/* ============================================================
   千翊新澄 · 公司官网静态站样式
   设计基调：专业 / 科技 / 清爽；主色深蓝 + 青色点缀
   注意：以下文案为占位模板，标注【待补充】处需替换为真实内容
   ============================================================ */

:root {
  --c-primary: #1e40af;      /* 主色 深蓝 */
  --c-primary-d: #1e3a8a;    /* 主色深 */
  --c-accent: #06b6d4;       /* 点缀 青 */
  --c-bg: #f7f9fc;           /* 页面底色 */
  --c-surface: #ffffff;       /* 卡片/区块底色 */
  --c-text: #1f2937;         /* 正文 */
  --c-text-soft: #5b6472;    /* 次要文字 */
  --c-border: #e5e9f0;
  --c-footer: #0f172a;
  --radius: 14px;
  --shadow: 0 8px 30px rgba(30, 64, 175, 0.08);
  --maxw: 1180px;
  --nav-h: 64px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--c-text);
  background: var(--c-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 20px;
}

/* ---------------- 导航 ---------------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-h);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(160%) blur(10px);
  border-bottom: 1px solid var(--c-border);
}
.nav .container {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 19px;
  color: var(--c-primary);
}
.brand .logo {
  width: 34px; height: 34px;
  border-radius: 9px;
  background: linear-gradient(135deg, var(--c-primary), var(--c-accent));
  color: #fff;
  display: grid; place-items: center;
  font-size: 16px; letter-spacing: 1px;
}
.nav-links {
  display: flex;
  gap: 26px;
  align-items: center;
  font-size: 15px;
}
.nav-links a { color: var(--c-text-soft); transition: color .2s; }
.nav-links a:hover, .nav-links a.active { color: var(--c-primary); }
.nav-cta {
  background: var(--c-primary);
  color: #fff !important;
  padding: 9px 18px;
  border-radius: 999px;
  font-weight: 600;
}
.nav-toggle { display: none; background: none; border: 0; font-size: 26px; cursor: pointer; color: var(--c-primary); }

/* ---------------- 通用区块 ---------------- */
section { padding: 72px 0; }
.section-head { text-align: center; margin-bottom: 44px; }
.section-head .eyebrow {
  color: var(--c-accent);
  font-weight: 700;
  letter-spacing: 2px;
  font-size: 13px;
  text-transform: uppercase;
}
.section-head h2 {
  font-size: 30px;
  margin: 10px 0 12px;
  color: var(--c-primary-d);
}
.section-head p { color: var(--c-text-soft); max-width: 660px; margin: 0 auto; }

.btn {
  display: inline-block;
  padding: 13px 26px;
  border-radius: 999px;
  font-weight: 600;
  transition: transform .15s, box-shadow .2s;
}
.btn-primary { background: var(--c-primary); color: #fff; }
.btn-primary:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.btn-ghost { border: 1.5px solid var(--c-primary); color: var(--c-primary); }
.btn-ghost:hover { background: var(--c-primary); color: #fff; }

/* ---------------- Hero ---------------- */
.hero {
  background:
    radial-gradient(1200px 500px at 80% -10%, rgba(6,182,212,.18), transparent),
    linear-gradient(180deg, #eef3ff 0%, #f7f9fc 100%);
  padding: 88px 0 76px;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr .9fr;
  gap: 48px;
  align-items: center;
}
.hero h1 {
  font-size: 44px;
  line-height: 1.25;
  margin: 0 0 18px;
  color: var(--c-primary-d);
}
.hero .tag { color: var(--c-text-soft); font-size: 18px; margin-bottom: 28px; }
.hero .actions { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-visual {
  background: linear-gradient(135deg, var(--c-primary), var(--c-accent));
  border-radius: 20px;
  padding: 30px;
  color: #fff;
  box-shadow: var(--shadow);
}
.hero-visual .stat { display: flex; justify-content: space-between; padding: 14px 0; border-bottom: 1px solid rgba(255,255,255,.18); }
.hero-visual .stat:last-child { border-bottom: 0; }
.hero-visual .stat b { font-size: 26px; }
.placeholder-tag {
  display: inline-block;
  font-size: 12px;
  background: rgba(255,255,255,.22);
  padding: 2px 8px;
  border-radius: 6px;
  margin-left: 8px;
  vertical-align: middle;
}

/* ---------------- 卡片栅格 ---------------- */
.grid { display: grid; gap: 24px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }

.card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 28px;
  transition: transform .18s, box-shadow .18s;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.card .ico {
  width: 46px; height: 46px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--c-primary), var(--c-accent));
  color: #fff; display: grid; place-items: center; font-size: 22px;
  margin-bottom: 16px;
}
.card h3 { margin: 0 0 8px; font-size: 19px; color: var(--c-primary-d); }
.card p { color: var(--c-text-soft); margin: 0; font-size: 15px; }

/* ---------------- 案例 ---------------- */
.case {
  border-left: 4px solid var(--c-accent);
  background: var(--c-surface);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 24px 26px;
}
.case h3 { margin: 0 0 6px; color: var(--c-primary-d); }
.case .meta { font-size: 13px; color: var(--c-accent); font-weight: 600; margin-bottom: 10px; }
.case p { color: var(--c-text-soft); margin: 0; }

/* ---------------- 关于/时间线 ---------------- */
.timeline { border-left: 2px solid var(--c-border); margin-left: 8px; padding-left: 26px; }
.timeline .item { position: relative; padding-bottom: 26px; }
.timeline .item::before {
  content: ""; position: absolute; left: -33px; top: 4px;
  width: 12px; height: 12px; border-radius: 50%;
  background: var(--c-accent); border: 3px solid #fff; box-shadow: 0 0 0 2px var(--c-accent);
}
.timeline .item b { color: var(--c-primary-d); }

/* ---------------- 联系 ---------------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 36px; align-items: start; }
.info-list li { list-style: none; padding: 12px 0; border-bottom: 1px solid var(--c-border); display: flex; gap: 12px; }
.info-list li span:first-child { color: var(--c-accent); font-weight: 700; min-width: 64px; }
.form input, .form textarea {
  width: 100%; padding: 12px 14px; margin-bottom: 14px;
  border: 1px solid var(--c-border); border-radius: 10px; font-size: 15px; font-family: inherit;
}
.form textarea { min-height: 120px; resize: vertical; }
.form button { width: 100%; }

/* ---------------- 页脚 ---------------- */
footer {
  background: var(--c-footer);
  color: #cbd5e1;
  padding: 48px 0 26px;
}
footer .cols { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 30px; }
footer h4 { color: #fff; margin: 0 0 16px; font-size: 16px; }
footer a { color: #cbd5e1; font-size: 14px; line-height: 2; }
footer a:hover { color: #fff; }
footer .brand { color: #fff; margin-bottom: 12px; }
.footer-bottom {
  margin-top: 34px; padding-top: 18px; border-top: 1px solid rgba(255,255,255,.12);
  font-size: 13px; color: #94a3b8; text-align: center;
}
.footer-bottom a { color: var(--c-accent); }

/* ---------------- 响应式 ---------------- */
@media (max-width: 880px) {
  .nav-links {
    position: absolute; top: var(--nav-h); left: 0; right: 0;
    background: #fff; flex-direction: column; gap: 0; padding: 8px 0;
    border-bottom: 1px solid var(--c-border);
    display: none;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px 20px; }
  .nav-toggle { display: block; }
  .hero-grid { grid-template-columns: 1fr; gap: 30px; }
  .hero h1 { font-size: 32px; }
  .grid-3, .grid-2, .contact-grid, footer .cols { grid-template-columns: 1fr; }
  section { padding: 54px 0; }
  .section-head h2 { font-size: 24px; }
}