/* -------------------------------------------------------------------------
   Smart Grid AI — Dark-mode, responsive dashboard
   ------------------------------------------------------------------------- */

:root {
    --bg: #0b1220;
    --bg-2: #111a2e;
    --card: #16233d;
    --card-2: #1d2d4d;
    --text: #e6edf7;
    --muted: #8b9bb8;
    --accent: #4cc9f0;
    --accent-2: #7209b7;
    --success: #2ecc71;
    --warn: #f39c12;
    --danger: #e74c3c;
    --border: #24324f;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
    --radius: 14px;
    --font: "Segoe UI", "Inter", system-ui, -apple-system, sans-serif;
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    background: radial-gradient(1200px 600px at 20% 0%, #142344 0%, var(--bg) 60%);
    color: var(--text);
    font-family: var(--font);
    min-height: 100vh;
}

/* ---------- Top bar ---------- */
.topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 18px 28px;
    border-bottom: 1px solid var(--border);
    backdrop-filter: blur(6px);
    background: rgba(11, 18, 32, 0.75);
    position: sticky;
    top: 0;
    z-index: 10;
}

.brand {
    display: flex;
    align-items: center;
    gap: 14px;
    flex-wrap: wrap;
}

.brand .logo {
    font-size: 26px;
    color: var(--accent);
    filter: drop-shadow(0 0 6px var(--accent));
}

.brand h1 {
    font-size: 20px;
    margin: 0;
    letter-spacing: 0.3px;
}

.brand .tag {
    color: var(--muted);
    font-size: 12px;
}

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

.btn {
    border: 1px solid var(--border);
    background: var(--card);
    color: var(--text);
    padding: 9px 14px;
    border-radius: 10px;
    cursor: pointer;
    font-size: 13px;
    font-weight: 500;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    transition: all 0.15s ease;
}

.btn:hover {
    background: var(--card-2);
    border-color: var(--accent);
}

.btn.primary {
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    border: none;
    color: #fff;
    font-weight: 600;
}

.btn.primary:hover { filter: brightness(1.1); }

/* ---------- Layout ---------- */
.grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 18px;
    padding: 24px 28px;
}

.card {
    background: linear-gradient(180deg, var(--card), var(--card-2));
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 18px;
    box-shadow: var(--shadow);
}

.card.wide { grid-column: span 2; }

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 12px;
}

.chart-container {
    position: relative;
    height: 320px;
    width: 100%;
}

.card h3 {
    font-size: 14px;
    margin: 0 0 8px 0;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.6px;
}

.muted { color: var(--muted); font-size: 12px; }

/* ---------- KPI ---------- */
.kpi .kpi-value {
    font-size: 36px;
    font-weight: 700;
    margin-top: 4px;
    background: linear-gradient(135deg, var(--accent), #b5179e);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.kpi .kpi-value.small { font-size: 22px; }
.kpi .kpi-value.alert { color: var(--warn); background: none; -webkit-text-fill-color: var(--warn); }

.kpi .kpi-label {
    font-size: 12px;
    color: var(--muted);
    margin-top: 2px;
}

.status {
    display: inline-block;
    margin-top: 12px;
    padding: 4px 12px;
    border-radius: 999px;
    background: rgba(46, 204, 113, 0.15);
    color: var(--success);
    font-size: 12px;
    font-weight: 600;
    border: 1px solid rgba(46, 204, 113, 0.35);
}

.status.overload { background: rgba(231, 76, 60, 0.18); color: var(--danger); border-color: rgba(231, 76, 60, 0.4); }
.status.under    { background: rgba(243, 156, 18, 0.18); color: var(--warn);  border-color: rgba(243, 156, 18, 0.4); }

/* ---------- Suggestions / alerts ---------- */
.suggestions, .alerts {
    list-style: none;
    padding: 0;
    margin: 0;
    max-height: 300px;
    overflow-y: auto;
}

.suggestions li, .alerts li {
    padding: 10px 12px;
    border-left: 3px solid var(--accent);
    background: rgba(76, 201, 240, 0.06);
    margin-bottom: 8px;
    border-radius: 6px;
    font-size: 13px;
    line-height: 1.4;
}

.alerts li.warn   { border-left-color: var(--warn);   background: rgba(243, 156, 18, 0.08); }
.alerts li.danger { border-left-color: var(--danger); background: rgba(231, 76, 60, 0.08); }

/* ---------- Footer ---------- */
.foot {
    display: flex;
    justify-content: space-between;
    padding: 14px 28px;
    color: var(--muted);
    font-size: 12px;
    border-top: 1px solid var(--border);
    margin-top: 20px;
}

/* ---------- Responsive ---------- */
@media (max-width: 1100px) {
    .grid { grid-template-columns: repeat(2, 1fr); }
    .card.wide { grid-column: span 2; }
}

@media (max-width: 640px) {
    .grid { grid-template-columns: 1fr; padding: 16px; }
    .card.wide { grid-column: span 1; }
    .topbar { flex-direction: column; align-items: flex-start; gap: 12px; padding: 14px 16px; }
    .kpi .kpi-value { font-size: 28px; }
}