:root {
  --guide-ink: #071d2b;
  --guide-blue: #0c3851;
  --guide-paper: #f7faf9;
  --guide-white: #ffffff;
  --guide-text: #20313a;
  --guide-muted: #63757f;
  --guide-line: #d8e2e5;
  --guide-green: #39d98a;
  --guide-orange: #f2763d;
  --guide-yellow: #f2c84b;
  --guide-cyan: #28a9c7;
  --guide-radius: 6px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--guide-text); background: var(--guide-paper); font-family: Aptos, "Microsoft YaHei", "Segoe UI", sans-serif; line-height: 1.65; }
a { color: inherit; text-decoration: none; }
img, video { display: block; max-width: 100%; }
h1, h2, h3, p { margin-top: 0; }
h1, h2, h3 { color: var(--guide-ink); font-family: Bahnschrift, "DIN Alternate", Aptos, sans-serif; letter-spacing: 0; line-height: 1.08; }

.guide-header { position: sticky; top: 0; z-index: 20; border-bottom: 1px solid rgba(216,226,229,.9); background: rgba(255,255,255,.95); backdrop-filter: blur(12px); }
.guide-nav { display: flex; align-items: center; justify-content: space-between; width: min(1160px, calc(100% - 40px)); min-height: 70px; margin: 0 auto; gap: 24px; }
.guide-brand { display: flex; align-items: center; gap: 11px; min-width: 0; }
.guide-brand img { width: 40px; height: 40px; }
.guide-brand strong, .guide-brand small { display: block; }
.guide-brand strong { color: var(--guide-ink); font-size: 15px; }
.guide-brand small { color: var(--guide-muted); font-size: 10px; font-weight: 800; }
.guide-links { display: flex; align-items: center; gap: 20px; color: var(--guide-muted); font-size: 14px; font-weight: 700; }
.guide-links a:hover { color: var(--guide-ink); }
.guide-links .guide-cta { padding: 9px 13px; border-radius: 4px; background: var(--guide-ink); color: white; }

.guide-hero { position: relative; overflow: hidden; color: white; background: var(--guide-ink); }
.guide-hero::after { content: ""; position: absolute; right: 0; bottom: 0; width: 30%; height: 8px; background: var(--guide-orange); }
.guide-hero-inner { display: grid; grid-template-columns: minmax(0,1.05fr) minmax(360px,.75fr); align-items: center; gap: 68px; width: min(1160px, calc(100% - 40px)); min-height: 520px; margin: 0 auto; padding: 72px 0; }
.guide-hero-copy { position: relative; z-index: 1; }
.guide-kicker { margin-bottom: 18px; color: #91e5f5; font-size: 12px; font-weight: 900; letter-spacing: .11em; text-transform: uppercase; }
.guide-hero h1 { max-width: 760px; margin-bottom: 23px; color: white; font-size: clamp(44px,5.5vw,76px); }
.guide-hero-copy > p:not(.guide-kicker) { max-width: 720px; color: #c5d6df; font-size: 18px; }
.guide-hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.guide-button { display: inline-flex; align-items: center; justify-content: center; min-height: 44px; padding: 0 17px; border: 1px solid rgba(255,255,255,.3); border-radius: 4px; color: white; font-weight: 900; }
.guide-button.primary { border-color: var(--guide-green); background: var(--guide-green); color: var(--guide-ink); }
.guide-visual { position: relative; border: 1px solid rgba(255,255,255,.18); background: #031017; box-shadow: 0 28px 80px rgba(0,0,0,.3); }
.guide-visual img, .guide-visual video { width: 100%; aspect-ratio: 16 / 10; object-fit: cover; }
.guide-visual figcaption { display: flex; justify-content: space-between; gap: 18px; padding: 14px 16px; color: #a9bdc8; font-size: 12px; }
.guide-visual figcaption strong { color: var(--guide-green); }

.answer-band { border-bottom: 1px solid var(--guide-line); background: white; }
.answer-inner { display: grid; grid-template-columns: 190px minmax(0,1fr); gap: 38px; width: min(980px, calc(100% - 40px)); margin: 0 auto; padding: 38px 0; }
.answer-label { color: var(--guide-orange); font-size: 12px; font-weight: 900; letter-spacing: .1em; text-transform: uppercase; }
.answer-text { margin: 0; color: var(--guide-ink); font-size: 20px; font-weight: 700; }

.guide-main { width: min(1160px, calc(100% - 40px)); margin: 0 auto; padding: 78px 0 100px; }
.guide-layout { display: grid; grid-template-columns: minmax(0,1fr) 260px; align-items: start; gap: 78px; }
.guide-article { max-width: 790px; }
.guide-article section { padding: 46px 0; border-top: 1px solid var(--guide-line); }
.guide-article section:first-child { padding-top: 0; border-top: 0; }
.guide-article h2 { margin-bottom: 20px; font-size: 36px; }
.guide-article h3 { margin: 30px 0 10px; font-size: 23px; }
.guide-article p, .guide-article li { color: #40525c; }
.guide-article ul, .guide-article ol { padding-left: 22px; }
.guide-article li + li { margin-top: 9px; }
.guide-aside { position: sticky; top: 96px; border-top: 4px solid var(--guide-orange); background: white; }
.guide-aside > div { padding: 22px; border: 1px solid var(--guide-line); border-top: 0; }
.guide-aside span { display: block; margin-bottom: 12px; color: var(--guide-orange); font-size: 11px; font-weight: 900; letter-spacing: .1em; }
.guide-aside a { display: block; padding: 10px 0; border-top: 1px solid var(--guide-line); color: var(--guide-blue); font-size: 13px; font-weight: 800; }
.guide-aside a:first-of-type { border-top: 0; }

.guide-table-wrap { margin: 28px 0; overflow-x: auto; border: 1px solid var(--guide-line); background: white; }
.guide-table { width: 100%; min-width: 660px; border-collapse: collapse; }
.guide-table th, .guide-table td { padding: 16px; border-bottom: 1px solid var(--guide-line); text-align: left; vertical-align: top; }
.guide-table th { background: var(--guide-ink); color: white; font-size: 12px; letter-spacing: .06em; text-transform: uppercase; }
.guide-table tr:last-child td { border-bottom: 0; }
.guide-table strong { color: var(--guide-ink); }

.fact-grid, .hub-grid { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 16px; }
.fact { min-height: 160px; padding: 24px; border: 1px solid var(--guide-line); border-radius: var(--guide-radius); background: white; }
.fact span { color: var(--guide-orange); font-size: 11px; font-weight: 900; letter-spacing: .08em; }
.fact h3 { margin: 32px 0 8px; font-size: 22px; }
.fact p { margin-bottom: 0; font-size: 14px; }
.note { margin: 28px 0; padding: 20px 22px; border-left: 4px solid var(--guide-yellow); background: #fff9df; color: var(--guide-ink); }
.evidence-note { border-left-color: var(--guide-green); background: #ecfaf3; }

.hub-section { padding: 82px 0; }
.hub-section.white { background: white; }
.hub-inner { width: min(1160px, calc(100% - 40px)); margin: 0 auto; }
.hub-heading { display: grid; grid-template-columns: minmax(0,1fr) minmax(280px,.55fr); gap: 70px; align-items: end; margin-bottom: 38px; }
.hub-heading h2 { margin-bottom: 0; font-size: 46px; }
.hub-heading p { margin-bottom: 0; color: var(--guide-muted); }
.hub-grid { grid-template-columns: repeat(3,minmax(0,1fr)); }
.hub-card { display: grid; min-height: 310px; padding: 26px; border: 1px solid var(--guide-line); border-radius: var(--guide-radius); background: white; }
.hub-card .card-type { color: var(--guide-orange); font-size: 11px; font-weight: 900; letter-spacing: .1em; }
.hub-card h3 { margin: 72px 0 12px; font-size: 26px; }
.hub-card p { color: var(--guide-muted); font-size: 14px; }
.hub-card .card-link { align-self: end; padding-top: 18px; border-top: 1px solid var(--guide-line); color: var(--guide-blue); font-weight: 900; }
.hub-card.featured { border-color: var(--guide-blue); background: var(--guide-ink); }
.hub-card.featured h3, .hub-card.featured .card-link { color: white; }
.hub-card.featured p { color: #b9cbd4; }
.hub-card.featured .card-link { border-color: #355466; }

.storyboard-grid { display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); gap: 8px; margin: 26px 0; }
.storyboard-grid figure { margin: 0; border: 1px solid var(--guide-line); background: white; }
.storyboard-grid img { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; }
.storyboard-grid figcaption { padding: 10px; color: var(--guide-muted); font-size: 11px; }
.case-video { margin: 30px 0; padding: 9px; background: var(--guide-ink); }
.case-video video { width: 100%; aspect-ratio: 16 / 9; background: black; }

.guide-faq details { border-top: 1px solid var(--guide-line); background: white; }
.guide-faq details:last-child { border-bottom: 1px solid var(--guide-line); }
.guide-faq summary { padding: 18px 6px; color: var(--guide-ink); cursor: pointer; font-weight: 900; }
.guide-faq details p { padding: 0 6px 18px; margin: 0; }

.guide-footer { padding: 48px 0; background: var(--guide-ink); color: #9fb5c1; }
.guide-footer-inner { display: flex; align-items: flex-start; justify-content: space-between; width: min(1160px, calc(100% - 40px)); margin: 0 auto; gap: 30px; }
.guide-footer strong { display: block; color: white; }
.guide-footer small { display: block; margin-top: 5px; }
.guide-footer-links { display: flex; flex-wrap: wrap; gap: 18px; font-size: 13px; }

@media (max-width: 900px) {
  .guide-hero-inner, .guide-layout, .hub-heading { grid-template-columns: 1fr; }
  .guide-hero-inner { gap: 35px; }
  .guide-aside { position: static; }
  .hub-grid { grid-template-columns: repeat(2,minmax(0,1fr)); }
  .storyboard-grid { grid-template-columns: repeat(2,minmax(0,1fr)); }
}

@media (max-width: 620px) {
  .guide-nav { width: min(100% - 28px,1160px); min-height: 64px; }
  .guide-links a:not(.guide-cta) { display: none; }
  .guide-brand img { width: 35px; height: 35px; }
  .guide-hero-inner, .guide-main, .hub-inner { width: min(100% - 28px,1160px); }
  .guide-hero-inner { min-height: auto; padding: 52px 0 38px; }
  .guide-hero h1 { font-size: 40px; }
  .guide-visual figcaption { display: grid; }
  .answer-inner { grid-template-columns: 1fr; width: min(100% - 28px,980px); gap: 9px; padding: 27px 0; }
  .answer-text { font-size: 17px; }
  .guide-main { padding: 54px 0 70px; }
  .guide-article h2 { font-size: 31px; }
  .fact-grid, .hub-grid { grid-template-columns: 1fr; }
  .hub-section { padding: 62px 0; }
  .hub-heading { gap: 16px; }
  .hub-heading h2 { font-size: 36px; }
  .hub-card { min-height: 270px; }
  .guide-footer-inner { flex-direction: column; }
}