/* ============================================
   自考备考助手 - 蓝白精致风格
   字体：Inter（CDN 引入）
   ============================================ */
:root {
  --primary: #2563eb;
  --primary-600: #1d4ed8;
  --primary-700: #1e40af;
  --primary-050: #eff6ff;
  --primary-100: #dbeafe;
  --primary-200: #bfdbfe;
  --success: #16a34a;
  --success-050: #f0fdf4;
  --warning: #d97706;
  --danger: #dc2626;
  --danger-050: #fef2f2;
  --muted: #6b7280;
  --text: #111827;
  --border: #e5e7eb;
  --bg: #f6f8fc;
  --card: #ffffff;
  --shadow-sm: 0 1px 2px rgba(16, 24, 40, 0.05);
  --shadow: 0 1px 3px rgba(16, 24, 40, 0.08), 0 1px 2px rgba(16, 24, 40, 0.04);
  --shadow-lg: 0 8px 24px rgba(37, 99, 235, 0.10);
  --radius: 10px;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-font-smoothing: antialiased; }
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  font-size: 15px;
}
.container { max-width: 1120px; margin: 0 auto; padding: 0 20px; }
a { color: var(--primary); }

/* ---- 导航 ---- */
.navbar {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,0.9);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.brand {
  display: flex; align-items: center; gap: 10px;
  color: var(--text); font-weight: 700; font-size: 17px; letter-spacing: -0.01em;
  text-decoration: none;
}
.brand-logo {
  width: 30px; height: 30px; border-radius: 8px;
  background: linear-gradient(135deg, var(--primary), var(--primary-700));
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-size: 15px;
  box-shadow: var(--shadow-sm);
}
.nav-links { display: flex; align-items: center; gap: 2px; }
.nav-links a {
  color: var(--muted); text-decoration: none; padding: 8px 14px; border-radius: 8px;
  font-size: 14px; font-weight: 500; transition: all .15s;
}
.nav-links a:hover { color: var(--primary); background: var(--primary-050); }
.nav-links a.active { color: var(--primary-700); background: var(--primary-100); font-weight: 600; }

/* ---- 布局 ---- */
.page { padding: 28px 0 64px; }
.page-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 24px; }
.page-title { font-size: 22px; font-weight: 700; letter-spacing: -0.02em; }
.page-sub { color: var(--muted); font-size: 14px; margin-top: 2px; }
.card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 22px; margin-bottom: 20px; box-shadow: var(--shadow);
  animation: rise .5s cubic-bezier(.22,.61,.36,1) both;
}
.card-title { font-size: 15px; font-weight: 600; margin-bottom: 16px; color: var(--text); display: flex; align-items: center; gap: 8px; }
.card-title i { color: var(--primary); font-size: 17px; }

/* ---- 网格 ---- */
.grid { display: grid; gap: 16px; }
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.grid-4 { grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); }

/* ---- 统计卡 ---- */
.stat-card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 20px 22px; box-shadow: var(--shadow-sm); position: relative; overflow: hidden;
  transition: transform .25s cubic-bezier(.22,.61,.36,1), box-shadow .25s, border-color .25s;
  animation: rise .5s cubic-bezier(.22,.61,.36,1) both;
}
.stat-card:nth-child(2) { animation-delay: .06s; }
.stat-card:nth-child(3) { animation-delay: .12s; }
.stat-card:nth-child(4) { animation-delay: .18s; }
.stat-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-200);
}
.stat-card::before {
  content: ''; position: absolute; left: 0; top: 0; bottom: 0; width: 3px;
  background: linear-gradient(180deg, var(--primary), var(--primary-200));
}
.stat-card .num { font-size: 30px; font-weight: 800; color: var(--primary-700); letter-spacing: -0.02em; }
.stat-card .lbl { color: var(--muted); font-size: 13px; margin-top: 4px; font-weight: 500; }
.stat-card.green::before { background: linear-gradient(180deg, var(--success), #86efac); }
.stat-card.green .num { color: var(--success); }
.stat-card.orange::before { background: linear-gradient(180deg, var(--warning), #fcd34d); }
.stat-card.orange .num { color: var(--warning); }
.stat-card.red::before { background: linear-gradient(180deg, var(--danger), #fca5a5); }
.stat-card.red .num { color: var(--danger); }

/* ---- 表格 ---- */
.table-wrap { overflow-x: auto; border-radius: 8px; }
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 12px 14px; border-bottom: 1px solid var(--border); font-size: 14px; }
th { background: #f9fafb; color: var(--muted); font-weight: 600; white-space: nowrap; font-size: 13px; }
th:first-child, td:first-child { padding-left: 16px; }
th:last-child, td:last-child { padding-right: 16px; }
tbody tr:last-child td { border-bottom: none; }
tbody tr { transition: background .15s; }
tbody tr:hover td { background: var(--primary-050); }

/* ---- 徽章 ---- */
.badge {
  display: inline-block; padding: 3px 11px; border-radius: 999px;
  font-size: 12px; font-weight: 600; white-space: nowrap;
}
.badge-info    { background: var(--primary-100); color: var(--primary-700); }
.badge-primary { background: var(--primary-100); color: var(--primary-700); }
.badge-warning { background: #fef3c7; color: #b45309; }
.badge-success { background: #dcfce7; color: #166534; }
.badge-muted   { background: #f3f4f6; color: #4b5563; }
.badge-danger  { background: var(--danger-050); color: #991b1b; }

.text-success { color: var(--success); }
.text-warning { color: var(--warning); }
.text-danger  { color: var(--danger); }
.text-muted   { color: var(--muted); }

/* ---- 表单 ---- */
.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 6px; color: #374151; }
input[type="text"], input[type="date"], input[type="number"], select, textarea {
  width: 100%; padding: 9px 12px; border: 1px solid var(--border); border-radius: 8px;
  font-size: 14px; background: #fff; font-family: inherit; color: var(--text);
  transition: border-color .15s, box-shadow .15s;
}
input:focus, select:focus, textarea:focus {
  outline: none; border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}
.form-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 14px; }

/* ---- 按钮 ---- */
.btn {
  display: inline-block; padding: 9px 18px; border-radius: 8px; border: 1px solid transparent;
  font-size: 14px; font-weight: 600; cursor: pointer; text-decoration: none; font-family: inherit;
  background: var(--primary); color: #fff; transition: all .2s cubic-bezier(.22,.61,.36,1);
  box-shadow: var(--shadow-sm); position: relative; overflow: hidden;
}
.btn::after {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(120deg, transparent 30%, rgba(255,255,255,.25) 50%, transparent 70%);
  transform: translateX(-100%); transition: transform .5s ease;
}
.btn:hover { background: var(--primary-600); box-shadow: var(--shadow); transform: translateY(-2px); }
.btn:hover::after { transform: translateX(100%); }
.btn:active { transform: translateY(0); box-shadow: var(--shadow-sm); }
.btn-sm { padding: 5px 12px; font-size: 13px; }
.btn-outline { background: #fff; color: var(--primary); border-color: var(--primary-200); box-shadow: none; }
.btn-outline::after { display: none; }
.btn-outline:hover { background: var(--primary-050); color: var(--primary-700); transform: translateY(-1px); }
.btn-danger-outline { background: #fff; color: var(--danger); border-color: #fecaca; box-shadow: none; }
.btn-danger-outline::after { display: none; }
.btn-danger-outline:hover { background: var(--danger-050); transform: translateY(-1px); }
.btn-ghost { background: #f3f4f6; color: #374151; box-shadow: none; }
.btn-ghost::after { display: none; }
.btn-ghost:hover { background: #e5e7eb; color: var(--text); transform: translateY(-1px); }
.btn-success { background: var(--success); }
.btn-success:hover { background: #15803d; }
.btn-warning { background: var(--warning); }

/* ---- 内嵌表单 ---- */
.inline-form { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.inline-form input, .inline-form select { width: auto; }
.inline-form .grow { flex: 1; min-width: 120px; }

/* ---- 闪存消息 ---- */
.alert { padding: 12px 16px; border-radius: 8px; margin-bottom: 20px; font-size: 14px; font-weight: 500; }
.alert-success { background: var(--success-050); color: #166534; border: 1px solid #bbf7d0; }
.alert-danger  { background: var(--danger-050); color: #991b1b; border: 1px solid #fecaca; }
.alert-info    { background: var(--primary-050); color: var(--primary-700); border: 1px solid var(--primary-200); }

/* ---- 空状态 ---- */
.empty { text-align: center; padding: 44px 20px; color: var(--muted); }
.empty .big { font-size: 46px; margin-bottom: 10px; color: var(--primary-200); line-height: 1; }
.empty .big i { display: block; animation: float 3s ease-in-out infinite; }
.empty .btn { margin-top: 12px; }

/* ---- 进度条 ---- */
.progress { background: #e5e7eb; border-radius: 999px; height: 8px; overflow: hidden; }
.progress-bar { height: 100%; background: var(--primary); border-radius: 999px; transition: width .4s; }

/* ---- 页脚 ---- */
.footer { text-align: center; color: var(--muted); font-size: 13px; padding: 28px 0 32px; }

/* ---- 倒计时大字 ---- */
.countdown-big { font-size: 40px; font-weight: 800; letter-spacing: -0.03em; }

/* ---- 卡片标题带图标 ---- */
.card-title-icon { display: inline-flex; align-items: center; gap: 8px; }

/* ---- 整宽按钮 ---- */
.btn-block { display: block; width: 100%; text-align: center; }

/* ---- 导航用户徽标 ---- */
.nav-user {
  display: inline-flex; align-items: center; gap: 4px; margin-left: 12px; padding: 4px 12px;
  background: var(--primary-100); color: var(--primary-700);
  border-radius: 999px; font-size: 13px; font-weight: 600;
}
.nav-logout {
  display: inline-flex; align-items: center; gap: 4px;
  color: var(--muted) !important; margin-left: 4px;
}
.nav-logout:hover { color: var(--danger) !important; background: var(--danger-050) !important; }

/* ---- 登录/注册页 ---- */
.auth-wrap {
  min-height: calc(100vh - 140px);
  display: flex; align-items: center; justify-content: center;
  padding: 40px 16px;
}
.auth-card {
  width: 100%; max-width: 400px;
  background: var(--card); border: 1px solid var(--border); border-radius: 14px;
  padding: 36px 32px; box-shadow: var(--shadow-lg);
  animation: rise .5s cubic-bezier(.22,.61,.36,1) both;
}
.auth-logo { display: flex; justify-content: center; margin-bottom: 16px; }
.auth-logo .brand-logo i { font-size: 24px; line-height: 1; }
.auth-title { text-align: center; font-size: 22px; font-weight: 700; letter-spacing: -0.02em; }
.auth-sub { text-align: center; color: var(--muted); font-size: 14px; margin: 6px 0 24px; }
.auth-switch { text-align: center; color: var(--muted); font-size: 14px; margin-top: 18px; }

/* ============================================
   自定义 UI 组件（替换原生控件）
   ============================================ */

/* ---- 隐藏的原生 select（保留用于表单提交） ---- */
select.ui-native-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  opacity: 0; border: 0; padding: 0; margin: 0;
  clip: rect(0 0 0 0); white-space: nowrap; overflow: hidden;
}

/* ---- 自定义下拉框 ---- */
.ui-select { position: relative; display: inline-block; width: 100%; }
.ui-select-btn {
  width: 100%; display: flex; align-items: center; justify-content: space-between;
  padding: 9px 12px; border: 1px solid var(--border); border-radius: 8px;
  background: #fff; color: var(--text); font-size: 14px; font-family: inherit;
  cursor: pointer; text-align: left; transition: border-color .15s, box-shadow .15s;
}
.ui-select.open .ui-select-btn {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}
.ui-select-value { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.ui-select-arrow {
  flex-shrink: 0; margin-left: 8px; width: 0; height: 0;
  border-left: 5px solid transparent; border-right: 5px solid transparent;
  border-top: 6px solid var(--muted); transition: transform .15s;
}
.ui-select.open .ui-select-arrow { transform: rotate(180deg); }
.ui-select-menu {
  position: absolute; z-index: 300; top: calc(100% + 4px); left: 0; right: 0;
  background: #fff; border: 1px solid var(--border); border-radius: 8px;
  box-shadow: var(--shadow-lg); max-height: 220px; overflow-y: auto;
  display: none; padding: 4px;
  transform-origin: top;
}
.ui-select.open .ui-select-menu { display: block; animation: drop .18s cubic-bezier(.22,.61,.36,1); }
.ui-select-opt {
  padding: 8px 10px; border-radius: 6px; font-size: 14px; cursor: pointer;
  color: var(--text); transition: background .1s;
}
.ui-select-opt:hover { background: var(--primary-050); }
.ui-select-opt.selected { background: var(--primary-100); color: var(--primary-700); font-weight: 600; }

/* ---- 自定义日期选择器 ---- */
.ui-date { position: relative; width: 100%; }
.ui-date-field {
  width: 100%; padding: 9px 36px 9px 12px; border: 1px solid var(--border); border-radius: 8px;
  font-size: 14px; background: #fff; color: var(--text); font-family: inherit; cursor: pointer;
  transition: border-color .15s, box-shadow .15s;
}
.ui-date-field:focus {
  outline: none; border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}
.ui-date-icon {
  position: absolute; right: 12px; top: 50%; transform: translateY(-50%);
  width: 16px; height: 16px; pointer-events: none; opacity: .7;
  background: currentColor;
  -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2'%3E%3Crect x='3' y='4' width='18' height='18' rx='2'/%3E%3Cline x1='16' y1='2' x2='16' y2='6'/%3E%3Cline x1='8' y1='2' x2='8' y2='6'/%3E%3Cline x1='3' y1='10' x2='21' y2='10'/%3E%3C/svg%3E") center/contain no-repeat;
  mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2'%3E%3Crect x='3' y='4' width='18' height='18' rx='2'/%3E%3Cline x1='16' y1='2' x2='16' y2='6'/%3E%3Cline x1='8' y1='2' x2='8' y2='6'/%3E%3Cline x1='3' y1='10' x2='21' y2='10'/%3E%3C/svg%3E") center/contain no-repeat;
}
.ui-calendar {
  position: absolute; z-index: 400; top: calc(100% + 4px); left: 0;
  width: 260px; background: #fff; border: 1px solid var(--border); border-radius: 10px;
  box-shadow: var(--shadow-lg); padding: 12px; display: none;
  transform-origin: top left;
}
.ui-calendar.open { display: block; animation: pop .18s cubic-bezier(.22,.61,.36,1); }
.ui-cal-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 10px; }
.ui-cal-title { font-size: 14px; font-weight: 600; }
.ui-cal-nav {
  width: 28px; height: 28px; border: 1px solid var(--border); border-radius: 6px;
  background: #fff; color: var(--text); font-size: 16px; line-height: 1;
  cursor: pointer; display: flex; align-items: center; justify-content: center;
  transition: background .1s;
}
.ui-cal-nav:hover { background: var(--primary-050); color: var(--primary-700); }
.ui-cal-week { display: grid; grid-template-columns: repeat(7, 1fr); margin-bottom: 4px; }
.ui-cal-wk { text-align: center; font-size: 12px; color: var(--muted); padding: 4px 0; }
.ui-cal-grid { display: grid; grid-template-columns: repeat(7, 1fr); gap: 2px; }
.ui-cal-day {
  text-align: center; font-size: 13px; padding: 6px 0; border-radius: 6px;
  cursor: pointer; color: var(--text); transition: background .1s;
}
.ui-cal-day:hover { background: var(--primary-050); }
.ui-cal-day.muted { color: #cbd5e1; }
.ui-cal-day.today { color: var(--primary); font-weight: 700; }
.ui-cal-day.selected { background: var(--primary); color: #fff; font-weight: 600; }

/* ---- 隐藏 number 输入的原生上下箭头 ---- */
input[type="number"]::-webkit-outer-spin-button,
input[type="number"]::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
input[type="number"] { -moz-appearance: textfield; appearance: textfield; }

/* ============================================
   动画
   ============================================ */
/* 入场：淡入上浮 */
@keyframes rise {
  from { opacity: 0; transform: translateY(14px); }
  to   { opacity: 1; transform: translateY(0); }
}
/* 下拉菜单：展开 */
@keyframes drop {
  from { opacity: 0; transform: scaleY(.6); }
  to   { opacity: 1; transform: scaleY(1); }
}
/* 日历：缩放弹出 */
@keyframes pop {
  from { opacity: 0; transform: scale(.9); }
  to   { opacity: 1; transform: scale(1); }
}
/* 空状态图标：悬浮 */
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-8px); }
}
/* 尊重系统减弱动画偏好 */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
}

/* ---- 导航图标徽标 ---- */
.brand-logo i { font-size: 17px; line-height: 1; }
.nav-logout i, .nav-user i { margin-right: 2px; }