/* ===================================================================
   量子力学期末复习 · 样式表
   清爽护眼 · 支持浅色/深色 · 响应式
=================================================================== */

:root {
  --bg: #f4f6fb;
  --surface: #ffffff;
  --surface-2: #f0f2f9;
  --border: #e3e7f0;
  --text: #1f2433;
  --text-soft: #5a6275;
  --text-faint: #8b93a7;
  --primary: #5b54e6;
  --primary-soft: #ece9ff;
  --primary-ink: #4038c7;
  --accent: #0ea5a4;
  --success: #16a34a;
  --success-soft: #e4f6ea;
  --danger: #e1463a;
  --danger-soft: #fdeceb;
  --warn: #d98a00;
  --warn-soft: #fdf3dd;
  --shadow: 0 1px 3px rgba(20,25,55,.06), 0 6px 24px rgba(20,25,55,.06);
  --shadow-lg: 0 8px 40px rgba(20,25,55,.13);
  --radius: 14px;
  --radius-sm: 9px;
  --sidebar-w: 264px;
  --maxw: 880px;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
          "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", "Source Han Sans SC", sans-serif;
}

html[data-theme="dark"] {
  --bg: #0e1020;
  --surface: #181b2e;
  --surface-2: #1f2338;
  --border: #2c3150;
  --text: #e7e9f3;
  --text-soft: #b3b9d0;
  --text-faint: #7b82a0;
  --primary: #8b85ff;
  --primary-soft: #262a52;
  --primary-ink: #b3aeff;
  --accent: #2dd4bf;
  --success: #4ade80;
  --success-soft: #16361f;
  --danger: #f87171;
  --danger-soft: #3a1c1c;
  --warn: #fbbf24;
  --warn-soft: #3a2f10;
  --shadow: 0 1px 3px rgba(0,0,0,.3), 0 6px 24px rgba(0,0,0,.35);
  --shadow-lg: 0 8px 40px rgba(0,0,0,.5);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.75;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* ---------- 布局 ---------- */
.layout { display: flex; min-height: 100vh; }

.sidebar {
  width: var(--sidebar-w);
  flex: 0 0 var(--sidebar-w);
  background: var(--surface);
  border-right: 1px solid var(--border);
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  z-index: 40;
  display: flex;
  flex-direction: column;
}

.sidebar-brand {
  padding: 20px 20px 14px;
  display: flex;
  align-items: center;
  gap: 11px;
  border-bottom: 1px solid var(--border);
}
.brand-logo {
  width: 38px; height: 38px; border-radius: 11px; flex: 0 0 38px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: grid; place-items: center; color: #fff; font-size: 21px;
  box-shadow: 0 4px 14px rgba(91,84,230,.35);
}
.brand-text b { display: block; font-size: 15px; letter-spacing: .3px; }
.brand-text span { font-size: 12px; color: var(--text-faint); }

.nav { padding: 12px 12px 20px; flex: 1; }
.nav-section-label {
  font-size: 11px; font-weight: 700; letter-spacing: 1px;
  color: var(--text-faint); text-transform: uppercase;
  padding: 14px 12px 6px;
}
.nav a {
  display: flex; align-items: center; gap: 10px;
  padding: 9px 12px; margin: 2px 0;
  border-radius: var(--radius-sm);
  color: var(--text-soft); text-decoration: none;
  font-size: 14.5px; font-weight: 500;
  transition: background .15s, color .15s;
  position: relative;
}
.nav a:hover { background: var(--surface-2); color: var(--text); }
.nav a.active { background: var(--primary-soft); color: var(--primary-ink); font-weight: 600; }
.nav a.active::before {
  content:""; position:absolute; left:0; top:9px; bottom:9px; width:3px;
  border-radius: 2px; background: var(--primary);
}
.nav .nav-num {
  flex: 0 0 24px; height: 24px; border-radius: 7px;
  display: grid; place-items: center; font-size: 12px; font-weight: 700;
  background: var(--surface-2); color: var(--text-faint);
}
.nav a.active .nav-num { background: var(--primary); color: #fff; }
.nav .nav-label { flex: 1; }
.nav .nav-badge {
  font-size: 11px; font-weight: 700; padding: 1px 7px; border-radius: 10px;
  background: var(--success-soft); color: var(--success);
}
.nav .nav-badge.partial { background: var(--warn-soft); color: var(--warn); }

/* ---------- 主区 ---------- */
.main { flex: 1; min-width: 0; display: flex; flex-direction: column; }

.topbar {
  position: sticky; top: 0; z-index: 30;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center; gap: 14px;
  padding: 11px 26px;
}
.topbar .menu-btn {
  display: none; background: none; border: 1px solid var(--border);
  border-radius: 9px; width: 38px; height: 38px; font-size: 18px;
  color: var(--text); cursor: pointer;
}
.topbar .crumb { font-size: 14px; color: var(--text-faint); flex: 1; }
.topbar .crumb b { color: var(--text); }

.countdown {
  display: flex; align-items: center; gap: 8px;
  font-size: 13px; font-weight: 600; color: var(--danger);
  background: var(--danger-soft); padding: 6px 13px; border-radius: 20px;
}
.countdown .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--danger); animation: pulse 1.6s infinite; }
@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:.35} }

.theme-toggle {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 9px; width: 38px; height: 38px; cursor: pointer;
  font-size: 17px; color: var(--text); display: grid; place-items: center;
  transition: background .15s;
}
.theme-toggle:hover { background: var(--surface-2); }

.content { padding: 32px 26px 90px; width: 100%; }
.content-inner { max-width: var(--maxw); margin: 0 auto; }

/* ---------- 文字排版 ---------- */
.page-head { margin-bottom: 26px; }
.page-head .eyebrow {
  font-size: 12.5px; font-weight: 700; letter-spacing: 1.5px;
  color: var(--primary); text-transform: uppercase;
}
.page-head h1 { font-size: 30px; margin: 6px 0 8px; letter-spacing: .3px; line-height: 1.3; }
.page-head .lead { font-size: 16px; color: var(--text-soft); margin: 0; }

.content h2 {
  font-size: 22px; margin: 38px 0 14px; padding-bottom: 8px;
  border-bottom: 2px solid var(--border); scroll-margin-top: 80px;
}
.content h3 { font-size: 18px; margin: 26px 0 10px; color: var(--text); }
.content h4 { font-size: 15.5px; margin: 18px 0 8px; color: var(--primary-ink); }
.content p { margin: 11px 0; }
.content ul, .content ol { margin: 11px 0; padding-left: 24px; }
.content li { margin: 5px 0; }
.content a { color: var(--primary); }
.content strong { color: var(--text); font-weight: 700; }
.content em { color: var(--accent); font-style: normal; font-weight: 600; }

mjx-container { overflow-x: auto; overflow-y: hidden; max-width: 100%; }
mjx-container[display="true"] { margin: 14px 0 !important; }

/* ---------- 卡片 ---------- */
.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 22px 24px; margin: 18px 0;
  box-shadow: var(--shadow);
}
.card.flush { padding: 0; overflow: hidden; }

.callout {
  border-radius: var(--radius); padding: 14px 18px; margin: 16px 0;
  border-left: 4px solid var(--primary);
  background: var(--primary-soft);
  font-size: 15px;
}
.callout .callout-title { font-weight: 700; margin-bottom: 4px; display: flex; align-items: center; gap: 7px; }
.callout p:first-child { margin-top: 0; }
.callout p:last-child { margin-bottom: 0; }
.callout.tip { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 10%, var(--surface)); }
.callout.warn { border-color: var(--warn); background: var(--warn-soft); }
.callout.key { border-color: var(--danger); background: var(--danger-soft); }
.callout.analogy { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 9%, var(--surface)); }

/* 公式重点框 */
.formula-box {
  background: var(--surface-2); border: 1px dashed var(--border);
  border-radius: var(--radius-sm); padding: 6px 18px; margin: 16px 0;
  position: relative;
}
.formula-box .formula-tag {
  position: absolute; top: -10px; left: 14px;
  background: var(--primary); color: #fff; font-size: 11px; font-weight: 700;
  padding: 2px 9px; border-radius: 10px;
}

/* ---------- 知识点折叠 ---------- */
details.concept {
  border: 1px solid var(--border); border-radius: var(--radius);
  margin: 14px 0; background: var(--surface); overflow: hidden;
  box-shadow: var(--shadow);
}
details.concept > summary {
  list-style: none; cursor: pointer; padding: 16px 20px;
  font-size: 17px; font-weight: 650; display: flex; align-items: center; gap: 12px;
  transition: background .15s;
}
details.concept > summary::-webkit-details-marker { display: none; }
details.concept > summary:hover { background: var(--surface-2); }
details.concept > summary .chev { margin-left: auto; transition: transform .2s; color: var(--text-faint); }
details.concept[open] > summary .chev { transform: rotate(90deg); }
details.concept > summary .ico {
  width: 30px; height: 30px; border-radius: 9px; flex:0 0 30px;
  display: grid; place-items: center; font-size: 16px;
  background: var(--primary-soft); color: var(--primary-ink);
}
details.concept .concept-body { padding: 4px 20px 18px; border-top: 1px solid var(--border); }

/* ---------- 例题 ---------- */
.example {
  border: 1px solid var(--border); border-radius: var(--radius);
  margin: 22px 0; background: var(--surface); box-shadow: var(--shadow); overflow: hidden;
}
.example-head {
  padding: 15px 20px; background: var(--surface-2);
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
  border-bottom: 1px solid var(--border);
}
.example-head .ex-no {
  font-weight: 700; color: var(--primary-ink); font-size: 15px;
}
.example-head .ex-title { font-weight: 650; font-size: 15.5px; flex: 1 1 auto; }
.tag {
  font-size: 11.5px; font-weight: 600; padding: 2px 9px; border-radius: 20px;
  background: var(--primary-soft); color: var(--primary-ink);
}
.tag.src { background: var(--surface); border: 1px solid var(--border); color: var(--text-faint); }
.tag.calc { background: var(--warn-soft); color: var(--warn); }
.tag.proof { background: color-mix(in srgb, var(--accent) 14%, var(--surface)); color: var(--accent); }
.example-body { padding: 18px 20px; }
.problem-stmt {
  background: var(--surface-2); border-radius: var(--radius-sm);
  padding: 12px 16px; margin-bottom: 8px; font-size: 15.5px;
}
.problem-stmt .lbl { font-weight: 700; color: var(--text); margin-right: 6px; }

.solution-toggle {
  margin-top: 12px;
  background: var(--primary); color: #fff; border: none;
  padding: 9px 18px; border-radius: 9px; font-size: 14px; font-weight: 600;
  cursor: pointer; font-family: var(--sans); transition: filter .15s;
}
.solution-toggle:hover { filter: brightness(1.07); }
.solution { display: none; margin-top: 14px; }
.solution.show { display: block; animation: fade .3s; }
@keyframes fade { from{opacity:0; transform: translateY(-4px)} to{opacity:1; transform:none} }

.step { display: flex; gap: 13px; margin: 14px 0; }
.step .step-n {
  flex: 0 0 28px; height: 28px; border-radius: 50%;
  background: var(--primary); color: #fff; font-weight: 700; font-size: 13px;
  display: grid; place-items: center; margin-top: 2px;
}
.step .step-c { flex: 1; min-width: 0; }
.step .step-c h5 { margin: 2px 0 6px; font-size: 15px; color: var(--primary-ink); }
.step .step-c p { margin: 6px 0; }

.answer-final {
  margin-top: 14px; border-radius: var(--radius-sm);
  background: var(--success-soft); border: 1px solid color-mix(in srgb, var(--success) 30%, transparent);
  padding: 12px 16px;
}
.answer-final .lbl { color: var(--success); font-weight: 700; margin-right: 6px; }

/* ---------- 测验 ---------- */
.quiz-toolbar {
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
  margin: 14px 0 18px; padding: 14px 18px;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow);
}
.quiz-toolbar .qstat { font-size: 14px; color: var(--text-soft); }
.quiz-toolbar .qstat b { color: var(--text); font-size: 16px; }
.quiz-toolbar .spacer { flex: 1; }
.btn {
  background: var(--surface-2); color: var(--text); border: 1px solid var(--border);
  padding: 7px 15px; border-radius: 9px; font-size: 13.5px; font-weight: 600;
  cursor: pointer; font-family: var(--sans); transition: all .15s;
}
.btn:hover { background: var(--border); }
.btn.primary { background: var(--primary); color: #fff; border-color: var(--primary); }
.btn.primary:hover { filter: brightness(1.07); }
.btn.ghost { background: transparent; }
.btn.active { background: var(--primary); color:#fff; border-color: var(--primary); }

.quiz-item {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px 22px; margin: 16px 0;
  box-shadow: var(--shadow);
}
.quiz-item.hidden { display: none; }
.q-meta { display: flex; align-items: center; gap: 9px; margin-bottom: 10px; }
.q-index { font-weight: 700; color: var(--primary-ink); font-size: 14px; }
.q-type {
  font-size: 11px; font-weight: 700; padding: 2px 8px; border-radius: 20px;
  background: var(--surface-2); color: var(--text-faint);
}
.q-type.multiple { background: var(--warn-soft); color: var(--warn); }
.q-type.judge { background: color-mix(in srgb, var(--accent) 14%, var(--surface)); color: var(--accent); }
.q-done { margin-left:auto; font-size:12px; font-weight:700; display:none; }
.quiz-item.answered.correct .q-done { display:inline; color: var(--success); }
.quiz-item.answered.wrong .q-done { display:inline; color: var(--danger); }

.q-stem { font-size: 16px; font-weight: 550; margin-bottom: 14px; }
.q-options { list-style: none; margin: 0; padding: 0; }
.q-options li {
  border: 1.5px solid var(--border); border-radius: 10px;
  padding: 11px 15px; margin: 8px 0; cursor: pointer;
  display: flex; align-items: flex-start; gap: 11px;
  transition: border-color .15s, background .15s;
  font-size: 15px;
}
.q-options li:hover { border-color: var(--primary); background: var(--primary-soft); }
.q-options li .opt-key {
  flex: 0 0 24px; height: 24px; border-radius: 7px;
  border: 1.5px solid var(--border); display: grid; place-items: center;
  font-size: 13px; font-weight: 700; color: var(--text-soft); background: var(--surface);
}
.q-options li.selected { border-color: var(--primary); background: var(--primary-soft); }
.q-options li.selected .opt-key { background: var(--primary); color: #fff; border-color: var(--primary); }
.q-options li .opt-text { flex: 1; padding-top: 1px; }

/* 判定后 */
.quiz-item.answered .q-options li { cursor: default; }
.quiz-item.answered .q-options li:hover { background: var(--surface); }
.q-options li.is-correct { border-color: var(--success); background: var(--success-soft); }
.q-options li.is-correct:hover { background: var(--success-soft); }
.q-options li.is-correct .opt-key { background: var(--success); color: #fff; border-color: var(--success); }
.q-options li.is-wrong { border-color: var(--danger); background: var(--danger-soft); }
.q-options li.is-wrong:hover { background: var(--danger-soft); }
.q-options li.is-wrong .opt-key { background: var(--danger); color: #fff; border-color: var(--danger); }
.q-options li .mark { margin-left: auto; font-weight: 700; }

.q-actions { margin-top: 14px; display: flex; gap: 10px; align-items: center; }
.q-explain {
  display: none; margin-top: 14px; padding: 13px 16px;
  border-radius: var(--radius-sm); background: var(--surface-2);
  border-left: 4px solid var(--accent); font-size: 14.5px;
}
.quiz-item.answered .q-explain { display: block; animation: fade .3s; }
.q-explain .lbl { font-weight: 700; color: var(--accent); margin-right: 6px; }

/* 子标签页 */
.tabs { display: flex; gap: 6px; margin: 4px 0 22px; border-bottom: 1px solid var(--border); flex-wrap: wrap; }
.tabs button {
  background: none; border: none; padding: 11px 16px; cursor: pointer;
  font-size: 15px; font-weight: 600; color: var(--text-faint);
  border-bottom: 2.5px solid transparent; font-family: var(--sans);
  margin-bottom: -1px; transition: color .15s;
}
.tabs button:hover { color: var(--text); }
.tabs button.active { color: var(--primary); border-bottom-color: var(--primary); }
.tab-panel { display: none; }
.tab-panel.active { display: block; animation: fade .25s; }

/* ---------- 首页 ---------- */
.hero {
  background: linear-gradient(135deg, var(--primary), #7c5cff 60%, var(--accent));
  border-radius: 20px; padding: 34px 34px; color: #fff; margin-bottom: 26px;
  box-shadow: var(--shadow-lg); position: relative; overflow: hidden;
}
.hero::after {
  content:""; position:absolute; right:-60px; top:-60px; width:240px; height:240px;
  background: radial-gradient(circle, rgba(255,255,255,.18), transparent 70%);
}
.hero h1 { font-size: 30px; margin: 0 0 8px; position: relative; }
.hero p { font-size: 15.5px; opacity: .92; margin: 0; max-width: 560px; position: relative; }
.hero .hero-meta { display: flex; gap: 22px; margin-top: 20px; flex-wrap: wrap; position: relative; }
.hero .hero-meta div b { display: block; font-size: 24px; }
.hero .hero-meta div span { font-size: 12.5px; opacity: .85; }

.grid { display: grid; gap: 16px; }
.grid.cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid.cols-3 { grid-template-columns: repeat(3, 1fr); }

.ch-card {
  display: block; text-decoration: none; color: inherit;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 18px 20px; box-shadow: var(--shadow);
  transition: transform .15s, box-shadow .15s, border-color .15s;
}
.ch-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); border-color: var(--primary); }
.ch-card .ch-top { display: flex; align-items: center; gap: 11px; margin-bottom: 9px; }
.ch-card .ch-icon {
  width: 40px; height: 40px; border-radius: 11px; flex: 0 0 40px;
  background: var(--primary-soft); color: var(--primary-ink);
  display: grid; place-items: center; font-size: 20px; font-weight: 700;
}
.ch-card h3 { margin: 0; font-size: 16.5px; }
.ch-card .ch-sub { font-size: 13px; color: var(--text-faint); }
.ch-card .ch-desc { font-size: 13.5px; color: var(--text-soft); margin: 6px 0 12px; min-height: 38px; }
.ch-card .ch-foot { display: flex; align-items: center; gap: 8px; font-size: 12.5px; color: var(--text-faint); }

.progress-bar { height: 7px; background: var(--surface-2); border-radius: 5px; overflow: hidden; flex: 1; }
.progress-bar > i { display: block; height: 100%; background: linear-gradient(90deg, var(--primary), var(--accent)); border-radius: 5px; transition: width .5s; }

.stat-row { display: flex; gap: 16px; flex-wrap: wrap; }
.stat-box {
  flex: 1 1 150px; background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 18px 20px; box-shadow: var(--shadow);
}
.stat-box .sb-val { font-size: 30px; font-weight: 800; color: var(--primary); line-height: 1.1; }
.stat-box .sb-lbl { font-size: 13px; color: var(--text-faint); margin-top: 3px; }

.roadmap { counter-reset: rm; }
.roadmap .rm-item { display: flex; gap: 14px; padding: 12px 0; border-bottom: 1px dashed var(--border); }
.roadmap .rm-item:last-child { border-bottom: none; }
.roadmap .rm-day {
  flex: 0 0 78px; font-weight: 700; color: var(--primary-ink); font-size: 14px;
}
.roadmap .rm-task { flex: 1; }
.roadmap .rm-task b { font-size: 15px; }
.roadmap .rm-task p { margin: 3px 0 0; font-size: 13.5px; color: var(--text-soft); }

/* 表格 */
.tbl-wrap { overflow-x: auto; margin: 16px 0; }
table.qm {
  width: 100%; border-collapse: collapse; font-size: 14.5px;
  background: var(--surface); border-radius: var(--radius); overflow: hidden;
  box-shadow: var(--shadow);
}
table.qm th, table.qm td { padding: 10px 14px; text-align: left; border-bottom: 1px solid var(--border); }
table.qm th { background: var(--surface-2); font-weight: 700; font-size: 13.5px; }
table.qm tr:last-child td { border-bottom: none; }
table.qm td:first-child { font-weight: 600; }

.toast {
  position: fixed; bottom: 26px; left: 50%; transform: translateX(-50%) translateY(20px);
  background: var(--text); color: var(--bg); padding: 11px 22px; border-radius: 24px;
  font-size: 14px; font-weight: 600; box-shadow: var(--shadow-lg);
  opacity: 0; pointer-events: none; transition: all .3s; z-index: 100;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

.scrim {
  display: none; position: fixed; inset: 0; background: rgba(10,12,25,.5);
  z-index: 39;
}
.scrim.show { display: block; }

.foot-note {
  margin-top: 50px; padding-top: 18px; border-top: 1px solid var(--border);
  font-size: 13px; color: var(--text-faint); text-align: center;
}

/* 上一章/下一章 */
.pager { display: flex; justify-content: space-between; gap: 14px; margin-top: 40px; }
.pager a {
  flex: 1; text-decoration: none; color: inherit;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 14px 18px; box-shadow: var(--shadow); transition: border-color .15s, transform .15s;
}
.pager a:hover { border-color: var(--primary); transform: translateY(-2px); }
.pager a span { font-size: 12px; color: var(--text-faint); }
.pager a b { display: block; font-size: 15px; margin-top: 2px; }
.pager a.next { text-align: right; }
.pager a.disabled { visibility: hidden; }

/* ---------- 响应式 ---------- */
@media (max-width: 920px) {
  .grid.cols-3 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 780px) {
  :root { --sidebar-w: 280px; }
  .sidebar {
    position: fixed; left: 0; top: 0; transform: translateX(-100%);
    transition: transform .25s; box-shadow: var(--shadow-lg);
  }
  .sidebar.open { transform: translateX(0); }
  .topbar .menu-btn { display: grid; place-items: center; }
  .content { padding: 22px 16px 80px; }
  .grid.cols-2, .grid.cols-3 { grid-template-columns: 1fr; }
  .hero { padding: 26px 22px; }
  .hero h1 { font-size: 24px; }
  .page-head h1 { font-size: 25px; }
  .countdown .cd-label { display: none; }
}

@media print {
  .sidebar, .topbar, .solution-toggle, .quiz-toolbar, .q-actions, .theme-toggle, .pager { display: none !important; }
  .solution { display: block !important; }
  .q-explain { display: block !important; }
  .card, .example, .quiz-item { box-shadow: none; break-inside: avoid; }
}