/* ============================================================
   Linkworlds — 科技感企业形象站样式
   Theme: 深色 + 青蓝渐变 + 玻璃拟态
   ============================================================ */

:root {
  --bg: #070b14;
  --bg-2: #0b1220;
  --surface: rgba(255, 255, 255, 0.04);
  --surface-2: rgba(255, 255, 255, 0.06);
  --border: rgba(120, 160, 220, 0.16);
  --text: #e8eef7;
  --text-dim: #9fb0c7;
  --text-mut: #6b7c95;
  --cyan: #22d3ee;
  --blue: #3b82f6;
  --accent-grad: linear-gradient(120deg, #22d3ee 0%, #3b82f6 100%);
  --radius: 16px;
  --maxw: 1180px;
  --header-h: 72px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

* { box-sizing: border-box; }
html, body { overflow-x: hidden; }

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

body {
  margin: 0;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
h1, h2, h3 { line-height: 1.2; margin: 0 0 .4em; font-weight: 700; letter-spacing: .01em; }

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

/* ===== Background layers ===== */
.bg-grid {
  position: fixed; inset: 0; z-index: -2;
  background:
    linear-gradient(var(--bg), var(--bg-2)),
    repeating-linear-gradient(0deg, transparent 0 39px, rgba(80,120,180,.05) 39px 40px),
    repeating-linear-gradient(90deg, transparent 0 39px, rgba(80,120,180,.05) 39px 40px);
  background-blend-mode: normal;
}
.bg-glow {
  position: fixed; inset: 0; z-index: -1; pointer-events: none;
  background:
    radial-gradient(700px 500px at 78% -5%, rgba(34, 211, 238, .16), transparent 60%),
    radial-gradient(640px 460px at 8% 12%, rgba(59, 130, 246, .16), transparent 60%),
    radial-gradient(900px 600px at 50% 120%, rgba(59, 130, 246, .10), transparent 60%);
}

/* ===== Header ===== */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; height: var(--header-h);
  z-index: 100; display: flex; align-items: center;
  backdrop-filter: blur(12px);
  background: rgba(7, 11, 20, .55);
  border-bottom: 1px solid transparent;
  transition: background .3s var(--ease), border-color .3s var(--ease);
}
.site-header.scrolled { background: rgba(7, 11, 20, .82); border-bottom-color: var(--border); }
.nav-inner { display: flex; align-items: center; justify-content: space-between; gap: 16px; }

.brand { display: flex; align-items: center; gap: 10px; }
.brand-mark { display: grid; place-items: center; filter: drop-shadow(0 0 9px rgba(59,130,246,.32)); transition: filter .3s var(--ease); }
.brand:hover .brand-mark { filter: drop-shadow(0 0 13px rgba(251,191,36,.42)); }
.brand-text { display: flex; flex-direction: column; line-height: 1.05; }
.brand-text strong { font-size: 18px; letter-spacing: .02em; }
.brand-text em { font-style: normal; font-size: 11px; color: var(--text-mut); letter-spacing: .14em; }

.nav-links { display: flex; gap: 28px; }
.nav-links a {
  position: relative; font-size: 15px; color: var(--text-dim);
  padding: 6px 0; transition: color .2s var(--ease);
}
.nav-links a::after {
  content: ""; position: absolute; left: 0; bottom: 0; height: 2px; width: 0;
  background: var(--accent-grad); transition: width .25s var(--ease);
}
.nav-links a:hover, .nav-links a.active { color: var(--text); }
.nav-links a.active::after, .nav-links a:hover::after { width: 100%; }

.nav-actions { display: flex; align-items: center; gap: 12px; }
.lang-switch {
  display: inline-flex; align-items: center; gap: 2px; cursor: pointer;
  border: 1px solid var(--border); background: var(--surface);
  color: var(--text-dim); border-radius: 999px; padding: 6px 14px;
  font-size: 13px; transition: all .2s var(--ease);
}
.lang-switch:hover { color: var(--text); border-color: rgba(34,211,238,.5); }
.lang-switch .lang-en { color: var(--text-mut); }
body[data-lang="en"] .lang-switch .lang-en { color: var(--cyan); }
body[data-lang="zh"] .lang-switch .lang-zh { color: var(--cyan); }

.nav-toggle { display: none; flex-direction: column; gap: 5px; width: 40px; height: 40px;
  justify-content: center; align-items: center; background: transparent; border: 0; cursor: pointer; }
.nav-toggle span { width: 22px; height: 2px; background: var(--text); border-radius: 2px; transition: .3s var(--ease); }
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ===== Hero / Banner Slider ===== */
.hero { position: relative; min-height: 100dvh; overflow: hidden; }
.hero-slides { position: relative; min-height: 100dvh; }

.hero-slide {
  position: absolute; inset: 0; display: flex; align-items: center;
  padding: calc(var(--header-h) + 30px) 0 132px;
  opacity: 0; visibility: hidden; transform: translateY(24px);
  transition: opacity .7s var(--ease), transform .7s var(--ease), visibility .7s;
}
.hero-slide.is-active { opacity: 1; visibility: visible; transform: none; }

.slide-inner { position: relative; z-index: 2; max-width: 780px; }
.slide-kicker {
  display: flex; align-items: center; gap: 12px;
  color: var(--cyan); letter-spacing: .22em; font-size: 12.5px;
  text-transform: uppercase; margin: 0 0 20px;
}
.slide-kicker::before { content: ""; width: 34px; height: 1px; background: var(--cyan); opacity: .65; }

.slide-title { font-size: clamp(38px, 7vw, 76px); font-weight: 800; line-height: 1.06; letter-spacing: .01em; margin: 0 0 20px; }
.slide-title span { display: block; }
.slide-title .accent { background: var(--accent-grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
body[data-lang="en"] .slide-title { font-size: clamp(32px, 5.2vw, 58px); }

.slide-desc { font-size: clamp(15px, 1.9vw, 18px); color: var(--text-dim); max-width: 600px; margin: 0 0 26px; line-height: 1.72; }

.slide-tags { display: flex; flex-wrap: wrap; gap: 10px; list-style: none; padding: 0; margin: 0 0 32px; }
.slide-tags li {
  font-size: 12.5px; letter-spacing: .02em; color: var(--text-dim);
  padding: 6px 15px; border-radius: 999px;
  border: 1px solid var(--border); background: rgba(255,255,255,.03);
}
.slide-cta { display: flex; gap: 14px; flex-wrap: wrap; }

.slide-visual {
  position: absolute; right: -7%; top: 50%; transform: translateY(-50%);
  width: min(46vw, 540px); z-index: 1; opacity: .5; pointer-events: none;
}
.slide-visual svg { width: 100%; height: auto; display: block; }
.hero-slide.is-active .slide-visual { animation: visualIn 1.2s var(--ease) both; }
@keyframes visualIn {
  from { opacity: 0; transform: translateY(-50%) scale(.93); }
  to   { opacity: .5; transform: translateY(-50%) scale(1); }
}

.hero-controls {
  position: absolute; left: 50%; bottom: 38px; transform: translateX(-50%);
  display: flex; align-items: center; gap: 16px; z-index: 6;
}
.hero-arrow {
  width: 40px; height: 40px; border-radius: 50%; display: grid; place-items: center;
  border: 1px solid var(--border); background: rgba(255,255,255,.04);
  color: var(--text-dim); cursor: pointer; padding: 0;
  transition: color .25s var(--ease), border-color .25s var(--ease), transform .25s var(--ease);
}
.hero-arrow:hover { color: var(--cyan); border-color: rgba(34,211,238,.55); transform: scale(1.07); }

.hero-dots { display: flex; align-items: center; gap: 9px; }
.hero-dots button {
  width: 26px; height: 3px; border-radius: 2px; border: 0; padding: 0; cursor: pointer;
  background: rgba(255,255,255,.18);
  transition: width .4s var(--ease), background .4s var(--ease), box-shadow .4s var(--ease);
}
.hero-dots button:hover { background: rgba(255,255,255,.34); }
.hero-dots button.is-active { width: 46px; background: var(--accent-grad); box-shadow: 0 0 14px rgba(34,211,238,.55); }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 13px 28px; border-radius: 999px; font-size: 15px; font-weight: 600;
  cursor: pointer; border: 1px solid transparent; transition: transform .2s var(--ease), box-shadow .2s var(--ease), background .2s var(--ease);
}
.btn-primary { background: var(--accent-grad); color: #04121f; box-shadow: 0 10px 30px rgba(34,211,238,.25); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 14px 40px rgba(34,211,238,.4); }
.btn-ghost { border-color: var(--border); color: var(--text); background: var(--surface); }
.btn-ghost:hover { border-color: rgba(34,211,238,.5); transform: translateY(-2px); }

.hero-stats { display: flex; gap: 40px; list-style: none; padding: 0; margin: 56px 0 0; flex-wrap: wrap; }
.hero-stats li { display: flex; flex-direction: column; }
.hero-stats strong { font-size: clamp(30px, 5vw, 44px); font-weight: 800;
  background: var(--accent-grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero-stats span { color: var(--text-mut); font-size: 14px; letter-spacing: .04em; }

.scroll-hint { position: absolute; right: 34px; bottom: 34px;
  width: 22px; height: 36px; border: 2px solid var(--border); border-radius: 12px; z-index: 6; }
.scroll-hint span { position: absolute; left: 50%; top: 8px; width: 4px; height: 8px; border-radius: 4px;
  background: var(--cyan); transform: translateX(-50%); animation: scrollDot 1.8s var(--ease) infinite; }
@keyframes scrollDot { 0% { opacity: 0; top: 8px; } 40% { opacity: 1; } 100% { opacity: 0; top: 24px; } }

/* ===== Sections ===== */
.section { padding: 110px 0; position: relative; }
.section-alt { background: linear-gradient(180deg, rgba(255,255,255,.015), rgba(255,255,255,0)); }
.section-head { text-align: center; max-width: 760px; margin: 0 auto 56px; }
.section-tag { display: inline-block; color: var(--cyan); letter-spacing: .24em; font-size: 12px;
  text-transform: uppercase; margin-bottom: 14px; }
.section-head h2 { font-size: clamp(28px, 4.5vw, 44px); }
.section-desc { color: var(--text-dim); font-size: 17px; margin-top: 14px; }

/* ===== Products ===== */
.products-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.product-card { overflow: hidden; padding: 0; display: flex; flex-direction: column;
  transition: transform .3s var(--ease), border-color .3s var(--ease), box-shadow .3s var(--ease); }
.product-card:hover { transform: translateY(-6px); border-color: rgba(34,211,238,.45);
  box-shadow: 0 18px 50px rgba(0,0,0,.35); }
.product-visual { height: 170px; display: grid; place-items: center; position: relative;
  background: radial-gradient(ellipse at 50% 120%, rgba(34,211,238,.12), rgba(34,211,238,0) 70%); }
.product-visual svg { width: 78%; max-height: 140px; transition: transform .4s var(--ease); }
.product-card:hover .product-visual svg { transform: scale(1.06); }
.product-visual::after { content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 1px;
  background: linear-gradient(90deg, transparent, rgba(34,211,238,.35), transparent); }
.product-body { padding: 22px 24px 26px; display: flex; flex-direction: column; flex: 1; }
.product-head { display: flex; align-items: baseline; justify-content: space-between; gap: 12px;
  margin-bottom: 12px; }
.product-card h3 { font-size: 19px; margin: 0; }
.product-en { color: var(--text-mut); font-size: 12px; letter-spacing: .06em; margin: 0; white-space: nowrap; }
.product-body > p { color: var(--text-dim); font-size: 14.5px; margin: 0; flex: 1; }
.product-body .biz-tags { margin-top: 18px; }

/* ===== About ===== */
.about-grid { display: grid; grid-template-columns: 1.4fr 1fr; gap: 40px; align-items: start; }
.about-text p { font-size: 17px; color: var(--text-dim); margin: 0 0 18px; }
.about-points { list-style: none; padding: 0; margin: 22px 0 0; display: grid; gap: 12px; }
.about-points li { position: relative; padding-left: 28px; color: var(--text); }
.about-points li::before { content: ""; position: absolute; left: 0; top: 9px; width: 12px; height: 12px;
  border-radius: 4px; background: var(--accent-grad); box-shadow: 0 0 12px rgba(34,211,238,.5); }

.glass { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  backdrop-filter: blur(10px); box-shadow: 0 10px 40px rgba(0,0,0,.25); }
.about-card { padding: 30px 32px; }
.about-card h3 { font-size: 20px; margin-bottom: 18px; }
.about-card dl { margin: 0; display: grid; grid-template-columns: auto 1fr; gap: 12px 18px; }
.about-card dt { color: var(--cyan); font-size: 13px; letter-spacing: .04em; white-space: nowrap; }
.about-card dd { margin: 0; color: var(--text-dim); font-size: 14px; }

/* ===== Business grid ===== */
.biz-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.biz-card { position: relative; padding: 30px 28px 32px; border-radius: var(--radius);
  background: var(--surface); border: 1px solid var(--border); overflow: hidden;
  transition: transform .3s var(--ease), border-color .3s var(--ease), box-shadow .3s var(--ease); }
.biz-card::before { content: ""; position: absolute; inset: 0; opacity: 0; transition: opacity .3s var(--ease);
  background: radial-gradient(420px 240px at 80% -10%, rgba(34,211,238,.16), transparent 60%); }
.biz-card:hover { transform: translateY(-6px); border-color: rgba(34,211,238,.45); box-shadow: 0 18px 50px rgba(0,0,0,.35); }
.biz-card:hover::before { opacity: 1; }
.biz-icon { width: 52px; height: 52px; border-radius: 14px; display: grid; place-items: center;
  background: rgba(34,211,238,.12); border: 1px solid rgba(34,211,238,.3); margin-bottom: 20px;
  color: var(--cyan); }
.biz-index { position: absolute; top: 22px; right: 24px; font-size: 13px; color: var(--text-mut); letter-spacing: .1em; }
.biz-card h3 { font-size: 21px; }
.biz-card .biz-en { color: var(--text-mut); font-size: 13px; letter-spacing: .06em; margin: -4px 0 14px; }
.biz-card p { color: var(--text-dim); font-size: 15px; margin: 0; }
.biz-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; }
.biz-tags span { font-size: 12px; color: var(--text-dim); padding: 4px 12px; border-radius: 999px;
  border: 1px solid var(--border); background: rgba(255,255,255,.02); }

/* ===== Tabs (business scope) ===== */
.tabs { display: flex; justify-content: center; flex-wrap: wrap; gap: 12px; margin-bottom: 36px; }
.tab-btn { cursor: pointer; padding: 11px 24px; border-radius: 999px; font-size: 15px;
  border: 1px solid var(--border); background: var(--surface); color: var(--text-dim);
  transition: all .2s var(--ease); }
.tab-btn:hover { color: var(--text); }
.tab-btn.active { color: #04121f; background: var(--accent-grad); border-color: transparent; font-weight: 600; }
.tab-panels { max-width: 900px; margin: 0 auto; }
.tab-panel { display: none; }
.tab-panel.active { display: block; animation: fadeUp .4s var(--ease); }
@keyframes fadeUp { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }
.scope-card { padding: 32px 34px; }
.scope-card h3 { font-size: 22px; margin-bottom: 8px; }
.scope-card .scope-en { color: var(--text-mut); font-size: 13px; letter-spacing: .06em; margin-bottom: 20px; }
.scope-card p { color: var(--text-dim); font-size: 15px; }
.scope-list { list-style: none; padding: 0; margin: 18px 0 0; display: flex; flex-wrap: wrap; gap: 10px; }
.scope-list li { font-size: 14px; color: var(--text); padding: 7px 14px; border-radius: 10px;
  background: rgba(34,211,238,.06); border: 1px solid var(--border); }

/* ===== Values ===== */
.values-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; max-width: 880px; margin: 0 auto; }
.value-card { padding: 36px 34px; }
.value-num { font-size: 14px; color: var(--cyan); letter-spacing: .2em; margin-bottom: 14px; }
.value-card h3 { font-size: 28px; }
.value-en { color: var(--text-mut); letter-spacing: .08em; font-size: 14px; margin: -2px 0 14px; }
.value-card p { color: var(--text-dim); margin: 0; }
.value-quote { text-align: center; margin: 56px auto 0; max-width: 760px; font-size: clamp(20px, 3.4vw, 32px);
  font-weight: 700; background: var(--accent-grad); -webkit-background-clip: text; background-clip: text; color: transparent; }

/* ===== Contact ===== */
.contact-grid { display: grid; grid-template-columns: 1fr 1.1fr; gap: 28px; }
.contact-info { padding: 34px 36px; }
.contact-info h3 { font-size: 20px; margin-bottom: 20px; }
.contact-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 16px; }
.contact-list li { display: grid; grid-template-columns: 84px 1fr; gap: 14px; align-items: start; }
.ct-label { color: var(--cyan); font-size: 13px; padding-top: 2px; }
.contact-list li span:last-child { color: var(--text-dim); font-size: 15px; }
.contact-map { padding: 0; overflow: hidden; min-height: 280px; }
.map-fallback { position: relative; height: 100%; min-height: 280px; }
.map-fallback p { position: absolute; left: 16px; bottom: 14px; margin: 0; font-size: 13px; color: var(--text-dim);
  background: rgba(7,11,20,.6); padding: 6px 12px; border-radius: 8px; }

/* ===== Footer ===== */
.site-footer { border-top: 1px solid var(--border); padding: 40px 0; margin-top: 40px; }
.footer-inner { display: flex; justify-content: space-between; align-items: center; gap: 20px; flex-wrap: wrap; }
.footer-brand { display: flex; align-items: center; gap: 10px; }
.footer-logo { flex: none; opacity: .95; }
.footer-brand strong { font-size: 18px; }
.footer-brand p { margin: 4px 0 0; color: var(--text-mut); font-size: 13px; letter-spacing: .1em; }
.footer-legal { text-align: right; }
.footer-copy { color: var(--text-mut); font-size: 13px; margin: 0; }
.footer-icp { margin: 6px 0 0; font-size: 13px; }
.footer-icp a { color: var(--text-mut); transition: color .2s var(--ease); }
.footer-icp a:hover { color: var(--cyan); }

/* ===== Reveal animation ===== */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.reveal.in { opacity: 1; transform: none; }

/* ===== Responsive ===== */
@media (max-width: 960px) {
  .about-grid, .contact-grid { grid-template-columns: 1fr; }
  .biz-grid, .products-grid { grid-template-columns: repeat(2, 1fr); }
  .slide-visual { width: 62vw; right: -18%; opacity: .32; }
}
@media (max-width: 720px) {
  .nav-links { position: fixed; inset: var(--header-h) 0 auto 0; flex-direction: column; gap: 0;
    background: rgba(7,11,20,.96); backdrop-filter: blur(14px); border-bottom: 1px solid var(--border);
    padding: 8px 0; transform: translateY(-120%); transition: transform .3s var(--ease); }
  .nav-links.open { transform: translateY(0); }
  .nav-links a { padding: 14px 24px; }
  .nav-links a::after { display: none; }
  .nav-toggle { display: flex; }
  .biz-grid, .values-grid, .products-grid { grid-template-columns: 1fr; }
  .section { padding: 80px 0; }
  .hero-stats { gap: 26px; }
  .contact-list li { grid-template-columns: 70px 1fr; }
  .footer-legal { text-align: left; }

  .hero-slide { padding: calc(var(--header-h) + 16px) 0 118px; }
  .slide-title { font-size: clamp(29px, 9.2vw, 42px); }
  body[data-lang="en"] .slide-title { font-size: clamp(24px, 7.2vw, 38px); }
  .slide-desc { font-size: 14.5px; margin-bottom: 22px; }
  .slide-tags { gap: 8px; margin-bottom: 26px; }
  .slide-tags li { font-size: 11.5px; padding: 5px 12px; }
  .slide-visual { width: 120vw; right: -34%; top: 44%; opacity: .2; }
  .hero-controls { bottom: 22px; gap: 12px; }
  .hero-arrow { width: 36px; height: 36px; }
  .hero-dots button { width: 20px; }
  .hero-dots button.is-active { width: 34px; }
  .scroll-hint { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; scroll-behavior: auto !important; }
  .reveal { opacity: 1; transform: none; }
}