/* =========================================================
   Modern AI Era — Learning Hub · Design System
   ========================================================= */
:root,
[data-theme="dark"] {
  --bg: #0a0e17;
  --bg-elev: #0f1522;
  --card: #131b2b;
  --card-2: #182236;
  --border: #23314b;
  --text: #e6e9f2;
  --muted: #93a1b8;
  --faint: #5d6b84;
  --accent: #8b95ff;
  --accent-2: #2fd4ef;
  --good: #34d399;
  --warn: #fbbf24;
  --bad: #f87171;
  --code-bg: #0b1220;
  --shadow: 0 10px 30px rgba(0, 0, 0, .35);
  --d-fill: #18223a;
  --d-stroke: #3a4b6e;
  --grad: linear-gradient(135deg, #8b95ff 0%, #2fd4ef 100%);
  color-scheme: dark;
}

[data-theme="light"] {
  --bg: #f5f7fc;
  --bg-elev: #ffffff;
  --card: #ffffff;
  --card-2: #f1f4fb;
  --border: #dde3ef;
  --text: #121a2c;
  --muted: #4d5b74;
  --faint: #8a96ab;
  --accent: #4f46e5;
  --accent-2: #0891b2;
  --good: #059669;
  --warn: #b45309;
  --bad: #dc2626;
  --code-bg: #f3f5fa;
  --shadow: 0 10px 30px rgba(30, 41, 80, .10);
  --d-fill: #f3f6fd;
  --d-stroke: #b9c4da;
  --grad: linear-gradient(135deg, #4f46e5 0%, #0891b2 100%);
  color-scheme: light;
}

/* palette used by levels & diagrams */
.d-c-blue, .lvl-L1 { --c: #60a5fa; }
.d-c-purple, .lvl-L2 { --c: #a78bfa; }
.d-c-pink, .lvl-L3 { --c: #f472b6; }
.d-c-orange, .lvl-L4 { --c: #fb923c; }
.d-c-green, .lvl-L5 { --c: #34d399; }
.d-c-cyan, .lvl-L6 { --c: #22d3ee; }
.d-c-yellow, .lvl-L7 { --c: #facc15; }
.d-c-red, .lvl-L8 { --c: #f87171; }
.d-c-slate, .lvl-L0 { --c: #94a3b8; }
[data-theme="light"] .d-c-blue, [data-theme="light"] .lvl-L1 { --c: #2563eb; }
[data-theme="light"] .d-c-purple, [data-theme="light"] .lvl-L2 { --c: #7c3aed; }
[data-theme="light"] .d-c-pink, [data-theme="light"] .lvl-L3 { --c: #db2777; }
[data-theme="light"] .d-c-orange, [data-theme="light"] .lvl-L4 { --c: #ea580c; }
[data-theme="light"] .d-c-green, [data-theme="light"] .lvl-L5 { --c: #059669; }
[data-theme="light"] .d-c-cyan, [data-theme="light"] .lvl-L6 { --c: #0891b2; }
[data-theme="light"] .d-c-yellow, [data-theme="light"] .lvl-L7 { --c: #ca8a04; }
[data-theme="light"] .d-c-red, [data-theme="light"] .lvl-L8 { --c: #dc2626; }
[data-theme="light"] .d-c-slate, [data-theme="light"] .lvl-L0 { --c: #64748b; }

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.65 system-ui, -apple-system, "Segoe UI", Roboto, Ubuntu, "Noto Sans", sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
code, kbd, pre { font-family: ui-monospace, "JetBrains Mono", "Fira Code", Menlo, Consolas, monospace; }
code { background: var(--code-bg); border: 1px solid var(--border); border-radius: 6px; padding: .08em .38em; font-size: .88em; }
pre { background: var(--code-bg); border: 1px solid var(--border); border-radius: 12px; padding: 14px 16px; overflow: auto; font-size: .86em; line-height: 1.55; }
pre code { background: none; border: 0; padding: 0; }
kbd { border: 1px solid var(--border); border-bottom-width: 2px; border-radius: 5px; padding: 0 .4em; font-size: .85em; background: var(--card-2); }
hr { border: 0; border-top: 1px solid var(--border); margin: 2rem 0; }
table { width: 100%; border-collapse: collapse; margin: 1rem 0; font-size: .94em; }
th, td { border: 1px solid var(--border); padding: 8px 12px; text-align: left; vertical-align: top; }
th { background: var(--card-2); }
mark { background: color-mix(in srgb, var(--warn) 30%, transparent); color: inherit; border-radius: 3px; padding: 0 2px; }
button { font: inherit; color: inherit; }

/* ---------- Layout ---------- */
.app { display: grid; grid-template-columns: 300px 1fr; min-height: 100vh; }
.sidebar {
  position: sticky; top: 0; height: 100vh; overflow-y: auto;
  background: var(--bg-elev); border-right: 1px solid var(--border);
  padding: 18px 14px 40px;
}
.brand { display: flex; gap: 10px; align-items: center; color: var(--text); font-weight: 700; font-size: 1.05rem; padding: 4px 6px 14px; }
.brand:hover { text-decoration: none; }
.brand small { display: block; font-weight: 500; color: var(--muted); font-size: .74rem; letter-spacing: .02em; }
.logo { width: 36px; height: 36px; border-radius: 10px; background: var(--grad); display: grid; place-items: center; color: #fff; font-size: 18px; box-shadow: var(--shadow); flex: none; }
.overall { padding: 0 6px 14px; border-bottom: 1px solid var(--border); margin-bottom: 10px; }
.overall small { color: var(--muted); font-size: .78rem; }
.bar { height: 7px; background: var(--card-2); border-radius: 99px; overflow: hidden; border: 1px solid var(--border); }
.bar > span { display: block; height: 100%; width: 0; background: var(--grad); border-radius: 99px; transition: width .5s ease; }

.nav-level { margin: 2px 0; }
.nav-level > button {
  width: 100%; display: flex; align-items: center; gap: 8px; background: none; border: 0; cursor: pointer;
  padding: 7px 8px; border-radius: 8px; text-align: left; font-weight: 600; font-size: .9rem; color: var(--text);
}
.nav-level > button:hover { background: var(--card-2); }
.nav-level .lv-dot { width: 22px; height: 22px; border-radius: 7px; flex: none; display: grid; place-items: center; font-size: .72rem; font-weight: 800; color: var(--c); background: color-mix(in srgb, var(--c) 16%, transparent); border: 1px solid color-mix(in srgb, var(--c) 45%, transparent); }
.nav-level .lv-count { margin-left: auto; font-size: .72rem; color: var(--muted); font-weight: 500; }
.nav-level .chev { font-size: .7rem; color: var(--faint); transition: transform .2s; }
.nav-level.open .chev { transform: rotate(90deg); }
.nav-mods { display: none; padding: 2px 0 6px 12px; margin-left: 10px; border-left: 1px dashed var(--border); }
.nav-level.open .nav-mods { display: block; }
.nav-mods a { display: flex; gap: 8px; align-items: flex-start; padding: 5px 8px; border-radius: 7px; color: var(--muted); font-size: .84rem; line-height: 1.35; }
.nav-mods a:hover { background: var(--card-2); color: var(--text); text-decoration: none; }
.nav-mods a.active { background: color-mix(in srgb, var(--accent) 14%, transparent); color: var(--text); }
.nav-mods a .num { color: var(--faint); font-variant-numeric: tabular-nums; min-width: 26px; }
.nav-mods a .tick { margin-left: auto; color: var(--good); font-size: .8rem; }
.nav-mods a.soon { opacity: .5; }
.side-links { margin-top: 14px; padding-top: 12px; border-top: 1px solid var(--border); display: grid; gap: 2px; }
.side-links a { padding: 7px 10px; border-radius: 8px; color: var(--text); font-size: .9rem; }
.side-links a:hover { background: var(--card-2); text-decoration: none; }

.main-wrap { min-width: 0; }
.topbar {
  position: sticky; top: 0; z-index: 20; display: flex; gap: 10px; align-items: center;
  padding: 10px 24px; background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(12px); border-bottom: 1px solid var(--border);
}
.icon-btn { background: var(--card); border: 1px solid var(--border); border-radius: 10px; width: 38px; height: 38px; cursor: pointer; font-size: 1.05rem; flex: none; }
.icon-btn:hover { border-color: var(--accent); }
#menu-btn { display: none; }
.search { position: relative; flex: 1; max-width: 560px; }
.search input { width: 100%; height: 38px; border-radius: 10px; border: 1px solid var(--border); background: var(--card); color: var(--text); padding: 0 14px; font: inherit; font-size: .92rem; }
.search input:focus { outline: 2px solid color-mix(in srgb, var(--accent) 50%, transparent); border-color: var(--accent); }
.search-results { position: absolute; top: 44px; left: 0; right: 0; background: var(--card); border: 1px solid var(--border); border-radius: 12px; box-shadow: var(--shadow); max-height: 60vh; overflow: auto; padding: 6px; }
.search-results a { display: block; padding: 8px 10px; border-radius: 8px; color: var(--text); font-size: .9rem; }
.search-results a:hover, .search-results a.sel { background: var(--card-2); text-decoration: none; }
.search-results .kind { font-size: .7rem; text-transform: uppercase; letter-spacing: .06em; color: var(--faint); margin-right: 8px; }
.search-results .snip { display: block; color: var(--muted); font-size: .8rem; }
.topbar .spacer { flex: 1; }

.view { max-width: 920px; margin: 0 auto; padding: 32px 28px 120px; }
.view.wide { max-width: 1240px; }

/* ---------- Generic UI ---------- */
.pill { display: inline-flex; align-items: center; gap: 6px; padding: 3px 10px; border-radius: 99px; font-size: .76rem; font-weight: 600; border: 1px solid var(--border); background: var(--card); color: var(--muted); white-space: nowrap; }
.pill.beginner { color: var(--good); border-color: color-mix(in srgb, var(--good) 40%, transparent); }
.pill.intermediate { color: var(--warn); border-color: color-mix(in srgb, var(--warn) 40%, transparent); }
.pill.advanced { color: var(--bad); border-color: color-mix(in srgb, var(--bad) 40%, transparent); }
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 9px 16px; border-radius: 10px; border: 1px solid var(--border); background: var(--card); cursor: pointer; font-weight: 600; font-size: .9rem; color: var(--text); }
.btn:hover { border-color: var(--accent); text-decoration: none; }
.btn.primary { background: var(--grad); color: #fff; border: 0; }
.btn.primary:hover { filter: brightness(1.08); }
.btn.good { background: color-mix(in srgb, var(--good) 18%, transparent); border-color: var(--good); }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn.small { padding: 5px 11px; font-size: .82rem; }
.muted { color: var(--muted); }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }

/* ---------- Home ---------- */
.hero { position: relative; border-radius: 22px; padding: 38px 36px; overflow: hidden; border: 1px solid var(--border); background: radial-gradient(1200px 300px at 0% 0%, color-mix(in srgb, var(--accent) 22%, transparent), transparent), radial-gradient(800px 300px at 100% 100%, color-mix(in srgb, var(--accent-2) 18%, transparent), transparent), var(--card); }
.hero h1 { font-size: 2.3rem; line-height: 1.15; margin: 0 0 10px; letter-spacing: -.02em; }
.hero h1 .g { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero p { color: var(--muted); max-width: 640px; font-size: 1.05rem; margin: 0 0 22px; }
.hero .actions { display: flex; gap: 10px; flex-wrap: wrap; }
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin: 22px 0 8px; }
.stat { background: var(--card); border: 1px solid var(--border); border-radius: 14px; padding: 14px 16px; }
.stat b { display: block; font-size: 1.5rem; }
.stat span { color: var(--muted); font-size: .82rem; }
.section-title { display: flex; align-items: baseline; gap: 12px; margin: 38px 0 14px; }
.section-title h2 { margin: 0; font-size: 1.35rem; }
.section-title span { color: var(--muted); font-size: .9rem; }
.level-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 14px; }
.level-card { position: relative; display: block; padding: 18px; border-radius: 16px; border: 1px solid var(--border); background: var(--card); color: var(--text); transition: transform .15s, border-color .15s; overflow: hidden; }
.level-card::before { content: ""; position: absolute; inset: 0 0 auto 0; height: 3px; background: var(--c); }
.level-card:hover { transform: translateY(-2px); border-color: var(--c); text-decoration: none; }
.level-card .lv { font-size: .74rem; font-weight: 800; letter-spacing: .08em; color: var(--c); text-transform: uppercase; }
.level-card h3 { margin: 4px 0 4px; font-size: 1.08rem; }
.level-card p { margin: 0 0 14px; color: var(--muted); font-size: .86rem; line-height: 1.45; }
.level-card .meta { display: flex; justify-content: space-between; font-size: .76rem; color: var(--muted); margin-bottom: 6px; }
.level-card .bar > span { background: var(--c); }
.level-card.soon { opacity: .62; }
.tracks { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.track { padding: 18px; border-radius: 16px; border: 1px solid var(--border); background: var(--card); }
.track h3 { margin: 0 0 6px; font-size: 1rem; }
.track p { margin: 0 0 10px; color: var(--muted); font-size: .86rem; }
.track .chips { display: flex; flex-wrap: wrap; gap: 6px; }

/* ---------- Module page ---------- */
.crumbs { font-size: .84rem; color: var(--muted); margin-bottom: 10px; }
.crumbs a { color: var(--muted); }
.mod-head { margin-bottom: 26px; }
.mod-head .num { display: inline-block; font-weight: 800; font-size: .8rem; letter-spacing: .08em; color: var(--c); text-transform: uppercase; margin-bottom: 4px; }
.mod-head h1 { font-size: 2.1rem; line-height: 1.18; margin: 0 0 8px; letter-spacing: -.02em; }
.mod-head .tagline { font-size: 1.12rem; color: var(--muted); margin: 0 0 14px; }
.mod-head .pills { display: flex; flex-wrap: wrap; gap: 8px; }

.card { background: var(--card); border: 1px solid var(--border); border-radius: 16px; padding: 20px 22px; margin: 18px 0; }
.card > h2, .card > h3 { margin-top: 0; }
.card-label { display: flex; align-items: center; gap: 8px; font-size: .74rem; font-weight: 800; letter-spacing: .09em; text-transform: uppercase; color: var(--muted); margin-bottom: 8px; }
.card-label .ic { font-size: 1rem; }
.why { border-left: 4px solid var(--warn); }
.why .era { margin-left: auto; color: var(--warn); border-color: color-mix(in srgb, var(--warn) 45%, transparent); }
.analogy { border-left: 4px solid var(--accent-2); background: linear-gradient(90deg, color-mix(in srgb, var(--accent-2) 8%, var(--card)), var(--card)); }
.analogy h3 { margin: 0 0 6px; font-size: 1.15rem; }

.mod-section { margin: 34px 0; }
.mod-section > h2 { font-size: 1.45rem; margin: 0 0 12px; letter-spacing: -.01em; display: flex; gap: 10px; align-items: baseline; }
.mod-section > h2 .sn { color: var(--c); font-size: .95rem; font-weight: 800; }
.mod-section h3 { font-size: 1.1rem; margin: 22px 0 8px; }
.mod-section p, .mod-section li { color: color-mix(in srgb, var(--text) 92%, var(--muted)); }
.mod-section ul, .mod-section ol { padding-left: 1.3rem; }
.mod-section li { margin: 4px 0; }

.callout { display: flex; gap: 12px; padding: 14px 16px; border-radius: 12px; margin: 16px 0; border: 1px solid var(--border); background: var(--card-2); }
.callout .ic { font-size: 1.2rem; line-height: 1.4; }
.callout > div > :first-child { margin-top: 0; }
.callout > div > :last-child { margin-bottom: 0; }
.callout.tip { border-color: color-mix(in srgb, var(--good) 45%, transparent); background: color-mix(in srgb, var(--good) 7%, var(--card)); }
.callout.warn { border-color: color-mix(in srgb, var(--warn) 45%, transparent); background: color-mix(in srgb, var(--warn) 7%, var(--card)); }
.callout.key { border-color: color-mix(in srgb, var(--accent) 45%, transparent); background: color-mix(in srgb, var(--accent) 8%, var(--card)); }
.callout.example { border-color: color-mix(in srgb, var(--accent-2) 45%, transparent); background: color-mix(in srgb, var(--accent-2) 7%, var(--card)); }

details.deeper { border: 1px dashed var(--border); border-radius: 16px; padding: 4px 20px; margin: 22px 0; background: var(--card); }
details.deeper > summary { cursor: pointer; padding: 12px 0; font-weight: 700; list-style: none; display: flex; align-items: center; gap: 10px; }
details.deeper > summary::-webkit-details-marker { display: none; }
details.deeper > summary::before { content: "▸"; color: var(--accent); transition: transform .2s; }
details.deeper[open] > summary::before { transform: rotate(90deg); }
details.deeper > summary .pill { margin-left: auto; }
details.deeper .deep-item { padding-bottom: 8px; }
details.deeper .deep-item h3 { font-size: 1.04rem; margin: 14px 0 6px; }

.myths { display: grid; gap: 12px; }
.myth { display: grid; grid-template-columns: 1fr 1fr; border: 1px solid var(--border); border-radius: 14px; overflow: hidden; }
.myth > div { padding: 12px 16px; font-size: .93rem; }
.myth .m { background: color-mix(in srgb, var(--bad) 8%, var(--card)); }
.myth .t { background: color-mix(in srgb, var(--good) 8%, var(--card)); }
.myth b { display: block; font-size: .72rem; letter-spacing: .08em; text-transform: uppercase; margin-bottom: 4px; }
.myth .m b { color: var(--bad); }
.myth .t b { color: var(--good); }

.takeaways { list-style: none; padding: 0 !important; margin: 0; display: grid; gap: 8px; }
.takeaways li { display: flex; gap: 10px; padding: 10px 14px; border-radius: 12px; background: var(--card-2); border: 1px solid var(--border); }
.takeaways li::before { content: "✓"; color: var(--good); font-weight: 800; }

.tryit { border-left: 4px solid var(--good); }
.tryit ol { counter-reset: s; list-style: none; padding-left: 0 !important; }
.tryit ol > li { counter-increment: s; position: relative; padding-left: 40px; margin: 12px 0; }
.tryit ol > li::before { content: counter(s); position: absolute; left: 0; top: 0; width: 26px; height: 26px; border-radius: 8px; display: grid; place-items: center; font-size: .8rem; font-weight: 800; background: color-mix(in srgb, var(--good) 18%, transparent); color: var(--good); }
.tool-chips { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 6px; }

.terms { display: flex; flex-wrap: wrap; gap: 8px; }
.term-chip { padding: 5px 12px; border-radius: 99px; border: 1px solid var(--border); background: var(--card); font-size: .84rem; color: var(--text); cursor: help; position: relative; }
.term-chip:hover { border-color: var(--accent); text-decoration: none; }
.gl { border-bottom: 1px dotted var(--accent); cursor: help; color: inherit; }
.gl:hover { text-decoration: none; color: var(--accent); }
.tooltip { position: fixed; z-index: 100; max-width: 340px; background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 10px 14px; box-shadow: var(--shadow); font-size: .86rem; line-height: 1.5; pointer-events: none; }
.tooltip b { display: block; margin-bottom: 2px; }

.res-list { display: grid; gap: 10px; }
.res { display: flex; gap: 12px; align-items: flex-start; padding: 12px 14px; border: 1px solid var(--border); border-radius: 12px; background: var(--card); color: var(--text); }
.res:hover { border-color: var(--accent); text-decoration: none; }
.res .ic { font-size: 1.2rem; }
.res .t { font-weight: 600; }
.res .n { display: block; font-size: .84rem; color: var(--muted); }
.res .ty { margin-left: auto; }

.connects { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 10px; }
.conn { padding: 12px 14px; border: 1px solid var(--border); border-radius: 12px; background: var(--card); color: var(--text); }
.conn:hover { border-color: var(--c); text-decoration: none; }
.conn small { color: var(--c); font-weight: 700; display: block; }

.pager { display: flex; justify-content: space-between; gap: 12px; margin-top: 40px; }
.pager a { flex: 1; padding: 14px 18px; border-radius: 14px; border: 1px solid var(--border); background: var(--card); color: var(--text); }
.pager a:hover { border-color: var(--accent); text-decoration: none; }
.pager a small { display: block; color: var(--muted); font-size: .78rem; }
.pager a.next { text-align: right; }

.complete-bar { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; padding: 18px 20px; border-radius: 16px; border: 1px solid var(--border); background: var(--card); margin-top: 30px; }
.complete-bar .msg { flex: 1; color: var(--muted); font-size: .92rem; }
.notes textarea { width: 100%; min-height: 110px; resize: vertical; border-radius: 12px; border: 1px solid var(--border); background: var(--card-2); color: var(--text); padding: 12px; font: inherit; font-size: .92rem; }
.updated { font-size: .78rem; color: var(--faint); margin-top: 24px; }

/* ---------- Diagrams ---------- */
figure.diagram { margin: 22px 0; padding: 18px; border-radius: 16px; border: 1px solid var(--border); background: radial-gradient(600px 200px at 50% 0%, color-mix(in srgb, var(--accent) 6%, transparent), transparent), var(--card); text-align: center; overflow-x: auto; }
figure.diagram.bare { padding: 0; border: 0; background: none; }
figure.diagram figcaption { margin-top: 10px; color: var(--muted); font-size: .86rem; text-align: center; }
figure.diagram .fig-title { font-weight: 700; font-size: .95rem; margin-bottom: 10px; text-align: left; }
.d-svg { width: 100%; height: auto; display: block; margin: 0 auto; overflow: visible; }
.d-svg text { font-family: system-ui, -apple-system, "Segoe UI", Roboto, Ubuntu, sans-serif; }
.d-box { fill: var(--d-fill); stroke: var(--d-stroke); stroke-width: 1.5; }
.d-node[class*="d-c-"] .d-box, .d-box[class*="d-c-"] { fill: color-mix(in srgb, var(--c) 16%, var(--card)); stroke: var(--c); }
.d-text { fill: var(--text); font-size: 14px; font-weight: 650; }
.d-sub { fill: var(--muted); font-size: 12px; font-weight: 450; }
.d-label { fill: var(--muted); font-size: 11.5px; font-weight: 600; }
.d-label-bg { fill: var(--card); }
.d-title { fill: var(--text); font-size: 15px; font-weight: 750; }
.d-line { stroke: var(--faint); stroke-width: 1.7; fill: none; }
.d-line.accent { stroke: var(--accent); stroke-width: 2.2; }
.d-line.dashed { stroke-dasharray: 5 5; }
.d-line.thin { stroke-width: 1.1; }
.d-arrowhead { fill: var(--faint); }
.d-arrowhead.accent { fill: var(--accent); }
.d-area { fill: color-mix(in srgb, var(--c, var(--accent)) 7%, transparent); stroke: color-mix(in srgb, var(--c, var(--accent)) 55%, transparent); stroke-width: 1.4; stroke-dasharray: 6 5; }
.d-nest { fill: color-mix(in srgb, var(--c) 9%, transparent); stroke: var(--c); stroke-width: 1.6; }
.d-dot { fill: var(--c, var(--accent)); }
.d-grad-bar { stroke: var(--border); }
.d-hl .d-box, .d-box.d-hl { stroke: var(--accent) !important; stroke-width: 3; filter: drop-shadow(0 0 8px color-mix(in srgb, var(--accent) 70%, transparent)); }
.d-hl .d-text { fill: var(--accent); }
.d-dim { opacity: .35; }
@keyframes dash { to { stroke-dashoffset: -20; } }
.d-flowing { stroke-dasharray: 6 4; animation: dash 1s linear infinite; }

.d-compare { display: grid; grid-template-columns: repeat(var(--cols, 2), 1fr); gap: 12px; margin: 18px 0; text-align: left; }
.d-col { border: 1px solid color-mix(in srgb, var(--c) 45%, var(--border)); border-radius: 14px; background: color-mix(in srgb, var(--c) 6%, var(--card)); overflow: hidden; }
.d-col-h { padding: 10px 14px; font-weight: 750; color: var(--c); border-bottom: 1px solid color-mix(in srgb, var(--c) 30%, var(--border)); background: color-mix(in srgb, var(--c) 10%, transparent); }
.d-col-s { padding: 8px 14px 0; font-size: .84rem; color: var(--muted); }
.d-col ul { margin: 0; padding: 8px 14px 12px 30px; font-size: .9rem; }
.d-col li { margin: 5px 0; }

/* ---------- Widgets ---------- */
.widget { margin: 22px 0; border: 1px solid var(--border); border-radius: 16px; background: var(--card); overflow: hidden; }
.widget-head { display: flex; align-items: center; gap: 10px; padding: 12px 18px; border-bottom: 1px solid var(--border); background: var(--card-2); }
.widget-head .wt { font-weight: 750; font-size: .95rem; }
.widget-head .badge { font-size: .68rem; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; color: var(--accent-2); border: 1px solid color-mix(in srgb, var(--accent-2) 45%, transparent); padding: 2px 8px; border-radius: 99px; }
.widget-head .right { margin-left: auto; display: flex; gap: 6px; align-items: center; }
.widget-body { padding: 18px; }
.widget-foot { display: flex; align-items: center; gap: 10px; padding: 12px 18px; border-top: 1px solid var(--border); }
.widget-foot .grow { flex: 1; }
.widget label { font-size: .84rem; color: var(--muted); }
.widget input[type=range] { accent-color: var(--accent); width: 100%; }
.widget select, .widget textarea, .widget input[type=text] { background: var(--card-2); border: 1px solid var(--border); color: var(--text); border-radius: 10px; padding: 8px 10px; font: inherit; font-size: .9rem; }
.widget textarea { width: 100%; min-height: 90px; resize: vertical; }

.step-dots { display: flex; gap: 6px; }
.step-dots button { width: 10px; height: 10px; padding: 0; border-radius: 50%; border: 0; background: var(--border); cursor: pointer; }
.step-dots button.on { background: var(--accent); transform: scale(1.25); }
.step-title { font-weight: 750; font-size: 1.05rem; margin: 0 0 8px; }
.step-anim { animation: fadeUp .35s ease; }
@keyframes fadeUp { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

.tok-wrap { display: flex; flex-wrap: wrap; gap: 3px; line-height: 1.9; font-family: ui-monospace, Menlo, Consolas, monospace; font-size: .92rem; }
.tok { padding: 1px 3px; border-radius: 5px; white-space: pre; border: 1px solid transparent; }
.tok .id { display: block; font-size: .62rem; color: var(--muted); text-align: center; line-height: 1.1; }
.tok-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; margin-top: 14px; }
.tok-stats div { background: var(--card-2); border: 1px solid var(--border); border-radius: 12px; padding: 10px 12px; }
.tok-stats b { display: block; font-size: 1.25rem; }
.tok-stats span { color: var(--muted); font-size: .76rem; }

.prob-row { display: grid; grid-template-columns: 110px 1fr 56px; gap: 10px; align-items: center; margin: 6px 0; font-size: .9rem; }
.prob-row .w { font-family: ui-monospace, Menlo, monospace; text-align: right; }
.prob-row .pb { height: 22px; background: var(--card-2); border-radius: 6px; overflow: hidden; border: 1px solid var(--border); }
.prob-row .pb span { display: block; height: 100%; background: var(--grad); transition: width .35s ease; }
.prob-row .pv { font-variant-numeric: tabular-nums; color: var(--muted); font-size: .82rem; }
.prob-row.picked .w { color: var(--accent); font-weight: 800; }
.gen-out { font-size: 1.05rem; padding: 12px 14px; border-radius: 12px; background: var(--card-2); border: 1px solid var(--border); margin-bottom: 14px; min-height: 48px; }
.gen-out .new { color: var(--accent); font-weight: 700; background: color-mix(in srgb, var(--accent) 14%, transparent); border-radius: 4px; padding: 0 3px; }
.tally { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 10px; }
.tally span { padding: 3px 9px; border-radius: 99px; background: var(--card-2); border: 1px solid var(--border); font-size: .82rem; }

.budget-bar { display: flex; height: 36px; border-radius: 10px; overflow: hidden; border: 1px solid var(--border); background: var(--card-2); margin: 10px 0 6px; }
.budget-bar > div { height: 100%; transition: width .3s ease; position: relative; }
.budget-legend { display: grid; grid-template-columns: 1fr 1fr; gap: 10px 22px; margin-top: 14px; }
.budget-legend .row { display: grid; grid-template-columns: 14px 1fr auto; gap: 8px; align-items: center; font-size: .86rem; }
.budget-legend .sw { width: 14px; height: 14px; border-radius: 4px; }
.meter { display: flex; align-items: center; gap: 10px; padding: 10px 14px; border-radius: 12px; background: var(--card-2); border: 1px solid var(--border); margin-top: 12px; font-size: .9rem; }

.embed-svg { width: 100%; height: auto; background: var(--card-2); border-radius: 12px; border: 1px solid var(--border); }
.embed-svg .pt { cursor: pointer; }
.embed-svg .pt circle { transition: r .2s; }
.embed-svg .pt:hover circle { r: 8; }
.embed-svg text { font-size: 12px; fill: var(--text); font-weight: 600; pointer-events: none; }

.pb-toggles { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 14px; }
.pb-toggles button { padding: 6px 12px; border-radius: 99px; border: 1px solid var(--border); background: var(--card-2); cursor: pointer; font-size: .85rem; }
.pb-toggles button.on { background: color-mix(in srgb, var(--c, var(--accent)) 20%, transparent); border-color: var(--c, var(--accent)); color: var(--text); font-weight: 650; }
.pb-prompt { white-space: pre-wrap; font-size: .9rem; }
.pb-prompt .part { border-radius: 6px; padding: 1px 4px; }
.pb-out { white-space: pre-wrap; font-size: .9rem; padding: 12px 14px; border-radius: 12px; border: 1px solid var(--border); background: var(--card-2); }
.quality { height: 10px; border-radius: 99px; background: var(--card-2); border: 1px solid var(--border); overflow: hidden; flex: 1; }
.quality span { display: block; height: 100%; background: linear-gradient(90deg, var(--bad), var(--warn), var(--good)); background-size: 300px 100%; transition: width .35s; }

.dec-q { font-size: 1.08rem; font-weight: 700; margin-bottom: 12px; }
.dec-opts { display: grid; gap: 8px; }
.dec-opts button { text-align: left; padding: 11px 14px; border-radius: 12px; border: 1px solid var(--border); background: var(--card-2); cursor: pointer; }
.dec-opts button:hover { border-color: var(--accent); }
.dec-path { font-size: .78rem; color: var(--muted); margin-bottom: 10px; }
.dec-result { padding: 14px 16px; border-radius: 12px; border: 1px solid var(--good); background: color-mix(in srgb, var(--good) 9%, var(--card)); }
.dec-result h4 { margin: 0 0 6px; font-size: 1.1rem; }

.tabs-nav { display: flex; gap: 4px; padding: 8px 10px 0; border-bottom: 1px solid var(--border); background: var(--card-2); overflow-x: auto; }
.tabs-nav button { padding: 8px 14px; border: 0; background: none; cursor: pointer; border-bottom: 2px solid transparent; font-weight: 600; font-size: .88rem; color: var(--muted); white-space: nowrap; }
.tabs-nav button.on { color: var(--text); border-bottom-color: var(--accent); }

.flip-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 12px; }
.flip { perspective: 900px; height: 150px; cursor: pointer; }
.flip-inner { position: relative; width: 100%; height: 100%; transition: transform .5s; transform-style: preserve-3d; }
.flip.on .flip-inner { transform: rotateY(180deg); }
.flip-face { position: absolute; inset: 0; backface-visibility: hidden; border-radius: 14px; border: 1px solid var(--border); padding: 14px; display: grid; place-items: center; text-align: center; font-size: .9rem; overflow: auto; }
.flip-front { background: var(--card-2); font-weight: 700; font-size: 1rem; }
.flip-back { background: color-mix(in srgb, var(--accent) 10%, var(--card)); transform: rotateY(180deg); }

.reveal-item { border: 1px solid var(--border); border-radius: 12px; margin: 8px 0; overflow: hidden; }
.reveal-item button { width: 100%; text-align: left; padding: 11px 14px; background: var(--card-2); border: 0; cursor: pointer; font-weight: 650; }
.reveal-item .a { padding: 12px 14px; display: none; }
.reveal-item.on .a { display: block; animation: fadeUp .3s; }

.cls-item { font-size: 1.05rem; font-weight: 650; padding: 16px; border-radius: 12px; background: var(--card-2); border: 1px solid var(--border); text-align: center; margin-bottom: 12px; }
.cls-buckets { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 8px; }
.cls-buckets button { padding: 11px; border-radius: 12px; border: 1px solid var(--border); background: var(--card); cursor: pointer; font-weight: 650; }
.cls-buckets button:hover { border-color: var(--accent); }
.cls-fb { margin-top: 12px; padding: 12px 14px; border-radius: 12px; font-size: .92rem; }
.cls-fb.ok { background: color-mix(in srgb, var(--good) 10%, var(--card)); border: 1px solid var(--good); }
.cls-fb.no { background: color-mix(in srgb, var(--bad) 10%, var(--card)); border: 1px solid var(--bad); }

.chat { display: grid; gap: 10px; }
.msg { max-width: 86%; padding: 10px 14px; border-radius: 14px; font-size: .92rem; animation: fadeUp .3s ease; border: 1px solid var(--border); }
.msg .who { display: block; font-size: .68rem; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; margin-bottom: 3px; opacity: .8; }
.msg.user { justify-self: end; background: color-mix(in srgb, var(--accent) 16%, var(--card)); border-color: color-mix(in srgb, var(--accent) 40%, transparent); }
.msg.ai { justify-self: start; background: var(--card-2); }
.msg.system { justify-self: center; max-width: 100%; background: transparent; border-style: dashed; color: var(--muted); font-size: .84rem; }
.msg.tool { justify-self: start; background: color-mix(in srgb, var(--warn) 9%, var(--card)); border-color: color-mix(in srgb, var(--warn) 40%, transparent); font-family: ui-monospace, Menlo, monospace; font-size: .82rem; }
.msg.thought { justify-self: start; background: transparent; border-style: dashed; color: var(--muted); font-style: italic; }
.msg pre { margin: 6px 0 0; font-size: .8rem; }

/* ---------- Quiz ---------- */
.quiz-q { margin: 0 0 22px; }
.quiz-q .qt { font-weight: 700; margin-bottom: 10px; }
.quiz-q .qt .qn { color: var(--accent); margin-right: 6px; }
.quiz-opts { display: grid; gap: 8px; }
.quiz-opts button { text-align: left; padding: 10px 14px; border-radius: 12px; border: 1px solid var(--border); background: var(--card-2); cursor: pointer; display: flex; gap: 10px; }
.quiz-opts button:hover:not(:disabled) { border-color: var(--accent); }
.quiz-opts button .k { color: var(--faint); font-weight: 800; }
.quiz-opts button.correct { border-color: var(--good); background: color-mix(in srgb, var(--good) 12%, var(--card)); }
.quiz-opts button.wrong { border-color: var(--bad); background: color-mix(in srgb, var(--bad) 12%, var(--card)); }
.quiz-opts button:disabled { cursor: default; }
.quiz-explain { margin-top: 8px; padding: 10px 14px; border-radius: 10px; font-size: .9rem; background: var(--card-2); border-left: 3px solid var(--accent); animation: fadeUp .3s; }
.quiz-score { display: flex; align-items: center; gap: 14px; padding: 14px 16px; border-radius: 12px; background: var(--card-2); border: 1px solid var(--border); }
.quiz-score b { font-size: 1.4rem; }

/* ---------- Glossary / Map / Resources pages ---------- */
.page-head h1 { font-size: 2rem; margin: 0 0 6px; letter-spacing: -.02em; }
.page-head p { color: var(--muted); margin: 0 0 20px; }
.gl-tools { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; margin-bottom: 18px; }
.gl-tools input { flex: 1; min-width: 220px; height: 40px; border-radius: 10px; border: 1px solid var(--border); background: var(--card); color: var(--text); padding: 0 14px; font: inherit; }
.az { display: flex; flex-wrap: wrap; gap: 4px; margin-bottom: 16px; }
.az a { width: 28px; height: 28px; display: grid; place-items: center; border-radius: 7px; border: 1px solid var(--border); font-size: .8rem; color: var(--text); background: var(--card); }
.gl-letter { font-size: 1.3rem; font-weight: 800; color: var(--accent); margin: 26px 0 8px; }
.gl-item { padding: 12px 16px; border: 1px solid var(--border); border-radius: 12px; background: var(--card); margin: 8px 0; scroll-margin-top: 80px; }
.gl-item.flash { animation: flash 1.6s ease; }
@keyframes flash { 0%, 40% { border-color: var(--accent); box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 30%, transparent); } }
.gl-item .t { font-weight: 750; }
.gl-item .aka { color: var(--muted); font-size: .82rem; margin-left: 6px; }
.gl-item .d { margin: 4px 0 0; color: color-mix(in srgb, var(--text) 90%, var(--muted)); font-size: .93rem; }
.gl-item .from { font-size: .78rem; margin-top: 4px; display: inline-block; }

.map-wrap { overflow: auto; border: 1px solid var(--border); border-radius: 16px; background: var(--card); padding: 10px; }
.map-svg .mnode { cursor: pointer; }
.map-svg .mnode rect { fill: color-mix(in srgb, var(--c) 12%, var(--card)); stroke: color-mix(in srgb, var(--c) 70%, transparent); stroke-width: 1.4; }
.map-svg .mnode.done rect { fill: color-mix(in srgb, var(--c) 40%, var(--card)); stroke-width: 2.4; }
.map-svg .mnode.soon { opacity: .45; }
.map-svg .mnode:hover rect, .map-svg .mnode.focus rect { stroke: var(--accent); stroke-width: 3; }
.map-svg .mnode text { fill: var(--text); font-size: 11.5px; font-weight: 600; }
.map-svg .medge { stroke: var(--faint); stroke-width: 1.2; fill: none; opacity: .35; }
.map-svg .medge.on { stroke: var(--accent); opacity: 1; stroke-width: 2; }
.map-svg .mcol { fill: var(--c); font-size: 12px; font-weight: 800; letter-spacing: .06em; }

.empty { text-align: center; padding: 60px 20px; color: var(--muted); }
.empty .big { font-size: 3rem; }

/* ---------- Responsive ---------- */
@media (max-width: 980px) {
  .app { grid-template-columns: 1fr; }
  .sidebar { position: fixed; z-index: 50; width: 300px; left: -310px; transition: left .25s; box-shadow: var(--shadow); }
  .sidebar.open { left: 0; }
  #menu-btn { display: inline-block; }
  .stats, .tracks, .grid-3 { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .view { padding: 22px 16px 100px; }
  .hero { padding: 26px 20px; }
  .hero h1, .mod-head h1 { font-size: 1.6rem; }
  .stats, .tracks, .grid-2, .grid-3, .budget-legend, .tok-stats { grid-template-columns: 1fr 1fr; }
  .myth { grid-template-columns: 1fr; }
  .d-compare { grid-template-columns: 1fr; }
}
@media print {
  .sidebar, .topbar, .complete-bar, .notes, .pager { display: none !important; }
  .app { display: block; }
}