:root {
  --ink: #172128;
  --muted: #5d6a70;
  --line: #d9e2e2;
  --paper: #ffffff;
  --soft: #f3f7f6;
  --primary: #0f766e;
  --primary-dark: #0b5c56;
  --accent: #c75f4b;
  --container: 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;
  font-size: 16px;
  line-height: 1.75;
}
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button, a { -webkit-tap-highlight-color: transparent; }
.section-inner, .header-inner, .hero-inner { width: min(calc(100% - 48px), var(--container)); margin: 0 auto; }
.site-header { position: sticky; top: 0; z-index: 50; background: rgba(255,255,255,.96); border-bottom: 1px solid var(--line); }
.header-inner { min-height: 72px; display: flex; align-items: center; gap: 28px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-size: 20px; font-weight: 800; }
.brand img { width: 42px; height: 42px; border-radius: 6px; }
.main-nav { display: flex; align-items: center; gap: 6px; margin-left: auto; }
.main-nav a { padding: 10px 13px; color: var(--muted); font-size: 15px; border-bottom: 2px solid transparent; }
.main-nav a:hover, .main-nav a.active { color: var(--primary-dark); border-bottom-color: var(--primary); }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 46px; padding: 0 22px; border: 1px solid var(--primary); border-radius: 6px; color: #fff; background: var(--primary); font-weight: 700; }
.button:hover { background: var(--primary-dark); border-color: var(--primary-dark); }
.header-download { min-height: 40px; padding: 0 18px; }
.menu-toggle { display: none; width: 42px; height: 42px; border: 1px solid var(--line); border-radius: 6px; background: #fff; color: var(--ink); font-size: 22px; }
.hero { overflow: hidden; background: linear-gradient(180deg, #f4f8f7 0%, #fff 100%); border-bottom: 1px solid var(--line); }
.hero-inner { min-height: 640px; display: grid; grid-template-columns: minmax(0, .93fr) minmax(440px, 1.07fr); gap: 62px; align-items: center; padding: 58px 0 52px; }
.eyebrow, .section-index { display: block; color: var(--primary-dark); font-size: 12px; line-height: 1.4; font-weight: 800; letter-spacing: 0; text-transform: uppercase; }
h1, h2, h3, p { margin-top: 0; }
h1 { max-width: 620px; margin-bottom: 22px; font-size: clamp(42px, 4.3vw, 64px); line-height: 1.12; letter-spacing: 0; }
.hero-copy > p { max-width: 610px; margin-bottom: 28px; color: #415158; font-size: 18px; line-height: 1.85; }
.hero-actions { display: flex; align-items: center; gap: 22px; flex-wrap: wrap; }
.text-link { color: var(--primary-dark); font-weight: 700; }
.text-link span { display: inline-block; margin-left: 4px; }
.hero-facts { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0; margin: 38px 0 0; border-top: 1px solid var(--line); }
.hero-facts div { padding: 16px 16px 0 0; }
.hero-facts dt { color: var(--muted); font-size: 12px; }
.hero-facts dd { margin: 2px 0 0; font-weight: 700; }
.hero-media { position: relative; height: 510px; }
.hero-shot { position: absolute; margin: 0; overflow: hidden; background: #fff; border: 1px solid #cad5d4; border-radius: 6px; box-shadow: 0 20px 48px rgba(25,53,51,.16); }
.hero-shot img { width: 100%; height: 100%; object-fit: cover; object-position: top; }
.main-shot { width: 272px; height: 484px; left: 70px; top: 14px; z-index: 2; }
.side-shot { width: 150px; z-index: 3; }
.top-shot { height: 250px; right: 4px; top: 0; }
.bottom-shot { height: 238px; right: 40px; bottom: 0; }
.fact-band { border-bottom: 1px solid var(--line); background: #fff; }
.fact-grid { display: grid; grid-template-columns: repeat(3, 1fr); }
.fact-grid > div { min-height: 102px; display: flex; align-items: center; gap: 16px; padding: 24px 30px; border-left: 1px solid var(--line); }
.fact-grid > div:last-child { border-right: 1px solid var(--line); }
.fact-grid strong { color: var(--accent); font-size: 14px; }
.fact-grid span { font-weight: 650; line-height: 1.55; }
.section { padding: 92px 0; }
.section-heading { display: grid; grid-template-columns: 140px minmax(180px, .65fr) minmax(280px, 1fr); gap: 28px; align-items: start; margin-bottom: 46px; }
.section-heading h2, .path-copy h2, .faq-intro h2 { margin: -7px 0 0; font-size: 34px; line-height: 1.3; }
.section-note { color: var(--muted); }
.gallery-grid { display: grid; grid-template-columns: 1.1fr 1fr .9fr; gap: 24px; align-items: end; }
.gallery-card { margin: 0; display: grid; grid-template-rows: 430px auto; border-top: 3px solid var(--primary); background: var(--soft); }
.gallery-card img { max-width: 400px; width: 100%; height: 430px; object-fit: contain; object-position: center bottom; padding: 24px 18px 0; margin: 0 auto; }
.gallery-card figcaption { min-height: 142px; padding: 20px; background: #fff; border: 1px solid var(--line); border-top: 0; }
.gallery-card figcaption strong, .gallery-card figcaption span { display: block; }
.gallery-card figcaption span { margin-top: 7px; color: var(--muted); font-size: 14px; }
.compact-card { grid-template-rows: 360px auto; }
.compact-card img { height: 360px; }
.feature-section { background: #f5f7f7; }
.feature-layout { display: grid; grid-template-columns: 280px 1fr; gap: 72px; }
.compact-heading { display: block; margin: 0; }
.compact-heading h2 { margin-top: 14px; }
.feature-list { border-top: 1px solid #bcc9c8; }
.feature-list article { display: grid; grid-template-columns: 52px 1fr; gap: 18px; padding: 25px 0; border-bottom: 1px solid #cbd5d4; }
.feature-list article > span { color: var(--accent); font-weight: 800; }
.feature-list h3 { margin-bottom: 6px; font-size: 20px; }
.feature-list p { margin-bottom: 0; color: var(--muted); }
.path-grid { display: grid; grid-template-columns: .8fr 1.2fr; gap: 84px; }
.path-note { margin-bottom: 16px; color: var(--muted); }
.path-copy h2 { margin: 14px 0 18px; }
.step-list { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.step-list li { display: grid; grid-template-columns: 52px 1fr; gap: 18px; padding: 24px 0; border-bottom: 1px solid var(--line); }
.step-list li > span { width: 36px; height: 36px; display: grid; place-items: center; border-radius: 50%; color: #fff; background: var(--primary); font-weight: 800; }
.step-list strong { font-size: 19px; }
.step-list p { margin-bottom: 0; color: var(--muted); }
.faq-preview { background: var(--soft); }
.question-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.question-grid a { min-height: 150px; padding: 24px; background: #fff; border: 1px solid var(--line); border-radius: 6px; }
.question-grid strong, .question-grid span { display: block; }
.question-grid strong { font-size: 18px; }
.question-grid span { margin-top: 10px; color: var(--muted); font-size: 14px; }
.secondary-button { margin-top: 28px; color: var(--primary-dark); background: transparent; }
.secondary-button:hover { color: #fff; }
.final-cta { padding: 58px 0; color: #fff; background: #193c39; }
.final-cta-inner { display: flex; align-items: center; justify-content: space-between; gap: 30px; }
.final-cta h2 { margin: 10px 0 0; font-size: 32px; }
.final-cta .section-index { color: #9bd2cc; }
.light-button { color: #153d38; background: #fff; border-color: #fff; }
.light-button:hover { color: #fff; }
.site-footer { padding: 32px 0; color: #657277; background: #fff; font-size: 13px; border-top: 1px solid var(--line); }
.footer-inner { text-align: center; }
.footer-inner p { margin: 3px 0; text-align: center; }
.inner-hero { padding: 72px 0; background: var(--soft); border-bottom: 1px solid var(--line); }
.inner-hero-grid { display: grid; grid-template-columns: 1fr 190px; gap: 64px; align-items: end; }
.inner-hero h1 { margin: 14px 0 20px; font-size: 48px; }
.inner-hero p { max-width: 750px; margin: 0; color: var(--muted); font-size: 18px; }
.inner-hero-mark { padding: 24px 0 4px 24px; border-left: 1px solid var(--line); }
.inner-hero-mark strong, .inner-hero-mark span { display: block; }
.inner-hero-mark strong { color: var(--primary); font-size: 56px; line-height: 1; }
.inner-hero-mark span { margin-top: 8px; color: var(--muted); }
.article-layout { display: grid; grid-template-columns: 220px minmax(0, 760px); gap: 74px; justify-content: center; }
.article-nav { position: sticky; top: 104px; align-self: start; display: grid; gap: 5px; padding: 20px; border: 1px solid var(--line); border-radius: 6px; }
.article-nav strong { margin-bottom: 8px; }
.article-nav a { padding: 7px 0; color: var(--muted); font-size: 14px; }
.article-nav a:hover { color: var(--primary-dark); }
.article-content section { scroll-margin-top: 100px; padding-bottom: 50px; }
.article-content h2 { margin: 10px 0 18px; font-size: 29px; }
.article-content p { color: #47575d; }
.article-content a { color: var(--primary-dark); font-weight: 700; }
.article-cta { display: flex; align-items: center; justify-content: space-between; gap: 24px; padding: 26px; background: var(--soft); border-left: 4px solid var(--primary); }
.article-cta p { margin: 4px 0 0; }
.faq-layout { display: grid; grid-template-columns: 300px minmax(0, 760px); gap: 70px; justify-content: center; }
.faq-intro { position: sticky; top: 104px; align-self: start; }
.faq-intro h2 { margin: 13px 0 16px; }
.faq-intro p { color: var(--muted); }
.accordion { border-top: 1px solid var(--line); }
.accordion article { border-bottom: 1px solid var(--line); scroll-margin-top: 100px; }
.accordion button { width: 100%; min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 17px 0; border: 0; background: transparent; color: var(--ink); font: inherit; font-weight: 750; text-align: left; cursor: pointer; }
.accordion button b { color: var(--primary); font-size: 23px; }
.answer { padding: 0 38px 20px 0; color: var(--muted); }
.answer p { margin: 0; }

@media (max-width: 960px) {
  .header-inner { gap: 14px; }
  .header-download { display: none; }
  .hero-inner { grid-template-columns: 1fr 390px; gap: 30px; }
  .hero-media { transform: scale(.88); transform-origin: center; }
  .section-heading { grid-template-columns: 110px 220px 1fr; }
  .gallery-grid { grid-template-columns: repeat(3, 1fr); }
  .feature-layout, .path-grid { gap: 42px; }
  .article-layout, .faq-layout { grid-template-columns: 190px minmax(0, 1fr); gap: 42px; }
}

@media (max-width: 720px) {
  .section-inner, .header-inner, .hero-inner { width: min(calc(100% - 32px), var(--container)); }
  .header-inner { min-height: 64px; }
  .brand img { width: 38px; height: 38px; }
  .menu-toggle { display: grid; place-items: center; margin-left: auto; }
  .main-nav { position: absolute; top: 64px; left: 16px; right: 16px; display: none; padding: 10px; background: #fff; border: 1px solid var(--line); box-shadow: 0 18px 40px rgba(20,40,38,.14); }
  .main-nav.open { display: grid; }
  .main-nav a { padding: 12px 14px; border: 0; }
  .hero-inner { min-height: auto; grid-template-columns: 1fr; gap: 32px; padding: 42px 0 32px; }
  h1 { font-size: 38px; line-height: 1.16; }
  .hero-copy > p { font-size: 16px; line-height: 1.75; }
  .hero-facts { display: none; }
  .hero-media { width: 100%; height: 222px; transform: none; }
  .main-shot { width: 120px; height: 214px; left: calc(50% - 92px); top: 4px; }
  .top-shot { width: 88px; height: 146px; right: calc(50% - 118px); }
  .bottom-shot { width: 82px; height: 146px; right: calc(50% - 106px); bottom: 0; }
  .fact-grid { grid-template-columns: 1fr; padding: 8px 0; }
  .fact-grid > div { min-height: auto; padding: 14px 0; border: 0; border-bottom: 1px solid var(--line); }
  .fact-grid > div:last-child { border-right: 0; border-bottom: 0; }
  .section { padding: 64px 0; }
  .section-heading { display: block; margin-bottom: 28px; }
  .section-heading h2, .path-copy h2, .faq-intro h2 { margin: 10px 0 14px; font-size: 29px; }
  .section-note { font-size: 14px; }
  .gallery-grid { grid-template-columns: 1fr; gap: 18px; }
  .gallery-card, .compact-card { grid-template-rows: 330px auto; }
  .gallery-card img, .compact-card img { height: 330px; }
  .gallery-card figcaption { min-height: auto; }
  .feature-layout, .path-grid { grid-template-columns: 1fr; gap: 30px; }
  .question-grid { grid-template-columns: 1fr; }
  .question-grid a { min-height: auto; }
  .final-cta { padding: 44px 0; }
  .final-cta-inner { align-items: flex-start; flex-direction: column; }
  .final-cta h2 { font-size: 27px; }
  .inner-hero { padding: 48px 0; }
  .inner-hero-grid { grid-template-columns: 1fr; gap: 26px; }
  .inner-hero h1 { font-size: 37px; }
  .inner-hero-mark { padding: 18px 0 0; border-left: 0; border-top: 1px solid var(--line); }
  .article-layout, .faq-layout { grid-template-columns: 1fr; gap: 36px; }
  .article-nav, .faq-intro { position: static; }
  .article-nav { grid-template-columns: repeat(2, 1fr); }
  .article-nav strong { grid-column: 1 / -1; }
  .article-content h2 { font-size: 26px; }
  .article-cta { align-items: flex-start; flex-direction: column; }
}