:root {
  --ink: #101820;
  --paper: #ffffff;
  --mist: #eef3f6;
  --cyan: #22d3ee;
  --orange: #ff7a1a;
  --violet: #6956e8;
  --muted: #60707a;
  --line: #cbd7dd;
}

* { 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; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
button, a { -webkit-tap-highlight-color: transparent; }
.shell { width: min(1180px, calc(100% - 40px)); margin: 0 auto; }

.site-header { position: sticky; top: 0; z-index: 30; background: rgba(255,255,255,.96); border-bottom: 1px solid var(--line); backdrop-filter: blur(12px); }
.header-inner { width: min(1180px, calc(100% - 40px)); min-height: 72px; margin: 0 auto; display: flex; align-items: center; justify-content: space-between; gap: 28px; }
.brand { display: inline-flex; align-items: center; gap: 11px; font-weight: 800; font-size: 18px; }
.brand img { width: 42px; height: 42px; border: 1px solid var(--ink); }
.site-nav { display: flex; align-items: center; gap: 28px; font-size: 14px; font-weight: 700; }
.site-nav a { padding: 10px 0; border-bottom: 2px solid transparent; }
.site-nav a.active { border-color: var(--orange); }
.site-nav .nav-download { padding: 9px 16px; color: var(--paper); background: var(--ink); border: 1px solid var(--ink); }
.menu-toggle { display: none; width: 42px; height: 42px; padding: 10px; background: var(--paper); border: 1px solid var(--ink); }
.menu-toggle span { display: block; height: 2px; margin: 4px 0; background: var(--ink); }

.hero { background: linear-gradient(90deg, var(--paper) 0 62%, var(--mist) 62% 100%); border-bottom: 1px solid var(--line); }
.hero-grid { min-height: 610px; padding: 46px 0 50px; display: grid; grid-template-columns: minmax(0, 1.03fr) minmax(400px, .97fr); align-items: center; gap: 62px; }
.eyebrow, .media-label, .page-code { display: flex; align-items: center; gap: 15px; font-size: 12px; font-weight: 800; letter-spacing: 0; text-transform: uppercase; }
.eyebrow span:first-child { padding: 5px 9px; color: var(--paper); background: var(--violet); }
.hero h1 { margin: 22px 0 18px; font-size: 58px; line-height: 1.08; letter-spacing: 0; }
.hero h1 span { display: block; }
.hero h1 span:last-child { color: var(--violet); }
.hero-copy > p { max-width: 640px; margin: 0; color: #42515a; font-size: 17px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.button { display: inline-flex; min-height: 46px; align-items: center; justify-content: center; padding: 9px 21px; border: 1px solid var(--ink); font-weight: 800; transition: transform .18s ease, background .18s ease; }
.button:hover { transform: translateY(-2px); }
.button.primary { color: var(--ink); background: var(--cyan); box-shadow: 5px 5px 0 var(--ink); }
.button.secondary { background: var(--paper); }
.signal-list { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); margin: 34px 0 0; border-top: 1px solid var(--line); }
.signal-list div { min-width: 0; padding: 15px 12px 0 0; }
.signal-list dt { color: var(--orange); font-size: 12px; font-weight: 900; }
.signal-list dd { margin: 2px 0 0; font-size: 13px; font-weight: 700; }
.hero-media { position: relative; min-height: 490px; padding: 18px 22px 16px; display: grid; grid-template-rows: auto 1fr auto; background: var(--ink); color: var(--paper); border: 1px solid var(--ink); box-shadow: 12px 12px 0 var(--cyan); overflow: hidden; }
.hero-media::before { content: ""; position: absolute; right: -55px; top: 62px; width: 170px; height: 70px; background: var(--orange); transform: rotate(90deg); }
.media-label { justify-content: space-between; position: relative; z-index: 1; border-bottom: 1px solid #45515a; padding-bottom: 10px; }
.media-label b { color: var(--cyan); }
.hero-shot { min-height: 0; display: grid; place-items: center; padding: 14px 40px 10px; }
.hero-shot img { width: min(100%, 244px); max-width: 400px; max-height: 410px; object-fit: contain; border: 1px solid #5d6870; box-shadow: 12px 12px 0 rgba(105,86,232,.65); }
.media-status { display: flex; align-items: center; gap: 13px; font-size: 11px; font-weight: 800; border-top: 1px solid #45515a; padding-top: 10px; }
.status-dot { width: 9px; height: 9px; background: var(--orange); border-radius: 50%; }

.section { padding: 84px 0; }
.section-head { display: grid; grid-template-columns: 170px minmax(0,1fr); align-items: end; gap: 22px; margin-bottom: 36px; border-bottom: 2px solid var(--ink); }
.section-head span { padding-bottom: 10px; color: var(--violet); font-size: 11px; font-weight: 900; }
.section-head h2 { margin: 0; padding-bottom: 8px; font-size: 34px; line-height: 1.2; }
.section-head.light { border-color: #5a6872; }
.section-head.light h2 { color: var(--paper); }
.section-head.light span { color: var(--cyan); }
.preview-section { background: var(--paper); }
.gallery-grid { display: grid; grid-template-columns: 1.12fr 1fr 1fr; gap: 18px; align-items: stretch; }
.gallery-item { margin: 0; display: grid; grid-template-rows: 430px auto; border: 1px solid var(--ink); background: var(--paper); }
.gallery-item.tall { background: var(--mist); }
.gallery-visual { min-width: 0; display: grid; place-items: center; padding: 22px; overflow: hidden; background: repeating-linear-gradient(90deg, transparent 0 38px, rgba(16,24,32,.06) 38px 39px); }
.gallery-visual img { width: auto; max-width: 400px; max-height: 386px; object-fit: contain; border: 1px solid var(--line); }
.gallery-item figcaption { display: grid; min-width: 0; gap: 5px; padding: 18px; border-top: 1px solid var(--ink); }
.gallery-item figcaption b { font-size: 17px; }
.gallery-item figcaption span { color: var(--muted); font-size: 13px; }

.metadata-section, .faq-preview { background: var(--ink); color: var(--paper); }
.metadata-grid { display: grid; grid-template-columns: 280px minmax(0,1fr); gap: 64px; }
.metadata-grid .section-head { display: block; border: 0; }
.metadata-grid .section-head h2 { margin-top: 14px; font-size: 44px; }
.metadata-table { border-top: 1px solid #5a6872; }
.metadata-table > div { display: grid; grid-template-columns: 42px 190px minmax(0,1fr); gap: 20px; align-items: start; padding: 20px 0; border-bottom: 1px solid #5a6872; }
.metadata-table span { color: var(--orange); font-weight: 900; }
.metadata-table b { font-size: 16px; }
.metadata-table p { margin: 0; color: #c6d0d5; font-size: 14px; }
.feature-grid { display: grid; grid-template-columns: repeat(4, minmax(0,1fr)); border: 1px solid var(--ink); }
.feature-grid article { min-width: 0; min-height: 220px; padding: 24px; border-right: 1px solid var(--ink); }
.feature-grid article:last-child { border-right: 0; }
.feature-grid article > span { color: var(--violet); font-weight: 900; }
.feature-grid h3 { margin: 32px 0 8px; font-size: 20px; }
.feature-grid p { margin: 0; color: var(--muted); font-size: 14px; }
.deep-links { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-top: 18px; }
.deep-links > div { padding: 28px; border: 1px solid var(--line); background: var(--mist); }
.deep-links span { color: var(--orange); font-size: 11px; font-weight: 900; }
.deep-links h3 { margin: 8px 0; }
.deep-links p { color: var(--muted); }
.deep-links a { display: inline-block; font-weight: 900; border-bottom: 2px solid var(--violet); }
.faq-preview-grid { display: grid; grid-template-columns: 300px 1fr; gap: 60px; }
.faq-preview-grid .section-head { display: block; border: 0; }
.faq-preview-grid .section-head h2 { margin-top: 14px; font-size: 44px; }
.quick-questions { border-top: 1px solid #5a6872; }
.quick-questions a { display: flex; justify-content: space-between; gap: 16px; padding: 20px 0; border-bottom: 1px solid #5a6872; }
.quick-questions a:hover span { color: var(--cyan); }
.quick-questions b { color: var(--orange); }
.download-band { padding: 54px 0; background: var(--violet); color: var(--paper); }
.download-inner { display: flex; justify-content: space-between; align-items: center; gap: 30px; }
.download-inner span { color: var(--cyan); font-size: 11px; font-weight: 900; }
.download-inner h2 { margin: 7px 0 3px; font-size: 30px; }
.download-inner p, .download-inner .band-note { margin: 0; color: #e5e1ff; }
.download-inner .button.primary { flex: 0 0 auto; }

.inner-main { background: var(--paper); }
.inner-hero { padding: 70px 0 66px; background: linear-gradient(90deg, var(--ink) 0 66%, var(--violet) 66% 100%); color: var(--paper); }
.inner-hero.compact { background: linear-gradient(90deg, var(--ink) 0 66%, var(--orange) 66% 100%); }
.inner-hero-grid { display: grid; grid-template-columns: minmax(0,1.35fr) minmax(280px,.65fr); align-items: center; gap: 70px; }
.page-code { color: var(--cyan); }
.inner-hero h1 { max-width: 760px; margin: 14px 0; font-size: 46px; line-height: 1.18; letter-spacing: 0; }
.inner-hero h1 span { display: block; }
.inner-hero p { max-width: 720px; margin: 0; color: #d5dde1; font-size: 16px; }
.inner-hero .button.secondary { color: var(--ink); }
.guide-index { display: grid; border: 1px solid rgba(255,255,255,.65); background: var(--paper); color: var(--ink); box-shadow: 10px 10px 0 var(--cyan); }
.guide-index span { padding: 13px 17px; border-bottom: 1px solid var(--line); font-size: 13px; font-weight: 800; }
.guide-index span:last-child { border-bottom: 0; }
.article-section { padding: 76px 0 88px; }
.article-layout { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 70px; align-items: start; }
.article-aside { position: sticky; top: 100px; display: grid; border-top: 3px solid var(--violet); }
.article-aside b, .article-aside a { padding: 11px 2px; border-bottom: 1px solid var(--line); }
.article-aside a { color: var(--muted); font-size: 13px; }
.article-body { min-width: 0; }
.article-body section { scroll-margin-top: 96px; padding: 0 0 38px; margin: 0 0 42px; border-bottom: 1px solid var(--line); }
.step-no { color: var(--orange); font-size: 13px; font-weight: 900; }
.article-body h2 { margin: 5px 0 16px; font-size: 28px; }
.article-body p { margin: 0 0 14px; color: #35444c; }
.article-body a { color: var(--violet); font-weight: 800; border-bottom: 1px solid currentColor; }
.support-meter { padding: 24px; background: var(--paper); color: var(--ink); border: 1px solid var(--ink); box-shadow: 10px 10px 0 var(--cyan); }
.support-meter > span { display: block; color: var(--violet); font-size: 62px; line-height: 1; font-weight: 900; }
.support-meter p { margin: 8px 0 18px; color: var(--muted); }
.support-meter a { font-weight: 900; border-bottom: 2px solid var(--orange); }
.faq-section { padding: 76px 0 88px; }
.faq-list { border-top: 2px solid var(--ink); }
.faq-list details { border-bottom: 1px solid var(--ink); }
.faq-list summary { list-style: none; display: grid; grid-template-columns: 58px minmax(0,1fr); gap: 16px; align-items: center; cursor: pointer; padding: 19px 0; font-size: 17px; font-weight: 800; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after { content: "+"; grid-column: 3; font-size: 22px; }
.faq-list details[open] summary::after { content: "−"; }
.faq-list summary span { color: var(--violet); }
.faq-list details > div { padding: 0 70px 22px; color: #40505a; }
.faq-list details p { margin: 0; }
.faq-end { margin-top: 50px; padding: 34px; background: var(--mist); border-left: 8px solid var(--orange); }
.faq-end h2 { margin: 0; font-size: 28px; }
.faq-end p { color: var(--muted); }
.faq-end .button { margin: 8px 10px 0 0; }
.site-footer { padding: 30px 0; background: #081015; color: #b9c6cc; text-align: center; }
.site-footer .shell { display: grid; gap: 6px; justify-items: center; }
.site-footer p { margin: 0; text-align: center; font-size: 12px; }
.site-footer span { font-size: 12px; }

@media (max-width: 900px) {
  .site-nav { position: absolute; top: 72px; left: 20px; right: 20px; display: none; padding: 14px; background: var(--paper); border: 1px solid var(--ink); box-shadow: 7px 7px 0 var(--ink); }
  .site-nav.open { display: grid; gap: 4px; }
  .site-nav a, .site-nav .nav-download { padding: 11px 12px; border: 0; }
  .menu-toggle { display: block; }
  .hero { background: var(--paper); }
  .hero-grid { grid-template-columns: 1fr; gap: 34px; padding: 42px 0 54px; }
  .hero-copy { order: 1; }
  .hero-media { order: 2; min-height: 470px; }
  .gallery-grid { grid-template-columns: 1fr; }
  .gallery-item { grid-template-rows: 390px auto; }
  .metadata-grid, .faq-preview-grid { grid-template-columns: 1fr; gap: 24px; }
  .feature-grid { grid-template-columns: 1fr 1fr; }
  .feature-grid article:nth-child(2) { border-right: 0; }
  .feature-grid article:nth-child(-n+2) { border-bottom: 1px solid var(--ink); }
  .inner-hero { background: var(--ink); }
  .inner-hero.compact { background: var(--ink); }
  .inner-hero-grid { grid-template-columns: 1fr; gap: 38px; }
  .article-layout { grid-template-columns: 1fr; gap: 34px; }
  .article-aside { position: static; grid-template-columns: repeat(2, minmax(0,1fr)); }
}

@media (max-width: 620px) {
  .shell, .header-inner { width: min(100% - 28px, 1180px); }
  .header-inner { min-height: 64px; }
  .site-nav { top: 64px; left: 14px; right: 14px; }
  .brand img { width: 38px; height: 38px; }
  .hero-grid { min-height: 0; padding: 18px 0 24px; gap: 16px; }
  .eyebrow { gap: 9px; }
  .hero h1 { margin: 12px 0 9px; font-size: 36px; }
  .hero-copy > p { font-size: 14px; line-height: 1.55; }
  .hero-actions { margin-top: 14px; }
  .hero-actions .button { flex: 1 1 150px; }
  .signal-list { margin-top: 14px; }
  .signal-list div { padding-top: 8px; }
  .signal-list dd { font-size: 11px; }
  .hero-media { min-height: 260px; padding: 11px; box-shadow: 7px 7px 0 var(--cyan); }
  .hero-media::before { right: -36px; top: 50px; width: 112px; height: 52px; }
  .hero-shot { padding: 6px 20px 4px; }
  .hero-shot img { width: 116px; max-height: 206px; box-shadow: 6px 6px 0 rgba(105,86,232,.65); }
  .media-status { gap: 8px; font-size: 10px; }
  .section { padding: 58px 0; }
  .section-head { grid-template-columns: 1fr; gap: 0; }
  .section-head h2 { font-size: 29px; }
  .gallery-item { grid-template-rows: 350px auto; }
  .gallery-visual img { max-height: 310px; }
  .metadata-grid .section-head h2, .faq-preview-grid .section-head h2 { font-size: 36px; }
  .metadata-table > div { grid-template-columns: 32px minmax(0,1fr); gap: 10px; }
  .metadata-table p { grid-column: 2; }
  .feature-grid { grid-template-columns: 1fr; }
  .feature-grid article { min-height: 0; border-right: 0; border-bottom: 1px solid var(--ink); }
  .feature-grid article:last-child { border-bottom: 0; }
  .feature-grid h3 { margin-top: 18px; }
  .deep-links { grid-template-columns: 1fr; }
  .download-inner { align-items: stretch; flex-direction: column; }
  .download-inner h2 { font-size: 25px; }
  .inner-hero { padding: 48px 0; }
  .inner-hero h1 { font-size: 34px; }
  .article-section, .faq-section { padding: 52px 0 64px; }
  .article-aside { grid-template-columns: 1fr 1fr; }
  .article-aside b { grid-column: 1 / -1; }
  .article-body h2 { font-size: 24px; }
  .faq-list summary { grid-template-columns: 38px minmax(0,1fr) auto; gap: 8px; font-size: 15px; }
  .faq-list details > div { padding: 0 8px 20px 46px; }
  .faq-end { padding: 24px; }
}