/* ==========================================================================
   正坦科技 · 官网样式表
   设计语言：硬边直角 + 1px 细线 + 大字号 + 深青绿体系
   无框架、无依赖，单文件即可运行
   ========================================================================== */

/* ---------- 1. Tokens ---------- */
:root {
  /* 品牌色 */
  --ink: #072B28;        /* 墨青 */
  --brand: #0E5A50;      /* 正坦青 */
  --brand-2: #0A453D;    /* 正坦青深 */
  --blue: #2E8FB0;       /* 活水蓝 */
  --sage: #7DA98C;       /* 苔痕绿（深色底用） */
  --sage-text: #4F7A5E;  /* 苔痕绿（浅色底小字用，保证对比度） */

  /* 中性色 */
  --paper: #F3F1EA;      /* 雾白 */
  --paper-2: #F7F6F1;
  --card: #FFFFFF;
  --text: #242A28;
  --body: #4A4F4C;
  --muted: #6B706C;
  --faint: #9A9E96;
  --line: #E0DCCF;
  --line-2: #E8E4D8;

  /* 深色区 */
  --on-dark: #F3F1EA;
  --on-dark-2: #9FBDB0;
  --on-dark-3: #7DA98C;
  --line-dark: #1E4A44;

  /* 尺寸 */
  --wrap: 1200px;
  --gutter: 24px;
  --section-y: 80px;
  --radius: 0px;         /* 刻意保留 0：工业感 */

  /* 字体 */
  --sans: "Noto Sans SC", "Source Han Sans SC", "PingFang SC",
          "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --mono: "Inter", "SF Mono", "Roboto Mono", ui-monospace, monospace;

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

/* ---------- 2. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.75;
  color: var(--text);
  background: var(--card);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img, svg { display: block; max-width: 100%; }
/* 实拍图：填满父容器（父容器负责 aspect-ratio 与 overflow） */
.ph { width: 100%; height: 100%; object-fit: cover; object-position: center; }
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; color: inherit; }
button { background: none; border: 0; cursor: pointer; }
h1, h2, h3, h4, p, ul, ol, figure { margin: 0; }
ul, ol { padding: 0; list-style: none; }
table { border-collapse: collapse; width: 100%; }
:focus-visible { outline: 2px solid var(--blue); outline-offset: 3px; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .001ms !important; transition-duration: .001ms !important; }
}

/* ---------- 3. Layout ---------- */
.wrap {
  width: 100%;
  max-width: calc(var(--wrap) + var(--gutter) * 2);
  margin: 0 auto;
  padding: 0 var(--gutter);
}
.section { padding: var(--section-y) 0; }
.section--tight { padding: 64px 0; }
.section--paper { background: var(--paper); }
.section--dark { background: var(--ink); color: var(--on-dark); }
.section--brand { background: var(--brand); color: var(--on-dark); }

.grid { display: grid; gap: 24px; }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--12 { grid-template-columns: repeat(12, 1fr); }

/* ---------- 4. Typography ---------- */
.eyebrow {
  font-size: 11px;
  letter-spacing: .18em;
  font-weight: 500;
  color: var(--brand);
  text-transform: none;
}
.eyebrow--light { color: var(--on-dark-3); }

.h1 {
  font-size: clamp(34px, 4.4vw, 62px);
  line-height: 1.16;
  font-weight: 700;
  letter-spacing: -.01em;
  margin: 18px 0 0;
}
.h2 {
  font-size: clamp(26px, 2.9vw, 38px);
  line-height: 1.28;
  font-weight: 700;
  letter-spacing: -.005em;
}
.h3 {
  font-size: 25px;
  line-height: 1.35;
  font-weight: 600;
  letter-spacing: .01em;
}
.lead { font-size: 15px; line-height: 1.95; color: var(--on-dark-2); }
.body { font-size: 13.5px; line-height: 1.95; color: var(--body); }
.small { font-size: 12px; line-height: 1.8; color: var(--body); }
.tiny { font-size: 11px; line-height: 1.7; color: var(--muted); }

.num {
  font-family: var(--mono);
  font-feature-settings: "tnum" 1;
  font-weight: 600;
  letter-spacing: -.01em;
}

/* 小节头（左标题 + 右侧说明/链接） */
.sec-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 40px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 40px;
}
.sec-head__text { max-width: 720px; }
.sec-head__aside { max-width: 424px; font-size: 13.5px; line-height: 1.9; color: var(--body); padding-bottom: 6px; }
.sec-head__aside a { color: var(--brand); border-bottom: 1px solid currentColor; padding-bottom: 2px; }
.sec-head--light { border-bottom-color: var(--line-dark); }
.sec-head--light .sec-head__aside { color: var(--on-dark-2); }

/* ---------- 5. Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  height: 52px;
  padding: 0 28px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-size: 14.5px;
  font-weight: 500;
  letter-spacing: .02em;
  transition: background .2s var(--ease), color .2s var(--ease), border-color .2s var(--ease);
  white-space: nowrap;
}
.btn--solid { background: var(--paper); color: var(--ink); }
.btn--solid:hover { background: #fff; }
.btn--brand { background: var(--brand); color: var(--paper); }
.btn--brand:hover { background: var(--brand-2); }
.btn--blue { background: var(--blue); color: #fff; }
.btn--blue:hover { background: #277C99; }
.btn--ghost { border-color: #2F6A60; color: var(--on-dark); }
.btn--ghost:hover { background: rgba(243, 241, 234, .06); border-color: var(--on-dark-2); }
.btn--dark { background: var(--ink); color: var(--paper); }
.btn--dark:hover { background: #0B3A35; }
.btn--sm { height: 40px; padding: 0 20px; font-size: 13.5px; }

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12.5px;
  font-weight: 500;
  letter-spacing: .04em;
  color: var(--brand);
  transition: gap .2s var(--ease);
}
.link-arrow::after { content: "→"; font-family: var(--mono); }
.link-arrow:hover { gap: 14px; }
.link-arrow--light { color: var(--on-dark-2); }
.link-arrow--blue { color: var(--blue); }

/* ---------- 6. 顶部服务条 ---------- */
.utility {
  background: var(--ink);
  color: var(--on-dark-3);
  font-size: 11.5px;
}
.utility__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  height: 36px;
}
.utility__left { color: var(--on-dark-3); }
.utility__right { display: flex; align-items: center; gap: 22px; }
.utility__right a { color: var(--on-dark-2); }
.utility__right a:hover { color: var(--on-dark); }
.utility__tel { display: inline-flex; align-items: center; gap: 8px; }
.utility__tel b { font-family: var(--mono); font-weight: 500; color: var(--on-dark); letter-spacing: .02em; }

/* ---------- 7. 页头 ---------- */
.header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: #fff;
  border-bottom: 1px solid var(--line);
  transition: box-shadow .25s var(--ease);
}
.header.is-scrolled { box-shadow: 0 1px 0 rgba(7, 43, 40, .08), 0 12px 28px -20px rgba(7, 43, 40, .35); }
.header__inner {
  display: flex;
  align-items: center;
  gap: 32px;
  height: 80px;
}
.brand { display: inline-flex; align-items: center; gap: 12px; flex: none; }
.brand__mark { width: 38px; height: 38px; flex: none; }
.brand__mark path { fill: none; stroke: var(--brand); stroke-width: 10; stroke-linejoin: miter; }
.brand__text { display: flex; flex-direction: column; line-height: 1.1; }
.brand__cn { font-size: 19px; font-weight: 600; letter-spacing: .06em; color: var(--ink); }
.brand__en { font-size: 8px; letter-spacing: .16em; color: var(--muted); font-family: var(--mono); margin-top: 5px; }

.nav { display: flex; align-items: center; gap: 4px; margin-left: 8px; }
.nav__item { position: relative; }
.nav__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 12px;
  font-size: 14.5px;
  font-weight: 500;
  color: var(--text);
  transition: color .18s var(--ease);
}
.nav__link:hover, .nav__item.is-active > .nav__link { color: var(--brand); }
.nav__item.is-active::after {
  content: "";
  position: absolute;
  left: 12px; right: 12px; bottom: -25px;
  height: 2px;
  background: var(--brand);
}
.nav__caret { width: 9px; height: 7px; }
.nav__caret path { fill: none; stroke: currentColor; stroke-width: 1.3; }

/* 下拉 */
.nav__panel {
  position: absolute;
  top: calc(100% + 24px);
  left: 0;
  min-width: 520px;
  background: #fff;
  border: 1px solid var(--line);
  padding: 24px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px 28px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition: opacity .18s var(--ease), transform .18s var(--ease), visibility .18s;
  box-shadow: 0 24px 48px -32px rgba(7, 43, 40, .4);
}
.nav__item:hover .nav__panel,
.nav__item:focus-within .nav__panel { opacity: 1; visibility: visible; transform: translateY(0); }
.nav__panel a {
  display: block;
  padding: 10px 0;
  border-bottom: 1px solid var(--line-2);
  font-size: 13.5px;
  color: var(--body);
}
.nav__panel a:hover { color: var(--brand); }
.nav__panel a span { display: block; font-size: 11px; color: var(--faint); margin-top: 2px; }

.header__actions { display: flex; align-items: center; gap: 16px; margin-left: auto; }
.header__search { width: 18px; height: 18px; }
.header__search * { fill: none; stroke: var(--text); stroke-width: 1.4; }

/* 移动端菜单按钮 */
.burger { display: none; width: 44px; height: 44px; align-items: center; justify-content: center; }
.burger span { display: block; width: 20px; height: 1.5px; background: var(--ink); position: relative; }
.burger span::before, .burger span::after {
  content: ""; position: absolute; left: 0; width: 20px; height: 1.5px; background: var(--ink);
}
.burger span::before { top: -6px; }
.burger span::after { top: 6px; }

/* ---------- 8. Hero ---------- */
.hero {
  position: relative;
  background: var(--ink);
  color: var(--on-dark);
  overflow: hidden;
  padding: 96px 0 72px;
}
.hero__bg { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; }
.hero__inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 448px;
  gap: 72px;
  align-items: start;
}
.hero__copy { padding-top: 6px; }
.hero__sector {
  margin-top: 64px;
  padding-top: 20px;
  border-top: 1px solid var(--line-dark);
  display: flex;
  gap: 18px;
  align-items: baseline;
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--on-dark-3);
}
.hero__sector b { font-weight: 400; color: var(--on-dark-3); opacity: .6; letter-spacing: .18em; font-size: 10.5px; }
.hero__cta { display: flex; gap: 16px; margin-top: 38px; flex-wrap: wrap; }
.hero__trust {
  margin-top: 26px;
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--on-dark-3);
}

/* 工况速评卡 */
.assess {
  border: 1px solid #25564D;
  background: rgba(6, 42, 38, .55);
  backdrop-filter: blur(2px);
  padding: 0;
}
.assess__bar { height: 3px; width: 64px; background: var(--blue); }
.assess__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 18px 24px 14px;
  border-bottom: 1px solid #1C463F;
}
.assess__title { font-size: 16px; font-weight: 600; letter-spacing: .06em; }
.assess__hint { font-size: 10px; color: var(--on-dark-3); }
.assess__sub { padding: 12px 24px 0; font-size: 10.5px; color: #6E9084; }
.assess__fields { padding: 6px 24px 0; }
.assess__row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid #1C463F;
}
.assess__row label { font-size: 10.5px; color: var(--on-dark-3); flex: none; }
.assess__row input, .assess__row select {
  width: 150px;
  background: transparent;
  border: 0;
  border-bottom: 1px dashed transparent;
  text-align: right;
  font-size: 13px;
  font-weight: 500;
  color: var(--on-dark);
  font-family: var(--mono);
  padding: 2px 0;
}
.assess__row select { font-family: var(--sans); cursor: pointer; }
.assess__row input:focus, .assess__row select:focus { outline: none; border-bottom-color: var(--blue); }
.assess__row option { background: var(--ink); color: var(--on-dark); }
.assess__out { padding: 20px 24px 0; }
.assess__out-label { font-size: 9.5px; letter-spacing: .18em; color: var(--on-dark-3); }
.assess__out-grid { display: flex; gap: 24px; margin-top: 10px; }
.assess__num { font-family: var(--mono); font-size: 26px; font-weight: 600; line-height: 1.2; }
.assess__num--alt { color: var(--blue); }
.assess__cap { font-size: 10px; color: #6E9084; margin-top: 4px; }
.assess__foot { padding: 18px 24px 20px; }
.assess__foot .btn { width: 100%; height: 46px; font-size: 13.5px; }
.assess__note { padding: 12px 24px 18px; font-size: 9.5px; color: #6E9084; line-height: 1.7; }

/* ---------- 9. 指标带 ---------- */
.stats {
  background: #04201E;
  color: var(--on-dark);
  padding: 40px 0;
}
.stats__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
}
.stat { padding: 4px 32px; border-left: 1px solid var(--line-dark); }
.stat:first-child { border-left: 0; padding-left: 0; }
.stat__num {
  font-family: var(--mono);
  font-size: clamp(30px, 3.2vw, 44px);
  font-weight: 600;
  line-height: 1.1;
  display: flex;
  align-items: baseline;
  gap: 6px;
}
.stat__num small { font-family: var(--sans); font-size: 13px; font-weight: 400; color: var(--on-dark-3); }
.stat__cap { margin-top: 10px; font-size: 11.5px; color: var(--on-dark-2); }
.stats__note { text-align: right; font-size: 9.5px; color: #5C8377; margin-top: 14px; }

/* ---------- 10. 业务卡 ---------- */
.biz { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.biz__card {
  position: relative;
  border: 1px solid var(--line);
  padding: 26px 28px 24px;
  display: flex;
  flex-direction: column;
  min-height: 380px;
  transition: border-color .2s var(--ease), transform .2s var(--ease);
}
.biz__card::before {
  content: "";
  position: absolute;
  top: -1px; left: -1px; right: -1px;
  height: 3px;
  background: var(--c, var(--brand));
}
.biz__card:hover { border-color: #C9C2AE; transform: translateY(-2px); }
.biz__idx {
  position: absolute;
  top: 26px; right: 26px;
  font-family: var(--mono);
  font-size: 54px;
  font-weight: 600;
  line-height: 1;
  color: #E6E2D6;
}
.biz__label { font-size: 10.5px; letter-spacing: .18em; color: var(--sage-text); }
.biz__title { font-size: 25px; font-weight: 600; letter-spacing: .01em; color: var(--ink); margin-top: 44px; }
.biz__desc { font-size: 13px; line-height: 1.85; color: var(--body); margin-top: 14px; min-height: 52px; }
.biz__list { margin-top: 22px; padding-top: 20px; border-top: 1px solid var(--line-2); flex: 1; }
.biz__list li {
  position: relative;
  padding-left: 16px;
  font-size: 12.5px;
  line-height: 2.4;
  color: var(--text);
}
.biz__list li::before {
  content: "";
  position: absolute;
  left: 0; top: 1.2em;
  width: 6px; height: 1px;
  background: var(--sage);
}
.biz__link { margin-top: 14px; }

/* ---------- 11. 方法（对照表） ---------- */
.method { display: grid; grid-template-columns: minmax(0, 1fr) 520px; gap: 80px; align-items: start; }
.steps { margin-top: 34px; }
.step { display: grid; grid-template-columns: 48px 1fr; gap: 0 16px; padding: 14px 0; }
.step__no { font-family: var(--mono); font-size: 11px; color: var(--sage-text); padding-top: 4px; }
.step__title { font-size: 15.5px; font-weight: 600; color: var(--ink); }
.step__desc { grid-column: 2; font-size: 11.5px; line-height: 1.85; color: var(--body); }

.compare { background: #fff; border: 1px solid var(--line); }
.compare__head { padding: 22px 24px 16px; border-bottom: 1px solid var(--line); }
.compare__title { font-size: 15.5px; font-weight: 600; color: var(--ink); letter-spacing: .02em; }
.compare__sub { font-size: 10.5px; color: var(--faint); margin-top: 4px; }
.compare__cols { display: grid; grid-template-columns: 1fr 1fr; padding: 16px 24px 14px; }
.compare__cols span { font-size: 10.5px; letter-spacing: .14em; font-weight: 500; color: var(--faint); }
.compare__cols span:last-child { color: var(--brand); }
.compare__row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border-top: 1px solid var(--line);
  margin: 0 24px;
}
.compare__row:first-of-type { margin-top: 10px; }
.compare__row div { padding: 18px 0; font-size: 12.5px; line-height: 1.7; }
.compare__row div:first-child { color: var(--muted); padding-right: 20px; }
.compare__row div:last-child { color: var(--ink); font-weight: 500; padding-left: 24px; border-left: 1px solid var(--line-2); }
.compare__foot { padding: 18px 24px 22px; font-size: 11px; color: var(--body); }

/* ---------- 12. 行业矩阵 ---------- */
.industries {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--line);
}
.industry {
  padding: 26px 28px 26px 0;
  border-bottom: 1px solid var(--line);
  position: relative;
}
.industry:nth-child(3n+2),
.industry:nth-child(3n) { padding-left: 32px; border-left: 1px solid var(--line); }
.industry__top { display: flex; align-items: flex-start; justify-content: space-between; }
.industry__icon { width: 32px; height: 32px; }
.industry__icon path, .industry__icon rect, .industry__icon circle, .industry__icon ellipse, .industry__icon line {
  fill: none; stroke: var(--brand); stroke-width: 1.5; stroke-linejoin: miter;
}
.industry__no { font-family: var(--mono); font-size: 9.5px; color: var(--sage-text); }
.industry__name {
  margin-top: 22px;
  font-size: 17px;
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--ink);
  display: flex;
  align-items: center;
  gap: 10px;
}
.badge {
  font-size: 8.5px;
  font-weight: 500;
  letter-spacing: .06em;
  color: var(--paper);
  background: var(--brand);
  padding: 2px 6px;
  flex: none;
}
.industry__desc { margin-top: 8px; font-size: 11.5px; line-height: 1.8; color: var(--body); }
.industry__link { display: inline-block; margin-top: 18px; font-size: 10.5px; letter-spacing: .06em; color: var(--brand); }
.industry__link:hover { text-decoration: underline; }

/* ---------- 13. 技术库（深色列表） ---------- */
.lib { display: grid; grid-template-columns: 400px minmax(0, 1fr); gap: 96px; }
.lib__side .h2 { color: var(--on-dark); }
.lib__desc { margin-top: 14px; font-size: 12px; line-height: 1.9; color: var(--on-dark-3); max-width: 330px; }
.chips { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; max-width: 340px; }
.chip {
  height: 36px;
  padding: 0 16px;
  border: 1px solid #2F6A60;
  color: var(--on-dark-2);
  font-size: 11.5px;
  transition: all .18s var(--ease);
}
.chip:hover { border-color: var(--on-dark-2); color: var(--on-dark); }
.chip.is-active { background: var(--paper); border-color: var(--paper); color: var(--ink); font-weight: 500; }
.lib__download { margin-top: 40px; }

.articles { border-top: 1px solid var(--line-dark); }
.article {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr) 60px;
  gap: 0 20px;
  align-items: center;
  padding: 22px 0;
  border-bottom: 1px solid var(--line-dark);
  transition: background .18s var(--ease);
}
.article:hover { background: rgba(243, 241, 234, .03); }
.article__no { font-family: var(--mono); font-size: 10.5px; color: #2F6A60; }
.article__title { font-size: 17.5px; font-weight: 600; color: var(--on-dark); letter-spacing: .01em; }
.article__meta { margin-top: 8px; font-size: 10.5px; color: var(--on-dark-3); }
.article__go { text-align: right; font-family: var(--mono); font-size: 16px; color: var(--blue); }
.lib__note { display: flex; justify-content: space-between; margin-top: 18px; font-size: 10px; color: #4F7A6E; }

/* ---------- 14. 案例 ---------- */
.cases { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.case__media {
  position: relative;
  aspect-ratio: 16 / 9;
  background: #EAF1ED;
  overflow: hidden;
}
.case__media svg { width: 100%; height: 100%; }
.case__media span {
  position: absolute;
  top: 14px; left: 16px;
  font-size: 9.5px;
  letter-spacing: .1em;
  color: #8FA79C;
}
.case__industry { margin-top: 20px; font-size: 10px; letter-spacing: .14em; color: var(--sage-text); }
.case__title { margin-top: 8px; font-size: 16.5px; font-weight: 600; color: var(--ink); }
.case__metric { margin-top: 16px; display: flex; align-items: baseline; gap: 10px; }
.case__metric b {
  font-family: var(--mono);
  font-size: 32px;
  font-weight: 600;
  color: var(--brand);
  line-height: 1;
}
.case__metric span { font-size: 10px; color: var(--muted); }
.case__foot { margin-top: 14px; padding-top: 14px; border-top: 1px solid var(--line-2); font-size: 10.5px; color: var(--body); }

/* ---------- 15. 服务网络 ---------- */
.network { display: grid; grid-template-columns: 400px minmax(0, 1fr); gap: 80px; align-items: start; }
.promise { margin-top: 32px; }
.promise li {
  font-size: 11.5px;
  line-height: 2.6;
  color: var(--text);
  padding-left: 22px;
  position: relative;
}
.promise li::before { content: "—"; position: absolute; left: 0; color: var(--sage); }
.netcard { background: #fff; border: 1px solid var(--line); }
.netcard__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 20px 24px;
  border-bottom: 1px solid var(--line);
}
.netcard__title { font-size: 15.5px; font-weight: 600; color: var(--ink); letter-spacing: .04em; }
.netcard__meta { font-size: 10.5px; color: var(--faint); }
.netcard__grid { display: grid; grid-template-columns: 1fr 1fr; }
.netcell { padding: 22px 24px; border-bottom: 1px solid var(--line-2); }
.netcell:nth-child(2n) { border-left: 1px solid var(--line-2); }
.netcell h4 { font-size: 17px; font-weight: 600; color: var(--ink); letter-spacing: .04em; }
.netcell p { margin-top: 6px; font-size: 10.5px; color: var(--brand); }
.netcell small { display: block; margin-top: 8px; font-size: 10px; color: var(--faint); }
.netcard__sla {
  background: var(--ink);
  color: var(--paper);
  padding: 18px 24px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}
.netcard__sla-label { font-size: 9.5px; letter-spacing: .18em; color: var(--on-dark-3); }
.netcard__sla-value { font-size: 13.5px; font-weight: 500; margin-top: 6px; letter-spacing: .02em; }
.netcard__sla-right { font-size: 10.5px; color: var(--on-dark-3); text-align: right; }

/* ---------- 16. 资讯 + 下载 ---------- */
.news { display: grid; grid-template-columns: minmax(0, 1fr) 360px; gap: 96px; align-items: start; }
.news__list { border-top: 1px solid var(--line); }
.news__item {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr) 90px;
  gap: 0 16px;
  align-items: center;
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
  transition: color .18s var(--ease);
}
.news__date { font-family: var(--mono); font-size: 10.5px; color: var(--sage-text); }
.news__title { font-size: 15.5px; font-weight: 600; color: var(--ink); }
.news__item:hover .news__title { color: var(--brand); }
.news__tag { text-align: right; font-size: 10px; color: var(--faint); }

.download { background: var(--ink); color: var(--paper); padding: 0 0 20px; position: relative; }
.download::before { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 4px; background: var(--blue); }
.download__head {
  display: flex; align-items: baseline; justify-content: space-between;
  padding: 22px 24px 16px; border-bottom: 1px solid var(--line-dark);
}
.download__title { font-size: 14.5px; font-weight: 600; letter-spacing: .04em; }
.download__en { font-size: 8.5px; letter-spacing: .18em; color: var(--on-dark-3); font-family: var(--mono); }
.download__item { display: block; padding: 14px 24px; border-bottom: 1px solid var(--line-dark); }
.download__item:hover { background: rgba(243, 241, 234, .04); }
.download__name { font-size: 12.5px; font-weight: 500; }
.download__meta { margin-top: 4px; font-size: 9.5px; color: var(--on-dark-3); }
.download__more { display: block; padding: 16px 24px 4px; font-size: 10.5px; color: var(--on-dark-2); }

/* ---------- 17. 底部 CTA ---------- */
.cta {
  position: relative;
  background: var(--brand);
  color: var(--on-dark);
  padding: 88px 0;
  overflow: hidden;
}
.cta__bg { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; }
.cta__inner { position: relative; }
.cta__title { font-size: clamp(32px, 3.8vw, 54px); font-weight: 700; line-height: 1.2; letter-spacing: .01em; }
.cta__sub { margin-top: 20px; font-size: 14px; color: #CFE2DC; }
.cta__actions { display: flex; align-items: center; gap: 28px; margin-top: 42px; flex-wrap: wrap; }
.cta__phone { font-size: 13px; color: #CFE2DC; }
.cta__phone b { font-family: var(--mono); font-weight: 500; color: var(--paper); }

/* ---------- 18. 页脚 ---------- */
.footer { background: var(--ink); color: var(--on-dark); padding: 72px 0 32px; overflow: hidden; }
.footer__top { display: grid; grid-template-columns: 360px repeat(4, 1fr); gap: 40px; padding-bottom: 56px; }
.footer__brand { display: flex; flex-direction: column; }
.footer__brand .brand__mark path { stroke: var(--paper); }
.footer__brand .brand__cn { color: var(--paper); }
.footer__brand .brand__en { color: var(--on-dark-3); }
.footer__addr { margin-top: 22px; font-size: 11px; line-height: 1.9; color: var(--on-dark-3); }
.footer__tel { margin-top: 16px; font-family: var(--mono); font-size: 13px; color: #CFE2DC; }
.footer__mail { margin-top: 6px; font-size: 10.5px; color: var(--on-dark-3); font-family: var(--mono); }
.footer__col h5 { font-size: 10.5px; font-weight: 500; letter-spacing: .18em; color: var(--on-dark-3); margin-bottom: 18px; }
.footer__col a { display: block; font-size: 11.5px; line-height: 2.5; color: #CFE2DC; }
.footer__col a:hover { color: var(--paper); }
.footer__rule { height: 1px; background: var(--line-dark); }
.footer__word {
  font-family: var(--mono);
  font-size: clamp(64px, 15vw, 200px);
  font-weight: 700;
  letter-spacing: .02em;
  line-height: 1;
  color: #0B3531;
  text-align: center;
  padding: 40px 0 24px;
  user-select: none;
}
.footer__bottom {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  font-size: 10px;
  color: #4A635A;
}
.footer__bottom a { color: #4A635A; }
.footer__bottom a:hover { color: var(--on-dark-2); }

/* ---------- 19. 表单 / 弹层 ---------- */
.dialog {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: rgba(7, 43, 40, .62);
}
.dialog.is-open { display: flex; }
.dialog__panel {
  width: 100%;
  max-width: 520px;
  background: #fff;
  border: 1px solid var(--line);
  max-height: 90vh;
  overflow: auto;
}
.dialog__head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 22px 24px; border-bottom: 1px solid var(--line);
}
.dialog__title { font-size: 17px; font-weight: 600; color: var(--ink); }
.dialog__close { font-size: 20px; line-height: 1; color: var(--muted); }
.dialog__body { padding: 24px; }
.field { margin-bottom: 18px; }
.field label { display: block; font-size: 11px; letter-spacing: .1em; color: var(--muted); margin-bottom: 8px; }
.field input, .field select, .field textarea {
  width: 100%;
  height: 44px;
  padding: 0 12px;
  border: 1px solid var(--line);
  background: #fff;
  font-size: 13.5px;
  color: var(--ink);
}
.field textarea { height: 88px; padding: 10px 12px; resize: vertical; line-height: 1.7; }
.field input:focus, .field select:focus, .field textarea:focus { outline: none; border-color: var(--brand); }
.field .err { display: none; margin-top: 6px; font-size: 10.5px; color: #B4483C; }
.field.is-error input, .field.is-error select, .field.is-error textarea { border-color: #B4483C; }
.field.is-error .err { display: block; }
.dialog__foot { padding: 0 24px 24px; }
.dialog__foot .btn { width: 100%; }
.form-note { font-size: 10px; color: var(--faint); line-height: 1.8; margin-top: 12px; }
.form-ok { padding: 36px 24px; text-align: center; }
.form-ok h4 { font-size: 18px; font-weight: 600; color: var(--ink); }
.form-ok p { margin-top: 10px; font-size: 12.5px; color: var(--body); line-height: 1.9; }

/* Toast */
.toast {
  position: fixed;
  left: 50%; bottom: 32px;
  transform: translate(-50%, 16px);
  background: var(--ink);
  color: var(--paper);
  font-size: 12.5px;
  padding: 12px 20px;
  opacity: 0;
  pointer-events: none;
  transition: opacity .25s var(--ease), transform .25s var(--ease);
  z-index: 120;
}
.toast.is-show { opacity: 1; transform: translate(-50%, 0); }

/* ---------- 20. 工具类 & 动效 ---------- */
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.skip-link { position: absolute; left: -9999px; top: 0; }
.skip-link:focus { left: 16px; top: 16px; z-index: 200; background: #fff; padding: 10px 16px; border: 1px solid var(--line); }

.reveal { opacity: 0; transform: translateY(16px); transition: opacity .6s var(--ease), transform .6s var(--ease); }
.reveal.is-in { opacity: 1; transform: none; }

.hide-sm { display: inline; }
@media (max-width: 720px) { .hide-sm { display: none; } }

/* ---------- 21. 响应式 ---------- */
@media (max-width: 1180px) {
  .hero__inner { grid-template-columns: minmax(0, 1fr) 400px; gap: 48px; }
  .method, .network { grid-template-columns: 1fr 460px; gap: 56px; }
  .lib { grid-template-columns: 340px minmax(0, 1fr); gap: 56px; }
  .news { grid-template-columns: minmax(0, 1fr) 320px; gap: 56px; }
  .footer__top { grid-template-columns: 300px repeat(4, 1fr); gap: 28px; }
}

@media (max-width: 1024px) {
  :root { --section-y: 64px; }
  .nav, .header__search { display: none; }
  .burger { display: flex; }
  .hero__inner { grid-template-columns: minmax(0, 1fr); gap: 48px; }
  .hero { padding: 72px 0 56px; }
  .assess { max-width: 520px; }
  .method, .network, .lib, .news { grid-template-columns: 1fr; gap: 40px; }
  .biz, .cases { grid-template-columns: 1fr; }
  .industries { grid-template-columns: repeat(2, 1fr); }
  .industry:nth-child(3n+2), .industry:nth-child(3n) { padding-left: 0; border-left: 0; }
  .industry:nth-child(2n) { padding-left: 28px; border-left: 1px solid var(--line); }
  .stats__grid { grid-template-columns: repeat(2, 1fr); gap: 28px 0; }
  .stat:nth-child(3) { border-left: 0; padding-left: 0; }
  .footer__top { grid-template-columns: 1fr 1fr; gap: 36px; }
  .sec-head { flex-direction: column; align-items: flex-start; gap: 18px; }
  .sec-head__aside { max-width: 100%; }
}

@media (max-width: 720px) {
  :root { --section-y: 52px; --gutter: 18px; }
  body { font-size: 14px; }
  .utility__left { display: none; }
  .utility__inner { justify-content: flex-end; }
  .header__inner { height: 66px; gap: 16px; }
  .brand__mark { width: 32px; height: 32px; }
  .brand__cn { font-size: 17px; }
  .header__actions .btn { display: none; }
  .h1 { font-size: 34px; }
  .hero__sector { flex-direction: column; align-items: flex-start; gap: 8px; margin-top: 44px; }
  .hero__sector span { max-width: 100%; line-height: 1.9; }
  .hero__bg { display: none; }   /* 窄屏隐藏栅格，避免竖线穿过标题 */
  .stats__grid { grid-template-columns: 1fr 1fr; }
  .stat { padding: 0 16px; }
  .stat__num { font-size: 28px; }
  .industries { grid-template-columns: 1fr; }
  .industry, .industry:nth-child(2n) { padding-left: 0; border-left: 0; }
  .compare__row div:last-child { padding-left: 16px; }
  .news__item { grid-template-columns: 80px minmax(0, 1fr); }
  .news__tag { display: none; }
  .article { grid-template-columns: 32px minmax(0, 1fr) 40px; }
  .article__title { font-size: 15.5px; }
  .footer__top { grid-template-columns: 1fr; }
  .footer__word { padding: 28px 0 16px; }
  .footer__bottom { flex-direction: column; gap: 8px; }
  .cta { padding: 60px 0; }
  .biz__card { min-height: auto; }
}

/* 移动端抽屉 */
.mdrawer {
  position: fixed;
  inset: 0;
  z-index: 90;
  background: #fff;
  transform: translateX(100%);
  visibility: hidden;
  transition: transform .3s var(--ease), visibility .3s;
  display: flex;
  flex-direction: column;
  padding: 20px var(--gutter) 32px;
  overflow: auto;
}
.mdrawer.is-open { transform: none; visibility: visible; }
.mdrawer__head { display: flex; align-items: center; justify-content: space-between; padding-bottom: 16px; border-bottom: 1px solid var(--line); }
.mdrawer__close { font-size: 24px; color: var(--muted); }
.mdrawer nav { margin-top: 8px; }
.mdrawer nav a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 0;
  border-bottom: 1px solid var(--line-2);
  font-size: 16px;
  font-weight: 500;
  color: var(--ink);
}
.mdrawer .btn { margin-top: 24px; width: 100%; }
.mdrawer__contact { margin-top: 20px; font-size: 11.5px; color: var(--muted); line-height: 2; }