:root {
    --primary-color: #0052cc; /* 深邃的企业蓝色，更显稳重专业 */
    --primary-hover: #0747a6;
    --primary-light: #deebff;
    --accent-color: #00b8d9; /* 清新的青色作为点缀，增加科技感 */
    --bg-white: #ffffff;
    --bg-light: #f4f5f7; /* 更加冷静的浅灰色背景 */
    --text-main: #091e42; /* 深海军蓝文字，比纯黑更有深度 */
    --text-muted: #505f79; /* 辅助文字颜色 */
    --text-on-dark: #ffffff;
    --border-color: #dfe1e6;
    --radius-lg: 16px; /* 稍微减小圆角，使其看起来更严谨 */
    --radius-md: 8px;
    --shadow-sm: 0 1px 3px rgba(9, 30, 66, 0.13);
    --shadow-md: 0 4px 8px -2px rgba(9, 30, 66, 0.25), 0 0 1px rgba(9, 30, 66, 0.31);
    --shadow-lg: 0 12px 24px -6px rgba(9, 30, 66, 0.25), 0 0 1px rgba(9, 30, 66, 0.31);
    --container-width: 1200px;
    --header-height: 64px;
}

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

@keyframes scaleIn {
    from { transform: scale(0.95); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Myriad Set Pro", "SF Pro Icons", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
    line-height: 1.5;
    color: var(--text-main);
    background-color: var(--bg-light);
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

ul {
    list-style: none;
}

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

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* 按钮 - 更加专业和有质感 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 28px;
    border-radius: var(--radius-md); /* 使用中等圆角，更显严谨 */
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    gap: 8px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, #0065ff 100%);
    color: #fff;
    box-shadow: 0 4px 14px 0 rgba(0, 82, 204, 0.3);
}

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(0, 82, 204, 0.4);
}

.btn-white {
    background-color: #fff;
    color: var(--primary-color);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

.btn-white:hover {
    background-color: var(--primary-light);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
}

.btn-large {
    padding: 14px 40px;
    font-size: 17px;
}

/* 导航栏 - 磨砂玻璃效果 */
.header {
    height: var(--header-height);
    background-color: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(8px);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-img {
    height: 28px;
}

.app-name {
    font-size: 18px;
    font-weight: 700;
    color: var(--primary-color);
    letter-spacing: -0.5px;
}

.nav ul {
    display: flex;
    gap: 32px;
}

.nav a {
    font-size: 15px;
    color: var(--text-muted);
    font-weight: 500;
}

.nav a:hover, .nav a.active {
    color: var(--primary-color);
}

/* Hero Section - 极致简约专业 */
.hero {
    padding: 100px 0 80px;
    text-align: center;
    background: linear-gradient(180deg, #f4f5f7 0%, #ffffff 100%);
}

.hero-container {
    animation: fadeIn 1s ease-out;
}

.hero-text {
    max-width: 850px;
    margin: 0 auto;
}

.hero-title {
    font-size: 64px;
    font-weight: 800;
    letter-spacing: -2px;
    line-height: 1.1;
    margin-bottom: 24px;
    color: var(--text-main);
}

.hero-subtitle {
    font-size: 22px;
    color: var(--text-muted);
    margin-bottom: 40px;
    line-height: 1.4;
    font-weight: 400;
}

.hero-cta {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 80px;
}

.hero-image-box {
    width: 100%;
    max-width: 1080px;
    margin: 0 auto;
    animation: scaleIn 1.2s ease-out;
}

.hero-img-actual {
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
}

/* 核心优势 - Bento Grid 布局 */
.section {
    padding: 120px 0;
}

.section-gray {
    background-color: #fff;
}

.section-title {
    text-align: center;
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 80px;
    letter-spacing: -1.5px;
}

.grid {
    display: grid;
    gap: 30px;
}

.grid-3 { grid-template-columns: repeat(3, 1fr); }

.card {
    background: #fff;
    padding: 40px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    transition: all 0.3s cubic-bezier(0.165, 0.84, 0.44, 1);
    position: relative;
    overflow: hidden;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.card i {
    font-size: 32px;
    color: var(--primary-color);
    margin-bottom: 24px;
    display: block;
}

.card h3 {
    font-size: 20px;
    margin-bottom: 12px;
    font-weight: 700;
    color: var(--text-main);
}

.card p {
    color: var(--text-muted);
    font-size: 15px;
    line-height: 1.6;
}

/* 功能展示 - 交错式布局 */
.feature-list {
    display: flex;
    flex-direction: column;
    gap: 100px;
}

.feature-item {
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: center;
    gap: 60px;
}

.feature-item:nth-child(even) {
    direction: rtl;
}

.feature-item:nth-child(even) .feature-content {
    direction: ltr;
}

.feature-content {
    max-width: 500px;
}

.badge {
    background: var(--primary-light);
    color: var(--primary-color);
    padding: 6px 14px;
    border-radius: 4px;
    font-size: 13px;
    font-weight: 700;
    margin-bottom: 20px;
    display: inline-block;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.feature-content h3 {
    font-size: 32px;
    font-weight: 800;
    margin-bottom: 20px;
    letter-spacing: -0.5px;
    color: var(--text-main);
}

.feature-content p {
    font-size: 17px;
    color: var(--text-muted);
    line-height: 1.6;
}

.feature-img-actual {
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: transform 0.5s ease;
}

.feature-item:hover .feature-img-actual {
    transform: scale(1.02);
}

/* 优势模块 - 五列平铺 */
.advantages-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 24px;
}

.adv-card {
    text-align: center;
    padding: 32px 20px;
    background: #fff;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.adv-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
}

.adv-card i {
    font-size: 24px;
    color: var(--primary-color);
    margin-bottom: 16px;
}

.adv-card h4 {
    font-size: 18px;
    margin-bottom: 8px;
}

/* 安装步骤 - 简洁卡片 */
.steps-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.step-card {
    background: #fff;
    padding: 48px 32px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    position: relative;
    text-align: center;
}

.step-num {
    font-size: 64px;
    font-weight: 800;
    color: var(--primary-color);
    opacity: 0.05;
    position: absolute;
    top: 20px;
    right: 32px;
}

/* 客户评价 - 现代卡片 */
.quote {
    font-size: 20px;
    font-style: italic;
    color: var(--text-main);
    margin-bottom: 24px;
    position: relative;
}

.quote::before {
    content: "“";
    font-size: 64px;
    color: var(--primary-color);
    opacity: 0.1;
    position: absolute;
    top: -20px;
    left: -20px;
}

.author {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-muted);
}

/* FAQ 布局 */
.faq-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
}

.faq-card {
    background: #fff;
    padding: 32px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.faq-card h4 {
    font-size: 18px;
    margin-bottom: 12px;
    color: var(--primary-color);
}

/* Footer - 极简深色 */
.footer {
    background-color: #091e42; /* 使用深海军蓝作为页脚背景，与文字色呼应 */
    color: #fff;
    padding: 80px 0 40px;
}

.footer-top {
    display: grid;
    grid-template-columns: 2fr repeat(3, 1fr);
    gap: 60px;
    margin-bottom: 60px;
}

.footer-brand h3 {
    font-size: 22px;
    margin-bottom: 20px;
    font-weight: 700;
}

.footer-brand p {
    color: #a5adba;
    line-height: 1.6;
    font-size: 14px;
}

.footer-links-col h4 {
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: 24px;
    color: #fff;
    font-weight: 700;
}

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

.footer-links-col a {
    color: #a5adba;
    font-size: 14px;
    transition: color 0.2s ease;
}

.footer-links-col a:hover {
    color: var(--accent-color);
}

.footer-bottom {
    padding-top: 32px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    justify-content: space-between;
    font-size: 13px;
    color: #a5adba;
}

.footer-legal {
    display: flex;
    gap: 32px;
}

/* Responsive */
@media (max-width: 1024px) {
    .hero-title { font-size: 56px; }
    .footer-top { grid-template-columns: 1fr 1fr; gap: 40px; }
}

/* Mobile Menu Button */
.mobile-menu-btn {
    display: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--text-main);
}

@media (max-width: 768px) {
    .mobile-menu-btn {
        display: block;
    }
    .nav {
        position: fixed;
        top: var(--header-height);
        left: 0;
        width: 100%;
        background: #fff;
        padding: 20px;
        box-shadow: var(--shadow-md);
        display: none;
        flex-direction: column;
        gap: 20px;
        z-index: 999;
    }
    .nav.active {
        display: flex;
    }
    .nav ul {
        flex-direction: column;
        gap: 20px;
    }
    .header-btns {
        display: none;
    }
    .hero-title { font-size: 42px; letter-spacing: -1.5px; }
    .hero-subtitle { font-size: 20px; }
    .grid-3, .steps-grid, .faq-grid { grid-template-columns: 1fr; }
    .feature-item { grid-template-columns: 1fr; gap: 40px; text-align: center; }
    .feature-item:nth-child(even) { direction: ltr; }
    .feature-content { max-width: 100%; }
    .advantages-grid { grid-template-columns: 1fr 1fr; }
    .footer-top { grid-template-columns: 1fr; }
    .footer-bottom { flex-direction: column; gap: 20px; text-align: center; }
}