/* Global CSS Variables - Themes */
:root[data-theme="light"] {
    --bg-primary: #f8fafc;
    --bg-sidebar: #ffffff;
    --bg-content: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --accent-color: #0ea5e9;
    --accent-hover: #0284c7;
    --sidebar-hover: #f1f5f9;
    --nav-active: #e0f2fe;
    --nav-active-text: #0369a1;
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --status-online: #22c55e;
    --status-offline: #ef4444;
}

:root[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-sidebar: #1e293b;
    --bg-content: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --border-color: #334155;
    --accent-color: #38bdf8;
    --accent-hover: #7dd3fc;
    --sidebar-hover: #334155;
    --nav-active: #0ea5e9;
    --nav-active-text: #ffffff;
    --shadow: 0 10px 15px -3px rgb(0 0 0 / 0.4), 0 4px 6px -4px rgb(0 0 0 / 0.4);
    --status-online: #4ade80;
    --status-offline: #f87171;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

.app-container {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 260px;
    background-color: var(--bg-sidebar);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    position: sticky;
    top: 0;
    height: 100vh;
    z-index: 100;
}

.sidebar-header {
    padding: 24px;
    border-bottom: 1px solid var(--border-color);
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon {
    background-color: var(--accent-color);
    color: white;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    font-weight: bold;
    font-size: 1.2rem;
}

.logo-text {
    font-weight: 700;
    letter-spacing: 1px;
    font-size: 1.1rem;
    color: var(--text-primary);
}

.sidebar-nav {
    flex: 1;
    overflow-y: auto;
    padding: 16px 12px;
}

.nav-list {
    list-style: none;
}

.nav-item {
    margin-bottom: 4px;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    text-decoration: none;
    color: var(--text-secondary);
    border-radius: 8px;
    transition: all 0.2s;
    font-size: 0.95rem;
    font-weight: 500;
}

.nav-link:hover {
    background-color: var(--sidebar-hover);
    color: var(--text-primary);
}

.nav-link.active {
    background-color: var(--nav-active);
    color: var(--nav-active-text);
}

.nav-link i {
    width: 20px;
    height: 20px;
}

/* Sidebar Footer */
.sidebar-footer {
    padding: 16px;
    border-top: 1px solid var(--border-color);
}

.btn-theme {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px;
    background: none;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s;
}

.btn-theme:hover {
    background-color: var(--sidebar-hover);
}

/* Theme Icon Visibility */
:root[data-theme="light"] #sun-icon { display: none; }
:root[data-theme="dark"] #moon-icon { display: none; }

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.content-header {
    height: 80px;
    background-color: var(--bg-content);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 32px;
    position: sticky;
    top: 0;
    z-index: 90;
}

.content-header h1 {
    font-size: 1.5rem;
    font-weight: 700;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 24px;
}

.status-badge {
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
}

.status-online {
    background-color: rgba(74, 222, 128, 0.1);
    color: var(--status-online);
    border: 1px solid var(--status-online);
}

.status-offline {
    background-color: rgba(248, 113, 113, 0.1);
    color: var(--status-offline);
    border: 1px solid var(--status-offline);
}

.user-profile .avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 2px solid var(--border-color);
}

.content-area {
    padding: 32px;
    overflow-y: auto;
}

/* Utility Cards */
.card {
    background-color: var(--bg-content);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 24px;
    box-shadow: var(--shadow);
}