/* ============================================================
   文途数据 · 官网视觉系统 v2
   方向：数据基础设施 / 工程控制台
   原则：冷色高精度、深色首屏承载产品界面、内容表格化、非对称标尺栏；
        不用渐变光晕、卡片阴影堆叠与装饰性动效建立「科技感」。
   ============================================================ */

:root {
  --bg: #ffffff;
  --bg-soft: #f7f9fb;
  --bg-rail: #eef2f6;
  --ink: #0b1118;
  --ink-2: #2b3642;
  --muted: #5f6d7b;
  --faint: #8b98a6;
  --line: #dce3ea;
  --line-soft: #e9eef3;
  --line-strong: #b8c4d0;
  --signal: #d5452a;
  --signal-deep: #ad3520;
  --signal-soft: #fbece8;
  --night: #080d14;
  --night-2: #0e1621;
  --night-3: #141f2c;
  --night-line: #233241;
  --night-text: #e7eef5;
  --night-muted: #8a9aab;
  --ok: #46c98b;
  --wrap: 1320px;
  --font-cn: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", "Source Han Sans SC", sans-serif;
  --font-num: "Bahnschrift", "DIN Alternate", "Arial Narrow", var(--font-cn);
  --font-mono: ui-monospace, "SFMono-Regular", "JetBrains Mono", "Cascadia Mono", Consolas, "Liberation Mono", monospace;
  --ease: cubic-bezier(.2, .7, .3, 1);
}

*, *::before, *::after { box-sizing: border-box; }
/* clip 不会创建滚动容器，sticky 页头在 PC / H5 均可正常工作；
   hidden 作为旧版 WebView 的回退，避免不支持 clip 时出现横向滚动。 */
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; overflow-x: clip; }
body {
  margin: 0;
  overflow-x: hidden;
  overflow-x: clip;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-cn);
  font-size: 15px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
img, svg { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; color: inherit; }
h1, h2, h3, h4 { margin: 0; font-weight: 700; letter-spacing: -.018em; line-height: 1.3; }
p { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
::selection { background: var(--signal); color: #fff; }
:focus-visible { outline: 2px solid var(--signal); outline-offset: 3px; }

/* 刘海屏 / 横屏安全区：桌面 env 为 0，不改变既有版心 */
.wrap { width: min(100%, var(--wrap)); margin-inline: auto; padding-inline: clamp(20px, 4vw, 56px); }
.wrap {
  padding-left: max(clamp(20px, 4vw, 56px), env(safe-area-inset-left));
  padding-right: max(clamp(20px, 4vw, 56px), env(safe-area-inset-right));
}
[id] { scroll-margin-top: 78px; }
/* 用 1px 裁剪而不是 left:-9999px 离屏，避免产生真实的越界元素 */
.skip-link {
  position: fixed; left: 8px; top: -60px; z-index: 999;
  width: 1px; height: 1px; padding: 0; margin: 0; overflow: hidden;
  clip: rect(0 0 0 0); clip-path: inset(50%); white-space: nowrap;
  background: var(--ink); color: #fff;
}
.skip-link:focus {
  top: 12px; left: 12px; width: auto; height: auto;
  padding: 12px 20px; clip: auto; clip-path: none; overflow: visible;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .13em;
  text-transform: uppercase;
  color: var(--muted);
  display: block;
  line-height: 1.6;
  overflow-wrap: anywhere;
}
.eyebrow-num { color: var(--signal); font-weight: 700; margin-right: 8px; }

/* ---------------- 按钮 ---------------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  padding: 10px 18px; border: 1px solid var(--ink); background: transparent;
  border-radius: 2px;
  font-size: 13px; font-weight: 600; letter-spacing: .01em; cursor: pointer;
  transition: background .2s var(--ease), color .2s var(--ease), border-color .2s var(--ease);
  white-space: nowrap;
}
.btn-primary { background: var(--ink); color: #fff; }
.btn-primary:hover { background: var(--signal); border-color: var(--signal); }
.btn-ghost:hover { background: var(--ink); color: #fff; }
.btn-invert { background: #fff; color: var(--ink); border-color: #fff; }
.btn-invert:hover { background: var(--signal); color: #fff; border-color: var(--signal); }
.btn-block { width: 100%; }
.text-link {
  display: inline-flex; align-items: center; gap: 8px; margin-top: 26px;
  font-size: 12.5px; font-weight: 600; padding-bottom: 4px;
  border-bottom: 1px solid var(--line-strong); transition: color .2s, border-color .2s;
}
.text-link:hover { color: var(--signal); border-color: var(--signal); }

/* ---------------- 系统状态栏 + 页头 ---------------- */
.utility-bar { background: var(--night); border-bottom: 1px solid var(--night-line); }
.utility-inner {
  display: flex; align-items: center; gap: 22px; height: 30px;
  font-family: var(--font-mono); font-size: 10px; letter-spacing: .09em;
  color: var(--night-muted); text-transform: uppercase; white-space: nowrap;
  overflow: hidden;
}
.utility-inner .util-status { color: var(--night-text); display: inline-flex; align-items: center; gap: 7px; }
.utility-inner .util-status i { width: 6px; height: 6px; background: var(--ok); display: block; flex-shrink: 0; }
.utility-inner .util-spacer { flex: 1; }
.utility-inner .util-divider { width: 1px; height: 12px; background: var(--night-line); flex-shrink: 0; }

.site-header {
  position: sticky; top: 0; z-index: 60;
  background: rgba(255, 255, 255, .96);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--line);
}
.header-inner { display: flex; align-items: center; gap: clamp(18px, 3vw, 40px); height: 62px; }
.brand { display: flex; align-items: center; gap: 10px; flex-shrink: 0; margin-right: auto; }
.brand-mark {
  position: relative; width: 25px; height: 25px; display: block;
  border: 1.5px solid var(--signal); flex-shrink: 0;
}
.brand-mark span { position: absolute; width: 5px; height: 5px; background: #fff; }
.brand-mark span:nth-child(1) { left: -1.5px; top: -1.5px; border-right: 1.5px solid var(--signal); border-bottom: 1.5px solid var(--signal); }
.brand-mark span:nth-child(2) { right: -1.5px; top: -1.5px; border-left: 1.5px solid var(--signal); border-bottom: 1.5px solid var(--signal); }
.brand-mark span:nth-child(3) { left: -1.5px; bottom: -1.5px; border-right: 1.5px solid var(--signal); border-top: 1.5px solid var(--signal); }
.brand-mark span:nth-child(4) { right: -1.5px; bottom: -1.5px; border-left: 1.5px solid var(--signal); border-top: 1.5px solid var(--signal); }
.brand-mark::after { content: ""; position: absolute; left: 9px; top: 9px; width: 5px; height: 5px; border-radius: 50%; background: var(--signal); }
.brand-text { display: flex; flex-direction: column; line-height: 1.3; }
.brand-text strong { font-size: 15px; letter-spacing: .05em; font-weight: 700; }
.brand-text small { font-size: 9.5px; color: var(--faint); letter-spacing: .01em; }
.nav { display: flex; align-items: center; gap: clamp(14px, 2vw, 28px); }
.nav-link { font-size: 13px; font-weight: 500; color: var(--ink-2); position: relative; padding: 6px 0; white-space: nowrap; }
.nav-link::after { content: ""; position: absolute; left: 0; bottom: 0; width: 0; height: 1px; background: var(--signal); transition: width .25s var(--ease); }
.nav-link:hover::after, .nav-link.is-active::after { width: 100%; }
.nav-link.is-active { color: var(--ink); font-weight: 700; }
.header-cta { font-size: 12px; font-weight: 600; background: var(--ink); color: #fff; padding: 8px 14px; white-space: nowrap; border-radius: 2px; transition: background .2s; }
.header-cta:hover { background: var(--signal); }
/* 44×44 是 iOS / Android 推荐的最小触控区 */
.nav-toggle { display: none; width: 44px; height: 44px; border: 1px solid var(--line); background: transparent; cursor: pointer; padding: 13px 10px; border-radius: 2px; flex-shrink: 0; }
.nav-toggle span { display: block; height: 1.5px; background: var(--ink); margin: 5px 0; transition: transform .2s var(--ease); }
.nav-toggle[aria-expanded="true"] span:first-child { transform: translateY(3.25px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:last-child { transform: translateY(-3.25px) rotate(-45deg); }
.mobile-nav { display: none; }
.mobile-nav a { display: flex; align-items: center; min-height: 48px; padding: 12px 0; border-bottom: 1px solid var(--line-soft); font-weight: 600; font-size: 14px; }

/* ---------------- 首页 Hero（深色产品区） ---------------- */
.hero {
  position: relative;
  background: var(--night);
  color: var(--night-text);
  border-bottom: 1px solid var(--night-line);
  isolation: isolate;
}
.hero::before {
  content: ""; position: absolute; inset: 0; z-index: -1; pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(140, 175, 210, .07) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(140, 175, 210, .07) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: linear-gradient(to bottom right, #000 0%, rgba(0,0,0,.35) 65%, transparent 100%);
  mask-image: linear-gradient(to bottom right, #000 0%, rgba(0,0,0,.35) 65%, transparent 100%);
}
.hero-grid {
  display: grid; grid-template-columns: minmax(0, 1.02fr) minmax(0, 1fr);
  gap: clamp(40px, 5vw, 76px); align-items: center;
  padding-block: clamp(56px, 6vw, 88px);
}
.hero-grid > * { min-width: 0; }
.hero-copy .eyebrow { color: var(--night-muted); }
.hero-copy .eyebrow-num { color: #f07657; }
.hero-copy h1 {
  font-size: clamp(2.25rem, 3.85vw, 3.55rem);
  margin: 22px 0 20px; line-height: 1.26; font-weight: 700; color: #fff;
  letter-spacing: -.022em;
}
.mark {
  white-space: nowrap;
  text-decoration: underline;
  text-decoration-color: var(--signal);
  text-decoration-thickness: 2px;
  text-underline-offset: .16em;
}
.hero-lede { max-width: 520px; font-size: 14px; line-height: 1.85; color: #a8b7c6; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 26px; }
.hero .btn-primary { background: #fff; border-color: #fff; color: var(--night); }
.hero .btn-primary:hover { background: var(--signal); border-color: var(--signal); color: #fff; }
.hero .btn-ghost { border-color: var(--night-line); color: var(--night-text); }
.hero .btn-ghost:hover { background: var(--night-3); border-color: var(--night-line); }
.hero-note {
  margin-top: 30px; padding-top: 16px; border-top: 1px solid var(--night-line);
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
  font-family: var(--font-mono); font-size: 10.5px; letter-spacing: .035em;
  color: var(--night-muted);
}
.status-dot { width: 6px; height: 6px; background: var(--ok); flex-shrink: 0; }

/* 产品控制台 */
.hero-board {
  background: var(--night-2);
  border: 1px solid var(--night-line);
  box-shadow: 0 28px 70px rgba(0, 0, 0, .45);
  font-family: var(--font-mono);
  overflow: hidden;
}
.board-head {
  display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap;
  padding: 0 14px; height: 34px; border-bottom: 1px solid var(--night-line);
  font-size: 9.5px; letter-spacing: .1em; color: var(--night-muted); text-transform: uppercase;
}
.board-head > span { min-width: 0; overflow-wrap: anywhere; }
.board-live { color: var(--night-text); display: inline-flex; align-items: center; gap: 7px; }
.board-live i { width: 6px; height: 6px; background: var(--ok); display: block; }
.board-svg { width: 100%; display: block; background: var(--night-2); }
.board-foot { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--night-line); background: var(--night-3); }
.board-foot > div { padding: 13px 16px; border-right: 1px solid var(--night-line); }
.board-foot > div:last-child { border-right: 0; }
.board-foot span { display: block; font-size: 9.5px; color: var(--night-muted); letter-spacing: .05em; }
.board-foot strong { display: block; font-family: var(--font-num); font-size: 20px; font-variant-numeric: tabular-nums; margin-top: 3px; letter-spacing: .01em; color: #fff; }

/* 能力索引条 */
.hero-ticker { border-top: 1px solid var(--night-line); background: rgba(8, 13, 20, .72); }
.ticker-inner { display: flex; align-items: center; gap: clamp(12px, 2vw, 28px); padding-block: 13px; flex-wrap: wrap; }
.ticker-inner > span:first-child {
  font-family: var(--font-mono); font-size: 9.5px; letter-spacing: .13em;
  color: var(--night-muted); text-transform: uppercase; padding-right: 16px; border-right: 1px solid var(--night-line);
}
.ticker-inner a { font-size: 12px; font-weight: 500; color: #b9c7d5; transition: color .2s; }
.ticker-inner a:hover { color: #fff; }
.ticker-end { margin-left: auto; font-size: 11px; color: var(--night-muted); font-family: var(--font-mono); }

/* ---------------- 通用区块：左标尺 + 右内容 ---------------- */
.section { padding-block: clamp(54px, 5.5vw, 82px); border-bottom: 1px solid var(--line); }
.section-alt { background: var(--bg-soft); }
.section-head {
  display: grid;
  grid-template-columns: 190px minmax(0, 1fr);
  column-gap: clamp(24px, 4vw, 60px);
  align-items: start;
  margin-bottom: clamp(26px, 3vw, 40px);
  padding-bottom: 24px;
  border-bottom: 1px solid var(--line);
}
.section-head .eyebrow {
  grid-column: 1; grid-row: 1 / span 2;
  padding: 2px 0 0 13px; border-left: 2px solid var(--signal);
  font-size: 10px; line-height: 1.5;
}
.section-head .eyebrow-num {
  display: block; margin: 0 0 7px; font-family: var(--font-num);
  font-size: 27px; line-height: 1; letter-spacing: -.02em; color: var(--ink);
}
.section-head .eyebrow-num.is-rule {
  display: block; width: 20px; height: 2px; margin: 9px 0 13px;
  padding: 0; background: var(--signal); font-size: 0; line-height: 0;
}
.section-title { grid-column: 2; font-size: clamp(1.6rem, 2.5vw, 2.3rem); line-height: 1.32; }
.section-lede { grid-column: 2; margin-top: 10px; max-width: 760px; color: var(--muted); font-size: 13.5px; line-height: 1.8; }

/* 服务清单：表格化行 */
.svc-list { border-top: 1px solid var(--ink); }
.svc-row {
  display: grid; grid-template-columns: 66px minmax(0, 292px) minmax(0, 1fr);
  gap: clamp(16px, 2.6vw, 36px); align-items: start;
  padding: 19px 8px; border-bottom: 1px solid var(--line-soft);
  transition: background .2s var(--ease);
}
.svc-row:hover { background: var(--bg-soft); }
.svc-code { font-family: var(--font-mono); font-size: 10.5px; letter-spacing: .06em; color: var(--signal); padding-top: 5px; }
.svc-main h3 { font-size: 17px; line-height: 1.4; }
.svc-main p { margin-top: 4px; color: var(--muted); font-size: 12.5px; line-height: 1.7; }
.svc-items { display: flex; flex-wrap: wrap; gap: 5px; padding-top: 3px; }
.svc-items li {
  font-family: var(--font-mono); font-size: 10.5px; color: var(--ink-2);
  border: 1px solid var(--line); padding: 3px 8px; background: var(--bg); letter-spacing: .01em;
}

/* 流程：横向流水线 */
.flow { display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); border: 1px solid var(--line); background: var(--bg); }
.flow-step { padding: 20px 16px 24px; border-right: 1px solid var(--line-soft); position: relative; }
.flow-step:last-child { border-right: 0; }
.flow-step::before { content: ""; position: absolute; top: -1px; left: -1px; right: -1px; height: 2px; background: var(--line); transition: background .25s var(--ease); }
.flow-step:hover::before { background: var(--signal); }
.flow-step::after {
  content: ""; position: absolute; top: 30px; right: -4px; width: 7px; height: 7px;
  border-top: 1px solid var(--line-strong); border-right: 1px solid var(--line-strong);
  transform: rotate(45deg); background: var(--bg); z-index: 1;
}
.flow-step:last-child::after { display: none; }
.flow-n { font-family: var(--font-mono); font-size: 10.5px; font-weight: 700; color: var(--signal); font-variant-numeric: tabular-nums; display: block; line-height: 1; letter-spacing: .08em; }
.flow-step h3 { font-size: 14px; margin-top: 15px; }
.flow-step p { font-size: 11.5px; color: var(--muted); line-height: 1.7; margin-top: 6px; }

/* 质量数据带：终端风 */
.quality-band {
  position: relative; isolation: isolate;
  background: var(--night); color: var(--night-text);
  padding-block: clamp(54px, 6vw, 80px);
}
.quality-band::before {
  content: ""; position: absolute; inset: 0; z-index: -1; pointer-events: none;
  background-image: linear-gradient(to right, rgba(140, 175, 210, .055) 1px, transparent 1px);
  background-size: 72px 100%;
}
.quality-band .eyebrow { color: var(--night-muted); }
.quality-band .eyebrow-num { color: #f07657; }
.quality-band > .wrap { display: grid; grid-template-columns: minmax(0, .82fr) minmax(0, 1.18fr); gap: clamp(36px, 5vw, 72px); align-items: center; }
.quality-head h2 { font-size: clamp(1.6rem, 2.5vw, 2.15rem); margin: 16px 0 14px; line-height: 1.35; color: #fff; }
.quality-head > p:not(.eyebrow) { color: var(--night-muted); font-size: 13px; line-height: 1.85; max-width: 420px; }
.quality-head .btn { margin-top: 24px; background: transparent; border-color: var(--night-line); color: var(--night-text); }
.quality-head .btn:hover { background: #fff; border-color: #fff; color: var(--night); }
.metrics { display: grid; grid-template-columns: repeat(2, 1fr); border-top: 1px solid var(--night-line); border-left: 1px solid var(--night-line); }
.metric { padding: clamp(18px, 2.2vw, 28px); border-right: 1px solid var(--night-line); border-bottom: 1px solid var(--night-line); background: rgba(14, 22, 33, .55); }
.metric-label { font-size: 11px; color: var(--night-muted); letter-spacing: .04em; }
.metric-value { display: flex; align-items: baseline; gap: 5px; margin: 8px 0 6px; }
.metric-value strong { font-family: var(--font-num); font-size: clamp(34px, 3.8vw, 50px); font-weight: 700; line-height: 1; font-variant-numeric: tabular-nums; letter-spacing: -.02em; color: #fff; }
.metric-value span { font-size: 14px; color: #f07657; font-weight: 700; }
.metric-note { font-size: 10.5px; color: #6f808f; font-family: var(--font-mono); letter-spacing: .02em; }
.quality-band-compact > .wrap { grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr); }

/* 案例 / 文章：改为高密度索引行 */
.mini-grid { display: block; border-top: 1px solid var(--ink); }
.mini-grid-3 { display: block; }
.mini-case, .mini-article {
  display: grid;
  grid-template-columns: 178px minmax(0, 1fr) minmax(0, 1.04fr) 108px;
  gap: clamp(14px, 2vw, 28px); align-items: baseline;
  padding: 19px 8px; min-height: 0;
  border-bottom: 1px solid var(--line-soft);
  transition: background .2s var(--ease);
}
.mini-case:hover, .mini-article:hover { background: var(--bg-soft); }
.mini-meta { font-family: var(--font-mono); font-size: 10px; letter-spacing: .04em; color: var(--signal); text-transform: uppercase; line-height: 1.6; }
.mini-case h3, .mini-article h3 { font-size: 15.5px; margin: 0; line-height: 1.5; font-weight: 700; }
.mini-case p, .mini-article p { font-size: 12.5px; color: var(--muted); line-height: 1.75; margin: 0; }
.mini-more {
  margin: 0; padding: 0; justify-self: end; font-size: 11px; font-weight: 600;
  display: inline-flex; gap: 6px; align-items: center; color: var(--muted); white-space: nowrap;
}
.mini-case:hover .mini-more, .mini-article:hover .mini-more { color: var(--signal); }

/* FAQ */
.faq-grid { display: grid; grid-template-columns: 296px minmax(0, 1fr); gap: clamp(32px, 5vw, 72px); align-items: start; }
.faq-grid > div:first-child { position: sticky; top: 90px; }
.faq-grid .section-head { display: block; border-bottom: 0; padding-bottom: 0; margin-bottom: 0; }
.faq-grid .section-head .eyebrow { border-left: 0; padding-left: 0; display: block; }
.faq-grid .section-head .eyebrow-num { font-size: 22px; }
.faq-grid .section-title { font-size: 1.55rem; }
.faq-grid .section-lede { font-size: 13px; }
.faq-grid .btn { margin-top: 22px; }
.faq-list { border-top: 1px solid var(--ink); }
.faq-item { border-bottom: 1px solid var(--line-soft); }
.faq-item summary { display: flex; align-items: center; gap: 16px; padding: 16px 4px; cursor: pointer; font-weight: 600; font-size: 14px; list-style: none; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-n { font-family: var(--font-mono); font-size: 10.5px; color: var(--signal); flex-shrink: 0; }
.faq-toggle { margin-left: auto; font-size: 17px; font-weight: 400; color: var(--faint); transition: transform .25s var(--ease), color .25s; }
.faq-item[open] .faq-toggle { transform: rotate(45deg); color: var(--signal); }
.faq-a { padding: 0 0 18px 42px; font-size: 13px; color: var(--ink-2); line-height: 1.85; max-width: 760px; }

/* CTA */
.cta-band { background: var(--night-2); color: #fff; padding-block: clamp(48px, 5.5vw, 70px); border-top: 1px solid var(--night-line); }
.cta-band .eyebrow { color: var(--night-muted); border-left: 2px solid var(--signal); padding-left: 12px; display: inline-block; }
.cta-inner { display: flex; align-items: center; justify-content: space-between; gap: 32px; flex-wrap: wrap; }
.cta-inner h2 { font-size: clamp(1.6rem, 2.6vw, 2.25rem); margin: 14px 0 10px; line-height: 1.35; }
.cta-inner p:not(.eyebrow) { color: var(--night-muted); font-size: 13.5px; max-width: 640px; }
.cta-band .btn-invert { background: #fff; color: var(--night); border-color: #fff; }
.cta-band .btn-invert:hover { background: var(--signal); color: #fff; border-color: var(--signal); }

/* ---------------- 内页页头 ---------------- */
.page-head {
  padding-block: clamp(38px, 4.5vw, 58px) clamp(34px, 4vw, 50px);
  border-bottom: 1px solid var(--line); background: var(--bg-soft);
}
.page-head h1 { font-size: clamp(1.85rem, 3.1vw, 2.8rem); margin: 14px 0 12px; line-height: 1.32; }
.page-lede { max-width: 780px; color: var(--ink-2); font-size: 13.5px; line-height: 1.8; }
.crumbs { margin-bottom: 22px; }
.crumbs ol { display: flex; flex-wrap: wrap; align-items: center; gap: 9px; font-size: 11.5px; color: var(--faint); font-family: var(--font-mono); }
.crumbs a:hover { color: var(--signal); }
.crumb-sep { margin-left: 9px; color: var(--line-strong); }

/* 散文内容 */
.prose-cols { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: clamp(36px, 5vw, 72px); }
.prose-cols p { margin-bottom: 18px; color: var(--ink-2); line-height: 1.9; font-size: 14px; }
.prose-cols .drop { font-size: 17px; font-weight: 700; color: var(--ink); line-height: 1.7; }
.prose { max-width: 760px; font-size: 14.5px; color: var(--ink-2); line-height: 1.9; }
.prose h2 { font-size: 20px; color: var(--ink); margin: 38px 0 14px; padding-left: 14px; border-left: 2px solid var(--signal); }
.prose h2:first-child { margin-top: 0; }
.prose p { margin-bottom: 18px; }
.prose-note { font-size: 12px; color: var(--muted); border-top: 1px solid var(--line); padding-top: 16px; }

/* 三承诺 / 行业方案：细线表格，不用卡片阴影 */
.pillars { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1px; background: var(--line); border: 1px solid var(--line); }
.pillar { background: var(--bg-soft); padding: clamp(22px, 2.6vw, 32px); }
.pillar-n { font-family: var(--font-num); font-size: 30px; color: var(--line-strong); font-weight: 700; line-height: 1; display: block; }
.pillar h3 { font-size: 17px; margin: 16px 0 10px; }
.pillar p { font-size: 13px; color: var(--ink-2); line-height: 1.8; }
.solution-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1px; background: var(--line); border: 1px solid var(--line); }
.solution { background: var(--bg-soft); padding: clamp(22px, 2.5vw, 32px); transition: background .2s var(--ease); }
.solution:hover { background: var(--bg); }
.solution-code { font-family: var(--font-mono); font-size: 10.5px; color: var(--signal); letter-spacing: .08em; }
.solution h3 { font-size: 18px; margin: 18px 0 8px; }
.solution > p { font-size: 12.5px; color: var(--muted); line-height: 1.75; min-height: 44px; }
.tag-row { display: flex; flex-wrap: wrap; gap: 5px; margin-top: 14px; }
.tag { font-family: var(--font-mono); font-size: 10.5px; border: 1px solid var(--line); padding: 3px 8px; color: var(--ink-2); background: var(--bg); }

/* 规格表 */
.spec-table { border-top: 1px solid var(--ink); }
.spec-row { display: grid; grid-template-columns: 200px minmax(0, 1.2fr) minmax(0, .8fr); gap: 24px; padding: 16px 4px; border-bottom: 1px solid var(--line-soft); font-size: 13.5px; color: var(--ink-2); align-items: start; }
.spec-row:hover { background: var(--bg-soft); }
.spec-row span:first-child { font-weight: 700; color: var(--ink); }
.spec-head { font-size: 10px; letter-spacing: .1em; color: var(--faint); font-family: var(--font-mono); text-transform: uppercase; background: var(--bg-rail); }
.spec-head span:first-child { color: var(--faint); font-weight: 400; }

/* 案例列表 */
.list-head { display: flex; justify-content: space-between; font-family: var(--font-mono); font-size: 10px; letter-spacing: .1em; color: var(--faint); padding-bottom: 12px; text-transform: uppercase; }
.case-list, .article-list { border-top: 1px solid var(--ink); }
.case-row {
  display: grid; grid-template-columns: 170px minmax(0, 1fr) 210px 24px; gap: clamp(16px, 3vw, 40px);
  padding: 24px 6px; border-bottom: 1px solid var(--line-soft); align-items: start; transition: background .2s var(--ease);
}
.case-row:hover, .article-row:hover { background: var(--bg-soft); }
.case-no { font-family: var(--font-mono); font-size: 10.5px; letter-spacing: .06em; color: var(--signal); padding-top: 4px; }
.case-main { display: flex; flex-direction: column; gap: 7px; }
.case-main strong { font-size: clamp(17px, 1.65vw, 21px); line-height: 1.45; font-weight: 700; }
.case-client { font-size: 11.5px; color: var(--faint); font-family: var(--font-mono); }
.case-challenge { font-size: 12.5px; color: var(--ink-2); line-height: 1.75; }
.case-figures { display: flex; flex-direction: column; gap: 12px; }
.case-figures span { display: block; border-left: 2px solid var(--line); padding-left: 11px; }
.case-figures em { display: block; font-style: normal; font-size: 10.5px; color: var(--faint); }
.case-figures b { font-family: var(--font-num); font-size: 18px; font-variant-numeric: tabular-nums; }
.article-arrow { font-size: 17px; color: var(--faint); align-self: center; transition: color .2s; }
.case-row:hover .article-arrow, .article-row:hover .article-arrow { color: var(--signal); }

.industry-strip { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1px; background: var(--line); border: 1px solid var(--line); }
.industry-strip a { background: var(--bg-soft); padding: 20px 24px; display: flex; flex-direction: column; gap: 5px; transition: background .2s; }
.industry-strip a:hover { background: var(--bg); }
.industry-strip strong { font-size: 16px; }
.industry-strip span { font-size: 11.5px; color: var(--muted); }

/* 文章列表 */
.filter-bar { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; padding-bottom: 22px; }
.filter-btn { border: 1px solid var(--line); background: transparent; padding: 6px 13px; font-size: 12px; cursor: pointer; border-radius: 2px; transition: background .2s, color .2s, border-color .2s; }
.filter-btn:hover { border-color: var(--ink); }
.filter-btn.is-active { background: var(--ink); color: #fff; border-color: var(--ink); }
.filter-count { margin-left: auto; font-size: 11.5px; color: var(--faint); font-family: var(--font-mono); }
.article-row {
  display: grid; grid-template-columns: 54px minmax(0, 1fr) 24px; gap: clamp(14px, 3vw, 34px);
  padding: 22px 6px; border-bottom: 1px solid var(--line-soft); align-items: start; transition: background .2s var(--ease);
}
.article-no { font-family: var(--font-num); font-size: 22px; color: var(--line-strong); font-weight: 700; line-height: 1.2; }
.article-row:hover .article-no { color: var(--signal); }
.article-body { display: flex; flex-direction: column; gap: 7px; }
.article-meta { font-family: var(--font-mono); font-size: 10.5px; letter-spacing: .04em; color: var(--faint); }
.article-body strong { font-size: clamp(17px, 1.7vw, 21px); line-height: 1.45; font-weight: 700; }
.article-summary { font-size: 12.5px; color: var(--ink-2); line-height: 1.75; max-width: 820px; }
.filter-empty, .empty { padding: 36px 6px; color: var(--muted); font-size: 13px; }

/* 详情页 */
.detail { padding-block: clamp(26px, 3vw, 42px) clamp(60px, 7vw, 96px); }
.detail-head { padding-block: clamp(26px, 3.5vw, 46px) clamp(30px, 4vw, 48px); border-bottom: 1px solid var(--line); }
.detail-head h1 { font-size: clamp(1.8rem, 3.2vw, 2.85rem); margin: 16px 0 16px; max-width: 960px; line-height: 1.35; }
.detail-summary { font-size: 14.5px; color: var(--ink-2); max-width: 780px; line-height: 1.85; }
.detail-grid { display: grid; grid-template-columns: minmax(0, 1fr) 268px; gap: clamp(32px, 5vw, 72px); padding-top: clamp(32px, 4vw, 54px); }
.detail-aside { border-top: 2px solid var(--ink); padding-top: 18px; height: fit-content; position: sticky; top: 84px; background: var(--bg-soft); padding: 20px; }
.detail-aside .eyebrow { margin-bottom: 12px; }
.aside-title { font-size: 17px; font-weight: 700; margin-bottom: 8px; }
.detail-aside > p:not(.eyebrow):not(.aside-title) { font-size: 12.5px; color: var(--muted); line-height: 1.8; margin-bottom: 14px; }
.detail-aside .btn { width: 100%; margin-top: 8px; }
.aside-line { height: 1px; background: var(--line); margin: 22px 0; }
.case-metrics { display: grid; grid-template-columns: repeat(3, 1fr); border: 1px solid var(--line); background: var(--bg-soft); margin-top: 32px; }
.case-metric { padding: 20px 24px; border-right: 1px solid var(--line); }
.case-metric:last-child { border-right: 0; }
.case-metric span { display: block; font-size: 10.5px; color: var(--muted); font-family: var(--font-mono); }
.case-metric strong { font-family: var(--font-num); font-size: 26px; font-variant-numeric: tabular-nums; display: block; margin-top: 5px; }
.related { margin-top: clamp(50px, 6vw, 84px); }
.related .section-head { margin-bottom: 20px; }
.related-list { border-top: 1px solid var(--ink); }
.related-list a { display: grid; grid-template-columns: 120px minmax(0, 1fr) 20px; gap: 20px; align-items: center; padding: 16px 4px; border-bottom: 1px solid var(--line-soft); transition: background .2s; }
.related-list a:hover { background: var(--bg-soft); }
.related-date { font-family: var(--font-mono); font-size: 10.5px; color: var(--faint); }
.related-list strong { font-size: 14.5px; font-weight: 600; }
.related-arrow { color: var(--faint); }

/* 联系页 */
.contact-grid { display: grid; grid-template-columns: minmax(0, .85fr) minmax(0, 1.15fr); gap: clamp(36px, 5vw, 72px); align-items: start; }
.contact-line { display: flex; justify-content: space-between; gap: 20px; padding: 14px 0; border-bottom: 1px solid var(--line-soft); font-size: 13.5px; }
.contact-line > span { color: var(--muted); font-size: 12.5px; }
.contact-line a:hover { color: var(--signal); }
.contact-info > .eyebrow { margin-bottom: 12px; }
.contact-note { margin-top: 32px; background: var(--bg-soft); padding: 22px; border-top: 2px solid var(--ink); }
.contact-note h3 { font-size: 15px; margin-bottom: 12px; }
.contact-note li { font-size: 12.5px; color: var(--ink-2); line-height: 1.7; padding: 6px 0; }
.contact-hint { margin-top: 18px; font-size: 11.5px; color: var(--muted); line-height: 1.8; }
.contact-form-wrap { background: var(--bg); border: 1px solid var(--line); padding: clamp(24px, 3vw, 40px); }
.contact-form-wrap h2 { font-size: 22px; }
.form-lede { font-size: 12.5px; color: var(--muted); margin: 8px 0 26px; }
.req { color: var(--signal); }
.form-row { margin-bottom: 17px; }
.form-row label { display: block; font-size: 12.5px; font-weight: 600; margin-bottom: 7px; }
.form-row input, .form-row select, .form-row textarea {
  width: 100%; background: var(--bg-soft); border: 1px solid var(--line);
  padding: 10px 12px; font-size: 13.5px; border-radius: 2px; transition: border-color .2s, background .2s;
}
.form-row textarea { resize: vertical; min-height: 110px; }
.form-row input:focus, .form-row select:focus, .form-row textarea:focus { outline: none; border-color: var(--signal); background: var(--bg); box-shadow: 0 0 0 2px var(--signal-soft); }
.form-row input::placeholder, .form-row textarea::placeholder { color: var(--faint); }
.form-2col { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.form-check { display: flex; align-items: flex-start; gap: 9px; margin: 4px 0 18px; }
.form-check input { margin-top: 4px; accent-color: var(--signal); width: 15px; height: 15px; flex-shrink: 0; }
.form-check label { font-size: 11.5px; color: var(--muted); line-height: 1.7; }
.form-status { margin-top: 12px; font-size: 12.5px; min-height: 18px; }
.form-status.is-ok { color: #1f7a4d; }
.form-status.is-error { color: var(--signal-deep); }

/* 404 */
.notfound { min-height: 48vh; display: flex; align-items: center; }
.notfound h1 { font-size: clamp(1.9rem, 3.6vw, 3rem); margin: 16px 0 14px; }
.notfound > .wrap > p:not(.eyebrow) { color: var(--muted); }
.nf-links { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 30px; }

/* ---------------- 页脚 ---------------- */
.site-footer { background: var(--night); color: #c7d2dd; padding-top: clamp(46px, 5.5vw, 68px); padding-bottom: env(safe-area-inset-bottom); border-top: 1px solid var(--night-line); }
.footer-top { display: grid; grid-template-columns: minmax(0, 1.7fr) repeat(3, minmax(0, 1fr)); gap: clamp(24px, 3.5vw, 52px); padding-bottom: 40px; }
.footer-brand .eyebrow { color: var(--night-muted); }
.footer-slogan { font-size: 17px; font-weight: 700; margin: 16px 0 12px; letter-spacing: -.01em; color: #fff; }
.footer-desc { font-size: 12px; color: var(--night-muted); line-height: 1.85; max-width: 380px; }
.footer-col h3 { font-size: 11px; letter-spacing: .1em; color: #fff; margin-bottom: 16px; font-family: var(--font-mono); text-transform: uppercase; }
.footer-col a { display: block; font-size: 12.5px; color: var(--night-muted); padding: 5px 0; line-height: 1.6; transition: color .2s; }
.footer-col a:hover { color: #fff; }
.footer-contact { display: flex; flex-wrap: wrap; gap: 10px 30px; padding: 18px 0; border-top: 1px solid var(--night-line); border-bottom: 1px solid var(--night-line); font-size: 11.5px; color: var(--night-muted); font-family: var(--font-mono); }
.footer-bottom { display: flex; flex-wrap: wrap; gap: 10px 28px; justify-content: space-between; padding: 18px 0 26px; font-size: 11px; color: #6f808f; font-family: var(--font-mono); }
.footer-bottom a:hover { color: #fff; }

/* ---------------- 响应式 ---------------- */
@media (max-width: 1180px) {
  .nav { gap: 13px; }
  .nav-link { font-size: 12.5px; }
  .mini-case, .mini-article { grid-template-columns: 150px minmax(0, 1fr) minmax(0, 1fr) 96px; gap: 16px; }
  .case-row { grid-template-columns: 140px minmax(0, 1fr) 170px 24px; }
}
@media (max-width: 1000px) {
  .nav { display: none; }
  .nav-toggle { display: block; }
  .header-cta { display: none; }
  .mobile-nav:not([hidden]) { display: block; padding: 0 clamp(20px, 4vw, 56px) 18px; }
  .hero-grid, .quality-band > .wrap, .contact-grid, .detail-grid, .prose-cols { grid-template-columns: 1fr; }
  .hero-board { max-width: 620px; }
  .section-head { grid-template-columns: 140px minmax(0, 1fr); }
  .flow { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .flow-step:nth-child(3) { border-right: 0; }
  .flow-step:nth-child(n+4) { border-top: 1px solid var(--line-soft); }
  .flow-step:nth-child(3)::after { display: none; }
  .pillars, .solution-grid, .industry-strip { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-top { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-brand { grid-column: 1 / -1; }
  .detail-aside { position: static; }
  .faq-grid { grid-template-columns: 1fr; gap: 24px; }
  .faq-grid > div:first-child { position: static; }
  .spec-row { grid-template-columns: 150px 1fr 1fr; }
  .case-row { grid-template-columns: 120px minmax(0, 1fr) 24px; }
  .case-figures { display: none; }
  .quality-band-compact > .wrap { grid-template-columns: 1fr; }
  .utility-inner > span:nth-child(n+4) { display: none; }
  /* iOS Safari 在 input 字号 < 16px 时会自动放大整页，破坏 H5 版式与视口 */
  .form-row input, .form-row select, .form-row textarea { font-size: 16px; }
  .form-check input { width: 20px; height: 20px; margin-top: 2px; }
  .btn { min-height: 44px; }
  .filter-btn { min-height: 44px; display: inline-flex; align-items: center; }
  .footer-col a { min-height: 36px; display: flex; align-items: center; }
}
/* 触屏设备：放宽主要可点区域，去掉仅依赖 hover 的位移效果 */
@media (pointer: coarse) {
  .btn, .text-link, .filter-btn, .mobile-nav a { -webkit-tap-highlight-color: rgba(213, 69, 42, .12); }
  .btn { min-height: 44px; }
  .site-header { -webkit-backdrop-filter: saturate(180%) blur(10px); }
}
/* 手机横屏 / 低高度窗口：收起状态条，把纵向空间留给内容 */
@media (max-width: 1000px) and (max-height: 500px) {
  .utility-bar { display: none; }
  .header-inner { height: 56px; }
  [id] { scroll-margin-top: 62px; }
}
@media (max-width: 720px) {
  .mini-case, .mini-article { grid-template-columns: minmax(0, 1fr) 24px; gap: 6px 12px; padding: 16px 4px; }
  .mini-meta { grid-column: 1; }
  .mini-case h3, .mini-article h3 { grid-column: 1; }
  .mini-case p, .mini-article p { grid-column: 1; }
  .mini-more { grid-column: 2; grid-row: 1 / span 3; align-self: center; font-size: 0; }
  .mini-more span { font-size: 14px; }
}
@media (max-width: 640px) {
  .utility-inner { gap: 12px; font-size: 9px; }
  .utility-inner .util-divider, .utility-inner > span:nth-child(n+3) { display: none; }
  .header-inner { height: 58px; }
  .brand-text small { display: none; }
  .hero-grid { padding-block: 44px 56px; gap: 38px; }
  .hero-copy h1 { font-size: clamp(1.95rem, 8vw, 2.5rem); }
  .mark { white-space: normal; }
  .hero-actions .btn { width: 100%; }
  .board-foot strong { font-size: 17px; }
  .board-foot > div { padding: 11px 10px; }
  .ticker-end { display: none; }
  .section { padding-block: 46px; }
  .section-head { grid-template-columns: 1fr; row-gap: 10px; padding-bottom: 18px; margin-bottom: 22px; }
  .section-head .eyebrow { grid-column: 1; grid-row: 1; display: flex; align-items: baseline; gap: 10px; padding-left: 11px; }
  .section-head .eyebrow-num { font-size: 16px; margin: 0; display: inline; }
  .section-head .eyebrow-num.is-rule { display: inline-block; width: 14px; height: 2px; margin: 0 4px 0 0; vertical-align: middle; }
  .section-title, .section-lede { grid-column: 1; }
  .section-title { font-size: 1.55rem; }
  .svc-row { grid-template-columns: 48px minmax(0, 1fr); gap: 6px 12px; padding: 16px 4px; }
  .svc-code { grid-column: 1; padding-top: 3px; }
  .svc-main { grid-column: 2; }
  .svc-items { grid-column: 2; padding-top: 4px; }
  .flow, .pillars, .solution-grid, .industry-strip { grid-template-columns: 1fr; }
  .flow-step { border-right: 0; border-top: 1px solid var(--line-soft); }
  .flow-step:first-child { border-top: 0; }
  .flow-step::after { display: none; }
  .metrics { grid-template-columns: 1fr 1fr; }
  .metric { padding: 16px 14px; }
  .metric-value strong { font-size: 32px; }
  .spec-row { grid-template-columns: 1fr; gap: 4px; }
  .spec-head { display: none; }
  .spec-row span:not(:first-child) { font-size: 12.5px; color: var(--muted); }
  .article-row { grid-template-columns: 38px minmax(0, 1fr) 20px; gap: 12px; }
  .article-no { font-size: 18px; }
  .case-row { grid-template-columns: minmax(0, 1fr); gap: 8px; }
  .case-no { padding-top: 0; }
  .case-figures { display: flex; flex-direction: row; gap: 18px; }
  .form-2col { grid-template-columns: 1fr; }
  .related-list a { grid-template-columns: 1fr 20px; gap: 6px; }
  .related-date { grid-column: 1 / -1; }
  .case-metrics { grid-template-columns: 1fr; }
  .case-metric { border-right: 0; border-bottom: 1px solid var(--line); }
  .footer-top { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
  .cta-inner .btn { width: 100%; }
  .detail-aside { padding: 16px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}