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

:root {
    /* Chrome 环保版颜色变量 */
    --primary-color: #4285f4;
    --secondary-color: #34a853;
    --accent-color: #fbbc05;
    --error-color: #ea4335;
    --dark-blue: #174ea6;
    --dark-green: #22863a;
    --light-green: #81c995;
    --background-color: #f8f9fa;
    --text-color: #202124;
    --text-secondary: #5f6368;
    --white: #ffffff;
    --border-radius: 8px;
    --transition: all 0.3s ease;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 20px rgba(0, 0, 0, 0.1);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
}

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

/* 导航栏样式 */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow);
    z-index: 1000;
    transition: var(--transition);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 0;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.chrome-logo {
    width: 40px;
    height: 40px;
    transition: var(--transition);
}

.chrome-logo:hover {
    transform: rotate(15deg) scale(1.1);
}

.logo-text {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
    align-items: center;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: var(--transition);
}

.nav-links a:hover {
    color: var(--secondary-color);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 0.375rem;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--text-color);
    transition: var(--transition);
}

/* 按钮样式 */
.btn-primary {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background: linear-gradient(135deg, var(--primary-color), var(--dark-blue));
    color: var(--white);
    border: none;
    border-radius: var(--border-radius);
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background-color: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    border-radius: var(--border-radius);
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
}

.btn-secondary:hover {
    background-color: var(--primary-color);
    color: var(--white);
}

/* 英雄区域样式 */
.hero {
    margin-top: 80px;
    padding: 6rem 0;
    background: linear-gradient(135deg, #f0f9ff 0%, #e6f7ee 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='100' height='100' viewBox='0 0 100 100' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M11 18c3.866 0 7-3.134 7-7s-3.134-7-7-7-7 3.134-7 7 3.134 7 7 7zm48 25c3.866 0 7-3.134 7-7s-3.134-7-7-7-7 3.134-7 7 3.134 7 7 7zm-43-7c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zm63 31c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zM34 90c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zm56-76c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zM12 86c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm28-65c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm23-11c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm-6 60c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm29 22c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zM32 63c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm57-13c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm-9-21c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM60 91c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM35 41c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM12 60c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2z' fill='%2334a853' fill-opacity='0.1' fill-rule='evenodd'/%3E%3C/svg%3E");
    opacity: 0.5;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 600px;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.hero-stats {
    display: flex;
    gap: 2rem;
    margin-bottom: 2rem;
}

.stat-item {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--secondary-color);
}

.stat-label {
    display: block;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.hero-cta {
    display: flex;
    gap: 1rem;
}

.hero-visual {
    position: absolute;
    right: 10%;
    top: 50%;
    transform: translateY(-50%);
}

.hero-chrome {
    width: 400px;
    height: 400px;
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0% {
        transform: translateY(0px) rotate(0deg);
    }
    50% {
        transform: translateY(-20px) rotate(5deg);
    }
    100% {
        transform: translateY(0px) rotate(0deg);
    }
}

/* 通用section样式 */
section {
    padding: 6rem 0;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: 4rem;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

/* 特性部分样式 */
.features {
    background-color: var(--white);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.feature-card {
    background-color: var(--background-color);
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid rgba(52, 168, 83, 0.1);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--secondary-color);
}

.feature-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background-color: rgba(52, 168, 83, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    transition: var(--transition);
}

.feature-card:hover .feature-icon {
    background-color: rgba(52, 168, 83, 0.2);
    transform: scale(1.1);
}

.feature-icon svg {
    width: 30px;
    height: 30px;
}

.feature-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.feature-description {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* 性能部分样式 */
.performance {
    background-color: var(--background-color);
}

.performance-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.performance-card {
    background-color: var(--white);
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow);
    transition: var(--transition);
    text-align: center;
}

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

.performance-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 1.5rem;
    transition: var(--transition);
}

.performance-card:hover .performance-icon {
    transform: scale(1.1) rotate(10deg);
}

.performance-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.performance-description {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* 安全部分样式 */
.security {
    background-color: var(--white);
}

.security-content {
    display: flex;
    justify-content: center;
}

.security-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    max-width: 900px;
}

.security-item {
    text-align: center;
    padding: 2rem;
    background-color: var(--background-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    transition: var(--transition);
}

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

.security-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 1.5rem;
    transition: var(--transition);
}

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

.security-item h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.security-item p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* 环保影响部分样式 */
.impact {
    background-color: var(--background-color);
}

.impact-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-bottom: 4rem;
}

.impact-stat {
    text-align: center;
    padding: 2rem;
    background-color: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    transition: var(--transition);
}

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

.impact-number {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: var(--secondary-color);
    margin-bottom: 0.5rem;
}

.impact-label {
    display: block;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.impact-visual {
    display: flex;
    justify-content: center;
    margin-top: 2rem;
}

.impact-visual svg {
    max-width: 100%;
    height: auto;
}

/* CTA部分样式 */
.cta {
    background: linear-gradient(135deg, var(--dark-green), var(--secondary-color));
    color: var(--white);
    padding: 6rem 0;
    text-align: center;
}

.cta-content h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.cta-content p {
    font-size: 1.125rem;
    margin-bottom: 2rem;
    opacity: 0.9;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.cta-content .btn-primary {
    background: var(--white);
    color: var(--secondary-color);
}

.cta-content .btn-primary:hover {
    background: var(--light-green);
    color: var(--white);
}

/* 下载页面样式 */
.download-hero {
    margin-top: 80px;
    padding: 4rem 0;
    background: linear-gradient(135deg, #f0f9ff 0%, #e6f7ee 100%);
}

.download-hero-content {
    text-align: center;
}

.download-hero-content h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.download-hero-content p {
    font-size: 1.125rem;
    color: var(--text-secondary);
}

.download-options {
    padding: 6rem 0;
    background-color: var(--white);
}

.platforms-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.platform-card {
    background-color: var(--background-color);
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow);
    transition: var(--transition);
    text-align: center;
    border: 1px solid rgba(52, 168, 83, 0.1);
}

.platform-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--secondary-color);
}

.platform-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 1.5rem;
    transition: var(--transition);
}

.platform-card:hover .platform-icon {
    transform: scale(1.1) rotate(10deg);
}

.platform-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.platform-card p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.platform-btn {
    display: block;
    margin-bottom: 1.5rem;
}

.platform-details {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.system-requirements {
    padding: 6rem 0;
    background-color: var(--background-color);
}

.requirements-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.requirement-section {
    background-color: var(--white);
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow);
}

.requirement-section h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: var(--text-color);
    border-bottom: 2px solid var(--secondary-color);
    padding-bottom: 0.5rem;
}

.requirement-section ul {
    list-style: none;
}

.requirement-section li {
    padding: 0.5rem 0;
    color: var(--text-secondary);
    position: relative;
    padding-left: 1.5rem;
}

.requirement-section li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--secondary-color);
    font-weight: bold;
}

.faq {
    padding: 6rem 0;
    background-color: var(--white);
}

.faq-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.faq-item {
    background-color: var(--background-color);
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

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

.faq-question {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.faq-answer {
    color: var(--text-secondary);
    line-height: 1.6;
}

.download-cta {
    padding: 4rem 0;
    background: linear-gradient(135deg, var(--dark-green), var(--secondary-color));
    color: var(--white);
    text-align: center;
}

.download-cta-content h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.download-cta-content p {
    font-size: 1.125rem;
    margin-bottom: 2rem;
    opacity: 0.9;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.download-cta-content .btn-primary {
    background: var(--white);
    color: var(--secondary-color);
}

.download-cta-content .btn-primary:hover {
    background: var(--light-green);
    color: var(--white);
}

/* 页脚样式 */
.footer {
    background-color: var(--text-color);
    color: var(--white);
    padding: 4rem 0 2rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: var(--white);
}

.footer-section ul {
    list-style: none;
}

.footer-section li {
    margin-bottom: 0.75rem;
}

.footer-section a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: var(--transition);
}

.footer-section a:hover {
    color: var(--light-green);
}

.footer-logo .logo-text {
    color: var(--white);
}

.footer-description {
    color: rgba(255, 255, 255, 0.7);
    margin-top: 1rem;
    line-height: 1.6;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 2rem;
    text-align: center;
    color: rgba(255, 255, 255, 0.7);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 80px;
        left: 0;
        right: 0;
        background-color: var(--white);
        flex-direction: column;
        align-items: center;
        padding: 2rem 0;
        gap: 1rem;
        box-shadow: var(--shadow);
        transform: translateY(-150%);
        transition: var(--transition);
        opacity: 0;
        visibility: hidden;
    }

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

    .nav-toggle {
        display: flex;
    }

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

    .hero-visual {
        display: none;
    }

    .hero-content {
        max-width: 100%;
        text-align: center;
    }

    .hero-stats {
        justify-content: center;
    }

    .hero-cta {
        justify-content: center;
    }

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

    .cta-content h2 {
        font-size: 2rem;
    }

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

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }

    .section-title {
        font-size: 1.75rem;
    }

    .cta-content h2 {
        font-size: 1.75rem;
    }

    .download-hero-content h1 {
        font-size: 1.75rem;
    }

    .hero-stats {
        flex-direction: column;
        align-items: center;
        gap: 1rem;
    }

    .hero-cta {
        flex-direction: column;
        align-items: center;
        gap: 1rem;
    }

    .btn-primary,
    .btn-secondary {
        width: 100%;
        text-align: center;
    }
}

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

.fade-in-up {
    animation: fadeInUp 0.6s ease-out forwards;
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
}

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

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

::-webkit-scrollbar-thumb:hover {
    background: var(--dark-green);
}

/* 无障碍样式 */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* 高对比度模式支持 */
@media (prefers-contrast: high) {
    :root {
        --background-color: #ffffff;
        --text-color: #000000;
        --text-secondary: #333333;
        --shadow: 0 4px 6px rgba(0, 0, 0, 0.2);
    }
}

/* 深色模式支持 */
@media (prefers-color-scheme: dark) {
    :root {
        --background-color: #202124;
        --text-color: #e8eaed;
        --text-secondary: #9aa0a6;
        --white: #303134;
    }

    .header {
        background-color: rgba(32, 33, 36, 0.95);
    }

    .nav-links {
        background-color: var(--white);
    }

    .hero {
        background: linear-gradient(135deg, #2d3748 0%, #274035 100%);
    }

    .download-hero {
        background: linear-gradient(135deg, #2d3748 0%, #274035 100%);
    }

    .feature-card,
    .performance-card,
    .security-item,
    .impact-stat,
    .platform-card,
    .requirement-section,
    .faq-item {
        background-color: var(--white);
        color: var(--text-color);
    }

    .feature-description,
    .performance-description,
    .security-item p,
    .impact-label,
    .platform-card p,
    .platform-details,
    .requirement-section li,
    .faq-answer {
        color: var(--text-secondary);
    }
}

/* 打印样式 */
@media print {
    .header,
    .nav-toggle,
    .btn-primary,
    .btn-secondary {
        display: none;
    }

    body {
        background-color: var(--white);
        color: var(--text-color);
    }

    section {
        margin: 0;
        padding: 2rem 0;
    }
}