/* ============================================
   全局样式重置和变量定义
   ============================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-blue: #1A73E8;
    --primary-blue-light: #4285F4;
    --primary-blue-dark: #1557B0;
    --text-primary: #202124;
    --text-secondary: #5F6368;
    --text-tertiary: #80868B;
    --bg-white: #FFFFFF;
    --bg-light: #F8F9FA;
    --bg-lighter: #F1F3F4;
    --border-color: #DADCE0;
    --success: #34A853;
    --warning: #FBBC04;
    --error: #EA4335;
    --shadow-sm: 0 1px 2px 0 rgba(60,64,67,.3), 0 1px 3px 1px rgba(60,64,67,.15);
    --shadow-md: 0 2px 6px 2px rgba(60,64,67,.15), 0 8px 12px 4px rgba(60,64,67,.15);
    --shadow-lg: 0 4px 12px 3px rgba(60,64,67,.15), 0 16px 24px 4px rgba(60,64,67,.15);
    --gradient-primary: linear-gradient(135deg, #1A73E8 0%, #4285F4 100%);
    --gradient-hero: linear-gradient(135deg, #1A73E8 0%, #4285F4 50%, #34A853 100%);
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--text-primary);
    line-height: 1.6;
    background-color: var(--bg-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

/* ============================================
   顶部导航栏
   ============================================ */
.header {
    position: sticky;
    top: 0;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    width: 100%;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

.nav-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 32px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 600;
    font-size: 18px;
    transition: transform 0.2s ease;
}

.logo:hover {
    transform: scale(1.05);
}

.logo-img {
    width: 238px;
    height: 32px;
    display: block;
    object-fit: contain;
}

.logo-text {
    font-weight: 600;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 40px;
    align-items: center;
}

.nav-item {
    position: relative;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 15px;
    font-weight: 500;
    transition: color 0.2s ease;
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 0;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-blue);
    transition: width 0.3s ease;
}

.nav-link:hover {
    color: var(--primary-blue);
}

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

.dropdown-arrow {
    transition: transform 0.2s ease;
}

.dropdown:hover .dropdown-arrow {
    transform: rotate(180deg);
}

/* 下拉菜单 */
.dropdown-menu {
    position: absolute;
    top: calc(100% + 12px);
    left: 0;
    background-color: var(--bg-white);
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    list-style: none;
    min-width: 200px;
    padding: 8px;
    margin: 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

.dropdown-menu li {
    margin: 0;
}

.dropdown-menu a {
    display: block;
    padding: 12px 16px;
    color: var(--text-primary);
    text-decoration: none;
    font-size: 14px;
    border-radius: 8px;
    transition: all 0.2s ease;
}

.dropdown-menu a:hover {
    background-color: var(--bg-light);
    color: var(--primary-blue);
    transform: translateX(4px);
}

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    z-index: 1001;
}

.menu-toggle span {
    width: 24px;
    height: 3px;
    background-color: var(--text-primary);
    border-radius: 2px;
    transition: all 0.3s ease;
}

.menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(8px, 8px);
}

.menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

/* ============================================
   主视觉区域
   ============================================ */
.hero {
    position: relative;
    padding: 120px 32px;
    min-height: calc(100vh - 72px);
    display: flex;
    align-items: center;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 0;
}

.hero-gradient {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-hero);
}

.hero-pattern {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        radial-gradient(circle at 20% 30%, rgba(255,255,255,0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(255,255,255,0.1) 0%, transparent 50%);
    animation: patternMove 20s ease-in-out infinite;
}

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

.hero-container {
    max-width: 1280px;
    margin: 0 auto;
    width: 100%;
    position: relative;
    z-index: 1;
}

.hero-content {
    display: flex;
    align-items: center;
    gap: 80px;
}

.hero-text {
    flex: 1;
    color: white;
}

.hero-badge {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 24px;
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.hero-title {
    font-size: 64px;
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 24px;
    letter-spacing: -1px;
}

.title-line {
    display: block;
}

.title-highlight {
    background: linear-gradient(135deg, #FFD700 0%, #FFA500 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 20px;
    font-weight: 400;
    line-height: 1.7;
    margin-bottom: 40px;
    opacity: 0.95;
    max-width: 600px;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    margin-bottom: 48px;
    flex-wrap: wrap;
}

.btn-download-primary {
    padding: 16px 32px;
    background-color: white;
    color: var(--primary-blue);
    border: none;
    border-radius: 28px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: 8px;
}

.btn-download-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0,0,0,0.2);
}

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

.btn-secondary-outline {
    padding: 16px 32px;
    background-color: transparent;
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.5);
    border-radius: 28px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-secondary-outline:hover {
    background-color: rgba(255, 255, 255, 0.1);
    border-color: white;
    transform: translateY(-2px);
}

.hero-stats {
    display: flex;
    gap: 48px;
    flex-wrap: wrap;
}

.stat-item {
    display: flex;
    flex-direction: column;
}

.stat-number {
    font-size: 36px;
    font-weight: 700;
    line-height: 1;
    margin-bottom: 8px;
}

.stat-label {
    font-size: 14px;
    opacity: 0.9;
    font-weight: 400;
}

.hero-image {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

.browser-mockup {
    width: 100%;
    max-width: 700px;
    background: white;
    border-radius: 16px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
    overflow: hidden;
    transform: perspective(1000px) rotateY(-5deg) rotateX(5deg);
    transition: transform 0.3s ease;
}

.browser-mockup:hover {
    transform: perspective(1000px) rotateY(0) rotateX(0) scale(1.02);
}

.browser-header {
    background: var(--bg-lighter);
    padding: 12px 16px;
    display: flex;
    align-items: center;
    gap: 12px;
    border-bottom: 1px solid var(--border-color);
}

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

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

.dot-red { background: #FF5F57; }
.dot-yellow { background: #FFBD2E; }
.dot-green { background: #28CA42; }

.browser-url-bar {
    flex: 1;
    background: white;
    padding: 10px 16px;
    border-radius: 8px;
    font-size: 14px;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 8px;
    border: 1px solid var(--border-color);
}

.url-icon {
    color: var(--success);
}

.browser-actions {
    color: var(--text-secondary);
    cursor: pointer;
}

.browser-content {
    padding: 0;
}

.browser-tabs {
    display: flex;
    gap: 2px;
    padding: 8px 8px 0;
    background: var(--bg-lighter);
    border-bottom: 1px solid var(--border-color);
}

.tab {
    padding: 10px 16px;
    background: white;
    border-radius: 8px 8px 0 0;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    border-bottom: none;
}

.tab.active {
    background: white;
    color: var(--text-primary);
    font-weight: 500;
}

.tab-icon {
    width: 16px;
    height: 16px;
    border-radius: 2px;
    background: var(--primary-blue);
}

.tab-close {
    margin-left: auto;
    opacity: 0.5;
    cursor: pointer;
}

.browser-main {
    padding: 40px;
    min-height: 400px;
    background: white;
}

.browser-welcome {
    text-align: center;
    margin-bottom: 40px;
}

.welcome-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

.browser-welcome h3 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.browser-welcome p {
    color: var(--text-secondary);
    font-size: 16px;
}

.browser-shortcuts {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

.shortcut-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    padding: 24px;
    border-radius: 12px;
    background: var(--bg-light);
    transition: transform 0.2s ease;
    cursor: pointer;
}

.shortcut-item:hover {
    transform: translateY(-4px);
    background: var(--bg-lighter);
}

.shortcut-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
}

.shortcut-item span {
    font-size: 14px;
    color: var(--text-primary);
    font-weight: 500;
}

/* ============================================
   功能展示区
   ============================================ */
.features {
    padding: 120px 32px;
    background-color: var(--bg-white);
}

.features-container {
    max-width: 1280px;
    margin: 0 auto;
}

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-badge {
    display: inline-block;
    padding: 6px 16px;
    background: var(--bg-light);
    color: var(--primary-blue);
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 16px;
}

.section-title {
    font-size: 48px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 16px;
    color: var(--text-primary);
    letter-spacing: -1px;
    line-height: 1.2;
}

.section-description {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.7;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
}

.feature-card {
    background-color: var(--bg-white);
    padding: 40px;
    border-radius: 16px;
    text-align: left;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.feature-card:hover::before {
    transform: scaleX(1);
}

.feature-icon-wrapper {
    margin-bottom: 24px;
}

.feature-icon {
    width: 64px;
    height: 64px;
    border-radius: 16px;
    background: var(--bg-light);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-blue);
    transition: all 0.3s ease;
}

.feature-card:hover .feature-icon {
    background: var(--gradient-primary);
    color: white;
    transform: scale(1.1) rotate(5deg);
}

.feature-title {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.feature-description {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 16px;
}

.feature-link {
    color: var(--primary-blue);
    text-decoration: none;
    font-size: 14px;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    transition: gap 0.2s ease;
}

.feature-link:hover {
    gap: 8px;
}

/* ============================================
   性能展示区
   ============================================ */
.performance {
    padding: 120px 32px;
    background: linear-gradient(135deg, #F8F9FA 0%, #E8F0FE 100%);
}

.performance-container {
    max-width: 1280px;
    margin: 0 auto;
}

.performance-content {
    display: flex;
    align-items: center;
    gap: 80px;
}

.performance-text {
    flex: 1;
}

.performance-metrics {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    margin-top: 40px;
}

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

.metric-value {
    font-size: 48px;
    font-weight: 700;
    color: var(--primary-blue);
    line-height: 1;
    margin-bottom: 8px;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.metric-label {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 500;
}

.performance-visual {
    flex: 1;
    display: flex;
    justify-content: center;
}

.performance-chart {
    display: flex;
    align-items: flex-end;
    gap: 24px;
    height: 300px;
}

.chart-bar {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    animation: barGrow 1s ease-out forwards;
    opacity: 0;
}

@keyframes barGrow {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.bar-fill {
    width: 100%;
    background: var(--gradient-primary);
    border-radius: 8px 8px 0 0;
    min-height: 60px;
    animation: fillUp 1s ease-out forwards;
    transform-origin: bottom;
}

@keyframes fillUp {
    from {
        transform: scaleY(0);
    }
    to {
        transform: scaleY(1);
    }
}

.bar-label {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 500;
}

/* ============================================
   特色区域
   ============================================ */
.highlight {
    padding: 120px 32px;
    background: linear-gradient(135deg, #E8F0FE 0%, #D2E3FC 100%);
    position: relative;
    overflow: hidden;
}

.highlight::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(26, 115, 232, 0.1) 0%, transparent 70%);
    border-radius: 50%;
}

.highlight-container {
    max-width: 1280px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.highlight-content {
    display: flex;
    align-items: center;
    gap: 80px;
}

.highlight-text {
    flex: 1;
}

.highlight-title {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 24px;
    color: var(--text-primary);
    letter-spacing: -1px;
    line-height: 1.2;
}

.highlight-description {
    font-size: 18px;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: 32px;
}

.highlight-features {
    list-style: none;
    margin-bottom: 40px;
}

.highlight-features li {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
    font-size: 16px;
    color: var(--text-primary);
}

.highlight-features li svg {
    color: var(--success);
    flex-shrink: 0;
}

.btn-learn-more {
    padding: 16px 32px;
    background-color: var(--primary-blue);
    color: white;
    border: none;
    border-radius: 28px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-md);
}

.btn-learn-more:hover {
    background-color: var(--primary-blue-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.highlight-image {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

.highlight-graphic {
    position: relative;
    width: 500px;
    height: 500px;
}

.graphic-circle {
    position: absolute;
    border-radius: 50%;
    animation: float 6s ease-in-out infinite;
}

.graphic-circle-1 {
    width: 250px;
    height: 250px;
    background: rgba(26, 115, 232, 0.15);
    top: 0;
    left: 0;
}

.graphic-circle-2 {
    width: 200px;
    height: 200px;
    background: rgba(66, 133, 244, 0.2);
    top: 150px;
    right: 0;
    animation-delay: 2s;
}

.graphic-circle-3 {
    width: 150px;
    height: 150px;
    background: rgba(26, 115, 232, 0.25);
    bottom: 50px;
    left: 100px;
    animation-delay: 4s;
}

.graphic-center {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 2;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px) scale(1);
    }
    50% {
        transform: translateY(-30px) scale(1.05);
    }
}

/* ============================================
   下载区域
   ============================================ */
.download-section {
    padding: 120px 32px;
    background: var(--gradient-primary);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.download-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 30% 50%, rgba(255,255,255,0.1) 0%, transparent 50%),
        radial-gradient(circle at 70% 50%, rgba(255,255,255,0.1) 0%, transparent 50%);
}

.download-container {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.download-content {
    color: white;
}

.download-title {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 16px;
    letter-spacing: -1px;
}

.download-description {
    font-size: 20px;
    margin-bottom: 40px;
    opacity: 0.95;
}

.btn-download-large {
    padding: 20px 48px;
    background-color: white;
    color: var(--primary-blue);
    border: none;
    border-radius: 32px;
    font-size: 18px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 8px 24px rgba(0,0,0,0.2);
    display: inline-flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 24px;
}

.btn-download-large:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 32px rgba(0,0,0,0.3);
}

.download-note {
    font-size: 14px;
    opacity: 0.9;
}

/* ============================================
   底部区域
   ============================================ */
.footer {
    background-color: var(--bg-light);
    padding: 80px 32px 32px;
    border-top: 1px solid var(--border-color);
}

.footer-container {
    max-width: 1280px;
    margin: 0 auto;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 48px;
    margin-bottom: 48px;
}

.footer-section {
    display: flex;
    flex-direction: column;
}

.footer-title {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 12px;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.2s ease;
    display: inline-block;
}

.footer-links a:hover {
    color: var(--primary-blue);
    transform: translateX(4px);
}

.language-select {
    padding: 10px 16px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background-color: var(--bg-white);
    color: var(--text-primary);
    font-size: 14px;
    cursor: pointer;
    width: 100%;
    max-width: 200px;
    transition: all 0.2s ease;
}

.language-select:hover {
    border-color: var(--primary-blue);
}

.footer-social {
    display: flex;
    gap: 12px;
    margin-top: 20px;
}

.social-link {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--bg-white);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: all 0.2s ease;
    border: 1px solid var(--border-color);
}

.social-link:hover {
    background: var(--primary-blue);
    color: white;
    border-color: var(--primary-blue);
    transform: translateY(-2px);
}

.footer-bottom {
    padding-top: 32px;
    border-top: 1px solid var(--border-color);
    text-align: center;
}

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

/* ============================================
   下载弹窗
   ============================================ */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    z-index: 2000;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal.active {
    display: flex;
}

.modal-content {
    background-color: var(--bg-white);
    border-radius: 20px;
    padding: 40px;
    max-width: 800px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
    box-shadow: var(--shadow-lg);
    animation: slideUp 0.3s ease;
}

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

.modal-close {
    position: absolute;
    top: 20px;
    right: 20px;
    background: var(--bg-light);
    border: none;
    font-size: 28px;
    color: var(--text-secondary);
    cursor: pointer;
    line-height: 1;
    padding: 0;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: all 0.2s ease;
}

.modal-close:hover {
    background: var(--error);
    color: white;
    transform: rotate(90deg);
}

.modal-title {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.modal-description {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 32px;
}

.modal-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 24px;
}

.modal-option {
    padding: 32px 24px;
    border: 2px solid var(--border-color);
    border-radius: 16px;
    text-align: center;
    transition: all 0.3s ease;
}

.modal-option:hover {
    border-color: var(--primary-blue);
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.modal-option-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

.modal-option h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.modal-option p {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.btn-modal-download {
    padding: 12px 24px;
    background-color: var(--primary-blue);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    width: 100%;
}

.btn-modal-download:hover {
    background-color: var(--primary-blue-dark);
    transform: translateY(-2px);
}

/* ============================================
   滚动动画
   ============================================ */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ============================================
   响应式设计
   ============================================ */
@media (max-width: 1024px) {
    .hero-content,
    .performance-content,
    .highlight-content {
        flex-direction: column;
        gap: 48px;
    }

    .hero-title {
        font-size: 48px;
    }

    .section-title,
    .highlight-title {
        font-size: 36px;
    }

    .performance-metrics {
        grid-template-columns: repeat(3, 1fr);
        gap: 24px;
    }
}

@media (max-width: 768px) {
    .nav-container {
        padding: 0 24px;
    }

    .nav-menu {
        position: fixed;
        top: 72px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 72px);
        background-color: var(--bg-white);
        flex-direction: column;
        padding: 32px 24px;
        gap: 24px;
        transition: left 0.3s ease;
        box-shadow: var(--shadow-lg);
        overflow-y: auto;
    }

    .nav-menu.active {
        left: 0;
    }

    .menu-toggle {
        display: flex;
    }

    .hero {
        padding: 80px 24px;
    }

    .hero-title {
        font-size: 36px;
    }

    .hero-subtitle {
        font-size: 18px;
    }

    .hero-stats {
        gap: 32px;
    }

    .stat-number {
        font-size: 28px;
    }

    .features,
    .performance,
    .highlight,
    .download-section {
        padding: 80px 24px;
    }

    .section-title,
    .highlight-title,
    .download-title {
        font-size: 32px;
    }

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

    .performance-metrics {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .metric-value {
        font-size: 36px;
    }

    .highlight-graphic {
        width: 300px;
        height: 300px;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .modal-options {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 28px;
    }

    .hero-buttons {
        flex-direction: column;
        width: 100%;
    }

    .btn-download-primary,
    .btn-secondary-outline {
        width: 100%;
        justify-content: center;
    }

    .section-title,
    .highlight-title,
    .download-title {
        font-size: 24px;
    }

    .browser-mockup {
        transform: none;
    }

    .browser-shortcuts {
        grid-template-columns: 1fr;
    }
}