/* ---------- tokens ---------- */
:root {
  --bg: #0e1116;
  --bg-2: #151a21;
  --bg-3: #1b222b;
  --fg: #e6edf3;
  --fg-dim: #9aa7b4;
  --line: #2a323d;
  --accent: #57a6ff;
  --accent-soft: rgba(87, 166, 255, 0.14);
  --ok: #4ec9a0;
  --warn: #e3b341;
  --bad: #f2726f;
  --code-bg: #11161c;
  --radius: 10px;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color-scheme: dark;
}
:root[data-theme="light"] {
  --bg: #ffffff;
  --bg-2: #f6f8fa;
  --bg-3: #eef1f5;
  --fg: #1c2128;
  --fg-dim: #57606a;
  --line: #d8dee4;
  --accent: #0b62d6;
  --accent-soft: rgba(11, 98, 214, 0.1);
  --ok: #0f7b5f;
  --warn: #9a6700;
  --bad: #c0362c;
  --code-bg: #f3f5f8;
  color-scheme: light;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.65 var(--sans);
  -webkit-text-size-adjust: 100%;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.skip { position: absolute; left: -9999px; }
.skip:focus { left: 8px; top: 8px; background: var(--accent); color: #fff; padding: 8px 12px; z-index: 20; border-radius: 6px; }

/* ---------- chrome ---------- */
.topbar {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; gap: 12px;
  padding: 10px 16px;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.brand { font-weight: 650; letter-spacing: -0.01em; color: var(--fg); }
.nav-toggle, .theme-toggle {
  margin-left: auto; background: var(--bg-2); color: var(--fg);
  border: 1px solid var(--line); border-radius: 8px; padding: 6px 10px;
  font: inherit; font-size: 13px; cursor: pointer;
}
.theme-toggle { margin-left: 0; min-width: 38px; }
.nav-toggle { display: none; }

.shell { display: grid; grid-template-columns: 250px minmax(0, 1fr); gap: 32px; max-width: 1180px; margin: 0 auto; padding: 24px 16px 64px; }
.sidenav { position: sticky; top: 64px; align-self: start; max-height: calc(100vh - 80px); overflow-y: auto; font-size: 14px; }
.sidenav ul { list-style: none; margin: 0 0 18px; padding: 0; }
.sidenav li { margin: 1px 0; }
.sidenav a { display: flex; align-items: center; gap: 6px; padding: 5px 9px; border-radius: 7px; color: var(--fg-dim); }
.sidenav a:hover { background: var(--bg-2); color: var(--fg); text-decoration: none; }
.sidenav a[aria-current="page"] { background: var(--accent-soft); color: var(--accent); }
.nav-h { font-size: 11px; text-transform: uppercase; letter-spacing: 0.09em; color: var(--fg-dim); margin: 14px 0 6px 9px; opacity: 0.75; }
.pill { margin-left: auto; font-size: 11px; color: var(--fg-dim); background: var(--bg-3); border-radius: 20px; padding: 1px 7px; }
.foot { border-top: 1px solid var(--line); padding: 20px 16px 40px; color: var(--fg-dim); font-size: 13px; }
.foot p { max-width: 1180px; margin: 0 auto; }

/* ---------- prose ---------- */
.content { min-width: 0; }
.prose { max-width: 76ch; }
.prose h1 { font-size: clamp(1.7rem, 1.3rem + 1.6vw, 2.3rem); line-height: 1.15; letter-spacing: -0.02em; margin: 0 0 18px; }
.prose h2 { font-size: 1.3rem; margin: 44px 0 12px; padding-top: 14px; border-top: 1px solid var(--line); letter-spacing: -0.01em; }
.prose h3 { font-size: 1.06rem; margin: 28px 0 8px; }
.prose h2 a, .prose h3 a, .prose h1 a { color: inherit; }
.prose p, .prose li { overflow-wrap: break-word; }
.prose ul, .prose ol { padding-left: 1.3em; }
.prose li { margin: 4px 0; }
.prose hr { border: 0; border-top: 1px solid var(--line); margin: 34px 0 0; }
.prose hr + h2 { border-top: 0; padding-top: 0; margin-top: 26px; }
.prose blockquote { margin: 18px 0; padding: 2px 16px; border-left: 3px solid var(--line); color: var(--fg-dim); }
.prose em { color: var(--fg-dim); font-style: italic; }

code { font-family: var(--mono); font-size: 0.88em; background: var(--bg-3); padding: 0.12em 0.4em; border-radius: 5px; }
pre { background: var(--code-bg); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px; overflow-x: auto; margin: 14px 0; }
pre code { background: none; padding: 0; font-size: 13px; line-height: 1.6; }

.prose table { width: 100%; border-collapse: collapse; margin: 16px 0; font-size: 14.5px; display: block; overflow-x: auto; }
.prose th, .prose td { border-bottom: 1px solid var(--line); padding: 8px 12px; text-align: left; vertical-align: top; }
.prose th { color: var(--fg-dim); font-weight: 600; font-size: 12.5px; text-transform: uppercase; letter-spacing: 0.05em; }

.callout { background: var(--bg-2); border: 1px solid var(--line); border-left: 3px solid var(--accent); border-radius: var(--radius); padding: 2px 16px; margin: 18px 0; }
.callout.warn { border-left-color: var(--warn); }
.callout p:first-child { margin-top: 12px; }

/* ---------- domain header ---------- */
.domain-head { display: flex; gap: 16px; align-items: center; margin-bottom: 18px; }
.weight-badge {
  flex: none; width: 62px; height: 62px; border-radius: 50%;
  display: grid; place-items: center; font-weight: 680; font-size: 15px;
  background: conic-gradient(var(--accent) calc(var(--w) * 1%), var(--bg-3) 0);
  color: var(--fg);
  position: relative;
}
.weight-badge::before { content: ""; position: absolute; inset: 5px; border-radius: 50%; background: var(--bg); }
.weight-badge b { position: relative; z-index: 1; font-weight: 680; }
.eyebrow { font-size: 11px; text-transform: uppercase; letter-spacing: 0.1em; color: var(--fg-dim); margin: 0; }
.dsummary { margin: 2px 0 0; color: var(--fg-dim); font-size: 14.5px; }
.domain-actions { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin-bottom: 26px; }
.counts { font-size: 13px; color: var(--fg-dim); }

/* ---------- controls ---------- */
.btn {
  display: inline-block; background: var(--accent); color: #fff; border: 1px solid transparent;
  border-radius: 8px; padding: 8px 14px; font: inherit; font-size: 14px; font-weight: 550; cursor: pointer;
}
.btn:hover { text-decoration: none; filter: brightness(1.08); }
.btn.ghost { background: transparent; color: var(--fg); border-color: var(--line); }
.btn.ghost:hover { background: var(--bg-2); }
.btn:disabled { opacity: 0.45; cursor: not-allowed; }
select, input[type="date"], input[type="number"], textarea {
  background: var(--bg-2); color: var(--fg); border: 1px solid var(--line);
  border-radius: 8px; padding: 7px 10px; font: inherit; font-size: 14px;
}
kbd {
  font-family: var(--mono); font-size: 11px; background: var(--bg-3);
  border: 1px solid var(--line); border-bottom-width: 2px; border-radius: 5px; padding: 1px 5px; color: var(--fg-dim);
}
label { font-size: 14px; color: var(--fg-dim); }

/* ---------- cards / tools ---------- */
.card { background: var(--bg-2); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px 20px; margin: 16px 0; }
.grid { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); }
.toolbar { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin: 18px 0; }
.stat { background: var(--bg-2); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px; }
.stat b { display: block; font-size: 1.7rem; font-weight: 650; letter-spacing: -0.02em; line-height: 1.1; }
.stat span { font-size: 12px; color: var(--fg-dim); text-transform: uppercase; letter-spacing: 0.06em; }
.muted { color: var(--fg-dim); }
.small { font-size: 13px; }

.bar { height: 8px; background: var(--bg-3); border-radius: 20px; overflow: hidden; }
.bar > i { display: block; height: 100%; background: var(--accent); border-radius: 20px; }
.bar > i.risk { background: var(--warn); }
.bar > i.good { background: var(--ok); }

.review-card { min-height: 240px; display: flex; flex-direction: column; justify-content: center; }
.q { font-size: 1.15rem; font-weight: 560; margin: 0 0 8px; }
.a { border-top: 1px dashed var(--line); margin-top: 14px; padding-top: 14px; color: var(--fg); }
.grades { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.grades .btn { flex: 1 1 110px; }
.g0 { background: var(--bad); } .g3 { background: var(--warn); color: #1c2128; }
.g4 { background: var(--accent); } .g5 { background: var(--ok); color: #06231b; }
.progress-line { font-size: 13px; color: var(--fg-dim); display: flex; gap: 14px; flex-wrap: wrap; }

.cloze-blank {
  display: inline-block; min-width: 7ch; border-bottom: 2px solid var(--accent);
  background: var(--accent-soft); border-radius: 3px 3px 0 0; padding: 0 4px; text-align: center;
}
.cloze-blank.revealed { border-bottom-color: var(--ok); background: rgba(78, 201, 160, 0.16); color: var(--fg); }
pre.cloze { white-space: pre-wrap; word-break: break-word; }

.timer { font-family: var(--mono); font-size: 1.5rem; font-variant-numeric: tabular-nums; }
.timer.over { color: var(--bad); }
details { border: 1px solid var(--line); border-radius: var(--radius); padding: 10px 14px; margin: 10px 0; background: var(--bg-2); }
details > summary { cursor: pointer; font-weight: 550; }
details[open] > summary { margin-bottom: 8px; }
.step { border-left: 2px solid var(--line); padding: 4px 0 4px 14px; margin: 12px 0; }
.step pre { margin: 0 0 6px; }
.step .why { font-size: 13.5px; color: var(--fg-dim); }

.hero { border: 1px solid var(--line); background: linear-gradient(160deg, var(--bg-2), var(--bg)); border-radius: 14px; padding: 26px 24px; margin-bottom: 26px; }
.hero h1 { margin: 0 0 8px; font-size: clamp(1.8rem, 1.3rem + 2vw, 2.6rem); letter-spacing: -0.025em; }
.hero p { margin: 0 0 6px; color: var(--fg-dim); max-width: 62ch; }
.weights { display: flex; gap: 3px; margin: 20px 0 8px; height: 30px; border-radius: 7px; overflow: hidden; }
.weights a { flex-basis: 0; flex-shrink: 0; display: grid; place-items: center; font-size: 12px; font-weight: 600; color: var(--bg); background: var(--accent); opacity: 0.9; }
.weights a:hover { opacity: 1; text-decoration: none; }

/* ---------- responsive ---------- */
@media (max-width: 860px) {
  .shell { grid-template-columns: 1fr; gap: 0; padding-top: 12px; }
  .nav-toggle { display: block; }
  .sidenav { position: static; max-height: none; display: none; border-bottom: 1px solid var(--line); padding-bottom: 12px; margin-bottom: 18px; }
  .sidenav.open { display: block; }
  .prose { max-width: none; }
  body { font-size: 15.5px; }
  pre code { font-size: 12.5px; }
}
@media print {
  .topbar, .sidenav, .foot, .domain-actions { display: none; }
  .shell { display: block; }
}