:root {
  --bg: #f7f5f0;
  --surface: #ffffff;
  --surface-2: #f0ece3;
  --ink: #1d1b17;
  --muted: #6b655a;
  --line: #e6e0d4;
  --accent: #b45309;
  --accent-soft: #fdecd3;
  --done: #15803d;
  --done-soft: #dcf2e3;
  --active: #1d4ed8;
  --active-soft: #dde7fb;
  --radius: 12px;
  --font-body: "Inter", system-ui, -apple-system, sans-serif;
  --font-head: "Space Grotesk", var(--font-body);
  --font-mono: "JetBrains Mono", ui-monospace, monospace;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0d1117;
    --surface: #151b23;
    --surface-2: #1c2430;
    --ink: #e8e5de;
    --muted: #9aa3ae;
    --line: #242d3a;
    --accent: #f5b544;
    --accent-soft: #3a2a0e;
    --done: #4ade80;
    --done-soft: #12301d;
    --active: #7aa7ff;
    --active-soft: #172743;
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --bg: #0d1117;
  --surface: #151b23;
  --surface-2: #1c2430;
  --ink: #e8e5de;
  --muted: #9aa3ae;
  --line: #242d3a;
  --accent: #f5b544;
  --accent-soft: #3a2a0e;
  --done: #4ade80;
  --done-soft: #12301d;
  --active: #7aa7ff;
  --active-soft: #172743;
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 400 16px/1.6 var(--font-body);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: var(--accent); text-underline-offset: 3px; }

.wrap { width: 100%; max-width: 1080px; margin: 0 auto; padding: 0 16px; }
@media (min-width: 720px) { .wrap { padding: 0 32px; } }

/* Top bar */
.topbar { position: sticky; top: 0; z-index: 10; background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: blur(8px); border-bottom: 1px solid var(--line); }
.topbar-inner { display: flex; align-items: center; justify-content: space-between; gap: 12px; height: 56px; }
.brand { display: flex; align-items: center; gap: 8px; color: var(--ink); text-decoration: none; font: 700 15px/1 var(--font-head); white-space: nowrap; }
.brand-star { width: 20px; height: 20px; fill: var(--accent); flex: none; }
.nav { display: flex; align-items: center; gap: 4px; }
.nav a { color: var(--muted); text-decoration: none; font-size: 14px; padding: 6px 8px; border-radius: 8px; }
.nav a:hover { color: var(--ink); background: var(--surface-2); }
.theme-toggle { border: 1px solid var(--line); background: transparent; color: var(--ink); border-radius: 8px; width: 32px; height: 32px; cursor: pointer; }
@media (max-width: 560px) { .brand span { display: none; } }

/* Hero */
.hero { padding-top: 64px; padding-bottom: 8px; }
h1 { font: 700 clamp(36px, 7vw, 60px)/1.05 var(--font-head); letter-spacing: -0.02em; margin: 0 0 18px; }
.focus { font-size: clamp(17px, 2.2vw, 19px); color: var(--muted); max-width: 62ch; margin: 0 0 32px; }

.arc { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 8px 4px; align-items: stretch; }
.arc li { flex: 1 1 200px; display: flex; gap: 10px; align-items: flex-start; }
.arc li:not(:last-child)::after { content: "→"; color: var(--accent); margin-top: 1px; }
.arc-step { flex: 1; }
.arc-step strong { display: block; font: 700 16px/1.3 var(--font-head); }
.arc-step span { display: block; color: var(--muted); font-size: 14px; line-height: 1.45; }
@media (max-width: 720px) { .arc li::after { display: none; } }

/* Sections */
.section { padding-top: 56px; }
h2 { font: 700 26px/1.2 var(--font-head); letter-spacing: -0.01em; margin: 0 0 18px; }
.section-head { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; }
.text-btn { background: none; border: 0; color: var(--accent); font: 500 14px var(--font-body); cursor: pointer; padding: 4px 0; }

/* Status pill (only shown when not "planned") */
.pill { display: inline-flex; align-items: center; gap: 6px; font: 600 11px/1 var(--font-mono); letter-spacing: 0.06em; text-transform: uppercase; padding: 5px 8px; border-radius: 999px; white-space: nowrap; }
.pill::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: currentColor; }
.pill[data-status="next"] { background: var(--accent-soft); color: var(--accent); }
.pill[data-status="active"] { background: var(--active-soft); color: var(--active); }
.pill[data-status="done"] { background: var(--done-soft); color: var(--done); }

/* Roadmap */
.roadmap { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 12px; }
.tile { display: flex; flex-direction: column; gap: 8px; height: 100%; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; color: var(--ink); text-decoration: none; transition: border-color 120ms ease; }
.tile:hover { border-color: var(--accent); }
.tile[data-status="next"], .tile[data-status="active"] { border-color: var(--accent); }
.tile-top { display: flex; justify-content: space-between; align-items: center; gap: 8px; min-height: 22px; }
.lvl { font: 600 12px/1 var(--font-mono); color: var(--accent); letter-spacing: 0.06em; }
.lvl span { color: var(--muted); font-weight: 500; }
.tile h3 { font: 700 16px/1.25 var(--font-head); margin: 0; }
.tile p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.5; }
.tile .tools { margin-top: auto; padding-top: 4px; }

/* Tool chips */
.tools { display: flex; flex-wrap: wrap; gap: 6px; list-style: none; padding: 0; margin: 0; }
.tools li { font: 500 12px/1 var(--font-mono); color: var(--muted); background: var(--surface-2); border-radius: 6px; padding: 5px 7px; }
.tools a { display: inline-flex; align-items: center; gap: 6px; color: var(--ink); text-decoration: none; font: 500 13px/1 var(--font-body); background: var(--surface-2); border-radius: 8px; padding: 6px 9px; }
.tools a:hover { color: var(--accent); }
.tools a img { width: 14px; height: 14px; border-radius: 3px; }
.tools li:has(a) { background: none; padding: 0; }

/* Module cards */
.module { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); margin-bottom: 10px; }
.module[open] { border-color: color-mix(in srgb, var(--accent) 45%, var(--line)); }
.module > summary { list-style: none; cursor: pointer; padding: 18px; display: grid; grid-template-columns: auto 1fr auto; gap: 2px 14px; align-items: center; }
.module > summary::-webkit-details-marker { display: none; }
.module > summary:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: var(--radius); }
.badge { grid-row: span 2; width: 40px; height: 40px; border-radius: 10px; display: grid; place-items: center; background: var(--accent-soft); color: var(--accent); font: 700 17px var(--font-head); }
.module-title { font: 700 18px/1.25 var(--font-head); margin: 0; }
.module-q { grid-column: 2; margin: 0; color: var(--muted); font-size: 14px; }
.module-side { grid-column: 3; grid-row: 1 / span 2; display: flex; align-items: center; gap: 12px; }
.module-months { color: var(--muted); font-size: 13px; white-space: nowrap; }
.chev { color: var(--muted); transition: transform 150ms ease; }
.module[open] .chev { transform: rotate(180deg); }
@media (max-width: 640px) {
  .module > summary { grid-template-columns: auto 1fr; }
  .module-side { grid-column: 2; grid-row: auto; }
  .chev { display: none; }
}

.module-body { padding: 0 18px 20px; }
.module-summary { margin: 0 0 20px; max-width: 72ch; }
.module-grid { display: grid; gap: 20px; }
@media (min-width: 860px) { .module-grid { grid-template-columns: 1fr 1fr; } }
.block + .block { margin-top: 20px; }
.block > h4 { font: 600 12px/1 var(--font-mono); letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); margin: 0 0 10px; }

.lab { background: var(--surface-2); border-radius: 10px; padding: 14px 16px; }
.lab h5 { font: 700 16px/1.3 var(--font-head); margin: 0 0 4px; }
.lab > p { margin: 0 0 8px; color: var(--muted); font-size: 14px; }
.lab ol { margin: 0; padding-left: 20px; }
.lab li { margin: 5px 0; font-size: 15px; }

.checks { list-style: none; padding: 0; margin: 0; }
.checks li { position: relative; padding-left: 24px; margin: 6px 0; font-size: 15px; }
.checks li::before { content: "✓"; position: absolute; left: 0; color: var(--done); font-weight: 700; }

.chips { display: flex; flex-wrap: wrap; gap: 6px; padding: 0; margin: 0; list-style: none; }
.chips li { font-size: 13px; border: 1px solid var(--line); border-radius: 999px; padding: 3px 10px; }

.resources-block { margin-top: 24px; }

/* Preview cards */
.pgrid { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 300px), 1fr)); gap: 10px; }
.pcard { display: grid; grid-template-columns: 112px 1fr; gap: 12px; align-items: start; padding: 10px; background: var(--surface); border: 1px solid var(--line); border-radius: 10px; color: var(--ink); text-decoration: none; min-width: 0; transition: border-color 120ms ease; }
.pcard:hover { border-color: var(--accent); }
.pcard[hidden] { display: none; }
.pcard { position: relative; }
.pcard:focus-within { border-color: var(--accent); }
.plink { color: inherit; text-decoration: none; }
.plink::after { content: ""; position: absolute; inset: 0; border-radius: inherit; }
.plink:focus-visible { outline: none; }
.ptop { display: flex; align-items: center; gap: 8px; }
.pbadge { font: 600 10px/1 var(--font-mono); letter-spacing: 0.06em; text-transform: uppercase; color: var(--accent); border: 1px solid currentColor; border-radius: 999px; padding: 2px 6px; }
.pcore { margin: 0 0 4px; font-size: 12px; color: var(--accent); }
.pcore strong { font-weight: 600; }
.pextra { position: relative; z-index: 1; display: flex; flex-wrap: wrap; gap: 10px; margin-top: 6px; font-size: 12px; }
.pextra a { color: var(--accent); text-decoration: none; }
.pextra a:hover, .pextra a:focus-visible { text-decoration: underline; }
.deeper { margin-top: 14px; }
.deeper > summary { cursor: pointer; font: 600 13px var(--font-body); color: var(--muted); padding: 6px 0; }
.deeper > summary:hover { color: var(--ink); }
.deeper > .pgrid { margin-top: 10px; }
.module .pcard { background: var(--bg); }
.pmedia { width: 112px; aspect-ratio: 16 / 10; border-radius: 6px; overflow: hidden; background: var(--surface-2); }
.pmedia img { width: 100%; height: 100%; object-fit: cover; display: block; }
.pfallback { width: 100%; height: 100%; display: flex; flex-direction: column; justify-content: space-between; padding: 7px 8px; background: var(--kind-soft, var(--surface-2)); color: var(--kind, var(--muted)); }
.pfallback strong { font: 600 10px/1 var(--font-mono); letter-spacing: 0.08em; text-transform: uppercase; }
.pfallback span { font: 500 10px/1.2 var(--font-mono); opacity: 0.85; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.pbody { min-width: 0; }
.pkind { font: 600 10px/1 var(--font-mono); letter-spacing: 0.08em; text-transform: uppercase; color: var(--kind, var(--muted)); }
.ptitle { font: 600 14px/1.35 var(--font-body); margin: 4px 0 3px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.pnote { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.45; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.psite { display: flex; align-items: center; gap: 6px; margin-top: 6px; color: var(--muted); font-size: 12px; min-width: 0; }
.psite img { width: 13px; height: 13px; border-radius: 3px; flex: none; }
.psite span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.pmods { margin-left: auto; font: 600 10px/1 var(--font-mono); color: var(--accent); white-space: nowrap; }
@media (max-width: 400px) { .pcard { grid-template-columns: 88px 1fr; } .pmedia { width: 88px; } }

[data-kind="paper"] { --kind: #b45309; --kind-soft: #fdecd3; }
[data-kind="book"] { --kind: #7c3aed; --kind-soft: #ede4fd; }
[data-kind="course"] { --kind: #0f766e; --kind-soft: #d5f2ee; }
[data-kind="video"] { --kind: #dc2626; --kind-soft: #fde2e2; }
[data-kind="blog"] { --kind: #2563eb; --kind-soft: #dfe9fd; }
[data-kind="podcast"] { --kind: #c026d3; --kind-soft: #f8e1fb; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) [data-kind] { --kind-soft: color-mix(in srgb, var(--kind) 22%, #151b23); --kind: color-mix(in srgb, var(--kind) 55%, white); }
}
:root[data-theme="dark"] [data-kind] { --kind-soft: color-mix(in srgb, var(--kind) 22%, #151b23); --kind: color-mix(in srgb, var(--kind) 55%, white); }

/* Library filters */
.filters { display: flex; flex-wrap: wrap; gap: 6px; margin: 0 0 16px; }
.filters button { border: 1px solid var(--line); background: transparent; color: var(--muted); font: 500 13px var(--font-body); padding: 6px 12px; border-radius: 999px; cursor: pointer; }
.filters button:hover { color: var(--ink); }
.filters button[aria-pressed="true"] { background: var(--ink); border-color: var(--ink); color: var(--bg); }
.filters small { opacity: 0.7; margin-left: 4px; }
.filters .core-toggle { margin-left: auto; }
.filters .core-toggle[aria-pressed="true"] { background: var(--accent); border-color: var(--accent); color: var(--bg); }

.footer { padding-top: 48px; padding-bottom: 48px; color: var(--muted); font-size: 14px; }
.error { color: #b91c1c; }