:root {
  --ink: #20252b;
  --muted: #626c76;
  --line: #dfe4e8;
  --paper: #f6f8f9;
  --white: #ffffff;
  --accent: #d8533f;
  --accent-dark: #a93627;
  --blue: #416e86;
  --deep: #26323a;
  --shadow: 0 18px 45px rgba(29, 39, 46, 0.12);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "微软雅黑", Arial, Helvetica, sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--white); line-height: 1.7; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; height: auto; }
button { font: inherit; }
.site-header { position: sticky; top: 0; z-index: 30; background: rgba(255, 255, 255, 0.96); border-bottom: 1px solid var(--line); backdrop-filter: blur(12px); }
.header-inner { width: min(1180px, calc(100% - 40px)); height: 72px; margin: 0 auto; display: flex; align-items: center; gap: 30px; }
.brand { display: flex; align-items: center; gap: 11px; font-weight: 800; white-space: nowrap; }
.brand img { width: 42px; height: 42px; border-radius: 8px; }
.site-nav { display: flex; align-items: center; gap: 4px; margin-left: auto; }
.site-nav a { padding: 10px 15px; color: #4d5962; font-size: 15px; border-radius: 6px; }
.site-nav a:hover, .site-nav a.active { color: var(--accent-dark); background: #fff1ee; }
.header-download { padding: 10px 19px; color: #fff; background: var(--accent); border-radius: 6px; font-weight: 700; }
.header-download:hover { background: var(--accent-dark); }
.menu-button { display: none; width: 42px; height: 42px; border: 1px solid var(--line); background: #fff; border-radius: 6px; padding: 10px; }
.menu-button span { display: block; height: 2px; margin: 4px 0; background: var(--ink); }
.hero { background: linear-gradient(180deg, #f8fafb 0%, #eef2f4 100%); border-bottom: 1px solid var(--line); overflow: hidden; }
.hero-inner { width: min(1180px, calc(100% - 40px)); min-height: 660px; margin: 0 auto; padding: 48px 0 42px; display: grid; grid-template-columns: minmax(0, 1.08fr) minmax(390px, 0.92fr); align-items: center; gap: 70px; }
.eyebrow { color: var(--accent-dark); font-size: 12px; font-weight: 800; letter-spacing: 0; text-transform: uppercase; }
h1, h2, h3, p { margin-top: 0; }
.hero h1 { max-width: 690px; margin: 16px 0 20px; font-size: clamp(38px, 4.4vw, 62px); line-height: 1.14; letter-spacing: 0; }
.hero-lead { max-width: 660px; margin-bottom: 26px; color: #4c5862; font-size: 17px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }
.button { display: inline-flex; min-height: 46px; align-items: center; justify-content: center; padding: 11px 23px; border: 1px solid transparent; border-radius: 6px; font-weight: 800; }
.button-primary { color: #fff; background: var(--accent); }
.button-primary:hover { background: var(--accent-dark); }
.button-secondary { color: var(--ink); background: #fff; border-color: #cfd6da; }
.button-secondary:hover { border-color: var(--accent); color: var(--accent-dark); }
.spec-strip { display: grid; grid-template-columns: repeat(3, 1fr); margin: 32px 0 0; padding-top: 20px; border-top: 1px solid #cfd6da; }
.spec-strip div { padding-right: 14px; }
.spec-strip dt { color: #737d85; font-size: 12px; }
.spec-strip dd { margin: 2px 0 0; font-size: 14px; font-weight: 800; }
.hero-stage { position: relative; min-height: 520px; display: flex; align-items: center; justify-content: center; }
.phone-frame { width: 274px; padding: 10px; background: #171b1f; border-radius: 26px; box-shadow: var(--shadow); }
.phone-frame img { width: 100%; max-width: 400px; border-radius: 18px; }
.stage-note { position: absolute; right: 0; bottom: 44px; width: 235px; padding: 16px 18px; background: #fff; border: 1px solid var(--line); border-left: 4px solid var(--accent); border-radius: 6px; box-shadow: 0 12px 30px rgba(30, 42, 51, 0.13); }
.stage-note span { color: var(--accent); font-size: 12px; font-weight: 800; }
.stage-note strong, .stage-note small { display: block; }
.stage-note small { margin-top: 4px; color: var(--muted); line-height: 1.5; }
.section { padding: 82px 0; }
.section-inner { width: min(1180px, calc(100% - 40px)); margin: 0 auto; }
.section-rail { background: #fff; }
.rail-layout { display: grid; grid-template-columns: 250px 1fr; gap: 70px; }
.rail-heading { padding-top: 6px; border-top: 3px solid var(--accent); }
.rail-heading span { color: var(--accent); font-size: 12px; font-weight: 800; }
.rail-heading h2 { margin: 8px 0 0; font-size: 34px; }
.feature-list article { display: grid; grid-template-columns: 52px 1fr; gap: 18px; padding: 23px 0; border-top: 1px solid var(--line); }
.feature-list article:first-child { border-top: 0; padding-top: 0; }
.feature-list b { color: var(--accent); font-size: 13px; }
.feature-list h3 { margin-bottom: 5px; font-size: 21px; }
.feature-list p { margin: 0; color: var(--muted); }
.gallery-section { background: var(--paper); }
.section-heading { margin-bottom: 30px; }
.section-heading h2 { margin: 0; font-size: 34px; line-height: 1.25; }
.gallery-grid { display: grid; grid-template-columns: 0.9fr 0.9fr 1.2fr; gap: 22px; align-items: stretch; }
.gallery-card { margin: 0; padding: 16px; background: #fff; border: 1px solid var(--line); border-radius: 8px; }
.gallery-card img { width: 100%; max-width: 400px; height: 410px; object-fit: contain; margin: 0 auto; background: #171717; border-radius: 5px; }
.gallery-card figcaption { display: flex; justify-content: space-between; gap: 16px; margin-top: 14px; font-size: 13px; }
.gallery-card figcaption span { color: var(--accent-dark); font-weight: 800; }
.gallery-card figcaption strong { text-align: right; }
.interface-demo { min-height: 500px; padding: 22px; color: #eff4f6; background: var(--deep); border-radius: 8px; display: flex; flex-direction: column; }
.demo-top { display: flex; align-items: center; gap: 10px; padding-bottom: 18px; border-bottom: 1px solid rgba(255,255,255,.16); }
.demo-top i { width: 10px; height: 10px; background: var(--accent); border-radius: 50%; }
.demo-top span { font-weight: 800; }
.demo-top em { margin-left: auto; color: #b8c7cf; font-size: 12px; font-style: normal; }
.demo-tabs { display: grid; grid-template-columns: repeat(3,1fr); gap: 6px; margin: 20px 0; }
.demo-tabs b { padding: 9px 4px; color: #b8c7cf; border: 1px solid rgba(255,255,255,.15); border-radius: 5px; text-align: center; font-size: 13px; }
.demo-tabs .selected { color: #fff; background: var(--accent); border-color: var(--accent); }
.demo-item { display: grid; grid-template-columns: 42px 1fr auto; gap: 12px; align-items: center; padding: 16px 0; border-bottom: 1px solid rgba(255,255,255,.12); }
.demo-item div strong, .demo-item div small { display: block; }
.demo-item div small { color: #b8c7cf; }
.demo-item > i { color: #e4b4ac; font-size: 12px; font-style: normal; }
.swatch { width: 38px; height: 38px; border-radius: 6px; }
.swatch.coral { background: #d8533f; }
.swatch.blue { background: #416e86; }
.interface-demo > p { margin: auto 0 0; color: #b8c7cf; font-size: 12px; }
.selector-section { background: #fff; }
.selector-layout { display: grid; grid-template-columns: minmax(0, 0.8fr) minmax(420px, 1.2fr); gap: 90px; align-items: start; }
.selector-copy h3 { margin: 0 0 14px; font-size: 27px; }
.selector-copy p { color: var(--muted); }
.text-link { color: var(--accent-dark); font-weight: 800; border-bottom: 1px solid currentColor; }
.step-list { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.step-list li { display: grid; grid-template-columns: 50px 1fr; gap: 18px; padding: 18px 0; border-bottom: 1px solid var(--line); }
.step-list li > span { color: var(--accent); font-size: 12px; font-weight: 800; }
.step-list strong, .step-list small { display: block; }
.step-list small { color: var(--muted); }
.faq-preview { background: var(--paper); }
.question-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.question-grid a { min-height: 155px; padding: 22px; background: #fff; border: 1px solid var(--line); border-radius: 8px; display: grid; grid-template-columns: 1fr auto; align-content: space-between; }
.question-grid a span { grid-column: 1 / -1; color: var(--accent-dark); font-size: 12px; font-weight: 800; }
.question-grid a strong { margin-top: 30px; font-size: 17px; }
.question-grid a i { align-self: end; color: var(--accent); font-style: normal; }
.download-band { padding: 46px 0; color: #fff; background: var(--deep); }
.download-inner { display: flex; justify-content: space-between; align-items: center; gap: 30px; }
.download-inner span { color: #c6d2d8; font-size: 13px; }
.download-inner h2 { margin: 5px 0 0; font-size: 30px; }
.button-light { color: var(--deep); background: #fff; }
.button-outline-light { color: #fff; border-color: rgba(255,255,255,.48); }
.site-footer { color: #68737c; background: #f4f6f7; border-top: 1px solid var(--line); }
.footer-inner { width: min(1180px, calc(100% - 40px)); margin: 0 auto; padding: 26px 0; text-align: center; font-size: 13px; }
.footer-inner p { margin: 4px 0; }
.sub-hero { background: #f3f6f7; border-bottom: 1px solid var(--line); }
.sub-hero-inner { width: min(1180px, calc(100% - 40px)); min-height: 340px; margin: 0 auto; padding: 58px 0; display: flex; justify-content: space-between; align-items: end; gap: 50px; }
.sub-hero h1 { max-width: 760px; margin: 12px 0 14px; font-size: clamp(34px, 4vw, 52px); line-height: 1.2; }
.sub-hero p { max-width: 760px; margin-bottom: 0; color: var(--muted); }
.article-wrap { width: min(1180px, calc(100% - 40px)); margin: 0 auto; padding: 70px 0 90px; display: grid; grid-template-columns: 210px minmax(0, 760px); justify-content: space-between; gap: 70px; }
.article-index { position: sticky; top: 100px; align-self: start; display: flex; flex-direction: column; border-top: 3px solid var(--accent); }
.article-index strong { padding: 16px 0 10px; }
.article-index a { padding: 9px 0; color: var(--muted); border-top: 1px solid var(--line); }
.article-content section { position: relative; padding: 0 0 42px 68px; border-left: 1px solid var(--line); }
.article-content section:last-of-type { padding-bottom: 10px; }
.article-content h2 { font-size: 27px; }
.article-content p { color: #4e5963; }
.article-content a { color: var(--accent-dark); font-weight: 700; }
.step-number { position: absolute; left: -21px; top: 0; width: 42px; height: 42px; color: #fff; background: var(--accent); border-radius: 50%; display: grid; place-items: center; font-size: 12px; font-weight: 800; }
.article-download, .faq-closing { margin-top: 38px; padding: 24px; background: var(--paper); border: 1px solid var(--line); border-radius: 8px; display: flex; justify-content: space-between; align-items: center; gap: 24px; }
.article-download strong, .article-download span { display: block; }
.article-download span { color: var(--muted); font-size: 13px; }
.faq-wrap { width: min(980px, calc(100% - 40px)); margin: 0 auto; padding: 64px 0 90px; }
.faq-intro { margin-bottom: 30px; padding: 20px 22px; background: var(--paper); border-left: 4px solid var(--accent); }
.faq-intro span { display: block; color: var(--accent-dark); font-size: 12px; font-weight: 800; }
.faq-intro strong { font-size: 19px; }
.faq-intro p { margin: 6px 0 0; color: var(--muted); }
.faq-item { border-top: 1px solid var(--line); }
.faq-item:last-child { border-bottom: 1px solid var(--line); }
.faq-item button { width: 100%; min-height: 74px; padding: 16px 4px; display: grid; grid-template-columns: 48px 1fr 28px; gap: 14px; align-items: center; color: var(--ink); background: transparent; border: 0; text-align: left; cursor: pointer; }
.faq-item button span { color: var(--accent); font-size: 12px; font-weight: 800; }
.faq-item button i { font-size: 24px; font-style: normal; text-align: center; transition: transform .2s ease; }
.faq-answer { display: none; padding: 0 46px 20px 66px; color: var(--muted); }
.faq-answer p { margin: 0; }
.faq-item.open .faq-answer { display: block; }
.faq-item.open button i { transform: rotate(45deg); }
.faq-closing a { color: var(--accent-dark); font-weight: 700; }
.faq-closing p { margin: 4px 0 0; color: var(--muted); }
@media (max-width: 900px) {
  .header-inner { width: min(100% - 28px, 720px); }
  .menu-button { display: block; margin-left: auto; }
  .header-download { display: none; }
  .site-nav { display: none; position: absolute; top: 72px; left: 14px; right: 14px; padding: 10px; background: #fff; border: 1px solid var(--line); box-shadow: var(--shadow); }
  .site-nav.open { display: grid; }
  .site-nav a { padding: 12px; }
  .hero-inner { width: min(100% - 32px, 720px); min-height: auto; padding: 42px 0 34px; grid-template-columns: 1fr; gap: 30px; }
  .hero-copy { order: 1; }
  .hero-stage { order: 2; min-height: 430px; }
  .hero h1 { font-size: clamp(36px, 9vw, 52px); }
  .stage-note { right: 4%; bottom: 18px; }
  .section { padding: 62px 0; }
  .section-inner, .sub-hero-inner, .article-wrap, .faq-wrap, .footer-inner { width: min(100% - 32px, 720px); }
  .rail-layout, .selector-layout { grid-template-columns: 1fr; gap: 34px; }
  .gallery-grid { grid-template-columns: 1fr 1fr; }
  .interface-demo { grid-column: 1 / -1; min-height: 390px; }
  .question-grid { grid-template-columns: 1fr; }
  .download-inner, .sub-hero-inner, .article-download, .faq-closing { align-items: flex-start; flex-direction: column; }
  .sub-hero-inner { min-height: auto; padding: 52px 0; }
  .article-wrap { grid-template-columns: 1fr; gap: 30px; }
  .article-index { position: static; display: grid; grid-template-columns: repeat(3, 1fr); }
  .article-index strong { grid-column: 1 / -1; }
}
@media (max-width: 560px) {
  .header-inner { height: 66px; }
  .brand img { width: 38px; height: 38px; }
  .brand span { font-size: 14px; }
  .site-nav { top: 66px; }
  .hero-inner { padding: 24px 0 20px; gap: 18px; }
  .hero h1 { margin: 10px 0 12px; font-size: 31px; line-height: 1.18; }
  .hero-lead { margin-bottom: 18px; font-size: 14px; line-height: 1.62; }
  .hero-actions .button { flex: 1 1 140px; }
  .spec-strip { display: none; }
  .hero-stage { min-height: 270px; justify-content: flex-start; padding-left: 5%; }
  .phone-frame { width: 150px; padding: 7px; border-radius: 18px; }
  .phone-frame img { border-radius: 12px; }
  .stage-note { right: 0; bottom: 10px; width: 170px; padding: 11px 12px; }
  .stage-note small { font-size: 11px; }
  .section { padding: 52px 0; }
  .section-heading h2, .rail-heading h2 { font-size: 29px; }
  .gallery-grid { grid-template-columns: 1fr; }
  .gallery-card img { height: 380px; }
  .interface-demo { grid-column: auto; min-height: 410px; }
  .selector-layout { gap: 28px; }
  .question-grid a { min-height: 130px; }
  .download-inner h2 { font-size: 25px; }
  .sub-hero h1 { font-size: 34px; }
  .article-index { grid-template-columns: 1fr 1fr; }
  .article-content section { padding-left: 42px; }
  .faq-item button { grid-template-columns: 36px 1fr 24px; }
  .faq-answer { padding-left: 50px; padding-right: 12px; }
}