/* ==========================================================================
   在线考试系统 · 现代化设计系统
   Design Tokens + 通用组件
   ========================================================================== */

:root {
  /* 主色 —— 靛蓝渐变体系 */
  --primary-50:  #eef2ff;
  --primary-100: #e0e7ff;
  --primary-200: #c7d2fe;
  --primary-300: #a5b4fc;
  --primary-400: #818cf8;
  --primary-500: #6366f1;
  --primary-600: #4f46e5;
  --primary-700: #4338ca;
  --primary-800: #3730a3;
  --primary-900: #312e81;

  --primary: var(--primary-600);
  --primary-hover: var(--primary-700);
  --primary-soft: rgba(99, 102, 241, .10);

  /* 辅助色 */
  --success: #10b981;
  --success-soft: rgba(16, 185, 129, .12);
  --warning: #f59e0b;
  --warning-soft: rgba(245, 158, 11, .12);
  --danger:  #ef4444;
  --danger-soft: rgba(239, 68, 68, .12);
  --info:    #0ea5e9;
  --info-soft: rgba(14, 165, 233, .12);
  --purple:  #8b5cf6;
  --purple-soft: rgba(139, 92, 246, .12);

  /* 中性色 */
  --ink-900: #0f172a;
  --ink-800: #1e293b;
  --ink-700: #334155;
  --ink-600: #475569;
  --ink-500: #64748b;
  --ink-400: #94a3b8;
  --ink-300: #cbd5e1;
  --ink-200: #e2e8f0;
  --ink-100: #f1f5f9;
  --ink-50:  #f8fafc;
  --white: #ffffff;

  --text: var(--ink-800);
  --text-muted: var(--ink-500);
  --text-light: var(--ink-400);
  --border: #e6eaf2;
  --border-strong: #d6dce8;
  --bg: #f5f7fb;
  --surface: #ffffff;

  /* 圆角 */
  --r-xs: 6px;
  --r-sm: 8px;
  --r-md: 12px;
  --r-lg: 16px;
  --r-xl: 22px;
  --r-full: 999px;

  /* 阴影 */
  --shadow-xs: 0 1px 2px rgba(15, 23, 42, .05);
  --shadow-sm: 0 2px 8px rgba(15, 23, 42, .06);
  --shadow-md: 0 6px 20px rgba(15, 23, 42, .08);
  --shadow-lg: 0 14px 40px rgba(15, 23, 42, .12);
  --shadow-xl: 0 24px 60px rgba(15, 23, 42, .16);
  --shadow-primary: 0 8px 24px rgba(79, 70, 229, .28);

  --sidebar-w: 248px;
  --header-h: 62px;
  --ease: cubic-bezier(.4, 0, .2, 1);
}

/* ---------------------------------------------------------------- Reset */
*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
               "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  font-size: 14px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { color: var(--primary); text-decoration: none; transition: color .18s var(--ease); }
a:hover { color: var(--primary-700); }

h1, h2, h3, h4, h5, h6 { margin: 0; font-weight: 600; color: var(--ink-900); line-height: 1.35; }
p { margin: 0 0 10px; }
img { max-width: 100%; vertical-align: middle; }
ul, ol { margin: 0; padding-left: 20px; }

::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--ink-300); border-radius: var(--r-full); }
::-webkit-scrollbar-thumb:hover { background: var(--ink-400); }

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

/* -------- 侧边栏 -------- */
.sidebar {
  width: var(--sidebar-w);
  flex: 0 0 var(--sidebar-w);
  background: linear-gradient(180deg, #1e1b4b 0%, #312e81 55%, #1e1b4b 100%);
  color: #cbd5e1;
  position: fixed;
  inset: 0 auto 0 0;
  z-index: 900;
  display: flex;
  flex-direction: column;
  transition: transform .28s var(--ease);
  overflow: hidden;
}
.sidebar::after {
  content: '';
  position: absolute; inset: 0;
  background:
    radial-gradient(circle at 15% 8%, rgba(129, 140, 248, .28), transparent 42%),
    radial-gradient(circle at 85% 92%, rgba(56, 189, 248, .18), transparent 45%);
  pointer-events: none;
}
.sidebar-head {
  position: relative;
  z-index: 1;
  padding: 18px 20px;
  display: flex;
  align-items: center;
  gap: 12px;
  border-bottom: 1px solid rgba(255, 255, 255, .08);
  flex: 0 0 auto;
}
.sidebar-logo {
  width: 40px; height: 40px;
  border-radius: var(--r-md);
  background: linear-gradient(135deg, #818cf8, #38bdf8);
  display: grid; place-items: center;
  font-size: 19px; font-weight: 700; color: #fff;
  box-shadow: 0 6px 16px rgba(56, 189, 248, .35);
  overflow: hidden; flex: 0 0 auto;
}
.sidebar-logo img { width: 100%; height: 100%; object-fit: cover; }
.sidebar-brand { min-width: 0; }
.sidebar-brand b { display: block; color: #fff; font-size: 15px; font-weight: 600;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.sidebar-brand span { display: block; font-size: 11px; color: #a5b4fc; letter-spacing: .4px;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

.sidebar-nav { position: relative; z-index: 1; flex: 1 1 auto; overflow-y: auto; padding: 12px 12px 24px; }
.sidebar-nav::-webkit-scrollbar { width: 5px; }
.sidebar-nav::-webkit-scrollbar-thumb { background: rgba(255,255,255,.18); }

.nav-group-title {
  font-size: 11px; text-transform: uppercase; letter-spacing: .9px;
  color: #818cf8; padding: 16px 12px 7px; font-weight: 600;
}
.nav-item {
  display: flex; align-items: center; gap: 11px;
  padding: 10px 12px; margin-bottom: 3px;
  border-radius: var(--r-sm);
  color: #cbd5e1; font-size: 13.5px;
  cursor: pointer; position: relative;
  transition: all .18s var(--ease);
  user-select: none;
}
.nav-item:hover { background: rgba(255,255,255,.08); color: #fff; }
.nav-item.active {
  background: linear-gradient(90deg, rgba(129,140,248,.35), rgba(129,140,248,.12));
  color: #fff; font-weight: 500;
}
.nav-item.active::before {
  content: ''; position: absolute; left: 0; top: 50%; transform: translateY(-50%);
  width: 3px; height: 18px; border-radius: 0 3px 3px 0; background: #818cf8;
}
.nav-icon { width: 18px; text-align: center; flex: 0 0 18px; opacity: .92; }
.nav-text { flex: 1; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.nav-arrow { font-size: 10px; opacity: .55; transition: transform .22s var(--ease); }
.nav-item.open .nav-arrow { transform: rotate(90deg); }
.nav-sub { max-height: 0; overflow: hidden; transition: max-height .26s var(--ease); }
.nav-sub.open { max-height: 480px; }
.nav-sub .nav-item { padding-left: 42px; font-size: 13px; color: #a5b4fc; }
.nav-sub .nav-item.active { color: #fff; }

/* -------- 主区域 -------- */
.main { flex: 1 1 auto; min-width: 0; margin-left: var(--sidebar-w); display: flex; flex-direction: column; }

.topbar {
  height: var(--header-h);
  background: rgba(255,255,255,.86);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center; gap: 14px;
  padding: 0 22px;
  position: sticky; top: 0; z-index: 800;
}
.topbar-toggle {
  display: none; width: 38px; height: 38px; border: 1px solid var(--border);
  background: #fff; border-radius: var(--r-sm); cursor: pointer;
  font-size: 17px; color: var(--ink-600); place-items: center;
}
.topbar-title { font-size: 15.5px; font-weight: 600; color: var(--ink-900); }
.topbar-title small { display: block; font-size: 12px; color: var(--text-light); font-weight: 400; }
.topbar-spacer { flex: 1; }

.topbar-user { display: flex; align-items: center; gap: 9px; padding: 5px 12px 5px 5px;
  border-radius: var(--r-full); cursor: pointer; transition: background .18s var(--ease); position: relative; }
.topbar-user:hover { background: var(--ink-100); }
.avatar {
  width: 32px; height: 32px; border-radius: var(--r-full);
  background: linear-gradient(135deg, var(--primary-500), #38bdf8);
  color: #fff; display: grid; place-items: center; font-size: 13px; font-weight: 600; flex: 0 0 auto;
}
.topbar-user-name { font-size: 13.5px; font-weight: 500; }
.topbar-user-role { font-size: 11px; color: var(--text-light); }

.dropdown {
  position: absolute; top: calc(100% + 10px); right: 0; min-width: 178px;
  background: #fff; border: 1px solid var(--border); border-radius: var(--r-md);
  box-shadow: var(--shadow-lg); padding: 6px; opacity: 0; visibility: hidden;
  transform: translateY(-6px); transition: all .18s var(--ease); z-index: 900;
}
.dropdown.show { opacity: 1; visibility: visible; transform: translateY(0); }
.dropdown a {
  display: flex; align-items: center; gap: 9px; padding: 9px 12px;
  border-radius: var(--r-sm); color: var(--text); font-size: 13.5px;
}
.dropdown a:hover { background: var(--ink-100); color: var(--primary); }
.dropdown hr { border: 0; border-top: 1px solid var(--border); margin: 5px 0; }

.content { flex: 1 1 auto; padding: 22px; max-width: 1560px; width: 100%; }

.page-head { display: flex; align-items: flex-start; gap: 16px; flex-wrap: wrap; margin-bottom: 20px; }
.page-head h2 { font-size: 21px; letter-spacing: -.3px; }
.page-head p { color: var(--text-muted); font-size: 13px; margin: 3px 0 0; }
.page-head-actions { margin-left: auto; display: flex; gap: 9px; flex-wrap: wrap; }

/* ================================================================ 卡片 */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-sm);
  margin-bottom: 18px;
  overflow: hidden;
}
.card-head {
  padding: 15px 20px;
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
}
.card-head h3 { font-size: 15px; display: flex; align-items: center; gap: 8px; }
.card-head h3::before {
  content: ''; width: 3px; height: 15px; border-radius: 2px;
  background: linear-gradient(180deg, var(--primary-500), var(--primary-700));
}
.card-head .spacer { flex: 1; }
.card-body { padding: 20px; }
.card-body.tight { padding: 0; }
.card-foot { padding: 14px 20px; border-top: 1px solid var(--border); background: var(--ink-50); }

/* ================================================================ 统计卡 */
.stat-grid {
  display: grid; gap: 16px; margin-bottom: 18px;
  grid-template-columns: repeat(auto-fill, minmax(215px, 1fr));
}
/* 首页 / 历史成绩：5 张统计卡在大屏强制排成一行（原 auto-fill 在中等宽度会 4+1 换行） */
.stat-grid.cols-5 { grid-template-columns: repeat(5, minmax(0, 1fr)); }
@media (max-width: 1100px) { .stat-grid.cols-5 { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
@media (max-width: 768px)  { .stat-grid.cols-5 { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 420px)  { .stat-grid.cols-5 { grid-template-columns: 1fr; } }
.stat-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--r-lg); padding: 18px 20px;
  position: relative; overflow: hidden;
  transition: all .22s var(--ease);
}
.stat-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); border-color: var(--primary-200); }
.stat-card::after {
  content: ''; position: absolute; right: -34px; top: -34px;
  width: 104px; height: 104px; border-radius: 50%;
  background: var(--primary-soft); opacity: .75;
}
.stat-icon {
  width: 42px; height: 42px; border-radius: var(--r-md);
  display: grid; place-items: center; font-size: 20px;
  margin-bottom: 13px; position: relative; z-index: 1;
}
.stat-label { font-size: 12.5px; color: var(--text-muted); margin-bottom: 5px; position: relative; z-index: 1; }
.stat-value { font-size: 27px; font-weight: 700; color: var(--ink-900); letter-spacing: -.6px;
  line-height: 1.15; position: relative; z-index: 1; }
.stat-value small { font-size: 13px; font-weight: 500; color: var(--text-light); margin-left: 3px; }
.stat-foot { font-size: 12px; color: var(--text-light); margin-top: 7px; position: relative; z-index: 1; }

.c-primary { background: var(--primary-soft); color: var(--primary); }
.c-success { background: var(--success-soft); color: var(--success); }
.c-warning { background: var(--warning-soft); color: var(--warning); }
.c-danger  { background: var(--danger-soft);  color: var(--danger); }
.c-info    { background: var(--info-soft);    color: var(--info); }
.c-purple  { background: var(--purple-soft);  color: var(--purple); }

/* ================================================================ 按钮 */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 7px;
  padding: 9px 17px; border-radius: var(--r-sm);
  border: 1px solid transparent; background: var(--primary); color: #fff;
  font-size: 13.5px; font-weight: 500; font-family: inherit;
  cursor: pointer; white-space: nowrap;
  transition: all .18s var(--ease);
  line-height: 1.45;
  vertical-align: middle;
}
.btn:hover { background: var(--primary-hover); color: #fff; transform: translateY(-1px); box-shadow: var(--shadow-primary); }
.btn:active { transform: translateY(0); }
.btn:disabled, .btn.disabled { opacity: .55; cursor: not-allowed; transform: none !important; box-shadow: none !important; }

.btn-primary { background: linear-gradient(135deg, var(--primary-500), var(--primary-700)); }
.btn-success { background: var(--success); }
.btn-success:hover { background: #059669; box-shadow: 0 8px 22px rgba(16,185,129,.3); }
.btn-warning { background: var(--warning); }
.btn-warning:hover { background: #d97706; box-shadow: 0 8px 22px rgba(245,158,11,.3); }
.btn-danger  { background: var(--danger); }
.btn-danger:hover  { background: #dc2626; box-shadow: 0 8px 22px rgba(239,68,68,.3); }
.btn-info    { background: var(--info); }
.btn-info:hover    { background: #0284c7; box-shadow: 0 8px 22px rgba(14,165,233,.3); }

.btn-light {
  background: #fff; color: var(--ink-700); border-color: var(--border-strong);
}
.btn-light:hover { background: var(--ink-50); color: var(--primary); border-color: var(--primary-300); box-shadow: var(--shadow-sm); }

.btn-ghost { background: transparent; color: var(--text-muted); }
.btn-ghost:hover { background: var(--ink-100); color: var(--primary); box-shadow: none; }

.btn-outline { background: transparent; color: var(--primary); border-color: var(--primary-300); }
.btn-outline:hover { background: var(--primary-soft); color: var(--primary-700); box-shadow: none; }

.btn-sm { padding: 6px 12px; font-size: 12.5px; border-radius: var(--r-xs); }
.btn-xs { padding: 3px 9px;  font-size: 12px;   border-radius: var(--r-xs); }
.btn-lg { padding: 12px 26px; font-size: 15px; border-radius: var(--r-md); }
.btn-block { width: 100%; }

.btn-group { display: inline-flex; gap: 6px; flex-wrap: wrap; }

/* ================================================================ 表单 */
.form-row { margin-bottom: 17px; }
.form-grid { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.form-grid.cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.form-grid.cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.form-grid .span-2 { grid-column: span 2; }
.form-grid .span-all { grid-column: 1 / -1; }

label.lbl {
  display: block; font-size: 13px; font-weight: 500;
  color: var(--ink-700); margin-bottom: 7px;
}
label.lbl .req { color: var(--danger); margin-left: 2px; }
label.lbl .hint { font-weight: 400; color: var(--text-light); font-size: 12px; margin-left: 6px; }

.input, .select, .textarea {
  width: 100%; padding: 9px 13px;
  border: 1px solid var(--border-strong); border-radius: var(--r-sm);
  background: #fff; color: var(--text);
  font-size: 13.5px; font-family: inherit;
  transition: all .18s var(--ease);
  outline: none;
}
.input:hover, .select:hover, .textarea:hover { border-color: var(--ink-300); }
.input:focus, .select:focus, .textarea:focus {
  border-color: var(--primary-400);
  box-shadow: 0 0 0 3.5px var(--primary-soft);
}
.input::placeholder, .textarea::placeholder { color: var(--ink-400); }
.input:disabled, .select:disabled { background: var(--ink-100); cursor: not-allowed; color: var(--text-light); }
.textarea { resize: vertical; min-height: 88px; line-height: 1.65; }

.select {
  appearance: none; -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='M2.5 4.5L6 8l3.5-3.5' stroke='%2364748b' stroke-width='1.6' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 34px;
}
.input-sm { padding: 6px 11px; font-size: 13px; }
.input-lg { padding: 12px 15px; font-size: 15px; }
.input-group { display: flex; }
.input-group .input { border-radius: var(--r-sm) 0 0 var(--r-sm); }
.input-group .btn { border-radius: 0 var(--r-sm) var(--r-sm) 0; }

.form-hint { font-size: 12px; color: var(--text-light); margin-top: 6px; }
.form-error { font-size: 12px; color: var(--danger); margin-top: 6px; }

/* 复选框 / 单选框 */
.check {
  display: inline-flex; align-items: center; gap: 8px;
  cursor: pointer; font-size: 13.5px; user-select: none;
}
.check input[type=checkbox], .check input[type=radio] {
  width: 17px; height: 17px; accent-color: var(--primary-600);
  cursor: pointer; flex: 0 0 auto; margin: 0;
}
.check-group { display: flex; gap: 18px; flex-wrap: wrap; }

/* 开关 */
.switch { display: inline-flex; align-items: center; gap: 10px; cursor: pointer; user-select: none; }
.switch input { display: none; }
.switch .track {
  width: 44px; height: 25px; border-radius: var(--r-full);
  background: var(--ink-300); position: relative; transition: background .22s var(--ease); flex: 0 0 auto;
}
.switch .track::after {
  content: ''; position: absolute; top: 3px; left: 3px;
  width: 19px; height: 19px; border-radius: 50%; background: #fff;
  box-shadow: 0 1px 4px rgba(0,0,0,.22); transition: transform .22s var(--ease);
}
.switch input:checked + .track { background: var(--primary-600); }
.switch input:checked + .track::after { transform: translateX(19px); }
.switch .switch-label { font-size: 13.5px; color: var(--ink-700); }

/* 单选卡片组 */
.radio-cards { display: grid; gap: 11px; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); }
.radio-card {
  border: 1.5px solid var(--border-strong); border-radius: var(--r-md);
  padding: 13px 15px; cursor: pointer; transition: all .18s var(--ease);
  background: #fff; position: relative;
}
.radio-card:hover { border-color: var(--primary-300); background: var(--primary-50); }
.radio-card input { position: absolute; opacity: 0; }
.radio-card .rc-title { font-size: 13.5px; font-weight: 600; color: var(--ink-800); display: flex; align-items: center; gap: 8px; }
.radio-card .rc-desc { font-size: 12px; color: var(--text-light); margin-top: 4px; line-height: 1.55; }
.radio-card:has(input:checked) {
  border-color: var(--primary-500); background: var(--primary-50);
  box-shadow: 0 0 0 3.5px var(--primary-soft);
}
.radio-card:has(input:checked) .rc-title { color: var(--primary-700); }

/* ================================================================ 表格 */
.table-wrap { width: 100%; overflow-x: auto; -webkit-overflow-scrolling: touch; }
table.tbl { width: 100%; border-collapse: collapse; font-size: 13.5px; }
table.tbl th {
  background: var(--ink-50); color: var(--ink-600);
  font-weight: 600; font-size: 12.5px; text-align: left;
  padding: 11px 14px; white-space: nowrap;
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 2;
}
table.tbl td {
  padding: 11px 14px; border-bottom: 1px solid var(--ink-100);
  vertical-align: middle;
}
table.tbl tbody tr { transition: background .14s var(--ease); }
table.tbl tbody tr:hover { background: var(--primary-50); }
table.tbl tbody tr:last-child td { border-bottom: 0; }
table.tbl td.num, table.tbl th.num { text-align: right; font-variant-numeric: tabular-nums; }
table.tbl td.center, table.tbl th.center { text-align: center; }
table.tbl .row-title { font-weight: 500; color: var(--ink-800); }
/* 长标题列：限制最大宽度，避免把同排其它列挤成竖排文字 */
.paper-cell { max-width: 200px; }
table.tbl .row-sub { font-size: 12px; color: var(--text-light); margin-top: 2px; }

.empty-state { padding: 54px 20px; text-align: center; color: var(--text-light); }
.empty-state .icon { font-size: 42px; opacity: .35; margin-bottom: 12px; display: block; }
.empty-state p { font-size: 13.5px; margin: 0; }

/* ================================================================ 徽章 */
.badge {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 3px 10px; border-radius: var(--r-full);
  font-size: 12px; font-weight: 500; line-height: 1.55; white-space: nowrap;
}
.badge-primary { background: var(--primary-soft); color: var(--primary-700); }
.badge-success { background: var(--success-soft); color: #047857; }
.badge-warning { background: var(--warning-soft); color: #b45309; }
.badge-danger  { background: var(--danger-soft);  color: #b91c1c; }
.badge-info    { background: var(--info-soft);    color: #0369a1; }
.badge-purple  { background: var(--purple-soft);  color: #6d28d9; }
.badge-gray    { background: var(--ink-100);      color: var(--ink-600); }
.badge-dot::before {
  content: ''; width: 6px; height: 6px; border-radius: 50%;
  background: currentColor; flex: 0 0 auto;
}

/* ================================================================ 提示 */
.alert {
  display: flex; align-items: center; gap: 10px;
  padding: 12px 16px; border-radius: var(--r-md);
  font-size: 13.5px; margin-bottom: 16px;
  border: 1px solid transparent;
}
.alert-success { background: var(--success-soft); color: #047857; border-color: rgba(16,185,129,.24); }
.alert-danger  { background: var(--danger-soft);  color: #b91c1c; border-color: rgba(239,68,68,.24); }
.alert-warning { background: var(--warning-soft); color: #b45309; border-color: rgba(245,158,11,.24); }
.alert-info    { background: var(--info-soft);    color: #0369a1; border-color: rgba(14,165,233,.24); }
.alert-close { margin-left: auto; background: none; border: 0; font-size: 19px;
  cursor: pointer; color: inherit; opacity: .6; line-height: 1; padding: 0 4px; }
.alert-close:hover { opacity: 1; }

/* ================================================================ 分页 */
.pager { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; padding: 16px 20px; }
.pager .info { font-size: 13px; color: var(--text-muted); margin-right: auto; }
.pager a, .pager span.pg {
  min-width: 34px; height: 34px; padding: 0 11px;
  display: inline-flex; align-items: center; justify-content: center;
  border: 1px solid var(--border-strong); border-radius: var(--r-sm);
  background: #fff; color: var(--ink-600); font-size: 13px;
  transition: all .16s var(--ease);
}
.pager a:hover { border-color: var(--primary-400); color: var(--primary); background: var(--primary-50); }
.pager .active { background: var(--primary-600); border-color: var(--primary-600); color: #fff; font-weight: 600; }
.pager .disabled { opacity: .45; pointer-events: none; }

/* ================================================================ 模态框 */
.modal-mask {
  position: fixed; inset: 0; z-index: 1200;
  background: rgba(15, 23, 42, .52);
  backdrop-filter: blur(3px); -webkit-backdrop-filter: blur(3px);
  display: flex; align-items: center; justify-content: center;
  padding: 20px; opacity: 0; visibility: hidden;
  transition: all .22s var(--ease);
}
.modal-mask.show { opacity: 1; visibility: visible; }
.modal {
  background: #fff; border-radius: var(--r-lg);
  width: 100%; max-width: 560px; max-height: 90vh;
  display: flex; flex-direction: column;
  box-shadow: var(--shadow-xl);
  transform: translateY(16px) scale(.97);
  transition: transform .24s var(--ease);
}
.modal-mask.show .modal { transform: translateY(0) scale(1); }
.modal.modal-lg { max-width: 860px; }
.modal.modal-xl { max-width: 1100px; }
.modal-head {
  padding: 17px 22px; border-bottom: 1px solid var(--border);
  display: flex; align-items: center; gap: 12px;
}
.modal-head h3 { font-size: 16px; }
.modal-head .modal-close {
  margin-left: auto; background: none; border: 0; font-size: 22px;
  color: var(--ink-400); cursor: pointer; line-height: 1; padding: 0 5px;
  border-radius: var(--r-xs); transition: all .16s var(--ease);
}
.modal-head .modal-close:hover { color: var(--danger); background: var(--danger-soft); }
.modal-body { padding: 22px; overflow-y: auto; flex: 1 1 auto; }
.modal-foot {
  padding: 15px 22px; border-top: 1px solid var(--border);
  display: flex; gap: 10px; justify-content: flex-end; background: var(--ink-50);
  border-radius: 0 0 var(--r-lg) var(--r-lg);
}

/* ================================================================ 标签页 */
.tabs { display: flex; gap: 3px; border-bottom: 1.5px solid var(--border); margin-bottom: 20px; overflow-x: auto; }
.tabs::-webkit-scrollbar { height: 0; }
.tab {
  padding: 10px 17px; font-size: 13.5px; font-weight: 500;
  color: var(--text-muted); cursor: pointer; white-space: nowrap;
  border-bottom: 2.5px solid transparent; margin-bottom: -1.5px;
  transition: all .18s var(--ease);
}
.tab:hover { color: var(--primary); }
.tab.active { color: var(--primary-700); border-bottom-color: var(--primary-600); }
.tab-pane { display: none; }
.tab-pane.active { display: block; animation: fadeUp .3s var(--ease); }

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(7px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes spin { to { transform: rotate(360deg); } }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: .45; } }

/* ================================================================ 题目渲染 */
.q-item {
  padding: 20px; border-bottom: 1px solid var(--ink-100);
  transition: background .18s var(--ease);
}
.q-item:last-child { border-bottom: 0; }
.q-item.marked { background: var(--warning-soft); }

.q-head { display: flex; gap: 10px; margin-bottom: 14px; align-items: flex-start; }
.q-no {
  flex: 0 0 auto; min-width: 26px; height: 26px; padding: 0 7px;
  border-radius: var(--r-sm); background: var(--primary-soft); color: var(--primary-700);
  font-size: 12.5px; font-weight: 700; display: grid; place-items: center;
}
.q-title { flex: 1; font-size: 15px; line-height: 1.7; color: var(--ink-800); word-break: break-word; }
.q-title img { max-width: min(100%, 460px); border-radius: var(--r-sm); margin-top: 8px; display: block; border: 1px solid var(--border); }
.q-meta { display: flex; gap: 7px; flex-wrap: wrap; margin-top: 8px; }
.q-score { color: var(--text-light); font-size: 12.5px; margin-left: 4px; white-space: nowrap; }

.opts { display: flex; flex-direction: column; gap: 9px; padding-left: 36px; }
.opt {
  display: flex; align-items: flex-start; gap: 12px;
  padding: 12px 15px; border: 1.5px solid var(--border);
  border-radius: var(--r-md); cursor: pointer;
  transition: all .16s var(--ease); background: #fff;
}
.opt:hover { border-color: var(--primary-300); background: var(--primary-50); }
.opt input { margin: 0; flex: 0 0 auto; width: 17px; height: 17px; accent-color: var(--primary-600); margin-top: 2px; }
.opt-key {
  flex: 0 0 auto; width: 25px; height: 25px; border-radius: 50%;
  border: 1.5px solid var(--border-strong); color: var(--ink-500);
  display: grid; place-items: center; font-size: 12.5px; font-weight: 600;
  transition: all .16s var(--ease);
}
.opt-text { flex: 1; font-size: 14px; line-height: 1.65; color: var(--ink-700); word-break: break-word; }
.opt-text img { max-width: min(100%, 340px); border-radius: var(--r-xs); margin-top: 7px; display: block; }
.opt.selected { border-color: var(--primary-500); background: var(--primary-50); }
.opt.selected .opt-key { background: var(--primary-600); border-color: var(--primary-600); color: #fff; }
.opt.correct { border-color: var(--success); background: var(--success-soft); }
.opt.correct .opt-key { background: var(--success); border-color: var(--success); color: #fff; }
.opt.wrong { border-color: var(--danger); background: var(--danger-soft); }
.opt.wrong .opt-key { background: var(--danger); border-color: var(--danger); color: #fff; }
.opt.correct .opt-text, .opt.wrong .opt-text { color: var(--ink-800); font-weight: 500; }
.opt-flag { margin-left: auto; font-size: 12px; font-weight: 600; white-space: nowrap; flex: 0 0 auto; }
.opt-flag.ok { color: var(--success); }
.opt-flag.no { color: var(--danger); }

.answer-tip {
  margin: 12px 0 0 36px; padding: 11px 14px;
  background: var(--ink-50); border-left: 3px solid var(--primary-400);
  border-radius: 0 var(--r-sm) var(--r-sm) 0; font-size: 13px; color: var(--ink-600);
}
.answer-tip b { color: var(--success); }
.answer-tip .my { color: var(--danger); }
.answer-tip .analysis { display: block; margin-top: 8px; padding-top: 8px;
  border-top: 1px dashed var(--border-strong); color: var(--ink-600); line-height: 1.7; }

/* ================================================================ 工具类 */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.gap-4 { gap: 4px; } .gap-6 { gap: 6px; } .gap-8 { gap: 8px; } .gap-12 { gap: 12px; } .gap-16 { gap: 16px; }
.wrap { flex-wrap: wrap; }
.flex-1 { flex: 1; }
.ml-auto { margin-left: auto; }
.mt-0 { margin-top: 0; } .mt-8 { margin-top: 8px; } .mt-12 { margin-top: 12px; }
.mt-16 { margin-top: 16px; } .mt-20 { margin-top: 20px; } .mt-24 { margin-top: 24px; }
.mb-0 { margin-bottom: 0; } .mb-8 { margin-bottom: 8px; } .mb-12 { margin-bottom: 12px; }
.mb-16 { margin-bottom: 16px; } .mb-20 { margin-bottom: 20px; }
.text-muted { color: var(--text-muted); }
.text-light { color: var(--text-light); }
.text-primary { color: var(--primary); }
.text-success { color: var(--success); }
.text-danger { color: var(--danger); }
.text-warning { color: var(--warning); }
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-sm { font-size: 12.5px; }
.text-lg { font-size: 16px; }
.fw-600 { font-weight: 600; }
.fw-700 { font-weight: 700; }
.nowrap { white-space: nowrap; }
.hidden { display: none !important; }
.divider { border: 0; border-top: 1px solid var(--border); margin: 18px 0; }
.mono { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
.score-big { font-size: 30px; font-weight: 700; letter-spacing: -.8px; line-height: 1.1; }

/* ================================================================ 阅卷方式卡片 */
.marking-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 14px;
  margin-bottom: 4px;
}
.marking-card {
  position: relative;
  display: flex;
  gap: 13px;
  padding: 16px 17px;
  border: 2px solid var(--border);
  border-radius: var(--r-lg);
  background: var(--surface);
  cursor: pointer;
  transition: border-color .2s var(--ease), box-shadow .2s var(--ease), transform .2s var(--ease), background .2s var(--ease);
}
.marking-card:hover {
  border-color: var(--primary-300, #a5b4fc);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.marking-card.active {
  border-color: var(--primary-600);
  background: linear-gradient(180deg, rgba(79,70,229,.06), rgba(79,70,229,.015));
  box-shadow: 0 0 0 4px rgba(79,70,229,.1), var(--shadow-md);
}
.marking-card input[type=radio] {
  position: absolute; opacity: 0; pointer-events: none; width: 0; height: 0;
}
.marking-card .mc-icon {
  flex: 0 0 auto;
  width: 42px; height: 42px;
  border-radius: 12px;
  display: grid; place-items: center;
  font-size: 20px;
  background: var(--ink-100, #f1f5f9);
  border: 1px solid var(--border);
  transition: all .2s var(--ease);
}
.marking-card.active .mc-icon {
  background: linear-gradient(135deg, var(--primary-500), #38bdf8);
  border-color: transparent;
  box-shadow: 0 4px 12px rgba(79,70,229,.28);
}
.marking-card .mc-body { flex: 1 1 auto; min-width: 0; }
.marking-card .mc-title {
  font-size: 14.5px; font-weight: 700; color: var(--text);
  display: flex; align-items: center; gap: 7px; margin-bottom: 5px;
}
.marking-card.active .mc-title { color: var(--primary-700, #4338ca); }
.marking-card .mc-desc {
  font-size: 12.8px; color: var(--text-muted); line-height: 1.62; margin-bottom: 10px;
}
.marking-card .mc-rules { display: flex; flex-wrap: wrap; gap: 6px; }
.marking-card .mc-rule {
  font-size: 11.5px; font-weight: 600;
  padding: 3px 9px; border-radius: 20px;
  border: 1px solid transparent; white-space: nowrap;
}
.mc-rule.ok   { background: #dcfce7; color: #15803d; border-color: #bbf7d0; }
.mc-rule.warn { background: #fef3c7; color: #b45309; border-color: #fde68a; }
.mc-rule.lock { background: #e0e7ff; color: #4338ca; border-color: #c7d2fe; }

/* ================================================================ 响应式 */
.sidebar-mask {
  display: none; position: fixed; inset: 0; background: rgba(15,23,42,.45);
  z-index: 899; opacity: 0; transition: opacity .25s var(--ease);
}
.sidebar-mask.show { display: block; opacity: 1; }

@media (max-width: 1024px) {
  .sidebar { transform: translateX(-100%); box-shadow: var(--shadow-xl); }
  .sidebar.open { transform: translateX(0); }
  .main { margin-left: 0; }
  .topbar-toggle { display: grid; }
  .content { padding: 16px; }
  .form-grid.cols-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 768px) {
  body { font-size: 14px; }
  .content { padding: 13px; }
  .topbar { padding: 0 14px; gap: 10px; }
  .topbar-title { font-size: 14.5px; }
  .topbar-user-name, .topbar-user-role { display: none; }
  .topbar-user { padding: 4px; }
  .page-head { gap: 10px; margin-bottom: 15px; }
  .page-head h2 { font-size: 18px; }
  .page-head-actions { width: 100%; margin-left: 0; }
  .page-head-actions .btn { flex: 1; }
  .stat-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 11px; }
  .stat-card { padding: 14px 15px; }
  .stat-value { font-size: 22px; }
  .stat-icon { width: 36px; height: 36px; font-size: 17px; margin-bottom: 10px; }
  .form-grid.cols-2, .form-grid.cols-3 { grid-template-columns: 1fr; }
  .form-grid .span-2 { grid-column: span 1; }
  .card { border-radius: var(--r-md); }
  .card-body { padding: 15px; }
  .card-head { padding: 13px 15px; }
  .opts { padding-left: 0; }
  .answer-tip { margin-left: 0; }
  .q-item { padding: 15px; }
  .q-title { font-size: 14.5px; }
  .table-wrap { margin: 0 -15px; width: calc(100% + 30px); }
  table.tbl th, table.tbl td { padding: 10px 12px; }
  .modal { max-width: 100%; max-height: 92vh; }
  .modal-body { padding: 16px; }
  .modal-head, .modal-foot { padding: 14px 16px; }
  .pager { padding: 13px 15px; }
  .pager .info { width: 100%; margin-bottom: 8px; }
  .radio-cards { grid-template-columns: 1fr; }
  .marking-cards { grid-template-columns: 1fr; }
  .marking-card { padding: 14px 14px; gap: 11px; }
  .marking-card .mc-icon { width: 38px; height: 38px; font-size: 18px; border-radius: 10px; }
}

/* ================================================================
   窄屏（手机）后台适配：列表表格转为卡片，免去横向拖动与缩放
   ================================================================ */
@media (max-width: 640px) {
  /* 表格容器不再贴边溢出，卡片才有完整圆角 */
  .table-wrap { margin: 0; width: 100%; }
  .table-wrap.wrap-cards { overflow-x: visible; }

  /* 列表表格 → 卡片 */
  table.tbl.tbl-cards { display: block; font-size: 13px; }
  table.tbl.tbl-cards thead { display: none; }
  table.tbl.tbl-cards tbody { display: block; }
  table.tbl.tbl-cards tbody > tr {
    display: block; position: relative; margin-bottom: 11px; overflow: hidden;
    border: 1px solid var(--border); border-radius: var(--r-md); background: #fff;
  }
  table.tbl.tbl-cards tbody > tr:hover { background: #fff; }
  table.tbl.tbl-cards tbody > tr > td {
    display: flex; align-items: flex-start; gap: 10px;
    width: auto; max-width: none;
    padding: 9px 13px; border-bottom: 1px solid var(--ink-100);
    text-align: left; white-space: normal; line-height: 1.65;
  }
  table.tbl.tbl-cards tbody > tr > td:last-child { border-bottom: 0; }
  table.tbl.tbl-cards tbody > tr > td::before {
    content: attr(data-label);
    flex: 0 0 74px; max-width: 42%;
    color: var(--text-light); font-size: 12.5px; font-weight: 500;
  }
  /* 无表头的列（复选框等）→ 卡片顶部条 */
  table.tbl.tbl-cards tbody > tr > td[data-label=""] {
    background: var(--ink-50); border-bottom: 1px solid var(--border);
  }
  table.tbl.tbl-cards tbody > tr > td[data-label=""]::before { display: none; }
  /* 空单元格不占位，卡片更紧凑 */
  table.tbl.tbl-cards tbody > tr > td:empty { display: none; }
  /* 卡片内的行内按钮/按钮组换行排布 */
  table.tbl.tbl-cards tbody > tr > td .btn-group,
  table.tbl.tbl-cards tbody > tr > td .btn { flex-wrap: wrap; }
  table.tbl.tbl-cards tbody > tr > td .btn { margin: 0 6px 6px 0; }
  /* 卡片内不再把附属元素（复制按钮、徽章等）推到最右侧 */
  table.tbl.tbl-cards tbody > tr > td > .ml-auto { margin-left: 0 !important; }
  /* 卡片模式下长标题不再限宽，完整换行显示 */
  table.tbl.tbl-cards .paper-cell { max-width: none; }

  /* 卡片内嵌子表格（如成绩明细）允许横向滚动 */
  table.tbl.tbl-cards tbody > tr > td .table-wrap { overflow-x: auto; }

  /* 批量操作条：按钮换行占满，避免挤压 */
  #bulk-bar { flex-wrap: wrap; padding: 10px 13px !important; }
  #bulk-bar .btn-group { width: 100%; }
  #bulk-bar .btn-group .btn { flex: 1 1 auto; }

  /* 筛选区动作按钮：窄屏下纵向铺满，不再靠 margin-left:auto 挤到右边 */
  .form-grid .span-all > .btn { flex: 1 1 100%; margin-left: 0 !important; }
  .form-grid .span-all { display: flex; flex-wrap: wrap; gap: 8px; }

  /* 概览统计卡更紧凑 */
  .stat-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
  .stat-card { padding: 12px 13px; }
  .stat-icon { width: 32px; height: 32px; font-size: 15px; margin-bottom: 8px; }
  .stat-value { font-size: 20px; }

  /* 页面标题区动作按钮换行 */
  .page-head-actions { flex-wrap: wrap; }
  .page-head-actions .btn { flex: 1 1 45%; }

  /* 卡片头部的标题与统计换行 */
  .card-head { flex-wrap: wrap; gap: 8px; }
}

@media (max-width: 420px) {
  .stat-grid { grid-template-columns: 1fr; }
  .btn { padding: 8px 13px; font-size: 13px; }
}

/* ================================================================
   手机端「5 张统计卡」压缩为一行紧凑数据条
   （考生首页 / 历史成绩）：去掉图标与脚注，5 项并排，
   考试列表可以立刻进入视野，不用再滑很久
   ================================================================ */
@media (max-width: 768px) {
  .stat-grid.cols-5 {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 6px; margin-bottom: 12px;
  }
  .stat-grid.cols-5 .stat-card {
    padding: 8px 4px 9px; border-radius: var(--r-sm);
    text-align: center; transform: none !important; box-shadow: none;
  }
  .stat-grid.cols-5 .stat-card::after { display: none; }
  .stat-grid.cols-5 .stat-icon { display: none; }
  .stat-grid.cols-5 .stat-label {
    font-size: 10.5px; margin-bottom: 2px;
    white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  }
  .stat-grid.cols-5 .stat-value { font-size: 16px; letter-spacing: 0; }
  .stat-grid.cols-5 .stat-value small { font-size: 10px; margin-left: 1px; }
  .stat-grid.cols-5 .stat-foot { display: none; }
}
@media (max-width: 360px) {
  .stat-grid.cols-5 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .stat-grid.cols-5 .stat-card { text-align: left; padding: 8px 10px; }
}

@media print {
  .sidebar, .topbar, .page-head-actions, .pager, .no-print { display: none !important; }
  .main { margin-left: 0; }
  .card { box-shadow: none; border-color: #ccc; break-inside: avoid; }
  body { background: #fff; }
}

/* ============ 内联 SVG 图标基础样式 ============ */
.ico {
  display: inline-block;
  vertical-align: -0.16em;
  flex: 0 0 auto;
  pointer-events: none;
}
.ico-block { display: block; }
.btn .ico { vertical-align: -0.19em; }
/* 小尺寸按钮内的图标跟随字号（1em），避免 18px 图标把按钮撑高，导致同一行按钮顶边不齐 */
.btn-xs .ico, .btn-sm .ico { width: 1em; height: 1em; vertical-align: -0.14em; }
.stat-card .ico, .empty .ico { display: block; margin: 0 auto; }