:root {
  --ink: #101411;
  --paper: #f5f7f2;
  --white: #ffffff;
  --line: #cfd5ca;
  --green: #b7f34a;
  --green-deep: #34724c;
  --coral: #ff725e;
  --muted: #5a625b;
  --max: 1180px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "微软雅黑", Arial, Helvetica, sans-serif; line-height: 1.75; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
.site-header { position: sticky; top: 0; z-index: 20; background: rgba(245,247,242,.96); border-bottom: 1px solid var(--ink); backdrop-filter: blur(12px); }
.header-inner { width: min(calc(100% - 48px), var(--max)); height: 70px; margin: 0 auto; display: flex; align-items: center; justify-content: space-between; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 900; font-size: 20px; }
.brand img { border-radius: 7px; }
.nav { display: flex; align-items: center; gap: 32px; font-size: 14px; font-weight: 700; }
.nav a { position: relative; }
.nav a.active::after { content: ""; position: absolute; left: 0; right: 0; bottom: -8px; height: 3px; background: var(--coral); }
.nav .nav-download { padding: 9px 17px; color: var(--paper); background: var(--ink); }
.nav .nav-download::after { display: none; }
.menu-toggle { display: none; width: 42px; height: 42px; padding: 9px; border: 1px solid var(--ink); background: transparent; }
.menu-toggle span { display: block; height: 2px; margin: 4px 0; background: var(--ink); }
.hero { border-bottom: 1px solid var(--ink); }
.hero-inner { width: min(calc(100% - 48px), var(--max)); min-height: 660px; max-height: 700px; margin: 0 auto; display: grid; grid-template-columns: minmax(0, 1fr) 470px; gap: 72px; align-items: center; padding: 42px 0 46px; }
.index-label { display: inline-flex; align-items: center; gap: 11px; margin-bottom: 20px; font-size: 12px; font-weight: 900; letter-spacing: 0; color: var(--green-deep); }
.index-label span { padding: 3px 8px; color: var(--ink); background: var(--green); }
h1, h2, h3, p { margin-top: 0; }
.hero h1 { max-width: 650px; margin-bottom: 20px; font-size: clamp(48px, 5vw, 76px); line-height: 1.06; letter-spacing: 0; }
.hero-copy > p { max-width: 690px; margin-bottom: 28px; color: #343a35; font-size: 17px; }
.hero-actions { display: flex; align-items: center; gap: 24px; margin-bottom: 32px; }
.button { display: inline-flex; min-height: 46px; align-items: center; justify-content: center; padding: 10px 24px; border: 1px solid var(--ink); font-weight: 900; }
.button.primary { background: var(--coral); box-shadow: 5px 5px 0 var(--ink); }
.button.dark { color: var(--paper); background: var(--ink); }
.text-link { border-bottom: 2px solid var(--ink); font-weight: 800; }
.hero-facts { display: grid; grid-template-columns: repeat(3, 1fr); max-width: 560px; margin: 0; border-top: 1px solid var(--line); }
.hero-facts div { padding: 14px 18px 0 0; }
.hero-facts dt { color: var(--muted); font-size: 12px; font-weight: 800; }
.hero-facts dd { margin: 3px 0 0; font-weight: 900; }
.hero-media { position: relative; min-height: 520px; display: flex; align-items: center; justify-content: center; background: var(--ink); overflow: hidden; }
.hero-media::before { content: ""; position: absolute; inset: 18px; border: 1px solid #536057; }
.hero-media img { position: relative; z-index: 2; width: 218px; max-width: 400px; height: 400px; object-fit: contain; box-shadow: 18px 18px 0 var(--green); }
.media-note { position: absolute; z-index: 3; top: 28px; left: 28px; display: grid; color: var(--paper); font-size: 12px; }
.media-note b { color: var(--green); font-size: 14px; }
.media-index { position: absolute; right: 25px; bottom: 18px; color: var(--paper); font-weight: 900; }
.section { border-bottom: 1px solid var(--ink); }
.section-inner { width: min(calc(100% - 48px), var(--max)); margin: 0 auto; padding: 78px 0; }
.section-heading { display: flex; align-items: baseline; gap: 18px; margin-bottom: 38px; }
.section-heading h2 { margin: 0; font-size: 38px; line-height: 1.2; letter-spacing: 0; }
.section-no { color: var(--coral); font-size: 13px; font-weight: 900; }
.interface { background: var(--white); }
.interface-grid { display: grid; grid-template-columns: 1.08fr .92fr; gap: 22px; }
.screen-row { min-height: 505px; display: grid; grid-template-columns: 1fr 225px; align-items: end; gap: 22px; padding: 28px; border: 1px solid var(--ink); background: var(--paper); overflow: hidden; }
.screen-row.featured { background: var(--green); }
.screen-row img { align-self: end; max-width: 400px; height: 400px; object-fit: contain; }
.screen-row h3 { margin-bottom: 12px; font-size: 25px; line-height: 1.3; }
.screen-row p { margin-bottom: 0; color: #343a35; }
.eyebrow { display: block; margin-bottom: 12px; color: var(--green-deep); font-size: 11px; font-weight: 900; }
.feature-list { border-top: 1px solid var(--ink); }
.feature-list article { display: grid; grid-template-columns: 72px 220px 1fr; gap: 26px; align-items: baseline; padding: 24px 0; border-bottom: 1px solid var(--line); }
.feature-list article > b { color: var(--coral); }
.feature-list h3, .feature-list p { margin: 0; }
.route { background: #dfe8dd; }
.route-inner { display: grid; grid-template-columns: .85fr 1.15fr; gap: 70px; }
.route-inner .section-heading { margin-bottom: 15px; }
.route-lead { max-width: 360px; color: var(--muted); }
.route ol { grid-row: span 2; margin: 0; padding: 0; list-style: none; }
.route li { display: grid; grid-template-columns: 52px 1fr; gap: 18px; padding: 20px 0; border-top: 1px solid #8a968b; }
.route li > span { font-weight: 900; color: var(--green-deep); }
.route h3 { margin-bottom: 5px; }
.route p { margin-bottom: 0; }
.route .button { align-self: end; justify-self: start; }
.faq-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.faq-grid a { min-height: 145px; display: flex; flex-direction: column; justify-content: space-between; padding: 23px; border: 1px solid var(--ink); background: var(--white); }
.faq-grid a:hover { background: var(--green); }
.faq-grid span { color: var(--muted); font-size: 14px; }
.download-band { color: var(--paper); background: var(--ink); }
.download-band .section-inner { display: flex; align-items: center; justify-content: space-between; gap: 36px; padding: 55px 0; }
.download-band h2 { margin-bottom: 4px; font-size: 34px; }
.download-note { color: #cad0ca; }
footer { background: var(--paper); }
.footer-inner { width: min(calc(100% - 48px), var(--max)); margin: 0 auto; padding: 36px 0; text-align: center; }
.footer-brand { display: flex; align-items: center; justify-content: center; gap: 8px; }
.footer-brand img { border-radius: 6px; }
.footer-inner p { max-width: 760px; margin: 18px auto 8px; color: var(--muted); font-size: 13px; text-align: center; }
.footer-inner small { color: #737a74; text-align: center; }
.inner-main { background: var(--white); }
.inner-hero { width: min(calc(100% - 48px), var(--max)); min-height: 390px; margin: 0 auto; display: grid; grid-template-columns: 1.2fr .8fr; gap: 60px; align-items: center; padding: 64px 0; border-bottom: 1px solid var(--ink); }
.inner-hero h1 { max-width: 760px; margin-bottom: 18px; font-size: clamp(40px, 5vw, 64px); line-height: 1.12; letter-spacing: 0; }
.inner-hero-copy > p { max-width: 700px; color: var(--muted); font-size: 17px; }
.guide-meter { display: grid; grid-template-columns: auto 1fr auto 1fr auto 1fr auto; align-items: center; gap: 8px; padding: 28px; border: 1px solid var(--ink); background: var(--paper); font-size: 12px; font-weight: 900; }
.guide-meter i { height: 4px; background: var(--green); }
.article-shell { width: min(calc(100% - 48px), var(--max)); margin: 0 auto; display: grid; grid-template-columns: 240px 1fr; gap: 70px; padding: 70px 0 90px; }
.article-index { position: sticky; top: 100px; align-self: start; display: grid; gap: 11px; padding: 22px; border: 1px solid var(--ink); background: var(--paper); }
.article-index a { padding-top: 8px; border-top: 1px solid var(--line); font-size: 13px; }
.article-body { max-width: 780px; }
.article-body section { padding: 0 0 42px; margin-bottom: 42px; border-bottom: 1px solid var(--line); }
.article-body h2 { margin-bottom: 18px; font-size: 32px; }
.article-body p { color: #343a35; }
code { padding: 2px 6px; background: #e4e9e2; }
.callout { margin-top: 24px; padding: 22px; border-left: 6px solid var(--coral); background: var(--paper); }
.callout p { margin: 8px 0 0; }
.article-next, .faq-end { display: flex; align-items: center; gap: 18px; justify-content: space-between; padding: 26px; background: var(--green); border: 1px solid var(--ink); }
.article-next p, .faq-end p { margin: 4px 0 0; }
.signal-panel { padding: 28px; color: var(--paper); background: var(--ink); }
.signal-panel b { color: var(--green); }
.signal-panel ol { margin: 18px 0 0; padding-left: 22px; }
.signal-panel li { padding: 7px 0; border-bottom: 1px solid #4a514b; }
.faq-shell { width: min(calc(100% - 48px), 980px); margin: 0 auto; padding: 70px 0 90px; }
.faq-intro { display: grid; grid-template-columns: 50px 230px 1fr; align-items: baseline; gap: 12px; margin-bottom: 30px; }
.faq-intro h2 { font-size: 34px; }
.faq-list { border-top: 1px solid var(--ink); }
.faq-list details { border-bottom: 1px solid var(--ink); }
.faq-list summary { position: relative; padding: 22px 52px 22px 0; cursor: pointer; font-weight: 900; list-style: none; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary span::before, .faq-list summary span::after { content: ""; position: absolute; right: 15px; top: 32px; width: 17px; height: 2px; background: var(--ink); }
.faq-list summary span::after { transform: rotate(90deg); transition: transform .2s; }
.faq-list details[open] summary span::after { transform: rotate(0); }
.faq-list details p { max-width: 830px; padding: 0 52px 22px 0; color: var(--muted); }
.faq-end { margin-top: 40px; }

@media (max-width: 900px) {
  .header-inner { width: min(calc(100% - 32px), var(--max)); height: 64px; }
  .menu-toggle { display: block; }
  .nav { position: absolute; top: 64px; left: 0; right: 0; display: none; padding: 18px 16px 24px; background: var(--paper); border-bottom: 1px solid var(--ink); }
  .nav.open { display: grid; gap: 10px; }
  .nav a { padding: 10px 0; }
  .nav a.active::after { display: none; }
  .hero-inner { width: min(calc(100% - 32px), var(--max)); min-height: auto; max-height: none; grid-template-columns: 1fr; gap: 26px; padding: 34px 0 30px; }
  .hero h1 { font-size: clamp(40px, 12vw, 58px); }
  .hero-copy > p { font-size: 15px; }
  .hero-actions { margin-bottom: 22px; }
  .hero-media { min-height: 375px; }
  .hero-media img { width: 178px; height: 326px; box-shadow: 12px 12px 0 var(--green); }
  .media-note { top: 15px; left: 17px; }
  .section-inner { width: min(calc(100% - 32px), var(--max)); padding: 58px 0; }
  .interface-grid, .route-inner { grid-template-columns: 1fr; }
  .screen-row { min-height: 430px; grid-template-columns: 1fr 175px; }
  .screen-row img { width: 175px; height: 322px; }
  .feature-list article { grid-template-columns: 46px 1fr; gap: 16px; }
  .feature-list article p { grid-column: 2; }
  .faq-grid { grid-template-columns: 1fr; }
  .download-band .section-inner { align-items: flex-start; flex-direction: column; }
  .inner-hero { width: min(calc(100% - 32px), var(--max)); grid-template-columns: 1fr; gap: 28px; padding: 44px 0; }
  .article-shell { width: min(calc(100% - 32px), var(--max)); grid-template-columns: 1fr; gap: 30px; padding: 50px 0 70px; }
  .article-index { position: static; }
  .faq-shell { width: min(calc(100% - 32px), 980px); }
  .faq-intro { grid-template-columns: 38px 1fr; }
  .faq-intro p { grid-column: 2; }
}
@media (max-width: 560px) {
  .hero-inner { gap: 16px; padding: 22px 0 20px; }
  .index-label { margin-bottom: 8px; }
  .hero h1 { margin-bottom: 10px; font-size: 38px; }
  .hero-copy > p { margin-bottom: 14px; font-size: 14px; line-height: 1.6; }
  .hero-actions { flex-direction: row; gap: 14px; margin-bottom: 0; }
  .hero-actions .button { min-height: 42px; padding: 8px 16px; }
  .hero-actions .text-link { align-self: center; font-size: 14px; }
  .hero-facts { display: none; }
  .hero-media { min-height: 260px; }
  .hero-media img { width: 124px; height: 228px; box-shadow: 8px 8px 0 var(--green); }
  .media-note { display: none; }
  .section-heading h2 { font-size: 31px; }
  .screen-row { min-height: 0; grid-template-columns: 1fr; }
  .screen-row img { justify-self: center; width: auto; height: 300px; }
  .feature-list article { grid-template-columns: 36px 1fr; }
  .inner-hero h1 { font-size: 40px; }
  .guide-meter { grid-template-columns: 1fr 1fr; }
  .guide-meter i { display: none; }
  .article-next, .faq-end { align-items: stretch; flex-direction: column; }
  .faq-end .button { width: 100%; }
  .faq-intro { display: block; }
  .faq-list summary { padding-right: 42px; }
}