/* ===========================================================
   中天序列 ZENSEQ · 企业官网样式
   =========================================================== */

:root {
  --brand: #2563EB;
  --brand-2: #06B6D4;
  --brand-grad: linear-gradient(135deg, #2563EB 0%, #0EA5E9 55%, #06B6D4 100%);
  --ink: #0F172A;
  --ink-2: #334155;
  --muted: #64748B;
  --line: #E2E8F0;
  --soft: #F8FAFC;
  --white: #FFFFFF;

  --radius: 16px;
  --radius-lg: 22px;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, .05);
  --shadow: 0 10px 30px rgba(15, 23, 42, .08);
  --shadow-lg: 0 24px 60px rgba(15, 23, 42, .12);

  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
          "Microsoft YaHei", "Source Han Sans SC", "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink-2);
  background: var(--white);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 { color: var(--ink); margin: 0; line-height: 1.35; letter-spacing: -.01em; }
p { margin: 0; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }

.container {
  width: 100%;
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 24px;
}

section[id] { scroll-margin-top: 84px; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 48px;
  padding: 0 26px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease, color .18s ease;
}
.btn-sm { height: 38px; padding: 0 18px; font-size: 14px; }

.btn-primary {
  background: var(--brand-grad);
  color: #fff;
  box-shadow: 0 8px 20px rgba(37, 99, 235, .28);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 14px 30px rgba(37, 99, 235, .34); }

.btn-ghost {
  background: var(--white);
  color: var(--ink);
  border-color: var(--line);
}
.btn-ghost:hover { transform: translateY(-2px); border-color: #cbd5e1; box-shadow: var(--shadow-sm); }

/* ---------- 顶部导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(255, 255, 255, .82);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color .2s ease, box-shadow .2s ease;
}
.site-header.is-scrolled {
  border-bottom-color: var(--line);
  box-shadow: 0 4px 18px rgba(15, 23, 42, .05);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.brand img { height: 44px; width: auto; }

.nav { display: flex; align-items: center; gap: 30px; }
.nav > a {
  position: relative;
  font-size: 15px;
  font-weight: 500;
  color: var(--ink-2);
  transition: color .18s ease;
}
.nav > a:not(.btn):hover { color: var(--brand); }
.nav > a.is-active { color: var(--brand); }
.nav > a.is-active::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -7px;
  height: 2px; border-radius: 2px;
  background: var(--brand-grad);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 42px; height: 42px;
  padding: 0;
  background: none; border: 0; cursor: pointer;
}
.nav-toggle span {
  display: block; height: 2px; width: 22px;
  margin: 0 auto;
  background: var(--ink);
  border-radius: 2px;
  transition: transform .22s ease, opacity .22s ease;
}
.nav-toggle.is-active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.is-active span:nth-child(2) { opacity: 0; }
.nav-toggle.is-active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding: 92px 0 96px;
  overflow: hidden;
}
.hero-glow {
  position: absolute;
  inset: -20% -10% auto -10%;
  height: 780px;
  background:
    radial-gradient(46% 44% at 22% 26%, rgba(37, 99, 235, .16), transparent 70%),
    radial-gradient(40% 40% at 76% 18%, rgba(6, 182, 212, .16), transparent 70%);
  filter: blur(4px);
  pointer-events: none;
}
.hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: 1.02fr .98fr;
  gap: 56px;
  align-items: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, .7);
  font-size: 13px;
  font-weight: 500;
  color: var(--muted);
}
.eyebrow .dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--brand-grad);
  box-shadow: 0 0 0 4px rgba(37, 99, 235, .14);
}

.hero h1 {
  margin: 22px 0 18px;
  font-size: 52px;
  font-weight: 800;
  letter-spacing: -.02em;
}
.grad {
  background: var(--brand-grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.lead { font-size: 17px; color: var(--muted); max-width: 32em; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin: 32px 0 40px; }

.hero-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 36px;
  margin: 0; padding: 22px 0 0;
  list-style: none;
  border-top: 1px solid var(--line);
}
.hero-facts li { display: flex; flex-direction: column; }
.hero-facts strong { font-size: 17px; color: var(--ink); font-weight: 700; }
.hero-facts span { font-size: 13px; color: var(--muted); }

/* Hero 可视化 */
.hero-visual { position: relative; }
.panel {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}
.panel-bar {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 14px 18px;
  border-bottom: 1px solid var(--line);
  background: var(--soft);
}
.panel-bar .tl { width: 10px; height: 10px; border-radius: 50%; background: #CBD5E1; }
.panel-bar .tl:nth-child(1) { background: #F87171; }
.panel-bar .tl:nth-child(2) { background: #FBBF24; }
.panel-bar .tl:nth-child(3) { background: #34D399; }
.panel-bar em {
  margin-left: 10px;
  font-style: normal;
  font-size: 12px;
  color: var(--muted);
  letter-spacing: .3px;
}
.panel-body { padding: 20px 22px 18px; }

.seq-row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 11px 0;
  border-bottom: 1px dashed var(--line);
}
.seq-row:last-of-type { border-bottom: 0; }
.seq-row .node {
  order: 1; flex: 0 0 auto;
  width: 13px; height: 13px; border-radius: 50%;
  background: var(--brand-grad);
  box-shadow: 0 0 0 4px rgba(37, 99, 235, .12);
}
.seq-row .node.n2 { background: linear-gradient(135deg, #0EA5E9, #06B6D4); box-shadow: 0 0 0 4px rgba(6, 182, 212, .14); }
.seq-row .node.n3 { background: linear-gradient(135deg, #4F46E5, #2563EB); box-shadow: 0 0 0 4px rgba(79, 70, 229, .14); }
.seq-row .node.n4 { background: linear-gradient(135deg, #06B6D4, #22D3EE); box-shadow: 0 0 0 4px rgba(34, 211, 238, .16); }
.seq-row b {
  order: 2; flex: 0 0 auto;
  font-size: 13.5px; font-weight: 600; color: var(--ink);
}
.seq-row .bar {
  order: 3; flex: 1;
  height: 8px; border-radius: 999px;
  background: linear-gradient(90deg, rgba(37, 99, 235, .18), rgba(6, 182, 212, .28));
}
.seq-row .bar.wide { flex: 2.1; }

.panel-foot { display: flex; gap: 8px; padding-top: 16px; }
.chip {
  padding: 5px 12px;
  border-radius: 999px;
  background: var(--soft);
  border: 1px solid var(--line);
  font-size: 12px;
  color: var(--muted);
}

.float-card {
  position: absolute;
  display: flex; flex-direction: column;
  padding: 12px 16px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 14px;
  box-shadow: var(--shadow);
}
.float-card b { font-size: 14px; color: var(--ink); }
.float-card span { font-size: 12px; color: var(--muted); }
.fc-1 { top: 34px; right: -34px; }
.fc-2 { bottom: 46px; left: -46px; }

/* ---------- 区块通用 ---------- */
.section { padding: 92px 0; }
.section-soft { background: var(--soft); border-block: 1px solid var(--line); }

.section-head { max-width: 720px; margin: 0 auto 52px; text-align: center; }
.kicker {
  display: inline-block;
  margin-bottom: 14px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .16em;
  text-transform: uppercase;
  background: var(--brand-grad);
  -webkit-background-clip: text; background-clip: text;
  color: transparent;
}
.section-head h2 { font-size: 34px; font-weight: 800; }
.section-head p { margin-top: 14px; font-size: 16px; color: var(--muted); }

.grid { display: grid; gap: 22px; }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }

/* ---------- 卡片 ---------- */
.card {
  padding: 30px 26px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  transition: transform .22s ease, box-shadow .22s ease, border-color .22s ease;
}
.card:hover {
  transform: translateY(-5px);
  border-color: #cbd5e1;
  box-shadow: var(--shadow);
}
.card h3 { margin-bottom: 10px; font-size: 18px; font-weight: 700; }
.card p { font-size: 14.5px; color: var(--muted); }

.card-icon {
  display: flex; align-items: center; justify-content: center;
  width: 48px; height: 48px;
  margin-bottom: 18px;
  border-radius: 13px;
  color: #fff;
}
.card-icon svg { width: 24px; height: 24px; }
.i-blue   { background: linear-gradient(135deg, #2563EB, #0EA5E9); }
.i-cyan   { background: linear-gradient(135deg, #0EA5E9, #06B6D4); }
.i-indigo { background: linear-gradient(135deg, #4F46E5, #2563EB); }
.i-teal   { background: linear-gradient(135deg, #06B6D4, #22D3EE); }

.card-flat { background: var(--white); }
.card-flat .num {
  display: block;
  margin-bottom: 14px;
  font-size: 26px; font-weight: 800;
  background: var(--brand-grad);
  -webkit-background-clip: text; background-clip: text;
  color: transparent;
}

/* ---------- 双栏 ---------- */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}
.split-reverse .split-copy { order: 2; }
.split-reverse .split-visual { order: 1; }
.split h2 { font-size: 30px; font-weight: 800; margin: 12px 0 16px; }
.lead-sm { font-size: 15.5px; color: var(--muted); margin-bottom: 16px; }

/* 关于我们（单栏） */
.about-single { max-width: 820px; margin: 0 auto; }
.about-single h2 { font-size: 30px; font-weight: 800; margin: 12px 0 18px; }

.check-list { margin: 22px 0 28px; padding: 0; list-style: none; }
.check-list li {
  position: relative;
  padding-left: 30px;
  margin-bottom: 12px;
  font-size: 15px;
  color: var(--ink-2);
}
.check-list li::before {
  content: "";
  position: absolute; left: 0; top: 7px;
  width: 18px; height: 18px;
  border-radius: 50%;
  background: var(--brand-grad);
}
.check-list li::after {
  content: "";
  position: absolute; left: 6px; top: 12px;
  width: 5px; height: 9px;
  border: solid #fff;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

/* 手机 mock */
.split-visual { display: flex; justify-content: center; }
.phone {
  width: 258px;
  padding: 11px;
  border-radius: 36px;
  background: linear-gradient(160deg, #1E293B, #0F172A);
  box-shadow: var(--shadow-lg);
}
.phone-screen {
  display: flex; flex-direction: column; gap: 10px;
  min-height: 412px;
  padding: 15px 14px;
  background: var(--white);
  border-radius: 27px;
}
.ph-head {
  display: flex; align-items: center; gap: 9px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}
.ph-head b { font-size: 15px; color: var(--ink); }
.ph-logo { width: 24px; height: 24px; border-radius: 8px; background: var(--brand-grad); }

.ph-bubble {
  max-width: 80%;
  padding: 9px 12px;
  border-radius: 15px;
  font-size: 12.5px;
  line-height: 1.55;
}
.ph-bubble.left { align-self: flex-start; background: #F1F5F9; color: var(--ink-2); border-bottom-left-radius: 5px; }
.ph-bubble.right { align-self: flex-end; background: var(--brand-grad); color: #fff; border-bottom-right-radius: 5px; }
.ph-line { display: block; height: 7px; margin: 6px 0; border-radius: 4px; background: rgba(255, 255, 255, .48); }
.ph-line.short { width: 58%; }

.ph-input {
  display: flex; align-items: center; justify-content: space-between;
  margin-top: auto;
  padding: 9px 12px;
  border: 1px solid var(--line);
  border-radius: 22px;
  font-size: 12px;
  color: #94A3B8;
}
.ph-input i { width: 26px; height: 26px; border-radius: 50%; background: var(--brand-grad); }

/* 公司信息卡 */
.info-card {
  width: 100%;
  padding: 30px 28px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}
.info-card h3 { margin-bottom: 18px; font-size: 18px; }
.info-list { margin: 0; }
.info-list > div {
  display: grid;
  grid-template-columns: 118px 1fr;
  gap: 14px;
  padding: 13px 0;
  border-bottom: 1px dashed var(--line);
}
.info-list > div:last-child { border-bottom: 0; }
.info-list dt { font-size: 13.5px; color: var(--muted); }
.info-list dd { margin: 0; font-size: 14px; color: var(--ink); font-weight: 600; }

/* ---------- 联系 ---------- */
.contact-card {
  display: block;
  padding: 32px 28px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  transition: transform .22s ease, box-shadow .22s ease, border-color .22s ease;
}
a.contact-card:hover {
  transform: translateY(-5px);
  border-color: #cbd5e1;
  box-shadow: var(--shadow);
}
.contact-card h3 { font-size: 16px; margin-bottom: 8px; }
.contact-main { font-size: 16px; font-weight: 700; color: var(--ink); word-break: break-word; }
.contact-addr { font-size: 14.5px; font-weight: 600; line-height: 1.65; }
.contact-note { display: block; margin-top: 6px; font-size: 13px; color: var(--muted); }

/* ---------- 页脚 ---------- */
.site-footer {
  padding: 56px 0 26px;
  background: #0B1220;
  color: #94A3B8;
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 32px;
  align-items: flex-start;
  justify-content: space-between;
  padding-bottom: 28px;
  border-bottom: 1px solid rgba(148, 163, 184, .18);
}
.footer-brand img { height: 46px; width: auto; }
.footer-brand p { margin-top: 14px; font-size: 14px; }
.footer-links { display: flex; flex-wrap: wrap; gap: 26px; }
.footer-links a { font-size: 14.5px; transition: color .18s ease; }
.footer-links a:hover { color: #fff; }

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: space-between;
  padding-top: 22px;
  font-size: 13px;
}
.footer-bottom .filing { color: #64748B; }

/* ---------- 入场动画 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity .6s cubic-bezier(.22, .61, .36, 1), transform .6s cubic-bezier(.22, .61, .36, 1);
}
.reveal.is-visible { opacity: 1; transform: none; }

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .hero h1 { font-size: 42px; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .fc-1 { right: -12px; }
  .fc-2 { left: -12px; }
}

@media (max-width: 900px) {
  .nav-toggle { display: flex; }
  .nav {
    position: fixed;
    top: 72px; left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    padding: 16px 24px 24px;
    background: var(--white);
    border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow);
    opacity: 0;
    transform: translateY(-10px);
    pointer-events: none;
    transition: opacity .2s ease, transform .2s ease;
  }
  .nav.is-open { opacity: 1; transform: none; pointer-events: auto; }
  .nav > a { padding: 11px 0; font-size: 16px; }
  .nav > a.is-active::after { display: none; }
  .nav > a.btn { margin-top: 8px; align-self: flex-start; }

  .hero { padding: 64px 0 72px; }
  .hero-inner { grid-template-columns: 1fr; gap: 48px; }
  .hero-visual { order: 2; }
  .float-card { display: none; }

  .split { grid-template-columns: 1fr; gap: 40px; }
  .split-reverse .split-copy { order: 1; }
  .split-reverse .split-visual { order: 2; }

  .section { padding: 68px 0; }
  .section-head h2 { font-size: 28px; }
  .grid-3 { grid-template-columns: 1fr; }
}

@media (max-width: 600px) {
  .container { padding: 0 18px; }
  .hero h1 { font-size: 33px; }
  .hero-facts { gap: 24px; }
  .grid-4 { grid-template-columns: 1fr; }
  .section-head h2 { font-size: 24px; }
  .split h2 { font-size: 24px; }
  .about-single h2 { font-size: 24px; }
  .info-list > div { grid-template-columns: 1fr; gap: 4px; }
  .footer-bottom { flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .card:hover, a.contact-card:hover, .btn:hover { transform: none; }
}