/* 班级积分系统 - 简洁响应式样式（手机优先） */
:root {
  --color-bg: #F1EFE8;
  --color-surface: #FFFFFF;
  --color-surface-alt: #FAF8F2;
  --color-text: #1F1F1E;
  --color-text-muted: #5F5E5A;
  --color-text-dim: #888780;
  --color-border: #D3D1C7;
  --color-border-light: #E8E5DC;
  --color-primary: #534AB7;
  --color-primary-hover: #3C3489;
  --color-success: #1D9E75;
  --color-danger: #E24B4A;
  --color-warning: #BA7517;
  --color-info: #378ADD;
  --color-purple: #534AB7;
  --color-teal: #1D9E75;
  --color-amber: #BA7517;
  --color-coral: #D85A30;
  --color-blue: #378ADD;
  --radius: 8px;
  --radius-lg: 12px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
  --shadow-md: 0 2px 8px rgba(0,0,0,0.08);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
a { color: var(--color-primary); text-decoration: none; }
a:hover { color: var(--color-primary-hover); }
button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; }
h1, h2, h3, h4 { margin: 0 0 0.6em 0; font-weight: 500; }
h1 { font-size: 20px; }
h2 { font-size: 18px; }
h3 { font-size: 16px; }
h4 { font-size: 14px; }

/* ============= Topbar ============= */
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  background: var(--color-surface);
  padding: 12px 20px;
  border-bottom: 1px solid var(--color-border-light);
  position: sticky; top: 0; z-index: 100;
  box-shadow: var(--shadow-sm);
}
.topbar-brand {
  display: flex; align-items: center; gap: 8px;
  font-weight: 500; color: var(--color-text);
}
.topbar-brand .brand-icon { font-size: 22px; }
.topbar-brand .brand-text { font-size: 16px; }
.topbar-right { display: flex; align-items: center; gap: 14px; }
.topbar-link {
  color: var(--color-text-muted);
  font-size: 14px;
  padding: 4px 0;
  border-bottom: 2px solid transparent;
}
.topbar-link:hover { color: var(--color-primary); }
.topbar-link-admin {
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
  padding: 4px 10px;
  border-radius: var(--radius);
}
.topbar-link-admin:hover {
  background: var(--color-primary);
  color: white;
}
.topbar-link-quit { color: var(--color-danger); }
.topbar-user { font-size: 13px; color: var(--color-text-muted); }

/* ============= Main ============= */
.main { max-width: 1200px; margin: 0 auto; padding: 16px 20px 40px; }

/* ============= Footer ============= */
.footer {
  text-align: center;
  padding: 20px;
  color: var(--color-text-dim);
  font-size: 12px;
}

/* ============= Flash ============= */
.flash-wrap { padding: 12px 20px 0; max-width: 1200px; margin: 0 auto; }
.flash {
  padding: 10px 14px;
  border-radius: var(--radius);
  margin-bottom: 8px;
  font-size: 14px;
  animation: fadeIn 0.3s;
}
.flash-success { background: #E1F5EE; color: #0F6E56; border-left: 3px solid var(--color-success); }
.flash-danger  { background: #FCEBEB; color: #A32D2D; border-left: 3px solid var(--color-danger); }
.flash-info    { background: #E6F1FB; color: #185FA5; border-left: 3px solid var(--color-info); }
.flash-warning { background: #FAEEDA; color: #854F0B; border-left: 3px solid var(--color-warning); }
@keyframes fadeIn { from { opacity: 0; transform: translateY(-4px); } to { opacity: 1; transform: translateY(0); } }

/* ============= Cards ============= */
.card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 16px 20px;
  margin-bottom: 16px;
  box-shadow: var(--shadow-sm);
}
.card-title {
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: 12px;
  display: flex; align-items: center; justify-content: space-between;
  gap: 10px;
  flex-wrap: wrap;
}
.card-title .updated { font-size: 12px; color: var(--color-text-dim); font-weight: 400; }
.card-title .title-icon { font-size: 18px; margin-right: 6px; }

/* ============= Buttons ============= */
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 8px 16px;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  border-radius: var(--radius);
  font-size: 14px;
  transition: all 0.15s;
  text-decoration: none;
}
.btn:hover { background: var(--color-surface-alt); border-color: var(--color-text-dim); }
.btn-primary {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}
.btn-primary:hover { background: var(--color-primary-hover); color: white; }
.btn-danger {
  background: var(--color-danger);
  color: white;
  border-color: var(--color-danger);
}
.btn-danger:hover { background: #A32D2D; }
.btn-sm { padding: 4px 10px; font-size: 13px; }
.btn-block { width: 100%; justify-content: center; }

/* ============= Forms ============= */
.form-group { margin-bottom: 14px; }
.form-label {
  display: block;
  font-size: 13px;
  color: var(--color-text-muted);
  margin-bottom: 6px;
}
.form-control {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
  font-size: 14px;
  transition: border-color 0.15s;
}
.form-control:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(83,74,183,0.12);
}
select.form-control { background-image: linear-gradient(45deg, transparent 50%, var(--color-text-muted) 50%),
  linear-gradient(135deg, var(--color-text-muted) 50%, transparent 50%);
  background-position: calc(100% - 16px) center, calc(100% - 11px) center;
  background-size: 5px 5px, 5px 5px;
  background-repeat: no-repeat;
  appearance: none;
  padding-right: 30px;
}
.form-row { display: flex; gap: 12px; flex-wrap: wrap; }
.form-row > .form-group { flex: 1; min-width: 140px; }
.form-actions { margin-top: 16px; display: flex; gap: 8px; flex-wrap: wrap; }

/* ============= Tables ============= */
.table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}
.table th, .table td {
  padding: 10px 12px;
  text-align: left;
  border-bottom: 1px solid var(--color-border-light);
}
.table th {
  background: var(--color-surface-alt);
  font-weight: 500;
  color: var(--color-text-muted);
  font-size: 13px;
}
.table tbody tr:hover { background: var(--color-surface-alt); }
.table .num { text-align: right; font-variant-numeric: tabular-nums; }
.table .center { text-align: center; }

/* ============= Public Index (Leaderboard) ============= */
.board-header {
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: 12px;
  margin-bottom: 12px;
}
.board-tabs {
  display: flex; gap: 4px; flex-wrap: wrap;
  background: var(--color-surface-alt);
  padding: 4px;
  border-radius: var(--radius);
}
.board-tab {
  padding: 6px 14px;
  border-radius: 6px;
  font-size: 13px;
  color: var(--color-text-muted);
  cursor: pointer;
  transition: all 0.15s;
  background: transparent;
  border: none;
}
.board-tab:hover { color: var(--color-text); }
.board-tab.active {
  background: var(--color-primary);
  color: white;
}
.board-pane { display: none; }
.board-pane.active { display: block; }

.rank-list { list-style: none; margin: 0; padding: 0; }
.rank-item {
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 14px;
  background: var(--color-surface);
  border-radius: var(--radius);
  margin-bottom: 8px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.15s;
}
.rank-item:hover { transform: translateX(2px); }
.rank-item.top1 { background: linear-gradient(135deg, #FCEBEB, #FFFFFF); border-left: 4px solid #FFD700; }
.rank-item.top2 { background: linear-gradient(135deg, #F1EFE8, #FFFFFF); border-left: 4px solid #C0C0C0; }
.rank-item.top3 { background: linear-gradient(135deg, #FAEEDA, #FFFFFF); border-left: 4px solid #CD7F32; }
.rank-left { display: flex; align-items: center; gap: 12px; flex: 1; min-width: 0; }
.rank-pos {
  font-size: 18px;
  font-weight: 500;
  min-width: 36px;
  text-align: center;
  color: var(--color-text-dim);
  font-variant-numeric: tabular-nums;
}
.rank-item.top1 .rank-pos { color: #B8860B; }
.rank-item.top2 .rank-pos { color: #888880; }
.rank-item.top3 .rank-pos { color: #A0522D; }
.rank-name {
  font-size: 15px;
  color: var(--color-text);
  font-weight: 500;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.rank-name a { color: inherit; }
.rank-name a:hover { color: var(--color-primary); }
.rank-right { display: flex; align-items: center; gap: 10px; }
.rank-score {
  font-size: 18px;
  font-weight: 500;
  color: var(--color-text);
  font-variant-numeric: tabular-nums;
  min-width: 60px;
  text-align: right;
}
.rank-change {
  font-size: 12px;
  padding: 2px 8px;
  border-radius: 10px;
  font-weight: 500;
  min-width: 48px;
  text-align: center;
}
.rank-change.up   { background: #FCEBEB; color: #A32D2D; }
.rank-change.down { background: #E1F5EE; color: #0F6E56; }
.rank-change.same { background: #F1EFE8; color: #5F5E5A; }
.rank-change.new  { background: #E6F1FB; color: #185FA5; }
.rank-empty {
  text-align: center;
  padding: 30px;
  color: var(--color-text-dim);
  font-size: 14px;
}

/* ============= Admin ============= */
.admin-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 12px;
  margin-bottom: 16px;
}
.admin-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 16px;
  box-shadow: var(--shadow-sm);
  text-align: center;
  cursor: pointer;
  transition: all 0.15s;
  border: 1px solid var(--color-border-light);
  text-decoration: none;
  color: inherit;
}
.admin-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); border-color: var(--color-primary); }
.admin-card .ic { font-size: 28px; margin-bottom: 6px; }
.admin-card .lbl { font-size: 14px; font-weight: 500; }
.admin-card .desc { font-size: 12px; color: var(--color-text-dim); margin-top: 4px; }

.cat-tabs {
  display: flex; gap: 8px; flex-wrap: wrap;
  margin-bottom: 14px;
}
.cat-tab {
  padding: 8px 16px;
  border-radius: var(--radius);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  font-size: 14px;
  color: var(--color-text);
  text-decoration: none;
  transition: all 0.15s;
}
.cat-tab:hover { border-color: var(--color-text-dim); }
.cat-tab.active {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}

/* ============= Login ============= */
.login-wrap {
  max-width: 380px;
  margin: 60px auto;
  padding: 32px 28px;
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}
.login-title { text-align: center; font-size: 22px; margin-bottom: 24px; }
.login-hint { font-size: 12px; color: var(--color-text-dim); text-align: center; margin-top: 12px; }

/* ============= Stat ============= */
.stat-card {
  display: flex; align-items: center; gap: 12px;
  padding: 14px;
  background: var(--color-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}
.stat-icon { font-size: 26px; }
.stat-num { font-size: 22px; font-weight: 500; line-height: 1.2; }
.stat-lbl { font-size: 12px; color: var(--color-text-muted); }

/* ============= Mobile ============= */
@media (max-width: 720px) {
  .topbar { padding: 10px 14px; }
  .topbar-brand .brand-text { font-size: 15px; }
  .topbar-right { gap: 10px; }
  .topbar-link { font-size: 13px; }
  .main { padding: 12px 14px 30px; }
  .card { padding: 14px 14px; }
  .table th, .table td { padding: 8px 6px; font-size: 13px; }
  .rank-item { padding: 10px 12px; }
  .rank-name { font-size: 14px; }
  .rank-score { font-size: 16px; }
  .form-row { flex-direction: column; gap: 0; }
  .form-row > .form-group { min-width: 100%; }
  h1 { font-size: 18px; }
  h2 { font-size: 16px; }
}

/* ============= Utility ============= */
.text-muted { color: var(--color-text-muted); }
.text-dim { color: var(--color-text-dim); }
.text-success { color: var(--color-success); }
.text-danger { color: var(--color-danger); }
.text-warning { color: var(--color-warning); }
.text-center { text-align: center; }
.text-right { text-align: right; }
.mt-0 { margin-top: 0; }
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.d-flex { display: flex; }
.gap-1 { gap: 8px; }
.gap-2 { gap: 16px; }
.justify-between { justify-content: space-between; }
.items-center { align-items: center; }
.flex-1 { flex: 1; }
.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 10px;
  font-size: 12px;
  background: var(--color-surface-alt);
  color: var(--color-text-muted);
}
.badge-primary { background: #EEEDFE; color: var(--color-primary); }
.badge-success { background: #E1F5EE; color: var(--color-success); }
.badge-danger  { background: #FCEBEB; color: var(--color-danger); }
.badge-warning { background: #FAEEDA; color: var(--color-warning); }
.badge-info    { background: #E6F1FB; color: var(--color-info); }