/* ==========================================================================
   北京泽嘉软件有限公司 · 官网样式
   设计语言：极简主义 / 浅色 / 大留白 / 发丝分割线 / 克制的品牌色
   ========================================================================== */

/* ---------- 1. Tokens ---------- */
:root {
  /* 中性色 */
  --bg: #ffffff;
  --bg-soft: #f7f8f9;
  --bg-soft-2: #fbfbfc;
  --ink: #14171a;
  --ink-2: #545a61;
  --ink-3: #6f767d;
  --ink-4: #8b9198;
  --line: #e8eaed;
  --line-strong: #d5d8dc;

  /* 品牌主色 */
  --brand: #0ea7b5;
  --brand-deep: #0b828e;
  --brand-weak: #e6f5f7;

  /* 三条产品线各自的克制度色 */
  --c-zejia: #0ea7b5;
  --c-yousong: #8a6a4b;
  --c-eng: #4a6572;
  --c-pm: #6e8b7a;

  /* 排版 */
  --font: "PingFang SC", "HarmonyOS Sans SC", "Source Han Sans SC",
    "Noto Sans SC", "Microsoft YaHei", ui-sans-serif, system-ui, -apple-system,
    "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-num: "SF Mono", "JetBrains Mono", ui-monospace, Menlo, Consolas,
    "Courier New", monospace;

  /* 尺度 */
  --wrap: 1200px;
  --gutter: 48px;
  --nav-h: 78px;

  /* 动效 */
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- 2. Reset ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}
html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 24px);
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.8;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
h1,
h2,
h3,
h4,
p,
figure,
ul,
ol,
dl {
  margin: 0;
}
ul,
ol {
  padding: 0;
  list-style: none;
}
img,
svg {
  display: block;
  max-width: 100%;
}
a {
  color: inherit;
  text-decoration: none;
}
button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
}
::selection {
  background: var(--brand);
  color: #fff;
}

/* ---------- 3. Layout primitives ---------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 var(--gutter);
}
.section {
  padding: 120px 0;
}
.section--soft {
  background: var(--bg-soft);
}
.section--tight {
  padding: 88px 0;
}
.hairline {
  height: 1px;
  background: var(--line);
  border: 0;
  margin: 0;
}

.grid {
  display: grid;
  gap: 0;
}
/* 列容器自身必须声明 display:grid —— 早期只写了列数，单独使用时会退化成一列堆叠 */
.cols-2,
.cols-3,
.cols-4 {
  display: grid;
  gap: 20px;
}
.cols-2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}
.cols-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}
.cols-4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

/* ---------- 3.5 移动端抽屉导航与全局浮件 ---------- */
.skip {
  position: fixed;
  left: -9999px;
  top: 0;
  z-index: 300;
  background: #fff;
  padding: 10px 18px;
  border: 1px solid var(--line);
  border-radius: 0 0 10px 0;
  font-size: 14px;
  font-weight: 600;
  box-shadow: 0 8px 30px rgba(20, 23, 26, 0.12);
}
.skip:focus {
  left: 0;
}

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

.nav__burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  width: 40px;
  height: 40px;
  padding: 0 8px;
  border-radius: 8px;
  cursor: pointer;
  user-select: none;
  -webkit-user-select: none;
  /* 挂 body 的 fixed 定位：避开 nav 的 backdrop-filter 合成层，
     某些渲染路径会丢弃其后注入的按钮 */
  position: fixed;
  top: calc((var(--nav-h) - 40px) / 2);
  right: var(--gutter);
  z-index: 101;
}
.nav__burger i {
  display: block;
  height: 1.5px;
  background: var(--ink);
  transition: transform 0.3s var(--ease), opacity 0.2s var(--ease);
}
.nav__burger i:first-child {
  width: 20px;
}
.nav__burger i:last-child {
  width: 13px;
}
body.nav-open .nav__burger i:first-child {
  width: 20px;
  transform: translateY(3.75px) rotate(45deg);
}
body.nav-open .nav__burger i:last-child {
  width: 20px;
  transform: translateY(-3.75px) rotate(-45deg);
}

.nav__drawer {
  position: fixed;
  top: var(--nav-h);
  right: 0;
  width: min(320px, 86vw);
  height: calc(100vh - var(--nav-h));
  height: calc(100dvh - var(--nav-h));
  background: #fff;
  border-left: 1px solid var(--line);
  padding: 14px 18px 32px;
  overflow-y: auto;
  transform: translateX(105%);
  transition: transform 0.32s var(--ease);
  z-index: 98;
}
body.nav-open .nav__drawer {
  transform: none;
  box-shadow: -24px 0 60px rgba(20, 23, 26, 0.12);
}
.nav__drawer a {
  display: block;
  padding: 13px 4px;
  font-size: 16px;
  color: var(--ink);
  border-bottom: 1px solid var(--line);
}
.nav__drawer a.d-g {
  font-weight: 600;
}
.nav__drawer a.d-sub {
  font-size: 14.5px;
  color: var(--ink-2);
  padding-left: 16px;
}
.nav__drawer a.d-sub b {
  font-weight: 600;
  margin-right: 8px;
}
.nav__drawer a.d-cta {
  margin-top: 18px;
  text-align: center;
  color: #fff;
  background: var(--brand);
  border: 0;
  border-radius: 100px;
  padding: 13px 0;
  font-weight: 600;
}
.nav__drawer a.d-cta:active {
  background: var(--brand);
}

.nav__scrim {
  position: fixed;
  inset: var(--nav-h) 0 0 0;
  background: rgba(20, 23, 26, 0.32);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s var(--ease), visibility 0.3s;
  z-index: 97;
}
body.nav-open .nav__scrim {
  opacity: 1;
  visibility: visible;
}

.totop {
  position: fixed;
  right: 22px;
  bottom: 22px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--brand);
  color: #fff;
  display: grid;
  place-items: center;
  cursor: pointer;
  user-select: none;
  -webkit-user-select: none;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: all 0.3s var(--ease);
  z-index: 80;
  box-shadow: 0 10px 30px rgba(20, 23, 26, 0.18);
}
.totop.is-on {
  opacity: 0.92;
  visibility: visible;
  transform: none;
}
.totop:hover {
  background: var(--brand-deep);
  opacity: 1;
}

@media (max-width: 780px) {
  .nav__inner {
    justify-content: space-between;
  }
  .nav__burger {
    display: flex;
  }
  .totop {
    right: 14px;
    bottom: 14px;
    width: 40px;
    height: 40px;
  }
}

/* ---------- 4. Typography ---------- */
.eyebrow {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-3);
  display: flex;
  align-items: center;
  gap: 12px;
}
.eyebrow::before {
  content: "";
  width: 24px;
  height: 1px;
  background: var(--brand);
  flex: none;
}

.display {
  font-size: clamp(38px, 4.2vw, 60px);
  line-height: 1.16;
  font-weight: 300;
  letter-spacing: -0.015em;
  text-wrap: balance;
}
.h2 {
  font-size: clamp(28px, 2.6vw, 38px);
  line-height: 1.3;
  font-weight: 300;
  letter-spacing: -0.01em;
  text-wrap: balance;
}
.h3 {
  font-size: 20px;
  line-height: 1.5;
  font-weight: 600;
  letter-spacing: 0.01em;
}
.lead {
  font-size: 17px;
  line-height: 1.9;
  color: var(--ink-2);
}
.muted {
  color: var(--ink-2);
}
.dim {
  color: var(--ink-3);
}
.num {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
}
.strong-em {
  font-weight: 600;
  color: var(--ink);
  box-shadow: inset 0 -0.5em 0 var(--brand-weak);
}

/* ---------- 5. Nav ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-h);
  background: rgba(255, 255, 255, 0.86);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--line);
  transition: box-shadow 0.3s var(--ease), border-color 0.3s var(--ease);
}
.nav.is-scrolled {
  box-shadow: 0 1px 24px rgba(20, 23, 26, 0.05);
}
.nav__inner {
  height: var(--nav-h);
  display: flex;
  align-items: center;
  gap: 40px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: none;
}
.brand img {
  display: block;
  flex: none;
}
.brand__logo {
  display: block;
  flex: none;
  height: 54px;
  width: auto;
}
@media (max-width: 780px) {
  .brand__logo {
    height: 40px;
  }
}
.brand__name {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: 0.02em;
  line-height: 1.2;
}
.brand__sub {
  font-size: 10px;
  letter-spacing: 0.24em;
  color: var(--ink-3);
  text-transform: uppercase;
  line-height: 1.2;
}
.nav__links {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
}
.nav__link {
  position: relative;
  padding: 8px 14px;
  font-size: 15px;
  color: var(--ink-2);
  border-radius: 6px;
  transition: color 0.2s var(--ease), background 0.2s var(--ease);
}
.nav__link:hover {
  color: var(--ink);
  background: var(--bg-soft);
}
.nav__link.is-active {
  color: var(--ink);
  font-weight: 600;
}
.nav__cta {
  margin-left: 12px;
  padding: 9px 20px;
  font-size: 14px;
  font-weight: 600;
  color: #fff;
  background: var(--brand);
  border-radius: 100px;
  transition: background 0.25s var(--ease), transform 0.25s var(--ease);
}
.nav__cta:hover {
  background: var(--brand-deep);
  transform: translateY(-1px);
}

/* 下拉：产品线 */
.has-menu {
  position: relative;
}
.menu {
  position: absolute;
  top: calc(100% + 10px);
  left: 50%;
  transform: translateX(-50%) translateY(-6px);
  width: 260px;
  padding: 8px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 14px;
  box-shadow: 0 18px 48px rgba(20, 23, 26, 0.1);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.22s var(--ease), transform 0.22s var(--ease),
    visibility 0.22s;
}
.has-menu:hover .menu,
.has-menu:focus-within .menu {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}
.menu::before {
  content: "";
  position: absolute;
  top: -12px;
  left: 0;
  right: 0;
  height: 12px;
}
.menu__item {
  display: block;
  padding: 10px 12px;
  border-radius: 9px;
  transition: background 0.18s var(--ease);
}
.menu__item:hover {
  background: var(--bg-soft);
}
.menu__item b {
  display: block;
  font-size: 14.5px;
  font-weight: 600;
}
.menu__item span {
  display: block;
  font-size: 12.5px;
  color: var(--ink-3);
  line-height: 1.6;
}

/* ---------- 6. Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 26px;
  font-size: 15px;
  font-weight: 600;
  border-radius: 100px;
  border: 1px solid transparent;
  transition: all 0.28s var(--ease);
  white-space: nowrap;
}
.btn--dark {
  background: var(--brand);
  color: #fff;
}
.btn--dark:hover {
  background: var(--brand-deep);
}
.btn--ghost {
  border-color: var(--line-strong);
  color: var(--ink);
  background: #fff;
}
.btn--ghost:hover {
  border-color: var(--brand);
  background: var(--brand);
  color: #fff;
}
.btn .arw {
  transition: transform 0.28s var(--ease);
}
.btn:hover .arw {
  transform: translateX(4px);
}

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 15px;
  font-weight: 600;
  color: var(--brand-deep);
}
.link-arrow svg {
  transition: transform 0.28s var(--ease);
}
.link-arrow:hover svg {
  transform: translateX(5px);
}

/* ---------- 7. Hero ---------- */
.hero {
  position: relative;
  padding: 132px 0 120px;
  overflow: hidden;
}
.hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  gap: 72px;
  align-items: center;
}
.hero__title {
  margin: 26px 0 30px;
}
.hero__title em {
  font-style: normal;
  color: var(--brand);
  font-weight: 500;
}
.hero__lead {
  max-width: 46ch;
}
.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 40px;
}
.hero__meta {
  display: flex;
  gap: 40px;
  margin-top: 64px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}
.hero__meta b {
  display: block;
  font-size: 30px;
  font-weight: 300;
  letter-spacing: -0.02em;
  line-height: 1.2;
}
.hero__meta span {
  font-size: 13px;
  color: var(--ink-3);
  letter-spacing: 0.04em;
}
.hero__visual {
  position: relative;
  aspect-ratio: 1 / 1;
  display: grid;
  place-items: center;
}

/* Hero 背景网格 */
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: linear-gradient(
      to right,
      var(--line) 1px,
      transparent 1px
    ),
    linear-gradient(to bottom, var(--line) 1px, transparent 1px);
  background-size: 120px 120px;
  -webkit-mask-image: radial-gradient(
    ellipse 70% 60% at 62% 42%,
    #000 0%,
    transparent 72%
  );
  mask-image: radial-gradient(
    ellipse 70% 60% at 62% 42%,
    #000 0%,
    transparent 72%
  );
  opacity: 0.7;
  z-index: 0;
}
.hero .wrap {
  position: relative;
  z-index: 1;
}

/* ---------- 8. 产品线行（核心区） ---------- */
.plines {
  border-top: 1px solid var(--line);
}
.pline {
  display: grid;
  grid-template-columns: 96px minmax(0, 300px) minmax(0, 1fr) 190px;
  gap: 40px;
  align-items: start;
  padding: 52px 0;
  border-bottom: 1px solid var(--line);
  transition: background 0.35s var(--ease);
}
.pline:hover {
  background: var(--bg-soft-2);
}
.pline__idx {
  font-family: var(--font-num);
  font-size: 13px;
  color: var(--ink-4);
  letter-spacing: 0.14em;
  padding-top: 6px;
}
.pline__tm {
  font-size: 21px;
  font-weight: 600;
  letter-spacing: 0;
  line-height: 1;
  color: #fff;
  background: var(--tone, var(--brand));
  padding: 1px 9px 2px;
  border-radius: 6px;
  margin-left: 9px;
  vertical-align: 6px;
}
.pline__title {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  font-size: 26px;
  font-weight: 500;
  letter-spacing: -0.005em;
  line-height: 1.35;
}
.pline__cat {
  margin-top: 8px;
  font-size: 13.5px;
  color: var(--ink-3);
  letter-spacing: 0.06em;
}
.pline__desc {
  font-size: 15.5px;
  color: var(--ink-2);
  line-height: 1.9;
  max-width: 52ch;
}
.pline__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
}
.tag {
  font-size: 12.5px;
  color: var(--ink-2);
  padding: 4px 11px;
  border: 1px solid var(--line);
  border-radius: 100px;
  background: #fff;
}
.pline__go {
  justify-self: end;
  padding-top: 6px;
}
.pline__icon {
  width: 40px;
  height: 40px;
  margin-bottom: 22px;
  color: var(--tone, var(--brand));
}

/* ---------- 9. 分区标题 ---------- */
.sec-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 60px;
  align-items: end;
  margin-bottom: 64px;
}
.sec-head__title {
  margin-top: 18px;
}
.sec-head__desc {
  max-width: 50ch;
  padding-bottom: 6px;
}

/* ---------- 10. 架构图 ---------- */
.arch {
  border: 1px solid var(--line);
  border-radius: 18px;
  background: #fff;
  padding: 40px;
}
.arch__row {
  display: grid;
  gap: 12px;
}
.arch__label {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.16em;
  color: var(--ink-3);
  text-transform: uppercase;
  margin-bottom: 14px;
}
.arch__cells {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 10px;
}
.arch__cell {
  text-align: center;
  padding: 18px 6px;
  font-size: 13.5px;
  color: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--bg-soft-2);
  line-height: 1.5;
}
.arch__cell b {
  display: block;
  font-size: 14.5px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 2px;
}
.arch__cells--3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}
.arch__cells--2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}
.arch__flow {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  padding: 20px 0;
}
.arch__arrow {
  flex: 1;
  height: 1px;
  background: var(--line-strong);
  position: relative;
}
.arch__arrow::after {
  content: "";
  position: absolute;
  right: 0;
  top: 50%;
  width: 6px;
  height: 6px;
  border-top: 1px solid var(--line-strong);
  border-right: 1px solid var(--line-strong);
  transform: translateY(-50%) rotate(45deg);
}
.arch__note {
  font-size: 13px;
  color: var(--ink-3);
  white-space: nowrap;
}
.arch__core {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}
.arch__core .arch__cell {
  background: #fff;
  border-color: var(--brand);
  color: var(--brand-deep);
}
.arch__core .arch__cell b {
  color: var(--brand-deep);
}

/* ---------- 11. 通用卡片 ---------- */
.card {
  padding: 36px 32px 40px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 16px;
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease),
    box-shadow 0.3s var(--ease);
}
.card:hover {
  border-color: var(--line-strong);
  transform: translateY(-3px);
  box-shadow: 0 14px 40px rgba(20, 23, 26, 0.06);
}
.card__ico {
  width: 34px;
  height: 34px;
  margin-bottom: 20px;
  color: var(--brand);
}
.card__title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 10px;
}
.card__text {
  font-size: 14.5px;
  color: var(--ink-2);
  line-height: 1.85;
}

/* 行业 */
.ind-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}
.ind {
  padding: 34px 24px 38px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: #fff;
  transition: background 0.3s var(--ease);
}
.ind:hover {
  background: var(--bg-soft-2);
}
.ind b {
  display: block;
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 8px;
}
.ind span {
  font-size: 13.5px;
  color: var(--ink-3);
  line-height: 1.75;
}

/* ---------- 12. 服务流程 ---------- */
.flow {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0;
}
.flow__step {
  position: relative;
  padding: 40px 28px 0 0;
  border-top: 2px solid var(--line);
}
.flow__step::before {
  content: "";
  position: absolute;
  top: -5px;
  left: 0;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--brand);
}
.flow__num {
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--ink-4);
  margin-bottom: 12px;
  display: block;
}
.flow__step h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 10px;
}
.flow__step p {
  font-size: 14.5px;
  color: var(--ink-2);
  line-height: 1.85;
}

/* ---------- 13. 公众号条 ---------- */
.wxband {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 72px;
  align-items: center;
  padding: 72px 64px;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: var(--bg-soft);
}
.qr {
  width: 100%;
  aspect-ratio: 1 / 1;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 16px;
  display: grid;
  place-items: center;
  text-align: center;
  padding: 24px;
}
.qr__box {
  width: 100%;
  aspect-ratio: 1 / 1;
  border: 1px dashed var(--line-strong);
  border-radius: 10px;
  display: grid;
  place-items: center;
  font-size: 12.5px;
  color: var(--ink-3);
  line-height: 1.7;
  padding: 16px;
}

/* ---------- 14. CTA ---------- */
.cta {
  padding: 116px 0;
  text-align: center;
  border-top: 1px solid var(--line);
}
.cta__actions {
  display: flex;
  justify-content: center;
  gap: 14px;
  margin-top: 40px;
}

/* ---------- 15. Footer ---------- */
.footer {
  background: var(--bg-soft);
  border-top: 1px solid var(--line);
  padding: 76px 0 32px;
  font-size: 14px;
}
.footer__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) repeat(3, minmax(0, 1fr));
  gap: 48px;
  padding-bottom: 56px;
  border-bottom: 1px solid var(--line);
}
.footer__col h3 {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--ink);
  margin-bottom: 18px;
}
.footer__col li {
  margin-bottom: 10px;
}
.footer__col a {
  color: var(--ink-2);
  transition: color 0.2s var(--ease);
}
.footer__col a:hover {
  color: var(--brand-deep);
}
.footer__intro {
  font-size: 14px;
  color: var(--ink-2);
  line-height: 1.9;
  max-width: 40ch;
  margin-top: 18px;
}
.footer__bottom {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: space-between;
  padding-top: 26px;
  color: var(--ink-3);
  font-size: 13px;
}

/* ---------- 16. 内页通用 ---------- */
.phead {
  padding: 96px 0 72px;
  border-bottom: 1px solid var(--line);
  background: var(--bg-soft-2);
}
.phead__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 340px);
  gap: 64px;
  align-items: end;
}
.crumb {
  font-size: 13px;
  color: var(--ink-3);
  margin-bottom: 22px;
}
.crumb a:hover {
  color: var(--brand-deep);
}
.phead__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 26px;
}
.phead__aside {
  border-left: 1px solid var(--line);
  padding-left: 32px;
}
.phead__aside dl {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 10px 20px;
  font-size: 14px;
}
.phead__aside dt {
  color: var(--ink-3);
}
.phead__aside dd {
  font-weight: 600;
}

/* 特性列表 */
.feat-grid {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 16px;
  overflow: hidden;
}
.feat {
  background: #fff;
  padding: 34px 32px 38px;
}
.feat__n {
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--brand);
  display: block;
  margin-bottom: 14px;
}
.feat h3 {
  font-size: 17.5px;
  font-weight: 600;
  margin-bottom: 12px;
}
.feat p {
  font-size: 14.5px;
  color: var(--ink-2);
  line-height: 1.85;
}
.feat ul {
  margin-top: 14px;
}
.feat li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  color: var(--ink-2);
  line-height: 1.9;
}
.feat li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 13px;
  width: 5px;
  height: 1px;
  background: var(--brand);
}

/* 模块表 */
.mod-table {
  width: 100%;
  border-collapse: collapse;
  border: 1px solid var(--line);
  border-radius: 14px;
  overflow: hidden;
  font-size: 14.5px;
  background: #fff;
}
.mod-table th,
.mod-table td {
  padding: 16px 20px;
  text-align: left;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
  line-height: 1.8;
}
.mod-table thead th {
  background: var(--bg-soft);
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--ink-2);
  text-transform: uppercase;
}
.mod-table tbody tr:last-child td {
  border-bottom: 0;
}
.mod-table tbody tr:hover {
  background: var(--bg-soft-2);
}
.mod-table td:first-child {
  font-weight: 600;
  white-space: nowrap;
  width: 168px;
}
.mod-table td:nth-child(2) {
  color: var(--ink-2);
}

/* 案例 */
.case {
  display: grid;
  grid-template-columns: 76px minmax(0, 1fr);
  gap: 28px;
  padding: 40px 0;
  border-bottom: 1px solid var(--line);
}
.case:last-child {
  border-bottom: 0;
}
.case__tag {
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ink-4);
  padding-top: 6px;
}
.case h3 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 14px;
}
.case p {
  font-size: 15px;
  color: var(--ink-2);
  line-height: 1.9;
  margin-bottom: 12px;
}
.case__kv {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  margin-top: 20px;
  padding-top: 18px;
  border-top: 1px dashed var(--line);
}
.case__kv div {
  font-size: 13.5px;
}
.case__kv b {
  display: block;
  color: var(--ink-3);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.06em;
  margin-bottom: 3px;
}

/* 引言块 */
.quote {
  padding: 44px 48px;
  border-left: 3px solid var(--brand);
  background: var(--bg-soft);
  border-radius: 0 14px 14px 0;
}
.quote p {
  font-size: 20px;
  line-height: 1.75;
  font-weight: 400;
  color: var(--ink);
}
.quote cite {
  display: block;
  margin-top: 16px;
  font-size: 13.5px;
  font-style: normal;
  color: var(--ink-3);
}

/* 痛点/解法两栏 */
.vs {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border: 1px solid var(--line);
  border-radius: 16px;
  overflow: hidden;
}
.vs__side {
  padding: 38px 34px 42px;
}
.vs__side:first-child {
  border-right: 1px solid var(--line);
  background: var(--bg-soft-2);
}
.vs__side h3 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 20px;
  letter-spacing: 0.04em;
}
.vs__side:first-child h3 {
  color: var(--ink-3);
}
.vs__side:last-child h3 {
  color: var(--brand-deep);
}
.vs__side li {
  position: relative;
  padding-left: 22px;
  font-size: 14.5px;
  color: var(--ink-2);
  line-height: 1.85;
  margin-bottom: 12px;
}
.vs__side:first-child li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--ink-4);
}
.vs__side:last-child li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 10px;
  height: 6px;
  border-left: 1.5px solid var(--brand);
  border-bottom: 1.5px solid var(--brand);
  transform: rotate(-45deg);
}

/* ---------- 16b. 页面色调（产品线各自的克制配色） ---------- */
.tone-zejia {
  --brand: #0ea7b5;
  --brand-deep: #0b828e;
  --brand-weak: #e6f5f7;
}
.tone-yousong {
  --brand: #8a6a4b;
  --brand-deep: #6d5238;
  --brand-weak: #f2ebe3;
}
.tone-eng {
  --brand: #4a6572;
  --brand-deep: #384e59;
  --brand-weak: #e9eef0;
}
.tone-pm {
  --brand: #6e8b7a;
  --brand-deep: #556c5e;
  --brand-weak: #ecf1ed;
}

/* ---------- 17. 动效 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.75s var(--ease), transform 0.75s var(--ease);
}
.reveal.is-in {
  opacity: 1;
  transform: none;
}
@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
  html {
    scroll-behavior: auto;
  }
}

/* ---------- 18. 响应式（保 PC 优先，向下兼容） ---------- */
@media (max-width: 1100px) {
  :root {
    --gutter: 32px;
  }
  .hero__grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }
  .hero__visual {
    max-width: 380px;
  }
  .pline {
    grid-template-columns: 64px minmax(0, 1fr);
    gap: 20px 24px;
  }
  .pline__go {
    grid-column: 2;
    justify-self: start;
  }
  .pline > div:not(.pline__idx):not(.pline__go) {
    grid-column: 2;
  }
  .ind-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .footer__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .line-break {
    grid-column: 1 / -1;
  }
  .wxband {
    grid-template-columns: 1fr;
    gap: 40px;
    padding: 48px 36px;
  }
  .qr {
    max-width: 240px;
  }
}
@media (max-width: 780px) {
  :root {
    --gutter: 22px;
    --nav-h: 62px;
  }
  .pline {
    grid-template-columns: minmax(0, 1fr);
    gap: 14px;
    padding: 38px 0;
  }
  .pline__idx {
    padding-top: 0;
  }
  .pline > div:not(.pline__idx):not(.pline__go) {
    grid-column: 1;
  }
  .pline__go {
    grid-column: 1;
  }
  .section {
    padding: 76px 0;
  }
  .nav__links {
    display: none;
  }
  .sec-head,
  .phead__inner,
  .cols-2,
  .cols-3,
  .cols-4,
  .flow,
  .arch__cells,
  .arch__core,
  .ind-grid,
  .footer__grid {
    grid-template-columns: 1fr;
  }
  .arch__cells,
  .arch__core {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .flow__step {
    padding-right: 0;
  }
  .vs {
    grid-template-columns: 1fr;
  }
  .vs__side:first-child {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }
  .hero {
    padding: 76px 0 64px;
  }
  .hero__meta {
    gap: 28px;
    flex-wrap: wrap;
  }
  .phead__aside {
    border-left: 0;
    padding-left: 0;
    border-top: 1px solid var(--line);
    padding-top: 24px;
  }
  .quote {
    padding: 28px 24px;
  }
}

/* ---------- 19. 打印 ---------- */
@media print {
  .nav,
  .footer,
  .hero::after {
    display: none;
  }
  .reveal {
    opacity: 1;
    transform: none;
  }
  body {
    color: #000;
  }
}

/* 中等宽度（781–960px）：导航链接收起，改用汉堡菜单，避免放大后的 logo 挤压 */
@media (max-width: 960px) {
  .nav__links {
    display: none;
  }
  .nav__burger {
    display: flex;
  }
}


/* ---------- 中文排版：避免孤字 / 孤词 ---------- */
h1, h2, h3, h4,
.display, .h2, .hero__title, .sec-head__title,
.card__title, .pline__title, .flow__step h3, .case h3 {
  text-wrap: balance;
}
p, li, td, dd, .lead, .card__text, .pline__desc, .footer__intro {
  text-wrap: pretty;
  word-break: normal;
}
.nw { white-space: nowrap; }