@font-face {
  font-family: "IBM Plex Sans";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("fonts/sans-400.woff2") format("woff2");
}
@font-face {
  font-family: "IBM Plex Sans";
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url("fonts/sans-500.woff2") format("woff2");
}
@font-face {
  font-family: "IBM Plex Sans";
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url("fonts/sans-600.woff2") format("woff2");
}
@font-face {
  font-family: "IBM Plex Sans";
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url("fonts/sans-700.woff2") format("woff2");
}
@font-face {
  font-family: "IBM Plex Mono";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("fonts/mono-400.woff2") format("woff2");
}
@font-face {
  font-family: "IBM Plex Mono";
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url("fonts/mono-500.woff2") format("woff2");
}

:root {
  --navy: #0b1f3a;
  --azure: #0c6ec4;
  --azure-ink: #0a5a9c;
  --ink: #1a2332;
  --muted: #5a6573;
  --hair: #d5dce3;
  --wash: #f4f7fa;
  --paper: #fbfcfd;
  --ok: #1f7a45;
  --ok-bg: #e7f5ec;
  --warn: #9a6414;
  --warn-bg: #fff4e5;
  --exam-bg: #f3eee3;
  --doing: #0c6ec4;
  --skip: #8a6a2f;
  --danger: #9b2c2c;
  --shadow: 0 10px 30px rgb(11 31 58 / 8%);
  --radius: 3px;
  --rail: 272px;
  --sans: "IBM Plex Sans", "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, Menlo, monospace;
}

html[data-theme="dark"] {
  --navy: #d6e4f0;
  --azure: #5eb1f3;
  --azure-ink: #8ec8f6;
  --ink: #e6edf3;
  --muted: #93a0ae;
  --hair: #2a3848;
  --wash: #121c28;
  --paper: #0e1620;
  --ok: #6dce93;
  --ok-bg: #143024;
  --warn: #e0b15a;
  --warn-bg: #2e2414;
  --exam-bg: #2a2418;
  --doing: #5eb1f3;
  --skip: #c9a66b;
  --danger: #e07a7a;
  --shadow: 0 10px 30px rgb(0 0 0 / 35%);
}

*,
*::before,
*::after { box-sizing: border-box; }

html, body {
  margin: 0;
  min-height: 100dvh;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.5;
}

button, input, select, textarea {
  font: inherit;
  color: inherit;
}

a { color: var(--azure-ink); }
a:hover { text-decoration-thickness: 2px; }

.skip {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--navy);
  color: #fff;
  padding: 8px 12px;
  z-index: 20;
}
.skip:focus { left: 8px; top: 8px; }

.shell {
  display: grid;
  grid-template-columns: var(--rail) 1fr;
  min-height: 100dvh;
}

.rail {
  position: sticky;
  top: 0;
  height: 100dvh;
  overflow: auto;
  background: var(--navy);
  color: #d5e4f2;
  padding: 22px 16px 28px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

html[data-theme="dark"] .rail {
  background: #0a1420;
  border-right: 1px solid var(--hair);
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
  text-decoration: none;
  color: #fff;
}
.brand b {
  font-size: 22px;
  letter-spacing: -0.03em;
}
.brand span {
  font-size: 12px;
  color: #9bb3c7;
  font-weight: 500;
}

.meter {
  background: rgb(255 255 255 / 8%);
  border: 1px solid rgb(255 255 255 / 10%);
  padding: 12px;
}
.meter .row {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: #c5d4e0;
  margin-bottom: 8px;
}
.meter strong { color: #fff; font-variant-numeric: tabular-nums; }
.bar {
  height: 6px;
  background: rgb(255 255 255 / 12%);
  overflow: hidden;
}
.bar > i {
  display: block;
  height: 100%;
  background: var(--azure);
  width: 0;
}

.search {
  width: 100%;
  background: rgb(255 255 255 / 8%);
  border: 1px solid rgb(255 255 255 / 14%);
  color: #fff;
  padding: 8px 10px;
  border-radius: var(--radius);
}
.search::placeholder { color: #8fa6ba; }
.search:focus {
  outline: 2px solid var(--azure);
  outline-offset: 1px;
}

.nav {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.nav a {
  display: grid;
  grid-template-columns: 44px 1fr auto;
  gap: 8px;
  align-items: center;
  text-decoration: none;
  color: #c5d4e0;
  padding: 7px 8px;
  border-radius: var(--radius);
  font-size: 13px;
}
.nav a:hover, .nav a.is-on {
  background: rgb(255 255 255 / 10%);
  color: #fff;
}
.nav a em {
  font-style: normal;
  font-family: var(--mono);
  font-size: 11px;
  color: #8ec0ea;
}
.nav a small {
  font-variant-numeric: tabular-nums;
  color: #9bb3c7;
}

.rail-foot {
  margin-top: auto;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.rail-foot button,
.rail-foot a {
  background: transparent;
  border: 1px solid rgb(255 255 255 / 16%);
  color: #d5e4f2;
  text-align: left;
  padding: 7px 10px;
  border-radius: var(--radius);
  text-decoration: none;
  cursor: pointer;
}
.rail-foot button:hover,
.rail-foot a:hover { background: rgb(255 255 255 / 8%); }

.main {
  min-width: 0;
  padding: 28px 36px 72px;
}

.top {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 16px;
  margin-bottom: 22px;
  flex-wrap: wrap;
}
.kicker {
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--azure-ink);
  font-weight: 700;
  margin: 0 0 4px;
}
h1 {
  margin: 0;
  font-size: 28px;
  letter-spacing: -0.03em;
  line-height: 1.15;
  color: var(--navy);
  font-weight: 700;
}
.lede {
  max-width: 68ch;
  color: var(--muted);
  margin: 8px 0 0;
}
.lede p { margin: 0 0 0.7em; }
.lede p:last-child { margin-bottom: 0; }

.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 16px;
}
.chip {
  border: 1px solid var(--hair);
  background: var(--paper);
  padding: 5px 10px;
  border-radius: 999px;
  font-size: 12px;
  cursor: pointer;
  color: var(--muted);
}
.chip.is-on {
  border-color: var(--navy);
  color: var(--navy);
  background: var(--wash);
  font-weight: 600;
}
html[data-theme="dark"] .chip.is-on {
  color: var(--ink);
  border-color: var(--azure);
}

.grid-home {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 18px;
}
@media (max-width: 980px) {
  .shell { grid-template-columns: 1fr; }
  .rail {
    position: relative;
    height: auto;
    overflow: visible;
  }
  .grid-home { grid-template-columns: 1fr; }
  .main { padding: 20px 16px 64px; }
}

.panel {
  border: 1px solid var(--hair);
  background: var(--paper);
  padding: 16px 16px 12px;
}
.panel h2 {
  margin: 0 0 12px;
  font-size: 14px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 700;
}

.dom-row {
  display: grid;
  grid-template-columns: 48px 1fr 72px;
  gap: 10px;
  align-items: center;
  padding: 10px 0;
  border-top: 1px solid var(--hair);
  text-decoration: none;
  color: inherit;
}
.dom-row:first-of-type { border-top: 0; }
.dom-row em {
  font-family: var(--mono);
  font-style: normal;
  font-size: 12px;
  color: var(--azure-ink);
  font-weight: 500;
}
.dom-row strong { display: block; font-size: 14px; }
.dom-row span { color: var(--muted); font-size: 12px; }
.mini {
  height: 5px;
  background: var(--wash);
  margin-top: 6px;
  overflow: hidden;
}
.mini > i { display: block; height: 100%; background: var(--azure); }

.cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--azure);
  color: #fff;
  text-decoration: none;
  padding: 10px 14px;
  border-radius: var(--radius);
  font-weight: 600;
  border: 0;
  cursor: pointer;
}
.cta:hover { filter: brightness(1.05); }
.cta:active { transform: translateY(1px); }
.cta.ghost {
  background: transparent;
  color: var(--navy);
  border: 1px solid var(--hair);
}
html[data-theme="dark"] .cta.ghost { color: var(--ink); }

.lab-list { display: flex; flex-direction: column; }
.lab-item {
  display: grid;
  grid-template-columns: 28px 56px 1fr auto;
  gap: 10px;
  align-items: start;
  padding: 11px 4px;
  border-bottom: 1px solid var(--hair);
  text-decoration: none;
  color: inherit;
}
.lab-item:hover { background: var(--wash); }
.lab-item.is-done .lab-title { color: var(--muted); }
.num {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--azure-ink);
  font-weight: 500;
  padding-top: 2px;
}
.lab-title { font-weight: 600; }
.lab-meta {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  color: var(--muted);
  font-size: 12px;
  margin-top: 2px;
}
.dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: 2px solid var(--hair);
  margin-top: 4px;
  background: transparent;
}
.dot.todo { border-color: var(--hair); }
.dot.doing { border-color: var(--doing); background: var(--doing); }
.dot.done { border-color: var(--ok); background: var(--ok); }
.dot.skipped { border-color: var(--skip); background: var(--skip); }

.lab-head {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: flex-start;
  flex-wrap: wrap;
}
.pills { display: flex; gap: 6px; flex-wrap: wrap; }
.pill {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border: 1px solid var(--hair);
  padding: 3px 8px;
  background: var(--wash);
}
.pill.free { background: var(--ok-bg); color: var(--ok); border-color: transparent; }
.pill.low { background: #e8f3fc; color: var(--azure-ink); border-color: transparent; }
.pill.moderate { background: var(--warn-bg); color: var(--warn); border-color: transparent; }
html[data-theme="dark"] .pill.low { background: #163044; }

.actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin: 14px 0 6px;
}
.btn {
  border: 1px solid var(--hair);
  background: var(--paper);
  padding: 8px 12px;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
}
.btn:hover { background: var(--wash); }
.btn:active { transform: translateY(1px); }
.btn.is-on.done { background: var(--ok-bg); border-color: var(--ok); color: var(--ok); }
.btn.is-on.doing { background: #e8f3fc; border-color: var(--azure); color: var(--azure-ink); }
.btn.is-on.skipped { background: var(--warn-bg); border-color: var(--skip); color: var(--skip); }
.btn.is-on.todo { background: var(--wash); }

.block { margin: 18px 0; }
.block h2 {
  margin: 0 0 6px;
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--navy);
  font-weight: 700;
}
html[data-theme="dark"] .block h2 { color: var(--azure); }

.block p, .block li { max-width: 72ch; }
.steps {
  margin: 0;
  padding: 0 0 0 1.2em;
}
.steps li { margin: 0 0 8px; }

.callout {
  border-left: 3px solid var(--azure);
  background: #e8f3fc;
  padding: 10px 12px;
  margin: 12px 0;
}
.callout.ok { border-color: var(--ok); background: var(--ok-bg); }
.callout.exam { border-color: var(--skip); background: var(--exam-bg); }
.callout.warn { border-color: var(--warn); background: var(--warn-bg); }
.callout .lbl {
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.08em;
  margin-bottom: 4px;
}

code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: var(--wash);
  padding: 0.08em 0.32em;
  border-radius: 2px;
}
pre {
  background: var(--navy);
  color: #e8f0f7;
  padding: 12px 14px;
  overflow: auto;
  font-size: 12.5px;
  line-height: 1.45;
  margin: 10px 0;
}
pre code { background: none; color: inherit; padding: 0; }
html[data-theme="dark"] pre { background: #071018; border: 1px solid var(--hair); }

.notes {
  width: 100%;
  min-height: 90px;
  border: 1px solid var(--hair);
  background: var(--paper);
  padding: 10px;
  resize: vertical;
}
.notes:focus { outline: 2px solid var(--azure); outline-offset: 1px; }

.pager {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-top: 28px;
  padding-top: 16px;
  border-top: 1px solid var(--hair);
}
.pager a { font-weight: 600; text-decoration: none; max-width: 45%; }
.pager a span { display: block; color: var(--muted); font-size: 12px; font-weight: 500; }

.chooser {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}
.chooser th, .chooser td {
  text-align: left;
  vertical-align: top;
  padding: 9px 10px;
  border-bottom: 1px solid var(--hair);
}
.chooser th {
  background: var(--navy);
  color: #fff;
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
html[data-theme="dark"] .chooser th {
  background: #132233;
  color: var(--ink);
}
.chooser td:first-child { font-weight: 600; width: 42%; }

.keys {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 6px 12px;
  font-size: 14px;
}
kbd {
  font-family: var(--mono);
  font-size: 12px;
  border: 1px solid var(--hair);
  background: var(--wash);
  padding: 1px 6px;
  border-radius: 3px;
}

.help {
  position: fixed;
  inset: 0;
  background: rgb(11 31 58 / 45%);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 24px;
  z-index: 10;
}
.help.is-open { display: flex; }
.help-card {
  background: var(--paper);
  max-width: 480px;
  width: 100%;
  padding: 20px;
  border: 1px solid var(--hair);
  box-shadow: var(--shadow);
}
.toast {
  position: fixed;
  bottom: 18px;
  right: 18px;
  background: var(--navy);
  color: #fff;
  padding: 10px 14px;
  font-size: 13px;
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s;
  z-index: 12;
}
.toast.show { opacity: 1; }

.empty {
  padding: 28px 8px;
  color: var(--muted);
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}