:root {
  --yellow: #ffd91a;
  --coral: #ff6f61;
  --mint: #39bdb2;
  --ink: #202224;
  --muted: #676b6f;
  --paper: #ffffff;
  --canvas: #f3f5f4;
  --line: #d9dcda;
  --shell: 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; }
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button { font: inherit; }
.shell { width: min(var(--shell), calc(100% - 40px)); margin-inline: auto; }

.site-header { position: relative; z-index: 50; border-bottom: 2px solid var(--ink); background: rgba(255,255,255,.98); }
.header-inner { min-height: 74px; display: flex; align-items: center; justify-content: space-between; gap: 28px; }
.brand { display: inline-flex; align-items: center; gap: 11px; font-size: 20px; font-weight: 800; }
.brand img { width: 44px; height: 44px; object-fit: cover; border: 2px solid var(--ink); }
.site-nav { display: flex; align-items: center; gap: 30px; font-size: 15px; font-weight: 700; }
.site-nav > a:not(.nav-download) { position: relative; padding: 24px 0; }
.site-nav > a:not(.nav-download)::after { content: ""; position: absolute; left: 0; right: 100%; bottom: 17px; height: 3px; background: var(--coral); transition: right .2s ease; }
.site-nav > a.active::after, .site-nav > a:hover::after { right: 0; }
.nav-download { padding: 9px 18px; border: 2px solid var(--ink); background: var(--yellow); box-shadow: 4px 4px 0 var(--ink); }
.menu-toggle { display: none; width: 42px; height: 42px; padding: 9px; border: 2px solid var(--ink); background: var(--paper); }
.menu-toggle span { display: block; height: 2px; margin: 5px 0; background: var(--ink); }

.hero { overflow: hidden; border-bottom: 2px solid var(--ink); background: var(--canvas); }
.hero-inner { min-height: 624px; display: grid; grid-template-columns: minmax(0, .92fr) minmax(480px, 1.08fr); align-items: center; gap: 70px; padding-block: 38px 42px; }
.hero-copy { min-width: 0; }
.eyebrow { display: flex; gap: 10px; margin-bottom: 16px; }
.eyebrow span { padding: 3px 9px; border: 1px solid var(--ink); background: var(--paper); font-size: 12px; font-weight: 800; }
.eyebrow span:first-child { background: var(--yellow); }
h1, h2, h3, p { margin-top: 0; }
.hero h1 { max-width: 610px; margin-bottom: 18px; font-size: clamp(40px, 4.2vw, 64px); line-height: 1.08; letter-spacing: 0; }
.hero-copy > p { max-width: 620px; margin-bottom: 22px; color: #4d5154; font-size: 17px; }
.hero-actions { display: flex; align-items: center; gap: 22px; margin-bottom: 25px; }
.button { display: inline-flex; min-height: 48px; align-items: center; justify-content: center; padding: 11px 24px; border: 2px solid var(--ink); font-weight: 800; }
.button-primary { background: var(--yellow); box-shadow: 5px 5px 0 var(--ink); }
.button-dark { background: var(--ink); color: var(--paper); box-shadow: 5px 5px 0 rgba(255,255,255,.42); }
.text-link { border-bottom: 2px solid var(--ink); font-weight: 800; }
.hero-facts { display: grid; grid-template-columns: repeat(3, 1fr); margin: 0; border-top: 1px solid #bfc3c1; }
.hero-facts div { padding: 12px 12px 0 0; }
.hero-facts dt { color: var(--muted); font-size: 12px; font-weight: 800; }
.hero-facts dd { margin: 1px 0 0; font-size: 15px; font-weight: 800; }
.hero-media { position: relative; min-width: 0; height: 520px; }
.screen-window { position: absolute; right: 42px; top: 18px; z-index: 2; width: 273px; height: 484px; overflow: hidden; border: 3px solid var(--ink); background: var(--paper); box-shadow: 14px 14px 0 var(--coral); }
.screen-window img { width: 100%; height: 100%; object-fit: cover; object-position: top; }
.splash-tile { position: absolute; left: 20px; top: 100px; width: 235px; height: 300px; overflow: hidden; border: 3px solid var(--ink); background: var(--yellow); transform: rotate(-4deg); }
.splash-tile img { width: 100%; height: 100%; object-fit: cover; }
.bookmark-label { position: absolute; z-index: 4; padding: 7px 10px; border: 2px solid var(--ink); background: var(--paper); font-size: 12px; font-weight: 900; writing-mode: vertical-rl; }
.label-one { right: 0; top: 56px; background: var(--yellow); }
.label-two { left: 0; bottom: 78px; background: var(--mint); }
.hero-index { position: absolute; right: 25px; bottom: 0; z-index: 3; font-size: 12px; font-weight: 900; }

.section { padding: 72px 0; }
.section-heading { display: flex; align-items: baseline; gap: 18px; margin-bottom: 34px; }
.section-number { color: var(--coral); font-size: 14px; font-weight: 900; }
.section-heading h2, .flow-title h2, .faq-intro h2 { margin: 0; font-size: clamp(30px, 3vw, 44px); line-height: 1.15; letter-spacing: 0; }
.feature-grid { display: grid; grid-template-columns: repeat(12, minmax(0,1fr)); border: 2px solid var(--ink); }
.feature { min-width: 0; min-height: 220px; padding: 24px; border-right: 2px solid var(--ink); }
.feature:nth-child(1), .feature:nth-child(4) { grid-column: span 4; }
.feature:nth-child(2), .feature:nth-child(3) { grid-column: span 2; }
.feature:last-child { border-right: 0; }
.feature-yellow { background: var(--yellow); }
.feature-coral { background: var(--coral); }
.feature-mint { background: var(--mint); }
.feature-ink { background: var(--ink); color: var(--paper); }
.feature-mark { display: inline-grid; width: 34px; height: 34px; place-items: center; margin-bottom: 26px; border: 2px solid currentColor; font-weight: 900; }
.feature h3 { margin-bottom: 8px; font-size: 22px; line-height: 1.25; }
.feature p { margin-bottom: 0; font-size: 14px; }

.gallery-band { background: var(--ink); color: var(--paper); }
.heading-light .section-number { color: var(--yellow); }
.gallery-grid { display: grid; grid-template-columns: 1.08fr .84fr 1.08fr; align-items: end; gap: 24px; }
.gallery-item { min-width: 0; margin: 0; }
.image-stage { display: flex; height: 488px; align-items: flex-start; justify-content: center; overflow: hidden; border: 2px solid var(--paper); background: #303336; }
.gallery-short .image-stage { height: 420px; }
.image-stage img { width: auto; max-width: 400px; height: 100%; object-fit: contain; }
.launch-stage { background: var(--yellow); }
.gallery-item figcaption { display: grid; gap: 3px; padding-top: 14px; border-top: 6px solid var(--yellow); }
.gallery-item:nth-child(2) figcaption { border-color: var(--coral); }
.gallery-item:nth-child(3) figcaption { border-color: var(--mint); }
.gallery-item figcaption b { font-size: 18px; }
.gallery-item figcaption span { color: #c7cac8; font-size: 14px; }

.collection-flow { background: var(--canvas); }
.flow-layout { display: grid; grid-template-columns: .7fr 1.3fr; gap: 80px; }
.flow-title > .section-note { margin: 20px 0 0; color: var(--muted); }
.flow-list { margin: 0; padding: 0; border-top: 2px solid var(--ink); list-style: none; }
.flow-list li { display: grid; grid-template-columns: 70px 1fr; gap: 22px; padding: 20px 0; border-bottom: 2px solid var(--ink); }
.flow-list li > span { color: var(--coral); font-size: 20px; font-weight: 900; }
.flow-list h3 { margin-bottom: 4px; }
.flow-list p { margin-bottom: 0; color: var(--muted); }
.deep-links { padding-top: 0; background: var(--canvas); }
.deep-grid { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 20px; }
.deep-panel { min-width: 0; padding: 34px; border: 2px solid var(--ink); }
.panel-yellow { background: var(--yellow); }
.panel-coral { background: var(--coral); }
.panel-tag, .download-kicker, .page-code, .step-label { display: block; margin-bottom: 12px; font-size: 12px; font-weight: 900; }
.deep-panel h2 { margin-bottom: 8px; font-size: 28px; }
.deep-panel .section-note { margin-bottom: 16px; }
.deep-panel a { display: inline-block; border-bottom: 2px solid var(--ink); font-weight: 900; }

.download-band { padding: 46px 0; border-block: 2px solid var(--ink); background: var(--mint); }
.download-inner { display: flex; align-items: center; justify-content: space-between; gap: 40px; }
.download-inner h2 { margin-bottom: 6px; font-size: clamp(28px, 3vw, 42px); line-height: 1.15; }
.download-inner p, .download-inner .section-note { max-width: 720px; margin-bottom: 0; }
.site-footer { padding: 28px 0; background: var(--ink); color: var(--paper); }
.footer-inner { text-align: center; }
.copyright { margin-bottom: 8px; font-weight: 800; }
.site-footer nav { display: flex; justify-content: center; gap: 24px; margin-bottom: 14px; font-size: 14px; }
.disclaimer { margin: 0; color: #bfc3c1; font-size: 13px; text-align: center; }

.inner-hero { border-bottom: 2px solid var(--ink); background: var(--canvas); }
.inner-hero-grid { min-height: 470px; display: grid; grid-template-columns: 1fr 380px; align-items: center; gap: 90px; padding-block: 52px; }
.inner-hero h1 { max-width: 720px; margin-bottom: 18px; font-size: clamp(38px, 4.6vw, 64px); line-height: 1.08; letter-spacing: 0; }
.inner-hero p { max-width: 680px; color: #4d5154; font-size: 17px; }
.guide-poster, .faq-poster { position: relative; height: 330px; display: flex; flex-direction: column; justify-content: space-between; padding: 26px; border: 3px solid var(--ink); box-shadow: 14px 14px 0 var(--ink); }
.guide-poster { background: var(--yellow); }
.faq-poster { background: var(--coral); }
.guide-poster > span, .faq-poster > span { font-size: 13px; font-weight: 900; }
.guide-poster strong { font-size: 48px; line-height: 1.08; }
.guide-poster small, .faq-poster small { font-weight: 800; }
.faq-poster strong { align-self: flex-end; font-size: 150px; line-height: .8; }

.article-section { padding: 72px 0; }
.article-layout { display: grid; grid-template-columns: 230px minmax(0, 780px); justify-content: space-between; gap: 64px; }
.article-index { position: sticky; top: 22px; align-self: start; display: grid; border-top: 2px solid var(--ink); }
.article-index span { padding: 10px 0; color: var(--coral); font-size: 12px; font-weight: 900; }
.article-index a { padding: 9px 0; border-top: 1px solid var(--line); font-weight: 700; }
.prose section { scroll-margin-top: 24px; padding-bottom: 42px; margin-bottom: 42px; border-bottom: 2px solid var(--ink); }
.prose section:last-child { margin-bottom: 0; }
.prose h2 { margin-bottom: 16px; font-size: 30px; line-height: 1.25; }
.prose p { color: #474b4e; }
.prose p:last-child { margin-bottom: 0; }
.prose a { border-bottom: 2px solid var(--coral); font-weight: 800; }

.faq-section { padding: 72px 0; }
.faq-layout { display: grid; grid-template-columns: 330px minmax(0, 1fr); gap: 70px; }
.faq-intro { align-self: start; position: sticky; top: 22px; }
.faq-intro p { color: var(--muted); }
.faq-intro a { border-bottom: 2px solid var(--ink); font-weight: 800; }
.accordion { border-top: 2px solid var(--ink); }
.faq-item { border-bottom: 2px solid var(--ink); }
.faq-item button { width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 20px 0; border: 0; background: transparent; color: var(--ink); text-align: left; cursor: pointer; }
.faq-item button span { display: flex; align-items: baseline; gap: 18px; font-size: 18px; font-weight: 800; }
.faq-item button b { color: var(--coral); font-size: 13px; }
.faq-item button i { flex: 0 0 30px; font-size: 25px; font-style: normal; text-align: center; }
.faq-answer { padding: 0 42px 18px 47px; color: var(--muted); }
.faq-answer p { margin: 0; }
.support-band { padding: 60px 0; background: var(--yellow); }
.support-grid { display: grid; grid-template-columns: .7fr 1.3fr; gap: 80px; }
.support-grid h2 { font-size: 38px; line-height: 1.2; }
.support-steps { border-top: 2px solid var(--ink); }
.support-steps p { display: grid; grid-template-columns: 170px 1fr; gap: 20px; margin: 0; padding: 14px 0; border-bottom: 2px solid var(--ink); }

@media (max-width: 960px) {
  .hero-inner { grid-template-columns: minmax(0, 1fr) 440px; gap: 30px; }
  .hero-media { transform: scale(.9); transform-origin: center right; }
  .feature:nth-child(n) { grid-column: span 6; border-bottom: 2px solid var(--ink); }
  .feature:nth-child(even) { border-right: 0; }
  .feature:nth-last-child(-n+2) { border-bottom: 0; }
  .inner-hero-grid { grid-template-columns: 1fr 300px; gap: 50px; }
  .article-layout, .faq-layout { grid-template-columns: 200px minmax(0, 1fr); gap: 40px; }
}

@media (max-width: 760px) {
  .shell { width: min(100% - 28px, var(--shell)); }
  .header-inner { min-height: 62px; }
  .brand img { width: 38px; height: 38px; }
  .brand span { font-size: 18px; }
  .menu-toggle { display: block; }
  .site-nav { position: absolute; left: 14px; right: 14px; top: 62px; display: none; padding: 12px; border: 2px solid var(--ink); background: var(--paper); box-shadow: 6px 6px 0 var(--ink); }
  .site-nav.open { display: grid; }
  .site-nav > a:not(.nav-download) { padding: 9px; }
  .site-nav > a:not(.nav-download)::after { display: none; }
  .nav-download { text-align: center; box-shadow: none; }
  .hero-inner { min-height: auto; grid-template-columns: 1fr; gap: 20px; padding-block: 28px 30px; }
  .hero h1 { max-width: 360px; margin-bottom: 12px; font-size: 39px; }
  .hero-copy > p { margin-bottom: 16px; font-size: 15px; line-height: 1.65; }
  .hero-actions { margin-bottom: 18px; }
  .hero-facts { display: none; }
  .hero-media { width: 100%; height: 300px; transform: none; }
  .screen-window { right: 22px; top: 0; width: 170px; height: 292px; box-shadow: 8px 8px 0 var(--coral); }
  .splash-tile { left: 24px; top: 38px; width: 165px; height: 218px; }
  .label-one { right: 0; top: 22px; }
  .label-two { left: 0; bottom: 22px; }
  .hero-index { display: none; }
  .section { padding: 52px 0; }
  .section-heading { margin-bottom: 24px; }
  .feature-grid { grid-template-columns: 1fr; }
  .feature:nth-child(n) { min-height: 0; grid-column: auto; padding: 22px; border-right: 0; border-bottom: 2px solid var(--ink); }
  .feature:last-child { border-bottom: 0; }
  .feature-mark { margin-bottom: 12px; }
  .gallery-grid { grid-template-columns: 1fr; gap: 40px; }
  .gallery-item, .gallery-short { display: grid; grid-template-columns: minmax(0, 190px) 1fr; align-items: end; gap: 18px; }
  .image-stage, .gallery-short .image-stage { width: 100%; height: 330px; }
  .gallery-item figcaption { min-width: 0; }
  .flow-layout, .deep-grid, .support-grid { grid-template-columns: 1fr; gap: 32px; }
  .flow-list li { grid-template-columns: 48px 1fr; gap: 12px; }
  .deep-panel { padding: 26px; }
  .download-inner { align-items: flex-start; flex-direction: column; gap: 22px; }
  .download-inner .button { width: 100%; }
  .inner-hero-grid { min-height: 0; grid-template-columns: 1fr; gap: 28px; padding-block: 36px; }
  .inner-hero h1 { font-size: 40px; }
  .guide-poster, .faq-poster { width: min(100%, 330px); height: 235px; justify-self: end; }
  .guide-poster strong { font-size: 34px; }
  .faq-poster strong { font-size: 96px; }
  .article-section, .faq-section { padding: 52px 0; }
  .article-layout, .faq-layout { grid-template-columns: 1fr; gap: 36px; }
  .article-index, .faq-intro { position: static; }
  .article-index { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .article-index span { grid-column: 1 / -1; }
  .article-index a { min-width: 0; padding-right: 8px; }
  .faq-item button span { gap: 10px; font-size: 16px; }
  .faq-answer { padding-left: 30px; padding-right: 8px; }
  .support-steps p { grid-template-columns: 1fr; gap: 2px; }
}

@media (max-width: 430px) {
  .hero h1 { max-width: 350px; font-size: 34px; }
  .hero-actions { align-items: flex-start; flex-direction: column; gap: 14px; }
  .button { min-height: 44px; padding: 9px 20px; }
  .hero-media { height: 238px; }
  .screen-window { width: 136px; height: 234px; }
  .splash-tile { left: 14px; top: 27px; width: 142px; height: 186px; }
  .inner-hero h1 { font-size: 34px; }
  .gallery-item, .gallery-short { grid-template-columns: minmax(0, 165px) 1fr; gap: 14px; }
  .image-stage, .gallery-short .image-stage { height: 290px; }
  .gallery-item figcaption span { font-size: 13px; }
  .site-footer nav { flex-wrap: wrap; gap: 10px 20px; }
}