:root {
    --primary: #2563EB;
    --secondary: #0EA5E9;
    --success: #16A34A;
    --danger: #DC2626;
    --warning: #F59E0B;
    --bg: #F8FAFC;
    --text: #1E293B;
    --text-muted: #64748B;
    --border: #E2E8F0;
    --card: #FFFFFF;
    --card-hover: #F1F5F9;
    --sidebar-bg: #FFFFFF;
    --sidebar-text: #475569;
    --sidebar-active: #EFF6FF;
    --sidebar-active-text: #2563EB;
    --topbar-bg: rgba(248,250,252,0.85);
    --shadow: 0 1px 3px rgba(15,23,42,0.06), 0 1px 2px rgba(15,23,42,0.04);
    --shadow-lg: 0 10px 25px rgba(15,23,42,0.08);
    --radius: 16px;
}

[data-theme="dark"] {
    --bg: #0F172A;
    --text: #E2E8F0;
    --text-muted: #94A3B8;
    --border: #1E293B;
    --card: #1E293B;
    --card-hover: #273449;
    --sidebar-bg: #111C2E;
    --sidebar-text: #94A3B8;
    --sidebar-active: #1E3A8A;
    --sidebar-active-text: #93C5FD;
    --topbar-bg: rgba(15,23,42,0.85);
    --shadow: 0 1px 3px rgba(0,0,0,0.3);
    --shadow-lg: 0 10px 25px rgba(0,0,0,0.4);
    color-scheme: dark;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    background: var(--bg);
    color: var(--text);
    font-size: 14px;
    line-height: 1.5;
    min-height: 100vh;
    transition: background 0.3s ease, color 0.3s ease;
}

/* ---- App shell ---- */
.app-shell {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 260px;
    background: var(--sidebar-bg);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    z-index: 1040;
    transition: transform 0.3s ease;
}

.main-content {
    flex: 1;
    margin-left: 260px;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.page-container {
    padding: 24px;
    max-width: 1200px;
    width: 100%;
    margin: 0 auto;
    flex: 1;
}

/* ---- Sidebar ---- */
.sidebar-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 20px 20px;
    border-bottom: 1px solid var(--border);
}

.brand-icon {
    width: 42px;
    height: 42px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: #fff;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    box-shadow: 0 4px 12px rgba(37,99,235,0.3);
}

.brand-text .brand-name { font-weight: 700; font-size: 18px; letter-spacing: 0.5px; }
.brand-text .brand-tag { font-size: 11px; color: var(--text-muted); }

.sidebar-close { background: none; border: none; color: var(--text-muted); font-size: 18px; margin-left: auto; cursor: pointer; }

.sidebar-nav { flex: 1; padding: 12px; overflow-y: auto; }

.nav-section-label {
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
    font-weight: 600;
    padding: 14px 12px 6px;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    border-radius: 10px;
    color: var(--sidebar-text);
    text-decoration: none;
    margin-bottom: 2px;
    transition: background 0.2s ease, color 0.2s ease;
}

.nav-link i { font-size: 18px; width: 20px; text-align: center; }

.nav-link:hover { background: var(--card-hover); color: var(--text); }

.nav-link.active { background: var(--sidebar-active); color: var(--sidebar-active-text); font-weight: 600; }

.sidebar-footer { padding: 16px; border-top: 1px solid var(--border); }

.theme-toggle {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-muted);
    font-size: 13px;
}

.theme-switch {
    width: 42px;
    height: 22px;
    border-radius: 11px;
    background: var(--border);
    border: none;
    position: relative;
    cursor: pointer;
    transition: background 0.3s;
}

.theme-switch::after {
    content: '';
    position: absolute;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: #fff;
    top: 2px;
    left: 2px;
    transition: transform 0.3s;
    box-shadow: 0 1px 2px rgba(0,0,0,0.2);
}

[data-theme="dark"] .theme-switch { background: var(--primary); }
[data-theme="dark"] .theme-switch::after { transform: translateX(20px); }

/* ---- Topbar ---- */
.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 24px;
    background: var(--topbar-bg);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 1030;
}

.topbar-left { display: flex; align-items: center; gap: 12px; }

.page-title { font-size: 18px; font-weight: 600; }

.sidebar-toggle, .icon-btn {
    background: none;
    border: none;
    color: var(--text);
    font-size: 22px;
    cursor: pointer;
    border-radius: 8px;
    padding: 6px;
}

.icon-btn:hover { background: var(--card-hover); }

.topbar-right { display: flex; align-items: center; gap: 10px; }

.user-button {
    display: flex;
    align-items: center;
    gap: 10px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    border-radius: 10px;
}

.user-button:hover { background: var(--card-hover); }

.avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    text-transform: uppercase;
}

.user-name { font-weight: 600; font-size: 13px; text-align: left; }
.user-role { font-size: 11px; color: var(--text-muted); text-align: left; }

/* ---- Cards ---- */
.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover { box-shadow: var(--shadow-lg); }

.card-body { padding: 20px; }
.card-header, .card-title { font-weight: 600; font-size: 15px; }

/* ---- Summary cards ---- */
.summary-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.summary-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: var(--shadow);
    position: relative;
    overflow: hidden;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.summary-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }

.summary-card .sc-icon {
    width: 44px; height: 44px;
    border-radius: 12px;
    display: flex; align-items: center; justify-content: center;
    font-size: 22px;
    margin-bottom: 14px;
}

.summary-card .sc-label { color: var(--text-muted); font-size: 12px; }
.summary-card .sc-value { font-size: 22px; font-weight: 700; margin-top: 4px; }

.sc-income .sc-icon { background: #F0FDF4; color: var(--success); }
.sc-expense .sc-icon { background: #FEF2F2; color: var(--danger); }
.sc-balance .sc-icon { background: #EFF6FF; color: var(--primary); }
.sc-count .sc-icon { background: #FFF7ED; color: var(--warning); }

[data-theme="dark"] .sc-income .sc-icon { background: #14532D; }
[data-theme="dark"] .sc-expense .sc-icon { background: #7F1D1D; }
[data-theme="dark"] .sc-balance .sc-icon { background: #1E3A8A; }
[data-theme="dark"] .sc-count .sc-icon { background: #78350F; }

/* ---- Buttons ---- */
.btn { border-radius: 10px; font-weight: 600; padding: 9px 18px; font-size: 14px; border: none; transition: all 0.2s ease; }
.btn-primary { background: var(--primary); }
.btn-primary:hover { background: #1D4ED8; }
.btn-success { background: var(--success); }
.btn-danger { background: var(--danger); }
.btn-light { background: var(--card); color: var(--text); border: 1px solid var(--border); }
.btn-light:hover { background: var(--card-hover); }

.btn-sm { padding: 5px 10px; font-size: 12px; border-radius: 8px; }

.btn-add-transaction {
    position: fixed;
    bottom: 24px;
    right: 24px;
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: var(--primary);
    color: #fff;
    font-size: 26px;
    border: none;
    box-shadow: 0 6px 16px rgba(37,99,235,0.4);
    display: flex; align-items: center; justify-content: center;
    z-index: 1050;
    display: none;
}

/* ---- Forms ---- */
.form-control, .form-select {
    border-radius: 10px;
    padding: 10px 14px;
    border: 1px solid var(--border);
    background: var(--card);
    color: var(--text);
    font-size: 14px;
}

.form-control:focus, .form-select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37,99,235,0.15);
    background: var(--card);
    color: var(--text);
}

.form-label { font-size: 13px; font-weight: 600; color: var(--text); }

.form-section-card { margin-bottom: 16px; }

[data-theme="dark"] .form-control, [data-theme="dark"] .form-select {
    background: #0F172A;
    color: #E2E8F0;
}

/* ---- Table ---- */
.table-responsive { border-radius: var(--radius); }

.table { margin-bottom: 0; color: var(--text); }
.table thead th {
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    background: var(--card-hover);
    border-bottom: 1px solid var(--border);
    font-weight: 600;
    padding: 10px 14px;
}
.table tbody td { padding: 12px 14px; border-bottom: 1px solid var(--border); vertical-align: middle; }
.table tbody tr:hover { background: var(--card-hover); }

.badge { font-weight: 600; border-radius: 6px; padding: 5px 10px; font-size: 11px; }
.badge-income { background: #F0FDF4; color: #15803D; }
.badge-expense { background: #FEF2F2; color: #B91C1C; }
[data-theme="dark"] .badge-income { background: #14532D; color: #86EFAC; }
[data-theme="dark"] .badge-expense { background: #7F1D1D; color: #FCA5A5; }

.amount-income { color: var(--success); font-weight: 600; }
.amount-expense { color: var(--danger); font-weight: 600; }

/* ---- Filters ---- */
.filters-card { margin-bottom: 20px; }
.filters-row { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.filter-item { flex: 1; min-width: 150px; }

/* ---- Empty state ---- */
.empty-state {
    text-align: center;
    padding: 50px 20px;
    color: var(--text-muted);
}
.empty-state i { font-size: 48px; color: var(--border); margin-bottom: 12px; display: block; }
.empty-state h4 { color: var(--text); margin-bottom: 6px; }

/* ---- Charts ---- */
.chart-box { min-height: 280px; position: relative; }
.chart-box canvas { max-height: 320px; }

/* ---- Auth page ---- */
.auth-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg);
    padding: 20px;
    position: relative;
    overflow: hidden;
}

.auth-page::before {
    content: '';
    position: absolute;
    top: -200px; right: -200px;
    width: 500px; height: 500px;
    background: radial-gradient(circle, rgba(37,99,235,0.12), transparent 70%);
}

.auth-page::after {
    content: '';
    position: absolute;
    bottom: -200px; left: -200px;
    width: 500px; height: 500px;
    background: radial-gradient(circle, rgba(14,165,233,0.12), transparent 70%);
}

.auth-card {
    width: 100%;
    max-width: 400px;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 20px;
    box-shadow: var(--shadow-lg);
    padding: 36px 32px;
    position: relative;
    z-index: 1;
}

.auth-logo {
    text-align: center;
    margin-bottom: 8px;
}

.auth-logo .logo-circle {
    width: 60px; height: 60px;
    margin: 0 auto;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 16px;
    display: flex; align-items: center; justify-content: center;
    color: #fff;
    font-size: 28px;
    box-shadow: 0 8px 20px rgba(37,99,235,0.35);
}

.auth-title { text-align: center; font-size: 26px; font-weight: 700; color: var(--primary); letter-spacing: 1px; }
.auth-subtitle { text-align: center; color: var(--text-muted); margin-bottom: 28px; font-size: 13px; }

.auth-btn { width: 100%; padding: 12px; font-size: 15px; }

/* ---- Toasts ---- */
.toast-msg {
    position: fixed;
    top: 20px;
    right: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 16px;
    border-radius: 12px;
    color: #fff;
    z-index: 2000;
    box-shadow: 0 8px 24px rgba(0,0,0,0.15);
    animation: slideIn 0.3s ease;
    max-width: 360px;
}
.toast-success { background: var(--success); }
.toast-error { background: var(--danger); }
.toast-info { background: var(--secondary); }
.toast-close { background: none; border: none; color: #fff; margin-left: 8px; cursor: pointer; font-size: 16px; }

@keyframes slideIn { from { transform: translateX(20px); opacity: 0; } to { transform: translateX(0); opacity: 1; } }

/* ---- Error pages ---- */
.error-page { text-align: center; padding: 80px 20px; }
.error-page .code { font-size: 72px; font-weight: 700; color: var(--primary); }
.error-page p { color: var(--text-muted); }

/* ---- Footer ---- */
.app-footer {
    padding: 16px 24px;
    display: flex;
    justify-content: space-between;
    color: var(--text-muted);
    font-size: 12px;
    border-top: 1px solid var(--border);
}
.version { color: var(--text-muted); }

/* ---- Pagination ---- */
.pagination { gap: 4px; }
.page-link {
    background: var(--card);
    border: 1px solid var(--border);
    color: var(--text);
    border-radius: 8px;
    padding: 7px 12px;
}
.page-link:hover { background: var(--card-hover); color: var(--primary); }
.page-item.active .page-link { background: var(--primary); border-color: var(--primary); color: #fff; }
.page-item.disabled .page-link { opacity: 0.5; }

/* ---- Sidebar overlay (mobile) ---- */
.sidebar-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(15,23,42,0.5);
    z-index: 1039;
    display: none;
}

/* ---- Responsive ---- */
@media (max-width: 991px) {
    .sidebar { transform: translateX(-100%); width: 280px; }
    body.sidebar-open .sidebar { transform: translateX(0); }
    body.sidebar-open .sidebar-backdrop { display: block; }
    .main-content { margin-left: 0; }
    .btn-add-transaction { display: flex; }
    .page-container { padding: 16px; }
}

@media (max-width: 576px) {
    .summary-grid { grid-template-columns: 1fr 1fr; }
    .summary-card .sc-value { font-size: 18px; }
    .page-container { padding: 12px; }
    .topbar { padding: 12px 16px; }
}

/* ---- Misc ---- */
.section-title { font-size: 16px; font-weight: 700; margin-bottom: 16px; display: flex; align-items: center; justify-content: space-between; }

.balance-display {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: var(--radius);
    padding: 24px;
    color: #fff;
    box-shadow: 0 8px 24px rgba(37,99,235,0.3);
}

.balance-display .label { font-size: 12px; opacity: 0.85; }
.balance-display .value { font-size: 32px; font-weight: 700; margin-top: 4px; }

.stat-chip { display: inline-flex; align-items: center; gap: 6px; background: rgba(255,255,255,0.15); border-radius: 8px; padding: 6px 12px; font-size: 12px; }

.period-tabs { display: flex; gap: 6px; flex-wrap: wrap; }
.period-btn {
    background: var(--card);
    border: 1px solid var(--border);
    color: var(--text-muted);
    border-radius: 20px;
    padding: 6px 14px;
    font-size: 12px;
    cursor: pointer;
    transition: all 0.2s;
}
.period-btn:hover { border-color: var(--primary); color: var(--primary); }
.period-btn.active { background: var(--primary); color: #fff; border-color: var(--primary); }

.text-muted { color: var(--text-muted) !important; }

.report-actions { display: flex; gap: 8px; flex-wrap: wrap; }

.report-table td.money { text-align: right; font-weight: 600; }

.weekday-card { border-radius: 12px; }