.disabled { opacity: .3; pointer-events: none; }
.part-indicator {
    font-size: .85rem;
    font-weight: 600;
    color: var(--accent);
    font-family: 'JetBrains Mono', monospace;
    min-width: 60px;
    text-align: center;
}

.lesson-content {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px 36px;
    font-size: .95rem;
    line-height: 1.8;
    box-shadow: 0 4px 24px rgba(0,0,0,.2);
}
.lesson-content h2 {
    font-size: 1.3rem;
    margin: 32px 0 14px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border);
}
.lesson-content h2:first-child { margin-top: 0; }
.lesson-content h2:first-child { border-bottom-color: var(--accent); }
.lesson-content h3 { font-size: 1.1rem; margin: 24px 0 10px; }
.lesson-content p { margin-bottom: 14px; }
.lesson-content ul, .lesson-content ol { margin: 10px 0 14px 24px; }
.lesson-content li { margin-bottom: 6px; }
.lesson-content strong { color: #fff; }
.lesson-content code {
    background: rgba(124,92,252,.1);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'JetBrains Mono', monospace;
    font-size: .85rem;
}
.lesson-content pre {
    background: #0a0a0a;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 16px 20px;
    overflow-x: auto;
    margin: 14px 0;
}
.lesson-content pre code { background: none; padding: 0; }
.lesson-content hr {
    border: none;
    border-top: 1px solid var(--border);
    margin: 28px 0;
}
.lesson-content blockquote {
    border-left: 3px solid var(--accent);
    padding: 10px 18px;
    margin: 14px 0;
    background: rgba(124,92,252,.05);
    border-radius: 0 8px 8px 0;
    color: var(--text-dim);
}
.lesson-content .callout {
    display: flex; gap: 12px;
    padding: 14px 18px; margin: 18px 0;
    border-radius: 12px;
    border: 1px solid var(--border);
    position: relative;
}
.lesson-content .callout-icon {
    flex: 0 0 auto; width: 36px; height: 36px;
    display: flex; align-items: center; justify-content: center;
    border-radius: 50%;
    font-size: 1rem;
    background: rgba(124,92,252,.1);
}
.lesson-content .callout-body { flex: 1; min-width: 0; }
.lesson-content .callout-title {
    font-weight: 700; font-size: .85rem;
    display: inline;
}
.lesson-content .callout-body br + * { margin-top: 6px; display: inline-block; }

.lesson-content .callout-tip { border-color: rgba(6,182,212,.3); background: rgba(6,182,212,.04); }
.lesson-content .callout-tip .callout-icon { background: rgba(6,182,212,.12); }
.lesson-content .callout-tip .callout-title { color: #22d3ee; }

.lesson-content .callout-important { border-color: rgba(251,191,36,.3); background: rgba(251,191,36,.04); }
.lesson-content .callout-important .callout-icon { background: rgba(251,191,36,.12); }
.lesson-content .callout-important .callout-title { color: #fbbf24; }

.lesson-content .callout-note { border-color: rgba(148,163,184,.25); background: rgba(148,163,184,.03); }
.lesson-content .callout-note .callout-icon { background: rgba(148,163,184,.1); }
.lesson-content .callout-note .callout-title { color: #94a3b8; }

.lesson-content .callout-example { border-color: rgba(167,139,250,.3); background: rgba(167,139,250,.04); }
.lesson-content .callout-example .callout-icon { background: rgba(167,139,250,.12); }
.lesson-content .callout-example .callout-title { color: #a78bfa; }

.lesson-content .callout-interaction { border-color: rgba(52,211,153,.3); background: rgba(52,211,153,.04); }
.lesson-content .callout-interaction .callout-icon { background: rgba(52,211,153,.12); }
.lesson-content .callout-interaction .callout-title { color: #52d199; }

.lesson-content .callout-case { border-color: rgba(244,114,182,.3); background: rgba(244,114,182,.04); }
.lesson-content .callout-case .callout-icon { background: rgba(244,114,182,.12); }
.lesson-content .callout-case .callout-title { color: #f472b6; }
.lesson-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 14px 0;
    font-size: .9rem;
}
.lesson-content th, .lesson-content td {
    padding: 10px 14px;
    border: 1px solid var(--border);
    text-align: left;
}
.lesson-content th { background: var(--bg-hover); font-weight: 600; }

.lesson-action { text-align: center; margin: 32px 0; }
.lesson-passed {
    text-align: center;
    margin: 32px 0;
    padding: 16px;
    background: rgba(52,211,153,.08);
    border: 1px solid rgba(52,211,153,.2);
    border-radius: var(--radius);
    font-size: .95rem;
    box-shadow: 0 4px 20px rgba(52,211,153,.05);
}

.lesson-footer { margin-top: 40px; }
.lesson-footer h3 { font-size: .9rem; color: var(--text-dim); margin-bottom: 10px; }
.lesson-pager {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}
.pager-item {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 6px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    font-size: .8rem;
    font-family: 'JetBrains Mono', monospace;
    font-weight: 500;
    color: var(--text) !important;
    transition: all .15s;
}
.pager-item:hover { background: var(--bg-hover); }
.pager-item.active { background: linear-gradient(135deg, var(--accent), var(--accent-hover)); color: #fff !important; border-color: var(--accent); box-shadow: 0 2px 12px var(--glow); }
.pager-item.locked { opacity: .35; cursor: not-allowed; }

.test { max-width: 700px; margin: 0 auto; }
.test h1 { font-size: 1.4rem; margin-bottom: 8px; }
.test-info { color: var(--accent); font-size: .9rem; margin-bottom: 28px; }
.test-form { display: flex; flex-direction: column; gap: 24px; }

.question {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 22px 24px;
}
.q-text { font-weight: 600; font-size: 1rem; margin-bottom: 14px; }
.options { display: flex; flex-direction: column; gap: 8px; }
.option {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    border-radius: 6px;
    border: 1px solid var(--border);
    cursor: pointer;
    transition: all .15s;
    font-size: .92rem;
}
.option:hover { background: var(--bg-hover); }
.option input[type="radio"] { accent-color: var(--accent); }

.result { text-align: center; padding-top: 60px; }
.result h1 { font-size: 1.6rem; margin-bottom: 8px; }
.result-lesson { color: var(--text-dim); margin-bottom: 28px; }
.result-score {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 36px 48px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    margin-bottom: 32px;
    background: var(--bg-card);
}
.result-score.pass { border-color: rgba(52,211,153,.3); }
.result-score.fail { border-color: rgba(248,113,113,.2); }
.score-num {
    font-size: 2.4rem;
    font-weight: 700;
    font-family: 'JetBrains Mono', monospace;
}
.result-score.pass .score-num { color: var(--green); }
.result-score.fail .score-num { color: var(--red); }
.score-label { font-size: .95rem; color: var(--text-dim); }
.result-actions { display: flex; gap: 12px; justify-content: center; }

.admin h1 { font-size: 1.6rem; margin-bottom: 24px; }
.admin-section { margin-bottom: 36px; }
.admin-section h2 { font-size: 1.1rem; margin-bottom: 14px; color: var(--accent); }
.admin-table-wrap { overflow-x: auto; }
.admin-table { width: 100%; border-collapse: collapse; font-size: .85rem; }
.admin-table th, .admin-table td { padding: 8px 12px; border: 1px solid var(--border); text-align: center; }
.admin-table th { background: var(--bg-hover); font-weight: 600; white-space: nowrap; }
.admin-table td:first-child { text-align: left; font-weight: 500; white-space: nowrap; }
.cell-pass { background: rgba(52,211,153,.08); color: var(--green); }
.cell-fail { background: rgba(248,113,113,.08); color: var(--red); }
.cell-none { color: var(--text-dim); }

.admin-links { display: flex; flex-wrap: wrap; gap: 8px; }
.admin-link {
    padding: 8px 14px;
    border-radius: 6px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    font-size: .82rem;
    font-weight: 500;
    font-family: 'JetBrains Mono', monospace;
    color: var(--text) !important;
    transition: all .15s;
}
.admin-link:hover { border-color: var(--accent); background: var(--bg-hover); }

.aa-header { display: flex; align-items: center; gap: 16px; margin-bottom: 28px; }
.aa-header h1 { font-size: 1.3rem; flex: 1; }
.aa-question {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 22px 24px;
    margin-bottom: 16px;
}
.aa-q-text { font-weight: 600; font-size: 1rem; margin-bottom: 4px; }
.aa-type { font-size: .8rem; color: var(--text-dim); margin-bottom: 12px; }
.aa-options { display: flex; flex-direction: column; gap: 6px; }
.aa-options.inline { flex-direction: row; gap: 12px; }
.aa-option {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    border-radius: 6px;
    border: 1px solid var(--border);
    font-size: .92rem;
}
.aa-option.correct { border-color: var(--green); background: rgba(52,211,153,.08); }
.aa-opt-letter {
    width: 24px; height: 24px;
    display: flex; align-items: center; justify-content: center;
    border-radius: 4px;
    background: var(--bg-hover);
    font-size: .75rem; font-weight: 700;
    font-family: 'JetBrains Mono', monospace;
}
.aa-option.correct .aa-opt-letter { background: var(--green); color: #000; }
.aa-mark { color: var(--green); font-weight: 700; margin-left: auto; }
.aa-footer { text-align: center; margin-top: 24px; }

.refresh h1 { font-size: 1.5rem; margin-bottom: 4px; }
.refresh-info { color: var(--text-dim); font-size: .9rem; margin-bottom: 24px; }
.refresh-list { display: flex; flex-direction: column; gap: 16px; }
.refresh-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px 24px;
}
.refresh-meta { font-size: .78rem; color: var(--accent2); font-weight: 500; margin-bottom: 8px; }
.refresh-q { font-weight: 600; font-size: 1rem; margin-bottom: 14px; }
.refresh-options { display: flex; flex-direction: column; gap: 6px; }
.refresh-options.inline { flex-direction: row; gap: 12px; }
.refresh-opt {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 12px;
    border-radius: 6px;
    border: 1px solid var(--border);
    font-size: .9rem;
}
.refresh-opt.correct { border-color: var(--green); background: rgba(52,211,153,.06); }
.ro-letter {
    width: 22px; height: 22px;
    display: flex; align-items: center; justify-content: center;
    border-radius: 4px;
    background: var(--bg-hover);
    font-size: .7rem; font-weight: 700;
    font-family: 'JetBrains Mono', monospace;
}
.refresh-opt.correct .ro-letter { background: var(--green); color: #000; }
.ro-mark { color: var(--green); font-weight: 700; margin-left: auto; }
.refresh-empty { color: var(--text-dim); text-align: center; padding: 40px 0; }
.refresh-footer { text-align: center; margin-top: 24px; }

.refresh-test .rt-header {
    display: flex; justify-content: space-between; align-items: center;
    margin-bottom: 20px; padding: 10px 16px;
    background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
    font-size: .85rem;
}
.refresh-test .rt-counter { font-weight: 600; color: var(--accent); }
.refresh-test .rt-stats { color: var(--text-dim); }
.refresh-test .rt-stats b { color: var(--text); }
.rt-question-card {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 24px;
}
.rt-q-text { font-size: 1.1rem; font-weight: 600; margin-bottom: 20px; line-height: 1.5; }
.rt-form .rt-options { display: flex; flex-direction: column; gap: 8px; margin-bottom: 20px; }
.rt-form .rt-options.inline { flex-direction: row; gap: 16px; }
.rt-option {
    display: flex; align-items: center; gap: 10px;
    padding: 10px 14px; border-radius: 8px;
    border: 1px solid var(--border); cursor: pointer;
    transition: all .15s;
}
.rt-option:hover { border-color: var(--accent); background: var(--bg-hover); }
.rt-option input { accent-color: var(--accent); }
.rt-result-banner {
    text-align: center; padding: 12px; border-radius: var(--radius);
    font-size: 1.1rem; font-weight: 700; margin-bottom: 16px;
}
.rt-result-banner.correct { background: rgba(52,211,153,.12); color: var(--green); border: 1px solid var(--green); }
.rt-result-banner.incorrect { background: rgba(239,68,68,.12); color: var(--red); border: 1px solid var(--red); }
.rt-correct-answer {
    padding: 12px 16px; border-radius: var(--radius);
    background: var(--bg-hover); border: 1px solid var(--border);
    font-size: .9rem; margin-bottom: 20px; line-height: 1.5;
}
.rt-result {
    text-align: center; padding: 32px; margin: 20px 0;
}
.rt-score { margin-bottom: 8px; }
.rt-score-num { font-size: 3rem; font-weight: 800; color: var(--accent); }
.rt-score-label { display: block; font-size: .9rem; color: var(--text-dim); margin-top: 4px; }
.rt-detail { color: var(--text-dim); font-size: .9rem; }
.rt-actions { display: flex; gap: 12px; justify-content: center; margin-top: 24px; }
.rt-empty { color: var(--text-dim); text-align: center; padding: 40px 0; }

.ft-launch {
    text-align: center; padding: 32px; margin-top: 32px;
    background: linear-gradient(135deg, rgba(99,102,241,.08), rgba(6,182,212,.08));
    border: 2px solid var(--accent); border-radius: var(--radius);
}
.ft-launch h2 { font-size: 1.3rem; margin-bottom: 8px; color: var(--accent); }
.ft-launch p { color: var(--text-dim); margin-bottom: 16px; font-size: .9rem; }
.btn-lg { padding: 12px 32px; font-size: 1rem; }

.final-test h1 { font-size: 1.5rem; margin-bottom: 4px; }
.ft-info { color: var(--text-dim); font-size: .9rem; margin-bottom: 24px; }
.ft-question {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 20px 24px; margin-bottom: 16px;
}
.ft-q-text { font-weight: 600; font-size: 1rem; margin-bottom: 14px; line-height: 1.5; }
.ft-options { display: flex; flex-direction: column; gap: 8px; }
.ft-option {
    display: flex; align-items: center; gap: 10px;
    padding: 10px 14px; border-radius: 8px;
    border: 1px solid var(--border); cursor: pointer;
    transition: all .15s;
}
.ft-option:hover { border-color: var(--accent); background: var(--bg-hover); }
.ft-option input { accent-color: var(--accent); }
.ft-hint { font-size: .78rem; color: var(--accent2); margin-top: 8px; font-style: italic; }
.ft-submit { display: block; margin: 24px auto 0; padding: 12px 40px; font-size: 1rem; }

.ft-result { text-align: center; padding: 40px 0; }
.ft-result h1 { font-size: 1.5rem; margin-bottom: 20px; }
.ft-result-score { margin-bottom: 24px; }
.ft-result-score .ft-score-num { font-size: 3rem; font-weight: 800; display: block; }
.ft-result-score .ft-score-label { display: block; font-size: .9rem; color: var(--text-dim); margin-top: 4px; }
.ft-result-score.fail .ft-score-num { color: var(--red); }
.ft-result-actions { display: flex; gap: 12px; justify-content: center; }

.course-complete { max-width: 720px; margin: 0 auto; }
.cc-hero { text-align: center; margin-bottom: 32px; }
.cc-hero h1 { font-size: 1.6rem; font-weight: 700; }
.cc-subtitle { color: var(--text-dim); font-size: .95rem; margin-top: 6px; }
.cc-card {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 24px; margin-bottom: 20px;
}
.cc-card h2 { font-size: 1.15rem; margin-bottom: 14px; }
.cc-skills, .cc-areas { list-style: none; padding: 0; display: flex; flex-direction: column; gap: 8px; }
.cc-skills li, .cc-areas li {
    padding: 8px 12px; border-radius: 6px;
    border: 1px solid var(--border); font-size: .9rem; line-height: 1.5;
}
.cc-skills li::before { content: '▸ '; color: var(--accent); font-weight: 700; }
.cc-areas li::before { content: '▹ '; color: var(--accent2); font-weight: 700; }
.cc-footer {
    text-align: center; padding: 24px;
    color: var(--text-dim); font-size: .85rem; line-height: 1.6;
}
.cc-footer .btn { margin-top: 16px; }

@media (max-width: 700px) {
    .hero h1 { font-size: 2rem; }
    .features { grid-template-columns: 1fr; }
    .lesson-grid { grid-template-columns: 1fr; }
    .lesson-header { flex-wrap: wrap; }
    .lesson-content { padding: 20px; }
    .result-actions { flex-direction: column; align-items: center; }
    .aa-header { flex-wrap: wrap; }
    .admin-table { font-size: .75rem; }
    .admin-table th, .admin-table td { padding: 4px 6px; }
}