:root {
    --bg: #f5f6fa;
    --surface: #ffffff;
    --border: #e2e5ed;
    --border-hover: #c5c9d6;
    --text: #1e2a3a;
    --text-muted: #64748b;
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --primary-light: #eff6ff;
    --success: #16a34a;
    --success-bg: #f0fdf4;
    --success-border: #bbf7d0;
    --danger: #dc2626;
    --danger-bg: #fef2f2;
    --danger-border: #fecaca;
    --warning-bg: #fffbeb;
    --warning-border: #fde68a;
    --nav-bg: #1e293b;
    --nav-text: #cbd5e1;
    --nav-active: #3b82f6;
    --radius: 8px;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
}

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

html { font-size: 15px; }
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
}

.app-layout {
    display: grid;
    grid-template-columns: 220px 1fr;
    min-height: 100vh;
}

/* ── Sidebar ── */
.sidebar {
    background: var(--nav-bg);
    color: var(--nav-text);
    padding: 1.5rem 0;
    position: sticky;
    top: 0;
    height: 100vh;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
}
.sidebar-brand {
    padding: 0 1.25rem 1.25rem;
    border-bottom: 1px solid rgba(255,255,255,0.08);
    margin-bottom: 0.75rem;
}
.sidebar-brand h2 {
    font-size: 1.1rem;
    color: #fff;
    font-weight: 700;
    letter-spacing: -0.02em;
}
.sidebar-brand small {
    font-size: 0.75rem;
    color: var(--nav-text);
    opacity: 0.7;
}
.sidebar-nav { flex: 1; }
.sidebar-nav a {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.6rem 1.25rem;
    color: var(--nav-text);
    text-decoration: none;
    font-size: 0.9rem;
    transition: background 0.15s, color 0.15s;
    border-left: 3px solid transparent;
}
.sidebar-nav a:hover {
    background: rgba(255,255,255,0.06);
    color: #fff;
}
.sidebar-nav a.active {
    background: rgba(59,130,246,0.12);
    color: #fff;
    border-left-color: var(--nav-active);
    font-weight: 600;
}
.sidebar-nav .nav-section {
    padding: 0.8rem 1.25rem 0.3rem;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: rgba(255,255,255,0.35);
    font-weight: 600;
}
.sidebar-footer {
    padding: 0.75rem 1.25rem;
    border-top: 1px solid rgba(255,255,255,0.08);
    margin-top: auto;
}
.sidebar-footer .user-email {
    font-size: 0.78rem;
    color: var(--nav-text);
    opacity: 0.7;
    display: block;
    margin-bottom: 0.4rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.sidebar-footer button {
    background: none;
    border: 1px solid rgba(255,255,255,0.15);
    color: var(--nav-text);
    padding: 0.35rem 0.7rem;
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 0.8rem;
    width: 100%;
    transition: background 0.15s, color 0.15s;
}
.sidebar-footer button:hover {
    background: rgba(255,255,255,0.1);
    color: #fff;
}

/* ── Main content ── */
.main-content {
    padding: 2rem 2.5rem;
    max-width: 1200px;
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 0.75rem;
}
.page-header h1 {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}
.page-header-actions {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    flex-wrap: wrap;
}
.muted {
    color: var(--text-muted);
    font-size: 0.88rem;
}

/* ── Cards ── */
.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}
.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border);
}
.card-header h3 {
    font-size: 1rem;
    font-weight: 600;
}

/* ── Alerts ── */
.alert {
    padding: 0.75rem 1rem;
    border-radius: var(--radius);
    margin-bottom: 1rem;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.alert-error {
    background: var(--danger-bg);
    border: 1px solid var(--danger-border);
    color: var(--danger);
}
.alert-success {
    background: var(--success-bg);
    border: 1px solid var(--success-border);
    color: var(--success);
}

/* ── Buttons ── */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.5rem 1rem;
    border-radius: var(--radius);
    font-size: 0.85rem;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text);
    transition: all 0.15s;
    line-height: 1.4;
}
.btn:hover {
    border-color: var(--border-hover);
    box-shadow: var(--shadow-sm);
}
.btn-primary {
    background: var(--primary);
    border-color: var(--primary);
    color: #fff;
}
.btn-primary:hover {
    background: var(--primary-hover);
    border-color: var(--primary-hover);
}
.btn-danger {
    color: var(--danger);
    border-color: var(--danger-border);
}
.btn-danger:hover {
    background: var(--danger-bg);
}
.btn-sm {
    padding: 0.3rem 0.6rem;
    font-size: 0.8rem;
}

/* ── Forms ── */
.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem 1.25rem;
}
.form-group {
    display: flex;
    flex-direction: column;
}
.form-group.full { grid-column: 1 / -1; }
.form-group label {
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 0.3rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}
.form-group input,
.form-group textarea,
.form-group select {
    padding: 0.55rem 0.75rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 0.9rem;
    font-family: inherit;
    color: var(--text);
    background: var(--surface);
    transition: border-color 0.15s, box-shadow 0.15s;
}
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(59,130,246,0.12);
}
.form-group textarea { min-height: 90px; resize: vertical; }
.form-actions {
    margin-top: 1.25rem;
    display: flex;
    gap: 0.5rem;
}

.filters-form {
    margin-bottom: 1.25rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border);
}

/* ── Tables ── */
.table-wrap {
    overflow-x: auto;
}
table {
    width: 100%;
    border-collapse: collapse;
}
thead th {
    text-align: left;
    padding: 0.6rem 0.75rem;
    font-size: 0.78rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--text-muted);
    border-bottom: 2px solid var(--border);
    white-space: nowrap;
}
tbody td {
    padding: 0.65rem 0.75rem;
    border-bottom: 1px solid var(--border);
    font-size: 0.88rem;
    vertical-align: middle;
}
tbody tr:hover { background: var(--primary-light); }
tbody tr:last-child td { border-bottom: none; }
.table-empty td {
    text-align: center;
    color: var(--text-muted);
    padding: 2rem 0.75rem;
}
.td-actions {
    display: flex;
    gap: 0.35rem;
    align-items: center;
}

/* ── Badges ── */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.2rem 0.55rem;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.02em;
}
.badge-active { background: var(--success-bg); color: var(--success); border: 1px solid var(--success-border); }
.badge-inactive, .badge-suspended, .badge-cancelled, .badge-terminated { background: #f1f5f9; color: #64748b; border: 1px solid #e2e8f0; }
.badge-draft { background: var(--warning-bg); color: #92400e; border: 1px solid var(--warning-border); }
.badge-unpaid { background: #fef2f2; color: #dc2626; border: 1px solid #fecaca; }
.badge-paid, .badge-issued { background: var(--success-bg); color: var(--success); border: 1px solid var(--success-border); }
.badge-converted { background: #eff6ff; color: #2563eb; border: 1px solid #bfdbfe; }
.badge-refunded { background: #faf5ff; color: #7c3aed; border: 1px solid #e9d5ff; }

/* ── Cols layout ── */
.cols-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; }

/* ── Dashboard ── */
.kpi-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1rem;
    margin-bottom: 1.25rem;
}
.kpi-grid-sm {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}
.kpi-card {
    position: relative;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.1rem 1.2rem;
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.kpi-card:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(15, 23, 42, 0.06);
}
.kpi-card::before {
    content: "";
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: linear-gradient(90deg, #cbd5e1, #e2e8f0);
}
.kpi-card.kpi-primary::before { background: linear-gradient(90deg, #3b82f6, #60a5fa); }
.kpi-card.kpi-success::before { background: linear-gradient(90deg, #16a34a, #4ade80); }
.kpi-card.kpi-warning::before { background: linear-gradient(90deg, #f59e0b, #fbbf24); }
.kpi-card.kpi-info::before    { background: linear-gradient(90deg, #8b5cf6, #c084fc); }

.kpi-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 0.5rem;
}
.kpi-icon {
    font-size: 1.1rem;
    opacity: 0.85;
    line-height: 1;
}
.kpi-label {
    color: var(--text-muted);
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    font-weight: 600;
}
.kpi-value {
    margin-top: 0.4rem;
    font-size: 1.55rem;
    font-weight: 700;
    color: var(--text);
    letter-spacing: -0.02em;
    line-height: 1.2;
}
.kpi-value-sm {
    margin-top: 0.35rem;
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text);
    letter-spacing: -0.02em;
}
.kpi-foot {
    margin-top: 0.6rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.78rem;
}
.kpi-foot .muted { font-size: 0.78rem; }

.trend {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.15rem 0.5rem;
    border-radius: 999px;
    font-size: 0.72rem;
    font-weight: 600;
    line-height: 1;
}
.trend-up      { background: #ecfdf5; color: #047857; border: 1px solid #a7f3d0; }
.trend-down    { background: #fef2f2; color: #b91c1c; border: 1px solid #fecaca; }
.trend-neutral { background: #f1f5f9; color: #475569; border: 1px solid #e2e8f0; }

/* Chart (line/area) */
.chart-legend {
    display: flex;
    gap: 1rem;
    color: var(--text-muted);
    font-size: 0.82rem;
}
.dot {
    width: 10px;
    height: 10px;
    border-radius: 999px;
    display: inline-block;
    margin-right: 0.35rem;
    vertical-align: middle;
}
.dot-invoiced { background: #3b82f6; }
.dot-paid { background: #16a34a; }
.chart-wrap {
    width: 100%;
    overflow-x: auto;
}
.chart-svg {
    width: 100%;
    height: auto;
    display: block;
}

/* Donut chart */
.donut-wrap {
    display: grid;
    grid-template-columns: 220px 1fr;
    gap: 1.25rem;
    align-items: center;
}
.donut-svg { width: 220px; height: 220px; }
.donut-legend {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}
.legend-row {
    display: grid;
    grid-template-columns: 14px 1fr auto;
    align-items: center;
    gap: 0.6rem;
    padding: 0.35rem 0.5rem;
    border-radius: 6px;
}
.legend-row:hover { background: #f8fafc; }
.legend-color {
    width: 12px;
    height: 12px;
    border-radius: 3px;
    display: inline-block;
}
.legend-label {
    font-size: 0.88rem;
    color: var(--text);
    text-transform: capitalize;
}
.legend-value {
    font-weight: 700;
    color: var(--text);
}

/* Aging buckets */
.aging-list {
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
}
.aging-row-top {
    display: flex;
    justify-content: space-between;
    font-size: 0.88rem;
    margin-bottom: 0.3rem;
}
.aging-bar-track {
    background: #f1f5f9;
    border-radius: 999px;
    height: 8px;
    overflow: hidden;
}
.aging-bar-fill {
    height: 100%;
    border-radius: 999px;
    transition: width 0.4s ease;
}

/* Top clients */
.top-clients {
    display: flex;
    flex-direction: column;
    gap: 0.9rem;
}
.top-client-top {
    display: flex;
    justify-content: space-between;
    gap: 0.5rem;
    font-size: 0.9rem;
    margin-bottom: 0.3rem;
}
.top-client-name {
    font-weight: 600;
    color: var(--text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 75%;
}
.top-client-amount { font-weight: 700; color: var(--text); }
.top-client-track {
    background: #eef2f7;
    height: 6px;
    border-radius: 999px;
    overflow: hidden;
}
.top-client-fill {
    height: 100%;
    background: linear-gradient(90deg, #3b82f6, #8b5cf6);
    border-radius: 999px;
}
.top-client-meta {
    font-size: 0.75rem;
    margin-top: 0.25rem;
}

/* Renewals list */
.renewals-list {
    display: flex;
    flex-direction: column;
    gap: 0.55rem;
}
.renewal-row {
    display: flex;
    justify-content: space-between;
    gap: 0.75rem;
    padding: 0.65rem 0.75rem;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: #fbfcfe;
}
.renewal-row:hover { background: #f5f8fc; border-color: var(--border-hover); }
.renewal-title { font-weight: 600; font-size: 0.9rem; }
.renewal-meta { text-align: right; }
.renewal-price { font-weight: 700; font-size: 0.95rem; color: var(--text); }
.small { font-size: 0.75rem; }

/* Year picker */
.year-picker {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 0.25rem 0.65rem;
    box-shadow: var(--shadow-sm);
}
.year-picker label { font-weight: 600; }
.year-picker select {
    border: none;
    background: transparent;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text);
    padding: 0.25rem 0.25rem 0.25rem 0;
    cursor: pointer;
    outline: none;
}

/* Grid utility for dashboard */
.dashboard-grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-bottom: 0;
}
.dashboard-grid-2 > .card { margin-bottom: 1.5rem; }

/* ── Totals ── */
.totals-box {
    margin-left: auto;
    max-width: 320px;
    margin-top: 1rem;
}
.totals-box table { width: 100%; }
.totals-box td { padding: 0.35rem 0.5rem; border: none; font-size: 0.9rem; }
.totals-box tr:last-child td { font-weight: 700; font-size: 1rem; }

/* ── Inline form ── */
form.inline { display: inline; }

/* ── Login page ── */
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg);
}
.login-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    box-shadow: var(--shadow);
    padding: 2.5rem;
    width: 100%;
    max-width: 420px;
}
.login-card h1 {
    font-size: 1.4rem;
    margin-bottom: 0.25rem;
    font-weight: 700;
}
.login-card .subtitle {
    color: var(--text-muted);
    font-size: 0.88rem;
    margin-bottom: 1.5rem;
}

/* ── Responsive ── */
@media (max-width: 768px) {
    .app-layout { grid-template-columns: 1fr; }
    .sidebar {
        position: fixed;
        left: -260px;
        width: 260px;
        z-index: 999;
        transition: left 0.3s;
    }
    .sidebar.open { left: 0; }
    .main-content { padding: 1.25rem; }
    .form-grid { grid-template-columns: 1fr; }
    .cols-2 { grid-template-columns: 1fr; }
    .dashboard-grid-2 { grid-template-columns: 1fr; }
    .donut-wrap { grid-template-columns: 1fr; justify-items: center; }
}