:root {
  --ink: #202421;
  --muted: #626963;
  --paper: #f7f6f1;
  --white: #ffffff;
  --line: #d9ddd6;
  --orange: #e76819;
  --orange-dark: #b94709;
  --sage: #637a6b;
}

* { 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%; }
.site-header { position: sticky; top: 0; z-index: 20; background: rgba(247, 246, 241, .96); border-bottom: 1px solid var(--line); backdrop-filter: blur(12px); }
.header-inner, .hero-inner, .section-inner { width: min(1160px, calc(100% - 48px)); margin: 0 auto; }
.header-inner { min-height: 72px; display: flex; align-items: center; gap: 30px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; font-size: 18px; }
.brand img { border-radius: 8px; }
.site-nav { display: flex; gap: 24px; margin-left: auto; }
.site-nav a { color: #4f5651; font-size: 15px; border-bottom: 2px solid transparent; padding: 23px 0 20px; }
.site-nav a:hover, .site-nav .active { color: var(--ink); border-color: var(--orange); }
.header-download, .primary-button, .light-button { display: inline-flex; justify-content: center; align-items: center; min-height: 44px; padding: 0 20px; border-radius: 6px; font-weight: 800; }
.header-download, .primary-button { color: #fff; background: var(--orange-dark); }
.header-download:hover, .primary-button:hover { background: #913906; }
.menu-button { display: none; }
.hero { overflow: hidden; border-bottom: 1px solid var(--line); }
.hero-inner { min-height: 680px; display: grid; grid-template-columns: minmax(0, 1fr) minmax(430px, .9fr); gap: 68px; align-items: center; padding: 54px 0 60px; }
.eyebrow { color: var(--orange-dark); font-size: 12px; font-weight: 900; letter-spacing: 1.8px; }
h1, h2, h3, p { margin-top: 0; }
.hero h1 { max-width: 580px; margin: 15px 0 20px; font-size: clamp(42px, 4vw, 58px); line-height: 1.12; letter-spacing: 0; }
.hero-copy > p { max-width: 610px; color: #444b46; font-size: 18px; }
.hero-actions { display: flex; align-items: center; gap: 24px; margin: 30px 0; }
.text-link { color: var(--orange-dark); font-weight: 800; text-decoration: underline; text-underline-offset: 5px; }
.hero-facts { display: flex; gap: 34px; margin: 0; padding-top: 22px; border-top: 1px solid var(--line); }
.hero-facts div { min-width: 140px; }
.hero-facts dt { color: var(--muted); font-size: 12px; }
.hero-facts dd { margin: 2px 0 0; font-weight: 800; }
.hero-media { position: relative; min-height: 520px; display: flex; align-items: center; justify-content: center; }
.media-index { position: absolute; top: 20px; right: 0; display: grid; text-align: right; color: var(--sage); }
.media-index span { font-size: 30px; font-weight: 900; line-height: 1; }
.media-index b { font-size: 12px; }
.screen { position: absolute; width: min(230px, 48%); height: auto; max-width: 400px; object-fit: contain; border: 8px solid #242824; border-radius: 22px; box-shadow: 0 22px 50px rgba(35, 38, 35, .18); }
.screen-back { left: 35px; transform: translateY(8px); }
.screen-front { right: 30px; z-index: 2; transform: translateY(-5px); }
.section-band { padding: 76px 0; }
.section-heading { display: flex; align-items: baseline; gap: 15px; margin-bottom: 34px; }
.section-heading > span { color: var(--orange-dark); font-size: 13px; font-weight: 900; }
.section-heading h2 { margin: 0; font-size: 34px; line-height: 1.2; }
.path-grid { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.path-grid article { padding: 30px; border-right: 1px solid var(--line); }
.path-grid article:last-child { border-right: 0; }
.path-grid b { color: var(--sage); font-size: 13px; }
.path-grid h3 { margin: 8px 0; font-size: 20px; }
.path-grid p, .feature-list p, .section-note { color: var(--muted); }
.muted-band { background: #e8ece7; }
.gallery-grid { display: grid; grid-template-columns: 1fr 420px; gap: 90px; align-items: center; }
.gallery figure { margin: 0; display: grid; grid-template-columns: auto 1fr; gap: 22px; align-items: end; }
.gallery figure img { width: 238px; height: auto; max-width: 400px; object-fit: contain; border: 7px solid #252925; border-radius: 20px; box-shadow: 0 18px 36px rgba(36, 42, 37, .17); }
.gallery figcaption { color: #515a53; font-size: 14px; }
.feature-list { display: grid; grid-template-columns: 1fr 1fr; border-top: 1px solid var(--line); }
.feature-list article { display: grid; grid-template-columns: 52px 1fr; gap: 14px; padding: 30px 20px 22px 0; border-bottom: 1px solid var(--line); }
.feature-list article:nth-child(odd) { margin-right: 36px; }
.feature-list article > span { color: var(--orange-dark); font-weight: 900; }
.feature-list h3 { margin-bottom: 4px; }
.dark-band { color: #fff; background: #252a26; }
.dark-band .section-heading > span { color: #f4a05e; }
.preview-row { display: flex; justify-content: space-between; gap: 40px; align-items: center; }
.preview-row p { max-width: 740px; margin: 0; color: #d4d9d5; font-size: 18px; }
.light-button { color: #222; background: #fff; white-space: nowrap; }
.final-action { width: min(1160px, calc(100% - 48px)); margin: 0 auto; padding: 62px 0; display: flex; justify-content: space-between; align-items: center; gap: 30px; }
.final-action span { color: var(--orange-dark); font-weight: 800; font-size: 13px; }
.final-action h2 { margin: 5px 0 0; font-size: 30px; }
footer { padding: 32px 24px; color: #636a65; background: #eceeea; text-align: center; border-top: 1px solid var(--line); font-size: 13px; }
footer p { margin: 4px 0; }
.article-main { min-height: 70vh; }
.article-hero { background: #252a26; color: #fff; }
.article-hero > div { width: min(1160px, calc(100% - 48px)); margin: 0 auto; padding: 72px 0 64px; }
.article-hero span { color: #f3a263; font-size: 12px; font-weight: 900; }
.article-hero h1 { margin: 10px 0 14px; font-size: clamp(36px, 5vw, 58px); line-height: 1.15; }
.article-hero p { max-width: 700px; margin: 0; color: #d4d9d5; font-size: 17px; }
.article-layout { width: min(1160px, calc(100% - 48px)); margin: 0 auto; display: grid; grid-template-columns: 220px 1fr; gap: 70px; padding: 60px 0 90px; }
.article-layout aside { position: sticky; top: 98px; align-self: start; display: grid; gap: 10px; padding: 20px; border: 1px solid var(--line); background: #fff; border-radius: 6px; }
.article-layout aside a { color: var(--muted); font-size: 14px; }
.article-content section { padding: 0 0 36px; margin-bottom: 38px; border-bottom: 1px solid var(--line); scroll-margin-top: 100px; }
.article-content h2 { font-size: 30px; margin: 6px 0 18px; }
.article-content p { color: #444b46; }
.step { color: var(--orange-dark); font-size: 13px; font-weight: 900; }
.faq-hero { background: var(--sage); }
.faq-page { width: min(980px, calc(100% - 48px)); margin: 0 auto; padding: 58px 0 90px; }
.faq-intro, .support-action { display: flex; justify-content: space-between; gap: 40px; align-items: center; }
.faq-intro h2, .support-action h2 { margin-bottom: 4px; font-size: 30px; }
.faq-intro p, .support-action p { margin: 0; color: var(--muted); }
.faq-list { margin: 35px 0 60px; border-top: 1px solid var(--line); }
.faq-list details { border-bottom: 1px solid var(--line); }
.faq-list summary { cursor: pointer; padding: 20px 42px 20px 0; font-weight: 800; list-style: none; position: relative; }
.faq-list summary::after { content: "+"; position: absolute; right: 8px; color: var(--orange-dark); font-size: 22px; }
.faq-list details[open] summary::after { content: "−"; }
.faq-list details p { color: var(--muted); padding: 0 45px 20px 0; margin: 0; }
.support-action { padding: 30px; border: 1px solid var(--line); background: #fff; border-radius: 6px; }

@media (max-width: 820px) {
  .header-inner, .hero-inner, .section-inner, .final-action, .article-hero > div, .article-layout, .faq-page { width: min(100% - 32px, 680px); }
  .header-inner { min-height: 64px; gap: 12px; }
  .brand span { font-size: 16px; }
  .menu-button { display: inline-flex; margin-left: auto; padding: 8px 10px; border: 1px solid var(--line); background: #fff; border-radius: 5px; }
  .header-download { display: none; }
  .site-nav { display: none; position: absolute; top: 64px; left: 16px; right: 16px; margin: 0; padding: 10px 18px; background: #fff; border: 1px solid var(--line); box-shadow: 0 12px 24px rgba(0, 0, 0, .12); }
  .site-nav.open { display: grid; }
  .site-nav a { padding: 10px 0; }
  .hero-inner { min-height: auto; grid-template-columns: 1fr; gap: 24px; padding: 42px 0 38px; }
  .hero h1 { font-size: 42px; }
  .hero-copy > p { font-size: 16px; }
  .hero-actions { margin: 24px 0; flex-wrap: wrap; }
  .hero-facts { gap: 16px; }
  .hero-facts div { min-width: 0; }
  .hero-media { min-height: 280px; order: 2; }
  .media-index { top: 5px; }
  .screen { width: 144px; border-width: 5px; border-radius: 14px; }
  .screen-back { left: calc(50% - 145px); }
  .screen-front { right: calc(50% - 145px); }
  .section-band { padding: 54px 0; }
  .section-heading { margin-bottom: 26px; }
  .section-heading h2 { font-size: 29px; }
  .path-grid, .feature-list, .gallery-grid { grid-template-columns: 1fr; }
  .path-grid article { border-right: 0; border-bottom: 1px solid var(--line); padding: 22px 0; }
  .path-grid article:last-child { border-bottom: 0; }
  .gallery-grid { gap: 36px; }
  .gallery figure { justify-content: center; grid-template-columns: auto; }
  .gallery figure img { width: 190px; }
  .feature-list article:nth-child(odd) { margin-right: 0; }
  .preview-row, .final-action, .faq-intro, .support-action { align-items: flex-start; flex-direction: column; }
  .article-layout { grid-template-columns: 1fr; gap: 28px; padding-top: 30px; }
  .article-layout aside { position: static; grid-template-columns: 1fr 1fr; }
  .article-hero > div { padding: 46px 0 42px; }
  .article-hero h1 { font-size: 38px; }
}

@media (max-width: 420px) {
  .hero h1 { font-size: 37px; }
  .hero-facts { display: grid; grid-template-columns: 1fr 1fr; }
  .screen { width: 134px; }
  .screen-back { left: calc(50% - 132px); }
  .screen-front { right: calc(50% - 132px); }
  .article-layout aside { grid-template-columns: 1fr; }
}