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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: #f5f7fa;
    color: #2d3748;
    line-height: 1.6;
    overflow: hidden;
}

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

/* Sidebar */
.sidebar {
    width: 260px;
    background: linear-gradient(180deg, #2d3748 0%, #1a202c 100%);
    color: white;
    display: flex;
    flex-direction: column;
    box-shadow: 2px 0 8px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    transition: width 0.3s ease;
    position: relative;
    height: 100vh;
}

.sidebar.collapsed {
    width: 70px;
}

.sidebar-header {
    padding: 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: relative;
}

.sidebar-header h1 {
    font-size: 20px;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 10px;
    color: white;
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
}

.sidebar-title {
    transition: opacity 0.3s ease;
}

.sidebar.collapsed .sidebar-title {
    opacity: 0;
    width: 0;
    overflow: hidden;
}

.sidebar-toggle {
    background: rgba(255, 255, 255, 0.1);
    border: none;
    color: white;
    width: 32px;
    height: 32px;
    border-radius: 6px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    flex-shrink: 0;
}

.sidebar-toggle:hover {
    background: rgba(255, 255, 255, 0.2);
}

.sidebar-toggle i {
    transition: transform 0.3s ease;
}

.sidebar.collapsed .sidebar-toggle i {
    transform: rotate(180deg);
}

.sidebar-nav {
    flex: 1;
    padding: 16px 0;
    overflow-y: auto;
}

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

.nav-item {
    margin: 4px 12px;
}

.nav-item a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    border-radius: 8px;
    transition: all 0.2s;
    font-size: 14px;
    font-weight: 500;
    position: relative;
}

.nav-text {
    transition: opacity 0.3s ease;
    white-space: nowrap;
}

.sidebar.collapsed .nav-text {
    opacity: 0;
    width: 0;
    overflow: hidden;
}

.sidebar.collapsed .nav-item a {
    justify-content: center;
    padding: 12px;
}

.nav-item a:hover {
    background: rgba(255, 255, 255, 0.1);
    color: white;
}

.nav-item.active a {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    box-shadow: 0 2px 8px rgba(102, 126, 234, 0.3);
}

.nav-item i {
    font-size: 16px;
    width: 20px;
    text-align: center;
}

/* Sidebar Footer */
.sidebar-footer {
    padding: 16px 12px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    margin-top: auto;
}

.logout-btn {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    color: rgba(255, 255, 255, 0.8);
    background: transparent;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 14px;
    font-weight: 500;
    font-family: inherit;
    text-align: left;
}

.sidebar.collapsed .logout-btn {
    justify-content: center;
    padding: 12px;
}

.logout-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    color: white;
}

.logout-btn i {
    font-size: 16px;
    width: 20px;
    text-align: center;
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    background: #f5f7fa;
}

#content-area {
    flex: 1;
    overflow: hidden;
    position: relative;
}

#dashboard-frame {
    width: 100%;
    height: 100%;
    border: none;
    display: block;
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        width: 200px;
    }

    .sidebar.collapsed {
        width: 60px;
    }

    .sidebar-header h1 {
        font-size: 16px;
    }

    .nav-item a {
        padding: 10px 12px;
        font-size: 13px;
    }

    .sidebar.collapsed .nav-item a {
        padding: 10px;
    }
}