:root {
  --bg: #f7f6f3;
  --surface: #ffffff;
  --surface-2: #f0efea;
  --ink: #1b1b19;
  --ink-2: #5c5b55;
  --ink-3: #8b8a82;
  --line: #e0ded7;
  --accent: #14532d;
  --accent-ink: #ffffff;
  --accent-soft: #e3efe7;
  --good: #1a7f4b;
  --good-soft: #e4f4ea;
  --bad: #b03030;
  --bad-soft: #fbeaea;
  --warn-soft: #fdf4e3;
  --radius: 12px;
  --shadow: 0 1px 2px rgba(0,0,0,.05), 0 4px 16px rgba(0,0,0,.04);
  --mono: "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #15161a;
    --surface: #1e2026;
    --surface-2: #272a31;
    --ink: #eceae4;
    --ink-2: #a9a79f;
    --ink-3: #7b7a73;
    --line: #333740;
    --accent: #4ba06c;
    --accent-ink: #0d1f15;
    --accent-soft: #1d3327;
    --good: #5bbd83;
    --good-soft: #17301f;
    --bad: #e07a7a;
    --bad-soft: #341d1d;
    --warn-soft: #302819;
    --shadow: 0 1px 2px rgba(0,0,0,.3), 0 4px 16px rgba(0,0,0,.25);
  }
}

:root[data-theme="dark"] {
  --bg: #15161a;
  --surface: #1e2026;
  --surface-2: #272a31;
  --ink: #eceae4;
  --ink-2: #a9a79f;
  --ink-3: #7b7a73;
  --line: #333740;
  --accent: #4ba06c;
  --accent-ink: #0d1f15;
  --accent-soft: #1d3327;
  --good: #5bbd83;
  --good-soft: #17301f;
  --bad: #e07a7a;
  --bad-soft: #341d1d;
  --warn-soft: #302819;
  --shadow: 0 1px 2px rgba(0,0,0,.3), 0 4px 16px rgba(0,0,0,.25);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  padding-bottom: 40px;
}

h1, h2, h3 { line-height: 1.25; margin: 0; }
p { margin: 0 0 10px; }
.muted { color: var(--ink-2); }
.small { font-size: 14px; }
.hidden { display: none !important; }

/* ---------- top bar ---------- */
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  gap: 12px;
  padding: 14px 16px;
  background: var(--surface);
  border-bottom: 1px solid var(--line);
  position: sticky; top: 0; z-index: 20;
}
.brand { display: flex; align-items: center; gap: 11px; min-width: 0; }
.logo {
  font-size: 20px; width: 38px; height: 38px; flex: none;
  display: grid; place-items: center;
  background: var(--accent-soft); border-radius: 10px;
}
.topbar h1 { font-size: 16px; font-weight: 650; letter-spacing: -.01em; }
.sub { margin: 0; font-size: 12.5px; color: var(--ink-3); }
.topright { display: flex; align-items: center; gap: 8px; flex: none; }
.streak {
  display: flex; align-items: center; gap: 4px;
  background: var(--surface-2); border: 1px solid var(--line);
  padding: 5px 10px; border-radius: 999px;
  font-size: 13.5px; font-weight: 600; font-variant-numeric: tabular-nums;
}
.flame { font-size: 13px; }
.icon-btn {
  width: 34px; height: 34px; border-radius: 9px;
  border: 1px solid var(--line); background: var(--surface-2);
  color: var(--ink-2); font-size: 15px; cursor: pointer;
}
.icon-btn:hover { color: var(--ink); }

/* ---------- tabs ---------- */
.tabs {
  display: flex; gap: 2px;
  padding: 10px 16px 0;
  max-width: 760px; margin: 0 auto;
}
.tab {
  flex: 1;
  background: none; border: 0;
  border-bottom: 2px solid transparent;
  padding: 9px 6px; font-size: 14.5px; font-weight: 550;
  color: var(--ink-3); cursor: pointer;
  font-family: inherit;
}
.tab.active { color: var(--ink); border-bottom-color: var(--accent); }

main { max-width: 760px; margin: 0 auto; padding: 18px 16px 0; }
.view { display: none; }
.view.active { display: block; }

.section-head { font-size: 13px; text-transform: uppercase; letter-spacing: .07em; color: var(--ink-3); margin: 26px 0 10px; font-weight: 650; }
.section-head:first-child { margin-top: 4px; }

/* ---------- hero + ring ---------- */
.hero { margin-bottom: 20px; }
.hero h2 { font-size: 22px; letter-spacing: -.015em; margin-bottom: 4px; }

.ring-row {
  display: flex; align-items: center; gap: 20px;
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 18px; box-shadow: var(--shadow);
  flex-wrap: wrap;
}
.ring-wrap { position: relative; width: 108px; height: 108px; flex: none; }
.ring { width: 108px; height: 108px; transform: rotate(-90deg); }
.ring circle { fill: none; stroke-width: 9; }
.ring-bg { stroke: var(--surface-2); }
.ring-fg {
  stroke: var(--accent); stroke-linecap: round;
  stroke-dasharray: 326.7; stroke-dashoffset: 326.7;
  transition: stroke-dashoffset .6s cubic-bezier(.4,0,.2,1);
}
.ring-label { position: absolute; inset: 0; display: grid; place-content: center; text-align: center; }
.ring-label strong { font-size: 22px; font-variant-numeric: tabular-nums; letter-spacing: -.02em; }
.ring-label span { font-size: 11px; color: var(--ink-3); }
.ring-stats { display: flex; gap: 22px; flex-wrap: wrap; }
.ring-stats div { display: flex; flex-direction: column; }
.ring-stats strong { font-size: 20px; font-variant-numeric: tabular-nums; }
.ring-stats span { font-size: 12px; color: var(--ink-3); }

/* ---------- tiers ---------- */
.tier-grid { display: grid; gap: 10px; }
.tier {
  display: flex; align-items: center; gap: 14px;
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 15px 16px;
  cursor: pointer; text-align: left; width: 100%;
  font-family: inherit; color: inherit;
  box-shadow: var(--shadow);
  transition: transform .12s ease, border-color .12s ease;
}
.tier:hover:not(.locked) { transform: translateY(-1px); border-color: var(--accent); }
.tier.locked { cursor: not-allowed; opacity: .62; }
.tier-badge {
  width: 42px; height: 42px; flex: none; border-radius: 11px;
  display: grid; place-items: center; font-size: 18px;
  background: var(--accent-soft);
}
.tier.locked .tier-badge { background: var(--surface-2); }
.tier-main { flex: 1; min-width: 0; }
.tier-main h4 { margin: 0 0 2px; font-size: 15.5px; font-weight: 620; }
.tier-main p { margin: 0; font-size: 13px; color: var(--ink-3); }
.tier-bar { height: 5px; background: var(--surface-2); border-radius: 99px; margin-top: 9px; overflow: hidden; }
.tier-bar i { display: block; height: 100%; background: var(--accent); border-radius: 99px; transition: width .4s ease; }
.tier-pct { font-size: 13px; font-variant-numeric: tabular-nums; color: var(--ink-2); flex: none; font-weight: 600; }

/* ---------- topics ---------- */
.topic-list { display: grid; gap: 7px; }
.topic {
  display: flex; align-items: center; gap: 12px;
  background: var(--surface); border: 1px solid var(--line);
  border-radius: 9px; padding: 10px 13px; font-size: 14px;
}
.topic-name { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.topic-bar { width: 84px; height: 5px; background: var(--surface-2); border-radius: 99px; overflow: hidden; flex: none; }
.topic-bar i { display: block; height: 100%; border-radius: 99px; }
.topic-score { font-size: 12.5px; color: var(--ink-3); font-variant-numeric: tabular-nums; width: 46px; text-align: right; flex: none; }

/* ---------- note ---------- */
.note {
  background: var(--warn-soft); border: 1px solid var(--line);
  border-left: 3px solid #c98a2e;
  border-radius: 9px; padding: 13px 15px; margin: 24px 0 18px;
  font-size: 13.5px; line-height: 1.6; color: var(--ink-2);
}
.note strong { color: var(--ink); }

.danger-link {
  background: none; border: 0; color: var(--ink-3);
  font-size: 13px; cursor: pointer; padding: 6px 0;
  text-decoration: underline; font-family: inherit;
}
.danger-link:hover { color: var(--bad); }

/* ---------- question ---------- */
.q-head { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-bottom: 9px; }
.q-meta { display: flex; gap: 6px; flex-wrap: wrap; }
.pill {
  font-size: 11px; text-transform: uppercase; letter-spacing: .05em; font-weight: 650;
  background: var(--accent); color: var(--accent-ink);
  padding: 3px 8px; border-radius: 5px;
}
.pill.ghost { background: var(--surface-2); color: var(--ink-2); }
.q-progress { font-size: 13px; color: var(--ink-3); font-variant-numeric: tabular-nums; flex: none; }

.progress-bar { height: 4px; background: var(--surface-2); border-radius: 99px; overflow: hidden; margin-bottom: 16px; }
.progress-bar div { height: 100%; background: var(--accent); border-radius: 99px; transition: width .3s ease; width: 0; }

.card {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow);
}
.qtext { font-size: 17px; line-height: 1.5; margin-bottom: 6px; white-space: pre-wrap; }
.src { font-size: 12px; color: var(--ink-3); margin-bottom: 16px; font-style: italic; }
.src:empty { display: none; }

.options { display: grid; gap: 8px; }
.opt {
  display: flex; align-items: flex-start; gap: 11px;
  background: var(--surface-2); border: 1.5px solid transparent;
  border-radius: 9px; padding: 12px 14px;
  cursor: pointer; text-align: left; width: 100%;
  font: inherit; font-size: 15px; color: inherit;
  transition: border-color .12s ease, background .12s ease;
}
.opt:hover:not(:disabled) { border-color: var(--accent); }
.opt:disabled { cursor: default; }
.opt .k {
  width: 22px; height: 22px; flex: none; border-radius: 6px;
  background: var(--surface); border: 1px solid var(--line);
  display: grid; place-items: center;
  font-size: 11.5px; font-weight: 700; color: var(--ink-3);
  margin-top: 1px;
}
.opt.correct { background: var(--good-soft); border-color: var(--good); }
.opt.correct .k { background: var(--good); color: #fff; border-color: var(--good); }
.opt.wrong { background: var(--bad-soft); border-color: var(--bad); }
.opt.wrong .k { background: var(--bad); color: #fff; border-color: var(--bad); }

.textbox { display: flex; gap: 8px; flex-wrap: wrap; }
.textbox input {
  flex: 1; min-width: 160px;
  padding: 12px 14px; font: inherit; font-family: var(--mono); font-size: 15px;
  background: var(--surface-2); color: var(--ink);
  border: 1.5px solid var(--line); border-radius: 9px;
}
.textbox input:focus { outline: none; border-color: var(--accent); }

.btn {
  padding: 11px 18px; border-radius: 9px;
  border: 1px solid var(--line); background: var(--surface-2);
  color: var(--ink); font: inherit; font-size: 14.5px; font-weight: 550;
  cursor: pointer; transition: background .12s ease;
}
.btn:hover { background: var(--line); }
.btn.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.btn.primary:hover { filter: brightness(1.08); }
.btn.ghost { background: none; }

.q-foot { display: flex; justify-content: space-between; gap: 10px; margin-top: 16px; }

.feedback { margin-top: 16px; padding: 14px 16px; border-radius: 9px; border: 1px solid var(--line); }
.feedback.ok { background: var(--good-soft); border-color: var(--good); }
.feedback.no { background: var(--bad-soft); border-color: var(--bad); }
.fb-head { font-weight: 650; font-size: 14.5px; margin-bottom: 5px; }
.feedback.ok .fb-head { color: var(--good); }
.feedback.no .fb-head { color: var(--bad); }
.fb-body { margin: 0; font-size: 14px; line-height: 1.6; color: var(--ink-2); white-space: pre-wrap; }

/* ---------- k-map ---------- */
.kmap-hint { font-size: 13.5px; color: var(--ink-2); margin-bottom: 14px; }
.kmap-scroll { overflow-x: auto; margin: 0 -4px 14px; padding: 0 4px 4px; }
table.km { border-collapse: separate; border-spacing: 3px; font-family: var(--mono); margin: 0 auto; }
table.km th {
  font: 600 11px/1 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color: var(--ink-3); padding: 4px; text-align: center; white-space: nowrap;
}
table.km th.corner { font-size: 10px; text-align: right; padding-right: 7px; }
.cell {
  width: 50px; height: 46px; border-radius: 8px;
  background: var(--surface-2); border: 1.5px solid var(--line);
  display: grid; place-items: center;
  font-size: 15px; font-weight: 600; color: var(--ink-3);
  cursor: pointer; user-select: none;
  transition: transform .1s ease, border-color .1s ease;
  font-family: var(--mono);
}
.cell.one { color: var(--ink); background: var(--accent-soft); border-color: var(--accent-soft); }
.cell.dc { color: var(--ink-2); background: var(--warn-soft); border-color: var(--warn-soft); }
.cell.zero { cursor: not-allowed; }
.cell.sel { border-color: var(--accent); transform: scale(.93); }
.cell.covered { box-shadow: inset 0 0 0 2px var(--good); }
.cell.solved { background: var(--good-soft); border-color: var(--good); color: var(--good); }

.kmap-actions { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 12px; }
.kmap-status { font-size: 13.5px; min-height: 20px; margin-bottom: 10px; color: var(--ink-2); }
.kmap-status.err { color: var(--bad); }
.kmap-status.ok { color: var(--good); }
.terms { display: flex; gap: 7px; flex-wrap: wrap; }
.term {
  font-family: var(--mono); font-size: 14px; font-weight: 600;
  background: var(--accent-soft); color: var(--ink);
  border: 1px solid var(--accent); border-radius: 7px;
  padding: 5px 11px;
}

/* ---------- done / review ---------- */
.done { text-align: center; padding: 50px 20px; }
.done h2 { font-size: 24px; margin-bottom: 8px; }
.done .btn { margin-top: 18px; }
.empty { text-align: center; padding: 50px 20px; color: var(--ink-3); }

.rev {
  display: flex; align-items: center; gap: 12px;
  background: var(--surface); border: 1px solid var(--line);
  border-radius: 9px; padding: 13px 15px; margin-bottom: 8px;
  cursor: pointer; width: 100%; text-align: left; font: inherit; color: inherit;
}
.rev:hover { border-color: var(--accent); }
.rev-main { flex: 1; min-width: 0; }
.rev-main p { margin: 0; font-size: 14.5px; }
.rev-main span { font-size: 12px; color: var(--ink-3); }
.rev-arrow { color: var(--ink-3); flex: none; }

footer {
  max-width: 760px; margin: 36px auto 0; padding: 18px 16px;
  border-top: 1px solid var(--line);
  font-size: 12px; color: var(--ink-3); text-align: center;
}
footer p { margin: 0; }

@media (max-width: 440px) {
  .cell { width: 42px; height: 42px; font-size: 14px; }
  .ring-stats { gap: 16px; }
  .ring-stats strong { font-size: 18px; }
  .qtext { font-size: 16px; }
}

/* Progress/Practice/Review belong to a subject; hide them on the subject list. */
body:not(.in-subject) .tab:not([data-view="subjects"]) { display: none; }
a.brand { color: inherit; text-decoration: none; }

/* ---------- flag + progress export (feedback.js) ---------- */
.feedback.hidden + .fb-flag { display: none; }
.fb-flag { margin-top: 8px; font-size: 13px; }
.fb-link {
  background: none; border: 0; padding: 6px 0; cursor: pointer;
  font: inherit; color: var(--ink-2); text-decoration: underline;
}
.fb-link:hover { color: var(--ink); }
.fb-form { display: grid; gap: 10px; margin-top: 6px; }
.fb-form fieldset { border: 0; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 4px 14px; }
.fb-form legend { padding: 0; margin-bottom: 4px; color: var(--ink-2); }
.fb-form label { display: inline-flex; align-items: center; gap: 5px; cursor: pointer; }
.fb-form input[type="radio"] { accent-color: var(--accent); }
.fb-form textarea {
  width: 100%; padding: 9px 11px; font: inherit; font-size: 14px; resize: vertical;
  background: var(--surface-2); color: var(--ink); border: 1.5px solid var(--line); border-radius: 9px;
}
.fb-form textarea:focus { outline: none; border-color: var(--accent); }
.fb-tools { display: flex; flex-wrap: wrap; justify-content: center; gap: 0 16px; margin-top: 6px; }
.fb-tools .fb-link { color: var(--ink-3); font-size: 12px; }

/* ---------- learn ---------- */
.learn-link { flex: none; font-size: 12.5px; font-weight: 600; color: var(--accent); text-decoration: none; }
.learn-link:hover { text-decoration: underline; }
.learn-title { font-size: 22px; letter-spacing: -.015em; margin-bottom: 6px; }
.learn-needs { font-size: 13.5px; color: var(--ink-2); }
.learn-needs a { color: var(--accent); font-weight: 600; }
.learn-card { margin-top: 12px; font-size: 15px; line-height: 1.65; overflow-wrap: anywhere; }
.learn-card h3 { font-size: 16.5px; margin: 18px 0 8px; }
.learn-card h3:first-child { margin-top: 0; }
.learn-card ul, .learn-card ol { margin: 0 0 10px; padding-left: 22px; }
.learn-card li { margin-bottom: 3px; }
.learn-card code {
  font-family: var(--mono); font-size: .9em;
  background: var(--surface-2); border-radius: 4px; padding: 1px 5px;
}
.learn-table { overflow-x: auto; margin: 0 0 12px; }
.learn-table table { border-collapse: collapse; font-size: 14px; overflow-wrap: normal; }
.learn-table th, .learn-table td { border: 1px solid var(--line); padding: 5px 11px; text-align: left; white-space: nowrap; }
.learn-table th { background: var(--surface-2); font-weight: 650; }
.learn-worked {
  margin: 16px 0 12px; padding: 10px 14px;
  border: 1px solid var(--line); border-radius: 9px; background: var(--surface-2);
}
.learn-worked summary { cursor: pointer; font-weight: 620; }
.learn-worked[open] summary { margin-bottom: 8px; }
.learn-worked code { background: var(--surface); }
.learn-again { border-left: 3px solid var(--accent); padding-left: 13px; margin: 12px 0; }
.learn-hook {
  background: var(--warn-soft); border: 1px solid var(--line); border-left: 3px solid #c98a2e;
  border-radius: 9px; padding: 12px 15px; margin-top: 16px;
}
.learn-hook p:last-child, .learn-card > p:last-child { margin-bottom: 0; }
.learn-hook-label {
  display: block; margin-bottom: 4px;
  font-size: 11px; text-transform: uppercase; letter-spacing: .07em; font-weight: 650; color: var(--ink-3);
}
.learn-foot { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; margin-top: 16px; }
.learn-foot .btn { text-decoration: none; }

/* ---------- hook review (srs.js) ---------- */
.srs-card { text-decoration: none; border-left: 3px solid #c98a2e; }
.srs-card .tier-badge { background: var(--warn-soft); }
.srs-next { margin: 0 0 2px; }
.srs-hook { margin: 10px 0 14px; font-size: 15.5px; line-height: 1.6; }
.srs-hook p { margin: 0; }
.srs-self { display: flex; flex-wrap: wrap; gap: 8px; }
.srs-btn { display: inline-block; text-decoration: none; }

/* ---------- mock exam (mock.js) ---------- */
.mock-bar { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; }
.mock-count { flex: 1; min-width: 0; }
.mock-timer {
  font: 650 19px/1 var(--mono); font-variant-numeric: tabular-nums;
  padding: 8px 10px; border-radius: 8px;
  background: var(--surface); border: 1.5px solid var(--line);
}
.mock-timer.low { color: var(--bad); border-color: var(--bad); }
.mock-meta { margin-bottom: 10px; }
.mock-run .opt[aria-pressed="true"] { background: var(--accent-soft); border-color: var(--accent); }
.mock-run .opt[aria-pressed="true"] .k { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.mock-nav { display: grid; grid-template-columns: repeat(auto-fill, minmax(40px, 1fr)); gap: 6px; }
.mock-nav button {
  height: 40px; border-radius: 8px; cursor: pointer;
  border: 1.5px solid var(--line); background: var(--surface); color: var(--ink-2);
  font: inherit; font-size: 13.5px; font-variant-numeric: tabular-nums;
}
.mock-nav .mock-done { background: var(--accent-soft); border-color: var(--accent-soft); color: var(--ink); }
.mock-nav button[aria-current] { border-color: var(--accent); font-weight: 700; }
.mock-trend { display: flex; align-items: flex-end; gap: 4px; height: 44px; margin-bottom: 12px; }
.mock-trend i { flex: 0 1 18px; background: var(--accent); border-radius: 3px 3px 0 0; }
.mock-hist .rev { text-decoration: none; }
.mock-row { flex-wrap: wrap; }
.mock-links { display: flex; gap: 12px; flex: none; }
.mock-review { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.mock-review li {
  background: var(--surface); border: 1px solid var(--line); border-left: 3px solid var(--bad);
  border-radius: 9px; padding: 12px 14px; overflow-wrap: anywhere;
}
.mock-review li.ok { border-left-color: var(--good); }
.mock-review .small { margin-bottom: 4px; }
.mock-q { font-size: 15px; }
@media (max-width: 440px) {
  .mock-links { flex-basis: 100%; justify-content: flex-end; margin-top: -4px; }
}

/* ---------- wrong-answer panel (explain-ui.js) ---------- */
.xp { display: grid; gap: 12px; margin-top: 10px; font-size: 14.5px; line-height: 1.6; overflow-wrap: anywhere; }
.xp-part { background: var(--surface); border: 1px solid var(--line); border-radius: 9px; padding: 11px 14px; min-width: 0; }
.xp-answer { font-family: var(--mono); font-size: 14px; white-space: pre-wrap; }
.xp-how p:last-child, .xp-hook p:last-child { margin-bottom: 0; }
.xp-how p:first-child { margin-top: 0; }
.xp-loading, .xp-note { color: var(--ink-2); font-size: 13.5px; margin: 0; }
.xp-loading::after { content: ""; display: inline-block; width: .8em; height: .8em; margin-left: 8px; vertical-align: -1px;
  border: 2px solid var(--line); border-top-color: var(--ink-2); border-radius: 50%; animation: xp-spin .8s linear infinite; }
@keyframes xp-spin { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) { .xp-loading::after { animation: none; } }
.xp-note { margin-top: 8px; font-style: italic; }
.xp-hook { margin-top: 0; }
.xp-actions { display: flex; flex-wrap: wrap; gap: 8px; }
.xp-actions .btn { flex: 1 1 auto; padding: 9px 14px; font-size: 14px; }
.xp-actions .btn:disabled { opacity: .55; cursor: default; }

/* ---------- mock written part (mock.js; the rest of .wr-* is injected by widgets/written.js) ---------- */
.wr-mock { margin-top: 8px; }
.wr-mock-answer { margin: 0 0 8px; padding: 8px 10px; font-size: 14px; line-height: 1.55; white-space: pre-wrap; overflow-wrap: anywhere;
  background: var(--surface-2); border-radius: 8px; color: var(--ink); }
.wr-mock-q { white-space: pre-wrap; }

/* Storyboard player */
.story-stage { display: block; width: 100%; height: auto; background: var(--surface-2); border-radius: 9px; }
/* Phones: run edge to edge, since every pixel of width goes to label size. */
@media (max-width: 560px) { .story-stage { width: calc(100vw - 12px); max-width: none; margin-left: calc(50% - 50vw + 6px); } }
.story-node rect { fill: var(--surface); stroke: var(--ink-3); stroke-width: 1.5; transition: fill .25s, stroke .25s; }
.story-node text { fill: var(--ink); font-family: var(--mono); font-weight: 600; }
.story-node.plain rect { fill: transparent; stroke: none; }
.story-node.plain text { fill: var(--ink-2); font-weight: 500; }
.story-node, .story-link { transition: opacity .25s; }
.story-node.is-active rect { fill: var(--warn-soft); stroke: #c98a12; stroke-width: 3; }
.story-node.is-done rect { fill: var(--good-soft); stroke: var(--good); }
.story-node.is-wrong rect { fill: var(--bad-soft); stroke: var(--bad); }
.story-node.is-active.plain rect, .story-node.is-done.plain rect, .story-node.is-wrong.plain rect { stroke-width: 1.5; }
.story-node.is-faded, .story-link.is-faded { opacity: .3; }
.is-hidden { opacity: 0; pointer-events: none; }
.story-link line { stroke: var(--ink-3); stroke-width: 2; }
.story-link.is-active line { stroke: #c98a12; stroke-width: 3; }
.story-link.is-done line { stroke: var(--good); }
.story-link.is-wrong line { stroke: var(--bad); }
.story-tip { fill: var(--ink-3); }
.story-link-text { fill: var(--ink-2); font-size: 14px; }
.story-say { margin: 12px 0 0; min-height: 3em; line-height: 1.5; }
.story-answer { margin: 8px 0 0; font-family: var(--mono); font-weight: 600; color: var(--good); white-space: pre-wrap; }
.story-bar { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-top: 10px; }
.story-bar .btn { padding: 8px 14px; font-size: 14px; }
.story-bar .btn:disabled { opacity: .55; cursor: default; }
.story-step { margin-left: auto; color: var(--ink-3); font-size: 13px; }
@media (prefers-reduced-motion: reduce) { .story-node, .story-link, .story-node rect { transition: none; } }

/* Turnstile: out of sight until Cloudflare asks for a click. Not display:none, so it can run. */
.ts-box { position: fixed; left: -9999px; bottom: 16px; }
.ts-box.ts-asking { left: 50%; transform: translateX(-50%); z-index: 100; background: var(--surface); border: 1px solid var(--line); border-radius: 9px; padding: 8px; box-shadow: var(--shadow); }