/* 现代化浅色主题样式 - Bear加速器 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    font-family: 'PingFang SC', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    color: #1a1a1a;
    background: #ffffff;
    overflow-x: hidden;
    line-height: 1.6;
}

a {
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
}

img {
    display: block;
    max-width: 100%;
    height: auto;
}

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

::-webkit-scrollbar-track {
    background: #f5f5f5;
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(45deg, #667eea, #764ba2);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(45deg, #764ba2, #667eea);
}

/* 头部导航 */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    padding: 10px 0;
    transition: all 0.3s ease;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.05);
}

.header.scrolled {
    background: rgba(255, 255, 255, 0.98);
    padding: 15px 0;
}

.header .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 40px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo-container {
    position: relative;
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    padding: 8px;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.logo-container:hover {
    background: rgba(0, 0, 0, 0.05);
    backdrop-filter: blur(10px);
}

.logo-container svg {
    width: 32px;
    height: 32px;
    transition: all 0.3s ease;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.1));
    animation: logoFloat 3s ease-in-out infinite;
}

.logo-container svg:hover {
    transform: scale(1.1) rotate(5deg);
    filter: drop-shadow(0 4px 8px rgba(27, 109, 193, 0.3));
    animation-play-state: paused;
}

@keyframes logoFloat {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-2px);
    }
}

.header .logo {
    width: 120px;
    max-height: 40px;
    object-fit: cover;
    filter: brightness(1.2);
    transition: all 0.3s ease;
    cursor: pointer;
}

.header .logo:hover {
    transform: scale(1.05);
    filter: brightness(1.4);
}

.logo-container:hover .logo {
    transform: scale(1.05);
    filter: brightness(1.4);
}

.header-nav {
    display: flex;
    gap: 40px;
    align-items: center;
}

.header-nav a {
    color: #1a1a1a;
    font-weight: 500;
    font-size: 16px;
    position: relative;
    padding: 8px 16px;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.header-nav a:hover,
.header-nav a.active {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: #ffffff;
    transform: translateY(-2px);
}

/* 英雄区域 */
.hero {
    position: relative;
    min-height: 100vh;
    background: linear-gradient(135deg, #f8f9fa 0%, #e3f2fd 50%, #e8eaf6 100%);
    display: flex;
    align-items: center;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 80%, rgba(102, 126, 234, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(118, 75, 162, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(102, 126, 234, 0.1) 0%, transparent 50%);
    animation: gradientShift 8s ease-in-out infinite;
}

@keyframes gradientShift {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.8; }
}

.hero-inner {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
    position: relative;
    z-index: 2;
}

.hero-left {
    animation: slideInLeft 1s ease-out;
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, #667eea, #764ba2, #f093fb);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: #666666;
    margin-bottom: 40px;
    font-weight: 300;
}

.hero-icons {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-bottom: 40px;
}

.hero-icon {
    text-align: center;
    transition: all 0.3s ease;
    position: relative;
}

.hero-icon:hover {
    transform: translateY(-5px);
}

.hero-icon img {
    width: 40px;
    height: 40px;
    margin: 0 auto 12px;
    filter: brightness(1.2);
    transition: all 0.3s ease;
}

.hero-icon:hover img {
    transform: scale(1.1);
    filter: brightness(1.4);
}

.hero-icon span {
    display: block;
    color: #333333;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.3s ease;
}

.hero-icon:hover span {
    color: #667eea;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: #ffffff;
    padding: 16px 32px;
    border-radius: 50px;
    font-weight: 600;
    font-size: 16px;
    border: none;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    transition: all 0.3s ease;
    box-shadow: 0 10px 30px rgba(102, 126, 234, 0.3);
}

.btn-primary::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 0.5s ease;
}

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

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 40px rgba(102, 126, 234, 0.4);
}

.hero-device {
    position: relative;
    animation: slideInRight 1s ease-out;
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.hero-device .notebook {
    width: 100%;
    max-width: 500px;
    margin: 0 auto;
    filter: drop-shadow(0 20px 40px rgba(0, 0, 0, 0.3));
    animation: float 6s ease-in-out infinite;
}

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

/* 功能特性区域 */
.features-bg {
    background: linear-gradient(180deg, #f8f9fa 0%, #ffffff 100%);
    padding: 120px 0;
}

.section {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 40px;
}

.features-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 60px 40px;
}

.feature-row {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    transition: all 0.3s ease;
}

.feature-row:hover {
    transform: translateY(-5px);
}

.feature-text {
    width: 100%;
}

.feature-text h3 {
    font-size: 1.8rem;
    font-weight: 700;
    background: linear-gradient(135deg, #667eea, #764ba2);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 15px;
}

.feature-text p {
    font-size: 1rem;
    color: #666666;
    line-height: 1.8;
    max-width: 500px;
    margin: 0 auto;
}

.feature-illustration {
    position: relative;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 400px;
    margin: 20px auto;
}

.feature-illustration img {
    width: 100%;
    height: auto;
    transition: transform 0.3s ease;
}

.feature-row:hover .feature-illustration img {
    transform: scale(1.05);
}

/* 用户评价区域 */
.reviews {
    background: linear-gradient(135deg, #f5f7fa 0%, #ffffff 100%);
    padding: 120px 0;
    text-align: center;
}

.reviews h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 60px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.review-center {
    max-width: 800px;
    margin: 0 auto 60px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    border: 1px solid rgba(102, 126, 234, 0.2);
    padding: 40px;
    border-radius: 20px;
    font-size: 1.2rem;
    color: #ffffff;
    position: relative;
    overflow: hidden;
    box-shadow: 0 10px 40px rgba(102, 126, 234, 0.2);
}

.review-center::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, #667eea, #764ba2, #f093fb);
}

.avatars {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 30px;
    flex-wrap: wrap;
}

.avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: linear-gradient(135deg, #667eea, #764ba2);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    transition: all 0.3s ease;
    cursor: pointer;
}

.avatar img {
    width: 70px;
    height: 70px;
    border-radius: 50%;
    object-fit: cover;
}

.avatar.active {
    transform: scale(1.2);
    box-shadow: 0 0 30px rgba(102, 126, 234, 0.5);
}

.avatar.active span {
    position: absolute;
    bottom: -30px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 12px;
    color: #667eea;
    font-weight: 600;
}

/* 下载区域 */
.download {
    background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
    padding: 120px 0;
    text-align: center;
}

.download h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 60px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.platform-boxes {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    max-width: 1000px;
    margin: 0 auto;
}

.platform {
    background: #ffffff;
    border: 1px solid rgba(0, 0, 0, 0.1);
    border-radius: 20px;
    padding: 40px 20px;
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
}

.platform::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: left 0.5s ease;
}

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

.platform:hover {
    transform: translateY(-10px);
    background: #f8f9fa;
    border-color: rgba(102, 126, 234, 0.5);
    box-shadow: 0 20px 40px rgba(102, 126, 234, 0.2);
}

.platform img {
    width: 60px;
    height: 60px;
    margin: 0 auto 20px;
    filter: brightness(1.2);
}

.platform span {
    display: block;
    color: #333333;
    font-size: 16px;
    font-weight: 600;
}

/* 页脚 */
.footer {
    background: #f8f9fa;
    padding: 80px 0 40px;
    border-top: 1px solid rgba(0, 0, 0, 0.1);
}

.footer-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 40px;
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 80px;
    align-items: start;
}

.footer-brand img {
    height: 60px;
    margin-bottom: 20px;
    filter: brightness(1.2);
}

.copyright {
    color: #666;
    font-size: 14px;
}

.footer-col h4 {
    color: #1a1a1a;
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 20px;
}

.footer-col ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-col a {
    color: #999;
    font-size: 14px;
    transition: color 0.3s ease;
}

.footer-col a:hover {
    color: #667eea;
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .hero-inner {
        grid-template-columns: 1fr;
        gap: 60px;
        text-align: center;
    }
    
    .hero-title {
        font-size: 3rem;
    }
    
    .features-list {
        grid-template-columns: 1fr;
        gap: 60px 30px;
    }
}

@media (max-width: 768px) {
    .header .container {
        padding: 0 20px;
    }
    
    .logo-container {
        gap: 6px;
    }
    
    .logo-container svg {
        width: 28px;
        height: 28px;
    }
    
    .header .logo {
        height: 50px;
        max-width: 150px;
    }
    
    .header-nav {
        display: none;
    }
    
    .hero {
        padding-top: 100px;
    }
    
    .hero-inner {
        padding: 0 20px;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-icons {
        grid-template-columns: repeat(3, 1fr);
        gap: 10px;
    }
    
    .hero-icon img {
        width: 30px;
        height: 30px;
    }
    
    .hero-icon span {
        font-size: 11px;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .section {
        padding: 0 20px;
    }
    
    .features-list {
        gap: 50px 20px;
    }
    
    .feature-text h3 {
        font-size: 1.5rem;
    }
    
    .feature-text p {
        font-size: 0.9rem;
    }
    
    .feature-illustration {
        max-width: 300px;
    }
    
    .platform-boxes {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }
    
    .footer-inner {
        grid-template-columns: 1fr;
        gap: 40px;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .hero-icons {
        gap: 8px;
    }
    
    .hero-icon img {
        width: 28px;
        height: 28px;
    }
    
    .hero-icon span {
        font-size: 10px;
    }
    
    .platform-boxes {
        grid-template-columns: 1fr;
    }
    
    .avatars {
        gap: 15px;
    }
    
    .avatar {
        width: 60px;
        height: 60px;
    }
    
    .avatar img {
        width: 50px;
        height: 50px;
    }
}

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

.fade-in-up {
    animation: fadeInUp 0.8s ease-out;
}

/* 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: #667eea;
    animation: spin 1s ease-in-out infinite;
}

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