/* 全局变量与蓝白主题色彩定义 */
:root {
    --primary-blue: #0052CC;      /* 企业蓝 */
    --hover-blue: #0047B3;       
    --light-blue: #E6F0FF;       /* 浅蓝背景 */
    --accent-blue: #00A3FF;      /* 亮蓝点缀 */
    
    --bg-white: #FFFFFF;
    --bg-gray: #F8FAFC;          /* 极浅灰背景，用于区隔区块 */
    
    --text-main: #111827;        /* 深灰黑正文 */
    --text-body: #4B5563;        /* 灰色正文 */
    --text-muted: #9CA3AF;       /* 弱化辅助文字 */
    
    --border-color: #E5E7EB;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 50, 150, 0.1), 0 4px 6px -2px rgba(0, 50, 150, 0.05);
    
    --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Microsoft YaHei', sans-serif;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    color: var(--text-body);
    background-color: var(--bg-white);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.text-blue {
    color: var(--primary-blue);
}

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

/* --- 按钮组件通用样式 --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-weight: 500;
    border-radius: 6px;
    transition: all 0.2s ease-in-out;
    text-decoration: none;
    cursor: pointer;
}

.btn-primary {
    background-color: var(--primary-blue);
    color: #FFFFFF;
    border: 1px solid var(--primary-blue);
}

.btn-primary:hover {
    background-color: var(--hover-blue);
    border-color: var(--hover-blue);
    box-shadow: 0 4px 12px rgba(0, 82, 204, 0.3);
    transform: translateY(-1px);
}

.btn-outline {
    background-color: transparent;
    color: var(--primary-blue);
    border: 1px solid var(--primary-blue);
}

.btn-outline:hover {
    background-color: var(--light-blue);
}

.btn-sm {
    padding: 8px 16px;
    font-size: 0.875rem;
}

.btn-lg {
    padding: 14px 28px;
    font-size: 1.05rem;
}

/* --- 企业级头部导航 --- */
.header {
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border-color);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    transition: box-shadow 0.3s ease;
}

.header.scrolled {
    box-shadow: var(--shadow-sm);
}

.nav-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 72px;
}

.brand-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
}

.brand-text {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-main);
    display: flex;
    align-items: center;
    gap: 8px;
}

.badge {
    background-color: var(--light-blue);
    color: var(--primary-blue);
    font-size: 0.75rem;
    padding: 2px 6px;
    border-radius: 4px;
    font-weight: 600;
}

.main-nav {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-link {
    color: var(--text-body);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    transition: color 0.2s;
}

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

/* --- Hero 首屏主视觉区 --- */
.hero {
    padding: 160px 0 100px;
    overflow: hidden;
}

.bg-light-blue {
    background: linear-gradient(135deg, #F0F5FF 0%, #FFFFFF 100%);
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    color: var(--text-main);
    line-height: 1.2;
    margin-bottom: 24px;
    letter-spacing: -0.5px;
}

.hero-subtitle {
    font-size: 1.125rem;
    color: var(--text-body);
    margin-bottom: 40px;
    max-width: 540px;
    line-height: 1.7;
}

.hero-cta {
    display: flex;
    gap: 16px;
    margin-bottom: 24px;
}

.hero-meta {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.hero-illustration {
    position: relative;
    width: 100%;
    animation: floatUpDown 6s ease-in-out infinite;
}

@keyframes floatUpDown {
    0% { transform: translateY(0); }
    50% { transform: translateY(-15px); }
    100% { transform: translateY(0); }
}

/* --- 信任标志区 --- */
.trust-section {
    padding: 40px 0;
    border-bottom: 1px solid var(--border-color);
    background-color: #FFFFFF;
}

.trust-title {
    text-align: center;
    font-size: 0.875rem;
    color: var(--text-muted);
    font-weight: 500;
    margin-bottom: 24px;
}

.trust-logos {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 48px;
    flex-wrap: wrap;
    opacity: 0.6;
}

/* --- 核心特性展示 --- */
.features-section {
    padding: 100px 0;
    background-color: var(--bg-gray);
}

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

.section-title {
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 16px;
}

.section-desc {
    font-size: 1.125rem;
    max-width: 600px;
    margin: 0 auto;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.feature-card {
    background-color: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 40px 32px;
    transition: all 0.3s ease;
}

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

.icon-box {
    width: 56px;
    height: 56px;
    background-color: var(--light-blue);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
}

.feature-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 16px;
}

.feature-text {
    font-size: 0.95rem;
    color: var(--text-body);
    line-height: 1.6;
}

/* --- 底部企业版权区 --- */
.footer-corporate {
    background-color: #0A192F; /* 非常深的深蓝色，彰显企业稳重感 */
    color: #94A3B8;
    padding: 80px 0 24px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 64px;
}

.footer-logo {
    margin-bottom: 16px;
}

.footer-logo .brand-text {
    color: #FFFFFF;
}

.footer-slogan {
    margin-bottom: 24px;
    font-size: 0.95rem;
}

.contact-info p {
    font-size: 0.9rem;
    margin-bottom: 8px;
    color: #CBD5E1;
}

.footer-links-col h4 {
    color: #FFFFFF;
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 20px;
}

.footer-links-col a {
    display: block;
    color: #94A3B8;
    text-decoration: none;
    font-size: 0.9rem;
    margin-bottom: 12px;
    transition: color 0.2s;
}

.footer-links-col a:hover {
    color: #60A5FA;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 24px;
    text-align: center;
    font-size: 0.85rem;
}

/* --- 响应式适配 --- */
@media (max-width: 992px) {
    .hero-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-subtitle {
        margin: 0 auto 40px;
    }
    
    .hero-cta {
        justify-content: center;
    }
    
    .hero-illustration {
        max-width: 500px;
        margin: 0 auto;
    }
    
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .main-nav {
        display: none; /* 移动端可隐藏或转为汉堡菜单 */
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-cta {
        flex-direction: column;
        gap: 12px;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    
    .hide-mobile {
        display: none;
    }
}