/* 408 背诵 · 全部样式
 * 目标设备：平板（横屏为主）+ 手机竖屏；支持深色模式。
 * 颜色走 CSS 变量，方便以后换主题。
 */

:root {
  --brand: #0E7C66;
  --brand-2: #12A88A;
  --brand-grad: linear-gradient(135deg, #0E7C66, #12A88A);
  --bg: #F4F6F8;
  --bg-elev: #FFFFFF;
  --text: #17211E;
  --text-dim: #5C6B66;
  --text-faint: #8A9893;
  --line: #E2E8E6;
  --ok: #16A34A;
  --warn: #D97706;
  --bad: #DC2626;
  --radius: 14px;
  --radius-s: 10px;
  --shadow: 0 1px 3px rgba(16, 32, 28, .07), 0 6px 18px rgba(16, 32, 28, .05);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", "PingFang SC", sans-serif;
}

html[data-theme="dark"] {
  --brand: #2DD4A8;
  --brand-2: #14B88F;
  --brand-grad: linear-gradient(135deg, #0B5A4A, #12876C);
  --bg: #0B1210;
  --bg-elev: #141C1A;
  --text: #E8EFEC;
  --text-dim: #9FB0AA;
  --text-faint: #6B7C76;
  --line: #24302C;
  --ok: #4ADE80;
  --warn: #FBBF24;
  --bad: #F87171;
  --shadow: 0 1px 3px rgba(0, 0, 0, .4), 0 6px 18px rgba(0, 0, 0, .3);
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

html, body {
  margin: 0; padding: 0;
  background: var(--bg); color: var(--text);
  font-family: var(--font);
  font-size: 16px; line-height: 1.6;
  -webkit-text-size-adjust: 100%;
}

[hidden] { display: none !important; }

/* ------------------------------- 启动占位 ------------------------------- */
.boot {
  position: fixed; inset: 0; z-index: 90;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 14px; background: var(--bg);
}
.boot-logo {
  width: 68px; height: 68px; border-radius: 20px;
  background: var(--brand-grad); color: #fff;
  display: grid; place-items: center; font-weight: 800; font-size: 24px;
  box-shadow: var(--shadow);
}
.boot-text { color: var(--text-dim); font-size: 14px; }

/* --------------------------------- 顶栏 -------------------------------- */
.topbar {
  position: sticky; top: 0; z-index: 40;
  display: flex; align-items: center; gap: 10px;
  padding: max(env(safe-area-inset-top), 10px) 14px 10px;
  background: color-mix(in srgb, var(--bg-elev) 86%, transparent);
  backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color .2s;
}
.topbar.scrolled { border-bottom-color: var(--line); }
.topbar-main { flex: 1; min-width: 0; }
.topbar h1 { margin: 0; font-size: 17px; font-weight: 700; letter-spacing: .2px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.topbar-sub { margin: 1px 0 0; font-size: 11.5px; color: var(--text-dim); }
.topbar-extra { display: flex; align-items: center; gap: 8px; }

.icon-btn {
  width: 38px; height: 38px; flex: none;
  display: grid; place-items: center;
  border: 1px solid var(--line); border-radius: 11px;
  background: var(--bg-elev); color: var(--text);
  cursor: pointer;
}
.icon-btn:active { transform: scale(.95); }

/* --------------------------------- 主区 -------------------------------- */
.view {
  padding: 14px 14px calc(84px + env(safe-area-inset-bottom));
  max-width: 1100px; margin: 0 auto;
}
.view.no-tabbar { padding-bottom: 28px; }

.sec-title {
  font-size: 12.5px; font-weight: 700; color: var(--text-dim);
  letter-spacing: .4px; margin: 20px 2px 10px;
}
.card {
  background: var(--bg-elev); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 14px; margin-bottom: 12px;
}

/* --------------------------------- 提示 -------------------------------- */
.toast {
  position: fixed; left: 50%; bottom: 96px; transform: translate(-50%, 12px);
  z-index: 80; max-width: 88vw;
  padding: 10px 16px; border-radius: 999px;
  background: rgba(20, 30, 27, .94); color: #fff; font-size: 13.5px;
  opacity: 0; transition: opacity .2s, transform .2s; pointer-events: none;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }
.toast.bad { background: var(--bad); }
.toast.ok { background: var(--ok); }

.overlay { position: fixed; inset: 0; z-index: 85; display: grid; place-items: center; background: rgba(0,0,0,.35); }
.overlay-card { background: var(--bg-elev); border-radius: var(--radius); padding: 22px 26px; text-align: center; }
.spinner {
  width: 26px; height: 26px; margin: 0 auto 10px;
  border: 3px solid var(--line); border-top-color: var(--brand);
  border-radius: 50%; animation: spin .8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.loading { display: flex; flex-direction: column; align-items: center; gap: 8px; padding: 60px 0; color: var(--text-dim); }
.empty { text-align: center; padding: 56px 20px; color: var(--text-dim); }
.empty .em { font-size: 44px; margin-bottom: 8px; }
.empty h3 { margin: 6px 0; color: var(--text); font-size: 17px; }

.notice {
  background: color-mix(in srgb, var(--brand) 8%, var(--bg-elev));
  border: 1px solid color-mix(in srgb, var(--brand) 22%, var(--line));
  border-radius: var(--radius-s); padding: 11px 13px;
  font-size: 13px; color: var(--text-dim); line-height: 1.65;
}
.notice.warn {
  background: color-mix(in srgb, var(--warn) 9%, var(--bg-elev));
  border-color: color-mix(in srgb, var(--warn) 26%, var(--line));
}

/* --------------------------------- 按钮 -------------------------------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  min-height: 42px; padding: 0 16px;
  border: 1px solid var(--line); border-radius: 11px;
  background: var(--bg-elev); color: var(--text);
  font: inherit; font-size: 14.5px; font-weight: 600;
  cursor: pointer; transition: transform .12s, filter .12s;
}
.btn:active { transform: scale(.97); }
.btn.primary { background: var(--brand-grad); color: #fff; border-color: transparent; }
.btn.ghost { background: transparent; }
.btn.small { min-height: 34px; padding: 0 12px; font-size: 13px; }
.btn:disabled { opacity: .45; cursor: default; }
.btn-row { display: flex; gap: 10px; flex-wrap: wrap; }
.btn-row .btn { flex: 1; min-width: 120px; }

.text-input {
  width: 100%; min-height: 40px; padding: 8px 12px;
  border: 1px solid var(--line); border-radius: 10px;
  background: var(--bg-elev); color: var(--text); font: inherit; font-size: 14px;
}
.text-input:focus { outline: 2px solid color-mix(in srgb, var(--brand) 40%, transparent); outline-offset: 1px; }

/* ------------------------------- 首页：概览 ------------------------------ */
.hero {
  display: flex; align-items: center; gap: 18px; flex-wrap: wrap;
  background: var(--bg-elev); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 18px; box-shadow: var(--shadow);
}
.ring {
  width: 92px; height: 92px; flex: none; border-radius: 50%;
  background: conic-gradient(var(--brand) var(--pct, 0%), var(--line) 0);
  display: grid; place-items: center;
}
.ring-in {
  width: 74px; height: 74px; border-radius: 50%;
  background: var(--bg-elev); display: grid; place-items: center; align-content: center;
}
.ring-n { font-size: 20px; font-weight: 800; line-height: 1; }
.ring-l { font-size: 10.5px; color: var(--text-dim); margin-top: 2px; }
.hero-info { flex: 1; min-width: 180px; }
.hero-row { display: flex; align-items: baseline; gap: 6px; flex-wrap: wrap; font-size: 13px; color: var(--text-dim); }
.hero-row b { font-size: 17px; color: var(--text); }
.hero-row span { margin-right: 8px; }
.hero-sub { font-size: 12.5px; color: var(--text-faint); margin-top: 6px; }
.hero-streak { font-size: 12.5px; color: var(--warn); margin-top: 4px; font-weight: 600; }
.hero-go { width: 100%; margin-top: 14px; }
/* 「随机刷卡」副按钮：主按钮是「今日复习」时它跟在下面，弱化成一条文字链接 */
.hero-alt { width: 100%; margin-top: 8px; }

/* ------------------------------ 首页：科目卡 ----------------------------- */
.subj-list { display: grid; gap: 10px; }
.subj-card {
  --c: var(--brand);
  display: flex; align-items: center; gap: 13px; width: 100%;
  padding: 14px; text-align: left; cursor: pointer;
  background: var(--bg-elev); color: var(--text);
  border: 1px solid var(--line); border-radius: var(--radius);
  font: inherit; transition: transform .12s;
}
.subj-card:active { transform: scale(.99); }
.subj-icon {
  width: 44px; height: 44px; flex: none; border-radius: 12px;
  display: grid; place-items: center; font-size: 19px; font-weight: 800;
  color: #fff; background: var(--c);
}
.subj-main { flex: 1; min-width: 0; }
.subj-name { display: block; font-size: 15.5px; font-weight: 700; }
.subj-meta { display: block; font-size: 12px; color: var(--text-dim); margin: 2px 0 7px; }
.bar { display: block; height: 5px; border-radius: 3px; background: var(--line); overflow: hidden; }
.bar-fill { display: block; height: 100%; background: var(--c); border-radius: 3px; transition: width .3s; }
.subj-pct { font-size: 13px; font-weight: 700; color: var(--text-dim); }

/* ------------------------------- 首页：快捷 ------------------------------ */
.quick-row { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; }
.quick {
  display: flex; align-items: center; gap: 10px;
  padding: 13px 14px; cursor: pointer; font: inherit; font-size: 14px; font-weight: 600;
  background: var(--bg-elev); color: var(--text);
  border: 1px solid var(--line); border-radius: var(--radius);
}
.quick-ic { font-size: 18px; }

/* ------------------------------- 章节列表 ------------------------------- */
.ch { margin-bottom: 10px; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; background: var(--bg-elev); }
.ch-head {
  display: flex; align-items: center; gap: 10px; width: 100%;
  padding: 13px 14px; cursor: pointer; font: inherit; text-align: left;
  background: transparent; color: var(--text); border: none;
}
.ch-name { flex: 1; font-weight: 700; font-size: 14.5px; }
.ch-meta { font-size: 12px; color: var(--text-dim); }
.ch-caret { color: var(--text-faint); transition: transform .18s; }
.ch-body { border-top: 1px solid var(--line); }
.pt-row {
  display: flex; align-items: center; gap: 10px; width: 100%;
  padding: 11px 14px; cursor: pointer; font: inherit; text-align: left;
  background: transparent; color: var(--text); border: none;
  border-bottom: 1px solid var(--line);
}
.pt-row:last-child { border-bottom: none; }
.pt-row.known { opacity: .62; }
.pt-dot { width: 9px; height: 9px; border-radius: 50%; flex: none; background: var(--line); }
.pt-dot[data-box="1"] { background: var(--bad); }
.pt-dot[data-box="2"] { background: var(--warn); }
.pt-dot[data-box="3"] { background: #3B82F6; }
.pt-dot[data-box="4"] { background: var(--brand-2); }
.pt-dot[data-box="5"] { background: var(--ok); }
.pt-q { flex: 1; font-size: 13.5px; line-height: 1.5; }
.pt-warn { font-size: 12px; }
.pt-box { font-size: 11px; color: var(--text-faint); white-space: nowrap; }

/* ------------------------------- 刷卡页 -------------------------------- */
.drill { max-width: 760px; margin: 0 auto; }
.drill-top { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; }
.drill-bar { flex: 1; height: 6px; border-radius: 3px; background: var(--line); overflow: hidden; }
.drill-fill { height: 100%; background: var(--brand-grad); border-radius: 3px; transition: width .25s; }
.drill-count { font-size: 12.5px; color: var(--text-dim); font-variant-numeric: tabular-nums; }

.drill-card-host { min-height: 300px; position: relative; }
.card-face {
  background: var(--bg-elev); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 22px 20px;
  box-shadow: var(--shadow); animation: pop .18s ease;
}
@keyframes pop { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

/* ---- 换卡的滑动动画 ----
 * 交互上最舒服的是「跟手」：往下一张走，旧卡从左边滑出、新卡从右边滑入；
 * 往回看则方向相反。旧卡用一张克隆留在原地做退场，动画结束就删掉。 */
.drill-card-host { overflow-x: clip; }   /* 卡片滑出边界时不要撑出横向滚动条 */

.card-slide-out-l { animation: slideOutL .26s cubic-bezier(.4, 0, .9, .4) forwards; position: absolute; inset: 0; pointer-events: none; }
.card-slide-out-r { animation: slideOutR .26s cubic-bezier(.4, 0, .9, .4) forwards; position: absolute; inset: 0; pointer-events: none; }
.card-slide-in-r  { animation: slideInR .28s cubic-bezier(.2, .8, .3, 1); }
.card-slide-in-l  { animation: slideInL .28s cubic-bezier(.2, .8, .3, 1); }

@keyframes slideOutL { from { opacity: 1; transform: none; } to { opacity: 0; transform: translateX(-28%) scale(.96); } }
@keyframes slideOutR { from { opacity: 1; transform: none; } to { opacity: 0; transform: translateX(28%) scale(.96); } }
@keyframes slideInR  { from { opacity: 0; transform: translateX(28%) scale(.97); } to { opacity: 1; transform: none; } }
@keyframes slideInL  { from { opacity: 0; transform: translateX(-28%) scale(.97); } to { opacity: 1; transform: none; } }

/* 翻面（正面 → 背面）用轻微的上下推移，跟左右换卡区分开 */
.card-flip-in { animation: flipIn .22s cubic-bezier(.2, .8, .3, 1); }
@keyframes flipIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }

/* 系统开了「减少动态效果」就全部关掉 */
@media (prefers-reduced-motion: reduce) {
  .card-slide-out-l, .card-slide-out-r, .card-slide-in-r, .card-slide-in-l, .card-flip-in { animation: none !important; }
}
.card-face.front { cursor: pointer; }
.card-tags { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 12px; }
.tag {
  --c: var(--brand);
  font-size: 11px; font-weight: 700; padding: 3px 9px; border-radius: 999px;
  color: var(--c); background: color-mix(in srgb, var(--c) 12%, transparent);
}
.tag.plain { color: var(--text-dim); background: color-mix(in srgb, var(--text-dim) 10%, transparent); }
.tag.mini { font-size: 10.5px; font-weight: 600; color: var(--text-dim); background: var(--bg); border: 1px solid var(--line); }
.tag-row { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 12px; }

.card-q { font-size: 21px; font-weight: 700; line-height: 1.5; letter-spacing: .2px; }
.card-q.small { font-size: 15px; font-weight: 650; color: var(--text-dim); padding-bottom: 10px; border-bottom: 1px dashed var(--line); margin-bottom: 12px; }
.card-a { font-size: 15px; line-height: 1.8; }
.card-tap { margin-top: 20px; font-size: 12.5px; color: var(--text-faint); text-align: center; }
.card-hist { margin-top: 14px; font-size: 11.5px; color: var(--text-faint); }

.md p { margin: 0 0 8px; }
.md .md-gap { height: 6px; }
.md ul { margin: 6px 0 10px; padding-left: 20px; }
.md li { margin: 3px 0; }
.md code { background: var(--bg); padding: 1px 5px; border-radius: 5px; font-size: .92em; border: 1px solid var(--line); }
.md strong { color: var(--brand); }
.md table { width: 100%; border-collapse: collapse; margin: 8px 0 12px; font-size: 13px; }
.md td { border: 1px solid var(--line); padding: 6px 8px; text-align: left; }
.md tr:first-child td { background: var(--bg); font-weight: 650; }

.trap, .mnemonic {
  display: flex; gap: 10px; margin-top: 14px; padding: 11px 13px;
  border-radius: var(--radius-s); font-size: 13.5px; line-height: 1.7;
}
.trap { background: color-mix(in srgb, var(--bad) 8%, var(--bg-elev)); border: 1px solid color-mix(in srgb, var(--bad) 22%, var(--line)); }
.mnemonic { background: color-mix(in srgb, var(--warn) 9%, var(--bg-elev)); border: 1px solid color-mix(in srgb, var(--warn) 24%, var(--line)); }
.trap-ic, .mn-ic { font-size: 15px; line-height: 1.4; }
.trap-body b, .mn-body b { display: block; font-size: 12px; margin-bottom: 3px; }
.trap-body b { color: var(--bad); }
.mn-body b { color: var(--warn); }

.grade-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-top: 14px; }
.grade {
  display: flex; flex-direction: column; align-items: center; gap: 2px;
  min-height: 62px; padding: 10px 6px; cursor: pointer; font: inherit;
  border-radius: var(--radius); border: 2px solid var(--line);
  background: var(--bg-elev); color: var(--text);
  transition: transform .12s;
}
.grade:active { transform: scale(.96); }
.grade:disabled { opacity: .4; }
.g-label { font-size: 15px; font-weight: 700; }
.g-sub { font-size: 10.5px; color: var(--text-dim); }
.grade.no { border-color: color-mix(in srgb, var(--bad) 45%, var(--line)); }
.grade.no .g-label { color: var(--bad); }
.grade.vague { border-color: color-mix(in srgb, var(--warn) 45%, var(--line)); }
.grade.vague .g-label { color: var(--warn); }
.grade.know { border-color: color-mix(in srgb, var(--ok) 45%, var(--line)); }
.grade.know .g-label { color: var(--ok); }

.drill-hint { text-align: center; font-size: 12px; color: var(--text-faint); margin-top: 12px; }

.drill-done { text-align: center; background: var(--bg-elev); border: 1px solid var(--line); border-radius: var(--radius); padding: 26px 20px; }
.done-em { font-size: 42px; }
.drill-done h3 { margin: 8px 0 16px; }
.done-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-bottom: 14px; }
.done-box { padding: 12px; border-radius: var(--radius-s); background: var(--bg); display: grid; gap: 2px; }
.done-box b { font-size: 20px; }
.done-box span { font-size: 11.5px; color: var(--text-dim); }
.done-box.ok b { color: var(--ok); }
.done-box.mid b { color: var(--warn); }
.done-box.bad b { color: var(--bad); }
.done-tip { font-size: 12.5px; color: var(--text-dim); margin-bottom: 16px; }
.done-streak {
  display: inline-block; margin-bottom: 12px; padding: 4px 12px;
  font-size: 12.5px; font-weight: 600; border-radius: 20px;
  background: color-mix(in srgb, var(--warn) 14%, transparent); color: var(--warn);
}

/* ------------------------------- 易错本 -------------------------------- */
.wrong-card { background: var(--bg-elev); border: 1px solid var(--line); border-radius: var(--radius); margin-bottom: 10px; overflow: hidden; }
.wrong-card.open { border-color: color-mix(in srgb, var(--bad) 30%, var(--line)); }
.wc-head {
  display: flex; align-items: center; gap: 10px; width: 100%;
  padding: 12px 14px; cursor: pointer; font: inherit; text-align: left;
  background: transparent; color: var(--text); border: none;
}
.wc-tag {
  --c: var(--brand);
  font-size: 10.5px; font-weight: 700; padding: 2px 8px; border-radius: 999px;
  color: #fff; background: var(--c); flex: none;
}
.wc-q { flex: 1; font-size: 13.5px; line-height: 1.5; }
.wc-count { font-size: 11px; color: var(--bad); font-weight: 700; white-space: nowrap; }
.wc-body { padding: 0 14px 14px; border-top: 1px solid var(--line); }
.wc-body .card-a { padding-top: 12px; }
.wc-meta { font-size: 11.5px; color: var(--text-faint); margin: 10px 0; }

/* ------------------------------- 可视化 -------------------------------- */
.viz-list { display: grid; gap: 10px; }
.viz-card {
  display: grid; gap: 3px; padding: 14px; cursor: pointer; font: inherit; text-align: left;
  background: var(--bg-elev); color: var(--text);
  border: 1px solid var(--line); border-radius: var(--radius);
}
.viz-name { font-size: 15px; font-weight: 700; }
.viz-desc { font-size: 12.5px; color: var(--text-dim); }
.viz-sub { font-size: 13px; color: var(--text-dim); margin: 0 2px 12px; }

.viz-ctrl { display: grid; gap: 10px; margin-bottom: 14px; }
.viz-ctrl.row { display: flex; flex-wrap: wrap; align-items: flex-end; gap: 8px; }
.viz-field { display: grid; gap: 4px; font-size: 12px; color: var(--text-dim); }
.viz-field.small { max-width: 130px; }

.pr-table { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); background: var(--bg-elev); -webkit-overflow-scrolling: touch; }
.pr-row { display: flex; align-items: stretch; border-bottom: 1px solid var(--line); }
.pr-row:last-child { border-bottom: none; }
.pr-row.head { background: var(--bg); font-weight: 700; }
.pr-cell { min-width: 34px; padding: 7px 4px; text-align: center; font-size: 12.5px; font-variant-numeric: tabular-nums; border-right: 1px solid var(--line); }
.pr-cell.label { min-width: 92px; text-align: left; padding-left: 10px; font-weight: 650; position: sticky; left: 0; background: var(--bg-elev); z-index: 1; }
.pr-row.head .pr-cell.label { background: var(--bg); }
.pr-cell.hitbox.hit { color: var(--ok); background: color-mix(in srgb, var(--ok) 12%, transparent); }
.pr-cell.hitbox.fault { color: var(--bad); background: color-mix(in srgb, var(--bad) 12%, transparent); }
.pr-cell.now { outline: 2px solid var(--brand); outline-offset: -2px; }
.pr-cell.fault { min-width: 52px; font-weight: 700; }

.pr-summary { display: grid; gap: 8px; margin: 14px 0; }
.pr-sum { display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap; padding: 10px 12px; border-radius: var(--radius-s); background: var(--bg-elev); border: 1px solid var(--line); font-size: 13px; }
.pr-sum.best { border-color: color-mix(in srgb, var(--ok) 40%, var(--line)); background: color-mix(in srgb, var(--ok) 7%, var(--bg-elev)); }
.pr-sum b { font-size: 14px; }
.pr-sum .dim { color: var(--text-dim); font-size: 12px; }
.pr-sum .dim.small { font-size: 11px; }

.pr-mem { display: grid; gap: 10px; margin-bottom: 14px; }
.pr-mem-title { font-size: 13px; font-weight: 700; }
.pr-mem-box { display: flex; align-items: center; gap: 12px; padding: 10px 12px; background: var(--bg-elev); border: 1px solid var(--line); border-radius: var(--radius-s); flex-wrap: wrap; }
.pr-mem-name { font-size: 12.5px; font-weight: 700; min-width: 44px; }
.pr-frames { display: flex; gap: 6px; }
.pr-frame {
  width: 40px; height: 40px; display: grid; place-items: center;
  border-radius: 9px; border: 1px solid var(--line); background: var(--bg);
  font-size: 14px; font-weight: 700; font-variant-numeric: tabular-nums;
}
.pr-frame.empty { color: var(--text-faint); }
.pr-state { font-size: 12px; font-weight: 700; }
.pr-state.ok { color: var(--ok); }
.pr-state.bad { color: var(--bad); }

/* ------------------------------- 设置页 -------------------------------- */
.set-row { display: flex; align-items: center; gap: 12px; padding: 11px 0; border-bottom: 1px solid var(--line); }
.set-row:last-child { border-bottom: none; }
.set-main { flex: 1; min-width: 0; }
.set-title { display: block; font-size: 14.5px; font-weight: 650; }
.set-desc { display: block; font-size: 12px; color: var(--text-dim); margin-top: 2px; }
.switch { position: relative; width: 48px; height: 28px; flex: none; }
.switch input { position: absolute; opacity: 0; width: 100%; height: 100%; margin: 0; cursor: pointer; }
.switch .slider { position: absolute; inset: 0; border-radius: 999px; background: var(--line); transition: background .2s; pointer-events: none; }
.switch .slider::after {
  content: ''; position: absolute; top: 3px; left: 3px; width: 22px; height: 22px;
  border-radius: 50%; background: #fff; transition: transform .2s; box-shadow: 0 1px 3px rgba(0,0,0,.2);
}
.switch input:checked + .slider { background: var(--brand); }
.switch input:checked + .slider::after { transform: translateX(20px); }

.seg { display: flex; gap: 4px; padding: 3px; background: var(--bg); border-radius: 10px; border: 1px solid var(--line); }
.seg-btn {
  min-height: 32px; padding: 0 12px; border: none; border-radius: 8px;
  background: transparent; color: var(--text-dim); font: inherit; font-size: 13px; cursor: pointer;
}
.seg-btn.on { background: var(--bg-elev); color: var(--text); font-weight: 700; box-shadow: var(--shadow); }

/* --------------------------------- 标签栏 ------------------------------- */
.tabbar {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 50;
  display: flex; justify-content: space-around;
  padding: 6px 0 max(env(safe-area-inset-bottom), 6px);
  background: color-mix(in srgb, var(--bg-elev) 92%, transparent);
  backdrop-filter: saturate(180%) blur(14px);
  border-top: 1px solid var(--line);
}
.tab {
  flex: 1; display: flex; flex-direction: column; align-items: center; gap: 2px;
  padding: 4px 0; border: none; background: transparent; cursor: pointer;
  color: var(--text-faint); font: inherit; font-size: 10.5px;
}
.tab svg { width: 22px; height: 22px; }
.tab.on { color: var(--brand); font-weight: 700; }

/* ------------------------------- 平板/横屏 ------------------------------ */
@media (min-width: 820px) {
  .view { padding: 18px 22px 96px; }
  .card-q { font-size: 23px; }
  .subj-list { grid-template-columns: repeat(2, 1fr); }
  .quick-row { grid-template-columns: repeat(4, 1fr); }
  .viz-list { grid-template-columns: repeat(2, 1fr); }
  .grade-row { gap: 14px; }
  .grade { min-height: 72px; }
  .pr-boards, .pr-summary { max-width: 100%; }
}

/* 横屏矮屏：刷卡页压缩留白，保证卡片和按钮同屏 */
@media (orientation: landscape) and (max-height: 560px) {
  .drill-card-host { min-height: 200px; }
  .card-face { padding: 16px; }
  .card-q { font-size: 18px; }
  .grade { min-height: 54px; }
  .drill-hint { margin-top: 8px; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: .001ms !important; transition-duration: .001ms !important; }
}

/* 离线提示条 */
.offline-bar {
  position: fixed; left: 50%; transform: translateX(-50%);
  bottom: calc(58px + env(safe-area-inset-bottom, 0px));
  z-index: 90; max-width: calc(100% - 24px);
  padding: 8px 14px; border-radius: 20px; font-size: 12px; line-height: 1.5;
  background: color-mix(in srgb, var(--warn) 16%, var(--bg-elev));
  border: 1px solid color-mix(in srgb, var(--warn) 35%, var(--line));
  color: var(--text); box-shadow: var(--shadow);
}

/* ===== 新手引导（只在完全没学过时出现）===== */
.guide {
  margin: 4px 0 20px; padding: 16px;
  background: var(--bg-elev); border: 1px solid var(--line);
  border-radius: var(--radius); box-shadow: var(--shadow);
}
.guide-title { font-size: 14px; font-weight: 700; margin-bottom: 14px; }
.guide-steps { display: grid; gap: 12px; }
.guide-step { display: flex; gap: 10px; align-items: flex-start; }
.gs-n {
  flex: none; width: 20px; height: 20px; border-radius: 50%; margin-top: 1px;
  display: grid; place-items: center; font-size: 11px; font-weight: 700;
  background: var(--brand-grad); color: #fff;
}
.gs-body { display: grid; gap: 2px; }
.gs-body b { font-size: 12.5px; }
.gs-body span { font-size: 12px; color: var(--text-dim); line-height: 1.6; }
.guide-go { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 16px; }

/* ===== 学习统计页 ===== */
.st-overview { display: grid; grid-template-columns: repeat(auto-fit, minmax(76px, 1fr)); gap: 10px; margin-bottom: 18px; }
.st-box {
  padding: 12px 10px; text-align: center;
  background: var(--bg-elev); border: 1px solid var(--line); border-radius: var(--radius-s);
}
.st-n { font-size: 21px; font-weight: 800; font-variant-numeric: tabular-nums; line-height: 1.2; }
.st-l { font-size: 11px; color: var(--text-faint); margin-top: 3px; }

.st-chart { display: flex; align-items: flex-end; gap: 4px; height: 150px; padding-top: 16px; }
.st-col { flex: 1; display: flex; flex-direction: column; align-items: center; height: 100%; min-width: 0; }
.st-bar-wrap { flex: 1; width: 100%; display: flex; align-items: flex-end; justify-content: center; }
.st-bar {
  width: 74%; max-width: 26px; min-height: 0; border-radius: 4px 4px 2px 2px;
  background: color-mix(in srgb, var(--brand) 28%, transparent);
  display: flex; align-items: flex-end; overflow: hidden;
}
.st-bar-know { width: 100%; background: var(--brand); border-radius: 0; }
.st-col.today .st-bar { outline: 2px solid var(--brand); outline-offset: 1px; }
.st-col-n { font-size: 10.5px; color: var(--text-dim); height: 13px; font-variant-numeric: tabular-nums; }
.st-col-x { font-size: 9.5px; color: var(--text-faint); white-space: nowrap; }

/* 没有数据时的柱状图：图留着（横轴日期是有信息量的），只是压扁，
   免得一整屏空白看着像页面坏了 */
.st-chart.flat { height: 58px; padding-top: 8px; }
.st-empty-hint { font-size: 12.5px; color: var(--text-dim); line-height: 1.6; }
.st-legend { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; margin-top: 12px; font-size: 11.5px; color: var(--text-dim); }
.lg { display: inline-flex; align-items: center; gap: 5px; }
.lg::before { content: ''; width: 10px; height: 10px; border-radius: 2px; }
.lg-know::before { background: var(--brand); }
.lg-rest::before { background: color-mix(in srgb, var(--brand) 28%, transparent); }
.st-hint { color: var(--text-faint); }

.st-per { display: grid; gap: 12px; }
.st-per-row { display: flex; align-items: center; gap: 9px; font-size: 12.5px; }
.st-per-name { flex: none; width: 74px; color: var(--text-dim); white-space: nowrap; }
.st-per-row .bar { flex: 1; }
.st-per-row .bar-fill { background: var(--c, var(--brand)); }
.st-per-num { flex: none; width: 62px; text-align: right; color: var(--text-faint); font-variant-numeric: tabular-nums; white-space: nowrap; }
.st-per-pct { flex: none; width: 34px; text-align: right; font-weight: 700; font-variant-numeric: tabular-nums; }

.st-dist { display: grid; gap: 10px; }
.st-dist-row { display: flex; align-items: center; gap: 10px; font-size: 12.5px; }
.st-dist-l { flex: none; width: 56px; color: var(--text-dim); }
.st-dist-bar { flex: 1; height: 9px; border-radius: 6px; background: var(--bg); overflow: hidden; }
.st-dist-bar span { display: block; height: 100%; border-radius: 6px; }
.st-dist-row.ok .st-dist-bar span { background: var(--ok); }
.st-dist-row.mid .st-dist-bar span { background: var(--warn); }
.st-dist-row.new .st-dist-bar span { background: var(--line); }
.st-dist-n { flex: none; width: 84px; text-align: right; color: var(--text-faint); font-variant-numeric: tabular-nums; }

.st-wrong { display: grid; gap: 6px; padding: 10px; }
.st-wrong-row {
  display: flex; align-items: center; gap: 9px; width: 100%; text-align: left;
  font: inherit; font-size: 12.5px; padding: 9px 11px; cursor: pointer;
  background: var(--bg); border: 1px solid transparent; border-radius: var(--radius-s); color: var(--text);
}
.st-wrong-row:hover { border-color: var(--c, var(--brand)); }
.st-wrong-n { flex: none; font-size: 11px; color: var(--bad); font-weight: 700; white-space: nowrap; }
.st-wrong-q { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* ===== 易错本筛选条 ===== */
.wc-filter { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 14px; }
.wc-filter .chip.on {
  background: color-mix(in srgb, var(--c, var(--brand)) 12%, var(--bg-elev));
  border-color: var(--c, var(--brand));
  color: var(--c, var(--brand));
  font-weight: 600;
}

/* ===== 搜索页 ===== */
.search-box {
  display: flex; align-items: center; gap: 8px;
  padding: 10px 12px; margin-bottom: 12px;
  background: var(--bg-elev); border: 1px solid var(--line); border-radius: 12px;
}
.search-box:focus-within { border-color: var(--brand); }
.search-ic { flex: none; font-size: 14px; opacity: .7; }
.search-input {
  flex: 1; min-width: 0; border: none; background: none; padding: 2px 0;
  font: inherit; font-size: 15px; color: var(--text);
}
.search-input:focus { outline: none; }
.search-input::-webkit-search-cancel-button { display: none; }
.search-clear {
  flex: none; width: 24px; height: 24px; border-radius: 50%;
  border: none; background: var(--bg); color: var(--text-faint);
  font-size: 12px; line-height: 1; cursor: pointer; padding: 0;
}
.search-clear:hover { color: var(--text); }

.search-meta {
  display: flex; align-items: baseline; flex-wrap: wrap;
  font-size: 12.5px; color: var(--text-dim); margin-bottom: 10px;
}
.search-meta .dim { color: var(--text-faint); }
.search-list { display: grid; gap: 8px; }
.search-hit {
  display: block; width: 100%; text-align: left; cursor: pointer; font: inherit;
  padding: 11px 13px; background: var(--bg-elev);
  border: 1px solid var(--line); border-left: 3px solid var(--c, var(--brand));
  border-radius: var(--radius-s); color: var(--text);
}
.search-hit:hover { background: color-mix(in srgb, var(--c) 5%, var(--bg-elev)); }
.search-hit:active { transform: scale(.995); }
.sh-top { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; margin-bottom: 5px; }
.sh-chapter { font-size: 11.5px; color: var(--text-faint); }
.sh-why { font-size: 10.5px; color: var(--text-faint); margin-left: auto; white-space: nowrap; }
.sh-q { font-size: 13.5px; font-weight: 600; line-height: 1.5; margin-bottom: 3px; }
.sh-a { font-size: 12px; color: var(--text-dim); line-height: 1.6; }
.hl { background: color-mix(in srgb, var(--warn) 30%, transparent); border-radius: 3px; padding: 0 1px; font-style: normal; }

.search-hot { margin-top: 22px; }
.search-hot-row { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  font: inherit; font-size: 12.5px; padding: 6px 12px; cursor: pointer;
  background: var(--bg-elev); border: 1px solid var(--line);
  border-radius: 20px; color: var(--text-dim);
}
.chip:hover { border-color: var(--brand); color: var(--brand); }

/* ===== 登录门（激活码弹窗）=====
 * 只在「还没登录 / 试用到期」时盖在最上面。样式跟前台一致，别做成广告弹窗的样子。 */
.gate-mask {
  position: fixed; inset: 0; z-index: 200;
  display: grid; place-items: center; padding: 20px;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px);
}
.gate-card {
  width: 100%; max-width: 380px; padding: 26px 22px 20px;
  background: var(--bg-elev); border: 1px solid var(--line);
  border-radius: 18px; box-shadow: var(--shadow);
  display: grid; gap: 12px; justify-items: center; text-align: center;
}
.gate-logo {
  width: 52px; height: 52px; border-radius: 16px;
  display: grid; place-items: center;
  background: var(--brand-grad); color: #fff;
  font-size: 17px; font-weight: 800; letter-spacing: -.5px;
}
.gate-title { margin: 0; font-size: 19px; }
.gate-sub { margin: 0; font-size: 12.5px; color: var(--text-dim); line-height: 1.6; }
.gate-input {
  width: 100%; padding: 12px 14px; font: inherit; font-size: 15px;
  letter-spacing: 1.2px; text-align: center; text-transform: uppercase;
  border: 1px solid var(--line); border-radius: 10px;
  background: var(--bg); color: var(--text);
}
.gate-input:focus { outline: 2px solid var(--brand); outline-offset: -1px; }
.gate-msg { min-height: 16px; font-size: 12px; color: var(--bad); line-height: 1.5; }
.gate-go { width: 100%; padding: 12px; font-size: 15px; }
.gate-or { font-size: 11.5px; color: var(--text-faint); }
.gate-trial { font-size: 12.5px; }
.gate-tip {
  margin-top: 4px; padding-top: 12px; border-top: 1px solid var(--line);
  font-size: 11.5px; color: var(--text-faint); line-height: 1.8; text-align: left; width: 100%;
}
.gate-tip b { color: var(--text-dim); }

/* 换绑确认界面（复用同一张卡片，把内容整体换掉） */
.gate-rebind { display: grid; gap: 10px; justify-items: center; text-align: center; width: 100%; }
.gr-em { font-size: 34px; line-height: 1; }
.gr-title { margin: 0; font-size: 16px; }
.gr-text { margin: 0; font-size: 12.5px; color: var(--text-dim); line-height: 1.7; }
.gr-left {
  font-size: 11.5px; padding: 3px 10px; border-radius: 20px;
  background: color-mix(in srgb, var(--warn) 14%, transparent); color: var(--warn);
}
.gr-msg { min-height: 16px; font-size: 12px; color: var(--bad); line-height: 1.5; }
.gr-btns { display: flex; gap: 8px; flex-wrap: wrap; justify-content: center; width: 100%; }
.gr-btns .btn { flex: 1; min-width: 120px; }

/* 顶栏上的授权角标：试用倒计时 / 快到期提醒 */
.auth-badge { flex: none; display: flex; align-items: center; padding-right: 4px; }
.top-remain {
  font-size: 11.5px; padding: 3px 9px; border-radius: 20px; white-space: nowrap;
  background: color-mix(in srgb, var(--warn) 14%, transparent);
  color: var(--warn); font-weight: 600;
}
.top-remain.trial { background: color-mix(in srgb, var(--bad) 12%, transparent); color: var(--bad); }

/* ===== 可视化共用：播放器 / 画布 / 图例 / 指标 ===== */
.viz-canvas {
  display: block; width: 100%; max-width: 100%;
  border-radius: var(--radius); background: var(--bg-elev);
  border: 1px solid var(--line);
  /* ⚠️ 这里以前是 touch-action: none —— 那是错的。
   * none 的意思是「浏览器不要对这个元素做任何默认触摸处理」，**包括竖向滚动**。
   * 画布又大又占屏幕中段，结果就是手指落在动画上往上划，页面纹丝不动
   * （用户报的「在动画区域会划不动屏幕」）。
   * 改成 pan-y：竖向滑动交还给浏览器翻页，横向/缩放仍留给 JS，
   * 画布上的点击（pointerdown）完全不受影响 —— 现有的点选交互都用 pointerdown。 */
  touch-action: pan-y;
}
.player {
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
  margin: 10px 0; padding: 8px 10px;
  background: var(--bg-elev); border: 1px solid var(--line); border-radius: var(--radius);
}
.player .btn { flex: none; min-width: 0; padding: 0 12px; min-height: 36px; font-size: 13.5px; }
.pl-label {
  font-size: 12px; color: var(--text-dim); font-variant-numeric: tabular-nums;
  min-width: 62px; text-align: center;
}
.seek {
  flex: 1 1 160px; min-width: 120px; height: 26px; margin: 0;
  accent-color: var(--brand); background: transparent;
}
.viz-field.inline { display: flex; align-items: center; gap: 6px; max-width: none; }
.text-input.compact { min-height: 32px; padding: 3px 8px; font-size: 13px; }

.viz-desc {
  min-height: 40px; padding: 9px 12px; margin-top: 10px;
  background: var(--bg-elev); border: 1px solid var(--line); border-left: 3px solid var(--brand);
  border-radius: var(--radius-s); font-size: 13.5px; line-height: 1.65;
}
.viz-legend {
  display: flex; gap: 14px; flex-wrap: wrap; align-items: center;
  font-size: 12px; color: var(--text-dim); margin: 10px 2px;
}
.viz-legend > span { display: inline-flex; align-items: center; gap: 5px; }
.viz-dot { width: 11px; height: 11px; border-radius: 3px; flex: none; display: inline-block; }

.viz-metrics { display: grid; grid-template-columns: repeat(auto-fit, minmax(96px, 1fr)); gap: 8px; margin: 12px 0; }
.viz-metric {
  padding: 9px 11px; background: var(--bg-elev); border: 1px solid var(--line);
  border-radius: var(--radius-s); text-align: center;
}
.viz-metric b { display: block; font-size: 17px; font-variant-numeric: tabular-nums; }
.viz-metric span { display: block; font-size: 11px; color: var(--text-dim); margin-top: 1px; }

.viz-note { font-size: 12px; color: var(--text-faint); margin-top: 8px; line-height: 1.6; }

/* 可视化里的小表格（关键路径的 e/l 表等） */
.viz-table-host { overflow-x: auto; margin: 12px 0; -webkit-overflow-scrolling: touch; }
.viz-table { width: 100%; min-width: 460px; border-collapse: collapse; font-size: 13px; font-variant-numeric: tabular-nums; }
.viz-table th, .viz-table td { border: 1px solid var(--line); padding: 6px 8px; text-align: center; }
.viz-table th { background: var(--bg); font-weight: 700; font-size: 12px; }
.viz-table tr.crit td { background: color-mix(in srgb, var(--bad) 10%, var(--bg-elev)); font-weight: 700; }
.seg.wrap { flex-wrap: wrap; }

/* 答案里的代码块（PV 操作、伪代码、算法题代码等）
 *
 * 代码必须「完整看得见」，所以**不加横向滚动条**，超宽就自动折行。
 * 折行用悬挂缩进（首行不缩、续行缩进 2 字符）来区分
 * 「浏览器自动折的」和「源码里真的换行了」。
 * 代码本身的前导缩进靠 white-space: pre-wrap 保留。 */
.md-pre {
  margin: 10px 0; padding: 11px 13px;
  background: var(--bg); border: 1px solid var(--line); border-radius: var(--radius-s);
}
.md-pre code {
  display: block;
  font-family: ui-monospace, "Cascadia Code", Consolas, monospace;
  font-size: 12.5px; line-height: 1.72;
  white-space: pre-wrap;          /* 保留空格与换行，同时允许自动折行 */
  overflow-wrap: anywhere;        /* 超长 token（长标识符）也要能断开 */
  word-break: break-word;
  text-indent: -2ch;              /* 悬挂缩进：续行比首行多缩 2 字符 */
  padding-left: 2ch;
  background: none; border: none; padding-top: 0; padding-bottom: 0;
  padding-right: 0; color: var(--text);
}
/* 窄屏再小一档，尽量让多数行不用折 */
@media (max-width: 620px) {
  .md-pre { padding: 9px 10px; }
  .md-pre code { font-size: 11.5px; line-height: 1.65; }
}

/* 协议字段面板（封装/解封装演示用） */
.proto-fields { margin: 12px 0; }
.pf-title { font-size: 13px; margin-bottom: 8px; }
.pf-title b { color: var(--brand); }
.pf-title span { color: var(--text-dim); font-size: 12px; }
.pf-list { display: flex; flex-wrap: wrap; gap: 6px; }
.pf-item {
  font-size: 11.5px; padding: 4px 9px; border-radius: 999px;
  background: color-mix(in srgb, var(--brand) 10%, var(--bg-elev));
  border: 1px solid color-mix(in srgb, var(--brand) 22%, var(--line));
  color: var(--text);
}

/* 参数输入网格（时延计算器用） */
.viz-ctrl.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 8px 14px;
  align-items: center;
}
.viz-ctrl.row.wrap { flex-wrap: wrap; }
.viz-ctrl .viz-field.inline { display: flex; align-items: center; gap: 8px; }
.viz-ctrl .viz-field.inline > span { flex: 0 0 auto; font-size: 12px; color: var(--text-dim); white-space: nowrap; }
.viz-ctrl .viz-field.inline > input { flex: 1 1 auto; min-width: 0; }

/* ===== 可视化两级导航 ===== */
/* 第一级：科目卡片上的「几个演示名预览」 */
.viz-preview {
  font-size: 11.5px; color: var(--text-faint); line-height: 1.5;
  margin-top: 3px; display: block;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.subj-card .viz-preview { max-width: 100%; }

/* 第二级：演示卡片改成「序号 + 文字块」两栏，扫起来更快 */
.viz-card { align-items: flex-start; }
.viz-idx {
  flex: none; width: 24px; height: 24px; margin-top: 1px;
  border-radius: 7px; display: grid; place-items: center;
  font-size: 12px; font-weight: 700; font-variant-numeric: tabular-nums;
  background: color-mix(in srgb, var(--brand) 14%, var(--bg-elev));
  color: var(--brand);
}
.viz-body { display: grid; gap: 3px; min-width: 0; }
.viz-body .viz-desc { line-height: 1.55; }

/* 快捷入口换行（现在是 5 个） */
.quick-row { flex-wrap: wrap; }
.quick-row .quick { flex: 1 1 calc(33.333% - 8px); min-width: 96px; }

/* 退场克隆：盖在旧卡位置上做滑出，不参与布局 */
.card-slide-ghost { z-index: 5; pointer-events: none; box-sizing: border-box; overflow: hidden; }

/* ===== 知识点详情页（可在本章内直接翻页） ===== */
.pt-view { max-width: 760px; margin: 0 auto; }
.pt-progress { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; }
.pt-progress-bar { flex: 1; height: 6px; border-radius: 3px; background: var(--line); overflow: hidden; }
.pt-progress-fill { height: 100%; background: var(--brand-grad); border-radius: 3px; transition: width .3s; }
.pt-progress-num { font-size: 12.5px; color: var(--text-dim); font-variant-numeric: tabular-nums; }
.pt-card { margin-bottom: 14px; overflow-x: clip; }
.pt-q { font-size: 19px; font-weight: 700; line-height: 1.5; margin: 4px 0 14px; }

.pt-nav { display: grid; gap: 10px; margin-top: 4px; }
.pt-nav .btn { display: grid; gap: 2px; justify-items: center; padding: 10px 14px; }
.pt-nav-sub { font-size: 11px; color: var(--text-faint); font-weight: 400; }
.pt-nav .btn.primary .pt-nav-sub { color: color-mix(in srgb, #fff 78%, transparent); }
.pt-tip { text-align: center; font-size: 11.5px; color: var(--text-faint); line-height: 1.6; }

/* 上一个/下一个并排，自评三个按钮在下面一行 */
@media (min-width: 480px) {
  .pt-nav { grid-template-columns: 1fr 1fr; }
  .pt-nav .grade-row { grid-column: 1 / -1; }
  .pt-tip { grid-column: 1 / -1; }
}
.pt-nav .grade-row { margin: 0; }

.tag.warn {
  background: color-mix(in srgb, var(--bad) 12%, var(--bg-elev));
  color: var(--bad); border-color: color-mix(in srgb, var(--bad) 28%, var(--line));
}

/* 代码块里「代码 + 行尾注释」的排版：
 * 中文注释是双宽的，跟在代码后面容易把整行顶到折行 ——
 * 所以注释单独占一行显示在代码下面，代码本身保持完整。 */
.md-pre code .ln-code { display: block; }
.md-pre code .ln-cmt {
  display: block;
  color: var(--text-faint);
  font-size: .92em;
  padding-left: 1.2em;
  margin-bottom: .15em;
}
@media (max-width: 620px) {
  .md-pre code .ln-cmt { font-size: .88em; padding-left: .8em; }
}

/* ===== 高频考点标记 ===== */
.ch-toolbar { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin-bottom: 12px; }
.ch-toolbar-hint { font-size: 11.5px; color: var(--text-faint); margin-left: auto; }
.ch-hot {
  font-size: 11px; font-weight: 700; padding: 1px 6px; border-radius: 999px;
  background: color-mix(in srgb, var(--bad) 12%, var(--bg-elev));
  color: var(--bad);
}

/* 章节头上的「待复习 N」：折叠状态也看得见，不用一章章点开找 */
.ch-due {
  flex: none; font-size: 11px; font-weight: 700; padding: 1px 7px;
  border-radius: 999px; white-space: nowrap;
  background: color-mix(in srgb, var(--accent) 14%, var(--bg-elev));
  color: var(--accent);
}

/* 知识点行左边的星标：★ 高频（醒目） · 常考（低调） */
.pt-hot { flex: none; width: 14px; text-align: center; font-size: 12px; line-height: 1; }
.pt-hot.hot { color: var(--bad); font-size: 13px; }
.pt-hot.warm { color: var(--text-faint); }

/* 高频行加一条左侧色条，扫一眼就能挑出来 */
.pt-row.hot { border-left: 3px solid color-mix(in srgb, var(--bad) 55%, transparent); }
.pt-row.warm { border-left: 3px solid color-mix(in srgb, var(--brand) 28%, transparent); }
.pt-row:not(.hot):not(.warm) { border-left: 3px solid transparent; }

/* 重要性标记分档：高频（红）比必考（橙）更醒目 */
.pt-hot.hot { color: var(--bad); font-size: 13px; }
.pt-hot.warm { color: #C2740B; font-size: 12.5px; }
.pt-row.hot { border-left: 3px solid color-mix(in srgb, var(--bad) 55%, transparent); }
.pt-row.warm { border-left: 3px solid color-mix(in srgb, #C2740B 45%, transparent); }

.tag.hot {
  background: color-mix(in srgb, var(--bad) 12%, var(--bg-elev));
  color: var(--bad);
  border-color: color-mix(in srgb, var(--bad) 30%, var(--line));
}

.tag.warm {
  background: color-mix(in srgb, #C2740B 12%, var(--bg-elev));
  color: #C2740B;
  border-color: color-mix(in srgb, #C2740B 30%, var(--line));
}

/* 文字型按钮（详情页底部的「回到列表」出口） */
.link-btn {
  background: none; border: none; padding: 4px 8px; cursor: pointer;
  font: inherit; font-size: 12px; color: var(--brand);
  text-decoration: underline; text-underline-offset: 3px;
}
.link-btn:hover { color: var(--text); }

/* 知识点详情页底部的「看相关演示」入口：整块可点，比一行文字链接显眼 */
.viz-link {
  display: flex; align-items: center; gap: 10px; width: 100%;
  margin-top: 16px; padding: 11px 13px;
  text-align: left; cursor: pointer; font: inherit;
  background: color-mix(in srgb, var(--brand) 8%, var(--bg-elev));
  border: 1px solid color-mix(in srgb, var(--brand) 28%, var(--line));
  border-radius: 12px; color: var(--text);
  transition: background .15s, border-color .15s, transform .1s;
}
.viz-link:hover { background: color-mix(in srgb, var(--brand) 14%, var(--bg-elev)); }
.viz-link:active { transform: scale(.985); }
.viz-link .vl-ic {
  flex: none; width: 26px; height: 26px; border-radius: 50%;
  display: grid; place-items: center; font-size: 11px; padding-left: 2px;
  background: var(--brand); color: #fff;
}
.viz-link .vl-body { flex: 1; min-width: 0; display: flex; flex-direction: column; gap: 2px; }
.viz-link .vl-name { font-size: 13px; font-weight: 600; }
.viz-link .vl-desc {
  font-size: 11.5px; color: var(--text-faint);
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.viz-link .vl-go { flex: none; font-size: 11.5px; color: var(--brand); font-weight: 600; }

/* ===== 播放条统一样式：位置在容器最顶部 + 滚动时吸顶 =====
 * 结构：.player-wrap（占满整个可视化区域，作为 sticky 的活动范围）
 *         └ .player（真正吸顶的那条）
 *         └ 原来的兄弟节点（参数栏、提示等）被挪进来
 */
.player-wrap { margin: 0 0 12px; }
.player-wrap.nosticky .player { position: static; }

.player {
  position: sticky;
  top: var(--viz-sticky-top, 0px);
  z-index: 20;
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
  padding: 8px 10px;
  border-radius: var(--radius-s);
  border: 1px solid var(--line);
  /* 必须有实底：吸顶后内容会从它下面滚过 */
  background: var(--bg-elev);
  box-shadow: 0 1px 6px rgba(0,0,0,.07);
}
.player .btn { flex: none; }
.player .seek { flex: 1 1 140px; min-width: 90px; }
.player .pl-label { flex: none; font-size: 12px; color: var(--text-dim); font-variant-numeric: tabular-nums; }
.player .viz-field.inline { flex: none; }

/* 手机上按钮太多会换行，压紧一点 */
@media (max-width: 480px) {
  .player { gap: 6px; padding: 7px 8px; }
  .player .btn { padding: 5px 9px; font-size: 12.5px; }
  .player .seek { flex-basis: 100%; }
}