:root {
    --bg: #050b18;
    --panel: #091326;
    --panel-soft: #0d1b33;
    --panel-strong: #102241;
    --border: rgba(148, 163, 184, 0.18);
    --text: #eef4ff;
    --muted: #8da2c0;
    --primary: #3b82f6;
    --primary-2: #2563eb;
    --success: #16a34a;
    --danger: #ef4444;
    --warning: #f59e0b;
    --shadow: 0 24px 60px rgba(2, 8, 23, 0.35);
}

* { box-sizing: border-box; }
body {
    margin: 0;
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    background:
        radial-gradient(circle at top right, rgba(37, 99, 235, 0.22), transparent 28%),
        radial-gradient(circle at left bottom, rgba(16, 185, 129, 0.12), transparent 24%),
        var(--bg);
    color: var(--text);
}

a { color: inherit; text-decoration: none; }

.app-shell {
    min-height: 100vh;
    display: grid;
    grid-template-columns: 260px 1fr;
}

.app-shell.auth-shell {
    grid-template-columns: 1fr;
}

.sidebar {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    background: rgba(3, 8, 20, 0.88);
    border-right: 1px solid var(--border);
    padding: 24px 18px;
    position: sticky;
    top: 0;
    height: 100vh;
}

.brand, .profile-card, .auth-branding {
    display: flex;
    gap: 14px;
    align-items: center;
}

.brand span, .profile-card span, .page-subtitle, .stat-label, .empty-text, label, .helper, .table td.muted {
    color: var(--muted);
}

.brand-logo {
    width: 56px;
    height: 56px;
    object-fit: contain;
    border-radius: 16px;
    background: rgba(255, 255, 255, 0.04);
    padding: 6px;
}

.brand-mark {
    width: 42px;
    height: 42px;
    border-radius: 14px;
    display: grid;
    place-items: center;
    background: linear-gradient(135deg, var(--primary), #60a5fa);
    font-weight: 700;
}

.brand-mark.small { width: 40px; height: 40px; border-radius: 50%; }

.nav {
    margin-top: 32px;
    display: grid;
    gap: 8px;
}

.nav a {
    padding: 14px 16px;
    border-radius: 14px;
    color: #c9d6eb;
    transition: .2s ease;
}

.nav a.active, .nav a:hover {
    background: rgba(59, 130, 246, 0.18);
    color: #fff;
}

.profile-card {
    background: rgba(15, 23, 42, 0.8);
    border: 1px solid var(--border);
    border-radius: 18px;
    padding: 14px;
    flex-wrap: wrap;
}

.ghost-link {
    color: #93c5fd;
    font-size: 14px;
}

.main-content {
    padding: 32px;
}

.auth-layout {
    display: grid;
    place-items: center;
    min-height: 100vh;
    width: 100%;
    padding: 32px;
}

.auth-card, .card {
    background: rgba(9, 19, 38, 0.9);
    border: 1px solid var(--border);
    border-radius: 24px;
    box-shadow: var(--shadow);
}

.auth-card {
    width: min(100%, 460px);
    padding: 32px;
    margin: 0 auto;
}

.auth-branding {
    margin-bottom: 18px;
}

.auth-logo {
    width: 68px;
    height: 68px;
    object-fit: contain;
    border-radius: 18px;
    background: rgba(255, 255, 255, 0.04);
    padding: 8px;
}

.page-header, .actions-row, .stats-grid, .form-grid, .filters, .invoice-top {
    display: grid;
    gap: 16px;
}

.page-header {
    grid-template-columns: 1fr auto;
    align-items: start;
    margin-bottom: 24px;
}

.page-title {
    margin: 0;
    font-size: clamp(28px, 4vw, 38px);
}

.card {
    padding: 24px;
}

.stats-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    margin-bottom: 24px;
}

.stat-card {
    background: linear-gradient(180deg, rgba(12, 23, 44, 0.96), rgba(7, 15, 30, 0.96));
    border: 1px solid var(--border);
    border-radius: 22px;
    padding: 24px;
}

.stat-value {
    font-size: 34px;
    font-weight: 700;
    margin: 16px 0 8px;
}

.button, button {
    border: 0;
    border-radius: 14px;
    padding: 13px 18px;
    font-weight: 600;
    cursor: pointer;
    transition: .2s ease;
}

.button.primary, button.primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-2));
    color: white;
}

.button.secondary, button.secondary {
    background: rgba(59, 130, 246, 0.14);
    color: #dbeafe;
}

.button.danger, button.danger {
    background: rgba(239, 68, 68, 0.18);
    color: #fecaca;
}

.button:hover, button:hover { transform: translateY(-1px); }

input, textarea, select {
    width: 100%;
    background: rgba(5, 11, 24, 0.82);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 14px 15px;
    outline: none;
}

textarea { min-height: 110px; resize: vertical; }

.form-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.field { display: grid; gap: 8px; }
.field.full { grid-column: 1 / -1; }

.table-wrap {
    overflow: auto;
    border: 1px solid var(--border);
    border-radius: 20px;
}

.table {
    width: 100%;
    border-collapse: collapse;
}

.table th, .table td {
    padding: 16px;
    border-bottom: 1px solid var(--border);
    text-align: left;
}

.table th {
    background: rgba(15, 23, 42, 0.78);
    color: #dbeafe;
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: .06em;
}

.table tr:last-child td { border-bottom: 0; }

.inline-actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.alert {
    margin-bottom: 18px;
    padding: 14px 18px;
    border-radius: 16px;
    border: 1px solid var(--border);
}

.alert.success { background: rgba(22, 163, 74, 0.14); color: #bbf7d0; }
.alert.error { background: rgba(239, 68, 68, 0.14); color: #fecaca; }

.empty-state {
    text-align: center;
    padding: 54px 20px;
    border: 1px dashed var(--border);
    border-radius: 24px;
}

.filters {
    grid-template-columns: 2fr 1fr 1fr auto;
    align-items: end;
    margin-bottom: 18px;
}

.invoice-builder {
    display: grid;
    gap: 14px;
}

.invoice-row {
    display: grid;
    grid-template-columns: 2.2fr 1fr 1fr auto;
    gap: 12px;
    align-items: end;
}

.invoice-total-box {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    padding: 18px 20px;
    border-radius: 18px;
    background: rgba(59, 130, 246, 0.12);
    border: 1px solid rgba(59, 130, 246, 0.2);
}

.badge {
    display: inline-flex;
    padding: 8px 12px;
    border-radius: 999px;
    background: rgba(59, 130, 246, 0.16);
    color: #dbeafe;
    font-size: 13px;
}

.invoice-summary {
    display: grid;
    gap: 14px;
}

.summary-grid {
    display: grid;
    grid-template-columns: 1.3fr 1fr;
    gap: 18px;
}

.key-value {
    display: grid;
    gap: 10px;
}

.key-value div {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border);
}

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

@media (max-width: 1024px) {
    .stats-grid, .summary-grid, .form-grid, .filters, .invoice-row, .page-header {
        grid-template-columns: 1fr;
    }

    .app-shell { grid-template-columns: 1fr; }
    .sidebar { position: static; height: auto; }
}