/* --- 国际化大厂色彩管理与全局定义 --- */
:root {
    --primary: #071426;       /* 深邃科技蓝 */
    --accent: #00d2c4;        /* 活力青络色 */
    --text-main: #2c3e50;     /* 主文本色 */
    --text-muted: #64748b;    /* 次级文本色 */
    --bg-light: #f8fafc;      /* 浅灰色块背景 */
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { font-family: -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif; color: var(--text-main); line-height: 1.65; background-color: #fff; }

.main-container { max-width: 1200px; margin: 0 auto; width: 100%; }
.section-badge { font-size: 12px; font-weight: 700; color: var(--accent); letter-spacing: 2px; display: inline-block; margin-bottom: 12px; }
.section-badge.center { display: block; text-align: center; }

.sec-title { text-align: center; font-size: 32px; color: var(--primary); font-weight: 700; margin-bottom: 12px; }
.sec-subtitle { text-align: center; font-size: 16px; color: var(--text-muted); margin-bottom: 60px; }

/* --- 1. 导航栏样式 --- */
.navbar { display: flex; background: rgba(255, 255, 255, 0.96); backdrop-filter: blur(10px); padding: 18px 5%; position: fixed; width: 100%; top: 0; z-index: 1000; box-shadow: 0 2px 20px rgba(0,0,0,0.02); transition: all 0.3s; }
.navbar.scrolled { padding: 12px 5%; box-shadow: 0 4px 25px rgba(0,0,0,0.06); }
.nav-container { display: flex; width: 100%; max-width: 1200px; margin: 0 auto; justify-content: space-between; align-items: center; }
.logo { font-size: 24px; font-weight: 700; color: var(--primary); text-decoration: none; }
.logo span { color: var(--accent); }
.nav-links { display: flex; list-style: none; }
.nav-links li { margin-left: 30px; }
.nav-links a { text-decoration: none; color: var(--text-main); font-weight: 500; font-size: 15px; transition: color 0.3s; }
.nav-links a:hover { color: var(--accent); }
.nav-btn { background: var(--primary); color: #fff; padding: 10px 22px; border-radius: 4px; font-size: 14px; font-weight: 600; text-decoration: none; border-bottom: 2px solid var(--accent); }

/* --- 2. Hero 宽屏首屏 --- */
.hero { background: linear-gradient(135deg, #071426 0%, #0d2b45 100%); color: #fff; padding: 18px 5% 130px 5%; min-height: 85vh; display: flex; align-items: center; text-align: center; }
.hero-container { max-width: 880px; margin: 0 auto; padding-top: 80px; }
.hero-tag { font-size: 14px; color: var(--accent); font-weight: 600; letter-spacing: 3px; display: block; margin-bottom: 20px; }
.hero h1 { font-size: 48px; font-weight: 700; margin-bottom: 25px; letter-spacing: 2px; }
.hero p { font-size: 18px; color: #b0c4de; margin-bottom: 45px; line-height: 1.8; }
.hero-btns .btn-main { background: var(--accent); color: var(--primary); padding: 14px 36px; border-radius: 4px; font-weight: 700; margin-right: 15px; display: inline-block; text-decoration: none; }
.hero-btns .btn-sec { border: 1px solid rgba(255,255,255,0.3); color: #fff; padding: 14px 36px; border-radius: 4px; display: inline-block; text-decoration: none; }
.hero-btns .btn-sec:hover { background: rgba(255,255,255,0.05); border-color: #fff; }

/* --- 3. 关于我们模块（完全对齐修正） --- */
.about-section { padding: 110px 5%; background: #fff; overflow: hidden; }
.about-container { max-width: 1200px; margin: 0 auto; display: flex; align-items: center; justify-content: space-between; gap: 60px; }
.about-content { flex: 1.2; }
.about-content h2 { font-size: 34px; color: var(--primary); margin-bottom: 20px; font-weight: 700; }
.about-lead { font-size: 16.5px; font-weight: 600; color: var(--primary); margin-bottom: 18px; text-align: justify; }
.about-content p { font-size: 14.5px; color: var(--text-muted); margin-bottom: 15px; text-align: justify; }
.about-positioning { margin-top: 25px; padding: 20px; background: var(--bg-light); border-left: 4px solid var(--accent); border-radius: 0 4px 4px 0; }
.about-positioning h4 { color: var(--primary); margin-bottom: 8px; font-size: 16px; }
.about-visual { flex: 0.8; display: flex; align-items: center; justify-content: center; }
.about-visual svg { width: 100%; max-width: 320px; height: auto; animation: spin 60s linear infinite; }

/* --- 4. 六大核心业务矩阵 --- */
.services-section { padding: 110px 5%; background: var(--bg-light); }
.services-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 30px; }
.service-card { background: #fff; padding: 40px 30px; border-radius: 6px; box-shadow: 0 10px 30px rgba(0,0,0,0.01); border-top: 4px solid #e2e8f0; transition: all 0.3s; }
.service-card:hover { border-top-color: var(--accent); transform: translateY(-5px); box-shadow: 0 15px 35px rgba(0,0,0,0.05); }
.s-icon { font-size: 36px; margin-bottom: 20px; display: block; }
.service-card h3 { font-size: 19px; color: var(--primary); margin-bottom: 15px; font-weight: 700; }
.service-card p { font-size: 14px; color: var(--text-muted); text-align: justify; line-height: 1.7; }

/* --- 5. 面向AI时代网络能力区块 --- */
.ai-section { padding: 100px 5%; background: var(--primary); color: #fff; }
.ai-box { display: flex; flex-direction: column; gap: 40px; }
.ai-header h2 { font-size: 32px; font-weight: 700; margin-bottom: 15px; color: #fff; }
.ai-header p { color: #94a3b8; font-size: 16px; }
.ai-capabilities { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 20px; }
.ai-item { background: rgba(255,255,255,0.03); border: 1px solid rgba(255,255,255,0.06); padding: 25px 20px; border-radius: 6px; font-size: 14.5px; line-height: 1.7; }
.ai-item strong { color: var(--accent); display: block; margin-bottom: 5px; font-size: 16px; }

/* --- 6. 服务优势区块 --- */
.advantages-section { padding: 110px 5%; background: #fff; }
.adv-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 30px; }
.adv-card { border-bottom: 2px solid #e2e8f0; padding-bottom: 30px; }
.adv-card h4 { font-size: 18px; color: var(--primary); margin-bottom: 12px; font-weight: 700; }
.adv-card p { font-size: 14px; color: var(--text-muted); text-align: justify; }

/* --- 7. 服务客户类型区块 --- */
.clients-section { padding: 80px 5%; background: var(--bg-light); text-align: center; }
.client-tags { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; max-width: 1000px; margin: 0 auto; }
.client-tags span { background: #fff; color: var(--text-main); padding: 10px 22px; font-size: 14px; border-radius: 20px; font-weight: 500; box-shadow: 0 2px 10px rgba(0,0,0,0.02); }

/* --- 8. 方案定制联系与企业使命区块 --- */
.contact-section { padding: 100px 5%; background: #fff; border-top: 1px solid #e2e8f0; }
.contact-wrapper { max-width: 1200px; margin: 0 auto; display: flex; gap: 60px; align-items: center; }
.contact-info { flex: 1; }
.contact-info h3 { font-size: 28px; color: var(--primary); margin-bottom: 20px; }
.mission { font-size: 15px; margin-bottom: 15px; color: var(--text-muted); }
.mission strong { color: var(--primary); }
.contact-form-box { flex: 1; background: var(--bg-light); padding: 40px; border-radius: 8px; }
.contact-form-box h4 { font-size: 22px; color: var(--primary); margin-bottom: 10px; }
.contact-form-box p { font-size: 14px; color: var(--text-muted); margin-bottom: 25px; }
#netForm { display: flex; flex-direction: column; gap: 15px; }
#netForm input { padding: 14px 20px; border: 1px solid #cbd5e1; border-radius: 4px; font-size: 15px; outline: none; }
#netForm input:focus { border-color: var(--accent); }
#netForm button { background: var(--accent); color: var(--primary); border: none; padding: 15px; font-size: 16px; font-weight: 700; border-radius: 4px; cursor: pointer; transition: background 0.3s; }
#netForm button:hover { background: #02bdae; }

/* --- 9. 页脚 --- */
.footer { background: #07111e; color: #556575; text-align: center; padding: 35px 20px; font-size: 13.5px; border-top: 1px solid #142235; }

@keyframes spin { 100% { transform: rotate(360deg); } }

/* 响应式断点控制 */
@media (max-width: 992px) {
    .about-container, .contact-wrapper { flex-direction: column; gap: 40px; }
    .hero h1 { font-size: 34px; }
    .about-visual svg { max-width: 240px; }
}