/* ==========================================================================
   苏州晟昱安供应链管理有限公司 — 官网样式
   astrumlinksc.com
   ========================================================================== */

:root {
  --navy: #0B2E4F;
  --navy-deep: #071E36;
  --steel: #2E6DA4;
  --steel-light: #5B8FC7;
  --amber: #E8A020;
  --amber-light: #F5C86A;
  --ink: #1C2B3A;
  --gray: #6B7C8D;
  --line: #E2E8EF;
  --bg-soft: #F6F9FC;
  --white: #FFFFFF;
  --radius: 4px;
  --maxw: 1180px;
}

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

body {
  font-family: "Microsoft YaHei", "PingFang SC", "Hiragino Sans GB", sans-serif;
  color: var(--ink);
  background: var(--white);
  line-height: 1.7;
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
}

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

.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- 顶部公告条 ---------- */
.topbar {
  background: var(--navy-deep);
  color: #9FB6CC;
  font-size: 13px;
  padding: 7px 0;
}
.topbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.topbar a { color: var(--amber); text-decoration: none; }
.topbar a:hover { text-decoration: underline; }

/* ---------- 主导航 ---------- */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--white);
  border-bottom: 1px solid var(--line);
}
.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}

.logo { display: flex; align-items: center; gap: 12px; text-decoration: none; }
.logo-mark {
  width: 42px; height: 42px;
  background: var(--navy);
  border-radius: var(--radius);
  display: flex; align-items: center; justify-content: center;
  color: var(--amber);
  font-size: 22px; font-weight: 700;
  flex-shrink: 0;
}
.logo-text { line-height: 1.25; }
.logo-cn { font-size: 17px; font-weight: 700; color: var(--navy); letter-spacing: .5px; }
.logo-en { font-size: 11px; color: var(--gray); letter-spacing: .6px; text-transform: uppercase; }

.nav { display: flex; align-items: center; gap: 34px; }
.nav a {
  color: var(--ink);
  text-decoration: none;
  font-size: 15px;
  position: relative;
  padding: 4px 0;
  transition: color .2s;
}
.nav a::after {
  content: '';
  position: absolute;
  left: 0; bottom: 0;
  width: 0; height: 2px;
  background: var(--amber);
  transition: width .25s;
}
.nav a:hover { color: var(--navy); }
.nav a:hover::after { width: 100%; }

.nav-cta {
  background: var(--navy);
  color: var(--white) !important;
  padding: 9px 22px !important;
  border-radius: var(--radius);
  font-size: 14px;
}
.nav-cta::after { display: none; }
.nav-cta:hover { background: var(--steel); }

/* ---------- 移动端菜单按钮 ---------- */
.nav-toggle {
  display: none;
  background: none;
  border: 0;
  font-size: 26px;
  color: var(--navy);
  cursor: pointer;
  line-height: 1;
  padding: 4px 8px;
}

/* ---------- Hero ---------- */
.hero {
  background: linear-gradient(120deg, var(--navy-deep) 0%, var(--navy) 55%, #12456E 100%);
  color: var(--white);
  padding: 96px 0 104px;
  position: relative;
  overflow: hidden;
}
.hero::after {
  content: '';
  position: absolute;
  right: -140px; top: -140px;
  width: 460px; height: 460px;
  border-radius: 50%;
  background: rgba(232, 160, 32, .09);
}
.hero::before {
  content: '';
  position: absolute;
  right: 60px; bottom: -220px;
  width: 380px; height: 380px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, .12);
}
.hero .container { position: relative; z-index: 2; }
.hero-tag {
  display: inline-block;
  border: 1px solid rgba(232, 160, 32, .55);
  color: var(--amber-light);
  font-size: 13px;
  letter-spacing: 2px;
  padding: 5px 16px;
  border-radius: 2px;
  margin-bottom: 24px;
}
.hero h1 {
  font-size: 42px;
  line-height: 1.35;
  font-weight: 700;
  margin-bottom: 22px;
  max-width: 800px;
}
.hero h1 span { color: var(--amber); }
.hero p.lead {
  font-size: 17px;
  color: #C3D4E4;
  max-width: 640px;
  margin-bottom: 38px;
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.btn {
  display: inline-block;
  padding: 13px 34px;
  border-radius: var(--radius);
  font-size: 15px;
  text-decoration: none;
  transition: all .22s;
  border: 1px solid transparent;
}
.btn-primary { background: var(--amber); color: var(--navy-deep); font-weight: 700; }
.btn-primary:hover { background: var(--amber-light); }
.btn-ghost { border-color: rgba(255,255,255,.4); color: var(--white); }
.btn-ghost:hover { border-color: var(--amber); color: var(--amber-light); }

/* ---------- 通用区块 ---------- */
.section { padding: 88px 0; }
.section.alt { background: var(--bg-soft); }
.section-head { text-align: center; max-width: 760px; margin: 0 auto 56px; }
.section-eyebrow {
  color: var(--steel);
  font-size: 13px;
  letter-spacing: 3px;
  text-transform: uppercase;
  margin-bottom: 12px;
  font-weight: 600;
}
.section-head h2 {
  font-size: 32px;
  color: var(--navy);
  margin-bottom: 16px;
  font-weight: 700;
}
.section-head p { color: var(--gray); font-size: 16px; }

.divider { width: 56px; height: 3px; background: var(--amber); margin: 0 auto 18px; }

/* ---------- 能力卡片 ---------- */
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; }

.card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 32px 26px;
  transition: all .25s;
}
.card:hover {
  border-color: var(--steel-light);
  box-shadow: 0 10px 30px rgba(11, 46, 79, .09);
  transform: translateY(-3px);
}
.card-icon {
  width: 52px; height: 52px;
  background: rgba(11, 46, 79, .06);
  border-radius: var(--radius);
  display: flex; align-items: center; justify-content: center;
  font-size: 25px;
  margin-bottom: 20px;
}
.card h3 { font-size: 18px; color: var(--navy); margin-bottom: 12px; font-weight: 700; }
.card p { color: var(--gray); font-size: 14.5px; }

/* ---------- 数据条 ---------- */
.stats { background: var(--navy); color: var(--white); padding: 62px 0; }
.stats .grid-4 { gap: 20px; }
.stat { text-align: center; padding: 10px; }
.stat-num {
  font-size: 42px;
  font-weight: 700;
  color: var(--amber);
  line-height: 1.2;
}
.stat-num small { font-size: 20px; margin-left: 2px; }
.stat-label { color: #A8C0D6; font-size: 14.5px; margin-top: 8px; }

/* ---------- 流程步骤 ---------- */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 26px; position: relative; }
.step { position: relative; padding-top: 8px; }
.step-no {
  width: 46px; height: 46px;
  background: var(--navy);
  color: var(--white);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 17px; font-weight: 700;
  margin-bottom: 20px;
  position: relative;
  z-index: 2;
}
.step::before {
  content: '';
  position: absolute;
  top: 23px; left: 58px; right: -26px;
  height: 1px;
  background: var(--line);
}
.step:last-child::before { display: none; }
.step h4 { font-size: 17px; color: var(--navy); margin-bottom: 10px; font-weight: 700; }
.step p { color: var(--gray); font-size: 14px; }

/* ---------- 优势 / 关于 ---------- */
.about-wrap { display: grid; grid-template-columns: 1.05fr 1fr; gap: 60px; align-items: center; }
.about-visual {
  background: linear-gradient(140deg, var(--navy) 0%, #164C79 100%);
  border-radius: var(--radius);
  padding: 44px 36px;
  color: var(--white);
  position: relative;
  overflow: hidden;
}
.about-visual::after {
  content: 'SYA';
  position: absolute;
  right: 18px; bottom: -10px;
  font-size: 84px;
  font-weight: 700;
  color: rgba(255,255,255,.06);
  letter-spacing: 4px;
}
.about-visual h3 { font-size: 24px; margin-bottom: 16px; }
.about-visual p { color: #B9CDDF; font-size: 14.5px; }
.about-visual ul { list-style: none; margin-top: 24px; }
.about-visual li {
  padding: 11px 0 11px 24px;
  border-bottom: 1px solid rgba(255,255,255,.09);
  position: relative;
  font-size: 14.5px;
  color: #DCE7F1;
}
.about-visual li:last-child { border-bottom: 0; }
.about-visual li::before {
  content: '';
  position: absolute;
  left: 0; top: 21px;
  width: 7px; height: 7px;
  background: var(--amber);
  border-radius: 50%;
}

.about-text h2 { font-size: 30px; color: var(--navy); margin-bottom: 18px; font-weight: 700; }
.about-text p { color: var(--gray); margin-bottom: 18px; }
.about-points { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 28px; }
.about-point {
  background: var(--bg-soft);
  border-radius: var(--radius);
  padding: 18px 18px 18px 44px;
  position: relative;
  font-size: 14.5px;
  color: var(--ink);
}
.about-point strong { display: block; color: var(--navy); font-size: 15px; margin-bottom: 3px; }
.about-point::before {
  content: '';
  position: absolute;
  left: 18px; top: 22px;
  width: 14px; height: 14px;
  border: 2px solid var(--steel);
  border-radius: 2px;
}

/* ---------- 行业方案 ---------- */
.sector {
  background: var(--white);
  border: 1px solid var(--line);
  border-left: 3px solid var(--amber);
  border-radius: var(--radius);
  padding: 26px 28px;
  transition: all .25s;
}
.sector:hover { box-shadow: 0 8px 24px rgba(11,46,79,.08); }
.sector h3 { font-size: 18px; color: var(--navy); margin-bottom: 8px; font-weight: 700; }
.sector .tagline { color: var(--steel); font-size: 13px; margin-bottom: 14px; letter-spacing: .5px; }
.sector ul { list-style: none; }
.sector li { color: var(--gray); font-size: 14px; padding-left: 16px; position: relative; margin-bottom: 7px; }
.sector li::before {
  content: '';
  position: absolute; left: 0; top: 10px;
  width: 5px; height: 5px;
  background: var(--steel-light);
  border-radius: 50%;
}

/* ---------- CTA ---------- */
.cta-band {
  background: linear-gradient(110deg, var(--navy-deep), var(--navy));
  color: var(--white);
  padding: 62px 0;
  text-align: center;
}
.cta-band h2 { font-size: 28px; margin-bottom: 14px; font-weight: 700; }
.cta-band p { color: #B9CDDF; margin-bottom: 30px; }

/* ---------- 页脚 ---------- */
.footer { background: var(--navy-deep); color: #8FA8BE; font-size: 14px; padding: 58px 0 0; }
.footer-cols { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1.3fr; gap: 44px; }
.footer h4 { color: var(--white); font-size: 15.5px; margin-bottom: 18px; font-weight: 600; }
.footer ul { list-style: none; }
.footer li { margin-bottom: 10px; }
.footer a { color: #8FA8BE; text-decoration: none; }
.footer a:hover { color: var(--amber); }
.footer .logo .logo-cn { color: var(--white); }
.footer .logo .logo-en { color: #7A93AB; }
.footer-contact li { display: flex; gap: 10px; align-items: flex-start; }
.footer-contact .ico { color: var(--amber); flex-shrink: 0; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.09);
  margin-top: 44px;
  padding: 22px 0;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 13px;
  color: #6E8699;
}

/* ---------- 返回顶部 ---------- */
.totop {
  position: fixed;
  right: 26px; bottom: 26px;
  width: 44px; height: 44px;
  background: var(--navy);
  color: var(--white);
  border: 0;
  border-radius: var(--radius);
  font-size: 19px;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: all .25s;
  z-index: 200;
}
.totop.show { opacity: 1; visibility: visible; }
.totop:hover { background: var(--amber); color: var(--navy-deep); }

/* ---------- 响应式 ---------- */
@media (max-width: 980px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .step::before { display: none; }
  .about-wrap { grid-template-columns: 1fr; gap: 36px; }
  .footer-cols { grid-template-columns: 1fr 1fr; gap: 32px; }
  .hero h1 { font-size: 31px; }
  .section { padding: 64px 0; }
}

@media (max-width: 720px) {
  .nav {
    display: none;
    position: absolute;
    top: 76px; left: 0; right: 0;
    background: var(--white);
    border-bottom: 1px solid var(--line);
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 10px 24px 18px;
    box-shadow: 0 12px 26px rgba(11,46,79,.1);
  }
  .nav.open { display: flex; }
  .nav a { padding: 12px 0; width: 100%; border-bottom: 1px solid var(--bg-soft); }
  .nav .nav-cta { border-bottom: 0; text-align: center; margin-top: 10px; }
  .nav-toggle { display: block; }
  .grid-4, .grid-2, .steps { grid-template-columns: 1fr; }
  .about-points { grid-template-columns: 1fr; }
  .footer-cols { grid-template-columns: 1fr; }
  .hero { padding: 64px 0 72px; }
  .hero h1 { font-size: 25px; }
  .section-head h2 { font-size: 25px; }
  .topbar .container { flex-direction: column; gap: 3px; text-align: center; }
  .stat-num { font-size: 33px; }
}