/* ============================================================
   EL ARENA · 依视路 EL 专业知识赛 刷题系统
   深墨 / 极光 / 玻璃拟态 / 宋体标题
   纯本地，无外部依赖
   ============================================================ */

:root {
  /* 底色 — 深墨夜空 */
  --ink-900: #05070e;
  --ink-800: #080c16;
  --ink-700: #0b1120;
  --ink-600: #101828;

  /* 极光主色 */
  --aur-teal: #2dd4bf;
  --aur-cyan: #38bdf8;
  --aur-violet: #a78bfa;
  --aur-gold: #d9b169;
  --aur-jade: #7dd3a0;

  /* 语义 */
  --ok: #34d399;
  --err: #fb7185;
  --warn: #fbbf24;
  --info: #60a5fa;

  /* 文本 */
  --tx-1: #e9eefb;
  --tx-2: #9dabc7;
  --tx-3: #64748b;

  /* 玻璃 */
  --glass: rgba(255, 255, 255, 0.035);
  --glass-2: rgba(255, 255, 255, 0.055);
  --edge: rgba(255, 255, 255, 0.09);
  --edge-hi: rgba(255, 255, 255, 0.16);

  --r-sm: 10px;
  --r-md: 16px;
  --r-lg: 22px;

  --serif: "Songti SC", "STSong", "Source Han Serif SC", "Noto Serif CJK SC", serif;
  --sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
  --mono: "SF Mono", "JetBrains Mono", ui-monospace, Menlo, monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body { height: 100%; }

body {
  font-family: var(--sans);
  background: var(--ink-900);
  color: var(--tx-1);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  line-height: 1.6;
}

/* ────────────背景层：极光 + 星野 + 网格 ──────────── */
.bg { position: fixed; inset: 0; z-index: 0; overflow: hidden; pointer-events: none; }

.bg-base {
  position: absolute; inset: 0;
  background:
    radial-gradient(ellipse 90% 60% at 20% -10%, rgba(45, 212, 191, 0.13), transparent 60%),
    radial-gradient(ellipse 80% 55% at 85% 5%, rgba(167, 139, 250, 0.12), transparent 62%),
    radial-gradient(ellipse 100% 70% at 50% 110%, rgba(56, 189, 248, 0.10), transparent 65%),
    linear-gradient(180deg, var(--ink-900) 0%, var(--ink-800) 45%, var(--ink-900) 100%);
}

/* 极光飘带
   注意：不要用 mix-blend-mode: screen —— 它与 backdrop-filter、
   大面积动画模糊层叠加时，会让 Chromium 的命中测试慢到点不动。
   质感改用预混色 + 降不透明度实现，视觉几乎等价，成本极低。 */
.aurora {
  position: absolute;
  width: 160%; height: 620px;
  left: -30%; top: -180px;
  filter: blur(58px);
  opacity: .34;
  will-change: transform;
}
.aurora.a1 {
  background: radial-gradient(ellipse 42% 46% at 28% 50%, rgba(45, 212, 191, .6), transparent 66%),
              radial-gradient(ellipse 34% 38% at 62% 44%, rgba(56, 189, 248, .44), transparent 68%);
  animation: drift1 34s ease-in-out infinite;
}
.aurora.a2 {
  background: radial-gradient(ellipse 38% 40% at 72% 46%, rgba(167, 139, 250, .52), transparent 66%),
              radial-gradient(ellipse 30% 34% at 40% 56%, rgba(217, 177, 105, .24), transparent 70%);
  animation: drift2 46s ease-in-out infinite;
  opacity: .24;
}

@keyframes drift1 {
  0%, 100% { transform: translate3d(0, 0, 0) scale(1); }
  50%      { transform: translate3d(6%, 40px, 0) scale(1.12); }
}
@keyframes drift2 {
  0%, 100% { transform: translate3d(0, 0, 0) scale(1.06); }
  50%      { transform: translate3d(-7%, -34px, 0) scale(1); }
}

/* 星野 */
.stars, .stars2 { position: absolute; inset: 0; }
.stars {
  background-image:
    radial-gradient(1.2px 1.2px at 18% 24%, rgba(255,255,255,.85), transparent),
    radial-gradient(1px 1px at 42% 12%, rgba(255,255,255,.6), transparent),
    radial-gradient(1.4px 1.4px at 68% 30%, rgba(255,255,255,.75), transparent),
    radial-gradient(1px 1px at 82% 16%, rgba(255,255,255,.5), transparent),
    radial-gradient(1.1px 1.1px at 30% 62%, rgba(255,255,255,.55), transparent),
    radial-gradient(1px 1px at 58% 72%, rgba(255,255,255,.7), transparent),
    radial-gradient(1.3px 1.3px at 88% 58%, rgba(255,255,255,.6), transparent),
    radial-gradient(1px 1px at 12% 84%, rgba(255,255,255,.45), transparent),
    radial-gradient(1.1px 1.1px at 74% 88%, rgba(255,255,255,.55), transparent),
    radial-gradient(1px 1px at 92% 40%, rgba(255,255,255,.5), transparent);
  animation: twinkle 7s ease-in-out infinite;
}
.stars2 {
  background-image:
    radial-gradient(1px 1px at 24% 44%, rgba(255,255,255,.4), transparent),
    radial-gradient(1.2px 1.2px at 52% 22%, rgba(255,255,255,.45), transparent),
    radial-gradient(1px 1px at 66% 52%, rgba(255,255,255,.4), transparent),
    radial-gradient(1px 1px at 8% 12%, rgba(255,255,255,.35), transparent),
    radial-gradient(1.1px 1.1px at 96% 72%, rgba(255,255,255,.4), transparent);
  animation: twinkle 11s ease-in-out infinite reverse;
}
@keyframes twinkle { 0%,100% { opacity: .35; } 50% { opacity: .9; } }

/* 细网格 */
.grid-lines {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,.022) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.022) 1px, transparent 1px);
  background-size: 68px 68px;
  mask-image: radial-gradient(ellipse 80% 70% at 50% 40%, #000 25%, transparent 78%);
  -webkit-mask-image: radial-gradient(ellipse 80% 70% at 50% 40%, #000 25%, transparent 78%);
}

/* 胶片颗粒 —— 压住渐变断层，提升质感
   必须静态：动画会让这层每帧重栅格化，直接拖垮交互命中 */
.grain {
  position: absolute; inset: 0;
  opacity: .035; pointer-events: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 120px 120px;
}

/* 顶部光晕 */
.glow-top {
  position: absolute; top: -140px; left: 50%; transform: translateX(-50%);
  width: 720px; height: 300px; pointer-events: none;
  background: radial-gradient(ellipse 50% 50% at 50% 50%, rgba(56,189,248,.13), transparent 70%);
  filter: blur(40px);
}

/* ────────────布局 ──────────── */
.shell { position: relative; z-index: 1; display: flex; min-height: 100vh; }

/* 侧栏 */
.side {
  width: 232px; flex-shrink: 0;
  padding: 26px 16px;
  border-right: 1px solid var(--edge);
  background: linear-gradient(180deg, rgba(8,12,22,.72), rgba(5,7,14,.5));
  backdrop-filter: blur(22px); -webkit-backdrop-filter: blur(22px);
  display: flex; flex-direction: column; gap: 6px;
  position: sticky; top: 0; height: 100vh;
}

.brand { padding: 4px 10px 22px; }
.brand-mark {
  display: flex; align-items: center; gap: 10px; margin-bottom: 8px;
}
.brand-glyph {
  width: 34px; height: 34px; flex-shrink: 0;
  border-radius: 10px;
  display: grid; place-items: center;
  font-family: var(--serif); font-size: 16px; font-weight: 600;
  color: var(--ink-900);
  background: linear-gradient(140deg, var(--aur-teal), var(--aur-cyan) 45%, var(--aur-violet));
  box-shadow: 0 0 22px rgba(56,189,248,.4), inset 0 1px 0 rgba(255,255,255,.35);
}
.brand-name {
  font-family: var(--serif); font-size: 19px; letter-spacing: .1em;
  background: linear-gradient(100deg, #fff, var(--aur-teal) 55%, var(--aur-cyan));
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.brand-sub { font-size: 10.5px; color: var(--tx-3); letter-spacing: .22em; text-transform: uppercase; padding-left: 44px; }

.nav-item {
  display: flex; align-items: center; gap: 11px;
  padding: 10px 13px; border-radius: var(--r-sm);
  color: var(--tx-2); font-size: 13.5px; cursor: pointer;
  border: 1px solid transparent;
  transition: all .22s cubic-bezier(.4,0,.2,1);
  user-select: none; position: relative;
}
.nav-item:hover { color: var(--tx-1); background: var(--glass); }
.nav-item.on {
  color: #fff; background: var(--glass-2);
  border-color: var(--edge-hi);
  box-shadow: 0 4px 18px rgba(0,0,0,.35), inset 0 1px 0 rgba(255,255,255,.07);
}
.nav-item.on::before {
  content: ''; position: absolute; left: -16px; top: 50%; transform: translateY(-50%);
  width: 3px; height: 18px; border-radius: 0 3px 3px 0;
  background: linear-gradient(180deg, var(--aur-teal), var(--aur-violet));
  box-shadow: 0 0 10px var(--aur-teal);
}
.nav-ico { width: 17px; text-align: center; opacity: .9; font-size: 14px; }
.nav-badge {
  margin-left: auto; font-size: 10.5px; padding: 1px 7px; border-radius: 20px;
  background: rgba(251,113,133,.16); color: var(--err);
  border: 1px solid rgba(251,113,133,.3);
  font-variant-numeric: tabular-nums;
}
.nav-badge.calm { background: rgba(217,177,105,.14); color: var(--aur-gold); border-color: rgba(217,177,105,.28); }

.side-foot { margin-top: auto; padding: 14px 12px 0; border-top: 1px solid var(--edge); }
.streak-num { font-family: var(--serif); font-size: 26px; color: var(--aur-gold); line-height: 1; }
.streak-lbl { font-size: 10.5px; color: var(--tx-3); letter-spacing: .1em; }

/* 主区 */
.main { flex: 1; min-width: 0; padding: 30px 34px 60px; max-width: 1220px; }

/* ────────────通用玻璃卡 ──────────── */
.card {
  background:
    linear-gradient(160deg, rgba(255,255,255,.052), rgba(255,255,255,.018) 42%, rgba(255,255,255,.008));
  border: 1px solid var(--edge);
  border-radius: var(--r-lg);
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  box-shadow:
    0 1px 0 rgba(255,255,255,.07) inset,
    0 -1px 0 rgba(0,0,0,.25) inset,
    0 14px 44px rgba(0,0,0,.42),
    0 2px 8px rgba(0,0,0,.3);
  position: relative; overflow: hidden;
  transition: border-color .3s cubic-bezier(.4,0,.2,1), box-shadow .3s;
}
/* 顶部一道高光，模拟玻璃边缘折射 */
.card::before {
  content: ''; position: absolute; top: 0; left: 12%; right: 12%; height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,.28), transparent);
}
.card:hover { border-color: var(--edge-hi); }
.card-hd {
  padding: 17px 22px 14px;
  border-bottom: 1px solid var(--edge);
  display: flex; align-items: center; gap: 12px;
  position: relative;
}
.card-hd h3 { font-family: var(--serif); font-size: 15.5px; font-weight: 500; letter-spacing: .06em; }
.card-bd { padding: 20px 22px; }

.hairline { height: 1px; background: linear-gradient(90deg, transparent, var(--edge-hi), transparent); }

/* 章节标题 */
.sec-title {
  font-family: var(--serif); font-size: 27px; font-weight: 500; letter-spacing: .05em;
  background: linear-gradient(100deg, #fff 10%, var(--aur-cyan) 60%, var(--aur-violet));
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
  margin-bottom: 5px;
}
.sec-sub { color: var(--tx-3); font-size: 12.5px; letter-spacing: .08em; margin-bottom: 22px; }

/* ────────────仪表盘 ──────────── */
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(158px,1fr)); gap: 13px; margin-bottom: 20px; }

.stat {
  background: var(--glass); border: 1px solid var(--edge); border-radius: var(--r-md);
  padding: 16px 18px; position: relative; overflow: hidden;
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  transition: transform .25s cubic-bezier(.4,0,.2,1), border-color .25s;
}
.stat:hover { transform: translateY(-3px); border-color: var(--edge-hi); }
.stat::after {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px;
  background: linear-gradient(90deg, var(--aur-teal), var(--aur-violet));
  opacity: .55;
}
.stat-v {
  font-family: var(--serif); font-size: 31px; line-height: 1.1;
  font-variant-numeric: tabular-nums;
}
.stat-v small { font-size: 14px; color: var(--tx-3); margin-left: 3px; font-family: var(--sans); }
.stat-k { font-size: 11px; color: var(--tx-3); letter-spacing: .14em; margin-top: 5px; text-transform: uppercase; }
.stat.c-teal::after { background: linear-gradient(90deg, var(--aur-teal), transparent); }
.stat.c-violet::after { background: linear-gradient(90deg, var(--aur-violet), transparent); }
.stat.c-gold::after { background: linear-gradient(90deg, var(--aur-gold), transparent); }
.stat.c-cyan::after { background: linear-gradient(90deg, var(--aur-cyan), transparent); }
.v-teal { color: var(--aur-teal); } .v-violet { color: var(--aur-violet); }
.v-gold { color: var(--aur-gold); } .v-cyan { color: var(--aur-cyan); }
.v-ok { color: var(--ok); } .v-err { color: var(--err); }

/* 环形进度 */
.ring-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px,1fr)); gap: 12px; }
.ring-card {
  display: flex; align-items: center; gap: 13px;
  padding: 14px 15px; border-radius: var(--r-md);
  background: rgba(255,255,255,.022); border: 1px solid var(--edge);
  cursor: pointer; transition: all .22s;
}
.ring-card:hover { background: var(--glass-2); border-color: var(--edge-hi); transform: translateY(-2px); }
.ring { width: 50px; height: 50px; flex-shrink: 0; }
.ring circle { fill: none; stroke-width: 4; stroke-linecap: round; }
.ring .bgc { stroke: rgba(255,255,255,.075); }
.ring .fgc { transition: stroke-dashoffset 1.1s cubic-bezier(.4,0,.2,1); transform: rotate(-90deg); transform-origin: center; }
.ring-txt {
  position: absolute; inset: 0; display: grid; place-items: center;
  font-size: 12.5px; font-weight: 600; font-variant-numeric: tabular-nums;
  pointer-events: none;
}
.ring-txt small { font-size: 9px; font-weight: 500; }
.ring-wrap { position: relative; width: 50px; height: 50px; flex-shrink: 0; }
.ring-meta { min-width: 0; flex: 1; }
.ring-name { font-size: 13px; font-weight: 500; white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
             display: flex; align-items: center; gap: 6px; }
.ring-sub { font-size: 10.5px; color: var(--tx-3); margin-top: 3px; white-space: nowrap; }

/* 分类色 */
.c-mc   { --cc: #c084fc; }
.c-pr   { --cc: #38bdf8; }
.c-lg   { --cc: #fbbf24; }
.c-ck   { --cc: #34d399; }
.c-eye  { --cc: #f472b6; }
.c-oth  { --cc: #94a3b8; }
.cat-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--cc, var(--tx-3)); flex-shrink: 0;
           box-shadow: 0 0 8px var(--cc, transparent); }
.cat-tag {
  font-size: 10.5px; padding: 2px 9px; border-radius: 20px; letter-spacing: .08em;
  color: var(--cc, var(--tx-2));
  background: color-mix(in srgb, var(--cc, #94a3b8) 13%, transparent);
  border: 1px solid color-mix(in srgb, var(--cc, #94a3b8) 32%, transparent);
  white-space: nowrap;
}

/* ────────────答题区 ──────────── */
.q-meta { display: flex; align-items: center; gap: 9px; flex-wrap: wrap; margin-bottom: 14px; }
.q-no { font-size: 11.5px; color: var(--tx-3); font-variant-numeric: tabular-nums; letter-spacing: .1em; }

.q-stem {
  font-size: 16.5px; line-height: 1.78; color: #fff; margin-bottom: 22px;
  font-weight: 500;
}
.q-stem .qtype {
  display: inline-block; font-size: 11px; padding: 2px 8px; border-radius: 5px;
  background: rgba(96,165,250,.14); color: var(--info);
  border: 1px solid rgba(96,165,250,.3); margin-right: 9px; vertical-align: 3px;
  letter-spacing: .06em;
}

.opts { display: flex; flex-direction: column; gap: 10px; }
.opt {
  display: flex; align-items: flex-start; gap: 13px;
  padding: 14px 17px; border-radius: var(--r-md);
  background: rgba(255,255,255,.024);
  border: 1px solid var(--edge);
  cursor: pointer; transition: all .2s cubic-bezier(.4,0,.2,1);
  position: relative;
}
.opt:hover { background: var(--glass-2); border-color: var(--edge-hi); transform: translateX(3px); }
.opt-key {
  width: 25px; height: 25px; flex-shrink: 0; border-radius: 7px;
  display: grid; place-items: center;
  font-size: 12.5px; font-weight: 600;
  background: rgba(255,255,255,.07); color: var(--tx-2);
  border: 1px solid var(--edge);
  transition: all .2s;
}
.opt-tx { font-size: 14px; line-height: 1.68; padding-top: 2px; }

.opt.sel { background: rgba(56,189,248,.09); border-color: rgba(56,189,248,.42); }
.opt.sel .opt-key { background: var(--aur-cyan); color: var(--ink-900); border-color: transparent; }

.opt.right { background: rgba(52,211,153,.11); border-color: rgba(52,211,153,.5); }
.opt.right .opt-key { background: var(--ok); color: #04231a; border-color: transparent; }
.opt.wrong { background: rgba(251,113,133,.1); border-color: rgba(251,113,133,.48); }
.opt.wrong .opt-key { background: var(--err); color: #2b0710; border-color: transparent; }
.opt.lock { cursor: default; }
.opt.lock:hover { transform: none; background: inherit; }

.opt-flag {
  margin-left: auto; font-size: 11px; padding: 1px 8px; border-radius: 20px;
  align-self: center; white-space: nowrap;
}
.opt.right .opt-flag { background: rgba(52,211,153,.18); color: var(--ok); }
.opt.wrong .opt-flag { background: rgba(251,113,133,.18); color: var(--err); }

/* AI 解析 */
.ai-panel {
  margin-top: 18px; border-radius: var(--r-md);
  border: 1px solid rgba(56,189,248,.22);
  background: linear-gradient(135deg, rgba(56,189,248,.07), rgba(167,139,250,.05));
  overflow: hidden;
  animation: rise .4s cubic-bezier(.4,0,.2,1);
}
@keyframes rise { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }
.ai-hd {
  display: flex; align-items: center; gap: 9px;
  padding: 11px 17px; border-bottom: 1px solid rgba(56,189,248,.18);
  font-size: 12px; letter-spacing: .12em; color: var(--aur-cyan);
  text-transform: uppercase;
}
.ai-bd { padding: 16px 18px; }
.ai-key {
  font-family: var(--serif); font-size: 15.5px; color: #fff;
  margin-bottom: 11px; line-height: 1.6;
}
.ai-key::before { content: '考点 · '; color: var(--aur-violet); font-size: 12px; letter-spacing: .1em; }
.ai-why { font-size: 13.5px; line-height: 1.85; color: var(--tx-1); }
.ai-tip {
  margin-top: 13px; padding: 10px 14px; border-radius: var(--r-sm);
  background: rgba(217,177,105,.09); border-left: 2px solid var(--aur-gold);
  font-size: 13px; color: #f0dcae; line-height: 1.65;
}
.ai-tip::before { content: '速记 '; color: var(--aur-gold); font-size: 11px; letter-spacing: .12em; }
.ai-tags { margin-top: 13px; display: flex; gap: 7px; flex-wrap: wrap; }
.ai-note {
  margin-top: 12px; font-size: 11.5px; color: var(--tx-3); line-height: 1.6;
  padding-top: 11px; border-top: 1px dashed var(--edge);
}

/* 底部操作条 */
.act-bar {
  margin-top: 20px; display: flex; align-items: center; gap: 11px; flex-wrap: wrap;
}

.btn {
  padding: 9px 20px; border-radius: var(--r-sm); cursor: pointer;
  font-size: 13.5px; font-family: var(--sans); letter-spacing: .05em;
  background: rgba(255,255,255,.05); color: var(--tx-1);
  border: 1px solid var(--edge-hi);
  transition: all .2s; white-space: nowrap;
}
.btn:hover:not(:disabled) { background: rgba(255,255,255,.1); transform: translateY(-1px); }
.btn:disabled { opacity: .32; cursor: not-allowed; }
.btn.primary {
  background: linear-gradient(120deg, var(--aur-teal), var(--aur-cyan));
  color: var(--ink-900); font-weight: 600; border-color: transparent;
  box-shadow: 0 6px 20px rgba(45,212,191,.28);
}
.btn.primary:hover:not(:disabled) { box-shadow: 0 9px 26px rgba(45,212,191,.42); }
.btn.violet {
  background: linear-gradient(120deg, var(--aur-violet), #d8b4fe);
  color: var(--ink-900); font-weight: 600; border-color: transparent;
  box-shadow: 0 6px 20px rgba(167,139,250,.26);
}
.btn.ghost { background: transparent; }
.btn.sm { padding: 5px 12px; font-size: 12px; }

/* 进度条 */
.pbar { height: 3px; background: rgba(255,255,255,.07); border-radius: 3px; overflow: hidden; }
.pbar-f { height: 100%; background: linear-gradient(90deg, var(--aur-teal), var(--aur-cyan)); border-radius: 3px;
          transition: width .55s cubic-bezier(.4,0,.2,1); }

/* ────────────筛选栏 ──────────── */
.filters { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 16px; }
.chip {
  padding: 5px 14px; border-radius: 20px; font-size: 12.5px; cursor: pointer;
  background: rgba(255,255,255,.04); color: var(--tx-2);
  border: 1px solid var(--edge); transition: all .2s; user-select: none;
}
.chip:hover { background: var(--glass-2); color: var(--tx-1); }
.chip.on {
  background: color-mix(in srgb, var(--cc, var(--aur-cyan)) 15%, transparent);
  color: var(--cc, var(--aur-cyan));
  border-color: color-mix(in srgb, var(--cc, var(--aur-cyan)) 45%, transparent);
  box-shadow: 0 0 16px color-mix(in srgb, var(--cc, var(--aur-cyan)) 18%, transparent);
}

/* ────────────题目卡网格 ──────────── */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(212px,1fr)); gap: 11px; }
.qcard {
  padding: 14px 16px; border-radius: var(--r-md);
  background: var(--glass); border: 1px solid var(--edge);
  cursor: pointer; transition: all .22s cubic-bezier(.4,0,.2,1);
  display: flex; flex-direction: column; gap: 9px; min-height: 106px;
}
.qcard:hover { transform: translateY(-3px); border-color: var(--edge-hi); background: var(--glass-2);
               box-shadow: 0 12px 30px rgba(0,0,0,.4); }
.qcard-top { display: flex; align-items: center; gap: 7px; }
.qcard-idx { font-size: 10.5px; color: var(--tx-3); font-variant-numeric: tabular-nums; letter-spacing: .08em; }
.qcard-tx {
  font-size: 12.5px; line-height: 1.6; color: var(--tx-1);
  display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden;
  flex: 1;
}
.qcard-st { display: flex; align-items: center; gap: 6px; font-size: 10.5px; }
.st-dot { width: 6px; height: 6px; border-radius: 50%; }
.st-new { background: var(--tx-3); }
.st-ok { background: var(--ok); box-shadow: 0 0 7px var(--ok); }
.st-bad { background: var(--err); box-shadow: 0 0 7px var(--err); }
.st-mid { background: var(--warn); box-shadow: 0 0 7px var(--warn); }

/* ────────────表格 ──────────── */
.tbl { width: 100%; border-collapse: collapse; font-size: 13px; }
.tbl th {
  text-align: left; padding: 10px 13px; font-size: 11px; color: var(--tx-3);
  letter-spacing: .12em; text-transform: uppercase; font-weight: 500;
  border-bottom: 1px solid var(--edge);
}
.tbl td { padding: 11px 13px; border-bottom: 1px solid rgba(255,255,255,.045); }
.tbl tr:last-child td { border-bottom: none; }
.tbl tbody tr { transition: background .18s; }
.tbl tbody tr:hover { background: rgba(255,255,255,.028); }
.num { font-variant-numeric: tabular-nums; }

/* ────────────速记卡 ──────────── */
.flash-stage { perspective: 1600px; min-height: 320px; cursor: pointer; }
.flash {
  position: relative; width: 100%; min-height: 320px;
  transition: transform .62s cubic-bezier(.4,0,.2,1);
  transform-style: preserve-3d;
}
.flash.flip { transform: rotateY(180deg); }
.flash-face {
  position: absolute; inset: 0; backface-visibility: hidden; -webkit-backface-visibility: hidden;
  border-radius: var(--r-lg); padding: 30px 34px;
  display: flex; flex-direction: column; justify-content: center; align-items: center;
  text-align: center; gap: 16px;
}
.flash-front {
  background: linear-gradient(150deg, rgba(56,189,248,.09), rgba(167,139,250,.06));
  border: 1px solid rgba(56,189,248,.26);
}
.flash-back { transform: rotateY(180deg);
  background: linear-gradient(150deg, rgba(52,211,153,.09), rgba(56,189,248,.06));
  border: 1px solid rgba(52,211,153,.26); justify-content: flex-start; text-align: left; }
.flash-hint { font-size: 11.5px; color: var(--tx-3); letter-spacing: .16em; }
.flash-q { font-family: var(--serif); font-size: 22px; line-height: 1.6; color: #fff; }
.flash-a { font-size: 17px; font-weight: 600; }
.flash-why { font-size: 13.5px; line-height: 1.85; color: var(--tx-2); }

/* ────────────考试 ──────────── */
.exam-timer {
  font-family: var(--mono); font-size: 24px; font-weight: 600;
  font-variant-numeric: tabular-nums; letter-spacing: .05em;
}
.exam-timer.warn { color: var(--err); animation: pulse 1s infinite; }
@keyframes pulse { 50% { opacity: .55; } }

.score-ring { width: 168px; height: 168px; margin: 0 auto; position: relative; }
.score-ring svg { transform: rotate(-90deg); }
.score-ring circle { fill: none; stroke-width: 7; stroke-linecap: round; }
.score-txt {
  position: absolute; inset: 0; display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: 3px;
}
.score-num { font-family: var(--serif); font-size: 50px; line-height: 1; }
.score-lbl { font-size: 11px; color: var(--tx-3); letter-spacing: .18em; }

/* ────────────搜索 ──────────── */
.search-box {
  width: 100%; padding: 12px 17px 12px 44px; border-radius: var(--r-md);
  background: rgba(255,255,255,.04); border: 1px solid var(--edge);
  color: var(--tx-1); font-size: 14px; font-family: var(--sans); outline: none;
  transition: all .22s;
}
.search-box:focus { border-color: rgba(56,189,248,.5); background: rgba(255,255,255,.06);
                    box-shadow: 0 0 0 3px rgba(56,189,248,.09); }
.search-wrap { position: relative; margin-bottom: 16px; }
.search-ico { position: absolute; left: 16px; top: 50%; transform: translateY(-50%);
              color: var(--tx-3); font-size: 15px; pointer-events: none; }

/* ────────────雷达图 ──────────── */
.radar-wrap { display: flex; gap: 26px; align-items: center; flex-wrap: wrap; }
.radar-legend { flex: 1; min-width: 190px; display: flex; flex-direction: column; gap: 9px; }
.rl-item { display: flex; align-items: center; gap: 10px; font-size: 12.5px; }
.rl-bar { flex: 1; height: 5px; border-radius: 4px; background: rgba(255,255,255,.07); overflow: hidden; }
.rl-fill { height: 100%; border-radius: 4px; transition: width .8s cubic-bezier(.4,0,.2,1); }
.rl-val { font-size: 11.5px; color: var(--tx-2); font-variant-numeric: tabular-nums; min-width: 38px; text-align: right; }

/* ────────────AI 配置 / 气泡 ──────────── */
.fld { display: block; margin-bottom: 16px; }
.fld > span { display: block; font-size: 11px; color: var(--tx-3); letter-spacing: .13em; margin-bottom: 7px; }

.ai-actions { margin-top: 14px; display: flex; gap: 9px; flex-wrap: wrap; }

.ai-bubble {
  padding: 14px 17px; border-radius: var(--r-md);
  background: rgba(56,189,248,.07); border: 1px solid rgba(56,189,248,.22);
  font-size: 13.5px; line-height: 1.85; white-space: pre-wrap; color: var(--tx-1);
  min-height: 46px; margin-top: 12px;
}

/* ============================================================
   教练 Agent
   ============================================================ */
.agent-bar {
  display: flex; align-items: center; gap: 13px;
  padding: 15px 19px; border-radius: var(--r-lg); margin-bottom: 13px;
  background: linear-gradient(120deg, rgba(45,212,191,.09), rgba(167,139,250,.06));
  border: 1px solid rgba(56,189,248,.22);
  backdrop-filter: blur(18px); -webkit-backdrop-filter: blur(18px);
  box-shadow: 0 10px 34px rgba(0,0,0,.34), inset 0 1px 0 rgba(255,255,255,.06);
}
.agent-avatar {
  width: 40px; height: 40px; flex-shrink: 0; border-radius: 12px;
  display: grid; place-items: center; font-family: var(--serif);
  font-size: 18px; font-weight: 600; color: var(--ink-900);
  background: linear-gradient(140deg, var(--aur-teal), var(--aur-cyan) 50%, var(--aur-violet));
  box-shadow: 0 0 20px rgba(56,189,248,.36), inset 0 1px 0 rgba(255,255,255,.4);
}
.agent-avatar.sm { width: 30px; height: 30px; font-size: 13px; border-radius: 9px; margin-top: 2px; }
.agent-meta { min-width: 0; }
.agent-name { font-family: var(--serif); font-size: 15px; display: flex; align-items: center; gap: 8px; }
.agent-live {
  font-size: 10px; padding: 1px 7px; border-radius: 20px; font-family: var(--sans);
  background: rgba(52,211,153,.15); color: var(--ok); border: 1px solid rgba(52,211,153,.3);
}
.agent-live::before { content: '●'; margin-right: 3px; animation: pulse 2s infinite; }
.agent-sub { font-size: 11.5px; color: var(--tx-3); margin-top: 3px; }

.agent-cmd { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 14px; }

.agent-log {
  min-height: 300px; max-height: 56vh; overflow-y: auto;
  padding: 4px 2px 12px; display: flex; flex-direction: column; gap: 15px;
  /* 不用 smooth：程序化滚动动画期间命中测试会拿到过期坐标，点不中卡片 */
  scroll-behavior: auto;
  overscroll-behavior: contain;
}
.agent-empty {
  text-align: center; padding: 62px 20px; color: var(--tx-2); font-size: 13.5px; line-height: 2;
}
.agent-empty-glyph {
  font-size: 38px; opacity: .3; margin-bottom: 14px;
  background: linear-gradient(120deg, var(--aur-teal), var(--aur-violet));
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}

.msg { display: flex; gap: 11px; animation: rise .32s cubic-bezier(.4,0,.2,1); }
.msg-col { flex: 1; min-width: 0; display: flex; flex-direction: column; gap: 11px; }
.msg.me { justify-content: flex-end; }

.msg-bubble {
  padding: 12px 16px; border-radius: 4px 15px 15px 15px;
  font-size: 13.8px; line-height: 1.86; max-width: 100%;
  background: var(--glass); border: 1px solid var(--edge);
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
}
.msg.me .msg-bubble {
  border-radius: 15px 4px 15px 15px;
  background: linear-gradient(125deg, rgba(45,212,191,.2), rgba(56,189,248,.13));
  border-color: rgba(56,189,248,.34); color: #fff; max-width: 78%;
}
.msg-bubble b { color: var(--aur-cyan); font-weight: 600; }
.msg.me .msg-bubble b { color: #fff; }
.msg-bubble code {
  font-family: var(--mono); font-size: 12px; padding: 1px 6px; border-radius: 4px;
  background: rgba(255,255,255,.08); color: var(--aur-gold);
}
.md-h { font-family: var(--serif); font-size: 14.5px; color: #fff; margin: 9px 0 5px; }
.md-li { color: var(--tx-1); margin: 2px 0; }

.typing { display: flex; gap: 5px; align-items: center; padding: 17px 18px; }
.typing span {
  width: 6px; height: 6px; border-radius: 50%; background: var(--aur-cyan);
  animation: bounce 1.3s infinite ease-in-out;
}
.typing span:nth-child(2) { animation-delay: .18s; }
.typing span:nth-child(3) { animation-delay: .36s; }
@keyframes bounce { 0%,60%,100% { transform: translateY(0); opacity:.35 } 30% { transform: translateY(-6px); opacity:1 } }

/* Agent 出题卡 */
.qz-card { border-color: rgba(167,139,250,.26); }
.qz-card .card-hd h3 { color: var(--aur-violet); }
.qz-item { padding: 15px 0; border-bottom: 1px solid rgba(255,255,255,.05); }
.qz-item:last-of-type { border-bottom: none; }
.qz-stem { font-size: 14px; line-height: 1.75; color: #fff; margin-bottom: 11px; font-weight: 500; }
.qz-opts { display: flex; flex-direction: column; gap: 7px; }
.qz-opt {
  display: flex; gap: 10px; align-items: flex-start;
  padding: 9px 13px; border-radius: var(--r-sm); font-size: 13px; line-height: 1.65;
  background: rgba(255,255,255,.022); border: 1px solid var(--edge);
  cursor: pointer; transition: all .18s;
}
.qz-opt span {
  font-weight: 600; font-size: 11.5px; color: var(--tx-2); flex-shrink: 0;
  width: 16px; margin-top: 1px;
}
.qz-opt:hover { background: var(--glass-2); border-color: var(--edge-hi); }
.qz-opt.sel { background: rgba(167,139,250,.14); border-color: rgba(167,139,250,.48); }
.qz-opt.sel span { color: var(--aur-violet); }
.qz-opt.right { background: rgba(52,211,153,.12); border-color: rgba(52,211,153,.5); }
.qz-opt.right span { color: var(--ok); }
.qz-opt.wrong { background: rgba(251,113,133,.11); border-color: rgba(251,113,133,.48); }
.qz-opt.wrong span { color: var(--err); }
.qz-opt.lock { cursor: default; }
.qz-opt.lock:hover { background: inherit; }
.qz-fb:empty { display: none; }
.qz-why {
  margin-top: 11px; padding: 11px 14px; border-radius: var(--r-sm); font-size: 12.8px;
  line-height: 1.82; color: var(--tx-2);
  background: rgba(255,255,255,.028); border-left: 2px solid var(--aur-cyan);
}
.qz-why b { color: var(--aur-cyan); }
.qz-score {
  margin-top: 15px; padding: 12px 16px; border-radius: var(--r-md); text-align: center;
  font-family: var(--serif); font-size: 17px; color: var(--aur-teal);
  background: rgba(45,212,191,.09); border: 1px solid rgba(45,212,191,.24);
}

.weak-row {
  display: flex; align-items: center; gap: 12px; padding: 11px 0;
  border-bottom: 1px solid rgba(255,255,255,.05); flex-wrap: wrap;
}
.weak-row:last-child { border-bottom: none; }
.weak-acc {
  font-family: var(--serif); font-size: 17px; color: var(--err);
  font-variant-numeric: tabular-nums; min-width: 48px;
}
.weak-tip { font-size: 12.8px; color: var(--tx-2); flex: 1; min-width: 180px; line-height: 1.7; }

.agent-input {
  position: sticky; bottom: 0; display: flex; gap: 10px; align-items: flex-end;
  margin-top: 14px; padding: 11px; border-radius: var(--r-lg);
  background: rgba(10,15,26,.86); border: 1px solid var(--edge-hi);
  backdrop-filter: blur(22px); -webkit-backdrop-filter: blur(22px);
  box-shadow: 0 -4px 30px rgba(0,0,0,.4);
}
.agent-input textarea {
  flex: 1; resize: none; border: none; outline: none; background: transparent;
  color: var(--tx-1); font-size: 14px; font-family: var(--sans); line-height: 1.65;
  padding: 8px 6px; max-height: 140px;
}
.agent-input textarea::placeholder { color: var(--tx-3); }
.agent-input .btn { flex-shrink: 0; }

/* ============================================================
   卡片模式
   ============================================================ */
body.cm-active .side { display: none; }
body.cm-active { overflow: hidden; }
body.cm-active .main { padding: 0; max-width: none; }
body.cm-active .bg .aurora { animation-play-state: paused; }

.cm {
  min-height: 100vh; display: flex; flex-direction: column;
  padding: 22px 26px 26px; max-width: 900px; margin: 0 auto;
}

.cm-top { display: flex; align-items: center; gap: 16px; margin-bottom: 26px; }
.cm-exit {
  background: none; border: none; color: var(--tx-3); cursor: pointer;
  font-size: 13px; font-family: var(--sans); padding: 4px 2px; white-space: nowrap;
  transition: color .2s;
}
.cm-exit:hover { color: var(--tx-1); }
.cm-bar {
  flex: 1; height: 2px; background: rgba(255,255,255,.08);
  border-radius: 2px; overflow: hidden;
}
.cm-bar i {
  display: block; height: 100%; border-radius: 2px;
  background: linear-gradient(90deg, var(--aur-teal), var(--aur-violet));
  transition: width .5s cubic-bezier(.4,0,.2,1);
}
.cm-count {
  font-family: var(--serif); font-size: 15px; color: #fff;
  font-variant-numeric: tabular-nums; white-space: nowrap;
}
.cm-count em { font-style: normal; color: var(--tx-3); font-size: 12px; }
.cm-cat { white-space: nowrap; }

.cm-body { flex: 1; display: flex; flex-direction: column; }
.cm-meta { display: flex; align-items: center; gap: 9px; margin-bottom: 18px; }
.cm-hint { font-size: 11.5px; color: var(--tx-3); margin-left: auto; }

.cm-stem {
  font-family: var(--serif);
  font-size: 24px; line-height: 1.72; color: #fff; font-weight: 500;
  margin-bottom: 30px; letter-spacing: .01em;
}

.cm-opts { display: flex; flex-direction: column; gap: 11px; }
.cm-opt {
  display: flex; align-items: center; gap: 16px;
  padding: 17px 22px; border-radius: var(--r-md);
  background: rgba(255,255,255,.025);
  border: 1px solid var(--edge);
  cursor: pointer; transition: all .2s cubic-bezier(.4,0,.2,1);
  position: relative;
}
.cm-opt:hover { background: var(--glass-2); border-color: var(--edge-hi); transform: translateX(4px); }
.cm-k {
  width: 30px; height: 30px; flex-shrink: 0; border-radius: 9px;
  display: grid; place-items: center; font-size: 13.5px; font-weight: 600;
  background: rgba(255,255,255,.07); color: var(--tx-2);
  border: 1px solid var(--edge); transition: all .2s;
}
.cm-tx { font-size: 15.5px; line-height: 1.7; }

.cm-opt.on { background: rgba(56,189,248,.1); border-color: rgba(56,189,248,.45); }
.cm-opt.on .cm-k { background: var(--aur-cyan); color: var(--ink-900); border-color: transparent; }
.cm-opt.right { background: rgba(52,211,153,.1); border-color: rgba(52,211,153,.5); }
.cm-opt.right .cm-k { background: var(--ok); color: #04231a; border-color: transparent; }
.cm-opt.wrong { background: rgba(251,113,133,.09); border-color: rgba(251,113,133,.48); }
.cm-opt.wrong .cm-k { background: var(--err); color: #2b0710; border-color: transparent; }
.cm-opt.lock { cursor: default; }
.cm-opt.lock:hover { transform: none; }
.cm-flag {
  margin-left: auto; font-size: 11.5px; padding: 2px 10px; border-radius: 20px;
  white-space: nowrap;
}
.cm-opt.right .cm-flag { background: rgba(52,211,153,.18); color: var(--ok); }
.cm-opt.wrong .cm-flag { background: rgba(251,113,133,.18); color: var(--err); }

.cm-ai {
  margin-top: 26px; padding: 20px 22px; border-radius: var(--r-lg);
  background: linear-gradient(140deg, rgba(56,189,248,.07), rgba(167,139,250,.05));
  border: 1px solid rgba(56,189,248,.22);
  animation: rise .38s cubic-bezier(.4,0,.2,1);
}
.cm-ai-hd {
  font-size: 12px; letter-spacing: .12em; color: var(--aur-cyan);
  text-transform: uppercase; margin-bottom: 13px;
}
.cm-warn {
  font-size: 13px; line-height: 1.8; color: var(--warn); margin-bottom: 12px;
  padding: 10px 13px; border-radius: var(--r-sm);
  background: rgba(251,191,36,.09); border-left: 2px solid var(--warn);
}
.cm-key { font-family: var(--serif); font-size: 17px; color: #fff; margin-bottom: 11px; line-height: 1.6; }
.cm-why { font-size: 14px; line-height: 1.86; color: var(--tx-1); }
.cm-ai-foot { margin-top: 15px; }

.cm-foot {
  display: flex; align-items: center; gap: 11px; justify-content: flex-end;
  margin-top: 28px; padding-top: 18px; border-top: 1px solid var(--edge);
}
.cm-foot .btn.primary { min-width: 128px; }

/* ============================================================
   浅色主题
   底色不是简单反色 —— 重新调了一套低饱和纸墨配色，
   保留极光的通透感但压到能长时间阅读的亮度
   ============================================================ */
[data-theme="light"] {
  --ink-900: #eef1f7;
  --ink-800: #e6eaf3;
  --ink-700: #dfe4ef;
  --ink-600: #ffffff;

  --aur-teal: #0d9488;
  --aur-cyan: #0284c7;
  --aur-violet: #7c3aed;
  --aur-gold: #b0761a;
  --aur-jade: #059669;

  --ok: #059669;
  --err: #e11d48;
  --warn: #d97706;
  --info: #2563eb;

  --tx-1: #131a26;
  --tx-2: #4a5567;
  --tx-3: #8b95a6;

  --glass: rgba(255, 255, 255, .58);
  --glass-2: rgba(255, 255, 255, .8);
  --edge: rgba(15, 23, 42, .1);
  --edge-hi: rgba(15, 23, 42, .18);
}

[data-theme="light"] .bg-base {
  background:
    radial-gradient(ellipse 90% 60% at 20% -10%, rgba(13, 148, 136, .14), transparent 60%),
    radial-gradient(ellipse 80% 55% at 85% 5%, rgba(124, 58, 237, .1), transparent 62%),
    radial-gradient(ellipse 100% 70% at 50% 110%, rgba(2, 132, 199, .09), transparent 65%),
    linear-gradient(180deg, #f6f8fc 0%, #eaeef6 45%, #f4f7fb 100%);
}
[data-theme="light"] .aurora { opacity: .2; filter: blur(64px); }
[data-theme="light"] .stars, [data-theme="light"] .stars2 { opacity: .18; }
[data-theme="light"] .grid-lines {
  background-image:
    linear-gradient(rgba(15,23,42,.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(15,23,42,.035) 1px, transparent 1px);
}
[data-theme="light"] .glow-top {
  background: radial-gradient(ellipse 50% 50% at 50% 50%, rgba(255,255,255,.85), transparent 70%);
}

[data-theme="light"] body { color: var(--tx-1); }

[data-theme="light"] .side {
  background: rgba(255, 255, 255, .72);
  border-right-color: var(--edge);
}
[data-theme="light"] .card {
  background: linear-gradient(160deg, rgba(255,255,255,.9), rgba(255,255,255,.62));
  box-shadow:
    0 1px 0 rgba(255,255,255,.9) inset,
    0 14px 40px rgba(15, 23, 42, .08),
    0 2px 6px rgba(15, 23, 42, .05);
}
[data-theme="light"] .card::before { background: linear-gradient(90deg, transparent, rgba(255,255,255,.95), transparent); }

[data-theme="light"] .sec-title, [data-theme="light"] .brand-name {
  background: linear-gradient(100deg, #0f172a 10%, var(--aur-cyan) 60%, var(--aur-violet));
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
[data-theme="light"] .stat, [data-theme="light"] .ring-card, [data-theme="light"] .qcard,
[data-theme="light"] .opt, [data-theme="light"] .cm-opt, [data-theme="light"] .qz-opt {
  background: rgba(255,255,255,.7);
}
[data-theme="light"] .ring .bgc { stroke: rgba(15,23,42,.1); }
[data-theme="light"] .ring-card, [data-theme="light"] .qcard:hover,
[data-theme="light"] .opt:hover, [data-theme="light"] .cm-opt:hover {
  background: #fff;
  box-shadow: 0 8px 26px rgba(15,23,42,.1);
}

[data-theme="light"] .opt-key, [data-theme="light"] .cm-k, [data-theme="light"] .opt-key {
  background: rgba(15,23,42,.05); color: var(--tx-2); border-color: var(--edge);
}
[data-theme="light"] .pbar, [data-theme="light"] .cm-bar { background: rgba(15,23,42,.09); }
[data-theme="light"] .rl-bar { background: rgba(15,23,42,.08); }

[data-theme="light"] .ai-panel, [data-theme="light"] .cm-ai, [data-theme="light"] .agent-bar {
  background: linear-gradient(140deg, rgba(2,132,199,.07), rgba(124,58,237,.05));
  border-color: rgba(2,132,199,.24);
}
[data-theme="light"] .ai-why, [data-theme="light"] .cm-why, [data-theme="light"] .msg-bubble { color: var(--tx-1); }
[data-theme="light"] .ai-tip {
  background: rgba(176,118,26,.09); color: #7a4f0d;
  border-left-color: var(--aur-gold);
}
[data-theme="light"] .ai-tip::before { color: var(--aur-gold); }
[data-theme="light"] .ai-note { color: var(--tx-3); border-top-color: var(--edge); }
[data-theme="light"] .qz-why, [data-theme="light"] .exam-item {
  background: rgba(15,23,42,.028); border-left-color: var(--aur-cyan);
}
[data-theme="light"] .qz-score { background: rgba(13,148,136,.1); border-color: rgba(13,148,136,.28); color: var(--aur-teal); }

[data-theme="light"] .msg.me .msg-bubble {
  background: linear-gradient(125deg, rgba(13,148,136,.16), rgba(2,132,199,.1));
  border-color: rgba(2,132,199,.3); color: #0f172a;
}
[data-theme="light"] .msg-bubble b { color: var(--aur-cyan); }
[data-theme="light"] .agent-input { background: rgba(255,255,255,.9); }
[data-theme="light"] .typing span { background: var(--aur-cyan); }

[data-theme="light"] .nav-item.on {
  background: linear-gradient(120deg, rgba(2,132,199,.12), rgba(124,58,237,.09));
  color: #0f172a; border-color: rgba(2,132,199,.32);
  box-shadow: 0 2px 10px rgba(15,23,42,.08);
}
[data-theme="light"] .nav-item.on::before { background: linear-gradient(180deg, var(--aur-cyan), var(--aur-violet)); }
[data-theme="light"] .nav-item:hover { color: #0f172a; }
[data-theme="light"] .sec-sub, [data-theme="light"] .streak-lbl { color: var(--tx-3); }
[data-theme="light"] .stat-v, [data-theme="light"] .ring-num { color: var(--tx-1); }

[data-theme="light"] .tbl tbody tr:hover { background: rgba(15,23,42,.03); }
[data-theme="light"] .tbl td { border-bottom-color: rgba(15,23,42,.06); }
[data-theme="light"] .tbl th { color: var(--tx-3); border-bottom-color: var(--edge); }
[data-theme="light"] .empty-ico { opacity: .22; }
[data-theme="light"] .toast { background: rgba(255,255,255,.96); }
[data-theme="light"] .chip:hover { background: rgba(15,23,42,.05); }
[data-theme="light"] .btn:hover:not(:disabled) { background: rgba(15,23,42,.07); }
[data-theme="light"] .btn.primary, [data-theme="light"] .btn.violet { color: #fff; }
[data-theme="light"] .opt.right, [data-theme="light"] .cm-opt.right { background: rgba(5,150,105,.1); }
[data-theme="light"] .opt.wrong, [data-theme="light"] .cm-opt.wrong { background: rgba(225,29,72,.08); }
[data-theme="light"] .search-box { background: rgba(255,255,255,.8); }
[data-theme="light"] .search-box:focus { background: #fff; }
[data-theme="light"] .flash-front, [data-theme="light"] .flash-back { border-radius: var(--r-lg); }
[data-theme="light"] .user-row { background: rgba(255,255,255,.66); }
[data-theme="light"] .user-row.on { background: rgba(2,132,199,.08); border-color: rgba(2,132,199,.3); }

/* 侧栏底部：主题按钮 + 用户卡 */
.side-ico {
  position: absolute; top: 10px; right: 6px;
  width: 30px; height: 30px; border-radius: 9px; cursor: pointer;
  background: rgba(255,255,255,.05); border: 1px solid var(--edge);
  color: var(--tx-2); font-size: 14px; line-height: 1;
  display: grid; place-items: center; transition: all .2s;
}
.side-ico:hover { background: var(--glass-2); color: var(--tx-1); }
[data-theme="light"] .side-ico { background: rgba(15,23,42,.05); }

.side-user {
  display: flex; align-items: center; gap: 10px; cursor: pointer;
  padding: 9px 8px; margin-bottom: 14px; border-radius: var(--r-sm);
  border: 1px solid transparent; transition: all .22s;
}
.side-user:hover { background: var(--glass); border-color: var(--edge); }
.side-av {
  width: 28px; height: 28px; flex-shrink: 0; border-radius: 9px;
  display: grid; place-items: center; font-size: 13px; font-weight: 600;
  font-family: var(--serif); color: #fff;
  background: linear-gradient(140deg, var(--aur-teal), var(--aur-cyan) 55%, var(--aur-violet));
}
.side-un { min-width: 0; }
.side-un-name {
  font-size: 12.5px; color: var(--tx-1); white-space: nowrap;
  overflow: hidden; text-overflow: ellipsis;
}
.side-un-sub { font-size: 10px; color: var(--tx-3); margin-top: 1px; }

/* 用户列表 */
.user-row {
  display: flex; align-items: center; gap: 13px; padding: 13px 15px;
  border-radius: var(--r-md); border: 1px solid var(--edge);
  background: rgba(255,255,255,.022); margin-bottom: 9px; transition: all .2s;
}
.user-row:hover { background: var(--glass-2); border-color: var(--edge-hi); }
.user-row.on { border-color: rgba(56,189,248,.42); background: rgba(56,189,248,.08); }
.user-av {
  width: 38px; height: 38px; flex-shrink: 0; border-radius: 12px;
  display: grid; place-items: center; font-family: var(--serif);
  font-size: 16px; color: #fff;
  background: linear-gradient(140deg, var(--aur-teal), var(--aur-cyan) 55%, var(--aur-violet));
}
.user-meta { flex: 1; min-width: 0; }
.user-nm { font-size: 14px; display: flex; align-items: center; gap: 8px; }
.user-nm em {
  font-style: normal; font-size: 10px; padding: 1px 7px; border-radius: 20px;
  background: rgba(56,189,248,.16); color: var(--aur-cyan); border: 1px solid rgba(56,189,248,.3);
}
.user-st { font-size: 11.5px; color: var(--tx-3); margin-top: 3px; }

/* ============================================================
   登录门
   ============================================================ */
.login-wrap {
  min-height: 100vh; display: flex; flex-direction: column;
  align-items: center; justify-content: center; padding: 40px 20px;
}
.login-glyph {
  width: 62px; height: 62px; border-radius: 19px; display: grid; place-items: center;
  font-family: var(--serif); font-size: 30px; font-weight: 600; color: var(--ink-900);
  background: linear-gradient(140deg, var(--aur-teal), var(--aur-cyan) 48%, var(--aur-violet));
  box-shadow: 0 0 42px rgba(56,189,248,.4), inset 0 2px 0 rgba(255,255,255,.4);
  margin-bottom: 20px;
}
.login-title {
  font-family: var(--serif); font-size: 34px; letter-spacing: .22em; font-weight: 500;
  background: linear-gradient(100deg, #fff 10%, var(--aur-teal) 55%, var(--aur-violet));
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
[data-theme="light"] .login-title {
  background: linear-gradient(100deg, #0f172a 10%, var(--aur-cyan) 60%, var(--aur-violet));
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.login-sub { font-size: 12px; color: var(--tx-3); letter-spacing: .2em; margin: 9px 0 30px; }

.login-card {
  width: 100%; max-width: 348px; padding: 26px 26px 24px; border-radius: var(--r-lg);
}
.login-fld { display: block; margin-bottom: 15px; }
.login-fld > span {
  display: block; font-size: 11px; color: var(--tx-3);
  letter-spacing: .13em; margin-bottom: 7px;
}
.login-fld input {
  width: 100%; padding: 12px 15px; border-radius: var(--r-sm); outline: none;
  font-size: 14.5px; font-family: var(--sans); color: var(--tx-1);
  background: rgba(255,255,255,.04); border: 1px solid var(--edge);
  transition: all .22s;
}
.login-fld input:focus {
  border-color: rgba(56,189,248,.55);
  box-shadow: 0 0 0 3px rgba(56,189,248,.1);
}
.login-err {
  margin: -3px 0 14px; padding: 9px 13px; border-radius: var(--r-sm); font-size: 12.5px;
  color: var(--err); background: rgba(251,113,133,.1); border: 1px solid rgba(251,113,133,.26);
}
.login-btn { width: 100%; padding: 12px 0; font-size: 15px; margin-top: 6px; }
.login-foot { margin-top: 26px; font-size: 11.5px; color: var(--tx-3); letter-spacing: .06em; }

/* ────────────Toast ──────────── */
.toast {
  position: fixed; bottom: 30px; left: 50%; transform: translateX(-50%) translateY(90px);
  padding: 11px 24px; border-radius: 26px; z-index: 100;
  background: rgba(12,18,32,.94); border: 1px solid var(--edge-hi);
  font-size: 13.5px; backdrop-filter: blur(16px);
  box-shadow: 0 12px 40px rgba(0,0,0,.55);
  transition: transform .35s cubic-bezier(.4,0,.2,1); opacity .35s; opacity: 0;
}
.toast.show { transform: translateX(-50%) translateY(0); opacity: 1; }

/* 空状态 */
.empty { text-align: center; padding: 56px 20px; color: var(--tx-3); }
.empty-ico { font-size: 40px; opacity: .28; margin-bottom: 14px; }
.empty-tx { font-size: 13.5px; line-height: 1.8; }

/* ============================================================
   移动端适配
   < 860px 侧栏改为底部 Tab（原生 App 习惯，拇指可达）
   ============================================================ */
.side-tools { display: flex; gap: 7px; margin-bottom: 13px; }
.side-tools .side-ico { position: static; }
.side-ico.off { color: var(--tx-3); opacity: .55; }

@media (max-width: 860px) {
  :root { --r-lg: 18px; }

  /* 安全区 */
  .shell { flex-direction: column; min-height: 100dvh; }
  body { -webkit-tap-highlight-color: transparent; overscroll-behavior-y: none; }

  /* 侧栏 -> 底部 Tab */
  .side {
    position: fixed; left: 0; right: 0; bottom: 0; top: auto;
    width: 100%; height: auto; z-index: 60;
    flex-direction: row; gap: 0;
    padding: 6px 6px calc(6px + env(safe-area-inset-bottom));
    border-right: none;
    border-top: 1px solid var(--edge);
    background: rgba(10,15,26,.9);
    backdrop-filter: blur(22px); -webkit-backdrop-filter: blur(22px);
    overflow-x: auto; overflow-y: hidden;
    scrollbar-width: none;
  }
  .side::-webkit-scrollbar { display: none; }
  .side .brand, .side-foot { display: none; }

  .nav-item {
    flex: 1 0 auto; min-width: 60px; min-height: 46px;
    flex-direction: column; gap: 2px;
    padding: 5px 4px; border-radius: 11px; text-align: center;
    font-size: 10px; line-height: 1.2;
  }
  .nav-item .nav-ico { font-size: 17px; width: auto; }
  .nav-item.on { background: rgba(56,189,248,.12); border-color: rgba(56,189,248,.3); }
  .nav-item.on::before { display: none; }
  .nav-badge {
    position: absolute; top: 1px; right: 8px; margin: 0;
    font-size: 9px; padding: 0 5px; line-height: 15px; min-width: 15px; text-align: center;
  }

  /* 主区 */
  .main {
    padding: 16px 13px calc(84px + env(safe-area-inset-bottom));
    max-width: none; width: 100%;
  }
  .sec-title { font-size: 21px; }
  .sec-sub { font-size: 11.5px; margin-bottom: 16px; }
  .card-bd { padding: 16px 14px; }
  .card-hd { padding: 14px 15px 12px; }
  .card-hd h3 { font-size: 14px; }

  /* 触控目标放大 */
  .btn { padding: 11px 18px; font-size: 14px; min-height: 40px; }
  .btn.sm { padding: 7px 13px; min-height: 34px; }
  .chip { padding: 8px 14px; font-size: 13px; min-height: 34px; display: inline-flex; align-items: center; }
  .opt, .cm-opt, .qz-opt { padding: 14px 15px; }
  .opt-key, .cm-k { width: 32px; height: 32px; font-size: 14px; }
  .q-stem { font-size: 15.5px; line-height: 1.75; }
  .qcard { min-height: 96px; padding: 13px 14px; }

  /* 统计卡两列 */
  .stats { grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .stat { padding: 13px 14px; }
  .stat-v { font-size: 26px; }

  /* 环形卡两列 */
  .ring-row { grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .ring-sub { font-size: 10px; }
  .radar-wrap { flex-direction: column; gap: 16px; }
  .radar-legend { width: 100%; }

  /* 表格横向滚动，不撑破布局 */
  .card-bd:has(.tbl) { overflow-x: auto; -webkit-overflow-scrolling: touch; }
  .tbl { min-width: 460px; }

  /* Agent */
  .agent-bar { padding: 12px 14px; gap: 10px; }
  .agent-cmd { gap: 6px; }
  .agent-log { max-height: none; min-height: 200px; }
  .agent-input { padding: 8px; border-radius: 14px; }
  .agent-input textarea { font-size: 16px; }   /* 防止 iOS 自动缩放 */
  .msg.me .msg-bubble { max-width: 88%; }
  .msg-bubble { font-size: 14px; }
  .qz-stem { font-size: 14.5px; }

  /* 登录页 */
  .login-glyph { width: 54px; height: 54px; font-size: 26px; border-radius: 16px; }
  .login-title { font-size: 27px; letter-spacing: .18em; }
  .login-card { max-width: 100%; padding: 20px 18px; }
  .login-fld input { font-size: 16px; }        /* 防止 iOS 自动缩放 */

  /* 设置页输入 */
  .login-fld input, .search-box, .fld input, .fld textarea { font-size: 16px; }

  /* 卡片模式：真全屏 */
  body.cm-active .main { padding: 0; }
  .cm { padding: calc(14px + env(safe-area-inset-top)) 15px
                  calc(16px + env(safe-area-inset-bottom)); }
  .cm-stem { font-size: 19px; line-height: 1.65; margin-bottom: 22px; }
  .cm-opt { padding: 15px 16px; gap: 13px; }
  .cm-tx { font-size: 15px; }
  .cm-foot { flex-wrap: wrap; gap: 9px; }
  .cm-foot .btn { flex: 1 1 auto; }
  .cm-foot .btn.primary { min-width: 0; flex: 2 1 100%; order: -1; }
  .cm-ai { padding: 16px 15px; }
  .cm-key { font-size: 15.5px; }
  .cm-why { font-size: 13.5px; }

  /* 进度条固定底部导航之上 */
  .agent-input { bottom: calc(6px + env(safe-area-inset-bottom)); }
}

/* 超窄屏 */
@media (max-width: 380px) {
  .stats, .ring-row { grid-template-columns: 1fr; }
  .nav-item { min-width: 52px; font-size: 9px; }
  .cm-stem { font-size: 17px; }
}

/* 横屏矮屏：卡片模式压缩纵向间距 */
@media (max-height: 520px) and (orientation: landscape) {
  .cm-stem { font-size: 17px; margin-bottom: 14px; }
  .cm-opt { padding: 10px 14px; }
  .cm-body { gap: 0; }
  .flash-stage, .flash { min-height: 220px; }
}

/* 滚动条 */
::-webkit-scrollbar { width: 9px; height: 9px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,.11); border-radius: 5px; }
::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,.2); }

html { scroll-behavior: auto; }
::selection { background: rgba(56,189,248,.3); color: #fff; }
/* 登录页隐藏侧栏 */
body.login-mode .side { display: none; }
body.login-mode .main { padding: 0; max-width: none; }

/* ============================================================
   反馈
   ============================================================ */
.fb-item {
  padding: 13px 0; border-bottom: 1px solid var(--edge);
}
.fb-item:last-child { border-bottom: none; }
.fb-hd { display: flex; align-items: center; gap: 9px; margin-bottom: 8px; }
.fb-tx { font-size: 13.5px; line-height: 1.7; color: var(--tx-1); }
.fb-st { font-size: 11.5px; margin-top: 6px; }
.fb-st.ok { color: var(--ok); }
.fb-st.bad { color: var(--err); }
.fld textarea { resize: vertical; }