:root {
    --primary: #1e6bff;
    --primary-light: #4a8aff;
    --primary-dark: #0d4fcc;
    --secondary: #00c6ff;
    --accent: #0072ff;
    --white: #ffffff;
    --light-bg: #f5f9ff;
    --light-gray: #e6f0ff;
    --text: #2c3e50;
    --text-light: #7f8c8d;
    --shadow: rgba(30, 107, 255, 0.15);
    --sidebar-width: 280px;
    --header-height: 70px;
    --transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', system-ui, sans-serif;
    line-height: 1.6;
    color: var(--text);
    background: linear-gradient(135deg, var(--light-bg) 0%, #e6f0ff 100%);
    min-height: 100vh;
    overflow-x: hidden;
}

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

.sidebar {
    width: var(--sidebar-width);
    background: linear-gradient(180deg, var(--white) 0%, var(--light-gray) 100%);
    box-shadow: 5px 0 15px var(--shadow);
    position: fixed;
    height: 100vh;
    z-index: 100;
    display: flex;
    flex-direction: column;
    transition: var(--transition);
    transform: translateX(0);
}

.sidebar-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--light-gray);
    text-align: center;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    color: var(--primary);
    font-size: 1.5rem;
    font-weight: 700;
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    animation: rotate 10s linear infinite;
}

.sidebar-nav {
    flex: 1;
    padding: 1.5rem 0;
}

.nav-item {
    display: flex;
    align-items: center;
    padding: 1rem 1.5rem;
    color: var(--text);
    text-decoration: none;
    transition: var(--transition);
    position: relative;
    border-left: 4px solid transparent;
}

.nav-item:hover {
    background: var(--light-gray);
    color: var(--primary);
    border-left-color: var(--primary-light);
}

.nav-item.active {
    background: var(--light-gray);
    color: var(--primary);
    border-left-color: var(--primary);
    font-weight: 600;
}

.nav-item i {
    margin-right: 12px;
    font-size: 1.2rem;
    width: 24px;
    text-align: center;
}

.sidebar-footer {
    padding: 1.5rem;
    border-top: 1px solid var(--light-gray);
    text-align: center;
    font-size: 0.9rem;
    color: var(--text-light);
}

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

.top-aggregation {
    background: var(--white);
    box-shadow: 0 4px 12px var(--shadow);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 99;
    height: var(--header-height);
}

.search-box {
    display: flex;
    align-items: center;
    background: var(--light-bg);
    border-radius: 30px;
    padding: 0.5rem 1rem;
    width: 300px;
    transition: var(--transition);
}

.search-box:focus-within {
    box-shadow: 0 0 0 2px var(--primary-light);
}

.search-box input {
    border: none;
    background: transparent;
    outline: none;
    padding: 0.5rem;
    width: 100%;
    color: var(--text);
}

.search-box i {
    color: var(--text-light);
}

.user-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.notification-bell, .user-profile {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--light-bg);
    color: var(--primary);
    cursor: pointer;
    transition: var(--transition);
}

.notification-bell:hover, .user-profile:hover {
    background: var(--primary-light);
    color: white;
    transform: translateY(-2px);
}

.content {
    padding: 2rem;
    animation: fadeIn 0.5s ease-out;
}

.page-header {
    margin-bottom: 2rem;
    animation: slideInDown 0.5s ease-out;
}

.page-title {
    font-size: 2.2rem;
    color: var(--primary);
    margin-bottom: 0.5rem;
    position: relative;
    display: inline-block;
}

.page-title::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    border-radius: 2px;
}

.page-desc {
    font-size: 1.1rem;
    color: var(--text-light);
    max-width: 700px;
    line-height: 1.7;
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.8rem;
}

.data-card {
    background: var(--white);
    border-radius: 16px;
    padding: 2rem 1.5rem;
    box-shadow: 0 4px 12px var(--shadow);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    animation: fadeInUp 0.5s ease-out;
}

.data-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 24px var(--shadow);
}

.data-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    opacity: 0;
    transition: var(--transition);
}

.data-card:hover::before {
    opacity: 1;
}

.card-icon {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    transition: var(--transition);
    position: relative;
    color: var(--primary);
}

.card-icon::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 0;
    height: 0;
    background: var(--primary);
    border-radius: 50%;
    opacity: 0;
    transition: var(--transition);
}

.data-card:hover .card-icon::after {
    width: 60px;
    height: 60px;
    opacity: 0.1;
}

.card-name {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--primary);
}

.card-desc {
    font-size: 0.95rem;
    color: var(--text-light);
    line-height: 1.5;
    margin-bottom: 1.2rem;
    flex-grow: 1;
}

.card-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 1.2rem;
    background: var(--light-bg);
    color: var(--primary);
    border-radius: 24px;
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.card-link::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(30, 107, 255, 0.1), transparent);
    transform: translateX(-100%);
    transition: var(--transition);
}

.card-link:hover {
    background: var(--primary-light);
    color: white;
    box-shadow: 0 4px 12px rgba(30, 107, 255, 0.2);
}

.card-link:hover::before {
    transform: translateX(100%);
}

.groups-container {
    max-width: 1000px;
}

.group-category {
    margin-bottom: 3rem;
    animation: fadeIn 0.6s ease-out;
}

.category-title {
    font-size: 1.8rem;
    color: var(--primary);
    margin-bottom: 1.5rem;
    padding-left: 1rem;
    border-left: 4px solid var(--primary-light);
}

.about-section {
    max-width: 800px;
    background: var(--white);
    padding: 2.5rem;
    border-radius: 20px;
    box-shadow: 0 6px 18px var(--shadow);
    animation: fadeIn 0.6s ease-out;
}

.about-text {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--text);
    margin-bottom: 2.5rem;
    text-align: center;
}

.social-links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.loader {
    display: none;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 50px;
    height: 50px;
    border: 5px solid #f3f3f3;
    border-top: 5px solid var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    z-index: 9999;
}

.floating-elements {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: -1;
}

.floating-element {
    position: absolute;
    background: rgba(30, 107, 255, 0.05);
    border-radius: 50%;
    animation: float 15s infinite linear;
}

.menu-toggle {
    display: none;
    background: var(--primary);
    color: white;
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 8px;
    font-size: 1.2rem;
    cursor: pointer;
    transition: var(--transition);
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

@keyframes spin {
    0% { transform: translate(-50%, -50%) rotate(0deg); }
    100% { transform: translate(-50%, -50%) rotate(360deg); }
}

@keyframes float {
    0% {
        transform: translateY(0) rotate(0deg);
        opacity: 0;
    }
    10% {
        opacity: 1;
    }
    90% {
        opacity: 1;
    }
    100% {
        transform: translateY(-100vh) rotate(360deg);
        opacity: 0;
    }
}

@media (max-width: 1024px) {
    .sidebar {
        transform: translateX(-100%);
    }
    .sidebar.active {
        transform: translateX(0);
    }
    .main-content {
        margin-left: 0;
    }
    .menu-toggle {
        display: flex;
        align-items: center;
        justify-content: center;
    }
}

@media (max-width: 768px) {
    .top-aggregation {
        padding: 1rem;
        flex-wrap: wrap;
        height: auto;
        gap: 1rem;
    }
    .search-box {
        width: 100%;
        order: 2;
    }
    .card-grid {
        grid-template-columns: 1fr;
    }
    .about-section {
        padding: 1.5rem;
    }
    .social-links {
        grid-template-columns: 1fr;
    }
}