/* ============================================================
   上海玄链科技 XuanLink Technology — 官网全局样式
   轻量、无框架、响应式
   ============================================================ */

:root {
  --primary: #f6821f;        /* 主色：Cloudflare 橙 */
  --primary-dark: #d9660a;   /* 主色深 */
  --accent: #fbad41;         /* 高亮橙黄 */
  --navy: #1d1d1f;           /* 深色（页脚/深色区块） */
  --navy-2: #2a2a2d;
  --text: #1d1d1f;           /* 正文 */
  --text-light: #6b7280;     /* 次要文字 */
  --bg: #ffffff;
  --bg-soft: #fff6ec;        /* 暖浅背景 */
  --line: #f3e6d6;           /* 分隔线 */
  --radius: 18px;
  --shadow: 0 8px 30px rgba(246, 130, 31, 0.08);
  --shadow-lg: 0 18px 50px rgba(246, 130, 31, 0.14);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
.container { width: min(1180px, 92%); margin: 0 auto; }

/* ---------- 顶部导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 108px;
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand-logo {
  width: 42px; height: 42px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-weight: 800; font-size: 18px;
  box-shadow: 0 6px 16px rgba(246, 130, 31, 0.35);
}
.brand-name { font-size: 20px; font-weight: 800; color: var(--navy); letter-spacing: 1px; }
.brand-name small { display: block; font-size: 10px; font-weight: 400; color: var(--text-light); letter-spacing: 2px; }
.brand-img { height: 46px; width: auto; display: block; }

.nav-menu { display: flex; align-items: center; gap: 34px; }
.nav-menu a {
  font-size: 15px; color: var(--text); font-weight: 500;
  padding: 6px 0; position: relative; transition: color .2s;
}
.nav-menu a::after {
  content: ""; position: absolute; left: 0; bottom: 0;
  width: 0; height: 2px; background: var(--primary); transition: width .25s;
}
.nav-menu a:hover, .nav-menu a.active { color: var(--primary); }
.nav-menu a:hover::after, .nav-menu a.active::after { width: 100%; }

.nav-cta {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff !important; padding: 9px 20px !important; border-radius: 999px;
  font-weight: 600;
}
.nav-cta::after { display: none; }
.nav-cta:hover { opacity: .92; }

/* 移动端菜单按钮 */
.nav-toggle { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 6px; }
.nav-toggle span { width: 24px; height: 2px; background: var(--navy); border-radius: 2px; transition: .3s; }

/* ---------- 通用区块 ---------- */
.section { padding: 88px 0; }
.section-soft { background: var(--bg-soft); }
.section-head { text-align: center; max-width: 720px; margin: 0 auto 54px; }
.section-head .tag {
  display: inline-block; font-size: 13px; font-weight: 600; color: var(--primary);
  background: rgba(246, 130, 31, 0.08); padding: 4px 14px; border-radius: 999px;
  margin-bottom: 16px; letter-spacing: 1px;
}
.section-head h2 { font-size: 34px; font-weight: 800; color: var(--navy); letter-spacing: 1px; }
.section-head h2 em { font-style: normal; color: var(--primary); }
.section-head p { margin-top: 14px; color: var(--text-light); font-size: 15px; }
.section-head .line { width: 46px; height: 3px; border-radius: 2px; background: var(--primary); margin: 18px auto 0; }

/* ---------- Hero ---------- */
.hero {
  position: relative; overflow: hidden;
  background:
    radial-gradient(900px 500px at 85% -10%, rgba(251, 173, 65, 0.28), transparent 60%),
    radial-gradient(800px 500px at -10% 110%, rgba(246, 130, 31, 0.18), transparent 60%),
    linear-gradient(180deg, #fff8f1 0%, #ffefdf 100%);
}
.hero-grid { position: absolute; inset: 0; opacity: .5;
  background-image: linear-gradient(rgba(246,130,31,.06) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(246,130,31,.06) 1px, transparent 1px);
  background-size: 44px 44px;
}
.hero-inner {
  position: relative; display: grid; grid-template-columns: 1.05fr .95fr;
  gap: 48px; align-items: center; padding: 96px 0;
}
.hero h1 { font-size: 46px; line-height: 1.25; font-weight: 800; color: var(--navy); letter-spacing: 1px; }
.hero h1 em { font-style: normal; background: linear-gradient(90deg, var(--primary), var(--accent)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero p.lead { margin: 22px 0 10px; font-size: 17px; color: var(--text-light); }
.hero .sub { font-size: 14px; color: var(--text-light); }
.hero-btns { display: flex; gap: 16px; margin-top: 34px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 30px; border-radius: 999px; font-size: 15px; font-weight: 600;
  transition: all .25s; cursor: pointer; border: none;
}
.btn-primary { background: linear-gradient(135deg, var(--primary), var(--accent)); color: #fff; box-shadow: 0 8px 22px rgba(246, 130, 31, 0.3); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 28px rgba(246, 130, 31, 0.38); }
.btn-ghost { background: #fff; color: var(--primary); border: 1px solid rgba(246, 130, 31, 0.35); }
.btn-ghost:hover { border-color: var(--primary); background: rgba(246, 130, 31, 0.04); }

/* Hero 右侧可视化面板 */
.hero-visual { position: relative; }
.hero-card {
  background: rgba(255,255,255,.85); backdrop-filter: blur(6px);
  border: 1px solid var(--line); border-radius: 20px; padding: 26px;
  box-shadow: var(--shadow-lg);
}
.hero-card .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); display: inline-block; margin-right: 8px; box-shadow: 0 0 0 4px rgba(251,173,65,.2); }
.hero-card h3 { font-size: 15px; color: var(--navy); font-weight: 700; margin-bottom: 18px; }
.metric-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.metric {
  background: var(--bg-soft); border: 1px solid var(--line); border-radius: 12px; padding: 16px;
}
.metric b { font-size: 26px; color: var(--primary); font-weight: 800; }
.metric span { display: block; font-size: 12px; color: var(--text-light); margin-top: 2px; }
.hero-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.hero-tags i {
  font-style: normal; font-size: 12px; color: var(--primary);
  background: rgba(246,130,31,.08); padding: 5px 12px; border-radius: 999px;
}
.float-badge {
  position: absolute; top: -18px; right: -10px; z-index: 10;
  background: var(--navy); color: #fff; font-size: 12px; padding: 8px 16px; border-radius: 999px;
  box-shadow: var(--shadow); display: flex; align-items: center; gap: 6px;
}
.float-badge i { width: 8px; height: 8px; border-radius: 50%; background: #4cd97b; display: inline-block; }

/* ---------- 业务板块卡片 ---------- */
.service-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.service-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 30px 26px; transition: all .3s; position: relative; overflow: hidden;
}
.service-card::before {
  content: ""; position: absolute; top: 0; left: 0; width: 100%; height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  transform: scaleX(0); transform-origin: left; transition: transform .35s;
}
.service-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: rgba(246,130,31,.25); }
.service-card:hover::before { transform: scaleX(1); }
.service-icon {
  width: 54px; height: 54px; border-radius: 14px; margin-bottom: 20px;
  background: linear-gradient(135deg, rgba(246,130,31,.12), rgba(251,173,65,.16));
  display: flex; align-items: center; justify-content: center; color: var(--primary);
}
.service-card h3 { font-size: 18px; font-weight: 700; color: var(--navy); margin-bottom: 10px; }
.service-card p { font-size: 14px; color: var(--text-light); }
.service-card ul { margin-top: 14px; display: flex; flex-direction: column; gap: 8px; }
.service-card ul li { font-size: 13px; color: var(--text); display: flex; gap: 8px; }
.service-card ul li::before { content: "✓"; color: var(--accent); font-weight: 700; }

/* ---------- 核心优势 ---------- */
.advantage-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.advantage {
  text-align: center; padding: 34px 20px; background: #fff;
  border: 1px solid var(--line); border-radius: var(--radius); transition: .3s;
}
.advantage:hover { box-shadow: var(--shadow); transform: translateY(-4px); }
.advantage .num { font-size: 34px; font-weight: 800; color: var(--primary); }
.advantage .num small { font-size: 16px; }
.advantage h4 { margin: 8px 0 6px; font-size: 16px; color: var(--navy); }
.advantage p { font-size: 13px; color: var(--text-light); }

/* ---------- 解决方案 ---------- */
.solution-list { display: flex; flex-direction: column; gap: 20px; }
.solution-item {
  display: grid; grid-template-columns: 90px 1fr auto; gap: 22px; align-items: center;
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px 28px; transition: .3s;
}
.solution-item:hover { box-shadow: var(--shadow); border-color: rgba(246,130,31,.3); transform: translateX(4px); }
.solution-num { font-size: 30px; font-weight: 800; color: rgba(246,130,31,.25); }
.solution-item h3 { font-size: 18px; color: var(--navy); font-weight: 700; }
.solution-item p { font-size: 14px; color: var(--text-light); margin-top: 4px; }
.solution-item .arrow { color: var(--primary); font-size: 22px; }

/* ---------- 技术生态 / 合作伙伴 ---------- */
.partner-strip { display: flex; flex-wrap: wrap; justify-content: center; gap: 14px; }
.partner-chip {
  background: #fff; border: 1px solid var(--line); border-radius: 999px;
  padding: 10px 26px; font-size: 14px; font-weight: 600; color: var(--text);
  transition: .25s;
}
.partner-chip:hover { border-color: var(--primary); color: var(--primary); box-shadow: var(--shadow); }

/* ---------- 案例 ---------- */
.case-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.case-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; transition: .3s;
}
.case-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-6px); }
.case-top { padding: 22px 24px; background: linear-gradient(135deg, rgba(246,130,31,.06), rgba(251,173,65,.10)); }
.case-top .industry { font-size: 12px; color: var(--primary); font-weight: 600; }
.case-top h3 { font-size: 17px; color: var(--navy); margin-top: 6px; font-weight: 700; }
.case-body { padding: 20px 24px; }
.case-body p { font-size: 14px; color: var(--text-light); }
.case-body .result { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 14px; }
.case-body .result span {
  font-size: 12px; background: rgba(76, 217, 123, 0.12); color: #1d9a52;
  padding: 4px 12px; border-radius: 999px;
}

/* ---------- 流程步骤 ---------- */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; counter-reset: step; }
.step { position: relative; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 30px 22px; text-align: center; }
.step::before {
  counter-increment: step; content: "0" counter(step);
  position: absolute; top: -16px; left: 50%; transform: translateX(-50%);
  width: 34px; height: 34px; border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent)); color: #fff;
  display: flex; align-items: center; justify-content: center; font-size: 14px; font-weight: 700;
}
.step h4 { margin: 10px 0 8px; font-size: 16px; color: var(--navy); }
.step p { font-size: 13px; color: var(--text-light); }

/* ---------- CTA 区块 ---------- */
.cta {
  background:
    radial-gradient(700px 320px at 20% 0%, rgba(251,173,65,.25), transparent 60%),
    linear-gradient(135deg, var(--navy), var(--navy-2));
  color: #fff; text-align: center; padding: 76px 0;
}
.cta h2 { font-size: 32px; font-weight: 800; letter-spacing: 1px; }
.cta p { margin: 16px auto 30px; color: rgba(255,255,255,.7); max-width: 560px; font-size: 15px; }
.cta .btn-ghost { background: transparent; color: #fff; border-color: rgba(255,255,255,.5); }
.cta .btn-ghost:hover { background: rgba(255,255,255,.1); }

/* ---------- 页脚 ---------- */
.site-footer { background: #071126; color: rgba(255,255,255,.7); padding: 60px 0 0; font-size: 14px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 40px; padding-bottom: 44px; }
.footer-grid h4 { color: #fff; font-size: 15px; margin-bottom: 18px; font-weight: 700; }
.footer-grid li { margin-bottom: 10px; }
.footer-grid a:hover { color: var(--accent); }
.footer-brand .brand-name { color: #fff; }
.footer-brand p { margin: 16px 0; font-size: 13px; line-height: 1.8; }
.footer-contact li { display: flex; gap: 10px; align-items: flex-start; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.1); padding: 20px 0; text-align: center;
  font-size: 12px; color: rgba(255,255,255,.45);
}

/* ---------- 内页 Hero（次级页面顶部） ---------- */
.page-hero {
  background:
    radial-gradient(700px 300px at 85% -20%, rgba(251,173,65,.25), transparent 60%),
    linear-gradient(180deg, #fff6ea 0%, #ffefdf 100%);
  padding: 66px 0; text-align: center;
  border-bottom: 1px solid var(--line);
}
.page-hero h1 { font-size: 36px; font-weight: 800; color: var(--navy); }
.page-hero p { margin-top: 12px; color: var(--text-light); font-size: 15px; }
.breadcrumb { margin-top: 16px; font-size: 13px; color: var(--text-light); }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb span { color: var(--primary); }

/* ---------- 关于我们 ---------- */
.about-intro { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.about-intro h2 { font-size: 28px; color: var(--navy); font-weight: 800; margin-bottom: 18px; }
.about-intro p { color: var(--text-light); font-size: 15px; margin-bottom: 14px; }
.about-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.about-card { background: var(--bg-soft); border: 1px solid var(--line); border-radius: 12px; padding: 22px; }
.about-card h4 { color: var(--navy); font-size: 16px; margin-bottom: 8px; display: flex; align-items: center; gap: 8px; }
.about-card p { font-size: 13px; color: var(--text-light); }

/* ---------- 联系我们 ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 40px; }
.contact-info { background: linear-gradient(135deg, var(--navy), var(--navy-2)); color: #fff; border-radius: var(--radius); padding: 40px 36px; }
.contact-info h3 { font-size: 22px; margin-bottom: 8px; }
.contact-info > p { color: rgba(255,255,255,.7); font-size: 14px; margin-bottom: 28px; }
.contact-item { display: flex; gap: 16px; margin-bottom: 24px; align-items: flex-start; }
.contact-item .icon { width: 44px; height: 44px; border-radius: 12px; background: rgba(255,255,255,.12); display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.contact-item h4 { font-size: 14px; color: rgba(255,255,255,.6); font-weight: 500; }
.contact-item a, .contact-item span { font-size: 18px; font-weight: 700; color: #fff; }
.contact-form { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 40px 36px; box-shadow: var(--shadow); }
.contact-form h3 { font-size: 20px; color: var(--navy); margin-bottom: 22px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-size: 13px; color: var(--text); margin-bottom: 6px; font-weight: 500; }
.form-group input, .form-group select, .form-group textarea {
  width: 100%; padding: 12px 14px; border: 1px solid var(--line); border-radius: 10px;
  font-size: 14px; font-family: inherit; color: var(--text); background: var(--bg-soft);
  outline: none; transition: .2s;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
  border-color: var(--primary); background: #fff; box-shadow: 0 0 0 3px rgba(246,130,31,.12);
}
.form-group textarea { resize: vertical; min-height: 120px; }
.form-tip { font-size: 12px; color: var(--text-light); margin-top: 12px; }

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .service-grid, .case-grid { grid-template-columns: repeat(2, 1fr); }
  .advantage-grid { grid-template-columns: repeat(2, 1fr); }
  .hero-inner { grid-template-columns: 1fr; padding: 60px 0; }
  .hero-visual { max-width: 520px; margin: 0 auto; }
  .steps { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .section { padding: 64px 0; }
  .nav-toggle { display: flex; }
  .nav-menu {
    position: fixed; top: 108px; left: 0; right: 0;
    flex-direction: column; gap: 0;
    background: #fff; border-bottom: 1px solid var(--line);
    max-height: 0; overflow: hidden; transition: max-height .35s;
  }
  .nav-menu.open { max-height: 460px; }
  .nav-menu a { width: 100%; padding: 16px 6%; border-bottom: 1px solid var(--line); }
  .nav-cta { border-radius: 0; justify-content: center; }

  .hero h1 { font-size: 32px; }
  .service-grid, .case-grid, .advantage-grid { grid-template-columns: 1fr; }
  .solution-item { grid-template-columns: 1fr; text-align: left; gap: 8px; }
  .steps { grid-template-columns: 1fr; }
  .about-intro, .contact-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 28px; }
}

@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
}