:root {
  --ink-950: #0b0d10;
  --ink-900: #13161b;
  --ink-800: #20242b;
  --paper-50: #f4f1ea;
  --paper-100: #ebe7df;
  --paper-200: #d8d3c8;
  --graphite-600: #62666d;
  --violet: #a79bc8;
  --sand: #c9a96e;
  --serif: "Noto Serif SC", "Songti SC", STSong, serif;
  --sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --latin: Inter, "Helvetica Neue", Arial, sans-serif;
  --pad-x: clamp(20px, 4.5vw, 72px);
  --section-y: clamp(88px, 11vw, 160px);
  --header-height: 72px;
}

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

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink-950);
  background: var(--paper-50);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.8;
  text-rendering: optimizeLegibility;
}

body.menu-open { overflow: hidden; }

a { color: inherit; }
a:visited { color: inherit; }
a:focus-visible, button:focus-visible { outline: 2px solid var(--violet); outline-offset: 3px; }
button { font: inherit; }

.skip-link {
  position: fixed;
  z-index: 1000;
  left: 20px;
  top: 14px;
  padding: 8px 14px;
  color: var(--ink-950);
  background: var(--paper-50);
  transform: translateY(-150%);
}
.skip-link:focus { transform: translateY(0); }

.page-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  column-gap: clamp(16px, 1.7vw, 28px);
  width: min(100%, 1584px);
  margin-inline: auto;
  padding-inline: var(--pad-x);
}

section[id] { scroll-margin-top: var(--header-height); }
.section-pad { padding-block: var(--section-y); }
.section-dark { color: var(--paper-50); background: var(--ink-950); }
.section-light { background: var(--paper-50); }
.section-paper { background: var(--paper-100); }
.section-ink { color: var(--paper-50); background: var(--ink-800); }
.section-muted { background: #dddad3; }

.site-header {
  position: fixed;
  z-index: 100;
  inset: 0 0 auto;
  display: grid;
  grid-template-columns: minmax(220px, 1fr) auto minmax(150px, 1fr);
  align-items: center;
  min-height: var(--header-height);
  padding: 14px var(--pad-x);
  color: white;
  border-bottom: 1px solid rgb(255 255 255 / 16%);
  transition: background-color 180ms ease, backdrop-filter 180ms ease;
}
.site-header.is-scrolled { background: rgb(11 13 16 / 88%); backdrop-filter: blur(16px); }
.site-name, .desktop-nav a, .platform-shortcut {
  color: rgb(255 255 255 / 72%);
  text-decoration: none;
}
.site-name { justify-self: start; font-size: 14px; letter-spacing: .04em; white-space: nowrap; }
.desktop-nav { display: flex; gap: clamp(14px, 1.45vw, 28px); }
.desktop-nav a { position: relative; font-size: 13px; white-space: nowrap; }
.desktop-nav a::after {
  position: absolute;
  left: 50%;
  bottom: -13px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--paper-50);
  content: "";
  opacity: 0;
  transform: translateX(-50%);
}
.desktop-nav a[aria-current="location"]::after { opacity: 1; }
.desktop-nav a:hover, .site-name:hover, .platform-shortcut:hover { color: white; text-decoration: underline; text-underline-offset: 5px; }
.platform-shortcut { justify-self: end; font-size: 13px; text-decoration: underline; text-underline-offset: 5px; }
.menu-button { display: none; }

.mobile-menu {
  position: fixed;
  z-index: 200;
  inset: 0;
  display: grid;
  grid-template-rows: auto 1fr auto;
  padding: 22px var(--pad-x) 32px;
  color: var(--paper-50);
  background: var(--ink-950);
  visibility: hidden;
  opacity: 0;
  pointer-events: none;
  transition: opacity 180ms ease, visibility 180ms ease;
}
.mobile-menu.is-open { visibility: visible; opacity: 1; pointer-events: auto; }
.mobile-menu__top { display: flex; align-items: center; justify-content: space-between; font-size: 13px; letter-spacing: .08em; }
.mobile-menu button { padding: 6px 0; color: white; background: transparent; border: 0; text-decoration: underline; text-underline-offset: 5px; cursor: pointer; }
.mobile-menu nav { display: grid; align-content: center; gap: 2px; }
.mobile-menu nav a { padding: 4px 0; font-family: var(--serif); font-size: clamp(32px, 8vw, 52px); line-height: 1.35; text-decoration: none; border-bottom: 1px solid rgb(255 255 255 / 16%); }
.mobile-menu > p { margin: 0; color: rgb(255 255 255 / 68%); font-size: 13px; line-height: 1.6; }
.mobile-menu > p span { font-family: var(--latin); letter-spacing: .12em; }

.hero {
  position: relative;
  min-height: max(680px, min(88vh, 920px));
  overflow: hidden;
}
.hero__image { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; object-position: 50% 45%; }
.hero__shade { position: absolute; inset: 0; background: linear-gradient(180deg, rgb(0 0 0 / 18%) 0%, rgb(6 8 10 / 8%) 36%, rgb(6 8 10 / 82%) 100%), rgb(0 0 0 / 12%); }
.hero__content { position: relative; z-index: 1; min-height: inherit; grid-template-rows: auto 1fr auto auto; padding-top: calc(var(--header-height) + 34px); padding-bottom: 30px; }
.eyebrow, .section-kicker { margin: 0; font-family: var(--latin), var(--sans); font-size: 12px; letter-spacing: .16em; text-transform: uppercase; }
.hero__eyebrow { grid-column: 1 / 5; color: rgb(255 255 255 / 78%); }
.hero__eyebrow span { margin-left: 10px; }
.hero h1 { grid-column: 1 / 9; align-self: end; margin: 0 0 24px; font-family: var(--serif); font-size: clamp(56px, 7.2vw, 112px); font-weight: 500; line-height: 1.03; letter-spacing: -.045em; text-wrap: balance; }
.hero__intro { grid-column: 10 / 13; align-self: end; margin: 0 0 34px; color: rgb(255 255 255 / 84%); font-size: 16px; line-height: 1.8; }
.continue-link { grid-column: 1 / 4; align-self: end; width: fit-content; color: rgb(255 255 255 / 70%); font-size: 13px; letter-spacing: .08em; text-decoration: none; }
.continue-link:hover { color: white; text-decoration: underline; text-underline-offset: 5px; }
.continue-link span { display: inline-block; margin-left: 8px; }

.section-number { display: block; font-family: var(--latin); font-size: clamp(82px, 10vw, 154px); font-weight: 300; line-height: .8; letter-spacing: -.08em; }
.section-kicker { color: var(--graphite-600); }
.section-marker { grid-column: 1 / 4; display: grid; grid-template-columns: auto auto; align-content: start; gap: 34px 24px; }
.section-marker .section-number { grid-column: 1 / -1; }
.section-marker h2 { margin: 0; font-family: var(--serif); font-size: 20px; font-weight: 500; letter-spacing: .12em; writing-mode: vertical-rl; }
.company__content { grid-column: 5 / 13; }
.index-list { margin: 34px 0 0; border-top: 1px solid #aaa69e; }
.index-list > div { display: grid; grid-template-columns: 2fr 6fr; gap: 24px; padding: 28px 0; border-bottom: 1px solid #aaa69e; }
.index-list dt { color: var(--graphite-600); font-size: 14px; }
.index-list dd { margin: 0; font-family: var(--serif); font-size: clamp(20px, 2.2vw, 32px); line-height: 1.5; }
.index-list > div:last-child dd { font-family: var(--sans); font-size: 18px; }
.editor-note { max-width: 690px; margin: 46px 0 0 auto; padding-left: 22px; color: #51545a; border-left: 2px solid var(--violet); font-size: 15px; }

.platform { border-top: 1px solid rgb(255 255 255 / 12%); }
.platform__heading { grid-column: 1 / 6; }
.platform__heading .section-kicker { color: var(--violet); }
.platform__heading .section-number { margin: 66px 0 32px; color: rgb(255 255 255 / 18%); }
.platform__heading h2 { margin: 0; font-family: var(--serif); font-size: clamp(44px, 5.2vw, 76px); font-weight: 500; line-height: 1.1; }
.platform__heading > p:last-child { max-width: 460px; margin: 32px 0 0; color: rgb(255 255 255 / 65%); }
.platform-entry { grid-column: 6 / 13; align-self: end; display: grid; grid-template-columns: repeat(7, minmax(0, 1fr)); background: #252931; border-top: 2px solid var(--violet); transition: background-color 180ms ease; }
.platform-entry:hover { background: #2c3038; }
.platform-entry__index { grid-column: 1 / -1; padding: 20px 24px; color: var(--violet); font-family: var(--latin); font-size: 11px; letter-spacing: .17em; border-bottom: 1px solid rgb(167 155 200 / 38%); }
.platform-entry__name, .platform-entry__operator, .platform-entry__intro { padding: clamp(28px, 3vw, 46px) 24px; }
.platform-entry__name { grid-column: 1 / 5; border-right: 1px solid rgb(167 155 200 / 30%); }
.platform-entry__operator { grid-column: 5 / 8; }
.platform-entry__intro { grid-column: 1 / -1; border-top: 1px solid rgb(167 155 200 / 30%); }
.platform-entry span { display: block; margin-bottom: 15px; color: rgb(255 255 255 / 52%); font-size: 12px; letter-spacing: .1em; }
.platform-entry h3, .platform-entry p { margin: 0; }
.platform-entry h3 { font-family: var(--serif); font-size: clamp(30px, 3.5vw, 50px); font-weight: 500; line-height: 1.25; }
.platform-entry__operator p { font-size: 16px; line-height: 1.65; }
.platform-entry__intro p { max-width: 720px; font-family: var(--serif); font-size: clamp(20px, 2.1vw, 29px); line-height: 1.65; }

.scenarios__intro { grid-column: 1 / 5; }
.scenarios__intro .section-number { margin-bottom: 60px; color: #c8c2b7; }
.scenarios__intro h2 { margin: 25px 0 30px; font-family: var(--serif); font-size: clamp(34px, 3.9vw, 58px); font-weight: 500; line-height: 1.28; letter-spacing: -.03em; }
.scenarios__intro > p:last-child { max-width: 420px; color: var(--graphite-600); }
.comparison { grid-column: 6 / 13; align-self: end; border-top: 1px solid var(--ink-950); }
.comparison__head { display: grid; grid-template-columns: 2.5fr 3.5fr; gap: 32px; padding: 12px 0; color: var(--graphite-600); font-size: 12px; letter-spacing: .1em; border-bottom: 1px solid #aaa69e; }
.comparison__row { position: relative; display: grid; grid-template-columns: 2.5fr 3.5fr; gap: 32px; padding: 30px 0 30px 48px; border-bottom: 1px solid #aaa69e; }
.comparison__number { position: absolute; left: 0; top: 32px; color: var(--graphite-600); font-family: var(--latin); font-size: 12px; }
.comparison__row strong { font-family: var(--serif); font-size: 20px; font-weight: 500; line-height: 1.55; }
.comparison__row p { margin: 0; color: #484c52; font-size: 15px; }
.comparison__note { margin: 28px 0 0; padding-left: 48px; color: var(--graphite-600); font-size: 13px; }

.collaboration { overflow: hidden; }
.collaboration__header .section-number { grid-column: 1 / 4; color: var(--paper-200); }
.collaboration__header > div { grid-column: 5 / 11; }
.collaboration h2 { margin: 24px 0 80px; font-family: var(--serif); font-size: clamp(44px, 5.2vw, 74px); font-weight: 500; line-height: 1.18; letter-spacing: -.035em; }
.chapters { position: relative; row-gap: 0; }
.chapters::before { position: absolute; top: 0; bottom: 0; left: calc(50% - .5px); width: 1px; background: #b7b1a7; content: ""; }
.chapter { position: relative; display: grid; grid-template-columns: 80px 1fr; gap: 30px; padding-block: 48px; border-top: 1px solid #b7b1a7; }
.chapter--left { grid-column: 1 / 7; padding-right: 9%; }
.chapter--right { grid-column: 7 / 13; padding-left: 9%; }
.chapter > span { color: var(--violet); font-family: var(--latin); font-size: 13px; }
.chapter h3 { margin: -8px 0 14px; font-family: var(--serif); font-size: clamp(27px, 2.6vw, 40px); font-weight: 500; }
.chapter p { margin: 0; color: #53565b; font-size: 15px; }
.collaboration__note { width: min(650px, calc(100% - 40px)); margin: 60px auto 0; text-align: center; color: var(--graphite-600); font-size: 14px; }

.preparation__heading { grid-column: 1 / 5; }
.preparation__heading .section-number { color: rgb(255 255 255 / 14%); }
.preparation__heading .section-kicker { margin-top: 58px; color: var(--violet); }
.preparation__heading h2 { margin: 26px 0 0; font-family: var(--serif); font-size: clamp(40px, 4.5vw, 66px); font-weight: 500; line-height: 1.2; }
.preparation__list { grid-column: 6 / 10; padding-top: 22px; }
.preparation__list h3, .safety-note h3 { margin: 0 0 28px; font-family: var(--serif); font-size: 25px; font-weight: 500; }
.preparation__list ul { margin: 0; padding: 0; list-style: none; border-top: 1px solid rgb(255 255 255 / 24%); }
.preparation__list li { display: grid; grid-template-columns: 18px 1fr; gap: 14px; padding: 20px 0; border-bottom: 1px solid rgb(255 255 255 / 24%); font-size: 15px; }
.preparation__list li span { width: 15px; height: 15px; margin-top: 7px; border: 1px solid var(--violet); }
.safety-note { grid-column: 10 / 13; align-self: end; margin-left: 18px; padding: 28px; color: var(--ink-950); background: var(--sand); }
.safety-note .section-kicker { color: #4c402e; }
.safety-note h3 { margin-top: 30px; }
.safety-note p:not(.section-kicker) { font-family: var(--serif); font-size: 19px; line-height: 1.7; }
.safety-note small { display: block; margin-top: 38px; padding-top: 18px; border-top: 1px solid rgb(11 13 16 / 35%); font-size: 12px; line-height: 1.7; }

.boundaries__header .section-number { grid-column: 1 / 4; color: #c3bfb6; }
.boundaries__header > div { grid-column: 5 / 12; }
.boundaries h2 { margin: 24px 0 70px; font-family: var(--serif); font-size: clamp(44px, 5vw, 72px); font-weight: 500; line-height: 1.15; }
.boundary-table { display: grid; }
.boundary-table__head, .boundary-table__row { grid-column: 2 / 12; display: grid; grid-template-columns: 1fr 1fr; }
.boundary-table__head { color: var(--graphite-600); font-size: 13px; letter-spacing: .08em; border-top: 2px solid var(--ink-950); border-bottom: 1px solid #9d9a93; }
.boundary-table__head span, .boundary-table__row p { padding: 20px 30px; }
.boundary-table__head span + span, .boundary-table__row p + p { border-left: 1px solid #9d9a93; }
.boundary-table__row { border-bottom: 1px solid #9d9a93; }
.boundary-table__row p { margin: 0; font-family: var(--serif); font-size: 18px; line-height: 1.7; }
.boundary-table__row p + p { color: #505359; }
.boundary-closing { max-width: 680px; margin: 54px auto 0; text-align: center; color: var(--graphite-600); }

.site-footer { display: grid; grid-template-columns: 1fr auto 1fr; gap: 24px; align-items: center; padding: 34px var(--pad-x); color: rgb(255 255 255 / 64%); background: var(--ink-950); font-size: 13px; }
.site-footer span:nth-child(2) { justify-self: center; }
.site-footer a { justify-self: end; color: var(--paper-50); text-decoration: underline; text-underline-offset: 4px; }
.site-footer a:hover { text-decoration-thickness: 2px; }

@media (max-width: 1199px) {
  .page-grid { grid-template-columns: repeat(8, minmax(0, 1fr)); }
  .desktop-nav { display: none; }
  .site-header { grid-template-columns: 1fr auto auto; gap: 24px; }
  .menu-button { display: inline-block; padding: 4px 0; color: rgb(255 255 255 / 78%); background: transparent; border: 0; text-decoration: underline; text-underline-offset: 5px; cursor: pointer; }
  .hero h1 { grid-column: 1 / 7; }
  .hero__intro { grid-column: 5 / 9; }
  .company__content { grid-column: 3 / 9; }
  .platform__heading { grid-column: 1 / 4; }
  .platform-entry { grid-column: 4 / 9; }
  .scenarios__intro { grid-column: 1 / 4; }
  .comparison { grid-column: 4 / 9; }
  .collaboration__header .section-number { grid-column: 1 / 3; }
  .collaboration__header > div { grid-column: 3 / 8; }
  .chapter--left { grid-column: 1 / 5; }
  .chapter--right { grid-column: 5 / 9; }
  .preparation__heading { grid-column: 1 / 4; }
  .preparation__list { grid-column: 4 / 7; }
  .safety-note { grid-column: 7 / 9; margin-left: 0; padding: 22px; }
  .boundaries__header .section-number { grid-column: 1 / 3; }
  .boundaries__header > div { grid-column: 3 / 8; }
  .boundary-table__head, .boundary-table__row { grid-column: 1 / 9; }
}

@media (max-width: 767px) {
  :root { --header-height: 64px; --section-y: 88px; }
  body { font-size: 16px; line-height: 1.75; }
  .page-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); column-gap: 12px; }
  .site-header { min-height: var(--header-height); padding-block: 10px; gap: 16px; }
  .site-name { max-width: 165px; overflow: hidden; font-size: 12px; text-overflow: ellipsis; }
  .platform-shortcut { display: none; }
  .hero { min-height: max(600px, 78vh); }
  .hero__image { object-position: 62% 45%; }
  .hero__content { grid-template-rows: auto 1fr auto auto auto; padding-top: calc(var(--header-height) + 24px); padding-bottom: 22px; }
  .hero__eyebrow { grid-column: 1 / 5; }
  .hero h1 { grid-column: 1 / 5; margin-bottom: 18px; font-size: clamp(42px, 13vw, 64px); line-height: 1.05; }
  .hero__intro { grid-column: 1 / 5; margin: 0 0 30px; padding-right: 8%; font-size: 14px; }
  .continue-link { grid-column: 1 / 5; }
  .section-number { font-size: 78px; }
  .section-marker { grid-column: 1 / 2; display: block; }
  .section-marker h2 { margin-top: 30px; font-size: 16px; }
  .company__content { grid-column: 2 / 5; }
  .index-list > div { display: block; padding: 22px 0; }
  .index-list dt { margin-bottom: 8px; }
  .index-list dd { font-size: 20px; overflow-wrap: anywhere; }
  .index-list > div:last-child dd { font-size: 16px; }
  .editor-note { margin-top: 32px; font-size: 14px; }
  .platform__heading, .platform-entry { grid-column: 1 / 5; }
  .platform__heading .section-number { margin: 48px 0 24px; }
  .platform__heading h2 { font-size: 48px; }
  .platform__heading > p:last-child { margin-bottom: 48px; }
  .platform-entry { display: block; }
  .platform-entry__name, .platform-entry__operator, .platform-entry__intro { padding: 28px 22px; border-right: 0; border-top: 1px solid rgb(167 155 200 / 30%); }
  .platform-entry__name { border-top: 0; }
  .platform-entry h3 { font-size: 33px; }
  .platform-entry__intro p { font-size: 21px; }
  .scenarios__intro, .comparison { grid-column: 1 / 5; }
  .scenarios__intro .section-number { margin-bottom: 45px; }
  .scenarios__intro h2 { font-size: 38px; }
  .comparison { margin-top: 52px; }
  .comparison__head { display: none; }
  .comparison__row { display: block; padding: 27px 0 27px 42px; }
  .comparison__number { top: 30px; }
  .comparison__row strong::before, .comparison__row p::before { display: block; margin-bottom: 7px; color: var(--graphite-600); font-family: var(--sans); font-size: 11px; font-weight: 400; letter-spacing: .08em; }
  .comparison__row strong::before { content: "需求现象"; }
  .comparison__row p::before { margin-top: 20px; content: "建议先确认"; }
  .comparison__note { padding-left: 42px; }
  .collaboration__header .section-number { grid-column: 1 / 2; }
  .collaboration__header > div { grid-column: 2 / 5; }
  .collaboration h2 { margin-bottom: 60px; font-size: 38px; }
  .chapters::before { left: calc(var(--pad-x) + 15px); }
  .chapter--left, .chapter--right { grid-column: 1 / 5; grid-template-columns: 46px 1fr; gap: 16px; padding: 34px 0 34px 30px; }
  .chapter h3 { font-size: 29px; }
  .preparation__heading, .preparation__list, .safety-note { grid-column: 1 / 5; }
  .preparation__heading .section-kicker { margin-top: 45px; }
  .preparation__heading h2 { font-size: 40px; }
  .preparation__list { margin-top: 62px; }
  .safety-note { margin-top: 48px; padding: 28px; }
  .boundaries__header .section-number { grid-column: 1 / 2; }
  .boundaries__header > div { grid-column: 2 / 5; }
  .boundaries h2 { margin-bottom: 55px; font-size: 40px; }
  .boundary-table__head { display: none; }
  .boundary-table__head, .boundary-table__row { grid-column: 1 / 5; }
  .boundary-table__row { display: block; padding: 22px 0; }
  .boundary-table__row p { padding: 0; font-size: 17px; }
  .boundary-table__row p + p { margin-top: 22px; padding-top: 22px; border-top: 1px dashed #aaa69e; border-left: 0; }
  .boundary-table__row p::before { display: block; margin-bottom: 8px; color: var(--graphite-600); font-family: var(--sans); font-size: 11px; letter-spacing: .08em; }
  .boundary-table__row p:first-child::before { content: "本页可以确认"; }
  .boundary-table__row p:last-child::before { content: "本页不能替代"; }
  .site-footer { grid-template-columns: 1fr; gap: 10px; }
  .site-footer span:nth-child(2), .site-footer a { justify-self: start; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; }
}