/* 基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --dark-bg: #1a1a1a;
    --darker-bg: #121212;
    --card-bg: #252525;
    --primary: #5e72e4; /* 更亮的蓝紫色 */
    --primary-hover: #4a5bd9;
    --accent-1: #ff7675; /* 粉红色调 */
    --accent-2: #00cec9; /* 青色调 */
    --accent-3: #ffeaa7; /* 淡黄色调 */
    --accent-4: #6c5ce7; /* 紫色调 */
    --text-primary: #f5f5f7;
    --text-secondary: #a1a1a6;
    --border-color: #333;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--dark-bg);
    background-image: radial-gradient(circle at 10% 20%, rgba(94, 114, 228, 0.1) 0%, rgba(0, 0, 0, 0) 50%),
                      radial-gradient(circle at 90% 80%, rgba(255, 118, 117, 0.1) 0%, rgba(0, 0, 0, 0) 50%);
    background-attachment: fixed;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

a {
    text-decoration: none;
    color: var(--primary);
}

/* 导航栏样式 */
.nav-container {
    background-color: rgba(18, 18, 18, 0.95);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.main-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
}

.nav-right {
    display: flex;
    align-items: center;
}

.logo {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
}

.logo i {
    color: var(--accent-1);
    margin-right: 8px;
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.5rem;
    cursor: pointer;
}

.nav-links {
    display: flex;
    list-style: none;
}

.nav-links li {
    margin-left: 25px;
}

.nav-links a {
    color: var(--text-primary);
    font-size: 0.95rem;
    font-weight: 500;
    transition: all 0.3s ease;
    padding: 5px 10px;
    border-radius: 4px;
    position: relative;
}

.nav-links a:hover, 
.nav-links a.active {
    color: var(--primary);
    background-color: rgba(94, 114, 228, 0.1);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: all 0.3s ease;
    transform: translateX(-50%);
}

.nav-links a:hover::after,
.nav-links a.active::after {
    width: 70%;
}

/* 语言切换 */
.lang-selector {
    position: relative;
    margin-left: 30px;
}

.lang-current {
    display: flex;
    align-items: center;
    cursor: pointer;
    color: var(--text-primary);
    font-size: 0.9rem;
}

.lang-current i {
    margin-left: 5px;
    font-size: 0.8rem;
}

.lang-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    background-color: var(--darker-bg);
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    padding: 10px 0;
    width: 150px;
    display: none;
    z-index: 101;
}

.lang-dropdown.active {
    display: block;
    animation: fadeIn 0.3s forwards;
}

.lang-dropdown a {
    display: block;
    padding: 8px 15px;
    color: var(--text-secondary);
    font-size: 0.9rem;
    transition: all 0.2s;
}

.lang-dropdown a:hover {
    background-color: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
}

.lang-dropdown a.active {
    color: var(--primary);
    font-weight: 500;
}

/* 头部样式 */
header {
    color: var(--text-primary);
    padding: 160px 0 100px;
    text-align: center;
    margin-bottom: 50px;
    position: relative;
    overflow: hidden;
}

.header-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background-image: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)), url('https://images.unsplash.com/photo-1522071820081-009f0129c71c');
    background-size: cover;
    background-position: center;
    filter: brightness(0.6);
}

.header-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
    margin: 0 auto;
}

header h1 {
    font-size: 3.2rem;
    margin-bottom: 20px;
    font-weight: 700;
    letter-spacing: -0.5px;
    background: linear-gradient(120deg, var(--primary), var(--accent-1));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    text-shadow: 0 5px 25px rgba(94, 114, 228, 0.3);
}

header p {
    font-size: 1.3rem;
    opacity: 0.9;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto;
}

/* 卡片部分样式 */
.card-section {
    margin-bottom: 60px;
}

.card-section h2 {
    font-size: 1.8rem;
    margin-bottom: 25px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
    font-weight: 600;
    position: relative;
}

.card-section h2::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 100px;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), transparent);
}

.card-container {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
    margin-top: 2rem;
}

.card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 1.5rem;
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    height: 100%;
    position: relative;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 0;
    background: var(--accent-1);
    transition: height 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
    border-color: rgba(94, 114, 228, 0.2);
}

.card:hover::before {
    height: 100%;
}

.card:nth-child(3n+1)::before {
    background: var(--accent-1);
}

.card:nth-child(3n+2)::before {
    background: var(--accent-2);
}

.card:nth-child(3n+3)::before {
    background: var(--accent-4);
}

.card-header {
    display: flex;
    align-items: center;
    margin-bottom: 12px;
}

.card-icon {
    font-size: 1.5rem;
    margin-right: 12px;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: rgba(94, 114, 228, 0.1);
    transition: all 0.3s ease;
}

.card:nth-child(3n+1) .card-icon {
    color: var(--accent-1);
    background: rgba(255, 118, 117, 0.1);
}

.card:nth-child(3n+2) .card-icon {
    color: var(--accent-2);
    background: rgba(0, 206, 201, 0.1);
}

.card:nth-child(3n+3) .card-icon {
    color: var(--accent-4);
    background: rgba(108, 92, 231, 0.1);
}

.card:hover .card-icon {
    transform: scale(1.1);
}

.card h3 {
    font-size: 1.1rem;
    color: var(--text-primary);
    font-weight: 600;
    margin: 0;
    line-height: 1.4;
}

.card-tags {
    display: flex;
    gap: 0.4rem;
    margin: 0.5rem 0;
    flex-wrap: wrap;
}

.tag {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-secondary);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-size: 0.7rem;
    font-weight: 500;
}

.card:hover .tag {
    background-color: rgba(255, 255, 255, 0.12);
}

.card p {
    color: var(--text-secondary);
    margin-bottom: 12px;
    font-size: 0.9rem;
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    text-overflow: ellipsis;
    flex-grow: 1;
}

.card a {
    display: inline-block;
    background-color: var(--primary);
    color: white;
    padding: 8px 16px;
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    z-index: 1;
    text-align: center;
    width: 100%;
    margin-top: auto;
}

.card a::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transition: all 0.5s ease;
    z-index: -1;
}

.card a:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(94, 114, 228, 0.3);
}

.card a:hover::before {
    left: 100%;
}

/* 页脚样式 */
footer {
    background-color: var(--darker-bg);
    color: var(--text-secondary);
    padding: 30px 0;
    text-align: center;
    margin-top: 60px;
    position: relative;
    overflow: hidden;
}

footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-color), transparent);
}

footer p {
    opacity: 0.9;
    position: relative;
    z-index: 1;
    font-size: 0.9rem;
}

/* 动画 */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes pulseGlow {
    0% { box-shadow: 0 0 0 0 rgba(94, 114, 228, 0.4); }
    70% { box-shadow: 0 0 0 10px rgba(94, 114, 228, 0); }
    100% { box-shadow: 0 0 0 0 rgba(94, 114, 228, 0); }
}

/* 响应式设计 */
@media (max-width: 1200px) {
    .card-container {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 900px) {
    .card-container {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 600px) {
    .card-container {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    header {
        padding: 100px 0 60px;
    }
    
    header h1 {
        font-size: 2.4rem;
    }
    
    header p {
        font-size: 1.1rem;
    }
    
    .menu-toggle {
        display: block;
    }
    
    .nav-links {
        position: fixed;
        top: 60px;
        left: 0;
        right: 0;
        background-color: rgba(18, 18, 18, 0.95);
        backdrop-filter: blur(10px);
        -webkit-backdrop-filter: blur(10px);
        flex-direction: column;
        padding: 20px 0;
        box-shadow: 0 5px 10px rgba(0, 0, 0, 0.2);
        transform: translateY(-150%);
        transition: transform 0.3s ease;
        z-index: 99;
    }
    
    .nav-links.active {
        transform: translateY(0);
    }
    
    .nav-links li {
        margin: 0;
        width: 100%;
        text-align: center;
    }
    
    .nav-links a {
        display: block;
        padding: 12px 0;
        border-radius: 0;
    }
    
    .nav-links a::after {
        display: none;
    }
    
    .lang-selector {
        margin: 15px 0 0;
        width: 100%;
        display: flex;
        justify-content: center;
    }
    
    .lang-dropdown {
        width: 200px;
        left: 50%;
        transform: translateX(-50%);
        right: auto;
    }
}

@media (max-width: 480px) {
    header h1 {
        font-size: 2rem;
    }
    
    header p {
        font-size: 1rem;
    }
    
    .card-container {
        grid-template-columns: 1fr;
    }
}