:root {
  --bg: #F3F5F8; --fg: #14203A; --muted: #586379; --line: #D8DEE7; --panel: #FFFFFF;
  --accent: #A9660F; --accent-fill: #EFA43A; --accent-soft: #FBE9CC; --focus: #2E5BDA;
  --f-display: "Bricolage Grotesque", "Segoe UI", sans-serif;
  --f-body: "IBM Plex Sans", "Segoe UI", Roboto, sans-serif;
  --f-mono: "IBM Plex Mono", ui-monospace, monospace;
}
@media (prefers-color-scheme: dark) { :root {
  --bg: #0E1524; --fg: #E5E9F1; --muted: #9AA4B8; --line: #26304A; --panel: #161F33;
  --accent: #F2B55A; --accent-soft: #3A2C14; --focus: #8EA9FF; color-scheme: dark } }
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 17px/1.6 var(--f-body); }
a { color: inherit; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; border-radius: 6px; }
.top, main, .foot { max-width: 1080px; margin: 0 auto; padding-inline: max(16px, env(safe-area-inset-left)); }
.top { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 20px; padding-block: 18px; font-size: 14px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-family: var(--f-mono); letter-spacing: .08em; text-transform: uppercase; text-decoration: none; font-weight: 500; }
.brand b { width: 14px; height: 14px; border-radius: 4px; background: var(--accent-fill); }
.top nav { display: flex; flex-wrap: wrap; gap: 8px; color: var(--muted); }
.top nav i { font-style: normal; opacity: .5; }
.top nav a { text-decoration: none; } .top nav a:hover { color: var(--accent); }
.label { display: block; font-family: var(--f-mono); font-size: 12px; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); }
h1 { font-family: var(--f-display); font-weight: 800; font-size: clamp(34px, 6vw, 58px); line-height: 1.03; letter-spacing: -0.02em; margin: 10px 0 14px; text-wrap: balance; }
h2 { font-family: var(--f-display); font-weight: 700; font-size: clamp(24px, 3.4vw, 32px); line-height: 1.15; margin: 0 0 10px; text-wrap: balance; }
.lede { font-size: clamp(18px, 2.2vw, 21px); color: var(--muted); max-width: 62ch; margin: 0; }
.hero { padding-block: 36px 28px; }
.pfacts { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 12px; margin: 28px 0 0; }
.pfacts div { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 14px 16px; }
.pfacts dt { font-family: var(--f-mono); font-size: 12px; letter-spacing: .06em; text-transform: uppercase; color: var(--muted); }
.pfacts dd { margin: 4px 0 0; font-weight: 600; }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 18px; padding-bottom: 40px; }
.pcard { display: block; background: var(--panel); border: 1px solid var(--line); border-radius: 16px; padding: 24px; text-decoration: none; }
a.pcard:hover { border-color: var(--accent); }
.pcard h2 { margin-top: 8px; } .pcard p { color: var(--muted); margin: 0 0 14px; }
.pcard .go { color: var(--accent); font-weight: 600; } .pcard.soon { border-style: dashed; background: transparent; }

.ptrack { padding-block: 26px; border-top: 1px solid var(--line); display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.7fr); gap: 16px 40px; }
.thead p { color: var(--muted); margin: 0; }
.chlist { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.chlist a, .chlist li > div { display: grid; grid-template-columns: 34px 1fr auto; gap: 12px; align-items: baseline; padding: 12px 14px; border: 1px solid var(--line); border-radius: 12px; background: var(--panel); text-decoration: none; }
.chlist a:hover { border-color: var(--accent); }
.chlist .n { font-family: var(--f-display); font-weight: 800; font-size: 22px; color: var(--accent); }
.chlist .t { font-weight: 600; } .chlist .t small { display: block; font-weight: 400; color: var(--muted); font-size: 14px; }
.chlist .d { font-family: var(--f-mono); font-size: 12px; color: var(--muted); white-space: nowrap; }
.chlist .soon > div { background: transparent; border-style: dashed; color: var(--muted); } .chlist .soon .n { color: var(--muted); }

.chapter { max-width: 900px; margin: 0 auto; padding-bottom: 40px; }
.chead { padding-block: 24px 22px; }
.player { background: #000; border-radius: 16px; overflow: hidden; border: 1px solid var(--line); }
.player video { display: block; width: 100%; aspect-ratio: 16 / 9; background: #EEF2F6; }
.outline ol { list-style: none; margin: 14px 0 0; padding: 0; display: flex; flex-wrap: wrap; gap: 8px; }
.outline button, .jump, .replay { font: inherit; font-size: 14px; cursor: pointer; color: var(--fg); background: var(--panel); border: 1px solid var(--line); border-radius: 999px; padding: 6px 14px; }
.outline button:hover, .jump:hover, .replay:hover { border-color: var(--accent); }
.outline button[aria-current="true"] { background: var(--accent-soft); border-color: var(--accent); font-weight: 600; }
.outline .ts { font-family: var(--f-mono); font-size: 12px; color: var(--muted); margin-right: 8px; }
.readhead { margin-top: 56px; padding-top: 28px; border-top: 1px solid var(--line); } .readhead p { color: var(--muted); margin: 0; }
.sc { padding-block: 34px; border-bottom: 1px solid var(--line); scroll-margin-top: 16px; }
.sc-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 12px; }
.ref { font-family: var(--f-mono); font-size: 13px; color: var(--accent); border: 1px solid var(--accent); border-radius: 999px; padding: 3px 12px; }
.jump { font-family: var(--f-mono); font-size: 13px; margin-left: auto; }
.cap { font-size: 19px; font-weight: 500; margin: 0 0 18px; max-width: 65ch; }
.more { color: var(--muted); margin: 18px 0 0; max-width: 68ch; }
.viz { display: flex; flex-direction: column; align-items: flex-end; gap: 8px; } .viz .astage-wrap { width: 100%; }
.replay { font-size: 12px; padding: 4px 10px; }
.nextch { display: block; margin-top: 34px; background: var(--panel); border: 1px solid var(--line); border-radius: 16px; padding: 20px 24px; text-decoration: none; font-family: var(--f-display); font-weight: 700; font-size: 24px; }
.nextch:hover { border-color: var(--accent); } .nextch .label { margin-bottom: 4px; }
.foot { padding-block: 26px 48px; color: var(--muted); font-size: 13px; }
@media (max-width: 760px) { .ptrack { grid-template-columns: 1fr; } }

.tracknav { display: flex; flex-wrap: wrap; gap: 8px; margin: 22px 0 0; }
.tracknav a { text-decoration: none; font-size: 14px; font-weight: 600; background: var(--panel); border: 1px solid var(--line); border-radius: 999px; padding: 7px 16px; }
.tracknav a:hover { border-color: var(--accent); color: var(--accent); }
.refgroup { padding-block: 26px; border-top: 1px solid var(--line); }
.reflist { margin: 14px 0 0; display: grid; gap: 10px; }
.reflist div { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 14px 18px; display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 2.2fr); gap: 6px 24px; }
.reflist dt { font-weight: 600; display: flex; gap: 10px; align-items: baseline; flex-wrap: wrap; }
.reflist dd { margin: 0; color: var(--muted); }
.reflist dd a { color: var(--accent); font-weight: 600; text-decoration: none; white-space: nowrap; }
@media (max-width: 760px) { .reflist div { grid-template-columns: 1fr; } }
.player video::cue { font-size: 64%; }