:root {
  --ink: #17151c;
  --muted: #67636f;
  --paper: #fbfaf7;
  --line: #d9d5cc;
  --orange: #e6502f;
  --orange-dark: #bd351c;
  --violet: #7057d9;
  --teal: #157f7b;
  --soft-violet: #eeeafb;
  --soft-teal: #e5f3f1;
  --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; }
a { color: inherit; }
img { display: block; max-width: 100%; }
button { font: inherit; }
.site-header { position: sticky; top: 0; z-index: 30; width: 100%; background: rgba(251,250,247,.96); border-bottom: 1px solid var(--line); backdrop-filter: blur(12px); }
.header-inner, .hero-inner, .section-inner, .footer-inner { width: min(calc(100% - 40px), var(--max)); margin: 0 auto; }
.header-inner { height: 76px; display: flex; align-items: center; gap: 28px; }
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; font-weight: 800; white-space: nowrap; }
.brand img { width: 42px; height: 42px; border: 1px solid var(--ink); border-radius: 8px; }
.site-nav { display: flex; gap: 6px; margin-left: auto; }
.site-nav a { padding: 8px 13px; text-decoration: none; color: var(--muted); border-bottom: 2px solid transparent; }
.site-nav a:hover, .site-nav a.active { color: var(--ink); border-color: var(--violet); }
.download { text-decoration: none; }
.header-download { padding: 9px 17px; color: #fff; background: var(--ink); border: 1px solid var(--ink); font-weight: 700; }
.menu-toggle { display: none; width: 42px; height: 42px; border: 1px solid var(--line); background: transparent; font-size: 22px; cursor: pointer; }
.hero { border-bottom: 1px solid var(--line); overflow: hidden; }
.hero-inner { min-height: 650px; display: grid; grid-template-columns: minmax(0, 1.12fr) minmax(390px, .88fr); align-items: center; gap: 58px; padding: 30px 0 26px; }
.eyebrow, .kicker { display: flex; align-items: center; gap: 12px; color: var(--violet); font-size: 12px; font-weight: 800; text-transform: uppercase; }
.eyebrow span { padding: 4px 9px; color: #fff; background: var(--violet); }
.eyebrow b { color: var(--teal); }
h1, h2, h3, p { margin-top: 0; }
.hero h1 { max-width: 650px; margin: 22px 0 18px; font-size: clamp(32px, 4.2vw, 60px); line-height: 1.08; white-space: nowrap; }
.hero-copy > p { max-width: 630px; margin-bottom: 25px; color: #45414a; font-size: 18px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 29px; }
.primary, .secondary { display: inline-flex; min-width: 138px; min-height: 48px; align-items: center; justify-content: center; padding: 10px 20px; border: 1px solid var(--ink); font-weight: 800; text-decoration: none; }
.primary { color: #fff; background: var(--orange); border-color: var(--orange); box-shadow: 5px 5px 0 var(--ink); }
.primary:hover { background: var(--orange-dark); }
.secondary { background: transparent; }
.hero-facts { display: flex; gap: 38px; margin: 0; padding-top: 18px; border-top: 1px solid var(--line); }
.hero-facts div { display: grid; gap: 1px; }
.hero-facts dt { color: var(--muted); font-size: 12px; }
.hero-facts dd { margin: 0; font-size: 14px; font-weight: 700; }
.hero-media { position: relative; min-height: 500px; display: flex; align-items: center; justify-content: center; padding: 16px 58px 42px 24px; }
.phone-frame { position: relative; z-index: 2; padding: 9px; background: var(--ink); border-radius: 24px; box-shadow: 18px 22px 0 var(--soft-violet); }
.phone-frame img { width: min(280px, 100%); max-width: 400px; height: auto; border-radius: 16px; }
.bookmark-tab { position: absolute; right: 7px; width: 104px; padding: 10px 13px; color: #fff; font-size: 13px; font-weight: 800; text-align: right; border-radius: 0 8px 8px 0; }
.tab-one { top: 116px; background: var(--violet); }
.tab-two { top: 172px; background: var(--teal); }
.tab-three { top: 228px; color: var(--ink); background: #f2b932; }
.collection-status { position: absolute; right: 2px; bottom: 18px; z-index: 3; width: 300px; display: grid; grid-template-columns: 54px 1fr; align-items: center; background: #fff; border: 1px solid var(--ink); box-shadow: 7px 7px 0 var(--orange); }
.collection-status b { padding: 12px; color: #fff; background: var(--ink); font-size: 20px; text-align: center; }
.collection-status span { padding: 8px 12px; font-size: 12px; font-weight: 700; line-height: 1.35; }
.section-band { padding: 86px 0; border-bottom: 1px solid var(--line); }
.section-heading { display: flex; align-items: flex-end; justify-content: space-between; gap: 20px; margin-bottom: 36px; }
.section-heading span { color: var(--violet); font-size: 12px; font-weight: 800; }
.section-heading h2 { margin: 0; font-size: clamp(30px, 4vw, 48px); line-height: 1; }
.gallery { background: #fff; }
.gallery-grid { display: grid; grid-template-columns: 1.15fr 1fr 1fr; gap: 20px; align-items: end; }
.gallery-grid figure { margin: 0; padding: 20px; background: var(--paper); border: 1px solid var(--line); }
.gallery-grid figure:nth-child(2) { transform: translateY(-18px); }
.gallery-grid img { width: 100%; max-width: 315px; height: auto; margin: 0 auto; border: 1px solid #c7c2b8; }
.gallery-grid figcaption { display: grid; gap: 4px; margin-top: 17px; }
.gallery-grid figcaption b { font-size: 17px; }
.gallery-grid figcaption span { color: var(--muted); font-size: 13px; }
.features { background: var(--soft-teal); }
.feature-grid { display: grid; grid-template-columns: repeat(4, 1fr); border: 1px solid var(--ink); }
.feature-grid article { min-height: 260px; padding: 26px; background: #fff; border-right: 1px solid var(--ink); }
.feature-grid article:last-child { border-right: 0; }
.feature-grid article > b { color: var(--orange); font-size: 13px; }
.feature-grid h3 { margin: 38px 0 12px; font-size: 22px; }
.feature-grid p { margin: 0; color: var(--muted); font-size: 14px; }
.collection-layout { display: grid; grid-template-columns: 1.2fr .8fr; gap: 70px; align-items: start; }
.steps { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.steps li { display: grid; grid-template-columns: 58px 1fr; gap: 20px; padding: 22px 0; border-bottom: 1px solid var(--line); }
.steps li > span { color: var(--violet); font-size: 12px; font-weight: 800; }
.steps h3 { margin-bottom: 6px; }
.steps p { margin: 0; color: var(--muted); }
.route-panel { margin-top: 55px; padding: 34px; color: #fff; background: var(--ink); border-top: 8px solid var(--orange); }
.panel-label { color: #a99de8; font-size: 12px; font-weight: 800; }
.route-panel h3 { margin: 22px 0 13px; font-size: 28px; }
.route-panel p { color: #d2ced7; }
.route-panel a { display: flex; justify-content: space-between; padding: 13px 0; color: #fff; border-top: 1px solid #4d4853; text-decoration: none; }
.faq-preview { background: var(--soft-violet); }
.question-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.question-grid a { min-height: 170px; display: flex; flex-direction: column; justify-content: space-between; padding: 25px; background: #fff; border: 1px solid var(--line); text-decoration: none; }
.question-grid b { font-size: 18px; }
.question-grid span { color: var(--muted); font-size: 14px; }
.final-cta { padding: 45px 0; color: #fff; background: var(--violet); }
.final-inner { display: flex; align-items: center; justify-content: space-between; gap: 28px; }
.final-inner span { font-size: 12px; font-weight: 800; }
.final-inner h2 { margin: 8px 0 0; font-size: 30px; }
.final-inner .primary { background: #fff; color: var(--ink); border-color: var(--ink); }
.site-footer { padding: 28px 0; background: var(--ink); color: #c7c2cc; }
.footer-inner { text-align: center; }
.footer-inner p { margin: 4px auto; font-size: 12px; }

.inner-main { min-height: 70vh; }
.inner-hero { padding: 72px 0 58px; border-bottom: 1px solid var(--line); background: var(--soft-violet); }
.inner-hero-grid { display: grid; grid-template-columns: 1fr 320px; gap: 80px; align-items: end; }
.inner-hero h1 { margin: 15px 0 18px; font-size: clamp(40px, 5vw, 64px); line-height: 1.1; }
.inner-hero p { max-width: 720px; margin: 0; color: #514d57; font-size: 17px; }
.inner-hero aside { padding: 24px; background: #fff; border: 1px solid var(--ink); box-shadow: 7px 7px 0 var(--orange); }
.inner-hero aside b { display: block; margin-bottom: 10px; }
.inner-hero aside ul, .inner-hero aside ol { margin: 0; padding-left: 20px; color: var(--muted); }
.article-section, .faq-section { padding: 72px 0 90px; }
.article-shell { width: min(calc(100% - 40px), var(--max)); margin: 0 auto; display: grid; grid-template-columns: 220px minmax(0, 760px); gap: 70px; justify-content: center; }
.article-index { position: sticky; top: 104px; align-self: start; display: grid; gap: 3px; padding: 18px; background: #fff; border: 1px solid var(--line); }
.article-index span { margin-bottom: 8px; color: var(--orange); font-size: 12px; font-weight: 800; }
.article-index a { padding: 8px 10px; color: var(--muted); text-decoration: none; }
.article-index a:hover { color: var(--ink); background: var(--soft-violet); }
.prose section { position: relative; padding: 0 0 45px 64px; margin-bottom: 42px; border-bottom: 1px solid var(--line); }
.step-number { position: absolute; left: 0; top: 4px; width: 42px; height: 28px; display: grid; place-items: center; color: #fff; background: var(--violet); font-size: 12px; font-weight: 800; }
.prose h2 { margin-bottom: 18px; font-size: 29px; }
.prose p { color: #4f4b53; }
.prose a:not(.inline-download) { color: var(--violet); font-weight: 700; }
.inline-download { display: inline-flex; padding: 9px 18px; color: #fff; background: var(--orange); font-weight: 800; }
.faq-hero { background: var(--soft-teal); }
.faq-layout { display: grid; gap: 26px; }
.faq-filter { display: flex; flex-wrap: wrap; gap: 8px; }
.faq-filter button { padding: 8px 17px; color: var(--muted); background: #fff; border: 1px solid var(--line); cursor: pointer; }
.faq-filter button.active { color: #fff; background: var(--violet); border-color: var(--violet); }
.faq-list { border-top: 1px solid var(--ink); }
.faq-item { border-bottom: 1px solid var(--line); }
.faq-item[hidden] { display: none; }
.faq-item > button { width: 100%; min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 18px; padding: 16px 0; color: var(--ink); background: transparent; border: 0; cursor: pointer; text-align: left; }
.faq-item button span { display: flex; align-items: center; gap: 18px; font-size: 18px; font-weight: 800; }
.faq-item button b { width: 38px; color: var(--violet); font-size: 12px; }
.faq-item button i { width: 34px; height: 34px; display: grid; place-items: center; background: var(--soft-violet); font-style: normal; font-size: 22px; }
.faq-item .answer { display: none; padding: 0 54px 22px 56px; color: var(--muted); }
.faq-item.open .answer { display: block; }
.faq-item.open button i { color: #fff; background: var(--orange); transform: rotate(45deg); }
.answer p { margin: 0; }
.faq-help { display: flex; align-items: center; justify-content: space-between; gap: 30px; padding: 30px; color: #fff; background: var(--ink); }
.faq-help span { color: #b7aaf5; font-size: 12px; font-weight: 800; }
.faq-help h2 { margin: 4px 0; font-size: 26px; }
.faq-help p { margin: 0; color: #c7c2cc; }
.faq-help > a { padding: 12px 18px; white-space: nowrap; color: #fff; border: 1px solid #6d6772; text-decoration: none; }

@media (max-width: 900px) {
  .header-inner { height: 68px; gap: 12px; }
  .menu-toggle { display: grid; place-items: center; margin-left: auto; }
  .site-nav { position: absolute; top: 68px; left: 20px; right: 20px; display: none; margin: 0; padding: 10px; background: #fff; border: 1px solid var(--line); box-shadow: 6px 6px 0 var(--ink); }
  .site-nav.open { display: grid; }
  .site-nav a { padding: 12px; }
  .header-download { display: none; }
  .hero-inner { grid-template-columns: 1fr; gap: 10px; padding: 32px 0 20px; }
  .hero-copy { order: 1; }
  .hero-media { order: 2; min-height: 340px; padding-top: 8px; }
  .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); }
  .collection-layout, .inner-hero-grid { grid-template-columns: 1fr; gap: 35px; }
  .route-panel { margin-top: 0; }
  .article-shell { grid-template-columns: 1fr; gap: 35px; }
  .article-index { position: static; grid-template-columns: 1fr 1fr; }
  .article-index span { grid-column: 1 / -1; }
}

@media (max-width: 640px) {
  .header-inner, .hero-inner, .section-inner, .footer-inner, .article-shell { width: min(calc(100% - 28px), var(--max)); }
  .brand img { width: 38px; height: 38px; }
  .brand span { font-size: 15px; }
  .hero-inner { min-height: auto; }
  .hero h1 { margin-top: 15px; font-size: 32px; }
  .hero-copy > p { font-size: 16px; line-height: 1.65; }
  .hero-facts { gap: 22px; }
  .hero-media { min-height: 260px; padding: 0 42px 18px 0; margin: 0; }
  .hero-media .phone-frame { padding: 5px; border-radius: 14px; box-shadow: 10px 12px 0 var(--soft-violet); }
  .hero-media .phone-frame img { width: 140px; border-radius: 10px; }
  .hero-media .bookmark-tab { right: 4px; width: 70px; padding: 6px 8px; font-size: 10px; }
  .hero-media .tab-one { top: 38px; }
  .hero-media .tab-two { top: 78px; }
  .hero-media .tab-three { top: 118px; }
  .hero-media .collection-status { right: 0; bottom: 2px; width: 225px; grid-template-columns: 38px 1fr; box-shadow: 4px 4px 0 var(--orange); }
  .hero-media .collection-status b { padding: 8px; font-size: 15px; }
  .hero-media .collection-status span { padding: 5px 8px; font-size: 10px; }
  .section-band { padding: 60px 0; }
  .gallery.section-band { padding-top: 32px; }
  .section-heading { align-items: flex-start; flex-direction: column; gap: 8px; }
  .gallery-grid { grid-template-columns: 1fr 1fr; }
  .gallery-grid .preview-main { grid-column: 1 / -1; }
  .gallery-grid figure:nth-child(2) { transform: none; }
  .gallery-grid figure { padding: 11px; }
  .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: 22px; }
  .question-grid { grid-template-columns: 1fr; }
  .final-inner, .faq-help { align-items: flex-start; flex-direction: column; }
  .inner-hero { padding: 48px 0 42px; }
  .inner-hero h1 { font-size: 40px; }
  .article-section, .faq-section { padding: 50px 0 65px; }
  .article-index { grid-template-columns: 1fr; }
  .prose section { padding-left: 0; padding-top: 46px; }
  .step-number { top: 0; }
  .faq-item button span { align-items: flex-start; gap: 10px; font-size: 16px; }
  .faq-item button b { width: 26px; }
  .faq-item .answer { padding: 0 0 20px 36px; }
}