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

:root {
    --primary: #667eea;
    --secondary: #764ba2;
    --sidebar-width: 280px;
    --sidebar-collapsed-width: 80px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: #f8f9fa;
    overflow-x: hidden;
}

/* Sidebar */
.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    height: 100vh;
    width: var(--sidebar-width);
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    padding: 0;
    margin: 0;
    z-index: 1000;
    overflow-y: auto;
    transition: all 0.3s ease;
    box-shadow: 0 2px 15px rgba(0, 0, 0, 0.1);
}

.sidebar.collapsed {
    width: var(--sidebar-collapsed-width);
}

/* Sidebar Brand */
.sidebar-brand {
    padding: 25px 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: white;
    transition: all 0.3s ease;
}

.sidebar.collapsed .sidebar-brand {
    justify-content: center;
    padding: 20px 10px;
}

.sidebar-brand i {
    font-size: 28px;
    flex-shrink: 0;
}

.sidebar-brand span {
    font-size: 20px;
    font-weight: 700;
    white-space: nowrap;
}

.sidebar.collapsed .sidebar-brand span {
    display: none;
}

/* Sidebar Navigation */
.sidebar-nav {
    list-style: none;
    padding: 20px 0;
    margin: 0;
}

.sidebar-nav-item {
    margin: 0;
    padding: 0;
}

.sidebar-nav-link {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 14px 20px;
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: all 0.3s ease;
    border-left: 3px solid transparent;
    font-size: 15px;
    font-weight: 500;
}

.sidebar.collapsed .sidebar-nav-link {
    justify-content: center;
    padding: 14px 10px;
    gap: 0;
}

.sidebar-nav-link:hover {
    background-color: rgba(255, 255, 255, 0.1);
    color: white;
    border-left-color: white;
}

.sidebar-nav-link.active {
    background-color: rgba(255, 255, 255, 0.15);
    color: white;
    border-left-color: white;
}

.sidebar-nav-link i {
    font-size: 20px;
    flex-shrink: 0;
    width: 20px;
}

.sidebar-nav-link span {
    white-space: nowrap;
}

.sidebar.collapsed .sidebar-nav-link span {
    display: none;
}

/* Sidebar Section */
.sidebar-section {
    padding: 12px 20px 8px 20px;
    font-size: 11px;
    font-weight: 700;
    color: rgba(255, 255, 255, 0.5);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-top: 10px;
}

.sidebar.collapsed .sidebar-section {
    display: none;
}

/* Main Content */
.main-wrapper {
    margin-left: var(--sidebar-width);
    transition: margin-left 0.3s ease;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.main-wrapper.collapsed {
    margin-left: var(--sidebar-collapsed-width);
}

/* Top Navigation Bar */
.topbar {
    background: white;
    border-bottom: 1px solid #e0e0e0;
    padding: 15px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.topbar-left {
    display: flex;
    align-items: center;
    gap: 20px;
}

.topbar-toggle {
    background: none;
    border: none;
    font-size: 24px;
    color: var(--primary);
    cursor: pointer;
    padding: 0;
    line-height: 1;
}

.topbar-title {
    font-size: 18px;
    font-weight: 600;
    color: #333;
    margin: 0;
}

.topbar-right {
    display: flex;
    align-items: center;
    gap: 20px;
}

/* Language Selector */
.language-selector {
    display: flex;
    align-items: center;
    gap: 8px;
}

.lang-btn {
    background: none;
    border: none;
    color: #667;
    font-weight: 600;
    font-size: 12px;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 4px;
    transition: all 0.3s;
    text-decoration: none;
}

.lang-btn:hover {
    background-color: #f0f0f0;
    color: var(--primary);
}

.lang-btn.active {
    background-color: #e8e8ff;
    color: var(--primary);
}

/* User Menu */
.user-menu {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 8px 12px;
    border-radius: 6px;
    cursor: pointer;
    background-color: #f5f5f5;
    transition: all 0.3s;
    text-decoration: none;
    color: #333;
    border: none;
}

.user-menu:hover {
    background-color: #e8e8ff;
    color: var(--primary);
}

.user-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 14px;
}

/* Main Content Area */
.main-content {
    flex: 1;
    padding: 30px;
    overflow-y: auto;
}

/* Footer */
.footer {
    background: white;
    border-top: 1px solid #e0e0e0;
    padding: 20px 30px;
    text-align: center;
    color: #666;
    font-size: 13px;
}

/* Dropdowns */
.dropdown-menu {
    border: none;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    border-radius: 6px;
}

.dropdown-item {
    font-size: 14px;
    padding: 10px 15px;
}

.dropdown-item:hover,
.dropdown-item:focus {
    background-color: #f5f5f5;
    color: var(--primary);
}

.dropdown-divider {
    margin: 0.5rem 0;
}

/* Responsive */
@media (max-width: 768px) {
    :root {
        --sidebar-width: 250px;
        --sidebar-collapsed-width: 60px;
    }

    .sidebar {
        z-index: 999;
    }

    .sidebar-nav-link {
        padding: 12px 15px;
    }

    .main-content {
        padding: 20px 15px;
    }

    .topbar {
        padding: 12px 15px;
    }
}

@media (max-width: 576px) {
    :root {
        --sidebar-width: 0;
        --sidebar-collapsed-width: 0;
    }

    .sidebar {
        width: 250px !important;
        transform: translateX(-100%);
    }

    .sidebar.show {
        transform: translateX(0);
    }

    .main-wrapper {
        margin-left: 0 !important;
    }

    .topbar {
        z-index: 1001;
    }
}