:root {
  --ink: #16211f;
  --muted: #5d6b68;
  --paper: #f6f7f3;
  --white: #ffffff;
  --line: #d7ddda;
  --primary: #b93f35;
  --primary-dark: #8f2f28;
  --teal: #0b766e;
  --moss: #6b7750;
  --shadow: 0 16px 40px rgba(22, 33, 31, 0.11);
}

* {
  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;
  line-height: 1.7;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font: inherit;
}

.container {
  width: min(1180px, calc(100% - 48px));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(246, 247, 243, 0.96);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px);
}

.header-inner {
  min-height: 72px;
  display: flex;
  align-items: center;
  gap: 30px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  font-size: 20px;
  font-weight: 800;
  margin-right: auto;
}

.brand img {
  width: 38px;
  height: 38px;
  border-radius: 6px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.site-nav a {
  padding: 22px 0 18px;
  color: #46534f;
  font-size: 15px;
  border-bottom: 3px solid transparent;
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--ink);
  border-bottom-color: var(--primary);
}

.header-download,
.button {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  padding: 0 24px;
  border-radius: 4px;
  font-weight: 700;
  transition: transform 0.2s ease, background 0.2s ease;
}

.header-download,
.button.primary {
  color: var(--white);
  background: var(--primary);
}

.header-download:hover,
.button.primary:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
}

.button.secondary {
  border: 1px solid #9aa5a1;
  background: transparent;
}

.button.light {
  color: var(--ink);
  background: var(--white);
}

.menu-button {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--white);
  font-size: 22px;
}

.hero {
  border-bottom: 1px solid var(--line);
  background: linear-gradient(90deg, #f6f7f3 0 64%, #edf0eb 64%);
}

.hero-grid {
  min-height: 636px;
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(360px, 0.92fr);
  align-items: center;
  gap: 76px;
  padding-block: 46px;
}

.eyebrow,
.section-heading > span,
.download-inner span,
.faq-intro > span {
  display: block;
  color: var(--primary);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

.hero h1 {
  max-width: 680px;
  margin: 13px 0 18px;
  font-size: clamp(42px, 5vw, 68px);
  line-height: 1.09;
  letter-spacing: 0;
}

.hero-copy > p {
  max-width: 660px;
  margin: 0;
  color: #4b5955;
  font-size: 17px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.hero-facts {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin: 32px 0 0;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.hero-facts dt {
  color: #71807c;
  font-size: 12px;
}

.hero-facts dd {
  margin: 2px 0 0;
  font-weight: 700;
}

.hero-media {
  min-height: 530px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.hero-media::before {
  content: "";
  position: absolute;
  width: 330px;
  height: 430px;
  border: 1px solid #c2cbc7;
  background: var(--white);
  box-shadow: var(--shadow);
}

.hero-media img {
  position: relative;
  max-width: 237px;
  max-height: 498px;
  border: 1px solid #bcc6c2;
  box-shadow: 0 18px 34px rgba(22, 33, 31, 0.18);
}

.specimen-label {
  position: absolute;
  z-index: 2;
  top: 42px;
  right: 10px;
  padding: 7px 10px;
  color: #40504b;
  background: var(--paper);
  border: 1px solid var(--line);
  font-size: 12px;
  font-weight: 700;
}

.section {
  padding-block: 88px;
}

.section-heading {
  display: grid;
  grid-template-columns: 120px minmax(220px, 0.6fr) minmax(260px, 1fr);
  gap: 22px;
  align-items: end;
  margin-bottom: 34px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line);
}

.section-heading h2 {
  margin: 0;
  font-size: 34px;
  line-height: 1.2;
}

.section-note {
  color: var(--muted);
  font-size: 15px;
}

.gallery-section {
  background: var(--white);
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.gallery-card {
  margin: 0;
  border-top: 4px solid var(--teal);
  background: #f4f7f6;
}

.gallery-card img {
  width: 100%;
  max-width: 399px;
  margin: 28px auto 0;
  border: 1px solid #d2d9d6;
}

.gallery-card figcaption {
  display: grid;
  gap: 4px;
  padding: 22px 26px 26px;
}

.gallery-card figcaption span {
  color: var(--muted);
  font-size: 14px;
}

.feature-section {
  background: var(--paper);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--ink);
  border-left: 1px solid var(--line);
}

.feature-grid article {
  min-height: 240px;
  padding: 26px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.feature-grid b {
  color: var(--primary);
  font-size: 13px;
}

.feature-grid h3 {
  margin: 42px 0 10px;
  font-size: 20px;
}

.feature-grid p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.route-section {
  color: var(--white);
  background: #183f3b;
}

.route-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 80px;
}

.route-grid h2 {
  margin: 12px 0 16px;
  font-size: 38px;
}

.route-grid p,
.route-copy {
  color: #d5e0dc;
}

.text-link {
  display: inline-block;
  margin-top: 10px;
  color: var(--primary);
  font-weight: 800;
}

.route-grid .text-link {
  color: #ffd0c9;
}

.route-grid ol {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid rgba(255, 255, 255, 0.3);
}

.route-grid li {
  display: flex;
  gap: 22px;
  align-items: center;
  padding: 18px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.3);
  font-size: 18px;
}

.route-grid li span {
  color: #ffb2a8;
  font-size: 12px;
}

.faq-preview {
  background: var(--white);
}

.question-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.question-links a {
  display: grid;
  min-height: 150px;
  align-content: space-between;
  padding: 28px;
  background: var(--white);
}

.question-links a:hover {
  background: #f7f9f7;
}

.question-links span {
  color: var(--muted);
  font-size: 14px;
}

.download-band {
  padding-block: 48px;
  color: var(--white);
  background: var(--primary);
}

.download-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.download-inner span {
  color: #ffd9d4;
}

.download-inner h2 {
  margin: 5px 0 0;
  font-size: 30px;
}

.site-footer {
  padding-block: 30px;
  color: #61706c;
  background: #e9ece8;
  border-top: 1px solid var(--line);
  font-size: 13px;
  text-align: center;
}

.footer-inner p {
  margin: 5px auto;
}

.inner-hero {
  padding-block: 82px 70px;
  border-bottom: 1px solid var(--line);
  background: #edf0eb;
}

.narrow {
  max-width: 880px;
}

.inner-hero h1 {
  margin: 13px 0 18px;
  font-size: 48px;
  line-height: 1.18;
}

.inner-hero p {
  max-width: 760px;
  margin: 0;
  color: var(--muted);
  font-size: 17px;
}

.article-section,
.faq-section {
  padding-block: 72px 96px;
  background: var(--white);
}

.article-layout {
  display: grid;
  grid-template-columns: 220px minmax(0, 760px);
  justify-content: space-between;
  gap: 70px;
}

.article-nav {
  position: sticky;
  top: 104px;
  align-self: start;
  display: grid;
  gap: 10px;
  padding: 20px 0;
  border-top: 3px solid var(--primary);
  border-bottom: 1px solid var(--line);
}

.article-nav a {
  color: var(--muted);
  font-size: 14px;
}

.prose > section {
  padding-bottom: 46px;
  margin-bottom: 46px;
  border-bottom: 1px solid var(--line);
}

.step-no {
  color: var(--primary);
  font-size: 12px;
  font-weight: 800;
}

.prose h2,
.faq-intro h2 {
  margin: 6px 0 18px;
  font-size: 30px;
  line-height: 1.25;
}

.prose p {
  color: #475651;
}

.prose a:not(.button) {
  color: var(--primary);
  font-weight: 700;
}

.article-cta {
  padding: 34px;
  background: #edf3f0;
  border-left: 4px solid var(--teal);
}

.article-cta h2,
.article-cta p {
  margin-top: 0;
}

.faq-layout {
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr);
  gap: 70px;
}

.faq-intro {
  align-self: start;
  position: sticky;
  top: 108px;
}

.faq-intro p {
  color: var(--muted);
}

.accordion {
  border-top: 1px solid var(--ink);
}

.faq-item {
  border-bottom: 1px solid var(--line);
}

.faq-item button {
  width: 100%;
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr) 24px;
  gap: 12px;
  align-items: center;
  padding: 22px 0;
  color: var(--ink);
  background: transparent;
  border: 0;
  text-align: left;
  font-weight: 700;
  cursor: pointer;
}

.faq-item button span {
  color: var(--primary);
  font-size: 12px;
}

.faq-item button b {
  font-size: 22px;
  font-weight: 400;
  text-align: center;
}

.answer {
  display: none;
  padding: 0 36px 22px 52px;
  color: var(--muted);
}

.answer p {
  margin: 0;
}

.faq-item.open .answer {
  display: block;
}

.faq-item.open button b {
  transform: rotate(45deg);
}

@media (max-width: 900px) {
  .container {
    width: min(100% - 32px, 720px);
  }

  .header-inner {
    min-height: 64px;
    gap: 12px;
  }

  .brand img {
    width: 34px;
    height: 34px;
  }

  .menu-button {
    display: inline-grid;
    place-items: center;
  }

  .site-nav {
    display: none;
    position: absolute;
    top: 64px;
    left: 16px;
    right: 16px;
    padding: 10px 18px;
    background: var(--white);
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
  }

  .site-nav.open {
    display: grid;
  }

  .site-nav a {
    padding: 12px 0;
    border-bottom-width: 1px;
  }

  .header-download {
    display: none;
  }

  .hero {
    background: var(--paper);
  }

  .hero-grid {
    min-height: auto;
    grid-template-columns: 1fr;
    gap: 22px;
    padding-block: 28px 22px;
  }

  .hero h1 {
    margin-block: 9px 12px;
    font-size: 38px;
  }

  .hero-copy > p {
    font-size: 15px;
    line-height: 1.6;
  }

  .hero-actions {
    margin-top: 18px;
  }

  .hero-facts {
    margin-top: 18px;
    padding-top: 12px;
    gap: 8px;
  }

  .hero-facts dd {
    font-size: 13px;
  }

  .hero-media {
    min-height: 300px;
  }

  .hero-media::before {
    width: 220px;
    height: 275px;
  }

  .hero-media img {
    width: auto;
    max-height: 292px;
  }

  .specimen-label {
    top: 8px;
    right: 0;
  }

  .section {
    padding-block: 62px;
  }

  .section-heading {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .section-heading h2 {
    font-size: 30px;
  }

  .gallery-grid,
  .feature-grid,
  .route-grid,
  .question-links,
  .article-layout,
  .faq-layout {
    grid-template-columns: 1fr;
  }

  .feature-grid {
    border-top: 1px solid var(--line);
  }

  .feature-grid article {
    min-height: 180px;
  }

  .feature-grid h3 {
    margin-top: 22px;
  }

  .route-grid {
    gap: 40px;
  }

  .article-nav,
  .faq-intro {
    position: static;
  }

  .article-nav {
    grid-template-columns: repeat(2, 1fr);
  }

  .article-nav strong {
    grid-column: 1 / -1;
  }

  .inner-hero {
    padding-block: 52px;
  }

  .inner-hero h1 {
    font-size: 36px;
  }

  .faq-layout,
  .article-layout {
    gap: 44px;
  }
}

@media (max-width: 520px) {
  .container {
    width: calc(100% - 28px);
  }

  .hero h1 {
    font-size: 34px;
  }

  .hero-actions .button {
    flex: 1 1 145px;
    padding-inline: 12px;
  }

  .hero-facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .section-note {
    font-size: 14px;
  }

  .gallery-card img {
    width: calc(100% - 28px);
  }

  .download-inner {
    align-items: flex-start;
    flex-direction: column;
  }

  .download-inner h2 {
    font-size: 25px;
  }

  .inner-hero h1 {
    font-size: 32px;
  }

  .article-section,
  .faq-section {
    padding-block: 48px 72px;
  }

  .answer {
    padding-left: 0;
  }
}