/* ---------- tokens ---------- */
:root {
  --bg: #f6f7fb; --bg2: #eef0f6; --panel: #ffffff; --panel2: #f8f9fc; --line: #e3e6ef; --line2: #d4d8e4;
  --text: #171a23; --text2: #3b4152; --muted: #6b7286; --faint: #9aa1b3;
  --accent: #6d4aff; --accent-soft: #6d4aff1a; --glow: 0 0 0 transparent;
  --done: #16a34a; --prog: #d97706; --todo: #94a3b8; --fail: #dc2626; --redo: #2563eb;
  --c-dsa: #7c3aed; --c-lld: #0891b2; --c-hld: #d97706; --c-java: #e11d48; --c-springboot: #16a34a; --c-root: #64748b; --c-all: #64748b;
  --heat0: #e9ecf3; --shadow: 0 1px 2px #0000000d, 0 8px 24px -12px #0000001f;
  --code-bg: #f3f4f9; --k: #7c3aed; --s: #0f766e; --c: #8a93a8; --n: #c2410c; --f: #2563eb; --t: #b45309; --a: #db2777;
  --radius: 14px;
}
:root[data-theme="dark"] {
  --bg: #0a0c11; --bg2: #0e1118; --panel: #12151d; --panel2: #161a24; --line: #212634; --line2: #2b3142;
  --text: #e8eaf2; --text2: #c3c8d6; --muted: #8a91a6; --faint: #5c6378;
  --accent: #8b6cff; --accent-soft: #8b6cff22;
  --done: #4ade80; --prog: #fbbf24; --todo: #64748b; --fail: #f87171; --redo: #60a5fa;
  --c-dsa: #a78bfa; --c-lld: #22d3ee; --c-hld: #fbbf24; --c-java: #fb7185; --c-springboot: #4ade80; --c-root: #94a3b8; --c-all: #94a3b8;
  --heat0: #171b26; --shadow: 0 1px 0 #ffffff08 inset, 0 10px 30px -15px #000000cc;
  --code-bg: #0d1017; --k: #c4a7ff; --s: #7ee0b5; --c: #5f6880; --n: #ffb27a; --f: #7cc4ff; --t: #ffd479; --a: #ff8fc8;
}

* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body {
  background: var(--bg); color: var(--text);
  font: 15px/1.6 Inter, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
}
:root[data-theme="dark"] body {
  background:
    radial-gradient(1200px 600px at 85% -10%, #6d4aff14, transparent 60%),
    radial-gradient(900px 500px at -10% 110%, #22d3ee0d, transparent 60%),
    var(--bg);
  background-attachment: fixed;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
button { font: inherit; color: inherit; }
kbd { font: 500 11px "JetBrains Mono", ui-monospace, Consolas, monospace; padding: 2px 6px; border: 1px solid var(--line2); border-bottom-width: 2px; border-radius: 6px; color: var(--muted); background: var(--panel2); }
::selection { background: var(--accent-soft); }

/* ---------- layout ---------- */
.app { display: flex; min-height: 100vh; }
.sidebar {
  position: sticky; top: 0; height: 100vh; width: 284px; flex: none; overflow-y: auto;
  border-right: 1px solid var(--line); background: color-mix(in srgb, var(--bg2) 85%, transparent);
  backdrop-filter: blur(10px); padding: 18px 12px 40px; scrollbar-width: thin;
}
.main { flex: 1; min-width: 0; display: flex; flex-direction: column; }
.topbar {
  position: sticky; top: 0; z-index: 20; display: flex; gap: 10px; align-items: center;
  padding: 12px 28px; background: color-mix(in srgb, var(--bg) 80%, transparent); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.view { padding: 28px; max-width: 1280px; width: 100%; margin: 0 auto; animation: fade .25s ease; }
@keyframes fade { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }
.scrim { display: none; }
.menu-btn { display: none; }

.icon-btn { border: 1px solid var(--line); background: var(--panel); border-radius: 10px; width: 38px; height: 38px; cursor: pointer; color: var(--muted); font-size: 16px; }
.icon-btn:hover { color: var(--text); border-color: var(--line2); }
.search-trigger {
  flex: 1; max-width: 560px; display: flex; align-items: center; gap: 10px; height: 38px; padding: 0 12px;
  border: 1px solid var(--line); background: var(--panel); border-radius: 10px; color: var(--faint); cursor: pointer; text-align: left;
}
.search-trigger span:nth-child(2) { flex: 1; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.search-trigger:hover { border-color: var(--line2); color: var(--muted); }
.search-ico { font-size: 18px; }
.topbar .icon-btn:last-child { margin-left: auto; }

/* ---------- sidebar ---------- */
.brand { display: flex; align-items: center; gap: 10px; padding: 4px 10px 18px; color: var(--text); }
.brand:hover { text-decoration: none; }
.brand-mark { width: 30px; height: 30px; border-radius: 9px; display: grid; place-items: center; background: linear-gradient(135deg, var(--accent), #22d3ee); color: #fff; font: 700 16px "Space Grotesk", Inter, system-ui, sans-serif; box-shadow: 0 6px 18px -6px var(--accent); }
.brand b { font: 700 18px "Space Grotesk", Inter, system-ui, sans-serif; letter-spacing: -.02em; }
.brand small { display: block; color: var(--faint); font-size: 11.5px; font-weight: 500; margin-top: -3px; }
.nav-label { font: 600 10.5px Inter; letter-spacing: .12em; text-transform: uppercase; color: var(--faint); padding: 16px 10px 6px; }
.nav-item { display: flex; align-items: center; gap: 10px; padding: 7px 10px; border-radius: 9px; color: var(--text2); font-weight: 500; font-size: 14px; cursor: pointer; }
.nav-item:hover { background: var(--panel2); text-decoration: none; color: var(--text); }
.nav-item.active { background: var(--accent-soft); color: var(--text); }
.nav-item .ico { width: 18px; text-align: center; opacity: .9; }
.nav-item .count { margin-left: auto; font: 600 11px "JetBrains Mono", ui-monospace, Consolas, monospace; color: var(--faint); }
.nav-item .count.hot { color: var(--fail); }
.dot { width: 9px; height: 9px; border-radius: 50%; flex: none; background: var(--tc, var(--c-root)); box-shadow: 0 0 10px var(--tc, transparent); }
.tree { margin: 2px 0 8px 14px; border-left: 1px solid var(--line); padding-left: 6px; }
.tree .node { display: flex; align-items: center; gap: 6px; padding: 3px 8px; border-radius: 7px; font-size: 13px; color: var(--muted); cursor: pointer; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.tree .node:hover { background: var(--panel2); color: var(--text); text-decoration: none; }
.tree .node.active { color: var(--text); background: var(--accent-soft); }
.tree .node .caret { width: 12px; font-size: 9px; color: var(--faint); transition: transform .15s; flex: none; }
.tree .node.open > .caret { transform: rotate(90deg); }
.tree .node .fi { font-size: 11px; opacity: .7; flex: none; }
.tree .kids { margin-left: 10px; }
.chev { margin-left: auto; font-size: 10px; color: var(--faint); transition: transform .15s; padding: 0 2px; }
.chev.open { transform: rotate(90deg); }

/* ---------- common ---------- */
.page-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 20px; margin: 4px 0 24px; flex-wrap: wrap; }
.eyebrow { font: 600 12px Inter; letter-spacing: .14em; text-transform: uppercase; color: var(--faint); }
h1.hero { font: 700 34px/1.15 "Space Grotesk", Inter, system-ui, sans-serif; letter-spacing: -.03em; margin: 6px 0 0; }
h1.hero .grad { background: linear-gradient(90deg, var(--accent), #22d3ee); -webkit-background-clip: text; background-clip: text; color: transparent; }
.sub { color: var(--muted); margin-top: 6px; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); }
.card-h { display: flex; align-items: center; justify-content: space-between; gap: 10px; padding: 16px 18px 6px; }
.card-h h3 { margin: 0; font: 600 15px "Space Grotesk", Inter, system-ui, sans-serif; letter-spacing: -.01em; display: flex; align-items: center; gap: 8px; }
.card-h .more { font-size: 12.5px; color: var(--muted); }
.card-b { padding: 8px 18px 18px; }
.grid { display: grid; gap: 18px; }
.g-12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }
.span-4 { grid-column: span 4; } .span-5 { grid-column: span 5; } .span-6 { grid-column: span 6; } .span-7 { grid-column: span 7; } .span-8 { grid-column: span 8; } .span-12 { grid-column: span 12; }
.chip { display: inline-flex; align-items: center; gap: 6px; padding: 2px 9px; border-radius: 999px; font: 600 11.5px Inter; border: 1px solid color-mix(in srgb, var(--tc, var(--muted)) 35%, transparent); color: var(--tc, var(--muted)); background: color-mix(in srgb, var(--tc, var(--muted)) 10%, transparent); white-space: nowrap; }
.chip.plain { --tc: var(--muted); }
.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.filter { cursor: pointer; padding: 5px 12px; font-size: 12.5px; }
.filter.on { background: color-mix(in srgb, var(--tc, var(--accent)) 22%, transparent); border-color: var(--tc, var(--accent)); }
.empty { color: var(--faint); font-size: 14px; padding: 12px 0; }
.mono { font-family: "JetBrains Mono", ui-monospace, Consolas, monospace; }
.muted { color: var(--muted); }

/* ---------- KPIs ---------- */
.kpis { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 18px; margin-bottom: 18px; }
.kpi { padding: 18px; position: relative; overflow: hidden; }
.kpi::after { content: ""; position: absolute; right: -30px; top: -30px; width: 110px; height: 110px; border-radius: 50%; background: radial-gradient(circle, var(--kc, var(--accent)) 0%, transparent 70%); opacity: .14; }
.kpi .lbl { font-size: 12.5px; color: var(--muted); font-weight: 500; display: flex; align-items: center; gap: 6px; }
.kpi .val { font: 700 34px/1.1 "Space Grotesk", Inter, system-ui, sans-serif; letter-spacing: -.03em; margin-top: 8px; }
.kpi .val small { font: 600 14px Inter; color: var(--muted); letter-spacing: 0; margin-left: 4px; }
.kpi .foot { font-size: 12.5px; color: var(--faint); margin-top: 6px; }
.kpi .foot b { color: var(--text2); font-weight: 600; }
.flame { display: inline-block; animation: flick 1.6s ease-in-out infinite; transform-origin: 50% 90%; }
@keyframes flick { 50% { transform: scale(1.12) rotate(-4deg); } }

/* ---------- revision cards ---------- */
.due-list { display: grid; gap: 10px; }
.due {
  display: grid; grid-template-columns: 4px 1fr auto; gap: 14px; align-items: start; padding: 12px 14px 12px 0;
  border: 1px solid var(--line); border-radius: 12px; background: var(--panel2); cursor: pointer; transition: transform .12s, border-color .12s;
  overflow: hidden;
}
.due:hover { transform: translateY(-1px); border-color: var(--line2); text-decoration: none; }
.due .bar { align-self: stretch; background: var(--uc, var(--todo)); border-radius: 0 4px 4px 0; }
.due .t { font-weight: 600; color: var(--text); font-size: 14.5px; line-height: 1.35; }
.due .n { color: var(--muted); font-size: 13px; margin-top: 4px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.due .n code { font-size: 11.5px; }
.due .meta { display: flex; gap: 6px; align-items: center; margin-top: 8px; flex-wrap: wrap; }
.due .when { text-align: right; font: 600 12px "JetBrains Mono", ui-monospace, Consolas, monospace; color: var(--uc, var(--muted)); white-space: nowrap; }
.due .when small { display: block; font: 500 11px Inter; color: var(--faint); margin-top: 2px; }
.u-over { --uc: var(--fail); } .u-today { --uc: var(--prog); } .u-soon { --uc: var(--redo); } .u-later { --uc: var(--todo); }
.upcoming { display: grid; gap: 2px; }
.up-row { display: grid; grid-template-columns: 54px 1fr auto; gap: 10px; align-items: center; padding: 8px 6px; border-radius: 9px; color: var(--text2); font-size: 13.5px; cursor: pointer; }
.up-row:hover { background: var(--panel2); text-decoration: none; }
.up-row .d { font: 600 11.5px "JetBrains Mono", ui-monospace, Consolas, monospace; color: var(--muted); text-align: center; line-height: 1.2; }
.up-row .d b { display: block; font: 700 17px "Space Grotesk", Inter, system-ui, sans-serif; color: var(--text); }
.up-row .ttl { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* ---------- heatmap ---------- */
.heat-wrap { overflow-x: auto; padding-bottom: 4px; }
.heat { display: grid; grid-auto-flow: column; grid-template-rows: repeat(7, 13px); gap: 3px; width: max-content; }
.heat i { width: 13px; height: 13px; border-radius: 3.5px; background: var(--heat0); display: block; }
.heat i.l1 { background: color-mix(in srgb, var(--accent) 35%, var(--heat0)); }
.heat i.l2 { background: color-mix(in srgb, var(--accent) 60%, var(--heat0)); }
.heat i.l3 { background: color-mix(in srgb, var(--accent) 85%, var(--heat0)); }
.heat i.l4 { background: var(--accent); box-shadow: 0 0 8px var(--accent); }
.heat i.today { outline: 1.5px solid var(--text2); outline-offset: 1px; }
.heat i.future { background: transparent; }
.heat-months { display: grid; grid-auto-flow: column; gap: 3px; font-size: 11px; color: var(--faint); margin-bottom: 4px; width: max-content; }
.heat-months span { width: 13px; overflow: visible; white-space: nowrap; }
.heat-legend { display: flex; align-items: center; gap: 4px; font-size: 11.5px; color: var(--faint); margin-top: 10px; justify-content: flex-end; }
.heat-legend i { width: 11px; height: 11px; border-radius: 3px; display: inline-block; }
.heat-row { display: flex; gap: 22px; align-items: flex-start; flex-wrap: wrap; }
.heat-stats { display: grid; gap: 12px; min-width: 170px; }
.heat-stats div { font-size: 12.5px; color: var(--muted); }
.heat-stats b { display: block; font: 700 22px "Space Grotesk", Inter, system-ui, sans-serif; color: var(--text); }

/* ---------- tracks ---------- */
.tracks { display: grid; grid-template-columns: repeat(auto-fill, minmax(190px, 1fr)); gap: 18px; }
.track-card { padding: 18px; cursor: pointer; position: relative; overflow: hidden; transition: transform .15s, border-color .15s; display: block; color: inherit; }
.track-card:hover { transform: translateY(-2px); border-color: color-mix(in srgb, var(--tc) 50%, var(--line)); text-decoration: none; }
.track-card::before { content: ""; position: absolute; inset: 0 0 auto; height: 3px; background: linear-gradient(90deg, var(--tc), transparent); }
.track-top { display: flex; align-items: center; gap: 14px; }
.track-top h4 { margin: 0; font: 700 18px "Space Grotesk", Inter, system-ui, sans-serif; letter-spacing: -.02em; }
.track-top p { margin: 2px 0 0; font-size: 12.5px; color: var(--muted); }
.ring { flex: none; }
.ring text { font: 700 14px "Space Grotesk", Inter, system-ui, sans-serif; fill: var(--text); }
.stackbar { display: flex; height: 7px; border-radius: 99px; overflow: hidden; background: var(--heat0); margin: 16px 0 10px; }
.stackbar span { display: block; height: 100%; }
.legend { display: flex; gap: 10px; flex-wrap: wrap; font-size: 12px; color: var(--muted); }
.legend span { display: inline-flex; gap: 4px; align-items: center; }
.legend i { width: 8px; height: 8px; border-radius: 2px; display: inline-block; }
.track-foot { display: flex; justify-content: space-between; font-size: 12px; color: var(--faint); margin-top: 12px; padding-top: 10px; border-top: 1px dashed var(--line); }
.track-foot b { color: var(--text2); font-weight: 600; }

/* ---------- contests ---------- */
.contest-chart svg { width: 100%; height: auto; display: block; }
.contest-chart .lbl { font: 600 11px Inter; fill: var(--muted); }
.contest-chart .val { font: 700 12px "Space Grotesk", Inter, system-ui, sans-serif; fill: var(--text); }
.contest-chart .grid-l { stroke: var(--line); stroke-dasharray: 3 4; }
.contest-chart a:hover rect.b { filter: brightness(1.15); }
.contest-rows { display: grid; gap: 8px; margin-top: 12px; }
.c-row { display: flex; align-items: center; gap: 10px; font-size: 13px; color: var(--text2); }
.c-row .pips { display: flex; gap: 4px; }
.c-row .pip { width: 18px; height: 18px; border-radius: 5px; display: grid; place-items: center; font: 700 10px "JetBrains Mono", ui-monospace, Consolas, monospace; color: var(--bg); background: var(--todo); }
.c-row .pip.ok { background: var(--done); } .c-row .pip.no { background: var(--fail); } .c-row .pip.na { background: var(--heat0); color: var(--faint); }

/* ---------- feed ---------- */
.feed { display: grid; gap: 0; }
.entry { display: grid; grid-template-columns: 62px 1fr; gap: 14px; padding: 14px 0; border-top: 1px solid var(--line); }
.entry:first-child { border-top: none; padding-top: 4px; }
.entry .when { font: 600 11.5px "JetBrains Mono", ui-monospace, Consolas, monospace; color: var(--faint); line-height: 1.25; padding-top: 3px; }
.entry .when b { display: block; font: 700 19px "Space Grotesk", Inter, system-ui, sans-serif; color: var(--text); }
.entry .body { min-width: 0; }
.entry .what { color: var(--text2); font-size: 14px; line-height: 1.6; max-height: 6.4em; overflow: hidden; position: relative; }
.entry .what::after { content: ""; position: absolute; inset: auto 0 0; height: 2em; background: linear-gradient(transparent, var(--panel)); }
.entry.open .what { max-height: none; }
.entry.open .what::after { display: none; }
.entry .what strong { color: var(--text); }
.entry .what code, .due code { font: 12.5px "JetBrains Mono", ui-monospace, Consolas, monospace; background: var(--code-bg); padding: 1px 5px; border-radius: 5px; border: 1px solid var(--line); }
.entry .links { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 8px; }
.entry .links a { font-size: 12px; padding: 2px 9px; border-radius: 7px; background: var(--panel2); border: 1px solid var(--line); color: var(--text2); }
.entry .links a:hover { border-color: var(--accent); text-decoration: none; }
.entry .top { display: flex; gap: 8px; align-items: center; margin-bottom: 6px; }
.expand { font-size: 12px; color: var(--accent); cursor: pointer; background: none; border: 0; padding: 4px 0 0; }
.week-h { display: flex; align-items: baseline; gap: 12px; margin: 26px 0 10px; }
.week-h h3 { margin: 0; font: 700 18px "Space Grotesk", Inter, system-ui, sans-serif; }
.week-h span { color: var(--faint); font-size: 13px; }

/* ---------- track page items ---------- */
.items { display: grid; grid-template-columns: repeat(auto-fill, minmax(270px, 1fr)); gap: 12px; }
.item { padding: 14px 16px; border-radius: 12px; border: 1px solid var(--line); background: var(--panel); cursor: pointer; position: relative; transition: transform .12s, border-color .12s; display: block; color: inherit; overflow: hidden; }
.item:hover { transform: translateY(-1px); border-color: var(--line2); text-decoration: none; }
.item::before { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 3px; background: var(--sc); }
.item .it { font-weight: 600; font-size: 14.5px; color: var(--text); display: flex; gap: 8px; align-items: flex-start; justify-content: space-between; }
.item .ii { font-size: 12.5px; color: var(--muted); margin-top: 6px; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.item .idue { margin-top: 10px; display: flex; gap: 6px; flex-wrap: wrap; }
.s-done { --sc: var(--done); } .s-prog { --sc: var(--prog); } .s-todo { --sc: var(--todo); } .s-fail { --sc: var(--fail); } .s-redo { --sc: var(--redo); }
.section-h { font: 600 13px Inter; color: var(--muted); letter-spacing: .06em; text-transform: uppercase; margin: 26px 0 12px; display: flex; align-items: center; gap: 10px; }
.section-h::after { content: ""; flex: 1; height: 1px; background: var(--line); }
.track-hero { display: flex; gap: 22px; align-items: center; padding: 22px; margin-bottom: 8px; position: relative; overflow: hidden; }
.track-hero::after { content: ""; position: absolute; right: -80px; top: -80px; width: 260px; height: 260px; border-radius: 50%; background: radial-gradient(circle, var(--tc), transparent 70%); opacity: .14; }
.track-hero h1 { margin: 0; font: 700 32px "Space Grotesk", Inter, system-ui, sans-serif; letter-spacing: -.03em; }
.stats-inline { display: flex; gap: 22px; margin-top: 10px; flex-wrap: wrap; }
.stats-inline div { font-size: 12.5px; color: var(--muted); }
.stats-inline b { display: block; font: 700 20px "Space Grotesk", Inter, system-ui, sans-serif; color: var(--text); }
details.readme { margin-top: 26px; }
details.readme > summary { cursor: pointer; list-style: none; padding: 14px 18px; font: 600 15px "Space Grotesk", Inter, system-ui, sans-serif; display: flex; align-items: center; gap: 8px; }
details.readme > summary::-webkit-details-marker { display: none; }
details.readme[open] > summary { border-bottom: 1px solid var(--line); }
details.readme .md { padding: 8px 26px 26px; }

/* ---------- doc ---------- */
.doc-wrap { display: grid; grid-template-columns: minmax(0, 1fr) 230px; gap: 40px; align-items: start; }
.crumbs { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; font-size: 13px; color: var(--faint); margin-bottom: 14px; }
.crumbs a { color: var(--muted); }
.crumbs .sep { opacity: .5; }
.doc-title { font: 700 36px/1.15 "Space Grotesk", Inter, system-ui, sans-serif; letter-spacing: -.03em; margin: 0 0 14px; }
.doc-meta { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin-bottom: 18px; }
.doc-tools { display: flex; gap: 8px; margin: 0 0 22px; flex-wrap: wrap; }
.btn { border: 1px solid var(--line); background: var(--panel); border-radius: 9px; padding: 6px 12px; font-size: 13px; font-weight: 500; cursor: pointer; color: var(--text2); display: inline-flex; gap: 6px; align-items: center; }
.btn:hover { border-color: var(--accent); color: var(--text); text-decoration: none; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.toc { position: sticky; top: 86px; max-height: calc(100vh - 110px); overflow-y: auto; font-size: 13px; border-left: 1px solid var(--line); padding-left: 14px; scrollbar-width: thin; }
.toc .tl { font: 600 11px Inter; letter-spacing: .12em; text-transform: uppercase; color: var(--faint); margin-bottom: 10px; }
.toc a { display: block; color: var(--muted); padding: 4px 0; line-height: 1.35; }
.toc a.h3 { padding-left: 12px; font-size: 12.5px; }
.toc a.on { color: var(--accent); font-weight: 600; }
.toc a:hover { color: var(--text); text-decoration: none; }

/* markdown body */
.md { font-size: 15.5px; line-height: 1.72; color: var(--text2); min-width: 0; }
.md > *:first-child { margin-top: 0; }
.md h1, .md h2, .md h3, .md h4 { font-family: "Space Grotesk", Inter, system-ui, sans-serif; color: var(--text); letter-spacing: -.02em; line-height: 1.25; scroll-margin-top: 80px; }
.md h1 { font-size: 28px; margin: 34px 0 14px; }
.md h2 { font-size: 23px; margin: 40px 0 14px; padding-bottom: 8px; border-bottom: 1px solid var(--line); }
.md h3 { font-size: 18.5px; margin: 28px 0 10px; }
.md h4 { font-size: 16px; margin: 22px 0 8px; }
.md h2 .anchor, .md h3 .anchor { opacity: 0; margin-left: 8px; color: var(--faint); font-weight: 400; }
.md h2:hover .anchor, .md h3:hover .anchor { opacity: 1; }
.md p { margin: 0 0 14px; }
.md strong { color: var(--text); font-weight: 650; }
.md ul, .md ol { padding-left: 24px; margin: 0 0 14px; }
.md li { margin: 4px 0; }
.md li::marker { color: var(--faint); }
.md hr { border: 0; border-top: 1px solid var(--line); margin: 30px 0; }
.md img { max-width: 100%; border-radius: 10px; }
.md :not(pre) > code { font: 13px "JetBrains Mono", ui-monospace, Consolas, monospace; background: var(--code-bg); border: 1px solid var(--line); padding: 1.5px 6px; border-radius: 6px; color: var(--text); white-space: break-spaces; }
.md blockquote { margin: 0 0 16px; padding: 12px 16px; border-left: 3px solid var(--accent); background: var(--accent-soft); border-radius: 0 10px 10px 0; color: var(--text2); }
.md blockquote > :last-child { margin-bottom: 0; }
.md blockquote h2 { font-size: 16px; border: 0; margin: 0 0 4px; padding: 0; }
.md .tbl { overflow-x: auto; margin: 0 0 18px; border: 1px solid var(--line); border-radius: 12px; background: var(--panel); }
.md table { border-collapse: collapse; width: 100%; font-size: 14px; }
.md th { text-align: left; font: 600 12px Inter; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); background: var(--panel2); padding: 10px 14px; border-bottom: 1px solid var(--line); white-space: nowrap; }
.md td { padding: 10px 14px; border-top: 1px solid var(--line); vertical-align: top; }
.md tr:first-child td { border-top: 0; }
.md tbody tr:hover td { background: color-mix(in srgb, var(--panel2) 70%, transparent); }
.md pre { position: relative; margin: 0 0 18px; background: var(--code-bg); border: 1px solid var(--line); border-radius: 12px; padding: 16px 18px; overflow-x: auto; font: 13.2px/1.65 "JetBrains Mono", ui-monospace, Consolas, monospace; color: var(--text); }
.md pre .lang { position: absolute; top: 8px; right: 12px; font: 600 10px Inter; text-transform: uppercase; letter-spacing: .1em; color: var(--faint); }
.copy { position: absolute; top: 8px; right: 10px; opacity: 0; transition: opacity .15s; font: 500 11px Inter; padding: 3px 9px; border-radius: 6px; border: 1px solid var(--line2); background: var(--panel); color: var(--muted); cursor: pointer; }
pre:hover .copy { opacity: 1; }
pre:hover .lang { opacity: 0; }
.tok-k { color: var(--k); } .tok-s { color: var(--s); } .tok-c { color: var(--c); font-style: italic; } .tok-n { color: var(--n); } .tok-f { color: var(--f); } .tok-t { color: var(--t); } .tok-a { color: var(--a); }

/* recall cards (<details>) */
.md details { margin: 0 0 10px; border: 1px solid var(--line); border-radius: 12px; background: var(--panel); overflow: hidden; transition: border-color .15s, box-shadow .15s; }
.md details:hover { border-color: var(--line2); }
.md details > summary { list-style: none; cursor: pointer; padding: 13px 16px 13px 46px; position: relative; font-weight: 600; color: var(--text); line-height: 1.45; }
.md details > summary::-webkit-details-marker { display: none; }
.md details > summary::before { content: "?"; position: absolute; left: 14px; top: 12px; width: 22px; height: 22px; border-radius: 7px; display: grid; place-items: center; font: 700 12px "Space Grotesk", Inter, system-ui, sans-serif; background: var(--accent-soft); color: var(--accent); transition: all .2s; }
.md details[open] > summary::before { content: "✓"; background: var(--done); color: var(--bg); }
.md details[open] { border-color: color-mix(in srgb, var(--done) 40%, var(--line)); box-shadow: 0 0 0 3px color-mix(in srgb, var(--done) 8%, transparent); }
.md details > :not(summary) { margin-left: 16px; margin-right: 16px; }
.md details > summary + * { margin-top: 2px; }
.md details[open] > :last-child { margin-bottom: 16px; }
.md details[open] > summary { border-bottom: 1px dashed var(--line); margin-bottom: 12px; }

/* code file view */
.codefile { font: 13.2px/1.65 "JetBrains Mono", ui-monospace, Consolas, monospace; background: var(--code-bg); border: 1px solid var(--line); border-radius: 12px; overflow-x: auto; padding: 14px 0; }
.codefile table { border-collapse: collapse; }
.codefile td.ln { user-select: none; text-align: right; color: var(--faint); padding: 0 14px 0 18px; vertical-align: top; opacity: .7; }
.codefile td.cl { white-space: pre; padding-right: 24px; color: var(--text); }

/* ---------- palette ---------- */
.palette { position: fixed; inset: 0; z-index: 100; background: #05070bb3; backdrop-filter: blur(6px); display: flex; justify-content: center; align-items: flex-start; padding-top: 12vh; }
.palette[hidden] { display: none; }
.palette-box { width: min(680px, calc(100vw - 32px)); background: var(--panel); border: 1px solid var(--line2); border-radius: 16px; box-shadow: 0 30px 80px -20px #000; overflow: hidden; animation: pop .16s ease; }
@keyframes pop { from { transform: scale(.98); opacity: 0; } }
.palette input { width: 100%; border: 0; outline: 0; background: transparent; color: var(--text); font: 500 17px Inter; padding: 18px 20px; border-bottom: 1px solid var(--line); }
.palette-results { max-height: 56vh; overflow-y: auto; padding: 6px; }
.pr { display: grid; grid-template-columns: auto 1fr; gap: 12px; padding: 10px 12px; border-radius: 10px; cursor: pointer; align-items: start; }
.pr.sel { background: var(--accent-soft); }
.pr .pt { font-weight: 600; color: var(--text); font-size: 14px; }
.pr .pp { font: 11.5px "JetBrains Mono", ui-monospace, Consolas, monospace; color: var(--faint); margin-top: 1px; }
.pr .ps { font-size: 12.5px; color: var(--muted); margin-top: 4px; }
.pr mark { background: color-mix(in srgb, var(--prog) 35%, transparent); color: var(--text); border-radius: 3px; padding: 0 2px; }
.palette-foot { display: flex; gap: 16px; padding: 10px 16px; border-top: 1px solid var(--line); font-size: 11.5px; color: var(--faint); }

.toast { position: fixed; bottom: 18px; right: 18px; background: var(--panel); border: 1px solid var(--line2); padding: 8px 14px; border-radius: 10px; font-size: 13px; box-shadow: var(--shadow); z-index: 90; }

/* ---------- responsive ---------- */
@media (max-width: 1100px) {
  .doc-wrap { grid-template-columns: minmax(0, 1fr); }
  .toc { display: none; }
  .span-4, .span-5, .span-7, .span-8 { grid-column: span 12; }
  .span-6 { grid-column: span 12; }
  .kpis { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 860px) {
  .sidebar { position: fixed; left: 0; top: 0; z-index: 60; transform: translateX(-100%); transition: transform .2s; background: var(--bg2); }
  body.nav-open .sidebar { transform: none; }
  body.nav-open .scrim { display: block; position: fixed; inset: 0; z-index: 50; background: #0008; }
  .menu-btn { display: block; }
  .view { padding: 18px 16px; }
  .topbar { padding: 10px 16px; }
  .search-trigger kbd { display: none; }
  h1.hero { font-size: 27px; }
  .doc-title { font-size: 28px; }
  .kpi .val { font-size: 28px; }
}

/* embedded study sheets (.html in the repo) */
.sheet-frame { display: block; width: 100%; height: calc(100vh - 150px); min-height: 520px; border: 1px solid var(--line); border-radius: 14px; background: var(--panel); box-shadow: var(--shadow); }