:root {
  --accent: #007f82;
  --accent-2: #d84b3f;
  --highlight: #f2c84b;
  --ink: #162a2b;
  --paper: #f7f5ef;
  --white: #ffffff;
  --line: rgba(22, 35, 38, 0.16);
  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(--paper); line-height: 1.75; letter-spacing: 0; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; height: auto; }
button { font: inherit; }
.site-header { position: relative; z-index: 20; border-bottom: 1px solid var(--line); background: rgba(255,255,255,.94); }
.header-inner, .hero-inner, .section-inner, .footer-inner, .inner-main { width: min(1180px, calc(100% - 48px)); margin: 0 auto; }
.header-inner { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 28px; }
.brand { display: inline-flex; align-items: center; gap: 11px; font-weight: 800; white-space: nowrap; }
.brand img, .footer-brand img { width: 42px; height: 42px; border: 1px solid var(--line); }
.site-nav { display: flex; align-items: center; gap: 26px; font-size: 14px; font-weight: 650; }
.site-nav a { padding: 8px 0; }
.site-nav .active { color: var(--accent); }
.site-nav .nav-download { padding: 10px 18px; background: var(--ink); color: #fff; }
.menu-toggle { display: none; width: 42px; height: 42px; border: 1px solid var(--line); background: var(--white); align-items: center; justify-content: center; flex-direction: column; gap: 4px; }
.menu-toggle span { width: 18px; height: 2px; background: var(--ink); }
.hero { overflow: hidden; border-bottom: 1px solid var(--line); }
.hero-inner { min-height: 620px; padding: 46px 0 42px; display: grid; grid-template-columns: minmax(0, 1.02fr) minmax(430px, .98fr); align-items: center; gap: 56px; }
.eyebrow { display: inline-block; color: var(--accent); font-size: 12px; font-weight: 850; text-transform: uppercase; }
h1, h2, h3, p { margin-top: 0; }
h1 { max-width: 680px; margin-bottom: 18px; font-size: 48px; line-height: 1.16; }
.h1-value { display: inline-block; white-space: nowrap; }
.hero-copy > p { max-width: 640px; margin-bottom: 26px; font-size: 17px; color: color-mix(in srgb, var(--ink) 77%, transparent); }
.hero-actions { display: flex; align-items: center; gap: 22px; margin-bottom: 25px; }
.button { display: inline-flex; min-height: 46px; padding: 10px 22px; align-items: center; justify-content: center; border: 1px solid var(--ink); font-weight: 800; }
.button.primary { color: #fff; background: var(--accent); border-color: var(--accent); }
.button.secondary { background: transparent; }
.button.light { color: var(--ink); background: #fff; border-color: #fff; }
.text-link { color: var(--accent); font-weight: 750; border-bottom: 1px solid currentColor; }
.hero-tags { display: flex; flex-wrap: wrap; gap: 8px; padding: 0; margin: 0; list-style: none; }
.hero-tags li { padding: 6px 11px; border: 1px solid var(--line); background: rgba(255,255,255,.7); font-size: 12px; }
.hero-media { position: relative; height: 520px; min-width: 0; }
.screen { position: absolute; width: auto; max-width: 400px; object-fit: contain; border: 8px solid var(--ink); background: #fff; box-shadow: 18px 20px 0 color-mix(in srgb, var(--accent) 16%, transparent); }
.screen-a { z-index: 3; height: 410px; left: 12%; top: 54px; }
.screen-b { z-index: 2; height: 330px; right: 3%; top: 8px; }
.screen-c { z-index: 1; height: 300px; right: 0; bottom: 0; }
.media-index { position: absolute; z-index: 5; left: 0; top: 4px; display: grid; color: var(--accent-2); }
.media-index b { font-size: 28px; line-height: 1; }
.media-index span { writing-mode: vertical-rl; font-size: 11px; margin-top: 9px; }
.section { padding: 78px 0; border-bottom: 1px solid var(--line); }
.section-heading { display: grid; grid-template-columns: 42px auto 1fr; align-items: baseline; gap: 16px; margin-bottom: 34px; }
.section-heading > span { color: var(--accent-2); font-size: 12px; font-weight: 850; }
.section-heading h2 { margin: 0; font-size: 32px; line-height: 1.25; }
.section-note { max-width: 650px; justify-self: end; color: color-mix(in srgb, var(--ink) 70%, transparent); }
.feature-grid { display: grid; grid-template-columns: repeat(4, 1fr); border: 1px solid var(--line); }
.feature-grid article { min-height: 230px; padding: 28px; border-right: 1px solid var(--line); background: rgba(255,255,255,.56); }
.feature-grid article:last-child { border-right: 0; }
.feature-grid b { color: var(--accent-2); font-size: 12px; }
.feature-grid h3 { margin: 48px 0 10px; font-size: 19px; }
.feature-grid p { margin: 0; font-size: 14px; color: color-mix(in srgb, var(--ink) 72%, transparent); }
.gallery-section { background: var(--ink); color: #fff; }
.gallery-section .section-heading > span { color: var(--highlight); }
.gallery-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; align-items: end; }
.gallery-grid figure { margin: 0; padding: 18px; border: 1px solid rgba(255,255,255,.24); background: rgba(255,255,255,.06); }
.gallery-grid img { width: auto; height: 360px; margin: 0 auto 18px; object-fit: contain; }
.gallery-grid figcaption { display: grid; gap: 3px; }
.gallery-grid figcaption span { color: rgba(255,255,255,.7); font-size: 13px; }
.route-grid { display: grid; grid-template-columns: .9fr 1.1fr; gap: 70px; align-items: center; }
.route-copy p { margin-bottom: 24px; }
.route-list { padding: 0; margin: 0; list-style: none; border-top: 1px solid var(--line); }
.route-list li { display: grid; grid-template-columns: 70px 1fr; padding: 17px 4px; border-bottom: 1px solid var(--line); }
.route-list b { color: var(--accent-2); }
.faq-preview-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.faq-preview-grid a { min-height: 140px; padding: 24px; border: 1px solid var(--line); background: #fff; display: flex; flex-direction: column; justify-content: space-between; }
.faq-preview-grid span { color: var(--accent); font-size: 12px; font-weight: 800; }
.download-band { width: min(1180px, calc(100% - 48px)); margin: 70px auto; padding: 34px 38px; background: var(--accent); color: #fff; display: flex; align-items: center; justify-content: space-between; gap: 28px; }
.download-band h2 { margin: 4px 0 0; font-size: 27px; }
.site-footer { border-top: 1px solid var(--line); background: #fff; }
.footer-inner { padding: 42px 0; display: grid; justify-items: center; text-align: center; gap: 12px; }
.footer-brand { display: flex; align-items: center; gap: 10px; }
.footer-inner p { margin: 0; max-width: 760px; font-size: 13px; color: color-mix(in srgb, var(--ink) 68%, transparent); }
.inner-main { padding-top: 52px; padding-bottom: 80px; }
.inner-hero, .faq-hero { min-height: 410px; display: grid; grid-template-columns: 1fr 340px; gap: 65px; align-items: center; padding: 32px 0 54px; border-bottom: 1px solid var(--line); }
.inner-hero h1, .faq-hero h1 { margin: 8px 0 16px; font-size: 42px; }
.inner-hero > div > p, .faq-hero > div > p { max-width: 720px; }
.inner-hero img { width: auto; height: 320px; margin: 0 auto; object-fit: contain; border: 7px solid var(--ink); }
.guide-list { padding: 56px 0; display: grid; gap: 0; }
.guide-step { display: grid; grid-template-columns: 90px 1fr; gap: 24px; padding: 30px 0; border-bottom: 1px solid var(--line); }
.guide-step > span { font-size: 30px; color: var(--accent-2); font-weight: 900; }
.guide-step h2 { margin-bottom: 8px; font-size: 23px; }
.guide-step p { margin: 0; }
.safety-panel { padding: 34px; background: var(--ink); color: #fff; display: flex; align-items: center; justify-content: space-between; gap: 28px; }
.safety-panel h2 { margin: 3px 0 7px; }
.safety-panel p { margin: 0; max-width: 760px; color: rgba(255,255,255,.72); }
.faq-legend { padding: 25px; border: 1px solid var(--line); background: #fff; }
.faq-legend ol { margin-bottom: 0; padding-left: 22px; }
.faq-list { padding: 55px 0; }
.faq-item { border-bottom: 1px solid var(--line); scroll-margin-top: 20px; }
.faq-item h2 { margin: 0; }
.faq-item button { width: 100%; min-height: 76px; padding: 16px 0; border: 0; background: transparent; color: var(--ink); display: grid; grid-template-columns: 52px 1fr 32px; align-items: center; text-align: left; cursor: pointer; font-size: 18px; font-weight: 800; }
.faq-item button span { color: var(--accent-2); font-size: 12px; }
.faq-item button i { font-style: normal; font-size: 24px; text-align: center; }
.faq-answer { display: none; padding: 0 45px 24px 52px; }
.faq-answer p { margin: 0; }
.faq-item.open .faq-answer { display: block; }
.faq-item.open button i { transform: rotate(45deg); }
.theme-timeline .hero-media { transform: rotate(-2deg); }
.theme-timeline .screen-a { left: 18%; top: 55px; height: 390px; }
.theme-timeline .screen-b { right: 4%; top: 35px; height: 270px; transform: rotate(7deg); }
.theme-timeline .screen-c { right: 5%; bottom: 12px; height: 275px; transform: rotate(-5deg); }
.theme-timeline .feature-grid { border-radius: 0 0 40px 0; overflow: hidden; }
.theme-archive .hero-media { border-left: 18px solid var(--accent); border-bottom: 1px solid var(--ink); }
.theme-archive .screen-a { left: 24%; top: 36px; height: 430px; }
.theme-archive .screen-b { left: 1%; top: 92px; height: 260px; }
.theme-archive .screen-c { right: 0; bottom: 18px; height: 250px; }
.theme-archive .feature-grid article { background: transparent; }
.theme-quadrant .hero-media { background: repeating-linear-gradient(90deg, transparent 0 78px, var(--line) 78px 79px), repeating-linear-gradient(0deg, transparent 0 78px, var(--line) 78px 79px); }
.theme-quadrant .screen-a { left: 8%; top: 62px; height: 380px; }
.theme-quadrant .screen-b { right: 2%; top: 24px; height: 310px; }
.theme-quadrant .screen-c { right: 6%; bottom: 0; height: 240px; }
.theme-field-notes .hero-media { border: 1px dashed var(--accent); transform: rotate(1deg); }
.theme-field-notes .screen-a { left: 20%; top: 45px; height: 420px; transform: rotate(-3deg); }
.theme-field-notes .screen-b { right: 2%; top: 32px; height: 260px; transform: rotate(4deg); }
.theme-field-notes .screen-c { right: 3%; bottom: 12px; height: 240px; transform: rotate(2deg); }
.theme-field-notes .feature-grid { gap: 12px; border: 0; }
.theme-field-notes .feature-grid article { border: 1px dashed var(--line); }
@media (max-width: 900px) {
  .header-inner, .hero-inner, .section-inner, .footer-inner, .inner-main { width: min(100% - 30px, 680px); }
  .menu-toggle { display: flex; }
  .site-nav { position: absolute; display: none; left: 15px; right: 15px; top: 66px; padding: 18px; background: #fff; border: 1px solid var(--line); flex-direction: column; align-items: stretch; gap: 4px; }
  .site-nav.open { display: flex; }
  .site-nav a { padding: 10px; }
  .hero-inner { min-height: 0; padding: 30px 0 24px; grid-template-columns: 1fr; gap: 18px; }
  h1 { font-size: 36px; }
  .hero-copy > p { margin-bottom: 18px; font-size: 15px; }
  .hero-actions { margin-bottom: 16px; }
  .hero-media { height: 270px; transform: none !important; }
  .screen { border-width: 5px; box-shadow: 9px 10px 0 color-mix(in srgb, var(--accent) 16%, transparent); }
  .screen-a, .theme-timeline .screen-a, .theme-archive .screen-a, .theme-quadrant .screen-a, .theme-field-notes .screen-a { left: 23%; top: 5px; height: 255px; transform: none; }
  .screen-b, .theme-timeline .screen-b, .theme-archive .screen-b, .theme-quadrant .screen-b, .theme-field-notes .screen-b { left: 3%; right: auto; top: 35px; height: 185px; transform: rotate(-4deg); }
  .screen-c, .theme-timeline .screen-c, .theme-archive .screen-c, .theme-quadrant .screen-c, .theme-field-notes .screen-c { right: 2%; bottom: 4px; height: 175px; transform: rotate(4deg); }
  .media-index { display: none; }
  .section { padding: 52px 0; }
  .section-heading { grid-template-columns: 32px 1fr; gap: 8px; }
  .section-heading h2 { font-size: 26px; }
  .section-note { grid-column: 2; justify-self: start; }
  .feature-grid { grid-template-columns: 1fr 1fr; }
  .feature-grid article:nth-child(2) { border-right: 0; }
  .feature-grid article:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .gallery-grid { grid-template-columns: 1fr; }
  .gallery-grid img { height: 300px; }
  .route-grid, .inner-hero, .faq-hero { grid-template-columns: 1fr; gap: 28px; }
  .faq-preview-grid { grid-template-columns: 1fr; }
  .download-band { width: calc(100% - 30px); margin: 48px auto; padding: 27px; flex-direction: column; align-items: flex-start; }
  .inner-hero, .faq-hero { min-height: 0; padding: 12px 0 38px; }
  .inner-hero h1, .faq-hero h1 { font-size: 34px; }
  .inner-hero img { height: 270px; }
  .safety-panel { flex-direction: column; align-items: flex-start; }
}
@media (max-width: 520px) {
  .header-inner { min-height: 64px; }
  .brand img { width: 36px; height: 36px; }
  .brand span { font-size: 14px; }
  h1 { font-size: 31px; }
  .hero-tags li:nth-child(3) { display: none; }
  .feature-grid { grid-template-columns: 1fr; }
  .feature-grid article { min-height: 0; border-right: 0; border-bottom: 1px solid var(--line); }
  .feature-grid article:last-child { border-bottom: 0; }
  .feature-grid article h3 { margin-top: 20px; }
  .guide-step { grid-template-columns: 52px 1fr; gap: 12px; }
  .faq-item button { grid-template-columns: 38px 1fr 24px; font-size: 16px; }
  .faq-answer { padding-left: 38px; padding-right: 12px; }
}