/* ============================================================
   Xinrui Electronics — 站点样式
   设计取向：干净、可信、偏欧美 B2B 风格，不用花哨动效
   ============================================================ */

:root {
  --navy: #0b1e33;
  --navy-2: #123049;
  --ink: #16232f;
  --body: #3d4d5c;
  --muted: #6b7c8d;
  --line: #e2e8ee;
  --bg: #ffffff;
  --bg-soft: #f6f8fa;
  --accent: #0d7d7d;
  --accent-2: #ffb02e;
  --accent-soft: #e6f4f4;
  --ok: #1a7f45;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(11, 30, 51, .05), 0 8px 24px -12px rgba(11, 30, 51, .18);
  --max: 1160px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.65;
  color: var(--body);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

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

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

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

/* ---------- 顶栏 ---------- */
.topbar {
  background: var(--navy);
  color: #b9c9d8;
  font-size: 13px;
  padding: 7px 0;
}
.topbar .wrap { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.topbar strong { color: #fff; font-weight: 600; }

header.site {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, .92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
header.site .wrap {
  display: flex; align-items: center; justify-content: space-between;
  gap: 20px; height: 68px;
}
.logo { display: flex; align-items: center; gap: 10px; font-weight: 700; color: var(--navy); font-size: 17px; letter-spacing: -.2px; }
.logo:hover { text-decoration: none; }
.logo-mark {
  width: 34px; height: 34px; border-radius: 8px;
  background: linear-gradient(135deg, var(--navy) 0%, var(--accent) 100%);
  display: grid; place-items: center; color: #fff; font-size: 15px; font-weight: 800;
  flex: none;
}
.logo small { display: block; font-size: 11px; font-weight: 500; color: var(--muted); letter-spacing: .3px; }

nav.main { display: flex; align-items: center; gap: 26px; }
nav.main a { color: var(--ink); font-size: 14.5px; font-weight: 500; }
nav.main a:hover { color: var(--accent); text-decoration: none; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 11px 20px; border-radius: 8px; font-size: 14.5px; font-weight: 600;
  border: 1px solid transparent; cursor: pointer; transition: .15s ease;
  font-family: inherit; white-space: nowrap;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: #0a6a6a; }
.btn-ghost { background: transparent; color: var(--navy); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }
.btn-light { background: #fff; color: var(--navy); }
.btn-light:hover { background: #f0f4f7; }
.btn-lg { padding: 14px 26px; font-size: 15.5px; }

/* ---------- 首屏 ---------- */
.hero {
  background:
    radial-gradient(1000px 500px at 85% -10%, rgba(13, 125, 125, .28), transparent 60%),
    linear-gradient(160deg, var(--navy) 0%, var(--navy-2) 55%, #0d3d4a 100%);
  color: #dbe6ef;
  padding: 76px 0 84px;
  position: relative;
  overflow: hidden;
}
.hero::after {
  content: ""; position: absolute; inset: 0;
  background-image: linear-gradient(rgba(255,255,255,.03) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(255,255,255,.03) 1px, transparent 1px);
  background-size: 44px 44px;
  pointer-events: none;
}
.hero .wrap { position: relative; z-index: 1; display: grid; grid-template-columns: 1.15fr .85fr; gap: 56px; align-items: center; }

.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(255, 255, 255, .1); border: 1px solid rgba(255,255,255,.18);
  color: #9fe6e6; font-size: 12.5px; font-weight: 600; letter-spacing: .4px;
  padding: 6px 13px; border-radius: 100px; margin-bottom: 22px;
}
.eyebrow .dot { width: 6px; height: 6px; border-radius: 50%; background: #35d0c0; }

.hero h1 {
  font-size: 46px; line-height: 1.15; margin: 0 0 20px;
  color: #fff; font-weight: 750; letter-spacing: -1.1px;
}
.hero h1 em { font-style: normal; color: #4fd1c5; }
.hero p.lead { font-size: 17.5px; color: #b9cdda; margin: 0 0 30px; max-width: 540px; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }

.hero-card {
  background: rgba(255, 255, 255, .06);
  border: 1px solid rgba(255, 255, 255, .14);
  border-radius: 14px;
  padding: 24px;
  backdrop-filter: blur(6px);
}
.hero-card h3 { margin: 0 0 4px; color: #fff; font-size: 15px; font-weight: 650; }
.hero-card p.sub { margin: 0 0 18px; font-size: 13px; color: #93aebf; }
.hero-stats { display: grid; gap: 14px; }
.hero-stat { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; padding-bottom: 13px; border-bottom: 1px solid rgba(255,255,255,.09); }
.hero-stat:last-child { border-bottom: 0; padding-bottom: 0; }
.hero-stat span { font-size: 13.5px; color: #9db3c4; }
.hero-stat b { color: #fff; font-size: 15px; font-weight: 650; }
.hero-stat b.hot { color: #ffcb6b; }

/* ---------- 信任条 ---------- */
.trust { background: var(--bg-soft); border-bottom: 1px solid var(--line); padding: 20px 0; }
.trust .wrap { display: flex; gap: 34px; flex-wrap: wrap; justify-content: center; }
.trust-item { display: flex; align-items: center; gap: 9px; font-size: 13.5px; color: var(--ink); font-weight: 550; }
.trust-item svg { flex: none; color: var(--accent); }

/* ---------- 通用区块 ---------- */
section { padding: 76px 0; }
section.tight { padding: 56px 0; }
section.soft { background: var(--bg-soft); }

.sec-head { max-width: 700px; margin-bottom: 44px; }
.sec-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.sec-tag { font-size: 12.5px; font-weight: 700; letter-spacing: .9px; color: var(--accent); text-transform: uppercase; margin-bottom: 12px; }
.sec-head h2 { font-size: 33px; line-height: 1.25; color: var(--navy); margin: 0 0 14px; letter-spacing: -.7px; font-weight: 720; }
.sec-head p { font-size: 16.5px; color: var(--muted); margin: 0; }

/* ---------- 卡片网格 ---------- */
.grid { display: grid; gap: 22px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }

.card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px; transition: .18s ease;
}
.card:hover { border-color: #c9d6e2; box-shadow: var(--shadow); transform: translateY(-2px); }
.card .ico {
  width: 42px; height: 42px; border-radius: 9px; background: var(--accent-soft);
  color: var(--accent); display: grid; place-items: center; margin-bottom: 16px;
}
.card h3 { margin: 0 0 8px; font-size: 16.5px; color: var(--navy); font-weight: 650; }
.card p { margin: 0; font-size: 14.5px; color: var(--body); }
.card .note { margin-top: 12px; font-size: 13px; color: var(--ok); font-weight: 600; }

/* ---------- 问题/解决 对照 ---------- */
.solve-row {
  display: grid; grid-template-columns: 1fr 1fr; gap: 0;
  border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden;
  background: #fff; margin-bottom: 12px;
}
.solve-row > div { padding: 20px 24px; }
.solve-row .prob { background: #fff; border-right: 1px solid var(--line); color: var(--body); font-size: 15px; }
.solve-row .prob b { display: block; color: var(--navy); font-size: 14px; font-weight: 650; margin-bottom: 3px; }
.solve-row .answ { background: var(--accent-soft); font-size: 14.5px; color: #0a5f5f; display: flex; align-items: center; gap: 10px; }
.solve-row .answ svg { flex: none; }

/* ---------- 品牌 ---------- */
.brands { display: grid; grid-template-columns: repeat(6, 1fr); gap: 14px; }
.brand {
  border: 1px solid var(--line); border-radius: 9px; padding: 18px 12px;
  text-align: center; background: #fff;
}
.brand b { display: block; font-size: 17px; color: var(--navy); font-weight: 750; letter-spacing: -.3px; }
.brand span { font-size: 11.5px; color: var(--muted); }

/* ---------- 参数表 ---------- */
.spec-table { width: 100%; border-collapse: collapse; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.spec-table th, .spec-table td { text-align: left; padding: 14px 18px; border-bottom: 1px solid var(--line); font-size: 14.5px; }
.spec-table th { background: var(--bg-soft); color: var(--navy); font-weight: 650; width: 210px; }
.spec-table tr:last-child th, .spec-table tr:last-child td { border-bottom: 0; }

/* ---------- CTA ---------- */
.cta {
  background: linear-gradient(150deg, var(--navy) 0%, #0d3346 60%, #0e4a4a 100%);
  color: #fff; border-radius: 16px; padding: 52px 48px;
  display: grid; grid-template-columns: 1.2fr .8fr; gap: 40px; align-items: center;
}
.cta h2 { margin: 0 0 12px; font-size: 30px; letter-spacing: -.6px; font-weight: 720; }
.cta p { margin: 0; color: #b9cdda; font-size: 16px; }
.cta .actions { display: flex; flex-direction: column; gap: 11px; }
.cta .actions .btn { width: 100%; }
.cta .hint { font-size: 12.5px; color: #8fa8ba; text-align: center; }

/* ---------- 联系 ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
.contact-item { display: flex; gap: 14px; padding: 18px 0; border-bottom: 1px solid var(--line); }
.contact-item:last-child { border-bottom: 0; }
.contact-item .ico { flex: none; width: 40px; height: 40px; border-radius: 9px; background: var(--accent-soft); color: var(--accent); display: grid; place-items: center; }
.contact-item b { display: block; color: var(--navy); font-size: 14px; margin-bottom: 2px; }
.contact-item span, .contact-item a { font-size: 14.5px; color: var(--body); }

form.enquiry { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 26px; }
form.enquiry label { display: block; font-size: 13px; font-weight: 600; color: var(--navy); margin: 0 0 6px; }
form.enquiry .field { margin-bottom: 15px; }
form.enquiry input, form.enquiry textarea, form.enquiry select {
  width: 100%; padding: 10px 12px; border: 1px solid #d3dce5; border-radius: 7px;
  font-family: inherit; font-size: 14.5px; color: var(--ink); background: #fff;
}
form.enquiry input:focus, form.enquiry textarea:focus, form.enquiry select:focus {
  outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(13,125,125,.12);
}
form.enquiry textarea { min-height: 104px; resize: vertical; }
form.enquiry .row2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }

/* ---------- 页脚 ---------- */
footer.site { background: var(--navy); color: #93aebf; padding: 52px 0 26px; font-size: 14px; }
footer.site .cols { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 36px; margin-bottom: 34px; }
footer.site h4 { color: #fff; font-size: 13.5px; margin: 0 0 14px; font-weight: 650; letter-spacing: .3px; }
footer.site a { color: #93aebf; display: block; margin-bottom: 9px; font-size: 13.5px; }
footer.site a:hover { color: #fff; text-decoration: none; }
footer.site .logo { color: #fff; margin-bottom: 14px; }
footer.site .logo small { color: #7d97a9; }
footer.site p.about { margin: 0; font-size: 13.5px; line-height: 1.7; max-width: 320px; }
footer.site .bottom {
  border-top: 1px solid rgba(255,255,255,.1); padding-top: 22px;
  display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; font-size: 12.5px; color: #6f8a9d;
}

/* ---------- 响应式 ---------- */
@media (max-width: 980px) {
  .hero .wrap { grid-template-columns: 1fr; gap: 36px; }
  .hero h1 { font-size: 36px; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .brands { grid-template-columns: repeat(3, 1fr); }
  .cta { grid-template-columns: 1fr; padding: 36px 28px; text-align: center; }
  .contact-grid { grid-template-columns: 1fr; gap: 28px; }
  footer.site .cols { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  nav.main { display: none; }
  .hero { padding: 52px 0 60px; }
  .hero h1 { font-size: 30px; letter-spacing: -.6px; }
  section { padding: 52px 0; }
  .sec-head h2 { font-size: 25px; }
  .grid-4, .grid-3, .grid-2, .brands { grid-template-columns: 1fr; }
  .solve-row { grid-template-columns: 1fr; }
  .solve-row .prob { border-right: 0; border-bottom: 1px solid var(--line); }
  .spec-table th { width: auto; }
  form.enquiry .row2 { grid-template-columns: 1fr; }
  footer.site .cols { grid-template-columns: 1fr; }
  .topbar .wrap { justify-content: center; text-align: center; }
}