/* =========================================================
   贵州云想时代科技有限公司 — 官网样式
   视觉概念：工程图纸（描图纸底 / 朱红批注 / 图签栏）
   ========================================================= */

:root {
  /* 纸与墨 */
  --paper:        #EFF1EC;
  --paper-2:      #E7EBE4;
  --paper-sheet:  #FBFCFA;
  --ink:          #16221F;
  --ink-soft:     #2C3A36;
  --graphite:     #5A6B66;
  --rule:         #C9D0C8;
  --rule-soft:    #D8DDD5;
  --signal:       #C4471F;   /* 朱红：图纸批注色 */
  --signal-soft:  #E6D2C7;

  --font-display: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", SimSun, serif;
  --font-body:    "Noto Sans SC", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, sans-serif;
  --font-mono:    "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;

  --wrap: 1240px;
  --gut: clamp(20px, 5vw, 48px);
  --sec-y: clamp(72px, 8.5vw, 132px);

  --ease: cubic-bezier(.22, .61, .36, 1);
}

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

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background-color: var(--paper);
  background-image:
    linear-gradient(to right, rgba(22, 34, 31, .035) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(22, 34, 31, .035) 1px, transparent 1px);
  background-size: 34px 34px;
  color: var(--ink);
  font-family: var(--font-body);
  font-weight: 400;
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

h1, h2, h3 { margin: 0; font-weight: 400; }
p { margin: 0; }
ul, ol, dl, dd { margin: 0; padding: 0; }
li { list-style: none; }
img, svg { display: block; max-width: 100%; }

a { color: inherit; text-decoration: none; }

::selection { background: var(--signal); color: var(--paper-sheet); }

:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 3px;
  border-radius: 1px;
}

.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 200;
  background: var(--ink); color: var(--paper);
  padding: 10px 18px; font-family: var(--font-mono); font-size: 13px;
}
.skip-link:focus { left: 12px; top: 12px; }

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gut);
}

/* ---------------- 基础排版元素 ---------------- */

.eyebrow {
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--graphite);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 4px 10px;
  margin-bottom: 22px;
}
.eyebrow .sep { color: var(--signal); }

.section { padding-block: var(--sec-y); position: relative; }

.section-head { max-width: 760px; margin-bottom: clamp(40px, 5vw, 64px); }

.section-title {
  font-family: var(--font-display);
  font-size: clamp(28px, 3.6vw, 46px);
  line-height: 1.32;
  letter-spacing: .01em;
  color: var(--ink);
}

.section-note {
  margin-top: 18px;
  color: var(--graphite);
  max-width: 62ch;
  font-size: 15.5px;
}

/* 按钮 */
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 13px 26px;
  font-size: 14.5px;
  letter-spacing: .02em;
  border: 1px solid var(--ink);
  border-radius: 2px;
  transition: background .28s var(--ease), color .28s var(--ease),
              border-color .28s var(--ease), transform .28s var(--ease);
}
.btn-solid { background: var(--ink); color: var(--paper-sheet); }
.btn-solid:hover { background: var(--signal); border-color: var(--signal); transform: translateY(-2px); }
.btn-ghost { background: transparent; color: var(--ink); }
.btn-ghost:hover { border-color: var(--signal); color: var(--signal); transform: translateY(-2px); }
.btn-lg { padding: 16px 32px; font-size: 15.5px; }

/* ---------------- 顶栏 ---------------- */

.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(239, 241, 236, .88);
  backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--rule);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  min-height: 72px; gap: 24px;
}

.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark { width: 30px; height: 30px; fill: var(--ink); flex: none; }
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-cn {
  font-family: var(--font-display);
  font-size: 19px; letter-spacing: .1em; color: var(--ink);
}
.brand-en {
  font-family: var(--font-mono);
  font-size: 9.5px; letter-spacing: .26em; color: var(--graphite);
}

.site-nav { display: flex; align-items: center; gap: 30px; }
.site-nav a {
  font-size: 14.5px; color: var(--ink-soft);
  position: relative; padding-block: 4px;
  transition: color .2s var(--ease);
}
.site-nav a::after {
  content: ""; position: absolute; left: 0; bottom: 0;
  width: 100%; height: 1px; background: var(--signal);
  transform: scaleX(0); transform-origin: left;
  transition: transform .3s var(--ease);
}
.site-nav a:hover { color: var(--ink); }
.site-nav a:hover::after { transform: scaleX(1); }
.site-nav .nav-contact {
  border: 1px solid var(--ink); border-radius: 2px;
  padding: 9px 20px; font-size: 14px;
}
.site-nav .nav-contact::after { display: none; }
.site-nav .nav-contact:hover { background: var(--ink); color: var(--paper-sheet); }

.nav-toggle {
  display: none; width: 42px; height: 42px;
  background: none; border: 1px solid var(--rule);
  border-radius: 2px; cursor: pointer; padding: 0;
  position: relative;
}
.nav-toggle span {
  position: absolute; left: 11px; width: 20px; height: 1.5px;
  background: var(--ink); transition: transform .28s var(--ease), opacity .2s var(--ease);
}
.nav-toggle span:nth-child(1) { top: 17px; }
.nav-toggle span:nth-child(2) { top: 23px; }
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(3px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { transform: translateY(-3px) rotate(-45deg); }

.mobile-nav {
  border-top: 1px solid var(--rule);
  background: var(--paper);
  padding: 8px var(--gut) 22px;
}
.mobile-nav a {
  display: block; padding: 13px 0; font-size: 15.5px;
  border-bottom: 1px solid var(--rule-soft); color: var(--ink-soft);
}
.mobile-nav a:last-child { border-bottom: 0; color: var(--signal); }

/* ---------------- HERO ---------------- */

.hero { padding-block: clamp(56px, 7vw, 104px) clamp(48px, 6vw, 88px); }

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
  gap: clamp(40px, 6vw, 84px);
  align-items: center;
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(34px, 4.9vw, 60px);
  line-height: 1.22;
  letter-spacing: .005em;
  color: var(--ink);
  text-wrap: balance;
}
.hero-em {
  position: relative; display: inline-block; color: var(--signal);
}
.hero-em::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: .06em;
  height: 3px; background: var(--signal); opacity: .35;
  transform: scaleX(0); transform-origin: left;
  animation: sweep 1s var(--ease) .9s forwards;
}
@keyframes sweep { to { transform: scaleX(1); } }

.hero-lede {
  margin-top: 26px; max-width: 34em;
  font-size: clamp(15px, 1.15vw, 17px);
  color: var(--graphite); line-height: 1.9;
}

.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 36px; }

.hero-meta {
  display: flex; flex-wrap: wrap; gap: clamp(24px, 4vw, 56px);
  margin-top: clamp(44px, 5vw, 68px);
  padding-top: 26px; border-top: 1px solid var(--rule);
}
.hero-meta div { display: flex; flex-direction: column; gap: 4px; }
.hero-meta dt {
  font-family: var(--font-mono); font-size: 10.5px;
  letter-spacing: .18em; text-transform: uppercase; color: var(--graphite);
}
.hero-meta dd { font-size: 15px; color: var(--ink); }

/* 图纸面板 —— 全站记忆点 */
.sheet {
  margin: 0;
  background: var(--paper-sheet);
  border: 1px solid var(--rule);
  box-shadow: 0 1px 0 rgba(22,34,31,.04), 0 24px 60px -32px rgba(22,34,31,.35);
  position: relative;
}
.sheet::before {
  content: ""; position: absolute; inset: 10px;
  border: 1px solid var(--rule-soft); pointer-events: none;
}
.sheet-cap {
  display: flex; align-items: baseline; gap: 12px;
  padding: 16px 24px 0;
  font-family: var(--font-mono);
  font-size: 11px; letter-spacing: .08em; color: var(--graphite);
}
.sheet-cap-no { color: var(--signal); }
.sheet-svg { width: 100%; height: auto; padding: 6px 18px 20px; }

.ticks path { fill: none; stroke: var(--signal); stroke-width: 1.5; }
.construction { fill: none; stroke: var(--rule); stroke-width: 1; stroke-dasharray: 4 5; }
.cloud-path {
  fill: rgba(22,34,31,.05);
  stroke: var(--ink); stroke-width: 1.6;
  stroke-dasharray: 1; stroke-dashoffset: 1;
  animation: draw 2.2s var(--ease) .35s forwards;
}
@keyframes draw { to { stroke-dashoffset: 0; } }
.stack .bar { fill: var(--paper-sheet); stroke: var(--ink); stroke-width: 1; }
.stack .bar-accent { fill: rgba(196,71,31,.14); stroke: var(--signal); }
.stack-text text {
  font-family: var(--font-mono); font-size: 9.5px; letter-spacing: .02em;
  fill: var(--ink-soft);
}
.leader { fill: none; stroke: var(--signal); stroke-width: 1; }
.annots text {
  font-family: var(--font-mono); font-size: 11px; fill: var(--ink);
  paint-order: stroke; stroke: var(--paper-sheet); stroke-width: 3px; stroke-linejoin: round;
}
.tb-frame { fill: none; stroke: var(--ink); stroke-width: 1.1; }
.tb-rule { fill: none; stroke: var(--rule); stroke-width: 1; }
.tb-key text {
  font-family: var(--font-mono); font-size: 10px; fill: var(--graphite);
  letter-spacing: .08em;
}
.tb-val text {
  font-family: var(--font-mono); font-size: 10.5px; fill: var(--ink);
}

/* ---------------- 经营范围滚动带 ---------------- */

.marquee {
  background: var(--ink);
  color: var(--paper);
  padding-block: 15px;
  overflow: hidden;
  border-block: 1px solid var(--ink);
}
.marquee-track { display: flex; width: max-content; animation: slide 42s linear infinite; }
.marquee-group { display: flex; align-items: center; }
.marquee-item {
  font-family: var(--font-mono);
  font-size: 12.5px; letter-spacing: .14em;
  white-space: nowrap; padding-inline: 20px;
}
.marquee-dot { color: var(--signal); font-size: 13px; }
@keyframes slide { to { transform: translateX(-50%); } }
.marquee:hover .marquee-track { animation-play-state: paused; }

/* ---------------- 业务范围 ---------------- */

.service-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
}
.service {
  background: var(--paper);
  padding: clamp(28px, 3vw, 42px);
  transition: background .3s var(--ease);
  position: relative;
  min-width: 0;
}
.service:hover { background: var(--paper-sheet); }
.service-tag {
  font-family: var(--font-mono); font-size: 10.5px;
  letter-spacing: .2em; text-transform: uppercase;
  color: var(--signal); margin-bottom: 14px;
}
.service h3 {
  font-family: var(--font-display);
  font-size: 21px; letter-spacing: .02em;
  margin-bottom: 12px; color: var(--ink);
}
.service p { font-size: 14.8px; color: var(--graphite); line-height: 1.85; }

/* ---------------- 经营资质 ---------------- */

.section-scope { background: var(--paper-2); }

.scope-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: clamp(20px, 2.4vw, 32px);
  align-items: start;
}
.scope-grid > * { min-width: 0; }
.scope-card {
  background: var(--paper-sheet);
  border: 1px solid var(--rule);
  padding: clamp(26px, 3vw, 40px);
}
.scope-kind {
  font-family: var(--font-display);
  font-size: 26px; letter-spacing: .06em; color: var(--ink);
}
.scope-kind-en {
  font-family: var(--font-mono); font-size: 10px;
  letter-spacing: .22em; color: var(--signal);
  margin: 6px 0 22px; padding-bottom: 18px;
  border-bottom: 1px solid var(--rule);
}
.scope-list li {
  display: grid; grid-template-columns: 6.5em 1fr; gap: 14px;
  padding: 11px 0; border-bottom: 1px dashed var(--rule-soft);
  font-size: 14.2px; color: var(--graphite); line-height: 1.7;
}
.scope-list li:last-child { border-bottom: 0; }
.scope-key {
  font-family: var(--font-mono); font-size: 11px;
  letter-spacing: .08em; color: var(--ink);
}
.scope-note {
  margin-top: 20px; padding-top: 16px;
  border-top: 1px solid var(--rule);
  font-size: 12.5px; color: var(--graphite); line-height: 1.8;
}

.scope-card-dark { background: var(--ink); border-color: var(--ink); color: var(--paper); }
.scope-card-dark .scope-kind { color: var(--paper); }
.scope-card-dark .scope-kind-en { border-bottom-color: rgba(239,241,236,.18); }
.scope-card-dark .scope-list li { color: rgba(239,241,236,.72); border-bottom-color: rgba(239,241,236,.14); }
.scope-card-dark .scope-key { color: var(--signal); }
.scope-card-dark .scope-note { color: rgba(239,241,236,.55); border-top-color: rgba(239,241,236,.18); }
.scope-facts { margin-top: 24px; display: grid; gap: 12px; }
.scope-facts div { display: flex; justify-content: space-between; gap: 16px; align-items: baseline; }
.scope-facts dt {
  font-family: var(--font-mono); font-size: 11px;
  letter-spacing: .1em; color: rgba(239,241,236,.5);
}
.scope-facts dd { font-size: 13.5px; color: var(--paper); text-align: right; }

.scope-disclaimer {
  margin-top: 28px; font-size: 12.5px; color: var(--graphite);
  max-width: 70ch; line-height: 1.8;
}

/* ---------------- 合作方式（深色） ---------------- */

.section-dark { background: var(--ink); color: var(--paper); }
.section-dark .section-title { color: var(--paper); }
.section-dark .eyebrow { color: rgba(239,241,236,.55); }

.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 1px; background: rgba(239,241,236,.16);
  border: 1px solid rgba(239,241,236,.16);
}
.step { background: var(--ink); padding: clamp(26px, 2.6vw, 38px); min-width: 0; }
.step-no {
  font-family: var(--font-mono); font-size: 12px;
  letter-spacing: .16em; color: var(--signal);
  display: block; margin-bottom: 20px;
}
.step h3 {
  font-family: var(--font-display); font-size: 20px;
  letter-spacing: .04em; margin-bottom: 12px; color: var(--paper);
}
.step p { font-size: 14.2px; color: rgba(239,241,236,.62); line-height: 1.85; }

/* ---------------- 关于我们 ---------------- */

.about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(0, .75fr);
  gap: clamp(40px, 6vw, 88px);
  align-items: start;
}
.prose { margin-top: 26px; display: grid; gap: 18px; max-width: 58ch; }
.prose p { font-size: 15.5px; color: var(--ink-soft); line-height: 1.95; }

.about-facts { border-top: 1px solid var(--rule); }
.fact {
  display: grid; grid-template-columns: 6.5em 1fr; gap: 16px;
  padding: 16px 0; border-bottom: 1px solid var(--rule-soft);
  align-items: baseline;
}
.fact dt {
  font-family: var(--font-mono); font-size: 11px;
  letter-spacing: .12em; color: var(--graphite); text-transform: uppercase;
}
.fact dd { font-size: 15px; color: var(--ink); }
.fact-note { margin-top: 18px; font-size: 12.5px; color: var(--graphite); line-height: 1.8; }

/* ---------------- 联系我们 ---------------- */

.section-contact { background: var(--paper-2); }
.contact-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
  gap: clamp(40px, 6vw, 88px);
  align-items: start;
}
.contact-lede { margin: 20px 0 30px; color: var(--graphite); max-width: 40ch; font-size: 15.5px; }
.contact-list { border-top: 1px solid var(--rule); }
.contact-list li {
  display: grid; grid-template-columns: 6.5em 1fr; gap: 16px;
  padding: 18px 0; border-bottom: 1px solid var(--rule-soft);
  align-items: baseline;
}
.contact-key {
  font-family: var(--font-mono); font-size: 11px;
  letter-spacing: .12em; color: var(--graphite); text-transform: uppercase;
}
.contact-val { font-size: 15.5px; color: var(--ink); }
a.contact-val { transition: color .2s var(--ease); }
a.contact-val:hover { color: var(--signal); }

/* ---------------- 页脚 ---------------- */

.site-footer {
  background: var(--ink); color: rgba(239,241,236,.6);
  padding-block: clamp(40px, 4.5vw, 62px);
}
.footer-inner {
  display: flex; flex-wrap: wrap; gap: 28px 48px;
  align-items: flex-start; justify-content: space-between;
}
.footer-brand { display: flex; flex-direction: column; gap: 6px; }
.footer-name {
  font-family: var(--font-display); font-size: 18px;
  letter-spacing: .06em; color: var(--paper);
}
.footer-desc { font-size: 13px; }
.footer-nav { display: flex; flex-wrap: wrap; gap: 24px; }
.footer-nav a { font-size: 13.5px; transition: color .2s var(--ease); }
.footer-nav a:hover { color: var(--signal); }
.footer-legal {
  width: 100%; padding-top: 24px; border-top: 1px solid rgba(239,241,236,.14);
  font-family: var(--font-mono); font-size: 11px; letter-spacing: .06em;
  color: rgba(239,241,236,.4);
}
.footer-legal .sep { color: var(--signal); margin-inline: 10px; }

/* ---------------- 入场动画 ---------------- */

.load {
  opacity: 0; transform: translateY(16px);
  animation: rise .85s var(--ease) forwards;
  animation-delay: calc(var(--d, 0) * 90ms + 60ms);
}
@keyframes rise { to { opacity: 1; transform: none; } }

[data-reveal] {
  opacity: 0; transform: translateY(20px);
  transition: opacity .8s var(--ease), transform .8s var(--ease);
}
[data-reveal].is-in { opacity: 1; transform: none; }

/* ---------------- 响应式 ---------------- */

@media (max-width: 1000px) {
  .hero-grid { grid-template-columns: minmax(0, 1fr); }
  .sheet { max-width: 640px; }
  .about-grid, .contact-grid { grid-template-columns: minmax(0, 1fr); }
  .service-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 760px) {
  .site-nav { display: none; }
  .nav-toggle { display: block; }
  .hero-meta { gap: 22px 30px; }
  .scope-list li, .fact, .contact-list li { grid-template-columns: 1fr; gap: 4px; }
  .scope-facts div { flex-direction: column; gap: 2px; align-items: flex-start; }
  .scope-facts dd { text-align: left; }
  .footer-inner { flex-direction: column; }
  .service-grid { grid-template-columns: minmax(0, 1fr); }
  .eyebrow { font-size: 10.5px; letter-spacing: .12em; }
  .hero-meta { gap: 18px 26px; }
}

@media (max-width: 460px) {
  .hero-actions .btn { width: 100%; justify-content: center; }
  .sheet-svg { padding: 4px 8px 14px; }
}

/* ---------------- 无障碍：降低动效 ---------------- */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
  .load, [data-reveal] { opacity: 1; transform: none; }
  .cloud-path { stroke-dashoffset: 0; }
  .hero-em::after { transform: scaleX(1); }
}