* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Google Sans', 'Roboto', system-ui, -apple-system, 'Segoe UI', sans-serif;
    background-color: #ffffff;
    color: #202124;
    line-height: 1.5;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}

/* 头部导航 */
.header {
    padding: 10px 0;
    border-bottom: 1px solid #e8eaed;
    background: #fff;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(8px);
    background-color: rgba(255, 255, 255, 0.96);
}

.nav-wrapper {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 16px;
}

.logo-area {
    display: flex;
    align-items: center;
    gap: 8px;
}

.chrome-logo svg {
    width: 32px;
    height: 32px;
    display: block;
}

.brand-name {
    font-size: 1.5rem;
    font-weight: 500;
    letter-spacing: -0.5px;
    background: linear-gradient(135deg, #1A73E8, #34A853);
    background-clip: text;
    -webkit-background-clip: text;
    color: #5f6368;
}

.nav-links {
    display: flex;
    gap: 28px;
    align-items: center;
}

.nav-links a {
    text-decoration: none;
    color: #1f1f1f;
    font-weight: 500;
    font-size: 1rem;
    transition: color 0.2s;
}

.nav-links a:hover {
    color: #1A73E8;
}

.btn-download {
    background-color: #1A73E8;
    color: white !important;
    padding: 8px 20px;
    border-radius: 40px;
    transition: background 0.2s;
}

.btn-download:hover {
    background-color: #1557b0;
}

/* Hero 主视觉区 - 增加图片背景元素 */
.hero {
    text-align: center;
    padding: 64px 0 48px;
    background: linear-gradient(135deg, #f9fafc 0%, #f1f5f9 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: "";
    position: absolute;
    top: -20%;
    right: -10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(26,115,232,0.08) 0%, rgba(52,168,83,0.05) 100%);
    border-radius: 50%;
    pointer-events: none;
}

.hero::after {
    content: "";
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(251,188,4,0.08) 0%, rgba(234,67,53,0.04) 100%);
    border-radius: 50%;
    pointer-events: none;
}

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

.hero h1 {
    font-size: 3.2rem;
    font-weight: 700;
    background-clip: text;
    -webkit-background-clip: text;
    margin-bottom: 20px;
}

.hero .tagline {
    font-size: 1.1rem;
    color: #5f6368;
    max-width: 700px;
    margin: 0 auto 32px;
}

.hero .tagline-add {
    font-size: 0.8rem;
    color: #8c8c8d;
    max-width: 700px;
    margin: 0 auto 10px;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 15px;
}

.btn-primary {
    background: #1A73E8;
    color: white;
    border: none;
    padding: 12px 32px;
    font-size: 1.1rem;
    font-weight: 500;
    border-radius: 40px;
    cursor: pointer;
    transition: 0.2s;
    text-decoration: none;
    display: inline-block;
}

.btn-primary:hover {
    background: #1669c2;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    transform: translateY(-2px);
}

.btn-outline {
    background: transparent;
    border: 1px solid #dadce0;
    padding: 12px 32px;
    font-size: 1.1rem;
    border-radius: 40px;
    color: #1A73E8;
    font-weight: 500;
    text-decoration: none;
    transition: 0.2s;
}

.btn-outline:hover {
    background: #f1f3f4;
    border-color: #1A73E8;
}

.hero-image {
    max-width: 1024px;
    margin: 0 auto;
    text-align: center;
}

.hero-image img {
    max-width: 100%;
    height: auto;
    filter: drop-shadow(0 20px 25px -12px rgba(0,0,0,0.15));
    transition: transform 0.3s ease;
}

.hero-image img:hover {
    transform: scale(1.02);
}

/* 卡片通用样式 */
.section-title {
    font-size: 2rem;
    font-weight: 600;
    text-align: center;
    margin: 64px 0 40px;
    letter-spacing: -0.3px;
    color: #202124;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 32px;
    margin-bottom: 80px;
    margin-top: 80px;
}

.feature-card {
    background: #fff;
    border-radius: 28px;
    padding: 28px 24px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.03);
    transition: transform 0.2s, box-shadow 0.2s;
    border: 1px solid #f0f0f0;
    text-align: center;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 20px 25px -12px rgba(0,0,0,0.1);
}

.feature-icon {
    font-size: 2.8rem;
    margin-bottom: 20px;
    display: inline-block;
}

.feature-img-icon {
    width: 60px;
    height: 60px;
    margin-bottom: 20px;
    object-fit: contain;
}

.feature-card h3 {
    font-size: 1.4rem;
    font-weight: 500;
    margin-bottom: 12px;
}

.feature-card p {
    color: #5f6368;
    font-size: 1rem;
    line-height: 1.4;
}

/* 双列布局 安全与隐私部分 */
.two-columns {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 32px;
    margin: 40px 0;
}

.security-card {
    background: #f8f9fa;
    border-radius: 28px;
    padding: 32px;
    transition: all 0.2s;
    text-align: center;
}

.security-card:hover {
    transform: translateY(-4px);
    background: #ffffff;
    box-shadow: 0 8px 20px rgba(0,0,0,0.08);
}

.security-card h3 {
    font-size: 1.4rem;
    font-weight: 500;
    margin: 16px 0 12px;
}

.security-card p {
    color: #3c4043;
}

.security-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto;
}

/* 自定义+跨设备区域 */
.customize-row {
    display: flex;
    flex-wrap: wrap;
    gap: 48px;
    background: linear-gradient(135deg, #fef7e0 0%, #fff3e0 100%);
    border-radius: 48px;
    padding: 48px 40px;
    margin: 64px 0;
    align-items: center;
}

.customize-text {
    flex: 1.2;
}

.customize-text h2 {
    font-size: 2rem;
    font-weight: 500;
    margin-bottom: 16px;
}

.customize-text ul {
    list-style: none;
    padding-left: 0;
}

.customize-text li {
    margin: 16px 0;
    position: relative;
    align-items: center;
    gap: 12px;
    font-size: 1.1rem;
    padding-left: 30px;
}

.customize-text li::before {
    content: "✓";
    color: #34A853;
    font-weight: bold;
    font-size: 1.3rem;
    position: absolute;
/*     top: 50%; */
    left: 0px;
/*     transform: translateY(-50%); */
}

.customize-text li span {
    font-weight: bold;
}

.customize-illustration {
    flex: 0.8;
    text-align: center;
}

.customize-illustration img {
    max-width: 100%;
    height: auto;
    border-radius: 24px;
}

/* 扩展与 AI 区块 */
.ai-extension-wrap {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
    margin: 40px 0 64px;
}

.ai-card {
    background: linear-gradient(145deg, #e8f0fe);
    border-radius: 32px;
    padding: 36px 32px;
    text-align: center;
    transition: transform 0.2s;
}

.ai-card:hover {
    transform: translateY(-4px);
}

.ai-card h3 {
    font-size: 1.8rem;
    margin: 20px 0 16px;
    color: #174ea6;
}

.ai-card p {
    color: #3c4043;
}

.store-badge {
    background: #1A73E8;
    color: white;
    border-radius: 60px;
    padding: 10px 28px;
    display: inline-block;
    margin-top: 24px;
    font-weight: 500;
    text-decoration: none;
    transition: 0.2s;
}

.store-badge:hover {
    background: #1557b0;
    transform: scale(1.02);
}

.ai-icon, .ext-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto;
}

/* footer */
.footer {
    background: #f1f3f4;
    padding: 20px 0 15px;
    margin-top: 80px;
    font-size: 0.85rem;
    color: #5f6368;
    text-align: center;
}

.footer .container > p:not(:last-of-type) {
    margin-bottom: 5px;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 32px;
    flex-wrap: wrap;
    margin-bottom: 24px;
}

.footer-links a {
    text-decoration: none;
    color: #3c4043;
}

.footer-links a:hover {
    color: #1A73E8;
}

/* 响应式 */
@media (max-width: 768px) {
    .container {
        padding: 0 20px;
    }
    .hero h1 {
        font-size: 2.2rem;
    }
    .hero .tagline {
        font-size: 1.2rem;
    }
    .section-title {
        font-size: 1.8rem;
    }
    .customize-row {
        flex-direction: column;
        text-align: center;
        padding: 32px 24px;
    }
    .customize-text li {
        justify-content: center;
    }
    .nav-wrapper {
        flex-direction: column;
        align-items: center;
    }
}

@media (max-width: 480px) {
    .feature-grid, .two-columns {
        gap: 20px;
    }
    .btn-primary, .btn-outline {
        padding: 10px 20px;
        font-size: 1rem;
    }
}