:root {
    --primary: #4f46e5;
    --primary-light: #818cf8;
    --primary-dark: #3730a3;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --sidebar-width: 240px;
    --sidebar-collapsed: 72px;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 10px 10px -5px rgba(0,0,0,0.04);
    --transition: all 0.2s ease;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
    background: var(--gray-50);
    color: var(--gray-800);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

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

.sidebar {
    width: var(--sidebar-width);
    background: white;
    border-right: 1px solid var(--gray-200);
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 100;
    display: flex;
    flex-direction: column;
    transition: width 0.3s ease;
}

.sidebar-header {
    padding: 20px 16px;
    border-bottom: 1px solid var(--gray-100);
}

.sidebar-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--gray-900);
}

.logo-icon {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 18px;
    flex-shrink: 0;
}

.logo-text {
    font-size: 16px;
    font-weight: 700;
    white-space: nowrap;
    overflow: hidden;
}

.sidebar-nav {
    flex: 1;
    padding: 12px 8px;
    overflow-y: auto;
}

.nav-section {
    margin-bottom: 24px;
}

.nav-section-title {
    font-size: 11px;
    font-weight: 600;
    color: var(--gray-400);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: 8px 12px;
    white-space: nowrap;
    overflow: hidden;
}

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

.nav-item {
    margin-bottom: 2px;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    color: var(--gray-600);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: var(--transition);
    white-space: nowrap;
}

.nav-link:hover {
    background: var(--gray-100);
    color: var(--gray-900);
}

.nav-link.active {
    background: rgba(79, 70, 229, 0.1);
    color: var(--primary);
}

.nav-link.active .nav-icon {
    color: var(--primary);
}

.nav-icon {
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    flex-shrink: 0;
    color: var(--gray-500);
}

.nav-text {
    overflow: hidden;
    text-overflow: ellipsis;
}

.nav-badge {
    margin-left: auto;
    padding: 2px 8px;
    background: var(--primary);
    color: white;
    font-size: 11px;
    font-weight: 600;
    border-radius: 10px;
}

.sidebar-footer {
    padding: 12px 8px;
    border-top: 1px solid var(--gray-100);
}

.sidebar-toggle {
    width: 100%;
    padding: 10px 12px;
    background: none;
    border: none;
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--gray-500);
    font-size: 14px;
    cursor: pointer;
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.sidebar-toggle:hover {
    background: var(--gray-100);
    color: var(--gray-700);
}

.toggle-icon {
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.3s ease;
}

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

.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    transition: margin-left 0.3s ease;
}

.sidebar.collapsed ~ .main-content {
    margin-left: var(--sidebar-collapsed);
}

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

.sidebar.collapsed .logo-text,
.sidebar.collapsed .nav-text,
.sidebar.collapsed .nav-section-title,
.sidebar.collapsed .nav-badge,
.sidebar.collapsed .toggle-text {
    opacity: 0;
    width: 0;
    overflow: hidden;
}

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

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

.content-header {
    background: white;
    border-bottom: 1px solid var(--gray-200);
    padding: 16px 24px;
    position: sticky;
    top: 0;
    z-index: 50;
}

.content-header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.page-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--gray-900);
}

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

.search-box {
    position: relative;
}

.search-input {
    width: 280px;
    padding: 10px 16px 10px 40px;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-md);
    font-size: 14px;
    outline: none;
    transition: var(--transition);
}

.search-input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.search-icon {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--gray-400);
    font-size: 16px;
}

.content-body {
    padding: 24px;
}

.mobile-header {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: white;
    border-bottom: 1px solid var(--gray-200);
    padding: 12px 16px;
    z-index: 100;
}

.mobile-header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.mobile-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 16px;
    font-weight: 700;
    color: var(--gray-900);
    text-decoration: none;
}

.menu-toggle {
    width: 40px;
    height: 40px;
    padding: 8px;
    background: none;
    border: none;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
}

.menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--gray-700);
    transition: var(--transition);
}

.menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

.mobile-menu {
    display: none;
    position: fixed;
    top: 56px;
    left: 0;
    right: 0;
    bottom: 0;
    background: white;
    z-index: 99;
    padding: 16px;
    overflow-y: auto;
}

.mobile-menu.active {
    display: block;
}

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

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

.mobile-nav-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 16px;
    color: var(--gray-700);
    text-decoration: none;
    font-size: 15px;
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.mobile-nav-link:hover,
.mobile-nav-link.active {
    background: rgba(79, 70, 229, 0.1);
    color: var(--primary);
}

.footer {
    background: white;
    border-top: 1px solid var(--gray-200);
    padding: 20px 24px;
    text-align: center;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 12px;
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--gray-500);
    text-decoration: none;
    font-size: 13px;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--primary);
}

.footer-copyright {
    font-size: 12px;
    color: var(--gray-400);
}

@media (max-width: 1024px) {
    .sidebar {
        display: none;
    }

    .main-content {
        margin-left: 0;
    }

    .mobile-header {
        display: block;
    }

    .content-body {
        padding: 16px;
        padding-top: 72px;
    }

    .content-header {
        display: none;
    }
}

@media (max-width: 640px) {
    .search-box {
        display: none;
    }
}