:root {
    --color-bg: #ffffff;
    --color-text: #1a1a1a;
    --color-primary: #007bff;
    --color-secondary: #6c757d;
    --color-card-bg: #f8f9fa;
    --color-border: #dee2e6;
    --color-success: #28a745;
    --color-danger: #dc3545;
}
[data-theme='dark'] {
    --color-bg: #1a1a1a;
    --color-text: #e4e4e4;
    --color-primary: #3e92cc;
    --color-secondary: #aaa;
    --color-card-bg: #2c2c2c;
    --color-border: #444;
    --color-success: #2ea043;
    --color-danger: #da3633;
}

*, *::before, *::after { box-sizing: border-box; }
body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--color-bg);
    color: var(--color-text);
    margin: 0;
    transition: background-color 0.3s, color 0.3s;
}

/* --- LAYOUT --- */
.app-layout { min-height: 100vh; display: flex; flex-direction: column; }
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 5%;
    border-bottom: 1px solid var(--color-border);
    background-color: var(--color-card-bg);
}
.header-left { display: flex; align-items: center; gap: 32px; }
.logo { display: flex; align-items: center; text-decoration: none; }
.logo-img { height: 32px; width: auto; }
nav { display: flex; gap: 8px; }
.nav-link {
    padding: 6px 14px;
    border-radius: 6px;
    color: var(--color-text);
    text-decoration: none;
    font-size: 0.9rem;
    transition: background 0.2s;
}
.nav-link:hover { background: var(--color-border); }
.nav-link.active { background: var(--color-primary); color: #fff; }
main { flex: 1; padding: 24px 5%; max-width: 1200px; margin: 0 auto; width: 100%; }

/* --- COMMON --- */
.page-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 24px; flex-wrap: wrap; gap: 12px; }
.page-header h2 { margin: 0; font-size: 1.5rem; }
.period-label { color: var(--color-secondary); font-size: 0.9rem; }
.section { margin-top: 32px; }
.section h3 { margin-bottom: 16px; }

/* --- CARDS --- */
.summary-cards { display: flex; gap: 20px; margin-bottom: 32px; flex-wrap: wrap; }
.card {
    background-color: var(--color-card-bg);
    padding: 24px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.08);
    flex: 1;
    min-width: 180px;
    text-align: center;
}
.card-label { display: block; font-size: 0.85rem; color: var(--color-secondary); margin-bottom: 6px; }
.card-value { display: block; font-size: 1.6rem; font-weight: 700; }
.card-value.income { color: var(--color-success, #27ae60); }
.card-value.expense { color: var(--color-danger, #e74c3c); }

/* --- TABLE --- */
.data-table {
    width: 100%;
    border-collapse: collapse;
    background-color: var(--color-card-bg);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 4px rgba(0,0,0,0.08);
}
.data-table th {
    background-color: var(--color-primary);
    color: #fff;
    padding: 12px 16px;
    text-align: left;
    font-weight: 600;
    font-size: 0.85rem;
}
.data-table td { padding: 5px 10px; border-bottom: 1px solid var(--color-border); }
.data-table tr:last-child td { border-bottom: none; }

/* --- BUTTONS --- */
.btn, button {
    background-color: var(--color-primary);
    color: #fff;
    border: none;
    padding: 10px 10px;
    cursor: pointer;
    border-radius: 6px;
    font-size: 0.9rem;
    transition: opacity 0.2s;
}
.btn:hover, button:hover { opacity: 0.85; }
.btn-secondary { background-color: var(--color-secondary); }

/* --- FORMS --- */
.form-card {
    background: var(--color-card-bg);
    padding: 24px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.08);
    margin-bottom: 24px;
}
.form-card h3 { margin: 0 0 16px; }
.form-card form { display: flex; flex-direction: column; gap: 12px; max-width: 400px; }
.form-card label { display: flex; flex-direction: column; gap: 4px; font-size: 0.9rem; color: var(--color-secondary); }
.form-card input, .form-card select {
    padding: 8px 12px;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    background: var(--color-bg);
    color: var(--color-text);
    font-size: 0.95rem;
}
.form-card .btn { align-self: flex-start; }

/* --- PERIOD FORM --- */
.period-form { display: flex; gap: 12px; align-items: flex-end; flex-wrap: wrap; }
.period-form label { display: flex; flex-direction: column; gap: 4px; font-size: 0.85rem; color: var(--color-secondary); }
.period-form select { padding: 8px 12px; border: 1px solid var(--color-border); border-radius: 6px; background: var(--color-bg); color: var(--color-text); }

/* --- BUDGETS --- */
.budgets-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 20px; }
.month-nav { display: flex; align-items: center; gap: 10px; margin-bottom: 20px; flex-wrap: wrap; }
.month-label { font-size: 1.3rem; font-weight: 600; min-width: 120px; text-align: center; }
.budget-grid { display: grid; gap: 2px; background: var(--color-border); border-radius: 8px; overflow: hidden; }
.budget-grid-header,
.budget-grid-row { display: grid; grid-template-columns: 1fr 120px 140px 120px; gap: 1px; background: var(--color-card-bg); padding: 10px 14px; align-items: center; }
.budget-grid-header { background: var(--color-bg); font-weight: 600; font-size: 0.85rem; color: var(--color-secondary); }
.bg-col-cat { font-weight: 500; }
.bg-col-tpl, .bg-col-month { text-align: right; }
.bg-col-actions { text-align: right; display: flex; gap: 4px; justify-content: flex-end; }
.budget-grid-row.bg-override { background: #fffae0; }
[data-theme="dark"] .budget-grid-row.bg-override { background: #3a3520; }
.checkbox-label { display: flex; align-items: center; gap: 8px; cursor: pointer; font-size: 0.95rem; }
.radio-group { display: flex; flex-direction: column; gap: 6px; margin: 8px 0; }
.radio-label { display: flex; align-items: center; gap: 8px; cursor: pointer; font-size: 0.95rem; }
.period-fields { display: flex; flex-wrap: wrap; gap: 10px; margin: 8px 0; padding: 10px; background: var(--color-bg); border-radius: 6px; }
.period-fields label { display: flex; align-items: center; gap: 6px; font-size: 0.9rem; }
.period-fields select { padding: 6px 8px; border: 1px solid var(--color-border); border-radius: 6px; background: var(--color-card-bg); color: var(--color-text); }

/* --- FILTER BAR --- */
.filter-bar { display: flex; gap: 12px; align-items: flex-end; flex-wrap: nowrap; margin-bottom: 20px; background: var(--color-card-bg); padding: 12px 16px; border-radius: 8px; box-shadow: 0 2px 4px rgba(0,0,0,0.08); }
.filter-bar label { display: flex; flex-direction: column; gap: 4px; font-size: 0.85rem; color: var(--color-secondary); white-space: nowrap; }
.filter-bar select, .filter-bar input { padding: 6px 10px; border: 1px solid var(--color-border); border-radius: 6px; background: var(--color-bg); color: var(--color-text); }
.filter-bar .btn { padding: 6px 14px; white-space: nowrap; }

/* --- PAGINATION --- */
.pagination { display: flex; align-items: center; gap: 8px; margin-top: 20px; flex-wrap: wrap; }
.pagination button:disabled { opacity: 0.4; cursor: default; }

/* --- ADMIN --- */
.admin-grid { display: grid; grid-template-columns: 1fr; gap: 24px; max-width: 1200px; margin: 0 auto; }
.admin-card { text-align: left; overflow-x: auto; }
.admin-card h3 { margin: 0 0 16px; }
.admin-card form { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 16px; align-items: flex-end; }
.admin-card form input { flex: 1; min-width: 100px; padding: 8px 12px; border: 1px solid var(--color-border); border-radius: 6px; background: var(--color-bg); color: var(--color-text); }
.admin-card form .btn { flex-shrink: 0; white-space: nowrap; }
.admin-card label { font-size: 0.85rem; color: var(--color-secondary); width: 100%; }
.admin-card input,
.admin-card select { padding: 8px 12px; border: 1px solid var(--color-border); border-radius: 6px; background: var(--color-bg); color: var(--color-text); }
.admin-card .data-table { table-layout: fixed; }
.admin-card .data-table th, .admin-card .data-table td { word-break: break-word; overflow-wrap: break-word; }
.admin-card .data-table td input[type="text"] { width: 100%; min-width: 0; box-sizing: border-box; }
.backup-output { margin-top: 12px; padding: 12px; background: var(--color-bg); border-radius: 6px; font-size: 0.85rem; white-space: pre-wrap; word-break: break-word; }

/* --- ERROR --- */
.error-container { min-height: 100vh; display: flex; flex-direction: column; }
.error-container .logo { display: flex; align-items: center; text-decoration: none; }
.error-main { flex: 1; display: flex; align-items: center; justify-content: center; padding: 40px 20px; }
.error-card { text-align: center; background: var(--color-card-bg); padding: 60px 80px; border-radius: 12px; box-shadow: 0 4px 6px rgba(0,0,0,0.1); }
.error-code { display: block; font-size: 6rem; font-weight: 800; color: var(--color-primary); line-height: 1; margin-bottom: 16px; }
.error-message { font-size: 1.2rem; color: var(--color-secondary); margin-bottom: 32px; }

/* --- RESPONSIVE --- */
/* --- AUTH PAGE --- */
.auth-body { min-height: 100vh; display: flex; align-items: center; justify-content: center; }
.auth-container { width: 100%; max-width: 400px; padding: 20px; }
.auth-card { background: var(--color-card-bg); border-radius: 12px; padding: 40px; box-shadow: 0 4px 6px rgba(0,0,0,0.1); text-align: center; }
.auth-logo { font-size: 1.8rem; color: var(--color-primary); margin: 0 0 24px; }
.auth-card h2 { margin: 0 0 20px; font-size: 1.2rem; }
.auth-card form { display: flex; flex-direction: column; gap: 16px; text-align: left; }
.auth-card label { display: flex; flex-direction: column; gap: 4px; font-size: 0.9rem; color: var(--color-secondary); }
.auth-card input { padding: 10px 14px; border: 1px solid var(--color-border); border-radius: 6px; background: var(--color-bg); color: var(--color-text); font-size: 1rem; }
.auth-btn { width: 100%; padding: 12px; font-size: 1rem; margin-top: 8px; }
.auth-switch { margin-top: 20px; font-size: 0.9rem; color: var(--color-secondary); }
.auth-switch a { color: var(--color-primary); text-decoration: none; }
.auth-error { background: #dc3545; color: #fff; padding: 10px; border-radius: 6px; margin-bottom: 16px; font-size: 0.9rem; }

/* --- HEADER RIGHT --- */
.header-right { display: flex; align-items: center; gap: 12px; }
.user-email { font-size: 0.85rem; color: var(--color-secondary); }
.btn-logout { background: transparent; color: var(--color-secondary); border: 1px solid var(--color-border); padding: 6px 14px; font-size: 0.85rem; border-radius: 6px; cursor: pointer; }
.btn-logout:hover { background: var(--color-border); opacity: 1; }

/* --- UTILITY --- */
.hidden { display: none !important; }
.text-secondary { font-size: 0.85rem; color: var(--color-secondary); }
.mt-8 { margin-top: 8px; }
.mb-8 { margin-bottom: 8px; }
.ml-auto { margin-left: auto; }
.flex-row { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.flex-between { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; }
.flex-end { display: flex; align-items: flex-end; }
.table-responsive { overflow-x: auto; -webkit-overflow-scrolling: touch; }
.sortable { cursor: pointer; }

/* --- CARD VARIANTS --- */
.card-full { grid-column: 1 / -1; }
.card-left { text-align: left; }
.card-value-sm { font-size: 1.2rem; }
.card-value-md { font-size: 1.3rem; }
.card-savings { grid-column: 1 / -1; text-align: left; }
.card-detail { grid-column: 1 / -1; padding: 12px; }
.card-detail-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; }

/* --- BUTTON VARIANTS --- */
.btn-icon { margin-right: 4px; }
.btn-sm { padding: 6px 12px; font-size: 0.85rem; }

/* --- FORM HELPERS --- */
.form-row { display: flex; gap: 8px; flex-wrap: wrap; }
.form-row + .form-row { margin-top: 8px; }
.form-row input.flex-2 { flex: 2; min-width: 140px; }
.form-row input.max-w-70 { max-width: 70px; }
.form-row input.flex-1 { flex: 1; min-width: 100px; }
.form-row select.flex-1 { flex: 1; min-width: 100px; }
.input-sm { width: 80px; }
.input-wide { width: 100%; box-sizing: border-box; }

/* --- SETTINGS FORM --- */
.settings-form { max-width: 600px; }
.settings-fieldset { border: 1px solid var(--color-border); border-radius: 6px; padding: 12px; margin: 8px 0; }
.settings-legend { font-size: 0.85rem; color: var(--color-secondary); }
.settings-proxy-row { display: flex; gap: 8px; flex-wrap: wrap; }
.settings-proxy-row + .settings-proxy-row { margin-top: 8px; }
.settings-proxy-row label.flex-2 { flex: 2; min-width: 140px; }
.settings-proxy-row label.flex-1 { flex: 1; min-width: 70px; }
.settings-proxy-row input { width: 100%; }
.settings-check-row { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.settings-check-result { font-size: 0.85rem; }

/* --- FILTER BAR HELPERS --- */
.filter-bar-presets { display: flex; flex-wrap: wrap; gap: 4px; }
.filter-bar-controls { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }

/* --- MOBILE NAV --- */
#nav-toggle { display: none; background: none; border: none; font-size: 1.5rem; cursor: pointer; color: var(--color-text); padding: 4px 8px; min-height: 44px; min-width: 44px; }

/* --- PAGE SPECIFIC --- */
.cell-icon { font-size: 1.4rem; }

/* --- MOBILE --- */
@media (max-width: 1024px) {
    header { flex-wrap: wrap; gap: 0; }
    #nav-toggle { display: inline-flex; }
    nav { display: none; flex-direction: column; width: 100%; gap: 4px; margin-top: 8px; }
    nav.nav-open { display: flex; }
    .header-left { order: 2; flex-direction: column; align-items: flex-start; gap: 8px; width: 100%; }
    .header-right { order: 1; margin-left: auto; }
    main { padding: 16px 4%; }
    header { padding: 8px 4%; }
    .page-header { flex-direction: column; align-items: flex-start; }
    .page-header h2 { font-size: 1.25rem; }
    .summary-cards { flex-direction: column; }
    .card { padding: 16px; }
    .card-value { font-size: 1.4rem; }
    .period-form { flex-direction: column; align-items: stretch; }
    .period-form .flex-row div { display: flex; flex-wrap: wrap; gap: 6px; justify-content: center; }
    .period-form .btn { flex: 1 1 auto; min-width: 0; padding: 6px 10px; font-size: 0.85rem; }
    .filter-bar { flex-direction: column; align-items: stretch; }
    .filter-bar-presets { display: flex; flex-wrap: wrap; gap: 6px; justify-content: center; }
    .filter-bar-presets .btn { flex: 1 1 auto; min-width: 0; padding: 6px 10px; font-size: 0.85rem; }
    .filter-bar-controls { display: flex; flex-direction: column; gap: 8px; }
    .filter-bar-controls label { width: 100%; }
    .filter-bar select, .filter-bar input { width: 100%; }
    .data-table th, .data-table td { padding: 6px 8px; font-size: 0.85rem; }
    #tx-main-table { display: block; }
    #tx-main-table thead { display: none; }
    #tx-main-table tr { display: flex; flex-wrap: wrap; padding: 8px 12px; margin-bottom: 8px; border-radius: 8px; box-shadow: 0 1px 3px rgba(0,0,0,0.08); background: var(--color-card-bg); align-items: center; }
    #tx-main-table td { border: none; padding: 2px 4px; }
    #tx-main-table td:nth-child(1) { font-weight: 600; }
    #tx-main-table td:nth-child(3) { font-weight: 600; margin-left: auto; }
    #tx-main-table td:nth-child(5) { color: var(--color-secondary); }
    #tx-main-table td:nth-child(6) { color: var(--color-secondary); font-size: 0.85rem; }
    #tx-main-table td:nth-child(7) { margin-left: auto; }
    .form-card { padding: 16px; }
    .form-card form { max-width: 100%; }
    .pagination { justify-content: center; }
    .settings-proxy-row { flex-direction: column; }
    .settings-proxy-row label { min-width: 100%; }
    .error-card { padding: 40px 24px; }
    .error-code { font-size: 4rem; }
    .auth-card { padding: 24px; }
}

@media (max-width: 640px) {
    .card-value { font-size: 1.2rem; }
    .page-header h2 { font-size: 1.1rem; }
    .card { padding: 12px; }
    .btn, button { padding: 8px 12px; }
    .data-table th, .data-table td { padding: 4px 6px; font-size: 0.8rem; }
    .error-card { padding: 24px 16px; }
    .error-code { font-size: 3rem; }
}

/* --- MOBILE JS FALLBACK (for devices ignoring @media viewport) --- */
.mobile header { flex-wrap: wrap; gap: 0; }
.mobile #nav-toggle { display: inline-flex; }
.mobile nav { display: none; flex-direction: column; width: 100%; gap: 4px; margin-top: 8px; }
.mobile nav.nav-open { display: flex; }
.mobile .header-left { order: 2; flex-direction: column; align-items: flex-start; gap: 8px; width: 100%; }
.mobile .header-right { order: 1; margin-left: auto; }
.mobile main { padding: 16px 4%; }
.mobile header { padding: 8px 4%; }
.mobile .page-header { flex-direction: column; align-items: flex-start; }
.mobile .page-header h2 { font-size: 1.25rem; }
.mobile .summary-cards { flex-direction: column; }
.mobile .card { padding: 16px; }
.mobile .card-value { font-size: 1.4rem; }
.mobile .period-form { flex-direction: column; align-items: stretch; }
.mobile .period-form .flex-row div { display: flex; flex-wrap: wrap; gap: 6px; justify-content: center; }
.mobile .period-form .btn { flex: 1 1 auto; min-width: 0; padding: 6px 10px; font-size: 0.85rem; }
.mobile .filter-bar { flex-direction: column; align-items: stretch; }
.mobile .filter-bar-presets { display: flex; flex-wrap: wrap; gap: 6px; justify-content: center; }
.mobile .filter-bar-presets .btn { flex: 1 1 auto; min-width: 0; padding: 6px 10px; font-size: 0.85rem; }
.mobile .filter-bar-controls { display: flex; flex-direction: column; gap: 8px; }
.mobile .filter-bar-controls label { width: 100%; }
.mobile .filter-bar select, .mobile .filter-bar input { width: 100%; }
.mobile .data-table th, .mobile .data-table td { padding: 6px 8px; font-size: 0.85rem; }
.mobile #tx-main-table { display: block; }
.mobile #tx-main-table thead { display: none; }
.mobile #tx-main-table tr { display: flex; flex-wrap: wrap; padding: 8px 12px; margin-bottom: 8px; border-radius: 8px; box-shadow: 0 1px 3px rgba(0,0,0,0.08); background: var(--color-card-bg); align-items: center; }
.mobile #tx-main-table td { border: none; padding: 2px 4px; }
.mobile #tx-main-table td:nth-child(1) { font-weight: 600; }
.mobile #tx-main-table td:nth-child(3) { font-weight: 600; margin-left: auto; }
.mobile #tx-main-table td:nth-child(5) { color: var(--color-secondary); }
.mobile #tx-main-table td:nth-child(6) { color: var(--color-secondary); font-size: 0.85rem; }
.mobile #tx-main-table td:nth-child(7) { margin-left: auto; }
.mobile .form-card { padding: 16px; }
.mobile .form-card form { max-width: 100%; }
.mobile .pagination { justify-content: center; }
.mobile .settings-proxy-row { flex-direction: column; }
.mobile .settings-proxy-row label { min-width: 100%; }
.mobile .error-card { padding: 40px 24px; }
.mobile .error-code { font-size: 4rem; }
.mobile .auth-card { padding: 24px; }
.mobile .card-value { font-size: 1.2rem; }
.mobile .page-header h2 { font-size: 1.1rem; }
.mobile .card { padding: 12px; }
.mobile .btn, .mobile button { padding: 8px 12px; }
.mobile .data-table th, .mobile .data-table td { padding: 4px 6px; font-size: 0.8rem; }
.mobile .error-card { padding: 24px 16px; }
.mobile .error-code { font-size: 3rem; }