/* 基础重置 */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --primary: #4f6ef7;
  --primary-hover: #3b5de7;
  --danger: #e74c3c;
  --danger-hover: #c0392b;
  --bg: #f5f6fa;
  --card: #fff;
  --text: #2c3e50;
  --text-secondary: #7f8c8d;
  --border: #e0e4ea;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,0.08);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

/* 登录遮罩 */
#login-overlay {
  position: fixed; inset: 0;
  background: var(--bg);
  display: flex; align-items: center; justify-content: center;
  z-index: 1000;
}
.login-card {
  background: var(--card);
  padding: 40px 36px;
  border-radius: 12px;
  box-shadow: 0 4px 24px rgba(0,0,0,0.1);
  text-align: center;
  width: 360px; max-width: 90vw;
}
.login-card h1 { font-size: 22px; margin-bottom: 4px; }
.login-desc { color: var(--text-secondary); margin-bottom: 20px; font-size: 14px; }
.login-card input {
  width: 100%; padding: 10px 14px;
  border: 1px solid var(--border); border-radius: var(--radius);
  font-size: 15px; outline: none; transition: border .2s;
}
.login-card input:focus { border-color: var(--primary); }
.login-card button {
  width: 100%; margin-top: 12px; padding: 10px;
  font-size: 15px; cursor: pointer;
}
.error-msg { color: var(--danger); font-size: 13px; margin-top: 8px; min-height: 20px; }

/* 主应用 */
#app { max-width: 960px; margin: 0 auto; padding: 24px 20px 60px; }
#app.hidden, #login-overlay.hidden { display: none; }

/* 头部 */
header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 20px;
}
header h1 { font-size: 24px; }
.header-actions { display: flex; gap: 8px; }

/* 按钮 */
.btn-primary {
  background: var(--primary); color: #fff;
  border: none; border-radius: var(--radius);
  padding: 8px 20px; font-size: 14px; cursor: pointer;
  transition: background .2s;
}
.btn-primary:hover { background: var(--primary-hover); }
.btn-outline {
  background: var(--card); color: var(--text);
  border: 1px solid var(--border); border-radius: var(--radius);
  padding: 8px 20px; font-size: 14px; cursor: pointer;
  transition: background .2s;
}
.btn-outline:hover { background: #f0f2f7; }
.btn-danger {
  background: none; color: var(--danger);
  border: 1px solid var(--danger); border-radius: var(--radius);
  padding: 4px 10px; font-size: 13px; cursor: pointer;
  transition: all .2s;
}
.btn-danger:hover { background: var(--danger); color: #fff; }
.btn-edit {
  background: none; color: var(--primary);
  border: 1px solid var(--primary); border-radius: var(--radius);
  padding: 4px 10px; font-size: 13px; cursor: pointer; margin-right: 6px;
  transition: all .2s;
}
.btn-edit:hover { background: var(--primary); color: #fff; }

/* 统计卡片 */
.stats-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-bottom: 20px; }
.stat-card {
  background: var(--card); border-radius: var(--radius);
  padding: 20px 24px; box-shadow: var(--shadow);
}
.stat-label { font-size: 13px; color: var(--text-secondary); margin-bottom: 4px; }
.stat-value { font-size: 28px; font-weight: 700; }

/* 图表 */
.charts-row {
  display: grid; grid-template-columns: 1fr 1fr; gap: 16px;
  margin-bottom: 20px;
}
.chart-card {
  background: var(--card); border-radius: var(--radius);
  padding: 16px 20px; box-shadow: var(--shadow);
}
.chart-title {
  font-size: 13px; color: var(--text-secondary);
  margin-bottom: 8px; font-weight: 500;
}
.chart-wrap { position: relative; height: 260px; }

@media (max-width: 640px) {
  .charts-row { grid-template-columns: 1fr; }
  .chart-wrap { height: 240px; }
}

/* 筛选栏 */
.filters {
  display: flex; gap: 10px; align-items: center;
  margin-bottom: 16px; flex-wrap: wrap;
}
.filters select {
  padding: 7px 12px; border: 1px solid var(--border);
  border-radius: var(--radius); font-size: 13px;
  background: var(--card); outline: none; cursor: pointer;
}
.filter-result { font-size: 13px; color: var(--text-secondary); margin-left: auto; }

/* 续费提醒 */
.upcoming {
  background: #fff8e1; border: 1px solid #ffe082;
  border-radius: var(--radius); padding: 14px 20px;
  margin-bottom: 16px;
}
.upcoming h3 { font-size: 15px; margin-bottom: 8px; }
.upcoming-item {
  display: flex; justify-content: space-between; align-items: center;
  padding: 6px 0; font-size: 14px;
}
.upcoming-item + .upcoming-item { border-top: 1px solid #ffe082; }
.upcoming-name { font-weight: 500; }
.upcoming-date { color: #e67e22; }

/* 分类分组表格 */
.category-section { margin-bottom: 24px; }

.cat-header {
  display: flex; align-items: baseline; gap: 12px;
  margin-bottom: 8px; padding: 0 4px;
}
.cat-name {
  font-size: 16px; font-weight: 700; color: var(--text);
}
.cat-meta {
  font-size: 13px; color: var(--text-secondary);
}

/* 表格 */
.table-wrap { background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow); overflow: hidden; }
table { width: 100%; border-collapse: collapse; }
thead { background: #f8f9fc; }
th {
  text-align: left; padding: 12px 16px;
  font-size: 12px; font-weight: 600; color: var(--text-secondary);
  text-transform: uppercase; letter-spacing: 0.5px;
}
th.sortable {
  cursor: pointer; user-select: none;
  transition: color .15s;
}
th.sortable:hover { color: var(--primary); }
.sort-arrow { font-size: 10px; }
td { padding: 12px 16px; font-size: 14px; border-top: 1px solid var(--border); }
tbody tr:hover { background: #fafbfd; }

/* 行高亮：过期 / 即将过期 */
.row-overdue {
  background: #fff5f5 !important;
  border-left: 3px solid #e74c3c;
}
.row-overdue td:first-child { padding-left: 13px; }

.row-upcoming {
  background: #fffdf0 !important;
  border-left: 3px solid #f39c12;
}
.row-upcoming td:first-child { padding-left: 13px; }

.row-overdue:hover { background: #ffeded !important; }
.row-upcoming:hover { background: #fff9e0 !important; }
.no-data { padding: 40px; text-align: center; color: var(--text-secondary); font-size: 14px; }

/* 状态标签 */
.tag {
  display: inline-block; padding: 2px 10px; border-radius: 12px;
  font-size: 12px; font-weight: 500;
}
.tag-active { background: #e8f5e9; color: #2e7d32; }
.tag-cancelled { background: #fce4ec; color: #c62828; }
.tag-expired { background: #eceff1; color: #546e7a; }

/* 弹窗 */
.modal {
  position: fixed; inset: 0; z-index: 900;
  background: rgba(0,0,0,0.4);
  display: flex; align-items: center; justify-content: center;
}
.modal.hidden { display: none; }
.modal-content {
  background: var(--card); border-radius: 12px;
  width: 580px; max-width: 94vw; max-height: 90vh;
  overflow-y: auto; padding: 28px 32px;
  box-shadow: 0 8px 40px rgba(0,0,0,0.15);
}
.modal-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 20px;
}
.modal-header h2 { font-size: 18px; }
.btn-close {
  background: none; border: none; font-size: 24px;
  color: var(--text-secondary); cursor: pointer; line-height: 1;
}
.btn-close:hover { color: var(--text); }

/* 表单 */
.form-group { margin-bottom: 14px; }
.form-group label {
  display: block; font-size: 13px; font-weight: 500;
  margin-bottom: 4px; color: var(--text-secondary);
}
.required { color: var(--danger); }
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%; padding: 8px 12px;
  border: 1px solid var(--border); border-radius: var(--radius);
  font-size: 14px; outline: none; transition: border .2s;
  font-family: inherit;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus { border-color: var(--primary); }
.form-row { display: flex; gap: 12px; }
.flex-1 { flex: 1; }
.flex-2 { flex: 2; }

.modal-footer {
  display: flex; justify-content: flex-end; gap: 8px;
  margin-top: 20px; padding-top: 16px;
  border-top: 1px solid var(--border);
}

/* 汇率表格 */
.rates-table {
  display: flex; flex-direction: column; gap: 4px;
  font-size: 14px;
}
.rate-row {
  display: flex; align-items: center; gap: 8px;
  padding: 4px 0;
}
.rate-row + .rate-row { border-top: 1px solid #f0f0f0; }
.rate-currency { min-width: 70px; font-weight: 500; }
.rate-value { color: var(--primary); font-weight: 600; }

.rates-updated {
  display: inline-block; margin-left: 10px;
  font-size: 12px; color: var(--text-secondary);
}

/* 设置提示 */
.settings-hint {
  font-size: 12px; color: var(--text-secondary);
  background: #f8f9fc; padding: 10px 14px;
  border-radius: var(--radius); margin-bottom: 8px; line-height: 1.8;
}
.settings-hint code { background: #e8ecf1; padding: 1px 6px; border-radius: 3px; font-size: 12px; }

/* 支付历史 */
.btn-history {
  background: none; color: #27ae60;
  border: 1px solid #27ae60; border-radius: var(--radius);
  padding: 4px 10px; font-size: 13px; cursor: pointer; margin-right: 6px;
  transition: all .2s;
}
.btn-history:hover { background: #27ae60; color: #fff; }

.payment-sub-info {
  font-size: 13px; color: var(--text-secondary);
  margin-bottom: 4px; padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}

.payment-summary {
  font-size: 14px; font-weight: 500;
  padding: 10px 0;
}

.payment-list {
  max-height: 200px; overflow-y: auto;
  border: 1px solid var(--border); border-radius: var(--radius);
  padding: 0 12px; margin-bottom: 4px;
}

.payment-row {
  display: flex; align-items: center; gap: 12px;
  padding: 8px 0; font-size: 14px;
}
.payment-row + .payment-row { border-top: 1px solid #f0f0f0; }

.payment-date { color: var(--text-secondary); min-width: 90px; font-size: 13px; }
.payment-amount { font-weight: 600; min-width: 80px; }
.payment-notes { flex: 1; color: var(--text-secondary); font-size: 13px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.payment-add-section { margin-top: 16px; }
.payment-add-section h3 {
  font-size: 15px; margin-bottom: 12px;
  padding-top: 14px; border-top: 1px solid var(--border);
}

.advance-preview {
  display: block; font-size: 12px; color: var(--primary);
  margin-top: 2px; margin-left: 24px;
}

.checkbox-label {
  display: flex !important; align-items: center; gap: 8px;
  font-size: 14px; color: var(--text); cursor: pointer;
}
.checkbox-label input[type="checkbox"] { width: auto; cursor: pointer; }

/* 响应式 */
@media (max-width: 640px) {
  .stats-row { grid-template-columns: 1fr; }
  .form-row { flex-direction: column; gap: 0; }
  header { flex-direction: column; gap: 8px; align-items: flex-start; }
  table { font-size: 12px; }
  th, td { padding: 8px 10px; }
}

/* ========== 暗色模式 ========== */

[data-theme="dark"] {
  --bg: #1a1a2e;
  --card: #252540;
  --text: #e0e0e0;
  --text-secondary: #999;
  --border: #3a3a55;
  --shadow: 0 1px 3px rgba(0,0,0,0.3);
}

[data-theme="dark"] body { background: var(--bg); }

[data-theme="dark"] .login-card {
  background: var(--card);
  box-shadow: 0 4px 24px rgba(0,0,0,0.5);
}

[data-theme="dark"] thead { background: #1e1e38; }

[data-theme="dark"] tbody tr:hover { background: #2a2a45; }

[data-theme="dark"] .btn-outline { background: var(--card); color: var(--text); }
[data-theme="dark"] .btn-outline:hover { background: #363656; }

[data-theme="dark"] .upcoming {
  background: #2d2a1a; border-color: #5a4a1a;
}
[data-theme="dark"] .upcoming-item + .upcoming-item { border-top-color: #5a4a1a; }
[data-theme="dark"] .upcoming-date { color: #f0a040; }

[data-theme="dark"] .tag-active { background: #1a3a2a; color: #4caf50; }
[data-theme="dark"] .tag-cancelled { background: #3a1a1a; color: #ef5350; }
[data-theme="dark"] .tag-expired { background: #2a2a3a; color: #888; }

[data-theme="dark"] .row-overdue { background: #2a1515 !important; }
[data-theme="dark"] .row-upcoming { background: #2a2515 !important; }
[data-theme="dark"] .row-overdue:hover { background: #3a1a1a !important; }
[data-theme="dark"] .row-upcoming:hover { background: #3a2a1a !important; }

[data-theme="dark"] .modal {
  background: rgba(0,0,0,0.6);
}
[data-theme="dark"] .modal-content {
  background: var(--card);
  box-shadow: 0 8px 40px rgba(0,0,0,0.5);
}

[data-theme="dark"] .settings-hint { background: #1e1e38; }
[data-theme="dark"] .settings-hint code { background: #363656; }

[data-theme="dark"] .payment-list { border-color: var(--border); }
[data-theme="dark"] .payment-row + .payment-row { border-top-color: #3a3a55; }

[data-theme="dark"] .rate-row + .rate-row { border-top-color: #3a3a55; }

[data-theme="dark"] .no-data { color: var(--text-secondary); }

[data-theme="dark"] input,
[data-theme="dark"] select,
[data-theme="dark"] textarea {
  background: #1a1a32; color: var(--text);
  border-color: var(--border);
}

[data-theme="dark"] .modal-footer { border-top-color: var(--border); }

[data-theme="dark"] .payment-sub-info,
[data-theme="dark"] .payment-summary { border-bottom-color: var(--border); }

[data-theme="dark"] .payment-add-section h3 { border-top-color: var(--border); }

[data-theme="dark"] .cat-header { color: var(--text); }

[data-theme="dark"] a { color: #7b9cf6; }