:root {
  --bg: #ffffff; --bg2: #f4f4f5; --bg3: #e4e4e7; --text: #18181b; --muted: #63636b;
  --line: #e4e4e7; --accent: #c8102e; --accent-ink: #ffffff; --chip: #f4f4f5; --chip-on: #18181b; --chip-on-ink: #ffffff;
  --hover: rgba(0,0,0,.05); --link: #0b57d0; --ok: #1a7f37;
  --lvl-tech: #1a7f37; --lvl-gen: #0b57d0; --lvl-extra: #7a3e9d; --lvl-eng: #9a4a00;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f0f10; --bg2: #1f1f22; --bg3: #2e2e33; --text: #f1f1f1; --muted: #a1a1aa;
    --line: #2e2e33; --chip: #1f1f22; --chip-on: #f1f1f1; --chip-on-ink: #0f0f10;
    --hover: rgba(255,255,255,.08); --link: #7ab0ff; --ok: #4ade80;
    --lvl-tech: #4ade80; --lvl-gen: #7ab0ff; --lvl-extra: #c89bff; --lvl-eng: #ffb169;
  }
}
:root[data-theme="dark"] {
  --bg: #0f0f10; --bg2: #1f1f22; --bg3: #2e2e33; --text: #f1f1f1; --muted: #a1a1aa;
  --line: #2e2e33; --chip: #1f1f22; --chip-on: #f1f1f1; --chip-on-ink: #0f0f10;
  --hover: rgba(255,255,255,.08); --link: #7ab0ff; --ok: #4ade80;
  --lvl-tech: #4ade80; --lvl-gen: #7ab0ff; --lvl-extra: #c89bff; --lvl-eng: #ffb169;
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--text); }
body { font: 15px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; min-height: 100vh; display: flex; flex-direction: column; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
img { max-width: 100%; }

/* header */
.top { position: sticky; top: 0; z-index: 10; display: flex; align-items: center; gap: 16px; padding: 10px 16px; background: var(--bg); border-bottom: 1px solid var(--line); }
.brand { display: flex; align-items: center; gap: 8px; font-weight: 700; font-size: 20px; letter-spacing: -.5px; white-space: nowrap; }
.brand b { color: var(--accent); }
.brand-mark { display: grid; place-items: center; width: 30px; height: 30px; border-radius: 7px; background: var(--accent); color: var(--accent-ink); font-size: 17px; }
.search { flex: 1 1 auto; max-width: 560px; }
.search input { width: 100%; height: 38px; padding: 0 14px; font: inherit; color: var(--text); background: var(--bg2); border: 1px solid var(--line); border-radius: 19px; outline: none; }
.search input:focus { border-color: var(--link); }
.nav { display: flex; gap: 4px; margin-left: auto; }
.nav a { padding: 6px 10px; border-radius: 8px; color: var(--muted); font-weight: 500; white-space: nowrap; }
.nav a:hover { background: var(--hover); color: var(--text); }
.nav a.on { color: var(--text); background: var(--bg2); }
.nav a.ext { color: var(--accent); }
@media (max-width: 640px) { .top { flex-wrap: wrap; gap: 8px 12px; } .search { order: 3; flex: 1 1 100%; max-width: none; } .nav { margin-left: auto; } }

.view { flex: 1; width: 100%; max-width: 1280px; margin: 0 auto; padding: 16px; }
.loading, .empty { color: var(--muted); padding: 40px 0; text-align: center; }
.empty code { background: var(--bg2); padding: 2px 6px; border-radius: 4px; }

/* filters */
.filters { display: flex; flex-direction: column; gap: 8px; margin-bottom: 16px; }
.frow { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }
.flabel { font-size: 12px; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); min-width: 64px; }
.chip { height: 30px; padding: 0 12px; border-radius: 15px; background: var(--chip); font-weight: 500; font-size: 13px; white-space: nowrap; display: inline-flex; align-items: center; gap: 6px; border: 1px solid transparent; }
.chip:hover { background: var(--bg3); }
.chip.on { background: var(--chip-on); color: var(--chip-on-ink); }
.chip .n { opacity: .6; font-weight: 400; }
.chip.clear { color: var(--muted); background: transparent; border-color: var(--line); }
.summary { color: var(--muted); font-size: 14px; margin: 0 0 12px; }

/* grid */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 28px 18px; }
.card { display: block; min-width: 0; position: relative; }
.thumb { position: relative; aspect-ratio: 16/9; border-radius: 12px; overflow: hidden; background: var(--bg2); }
.thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
.card:hover .thumb img { transform: scale(1.02); transition: transform .2s; }
.dur, .seen { position: absolute; bottom: 8px; font-size: 12px; font-weight: 600; padding: 2px 6px; border-radius: 4px; background: rgba(0,0,0,.78); color: #fff; }
.dur { right: 8px; }
.seen { left: 8px; background: var(--ok); }
.card h3 { margin: 10px 0 2px; font-size: 15px; line-height: 1.35; font-weight: 600; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.meta { color: var(--muted); font-size: 13px; display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.lvl { font-size: 11px; font-weight: 700; letter-spacing: .04em; text-transform: uppercase; padding: 1px 7px; border-radius: 4px; border: 1px solid currentColor; }
.lvl-Technician { color: var(--lvl-tech); } .lvl-General { color: var(--lvl-gen); } .lvl-Advanced { color: var(--lvl-extra); }
.exam { font-size: 12px; color: var(--muted); }
.tabs .chip { height: 34px; font-size: 14px; }
.topic-sec { margin: 8px 0 32px; }
.topic-sec h2 { font-size: 18px; margin: 0 0 12px; display: flex; align-items: baseline; gap: 10px; }
.topic-sec h2 .n { color: var(--muted); font-size: 13px; font-weight: 400; }
.topic-sec h2 .all { color: var(--link); font-size: 13px; font-weight: 500; margin-left: auto; }
.blurb { margin: 6px 0 0; font-size: 13.5px; color: var(--muted); display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.more { text-align: center; margin: 28px 0; }
.btn { display: inline-flex; align-items: center; gap: 6px; height: 36px; padding: 0 16px; border-radius: 18px; background: var(--bg2); font-weight: 600; border: 1px solid var(--line); }
.btn:hover { background: var(--bg3); }
.btn.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.btn.on { background: var(--ok); color: #fff; border-color: var(--ok); }

/* watch */
.watch { display: grid; grid-template-columns: minmax(0, 2fr) minmax(280px, 1fr); gap: 28px; }
@media (max-width: 900px) { .watch { grid-template-columns: 1fr; } }
.player { aspect-ratio: 16/9; background: #000; border-radius: 12px; overflow: hidden; }
.player iframe { width: 100%; height: 100%; border: 0; display: block; }
.player .noembed { height: 100%; display: grid; place-items: center; color: #fff; }
.watch h1 { font-size: 22px; line-height: 1.3; margin: 14px 0 6px; }
.watch .meta { font-size: 14px; }
.facts { color: var(--muted); font-size: 13px; margin: 8px 0 0; }
.actions { display: flex; gap: 8px; flex-wrap: wrap; margin: 14px 0; }
.summary-box { background: var(--bg2); border-radius: 12px; padding: 14px 16px; margin: 12px 0; }
.summary-box p { margin: 0 0 6px; }
.why { color: var(--muted); font-style: italic; }
.topics a { margin-right: 6px; }
.side h2 { font-size: 15px; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); margin: 0 0 10px; }
.mention { border-top: 1px solid var(--line); padding: 12px 0; }
.mention:first-of-type { border-top: 0; }
.mention .who { font-size: 13px; color: var(--muted); display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.mention blockquote { margin: 6px 0; padding-left: 10px; border-left: 3px solid var(--bg3); font-size: 14px; }
.mention a.src { color: var(--link); font-size: 13px; }
.tag { font-size: 11px; padding: 1px 6px; border-radius: 4px; background: var(--bg2); color: var(--muted); font-weight: 600; }
.tag.strong_recommendation { color: var(--ok); } .tag.criticism { color: var(--accent); }
.score { font-variant-numeric: tabular-nums; }

/* start here */
.path { counter-reset: step; max-width: 900px; }
.path .step { display: grid; grid-template-columns: 40px 200px minmax(0, 1fr); gap: 16px; padding: 18px 0; border-top: 1px solid var(--line); align-items: start; }
.path .step:first-child { border-top: 0; }
.path .num { font-size: 22px; font-weight: 700; color: var(--accent); }
.path .thumb { border-radius: 8px; }
.path h3 { margin: 0 0 4px; font-size: 16px; }
.path p { margin: 6px 0 0; color: var(--muted); font-size: 14px; }
@media (max-width: 640px) { .path .step { grid-template-columns: 32px minmax(0, 1fr); } .path .thumb { grid-column: 2; } .path .body { grid-column: 2; } }
.intro { max-width: 720px; color: var(--muted); margin: 0 0 20px; }

/* about */
.prose { max-width: 760px; }
.prose h1 { font-size: 26px; } .prose h2 { font-size: 18px; margin-top: 28px; }
.prose a { color: var(--link); }
.prose li { margin: 4px 0; }
.foot { border-top: 1px solid var(--line); color: var(--muted); font-size: 13px; padding: 14px 16px; display: flex; gap: 16px; flex-wrap: wrap; justify-content: space-between; }
.foot a { color: var(--link); }