:root {
  --ground: #e9edf1;
  --surface: #ffffff;
  --ink: #1c2733;
  --muted: #5a6877;
  --rule: #c9d2db;
  --hn: #e85d0c;
  --taste: #0d7a68;
  --focus: #2457d6;
  --display: "Bricolage Grotesque", ui-sans-serif, system-ui, sans-serif;
  --read: "Source Serif 4", Georgia, serif;
  --gutter: 16px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --ground: #12171d; --surface: #1b222b; --ink: #e5eaf0; --muted: #94a2b1;
    --rule: #2f3a46; --hn: #ff7a26; --taste: #3cc4a9; --focus: #7aa2ff;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --ground: #12171d; --surface: #1b222b; --ink: #e5eaf0; --muted: #94a2b1;
  --rule: #2f3a46; --hn: #ff7a26; --taste: #3cc4a9; --focus: #7aa2ff;
  color-scheme: dark;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--ground); color: var(--ink);
  font: 400 15px/1.45 var(--display); font-optical-sizing: auto;
}
a { color: inherit; }
button { font: inherit; color: inherit; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }

/* Header */
.top {
  position: sticky; top: 0; z-index: 5; display: flex; align-items: center; gap: 16px;
  padding: 10px var(--gutter); background: var(--ground);
  border-bottom: 1px solid var(--rule);
}
.brand { display: flex; align-items: center; gap: 8px; text-decoration: none; font-weight: 700; font-size: 19px; letter-spacing: -0.01em; }
.brand svg { width: 24px; height: 24px; fill: var(--hn); }
.search { flex: 1; max-width: 560px; }
.search input {
  width: 100%; padding: 9px 14px; border: 1px solid var(--rule); border-radius: 999px;
  background: var(--surface); color: var(--ink); font: inherit;
}
.mode, .sort { display: flex; gap: 2px; padding: 3px; border-radius: 999px; background: var(--surface); border: 1px solid var(--rule); }
.mode button, .sort button {
  border: 0; background: transparent; padding: 6px 12px; border-radius: 999px; cursor: pointer; white-space: nowrap; color: var(--muted);
}
.mode button[aria-pressed="true"], .sort button[aria-pressed="true"] { background: var(--ink); color: var(--ground); }
.mode button:disabled, .sort button:disabled { opacity: .4; cursor: not-allowed; }

main { padding: 0 var(--gutter); max-width: 1600px; margin: 0 auto; }

.headline {
  font-weight: 600; font-size: clamp(26px, 4.2vw, 46px); line-height: 1.08; letter-spacing: -0.025em;
  max-width: 28ch; margin: 34px 0 22px;
}
.headline .n-hn { color: var(--hn); }
.headline .n-us { color: var(--taste); }

.banner { margin: 16px 0 0; padding: 10px 14px; border-left: 4px solid var(--hn); background: var(--surface); }

.chips { display: flex; gap: 8px; overflow-x: auto; padding-bottom: 6px; scrollbar-width: none; }
.chips::-webkit-scrollbar { display: none; }
.chip {
  flex: none; border: 1px solid var(--rule); background: var(--surface); border-radius: 8px;
  padding: 7px 12px; cursor: pointer;
}
.chip[aria-pressed="true"] { border-color: var(--ink); background: var(--ink); color: var(--ground); }
.chip.you { border-color: var(--taste); color: var(--taste); }
.chip.you[aria-pressed="true"] { background: var(--taste); color: var(--surface); }

.sortbar { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; margin: 14px 0 22px; }
.count { margin: 0; color: var(--muted); }
.empty { color: var(--muted); font-size: 17px; max-width: 60ch; }

/* Grid of videos */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(290px, 1fr)); gap: 30px 20px; }
.card { cursor: pointer; border-radius: 12px; outline-offset: 6px; min-width: 0; }
.thumb { position: relative; aspect-ratio: 16 / 9; border-radius: 12px; overflow: hidden; background: var(--rule); }
.thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
.dur, .seen {
  position: absolute; bottom: 8px; padding: 1px 6px; border-radius: 5px; font-size: 12px; font-weight: 600;
  background: rgba(10, 14, 18, .82); color: #fff;
}
.dur { right: 8px; }
.seen { left: 8px; }
.card.watched .thumb img { opacity: .55; }
.card h3 { font-size: 16px; font-weight: 600; line-height: 1.3; margin: 10px 0 2px;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.card .by { margin: 0; color: var(--muted); font-size: 14px; }
.card .why { margin: 6px 0 0; font-size: 14px; color: var(--ink); display: flex; gap: 8px; align-items: baseline; }
.card .why span:last-child { display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.liked-mark { color: var(--taste); font-weight: 700; }

.fit { display: inline-flex; gap: 3px; flex: none; transform: translateY(-1px); }
.fit i { width: 7px; height: 7px; border-radius: 50%; border: 1.5px solid var(--taste); }
.fit i.on { background: var(--taste); }

/* The HN strip: one bar per year since 2007, lit where HN recommended the video. */
.strip { display: flex; align-items: center; gap: 8px; margin-top: 8px; color: var(--muted); font-size: 13px; }
.strip svg { flex: none; height: 12px; }
.strip rect { fill: var(--rule); }
.strip rect.on { fill: var(--hn); }

.more { height: 1px; }
.foot { padding: 40px var(--gutter) 60px; color: var(--muted); font-size: 14px; max-width: 80ch; }
.foot p { margin: 6px 0; }
.linkish { background: none; border: 0; padding: 0; text-decoration: underline; cursor: pointer; color: var(--muted); margin-right: 14px; }

/* Player */
dialog { border: 0; padding: 0; color: var(--ink); background: var(--surface); }
dialog::backdrop { background: rgba(8, 12, 16, .72); }
.player { width: min(1040px, 100vw - 2 * var(--gutter)); max-height: calc(100vh - 32px); border-radius: 14px; overflow: auto; }
.frame { aspect-ratio: 16 / 9; background: #000; }
.frame iframe, .frame img { width: 100%; height: 100%; border: 0; display: block; object-fit: cover; }
.frame .noembed { position: relative; height: 100%; }
.frame .noembed p { position: absolute; inset: auto 0 0 0; margin: 0; padding: 14px; background: rgba(0,0,0,.75); color: #fff; }
.frame .noembed a { color: #fff; }
.p-body { padding: 18px 22px 26px; }
.p-head { display: flex; gap: 12px; align-items: flex-start; justify-content: space-between; }
.p-head h2 { margin: 0; font-size: 22px; line-height: 1.2; letter-spacing: -0.01em; }
.close { border: 0; background: none; font-size: 28px; line-height: 1; cursor: pointer; color: var(--muted); padding: 0 4px; }
.p-by { margin: 4px 0 0; color: var(--muted); }
.p-why { margin: 14px 0 0; font-size: 17px; font-weight: 600; color: var(--taste); max-width: 65ch; }
.p-sum { margin: 6px 0 0; max-width: 65ch; }
.p-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 12px; }
.p-tags span { border: 1px solid var(--rule); border-radius: 6px; padding: 2px 8px; font-size: 13px; color: var(--muted); }
.p-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 16px; }
.p-actions button, .p-actions a {
  border: 1px solid var(--rule); background: var(--ground); border-radius: 8px; padding: 7px 14px;
  cursor: pointer; text-decoration: none;
}
#p-like[aria-pressed="true"] { background: var(--taste); border-color: var(--taste); color: var(--surface); }
.p-hn { margin-top: 26px; padding-top: 18px; border-top: 1px solid var(--rule); }
.p-hn h3 { font-size: 16px; margin: 14px 0 8px; }
.p-strip .strip { margin-top: 0; font-size: 14px; }
.p-strip .strip svg { height: 18px; }
.quotes { list-style: none; padding: 0; margin: 0; display: grid; gap: 14px; }
.quotes li { font-family: var(--read); font-size: 16px; line-height: 1.55; max-width: 68ch; }
.quotes .who { display: block; font-family: var(--display); font-size: 13px; color: var(--muted); margin-top: 3px; }

.help { border-radius: 14px; padding: 22px 26px; width: min(420px, 100vw - 32px); }
.help h2 { margin: 0 0 12px; font-size: 20px; }
.help dl { display: grid; grid-template-columns: auto 1fr; gap: 6px 18px; margin: 0 0 18px; }
.help dt { font-weight: 700; }
.help dd { margin: 0; color: var(--muted); }
.help button { border: 1px solid var(--rule); background: var(--ground); border-radius: 8px; padding: 6px 14px; cursor: pointer; }

@media (prefers-reduced-motion: no-preference) {
  .player[open] { animation: rise .18s ease-out; }
  @keyframes rise { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: none; } }
}

@media (max-width: 720px) {
  .top { flex-wrap: wrap; gap: 10px; }
  .search { order: 3; flex-basis: 100%; max-width: none; }
  .mode { margin-left: auto; }
  .headline { margin-top: 22px; }
  .grid { grid-template-columns: 1fr; gap: 26px; }
  .p-body { padding: 14px 16px 22px; }
  .player { width: 100vw; max-height: 100vh; border-radius: 0; }
}

/* Long-form additions */
.sortbar .sort + .sort { margin-left: 0; }
#len { overflow-x: auto; scrollbar-width: none; max-width: 100%; }
#len::-webkit-scrollbar { display: none; }

/* A course looks like a stack of lectures. */
.thumb.stack { overflow: visible; box-shadow: 6px -6px 0 -1px var(--ground), 6px -6px 0 0 var(--rule), 12px -12px 0 -1px var(--ground), 12px -12px 0 0 var(--rule); margin: 12px 12px 0 0; }
.thumb.stack img { border-radius: 12px; }

.md { white-space: nowrap; font-size: 13px; padding: 0 7px; border-radius: 5px; margin-left: 4px; border: 1px solid var(--rule); color: var(--muted); }
.md-study { border-color: var(--ink); color: var(--ink); }

.p-card { display: grid; grid-template-columns: max-content 1fr; gap: 4px 16px; margin: 14px 0 0; max-width: 72ch; }
.p-card dt { color: var(--muted); }
.p-card dd { margin: 0; }

.p-course, .p-chapters { margin-top: 22px; }
.p-course-head { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; }
.p-course h3, .p-chapters h3 { font-size: 16px; margin: 0 0 8px; }
.p-course-head h3 { margin: 0; }
#p-continue { border: 1px solid var(--taste); background: var(--taste); color: var(--surface); border-radius: 8px; padding: 6px 14px; cursor: pointer; }
.lectures, .chapters { list-style: none; padding: 0; margin: 10px 0 0; max-height: 320px; overflow-y: auto; border-top: 1px solid var(--rule); }
.lectures li { display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 10px; padding: 6px 2px; border-bottom: 1px solid var(--rule); }
.lectures li input { width: 18px; height: 18px; accent-color: var(--taste); }
.lectures li button, .chapters button { border: 0; background: none; padding: 2px 0; text-align: left; cursor: pointer; }
.lectures li span { color: var(--muted); font-size: 13px; font-variant-numeric: tabular-nums; }
.lectures li.done button { color: var(--muted); text-decoration: line-through; }
.lectures li.now button { font-weight: 700; color: var(--taste); }
.chapters li { border-bottom: 1px solid var(--rule); }
.chapters button { width: 100%; padding: 6px 2px; }
.chapters button span { display: inline-block; min-width: 4.5em; color: var(--hn); font-variant-numeric: tabular-nums; }