/* 金丝线公司官网 · 纯静态无 JS · 2026-08 */
:root {
  --ink: #16241f;
  --ink-soft: #476057;
  --paper: #faf9f5;
  --paper-muted: #f1efe7;
  --green: #0e3a2f;
  --green-deep: #0a2b23;
  --gold: #c99a3f;
  --gold-bright: #e8c476;
  --line: #e2ddcf;
  --card: #ffffff;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(22, 36, 31, .05), 0 8px 24px rgba(22, 36, 31, .06);
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", sans-serif;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img, svg { display: block; }
.container { max-width: 1080px; margin: 0 auto; padding: 0 24px; }

/* ---------- header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(250, 249, 245, .92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.header-inner { display: flex; align-items: center; gap: 28px; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; }
.brand-mark { width: 30px; height: 30px; }
.brand-text { font-size: 18px; font-weight: 700; letter-spacing: .04em; color: var(--green); }
.brand-text em { font-style: normal; font-size: 11px; font-weight: 600; letter-spacing: .22em; color: var(--gold); margin-left: 8px; }
.site-nav { display: flex; gap: 22px; margin-left: auto; font-size: 14.5px; color: var(--ink-soft); }
.site-nav a:hover { color: var(--green); }

/* ---------- buttons ---------- */
.btn {
  display: inline-block; padding: 12px 26px; border-radius: 999px;
  font-size: 15px; font-weight: 600; transition: all .18s ease; cursor: pointer;
}
.btn-primary { background: linear-gradient(135deg, var(--green), var(--green-deep)); color: #fff; box-shadow: 0 6px 18px rgba(14, 58, 47, .25); }
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 10px 24px rgba(14, 58, 47, .32); }
.btn-ghost { border: 1px solid var(--line); color: var(--green); background: #fff; }
.btn-ghost:hover { border-color: var(--gold); }
.btn-sm { padding: 8px 18px; font-size: 13.5px; }

/* ---------- hero ---------- */
.hero {
  position: relative;
  padding: 96px 0 88px;
  background:
    radial-gradient(900px 420px at 82% -10%, rgba(201, 154, 63, .14), transparent 65%),
    radial-gradient(700px 380px at 8% 108%, rgba(14, 58, 47, .08), transparent 60%),
    var(--paper);
  overflow: hidden;
}
.eyebrow { font-size: 13.5px; font-weight: 600; letter-spacing: .18em; color: var(--gold); margin-bottom: 18px; }
.hero h1 { font-size: clamp(34px, 6vw, 56px); line-height: 1.25; letter-spacing: .01em; color: var(--green-deep); }
.hero-sub { margin-top: 22px; max-width: 640px; font-size: 17.5px; color: var(--ink-soft); }
.hero-sub strong { color: var(--ink); }
.hero-cta { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 36px; }
.gold-thread {
  position: absolute; left: -5%; right: -5%; bottom: 0; height: 3px;
  background: linear-gradient(90deg, transparent, var(--gold-bright) 18%, var(--gold) 50%, var(--gold-bright) 82%, transparent);
  opacity: .85;
}

/* ---------- stats ---------- */
.stats { background: var(--green); color: #eef3f0; padding: 40px 0 26px; }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; text-align: center; }
.stat strong { display: block; font-size: 32px; font-weight: 700; color: var(--gold-bright); }
.stat span { font-size: 13.5px; opacity: .85; }
.stats-note { margin-top: 14px; font-size: 12px; opacity: .55; text-align: center; }

/* ---------- sections ---------- */
.section { padding: 84px 0; }
.section-muted { background: var(--paper-muted); }
.section-title { font-size: 30px; color: var(--green-deep); margin-bottom: 14px; letter-spacing: .02em; }
.section-title::after {
  content: ""; display: block; width: 56px; height: 3px; margin-top: 12px; border-radius: 2px;
  background: linear-gradient(90deg, var(--gold-bright), var(--gold));
}
.lead { max-width: 760px; color: var(--ink-soft); font-size: 16.5px; margin-bottom: 44px; }

/* ---------- about ---------- */
.biz-lines { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.biz-card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow); }
.biz-card h3 { font-size: 15.5px; color: var(--green); margin-bottom: 8px; }
.biz-card p { font-size: 13.5px; color: var(--ink-soft); }

/* ---------- mission ---------- */
.mission-grid { display: grid; grid-template-columns: 1fr 1.25fr; gap: 20px; }
.mission-card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 32px; box-shadow: var(--shadow); }
.mission-card h3 { font-size: 21px; color: var(--green-deep); margin: 6px 0 12px; line-height: 1.4; }
.mission-card p { font-size: 14.5px; color: var(--ink-soft); }
.mission-tag { font-size: 12.5px; font-weight: 700; letter-spacing: .2em; color: var(--gold); }
.mission-accent { background: linear-gradient(150deg, var(--green), var(--green-deep)); border-color: var(--green-deep); }
.mission-accent h3 { color: #fff; }
.mission-accent p { color: rgba(238, 243, 240, .85); }
.mission-accent .mission-tag { color: var(--gold-bright); }

/* ---------- products ---------- */
.product-card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 30px; box-shadow: var(--shadow); }
.product-hero-card { border-top: 3px solid var(--gold); margin-bottom: 18px; }
.product-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 20px; flex-wrap: wrap; margin-bottom: 26px; }
.product-head h3 { font-size: 24px; color: var(--green-deep); margin: 4px 0 8px; }
.product-sub { max-width: 560px; font-size: 14.5px; color: var(--ink-soft); }
.product-tag { font-size: 12.5px; font-weight: 700; letter-spacing: .14em; color: var(--gold); }
.capability-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.cap { background: var(--paper-muted); border-radius: 10px; padding: 18px; }
.cap h4 { font-size: 14.5px; color: var(--green); margin-bottom: 6px; }
.cap p { font-size: 12.8px; color: var(--ink-soft); line-height: 1.65; }
.product-platforms { margin-top: 20px; font-size: 13px; color: var(--ink-soft); border-top: 1px dashed var(--line); padding-top: 16px; }
.product-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.product-row h3 { font-size: 18.5px; color: var(--green-deep); margin: 6px 0 10px; }
.product-row p { font-size: 14px; color: var(--ink-soft); }

/* ---------- tech ---------- */
.tech-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.tech-card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow); }
.tech-card h4 { font-size: 16px; color: var(--green); margin-bottom: 8px; }
.tech-card p { font-size: 13.5px; color: var(--ink-soft); }

/* ---------- milestones ---------- */
.timeline { list-style: none; max-width: 760px; }
.timeline li { display: flex; gap: 26px; padding-bottom: 34px; position: relative; }
.timeline li::before {
  content: ""; position: absolute; left: 86px; top: 26px; bottom: -4px; width: 2px;
  background: linear-gradient(var(--gold-bright), var(--line));
}
.timeline li:last-child::before { display: none; }
.timeline time {
  flex: 0 0 64px; font-weight: 700; color: var(--gold); font-size: 15px;
  padding-top: 2px; text-align: right;
}
.timeline > li::after {
  content: ""; position: absolute; left: 81px; top: 8px; width: 12px; height: 12px;
  border-radius: 50%; background: var(--gold); box-shadow: 0 0 0 4px rgba(201, 154, 63, .18);
}
.timeline h4 { font-size: 16.5px; color: var(--green-deep); margin-bottom: 4px; }
.timeline p { font-size: 14px; color: var(--ink-soft); }

/* ---------- sites ---------- */
.sites-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.site-card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 28px; box-shadow: var(--shadow); transition: all .18s ease; }
.site-card:hover { transform: translateY(-3px); border-color: var(--gold); box-shadow: 0 12px 28px rgba(22, 36, 31, .1); }
.site-card h3 { font-size: 18px; color: var(--green-deep); margin: 6px 0 8px; }
.site-card p { font-size: 14px; color: var(--ink-soft); }
.site-tag { font-size: 12.5px; font-weight: 700; letter-spacing: .14em; color: var(--gold); }

/* ---------- contact ---------- */
.contact { background: linear-gradient(180deg, var(--paper), var(--paper-muted)); }
.contact-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.contact-card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow); }
.contact-card h4 { font-size: 14.5px; color: var(--green); margin-bottom: 8px; }
.contact-card p { font-size: 15.5px; font-weight: 600; color: var(--ink); }
.contact-card a:hover { color: var(--gold); }
.contact-note { font-size: 12.5px !important; font-weight: 400 !important; color: var(--ink-soft) !important; margin-top: 6px; }

/* ---------- footer ---------- */
.site-footer { background: var(--green-deep); color: rgba(238, 243, 240, .8); padding: 44px 0 26px; }
.footer-inner { display: flex; align-items: flex-start; justify-content: space-between; gap: 24px; flex-wrap: wrap; padding-bottom: 26px; border-bottom: 1px solid rgba(238, 243, 240, .14); }
.footer-brand .brand-text { color: #fff; }
.footer-brand .brand-text em { color: var(--gold-bright); }
.footer-brand p { font-size: 13px; margin-top: 8px; opacity: .75; }
.footer-nav { display: flex; gap: 22px; font-size: 13.5px; }
.footer-nav a:hover { color: var(--gold-bright); }
.footer-legal { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; padding-top: 18px; font-size: 12.5px; opacity: .65; }
.footer-legal a:hover { color: var(--gold-bright); }

/* ---------- contact(含企业微信二维码) ---------- */
.contact-wrap { display: grid; grid-template-columns: 1.6fr 1fr; gap: 24px; align-items: stretch; }
.contact-qr {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 28px; box-shadow: var(--shadow); text-align: center;
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 10px;
}
.contact-qr img { width: 220px; height: 220px; border-radius: 10px; border: 1px solid var(--line); }
.contact-qr h4 { font-size: 16px; color: var(--green); }
.contact-qr p { font-size: 13px; color: var(--ink-soft); }

/* ---------- 语言切换(footer) ---------- */
.footer-lang { padding-top: 18px; }
.lang-switch { display: flex; flex-wrap: wrap; gap: 8px; }
.lang-pill {
  font-size: 12.5px; color: rgba(238, 243, 240, .75);
  border: 1px solid rgba(238, 243, 240, .22); border-radius: 999px; padding: 3px 12px;
}
.lang-pill:hover { color: var(--gold-bright); border-color: var(--gold); }
.lang-pill.current { color: var(--gold-bright); border-color: var(--gold); background: rgba(201, 154, 63, .14); }

/* ---------- RTL(ar/fa) ---------- */
[dir="rtl"] .timeline li { flex-direction: row-reverse; }
[dir="rtl"] .timeline time { text-align: left; }
[dir="rtl"] .timeline > li::after { left: auto; right: 81px; }
[dir="rtl"] .timeline li::before { left: auto; right: 76px; }
[dir="rtl"] .site-nav a, [dir="rtl"] .footer-nav a { direction: rtl; }
[dir="rtl"] .section-title::after { margin-left: 0; margin-right: 0; }

/* ---------- responsive ---------- */
@media (max-width: 900px) {
  .site-nav { display: none; }
  .biz-lines, .capability-grid, .contact-grid { grid-template-columns: repeat(2, 1fr); }
  .tech-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); row-gap: 26px; }
  .mission-grid, .product-row, .sites-grid { grid-template-columns: 1fr; }
  .contact-wrap { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
  .section { padding: 60px 0; }
  .hero { padding: 64px 0 56px; }
  .tech-grid { grid-template-columns: 1fr; }
  .timeline time { flex-basis: 54px; font-size: 13.5px; }
  .timeline > li::after { left: 70px; }
  .timeline li::before { left: 76px; }
}

/* ---------- 页脚免责声明 ---------- */
.footer-disclaimer { padding-top: 14px; font-size: 12px; line-height: 1.7; opacity: .55; max-width: 860px; }
.footer-disclaimer p + p { margin-top: 4px; }