/* ── Reset & base ──────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
    --sidebar-w:    240px;
    --navy:         #1e2a3b;
    --navy-light:   #253448;
    --navy-border:  #2e3f56;
    --accent:       #3b82f6;
    --accent-dark:  #2563eb;
    --text:         #1f2937;
    --text-muted:   #6b7280;
    --bg:           #f3f4f6;
    --card-bg:      #ffffff;
    --border:       #e5e7eb;
    --success:      #10b981;
    --danger:       #ef4444;
    --warning:      #f59e0b;
    --radius:       8px;
    --shadow:       0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.06);
    --shadow-md:    0 4px 6px rgba(0,0,0,.07), 0 2px 4px rgba(0,0,0,.06);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 14px;
    color: var(--text);
    background: var(--bg);
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── Layout ─────────────────────────────────────────────────────── */
.layout {
    display: flex;
    min-height: 100vh;
}

/* ── Sidebar ─────────────────────────────────────────────────────── */
.sidebar {
    width: var(--sidebar-w);
    background: var(--navy);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    z-index: 100;
}

.sidebar-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 20px 18px;
    border-bottom: 1px solid var(--navy-border);
    color: #fff;
    font-size: 16px;
    font-weight: 700;
    letter-spacing: .5px;
}

.brand-icon {
    color: var(--accent);
    font-size: 18px;
}

.sidebar-nav {
    flex: 1;
    padding: 12px 0;
    overflow-y: auto;
}

.nav-section {
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 1px;
    text-transform: uppercase;
    color: #64748b;
    padding: 14px 18px 6px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 9px 18px;
    color: #94a3b8;
    font-size: 13.5px;
    transition: background .15s, color .15s;
    border-left: 3px solid transparent;
}

.nav-item:hover,
.nav-item.active {
    background: var(--navy-light);
    color: #fff;
    text-decoration: none;
    border-left-color: var(--accent);
}

.nav-icon { font-size: 15px; }

.sidebar-footer {
    padding: 16px 18px;
    border-top: 1px solid var(--navy-border);
}

.user-info { margin-bottom: 10px; }
.user-name { color: #e2e8f0; font-weight: 600; font-size: 13px; }
.user-role {
    color: #64748b;
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: .5px;
}

.btn-logout {
    display: block;
    width: 100%;
    padding: 7px 12px;
    background: rgba(255,255,255,.06);
    color: #94a3b8;
    border-radius: var(--radius);
    font-size: 13px;
    text-align: center;
    transition: background .15s;
}
.btn-logout:hover {
    background: rgba(239,68,68,.15);
    color: #fca5a5;
    text-decoration: none;
}

/* ── Main content ─────────────────────────────────────────────── */
.main-content {
    margin-left: var(--sidebar-w);
    flex: 1;
    min-height: 100vh;
}

.page-inner {
    padding: 28px 32px;
    max-width: 1200px;
}

.main-content.full-width .page-inner {
    max-width: none;
}

/* ── Page header ─────────────────────────────────────────────── */
.page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
}

.page-title {
    font-size: 22px;
    font-weight: 700;
    color: var(--text);
}

.page-subtitle {
    color: var(--text-muted);
    font-size: 13px;
    margin-top: 3px;
}

/* ── Cards ───────────────────────────────────────────────────── */
.card {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    margin-bottom: 20px;
}

.card-header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border);
    font-weight: 600;
    font-size: 14px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.card-body {
    padding: 20px;
}

/* ── KPI cards ───────────────────────────────────────────────── */
.kpi-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.kpi-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    padding: 18px 20px;
}

.kpi-label {
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: .6px;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.kpi-value {
    font-size: 26px;
    font-weight: 700;
    color: var(--text);
    line-height: 1;
}

.kpi-trend {
    font-size: 12px;
    margin-top: 6px;
}

.kpi-trend.up   { color: var(--success); }
.kpi-trend.down { color: var(--danger); }

/* ── Chart grid ──────────────────────────────────────────────── */
.chart-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 24px;
}

.chart-wrap {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    padding: 20px;
}

.chart-title {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 14px;
    text-transform: uppercase;
    letter-spacing: .5px;
}

.chart-wrap canvas { max-width: 100%; }

/* ── Tables ──────────────────────────────────────────────────── */
.table-wrap { overflow-x: auto; }

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13.5px;
}

thead th {
    text-align: left;
    padding: 10px 14px;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .6px;
    color: var(--text-muted);
    border-bottom: 2px solid var(--border);
    background: #fafafa;
}

tbody td {
    padding: 11px 14px;
    border-bottom: 1px solid var(--border);
    vertical-align: middle;
}

tbody tr:last-child td { border-bottom: none; }
tbody tr:hover td { background: #f9fafb; }

/* ── Dataset list ────────────────────────────────────────────── */
.dataset-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 16px;
}

.dataset-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 20px;
    transition: box-shadow .2s, border-color .2s;
}

.dataset-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--accent);
    text-decoration: none;
}

.dataset-card-title {
    font-weight: 600;
    font-size: 15px;
    color: var(--text);
    margin-bottom: 6px;
}

.dataset-card-desc {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 12px;
    line-height: 1.5;
}

.dataset-card-meta {
    font-size: 11px;
    color: #9ca3af;
    text-transform: uppercase;
    letter-spacing: .5px;
}

/* ── Forms ───────────────────────────────────────────────────── */
.form-group { margin-bottom: 16px; }

label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 6px;
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="date"],
input[type="number"],
select,
textarea {
    display: block;
    width: 100%;
    padding: 9px 12px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 14px;
    color: var(--text);
    background: #fff;
    transition: border-color .15s, box-shadow .15s;
    font-family: inherit;
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(59,130,246,.15);
}

textarea { min-height: 80px; resize: vertical; }

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

/* ── Buttons ─────────────────────────────────────────────────── */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 9px 16px;
    border-radius: 6px;
    font-size: 13.5px;
    font-weight: 600;
    cursor: pointer;
    border: 1px solid transparent;
    transition: background .15s, box-shadow .15s;
    text-decoration: none;
    font-family: inherit;
}

.btn-primary {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}
.btn-primary:hover { background: var(--accent-dark); text-decoration: none; color: #fff; }

.btn-secondary {
    background: #fff;
    color: var(--text);
    border-color: var(--border);
}
.btn-secondary:hover { background: #f9fafb; text-decoration: none; }

.btn-danger {
    background: var(--danger);
    color: #fff;
    border-color: var(--danger);
}
.btn-danger:hover { background: #dc2626; text-decoration: none; color: #fff; }

.btn-sm {
    padding: 5px 10px;
    font-size: 12px;
}

/* ── Alerts ──────────────────────────────────────────────────── */
.alert {
    padding: 12px 16px;
    border-radius: var(--radius);
    margin-bottom: 20px;
    font-size: 13.5px;
    border: 1px solid transparent;
}

.alert-success { background: #ecfdf5; color: #065f46; border-color: #a7f3d0; }
.alert-error   { background: #fef2f2; color: #991b1b; border-color: #fecaca; }
.alert-info    { background: #eff6ff; color: #1e40af; border-color: #bfdbfe; }

/* ── Login page ──────────────────────────────────────────────── */
.login-page {
    min-height: 100vh;
    background: linear-gradient(135deg, var(--navy) 0%, #2d3e55 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
}

.login-box {
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 20px 40px rgba(0,0,0,.25);
    padding: 40px 36px;
    width: 100%;
    max-width: 400px;
}

.login-logo {
    text-align: center;
    margin-bottom: 28px;
}

.login-logo-icon {
    font-size: 32px;
    color: var(--accent);
    display: block;
    margin-bottom: 8px;
}

.login-logo-name {
    font-size: 20px;
    font-weight: 800;
    color: var(--navy);
    letter-spacing: .5px;
}

.login-logo-tagline {
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 2px;
}

.login-title {
    font-size: 17px;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--text);
}

/* ── Badges ──────────────────────────────────────────────────── */
.badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 20px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: .4px;
}

.badge-admin  { background: #ede9fe; color: #5b21b6; }
.badge-client { background: #dbeafe; color: #1e40af; }

/* ── Utilities ───────────────────────────────────────────────── */
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.text-muted { color: var(--text-muted); }
.text-right { text-align: right; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.gap-2 { gap: 8px; }
.d-flex { display: flex; align-items: center; }
.empty-state { text-align: center; padding: 40px 20px; color: var(--text-muted); }

@media (max-width: 768px) {
    .chart-grid { grid-template-columns: 1fr; }
    .form-row   { grid-template-columns: 1fr; }
    .page-inner { padding: 16px; }
}