/* ══════ DW FUEL PRICES — DASHBOARD STYLES ══════ */
:root {
    --primary: #1F4E79;
    --primary-light: #2E75B6;
    --accent: #C00000;
    --bg: #F5F7FA;
    --card: #FFFFFF;
    --text: #333333;
    --text-light: #666666;
    --border: #E0E4E8;
    --success: #2E7D32;
    --warning: #E65100;
    --radius: 8px;
    --shadow: 0 2px 8px rgba(0,0,0,0.08);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: 'Segoe UI', system-ui, -apple-system, sans-serif; background: var(--bg); color: var(--text); }

/* ── Navbar ── */
.navbar { background: var(--primary); color: white; padding: 0 2rem; display: flex; align-items: center; justify-content: space-between; height: 56px; position: sticky; top: 0; z-index: 100; box-shadow: 0 2px 4px rgba(0,0,0,0.15); }
.nav-brand { font-size: 1.2rem; font-weight: 700; letter-spacing: 0.5px; }
.nav-links { display: flex; gap: 0.5rem; }
.nav-links a { color: rgba(255,255,255,0.8); text-decoration: none; padding: 0.5rem 1rem; border-radius: var(--radius); font-size: 0.9rem; transition: all 0.2s; }
.nav-links a:hover, .nav-links a.active { background: rgba(255,255,255,0.15); color: white; }

/* ── Container ── */
.container { max-width: 1200px; margin: 0 auto; padding: 2rem; }
h1 { color: var(--primary); margin-bottom: 0.5rem; font-size: 1.6rem; }
.subtitle { color: var(--text-light); margin-bottom: 2rem; font-size: 0.95rem; }

/* ── KPI Cards ── */
.kpi-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 1rem; margin-bottom: 2rem; }
.kpi-card { background: var(--card); border-radius: var(--radius); padding: 1.2rem; text-align: center; box-shadow: var(--shadow); border-left: 4px solid var(--primary-light); transition: transform 0.2s; }
.kpi-card:hover { transform: translateY(-2px); }
.kpi-card.accent { border-left-color: var(--accent); }
.kpi-value { font-size: 1.8rem; font-weight: 700; color: var(--primary); }
.kpi-card.accent .kpi-value { color: var(--accent); }
.kpi-label { font-size: 0.82rem; color: var(--text-light); margin-top: 0.3rem; }

/* ── Charts ── */
.chart-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; margin-bottom: 2rem; }
.chart-card { background: var(--card); border-radius: var(--radius); padding: 1.5rem; box-shadow: var(--shadow); }
.chart-card h3 { color: var(--primary); font-size: 1rem; margin-bottom: 1rem; }
.chart-full { grid-column: 1 / -1; }

/* ── Tables ── */
.data-table { width: 100%; border-collapse: collapse; background: var(--card); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); margin-bottom: 2rem; }
.data-table th { background: var(--primary); color: white; padding: 0.8rem 1rem; text-align: left; font-size: 0.85rem; font-weight: 600; }
.data-table td { padding: 0.7rem 1rem; border-bottom: 1px solid var(--border); font-size: 0.85rem; }
.data-table tr:nth-child(even) { background: #F8F9FA; }
.data-table tr:hover { background: #EDF2F7; }

/* ── Filters ── */
.filters { display: flex; gap: 1rem; margin-bottom: 1.5rem; flex-wrap: wrap; align-items: center; }
.filters select, .filters input { padding: 0.5rem 1rem; border: 1px solid var(--border); border-radius: var(--radius); font-size: 0.9rem; background: white; }
.filters label { font-weight: 600; font-size: 0.85rem; color: var(--text-light); }

/* ── Buttons ── */
.btn { padding: 0.6rem 1.5rem; border: none; border-radius: var(--radius); font-size: 0.95rem; cursor: pointer; transition: all 0.2s; }
.btn-primary { background: var(--primary); color: white; }
.btn-primary:hover { background: var(--primary-light); }

/* ── Login ── */
.login-body { display: flex; justify-content: center; align-items: center; min-height: 100vh; background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%); }
.login-container { background: white; border-radius: 12px; padding: 2.5rem; width: 100%; max-width: 400px; box-shadow: 0 8px 32px rgba(0,0,0,0.2); }
.login-header { text-align: center; margin-bottom: 2rem; }
.login-header h1 { color: var(--primary); font-size: 1.5rem; }
.login-header p { color: var(--text-light); font-size: 0.9rem; }
.login-form .form-group { margin-bottom: 1.2rem; }
.login-form label { display: block; margin-bottom: 0.4rem; font-weight: 600; font-size: 0.85rem; color: var(--text-light); }
.login-form input { width: 100%; padding: 0.7rem 1rem; border: 1px solid var(--border); border-radius: var(--radius); font-size: 1rem; }
.login-form .btn { width: 100%; padding: 0.8rem; font-size: 1rem; }
.alert { padding: 0.8rem 1rem; border-radius: var(--radius); margin-bottom: 1rem; font-size: 0.9rem; }
.alert-error { background: #FDECEA; color: #C62828; border: 1px solid #F5C6CB; }

/* ── Responsive ── */
@media (max-width: 768px) {
    .chart-row { grid-template-columns: 1fr; }
    .kpi-grid { grid-template-columns: repeat(2, 1fr); }
    .navbar { flex-direction: column; height: auto; padding: 0.8rem; }
    .nav-links { flex-wrap: wrap; justify-content: center; }
    .filters { flex-direction: column; }
}