:root {
    --ink: #17233a;
    --muted: #5c6b85;
    --line: #dfe5ee;
    --accent: #f0851e;
    --accent-dark: #d46f0d;
    --deep: #16233d;
    --ok: #1e8e5a;
    --bad: #c8452f;
    --bg: #f5f7fb;
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    background: var(--bg);
    color: var(--ink);
    font-family: "Segoe UI", system-ui, -apple-system, Roboto, Helvetica, Arial, sans-serif;
    font-size: 17px;
    line-height: 1.6;
}

.bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 14px 28px;
    background: var(--deep);
    color: #fff;
}

.bar__title { font-size: 17px; font-weight: 700; }

.bar__status {
    font-size: 12px;
    color: #b9c6dd;
    border: 1px solid #33405c;
    border-radius: 999px;
    padding: 3px 12px;
    white-space: nowrap;
}

.bar__status--live { color: #7ee0ab; border-color: #2c6244; }

.progress { height: 4px; background: #e2e7f0; }

.progress__fill {
    height: 100%;
    width: 0;
    background: var(--accent);
    transition: width .35s ease;
}

main {
    max-width: 900px;
    margin: 0 auto;
    padding: 28px 24px 120px;
}

h1 {
    font-size: 30px;
    line-height: 1.25;
    margin: 8px 0 18px;
}

h2 { font-size: 19px; margin: 0 0 8px; }

p { margin: 0 0 14px; }

.lede { font-size: 19px; color: var(--muted); }

figure {
    margin: 0 0 20px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 14px;
    overflow: hidden;
}

figure img { display: block; width: 100%; height: auto; }

figcaption {
    padding: 10px 14px;
    font-size: 13px;
    color: var(--muted);
    border-top: 1px solid var(--line);
}

.figure--right {
    float: right;
    width: 42%;
    margin: 0 0 16px 22px;
}

.callout, .fact {
    clear: both;
    background: #fff;
    border: 1px solid var(--line);
    border-left: 4px solid var(--accent);
    border-radius: 12px;
    padding: 16px 18px;
    margin: 20px 0 0;
}

.callout ul { margin: 0; padding-left: 20px; }

.fact__label {
    display: block;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: .08em;
    color: var(--accent-dark);
    font-weight: 700;
    margin-bottom: 4px;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 16px;
}

.card {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 14px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.card img { width: 100%; height: 150px; object-fit: cover; display: block; background: #0b1120; }

.card h2 { padding: 12px 14px 0; }

.card p { padding: 0 14px 14px; font-size: 15px; color: var(--muted); margin: 0; }

/* Quiz */
.q {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 18px 20px;
    margin-bottom: 14px;
}

.q__title { font-weight: 700; margin-bottom: 12px; }

.q__opt {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 9px 12px;
    border: 1px solid var(--line);
    border-radius: 9px;
    margin-bottom: 8px;
    cursor: pointer;
}

.q__opt:hover { border-color: var(--accent); background: #fffaf4; }

.q__opt input { margin-top: 4px; }

.q__opt--right { border-color: var(--ok); background: #f1faf5; }
.q__opt--wrong { border-color: var(--bad); background: #fdf3f1; }

.q__mark { font-size: 13px; font-weight: 700; margin-left: auto; white-space: nowrap; }
.q__mark--right { color: var(--ok); }
.q__mark--wrong { color: var(--bad); }

/* Result */
.result {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 26px;
    text-align: center;
    margin-bottom: 26px;
}

.result__score { font-size: 46px; font-weight: 800; line-height: 1; }
.result__verdict { font-size: 19px; font-weight: 700; margin-top: 8px; }
.result--pass .result__score, .result--pass .result__verdict { color: var(--ok); }
.result--fail .result__score, .result--fail .result__verdict { color: var(--bad); }
.result__note { color: var(--muted); font-size: 15px; margin-top: 10px; }

.credits-intro { color: var(--muted); font-size: 15px; }

.credits { padding-left: 18px; color: var(--muted); font-size: 13px; }
.credits li { margin-bottom: 5px; }
.credits a { color: var(--accent-dark); }

/* Nav */
.nav {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 12px 28px;
    background: #fff;
    border-top: 1px solid var(--line);
}

.nav__count { font-size: 13px; color: var(--muted); }

.btn {
    appearance: none;
    border: 0;
    border-radius: 10px;
    background: var(--accent);
    color: #fff;
    font: inherit;
    font-weight: 700;
    font-size: 15px;
    padding: 10px 26px;
    cursor: pointer;
}

.btn:hover { background: var(--accent-dark); }

.btn:disabled { opacity: .4; cursor: not-allowed; }

.btn--ghost { background: transparent; color: var(--muted); border: 1px solid var(--line); }
.btn--ghost:hover { background: #eef1f6; color: var(--ink); }

@media (max-width: 640px) {
    .figure--right { float: none; width: 100%; margin: 0 0 16px; }
    h1 { font-size: 25px; }
    main { padding: 20px 16px 110px; }
    .nav { padding: 10px 16px; }
}