:root {
  --ink: #111111;
  --paper: #f7f7f3;
  --white: #ffffff;
  --line: #1b1b1b;
  --muted: #60605c;
  --blue: #1858d8;
  --yellow: #f4c900;
  --green: #208b57;
  --soft-blue: #e9efff;
  --soft-green: #e9f5ec;
  --radius: 4px;
  --max: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "微软雅黑", Arial, Helvetica, sans-serif;
  line-height: 1.7;
  letter-spacing: 0;
}
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button, input { font: inherit; }
button { color: inherit; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  border-bottom: 1px solid var(--line);
  background: rgba(247, 247, 243, 0.96);
  backdrop-filter: blur(12px);
}
.header-inner {
  width: min(var(--max), calc(100% - 40px));
  min-height: 74px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
}
.brand { display: inline-flex; align-items: center; gap: 11px; font-size: 21px; font-weight: 800; line-height: 1; }
.brand img { border: 1px solid var(--line); border-radius: 3px; }
.site-nav { display: flex; align-items: center; gap: 30px; font-size: 14px; font-weight: 650; }
.site-nav a { position: relative; padding: 24px 0 21px; }
.site-nav a:not(.download-link)::after { content: ""; position: absolute; right: 0; bottom: 15px; left: 0; height: 2px; background: var(--blue); transform: scaleX(0); transform-origin: left; transition: transform .2s ease; }
.site-nav a:hover::after, .site-nav a.active::after { transform: scaleX(1); }
.site-nav .download-link { min-width: 94px; padding: 10px 18px; border: 1px solid var(--line); background: var(--yellow); text-align: center; }
.menu-toggle { display: none; width: 42px; height: 42px; border: 1px solid var(--line); background: var(--white); font-size: 22px; line-height: 1; cursor: pointer; }

.section-inner, .hero-inner, .footer-inner { width: min(var(--max), calc(100% - 40px)); margin: 0 auto; }
.hero { border-bottom: 1px solid var(--line); background: var(--white); }
.hero-inner { min-height: 574px; padding: 48px 0 50px; display: grid; grid-template-columns: minmax(0, 1.06fr) minmax(450px, .94fr); align-items: center; gap: 78px; }
.eyebrow { display: flex; gap: 10px; margin-bottom: 18px; font-family: Consolas, "Courier New", monospace; font-size: 11px; font-weight: 700; }
.eyebrow span { padding: 4px 8px; border: 1px solid var(--line); background: var(--white); }
.eyebrow span:first-child { background: var(--yellow); }
h1, h2, h3, p { margin-top: 0; }
.hero h1 { margin-bottom: 20px; font-size: clamp(48px, 5vw, 70px); line-height: 1.02; font-weight: 850; }
.hero h1 span { display: block; color: var(--blue); }
.hero-copy > p { max-width: 650px; margin-bottom: 26px; color: #343432; font-size: 17px; line-height: 1.9; }
.hero-actions { display: flex; align-items: center; gap: 23px; }
.button { display: inline-flex; min-width: 126px; min-height: 48px; align-items: center; justify-content: center; padding: 10px 22px; border: 1px solid var(--line); border-radius: 2px; font-size: 15px; font-weight: 800; transition: transform .18s ease, box-shadow .18s ease; }
.button:hover { transform: translate(-2px, -2px); box-shadow: 4px 4px 0 var(--ink); }
.button-primary { background: var(--blue); color: var(--white); }
.text-link { padding-bottom: 2px; border-bottom: 1px solid var(--line); font-size: 14px; font-weight: 750; }
.hero-facts { display: grid; grid-template-columns: repeat(3, 1fr); margin: 34px 0 0; border-top: 1px solid var(--line); }
.hero-facts div { padding: 15px 10px 0 0; }
.hero-facts dt { color: var(--muted); font-size: 11px; }
.hero-facts dd { margin: 2px 0 0; font-size: 13px; font-weight: 750; }
.hero-media { position: relative; min-width: 0; padding: 34px 0 32px 46px; }
.media-index { position: absolute; top: 0; left: 0; z-index: 2; width: 124px; border: 1px solid var(--line); background: var(--yellow); }
.media-index span { display: block; padding: 8px 10px; border-bottom: 1px solid var(--line); font-size: 11px; font-weight: 800; }
.media-index span:last-child { border-bottom: 0; }
.screen-stage { position: relative; padding: 16px; border: 1px solid var(--line); background: var(--soft-blue); box-shadow: 12px 12px 0 var(--green); }
.screen-caption { display: flex; justify-content: space-between; gap: 15px; margin: 0 0 12px; font-size: 11px; }
.screen-caption span { color: var(--muted); }
.screen-stage img { width: min(400px, 100%); margin: 0 auto; border: 1px solid #888; background: var(--white); }
.series-strip { display: grid; grid-template-columns: 1.3fr 1fr 1fr; margin: 23px 0 0 20px; border: 1px solid var(--line); background: var(--white); font-family: Consolas, "Courier New", monospace; font-size: 10px; font-weight: 700; }
.series-strip span { padding: 7px 9px; border-right: 1px solid var(--line); }
.series-strip span:last-child { border-right: 0; background: var(--yellow); }

.route-band { border-bottom: 1px solid var(--line); background: var(--yellow); }
.route-band .section-inner { min-height: 153px; display: grid; grid-template-columns: 62px 230px 1fr; align-items: center; gap: 22px; }
.section-number { font-family: Consolas, "Courier New", monospace; font-size: 13px; font-weight: 800; }
.route-band h2 { margin: 0; font-size: 28px; line-height: 1.25; }
.route-list { display: grid; grid-template-columns: repeat(3, 1fr); margin: 0; padding: 0; border-left: 1px solid var(--line); list-style: none; }
.route-list li { min-height: 86px; padding: 13px 20px; border-right: 1px solid var(--line); }
.route-list span { display: block; color: #444; font-size: 11px; }
.route-list strong { display: block; margin-top: 4px; font-size: 14px; line-height: 1.55; }

.section-pad { padding: 88px 0; border-bottom: 1px solid var(--line); }
.section-heading { display: flex; align-items: baseline; gap: 18px; margin-bottom: 34px; }
.section-heading h2 { margin: 0; font-size: 36px; line-height: 1.2; }
.feature-grid { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.feature-grid article { min-height: 275px; padding: 26px 23px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); background: var(--white); }
.feature-grid article:nth-child(2) { background: var(--soft-blue); }
.feature-grid article:nth-child(3) { background: var(--soft-green); }
.feature-grid article:nth-child(4) { background: #fff9d9; }
.feature-code { font-family: Consolas, "Courier New", monospace; color: var(--blue); font-size: 11px; font-weight: 800; }
.feature-grid h3 { margin: 56px 0 12px; font-size: 20px; line-height: 1.35; }
.feature-grid p { margin-bottom: 0; color: #41413e; font-size: 14px; }

.gallery { background: var(--ink); color: var(--white); }
.gallery-layout { display: grid; grid-template-columns: minmax(320px, .78fr) minmax(500px, 1.22fr); gap: 75px; align-items: center; }
.gallery .section-number { color: var(--yellow); }
.gallery-tabs { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 34px; }
.gallery-tab { min-width: 92px; padding: 8px 14px; border: 1px solid #777; background: transparent; color: var(--white); cursor: pointer; }
.gallery-tab.active { border-color: var(--yellow); background: var(--yellow); color: var(--ink); font-weight: 800; }
.gallery-notes { border-top: 1px solid #666; }
.gallery-notes div { display: grid; grid-template-columns: 30px 1fr; gap: 12px; padding: 14px 0; border-bottom: 1px solid #555; }
.gallery-notes span { color: var(--yellow); font-family: Consolas, "Courier New", monospace; font-weight: 800; }
.gallery-notes p { margin: 0; color: #d2d2ce; font-size: 13px; }
.gallery-viewer { min-height: 314px; display: grid; align-items: center; padding: 38px; border: 1px solid #777; background: #202020; }
.gallery-panel { margin: 0; }
.gallery-panel img { width: min(400px, 100%); margin: 0 auto; border: 1px solid #bbb; background: var(--white); }
.gallery-panel figcaption { margin-top: 18px; color: #d4d4d0; font-size: 12px; text-align: center; }

.deep-links { background: var(--white); }
.link-rows { border-top: 1px solid var(--line); }
.link-rows a { display: grid; grid-template-columns: 54px minmax(220px, 1.6fr) minmax(180px, 1fr) 34px; align-items: center; gap: 15px; min-height: 102px; border-bottom: 1px solid var(--line); transition: background .18s ease; }
.link-rows a:hover { background: var(--yellow); }
.link-rows > a > span { font-family: Consolas, "Courier New", monospace; font-size: 12px; }
.link-rows strong { font-size: 20px; }
.link-rows em { color: var(--muted); font-size: 13px; font-style: normal; }
.link-rows b { font-size: 24px; text-align: right; }
.faq-preview { background: var(--soft-blue); }
.faq-preview-grid { display: grid; grid-template-columns: .7fr 1.3fr; gap: 70px; }
.question-list { border-top: 1px solid var(--line); }
.question-list a { display: flex; min-height: 76px; align-items: center; justify-content: space-between; gap: 20px; border-bottom: 1px solid var(--line); font-weight: 700; }
.question-list b { padding: 4px 9px; border: 1px solid var(--line); background: var(--white); font-size: 11px; }

.final-action { padding: 48px 0; background: var(--blue); color: var(--white); }
.final-action-inner { display: flex; align-items: center; justify-content: space-between; gap: 30px; }
.final-action span { font-family: Consolas, "Courier New", monospace; font-size: 11px; }
.final-action h2 { max-width: 700px; margin: 5px 0 0; font-size: 30px; line-height: 1.3; }
.button-light { background: var(--yellow); color: var(--ink); }

.site-footer { padding: 48px 0 38px; border-top: 1px solid var(--line); background: var(--paper); text-align: center; }
.footer-inner { display: flex; flex-direction: column; align-items: center; }
.footer-brand { margin-bottom: 22px; }
.footer-links { display: flex; flex-wrap: wrap; justify-content: center; gap: 24px; margin-bottom: 20px; font-size: 13px; font-weight: 700; }
.site-footer p { max-width: 760px; margin: 0 auto 10px; color: var(--muted); font-size: 12px; text-align: center; }
.site-footer small { color: #777; font-size: 11px; text-align: center; }

.page-hero { border-bottom: 1px solid var(--line); background: var(--white); }
.page-hero-inner { min-height: 410px; padding: 70px 0; display: grid; grid-template-columns: 1.25fr .75fr; align-items: center; gap: 80px; }
.page-kicker { display: inline-block; margin-bottom: 16px; padding: 4px 8px; border: 1px solid var(--line); background: var(--yellow); font-family: Consolas, "Courier New", monospace; font-size: 11px; font-weight: 800; }
.page-hero h1 { margin-bottom: 18px; font-size: 52px; line-height: 1.1; }
.page-hero p { max-width: 690px; margin-bottom: 0; color: #444; font-size: 16px; }
.page-index { display: grid; grid-template-columns: 1fr 1fr; border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.page-index span { padding: 24px 18px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); font-family: Consolas, "Courier New", monospace; font-size: 13px; font-weight: 800; }
.page-index span:nth-child(1) { background: var(--yellow); }
.page-index span:nth-child(2) { background: var(--soft-blue); }
.page-index span:nth-child(3) { background: var(--soft-green); }
.page-index span:nth-child(4) { background: var(--ink); color: var(--white); }

.article-grid { display: grid; grid-template-columns: 210px minmax(0, 760px); justify-content: space-between; gap: 80px; }
.article-nav { position: sticky; top: 105px; align-self: start; border-top: 3px solid var(--line); }
.article-nav strong, .article-nav a { display: block; padding: 10px 0; border-bottom: 1px solid #b7b7b1; font-size: 13px; }
.article-nav strong { padding-top: 15px; }
.article-nav a:hover { color: var(--blue); }
.article-content > section { scroll-margin-top: 100px; padding: 0 0 55px; margin-bottom: 54px; border-bottom: 1px solid var(--line); }
.step-label { color: var(--blue); font-family: Consolas, "Courier New", monospace; font-size: 11px; font-weight: 800; }
.article-content h2 { margin: 7px 0 20px; font-size: 32px; line-height: 1.35; }
.article-content p { color: #353532; font-size: 15px; line-height: 2; }
.article-content p a { color: var(--blue); text-decoration: underline; text-underline-offset: 3px; }
.checklist { margin-top: 24px; border-top: 1px solid var(--line); }
.checklist div { display: grid; grid-template-columns: 110px 1fr; gap: 20px; padding: 14px 0; border-bottom: 1px solid var(--line); }
.checklist b { font-size: 13px; }
.checklist span { color: var(--muted); font-size: 13px; }
.article-figure { margin: 28px 0 0; padding: 30px; border: 1px solid var(--line); background: var(--soft-blue); }
.article-figure img { width: min(400px, 100%); margin: 0 auto; border: 1px solid #888; }
.article-figure figcaption { margin-top: 12px; color: var(--muted); font-size: 12px; text-align: center; }
.article-action { display: flex; align-items: center; justify-content: space-between; gap: 25px; padding: 25px; border: 1px solid var(--line); background: var(--yellow); }
.article-action strong, .article-action span { display: block; }
.article-action span { color: #444; font-size: 12px; }

.faq-hero .page-hero-inner { min-height: 370px; }
.issue-key { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.issue-key span { display: flex; align-items: center; gap: 10px; padding: 14px; border: 1px solid var(--line); font-weight: 750; }
.dot { width: 13px; height: 13px; display: inline-block; border: 1px solid var(--line); border-radius: 50%; }
.dot.blue { background: var(--blue); }.dot.yellow { background: var(--yellow); }.dot.green { background: var(--green); }.dot.black { background: var(--ink); }
.faq-layout { display: grid; grid-template-columns: 180px minmax(0, 850px); justify-content: space-between; gap: 75px; }
.faq-filter { position: sticky; top: 105px; align-self: start; border-top: 3px solid var(--line); }
.faq-filter strong { display: block; padding: 12px 0; border-bottom: 1px solid var(--line); }
.filter-button { width: 100%; padding: 11px 5px; border: 0; border-bottom: 1px solid #b7b7b1; background: transparent; text-align: left; cursor: pointer; }
.filter-button.active { padding-left: 11px; background: var(--yellow); font-weight: 800; }
.faq-intro { margin-bottom: 30px; }
.faq-intro > span { color: var(--blue); font-family: Consolas, "Courier New", monospace; font-size: 11px; font-weight: 800; }
.faq-intro h2 { margin: 5px 0 8px; font-size: 34px; }
.faq-intro p { max-width: 670px; margin-bottom: 0; color: var(--muted); }
.accordion-list { border-top: 1px solid var(--line); }
.faq-item { border-bottom: 1px solid var(--line); }
.faq-question { width: 100%; min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 14px 4px; border: 0; background: transparent; text-align: left; cursor: pointer; }
.faq-question > span { display: flex; align-items: baseline; gap: 16px; font-size: 16px; font-weight: 750; }
.faq-question b { color: var(--blue); font-family: Consolas, "Courier New", monospace; font-size: 11px; }
.faq-question i { min-width: 28px; font-size: 24px; font-style: normal; text-align: center; }
.faq-answer { padding: 0 48px 24px; }
.faq-answer p { margin-bottom: 0; color: #444; font-size: 14px; line-height: 2; }
.faq-answer a { color: var(--blue); text-decoration: underline; }
.faq-bottom { display: flex; align-items: center; justify-content: space-between; gap: 25px; margin-top: 38px; padding: 22px; border: 1px solid var(--line); background: var(--soft-green); }
.faq-bottom strong, .faq-bottom span { display: block; }
.faq-bottom > div span { color: var(--muted); font-size: 12px; }
.faq-bottom > a { font-size: 14px; font-weight: 800; }

@media (max-width: 980px) {
  .hero-inner { grid-template-columns: minmax(0, 1fr) minmax(380px, .9fr); gap: 40px; }
  .hero h1 { font-size: 50px; }
  .route-band .section-inner { grid-template-columns: 50px 190px 1fr; }
  .feature-grid { grid-template-columns: 1fr 1fr; }
  .gallery-layout { grid-template-columns: .8fr 1.2fr; gap: 40px; }
  .article-grid, .faq-layout { grid-template-columns: 160px minmax(0, 1fr); gap: 45px; }
}

@media (max-width: 760px) {
  .header-inner { width: min(100% - 28px, var(--max)); min-height: 64px; }
  .brand { font-size: 19px; }.brand img { width: 42px; height: 42px; }
  .menu-toggle { display: inline-grid; place-items: center; }
  .site-nav { position: absolute; top: 64px; right: 0; left: 0; display: none; padding: 12px 14px 18px; border-bottom: 1px solid var(--line); background: var(--paper); box-shadow: 0 14px 24px rgba(0,0,0,.12); }
  .site-nav.open { display: grid; }
  .site-nav a { padding: 11px 8px; border-bottom: 1px solid #c9c9c2; }
  .site-nav a:not(.download-link)::after { display: none; }
  .site-nav .download-link { margin-top: 5px; }
  .section-inner, .hero-inner, .footer-inner { width: min(100% - 28px, var(--max)); }
  .hero-inner { min-height: 0; padding: 30px 0 34px; grid-template-columns: 1fr; gap: 26px; }
  .hero-copy { order: 1; }.hero-media { order: 2; }
  .eyebrow { margin-bottom: 13px; }
  .hero h1 { margin-bottom: 14px; font-size: 42px; line-height: 1.05; }
  .hero-copy > p { margin-bottom: 19px; font-size: 14px; line-height: 1.75; }
  .hero-actions { gap: 16px; }
  .hero-facts { margin-top: 22px; }
  .hero-facts div { padding-top: 10px; }.hero-facts dt { font-size: 10px; }.hero-facts dd { font-size: 11px; }
  .hero-media { padding: 25px 0 21px 25px; }
  .media-index { width: 98px; }.media-index span { padding: 5px 7px; font-size: 9px; }
  .screen-stage { padding: 11px; box-shadow: 7px 7px 0 var(--green); }
  .screen-caption { margin-bottom: 8px; font-size: 9px; }
  .series-strip { margin: 14px 0 0 10px; font-size: 8px; }
  .series-strip span { padding: 5px; }
  .route-band .section-inner { padding: 24px 0; display: block; }
  .route-band .section-number { display: block; margin-bottom: 5px; }
  .route-band h2 { margin-bottom: 18px; font-size: 24px; }
  .route-list { grid-template-columns: 1fr; border-top: 1px solid var(--line); }
  .route-list li { min-height: 0; border-bottom: 1px solid var(--line); }
  .section-pad { padding: 60px 0; }
  .section-heading { margin-bottom: 26px; }.section-heading h2 { font-size: 30px; }
  .feature-grid { grid-template-columns: 1fr; }
  .feature-grid article { min-height: 0; padding: 22px; }
  .feature-grid h3 { margin-top: 26px; }
  .gallery-layout { grid-template-columns: 1fr; gap: 32px; }
  .gallery-viewer { min-height: 0; padding: 18px; }
  .link-rows a { grid-template-columns: 35px 1fr 24px; gap: 10px; min-height: 94px; }
  .link-rows strong { font-size: 16px; }.link-rows em { display: none; }
  .faq-preview-grid { grid-template-columns: 1fr; gap: 5px; }
  .question-list a { font-size: 14px; }
  .final-action-inner { align-items: flex-start; flex-direction: column; }
  .final-action h2 { font-size: 25px; }
  .page-hero-inner { min-height: 0; padding: 45px 0; grid-template-columns: 1fr; gap: 35px; }
  .page-hero h1 { font-size: 40px; }
  .article-grid, .faq-layout { grid-template-columns: 1fr; gap: 42px; }
  .article-nav, .faq-filter { position: static; }
  .article-nav { display: grid; grid-template-columns: 1fr 1fr; }
  .article-nav strong { grid-column: 1 / -1; }
  .article-nav a:nth-child(even) { border-right: 1px solid #b7b7b1; }
  .article-nav a { padding: 10px; }
  .article-content h2 { font-size: 27px; }
  .article-figure { padding: 14px; }
  .article-action, .faq-bottom { align-items: flex-start; flex-direction: column; }
  .faq-filter { display: flex; flex-wrap: wrap; border-bottom: 1px solid var(--line); }
  .faq-filter strong { width: 100%; }
  .filter-button { width: auto; min-width: 66px; padding: 9px 12px; border-right: 1px solid #b7b7b1; border-bottom: 0; }
  .faq-answer { padding-right: 6px; padding-left: 6px; }
}

@media (max-width: 430px) {
  .hero-inner { padding-top: 22px; padding-bottom: 22px; gap: 18px; }
  .hero h1 { font-size: 38px; }
  .hero-actions { align-items: center; flex-direction: row; }
  .hero-actions .button { width: auto; }
  .article-action .button, .final-action .button { width: 100%; }
  .hero-facts { grid-template-columns: 1fr 1fr; }
  .hero-facts div:last-child { grid-column: 1 / -1; }
  .hero-media { padding-left: 18px; }
  .screen-caption span { display: none; }
  .page-hero h1 { font-size: 32px; }
  .page-index { grid-template-columns: 1fr; }
  .page-index span { padding: 14px; }
  .checklist div { grid-template-columns: 1fr; gap: 4px; }
  .faq-question > span { gap: 9px; font-size: 14px; }
}