/* ============================================================
   0. 重置 & 基础
   ============================================================ */
*,*::before,*::after{ box-sizing:border-box; }
html,body{ height:100%; }
body{
  margin:0;
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Segoe UI",Helvetica,Arial,sans-serif;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
ul,ol{ margin:0; padding:0; list-style:none; }
button{ font-family:inherit; }
input,textarea{ font-family:inherit; }
img,svg{ display:block; max-width:100%; }
a{ color:inherit; }
::selection{ background:var(--accent-glow); }

/* ============================================================
   1. 设计令牌 (Design Tokens)
   ============================================================ */
:root{
  /* -- 明快主题基调（多邻国式活力绿 + 卡其绿暗纸面） -- */
  --bg:#12161b;
  --bg-elevated:#1a2029;
  --bg-soft:#212832;
  --bg-hover:#2a323d;
  --border:#2e3640;
  --border-soft:#242b34;

  --paper:#2a3326;
  --paper-alt:#3a422f;
  --paper-line:#6a7656;
  --ink:#f4f7e8;
  --ink-soft:#d2d9b7;
  --ink-faint:#9aa57d;
  --surface-lift-1:rgba(255,255,255,.07);
  --surface-lift-2:rgba(255,255,255,.13);

  --text:#eef1f3;
  --text-soft:#a7afb8;
  --text-faint:#707a84;

  --accent:#58c46e;
  --accent-strong:#4bb862;
  --accent-shade:#2f8f45;
  --accent-ink:#ffffff;
  --accent-glow:rgba(88,196,110,.30);
  --ambient-glow:rgba(255,201,60,.16);

  --success:#58c46e;
  --success-bg:rgba(120,224,146,.24);
  --success-strong:#8ff0a4;
  --danger:#ef5b5b;
  --danger-bg:rgba(239,91,91,.22);
  --danger-strong:#ff9494;
  --info:#4fa6e0;
  --info-bg:rgba(79,166,224,.22);
  --info-strong:#8ecbf1;
  --gold:#ffc93c;
  --gold-bg:rgba(255,201,60,.16);
  --gold-ink:#3a2a02;

  --shadow-card:0 20px 60px -15px rgba(0,0,0,.55), 0 2px 8px rgba(0,0,0,.35);
  --shadow-pop:0 10px 30px -8px rgba(0,0,0,.45);
  --shadow-glow:0 0 0 1px rgba(255,201,60,.16), 0 20px 70px -10px rgba(255,201,60,.22);

  --radius-sm:10px;
  --radius-md:16px;
  --radius-lg:26px;
  --radius-pill:999px;

  --ease:cubic-bezier(.22,.9,.32,1);
  --ease-spring:cubic-bezier(.34,1.56,.64,1);
  --dur-fast:.15s;
  --dur:.32s;
  --dur-slow:.5s;

  --font-display:"Noto Serif SC",serif;
  --font-num:"Newsreader",serif;
  color-scheme:dark;
}

html[data-theme="light"]{
  --bg:#f7f8f2;
  --bg-elevated:#ffffff;
  --bg-soft:#eef2ea;
  --bg-hover:#e2e9dd;
  --border:#dde5d7;
  --border-soft:#e8eee3;

  --paper:#ffffff;
  --paper-alt:#f4f0e6;
  --paper-line:#e6e0cf;
  --ink:#26201a;
  --ink-soft:#6c6250;
  --ink-faint:#9b9078;
  --surface-lift-1:rgba(255,255,255,.5);
  --surface-lift-2:rgba(255,255,255,.75);

  --text:#212b22;
  --text-soft:#57624f;
  --text-faint:#8a9482;

  --accent:#3dae5a;
  --accent-strong:#329a4c;
  --accent-shade:#1f7a38;
  --accent-ink:#ffffff;
  --accent-glow:rgba(61,174,90,.20);
  --ambient-glow:rgba(240,165,0,.12);

  --success:#3dae5a;
  --success-bg:rgba(61,174,90,.12);
  --success-strong:#1f7a38;
  --danger:#e2483f;
  --danger-bg:rgba(226,72,63,.12);
  --danger-strong:#b83128;
  --info:#3f8fd6;
  --info-bg:rgba(63,143,214,.12);
  --info-strong:#2a6ba8;
  --gold:#f0a500;
  --gold-bg:rgba(240,165,0,.14);
  --gold-ink:#3a2a02;

  --shadow-card:0 20px 50px -18px rgba(38,32,20,.22), 0 2px 8px rgba(38,32,20,.10);
  --shadow-pop:0 10px 26px -10px rgba(38,32,20,.18);
  --shadow-glow:0 0 0 1px rgba(240,165,0,.14), 0 16px 50px -12px rgba(240,165,0,.18);
  color-scheme:light;
}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
}

/* ============================================================
   2. 基础版式
   ============================================================ */
body{
  background:var(--bg);
  color:var(--text);
  transition:background var(--dur) var(--ease),color var(--dur) var(--ease);
}
body::before{
  /* 环境氛围：极淡的暖光晕，呼应"台灯"概念 */
  content:"";
  position:fixed; inset:0;
  background:radial-gradient(ellipse 900px 600px at 50% -8%, var(--ambient-glow), transparent 60%);
  opacity:.5;
  pointer-events:none;
  z-index:0;
}
html[data-theme="light"] body::before{ opacity:.35; }

h1,h2,h3,h4{ margin:0; font-family:var(--font-display); font-weight:600; letter-spacing:.01em; }
.num{ font-family:var(--font-num); font-style:italic; font-weight:500; }
.streak-num{ font-weight:800; }

:focus-visible{
  outline:2px solid var(--accent);
  outline-offset:3px;
  border-radius:6px;
}
button:focus-visible{ outline-offset:2px; }

/* ============================================================
   3. 应用外壳 / 顶部导航
   ============================================================ */
#app-root{ position:relative; z-index:1; min-height:100vh; display:flex; flex-direction:column; }

.topnav{
  position:sticky; top:0; z-index:40;
  display:flex; align-items:center; gap:18px;
  padding:14px 22px;
  background:color-mix(in srgb, var(--bg-elevated) 88%, transparent);
  backdrop-filter:blur(14px) saturate(1.2);
  border-bottom:1px solid var(--border-soft);
}
.brand{
  display:flex; align-items:center; gap:10px;
  font-family:var(--font-display); font-weight:700; font-size:16.5px;
  letter-spacing:.01em;
  color:var(--text);
  white-space:nowrap;
}
.brand .brand-mark{
  display:inline-flex; align-items:center; justify-content:center;
  width:28px;height:28px; border-radius:9px;
  background:linear-gradient(155deg,var(--accent-strong),var(--accent));
  color:var(--accent-ink); font-size:15px;
  transform:rotate(-6deg);
  box-shadow:0 4px 10px -3px rgba(0,0,0,.35);
}
.nav-spacer{ flex:1; }

.streak-pill{
  display:flex; align-items:center; gap:6px;
  padding:6px 12px 6px 9px;
  border-radius:var(--radius-pill);
  background:var(--gold-bg);
  color:var(--gold);
  font-size:13px; font-weight:600;
  border:1px solid color-mix(in srgb, var(--gold) 40%, transparent);
  white-space:nowrap;
}
.streak-pill .flame{ font-size:14px; filter:drop-shadow(0 0 6px color-mix(in srgb, var(--gold) 60%, transparent)); }
.streak-pill.streak-placeholder{
  display:none;
  visibility:hidden;
  pointer-events:none;
}
.streak-pill.bump{ animation:streakBump .5s var(--ease-spring); }
@keyframes streakBump{ 0%{transform:scale(1)} 35%{transform:scale(1.28)} 100%{transform:scale(1)} }

.nav-tabs{ display:flex; gap:4px; background:var(--bg-soft); padding:4px; border-radius:var(--radius-pill); border:1px solid var(--border-soft); }
.nav-tab{
  border:none; background:transparent; cursor:pointer;
  padding:7px 16px; border-radius:var(--radius-pill);
  font-size:13.5px; font-weight:600; color:var(--text-soft);
  transition:background var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease);
}
.nav-tab:hover{ color:var(--text); }
.nav-tab.active{ background:var(--accent); color:var(--accent-ink); }

.icon-btn{
  width:34px;height:34px; border-radius:50%;
  border:1px solid var(--border-soft); background:var(--bg-soft); color:var(--text-soft);
  display:grid; place-items:center; cursor:pointer; font-size:15px; padding:0; line-height:1;
  transition:transform var(--dur-fast) var(--ease), background var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease);
}
.icon-btn svg{ width:16px; height:16px; display:block; flex:0 0 16px; margin:auto; overflow:visible; }
.icon-btn:hover{ background:var(--bg-hover); color:var(--text); transform:translateY(-1px); }

main#view{ flex:1; display:flex; flex-direction:column; position:relative; z-index:30; background:var(--bg); touch-action:pan-y; }
main#view.view-dragging{ transition:none; will-change:transform, opacity; }
main#view.view-snap{ transition:transform .34s cubic-bezier(.22,1,.36,1), opacity .34s cubic-bezier(.22,1,.36,1); will-change:transform, opacity; }
body.view-swipe-active{ overscroll-behavior-x:contain; }
.view-swipe-preview{
  position:fixed; left:0; right:0; top:60px; bottom:0; z-index:20;
  display:flex; flex-direction:column; overflow:hidden; background:var(--bg);
  pointer-events:none; opacity:0; transform:translate3d(0,0,0);
  will-change:transform, opacity;
}
.view-swipe-preview.view-snap{ transition:opacity .34s cubic-bezier(.22,1,.36,1); }

/* ============================================================
   4. 按钮
   ============================================================ */
.btn{
  position:relative; isolation:isolate;
  display:inline-flex; align-items:center; justify-content:center; gap:8px;
  border-radius:var(--radius-pill);
  border:none;
  padding:12px 22px;
  font-size:14.5px; font-weight:700;
  cursor:pointer;
  transition:transform var(--dur-fast) var(--ease), box-shadow var(--dur-fast) var(--ease), background var(--dur-fast) var(--ease), opacity var(--dur-fast) var(--ease);
  white-space:nowrap;
  user-select:none;
}
.btn:active:not(:disabled){ transform:translateY(3px); }
.btn:disabled{ opacity:.4; cursor:not-allowed; transform:none; }
.btn-primary{ background:var(--accent); color:var(--accent-ink); box-shadow:0 4px 0 0 var(--accent-shade); }
.btn-primary:hover:not(:disabled){ background:var(--accent-strong); }
.btn-primary:active:not(:disabled){ box-shadow:0 1px 0 0 var(--accent-shade); }
.btn:focus-visible{
  outline:none;
  box-shadow:var(--btn-depth-shadow, none);
}
.btn:focus-visible::before{
  content:""; position:absolute; top:-10px; right:-10px; bottom:calc(-10px - var(--btn-depth, 0px)); left:-10px; z-index:-1;
  border-radius:999px;
  background:color-mix(in srgb, var(--accent) 20%, transparent);
  box-shadow:inset 0 0 0 0 transparent;
  pointer-events:none;
}
.btn-primary{ --btn-depth:4px; --btn-depth-shadow:0 4px 0 0 var(--accent-shade); }
.btn-primary:active:not(:disabled){ --btn-depth:1px; --btn-depth-shadow:0 1px 0 0 var(--accent-shade); }
.btn-secondary{ background:var(--bg-soft); color:var(--text); box-shadow:0 4px 0 0 var(--border); }
.btn-secondary:hover:not(:disabled){ background:var(--bg-hover); }
.btn-secondary:active:not(:disabled){ box-shadow:0 1px 0 0 var(--border); }
.btn-secondary{ --btn-depth:4px; --btn-depth-shadow:0 4px 0 0 var(--border); }
.btn-secondary:active:not(:disabled){ --btn-depth:1px; --btn-depth-shadow:0 1px 0 0 var(--border); }
.btn-ghost{ background:transparent; color:var(--text-soft); box-shadow:none !important; }
.btn-ghost:hover:not(:disabled){ color:var(--text); background:var(--bg-soft); }
.btn-ghost:active:not(:disabled){ transform:scale(.96); }
.btn-ghost:focus-visible{ box-shadow:none !important; }
.btn-danger{ background:var(--danger-bg); color:var(--danger-strong); box-shadow:0 4px 0 0 color-mix(in srgb, var(--danger) 30%, transparent); }
.btn-danger:hover:not(:disabled){ background:color-mix(in srgb, var(--danger) 22%, transparent); }
.btn-danger:active:not(:disabled){ box-shadow:0 1px 0 0 color-mix(in srgb, var(--danger) 30%, transparent); }
.btn-danger{ --btn-depth:4px; --btn-depth-shadow:0 4px 0 0 color-mix(in srgb, var(--danger) 30%, transparent); }
.btn-danger:active:not(:disabled){ --btn-depth:1px; --btn-depth-shadow:0 1px 0 0 color-mix(in srgb, var(--danger) 30%, transparent); }
.btn:active:focus-visible:not(:disabled){
  box-shadow:var(--btn-depth-shadow, none);
}
.btn-block{ width:100%; }
.btn-lg{ padding:16px 28px; font-size:16px; }
.kbd{
  display:inline-flex; align-items:center; justify-content:center;
  min-width:18px; height:18px; padding:0 4px;
  border-radius:5px; font-size:10.5px; font-weight:700;
  background:rgba(0,0,0,.18); color:inherit; opacity:.65;
  font-family:-apple-system,sans-serif;
}
.kbd svg{ width:12px; height:12px; display:block; stroke:currentColor; stroke-width:2.4; fill:none; stroke-linecap:round; stroke-linejoin:round; }
.btn-primary .kbd{ background:rgba(0,0,0,.16); }

/* ============================================================
   5. 通用容器 / 面板
   ============================================================ */
.container{ max-width:880px; margin:0 auto; width:100%; padding:0 20px; }
.panel{
  background:var(--bg-elevated);
  border:1px solid var(--border-soft);
  border-radius:var(--radius-lg);
  padding:26px;
}
.section-title{
  font-size:13px; font-weight:700; letter-spacing:.08em; text-transform:uppercase;
  color:var(--text-faint); margin-bottom:14px; display:flex; align-items:center; gap:8px;
}
.section-title .line{ flex:1; height:1px; background:var(--border-soft); }
.muted{ color:var(--text-soft); }
.center-col{ display:flex; flex-direction:column; align-items:center; justify-content:center; flex:1; padding:40px 20px; text-align:center; }

/* ============================================================
   6. 加载 / 拖拽题库
   ============================================================ */
.dropzone{
  width:100%; max-width:640px;
  border:2px dashed var(--border);
  border-radius:var(--radius-lg);
  padding:52px 30px;
  display:flex; flex-direction:column; align-items:center; gap:14px;
  background:var(--bg-elevated);
  transition:border-color var(--dur) var(--ease), background var(--dur) var(--ease), transform var(--dur) var(--ease);
  cursor:pointer;
}
.dropzone:hover{ border-color:var(--accent); }
.dropzone.dragover{
  border-color:var(--accent);
  background:var(--accent-glow);
  transform:scale(1.015);
}
.dropzone .dz-icon{
  width:64px;height:64px; border-radius:var(--radius-md);
  background:linear-gradient(160deg,var(--paper),var(--paper-alt));
  display:flex; align-items:center; justify-content:center;
  font-size:28px; box-shadow:var(--shadow-pop);
  transform:rotate(-4deg);
}
.dropzone h3{ font-size:19px; color:var(--text); }
.dropzone p{ margin:0; color:var(--text-soft); font-size:13.5px; line-height:1.6; }
.dz-hint{ font-size:12px; color:var(--text-faint); margin-top:2px; }
.hidden-input{ position:absolute; width:1px;height:1px; opacity:0; overflow:hidden; }
.format-guide{
  width:100%; max-width:640px; margin-top:14px; padding:16px;
  background:var(--bg-elevated); border:1px solid var(--border-soft); border-radius:var(--radius-lg);
  text-align:left;
}
.format-guide summary{
  list-style:none; display:flex; align-items:center; justify-content:space-between; gap:12px;
  cursor:pointer; user-select:none;
}
.format-guide summary::-webkit-details-marker{ display:none; }
.format-guide summary::after{ content:"▾"; color:var(--text-faint); transition:transform var(--dur-fast) var(--ease); }
.format-guide[open] summary::after{ transform:rotate(180deg); }
.format-guide h4{ font-size:14px; color:var(--text); margin:0; font-family:inherit; }
.format-guide-body{ margin-top:10px; }
.format-guide p{ margin:0 0 10px; color:var(--text-soft); font-size:12.8px; line-height:1.7; }
.format-guide-grid{ display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:8px; }
.format-item{
  border:1px solid var(--border-soft); background:var(--bg-soft); border-radius:var(--radius-md);
  padding:10px 11px; min-width:0;
}
.format-item b{ display:block; color:var(--text); font-size:12.5px; margin-bottom:4px; }
.format-item span{ display:block; color:var(--text-faint); font-size:11.5px; line-height:1.55; overflow-wrap:anywhere; }
.format-guide code{ color:var(--accent); font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace; font-size:.92em; }

.demo-link{
  margin-top:18px; font-size:13px; color:var(--text-faint);
  display:flex; align-items:center; gap:8px;
}
.demo-link button{ background:none;border:none;color:var(--accent);font-weight:600;cursor:pointer;font-size:13px;padding:0; text-decoration:underline; text-decoration-color:transparent; transition:text-decoration-color .15s; }
.demo-link button:hover{ text-decoration-color:var(--accent); }

.local-deck-panel{
  width:100%; max-width:640px; margin-top:18px;
  background:var(--bg-elevated); border:1px solid var(--border-soft); border-radius:var(--radius-lg);
  padding:16px; text-align:left;
}
.local-deck-title{ font-size:12px; font-weight:700; color:var(--text-faint); margin-bottom:10px; letter-spacing:.06em; text-transform:uppercase; }
.local-deck-list{ display:flex; flex-direction:column; gap:8px; max-height:260px; overflow-y:auto; padding:3px 2px 2px; }
.local-deck-btn{
  display:flex; align-items:center; justify-content:space-between; gap:14px;
  width:100%; border:1px solid var(--border-soft); background:var(--bg-soft); color:var(--text);
  padding:11px 13px; border-radius:var(--radius-md); cursor:pointer; text-align:left;
  transition:background var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease);
}
.local-deck-btn:hover{ background:var(--bg-hover); border-color:var(--accent); transform:translateY(-1px); }
.local-deck-btn.active{ border-color:var(--accent); background:var(--accent-glow); box-shadow:inset 0 0 0 1px color-mix(in srgb, var(--accent) 45%, transparent); }
.local-deck-btn span{ min-width:0; overflow:hidden; text-overflow:ellipsis; white-space:nowrap; font-size:13px; font-weight:700; }
.local-deck-btn b{ flex-shrink:0; font-family:var(--font-num); font-style:italic; color:var(--accent); font-size:13px; }

.load-error{
  margin-top:16px; max-width:640px; width:100%;
  background:var(--danger-bg); border:1px solid color-mix(in srgb, var(--danger) 35%, transparent); color:var(--danger-strong);
  border-radius:var(--radius-md); padding:14px 16px; font-size:13px; line-height:1.7; text-align:left;
  white-space:pre-wrap;
}

/* ============================================================
   7. 设置 / 学习模式选择
   ============================================================ */
.deck-info-card{
  display:flex; align-items:center; gap:16px;
  padding:18px 20px; border-radius:var(--radius-lg);
  background:linear-gradient(155deg,var(--paper),var(--paper-alt));
  color:var(--ink); box-shadow:var(--shadow-pop); margin-bottom:26px;
}
.deck-info-card .deck-emoji{ font-size:30px; }
.deck-info-card > div{ min-width:0; }
.deck-info-card h2{ font-size:19px; color:var(--ink); overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
.deck-info-card p{ margin:4px 0 0; font-size:12.5px; color:var(--ink-soft); line-height:1.6; display:-webkit-box; -webkit-line-clamp:2; -webkit-box-orient:vertical; overflow:hidden; }
.deck-info-card #browse-deck-btn{ margin-left:auto; }
.deck-info-card .swap{ margin-left:12px; }
.deck-switcher{
  display:flex; flex-wrap:wrap; gap:8px; margin:-12px 0 24px; max-height:92px; overflow-y:auto; padding-right:2px;
}
.deck-switch-select{ display:none; width:100%; margin:-12px 0 24px; }
.deck-switch-select select{
  width:100%; border:1px solid var(--border); border-radius:var(--radius-pill);
  background:var(--bg-elevated); color:var(--text); padding:10px 14px; font-size:13px; font-weight:700;
}
.deck-switcher button{
  display:flex; align-items:center; gap:8px; border:1px solid var(--border-soft); background:var(--bg-elevated);
  color:var(--text-soft); border-radius:var(--radius-pill); padding:7px 12px; cursor:pointer; font-size:12.5px; font-weight:700;
  max-width:260px;
}
.deck-switcher span{ min-width:0; overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
.deck-switcher button.active{ border-color:var(--accent); background:var(--accent-glow); color:var(--text); }
.deck-switcher b{ color:var(--accent); font-family:var(--font-num); font-style:italic; }

.mode-grid{ display:grid; grid-template-columns:repeat(3,1fr); gap:14px; margin-bottom:28px; }
.mode-card{
  position:relative; text-align:left; cursor:pointer;
  border:1.5px solid var(--border); border-radius:var(--radius-lg);
  background:var(--bg-elevated); padding:18px 16px 16px;
  transition:border-color var(--dur) var(--ease), transform var(--dur) var(--ease), background var(--dur) var(--ease);
}
.mode-card:hover{ transform:translateY(-2px); border-color:var(--border); background:var(--bg-soft); }
.mode-card.selected{ border-color:var(--accent); background:linear-gradient(160deg,var(--accent-glow),transparent); box-shadow:0 0 0 1px var(--accent) inset; }
.mode-card .mode-icon{ font-size:22px; margin-bottom:10px; display:block; }
.mode-card h4{ font-size:15px; color:var(--text); margin-bottom:5px; }
.mode-card p{ margin:0; font-size:12px; color:var(--text-soft); line-height:1.6; min-height:48px; }
.mode-card .mode-tag{ display:inline-block; margin-top:10px; font-size:10.5px; padding:3px 8px; border-radius:var(--radius-pill); background:var(--bg-soft); color:var(--text-faint); font-weight:600; }
.mode-card.selected .mode-tag{ background:var(--accent); color:var(--accent-ink); }

.setup-grid{ display:grid; grid-template-columns:1fr 1fr; gap:16px; }
@media (max-width:720px){ .setup-grid{ grid-template-columns:1fr; } .mode-grid{ grid-template-columns:1fr; } }

.type-chip{
  display:inline-flex; align-items:center; gap:7px;
  padding:9px 14px; border-radius:var(--radius-pill);
  border:1.5px solid var(--border); background:var(--bg-soft); color:var(--text-soft);
  font-size:13px; font-weight:600; cursor:pointer; user-select:none;
  transition:all var(--dur-fast) var(--ease);
}
.type-chip .cnt{ font-family:var(--font-num); font-style:italic; opacity:.75; font-size:12px; }
.type-chip.on{ border-color:var(--accent); background:var(--accent-glow); color:var(--text); }
.type-chip.on .chip-check{ color:var(--accent); }
.chips-row{ display:flex; flex-wrap:wrap; gap:9px; }
.tf-filter-row{ display:flex; align-items:center; justify-content:space-between; flex-wrap:wrap; gap:8px; margin-top:12px; padding-top:12px; border-top:1px dashed var(--border-soft); }
.tf-filter-label{ font-size:12px; color:var(--text-faint); }
.source-scope-row{ display:flex; align-items:center; justify-content:space-between; flex-wrap:wrap; gap:10px; margin-bottom:14px; }
.chapter-filter-row{ margin-top:12px; padding-top:12px; border-top:1px dashed var(--border-soft); }
.chapter-chip-row{ display:flex; flex-wrap:wrap; gap:7px; margin-top:9px; max-height:112px; overflow:auto; padding-right:2px; }
.chapter-chip{
  border:1px solid var(--border-soft); background:var(--bg-soft); color:var(--text-soft); border-radius:var(--radius-pill);
  padding:6px 10px; font-size:12px; font-weight:700; cursor:pointer;
}
.chapter-chip.active{ background:var(--accent); border-color:var(--accent); color:var(--accent-ink); }

.toggle-row{ display:flex; align-items:center; justify-content:space-between; padding:13px 0; border-bottom:1px solid var(--border-soft); }
.toggle-row:last-child{ border-bottom:none; }
.toggle-row .label{ font-size:14px; color:var(--text); font-weight:600; }
.toggle-row .desc{ font-size:12px; color:var(--text-faint); margin-top:2px; }
.switch{ position:relative; width:42px; height:24px; padding:0; border-radius:var(--radius-pill); background:var(--bg-soft); border:1px solid var(--border); cursor:pointer; flex-shrink:0; transition:background var(--dur) var(--ease); }
.switch.on{ background:var(--accent); border-color:var(--accent); }
.switch .knob{ position:absolute; top:2px; left:2px; width:18px; height:18px; border-radius:50%; background:var(--text); transition:transform var(--dur) var(--ease-spring), background var(--dur) var(--ease); }
.switch.on .knob{ transform:translateX(18px); background:var(--accent-ink); }

.qty-row{ display:flex; align-items:center; gap:10px; flex-wrap:wrap; }
.seg{ display:flex; background:var(--bg-soft); border:1px solid var(--border); border-radius:var(--radius-pill); padding:3px; }
.seg button{ border:none; background:transparent; padding:7px 14px; border-radius:var(--radius-pill); font-size:12.5px; font-weight:600; color:var(--text-soft); cursor:pointer; }
.seg button.active{ background:var(--accent); color:var(--accent-ink); }
.num-input{
  width:76px; padding:8px 10px; border-radius:var(--radius-sm); border:1px solid var(--border);
  background:var(--bg-soft); color:var(--text); font-size:13px; text-align:center;
}

.collapsible-head{
  display:flex; align-items:center; gap:10px; cursor:pointer; user-select:none;
  padding:8px 6px; margin:-8px -6px; border-radius:var(--radius-sm);
  border:none; background:transparent; width:calc(100% + 12px); text-align:left; font-family:inherit;
  font-size:14.5px; font-weight:700; color:var(--text);
  transition:background var(--dur-fast) var(--ease);
}
.collapsible-head:hover{ background:var(--bg-soft); }
.collapsible-head .chev{ transition:transform var(--dur) var(--ease); font-size:17px; color:var(--text-faint); flex-shrink:0; line-height:1; }
.collapsible-head.open .chev{ transform:rotate(90deg); color:var(--accent); }
.collapsible-body{ overflow:hidden; max-height:0; transition:max-height var(--dur-slow) var(--ease); }
.collapsible-body.open{ max-height:600px; }
.adv-panel{ margin-top:16px; }
.mobile-collapse-head{ display:none; }
.mobile-collapse-body{ display:block; }
.points-grid{ display:grid; grid-template-columns:repeat(auto-fit,minmax(150px,1fr)); gap:12px; margin-top:16px; }
.points-item{ display:flex; align-items:center; justify-content:space-between; gap:8px; background:var(--bg-soft); padding:10px 12px; border-radius:var(--radius-md); border:1px solid var(--border-soft); }
.points-item span{ font-size:12.5px; color:var(--text-soft); }
.mock-preview{ margin-top:12px; padding:13px 15px; background:var(--accent-glow); border:1px solid rgba(88,196,110,.3); border-radius:var(--radius-md); font-size:12.5px; color:var(--text-soft); line-height:1.7; }
.mock-preview b{ color:var(--accent-strong); font-family:var(--font-num); font-style:italic; }

.start-bar{ display:flex; align-items:center; justify-content:space-between; gap:16px; margin-top:28px; padding-top:22px; border-top:1px solid var(--border-soft); }
.start-bar .est{ font-size:12.5px; color:var(--text-faint); }
.start-bar .est b{ color:var(--text); font-family:var(--font-num); font-style:italic; font-size:15px; }

/* ============================================================
   8. 答题卡片流 (核心界面)
   ============================================================ */
.quiz-shell{ flex:1; display:flex; flex-direction:column; }
.quiz-topbar{ display:flex; align-items:center; gap:14px; padding:16px 22px 6px; }
.progress-track{ flex:1; height:6px; border-radius:var(--radius-pill); background:var(--bg-soft); overflow:hidden; }
.progress-fill{ height:100%; border-radius:var(--radius-pill); background:linear-gradient(90deg,var(--accent),var(--gold)); transition:width var(--dur-slow) var(--ease); }
.progress-label{ font-size:12.5px; color:var(--text-faint); white-space:nowrap; font-family:var(--font-num); font-style:italic; }
.quiz-exit{ font-size:12.5px; }

.card-stage{
  flex:1; display:flex; align-items:center; justify-content:center;
  padding:22px 20px 40px; position:relative;
}
.card-stack{ position:relative; width:100%; max-width:600px; }
.card-stack::before, .card-stack::after{
  content:""; position:absolute; left:50%; right:0; border-radius:var(--radius-lg);
  background:var(--paper-alt); opacity:.55;
}
.card-stack::before{ top:-8px; width:94%; height:100%; transform:translateX(-50%) scale(.98); z-index:-1; opacity:.5;}
.card-stack::after{ top:-16px; width:88%; height:100%; transform:translateX(-50%) scale(.96); z-index:-2; opacity:.3;}

.qcard{
  position:relative; z-index:1;
  background:linear-gradient(165deg,var(--paper),var(--paper-alt) 130%);
  color:var(--ink);
  border-radius:var(--radius-lg);
  box-shadow:var(--shadow-card), var(--shadow-glow);
  padding:38px 34px 30px;
  min-height:320px;
  display:flex; flex-direction:column;
  animation:cardIn .4s var(--ease);
}
@keyframes cardIn{ from{ opacity:0; transform:translateY(5px) scale(.994); } to{ opacity:1; transform:none; } }
.qcard.no-enter{ animation:none; }
.qcard.leaving{ animation:cardOut .12s ease forwards !important; pointer-events:none; }
@keyframes cardOut{ from{ opacity:1; } to{ opacity:0; } }
.qcard.flipping{ animation:cardFlip .38s var(--ease); }
@keyframes cardFlip{ 0%{ transform:scale(1) rotateX(0); opacity:1; } 45%{ transform:scale(.98) rotateX(5deg); opacity:.75;} 100%{ transform:scale(1) rotateX(0); opacity:1; } }
.qcard.shake{ animation:cardShake .32s ease; }
@keyframes cardShake{ 0%,100%{transform:translateX(0)} 20%{transform:translateX(-7px)} 40%{transform:translateX(6px)} 60%{transform:translateX(-4px)} 80%{transform:translateX(3px)} }
.qcard.pulse-good{ box-shadow:var(--shadow-card), 0 0 0 3px var(--success); }
.qcard.pulse-bad{ box-shadow:var(--shadow-card), 0 0 0 3px var(--danger); }

.qcard-tools{ position:absolute; top:28px; right:34px; display:flex; align-items:center; gap:8px; z-index:2; }
.bookmark-btn{
  width:34px; height:34px; aspect-ratio:1; flex:0 0 34px; padding:0; border-radius:50%; border:1px solid var(--paper-line);
  background:var(--surface-lift-1); color:var(--ink-faint); cursor:pointer; font-size:20px; line-height:1;
  display:flex; align-items:center; justify-content:center; transition:all var(--dur-fast) var(--ease);
}
.bookmark-btn:hover{ transform:translateY(-1px); background:var(--surface-lift-2); color:var(--gold); border-color:var(--gold); }
.bookmark-btn.on{ background:var(--gold-bg); color:var(--gold); border-color:color-mix(in srgb, var(--gold) 60%, transparent); }
.wrong-chip{
  padding:5px 9px; border-radius:var(--radius-pill); background:var(--danger-bg); color:var(--danger-strong);
  font-size:11px; font-weight:800; border:1px solid color-mix(in srgb, var(--danger) 35%, transparent); white-space:nowrap;
}

.qcard-type{ font-size:11px; font-weight:700; letter-spacing:.08em; text-transform:uppercase; color:var(--ink-faint); margin-bottom:16px; padding-right:118px; display:flex; align-items:center; gap:8px; overflow-wrap:anywhere; }
.qcard-type .dot{ width:5px;height:5px; flex:0 0 5px; aspect-ratio:1; border-radius:50%; background:currentColor; }
.qcard-question{ font-family:var(--font-display); font-size:22px; line-height:1.65; color:var(--ink); font-weight:500; flex:0 0 auto; white-space:pre-wrap; overflow-wrap:anywhere; word-break:break-word; }
.qcard-question .blank{ display:inline-block; width:86px; height:1.05em; vertical-align:-4px; border-bottom:3px solid var(--ink-faint); border-radius:0; margin:0 2px; }
.inline-blank-choice{
  position:relative; display:inline-flex; align-items:center; justify-content:center; min-width:70px; min-height:1.45em; margin:0 4px; padding:0 10px 4px;
  border:none; border-radius:0; background:transparent; color:var(--ink-soft); box-sizing:border-box;
  appearance:none; -webkit-appearance:none; font-family:inherit; font-size:.88em; line-height:1.2; font-weight:800; cursor:pointer; vertical-align:baseline; transition:all .18s var(--ease);
}
.inline-blank-choice::after{ content:""; position:absolute; left:9px; right:9px; bottom:0; height:3px; background:var(--ink-faint); border-radius:0; }
.blank-line-only{ display:inline-block; width:82px; height:.8em; transform:translateY(-1px); }
.inline-blank-choice.filled{ color:var(--success-strong); background:transparent; box-shadow:none; animation:blankFill .18s var(--ease); }
.inline-blank-choice.filled::after,.inline-blank-choice.correct::after{ background:var(--success); }
.inline-blank-choice.correct{ color:var(--success-strong); background:transparent; }
.inline-blank-choice.wrong{ color:var(--danger-strong); background:transparent; }
.inline-blank-choice.wrong::after{ background:var(--danger); }
.inline-blank-choice.active{ border:1.5px solid var(--accent); border-radius:12px; background:var(--surface-lift-1); box-shadow:0 0 0 3px var(--accent-glow); animation:blankFocus .22s var(--ease); }
.inline-blank-choice.active::after{ display:none; }
@keyframes blankFocus{ from{ transform:translateX(-8px) scale(.96); } to{ transform:translateX(0) scale(1); } }
@keyframes blankFill{ from{ transform:scale(.96); } to{ transform:scale(1); } }
.per-blank-options{ margin-top:34px; }

.blank-wrap{ position:relative; display:inline-flex; align-items:center; width:max(112px, calc(var(--blank-chars, 6) * 1.05em + 24px)); max-width:100%; height:1.45em; vertical-align:middle; margin:0 2px; transition:width var(--dur-fast) var(--ease); }
.qcard-blank-input{
  border:none; background:transparent; width:100%; box-sizing:border-box;
  font-family:var(--font-display); font-size:1em; line-height:1.1; font-weight:800; color:var(--ink); text-align:center;
  padding:0 4px 4px; outline:none;
}
.blank-underline{ position:absolute; left:2px; right:2px; bottom:.12em; height:3px; background:var(--ink-faint); border-radius:0; transition:background var(--dur-fast) var(--ease), border-radius var(--dur-fast) var(--ease); }
.qcard-blank-input:focus + .blank-underline{ background:var(--accent); border-radius:var(--radius-pill); }
.qcard-blank-input.correct + .blank-underline{ background:var(--success); border-radius:var(--radius-pill); }
.qcard-blank-input.wrong + .blank-underline{ background:var(--danger); border-radius:var(--radius-pill); }
.qcard-blank-input.correct{ color:var(--success-strong); }
.qcard-blank-input.wrong{ color:var(--danger-strong); }

.qcard-body{ margin-top:26px; flex:1; min-height:0; display:flex; flex-direction:column; }
.qcard-body.choice-mode-body{ margin-top:30px; }
.qcard-body.per-blank-body{ margin-top:30px; flex:0 0 auto; }
.qcard-hint{ margin-top:auto; padding-top:18px; text-align:center; font-size:12px; color:var(--ink-faint); }

.reveal-divider{ margin:20px 0 16px; border:none; border-top:1.5px dashed var(--paper-line); }
.reveal-answer{ font-size:15.5px; line-height:1.85; color:var(--ink); white-space:pre-wrap; overflow-wrap:anywhere; word-break:break-word; }
.reveal-answer b{ color:var(--success-strong); }
.reveal-label{ font-size:11px; font-weight:700; letter-spacing:.06em; text-transform:uppercase; color:var(--ink-faint); margin-bottom:8px; }

/* 选择题 / 判断题 选项 */
.opt-list{ display:grid; grid-auto-rows:minmax(52px,1fr); align-items:stretch; gap:10px; margin-top:4px; }
.opt-list.opt-list-free{ display:flex; flex-direction:column; align-items:stretch; }
.opt-list:not(.opt-list-free) .opt-btn{ height:100%; }
.opt-btn{
  display:flex; align-items:flex-start; gap:12px; text-align:left; min-width:0;
  padding:13px 16px; border-radius:var(--radius-md);
  border:1.5px solid var(--paper-line); background:var(--surface-lift-1);
  color:var(--ink); font-size:15px; cursor:pointer;
  transition:all var(--dur-fast) var(--ease);
}
.opt-btn:hover{ border-color:var(--ink-faint); background:var(--surface-lift-2); }
.opt-btn .opt-key{
  width:24px;height:24px; border-radius:50%; background:var(--paper-alt); color:var(--ink-soft);
  display:flex; align-items:center; justify-content:center; font-size:12px; font-weight:700; flex-shrink:0; margin-top:1px;
}
.opt-btn .opt-text{ display:block; min-width:0; overflow-wrap:anywhere; word-break:break-word; line-height:1.5; }
.opt-btn.selected{ border-color:var(--accent); background:var(--accent-glow); }
.opt-btn.selected .opt-key{ background:var(--accent); color:var(--accent-ink); }
.opt-btn.correct{ border-color:var(--success); background:var(--success-bg); }
.opt-btn.correct .opt-key{ background:var(--success); color:#fff; }
.opt-btn.wrong{ border-color:var(--danger); background:var(--danger-bg); }
.opt-btn.wrong .opt-key{ background:var(--danger); color:#fff; }
.opt-btn:disabled{ cursor:default; }
.opt-btn:disabled:hover{ transform:none; }

.tf-row{ display:flex; gap:12px; margin-top:6px; }
.blank-choice-row{ display:flex; align-items:center; gap:12px; margin-bottom:12px; flex-wrap:wrap; }
.blank-choice-label{ font-size:12.5px; font-weight:700; color:var(--ink-soft); flex-shrink:0; min-width:40px; }
.blank-choice-opts{ display:flex; flex-wrap:wrap; gap:8px; }
.mini-opt-btn{
  padding:8px 14px; border-radius:var(--radius-pill); border:1.5px solid var(--paper-line);
  background:var(--surface-lift-1); color:var(--ink); font-size:13px; cursor:pointer;
  transition:all var(--dur-fast) var(--ease);
}
.mini-opt-btn:hover{ border-color:var(--ink-faint); background:var(--surface-lift-2); }
.mini-opt-btn.selected{ border-color:var(--accent); background:var(--accent-glow); font-weight:700; }
.mini-opt-btn.correct{ border-color:var(--success); background:var(--success-bg); color:var(--success-strong); font-weight:700; }
.mini-opt-btn.wrong{ border-color:var(--danger); background:var(--danger-bg); color:var(--danger-strong); }
.mini-opt-btn:disabled{ cursor:default; }
.tf-btn{ flex:1; padding:22px 10px; border-radius:var(--radius-md); border:1.5px solid var(--paper-line); background:var(--surface-lift-1); font-size:17px; font-weight:600; color:var(--ink); cursor:pointer; transition:all var(--dur-fast) var(--ease); text-align:center; }
.tf-btn .kbd{ opacity:.4; margin-left:6px; }
.tf-btn:hover{ background:var(--surface-lift-2); }
.tf-btn.selected{ border-color:var(--accent); background:var(--accent-glow); }
.tf-btn.correct{ border-color:var(--success); background:var(--success-bg); color:var(--success-strong); }
.tf-btn.wrong{ border-color:var(--danger); background:var(--danger-bg); color:var(--danger-strong); }

.essay-input{
  width:100%; min-height:130px; resize:vertical;
  border:1.5px solid var(--paper-line); border-radius:var(--radius-md);
  background:var(--surface-lift-1); color:var(--ink);
  padding:14px 16px; font-size:14.5px; line-height:1.7; outline:none;
  font-family:inherit;
}
.essay-input:focus{ border-color:var(--accent); background:var(--surface-lift-2); }
.essay-input::placeholder{ color:var(--ink-faint); }
.your-answer-box{ background:var(--surface-lift-1); border:1px solid var(--paper-line); border-radius:var(--radius-md); padding:14px 16px; font-size:14px; line-height:1.75; color:var(--ink-soft); white-space:pre-wrap; overflow-wrap:anywhere; word-break:break-word; }
.your-answer-box.correct{ background:var(--success-bg); border-color:color-mix(in srgb, var(--success) 42%, transparent); color:var(--success-strong); font-weight:700; }
.your-answer-box.wrong{ background:var(--danger-bg); border-color:color-mix(in srgb, var(--danger) 32%, transparent); color:var(--danger-strong); }

/* 卡片底部操作区 */
.qcard-actions{ margin-top:24px; display:flex; gap:12px; justify-content:flex-end; flex-wrap:wrap; }
.qcard-actions.center{ justify-content:center; }
.qcard-actions .self-eval-btn{ margin-right:auto; }

.rate-grid{ display:grid; grid-template-columns:repeat(4,1fr); gap:10px; margin-top:22px; }
.rate-btn{
  display:flex; flex-direction:column; align-items:center; gap:5px;
  padding:13px 6px; border-radius:var(--radius-md); border:none; cursor:pointer;
  font-size:13px; font-weight:700; color:#fff;
  transition:transform var(--dur-fast) var(--ease), filter var(--dur-fast) var(--ease);
}
.rate-btn:hover{ filter:brightness(1.08); transform:translateY(-2px); }
.rate-btn .kbd{ background:rgba(255,255,255,.25); opacity:1; }
.rate-btn .interval{ font-size:10.5px; font-weight:500; opacity:.85; font-family:var(--font-num); font-style:italic; }
.rate-again{ background:var(--danger); }
.rate-hard{ background:var(--gold); color:var(--gold-ink); }
.rate-hard .kbd{ background:rgba(0,0,0,.15); }
.rate-good{ background:var(--info); }
.rate-easy{ background:var(--success); }
.rate-easy .kbd{ background:rgba(0,0,0,.15); }

.flip-hint{ display:flex; align-items:center; justify-content:center; gap:10px; margin-top:26px; color:var(--ink-faint); font-size:12.5px; }
.flip-hint .kbd{ background:var(--surface-lift-2); color:var(--ink-soft); opacity:1; padding:3px 8px; min-width:auto; font-size:11px; }

/* 反馈浮层 */
.feedback-flash{
  position:fixed; top:22%; left:50%; transform:translate(-50%,-10px) scale(.8);
  padding:10px 22px; border-radius:var(--radius-pill); font-weight:700; font-size:15px;
  display:flex; align-items:center; gap:8px; z-index:100; opacity:0; pointer-events:none;
  box-shadow:0 12px 30px -8px rgba(0,0,0,.4);
}
.feedback-flash.show{ animation:flashPop .8s var(--ease); }
.feedback-flash.good{ background:var(--success); color:#fff; }
.feedback-flash.bad{ background:var(--danger); color:#fff; }
@keyframes flashPop{
  0%{ opacity:0; transform:translate(-50%,-4px) scale(.75); }
  18%{ opacity:1; transform:translate(-50%,0) scale(1.04); }
  30%{ transform:translate(-50%,0) scale(1); }
  78%{ opacity:1; }
  100%{ opacity:0; transform:translate(-50%,-6px) scale(.96); }
}

/* ============================================================
   9. 主观题自评 (打分阶段)
   ============================================================ */
.grade-progress{ text-align:center; font-size:12.5px; color:var(--text-faint); margin-bottom:8px; }
.grading-note{ margin-top:14px; color:var(--ink-faint); font-size:11.5px; line-height:1.6; text-align:center; }
.self-grade-grid{ display:grid; grid-template-columns:repeat(4,1fr); gap:10px; margin-top:20px; }
.sg-btn{
  border:none; border-radius:var(--radius-md); padding:14px 8px; cursor:pointer;
  display:flex; flex-direction:column; align-items:center; gap:4px; color:#fff; font-weight:700;
  transition:transform var(--dur-fast) var(--ease), filter var(--dur-fast) var(--ease);
}
.sg-btn:hover{ transform:translateY(-2px); filter:brightness(1.08); }
.sg-btn.selected{ box-shadow:0 0 0 3px var(--paper), 0 0 0 7px color-mix(in srgb, var(--accent) 42%, transparent); transform:translateY(-2px); }
.sg-btn .pct{ font-size:11px; font-weight:600; opacity:.9; font-family:var(--font-num); font-style:italic; }
.sg-0{ background:var(--danger); }
.sg-50{ background:var(--gold); color:var(--gold-ink); }
.sg-50 .kbd{ background:rgba(0,0,0,.15); }
.sg-80{ background:var(--info); color:#fff; }
.sg-100{ background:var(--success); }

/* ============================================================
   10. 结果报告
   ============================================================ */
.report-hero{ text-align:center; padding:36px 20px 14px; }
.report-hero .score-big{ font-family:var(--font-num); font-style:italic; font-size:76px; line-height:1; color:var(--accent); font-weight:600; }
.report-hero .score-big small{ font-size:28px; opacity:.6; font-style:normal; }
.report-hero .score-label{ margin-top:6px; font-size:14px; color:var(--text-soft); }
.report-stat-grid{ display:grid; grid-template-columns:repeat(4,1fr); gap:12px; margin:26px 0; }
@media (max-width:640px){ .report-stat-grid{ grid-template-columns:repeat(2,1fr); } }
.stat-card{ background:var(--bg-elevated); border:1px solid var(--border-soft); border-radius:var(--radius-md); padding:16px 14px; text-align:center; }
.stat-card .v{ font-family:var(--font-num); font-style:italic; font-size:24px; color:var(--text); }
.stat-card .l{ font-size:11.5px; color:var(--text-faint); margin-top:4px; }

.type-breakdown{ display:flex; flex-direction:column; gap:10px; margin:20px 0 26px; }
.tb-row{ display:flex; align-items:center; gap:12px; }
.tb-row .tb-label{ width:96px; font-size:12.5px; color:var(--text-soft); flex-shrink:0; }
.tb-row .tb-bar-track{ flex:1; height:10px; border-radius:var(--radius-pill); background:var(--bg-soft); overflow:hidden; }
.tb-row .tb-bar-fill{ height:100%; border-radius:var(--radius-pill); background:linear-gradient(90deg,var(--success-strong),var(--success)); transition:width var(--dur-slow) var(--ease); }
.tb-row .tb-pct{ width:74px; text-align:right; font-size:12px; color:var(--text-faint); font-family:var(--font-num); font-style:italic; flex-shrink:0; }

.qa-list{ display:flex; flex-direction:column; gap:9px; margin-top:8px; }
.qa-item{ border:1px solid var(--border-soft); border-radius:var(--radius-md); background:var(--bg-elevated); overflow:hidden; }
.qa-head{ display:flex; align-items:center; gap:11px; padding:13px 16px; cursor:pointer; user-select:none; }
.qa-head:focus-visible{ background:var(--bg-soft); outline:2px solid var(--accent); outline-offset:-2px; }
.qa-status{ width:20px;height:20px; border-radius:50%; display:flex; align-items:center; justify-content:center; font-size:11px; color:#fff; flex-shrink:0; }
.qa-status svg{ width:12px; height:12px; display:block; stroke:currentColor; stroke-width:2.6; stroke-linecap:round; }
.qa-status.ok{ background:var(--success); }
.qa-status.no{ background:var(--danger); }
.qa-status.mid{ background:var(--gold); color:var(--gold-ink); }
.qa-status.good{ background:var(--info); }
.qa-head .qa-q{ flex:1; font-size:13.5px; color:var(--text); overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
.qa-head .qa-score{ font-size:12px; color:var(--text-faint); font-family:var(--font-num); font-style:italic; flex-shrink:0; }
.qa-head .chev{ font-size:10px; color:var(--text-faint); transition:transform var(--dur) var(--ease); flex-shrink:0; }
.qa-item.open .chev{ transform:rotate(90deg); }
.qa-detail{ max-height:0; overflow:hidden; transition:max-height var(--dur-slow) var(--ease); }
.qa-item.open .qa-head .qa-q{ white-space:normal; overflow:visible; text-overflow:clip; line-height:1.55; }
.qa-item.open .qa-detail{ max-height:min(70vh,1200px); overflow:auto; }
.qa-detail-inner{ padding:0 16px 16px; font-size:13px; line-height:1.7; }
.qa-detail-inner .row{ margin-top:8px; }
.qa-detail-inner .k{ color:var(--text-faint); font-size:11px; text-transform:uppercase; letter-spacing:.05em; margin-bottom:3px; }
.qa-detail-inner .v{ color:var(--text-soft); white-space:pre-wrap; overflow-wrap:anywhere; word-break:break-word; }
.qa-detail-inner .v.ok{ color:var(--success-strong); }
.qa-detail-inner .v.no{ color:var(--danger-strong); }
.answer-fragments{ display:inline; }
.answer-part{ font-weight:800; }
.answer-part.ok{ color:var(--success-strong); }
.answer-part.no{ color:var(--danger-strong); }
.answer-sep{ color:var(--text-faint); font-weight:700; margin:0 .2em; }

.report-actions{ display:flex; gap:12px; margin-top:30px; flex-wrap:wrap; }
.report-actions .btn{ flex:1; min-width:140px; }

/* ============================================================
   11. 统计仪表盘
   ============================================================ */
.stats-grid{ display:grid; grid-template-columns:repeat(4,1fr); gap:12px; margin-bottom:26px; }
@media (max-width:640px){ .stats-grid{ grid-template-columns:repeat(2,1fr); } }
.big-stat{ background:var(--bg-elevated); border:1px solid var(--border-soft); border-radius:var(--radius-lg); padding:18px 16px; }
.big-stat .icon{ font-size:18px; margin-bottom:8px; display:block; }
.big-stat .v{ font-family:var(--font-num); font-style:italic; font-size:26px; color:var(--text); }
.big-stat .l{ font-size:11.5px; color:var(--text-faint); margin-top:3px; }

.chart-panel{ margin-bottom:22px; }
.chart-panel h4{ font-size:14px; color:var(--text); margin-bottom:14px; font-weight:600; font-family:inherit; }
.sparkline-scroll{ width:100%; overflow-x:auto; overflow-y:hidden; padding:2px 0 4px; }
.sparkline-scroll svg{ min-width:100%; }
.chart-empty{ font-size:13px; color:var(--text-faint); text-align:center; padding:30px 0; }

.history-table-wrap{ width:100%; max-height:620px; overflow:auto; -webkit-overflow-scrolling:touch; }
.history-table{ width:100%; min-width:720px; border-collapse:collapse; font-size:13px; }
.history-table th{ position:sticky; top:0; z-index:1; background:var(--bg); text-align:left; color:var(--text-faint); font-weight:600; font-size:11.5px; text-transform:uppercase; letter-spacing:.04em; padding:8px 10px; border-bottom:1px solid var(--border-soft); }
.history-table td{ padding:11px 10px; border-bottom:1px solid var(--border-soft); color:var(--text-soft); }
.history-table tr:last-child td{ border-bottom:none; }
.history-table .history-row{ cursor:pointer; transition:background var(--dur-fast) var(--ease); }
.history-table .history-row:hover,.history-table .history-row:focus-visible{ background:var(--bg-soft); }
.history-table .mode-tag-sm{ font-size:10.5px; padding:2px 8px; border-radius:var(--radius-pill); background:var(--bg-soft); color:var(--text-faint); font-weight:600; }
.history-table .history-context-cell{ max-width:280px; overflow:hidden; text-overflow:ellipsis; white-space:nowrap; color:var(--text); font-weight:600; }
.history-table .score-cell{ color:var(--text); font-weight:600; font-family:var(--font-num); font-style:italic; }
.record-preview-hint{ margin:-6px 0 10px; font-size:12.5px; }
.record-delete-btn{
  border:1px solid color-mix(in srgb, var(--danger) 35%, transparent); background:var(--danger-bg); color:var(--danger-strong);
  border-radius:var(--radius-pill); padding:6px 10px; font-size:11.5px; font-weight:800; cursor:pointer;
}
.record-delete-btn:hover{ background:color-mix(in srgb, var(--danger) 22%, transparent); }

.settings-actions{ display:flex; gap:10px; flex-wrap:wrap; margin-top:16px; }

/* ============================================================
   12. Toast / Modal
   ============================================================ */
#toast-root{ position:fixed; bottom:22px; left:50%; transform:translateX(-50%); z-index:200; display:flex; flex-direction:column; gap:8px; align-items:center; }
.toast{
  background:var(--bg-elevated); border:1px solid var(--border); color:var(--text);
  padding:11px 18px; border-radius:var(--radius-pill); font-size:13px; box-shadow:var(--shadow-pop);
  display:flex; align-items:center; gap:8px;
  animation:toastIn .3s var(--ease);
}
@keyframes toastIn{ from{ opacity:0; transform:translateY(10px); } to{ opacity:1; transform:none; } }
.toast.leaving{ animation:toastOut .25s var(--ease) forwards; }
@keyframes toastOut{ to{ opacity:0; transform:translateY(6px); } }

.modal-overlay{
  position:fixed; inset:0; background:rgba(0,0,0,.55); backdrop-filter:blur(3px);
  display:flex; align-items:center; justify-content:center; z-index:150; padding:20px;
  animation:overlayIn .2s var(--ease);
}
@keyframes overlayIn{ from{opacity:0} to{opacity:1} }
.modal-box{
  background:var(--bg-elevated); border:1px solid var(--border); border-radius:var(--radius-lg);
  padding:26px; max-width:420px; width:100%; max-height:calc(100vh - 40px); overflow:auto; box-shadow:var(--shadow-card);
  animation:modalIn .25s var(--ease-spring);
}
@keyframes modalIn{ from{ opacity:0; transform:scale(.92) translateY(8px); } to{ opacity:1; transform:none; } }
.modal-box h3{ font-size:17px; margin-bottom:10px; }
.modal-box p{ font-size:13.5px; color:var(--text-soft); line-height:1.7; margin:0 0 20px; }
.modal-actions{ display:flex; gap:10px; justify-content:flex-end; }

/* ============================================================
   13. 空状态 / 通用
   ============================================================ */
.empty-state{ text-align:center; padding:50px 20px; color:var(--text-faint); }
.empty-state .e-icon{ font-size:34px; margin-bottom:12px; display:block; opacity:.5; }
.empty-state p{ font-size:13.5px; }
.fade-in{ animation:fadeIn var(--dur) var(--ease); }
@keyframes fadeIn{ from{opacity:0; transform:translateY(6px);} to{opacity:1; transform:none;} }
.view-pad{ padding:28px 0 60px; }
.view-pad.has-fixed-previewbar{ padding-top:28px; }

/* ============================================================
   13b. 浏览整卷（原始顺序参考视图）
   ============================================================ */
.browse-topbar{
  display:grid; grid-template-columns:minmax(160px,1fr) auto minmax(160px,1fr); align-items:center; gap:14px;
  position:sticky; top:78px; z-index:32;
  background:color-mix(in srgb, var(--bg) 94%, transparent);
  backdrop-filter:blur(14px) saturate(1.15);
  padding:12px 0; margin-bottom:14px;
  border-bottom:none;
}
.browse-topbar .browse-answer-fixed{ justify-self:start; }
.browse-topbar #browse-back-btn{ justify-self:end; }
.browse-filter-pack{ display:flex; align-items:center; justify-content:center; gap:10px; min-width:0; flex-wrap:wrap; justify-self:center; }
.browse-filter-line{ display:flex; align-items:center; gap:8px; flex-wrap:nowrap; }
.browse-filter-line span{ color:var(--text-faint); font-size:12px; font-weight:700; }
.chapter-dropdown{ position:relative; }
.chapter-dropdown summary{
  list-style:none; display:flex; align-items:center; gap:8px; min-width:126px;
  border:1px solid var(--border); background:var(--bg-soft); color:var(--text-soft);
  border-radius:var(--radius-pill); padding:8px 12px; font-size:12.5px; font-weight:800; cursor:pointer;
}
.chapter-dropdown summary::-webkit-details-marker{ display:none; }
.chapter-dropdown summary span:first-child{ min-width:0; overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
.chapter-dropdown[open] summary{ border-color:var(--accent); color:var(--text); background:var(--accent-glow); }
.chapter-dropdown .chev{ margin-left:auto; font-size:10px; color:var(--text-faint); }
.chapter-clear-btn{
  border:1px solid var(--border); background:var(--bg-soft); color:var(--text-soft);
  border-radius:var(--radius-pill); padding:8px 12px; font-size:12.5px; font-weight:800; cursor:pointer;
}
.chapter-clear-btn:hover{ border-color:var(--accent); color:var(--text); background:var(--accent-glow); }
.chapter-menu{
  position:absolute; top:calc(100% + 8px); left:0; z-index:60; width:min(320px, calc(100vw - 40px)); max-height:300px; overflow:auto;
  background:var(--bg-elevated); border:1px solid var(--border); border-radius:18px; padding:8px; box-shadow:var(--shadow-pop);
}
.chapter-menu-action{
  width:100%; border:none; background:var(--accent); color:var(--accent-ink); border-radius:var(--radius-pill);
  padding:9px 12px; font-size:12px; font-weight:800; cursor:pointer; margin-bottom:6px;
}
.chapter-check{
  display:flex; align-items:center; gap:9px; padding:9px 10px; border-radius:12px; color:var(--text-soft);
  font-size:12.5px; font-weight:700; cursor:pointer;
}
.chapter-check:hover{ background:var(--bg-soft); color:var(--text); }
.chapter-check input{ accent-color:var(--accent); }
.chapter-check span{ min-width:0; overflow-wrap:anywhere; word-break:break-word; }
.browse-answer-fixed{
  display:flex; align-items:center; gap:10px; background:var(--bg-elevated); border:1px solid var(--border-soft);
  border-radius:var(--radius-pill); padding:8px 10px 8px 13px; box-shadow:var(--shadow-pop);
}
.wrong-test-strip{
  display:flex; align-items:center; justify-content:space-between; gap:14px; flex-wrap:wrap;
  margin:0 0 18px; padding:13px 15px; border:1px solid color-mix(in srgb, var(--danger) 26%, var(--border-soft));
  background:color-mix(in srgb, var(--danger-bg) 58%, var(--bg-elevated)); border-radius:var(--radius-md);
}
.wrong-test-strip > div{ min-width:0; flex:1 1 260px; }
.wrong-test-strip strong{ display:block; color:var(--text); font-size:13.5px; margin-bottom:2px; }
.wrong-test-strip span{ color:var(--text-soft); font-size:12.5px; line-height:1.6; overflow-wrap:anywhere; word-break:break-word; }
.wrong-test-strip .btn{ flex-shrink:0; }
.browse-shell{ display:flex; gap:24px; align-items:flex-start; }
.browse-main{ flex:1; min-width:0; }
.browse-nav-toggle{ display:none; }
.browse-sidebar{
  width:230px; flex-shrink:0; position:sticky; top:156px; max-height:calc(100vh - 180px); overflow:auto;
  background:var(--bg-elevated); border:1px solid var(--border-soft); border-radius:var(--radius-lg); padding:16px;
}
.browse-shell > .browse-sidebar{ order:-1; }
.mobile-nav-dropdown{ display:none; }
.browse-sidebar h5{ font-size:11.5px; color:var(--text-faint); text-transform:uppercase; letter-spacing:.05em; margin:16px 0 9px; font-weight:700; }
.browse-sidebar h5:first-child{ margin-top:0; }
.sidebar-legend{ display:flex; flex-wrap:wrap; gap:8px; margin-bottom:12px; font-size:11px; color:var(--text-faint); }
.sidebar-legend span{ display:flex; align-items:center; gap:4px; }
.sidebar-legend i{ width:10px; height:10px; border-radius:3px; border:1px solid var(--border-soft); display:inline-block; }
.nav-grid{ display:flex; flex-wrap:wrap; gap:5px; padding:3px; }
.nav-cell{
  width:26px;height:26px; border-radius:7px; background:var(--bg-soft); border:1px solid var(--border-soft);
  font-size:12px; line-height:1; font-weight:600; display:flex; align-items:center; justify-content:center; color:var(--text-soft);
  cursor:pointer; text-decoration:none; transition:all .15s ease; font-family:var(--font-num);
}
.nav-cell-num{ display:block; line-height:1; transform:translateY(.5px); }
.nav-chapter-label{ display:none; }
.nav-cell:hover{ transform:scale(1.15); filter:brightness(1.08); }
.nav-cell:not(.status-ok):not(.status-good):not(.status-mid):not(.status-no):not(.status-empty):hover,
.nav-cell:not(.status-ok):not(.status-good):not(.status-mid):not(.status-no):not(.status-empty).active{
  background:var(--accent); color:var(--accent-ink); border-color:var(--accent);
}
.nav-cell.active{ box-shadow:0 0 0 2px var(--accent); }
.sidebar-legend i.status-ok,.nav-cell.status-ok{ background:var(--success); border-color:var(--success); color:#fff; }
.sidebar-legend i.status-good,.nav-cell.status-good{ background:var(--info); border-color:var(--info); color:#fff; }
.sidebar-legend i.status-mid,.nav-cell.status-mid{ background:var(--gold); border-color:var(--gold); color:var(--gold-ink); }
.sidebar-legend i.status-no,.nav-cell.status-no{ background:var(--danger); border-color:var(--danger); color:#fff; }
.sidebar-legend i.status-empty,.nav-cell.status-empty{ background:var(--bg-soft); border-color:var(--border-soft); color:var(--text-faint); }
.sidebar-legend i.status-unanswered,.nav-cell.status-unanswered{ background:var(--success-bg); border-color:color-mix(in srgb, var(--success) 30%, transparent); color:var(--success-strong); }
.browse-section{ margin-bottom:32px; }
.browse-section h3{ font-size:15.5px; color:var(--text); margin-bottom:14px; padding-bottom:10px; border-bottom:1px solid var(--border-soft); font-family:inherit; font-weight:700; }
.browse-q{ margin-bottom:18px; padding-bottom:16px; border-bottom:1px solid var(--border-soft); scroll-margin-top:148px; }
.browse-q.with-status{ border-left:4px solid var(--border-soft); padding-left:14px; }
.browse-q.status-ok{ border-left-color:var(--success); }
.browse-q.status-mid{ border-left-color:var(--gold); }
.browse-q.status-good{ border-left-color:var(--info); }
.browse-q.status-unanswered{ border-left-color:color-mix(in srgb, var(--success) 30%, transparent); }
.browse-q.status-no{ border-left-color:var(--danger); }
.browse-q:last-child{ border-bottom:none; }
.browse-q-num{ font-family:var(--font-num); font-style:italic; color:var(--accent); font-weight:600; margin-right:6px; }
.browse-q-text{ min-width:0; font-size:15px; color:var(--text); line-height:1.7; overflow-wrap:anywhere; word-break:break-word; }
.preview-q-head{ display:flex; align-items:flex-start; gap:12px; justify-content:space-between; }
.preview-actions{ display:flex; align-items:center; gap:8px; flex-shrink:0; }
.mini-remove-btn{
  border:1px solid color-mix(in srgb, var(--danger) 35%, transparent); background:var(--danger-bg); color:var(--danger-strong);
  border-radius:var(--radius-pill); padding:6px 9px; font-size:11px; font-weight:800; cursor:pointer;
}
.preview-meta{ display:flex; align-items:center; flex-wrap:wrap; gap:7px; margin-top:7px; color:var(--text-faint); font-size:11.5px; }
.chapter-pill,.preview-status{
  display:inline-flex; align-items:center; border-radius:var(--radius-pill); padding:3px 8px; background:var(--bg-soft); color:var(--text-faint); font-weight:700;
}
.preview-score{ display:inline-flex; align-items:center; min-height:calc(1em + 6px); }
.preview-status.ok{ background:var(--success-bg); color:var(--success-strong); }
.preview-status.mid{ background:var(--gold-bg); color:var(--gold); }
.preview-status.good{ background:var(--info-bg); color:var(--info); }
.preview-status.unanswered{ background:var(--success-bg); color:var(--success-strong); }
.preview-status.no{ background:var(--danger-bg); color:var(--danger-strong); }
.browse-q-opts{ margin-top:8px; padding-left:22px; font-size:13.5px; color:var(--text-soft); line-height:1.85; overflow-wrap:anywhere; word-break:break-word; }
.browse-q-opts .opt-row{ border-radius:8px; padding:2px 6px; overflow-wrap:anywhere; word-break:break-word; }
.browse-q-opts .opt-row.is-correct{ color:var(--success-strong); font-weight:600; background:var(--success-bg); }
.browse-q-opts .opt-row.is-wrong{ color:var(--danger-strong); background:var(--danger-bg); }
.browse-q-opts .opt-row.is-picked{ font-weight:700; }
.browse-answer{ margin-top:8px; padding:10px 14px; background:var(--success-bg); border-radius:var(--radius-sm); color:var(--success-strong); font-size:13px; line-height:1.7; white-space:pre-wrap; overflow-wrap:anywhere; word-break:break-word; }
.browse-blank-line{ display:inline-block; width:86px; border-bottom:2px solid var(--text-faint); height:1em; vertical-align:-4px; margin:0 3px; }
.browse-inline-answer{
  display:inline-block; min-width:86px; min-height:1.2em; padding:0 7px 1px; margin:0 3px; border-bottom:2px solid var(--success);
  color:var(--success-strong); background:transparent; font-weight:800; line-height:1.2; text-align:center; vertical-align:baseline;
}
.tf-mini-row{ display:flex; gap:8px; margin-top:10px; }
.tf-mini{ flex:0 0 auto; padding:8px 14px; border-radius:var(--radius-pill); background:var(--bg-soft); color:var(--text-soft); font-size:13px; }
.tf-mini.is-correct{ background:var(--success-bg); color:var(--success-strong); font-weight:800; }
.tf-mini.is-wrong{ background:var(--danger-bg); color:var(--danger-strong); font-weight:800; }
.preview-user-line{ margin-top:9px; padding:8px 12px; border-radius:var(--radius-sm); font-size:13px; overflow-wrap:anywhere; word-break:break-word; }
.preview-user-line.ok{ background:var(--success-bg); color:var(--success-strong); }
.preview-user-line.mid{ background:var(--gold-bg); color:var(--gold); }
.preview-user-line.good{ background:var(--info-bg); color:var(--info); }
.preview-user-line.unanswered{ background:var(--success-bg); color:var(--success-strong); }
.preview-user-line.no{ background:var(--danger-bg); color:var(--danger-strong); }
.record-topbar{
  display:grid; grid-template-columns:minmax(160px,1fr) auto minmax(160px,1fr); align-items:center; gap:14px; position:sticky; top:78px; z-index:32;
  background:color-mix(in srgb, var(--bg) 94%, transparent);
  backdrop-filter:blur(14px) saturate(1.15);
  padding:12px 0; border-bottom:none; margin-bottom:18px;
}
.record-topbar .browse-answer-fixed{ justify-self:start; }
.record-topbar #record-back-btn{ justify-self:end; }
.record-title{ min-width:0; max-width:min(560px,52vw); text-align:center; justify-self:center; }
.record-title h2{ font-size:18px; color:var(--text); overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
.record-title p{ margin:4px 0 0; color:var(--text-faint); font-size:12.5px; }
.record-mobile-title{ display:none; }
.record-paper .browse-q{ scroll-margin-top:148px; }
.history-date-cell span{ display:inline; }
.history-date-cell span + span::before{ content:" "; }
@media (max-width:900px){
  .browse-shell{ flex-direction:column; }
  .browse-sidebar{ width:100%; position:static; max-height:none; order:-1; }
  .nav-grid{ max-height:140px; overflow-y:auto; }
}

/* ============================================================
   14. 响应式
   ============================================================ */
@media (max-width:640px){
  .topnav{
    position:relative;
    display:flex; align-items:center; justify-content:space-between;
    padding:10px 12px; gap:8px;
    min-height:48px;
  }
  .brand{ font-size:14px; gap:0; margin-right:0; }
  .brand .brand-text{ display:none; }
  .nav-spacer{ display:none; }
  .format-guide-grid{ grid-template-columns:1fr; }
  .streak-pill{ padding:5px 9px 5px 7px; font-size:12px; }
  .streak-pill.streak-placeholder{ display:none; visibility:hidden; }
  .nav-tabs{
    position:absolute;
    left:50%;
    top:50%;
    transform:translate(-50%, -50%);
    width:max-content;
    max-width:calc(100vw - 132px);
    justify-content:center;
    z-index:1;
  }
  .nav-tab{ padding:7px 12px; }
  .icon-btn{ position:relative; z-index:2; margin-left:auto; }
  .topnav.has-streak{
    display:grid; grid-template-columns:auto auto auto auto; justify-content:space-between;
    gap:0;
  }
  .topnav.has-streak .brand{ grid-column:1; }
  .topnav.has-streak .streak-pill{ grid-column:2; justify-self:start; }
  .topnav.has-streak .nav-tabs{
    grid-column:3; position:static; transform:none; max-width:100%; justify-self:center;
  }
  .topnav.has-streak .icon-btn{ grid-column:4; position:relative; margin-left:0; justify-self:end; }
  .topnav.preview-fixed{
    position:fixed; left:0; right:0; top:0; z-index:90;
  }
  .topnav.preview-fixed + main#view{
    padding-top:76px;
  }
  .container{ padding:0 14px; }
  .setup-container{ display:flex; flex-direction:column; padding-bottom:28px; }
  .setup-container .deck-info-card{ order:1; }
  .setup-container .deck-switcher,.setup-container .deck-switch-select{ order:2; }
  .setup-container > .section-title{ order:3; }
  .setup-container .mode-grid{ order:4; }
  .setup-container .start-bar{ order:5; }
  .setup-container .setup-grid{ order:6; }
  .setup-container .adv-panel{ order:7; }
  .mode-grid{ grid-template-columns:repeat(3,minmax(0,1fr)); gap:8px; margin-bottom:16px; }
  .mode-card{ padding:12px 8px 10px; text-align:center; border-radius:var(--radius-md); }
  .mode-card .mode-icon{ font-size:20px; margin-bottom:6px; }
  .mode-card h4{ font-size:13px; margin-bottom:0; white-space:nowrap; }
  .mode-card p,.mode-card .mode-tag{ display:none; }
  .sg-btn .kbd{ display:none; }
  .mobile-collapse-head{
    display:flex; align-items:center; justify-content:space-between; width:100%;
    border:none; background:transparent; color:var(--text); padding:0; font-size:14px; font-weight:800; cursor:pointer;
  }
  .mobile-collapse-head .chev{ color:var(--text-faint); transition:transform var(--dur-fast) var(--ease); }
  .setup-panel .mobile-collapse-body{ display:none; margin-top:14px; }
  .setup-panel.open .mobile-collapse-body{ display:block; }
  .setup-panel.open .mobile-collapse-head .chev{ transform:rotate(90deg); }
  .setup-panel .mobile-collapse-body > .section-title:first-child{ display:none; }
  .start-bar{ flex-direction:column; align-items:stretch; gap:10px; margin-top:0; margin-bottom:22px; padding:0 0 6px; border-top:none; overflow:visible; }
  .start-bar .est{ text-align:center; }
  .start-bar .btn-lg{ margin-bottom:3px; }
  #start-btn.is-empty:disabled{
    opacity:1; box-shadow:none; transform:none;
    background:var(--bg-soft); color:var(--text-faint);
    border:1px solid var(--border-soft);
    cursor:not-allowed;
  }
  .deck-switcher{ flex-wrap:nowrap; overflow-x:auto; max-height:none; padding:0 2px 8px; margin:-10px 0 18px; scroll-snap-type:x proximity; }
  .deck-switcher button{ flex:0 0 calc((100% - 16px)/3); max-width:none; justify-content:center; scroll-snap-align:start; }
  .deck-switcher.too-many{ display:none; }
  .deck-switch-select.too-many{ display:block; margin:-10px 0 18px; }
  .quiz-shell{ min-height:calc(100dvh - 62px); padding-bottom:env(safe-area-inset-bottom, 0px); }
  .card-stage{ padding-bottom:calc(92px + env(safe-area-inset-bottom, 0px)); }
  .qcard{ padding:26px 20px 24px; min-height:260px; }
  .qcard-actions{ padding-bottom:env(safe-area-inset-bottom, 0px); }
  .essay-input,.qcard-blank-input{ scroll-margin-bottom:calc(140px + env(safe-area-inset-bottom, 0px)); }
  .qcard-question{ font-size:18px; }
  .qcard-question .blank{ width:76px; }
  .blank-line-only{ width:74px; }
  .blank-wrap{ width:max(104px, calc(var(--blank-chars, 6) * 1.05em + 22px)); }
  .rate-grid{ gap:7px; }
  .rate-btn{ font-size:11.5px; padding:11px 4px; }
  .rate-btn .kbd{ display:none; }
  .report-hero .score-big{ font-size:56px; }
  .qa-list .qa-item:not(.open) .qa-detail{ max-height:0; }
  .deck-info-card{ flex-wrap:wrap; gap:12px; }
  .deck-info-card > div{ flex:1 1 calc(100% - 52px); }
  .deck-info-card #browse-deck-btn,.deck-info-card .swap{ flex:1 1 calc(50% - 6px); margin-left:0; }
  .self-grade-grid{ grid-template-columns:repeat(2,1fr); }
  .browse-topbar{
    display:flex;
    top:61px;
    align-items:center; justify-content:center;
    padding:10px 14px 12px; margin-bottom:14px; border-bottom:none;
    overflow:visible; background:transparent; backdrop-filter:none;
  }
  .view-pad.has-fixed-previewbar{ padding-top:28px; }
  .view-pad.has-fixed-previewbar.fade-in{ animation:none; }
  .browse-filter-pack{
    flex:0 1 auto; min-width:0; width:100%;
    justify-content:center; gap:8px;
  }
  .browse-filter-pack > .seg{
    max-width:100%; margin:0 auto; justify-content:center;
    box-shadow:0 8px 20px -16px rgba(0,0,0,.45);
  }
  .browse-filter-pack > .seg button{
    flex:0 0 auto; padding:7px 12px; white-space:nowrap;
  }
  .record-topbar{
    display:flex;
    top:61px; align-items:flex-start; flex-wrap:wrap;
    background:transparent; backdrop-filter:none;
  }
  .record-topbar .record-title{ display:none; }
  .record-mobile-title{
    display:block; margin:0 0 16px; padding:0 2px;
  }
  .record-mobile-title h2{
    font-size:17px; line-height:1.45; color:var(--text);
    white-space:normal; display:-webkit-box; -webkit-line-clamp:2; -webkit-box-orient:vertical; overflow:hidden;
  }
  .record-mobile-title p{ margin:5px 0 0; color:var(--text-faint); font-size:12.5px; line-height:1.5; }
  .stats-grid{ gap:8px; margin-bottom:16px; }
  .big-stat{ border-radius:var(--radius-md); padding:12px 10px; }
  .big-stat .icon{ font-size:15px; margin-bottom:5px; }
  .big-stat .v{ font-size:21px; }
  .big-stat .l{ font-size:10.5px; line-height:1.25; }
  .settings-actions{ flex-wrap:nowrap; gap:6px; }
  .settings-actions .btn{ flex:1 1 0; min-width:0; padding:10px 8px; font-size:12px; white-space:nowrap; }
  .browse-topbar .browse-answer-fixed,
  .record-topbar .browse-answer-fixed{
    position:fixed; right:14px; bottom:calc(14px + env(safe-area-inset-bottom, 0px));
    z-index:170; margin:0; padding:8px 10px 8px 12px;
    box-shadow:var(--shadow-pop);
  }
  .wrong-test-strip{ justify-content:center; text-align:center; }
  .wrong-test-strip > div{ flex:1 1 100%; }
  .wrong-test-strip .btn{ margin:0 auto; }
  .browse-filter-line,#browse-back-btn{ display:none; }
  .browse-shell{ padding-bottom:76px; }
  .browse-nav-toggle{
    display:flex; position:fixed; left:14px; bottom:calc(14px + env(safe-area-inset-bottom, 0px)); z-index:171;
    justify-content:center; margin:0; padding:10px 14px; border-radius:var(--radius-pill);
    box-shadow:var(--shadow-pop);
  }
  .browse-sidebar{
    order:-1; width:100%; max-height:min(42vh,360px); overflow:auto;
    border-radius:var(--radius-md); padding:12px; box-shadow:var(--shadow-pop);
  }
  .mobile-nav-dropdown{
    display:block; position:fixed; left:14px; right:14px; bottom:calc(66px + env(safe-area-inset-bottom, 0px)); z-index:169;
    width:auto; max-width:calc(100vw - 28px); box-sizing:border-box;
    max-height:min(58vh,460px); margin:0; text-align:left;
    animation:navDrawerUp .18s var(--ease);
  }
  @keyframes navDrawerUp{ from{ opacity:0; transform:translateY(16px); } to{ opacity:1; transform:none; } }
  .browse-shell > .browse-sidebar{ display:none; }
  .browse-sidebar .nav-grid{ max-height:none; overflow:visible; padding:5px; max-width:100%; box-sizing:border-box; }
  .browse-sidebar .nav-cell{ width:30px; height:30px; border-radius:9px; }
  .mobile-nav-dropdown.show-chapters .nav-chapter-label{
    display:block; flex:1 0 100%; margin:8px 0 2px;
    color:var(--text-faint); font-size:11.5px; font-weight:800;
  }
  .mobile-nav-dropdown.show-chapters .nav-chapter-label:first-child{ margin-top:0; }
  .browse-main{ order:0; width:100%; }
  .browse-blank-line{ width:76px; }
  .browse-inline-answer{ min-width:76px; }
  .browse-sidebar.mobile-collapsed{ display:none; }
  .browse-main .empty-state{ display:flex; flex-direction:column; align-items:center; justify-content:center; width:100%; min-height:46vh; margin:0 auto; }
  .chart-panel{ padding:16px 14px; min-height:0; overflow:visible; }
  .chart-panel h4{ margin-bottom:10px; }
  .trend-chart-panel{ --sparkline-h:168px; padding:16px 14px 12px; }
  .trend-chart-panel .sparkline-scroll{
    margin:0 -2px; padding:0 2px;
    height:var(--sparkline-h); max-height:var(--sparkline-h); line-height:0;
    box-sizing:border-box;
    -webkit-overflow-scrolling:touch;
  }
  .trend-chart-panel svg.sparkline-chart{
    height:var(--sparkline-h) !important; min-height:0; max-height:none;
    aspect-ratio:auto !important; display:block;
  }
  .trend-chart-panel svg.sparkline-chart text{ font-size:20px !important; font-weight:800; }
  .trend-chart-panel svg.sparkline-chart .sparkline-line{ stroke-width:5.5 !important; }
  .trend-chart-panel svg.sparkline-chart .sparkline-dot{ r:6.5px; }
  .tb-row{ gap:8px; }
  .tb-row .tb-label{ width:64px; font-size:12px; }
  .tb-row .tb-pct{ width:48px; font-size:11.5px; }
  .history-table-wrap{ max-height:min(58vh,460px); margin:0 -2px; padding:0 2px 8px; }
  .history-table{ min-width:680px; }
  .history-table th,.history-table td{ white-space:nowrap; padding:10px 8px; }
  .history-table .history-context-cell{ max-width:min(58vw,260px); }
  .history-date-cell span{ display:inline; }
  .history-date-cell span + span::before{ content:""; display:block; }
  .qcard-tools{ top:18px; right:20px; }
  .qcard-type{ padding-right:104px; }
  .modal-actions{ flex-direction:column; }
  .modal-actions .btn{ width:100%; }
  .toast{ max-width:calc(100vw - 28px); justify-content:center; text-align:center; }
}