:root {
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --bg-dark: #0f172a;
    --card-bg: rgba(30, 41, 59, 0.7);
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --success: #22c55e;
    --danger: #ef4444;
    --glass-border: rgba(255, 255, 255, 0.1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Outfit', sans-serif;
    background: radial-gradient(circle at top left, #1e1b4b, #0f172a);
    color: var(--text-main);
    min-height: 100vh;
    padding: 2rem;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 3rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--glass-border);
}

.logo {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo i {
    font-size: 2rem;
    color: var(--primary);
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 600;
    letter-spacing: -0.025em;
}

.status-bar span {
    padding: 0.5rem 1rem;
    border-radius: 2rem;
    font-size: 0.875rem;
    font-weight: 500;
    background: var(--glass-border);
}

.status-online { color: var(--success); border: 1px solid var(--success); }
.status-offline { color: var(--danger); border: 1px solid var(--danger); }

.overview {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.card {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 1.5rem;
    padding: 1.5rem;
    transition: transform 0.3s ease, border-color 0.3s ease;
}

.card:hover {
    transform: translateY(-4px);
    border-color: var(--primary);
}

.stat-card h3 {
    font-size: 0.875rem;
    color: var(--text-muted);
    text-transform: uppercase;
    margin-bottom: 0.5rem;
}

.stat-card p {
    font-size: 2rem;
    font-weight: 600;
}

.device-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
}

.device-card {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.device-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
}

.device-info h4 {
    font-size: 1.25rem;
    margin-bottom: 0.25rem;
}

.device-id {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-family: monospace;
}

.badge {
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    font-size: 0.75rem;
    font-weight: 600;
}

.badge-online { background: rgba(34, 197, 94, 0.2); color: var(--success); }
.badge-offline { background: rgba(239, 68, 68, 0.2); color: var(--danger); }

.device-state {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(0, 0, 0, 0.2);
    padding: 1rem;
    border-radius: 1rem;
    min-height: 4rem; /* Giữ cố định chiều cao */
}

.state-label { color: var(--text-muted); font-size: 0.875rem; }

.state-value-group {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 4px;
}

.state-value { font-weight: 600; font-size: 1.1rem; }

.countdown-timer {
    font-size: 0.75rem;
    color: #facc15;
    background: rgba(250, 204, 21, 0.1);
    padding: 2px 8px;
    border-radius: 4px;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateX(10px); }
    to { opacity: 1; transform: translateX(0); }
}

.api-console {
    margin-top: 3rem;
}

.api-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.api-header h3 {
    font-size: 1rem;
    color: var(--text-muted);
}

#api-code {
    background: #000;
    padding: 1.5rem;
    border-radius: 0.75rem;
    font-family: monospace;
    font-size: 0.85rem;
    color: #a5f3fc;
    overflow-x: auto;
    border: 1px solid var(--glass-border);
    white-space: pre-wrap;
}

.btn-copy {
    background: transparent;
    border: 1px solid var(--primary);
    color: var(--primary);
    padding: 4px 12px;
    border-radius: 6px;
    font-size: 0.75rem;
    cursor: pointer;
}

.controls {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
}

button {
    padding: 0.75rem;
    border-radius: 0.75rem;
    border: none;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.2s;
    font-family: inherit;
}

.btn-on { background: var(--primary); color: white; }
.btn-off { background: var(--glass-border); color: var(--text-main); }

button:hover { opacity: 0.9; transform: scale(0.98); }
button:active { transform: scale(0.95); }

button:disabled { opacity: 0.5; cursor: not-allowed; }

@keyframes pulse {
    0% { opacity: 1; }
    50% { opacity: 0.5; }
    100% { opacity: 1; }
}

.loading { animation: pulse 1.5s infinite; }