/* OfficailStyle14 · 链脉 Nexus Pulse — bi-an 落地页语汇，自包含 CSS */

:root {
  --bg: #f8fafc;
  --bg-soft: #ffffff;
  --ink: #0f172a;
  --muted: #64748b;
  --line: #e2e8f0;
  --primary: #f0b90b;
  --primary-deep: #d9a40a;
  --secondary: #fcd535;
  --dark: #0b1220;
  --ok: #16a34a;
  --info: #2563eb;
  --violet: #7c3aed;
  --max: 1120px;
  --header-h: 72px;
  --radius: 16px;
  --radius-lg: 24px;
  --shadow: 0 18px 50px rgba(15, 23, 42, 0.12);
  --font: "Segoe UI", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 12px);
}

body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
h1, h2, h3, h4, p { margin: 0; }
ul { margin: 0; padding: 0; list-style: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }

.skip-link {
  position: absolute;
  left: -999px;
  top: 8px;
  z-index: 100;
  background: var(--dark);
  color: #fff;
  padding: 10px 14px;
  border-radius: 10px;
}
.skip-link:focus { left: 12px; }

.container {
  width: min(100% - 2rem, var(--max));
  margin-inline: auto;
}

/* Header */
.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 50;
  height: var(--header-h);
  display: flex;
  align-items: center;
  transition: background .25s ease, box-shadow .25s ease, backdrop-filter .25s ease;
}
.site-header.is-solid {
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.08);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  width: min(100% - 2rem, var(--max));
  margin-inline: auto;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: .7rem;
  font-weight: 700;
}
.brand img { height: 32px; width: auto; }
.brand small {
  display: block;
  font-size: 11px;
  font-weight: 500;
  color: var(--muted);
  letter-spacing: .04em;
}
.nav-links {
  display: none;
  align-items: center;
  gap: 1.5rem;
}
.nav-links a {
  font-weight: 500;
  color: var(--ink);
  transition: color .2s ease;
}
.nav-links a:hover { color: var(--primary-deep); }
.nav-actions {
  display: none;
  align-items: center;
  gap: .75rem;
}
.menu-btn {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: #fff;
  display: grid;
  place-items: center;
}
.menu-btn span,
.menu-btn span::before,
.menu-btn span::after {
  display: block;
  width: 16px;
  height: 2px;
  background: var(--ink);
  position: relative;
  border-radius: 2px;
}
.menu-btn span::before,
.menu-btn span::after {
  content: "";
  position: absolute;
  left: 0;
}
.menu-btn span::before { top: -5px; }
.menu-btn span::after { top: 5px; }
.mobile-menu {
  display: none;
  position: absolute;
  left: 0;
  right: 0;
  top: 100%;
  background: #fff;
  border-bottom: 1px solid var(--line);
  padding: 1rem 1.25rem 1.25rem;
  box-shadow: 0 16px 30px rgba(15, 23, 42, 0.08);
}
.mobile-menu.is-open { display: block; }
.mobile-menu a {
  display: block;
  padding: .7rem 0;
  font-weight: 500;
  border-bottom: 1px solid #f1f5f9;
}
.mobile-menu .btn { margin-top: .8rem; text-align: center; }

@media (min-width: 900px) {
  .nav-links, .nav-actions { display: flex; }
  .menu-btn, .mobile-menu { display: none !important; }
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .4rem;
  min-height: 44px;
  padding: .7rem 1.15rem;
  border-radius: 12px;
  font-weight: 650;
  border: 1px solid transparent;
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease, border-color .2s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary {
  background: var(--primary);
  color: var(--dark);
  box-shadow: 0 12px 28px rgba(240, 185, 11, 0.28);
}
.btn-primary:hover { background: var(--primary-deep); }
.btn-outline {
  background: #fff;
  border-color: #cbd5e1;
  color: var(--ink);
}
.btn-outline:hover { border-color: var(--primary); color: var(--primary-deep); }
.btn-dark {
  background: var(--dark);
  color: #fff;
}
.btn-ghost-light {
  background: transparent;
  border-color: rgba(255, 255, 255, 0.35);
  color: #fff;
}
.btn-light {
  background: #fff;
  color: var(--primary-deep);
}

/* Hero — image on LEFT (refs put image on right) */
.hero {
  position: relative;
  padding: calc(var(--header-h) + 3rem) 0 3.5rem;
  overflow: hidden;
}
.hero-glow {
  position: absolute;
  border-radius: 999px;
  filter: blur(60px);
  pointer-events: none;
  z-index: 0;
}
.hero-glow-a {
  width: 280px;
  height: 280px;
  background: rgba(240, 185, 11, 0.18);
  top: 4rem;
  left: -4rem;
}
.hero-glow-b {
  width: 360px;
  height: 360px;
  background: rgba(252, 213, 53, 0.16);
  right: -6rem;
  bottom: 0;
}
.hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 2rem;
  align-items: center;
}
@media (min-width: 960px) {
  .hero-grid {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 3rem;
  }
}
.hero-media {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
  background: #fff;
}
.hero-media img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  padding: .35rem .7rem;
  border-radius: 999px;
  background: rgba(240, 185, 11, 0.14);
  color: #8a6a00;
  font-size: .82rem;
  font-weight: 650;
  margin-bottom: 1rem;
}
.hero h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1.15;
  font-weight: 800;
  letter-spacing: -0.02em;
}
.hero h1 em {
  font-style: normal;
  background: linear-gradient(90deg, var(--primary), #f59e0b);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-lead {
  margin-top: 1rem;
  color: var(--muted);
  font-size: 1.05rem;
  max-width: 36rem;
}
.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin-top: 1.5rem;
}
.trust-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
  margin-top: 1.6rem;
}
.avatars {
  display: flex;
  align-items: center;
}
.avatars img,
.avatars .more {
  width: 36px;
  height: 36px;
  border-radius: 999px;
  border: 2px solid #fff;
  object-fit: cover;
  margin-left: -8px;
}
.avatars img:first-child,
.avatars .more:first-child { margin-left: 0; }
.avatars .more {
  display: grid;
  place-items: center;
  background: #e2e8f0;
  font-size: 11px;
  font-weight: 700;
  color: var(--ink);
}
.trust-copy { color: var(--muted); font-size: .9rem; }
.trust-copy strong { color: var(--ink); }

/* Stats strip */
.stats {
  margin-top: -1.5rem;
  position: relative;
  z-index: 2;
  padding-bottom: 1rem;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: .75rem;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.06);
  padding: 1rem;
}
@media (min-width: 800px) {
  .stats-grid { grid-template-columns: repeat(4, 1fr); padding: 1.25rem 1.5rem; }
}
.stat {
  text-align: center;
  padding: .6rem .4rem;
}
.stat strong {
  display: block;
  font-size: 1.35rem;
  font-weight: 800;
}
.stat span {
  color: var(--muted);
  font-size: .85rem;
}

/* Sections */
.section { padding: 4rem 0; }
.section-muted { background: linear-gradient(180deg, #fff, #f8fafc); }
.section-head {
  max-width: 40rem;
  margin-bottom: 2rem;
}
.section-head.center {
  text-align: center;
  margin-inline: auto;
}
.section-head h2 {
  font-size: clamp(1.7rem, 3vw, 2.35rem);
  font-weight: 800;
  letter-spacing: -0.02em;
}
.section-head p {
  margin-top: .7rem;
  color: var(--muted);
  font-size: 1.02rem;
}

/* 2×2 capability cards (refs use icon list) */
.card-grid {
  display: grid;
  gap: 1rem;
}
@media (min-width: 720px) {
  .card-grid { grid-template-columns: repeat(2, 1fr); gap: 1.1rem; }
}
.cap-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.2rem 1.25rem;
  transition: transform .2s ease, box-shadow .2s ease;
}
.cap-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 28px rgba(15, 23, 42, 0.08);
}
.cap-icon {
  width: 42px;
  height: 42px;
  border-radius: 999px;
  display: grid;
  place-items: center;
  font-weight: 800;
  margin-bottom: .85rem;
}
.cap-icon.a { background: rgba(240, 185, 11, 0.15); color: #a07800; }
.cap-icon.b { background: rgba(245, 158, 11, 0.14); color: #b45309; }
.cap-icon.c { background: rgba(22, 163, 74, 0.12); color: var(--ok); }
.cap-icon.d { background: rgba(124, 58, 237, 0.12); color: var(--violet); }
.cap-card h3 { font-size: 1.1rem; font-weight: 750; margin-bottom: .35rem; }
.cap-card p { color: var(--muted); font-size: .95rem; }

/* Split blocks */
.split {
  display: grid;
  gap: 2rem;
  align-items: center;
}
@media (min-width: 960px) {
  .split { grid-template-columns: 1fr 1fr; gap: 3rem; }
  .split.reverse > :first-child { order: 2; }
}
.split-media {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
  background: #fff;
}
.split-media img {
  width: 100%;
  aspect-ratio: 16 / 11;
  object-fit: cover;
  transition: transform .7s ease;
}
.split-media:hover img { transform: scale(1.04); }
.point-list {
  display: grid;
  gap: 1rem;
  margin: 1.25rem 0 1.5rem;
}
.point {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: .85rem;
  align-items: start;
}
.point-mark {
  width: 44px;
  height: 44px;
  border-radius: 999px;
  display: grid;
  place-items: center;
  font-weight: 800;
  font-size: .85rem;
}
.point-mark.a { background: rgba(240, 185, 11, 0.15); color: #a07800; }
.point-mark.b { background: rgba(37, 99, 235, 0.12); color: var(--info); }
.point-mark.c { background: rgba(22, 163, 74, 0.12); color: var(--ok); }
.point-mark.d { background: rgba(124, 58, 237, 0.12); color: var(--violet); }
.point h3 { font-size: 1.05rem; font-weight: 750; margin-bottom: .2rem; }
.point p { color: var(--muted); font-size: .94rem; }

/* Pill board */
.pill-board {
  display: grid;
  gap: .75rem;
}
@media (min-width: 720px) {
  .pill-board { grid-template-columns: repeat(2, 1fr); }
}
.pill {
  display: flex;
  gap: .85rem;
  align-items: flex-start;
  padding: 1rem 1.1rem;
  border-radius: 14px;
  background: #fff;
  border: 1px solid var(--line);
}
.pill b { display: block; margin-bottom: .2rem; }
.pill span { color: var(--muted); font-size: .92rem; }

/* FAQ */
.faq {
  display: grid;
  gap: .75rem;
  max-width: 760px;
  margin-inline: auto;
}
.faq-item {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 14px;
  overflow: hidden;
}
.faq-trigger {
  width: 100%;
  text-align: left;
  padding: 1rem 1.1rem;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  font-weight: 700;
}
.faq-icon { color: var(--muted); font-weight: 400; }
.faq-body {
  display: none;
  padding: 0 1.1rem 1.05rem;
  color: var(--muted);
}
.faq-item.is-open .faq-body { display: block; }

/* CTA band */
.cta-band {
  padding: 4rem 0;
  background: linear-gradient(120deg, var(--primary), #f59e0b 55%, var(--secondary));
  color: var(--dark);
}
.cta-inner {
  text-align: center;
  max-width: 44rem;
  margin-inline: auto;
}
.cta-inner h2 {
  font-size: clamp(1.7rem, 3vw, 2.35rem);
  font-weight: 800;
}
.cta-inner p {
  margin: .9rem auto 1.4rem;
  max-width: 34rem;
  color: rgba(11, 18, 32, 0.78);
}
.cta-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: .75rem;
}

/* Footer */
.site-footer {
  background: var(--dark);
  color: #cbd5e1;
  padding: 3rem 0 1.5rem;
}
.footer-grid {
  display: grid;
  gap: 1.75rem 1.25rem;
  margin-bottom: 2rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}
@media (min-width: 720px) {
  .footer-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}
@media (min-width: 1100px) {
  .footer-grid { grid-template-columns: repeat(6, minmax(0, 1fr)); gap: 1.5rem; }
}
.site-footer h4 {
  color: #fff;
  font-size: .95rem;
  margin-bottom: 1rem;
}
.site-footer a {
  display: block;
  color: #94a3b8;
  font-size: .875rem;
  padding: .3rem 0;
}
.site-footer a:hover { color: var(--primary); }
.footer-bottom {
  border-top: 1px solid #1e293b;
  padding-top: 1.25rem;
  color: #64748b;
  font-size: .85rem;
}

/* Header language dropdown — hover on desktop, click on mobile */
.lang-dropdown { position: relative; }
.lang-trigger {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  min-height: 40px;
  padding: .35rem .2rem;
  font-weight: 600;
  color: var(--ink);
  transition: color .2s ease;
}
.lang-trigger:hover { color: var(--primary-deep); }
.lang-caret { transition: transform .2s ease; }
.lang-dropdown.is-open .lang-caret,
.lang-dropdown:hover .lang-caret { transform: rotate(180deg); }
.lang-menu {
  position: absolute;
  right: 0;
  top: calc(100% + 8px);
  min-width: 140px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: 0 14px 30px rgba(15, 23, 42, 0.12);
  padding: .35rem;
  z-index: 60;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateY(-6px) scale(0.98);
  transform-origin: top right;
  transition: opacity .2s ease, transform .2s ease, visibility .2s ease;
}
.lang-dropdown.is-open .lang-menu,
.lang-dropdown:focus-within .lang-menu {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: none;
}
@media (hover: hover) and (pointer: fine) {
  .lang-dropdown:not(.mobile-lang):hover .lang-menu {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: none;
  }
}
.lang-option {
  display: block;
  width: 100%;
  text-align: left;
  padding: .65rem .8rem;
  border-radius: 8px;
  font-weight: 500;
  color: var(--ink);
}
.lang-option:hover,
.lang-option.is-active {
  background: #f8fafc;
  color: var(--primary-deep);
}
.mobile-lang {
  padding: .55rem 0;
  border-bottom: 1px solid #f1f5f9;
}
.mobile-lang-trigger {
  width: 100%;
  justify-content: space-between;
  min-height: 44px;
  font-weight: 500;
}
.mobile-lang-menu {
  position: static;
  margin-top: .45rem;
  box-shadow: none;
  border-color: #e2e8f0;
  transform: none;
}
.mobile-lang:not(.is-open) .mobile-lang-menu {
  display: none;
}
.mobile-lang.is-open .mobile-lang-menu {
  display: block;
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

/* Motion */
.fade-up {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity .55s ease, transform .55s ease;
}
.fade-up.is-visible {
  opacity: 1;
  transform: none;
}
.delay-1 { transition-delay: .08s; }
.delay-2 { transition-delay: .16s; }

@media (prefers-reduced-motion: reduce) {
  .fade-up { opacity: 1; transform: none; transition: none; }
  .btn:hover, .cap-card:hover { transform: none; }
  .split-media:hover img { transform: none; }
}


/* Site generation layout variants */
@media (min-width: 960px) {
  .hero-grid.is-flip { grid-template-columns: 0.95fr 1.05fr; }
  .hero-grid.is-flip .hero-copy { order: 1; }
  .hero-grid.is-flip .hero-media { order: 2; }
}
.hero-grid.is-stack {
  grid-template-columns: 1fr;
  max-width: 820px;
  margin-inline: auto;
}
@media (min-width: 900px) {
  .card-grid.is-three { grid-template-columns: repeat(3, 1fr); }
}
@media (min-width: 900px) and (max-width: 1099px) {
  .card-grid.is-three { grid-template-columns: repeat(2, 1fr); }
}