/* =========================================================
   纷繁网络科技 · 官网门户静态站点
   Design tokens
   ========================================================= */
:root {
  --ink:        #0A0C10;
  --ink-2:      #101319;
  --panel:      #14181F;
  --panel-2:    #1A1F27;
  --line:       rgba(198, 161, 91, 0.18);
  --line-soft:  rgba(242, 239, 233, 0.10);
  --text:       #F2EFE9;
  --text-2:     #B9B3A8;
  --text-3:     #8A8479;
  --gold:       #C6A15B;
  --gold-2:     #E3C68A;
  --radius:     2px;
  --radius-lg:  4px;
  --container:  1240px;
  --ease:       cubic-bezier(0.22, 0.61, 0.36, 1);

  --font-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", "SimSun", Georgia, serif;
  --font-sans:  "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Sarasa Gothic SC", -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-en:    "Optima", "Times New Roman", Georgia, serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--ink);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
h1, h2, h3, h4 { font-family: var(--font-serif); font-weight: 500; margin: 0; letter-spacing: 0.02em; }
p { margin: 0; }

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 40px;
}

/* ---------- 通用元件 ---------- */
.eyebrow {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.28em;
  color: var(--gold);
  text-transform: uppercase;
  margin-bottom: 22px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 16px 34px;
  font-size: 15px;
  letter-spacing: 0.06em;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all .35s var(--ease);
  font-family: var(--font-sans);
}
.btn-primary {
  background: linear-gradient(135deg, var(--gold-2), var(--gold));
  color: #14100A;
  font-weight: 600;
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 14px 34px rgba(198, 161, 91, 0.24); }
.btn-ghost { border-color: var(--line); color: var(--text); background: transparent; }
.btn-ghost:hover { border-color: var(--gold); color: var(--gold-2); transform: translateY(-2px); }
.btn-block { width: 100%; }

/* ---------- 页头 ---------- */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 90;
  transition: background .4s var(--ease), border-color .4s var(--ease);
  border-bottom: 1px solid transparent;
}
.site-header.is-scrolled {
  background: rgba(10, 12, 16, 0.88);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom-color: var(--line-soft);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 84px; }
.is-scrolled .header-inner { height: 72px; }

.brand { display: inline-flex; align-items: center; gap: 14px; }
.brand-mark { width: 34px; height: 34px; color: var(--text); display: block; }
.brand-mark svg { width: 100%; height: 100%; display: block; }
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-text strong { font-family: var(--font-serif); font-size: 18px; font-weight: 500; letter-spacing: 0.08em; }
.brand-text em {
  font-style: normal;
  font-family: var(--font-en);
  font-size: 10px;
  letter-spacing: 0.34em;
  color: var(--gold);
  margin-top: 3px;
}

.nav { display: flex; align-items: center; gap: 34px; }
.nav-link { font-size: 14.5px; color: var(--text-2); position: relative; transition: color .3s var(--ease); }
.nav-link::after {
  content: ""; position: absolute; left: 0; bottom: -6px;
  width: 0; height: 1px; background: var(--gold); transition: width .3s var(--ease);
}
.nav-link:hover, .nav-link.is-active { color: var(--text); }
.nav-link:hover::after, .nav-link.is-active::after { width: 100%; }
.nav-cta { border: 1px solid var(--line); padding: 10px 22px; border-radius: var(--radius); color: var(--gold-2); }
.nav-cta::after { display: none; }
.nav-cta:hover { background: rgba(198, 161, 91, 0.10); border-color: var(--gold); }

.nav-toggle {
  display: none; width: 42px; height: 42px;
  background: none; border: 0; cursor: pointer;
  flex-direction: column; justify-content: center; gap: 5px; padding: 0;
}
.nav-toggle span { display: block; height: 1px; width: 22px; margin: 0 auto; background: var(--text); transition: all .3s var(--ease); }
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* ---------- 图片框（统一视觉语言） ---------- */
.media-frame { position: relative; width: 100%; }
.media-frame::before {
  content: "";
  position: absolute;
  inset: 22px -22px -22px 22px;
  border: 1px solid var(--line);
  z-index: 0;
}
.media-frame img {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: var(--radius);
  filter: saturate(0.92) contrast(1.04);
}

/* ---------- 英雄区 ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 150px 0 110px;
  overflow: hidden;
  background:
    radial-gradient(1200px 700px at 78% 18%, rgba(198, 161, 91, 0.16), transparent 62%),
    radial-gradient(900px 620px at 8% 82%, rgba(96, 122, 140, 0.14), transparent 60%),
    var(--ink);
}
.hero-grid-lines {
  position: absolute; inset: 0;
  background-image: linear-gradient(to right, rgba(242,239,233,0.045) 1px, transparent 1px);
  background-size: 124px 100%;
  mask-image: linear-gradient(to bottom, transparent, #000 30%, #000 70%, transparent);
  -webkit-mask-image: linear-gradient(to bottom, transparent, #000 30%, #000 70%, transparent);
  pointer-events: none;
}
.hero-glow {
  position: absolute; width: 620px; height: 620px; right: -140px; top: -120px;
  background: radial-gradient(circle at 50% 50%, rgba(226, 198, 138, 0.20), transparent 66%);
  filter: blur(20px); pointer-events: none;
}
.hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 0.78fr);
  gap: 70px;
  align-items: center;
}

.kicker { display: inline-flex; align-items: center; gap: 14px; font-size: 12px; letter-spacing: 0.24em; color: var(--gold-2); }
.kicker-rule { width: 42px; height: 1px; background: var(--gold); }

.hero-title { font-size: clamp(38px, 4.9vw, 64px); line-height: 1.3; margin: 26px 0 30px; }
.hero-title em { font-style: normal; color: var(--gold-2); }
.hero-sub { max-width: 560px; color: var(--text-2); font-size: 16.5px; line-height: 2.0; font-weight: 300; }
.hero-actions { display: flex; gap: 16px; margin-top: 40px; flex-wrap: wrap; }

.hero-stats {
  display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 18px;
  margin: 62px 0 0; padding-top: 34px; border-top: 1px solid var(--line-soft);
}
.stat dt { font-family: var(--font-en); font-size: 30px; line-height: 1.1; color: var(--gold-2); font-weight: 600; }
.stat dd { margin: 8px 0 0; font-size: 12.5px; color: var(--text-3); letter-spacing: 0.08em; }

.hero-visual { position: relative; }
.hero-visual .media-frame { max-width: 400px; margin-left: auto; aspect-ratio: 2 / 3; }
.visual-card {
  position: absolute;
  left: 0; bottom: 8%;
  background: rgba(20, 24, 31, 0.88);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  padding: 20px 24px;
  display: flex; flex-direction: column; gap: 7px;
  box-shadow: 0 26px 60px rgba(0, 0, 0, 0.5);
  animation: float 11s ease-in-out infinite;
  z-index: 2;
}
.vc-label { font-family: var(--font-en); font-size: 10px; letter-spacing: 0.3em; color: var(--gold); }
.vc-title { font-family: var(--font-serif); font-size: 16px; color: var(--text); }
.vc-code { font-family: var(--font-en); font-size: 12.5px; letter-spacing: 0.12em; color: var(--text-3); }

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-12px); }
}

.scroll-hint {
  position: absolute; left: 50%; bottom: 34px; transform: translateX(-50%);
  width: 22px; height: 40px; border: 1px solid var(--line); border-radius: 12px;
  display: flex; justify-content: center;
}
.scroll-hint span { width: 1px; height: 8px; background: var(--gold); margin-top: 8px; animation: scrollDot 1.8s ease-in-out infinite; }
@keyframes scrollDot {
  0% { opacity: 0; transform: translateY(0); }
  40% { opacity: 1; }
  100% { opacity: 0; transform: translateY(14px); }
}

/* ---------- 区块通用 ---------- */
.section { padding: 130px 0; position: relative; }
.section-alt { background: var(--ink-2); border-block: 1px solid var(--line-soft); }

.section-head { max-width: 800px; margin-bottom: 60px; }
.section-title { font-size: clamp(28px, 3.3vw, 42px); line-height: 1.42; margin-bottom: 22px; }
.section-desc { color: var(--text-2); font-weight: 300; font-size: 16px; line-height: 2.0; }

/* ---------- 关于 ---------- */
.pillar-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 26px; }
.pillar {
  background: var(--panel); border: 1px solid var(--line-soft); border-radius: var(--radius-lg);
  padding: 40px 34px;
  transition: transform .4s var(--ease), border-color .4s var(--ease), background .4s var(--ease);
}
.pillar:hover { transform: translateY(-6px); border-color: var(--line); background: var(--panel-2); }
.pillar-index { font-family: var(--font-en); font-size: 20px; color: var(--gold); letter-spacing: 0.1em; }
.pillar h3 { font-size: 21px; margin: 14px 0 14px; }
.pillar p { color: var(--text-2); font-size: 14.5px; font-weight: 300; line-height: 1.95; }

/* ---------- 双栏（软件开发 / 网络技术） ---------- */
.split { display: grid; grid-template-columns: minmax(0, 0.74fr) minmax(0, 1.26fr); gap: 76px; align-items: center; }
.split-reverse .split-media { order: 2; }
.split-media .media-frame { aspect-ratio: 1 / 1; max-width: 460px; }
.split-reverse .split-media .media-frame { margin-left: auto; }
.split-copy .section-desc { margin-bottom: 42px; }

.cap-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 30px 32px; }
.cap { border-top: 1px solid var(--line-soft); padding-top: 20px; }
.cap-no { font-family: var(--font-en); font-size: 12px; letter-spacing: 0.2em; color: var(--gold); }
.cap h3 { font-size: 17.5px; margin: 10px 0 10px; line-height: 1.5; }
.cap p { color: var(--text-2); font-size: 13.5px; font-weight: 300; line-height: 1.9; }

.tech-stack { margin-top: 42px; border-top: 1px solid var(--line-soft); padding-top: 26px; }
.stack-label { display: block; font-size: 12px; letter-spacing: 0.2em; color: var(--text-3); margin-bottom: 16px; }
.stack-list { list-style: none; display: flex; flex-wrap: wrap; gap: 9px; padding: 0; margin: 0; }
.stack-list li {
  font-size: 12.5px; color: var(--text-2);
  border: 1px solid var(--line-soft); padding: 6px 13px; border-radius: var(--radius);
  transition: all .3s var(--ease);
}
.stack-list li:hover { border-color: var(--gold); color: var(--gold-2); }

/* ---------- 延伸业务 ---------- */
.more-grid { display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); gap: 22px; }
.more {
  grid-column: span 3;
  background: var(--panel); border: 1px solid var(--line-soft); border-radius: var(--radius-lg);
  padding: 34px 30px;
  transition: transform .4s var(--ease), border-color .4s var(--ease), background .4s var(--ease);
}
.more:hover { transform: translateY(-6px); border-color: var(--line); background: var(--panel-2); }
.more-no { font-family: var(--font-en); font-size: 12px; letter-spacing: 0.2em; color: var(--gold); }
.more h3 { font-size: 19px; margin: 12px 0 10px; }
.more > p { color: var(--text-2); font-size: 13.5px; font-weight: 300; line-height: 1.9; }

.cap-list { list-style: none; margin: 16px 0 0; padding: 0; border-top: 1px solid var(--line-soft); }
.cap-list li {
  position: relative; font-size: 13px; color: var(--text-3); font-weight: 300;
  padding: 9px 0 9px 18px; border-bottom: 1px solid var(--line-soft);
}
.cap-list li::before {
  content: ""; position: absolute; left: 0; top: 18px;
  width: 6px; height: 1px; background: var(--gold);
}

/* ---------- 零售与互联网销售 ---------- */
.retail-grid { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 22px; }
.retail {
  background: var(--panel); border: 1px solid var(--line-soft); border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: transform .4s var(--ease), border-color .4s var(--ease), background .4s var(--ease);
}
.retail:hover { transform: translateY(-6px); border-color: var(--line); background: var(--panel-2); }
.rt-en { font-family: var(--font-en); font-size: 11px; letter-spacing: 0.28em; color: var(--gold); }
.retail h3 { font-size: 18.5px; margin: 12px 0 10px; }
.retail p { color: var(--text-2); font-size: 13.5px; font-weight: 300; line-height: 1.9; }
.retail-accent {
  border-color: var(--line);
  background: linear-gradient(150deg, rgba(198, 161, 91, 0.10), rgba(198, 161, 91, 0) 62%), var(--panel);
}

/* ---------- 案例 ---------- */
.work-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 28px; }
.work {
  margin: 0; background: var(--panel); border: 1px solid var(--line-soft);
  border-radius: var(--radius-lg); overflow: hidden;
  transition: transform .5s var(--ease), border-color .5s var(--ease);
}
.work:hover { transform: translateY(-6px); border-color: var(--line); }
.work-thumb { height: 210px; overflow: hidden; }
.work-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform .8s var(--ease); filter: saturate(0.92); }
.work:hover .work-thumb img { transform: scale(1.05); }
.work figcaption { padding: 28px 30px 32px; }
.work-tag { font-size: 11px; letter-spacing: 0.2em; color: var(--gold); font-family: var(--font-en); }
.work h3 { font-size: 20px; margin: 12px 0 10px; }
.work p { color: var(--text-2); font-size: 13.5px; font-weight: 300; line-height: 1.9; }

/* ---------- 流程 ---------- */
.process-list {
  list-style: none; padding: 0; margin: 0;
  display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 22px;
}
.process-step {
  padding: 36px 30px; background: var(--panel);
  border: 1px solid var(--line-soft); border-radius: var(--radius-lg);
  transition: border-color .4s var(--ease), background .4s var(--ease);
}
.process-step:hover { border-color: var(--line); background: var(--panel-2); }
.ps-no { font-family: var(--font-en); font-size: 26px; color: rgba(198, 161, 91, 0.6); letter-spacing: 0.06em; }
.process-step h3 { font-size: 18.5px; margin: 12px 0 12px; }
.process-step p { color: var(--text-2); font-size: 13.5px; font-weight: 300; line-height: 1.9; }

/* ---------- 联系 ---------- */
.contact-wrap { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 0.85fr); gap: 70px; align-items: start; }
.contact-info { margin-top: 44px; border-top: 1px solid var(--line-soft); }
.ci-item {
  display: grid; grid-template-columns: 120px minmax(0, 1fr); gap: 20px;
  padding: 22px 0; border-bottom: 1px solid var(--line-soft);
}
.ci-label { font-size: 12.5px; letter-spacing: 0.14em; color: var(--text-3); }
.ci-value { font-size: 15px; color: var(--text); font-weight: 300; }
.ci-tip {
  display: inline-block; margin-left: 10px; font-size: 11px; color: var(--gold);
  border: 1px solid var(--line); padding: 2px 8px; border-radius: var(--radius); vertical-align: middle;
}

.contact-form {
  background: var(--panel); border: 1px solid var(--line-soft);
  border-radius: var(--radius-lg); padding: 44px 40px;
}
.field { margin-bottom: 22px; }
.field label { display: block; font-size: 12.5px; letter-spacing: 0.14em; color: var(--text-3); margin-bottom: 10px; }
.field input, .field select, .field textarea {
  width: 100%; background: var(--ink); border: 1px solid var(--line-soft); color: var(--text);
  font-family: var(--font-sans); font-size: 14.5px; padding: 13px 16px; border-radius: var(--radius);
  outline: none; transition: border-color .3s var(--ease), background .3s var(--ease);
}
.field textarea { resize: vertical; line-height: 1.8; }
.field input::placeholder, .field textarea::placeholder { color: #5F5B54; }
.field input:focus, .field select:focus, .field textarea:focus { border-color: var(--gold); background: #0C0E13; }
.field-error { display: block; min-height: 16px; font-size: 12px; color: #D98A6A; margin-top: 6px; }
.field.has-error input, .field.has-error select, .field.has-error textarea { border-color: #D98A6A; }
.form-note { margin-top: 18px; font-size: 12px; color: var(--text-3); line-height: 1.8; }
.form-success {
  margin-top: 16px; padding: 14px 16px; border: 1px solid var(--line);
  background: rgba(198, 161, 91, 0.08); color: var(--gold-2); font-size: 14px; border-radius: var(--radius);
}

/* ---------- 页脚 ---------- */
.site-footer { background: #070809; border-top: 1px solid var(--line-soft); padding: 90px 0 0; }
.footer-top {
  display: grid; grid-template-columns: minmax(0, 1.25fr) repeat(4, minmax(0, 1fr));
  gap: 44px; padding-bottom: 56px;
}
.footer-brand-text { margin-bottom: 20px; }
.footer-brand p { color: var(--text-3); font-size: 14px; font-weight: 300; line-height: 2.0; max-width: 320px; }
.footer-brand-links { display: flex; flex-wrap: wrap; gap: 18px; margin-top: 22px; }
.footer-brand-links a { font-size: 13px; color: var(--gold-2); font-weight: 300; transition: color .3s var(--ease); }
.footer-brand-links a:hover { color: var(--text); }
.footer-col h4 { font-size: 12px; letter-spacing: 0.2em; color: var(--gold); margin-bottom: 20px; font-weight: 500; }
.footer-col a { display: block; font-size: 14px; color: var(--text-3); padding: 7px 0; font-weight: 300; transition: color .3s var(--ease); }
.footer-col a:hover { color: var(--text); }
.footer-bottom {
  border-top: 1px solid var(--line-soft); padding: 26px 0 34px;
  display: flex; justify-content: space-between; gap: 20px; flex-wrap: wrap;
  font-size: 12.5px; color: var(--text-3);
}

/* ---------- 入场动画 ---------- */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity .9s var(--ease), transform .9s var(--ease); }
.reveal.is-visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .visual-card, .scroll-hint span { animation: none; }
}

/* ---------- 响应式 ---------- */
@media (max-width: 1080px) {
  .container { padding: 0 28px; }
  .nav { gap: 24px; }
  .nav-link { font-size: 14px; }
  .nav-cta { padding: 9px 18px; }
  .retail-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .hero-inner { grid-template-columns: 1fr; gap: 56px; }
  .hero-visual .media-frame { max-width: 340px; margin: 0 auto; }
  .visual-card { left: 50%; transform: translateX(-50%); bottom: -14px; }
  .split { grid-template-columns: 1fr; gap: 48px; }
  .split-reverse .split-media { order: 0; }
  .split-media .media-frame { max-width: 420px; margin: 0 auto; }
  .pillar-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .process-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .work-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .more { grid-column: span 3; }
  .contact-wrap { grid-template-columns: 1fr; gap: 56px; }
  .footer-top { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (max-width: 860px) {
  .nav {
    position: fixed; inset: 72px 0 auto 0; flex-direction: column; align-items: flex-start; gap: 4px;
    background: rgba(10, 12, 16, 0.97);
    backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
    padding: 22px 28px 30px; border-bottom: 1px solid var(--line-soft);
    transform: translateY(-12px); opacity: 0; pointer-events: none;
    transition: all .35s var(--ease);
  }
  .nav.is-open { opacity: 1; transform: none; pointer-events: auto; }
  .nav-link { font-size: 16px; padding: 12px 0; width: 100%; }
  .nav-cta { margin-top: 12px; text-align: center; padding: 13px 22px; }
  .nav-toggle { display: flex; }

  .hero { min-height: auto; padding: 130px 0 90px; }
  .hero-stats { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 26px 18px; }
  .section { padding: 90px 0; }
  .cap-grid { grid-template-columns: 1fr; gap: 26px; }
  .footer-top { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 38px; }
}

@media (max-width: 560px) {
  .container { padding: 0 20px; }
  .hero-actions .btn { width: 100%; }
  .pillar-grid, .process-list, .work-grid, .more-grid, .retail-grid { grid-template-columns: 1fr; }
  .more { grid-column: span 1; }
  .contact-form { padding: 32px 24px; }
  .ci-item { grid-template-columns: 1fr; gap: 6px; }
  .media-frame::before { inset: 14px -14px -14px 14px; }
}