:root {
    --admin-bg: #0f172a;
    --admin-sidebar: #1e293b;
    --admin-card: rgba(30, 41, 59, 0.7);
    --admin-primary: #38bdf8;
    --admin-accent: #818cf8;
    --admin-text: #f8fafc;
    --admin-text-muted: #94a3b8;
    --admin-danger: #ef4444;
    --admin-warning: #f59e0b;
    --admin-success: #10b981;
    --glass-border: rgba(255, 255, 255, 0.1);
}

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

body {
    background-color: var(--admin-bg);
    color: var(--admin-text);
    font-family: 'Noto Sans TC', sans-serif;
    display: flex;
    min-height: 100vh;
    overflow-x: hidden;
}

/* Sidebar Styles */
.sidebar {
    width: 260px;
    background: var(--admin-sidebar);
    border-right: 1px solid var(--glass-border);
    display: flex;
    flex-direction: column;
    padding: 20px;
    position: fixed;
    height: 100vh;
    z-index: 100;
}

.sidebar-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding-bottom: 30px;
    border-bottom: 1px solid var(--glass-border);
    margin-bottom: 30px;
}

.sidebar-header img {
    width: 40px;
    height: auto;
}

.sidebar-header h2 {
    font-size: 1.2rem;
    font-family: 'Orbitron', sans-serif;
    background: linear-gradient(90deg, var(--admin-primary), var(--admin-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-menu {
    list-style: none;
    flex-grow: 1;
}

.nav-item {
    margin-bottom: 10px;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 15px;
    color: var(--admin-text-muted);
    text-decoration: none;
    border-radius: 8px;
    transition: 0.3s;
}

.nav-link:hover, .nav-link.active {
    background: rgba(56, 189, 248, 0.1);
    color: var(--admin-primary);
}

.nav-link ion-icon {
    font-size: 1.4rem;
}

/* Main Content Area */
.main-content {
    margin-left: 260px;
    flex-grow: 1;
    padding: 40px;
    width: calc(100% - 260px);
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 40px;
}

.welcome-text h1 {
    font-size: 2rem;
    margin-bottom: 5px;
}

.welcome-text p {
    color: var(--admin-text-muted);
}

.user-profile {
    display: flex;
    align-items: center;
    gap: 15px;
    background: var(--admin-card);
    padding: 8px 15px;
    border-radius: 50px;
    border: 1px solid var(--glass-border);
}

.user-profile img {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: 2px solid var(--admin-primary);
}

/* Dashboard Grid */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 25px;
    margin-bottom: 40px;
}

.stat-card {
    background: var(--admin-card);
    backdrop-filter: blur(10px);
    padding: 25px;
    border-radius: 20px;
    border: 1px solid var(--glass-border);
    transition: 0.3s;
}

.stat-card:hover {
    transform: translateY(-5px);
    border-color: var(--admin-primary);
}

.stat-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.stat-icon {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.stat-icon.registrations { background: rgba(56, 189, 248, 0.2); color: var(--admin-primary); }
.stat-icon.online { background: rgba(16, 185, 129, 0.2); color: var(--admin-success); }
.stat-icon.orders { background: rgba(245, 158, 11, 0.2); color: var(--admin-warning); }
.stat-icon.alerts { background: rgba(239, 68, 68, 0.2); color: var(--admin-danger); }

.stat-value {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 5px;
    font-family: 'Orbitron', sans-serif;
}

.stat-label {
    color: var(--admin-text-muted);
    font-size: 0.9rem;
}

.stat-trend {
    margin-top: 10px;
    font-size: 0.8rem;
    display: flex;
    align-items: center;
    gap: 5px;
}

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

/* Main Widgets */
.widgets-container {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 25px;
}

.widget {
    background: var(--admin-card);
    backdrop-filter: blur(10px);
    padding: 30px;
    border-radius: 24px;
    border: 1px solid var(--glass-border);
}

.widget-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
}

.widget-title {
    font-size: 1.2rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 10px;
}

/* Chart Mockup */
.usage-chart-container {
    height: 300px;
    display: flex;
    align-items: flex-end;
    gap: 15px;
    padding-top: 20px;
}

.chart-bar-wrapper {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
}

.chart-bar {
    width: 100%;
    background: linear-gradient(to top, var(--admin-primary), var(--admin-accent));
    border-radius: 8px 8px 0 0;
    transition: 1s ease-out;
    position: relative;
}

.chart-bar:hover {
    filter: brightness(1.2);
}

.chart-label {
    font-size: 0.75rem;
    color: var(--admin-text-muted);
    text-align: center;
    white-space: nowrap;
}

/* List Style Widgets */
.announcement-list, .alert-list {
    list-style: none;
}

.list-item {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 15px 0;
    border-bottom: 1px solid var(--glass-border);
}

.list-item:last-child {
    border-bottom: none;
}

.item-icon {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
}

.item-content {
    flex-grow: 1;
}

.item-title {
    font-size: 0.95rem;
    font-weight: 500;
    margin-bottom: 2px;
}

.item-meta {
    font-size: 0.8rem;
    color: var(--admin-text-muted);
}

/* System Status */
.status-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 15px;
}

.status-item {
    background: rgba(255, 255, 255, 0.03);
    padding: 15px;
    border-radius: 12px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.status-indicator {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
}

.dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
}

.dot.online { background: var(--admin-success); box-shadow: 0 0 10px var(--admin-success); }
.dot.warning { background: var(--admin-warning); box-shadow: 0 0 10px var(--admin-warning); }

/* Responsive */
@media (max-width: 1200px) {
    .dashboard-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .widgets-container {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .sidebar {
        width: 80px;
        padding: 20px 10px;
    }
    .sidebar-header h2, .nav-link span {
        display: none;
    }
    .main-content {
        margin-left: 80px;
        width: calc(100% - 80px);
        padding: 20px;
    }
    .dashboard-grid {
        grid-template-columns: 1fr;
    }
}