:root {
    --color-success: #059669;
    --color-success-bg: #d1fae5;
    --color-success-text: #065f46;
    --color-warning: #b45309;
    --color-warning-bg: #fef3c7;
    --color-warning-text: #92400e;
    --color-danger: #b91c1c;
    --color-danger-bg: #fee2e2;
    --color-danger-text: #991b1b;
    --color-info: #0369a1;
    --color-info-bg: #e0f2fe;
    --color-info-text: #075985;
    --color-primary: #2563eb;
    --color-primary-hover: #1d4ed8;
    --gray-900: #1a1a1a;
    --gray-700: #374151;
    --gray-600: #555;
    --gray-500: #6b7280;
    --gray-300: #ccc;
    --gray-200: #e5e7eb;
    --gray-100: #f4f5f7;
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 20px;
    --space-6: 24px;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }

.skip-link {
    position: absolute;
    top: -50px;
    left: 8px;
    background: var(--color-primary);
    color: #fff;
    padding: 10px 16px;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
    z-index: 1000;
    transition: top 0.15s;
}
.skip-link:focus { top: 8px; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
    margin: 0;
    background: var(--gray-100);
    color: var(--gray-900);
    -webkit-font-smoothing: antialiased;
}

/* ---------- Nav ---------- */
.topnav {
    background: #1f2937;
    position: sticky;
    top: 0;
    z-index: 100;
}
.topnav-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
}
.topnav .brand {
    color: #fff;
    font-weight: 700;
    font-size: 16px;
}
.nav-toggle {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 4px;
    width: 36px;
    height: 36px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 6px;
}
.nav-toggle span {
    display: block;
    height: 2px;
    width: 100%;
    background: #fff;
    border-radius: 2px;
}
.nav-links {
    display: none;
    flex-direction: column;
    padding: 4px 16px 12px;
    gap: 2px;
    max-height: calc(100vh - 60px);
    overflow-y: auto;
}
.nav-links.open { display: flex; }
.nav-links a {
    color: #cbd5e1;
    text-decoration: none;
    font-size: 15px;
    padding: 10px 8px;
    border-radius: 6px;
}
.nav-links a:hover, .nav-links a.active { background: #374151; color: #fff; }
.nav-links a.logout { border-top: 1px solid #374151; margin-top: 6px; padding-top: 12px; }

@media (min-width: 860px) {
    .nav-toggle { display: none; }
    .topnav-bar { padding: 14px 24px; }
    .nav-links {
        display: flex !important;
        flex-direction: row;
        flex-wrap: wrap;
        align-items: center;
        padding: 0 24px 14px;
        gap: 4px;
        max-height: none;
        overflow-y: visible;
    }
    .nav-links a { font-size: 14px; padding: 6px 10px; }
    .nav-links a.logout { border-top: none; margin-top: 0; margin-left: auto; padding-top: 6px; }
}

/* ---------- Layout ---------- */
.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 16px;
}
@media (min-width: 640px) {
    .container { padding: 24px; }
}

.card {
    background: #fff;
    border-radius: 10px;
    padding: 16px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    margin-bottom: 16px;
}
@media (min-width: 640px) {
    .card { padding: 20px; }
}
.card > h2:first-child { margin-top: 0; }

.card-narrow { max-width: 480px; }
.card-login { width: 100%; max-width: 320px; }

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 14px;
}
.card-header h2 { margin: 0; }
.header-actions { display: flex; gap: 8px; flex-wrap: wrap; }

.help-text {
    font-size: 13px;
    color: var(--gray-500);
}

.login-wrap {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 16px;
}

/* ---------- Forms ---------- */
form.stacked label {
    display: block;
    font-size: 13px;
    color: #555;
    margin-bottom: 4px;
    margin-top: 14px;
}
form.stacked input, form.stacked select {
    width: 100%;
    padding: 12px 12px;
    border: 1px solid #ccc;
    border-radius: 8px;
    font-size: 16px;
    background: #fff;
}
form.stacked input:focus, form.stacked select:focus {
    outline: none;
    border-color: #2563eb;
    box-shadow: 0 0 0 3px rgba(37,99,235,0.15);
}
form.stacked button:not(.btn) {
    margin-top: 20px;
    padding: 12px 20px;
    background: var(--color-primary);
    color: #fff;
    border: none;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    width: 100%;
}
@media (min-width: 640px) {
    form.stacked button:not(.btn) { width: auto; }
}
form.stacked button:not(.btn):hover { background: var(--color-primary-hover); }
form.stacked button:not(.btn):disabled { background: #93c5fd; cursor: not-allowed; }
.error { color: var(--color-danger); font-size: 13px; margin-top: 10px; }
@media (min-width: 480px) {
    form.stacked .field-row { display: flex; gap: 16px; }
    form.stacked .field-row > div { flex: 1; min-width: 0; }
}

.filter-form {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-top: 12px;
}
.filter-form input, .filter-form select {
    padding: 9px 12px;
    border: 1px solid var(--gray-300);
    border-radius: 8px;
    font-size: 14px;
    background: #fff;
}
.filter-form input[type="text"] { flex: 1; min-width: 160px; }
.filter-form input:focus, .filter-form select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37,99,235,0.15);
}
.flash {
    background: var(--color-success-bg);
    color: var(--color-success-text);
    padding: 10px 14px;
    border-radius: 8px;
    margin-bottom: 16px;
    font-size: 14px;
}

/* ---------- Buttons ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 9px 16px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
    border: 1px solid transparent;
    cursor: pointer;
    line-height: 1.3;
    min-height: 40px;
}
.btn-primary { background: var(--color-primary); color: #fff; }
.btn-primary:hover { background: var(--color-primary-hover); }
.btn-secondary { background: #fff; color: var(--gray-700); border-color: var(--gray-300); }
.btn-secondary:hover { background: var(--gray-100); border-color: #bbb; }
.btn-danger { background: var(--color-danger-bg); color: var(--color-danger-text); }
.btn-danger:hover { background: #fecaca; }
.btn-sm { padding: 6px 10px; font-size: 13px; min-height: 32px; }
.btn:disabled { opacity: 0.6; cursor: not-allowed; }

/* ---------- Badges ---------- */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 3px 9px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 600;
    text-transform: capitalize;
    white-space: nowrap;
}
.badge-success, .badge-paid { background: var(--color-success-bg); color: var(--color-success-text); }
.badge-warning, .badge-unpaid { background: var(--color-warning-bg); color: var(--color-warning-text); }
.badge-partial { background: var(--color-info-bg); color: var(--color-info-text); }
.badge-danger, .badge-overdue { background: var(--color-danger-bg); color: var(--color-danger-text); }
.badge-neutral { background: var(--gray-200); color: var(--gray-700); }

/* ---------- Tables ---------- */
.table-scroll {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    border-radius: 10px;
    background: #fff;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    margin-bottom: 20px;
}
table {
    width: 100%;
    border-collapse: collapse;
    background: #fff;
    border-radius: 10px;
    min-width: 640px;
}
th, td {
    text-align: left;
    padding: 10px 12px;
    border-bottom: 1px solid #eee;
    font-size: 14px;
    white-space: nowrap;
}
th { background: #f9fafb; color: var(--gray-600); font-weight: 600; }
tr.row-attention { background: #fff7ed; }
.actions { display: flex; gap: 4px; flex-wrap: nowrap; }
.actions a, .actions button.btn-sm { margin-right: 0; }
.pnl-positive { color: var(--color-success-text); font-weight: 600; }
.pnl-negative { color: var(--color-danger); font-weight: 600; }
.cell-truncate { max-width: 260px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.empty-row { text-align: center !important; white-space: normal !important; padding: 36px 16px !important; color: var(--gray-500); }
.empty-row .btn { margin-top: 10px; }

/* ---------- Responsive card table (dense import previews) ---------- */
@media (max-width: 700px) {
    table.table-cards { min-width: 0; }
    .table-cards thead { display: none; }
    .table-cards, .table-cards tbody, .table-cards tr, .table-cards td {
        display: block;
        width: 100%;
    }
    .table-cards tr {
        border: 1px solid var(--gray-200);
        border-radius: 10px;
        margin: 0 0 12px;
        padding: 12px;
    }
    .table-cards tr:last-child { margin-bottom: 0; }
    .table-cards td {
        border-bottom: none;
        padding: 6px 0;
        white-space: normal;
    }
    .table-cards td[data-label]::before {
        content: attr(data-label);
        display: block;
        font-size: 11px;
        font-weight: 600;
        color: var(--gray-500);
        text-transform: uppercase;
        letter-spacing: 0.02em;
        margin-bottom: 3px;
    }
    .table-cards td input, .table-cards td select {
        width: 100%;
    }
    .table-cards .link-combo, .table-cards .link-single { width: 100%; }
}

/* ---------- Icons ---------- */
.icon { width: 16px; height: 16px; flex-shrink: 0; vertical-align: middle; }
.icon-success { color: var(--color-success); }
.icon-warning { color: var(--color-warning); }
.icon-danger { color: var(--color-danger); }

/* ---------- Dashboard ---------- */
.summary-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    margin-bottom: 20px;
}
@media (min-width: 640px) {
    .summary-grid { grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 14px; }
    .summary-grid .stat { max-width: 260px; }
}
.summary-grid .stat {
    background: #fff;
    border-radius: 10px;
    padding: 14px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}
.summary-grid .stat .label { font-size: 12px; color: var(--gray-600); }
.summary-grid .stat .value { font-size: 18px; font-weight: 700; margin-top: 4px; }
.summary-grid .stat .value.stat-warning { font-size: 13px; font-weight: 600; color: var(--color-warning); }
@media (min-width: 640px) {
    .summary-grid .stat .value { font-size: 20px; }
}

/* ---------- Segmented control (e.g. single/combined payment toggle) ---------- */
.segmented {
    display: inline-flex;
    background: var(--gray-100);
    border-radius: 8px;
    padding: 3px;
    gap: 2px;
    margin-bottom: 14px;
}
.segmented a, .segmented span {
    display: inline-block;
    padding: 7px 14px;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 600;
    color: var(--gray-600);
    text-decoration: none;
}
.segmented .active { background: #fff; color: var(--gray-900); box-shadow: 0 1px 2px rgba(0,0,0,0.1); }

.toast {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: #1f2937;
    color: #fff;
    padding: 10px 18px;
    border-radius: 8px;
    font-size: 14px;
    opacity: 0;
    transition: opacity 0.3s;
    pointer-events: none;
    white-space: nowrap;
}
.toast.show { opacity: 1; }
@media (min-width: 640px) {
    .toast { left: auto; right: 20px; transform: none; }
}

h2 { font-size: 19px; }
@media (min-width: 640px) {
    h2 { font-size: 22px; }
}