/* 豆包AI助手 - 自定义样式 */

/* 全局变量 */
:root {
    --primary-color: #2563eb;
    --secondary-color: #1e40af;
    --accent-color: #f59e0b;
    --text-dark: #1f2937;
    --text-light: #6b7280;
    --bg-light: #f8fafc;
    --bg-dark: #0f172a;
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
}

/* 基础重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: #ffffff;
    overflow-x: hidden;
}

/* 导航栏样式 */
.navbar {
    backdrop-filter: blur(10px);
    background: rgba(37, 99, 235, 0.95) !important;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    transition: all 0.3s ease;
}

.navbar-brand {
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.navbar-brand i {
    font-size: 1.8rem;
}

.nav-link {
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
}

.nav-link:hover {
    color: var(--accent-color) !important;
    transform: translateY(-2px);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--accent-color);
    transition: all 0.3s ease;
    transform: translateX(-50%);
}

.nav-link:hover::after {
    width: 100%;
}

/* 英雄区域 */
.hero-section {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 50%, #1e3a8a 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.hero-section .container {
    position: relative;
    z-index: 1;
}

.hero-bg-animation {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    background: 
        radial-gradient(circle at 20% 80%, rgba(120, 119, 198, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255, 119, 198, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(120, 219, 255, 0.2) 0%, transparent 50%);
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(1deg); }
}

.hero-content h1 {
    font-size: 3.5rem;
    line-height: 1.2;
    margin-bottom: 1.5rem;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.hero-content .lead {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.hero-buttons .btn {
    padding: 0.75rem 2rem;
    font-size: 1.1rem;
    font-weight: 600;
    border-radius: 50px;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-md);
}

.hero-buttons .btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl);
}

.hero-stats {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-radius: 15px;
    padding: 2rem;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.hero-stats h3 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.hero-image img {
    animation: pulse 2s ease-in-out infinite;
    max-height: 500px;
    object-fit: cover;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

/* 功能卡片 */
.feature-card {
    background: white;
    border-radius: 20px;
    padding: 2.5rem;
    text-align: center;
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
    transition: left 0.5s ease;
}

.feature-card:hover::before {
    left: 100%;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-color);
}

.feature-icon {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    font-size: 2rem;
    color: white;
    position: relative;
}

.feature-icon::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: inherit;
    opacity: 0.3;
    animation: ripple 2s infinite;
}

@keyframes ripple {
    0% { transform: scale(1); opacity: 0.3; }
    100% { transform: scale(1.5); opacity: 0; }
}

.feature-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.feature-description {
    color: var(--text-light);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.feature-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: center;
}

.feature-tags .badge {
    font-size: 0.8rem;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-weight: 500;
}

/* 翻译和搜索区域 */
.section-image img {
    border-radius: 20px;
    box-shadow: var(--shadow-lg);
    transition: all 0.3s ease;
}

.section-image img:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-xl);
}

.section-content h2 {
    font-size: 2.5rem;
    line-height: 1.3;
    margin-bottom: 1.5rem;
}

.translation-features .feature-item {
    display: flex;
    align-items: center;
    padding: 1rem;
    background: var(--bg-light);
    border-radius: 15px;
    transition: all 0.3s ease;
}

.translation-features .feature-item:hover {
    background: var(--primary-color);
    color: white;
    transform: translateX(10px);
}

.language-tags .badge {
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    background: transparent;
    font-weight: 600;
    transition: all 0.3s ease;
}

.language-tags .badge:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

.capability-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 1.5rem;
    background: white;
    border-radius: 15px;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

.capability-item:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-5px);
}

.capability-icon {
    width: 60px;
    height: 60px;
    border-radius: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: white;
    flex-shrink: 0;
}

.capability-content h5 {
    font-weight: 700;
    margin-bottom: 0.5rem;
}

/* 下载区域 */
.download-card {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 2rem;
    text-align: center;
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: all 0.3s ease;
}

.download-card:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.download-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: var(--accent-color);
}

.download-card h5 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.download-card .btn {
    border-radius: 50px;
    font-weight: 600;
    padding: 0.75rem 1.5rem;
    transition: all 0.3s ease;
}

.download-features .feature-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 15px;
    transition: all 0.3s ease;
}

.download-features .feature-item:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-5px);
}

.download-features .feature-item i {
    font-size: 1.5rem;
    color: var(--accent-color);
}

/* 页脚 */
footer {
    background: var(--bg-dark) !important;
}

.footer-section h5,
.footer-section h6 {
    color: white;
    font-weight: 700;
}

.footer-section a {
    transition: all 0.3s ease;
    position: relative;
}

.footer-section a:hover {
    color: var(--accent-color) !important;
    transform: translateX(5px);
}

.social-links a {
    font-size: 1.5rem;
    transition: all 0.3s ease;
}

.social-links a:hover {
    color: var(--accent-color) !important;
    transform: translateY(-3px);
}

.news-hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    margin-top: 66px;
}

.category-pill {
    display: inline-block;
    padding: 0.5rem 1rem;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    border-radius: 999px;
    text-decoration: none;
    font-weight: 600;
}

.category-pill.active, .category-pill:hover {
    background: var(--primary-color);
    color: #fff;
}

.news-card {
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: transform .2s ease, box-shadow .2s ease;
}

.news-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}

.news-thumb {
    width: 100%;
    height: 180px;
    object-fit: cover;
}

.news-body { padding: 1.25rem; }
.news-title { font-weight: 700; margin-bottom: .5rem; }
.news-excerpt { color: var(--text-light); }
.news-meta { display:flex; justify-content:space-between; color: var(--text-light); font-size:.9rem; margin: .75rem 0 1rem; }

.article-header h1 { font-size: 2rem; }
.breadcrumb .breadcrumb-item + .breadcrumb-item::before { content: "/"; }

/* 回到顶部按钮 */
#backToTop {
    position: fixed;
    bottom: 30px;
    right: 30px;
    display: none;
    z-index: 1000;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-lg);
}

#backToTop:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .hero-content h1 {
        font-size: 2.5rem;
    }
    
    .hero-content .lead {
        font-size: 1.1rem;
    }
    
    .section-content h2 {
        font-size: 2rem;
    }
    
    .feature-card {
        padding: 2rem;
    }
    
    .hero-stats {
        padding: 1.5rem;
    }
    
    .hero-stats h3 {
        font-size: 2rem;
    }
    
    .download-card {
        margin-bottom: 1rem;
    }
    
    .capability-item {
        flex-direction: column;
        text-align: center;
    }
    
    .language-tags {
        justify-content: center;
    }
}

@media (max-width: 576px) {
    .hero-content h1 {
        font-size: 2rem;
    }
    
    .hero-buttons .btn {
        display: block;
        width: 100%;
        margin-bottom: 1rem;
    }
    
    .feature-card {
        padding: 1.5rem;
    }
    
    .hero-stats {
        padding: 1rem;
    }
    
    .hero-stats h3 {
        font-size: 1.5rem;
    }
}

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

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes zoomIn {
    from {
        opacity: 0;
        transform: scale(0.8);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* 自定义滚动条 */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-light);
}

::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--secondary-color);
}

/* 加载动画 */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s ease-in-out infinite;
}

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

/* 高对比度模式支持 */
@media (prefers-contrast: high) {
    .hero-section {
        background: var(--primary-color);
    }
    
    .feature-card {
        border: 2px solid var(--text-dark);
    }
    
    .download-card {
        border: 2px solid white;
    }
}

/* 减少动画偏好支持 */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .hero-bg-animation {
        animation: none;
    }
    
    .feature-icon::after {
        animation: none;
    }
    
    .hero-image img {
        animation: none;
    }
}

/* 深色模式支持 */
@media (prefers-color-scheme: dark) {
    :root {
        --text-dark: #f9fafb;
        --text-light: #d1d5db;
        --bg-light: #1f2937;
        --border-color: #374151;
    }
    
    body {
        background-color: #111827;
        color: var(--text-dark);
    }
    
    .feature-card {
        background: #1f2937;
        border-color: #374151;
    }
    
    .capability-item {
        background: #1f2937;
    }
    
    .translation-features .feature-item {
        background: #374151;
    }
    
    .translation-features .feature-item:hover {
        background: var(--primary-color);
    }
}