:root {
    --bg: #f4f6f9;
    --surface: #ffffff;
    --text: #1a1d26;
    --text-muted: #6b7280;
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --success: #059669;
    --success-dark: #047857;
    --danger: #dc2626;
    --warning: #d97706;
    --border: #e5e7eb;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
    --radius: 10px;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
    min-height: 100vh;
}

a {
    color: var(--primary);
    text-decoration: none;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 1rem 3rem;
}

.site-header {
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    margin-bottom: 2rem;
    box-shadow: var(--shadow);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem;
}

.logo {
    font-weight: 700;
    font-size: 1.15rem;
    color: var(--text);
}

.site-header nav {
    display: flex;
    gap: 1.25rem;
}

.site-header nav a {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.site-header nav a:hover {
    color: var(--primary);
}

.site-footer {
    margin-top: 3rem;
    padding: 1.5rem 0;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.85rem;
}

.page-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.page-header h1 {
    font-size: 1.6rem;
    font-weight: 700;
}

.subtitle {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-top: 0.25rem;
}

.breadcrumb {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.breadcrumb a {
    color: var(--text-muted);
}

.breadcrumb a:hover {
    color: var(--primary);
}

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
}

.card h2 {
    font-size: 1.1rem;
    margin-bottom: 1rem;
}

.summary-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.summary-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.summary-card.highlight {
    border-color: var(--primary);
    background: linear-gradient(135deg, #eff6ff, #ffffff);
}

.summary-card .label {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.summary-card .value {
    font-size: 1.5rem;
    font-weight: 700;
}

.summary-card .value.debt {
    color: var(--danger);
}

.summary-card .value.credit {
    color: var(--success);
}

.summary-card .hint {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.firm-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1rem;
}

.firm-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem;
    display: block;
    color: inherit;
    transition: border-color 0.15s, box-shadow 0.15s;
}

.firm-card:hover {
    border-color: var(--primary);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.12);
}

.firm-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}

.firm-card h2 {
    font-size: 1.05rem;
    font-weight: 600;
}

.balance {
    font-weight: 700;
    font-size: 1rem;
    white-space: nowrap;
}

.balance.debt {
    color: var(--danger);
}

.balance.credit {
    color: var(--success);
}

.balance.zero {
    color: var(--text-muted);
}

.firm-notes {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
}

.firm-card-link {
    font-size: 0.85rem;
    color: var(--primary);
}

.empty-state {
    text-align: center;
    padding: 3rem 1.5rem;
}

.empty-state p {
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.empty-text {
    color: var(--text-muted);
    padding: 1rem 0;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.55rem 1.1rem;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 500;
    border: none;
    cursor: pointer;
    transition: background 0.15s;
    text-decoration: none;
    line-height: 1.4;
}

.btn-primary {
    background: var(--primary);
    color: #fff;
}

.btn-primary:hover {
    background: var(--primary-dark);
    color: #fff;
}

.btn-success {
    background: var(--success);
    color: #fff;
}

.btn-success:hover {
    background: var(--success-dark);
    color: #fff;
}

.btn-danger {
    background: var(--danger);
    color: #fff;
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text);
}

.btn-outline:hover {
    background: var(--bg);
}

.btn-danger-outline {
    background: transparent;
    border: 1px solid #fecaca;
    color: var(--danger);
}

.btn-danger-outline:hover {
    background: #fef2f2;
}

.btn-sm {
    padding: 0.3rem 0.65rem;
    font-size: 0.8rem;
}

.btn-group {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: 0.35rem;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 0.6rem 0.75rem;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 0.95rem;
    font-family: inherit;
    background: #fff;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.form-group input:disabled {
    background: var(--bg);
    color: var(--text-muted);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.input-prefix {
    display: flex;
    align-items: center;
    border: 1px solid var(--border);
    border-radius: 8px;
    overflow: hidden;
}

.input-prefix span {
    padding: 0.6rem 0.75rem;
    background: var(--bg);
    color: var(--text-muted);
    font-size: 0.9rem;
    border-right: 1px solid var(--border);
}

.input-prefix input {
    border: none;
    border-radius: 0;
    flex: 1;
}

.input-prefix input:focus {
    box-shadow: none;
}

.hint {
    display: block;
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-top: 0.3rem;
}

.type-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.25rem;
}

.type-tab {
    padding: 0.45rem 1rem;
    border-radius: 8px;
    font-size: 0.9rem;
    color: var(--text-muted);
    border: 1px solid var(--border);
    background: var(--bg);
}

.type-tab.active {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

.filter-bar {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-bottom: 1rem;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.filter-btn {
    padding: 0.3rem 0.7rem;
    border-radius: 20px;
    border: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 0.8rem;
    background: var(--surface);
}

.filter-btn.active,
.filter-btn:hover {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

.table-responsive {
    overflow-x: auto;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.data-table th,
.data-table td {
    padding: 0.75rem 0.5rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.data-table th {
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    color: var(--text-muted);
    font-weight: 600;
}

.data-table tbody tr:hover {
    background: #fafbfc;
}

.text-right {
    text-align: right !important;
}

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

.amount-purchase {
    color: var(--danger);
    font-weight: 600;
}

.amount-payment,
.amount-refund {
    color: var(--success);
    font-weight: 600;
}

.badge {
    display: inline-block;
    padding: 0.2rem 0.55rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
}

.badge-purchase {
    background: #fef2f2;
    color: var(--danger);
}

.badge-payment {
    background: #ecfdf5;
    color: var(--success);
}

.badge-refund {
    background: #fff7ed;
    color: var(--warning);
}

.badge-refunded-inline {
    display: inline-block;
    margin-left: 0.4rem;
    padding: 0.15rem 0.45rem;
    border-radius: 20px;
    font-size: 0.7rem;
    font-weight: 600;
    background: #fff7ed;
    color: var(--warning);
    vertical-align: middle;
}

.row-refund {
    background: #fffbf5;
}

.btn-iade {
    background: transparent;
    border: 1px solid #fed7aa;
    color: var(--warning);
}

.btn-iade:hover {
    background: #fff7ed;
}

.inline-form {
    display: inline;
}

.excel-card {
    padding: 1rem 1rem 1.25rem;
}

.excel-toolbar {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.excel-date {
    margin-bottom: 0;
    min-width: 180px;
}

.excel-toolbar-right {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.excel-grid {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.excel-grid th,
.excel-grid td {
    border: 1px solid var(--border);
    padding: 0;
    vertical-align: middle;
}

.excel-grid thead th {
    background: #f8fafc;
    padding: 0.5rem 0.6rem;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    color: var(--text-muted);
    font-weight: 600;
}

.excel-grid tfoot td {
    background: #f0f9ff;
    padding: 0.6rem;
    font-weight: 700;
}

.excel-grid .col-no {
    width: 40px;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.8rem;
    background: #fafbfc;
}

.excel-grid .col-desc {
    min-width: 220px;
}

.excel-grid .col-price {
    width: 100px;
}

.excel-grid .col-qty {
    width: 70px;
}

.excel-grid .col-total {
    width: 100px;
    text-align: right;
    padding: 0.5rem 0.6rem;
    font-weight: 600;
    color: var(--danger);
    background: #fafbfc;
}

.excel-grid .col-action {
    width: 36px;
    text-align: center;
    background: #fafbfc;
}

.grid-input {
    width: 100%;
    border: none;
    padding: 0.55rem 0.6rem;
    font-size: 0.9rem;
    font-family: inherit;
    background: transparent;
    outline: none;
}

.grid-input:focus {
    background: #eff6ff;
    box-shadow: inset 0 0 0 2px var(--primary);
}

.grid-input-num {
    text-align: right;
}

.btn-row-remove {
    border: none;
    background: transparent;
    color: var(--text-muted);
    font-size: 1.2rem;
    line-height: 1;
    cursor: pointer;
    padding: 0.3rem 0.5rem;
    border-radius: 4px;
}

.btn-row-remove:hover {
    background: #fef2f2;
    color: var(--danger);
}

.excel-footer-label {
    font-weight: 600;
    color: var(--text-muted);
}

.excel-hint {
    margin-top: 0.75rem;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.excel-grid .grid-row:hover {
    background: #fafcff;
}

.entry-row {
    background: #f8fbff;
}

.entry-row .grid-input {
    width: 100%;
    border: none;
    padding: 0.5rem 0.4rem;
    font-size: 0.9rem;
    font-family: inherit;
    background: transparent;
    outline: none;
}

.entry-row .grid-input:focus {
    background: #fff;
    box-shadow: inset 0 0 0 2px var(--primary);
    border-radius: 4px;
}

.entry-row .grid-input-date {
    font-size: 0.82rem;
    padding: 0.35rem 0.3rem;
    min-width: 120px;
}

.entry-row .grid-input-num {
    text-align: right;
}

.entry-row td {
    padding: 0.25rem 0.35rem;
    vertical-align: middle;
}

.badge-muted {
    background: #e0e7ff;
    color: #4338ca;
    opacity: 0.8;
}

.entry-usd-cell {
    text-align: right;
}

.entry-usd-cell .row-total {
    display: block;
    font-size: 0.75rem;
    color: var(--danger);
    font-weight: 600;
    margin-top: 0.1rem;
}

.entry-action-cell {
    text-align: right;
    white-space: nowrap;
}

.entry-row-saving {
    background: #fef9c3 !important;
}

.entry-row-saved {
    background: #ecfdf5 !important;
    transition: background 0.4s;
}

.save-toast {
    position: fixed;
    bottom: 1.5rem;
    right: 1.5rem;
    padding: 0.6rem 1rem;
    border-radius: 8px;
    font-size: 0.85rem;
    font-weight: 500;
    opacity: 0;
    transform: translateY(10px);
    transition: opacity 0.2s, transform 0.2s;
    z-index: 200;
    pointer-events: none;
}

.save-toast.show {
    opacity: 1;
    transform: translateY(0);
}

.save-toast-success {
    background: #065f46;
    color: #fff;
}

.save-toast-error {
    background: #991b1b;
    color: #fff;
}

.actions {
    white-space: nowrap;
    display: flex;
    gap: 0.35rem;
    justify-content: flex-end;
}

.alert {
    padding: 0.85rem 1rem;
    border-radius: 8px;
    margin-bottom: 1rem;
    font-size: 0.9rem;
}

.alert-success {
    background: #ecfdf5;
    color: #065f46;
    border: 1px solid #a7f3d0;
}

.alert-error {
    background: #fef2f2;
    color: #991b1b;
    border: 1px solid #fecaca;
}

.alert-warning {
    background: #fffbeb;
    color: #92400e;
    border: 1px solid #fde68a;
}

.modal {
    position: fixed;
    inset: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

.modal.hidden {
    display: none;
}

.modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.45);
}

.modal-content {
    position: relative;
    background: var(--surface);
    border-radius: var(--radius);
    padding: 1.5rem;
    width: 100%;
    max-width: 400px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
}

.modal-content h3 {
    margin-bottom: 0.5rem;
}

.modal-content p {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

@media (max-width: 640px) {
    .form-row {
        grid-template-columns: 1fr;
    }

    .page-header {
        flex-direction: column;
    }

    .actions {
        flex-direction: column;
    }

    .data-table {
        font-size: 0.82rem;
    }
}