:root {
  --green: #0d8b7f;
  --green-dark: #075f58;
  --blue: #2764d8;
  --ink: #14212f;
  --text: #405166;
  --muted: #718096;
  --line: #d7e0e8;
  --paper: #ffffff;
  --soft: #f3f8f7;
  --blue-soft: #eef4ff;
  --shadow: 0 16px 42px rgba(20, 33, 47, 0.1);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  background: var(--paper);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
  line-height: 1.72;
}

a {
  color: var(--green-dark);
}

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

.skip-link {
  position: fixed;
  left: 16px;
  top: -90px;
  z-index: 30;
  padding: 10px 14px;
  color: #fff;
  background: var(--green-dark);
  border-radius: 6px;
}

.skip-link:focus {
  top: 14px;
}

.shell {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}

.header-row {
  min-height: 74px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand img {
  display: block;
  width: auto;
  max-height: 42px;
}

.nav {
  display: flex;
  gap: 22px;
}

.nav a {
  color: var(--text);
  text-decoration: none;
  font-size: 15px;
}

.nav a:hover {
  color: var(--green-dark);
}

.download-btn,
.primary-link,
.ghost-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 22px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 800;
}

.download-btn,
.primary-link {
  color: #fff;
  background: var(--green);
  border: 1px solid var(--green);
  box-shadow: 0 10px 22px rgba(13, 139, 127, 0.2);
}

.download-btn:hover,
.primary-link:hover {
  color: #fff;
  background: var(--green-dark);
}

.ghost-link {
  color: var(--green-dark);
  background: #fff;
  border: 1px solid var(--line);
}

.ghost-link:hover {
  border-color: var(--green);
  background: var(--soft);
}

.hero {
  padding: 76px 0;
  background:
    linear-gradient(90deg, #f7fbfb 0%, #ffffff 48%, #eef4ff 100%);
}

.hero-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 410px;
  gap: 54px;
  align-items: center;
}

.kicker {
  margin: 0 0 10px;
  color: var(--green-dark);
  font-size: 14px;
  font-weight: 900;
}

h1,
h2,
h3 {
  margin-top: 0;
  color: var(--ink);
  line-height: 1.24;
}

h1 {
  max-width: 760px;
  margin-bottom: 20px;
  font-size: clamp(38px, 5.2vw, 62px);
}

h2 {
  margin-bottom: 14px;
  font-size: clamp(28px, 3.4vw, 42px);
}

h3 {
  margin-bottom: 10px;
  font-size: 21px;
}

p {
  margin: 0 0 1em;
}

.summary {
  max-width: 700px;
  color: var(--muted);
  font-size: 20px;
}

.action-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.hero-card {
  padding: 24px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.hero-card img {
  display: block;
  width: 100%;
  max-height: 420px;
  object-fit: contain;
}

.quick-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 18px;
}

.quick-list span {
  padding: 10px 12px;
  color: var(--ink);
  background: var(--soft);
  border: 1px solid var(--line);
  border-radius: 6px;
  text-align: center;
  font-size: 14px;
  font-weight: 700;
}

.notice-strip {
  padding: 18px 0;
  color: #6b4a05;
  background: #fff7e6;
  border-top: 1px solid #f2dfb7;
  border-bottom: 1px solid #f2dfb7;
}

.section {
  padding: 86px 0;
}

.tinted {
  background: var(--soft);
}

.two-column {
  display: grid;
  grid-template-columns: 0.78fr 1.22fr;
  gap: 58px;
  align-items: start;
}

.text-stack {
  padding: 28px;
  background: var(--paper);
  border-left: 4px solid var(--green);
  box-shadow: 0 10px 30px rgba(20, 33, 47, 0.06);
}

.text-stack p:last-child {
  margin-bottom: 0;
}

.section-title {
  max-width: 740px;
  margin-bottom: 42px;
}

.timeline {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.timeline article {
  position: relative;
  min-height: 245px;
  padding: 26px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.timeline span {
  display: inline-grid;
  width: 40px;
  height: 40px;
  margin-bottom: 26px;
  color: #fff;
  background: var(--blue);
  border-radius: 50%;
  place-items: center;
  font-weight: 900;
}

.card-matrix {
  display: grid;
  grid-template-columns: 1.5fr 0.75fr;
  gap: 18px;
}

.large-card,
.small-card,
.compare-grid article,
.faq-grid details {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 12px 34px rgba(20, 33, 47, 0.07);
}

.large-card {
  grid-row: span 2;
  display: grid;
  grid-template-columns: 0.92fr 1.08fr;
  gap: 28px;
  align-items: center;
  padding: 30px;
}

.large-card img {
  max-height: 360px;
  object-fit: contain;
}

.small-card {
  padding: 28px;
}

.safety-layout {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 46px;
  align-items: center;
}

.safety-copy p:last-child {
  color: var(--muted);
}

.check-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.check-grid div {
  position: relative;
  min-height: 72px;
  padding: 16px 16px 16px 42px;
  color: var(--ink);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  font-weight: 700;
}

.check-grid div::before {
  content: "!";
  position: absolute;
  left: 16px;
  top: 18px;
  width: 18px;
  height: 18px;
  display: grid;
  place-items: center;
  color: #fff;
  background: #c7681d;
  border-radius: 50%;
  font-size: 12px;
}

.compare-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.compare-grid article {
  padding: 26px;
}

.compare-grid img {
  display: block;
  width: 100%;
  height: 185px;
  margin-bottom: 18px;
  object-fit: contain;
}

.faq-section {
  background: linear-gradient(180deg, var(--blue-soft), #fff);
}

.faq-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.faq-grid details {
  padding: 0;
}

.faq-grid summary {
  padding: 20px 22px;
  color: var(--ink);
  cursor: pointer;
  list-style: none;
  font-weight: 800;
}

.faq-grid summary::after {
  content: "+";
  float: right;
  color: var(--green);
  font-size: 22px;
}

.faq-grid details[open] summary::after {
  content: "-";
}

.faq-grid p {
  margin: 0;
  padding: 0 22px 22px;
  color: var(--muted);
}

.download-panel {
  padding: 58px 0;
  color: #fff;
  background: var(--green-dark);
}

.download-layout {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}

.download-panel h2,
.download-panel .kicker {
  color: #fff;
}

.download-panel .ghost-link {
  color: #fff;
  background: transparent;
  border-color: rgba(255, 255, 255, 0.58);
}

.site-footer {
  color: rgba(255, 255, 255, 0.86);
  background: #111827;
}

.footer-row {
  min-height: 170px;
  padding: 34px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
}

.footer-row img {
  display: block;
  width: auto;
  max-height: 40px;
  margin-bottom: 14px;
  filter: brightness(0) invert(1);
}

.footer-row p {
  max-width: 620px;
  margin: 0;
}

.footer-note {
  white-space: nowrap;
  color: rgba(255, 255, 255, 0.68);
  font-size: 14px;
}

@media (max-width: 1060px) {
  .nav {
    display: none;
  }

  .hero-layout,
  .two-column,
  .safety-layout {
    grid-template-columns: 1fr;
  }

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

  .card-matrix {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  .shell {
    width: min(100% - 32px, 1120px);
  }

  .header-row {
    min-height: 64px;
  }

  .brand img {
    max-width: 128px;
  }

  .download-btn {
    min-height: 40px;
    padding: 0 12px;
    font-size: 14px;
  }

  .hero,
  .section {
    padding: 58px 0;
  }

  h1 {
    font-size: 34px;
  }

  .summary {
    font-size: 18px;
  }

  .action-row,
  .download-layout,
  .footer-row {
    align-items: stretch;
    flex-direction: column;
  }

  .action-row a {
    width: 100%;
  }

  .timeline,
  .large-card,
  .check-grid,
  .compare-grid,
  .faq-grid {
    grid-template-columns: 1fr;
  }

  .timeline article {
    min-height: 0;
  }

  .footer-note {
    white-space: normal;
  }
}

@media (max-width: 420px) {
  h1 {
    font-size: 31px;
  }

  .quick-list {
    grid-template-columns: 1fr;
  }
}