:root {
    --bg-color: #0c111d;
    --card-bg: rgba(30, 41, 59, 0.7);
    --primary: #38bdf8;
    --success: #10b981;
    --warning: #fbbf24;
    --text-main: #f1f5f9;
    --text-dim: #94a3b8;
    --border: rgba(255, 255, 255, 0.1);
}

body {
    background-color: var(--bg-color);
    background-image: radial-gradient(circle at 50% -20%, #1e293b 0%, #0c111d 80%);
    color: var(--text-main);
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header {
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(12px);
    padding: 1.25rem 2.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
}

h1 {
    margin: 0;
    font-size: 1.4rem;
    letter-spacing: -0.025em;
}

.subtitle {
    font-weight: 400;
    color: var(--text-dim);
    font-size: 0.85rem;
    margin-left: 0.5rem;
}

.badge {
    padding: 0.5rem 1.25rem;
    border-radius: 99px;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.05em;
}

.connected { background: rgba(16, 185, 129, 0.2); color: #34d399; border: 1px solid rgba(16, 185, 129, 0.3); }
.warning { background: rgba(251, 191, 36, 0.2); color: #fbbf24; border: 1px solid rgba(251, 191, 36, 0.3); }
.disconnected { background: rgba(239, 68, 68, 0.2); color: #f87171; border: 1px solid rgba(239, 68, 68, 0.3); }

main {
    padding: 2.5rem;
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
    box-sizing: border-box;
}

.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.card {
    background: var(--card-bg);
    backdrop-filter: blur(8px);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
}

h2 {
    margin: 0 0 1.25rem 0;
    font-size: 1rem;
    font-weight: 600;
    color: var(--primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

ul {
    list-style: none;
    padding: 0;
    margin: 0;
    flex-grow: 1;
    overflow-y: auto;
    max-height: 500px;
}

li {
    padding: 1rem;
    border-bottom: 1px solid var(--border);
    transition: background 0.2s;
}

li:hover {
    background: rgba(255, 255, 255, 0.03);
}

.item-main {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 500;
}

.item-sub {
    font-size: 0.75rem;
    color: var(--text-dim);
    margin-top: 0.4rem;
    display: flex;
    justify-content: space-between;
}

.history-por { color: var(--primary); font-weight: 600; }
.history-hora { color: var(--text-dim); }

.empty-msg {
    color: var(--text-dim);
    font-style: italic;
    font-size: 0.9rem;
    text-align: center;
    padding: 3rem 1rem;
}

#qr-container {
    background: white;
    color: #0f172a;
    border-radius: 16px;
    padding: 2.5rem;
    text-align: center;
    margin-bottom: 2rem;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.5);
}

#qrcode img {
    margin: 1.5rem auto 0;
    display: block;
}

.logs {
    margin-top: 2rem;
    grid-column: span 3;
}

#log-console {
    background: #000;
    color: #10b981;
    font-family: 'Fira Code', monospace;
    padding: 1rem;
    border-radius: 12px;
    height: 120px;
    overflow-y: auto;
    font-size: 0.8rem;
    border: 1px solid var(--border);
}

.hidden { display: none !important; }

@media (max-width: 1024px) {
    .dashboard-grid { grid-template-columns: 1fr 1fr; }
    .logs { grid-column: span 2; }
}

@media (max-width: 640px) {
    .dashboard-grid { grid-template-columns: 1fr; }
    .logs { grid-column: span 1; }
    main { padding: 1.25rem; }
}