/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Poppins', 'Microsoft YaHei', sans-serif;
}

:root {
    --primary-color: #4285f4;
    --secondary-color: #34a853;
    --accent-red: #ea4335;
    --accent-yellow: #fbbc05;
    --text-primary: #202124;
    --text-secondary: #5f6368;
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-sidebar: #f1f3f4;
    --border-color: #dadce0;
    --shadow: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
    --shadow-hover: 0 10px 20px rgba(0,0,0,0.1);
    --shadow-large: 0 20px 40px rgba(0,0,0,0.15);
    --transition: all 0.3s ease;
}

[data-theme="dark"] {
    --primary-color: #8ab4f8;
    --secondary-color: #81c995;
    --accent-red: #f28b82;
    --accent-yellow: #fdd663;
    --text-primary: #e8eaed;
    --text-secondary: #9aa0a6;
    --bg-primary: #202124;
    --bg-secondary: #292a2d;
    --bg-sidebar: #2d2e31;
    --border-color: #3c4043;
    --shadow: 0 1px 3px rgba(0,0,0,0.3), 0 1px 2px rgba(0,0,0,0.5);
    --shadow-hover: 0 10px 20px rgba(0,0,0,0.4);
    --shadow-large: 0 20px 40px rgba(0,0,0,0.5);
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    transition: var(--transition);
    min-height: 100vh;
    overflow-x: hidden;
}

/* 导航栏 */
.navbar {
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    padding: 12px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-area {
    display: flex;
    align-items: center;
}

.logo {
    font-size: 24px;
    font-weight: 800;
    display: flex;
    align-items: center;
}

.logo-blue { color: #4285f4; }
.logo-red { color: #ea4335; }
.logo-yellow { color: #fbbc05; }
.logo-green { color: #34a853; }

.logo-text {
    margin-left: 8px;
    color: var(--text-primary);
    font-weight: 600;
}

.nav-download-btn {
    background: var(--primary-color);
    color: white;
    padding: 10px 20px;
    border-radius: 24px;
    text-decoration: none;
    font-weight: 600;
    margin-right: 15px;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-download-btn:hover {
    background: #3367d6;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(66, 133, 244, 0.4);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

.nav-btn {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

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

/* 英雄区域 */
.hero-section {
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    padding: 60px 20px 120px;
    position: relative;
    overflow: hidden;
}

.hero-container {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-content {
    position: relative;
    z-index: 2;
}

.hero-badge {
    display: inline-block;
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 8px 20px;
    border-radius: 30px;
    font-weight: 600;
    margin-bottom: 25px;
    font-size: 14px;
    box-shadow: 0 4px 15px rgba(66, 133, 244, 0.3);
}

.hero-title {
    font-size: 48px;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 20px;
}

.chrome-gradient {
    background: linear-gradient(45deg, #4285f4, #ea4335, #fbbc05, #34a853);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    display: inline-block;
}

.hero-subtitle {
    font-size: 20px;
    color: var(--text-secondary);
    margin-bottom: 40px;
    line-height: 1.6;
}

.highlight {
    color: var(--primary-color);
    font-weight: 600;
}

/* 英雄下载区域 */
.hero-download-area {
    margin-bottom: 50px;
}

.hero-download-btn {
    display: flex;
    align-items: center;
    background: linear-gradient(45deg, #4285f4, #1a73e8);
    color: white;
    text-decoration: none;
    border-radius: 16px;
    padding: 25px 35px;
    margin-bottom: 25px;
    box-shadow: 0 15px 35px rgba(66, 133, 244, 0.4);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    border: none;
    cursor: pointer;
}

.hero-download-btn:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(66, 133, 244, 0.6);
    background: linear-gradient(45deg, #1a73e8, #0d62d9);
}

.hero-download-btn:active {
    transform: translateY(0);
}

.download-icon {
    font-size: 32px;
    margin-right: 20px;
}

.download-text {
    flex: 1;
    text-align: left;
}

.download-main {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 5px;
}

.download-sub {
    font-size: 16px;
    opacity: 0.9;
}

.download-arrow {
    font-size: 24px;
    opacity: 0.8;
}

.download-stats-hero {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 30px;
    margin-bottom: 20px;
}

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

.stat-number {
    font-size: 28px;
    font-weight: 800;
    color: var(--primary-color);
    margin-bottom: 5px;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 14px;
}

.stat-divider {
    width: 1px;
    height: 30px;
    background: var(--border-color);
}

.download-note-hero {
    text-align: center;
    color: var(--text-secondary);
    font-size: 16px;
}

.download-note-hero i {
    margin: 0 8px;
    color: var(--primary-color);
}

/* 平台快速选择 */
.platform-quick {
    margin-top: 30px;
}

.platform-quick p {
    color: var(--text-secondary);
    margin-bottom: 15px;
    font-size: 16px;
}

.platform-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.platform-badge {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    padding: 10px 20px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

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

.platform-badge i {
    font-size: 18px;
}

/* 英雄区域视觉元素 */
.hero-visual {
    position: relative;
}

.browser-mockup {
    background: var(--bg-primary);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-large);
    border: 1px solid var(--border-color);
    transform: perspective(1000px) rotateY(-5deg);
    transition: var(--transition);
}

.browser-mockup:hover {
    transform: perspective(1000px) rotateY(0deg);
}

.browser-header {
    background: var(--bg-sidebar);
    padding: 15px 20px;
    display: flex;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
}

.browser-dots {
    display: flex;
    gap: 8px;
    margin-right: 15px;
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.dot.red { background: #ff5f56; }
.dot.yellow { background: #ffbd2e; }
.dot.green { background: #27ca3f; }

.browser-url-bar {
    flex: 1;
    background: var(--bg-primary);
    padding: 10px 15px;
    border-radius: 8px;
    font-size: 14px;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    margin-right: 15px;
}

.browser-actions {
    color: var(--primary-color);
    font-size: 20px;
}

.browser-content {
    padding: 40px 30px;
}

.mockup-content {
    text-align: center;
}

.chrome-logo-large {
    margin-bottom: 30px;
}

.chrome-circle {
    width: 120px;
    height: 120px;
    position: relative;
    margin: 0 auto;
}

.chrome-segment {
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    clip-path: polygon(50% 50%, 100% 50%, 100% 100%, 50% 100%);
}

.chrome-segment.blue {
    background: #4285f4;
    transform: rotate(0deg);
}

.chrome-segment.red {
    background: #ea4335;
    transform: rotate(120deg);
}

.chrome-segment.yellow {
    background: #fbbc05;
    transform: rotate(240deg);
}

.chrome-segment.green {
    background: #34a853;
    transform: rotate(60deg);
    clip-path: polygon(50% 50%, 100% 0%, 100% 50%, 50% 50%);
}

.mockup-content h3 {
    margin-bottom: 20px;
    color: var(--text-primary);
}

.download-progress-mock {
    margin-bottom: 20px;
}

.progress-bar {
    height: 10px;
    background: var(--bg-secondary);
    border-radius: 5px;
    overflow: hidden;
    margin-bottom: 10px;
}

.progress-fill {
    height: 100%;
    width: 85%;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 5px;
    animation: progress-pulse 2s infinite;
}

@keyframes progress-pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.8; }
}

.progress-text {
    color: var(--text-secondary);
    font-size: 14px;
}

.download-speed {
    color: var(--primary-color);
    font-weight: 500;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.floating-elements {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    pointer-events: none;
    z-index: 1;
}

.floating-element {
    position: absolute;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--color);
    opacity: 0.2;
    animation: float-around 15s infinite ease-in-out;
    animation-delay: var(--delay);
}

@keyframes float-around {
    0%, 100% {
        transform: translate(0, 0) scale(1);
    }
    25% {
        transform: translate(30px, -40px) scale(1.1);
    }
    50% {
        transform: translate(-20px, 20px) scale(0.9);
    }
    75% {
        transform: translate(40px, 30px) scale(1.05);
    }
}

/* 下载浮动条 */
.download-floating-bar {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 15px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 100;
}

.floating-content {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 500;
}

.floating-download-btn {
    background: white;
    color: var(--primary-color);
    padding: 10px 25px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 8px;
}

.floating-download-btn:hover {
    background: rgba(255, 255, 255, 0.9);
    transform: translateY(-2px);
}

/* 主内容布局 */
.main-content {
    display: flex;
    max-width: 1400px;
    margin: -60px auto 40px;
    padding: 0 20px;
    gap: 20px;
    position: relative;
    z-index: 10;
}

/* 侧边栏 */
.sidebar {
    width: 300px;
    background-color: var(--bg-sidebar);
    border-radius: 16px;
    padding: 25px;
    box-shadow: var(--shadow);
    flex-shrink: 0;
    position: sticky;
    top: 100px;
    height: fit-content;
}

.sidebar-header {
    text-align: center;
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--border-color);
}

.clock {
    font-size: 32px;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 5px;
}

.date {
    color: var(--text-secondary);
    font-size: 14px;
}

.sidebar-section {
    margin-bottom: 25px;
}

.sidebar-section h3 {
    font-size: 16px;
    margin-bottom: 15px;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.sidebar-section h3 i {
    color: var(--primary-color);
}

.search-box {
    display: flex;
    background: var(--bg-primary);
    border-radius: 24px;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.search-box input {
    flex: 1;
    padding: 12px 16px;
    border: none;
    background: transparent;
    color: var(--text-primary);
    outline: none;
}

.search-box button {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 0 18px;
    cursor: pointer;
    transition: var(--transition);
}

.search-box button:hover {
    background: #3367d6;
}

.quick-links {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

.quick-link {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 12px;
    background: var(--bg-primary);
    border-radius: 8px;
    text-decoration: none;
    color: var(--text-primary);
    transition: var(--transition);
    border: 1px solid var(--border-color);
    cursor: pointer;
}

.quick-link:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-hover);
    border-color: var(--primary-color);
}

.quick-link img {
    width: 40px;
    height: 40px;
    object-fit: cover;
    border-radius: 8px;
    margin-bottom: 8px;
}

.quick-link span {
    font-size: 13px;
    font-weight: 500;
}

.shopping-item {
    background: var(--bg-primary);
    border-radius: 8px;
    padding: 15px;
    margin-bottom: 15px;
    border: 1px solid var(--border-color);
}

.shopping-title {
    font-weight: 600;
    margin-bottom: 5px;
}

.shopping-price {
    color: var(--accent-red);
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 10px;
}

.shopping-btn {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 4px;
    cursor: pointer;
    width: 100%;
    transition: var(--transition);
}

.shopping-btn:hover {
    background: #3367d6;
}

.sidebar-download-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 18px;
    border-radius: 12px;
    text-decoration: none;
    text-align: center;
    transition: var(--transition);
    box-shadow: 0 8px 20px rgba(66, 133, 244, 0.3);
}

.sidebar-download-btn:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 25px rgba(66, 133, 244, 0.5);
}

.sidebar-download-btn i {
    font-size: 28px;
    margin-bottom: 10px;
}

.sidebar-download-btn span {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 5px;
}

.sidebar-download-btn small {
    opacity: 0.9;
    font-size: 12px;
}

/* 主要内容区域 */
.content-area {
    flex: 1;
    background: var(--bg-primary);
    border-radius: 16px;
    padding: 40px;
    box-shadow: var(--shadow);
}

/* 功能特性 */
.features-section {
    margin-bottom: 50px;
}

.features-section h2 {
    font-size: 32px;
    margin-bottom: 30px;
    text-align: center;
    color: var(--text-primary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 25px;
}

.feature-card {
    background: var(--bg-secondary);
    border-radius: 16px;
    padding: 30px;
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

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

.highlight-card {
    background: linear-gradient(135deg, rgba(66, 133, 244, 0.1), rgba(52, 168, 83, 0.1));
    border-color: var(--primary-color);
}

.feature-icon {
    width: 70px;
    height: 70px;
    border-radius: 50%;
    background: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 28px;
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 20px;
    margin-bottom: 15px;
    color: var(--text-primary);
}

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

/* 主要下载区域 */
.download-main-section {
    margin-bottom: 50px;
}

.download-card {
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
    border-radius: 20px;
    padding: 40px;
    border: 2px solid var(--border-color);
    box-shadow: var(--shadow-large);
}

.download-header {
    text-align: center;
    margin-bottom: 40px;
}

.download-header h2 {
    font-size: 36px;
    margin-bottom: 10px;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
}

.download-header p {
    font-size: 18px;
    color: var(--text-secondary);
}

.download-platforms {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-bottom: 40px;
}

.platform-card {
    display: flex;
    align-items: center;
    background: var(--bg-primary);
    border-radius: 12px;
    padding: 25px;
    border: 2px solid var(--border-color);
    transition: var(--transition);
}

.platform-card.active {
    border-color: var(--primary-color);
    box-shadow: 0 5px 15px rgba(66, 133, 244, 0.2);
}

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

.platform-icon {
    width: 60px;
    height: 60px;
    border-radius: 12px;
    background: var(--bg-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 25px;
    font-size: 28px;
    color: var(--primary-color);
}

.platform-info {
    flex: 1;
}

.platform-info h4 {
    font-size: 20px;
    margin-bottom: 5px;
    color: var(--text-primary);
}

.platform-info p {
    color: var(--text-secondary);
    margin-bottom: 8px;
    font-size: 14px;
}

.platform-size {
    display: inline-block;
    background: var(--bg-secondary);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    color: var(--text-secondary);
}

.platform-action {
    margin-left: 20px;
}

.platform-download-btn {
    background: var(--primary-color);
    color: white;
    padding: 12px 30px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    display: inline-block;
}

.platform-download-btn:hover {
    background: #3367d6;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(66, 133, 244, 0.4);
}

.download-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 30px;
    border-top: 1px solid var(--border-color);
}

.version-info p {
    color: var(--text-secondary);
    margin-bottom: 5px;
    font-size: 14px;
}

.primary-download-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    background: linear-gradient(45deg, #4285f4, #1a73e8);
    color: white;
    padding: 20px 40px;
    border-radius: 16px;
    text-decoration: none;
    transition: var(--transition);
    box-shadow: 0 10px 25px rgba(66, 133, 244, 0.4);
    position: relative;
    overflow: hidden;
}

.primary-download-btn:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(66, 133, 244, 0.6);
    background: linear-gradient(45deg, #1a73e8, #0d62d9);
}

.primary-download-btn i {
    font-size: 28px;
    margin-bottom: 10px;
}

.primary-download-btn span {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 5px;
}

.download-hint {
    font-size: 12px;
    opacity: 0.9;
    font-weight: 400;
}

/* 动态效果区域 */
.dynamic-section {
    background: var(--bg-secondary);
    border-radius: 20px;
    padding: 40px;
}

.dynamic-section h2 {
    text-align: center;
    font-size: 32px;
    margin-bottom: 40px;
    color: var(--text-primary);
}

.performance-demo {
    display: flex;
    flex-direction: column;
    gap: 25px;
    margin-bottom: 40px;
}

.performance-item {
    display: flex;
    align-items: center;
    background: var(--bg-primary);
    border-radius: 12px;
    padding: 25px;
    border: 1px solid var(--border-color);
}

.performance-icon {
    width: 70px;
    height: 70px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    color: white;
    margin-right: 25px;
    flex-shrink: 0;
}

.performance-icon.speed {
    background: linear-gradient(45deg, #4285f4, #1a73e8);
}

.performance-icon.memory {
    background: linear-gradient(45deg, #34a853, #2e8b57);
}

.performance-icon.security {
    background: linear-gradient(45deg, #ea4335, #d23c2e);
}

.performance-content {
    flex: 1;
}

.performance-content h4 {
    font-size: 18px;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.performance-bar {
    height: 20px;
    background: var(--bg-secondary);
    border-radius: 10px;
    overflow: hidden;
    position: relative;
}

.bar-fill {
    height: 100%;
    border-radius: 10px;
    position: relative;
    transition: width 1.5s ease;
}

.bar-fill span {
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    color: white;
    font-size: 12px;
    font-weight: 600;
}

.performance-icon.speed + .performance-content .bar-fill {
    background: linear-gradient(90deg, #4285f4, #1a73e8);
}

.performance-icon.memory + .performance-content .bar-fill {
    background: linear-gradient(90deg, #34a853, #2e8b57);
}

.performance-icon.security + .performance-content .bar-fill {
    background: linear-gradient(90deg, #ea4335, #d23c2e);
}

.demo-action {
    text-align: center;
}

.demo-action p {
    color: var(--text-secondary);
    margin-bottom: 20px;
    font-size: 18px;
}

.demo-download-btn {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    background: linear-gradient(45deg, #4285f4, #34a853);
    color: white;
    padding: 18px 40px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 600;
    font-size: 18px;
    transition: var(--transition);
    box-shadow: 0 10px 25px rgba(66, 133, 244, 0.4);
}

.demo-download-btn:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(66, 133, 244, 0.6);
}

/* 页脚 */
.footer {
    background: var(--bg-secondary);
    padding: 60px 0 30px;
    border-top: 1px solid var(--border-color);
    margin-top: 60px;
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

.footer-download {
    text-align: center;
    margin-bottom: 50px;
    padding-bottom: 50px;
    border-bottom: 1px solid var(--border-color);
}

.footer-download h3 {
    font-size: 32px;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.footer-download p {
    color: var(--text-secondary);
    margin-bottom: 30px;
    font-size: 18px;
}

.footer-download-btn {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    background: linear-gradient(45deg, #4285f4, #1a73e8);
    color: white;
    padding: 20px 45px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 700;
    font-size: 20px;
    transition: var(--transition);
    box-shadow: 0 15px 35px rgba(66, 133, 244, 0.4);
}

.footer-download-btn:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(66, 133, 244, 0.6);
    background: linear-gradient(45deg, #1a73e8, #0d62d9);
}

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

.link-group h4 {
    margin-bottom: 20px;
    color: var(--text-primary);
}

.link-group a {
    display: block;
    color: var(--text-secondary);
    text-decoration: none;
    margin-bottom: 12px;
    transition: var(--transition);
}

.link-group a:hover {
    color: var(--primary-color);
}

.footer-legal {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 14px;
}

.legal-links {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-top: 15px;
}

.legal-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
}

.legal-links a:hover {
    color: var(--primary-color);
}

/* 固定底部下载条 */
.fixed-download-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    background: var(--bg-primary);
    border-top: 1px solid var(--border-color);
    padding: 15px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 1000;
    box-shadow: 0 -5px 20px rgba(0,0,0,0.1);
}

.fixed-info {
    display: flex;
    align-items: center;
    gap: 15px;
}

.fixed-info i {
    font-size: 24px;
    color: var(--primary-color);
}

.fixed-title {
    font-weight: 700;
    color: var(--text-primary);
}

.fixed-subtitle {
    font-size: 12px;
    color: var(--text-secondary);
}

.fixed-download-btn {
    background: linear-gradient(45deg, #4285f4, #1a73e8);
    color: white;
    padding: 12px 30px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 10px;
}

.fixed-download-btn:hover {
    background: linear-gradient(45deg, #1a73e8, #0d62d9);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(66, 133, 244, 0.4);
}

/* 响应式设计 */
@media (max-width: 1200px) {
    .hero-container {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .hero-visual {
        order: -1;
    }
    
    .main-content {
        flex-direction: column;
    }
    
    .sidebar {
        width: 100%;
        position: static;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .hero-title {
        font-size: 36px;
    }
    
    .download-main {
        font-size: 22px;
    }
    
    .platform-badges {
        justify-content: center;
    }
    
    .download-footer {
        flex-direction: column;
        gap: 25px;
        text-align: center;
    }
    
    .platform-card {
        flex-direction: column;
        text-align: center;
        padding: 20px;
    }
    
    .platform-icon {
        margin-right: 0;
        margin-bottom: 15px;
    }
    
    .platform-action {
        margin-left: 0;
        margin-top: 15px;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .fixed-download-bar {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }
    
    .hero-download-btn {
        flex-direction: column;
        text-align: center;
        padding: 20px;
    }
    
    .download-icon {
        margin-right: 0;
        margin-bottom: 15px;
    }
    
    .download-arrow {
        display: none;
    }
}