/* Good Strategy / Bad Strategy 学习伴侣
   视觉取向：参谋部的作战地图桌。蓝色 = 己方 / 好战略，红色 = 对方 / 坏战略（沿用军用标图的敌我配色），
   赭色 = 地形与目标。 */

:root {
  --bg: #e9ede6;
  --paper: #f5f7f2;
  --paper-2: #eef1ea;
  --ink: #16222a;
  --ink-2: #33434c;
  --muted: #5a6970;
  --rule: #c8d0c7;
  --rule-soft: #dbe1d8;
  --friendly: #2257a8;
  --friendly-soft: #d7e2f3;
  --hostile: #bd3a2c;
  --hostile-soft: #f3dcd8;
  --terrain: #805a10;
  --terrain-soft: #efe3c6;
  --good: #2d7a4c;
  --good-soft: #d6eadb;
  --mark-hostile: #a83124;
  --mark-good: #286f45;
  --grid: rgba(34, 87, 168, 0.07);
  --shadow: 0 1px 0 rgba(22, 34, 42, 0.04), 0 6px 18px -10px rgba(22, 34, 42, 0.25);
  /* 系统自带的中文字体优先；没有时才下载 Noto（浏览器只下载真正用到的字体） */
  --serif: "Songti SC", "STSong", "Noto Serif SC", "SimSun", serif;
  --sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;
  --stencil: "Saira Stencil One", "Impact", "Arial Narrow", sans-serif;
  --radius: 6px;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #0e1519;
    --paper: #141e24;
    --paper-2: #18242b;
    --ink: #e2e8e3;
    --ink-2: #c3ccc7;
    --muted: #93a1a7;
    --rule: #2b3a42;
    --rule-soft: #223037;
    --friendly: #79a3ea;
    --friendly-soft: #1b2c47;
    --hostile: #e57466;
    --hostile-soft: #402320;
    --terrain: #d8ad55;
    --terrain-soft: #3a2f17;
    --good: #66bd88;
    --good-soft: #1b3525;
    --mark-hostile: #e57466;
    --mark-good: #66bd88;
    --grid: rgba(121, 163, 234, 0.06);
    --shadow: 0 1px 0 rgba(0, 0, 0, 0.3), 0 8px 22px -12px rgba(0, 0, 0, 0.7);
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0e1519;
  --paper: #141e24;
  --paper-2: #18242b;
  --ink: #e2e8e3;
  --ink-2: #c3ccc7;
  --muted: #93a1a7;
  --rule: #2b3a42;
  --rule-soft: #223037;
  --friendly: #79a3ea;
  --friendly-soft: #1b2c47;
  --hostile: #e57466;
  --hostile-soft: #402320;
  --terrain: #d8ad55;
  --terrain-soft: #3a2f17;
  --good: #66bd88;
  --good-soft: #1b3525;
  --mark-hostile: #e57466;
  --mark-good: #66bd88;
  --grid: rgba(121, 163, 234, 0.06);
  --shadow: 0 1px 0 rgba(0, 0, 0, 0.3), 0 8px 22px -12px rgba(0, 0, 0, 0.7);
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

html { scroll-padding-top: 72px; }

body {
  margin: 0;
  background-color: var(--bg);
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 48px 48px;
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--friendly); text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }

button, input, textarea, select { font: inherit; color: inherit; }
:focus-visible { outline: 2px solid var(--friendly); outline-offset: 2px; }

h1, h2, h3, h4 { font-family: var(--serif); text-wrap: balance; margin: 0; line-height: 1.3; }
h2 { font-size: 1.6rem; font-weight: 700; }
h3 { font-size: 1.2rem; font-weight: 700; }
h4 { font-size: 1.02rem; font-weight: 700; }
p { margin: 0; }

.mono { font-family: var(--mono); }
.stencil { font-family: var(--stencil); font-weight: 400; letter-spacing: 0.02em; }
.muted { color: var(--muted); }
.small { font-size: 0.86rem; }
.tag {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 1px 7px;
  border-radius: 3px;
  border: 1px solid var(--rule);
  color: var(--muted);
  white-space: nowrap;
}
.tag.friendly { color: var(--friendly); border-color: currentColor; }
.tag.hostile { color: var(--hostile); border-color: currentColor; }
.tag.terrain { color: var(--terrain); border-color: currentColor; }
.tag.good { color: var(--good); border-color: currentColor; }

/* ---------- Top bar ---------- */
.topbar {
  position: sticky;
  top: env(safe-area-inset-top, 0px);
  z-index: 20;
  background: var(--paper);
  background: color-mix(in srgb, var(--paper) 92%, transparent);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--rule);
}
.topbar-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding-inline: 16px;
  display: flex;
  align-items: center;
  gap: 18px;
  min-height: 56px;
}
.brand {
  display: flex;
  align-items: baseline;
  gap: 8px;
  text-decoration: none;
  color: var(--ink);
  white-space: nowrap;
}
.brand .stencil { font-size: 1.35rem; color: var(--friendly); }
.brand .stencil b { color: var(--hostile); font-weight: 400; }
.brand span.cn { font-family: var(--serif); font-size: 0.9rem; color: var(--muted); }
.tabs {
  display: flex;
  gap: 2px;
  overflow-x: auto;
  scrollbar-width: none;
  flex: 1;
}
.tabs::-webkit-scrollbar { display: none; }
.tabs a {
  flex: none;
  padding: 16px 12px 14px;
  text-decoration: none;
  color: var(--muted);
  font-size: 0.95rem;
  border-bottom: 3px solid transparent;
  white-space: nowrap;
}
.tabs a:hover { color: var(--ink); }
.tabs a[aria-current="page"] { color: var(--ink); border-bottom-color: var(--friendly); font-weight: 700; }
.progress-pill {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--muted);
  white-space: nowrap;
}
@media (max-width: 640px) {
  .brand span.cn, .progress-pill { display: none; }
  .topbar-inner { gap: 8px; }
  .tabs a { padding-inline: 9px; font-size: 0.9rem; }
}
/* 窄屏上五个标签放不下一行：换到自己的一行，保证“练习”可见 */
@media (max-width: 480px) {
  .topbar-inner { flex-wrap: wrap; min-height: 0; padding-block: 8px 0; }
  .brand { order: 1; }
  .tabs { order: 3; flex-basis: 100%; justify-content: space-between; }
  .tabs a { padding: 6px 4px 8px; font-size: 0.92rem; }
}

/* ---------- Layout ---------- */
main { max-width: 1120px; margin: 0 auto; padding-inline: 16px; padding-block: 28px 80px; }
.view { display: flex; flex-direction: column; gap: 36px; }
.view[hidden] { display: none !important; }
.section { display: flex; flex-direction: column; gap: 16px; }
.section-head { display: flex; flex-direction: column; gap: 6px; }
.eyebrow {
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--terrain);
}
.lede { color: var(--ink-2); max-width: 68ch; }
.prose { display: flex; flex-direction: column; gap: 12px; max-width: 70ch; }
.prose ul, .prose ol { margin: 0; padding-left: 1.3em; display: flex; flex-direction: column; gap: 4px; }

.panel {
  background: var(--paper);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.panel-pad { padding: 20px; }
@media (max-width: 520px) { .panel-pad { padding: 16px; } }

.grid-2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; }
@media (max-width: 900px) { .grid-3, .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 620px) { .grid-2, .grid-3, .grid-4 { grid-template-columns: minmax(0, 1fr); } }

/* ---------- Hero ---------- */
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  gap: 28px;
  align-items: center;
}
@media (max-width: 860px) { .hero { grid-template-columns: minmax(0, 1fr); } }
.hero h1 {
  font-size: clamp(1.9rem, 4.2vw, 2.8rem);
  font-weight: 700;
  line-height: 1.2;
}
.hero h1 .en {
  display: block;
  font-family: var(--stencil);
  font-weight: 400;
  font-size: 0.5em;
  color: var(--muted);
  letter-spacing: 0.04em;
  margin-bottom: 8px;
}
.hero-copy { display: flex; flex-direction: column; gap: 16px; }
.thesis {
  font-family: var(--serif);
  font-size: 1.12rem;
  line-height: 1.8;
  border-left: 3px solid var(--friendly);
  padding-left: 14px;
}
.hero-meta { display: flex; flex-wrap: wrap; gap: 8px; }

/* ---------- Figures ---------- */
.figure { display: flex; flex-direction: column; gap: 12px; }
.figure-head { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: baseline; gap: 8px; }
.svg-wrap { width: 100%; overflow-x: auto; }
.svg-wrap svg { display: block; width: 100%; height: auto; min-width: max(300px, calc(var(--vbw, 400px) * 0.8)); }
.caption { font-size: 0.9rem; color: var(--muted); max-width: 72ch; }
.note-illus {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--muted);
  letter-spacing: 0.04em;
}
svg text { font-family: var(--sans); fill: var(--ink); }
svg .t-mono { font-family: var(--mono); }
svg .t-muted { fill: var(--muted); }
svg .t-friendly { fill: var(--friendly); }
svg .t-hostile { fill: var(--hostile); }
svg .t-terrain { fill: var(--terrain); }

.controls { display: flex; flex-wrap: wrap; gap: 10px 16px; align-items: center; }
.btn {
  border: 1px solid var(--rule);
  background: var(--paper-2);
  padding: 6px 14px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.92rem;
  line-height: 1.5;
  transition: background 0.15s, border-color 0.15s;
}
.btn:hover { border-color: var(--friendly); }
a.btn { text-decoration: none; color: var(--ink); display: inline-block; }
a.btn.primary { color: var(--paper); }
.btn.primary { background: var(--friendly); border-color: var(--friendly); color: var(--paper); }
.btn.primary:hover { filter: brightness(1.08); }
.btn[aria-pressed="true"] { background: var(--friendly-soft); border-color: var(--friendly); color: var(--friendly); font-weight: 700; }
.btn:disabled { opacity: 0.5; cursor: default; }
.seg { display: inline-flex; flex-wrap: wrap; gap: 1px; background: var(--rule); border: 1px solid var(--rule); border-radius: 4px; overflow: hidden; }
.seg button { border: 0; background: var(--paper-2); padding: 6px 12px; cursor: pointer; font-size: 0.9rem; flex: 1 0 auto; }
.seg button[aria-pressed="true"] { background: var(--friendly); color: var(--paper); }
.range { display: flex; align-items: center; gap: 10px; font-size: 0.9rem; }
.range input[type="range"] { accent-color: var(--friendly); width: 160px; max-width: 45vw; }
.readout { font-family: var(--mono); font-variant-numeric: tabular-nums; font-size: 0.9rem; }

.stage-caption {
  min-height: 3.6em;
  background: var(--paper-2);
  border: 1px dashed var(--rule);
  border-radius: 4px;
  padding: 10px 14px;
  font-size: 0.95rem;
}
.stage-caption b { color: var(--friendly); }

/* ---------- Cards / lists ---------- */
.card {
  background: var(--paper);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 16px 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.card h4 { display: flex; gap: 8px; align-items: baseline; }
.card .num { font-family: var(--stencil); color: var(--terrain); font-size: 1.2rem; }
.card.hostile { border-top: 3px solid var(--hostile); }
.card.friendly { border-top: 3px solid var(--friendly); }
.card.terrain { border-top: 3px solid var(--terrain); }
.card p, .card li { font-size: 0.95rem; }
.card ul { margin: 0; padding-left: 1.2em; }

.kv { display: grid; grid-template-columns: 7.5em minmax(0, 1fr); gap: 6px 14px; font-size: 0.95rem; }
.kv dt { color: var(--muted); font-size: 0.86rem; padding-top: 2px; }
.kv dd { margin: 0; }
@media (max-width: 520px) { .kv { grid-template-columns: minmax(0, 1fr); gap: 2px; } .kv dd { margin-bottom: 8px; } }

/* ---------- Book map ---------- */
.bookmap { display: grid; grid-template-columns: 0.75fr 1fr 1.6fr 0.95fr; gap: 12px; align-items: start; }
@media (max-width: 900px) { .bookmap { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); } }
@media (max-width: 520px) { .bookmap { grid-template-columns: minmax(0, 1fr); } }
.part {
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--paper);
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.part-title { display: flex; flex-direction: column; gap: 2px; padding-bottom: 6px; border-bottom: 1px solid var(--rule-soft); }
.part-title .stencil { color: var(--friendly); font-size: 0.95rem; }
.part-title h4 { font-size: 0.98rem; }
.part-title p { font-size: 0.82rem; color: var(--muted); line-height: 1.5; }
.chips { display: flex; flex-direction: column; gap: 6px; }
.part.wide .chips { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); }
@media (max-width: 520px) { .part.wide .chips { grid-template-columns: minmax(0, 1fr); } }
.chip {
  display: flex;
  align-items: center;
  gap: 8px;
  text-align: left;
  border: 1px solid var(--rule);
  background: var(--paper-2);
  border-radius: 4px;
  padding: 6px 8px;
  cursor: pointer;
  font-size: 0.88rem;
  line-height: 1.35;
  width: 100%;
}
.chip:hover { border-color: var(--friendly); }
.chip .cno { font-family: var(--mono); font-size: 0.72rem; color: var(--muted); min-width: 1.8em; }
.chip .ctitle { flex: 1; }
.chip .core { width: 8px; height: 8px; border-radius: 50%; background: var(--terrain); flex: none; }
.chip .core.off { background: transparent; border: 1px solid var(--rule); }
.chip.done .ctitle { color: var(--muted); text-decoration: line-through; text-decoration-color: var(--good); }
.chip.active { border-color: var(--friendly); background: var(--friendly-soft); }
.legend { display: flex; flex-wrap: wrap; gap: 14px; font-size: 0.82rem; color: var(--muted); align-items: center; }
.legend i { display: inline-block; width: 8px; height: 8px; border-radius: 50%; background: var(--terrain); margin-right: 6px; vertical-align: 1px; }
.legend i.off { background: transparent; border: 1px solid var(--rule); }

.detail { border-left: 3px solid var(--friendly); }
.detail-head { display: flex; justify-content: space-between; gap: 10px; flex-wrap: wrap; align-items: baseline; }

/* ---------- Cheat sheet ---------- */
.cheat { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 0; border: 1px solid var(--rule); border-radius: var(--radius); overflow: hidden; background: var(--paper); }
.cheat > div { padding: 16px; border-right: 1px solid var(--rule); display: flex; flex-direction: column; gap: 8px; }
.cheat > div:last-child { border-right: 0; }
.cheat h4 { font-size: 0.95rem; }
.cheat ol, .cheat ul { margin: 0; padding-left: 1.2em; font-size: 0.9rem; display: flex; flex-direction: column; gap: 3px; }
@media (max-width: 900px) { .cheat { grid-template-columns: repeat(2, minmax(0, 1fr)); } .cheat > div:nth-child(2) { border-right: 0; } .cheat > div:nth-child(-n+2) { border-bottom: 1px solid var(--rule); } }
@media (max-width: 520px) { .cheat { grid-template-columns: minmax(0, 1fr); } .cheat > div { border-right: 0; border-bottom: 1px solid var(--rule); } .cheat > div:last-child { border-bottom: 0; } }

/* ---------- Frameworks TOC ---------- */
.fig-toc { display: flex; flex-wrap: wrap; gap: 8px; }
.fig-toc a {
  font-size: 0.86rem;
  text-decoration: none;
  border: 1px solid var(--rule);
  background: var(--paper);
  color: var(--ink-2);
  padding: 3px 10px;
  border-radius: 999px;
}
.fig-toc a:hover { border-color: var(--friendly); color: var(--friendly); }
.fig-toc a .mono { color: var(--muted); font-size: 0.72rem; margin-right: 4px; }

.two-col { display: grid; grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr); gap: 20px; align-items: start; }
@media (max-width: 860px) { .two-col { grid-template-columns: minmax(0, 1fr); } }

/* ---------- Kernel ---------- */
.example-picker { display: flex; flex-wrap: wrap; gap: 6px; }
.kernel-text { display: flex; flex-direction: column; gap: 10px; }
.kernel-step {
  border: 1px solid var(--rule);
  border-radius: 4px;
  padding: 10px 12px;
  background: var(--paper-2);
  opacity: 0.7;
  transition: opacity 0.3s, border-color 0.3s;
}
.kernel-step.on { opacity: 1; border-color: var(--friendly); background: var(--paper); }
.kernel-step.seen { opacity: 0.85; }
.kernel-step h5 { margin: 0 0 4px; font-size: 0.9rem; font-family: var(--serif); display: flex; gap: 8px; align-items: baseline; }
.kernel-step h5 .mono { color: var(--friendly); font-size: 0.72rem; }
.kernel-step p { font-size: 0.92rem; }

/* ---------- Detector ---------- */
textarea {
  width: 100%;
  min-height: 150px;
  resize: vertical;
  padding: 12px;
  border: 1px solid var(--rule);
  border-radius: 4px;
  background: var(--paper-2);
  line-height: 1.7;
}
.hl-out { background: var(--paper-2); border: 1px solid var(--rule); border-radius: 4px; padding: 12px; white-space: pre-wrap; line-height: 1.9; font-size: 0.95rem; }
/* 四类高亮除了颜色还用不同的下划线区分，色觉障碍的读者也能分辨 */
mark.fluff { background: var(--hostile-soft); color: var(--mark-hostile); border-radius: 2px; padding: 0 2px; text-decoration: underline wavy; text-underline-offset: 3px; }
mark.goal { background: var(--terrain-soft); color: var(--terrain); border-radius: 2px; padding: 0 2px; text-decoration: underline dotted; text-underline-offset: 3px; }
mark.choice { background: var(--friendly-soft); color: var(--friendly); border-radius: 2px; padding: 0 2px; text-decoration: underline; text-underline-offset: 3px; }
mark.challenge { background: var(--good-soft); color: var(--mark-good); border-radius: 2px; padding: 0 2px; text-decoration: underline double; text-underline-offset: 3px; }
.meters { display: flex; flex-direction: column; gap: 10px; }
.meter { display: grid; grid-template-columns: 10.5em minmax(0, 1fr) 3.2em; gap: 10px; align-items: center; font-size: 0.9rem; }
.meter .bar { height: 8px; background: var(--rule-soft); border-radius: 4px; overflow: hidden; }
.meter .bar i { display: block; height: 100%; background: var(--hostile); width: 0; transition: width 0.5s; }
.meter .bar i.ok { background: var(--good); }
.meter .readout { text-align: right; }
.verdict { font-size: 0.92rem; padding: 10px 12px; border-radius: 4px; background: var(--paper-2); border: 1px solid var(--rule); }
.verdict ul { margin: 6px 0 0; padding-left: 1.2em; }

/* ---------- AI box ---------- */
.ai-box { border: 1px dashed var(--friendly); border-radius: 4px; padding: 12px 14px; background: var(--friendly-soft); display: flex; flex-direction: column; gap: 8px; }
.ai-box[hidden] { display: none !important; }
.ai-out { white-space: pre-wrap; font-size: 0.93rem; line-height: 1.8; color: var(--ink); }
.ai-status { font-size: 0.82rem; color: var(--muted); }

/* ---------- Chapters ---------- */
.part-block { display: flex; flex-direction: column; gap: 10px; }
.part-block > header { display: flex; gap: 12px; align-items: baseline; flex-wrap: wrap; }
.part-block > header .stencil { color: var(--friendly); font-size: 1.1rem; }
details.chapter {
  background: var(--paper);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
}
details.chapter > summary {
  list-style: none;
  cursor: pointer;
  padding: 14px 16px;
  display: grid;
  grid-template-columns: 3.2em minmax(0, 1fr) auto;
  gap: 12px;
  align-items: center;
}
details.chapter > summary::-webkit-details-marker { display: none; }
details.chapter > summary .no { font-family: var(--stencil); font-size: 1.5rem; color: var(--terrain); line-height: 1; }
details.chapter > summary .t { display: flex; flex-direction: column; gap: 2px; }
details.chapter > summary .t b { font-family: var(--serif); font-size: 1.05rem; }
details.chapter > summary .t span { font-size: 0.86rem; color: var(--muted); line-height: 1.5; }
details.chapter > summary .right { display: flex; gap: 8px; align-items: center; }
details.chapter[open] > summary { border-bottom: 1px solid var(--rule-soft); }
.chapter-body { padding: 16px 18px 18px; display: flex; flex-direction: column; gap: 14px; }
.chapter-body .kv dd ul { margin: 0; padding-left: 1.1em; }
.check { display: inline-flex; gap: 6px; align-items: center; font-size: 0.84rem; color: var(--muted); cursor: pointer; }
.check input { accent-color: var(--good); width: 16px; height: 16px; }
.links-row { display: flex; flex-wrap: wrap; gap: 8px; }
.verify { font-size: 0.8rem; color: var(--muted); border-top: 1px dotted var(--rule); padding-top: 8px; }

/* ---------- Blind spots ---------- */
.blind { display: flex; flex-direction: column; gap: 12px; }
.blind-card { background: var(--paper); border: 1px solid var(--rule); border-radius: var(--radius); padding: 18px 20px; display: grid; grid-template-columns: 3em minmax(0, 1fr); gap: 4px 14px; }
.blind-card .n { font-family: var(--stencil); font-size: 1.8rem; color: var(--hostile); line-height: 1; grid-row: span 3; }
.blind-card h3 { font-size: 1.1rem; }
.blind-card .cols { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px 20px; margin-top: 6px; }
.blind-card .cols > div { display: flex; flex-direction: column; gap: 4px; }
.blind-card .cols h5 { margin: 0; font-size: 0.78rem; font-family: var(--mono); letter-spacing: 0.08em; color: var(--muted); text-transform: uppercase; }
.blind-card .cols p, .blind-card .cols li { font-size: 0.94rem; }
.blind-card .cols ul { margin: 0; padding-left: 1.2em; }
.blind-card .cols .full { grid-column: 1 / -1; }
@media (max-width: 700px) { .blind-card { grid-template-columns: minmax(0, 1fr); } .blind-card .n { grid-row: auto; } .blind-card .cols { grid-template-columns: minmax(0, 1fr); } }

/* ---------- Practice ---------- */
.practice-tabs { display: flex; flex-wrap: wrap; gap: 8px; }
.q-card { background: var(--paper); border: 1px solid var(--rule); border-radius: var(--radius); padding: 18px; display: flex; flex-direction: column; gap: 12px; }
.q-meta { display: flex; justify-content: space-between; gap: 8px; flex-wrap: wrap; align-items: center; }
.q-stem { font-family: var(--serif); font-size: 1.05rem; line-height: 1.75; }
.q-options { display: flex; flex-direction: column; gap: 8px; }
.q-opt {
  text-align: left;
  border: 1px solid var(--rule);
  background: var(--paper-2);
  border-radius: 4px;
  padding: 10px 12px;
  cursor: pointer;
  display: grid;
  grid-template-columns: 1.6em minmax(0, 1fr);
  gap: 8px;
  line-height: 1.6;
}
.q-opt:hover:not(:disabled) { border-color: var(--friendly); }
.q-opt .letter { font-family: var(--mono); color: var(--muted); }
.q-opt.correct { border-color: var(--good); background: var(--good-soft); }
.q-opt.wrong { border-color: var(--hostile); background: var(--hostile-soft); }
.q-opt[aria-pressed="true"]:not(:disabled) { border-color: var(--friendly); background: var(--friendly-soft); }
.q-opt.missed { border-color: var(--good); border-style: dashed; }
.q-opt .tag { justify-self: start; grid-column: 2; }
.q-opt:disabled { cursor: default; }
.q-explain { font-size: 0.94rem; padding: 12px 14px; background: var(--paper-2); border-left: 3px solid var(--terrain); border-radius: 0 4px 4px 0; }
.q-nav { display: flex; justify-content: space-between; gap: 8px; flex-wrap: wrap; align-items: center; }
.score-row { display: flex; gap: 14px; flex-wrap: wrap; font-size: 0.88rem; color: var(--muted); align-items: center; }
.score-row b { color: var(--ink); font-family: var(--mono); }
select { border: 1px solid var(--rule); background: var(--paper-2); border-radius: 4px; padding: 5px 8px; max-width: 100%; }

.sort-item { background: var(--paper); border: 1px solid var(--rule); border-radius: var(--radius); padding: 14px 16px; display: flex; flex-direction: column; gap: 10px; }
.sort-item .stmt { font-family: var(--serif); font-size: 1rem; }
.sort-btns { display: flex; flex-wrap: wrap; gap: 6px; }
.sort-btns button { font-size: 0.85rem; padding: 4px 10px; }
.sort-btns button.correct { background: var(--good-soft); border-color: var(--good); color: var(--good); }
.sort-btns button.wrong { background: var(--hostile-soft); border-color: var(--hostile); color: var(--hostile); }
.sort-fb { font-size: 0.9rem; color: var(--ink-2); }

/* 案例题 */
details.case-list > summary { cursor: pointer; padding: 6px 0 10px; }
.case-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 10px; }
@media (max-width: 520px) { .case-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
.case-chip { text-align: left; border: 1px solid var(--rule); background: var(--paper); border-radius: var(--radius); padding: 10px 12px; display: flex; flex-direction: column; gap: 6px; cursor: pointer; }
.case-chip:hover { border-color: var(--friendly); }
.case-chip.active { border-color: var(--friendly); background: var(--friendly-soft); }
.case-chip .cno { font-family: var(--stencil); color: var(--terrain); font-size: 1.05rem; line-height: 1; }
.case-chip .ctitle { font-family: var(--serif); font-weight: 700; font-size: 0.95rem; line-height: 1.45; }
.case-chip .cmeta { display: flex; flex-wrap: wrap; gap: 4px; }
.case-text { max-width: 72ch; line-height: 1.85; }
.q-block { display: flex; flex-direction: column; gap: 10px; }
.q-block + .q-block { border-top: 1px dashed var(--rule); padding-top: 18px; margin-top: 4px; }
.debrief { border: 1px solid var(--good); background: var(--good-soft); border-radius: var(--radius); padding: 14px 16px; display: flex; flex-direction: column; gap: 10px; }
a.tag { text-decoration: none; }
a.tag:hover { text-decoration: underline; }

.write-grid { display: grid; grid-template-columns: minmax(0, 1fr); gap: 12px; }
.write-grid label { font-family: var(--serif); font-weight: 700; font-size: 0.98rem; display: flex; flex-direction: column; gap: 6px; }
.write-grid label span { font-family: var(--sans); font-weight: 400; font-size: 0.85rem; color: var(--muted); }
.write-grid textarea { min-height: 90px; font-family: var(--sans); font-weight: 400; }
.rubric { display: flex; flex-direction: column; gap: 6px; }
.rubric label { display: flex; gap: 10px; align-items: flex-start; font-size: 0.93rem; cursor: pointer; }
.rubric input { margin-top: 5px; accent-color: var(--good); }

.toast {
  position: fixed;
  left: 50%;
  bottom: calc(18px + env(safe-area-inset-bottom, 0px));
  transform: translateX(-50%);
  background: var(--ink);
  color: var(--paper);
  padding: 8px 16px;
  border-radius: 4px;
  font-size: 0.88rem;
  z-index: 50;
}

footer.site {
  max-width: 1120px;
  margin: 0 auto;
  padding: 24px 16px 48px;
  font-size: 0.82rem;
  color: var(--muted);
  border-top: 1px solid var(--rule);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; }
}