:root {
    --sidebar-width: 240px;
    --sidebar-bg: #1e293b;
    --sidebar-color: #cbd5e1;
    --sidebar-active: #3b82f6;
    --header-height: 56px;
    --body-bg: #f1f5f9;
    --card-bg: #ffffff;
    --text-color: #1e293b;
    --border-color: #e2e8f0;
}

[data-theme="dark"] {
    --sidebar-bg: #0f172a;
    --sidebar-color: #94a3b8;
    --body-bg: #0f172a;
    --card-bg: #1e293b;
    --text-color: #e2e8f0;
    --border-color: #334155;
}

* { box-sizing: border-box; }

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: var(--body-bg);
    color: var(--text-color);
    margin: 0;
    min-height: 100vh;
}

.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--sidebar-bg);
    color: var(--sidebar-color);
    z-index: 1000;
    overflow-y: auto;
    transition: transform 0.3s;
}

.sidebar-brand {
    padding: 16px 20px;
    font-size: 16px;
    font-weight: 600;
    color: #fff;
    border-bottom: 1px solid rgba(255,255,255,.1);
    display: flex;
    align-items: center;
    gap: 8px;
}

.sidebar-nav { padding: 12px 0; }

.sidebar-nav .nav-link {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 20px;
    color: var(--sidebar-color);
    text-decoration: none;
    font-size: 14px;
    transition: all 0.2s;
}

.sidebar-nav .nav-link:hover {
    background: rgba(255,255,255,.08);
    color: #fff;
}

.sidebar-nav .nav-link.active {
    background: var(--sidebar-active);
    color: #fff;
}

.sidebar-nav .nav-section {
    padding: 16px 20px 6px;
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: #64748b;
}

.main-wrapper {
    margin-left: var(--sidebar-width);
    min-height: 100vh;
}

.top-header {
    height: var(--header-height);
    background: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    position: sticky;
    top: 0;
    z-index: 100;
}

.main-content { padding: 24px; }

.stat-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 20px;
    height: 100%;
}

.stat-card .stat-label {
    font-size: 13px;
    color: #64748b;
    margin-bottom: 8px;
}

.stat-card .stat-value {
    font-size: 24px;
    font-weight: 700;
}

.stat-card.income .stat-value { color: #16a34a; }
.stat-card.expense .stat-value { color: #dc2626; }
.stat-card.balance .stat-value { color: #2563eb; }

.card-panel {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin-bottom: 20px;
}

.card-panel .card-header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color);
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.card-panel .card-body { padding: 20px; }

.table { color: var(--text-color); }

[data-theme="dark"] .table {
    --bs-table-bg: transparent;
    --bs-table-color: var(--text-color);
    --bs-table-border-color: var(--border-color);
}

[data-theme="dark"] .form-control,
[data-theme="dark"] .form-select {
    background: #0f172a;
    border-color: var(--border-color);
    color: var(--text-color);
}

[data-theme="dark"] .form-control:focus,
[data-theme="dark"] .form-select:focus {
    background: #0f172a;
    color: var(--text-color);
}

.badge-income { background: #dcfce7; color: #16a34a; }
.badge-expense { background: #fee2e2; color: #dc2626; }
.badge-wechat { background: #dcfce7; color: #16a34a; }
.badge-alipay { background: #dbeafe; color: #2563eb; }
.badge-bank { background: #fef3c7; color: #d97706; }

[data-theme="dark"] .badge-income { background: #14532d; color: #86efac; }
[data-theme="dark"] .badge-expense { background: #7f1d1d; color: #fca5a5; }

.sidebar-toggle { display: none; }

.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
}

.login-card {
    width: 100%;
    max-width: 400px;
    background: #fff;
    border-radius: 12px;
    padding: 40px;
    box-shadow: 0 20px 60px rgba(0,0,0,.3);
}

.filter-bar {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 16px;
    margin-bottom: 20px;
}

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }
    .sidebar.show {
        transform: translateX(0);
    }
    .main-wrapper {
        margin-left: 0;
    }
    .sidebar-toggle {
        display: inline-flex;
    }
    .main-content { padding: 16px; }
    .stat-card .stat-value { font-size: 20px; }
}