/* 通用样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2563eb;
    --secondary-color: #7c3aed;
    --text-dark: #1f2937;
    --text-light: #6b7280;
    --bg-light: #f9fafb;
    --white: #ffffff;
    --gradient-1: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-2: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-3: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: rgba(255, 255, 255, 0.9);
    background-color: var(--white);
}

/* 导航栏样式 - GitHub 风格 */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(13, 17, 23, 0.8);
    backdrop-filter: blur(16px) saturate(180%);
    border-bottom: 1px solid rgba(139, 92, 246, 0.1);
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.5);
    z-index: 1000;
    transition: all 0.3s ease;
}

.navbar-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0.8rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    text-decoration: none;
}

.logo img {
    height: 50px;
    width: auto;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-menu a {
    text-decoration: none;
    color: #ffffff;
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, rgba(139, 92, 246, 1), rgba(59, 130, 246, 1));
    transition: width 0.3s ease;
    box-shadow: 0 0 8px rgba(139, 92, 246, 0.5);
}

.nav-menu a:hover::after,
.nav-menu a.active::after {
    width: 100%;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: rgba(139, 92, 246, 1);
    text-shadow: 0 0 8px rgba(139, 92, 246, 0.3);
}

/* 语言切换器 */
.language-selector {
    position: relative;
    margin-left: 2rem;
}

.language-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.9rem;
    color: #ffffff;
}

.language-btn:hover {
    background: rgba(139, 92, 246, 0.1);
    border-color: rgba(139, 92, 246, 0.5);
    box-shadow: 0 0 12px rgba(139, 92, 246, 0.2);
}

.language-btn svg {
    stroke: currentColor;
}

.current-lang {
    font-weight: 500;
}

.language-dropdown {
    position: absolute;
    top: calc(100% + 0.5rem);
    right: 0;
    background: white;
    border-radius: 12px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
    min-width: 200px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    z-index: 1000;
    max-height: 400px;
    overflow-y: auto;
}

.language-dropdown.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.lang-option {
    display: flex;
    align-items: center;
    padding: 0.75rem 1.25rem;
    color: var(--text-dark);
    text-decoration: none;
    transition: all 0.2s ease;
    font-size: 0.95rem;
}

.lang-option:hover {
    background: var(--bg-light);
    color: var(--primary-color);
}

.lang-option:first-child {
    border-radius: 12px 12px 0 0;
}

.lang-option:last-child {
    border-radius: 0 0 12px 12px;
}

/* 移动端菜单按钮 */
.menu-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 5px;
}

.menu-toggle span {
    width: 25px;
    height: 3px;
    background: #ffffff;
    transition: all 0.3s ease;
}

/* Hero 区域 - GitHub 风格 */
.hero {
    margin-top: 70px;
    min-height: 500px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    color: var(--white);
    text-align: center;
    padding: 4rem 2rem;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(139, 92, 246, 0.15) 0%, transparent 70%);
    animation: heroGlow 6s ease-in-out infinite alternate;
    pointer-events: none;
}

@keyframes heroGlow {
    from {
        transform: translate(-50%, -50%) scale(0.8);
        opacity: 0.5;
    }
    to {
        transform: translate(-50%, -50%) scale(1.2);
        opacity: 0.8;
    }
}

.hero-content {
    max-width: 800px;
    position: relative;
    z-index: 1;
}

.hero h1 {
    font-size: 4rem;
    margin-bottom: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, #ffffff 0%, rgba(139, 92, 246, 1) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: fadeInUp 1s ease;
}

.hero p {
    font-size: 1.4rem;
    margin-bottom: 2.5rem;
    opacity: 0.9;
    color: rgba(255, 255, 255, 0.85);
    animation: fadeInUp 1s ease 0.2s both;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.btn {
    display: inline-block;
    padding: 1rem 2.5rem;
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.8) 0%, rgba(59, 130, 246, 0.8) 100%);
    color: #ffffff;
    text-decoration: none;
    border-radius: 12px;
    font-weight: 600;
    border: 1px solid rgba(139, 92, 246, 0.5);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    animation: fadeInUp 1s ease 0.4s both;
    box-shadow: 0 8px 24px rgba(139, 92, 246, 0.3);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.6s ease;
}

.btn:hover::before {
    left: 100%;
}

.btn:hover {
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 16px 40px rgba(139, 92, 246, 0.5),
                0 0 24px rgba(59, 130, 246, 0.4);
    border-color: rgba(139, 92, 246, 0.8);
}

/* 内容区域 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 3rem 2rem;
}

.section {
    padding: 4rem 0;
}

.section-title {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 3rem;
    position: relative;
    color: #ffffff;
}

.section-title::after {
    content: '';
    display: block;
    width: 80px;
    height: 4px;
    background: var(--gradient-1);
    margin: 1rem auto;
    border-radius: 2px;
}

/* 卡片网格 */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.card {
    background: rgba(22, 27, 34, 0.8);
    border: 1px solid rgba(139, 92, 246, 0.2);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(10px);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.card:hover {
    transform: translateY(-12px) scale(1.02);
    box-shadow: 0 20px 48px rgba(139, 92, 246, 0.3), 
                0 0 24px rgba(59, 130, 246, 0.2);
    border-color: rgba(139, 92, 246, 0.5);
}

.card-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    background: var(--bg-light);
}

.card-content {
    padding: 1.5rem;
}

.card-title {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: rgba(255, 255, 255, 0.95);
    font-weight: 600;
}

.card-text {
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.8;
}

/* 页脚 - GitHub 风格 */
.footer {
    background: rgba(13, 17, 23, 0.95);
    border-top: 1px solid rgba(139, 92, 246, 0.2);
    color: var(--white);
    padding: 3rem 2rem;
    text-align: center;
    backdrop-filter: blur(10px);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--white);
    text-decoration: none;
    opacity: 0.8;
    transition: opacity 0.3s ease;
}

.footer-links a:hover {
    opacity: 1;
}

.copyright {
    opacity: 0.7;
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.icp-number {
    opacity: 0.7;
    font-size: 0.85rem;
    margin-top: 0.5rem;
}

.icp-number a {
    color: var(--white);
    text-decoration: none;
    transition: opacity 0.3s ease;
}

.icp-number a:hover {
    opacity: 1;
    text-decoration: underline;
}

/* 动画 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 响应式设计 */
@media (max-width: 768px) {
    .logo img {
        height: 40px;
    }

    .navbar-container {
        padding: 0.6rem 1.5rem;
    }

    .menu-toggle {
        display: flex;
    }

    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: #000000;
        flex-direction: column;
        padding: 2rem;
        box-shadow: 0 5px 20px rgba(0, 0, 0, 0.5);
        display: none;
    }

    .nav-menu.active {
        display: flex;
    }

    .language-selector {
        margin-left: 1rem;
    }

    .language-btn {
        padding: 0.4rem 0.8rem;
        font-size: 0.85rem;
    }

    .language-dropdown {
        right: auto;
        left: 0;
    }

    .hero {
        min-height: 350px;
        padding: 2.5rem 2rem;
    }

    .hero h1 {
        font-size: 2.5rem;
    }

    .hero p {
        font-size: 1.1rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .card-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .logo img {
        height: 35px;
    }

    .navbar-container {
        padding: 0.5rem 1rem;
    }

    .hero {
        min-height: 300px;
        padding: 2rem 1rem;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .container {
        padding: 2rem 1rem;
    }
}

/* 图片保护样式 - 禁止选择和拖拽 */
img {
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    -webkit-user-drag: none;
    -khtml-user-drag: none;
    -moz-user-drag: none;
    -o-user-drag: none;
    pointer-events: auto;
}

/* 防止通过CSS背景图的方式绕过保护 */
*[style*="background-image"] {
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}