/* ============================================================
   考公刷题 · Apple iOS 风格主题（系统色板 · 纯色平涂 · 深浅双模式）
   设计语言：无渐变 / 无彩色光晕 / hairline 细线框 / 大圆角 / 克制配色
   签名：清晰易读 / 系统原生观感 / 扁平邻接层次 / 深浅双模式完整支持
   ============================================================ */

* { margin: 0; padding: 0; box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

/* ---------- Token（浅色 = 默认，Apple systemPalette） ---------- */
:root {
  --bg: #f2f2f7;                 /* systemGroupedBackground */
  --bg-soft: #e9e9ee;            /* 轨道/次级填充 */
  --card: #ffffff;               /* 卡片（secondarySystemGroupedBackground） */
  --card-2: #f2f2f7;             /* 次级底 */
  --text: #000000;               /* systemLabel */
  --text-2: rgba(60, 60, 67, .66);   /* secondaryLabel */
  --text-3: rgba(60, 60, 67, .38);   /* tertiaryLabel */
  --muted: rgba(60, 60, 67, .48);
  --primary: #007aff;            /* systemBlue */
  --primary-strong: #0062dd;     /* 按下态 */
  --primary-fill: #007aff;       /* 白字实心场景（按钮/选中态） */
  --primary-soft: rgba(0, 122, 255, .09);
  --primary-glow: rgba(0, 122, 255, .25); /* 兼容别名：一律不再发光，仅保留变量 */
  --primary-shadow: rgba(0, 122, 255, .28);
  --accent: #ff9500;             /* systemOrange */
  --border: rgba(60, 60, 67, .13);       /* hairline separator */
  --border-strong: rgba(60, 60, 67, .3);
  --green: #34c759;              /* systemGreen */
  --green-soft: rgba(52, 199, 89, .12);
  --red: #ff3b30;                /* systemRed */
  --red-soft: rgba(255, 59, 48, .1);
  --amber: #ff9500;              /* systemOrange（=accent） */
  --amber-soft: rgba(255, 149, 0, .14);
  --violet: #af52de;             /* systemPurple */
  --cyan: #30b0c7;               /* 青（图标块用） */
  --radius: 16px;                /* 卡片 */
  --radius-sm: 12px;             /* 控件 */
  --radius-xs: 9px;              /* 小元素 */
  --shadow: none;                /* 卡片靠 hairline 分层，不投影 */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, .06);   /* 分段控件活动段等微浮起 */
  --shadow-lg: 0 20px 44px rgba(0, 0, 0, .22); /* 弹层/悬浮 */
  --topbar-h: 48px;
  --nav-h: 49px;                 /* iOS Tab Bar 高度 */
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  /* 兼容别名：历史样式引用过 --bg-2 / --text-1，统一定义避免隐式继承 */
  --bg-2: var(--bg-soft);
  --text-1: var(--text);
}

/* ---------- Token（深色：纯黑 + 更高层卡片） ---------- */
[data-theme="dark"] {
  --bg: #000000;
  --bg-soft: #1c1c1e;            /* systemGray6 */
  --card: #1c1c1e;
  --card-2: #2c2c2e;             /* systemGray5 */
  --text: #ffffff;
  --text-2: rgba(235, 235, 245, .62);
  --text-3: rgba(235, 235, 245, .3);
  --muted: rgba(235, 235, 245, .4);
  --primary: #0a84ff;
  --primary-strong: #409cff;
  --primary-fill: #0a84ff;
  --primary-soft: rgba(10, 132, 255, .16);
  --primary-glow: rgba(10, 132, 255, .35);
  --primary-shadow: rgba(10, 132, 255, .45);
  --accent: #ff9f0a;
  --border: rgba(84, 84, 88, .55);
  --border-strong: rgba(84, 84, 88, .72);
  --green: #30d158;
  --green-soft: rgba(48, 209, 88, .16);
  --red: #ff453a;
  --red-soft: rgba(255, 69, 58, .16);
  --amber: #ff9f0a;
  --amber-soft: rgba(255, 159, 10, .18);
  --violet: #bf5af2;
  --cyan: #40c8e0;
  --shadow: none;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, .4);
  --shadow-lg: 0 24px 48px rgba(0, 0, 0, .6);
}

/* 跟随系统（无手动覆盖时） */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #000000;
    --bg-soft: #1c1c1e;
    --card: #1c1c1e;
    --card-2: #2c2c2e;
    --text: #ffffff;
    --text-2: rgba(235, 235, 245, .62);
    --text-3: rgba(235, 235, 245, .3);
    --muted: rgba(235, 235, 245, .4);
    --primary: #0a84ff;
    --primary-strong: #409cff;
    --primary-fill: #0a84ff;
    --primary-soft: rgba(10, 132, 255, .16);
    --primary-glow: rgba(10, 132, 255, .35);
    --primary-shadow: rgba(10, 132, 255, .45);
    --accent: #ff9f0a;
    --border: rgba(84, 84, 88, .55);
    --border-strong: rgba(84, 84, 88, .72);
    --green: #30d158;
    --green-soft: rgba(48, 209, 88, .16);
    --red: #ff453a;
    --red-soft: rgba(255, 69, 58, .16);
    --amber: #ff9f0a;
    --amber-soft: rgba(255, 159, 10, .18);
    --violet: #bf5af2;
    --cyan: #40c8e0;
    --shadow: none;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, .4);
    --shadow-lg: 0 24px 48px rgba(0, 0, 0, .6);
  }
}

/* ---------- 基础 ---------- */
html { height: 100%; color-scheme: light; }
html[data-theme="dark"] { color-scheme: dark; }
@media (prefers-color-scheme: dark) {
  html:not([data-theme="light"]) { color-scheme: dark; }
}
body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro SC", "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 16px;
  line-height: 1.6;
  min-height: 100%;
  -webkit-font-smoothing: antialiased;
  transition: background .3s ease, color .3s ease;
}
button { font-family: inherit; }
h1, h2, h3, .hs-num, .stat-card .num { font-family: inherit; font-variant-numeric: tabular-nums; }

/* ---------- 顶栏 ---------- */
#topbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  display: flex; align-items: center; gap: 6px;
  height: var(--topbar-h);
  padding: 0 10px;
  background: var(--card); /* 旧内核回退（无 color-mix 时用不透明卡片色） */
  background: color-mix(in srgb, var(--card) 82%, transparent);
  backdrop-filter: blur(20px) saturate(1.8);
  -webkit-backdrop-filter: blur(20px) saturate(1.8);
  border-bottom: 1px solid var(--border);
}
#topbar h1 {
  flex: 1; text-align: center;
  font-size: 17px; font-weight: 700; letter-spacing: 0;
  color: var(--text);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
#topbar .icon-btn {
  border: none; background: transparent; cursor: pointer;
  width: 36px; height: 36px; border-radius: 999px;
  font-size: 19px; color: var(--primary);
  display: flex; align-items: center; justify-content: center;
  transition: background .15s ease, transform .1s ease;
  flex-shrink: 0;
}
#topbar .icon-btn:hover { background: var(--primary-soft); }
#topbar .icon-btn:active { transform: scale(.92); }
#topbar .icon-btn.spacer { visibility: hidden; }
#topbar-right { width: 36px; display: flex; justify-content: flex-end; }

/* ---------- 主体 ---------- */
#view {
  padding: calc(var(--topbar-h) + 14px) 14px calc(var(--nav-h) + 20px);
  max-width: 680px; margin: 0 auto;
  animation: viewIn .28s ease;
}
#view.no-bottom { padding-bottom: 28px; }
@keyframes viewIn { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

/* ---------- 底部导航（iOS Tab Bar 毛玻璃） ---------- */
#bottom-nav {
  position: fixed; bottom: 0; left: 0; right: 0; z-index: 100;
  display: flex;
  height: calc(var(--nav-h) + var(--safe-bottom));
  padding-bottom: var(--safe-bottom);
  background: var(--card); /* 旧内核回退（无 color-mix 时用不透明卡片色） */
  background: color-mix(in srgb, var(--card) 78%, transparent);
  backdrop-filter: blur(20px) saturate(1.8);
  -webkit-backdrop-filter: blur(20px) saturate(1.8);
  border-top: 1px solid var(--border);
}
.nav-item {
  flex: 1; border: none; background: none; cursor: pointer;
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 2px;
  font-size: 10px; font-weight: 600; color: var(--text-3);
  position: relative;
  transition: color .18s ease;
}
.nav-item .nav-ico { font-size: 22px; line-height: 1; display: inline-flex; transition: transform .15s ease, color .18s ease; }
.nav-item .nav-ico svg { display: block; }
/* iOS Tab Bar：选中 = 实心图标，未选中 = 描边图标（.o 描边 / .f 实心） */
.nav-item .nav-ico .f { display: none; }
.nav-item.active .nav-ico .o { display: none; }
.nav-item.active .nav-ico .f { display: block; }
.nav-item.active { color: var(--primary); font-weight: 700; }
.nav-item.active .nav-ico { transform: translateY(-1px); }

/* ---------- 卡片 ---------- */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 16px;
}
.card h3 { font-size: 15px; font-weight: 700; margin-bottom: 8px; letter-spacing: 0; }
.card .card-sub { font-size: 12px; color: var(--text-2); margin-bottom: 10px; }

/* ---------- 首页 Hero：今日作答卡（纯色平涂，iOS 健身环风格） ---------- */
.hero {
  position: relative; overflow: hidden;
  background: var(--primary-fill);
  color: #fff;
  border-radius: 22px;
  padding: 22px 20px 20px;
  margin-bottom: 16px;
  box-shadow: var(--shadow-lg);
}
.hero .hero-eyebrow { font-size: 11px; font-weight: 700; letter-spacing: 1.6px; opacity: .8; text-transform: uppercase; }
.hero .hero-title { font-size: 22px; font-weight: 800; margin-top: 4px; letter-spacing: 0; }
.hero .hero-stats { display: flex; gap: 22px; margin-top: 18px; position: relative; z-index: 1; }
.hero .hero-stat .hs-num { font-size: 26px; font-weight: 800; font-variant-numeric: tabular-nums; line-height: 1.1; }
.hero .hero-stat .hs-label { font-size: 11px; opacity: .8; margin-top: 2px; }
.hero .hero-cta {
  display: inline-flex; align-items: center; gap: 6px;
  margin-top: 18px; padding: 10px 20px;
  background: #fff;
  border: none;
  border-radius: 999px;
  font-size: 14px; font-weight: 700; color: var(--primary); cursor: pointer;
  transition: opacity .15s ease, transform .1s ease;
  position: relative; z-index: 1;
}
.hero .hero-cta:hover { opacity: .92; }
.hero .hero-cta:active { transform: scale(.97); opacity: .85; }

/* ---------- 题库网格（试卷封面卡） ---------- */
.subject-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.subject-card {
  position: relative;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 14px 14px;
  cursor: pointer;
  overflow: hidden;
  transition: transform .12s ease, box-shadow .18s ease, border-color .18s ease;
}
.subject-card:active { transform: scale(.97); }
.subject-card .emoji {
  display: inline-flex; align-items: center; justify-content: center;
  width: 44px; height: 44px; border-radius: 14px;
  font-size: 30px; line-height: 1;
  color: #fff;
}
.subject-card .name { font-weight: 700; font-size: 15.5px; margin-top: 10px; letter-spacing: 0; }
.subject-card .desc { color: var(--text-2); font-size: 11.5px; margin-top: 3px; line-height: 1.5; }
.subject-card .desc:empty { display: none; }
.subject-card .stat-line {
  display: flex; gap: 10px; margin-top: 12px; padding-top: 10px;
  border-top: 1px solid var(--border);
  font-size: 11px; color: var(--text-3);
}
.subject-card .stat-line b { color: var(--text); font-weight: 800; font-variant-numeric: tabular-nums; }

/* ---------- 快捷入口（iOS 应用库风格图标块） ---------- */
.quick-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(56px, 1fr)); gap: 8px; }
.quick-item {
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 7px;
  background: var(--card); border: 1px solid var(--border);
  border-radius: 14px;
  padding: 14px 4px 12px;
  cursor: pointer; transition: transform .1s ease, background .15s ease;
}
.quick-item:active { transform: scale(.95); background: var(--primary-soft); }
.quick-item .qi-ico {
  width: 44px; height: 44px; border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  color: #fff;
  transition: transform .15s ease;
}
.quick-item:hover .qi-ico { transform: translateY(-1px); }
.quick-item .qi-label { font-size: 11px; font-weight: 600; color: var(--text-2); white-space: nowrap; }

/* ---------- 列表 ---------- */
.list-item {
  display: flex; align-items: center; gap: 12px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 13px 14px;
  margin-bottom: 9px;
  cursor: pointer;
  transition: transform .1s ease, border-color .15s ease;
}
.list-item:active { transform: scale(.985); border-color: var(--primary); }
.list-item.li-disabled { opacity: .55; }
.list-item.li-disabled:active { transform: none; border-color: var(--border); }
.list-item .li-badge { font-size: 10px; font-weight: 600; color: var(--text-2); background: var(--bg-2); border: 1px solid var(--border); border-radius: 6px; padding: 0 5px; margin-left: 4px; vertical-align: 1px; }
.list-item .li-icon {
  width: 38px; height: 38px; border-radius: 12px; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  font-size: 18px; background: var(--primary); color: #fff;
}
.list-item .li-main { flex: 1; min-width: 0; }
.list-item .li-title { font-size: 14.5px; font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.list-item .li-sub { font-size: 12px; color: var(--text-2); margin-top: 3px; }
.list-item .li-arrow { color: var(--text-3); font-size: 15px; flex-shrink: 0; }
.list-item .li-del {
  color: var(--text-3); font-size: 15px; flex-shrink: 0; cursor: pointer;
  padding: 6px 4px 6px 8px; border-radius: 8px; transition: color .15s, background .15s;
}
.list-item .li-del:hover { color: var(--red, #ff3b30); background: var(--bg-2); }
.list-item.li-disabled .li-del { opacity: .9; }
.li-tip { font-size: 12px; color: var(--text-2); margin-top: 8px; }

/* 笔记列表项：题干多行展示，其他信息紧凑 */
.note-item .li-title {
  white-space: normal;
  display: -webkit-box;
  -webkit-line-clamp: 4;
  -webkit-box-orient: vertical;
  text-overflow: ellipsis;
  line-height: 1.5;
  font-size: 14px;
  overflow: hidden;
}
.note-item .li-note {
  max-height: 38px;     /* 2 行紧凑 */
  font-size: 12.5px;
  padding: 5px 9px;
  margin-top: 6px;
}
.note-item .li-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-top: 6px;
}
.note-item .li-sub {
  font-size: 11px;
  color: var(--text-3);
  margin-top: 0;
  flex: 1;
  min-width: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.li-actions {
  display: flex;
  gap: 4px;
  flex-shrink: 0;
}
.li-icon-btn {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text-2);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: color .15s, background .15s, border-color .15s;
  padding: 0;
}
.li-icon-btn:hover {
  background: var(--primary-soft);
  border-color: var(--primary);
  color: var(--primary);
}
.li-icon-btn.li-icon-btn-danger:hover {
  background: var(--red-soft);
  border-color: var(--red);
  color: var(--red);
}

/* 徽章 */
.badge {
  display: inline-block; background: var(--primary-soft); color: var(--primary);
  border-radius: 999px; padding: 2.5px 9px; font-size: 11px; font-weight: 700;
}
.badge.badge-amber { background: var(--amber-soft); color: var(--amber); }
.badge.badge-green { background: var(--green-soft); color: var(--green); }
.badge.badge-red { background: var(--red-soft); color: var(--red); }

/* 真题/模拟题 Tab（iOS 分段控件） */
.mock-tabs {
  display: flex; gap: 2px; margin-bottom: 12px;
  background: var(--bg-soft); border-radius: 11px; padding: 2px;
}
.mock-tab {
  flex: 1; border: none; background: transparent; cursor: pointer;
  padding: 8px; border-radius: 9px;
  font-size: 13.5px; font-weight: 600; color: var(--text-2);
  transition: all .18s ease;
}
.mock-tab.active {
  background: var(--card); color: var(--primary);
  font-weight: 700;
  box-shadow: var(--shadow-sm);
}

/* 技能库列表项（AI 设置页） */
.skill-item {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 12px; margin-top: 8px;
  background: var(--bg-soft); border: 1px solid var(--border); border-radius: 12px;
}
.skill-item b { font-size: 14px; word-break: break-all; }

/* ---------- 刷题页 ---------- */
/* 顶部进度 */
.q-progress-bar {
  height: 5px; border-radius: 999px;
  background: var(--bg-soft); overflow: hidden;
  margin-bottom: 12px;
}
.q-progress-bar .fill {
  height: 100%; border-radius: 999px;
  background: var(--primary);
  transition: width .35s ease;
}

.q-meta { display: flex; align-items: center; gap: 7px; margin-bottom: 12px; flex-wrap: wrap; }
.q-meta .tag {
  font-size: 11px; padding: 3.5px 9px; border-radius: 8px; font-weight: 700; letter-spacing: 0;
}
.tag-chapter { background: var(--primary-soft); color: var(--primary); }
.tag-type { background: var(--amber-soft); color: var(--amber); }
.tag-difficulty { background: var(--bg-soft); color: var(--text-2); }
.q-progress-text { font-size: 12px; color: var(--text-3); margin-left: auto; font-weight: 600; font-variant-numeric: tabular-nums; }

/* 题号操作区（收藏 + 答题卡） */
.q-actions { display: flex; gap: 6px; margin-left: auto; align-items: center; }
.q-actions + .q-progress-text { margin-left: 0; }
.q-fav, .q-card-btn {
  border: 1px solid var(--border); background: var(--card);
  width: 32px; height: 32px; border-radius: 10px;
  font-size: 15px; cursor: pointer; color: var(--text-2);
  display: flex; align-items: center; justify-content: center;
  transition: all .15s ease;
}
.q-fav.on { color: var(--amber); border-color: var(--amber); background: var(--amber-soft); }
.q-card-btn { font-size: 14px; }

/* 答案对照（粉笔风格） */
.answer-cmp {
  display: flex; gap: 18px; align-items: center;
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 10px 14px; margin: 12px 0 0;
  font-size: 13.5px;
}
.cmp-item { display: inline-flex; align-items: center; gap: 6px; color: var(--text-2); font-weight: 600; }
.cmp-item b { color: var(--text); font-weight: 800; letter-spacing: 1px; }
.cmp-dot { width: 8px; height: 8px; border-radius: 50%; display: inline-block; }
.cmp-dot.mine { background: var(--red); }
.cmp-dot.right { background: var(--green); }

/* 题干 */
.q-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 18px 16px; margin-bottom: 14px;
}
.q-content { font-size: 15.5px; line-height: 1.75; white-space: pre-wrap; word-break: break-word; }
.q-content img { max-width: 100%; border-radius: 10px; margin: 8px 0; }
.q-content .material { color: var(--text-2); border-left: 3px solid var(--accent); padding-left: 10px; margin-bottom: 10px; }

/* 选项 */
.option {
  display: flex; align-items: flex-start; width: 100%; text-align: left;
  position: relative;
  background: var(--card);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 13px 14px; margin-bottom: 10px; cursor: pointer;
  font-size: 15px; line-height: 1.55; color: var(--text);
  transition: border-color .12s ease, background .12s ease, transform .08s ease;
}
.option:active { transform: scale(.99); }
.option .opt-key {
  display: inline-flex; align-items: center; justify-content: center;
  width: 26px; height: 26px; border-radius: 9px;
  background: var(--bg-soft); color: var(--text-2);
  font-weight: 800; font-size: 13px; margin-right: 11px; flex-shrink: 0;
  transition: all .12s ease;
}
.option.selected { border-color: var(--primary); background: var(--primary-soft); }
.option.selected .opt-key { background: var(--primary-fill); color: #fff; }
.option.correct { border-color: var(--green); background: var(--green-soft); }
.option.correct .opt-key { background: var(--green); color: #fff; }
.option.wrong { border-color: var(--red); background: var(--red-soft); }
.option.wrong .opt-key { background: var(--red); color: #fff; }
.option:disabled { opacity: .75; }
/* 长按排除（排除法）：置灰划线 + 右上角 ✕；不可点击，再次长按恢复 */
.option.excluded {
  opacity: .42;
  border-style: dashed;
  border-color: var(--text-3, #9aa0aa);
  background: var(--bg-soft);
  text-decoration: line-through;
  -webkit-user-select: none; user-select: none;
}
.option.excluded .opt-key { background: var(--bg-2, #e4e7ec); color: var(--text-3, #9aa0aa); }
.option.excluded::after {
  content: '✕';
  position: absolute;
  top: 6px; right: 10px;
  font-size: 14px; font-weight: 900;
  color: var(--red);
  opacity: .85;}

/* 背题模式：判分后选项锁定（正确绿/误选红，不可再点） */
.option.locked { cursor: default; }
.option.locked:hover { border-color: var(--border); background: var(--bg-soft); transform: none; }
.option.locked.correct { border-color: var(--green); background: var(--green-soft); }
.option.locked.wrong { border-color: var(--red); background: var(--red-soft); }
.option.locked .opt-key { box-shadow: none; }

/* 判分横幅 */
.result-banner {
  display: flex; align-items: center; justify-content: center; gap: 8px;
  border-radius: 14px; padding: 13px 14px; margin: 14px 0;
  font-weight: 800; font-size: 15px; text-align: center;
  animation: bannerIn .3s ease;
}
@keyframes bannerIn { from { opacity: 0; transform: scale(.94); } to { opacity: 1; transform: none; } }
.result-banner.ok { background: var(--green-soft); color: var(--green); border: 1px solid var(--green); border-color: color-mix(in srgb, var(--green) 30%, transparent); }
.result-banner.no { background: var(--red-soft); color: var(--red); border: 1px solid var(--red); border-color: color-mix(in srgb, var(--red) 30%, transparent); }
.result-banner.none { background: var(--bg-soft); color: var(--text-2); border: 1px solid var(--border-strong); }
.empty-opt-tip { display: flex; align-items: center; justify-content: center; gap: 6px; padding: 14px; margin: 12px 0; border-radius: var(--radius-sm); background: var(--bg-soft); color: var(--text-2); font-size: 13px; }

/* 解析框 */
.answer-box {
  background: var(--card-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 15px; margin-bottom: 14px;
  font-size: 14px; line-height: 1.75;
}
.answer-box .ab-title { font-weight: 800; color: var(--primary); margin-bottom: 6px; font-size: 14px; letter-spacing: 0; }
.answer-box .ab-title.ok { color: var(--green); }
.answer-box .ab-title.no { color: var(--red); }
.ab-title svg, .card h3 svg, .mat-head svg, .li-tip svg, .result-banner svg, .sheet-head svg { vertical-align: -2.5px; margin-right: 4px; }
#app-title svg { vertical-align: -3px; margin-right: 5px; }

/* AI/解析富文本：统一处理 Markdown、公式、长段落和结构化输出。 */
.rt-content { line-height: 1.82; word-break: break-word; overflow-wrap: anywhere; white-space: normal; }
.rt-content > :first-child { margin-top: 0; }
.rt-content > :last-child { margin-bottom: 0; }
.rt-content p { margin: .48em 0; }
.rt-content strong { color: var(--text); font-weight: 800; }
.rt-content em { color: var(--text-2); }
.rt-content del { color: var(--text-3); }
.rt-content a { color: var(--primary); text-decoration: underline; text-underline-offset: 2px; }
.rt-heading { color: var(--primary); font-size: 1.05em; line-height: 1.45; margin: .8em 0 .35em; }
.rt-heading:first-child { margin-top: 0; }
.rt-section-heading { display: flex; align-items: baseline; gap: 8px; margin: .9em 0 .28em; color: var(--primary); font-size: 1em; line-height: 1.5; }
.rt-section-heading:first-child { margin-top: 0; }
.rt-section-heading > span { flex: 0 0 auto; border-left: 3px solid var(--primary); padding-left: 8px; font-weight: 800; }
.rt-section-heading > strong { color: var(--text); font-weight: 700; }
.rt-list { margin: .4em 0 .65em; padding-left: 1.55em; }
.rt-list li { margin: .25em 0; padding-left: .2em; }
.rt-quote { margin: .65em 0; padding: .45em .8em; border-left: 3px solid var(--primary); color: var(--text-2); background: var(--bg-soft); border-radius: 0 8px 8px 0; }
.rt-quote .rt-content { line-height: 1.7; }
.rt-rule { border: 0; border-top: 1px solid var(--border); margin: 1em 0; }
.rt-inline-code { padding: .12em .35em; border-radius: 5px; background: var(--bg-soft); border: 1px solid var(--border); color: var(--primary); font: .9em ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
.rt-code-block { position: relative; overflow-x: auto; margin: .7em 0; padding: 11px 12px; border-radius: 9px; background: var(--bg); border: 1px solid var(--border); color: var(--text); font: 12.5px/1.65 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; white-space: pre; }
.rt-code-block code { font: inherit; }
.rt-code-lang { position: absolute; top: 5px; right: 8px; color: var(--text-3); font: 10px/1.2 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
.rt-table-wrap { width: 100%; overflow-x: auto; margin: .7em 0; border: 1px solid var(--border); border-radius: 9px; }
.rt-table { width: 100%; min-width: 380px; border-collapse: collapse; font-size: .94em; line-height: 1.6; }
.rt-table th, .rt-table td { padding: 7px 9px; border-bottom: 1px solid var(--border); text-align: left; vertical-align: top; }
.rt-table th { background: var(--bg-soft); color: var(--text-2); font-weight: 800; white-space: nowrap; }
.rt-table tr:last-child td { border-bottom: 0; }
.rt-math-inline { display: inline-block; max-width: 100%; padding: 0 .12em; color: var(--text); font: 1.04em/1.2 "Cambria Math", "STIX Two Math", "Latin Modern Math", "Times New Roman", serif; vertical-align: -.08em; white-space: nowrap; }
.rt-math-block { display: block; max-width: 100%; overflow-x: auto; margin: .75em 0; padding: .7em .9em; border: 1px solid color-mix(in srgb, var(--primary) 20%, var(--border)); border-radius: 9px; background: color-mix(in srgb, var(--primary-soft) 45%, var(--card)); color: var(--text); text-align: center; font: 1.12em/1.45 "Cambria Math", "STIX Two Math", "Latin Modern Math", "Times New Roman", serif; white-space: nowrap; }
.rt-inline-content { display: inline; line-height: inherit; white-space: normal; }
.rt-inline-content > p { display: inline; margin: 0; }
.rt-inline-content > .rt-math-block { display: inline-block; margin: 0 .15em; padding: .22em .4em; vertical-align: middle; }
.opt-body > .rt-inline-content, .pv-opt > span:last-child > .rt-inline-content, .qd-opt > span:last-child > .rt-inline-content { display: inline; }
.rt-frac { display: inline-flex; flex-direction: column; justify-content: center; vertical-align: middle; margin: 0 .14em; text-align: center; line-height: 1.05; }
.rt-frac > span:first-child { padding: 0 .2em .12em; border-bottom: 1px solid currentColor; }
.rt-frac > span:last-child { padding: .12em .2em 0; }
.rt-root { display: inline-flex; align-items: flex-start; vertical-align: middle; }
.rt-root-symbol { font-size: 1.35em; line-height: .9; }
.rt-root-body { border-top: 1px solid currentColor; padding: .04em .12em 0; }
.rt-overline { border-top: 1px solid currentColor; padding-top: .04em; }
.rt-math-text { font-family: inherit; }
.rt-math-space { display: inline-block; width: .45em; }
.ab-body > .rt-content, .ai-test-result > .rt-content, .qd-content > .rt-content, .pv-fold > .rt-content { width: 100%; }
.ai-tutor-message-body { white-space: normal; }
.ai-tutor-message-body .rt-content { line-height: 1.68; }
.q-content > .rt-content { white-space: normal; }
.mat-body > .rt-content, .iv-html > .rt-content { white-space: normal; }

/* 随题 AI 辅导：桌面端固定右侧，窄屏回到题目下方；历史消息不与其它题目串联 */
.ai-tutor-card {
  background: var(--card-2);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 13px;
  margin: 16px 0;
  box-shadow: 0 6px 24px rgba(0, 0, 0, .06);
}
.ai-tutor-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 10px; }
.ai-tutor-title { color: var(--primary); font-weight: 800; font-size: 15px; }
.ai-tutor-title svg { vertical-align: -3px; margin-right: 3px; }
.ai-tutor-subtitle { color: var(--text-3); font-size: 11px; margin-top: 3px; }
.ai-tutor-status { color: var(--text-3); font-size: 11px; max-width: 150px; text-align: right; }
.ai-tutor-status.error { color: var(--red); }
.ai-tutor-messages {
  display: flex; flex-direction: column; gap: 8px; min-height: 78px; max-height: min(42vh, 430px);
  overflow-y: auto; margin: 12px 0; padding: 2px;
}
.ai-tutor-empty { color: var(--text-3); font-size: 12px; line-height: 1.6; padding: 17px 10px; text-align: center; background: var(--bg-soft); border-radius: 10px; }
.ai-tutor-message { max-width: 92%; border-radius: 12px; padding: 8px 10px; font-size: 13px; line-height: 1.65; white-space: pre-wrap; word-break: break-word; }
.ai-tutor-message.user { align-self: flex-end; background: var(--primary-soft); color: var(--text); }
.ai-tutor-message.assistant { align-self: flex-start; background: var(--bg-soft); color: var(--text); border: 1px solid var(--border); }
.ai-tutor-message.pending { opacity: .68; }
.ai-tutor-message.failed { border-color: color-mix(in srgb, var(--red) 42%, var(--border)); }
.ai-tutor-message.cancelled { opacity: .62; }
.ai-tutor-message-label { color: var(--text-3); font-size: 10px; font-weight: 700; margin-bottom: 2px; }
.ai-tutor-message-body { white-space: normal; }
.ai-tutor-message-status { color: var(--text-3); font-size: 10px; margin-top: 3px; }
.ai-tutor-compose { border-top: 1px solid var(--border); padding-top: 10px; }
.ai-tutor-input { width: 100%; min-height: 64px; box-sizing: border-box; resize: vertical; border: 1px solid var(--border-strong); border-radius: 10px; padding: 8px 10px; background: var(--card); color: var(--text); font: inherit; font-size: 13px; line-height: 1.55; outline: none; }
.ai-tutor-input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-soft); }
.ai-tutor-actions { display: flex; align-items: center; gap: 7px; margin-top: 7px; }
.ai-tutor-hint { color: var(--text-3); font-size: 10px; flex: 1; }
.ai-tutor-actions .btn { flex: 0 0 auto; padding: 8px 10px; border-radius: 10px; font-size: 12px; }

@media (min-width: 1180px) {
  #view[data-exam='1']:has(.ai-tutor-card) { max-width: min(790px, calc(100vw - 390px)); margin-left: max(14px, calc((100vw - 1180px) / 2)); margin-right: 390px; }
  #view[data-exam='1'] .ai-tutor-card { position: fixed; z-index: 20; top: calc(var(--topbar-h) + 14px); right: max(14px, calc((100vw - 1180px) / 2)); width: min(350px, calc(100vw - 830px)); max-height: calc(100vh - var(--topbar-h) - 42px); display: flex; flex-direction: column; margin: 0; }
  #view[data-exam='1'] .ai-tutor-messages { flex: 1 1 auto; min-height: 120px; }
}

/* 材料题（给定材料折叠块，由 JS 模板渲染） */
.mat-head { display: flex; align-items: center; gap: 5px; cursor: pointer; font-weight: 700; font-size: 13px; color: var(--primary); flex-wrap: wrap; }
.mat-chev { width: 0; height: 0; border-left: 5px solid transparent; border-right: 5px solid transparent; border-top: 6px solid currentColor; opacity: .55; transition: transform .18s ease; flex: 0 0 auto; }
.material-box.open .mat-chev { transform: rotate(180deg); }
.mat-status { color: var(--text-3); font-weight: 600; }
.mat-tools { margin-left: auto; display: flex; align-items: center; gap: 8px; }
.mat-full { border: 1px solid var(--border); background: var(--bg-soft); color: var(--text-2); border-radius: 8px; padding: 4px 9px; font-size: 12px; font-weight: 700; cursor: pointer; display: inline-flex; align-items: center; gap: 3px; }
.mat-full:active { filter: brightness(.92); }
.mat-body { font-size: 13px; line-height: 1.8; margin-top: 8px; max-height: 340px; overflow: auto; background: var(--card-2); border-radius: 10px; padding: 10px; }
/* 宽表格图：虚线框提示可点开放大（JS 渲染时外套 .mat-img-wrap） */
.mat-img-wrap { position: relative; display: inline-block; max-width: 100%; margin: 8px 0; outline: 1px dashed var(--border-strong); outline-offset: 2px; border-radius: 8px; }
.mat-img-wrap img, .iv-html img { display: block; max-width: 100%; height: auto; border-radius: 6px; }
.mat-img-wrap::after {
  content: ""; position: absolute; right: 6px; bottom: 6px; width: 22px; height: 22px; border-radius: 999px;
  background: rgba(0, 0, 0, .55) url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23ffffff' stroke-width='2.4' stroke-linecap='round'><circle cx='11' cy='11' r='7'/><path d='m20.5 20.5-4.2-4.2'/></svg>") center / 13px 13px no-repeat;
  pointer-events: none;
}

/* 全屏图片查看器（点开宽表格/公式图，双指缩放读数字） */
.iv-overlay {
  position: fixed; inset: 0; width: 100%; height: 100%; z-index: 400;
  background: rgba(0, 0, 0, .93); animation: fadeIn .15s ease;
}
.iv-stage { position: absolute; inset: 0; overflow: hidden; touch-action: none; cursor: grab; }
.iv-stage:active { cursor: grabbing; }
.iv-img { position: absolute; left: 50%; top: 50%; max-width: none; max-height: none; user-select: none; -webkit-user-drag: none; will-change: transform; }
.iv-tip { position: absolute; top: 14px; left: 50%; transform: translateX(-50%); color: rgba(255, 255, 255, .55); font-size: 12px; display: flex; align-items: center; gap: 4px; pointer-events: none; white-space: nowrap; }
.iv-tip svg { vertical-align: -2px; }
.iv-toolbar {
  position: absolute; left: 50%; bottom: 24px; transform: translateX(-50%);
  display: flex; align-items: center; gap: 4px; z-index: 1;
  background: rgba(30, 30, 32, .88); border-radius: 16px; padding: 6px 8px;
  box-shadow: 0 4px 18px rgba(0, 0, 0, .4);
}
.iv-btn { border: none; background: transparent; color: #fff; width: 38px; height: 38px; border-radius: 11px; cursor: pointer; font-size: 15px; display: flex; align-items: center; justify-content: center; }
.iv-btn:active { background: rgba(255, 255, 255, .16); }
.iv-btn svg { vertical-align: -2px; }
.iv-close { font-size: 14px; }
.iv-pct { color: rgba(255, 255, 255, .85); font-size: 12px; min-width: 52px; text-align: center; font-variant-numeric: tabular-nums; }

/* 全屏查看材料（大页面通读，内图可点开放大） */
.iv-material { z-index: 390; }
.iv-material-sheet { max-height: 84vh; overflow: hidden; display: flex; flex-direction: column; }
.iv-material-sheet .sheet-head { flex: 0 0 auto; }
.iv-html { flex: 1 1 auto; overflow-y: auto; font-size: 14px; line-height: 1.9; color: var(--text); min-height: 0; }
.iv-html p { margin: 0 0 10px; }
.iv-material-foot { flex: 0 0 auto; margin-top: 12px; font-size: 12px; color: var(--text-3); display: flex; align-items: center; gap: 4px; }

/* 桌面/平板宽屏（≥980px）：材料题左右分屏——材料固定左侧、题干+选项右侧，边看边算 */
@media (min-width: 980px) {
  #view[data-exam='1']:has(.quiz-split-row) { max-width: min(1180px, 96vw); }
  .quiz-split-row { display: flex; gap: 18px; align-items: flex-start; }
  .quiz-split-left { position: sticky; top: 84px; width: min(430px, 36vw); flex: 0 0 auto; max-height: calc(100vh - 112px); overflow: hidden; display: flex; flex-direction: column; background: var(--card-2); border: 1px solid var(--border); border-radius: 16px; padding: 12px; }
  .quiz-split-left .mat-body { flex: 1 1 auto; max-height: none; overflow-y: auto; min-height: 0; }
  .quiz-split-right { flex: 1 1 auto; min-width: 0; }
}
@media (max-width: 979px) {
  .quiz-split-row { display: block; }
  .quiz-split-left { margin: 0 0 10px; }
}

/* 分类折叠（专项练习标题行） */
.cat-toggle { font-size: 12px; color: var(--text-3); cursor: pointer; padding: 4px; }

/* 按钮（iOS 圆角矩形） */
.action-row { display: flex; gap: 10px; margin-top: 6px; flex-wrap: wrap; }
/* 窄屏（手机）：操作条两列排布——上一题/下一题一行，查看解析/交卷一行，避免 4 按钮挤压 */
@media (max-width: 520px) {
  .action-row .btn { flex: 1 1 calc(50% - 5px); }
  .action-row .btn:last-child:nth-child(odd) { flex: 1 1 100%; } /* 奇数个时最后一个独占一行 */
}
.btn {
  flex: 1; border: none; border-radius: 14px; padding: 13px;
  font-size: 14.5px; font-weight: 700; cursor: pointer;
  transition: transform .08s ease, opacity .15s ease, filter .15s ease, background .15s ease;
}
.btn:active { transform: scale(.98); filter: brightness(.92); }
.btn:disabled { opacity: .5; pointer-events: none; }
.btn svg, .btn-sm svg { vertical-align: -2.5px; margin-right: 4px; }
.btn svg:only-child { margin-right: 0; }
.btn-primary { background: var(--primary-fill); color: #fff; box-shadow: none; }
.btn-ghost { background: var(--bg-soft); color: var(--text); border: 1px solid var(--border); }
.btn-block { display: block; width: 100%; }
.btn-sm { flex: 0 0 auto; padding: 9px 14px; font-size: 13px; border-radius: 10px; }

/* 申论作答 */
#essay-input {
  width: 100%; min-height: 130px;
  border: 1.5px solid var(--border-strong); border-radius: var(--radius-sm);
  padding: 13px; font-size: 14.5px; line-height: 1.7;
  font-family: inherit; resize: vertical; background: var(--card); color: var(--text);
  outline: none; transition: border-color .15s ease, box-shadow .15s ease;
}
#essay-input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-soft); }

/* 识图作答辅助 */
.ocr-queue { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 8px; }
.ocr-status { font-size: 12.5px; color: var(--muted); margin-bottom: 8px; min-height: 0; }

/* ---------- 统计 ---------- */
.stat-row { display: flex; gap: 10px; margin-bottom: 12px; }
.stat-card {
  flex: 1; background: var(--card);
  border: 1px solid var(--border); border-radius: var(--radius);
  padding: 14px 8px; text-align: center;
}
.stat-card .num { font-size: 22px; font-weight: 800; color: var(--primary); font-variant-numeric: tabular-nums; }
.stat-card .label { font-size: 11.5px; color: var(--text-2); margin-top: 2px; font-weight: 600; }

/* 模块表现条形图 */
.mod-item { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; }
.mod-item .mod-name { width: 92px; flex-shrink: 0; font-size: 13px; font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.mod-item .mod-track { flex: 1; height: 9px; border-radius: 999px; background: var(--bg-soft); overflow: hidden; }
.mod-item .mod-fill { height: 100%; border-radius: 999px; transition: width .5s ease; background: var(--primary); }
.mod-item .mod-pct { width: 42px; text-align: right; font-size: 12.5px; font-weight: 700; font-variant-numeric: tabular-nums; }

/* 模块两级分组（粉笔风格） */
.mod-group { margin-bottom: 8px; border: 1px solid var(--border); border-radius: var(--radius-sm); overflow: hidden; background: var(--card); }
.mod-group-head {
  display: flex; align-items: center; gap: 10px; padding: 13px 14px;
  cursor: pointer; user-select: none; transition: background .15s ease;
}
.mod-group-head:active { background: var(--primary-soft); }
.mod-group-head .mg-ico {
  width: 30px; height: 30px; border-radius: 10px; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center; color: #fff;
  background: var(--primary);
}
.mod-group-head .mg-name { font-weight: 700; font-size: 14.5px; flex: 1; }
.mod-group-head .mg-stat { font-size: 11.5px; color: var(--text-3); font-variant-numeric: tabular-nums; }
.mod-group-head .mg-arrow { color: var(--text-3); font-size: 12px; transition: transform .2s ease; }
.mod-group-head.open { background: var(--primary-soft); }
.mod-group-body { padding: 4px 10px 10px; border-top: 1px dashed var(--border); }
.mod-group-body .list-item { margin-bottom: 6px; padding: 10px 12px; }

/* 中模块（二级） */
.mod-sub { margin-bottom: 6px; border: 1px solid var(--border); border-radius: 12px; overflow: hidden; background: var(--card-2); }
.mod-sub-head { display: flex; align-items: center; gap: 8px; padding: 10px 12px; cursor: pointer; user-select: none; }
.mod-sub-head:active { background: var(--primary-soft); }
.mod-sub-head .ms-ico {
  width: 26px; height: 26px; border-radius: 9px; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center; color: #fff;
  background: var(--cyan);
}
.mod-sub-head .ms-name { font-weight: 600; font-size: 13.5px; flex: 1; }
.mod-sub-head .ms-stat { font-size: 11px; color: var(--text-3); font-variant-numeric: tabular-nums; }
.mod-sub-head .mg-arrow { color: var(--text-3); font-size: 11px; }
.mod-sub-head.open { background: var(--primary-soft); }
.mod-sub-body { padding: 4px 8px 8px; border-top: 1px dashed var(--border); }
.mod-sub-body .list-item { margin-bottom: 6px; padding: 9px 11px; background: var(--card); }

/* 计时条 */
.timer-bar {
  display: flex; align-items: center; gap: 8px;
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 8px 12px; margin-bottom: 10px;
  font-variant-numeric: tabular-nums;
}
.timer-ico { font-size: 15px; display: inline-flex; align-items: center; }
#timer-text { font-size: 15px; font-weight: 800; color: var(--primary); letter-spacing: 0; min-width: 52px; }
.timer-bar .btn-sm { padding: 5px 10px; font-size: 13px; flex: 0 0 auto; }
.timer-tip { margin-left: auto; font-size: 11px; color: var(--text-3); }

/* 交卷解析界面 */
.review-card { padding: 14px; }
.review-head { display: flex; align-items: center; gap: 10px; }
.review-time { margin-left: auto; font-size: 12px; color: var(--text-2); font-weight: 600; font-variant-numeric: tabular-nums; }
.review-card .option { cursor: default; }

/* 答题卡弹层（iOS sheet 风格） */
.sheet-overlay {
  position: fixed; top: 0; left: 0; right: 0; bottom: 0; width: 100%; height: 100%; z-index: 200;
  background: rgba(0, 0, 0, .45);
  backdrop-filter: blur(2px);
  display: flex; align-items: center; justify-content: center;
  padding: 20px;
  animation: fadeIn .2s ease;
}
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
.sheet {
  width: 100%; max-width: 480px;
  max-height: 84vh;
  overflow-y: auto;
  background: var(--card);
  border-radius: 20px;
  padding: 12px 18px 22px;
  animation: sheetUp .25s ease;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border);
}
.sheet::before { content: ""; display: block; width: 36px; height: 5px; border-radius: 3px; background: var(--border-strong); margin: 2px auto 12px; opacity: .5; }
@keyframes sheetUp { from { transform: translateY(24px) scale(.97); opacity: .5; } to { transform: none; opacity: 1; } }
.sheet-head { display: flex; align-items: center; gap: 10px; margin-bottom: 16px; }
.sheet-head b { font-size: 16px; }
.sheet-count { font-size: 11.5px; color: var(--text-3); background: var(--bg-soft); border-radius: 8px; padding: 2px 8px; }
.sheet-close {
  margin-left: auto; border: none; background: var(--bg-soft);
  width: 30px; height: 30px; border-radius: 999px;
  font-size: 13px; cursor: pointer; color: var(--text-2);
}
.sheet-grid {
  display: grid; grid-template-columns: repeat(6, 1fr); gap: 9px;
  max-height: 46vh; overflow-y: auto; padding: 2px;
}
.sheet-cell {
  aspect-ratio: 1; border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 13.5px; font-weight: 700;
  background: var(--bg-soft); color: var(--text-2);
  cursor: pointer; transition: transform .1s ease;
}
.sheet-cell:active { transform: scale(.9); }
.sheet-cell.cur { outline: 2px solid var(--primary); outline-offset: -2px; color: var(--primary); font-weight: 800; }
.sheet-cell.ok { background: var(--green-soft); color: var(--green); }
.sheet-cell.no { background: var(--red-soft); color: var(--red); }
.sheet-legend { display: flex; gap: 16px; margin-top: 14px; font-size: 12px; color: var(--text-2); }
.sheet-legend .dot { width: 10px; height: 10px; border-radius: 4px; display: inline-block; margin-right: 5px; background: var(--bg-soft); }
.sheet-legend .dot.ok { background: var(--green); }
.sheet-legend .dot.no { background: var(--red); }

/* ---------- 空态 / 加载 ---------- */
.empty { text-align: center; color: var(--text-3); padding: 56px 20px; font-size: 14px; line-height: 1.8; }
.empty .empty-ico { font-size: 40px; display: block; margin-bottom: 10px; color: var(--text-3); }
.spinner {
  width: 30px; height: 30px; margin: 48px auto;
  border: 3px solid var(--border); border-top-color: var(--primary);
  border-radius: 50%; animation: spin .8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- Toast ---------- */
.toast {
  position: fixed; left: 50%; bottom: calc(var(--nav-h) + 18px);
  transform: translateX(-50%) translateY(14px);
  background: var(--text); /* 旧内核回退（无 color-mix 时用纯文字色） */
  background: color-mix(in srgb, var(--text) 88%, transparent);
  color: var(--card);
  padding: 11px 20px; border-radius: 999px;
  font-size: 13.5px; font-weight: 600;
  opacity: 0; pointer-events: none;
  transition: all .25s ease; z-index: 999;
  max-width: 86vw; text-align: center;
  box-shadow: var(--shadow-lg);
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ---------- AI 设置表单 ---------- */
.field-label { display: block; font-size: 12px; color: var(--text-2); font-weight: 700; margin: 12px 0 5px; letter-spacing: 0; }
.field {
  width: 100%; border: 1px solid var(--border-strong); border-radius: var(--radius-sm);
  padding: 10px 12px; font-size: 13.5px; font-family: inherit;
  background: var(--card); color: var(--text); outline: none;
  transition: border-color .15s ease, box-shadow .15s ease;
}
.field:focus { border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-soft); }
textarea.field { resize: vertical; line-height: 1.6; }
.ai-test-result {
  background: var(--card-2); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 12px; margin-top: 10px;
  font-size: 13px; line-height: 1.65; max-height: 280px; overflow: auto;
  white-space: pre-wrap;
}

/* ---------- 窄屏适配 ---------- */
@media (max-width: 400px) {
  #view { padding-left: 11px; padding-right: 11px; }
  .subject-card { padding: 15px 12px 12px; }
  .hero .hero-stats { gap: 16px; }
}
@media (min-width: 720px) {
  #view { padding-left: 22px; padding-right: 22px; }
  .subject-grid { grid-template-columns: repeat(3, 1fr); }
}

/* ---------- 可访问性 ---------- */
:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; border-radius: 4px; }

/* ---------- 结果页：筛选工具条 + 答题卡跳转 + 批量解析 ---------- */
.review-toolbar {
  position: sticky; top: 0; z-index: 60;
  display: flex; align-items: center; gap: 8px;
  padding: 10px 0 10px;
  background: var(--bg);
}
.rv-tabs { display: flex; gap: 6px; flex: 1; min-width: 0; overflow-x: auto; scrollbar-width: none; }
.rv-tabs::-webkit-scrollbar { display: none; }
.rv-tab {
  border: 1px solid var(--border); background: var(--card);
  color: var(--text-2); font-size: 12.5px; font-weight: 600;
  padding: 7px 12px; border-radius: 999px; cursor: pointer;
  white-space: nowrap; display: inline-flex; align-items: center; gap: 6px;
  transition: all .15s ease; flex: 0 0 auto;
}
.rv-tab b {
  font-size: 11px; background: var(--bg-soft); border-radius: 999px;
  padding: 1.5px 7px; font-variant-numeric: tabular-nums; font-weight: 700;
}
.rv-tab.active { background: var(--primary-fill); border-color: var(--primary-fill); color: #fff; }
.rv-tab.active b { background: rgba(255, 255, 255, .24); color: #fff; }
.rv-act { flex: 0 0 auto; }
.review-card { scroll-margin-top: 8px; }
.review-card.flash { animation: rvFlash 1.6s ease; }
@keyframes rvFlash {
  0%, 55% { box-shadow: 0 0 0 3px var(--primary); }
  100% { box-shadow: none; }
}
.answer-box .ab-body { white-space: normal; font-size: 13.5px; line-height: 1.8; }
.answer-box .ab-cache { color: var(--text-3); font-size: 11px; margin-left: 4px; }
.answer-box .ab-err { color: var(--red); }
.sheet-hint { margin-left: auto; color: var(--text-3); font-size: 11.5px; }

/* ---------- 成绩与解析：悬浮答题卡按钮（长卷滚动时始终可见） ---------- */
.review-fab {
  position: fixed; right: 16px; bottom: calc(76px + var(--safe-bottom, 0px));
  z-index: 150;
  display: flex; align-items: center; gap: 6px;
  padding: 12px 18px;
  border: none; border-radius: 999px;
  background: var(--primary-fill);
  color: #fff; font-size: 14px; font-weight: 700;
  cursor: pointer;
  box-shadow: 0 8px 20px var(--primary-shadow);
  transition: transform .12s ease, box-shadow .12s ease;
}
.review-fab:active { transform: scale(.95); box-shadow: 0 4px 12px var(--primary-shadow); }
/* review 页无底部导航：按钮更贴近底部 */
#view.no-bottom .review-fab { bottom: calc(20px + var(--safe-bottom, 0px)); }
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}

/* ============ 智能组卷 ============ */
.cfg-group { font-size: 12px; font-weight: 800; color: var(--text-2); margin: 14px 0 8px; display: flex; align-items: center; gap: 6px; }
.cfg-group:first-of-type { margin-top: 0; }
.cfg-banner { display: flex; align-items: center; gap: 7px; font-size: 12.5px; font-weight: 700; color: var(--primary); background: var(--primary-soft); padding: 10px 12px; border-radius: 10px; }
.cfg-note { font-weight: 600; color: var(--muted); font-size: 11px; }
.cfg-tip { margin-top: 12px; padding: 9px 11px; border-radius: 9px; background: var(--primary-soft); color: var(--primary); font-size: 12px; font-weight: 600; line-height: 1.5; display: flex; gap: 6px; align-items: flex-start; }
.cfg-row { margin-bottom: 4px; }
.chip-row { display: flex; gap: 8px; flex-wrap: wrap; }
.chip {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 7px 13px; border-radius: 999px; font-size: 12.5px; font-weight: 600;
  background: var(--bg-soft); color: var(--text-2); border: 1px solid transparent;
  cursor: pointer; transition: all .15s;
}
.chip:active { transform: scale(.95); }
.chip.on { background: var(--primary-fill); color: #fff; border-color: var(--primary-fill); }
.cfg-switch-row { display: flex; gap: 12px; align-items: flex-start; margin-top: 16px; padding: 12px; background: var(--bg-soft); border-radius: var(--radius-sm); }
.cfg-row-title { font-size: 13px; font-weight: 700; }
.cfg-row-sub { font-size: 11.5px; color: var(--muted); margin-top: 2px; line-height: 1.5; }
/* ===== 自定义刷题（专项练习标题行入口）===== */
.card-title-row { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin-bottom: 8px; }
.card-title-row .btn { white-space: nowrap; }
.num-stepper { display: flex; align-items: center; gap: 10px; width: 100%; padding: 14px 0 2px; }
.step-btn {
  flex: none; width: 34px; height: 34px; border-radius: 50%;
  border: 1px solid var(--border); background: var(--bg-soft); color: var(--text-1);
  font-size: 17px; font-weight: 700; line-height: 1; cursor: pointer; transition: all .15s;
  display: inline-flex; align-items: center; justify-content: center;
}
.step-btn:active { transform: scale(.92); }
.num-track { position: relative; flex: 1; height: 28px; cursor: pointer; touch-action: none; }
.num-track::before { content: ""; position: absolute; left: 8px; right: 8px; top: 50%; height: 6px; transform: translateY(-50%); border-radius: 999px; background: var(--border); }
.num-ticks { position: absolute; top: 0; left: 0; right: 0; bottom: 0; }
.num-ticks .tick { position: absolute; top: 50%; width: 3px; height: 9px; transform: translate(-50%, -50%); border-radius: 2px; background: var(--border); }
.num-thumb {
  position: absolute; top: 50%; left: 0; transform: translate(-50%, -50%);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  width: 46px; height: 40px; background: var(--primary-fill); color: #fff; border-radius: 12px;
  box-shadow: 0 2px 8px rgba(0,0,0,.18); user-select: none; touch-action: none;
}
.num-thumb b { font-size: 14px; line-height: 1.15; }
.num-thumb span { font-size: 9px; opacity: .85; line-height: 1.15; }
.switch { position: relative; display: inline-block; width: 42px; height: 24px; flex: none; margin-top: 2px; }
.switch input { opacity: 0; width: 0; height: 0; }
.switch-slider { position: absolute; top: 0; left: 0; right: 0; bottom: 0; border-radius: 999px; background: rgba(120,120,128,.32); transition: .2s; cursor: pointer; }
.switch-slider::before { content: ""; position: absolute; width: 20px; height: 20px; left: 2px; top: 2px; border-radius: 50%; background: #fff; transition: .2s; box-shadow: 0 1px 3px rgba(0,0,0,.25); }
.switch input:checked + .switch-slider { background: var(--primary-fill); }
.switch input:checked + .switch-slider::before { transform: translateX(18px); }
.btn-spinner {
  display: inline-block; width: 14px; height: 14px; vertical-align: -2px; margin-right: 6px;
  border: 2px solid rgba(255,255,255,.35); border-top-color: #fff; border-radius: 50%;
  animation: spin .7s linear infinite;
}
.pp-mod-list { display: flex; flex-direction: column; gap: 9px; margin-top: 10px; }
.pp-mod-row { display: flex; align-items: center; gap: 8px; font-size: 12.5px; }
.pp-mod-dot { width: 9px; height: 9px; border-radius: 999px; flex: none; }
.pp-mod-name { width: 96px; font-weight: 700; color: var(--text-1); flex: none; }
.pp-mod-bar { flex: 1; height: 7px; border-radius: 999px; background: var(--bg-soft); overflow: hidden; }
.pp-mod-bar .fill { display: block; height: 100%; border-radius: 999px; }
.pp-mod-num { font-weight: 700; color: var(--text-2); font-variant-numeric: tabular-nums; flex: none; }
.pp-q-list { display: flex; flex-direction: column; margin-top: 8px; }
.pp-q-item { display: flex; align-items: flex-start; gap: 10px; padding: 10px 2px; border-bottom: 1px solid var(--border); cursor: pointer; }
.pp-q-item:last-child { border-bottom: none; }
.pp-q-item:active { opacity: .6; }
.pp-q-num { width: 24px; height: 24px; flex: none; border-radius: 8px; background: var(--bg-soft); color: var(--text-2); font-size: 12px; font-weight: 700; display: flex; align-items: center; justify-content: center; margin-top: 1px; }
.pp-q-text { flex: 1; font-size: 13px; color: var(--text-1); line-height: 1.6; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.pp-q-tags { display: flex; flex-direction: column; gap: 4px; align-items: flex-end; flex: none; }
.pp-q-tags .tag { font-size: 10.5px; }
.opt-row { display: flex; gap: 10px; padding: 9px 10px; border-radius: 10px; border: 1.5px solid var(--border); margin-bottom: 7px; font-size: 13px; line-height: 1.6; align-items: flex-start; }
.opt-row.on { border-color: var(--green); background: var(--green-soft); }
.opt-key { width: 22px; height: 22px; flex: none; border-radius: 50%; background: var(--bg-soft); color: var(--text-2); font-size: 12px; font-weight: 800; display: flex; align-items: center; justify-content: center; margin-top: 1px; }
.opt-row.on .opt-key { background: var(--green); color: #fff; }
.opt-body { flex: 1; }

/* ===== 图片裁剪器（OCR 拍照/上传：裁剪 + 旋转） ===== */
.crop-overlay { position:fixed; top:0; left:0; right:0; bottom:0; width:100%; height:100%; z-index:9999; background:rgba(8,10,16,.65); display:flex; flex-direction:column; }
.crop-head { display:flex; align-items:center; gap:8px; padding:10px 14px; color:#fff; font-size:14px; font-weight:600; }
.crop-head .crop-title { flex:1; display:flex; align-items:center; gap:6px; }
.crop-head button { background:rgba(255,255,255,.14); color:#fff; border:none; border-radius:8px; padding:6px 12px; font-size:13px; cursor:pointer; display:flex; align-items:center; gap:4px; }
.crop-head button:active { background:rgba(255,255,255,.28); }
.crop-stage { flex:1; position:relative; overflow:hidden; }
.crop-stage canvas { position:absolute; top:0; left:0; right:0; bottom:0; width:100%; height:100%; touch-action:none; cursor:crosshair; }
.crop-foot { display:flex; gap:10px; padding:12px 14px; padding-bottom:calc(12px + env(safe-area-inset-bottom, 0px)); }
.crop-foot button { flex:1; border:none; border-radius:12px; padding:12px; font-size:14px; font-weight:600; cursor:pointer; display:flex; align-items:center; justify-content:center; gap:5px; }
.crop-foot .crop-retake, .crop-foot .crop-cancel { background:rgba(255,255,255,.14); color:#fff; }
.crop-foot .crop-ok { background:var(--primary-fill); color:#fff; }
.crop-foot button:disabled { opacity:.5; }

/* ===== OCR 多页图片队列缩略图 ===== */
.ocr-thumb { position:relative; width:64px; height:64px; border-radius:10px; overflow:hidden; border:1px solid var(--border); cursor:pointer; flex:none; }
.ocr-thumb img { width:100%; height:100%; object-fit:cover; display:block; }
.ocr-thumb-page { position:absolute; left:3px; bottom:3px; background:rgba(0,0,0,.65); color:#fff; font-size:10px; line-height:1; padding:3px 5px; border-radius:4px; font-weight:600; }
.ocr-thumb-del { position:absolute; top:2px; right:2px; width:19px; height:19px; line-height:17px; text-align:center; background:rgba(255,59,48,.92); color:#fff; border:none; border-radius:50%; font-size:13px; cursor:pointer; padding:0; font-weight:700; }
.ocr-thumb-del:active { background:var(--red); }
.ocr-add { width:64px; height:64px; border-radius:10px; border:1.5px dashed var(--border); background:rgba(128,128,128,.08); color:rgba(128,128,128,.55); font-size:28px; line-height:1; display:flex; align-items:center; justify-content:center; cursor:pointer; flex:none; user-select:none; }
.ocr-add:active { background:rgba(128,128,128,.18); color:rgba(128,128,128,.8); }

/* ===== 自定义题库（2026-08-15） ===== */
.custom-head { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; margin-bottom: 14px; }
.cb-title-row { flex: 1 1 100%; }
.cb-name.big { font-size: 19px; font-weight: 800; color: var(--text); }
.cb-meta { color: var(--muted); font-size: 12.5px; margin-left: 6px; font-weight: 500; }
.custom-toolbar { background: var(--card-2); border: 1px solid var(--border); border-radius: var(--radius); padding: 12px 14px; margin-bottom: 14px; display: flex; flex-direction: column; gap: 10px; }
.custom-hint { color: var(--text-2); font-size: 13px; }
.custom-toolbar-btns { display: flex; gap: 10px; flex-wrap: wrap; }
.custom-list { display: flex; flex-direction: column; gap: 10px; }
.custom-batch { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 12px 14px; display: flex; flex-direction: column; align-items: stretch; gap: 10px; }
.cb-top { display: flex; align-items: center; gap: 12px; cursor: pointer; min-width: 0; }
.cb-check-wrap { display: flex; align-items: center; }
.cb-check-wrap input { width: 18px; height: 18px; accent-color: var(--primary); }
.cb-main { flex: 1; min-width: 0; }
.cb-name { font-weight: 700; color: var(--text); font-size: 15px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; display: flex; align-items: center; gap: 8px; }
.cb-subject { flex: none; font-size: 11px; font-weight: 600; color: var(--primary); background: var(--primary-soft, rgba(0,122,255,.12)); border: 1px solid var(--primary-soft); border-radius: 999px; padding: 2px 9px; white-space: nowrap; }
.import-confirm { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.import-confirm select { flex: 0 0 auto; padding: 8px 10px; border-radius: 10px; border: 1px solid var(--border-strong); background: var(--card); color: var(--text); font-size: 13.5px; max-width: 200px; }
.cb-meta { color: var(--muted); font-size: 12.5px; }
.cb-actions { display: flex; gap: 6px; flex-wrap: wrap; justify-content: flex-end; }
.mini { font-size: 12.5px; padding: 5px 10px; border-radius: 9px; border: 1px solid var(--border); background: var(--card); color: var(--text-2); cursor: pointer; }
.mini.primary { background: var(--primary-fill); border-color: var(--primary-fill); color: #fff; }
.mini.danger { color: var(--red); border-color: var(--border); background: var(--red-soft); }
.mini svg { vertical-align: -2px; margin-right: 3px; }
.custom-qlist { display: flex; flex-direction: column; gap: 8px; }
.custom-q { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 10px 12px; display: flex; flex-direction: column; align-items: stretch; gap: 8px; }
.cq-body { display: flex; gap: 10px; flex: 1; min-width: 0; align-items: flex-start; cursor: pointer; }
.cq-no { min-width: 22px; height: 22px; border-radius: 50%; background: var(--primary-soft); color: var(--primary); font-size: 12px; font-weight: 700; display: flex; align-items: center; justify-content: center; }
.cq-main { min-width: 0; }
.cq-prompt { font-size: 13.5px; color: var(--text); line-height: 1.45; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.cq-meta { margin-top: 5px; display: flex; gap: 6px; flex-wrap: wrap; }
.tag { font-size: 11.5px; padding: 2px 8px; border-radius: 999px; background: var(--card-2); color: var(--text-3); border: 1px solid var(--border); }
.tag.ok { color: var(--green); background: var(--green-soft); border-color: var(--border-strong); }
.tag.warn { color: var(--amber); background: var(--amber-soft); border-color: var(--border-strong); }
.cq-actions { display: flex; gap: 6px; justify-content: flex-end; }
/* 导入预览卡片（AI 解析结果，导入前可逐题编辑） */
.pv-head { margin-bottom: 12px; }
.pv-title { font-size: 16px; font-weight: 800; color: var(--text); display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.pv-count { font-size: 13px; font-weight: 700; color: var(--primary); background: var(--primary-soft, rgba(0,122,255,.12)); border-radius: 999px; padding: 2px 10px; }
.pv-hint { margin-top: 4px; font-size: 12.5px; }
.pv-confirm { background: var(--card-2); border: 1px solid var(--border); border-radius: var(--radius); padding: 12px 14px; margin-bottom: 14px; display: flex; flex-direction: column; gap: 10px; }
.pv-name-label { font-weight: 800; font-size: 13.5px; color: var(--text); display: block; margin-bottom: 6px; }
.pv-name-row .muted { font-size: 12px; margin-top: 4px; }
.pv-meta-row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.pv-meta-row select { flex: 1 1 160px; padding: 10px; border-radius: var(--radius-sm); border: 1px solid var(--border-strong); background: var(--card); color: var(--text); font-size: 13.5px; }
.pv-list { display: flex; flex-direction: column; gap: 10px; }
.pv-card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 12px 14px; }
.pv-card.fail { border-color: rgba(255,149,0,.5); }
.pv-fail-banner { display: flex; align-items: center; gap: 6px; font-size: 12.5px; color: var(--amber); background: var(--amber-soft); border: 1px solid var(--amber-soft); border-radius: 10px; padding: 6px 10px; margin-bottom: 10px; }
.pv-card-head { display: flex; align-items: center; gap: 8px; margin-bottom: 8px; }
.pv-no { min-width: 24px; height: 24px; border-radius: 50%; background: var(--primary-soft); color: var(--primary); font-size: 12.5px; font-weight: 700; display: flex; align-items: center; justify-content: center; }
.pv-answer { font-size: 11.5px; padding: 2px 9px; border-radius: 999px; background: var(--card-2); color: var(--text-3); border: 1px solid var(--border); }
.pv-answer.ok { color: var(--green); background: var(--green-soft); border-color: var(--border-strong); }
.pv-actions { margin-left: auto; display: flex; gap: 6px; }
.pv-prompt { font-size: 14px; line-height: 1.55; color: var(--text); white-space: pre-wrap; word-break: break-word; }
.pv-opts { margin-top: 8px; display: flex; flex-direction: column; gap: 5px; }
.pv-opt { display: flex; gap: 8px; align-items: baseline; font-size: 13.5px; color: var(--text); line-height: 1.5; }
.pv-opt.ok { color: var(--green); font-weight: 600; }
.pv-opt-letter { flex: none; min-width: 18px; height: 18px; border-radius: 6px; background: var(--card-2); border: 1px solid var(--border); color: var(--text-2); font-size: 11.5px; font-weight: 700; display: inline-flex; align-items: center; justify-content: center; }
.pv-opt.ok .pv-opt-letter { background: var(--green-soft); color: var(--green); border-color: var(--border-strong); }
.pv-details { margin-top: 8px; }
.pv-details summary { cursor: pointer; font-size: 13px; font-weight: 600; color: var(--primary); padding: 4px 0; user-select: none; }
.pv-fold { font-size: 13px; color: var(--text-2); line-height: 1.6; white-space: pre-wrap; word-break: break-word; background: var(--card-2); border-radius: 10px; padding: 8px 10px; margin-top: 4px; }
.pv-no-fold { margin-top: 8px; font-size: 12px; color: var(--text-3); }
/* 预览卡图片（图片题：题干图/材料图缩略图 + 角色徽标） */
.pv-imgs { margin-top: 8px; display: flex; flex-direction: column; gap: 8px; }
.pv-img { display: flex; flex-direction: column; gap: 4px; }
.pv-img img { max-width: 100%; max-height: 220px; border-radius: 10px; border: 1px solid var(--border); background: var(--card-2); }
.pv-img-role { font-size: 11px; font-weight: 700; color: var(--primary); align-self: flex-start; }
/* 编辑弹窗图片区 */
.eq-images { display: flex; flex-direction: column; gap: 8px; margin-bottom: 8px; }
.eq-img { display: flex; align-items: center; gap: 10px; background: var(--card-2); border: 1px solid var(--border); border-radius: 10px; padding: 8px; }
.eq-img img { max-width: 140px; max-height: 100px; border-radius: 8px; background: var(--card); }
.eq-img select { padding: 6px 8px; border-radius: 8px; border: 1px solid var(--border-strong); background: var(--card); color: var(--text); font-size: 12.5px; }
.eq-img-add { display: block; text-align: center; margin-top: 4px; }
/* 题目详情弹窗 */
.qd-block { margin-top: 12px; }
.qd-label { font-size: 12px; font-weight: 700; color: var(--text-2); margin-bottom: 4px; }
.qd-content { font-size: 14px; line-height: 1.6; color: var(--text); white-space: pre-wrap; word-break: break-word; }
.qd-opts { display: flex; flex-direction: column; gap: 5px; }
.qd-opt { display: flex; gap: 8px; align-items: baseline; font-size: 13.5px; line-height: 1.5; color: var(--text); }
.qd-opt.ok { color: var(--green); font-weight: 600; }
.qd-opt-letter { flex: none; min-width: 18px; height: 18px; border-radius: 6px; background: var(--card-2); border: 1px solid var(--border); color: var(--text-2); font-size: 11.5px; font-weight: 700; display: inline-flex; align-items: center; justify-content: center; }
.qd-opt.ok .qd-opt-letter { background: var(--green-soft); color: var(--green); border-color: var(--border-strong); }
/* 编辑弹窗分区 */
.eq-section { margin-top: 12px; }
.eq-section-title { font-size: 13px; font-weight: 700; color: var(--text); margin-bottom: 6px; }
.eq-section-title .muted { font-weight: 500; }
.import-progress { margin-top: 10px; display: flex; align-items: center; gap: 10px; color: var(--text-2); font-size: 13px; }
.import-ok-progress { margin-top: 10px; display: flex; align-items: center; gap: 10px; }
.import-ok-progress[hidden] { display: none; }
.import-ok-bar { flex: 1; height: 8px; border-radius: 999px; background: var(--bg-soft); overflow: hidden; }
.import-ok-bar .fill { display: block; height: 100%; border-radius: 999px; background: var(--primary-fill); transition: width .18s ease; }
.import-ok-status { flex: none; font-size: 12.5px; color: var(--text-2); font-variant-numeric: tabular-nums; white-space: nowrap; }
.custom-preview-scroll { overflow-x: auto; max-height: 46vh; overflow-y: auto; border: 1px solid var(--border); border-radius: 10px; }
.custom-preview { border-collapse: collapse; width: 100%; font-size: 12.5px; min-width: 720px; }
.custom-preview th { position: sticky; top: 0; background: var(--card-2); color: var(--text-2); text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--border-strong); }
.custom-preview td { padding: 7px 10px; border-bottom: 1px solid var(--border); color: var(--text); vertical-align: top; }
.custom-preview tr.fail td { background: rgba(255,149,0,.06); }
.import-confirm { display: flex; gap: 10px; margin-top: 12px; flex-wrap: wrap; align-items: center; }
.import-confirm input { flex: 1; min-width: 200px; }
.sheet-wide .sheet { max-width: 680px; width: calc(100vw - 32px); }
.sheet label { display: block; font-size: 12.5px; color: var(--text-2); margin: 10px 0 4px; font-weight: 600; }
/* 表单控件统一（导入页 + 弹窗） */
.field-input, .field-area, .sheet textarea, .sheet input[type="text"] {
  width: 100%; box-sizing: border-box;
  border: 1px solid var(--border-strong); border-radius: var(--radius-sm);
  padding: 12px; font-size: 14px; line-height: 1.6; font-family: inherit;
  background: var(--card); color: var(--text); outline: none; resize: vertical;
  transition: border-color .15s ease, box-shadow .15s ease;
}
.field-input:focus, .field-area:focus, .sheet textarea:focus, .sheet input[type="text"]:focus {
  border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-soft);
}
/* 批次卡图标块（与科目卡同规格） */
.cb-ico {
  width: 44px; height: 44px; border-radius: 14px; flex: none;
  display: inline-flex; align-items: center; justify-content: center; color: #fff;
}
/* 导入页头部 */
.import-head { display: flex; gap: 12px; align-items: flex-start; margin-bottom: 14px; }
.import-head h3 { margin: 0; font-size: 16px; }
.import-head .muted { margin: 5px 0 0; font-size: 12.5px; line-height: 1.6; }
.import-ico {
  width: 44px; height: 44px; border-radius: 14px; flex: none;
  display: inline-flex; align-items: center; justify-content: center; color: #fff;
}
/* 文件拖放区 */
.import-dropzone {
  display: flex; flex-direction: column; align-items: center; gap: 7px;
  padding: 28px 16px; border: 1.5px dashed var(--border-strong); border-radius: var(--radius);
  cursor: pointer; text-align: center; color: var(--text-2);
  transition: border-color .15s ease, background .15s ease;
}
.import-dropzone:hover, .import-dropzone.drag { border-color: var(--primary); background: var(--primary-soft); color: var(--primary); }
.import-dropzone b { display: inline-flex; align-items: center; gap: 8px; color: var(--text); font-size: 14.5px; }
.import-dropzone span { font-size: 12px; color: var(--text-3); }
.import-file-input { display: none; }
.import-actions { margin-top: 12px; display: flex; justify-content: flex-end; }
/* 导入模式切换 */
.import-mode-bar { display: flex; align-items: center; gap: 8px; margin: 10px 0 0; padding: 0; }
.import-mode-label { font-size: 12.5px; color: var(--text-2); font-weight: 600; margin-right: 2px; white-space: nowrap; }
.import-mode-btn { font-size: 12.5px; padding: 6px 14px; border-radius: 999px; border: 1px solid var(--border); background: var(--card); color: var(--text-2); cursor: pointer; transition: all .15s ease; font-weight: 600; }
.import-mode-btn:hover { border-color: var(--primary); color: var(--primary); }
.import-mode-btn.active { background: var(--primary); color: #fff; border-color: var(--primary); }
/* 预览卡分类标签 */
.pv-category { font-size: 11px; font-weight: 600; color: var(--violet); background: var(--violet-soft, rgba(120,80,250,.12)); border: 1px solid var(--violet-soft, rgba(120,80,250,.15)); border-radius: 999px; padding: 2px 9px; white-space: nowrap; }
/* 危险操作图标（删除确认弹窗） */
.danger-ico {
  display: inline-flex; align-items: center; justify-content: center;
  width: 40px; height: 40px; border-radius: 12px; margin-right: 8px; vertical-align: middle;
  background: var(--red-soft); color: var(--red);
}
/* 危险主按钮（删除确认，纯色平涂） */
.btn-danger { background: var(--red); color: #fff; box-shadow: none; }
/* 弹窗操作按钮：sticky 常驻底部，内容再长也不至于找不到保存/取消 */
.sheet-actions {
  display: flex; gap: 10px; justify-content: flex-end;
  margin-top: 16px;
  position: sticky; bottom: 0; z-index: 2;
  background: var(--card);
  padding: 12px 0 0;
}

/* ============================================================
   统一图标块色板（iOS 系统色 · 纯色平涂）
   全部 .tint-* / .qg-* 图标块收敛到一套纯色，删除历史 52 处渐变声明
   组件族内的二次选择器确保覆盖各自的底色默认值
   ============================================================ */
.tint-violet { background: var(--violet); }
.tint-green  { background: var(--green); }
.tint-orange, .tint-amber { background: var(--amber); }
.tint-blue   { background: var(--primary); }
.tint-cyan   { background: var(--cyan); }
.tint-red    { background: var(--red); }
.qg-violet { background: var(--violet); }
.qg-green  { background: var(--green); }
.qg-coral, .qg-red { background: var(--red); }
.qg-amber, .qg-orange { background: var(--amber); }
.qg-blue   { background: var(--primary); }
.qg-cyan   { background: var(--cyan); }
.qg-violet, .qg-green, .qg-coral, .qg-amber, .qg-orange, .qg-blue, .qg-red, .qg-cyan { color: #fff; }
/* 组件族内：基础类自带底色时，用复合选择器保证 tint 覆盖 */
.li-icon.tint-violet { background: var(--violet); }
.li-icon.tint-green  { background: var(--green); }
.li-icon.tint-orange, .li-icon.tint-amber { background: var(--amber); }
.li-icon.tint-blue   { background: var(--primary); }
.li-icon.tint-red    { background: var(--red); }
.mg-ico.tint-violet { background: var(--violet); }
.mg-ico.tint-green  { background: var(--green); }
.mg-ico.tint-orange, .mg-ico.tint-amber { background: var(--amber); }
.mg-ico.tint-blue   { background: var(--primary); }
.ms-ico.tint-violet { background: var(--violet); }
.ms-ico.tint-green  { background: var(--green); }
.ms-ico.tint-orange, .ms-ico.tint-amber { background: var(--amber); }
.ms-ico.tint-blue   { background: var(--primary); }
/* ================= 笔记（2026-08-20） ================= */
/* 做题页底部操作条三按钮均分一行（添加笔记/查看解析/交卷） */
.action-row.tri .btn { flex: 1 1 calc(33.333% - 7px); white-space: nowrap; }
/* 做题页上一题/下一题（nav-pc）：桌面端 ≥720px 显示并与操作键均分一行；手机端隐藏（导航走滑动切题+答题卡），单题重练不出导航 */
.action-row .btn.nav-pc { display: none; }
@media (min-width: 720px) {
  .action-row .btn.nav-pc { display: inline-flex; align-items: center; justify-content: center; gap: 4px; }
  .action-row.tri.with-nav .btn { flex: 1 1 calc(20% - 8px); }
}
/* 笔记按钮绿色高亮态（与 .q-fav.on 同视觉语言，收藏=琥珀、笔记=绿） */
.btn.on { color: var(--green); border-color: var(--green); background: var(--green-soft); }
/* 笔记弹层输入框 */
.note-input {
  width: 100%; min-height: 120px; resize: vertical; box-sizing: border-box;
  padding: 10px 12px; border: 1px solid var(--border); border-radius: 10px;
  background: var(--bg-soft); color: var(--text);
  font-size: 14px; line-height: 1.7; font-family: inherit; margin-top: 12px;
}
.note-input:focus { outline: none; border-color: var(--primary); }
.note-count { text-align: right; font-size: 11px; color: var(--text-3); margin-top: 4px; }
/* 笔记列表：题面下笔记内容预览 */
.li-note {
  font-size: 13px; color: var(--text-2); background: var(--bg-soft);
  border: 1px solid var(--border); border-radius: 8px; padding: 6px 9px; margin-top: 6px;
  white-space: pre-wrap; word-break: break-all; max-height: 76px; overflow: hidden;
}