/* Revision — monochrome desk. Colour is reserved for marks:
   green got it, amber partly, red not yet. Everything else is ink and paper. */

:root {
  --bg: #fcfcfc; --side: #f5f5f6; --raise: #ffffff; --sunk: #f1f1f3;
  --rule: #e5e6e9; --rule-strong: #cfd1d6;
  --ink: #16171a; --ink-2: #4a4d55; --muted: #80848d;
  --inv: #16171a; --inv-ink: #ffffff;
  --got: #1f8a4c; --part: #b9770e; --miss: #cc3a2f;
  --got-soft: #e3f3e9; --part-soft: #f8eedb; --miss-soft: #fbe5e3;
  --heat-1: #d9dbe0; --heat-2: #a9adb6; --heat-3: #6b7079; --heat-4: #16171a;
  --ring: 0 0 0 2px var(--bg), 0 0 0 4px var(--ink);
  --sans: Geist, ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "Geist Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #141518; --side: #18191d; --raise: #1d1f23; --sunk: #111215; --rule: #2a2c31; --rule-strong: #3b3e45;
    --ink: #e8e9ec; --ink-2: #b4b7be; --muted: #7d818a; --inv: #e8e9ec; --inv-ink: #141518;
    --got: #46c17a; --part: #e0a13c; --miss: #ef6b5f; --got-soft: #16291e; --part-soft: #2b2416; --miss-soft: #2e1a18;
    --heat-1: #2c2f35; --heat-2: #4c5059; --heat-3: #8a8f99; --heat-4: #e8e9ec;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #141518; --side: #18191d; --raise: #1d1f23; --sunk: #111215; --rule: #2a2c31; --rule-strong: #3b3e45;
  --ink: #e8e9ec; --ink-2: #b4b7be; --muted: #7d818a; --inv: #e8e9ec; --inv-ink: #141518;
  --got: #46c17a; --part: #e0a13c; --miss: #ef6b5f; --got-soft: #16291e; --part-soft: #2b2416; --miss-soft: #2e1a18;
  --heat-1: #2c2f35; --heat-2: #4c5059; --heat-3: #8a8f99; --heat-4: #e8e9ec;
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 15px/1.55 var(--sans); -webkit-font-smoothing: antialiased; }
a { color: inherit; }
button, input, select, textarea { font: inherit; color: inherit; }
h1, h2, h3, p { margin: 0; }
h1 { font-size: 26px; line-height: 1.2; font-weight: 600; letter-spacing: -0.015em; }
h2 { font-size: 17px; line-height: 1.3; font-weight: 600; }
h3 { font-size: 14px; font-weight: 600; }
:focus-visible { outline: none; box-shadow: var(--ring); border-radius: 4px; }
[hidden] { display: none !important; }
kbd, .mono { font-family: var(--mono); font-size: 12px; }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 12px; top: 12px; background: var(--raise); padding: 6px 10px; z-index: 9; }
.muted { color: var(--muted); }
.small { font-size: 13px; }
.row { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.spacer { flex: 1; }

/* ---------- shell ---------- */
.shell { display: grid; grid-template-columns: 236px minmax(0, 1fr); min-height: 100vh; }
.sidebar {
  position: sticky; top: 0; height: 100vh; overflow-y: auto; display: flex; flex-direction: column; gap: 20px;
  padding: 20px 14px; background: var(--side); border-right: 1px solid var(--rule);
}
.wordmark { font-family: var(--mono); font-weight: 500; font-size: 15px; text-decoration: none; padding: 2px 8px; }
.wordmark::after { content: "_"; color: var(--muted); animation: caret 1.1s steps(1) 3; }
@keyframes caret { 50% { opacity: 0; } }
.subjects { display: grid; gap: 1px; }
.subjects button {
  display: flex; justify-content: space-between; align-items: baseline; gap: 8px; width: 100%;
  border: 0; background: none; padding: 6px 8px; border-radius: 6px; cursor: pointer; text-align: left; color: var(--ink-2); font-size: 14px;
}
.subjects button span { font-size: 12px; color: var(--ink-2); white-space: nowrap; }
.subjects button:hover { background: var(--raise); }
.subjects button[aria-checked="true"] { color: var(--ink); background: var(--raise); box-shadow: inset 0 0 0 1px var(--rule); font-weight: 500; }
.nav { display: grid; gap: 1px; padding-top: 14px; border-top: 1px solid var(--rule); }
.nav a, .side-foot > a, .side-foot > button {
  display: flex; justify-content: space-between; align-items: center; gap: 8px; width: 100%;
  padding: 6px 8px; border: 0; border-radius: 6px; background: none; color: var(--ink-2);
  text-decoration: none; font-size: 14px; text-align: left; cursor: pointer;
}
.nav a .count { font-family: var(--mono); font-size: 11px; color: var(--muted); }
.nav a:hover, .side-foot > a:hover, .side-foot > button:hover { color: var(--ink); background: var(--raise); }
.nav a.on, .side-foot > a.on { color: var(--ink); background: var(--raise); box-shadow: inset 0 0 0 1px var(--rule); font-weight: 500; }
.side-foot { margin-top: auto; display: grid; gap: 1px; }
.side-foot > a, .side-foot > button { font-size: 13px; color: var(--muted); }
.account-line { display: grid !important; gap: 0; margin-bottom: 6px; padding: 8px !important; border: 1px solid var(--rule) !important; }
.account-line strong { font-weight: 500; color: var(--ink); font-size: 13px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.account-line span { font-size: 12px; color: var(--muted); }
.sync-dot { display: inline-block; width: 6px; height: 6px; border-radius: 50%; background: var(--muted); margin-right: 6px; vertical-align: 1px; }
.sync-dot.synced { background: var(--got); }
.sync-dot.syncing { background: var(--part); }
.sync-dot.error { background: var(--miss); }
.sources { margin: 10px 8px 0; padding-top: 12px; border-top: 1px solid var(--rule); font-size: 12px; line-height: 1.5; color: var(--muted); }
.sources a { color: var(--ink-2); }
.main { min-width: 0; outline: none; }
.tabbar { display: none; }

/* ---------- pages ---------- */
.page { max-width: 900px; margin: 0 auto; padding: 44px 40px 96px; }
.page-head { margin-bottom: 26px; display: flex; justify-content: space-between; align-items: flex-end; gap: 16px; flex-wrap: wrap; }
.page-head p { color: var(--ink-2); margin-top: 6px; max-width: 62ch; }
.section { margin-top: 36px; }
.section > h2, .section-head { margin-bottom: 10px; }
.section-head { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; }
.section-head a { font-size: 13px; color: var(--muted); }
.empty { padding: 18px 0; color: var(--ink-2); max-width: 58ch; }
.loading { padding: 60px 40px; color: var(--muted); }
.notice { padding: 12px 14px; border: 1px solid var(--rule); border-radius: 8px; color: var(--ink-2); font-size: 14px; background: var(--raise); }

/* ---------- buttons & inputs ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 36px; padding: 6px 14px; border-radius: 6px;
  border: 1px solid var(--rule-strong); background: var(--raise); color: var(--ink); font-size: 14px; font-weight: 500;
  cursor: pointer; text-decoration: none; white-space: nowrap;
}
.btn:hover { border-color: var(--ink-2); }
.btn.primary { background: var(--inv); border-color: var(--inv); color: var(--inv-ink); }
.btn.primary:hover { opacity: .9; }
.btn.quiet { border-color: transparent; background: none; color: var(--ink-2); }
.btn.quiet:hover { color: var(--ink); background: var(--sunk); }
.btn.small { min-height: 30px; padding: 4px 10px; font-size: 13px; }
.btn kbd { opacity: .6; }
.btn[disabled] { opacity: .5; cursor: default; }
.link { background: none; border: 0; padding: 0; color: var(--ink-2); text-decoration: underline; cursor: pointer; font-size: inherit; }
input[type="text"], input[type="email"], input[type="password"], input[type="url"], input[type="date"], input[type="search"], select, textarea {
  width: 100%; padding: 8px 11px; border: 1px solid var(--rule-strong); border-radius: 6px; background: var(--raise); font-size: 14px;
}
textarea { resize: vertical; line-height: 1.5; }
.form { display: grid; gap: 16px; max-width: 560px; }
.form label { display: grid; gap: 6px; font-size: 14px; font-weight: 500; }
.form .lab span { font-weight: 400; color: var(--muted); font-size: 13px; margin-left: 4px; }
.form textarea { min-height: 140px; }
.error { color: var(--miss); font-size: 13px; }
.trap { position: absolute; left: -9999px; }
.chips { display: flex; gap: 6px; flex-wrap: wrap; }
.chip {
  display: inline-flex; align-items: center; gap: 6px; padding: 5px 10px; border: 1px solid var(--rule); border-radius: 6px;
  background: var(--raise); cursor: pointer; font-size: 13px; color: var(--ink-2);
}
.chip:hover { border-color: var(--rule-strong); color: var(--ink); }
.chip[aria-pressed="true"], .chip:has(input:checked) { border-color: var(--ink); color: var(--ink); }
.chip input { margin: 0; accent-color: var(--ink); }
.chip kbd { color: var(--muted); }

/* ---------- lists ---------- */
.list { border-top: 1px solid var(--rule); }
.list-row {
  display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 14px; align-items: center;
  padding: 11px 6px; border-bottom: 1px solid var(--rule); text-decoration: none;
}
a.list-row:hover, button.list-row:hover { background: var(--raise); }
button.list-row { width: 100%; border-width: 0 0 1px; background: none; text-align: left; cursor: pointer; }
.list-row .what { min-width: 0; }
.list-row .what > span { display: block; font-size: 13px; color: var(--muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.list-row .end { display: flex; gap: 8px; align-items: center; font-family: var(--mono); font-size: 12px; color: var(--muted); white-space: nowrap; }
.tag { font-family: var(--mono); font-size: 11px; padding: 1px 6px; border-radius: 4px; border: 1px solid var(--rule); color: var(--muted); }
.res { font-family: var(--sans); font-size: 12px; font-weight: 500; padding: 1px 8px; border-radius: 4px; }
.res.got { background: var(--got-soft); color: var(--got); }
.res.partly { background: var(--part-soft); color: var(--part); }
.res.not { background: var(--miss-soft); color: var(--miss); }
.more-row { padding: 14px 0; }

/* ---------- today ---------- */
.next {
  display: flex; justify-content: space-between; align-items: center; gap: 20px; flex-wrap: wrap;
  padding: 20px 22px; border: 1px solid var(--rule); border-radius: 10px; background: var(--raise);
}
.next p { color: var(--ink-2); margin-top: 2px; }
.focus-add { display: flex; gap: 8px; margin-top: 10px; }
.focus-item { display: flex; align-items: flex-start; gap: 10px; padding: 9px 4px; border-bottom: 1px solid var(--rule); }
.focus-item input { margin-top: 4px; accent-color: var(--ink); }
.focus-item.done span { color: var(--muted); text-decoration: line-through; }
.focus-item .spacer + button { opacity: 0; }
.focus-item:hover .spacer + button { opacity: 1; }
.heat { display: grid; grid-auto-flow: column; grid-template-rows: repeat(7, 11px); grid-auto-columns: 11px; justify-content: start; gap: 3px; overflow-x: auto; padding-bottom: 4px; }
.heat i { width: 11px; height: 11px; border-radius: 2px; background: var(--sunk); box-shadow: inset 0 0 0 1px var(--rule); }
.heat i.h1 { background: var(--heat-1); box-shadow: none; }
.heat i.h2 { background: var(--heat-2); box-shadow: none; }
.heat i.h3 { background: var(--heat-3); box-shadow: none; }
.heat i.h4 { background: var(--heat-4); box-shadow: none; }
.bar { display: inline-block; width: 70px; height: 6px; border-radius: 3px; background: var(--sunk); overflow: hidden; vertical-align: middle; }
.bar i { display: block; height: 100%; background: var(--ink-2); }

/* ---------- practise builder ---------- */
.group { border-top: 1px solid var(--rule); padding: 12px 0; }
.group-head { display: flex; justify-content: space-between; gap: 12px; align-items: baseline; margin-bottom: 8px; }
.group-head p { font-size: 13px; color: var(--muted); }
.modes { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 8px; }
.mode { display: grid; gap: 2px; padding: 10px 12px; border: 1px solid var(--rule); border-radius: 8px; background: var(--raise); cursor: pointer; text-align: left; }
.mode span { font-size: 13px; color: var(--muted); }
.mode[aria-pressed="true"] { border-color: var(--ink); }
.startbar {
  position: sticky; bottom: 0; display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap;
  margin-top: 28px; padding: 14px 0 calc(14px + env(safe-area-inset-bottom)); background: var(--bg); border-top: 1px solid var(--rule);
}
.filters { display: grid; gap: 8px; margin-bottom: 18px; }
.filters .search { height: 42px; font-size: 15px; padding: 0 14px; }
.filters .selects { display: flex; gap: 8px; flex-wrap: wrap; }
.filters .selects select { width: auto; min-width: 0; flex: 0 1 auto; }
select {
  appearance: none; -webkit-appearance: none; height: 34px; padding: 0 30px 0 11px; cursor: pointer; color: var(--ink-2);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'%3E%3Cpath d='M1 1l4 4 4-4' fill='none' stroke='%2380848d' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 11px center;
}
select:hover { border-color: var(--ink-2); color: var(--ink); }
.results-head { display: flex; justify-content: space-between; align-items: center; gap: 12px; padding-bottom: 10px; }
details.more summary { cursor: pointer; color: var(--ink-2); font-size: 14px; margin-top: 18px; }
details.more[open] summary { margin-bottom: 12px; }

/* ---------- practice ---------- */
.practice { max-width: 940px; margin: 0 auto; padding: 22px 32px 150px; }
.p-top { display: flex; justify-content: space-between; align-items: center; gap: 16px; margin-bottom: 12px; flex-wrap: wrap; }
.p-top > a { color: var(--muted); text-decoration: none; font-size: 14px; }
.p-top > a:hover { color: var(--ink); }
.strip { display: flex; gap: 4px; flex-wrap: wrap; max-width: 560px; justify-content: flex-end; }
.strip a {
  width: 22px; height: 22px; display: grid; place-items: center; border-radius: 4px; border: 1px solid var(--rule-strong);
  font: 500 10px/1 var(--mono); color: var(--muted); text-decoration: none;
}
.strip a.cur { border-color: var(--ink); color: var(--ink); }
.strip a.got { background: var(--got); border-color: var(--got); color: #fff; }
.strip a.partly { background: var(--part); border-color: var(--part); color: #fff; }
.strip a.not { background: var(--miss); border-color: var(--miss); color: #fff; }
.q-head { display: flex; justify-content: space-between; align-items: baseline; gap: 16px; margin: 14px 0 2px; flex-wrap: wrap; }
.q-head h1 { font-size: 20px; }
.q-head .mono { color: var(--muted); }
.q-sub { color: var(--muted); font-size: 14px; margin-bottom: 14px; }
.sheet { background: #fff; border: 1px solid var(--rule); border-radius: 10px; padding: 14px; min-height: 96px; }
.sheet canvas { display: block; width: 100%; height: auto; }
.sheet canvas + canvas { margin-top: 8px; }
.sheet-state { color: #6b6f78; text-align: center; padding: 28px 12px; font-size: 14px; }
.sheet-state a { color: #16171a; }
.away {
  display: flex; justify-content: space-between; align-items: center; gap: 16px; flex-wrap: wrap;
  padding: 18px 20px; border: 1px dashed var(--rule-strong); border-radius: 10px;
}
.away p { color: var(--ink-2); max-width: 54ch; }
.panel { margin-top: 18px; }
.panel-label { display: flex; justify-content: space-between; gap: 12px; align-items: baseline; margin-bottom: 8px; font-size: 13px; color: var(--muted); }
.panel textarea { min-height: 120px; font-family: var(--mono); font-size: 13px; }
.q-tools { display: flex; gap: 4px; flex-wrap: wrap; margin-top: 12px; align-items: center; }
.q-tools .credit { margin-left: auto; font-size: 13px; color: var(--muted); }
.q-tools .credit a { color: var(--ink-2); }
.similar { margin-top: 24px; }
.markbar {
  position: fixed; left: 236px; right: 0; bottom: 0; z-index: 4; display: flex; justify-content: center; gap: 8px; flex-wrap: wrap;
  padding: 12px 16px calc(12px + env(safe-area-inset-bottom)); background: color-mix(in srgb, var(--bg) 94%, transparent);
  border-top: 1px solid var(--rule); backdrop-filter: blur(6px);
}
.markbar .btn { min-width: 118px; }
.markbar .m-got:hover, .markbar .m-got.chosen { border-color: var(--got); color: var(--got); }
.markbar .m-partly:hover, .markbar .m-partly.chosen { border-color: var(--part); color: var(--part); }
.markbar .m-not:hover, .markbar .m-not.chosen { border-color: var(--miss); color: var(--miss); }
.why { display: grid; gap: 10px; justify-items: center; width: 100%; }
.why p { font-size: 14px; color: var(--ink-2); }
.done-card { text-align: center; padding: 60px 20px; display: grid; gap: 14px; justify-items: center; }
.done-card .score { font-family: var(--mono); font-size: 40px; font-weight: 500; letter-spacing: -0.02em; }

/* ---------- progress ---------- */
.prog-row { display: grid; grid-template-columns: minmax(0, 1fr) auto 64px 74px; gap: 14px; align-items: center; padding: 8px 4px; border-bottom: 1px solid var(--rule); font-size: 14px; }
.prog-row .mono { color: var(--muted); text-align: right; }
.conf { display: inline-flex; border: 1px solid var(--rule); border-radius: 6px; overflow: hidden; }
.conf button { border: 0; background: none; padding: 3px 9px; font-size: 12px; color: var(--muted); cursor: pointer; }
.conf button + button { border-left: 1px solid var(--rule); }
.conf button[aria-pressed="true"][data-level="not"] { background: var(--miss-soft); color: var(--miss); }
.conf button[aria-pressed="true"][data-level="unsure"] { background: var(--part-soft); color: var(--part); }
.conf button[aria-pressed="true"][data-level="confident"] { background: var(--got-soft); color: var(--got); }

.toast {
  position: fixed; left: 50%; bottom: 88px; transform: translateX(-50%); z-index: 9; padding: 8px 14px; border-radius: 6px;
  background: var(--inv); color: var(--inv-ink); font-size: 14px; opacity: 0; pointer-events: none; transition: opacity .15s;
}
.toast.show { opacity: 1; }

@media (max-width: 860px) {
  .shell { grid-template-columns: minmax(0, 1fr); }
  .sidebar { display: none; }
  .page { padding: 24px 16px 120px; }
  .practice { padding: 14px 16px 210px; }
  .markbar { left: 0; bottom: 57px; }
  .markbar .btn { min-width: 0; flex: 1; padding: 6px 8px; }
  .markbar [data-action="reveal"] { flex-basis: 100%; }
  .markbar kbd { display: none; }
  .filters .selects select { flex: 1 1 calc(50% - 4px); }
  .prog-row { grid-template-columns: minmax(0, 1fr) auto; }
  .prog-row .mono { display: none; }
  .startbar { bottom: 57px; }
  .mobile-subject { display: block !important; margin-bottom: 18px; }
  .tabbar {
    display: grid; grid-template-columns: repeat(5, 1fr); position: fixed; left: 0; right: 0; bottom: 0; z-index: 5;
    background: var(--side); border-top: 1px solid var(--rule); padding-bottom: env(safe-area-inset-bottom);
  }
  .tabbar a { text-align: center; padding: 17px 4px; font-size: 13px; color: var(--muted); text-decoration: none; }
  .tabbar a.on { color: var(--ink); font-weight: 500; }
  .toast { bottom: 140px; }
}
.mobile-subject { display: none; }
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}