/* 班费管理系统主样式 — 继承 index.html 风格 */
/* =========================================================
   变量 & Reset
   ========================================================= */
:root {
  --primary:   #667eea;
  --primary2:  #764ba2;
  --income:    #e74c3c;
  --expense:   #ff8c00;
  --balance:   #fff;
  --success:   #27ae60;
  --danger:    #e74c3c;
  --warning:   #f39c12;
  --info:      #2980b9;
  --bg:        #f5f6fa;
  --white:     #ffffff;
  --border:    #e0e0e0;
  --text:      #333333;
  --text-sub:  #888888;
  --radius:    12px;
  --shadow:    0 2px 12px rgba(0,0,0,0.07);
}
* { margin:0; padding:0; box-sizing:border-box; -webkit-tap-highlight-color:transparent; }
html { scroll-behavior:smooth; -webkit-text-size-adjust:100%; }
body {
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  background:var(--bg); color:var(--text); line-height:1.6;
  padding-bottom:60px; -webkit-font-smoothing:antialiased;
}
a { color:var(--primary); text-decoration:none; }
a:hover { text-decoration:underline; }
img { max-width:100%; border-radius:6px; }

/* =========================================================
   顶部导航
   ========================================================= */
.topnav {
  background:linear-gradient(135deg, var(--primary) 0%, var(--primary2) 100%);
  color:#fff; position:sticky; top:0; z-index:100;
  box-shadow:0 2px 8px rgba(102,126,234,0.3);
}
.topnav-inner {
  max-width:900px; margin:0 auto; padding:0 16px;
  display:flex; align-items:center; height:54px; gap:6px;
}
.topnav-brand {
  font-size:17px; font-weight:700; color:#fff; flex:1;
  white-space:nowrap; overflow:hidden; text-overflow:ellipsis;
}
.topnav-brand:hover { text-decoration:none; opacity:0.9; }
.topnav-links { display:flex; align-items:center; gap:4px; }
.topnav-links a {
  color:rgba(255,255,255,0.9); font-size:13px; padding:6px 10px;
  border-radius:6px; transition:background .2s; white-space:nowrap;
}
.topnav-links a:hover { background:rgba(255,255,255,0.15); text-decoration:none; }
.btn-logout {
  background:rgba(255,255,255,0.15) !important;
  border:1px solid rgba(255,255,255,0.3) !important;
}
.topnav-toggle {
  display:none; background:none; border:none; color:#fff;
  font-size:22px; cursor:pointer; padding:6px;
}
.mobile-menu {
  display:none; flex-direction:column; background:rgba(70,40,110,0.98);
  padding:8px 0; border-top:1px solid rgba(255,255,255,0.15);
}
.mobile-menu a {
  color:rgba(255,255,255,0.9); padding:12px 20px; font-size:14px;
  border-bottom:1px solid rgba(255,255,255,0.08);
}
.mobile-menu a:hover { background:rgba(255,255,255,0.1); text-decoration:none; }
.mobile-menu.open { display:flex; }

/* =========================================================
   容器
   ========================================================= */
.container { max-width:900px; margin:0 auto; padding:20px 16px; }

/* =========================================================
   页头卡片（同 index.html 渐变风格）
   ========================================================= */
.page-header {
  background:linear-gradient(135deg, var(--primary) 0%, var(--primary2) 100%);
  color:#fff; padding:28px 24px; border-radius:16px;
  margin-bottom:22px; box-shadow:0 4px 15px rgba(102,126,234,0.3);
}
.page-header h1 { font-size:22px; margin-bottom:4px; font-weight:600; }
.page-header .sub { font-size:13px; opacity:0.9; }
.summary-cards {
  display:grid; grid-template-columns:repeat(3,1fr); gap:12px; margin-top:20px;
}
.summary-card {
  background:rgba(255,255,255,0.15); backdrop-filter:blur(10px);
  border-radius:12px; padding:14px 8px; text-align:center;
}
.summary-card .label { font-size:12px; opacity:0.85; margin-bottom:4px; }
.summary-card .value { font-size:20px; font-weight:700; }
.summary-card.income .value  { color:#ff6b6b; }
.summary-card.expense .value { color:#ffd93d; }
.summary-card.balance .value { color:#fff; }

/* =========================================================
   卡片通用
   ========================================================= */
.card {
  background:#fff; border-radius:var(--radius); box-shadow:var(--shadow);
  margin-bottom:20px; overflow:hidden;
}
.card-header {
  padding:16px 20px; border-bottom:1px solid #eef0f3;
  display:flex; justify-content:space-between; align-items:center;
  background:linear-gradient(90deg,#f8f9fa,#e9ecef);
}
.card-header h2 { font-size:16px; color:#495057; font-weight:600; }
.card-body { padding:20px; }

/* =========================================================
   学期区块（复刻 index.html）
   ========================================================= */
.semester { background:#fff; border-radius:16px; margin-bottom:20px; overflow:hidden; box-shadow:var(--shadow); }
.semester-header {
  background:linear-gradient(90deg,#f8f9fa,#e9ecef);
  padding:16px 20px; border-bottom:1px solid #e9ecef;
  display:flex; justify-content:space-between; align-items:center;
}
.semester-header h2 { font-size:17px; color:#495057; font-weight:600; }
.semester-header .semester-balance { font-size:15px; color:var(--primary); font-weight:600; }
.opening-balance {
  padding:12px 20px; background:#fffbeb; border-bottom:1px dashed #f0e68c;
  font-size:14px; color:#856404;
}
.tx-list { padding:0; }
.tx-item {
  display:grid; grid-template-columns:80px 1fr 70px 70px 80px;
  gap:8px; padding:12px 16px; border-bottom:1px solid #f0f0f0;
  align-items:start; font-size:13px; transition:background .15s;
}
.tx-item:last-child { border-bottom:none; }
.tx-item:hover { background:#f8f9fa; }
.tx-item.non-class-fee { background:#f0f7ff; }
.tx-item.non-class-fee:hover { background:#e3f0ff; }
.tx-date { color:#888; font-size:12px; white-space:nowrap; padding-top:2px; }
.tx-project { font-weight:500; color:#333; line-height:1.4; word-break:break-word; }
.tx-project .tx-person { font-size:11px; color:#999; font-weight:normal; margin-top:3px; }
.tx-income  { color:#e74c3c; font-weight:600; text-align:right; white-space:nowrap; padding-top:2px; }
.tx-expense { color:#ff8c00; font-weight:600; text-align:right; white-space:nowrap; padding-top:2px; }
.tx-balance { text-align:right; color:#555; font-weight:500; white-space:nowrap; padding-top:2px; }
.tx-remark  { grid-column:1/-1; font-size:11px; color:#888; margin-top:2px; padding-left:88px; }
.semester-footer {
  background:#f8f9fa; padding:14px 20px; border-top:1px solid #e9ecef;
  display:flex; justify-content:space-between; align-items:center;
  font-size:14px; font-weight:600; flex-wrap:wrap; gap:8px;
}
.semester-footer .label { color:#666; }
.semester-footer .value.income  { color:#e74c3c; }
.semester-footer .value.expense { color:#ff8c00; }

/* =========================================================
   截图按钮（复刻）
   ========================================================= */
.screenshot-btn {
  display:inline-flex; align-items:center; gap:4px;
  padding:5px 12px; background:#e3f2fd; color:#1976d2;
  border-radius:12px; font-size:11px; cursor:pointer;
  border:none; margin-top:5px; transition:background .2s;
  min-height:28px;
}
.screenshot-btn:hover { background:#bbdefb; }
.screenshot-btn:active { transform:scale(0.96); }

/* =========================================================
   徽标
   ========================================================= */
.badge {
  display:inline-block; padding:2px 6px; border-radius:4px;
  font-size:10px; margin-left:6px;
}
.badge-nonfee { background:#e3f2fd; color:#1976d2; }
.badge-success { background:#e8f5e9; color:#2e7d32; }
.badge-danger  { background:#ffebee; color:#c62828; }
.badge-warn    { background:#fff8e1; color:#f57f17; }
.badge-archived{ background:#f3e5f5; color:#6a1b9a; }

/* =========================================================
   筛选栏
   ========================================================= */
.filter-bar {
  background:#fff; border-radius:12px; padding:14px 16px;
  margin-bottom:16px; box-shadow:var(--shadow);
  display:flex; align-items:center; gap:10px; flex-wrap:wrap;
}
.filter-bar label { font-size:14px; color:#666; font-weight:500; }
.filter-btn {
  padding:7px 16px; border-radius:20px; border:1px solid #e0e0e0;
  background:#f8f9fa; font-size:13px; cursor:pointer; transition:all .2s;
  min-height:36px;
}
.filter-btn:hover, .filter-btn.active { background:var(--primary); color:#fff; border-color:var(--primary); }
.filter-btn:active { transform:scale(0.95); }

/* =========================================================
   表单
   ========================================================= */
.form-group { margin-bottom:18px; }
.form-group label { display:block; font-size:13px; color:#555; margin-bottom:6px; font-weight:500; }
.form-control {
  width:100%; padding:10px 14px; border:1px solid var(--border);
  border-radius:8px; font-size:14px; outline:none; transition:border .2s;
  background:#fff; color:var(--text);
}
.form-control:focus { border-color:var(--primary); box-shadow:0 0 0 3px rgba(102,126,234,0.12); }
.form-control[readonly] { background:#f8f9fa; cursor:default; }
textarea.form-control { resize:vertical; min-height:80px; }
select.form-control { appearance:none; background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%23667eea' d='M1 1l5 5 5-5'/%3E%3C/svg%3E"); background-repeat:no-repeat; background-position:right 12px center; padding-right:32px; }
.form-row { display:grid; grid-template-columns:1fr 1fr; gap:14px; }
.form-row-3 { display:grid; grid-template-columns:1fr 1fr 1fr; gap:14px; }
.form-hint { font-size:12px; color:#aaa; margin-top:4px; }

/* =========================================================
   按钮
   ========================================================= */
.btn {
  display:inline-flex; align-items:center; justify-content:center; gap:6px;
  padding:10px 20px; border-radius:8px; border:none; font-size:14px;
  font-weight:600; cursor:pointer; transition:all .2s; min-height:40px;
  text-decoration:none;
}
.btn:hover { opacity:0.88; text-decoration:none; }
.btn:active { transform:scale(0.97); }
.btn-primary { background:linear-gradient(135deg,var(--primary),var(--primary2)); color:#fff; }
.btn-success { background:var(--success); color:#fff; }
.btn-danger  { background:var(--danger); color:#fff; }
.btn-warning { background:var(--warning); color:#fff; }
.btn-light   { background:#f0f2f5; color:#555; border:1px solid #ddd; }
.btn-sm      { padding:6px 14px; font-size:12px; min-height:32px; }
.btn-block   { width:100%; }

/* =========================================================
   提示框
   ========================================================= */
.alert {
  padding:12px 16px; border-radius:8px; margin-bottom:16px; font-size:14px;
}
.alert-success { background:#e8f5e9; color:#2e7d32; border:1px solid #c8e6c9; }
.alert-error, .alert-danger { background:#ffebee; color:#c62828; border:1px solid #ffcdd2; }
.alert-info    { background:#e3f2fd; color:#1565c0; border:1px solid #bbdefb; }
.alert-warning { background:#fff8e1; color:#e65100; border:1px solid #ffecb3; }

/* =========================================================
   灯箱（复刻）
   ========================================================= */
.lightbox {
  display:none; position:fixed; top:0; left:0; right:0; bottom:0;
  background:rgba(0,0,0,0.95); z-index:9999;
  justify-content:center; align-items:center; flex-direction:column;
}
.lightbox.active { display:flex; }
.lightbox-img { max-width:94vw; max-height:78vh; object-fit:contain; border-radius:8px; user-select:none; }
.lightbox-counter { color:#fff; font-size:14px; margin-top:12px; opacity:0.8; }
.lightbox-close {
  position:absolute; top:16px; right:16px; color:#fff; font-size:32px;
  cursor:pointer; opacity:0.8; width:44px; height:44px;
  display:flex; align-items:center; justify-content:center;
  border-radius:50%; background:rgba(255,255,255,0.1); border:none;
}
.lightbox-close:hover { opacity:1; background:rgba(255,255,255,0.2); }
.lightbox-nav {
  position:absolute; top:50%; transform:translateY(-50%);
  color:#fff; font-size:40px; cursor:pointer; padding:20px; opacity:0.6;
  user-select:none; min-width:60px; min-height:60px;
  display:flex; align-items:center; justify-content:center; border:none; background:none;
}
.lightbox-nav:hover { opacity:1; }
.lightbox-prev { left:4px; }
.lightbox-next { right:4px; }
.lightbox-caption { color:#fff; font-size:13px; margin-top:8px; opacity:0.7; text-align:center; max-width:90vw; }

/* =========================================================
   上传区域
   ========================================================= */
.upload-area {
  border:2px dashed var(--border); border-radius:10px;
  padding:30px; text-align:center; cursor:pointer; transition:all .2s;
  color:#aaa; font-size:13px;
}
.upload-area:hover, .upload-area.dragover { border-color:var(--primary); color:var(--primary); background:#f0f3ff; }
.upload-previews { display:flex; flex-wrap:wrap; gap:10px; margin-top:12px; }
.upload-preview-item {
  position:relative; width:80px; height:80px; border-radius:8px; overflow:hidden;
  border:2px solid #eee;
}
.upload-preview-item img { width:100%; height:100%; object-fit:cover; }
.upload-preview-item .del-btn {
  position:absolute; top:2px; right:2px; background:rgba(0,0,0,0.6);
  color:#fff; border:none; border-radius:50%; width:20px; height:20px;
  font-size:12px; cursor:pointer; display:flex; align-items:center; justify-content:center;
}

/* =========================================================
   班级列表卡片
   ========================================================= */
.class-grid { display:grid; grid-template-columns:repeat(auto-fill,minmax(260px,1fr)); gap:16px; }
.class-card {
  background:#fff; border-radius:14px; box-shadow:var(--shadow);
  padding:20px; position:relative; transition:box-shadow .2s;
  border:2px solid transparent;
}
.class-card:hover { box-shadow:0 4px 20px rgba(102,126,234,0.18); border-color:var(--primary); }
.class-card h3 { font-size:16px; color:#333; margin-bottom:6px; }
.class-card .meta { font-size:12px; color:#aaa; margin-bottom:14px; }
.class-card .balance-big { font-size:24px; font-weight:700; color:var(--primary); margin-bottom:12px; }
.class-card .archived-overlay {
  position:absolute; top:0; left:0; right:0; bottom:0;
  background:rgba(255,255,255,0.65); backdrop-filter:blur(2px);
  display:flex; align-items:center; justify-content:center;
  border-radius:14px; font-size:18px; color:#6a1b9a; font-weight:700;
}

/* =========================================================
   表格
   ========================================================= */
.table-wrap { overflow-x:auto; }
table.data-table { width:100%; border-collapse:collapse; font-size:13px; }
.data-table th { background:#f8f9fa; padding:10px 12px; text-align:left; color:#555; font-weight:600; border-bottom:2px solid #eee; white-space:nowrap; }
.data-table td { padding:10px 12px; border-bottom:1px solid #f0f0f0; vertical-align:middle; }
.data-table tr:hover td { background:#f8f9fa; }
.data-table tr:last-child td { border-bottom:none; }

/* =========================================================
   分页
   ========================================================= */
.pagination { display:flex; justify-content:center; gap:6px; flex-wrap:wrap; margin-top:20px; }
.pagination a, .pagination span {
  padding:7px 13px; border-radius:7px; font-size:13px; border:1px solid #ddd;
  background:#fff; color:var(--text); transition:all .2s; text-decoration:none;
}
.pagination a:hover { background:var(--primary); color:#fff; border-color:var(--primary); }
.pagination .current { background:var(--primary); color:#fff; border-color:var(--primary); font-weight:700; }
.pagination .disabled { color:#ccc; cursor:default; }

/* =========================================================
   个人中心
   ========================================================= */
.profile-avatar {
  width:80px; height:80px; border-radius:50%;
  background:linear-gradient(135deg,var(--primary),var(--primary2));
  display:flex; align-items:center; justify-content:center;
  font-size:32px; color:#fff; margin:0 auto 16px; font-weight:700;
}

/* =========================================================
   站点底部
   ========================================================= */
.site-footer {
  text-align:center; color:#aaa; font-size:12px;
  padding:20px; margin-top:20px;
}

/* =========================================================
   加载状态
   ========================================================= */
.spinner {
  width:24px; height:24px; border:3px solid #eee;
  border-top-color:var(--primary); border-radius:50%;
  animation:spin .7s linear infinite; display:inline-block;
}
@keyframes spin { to { transform:rotate(360deg); } }
.loading-overlay {
  position:fixed; top:0; left:0; right:0; bottom:0;
  background:rgba(255,255,255,0.8); z-index:9998;
  display:none; align-items:center; justify-content:center;
}
.loading-overlay.active { display:flex; }

/* =========================================================
   空状态
   ========================================================= */
.empty-state { text-align:center; padding:48px 20px; color:#bbb; }
.empty-state .icon { font-size:48px; margin-bottom:12px; }
.empty-state p { font-size:14px; }

/* =========================================================
   响应式
   ========================================================= */
@media (max-width:768px) {
  .container { padding:12px; }
  .page-header { padding:20px 16px; border-radius:14px; }
  .page-header h1 { font-size:19px; }
  .summary-cards { gap:8px; }
  .summary-card { padding:12px 4px; }
  .summary-card .value { font-size:16px; }
  .form-row, .form-row-3 { grid-template-columns:1fr; }
  .topnav-links { display:none; }
  .topnav-toggle { display:block; }
  .class-grid { grid-template-columns:1fr 1fr; }
}
@media (max-width:480px) {
  .container { padding:8px; }
  .tx-item { grid-template-columns:65px 1fr 55px 55px 65px; gap:4px; padding:10px 10px; font-size:11.5px; }
  .tx-date { font-size:10.5px; }
  .tx-income,.tx-expense,.tx-balance { font-size:11.5px; }
  .semester-header { flex-direction:column; align-items:flex-start; gap:4px; }
  .class-grid { grid-template-columns:1fr; }
  .summary-card .value { font-size:15px; }
  .page-header h1 { font-size:17px; }
}
@media (max-width:360px) {
  .tx-item { grid-template-columns:58px 1fr 50px 50px 58px; gap:3px; padding:8px; font-size:11px; }
  .summary-card .value { font-size:14px; }
}