html {
  scroll-behavior: auto;
}

:root {
  --s3-cream: #f4ead8;
  --s3-paper: #f8f1e4;
  --s3-sheet: #fffaf0;
  --s3-ink: #14241e;
  --s3-muted: #4a5c54;
  --s3-forest: #1a4536;
  --s3-deep: #0e2b22;
  --s3-leaf: #2a6b52;
  --s3-gold: #8a7344;
  --s3-rule: #d4c4a4;
  --s3-line: #c9b48a;
  --s3-chip: #e8dcc4;
  --s3-focus: #c4a35a;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  min-height: 100%;
  color: var(--s3-ink);
  background-color: var(--s3-cream);
  background-image:
    radial-gradient(rgba(20, 36, 30, 0.03) 0.7px, transparent 0.8px),
    linear-gradient(180deg, #efe4cc 0, var(--s3-cream) 90px, #f2e6d0 100%);
  background-size: 7px 7px, auto;
  font-family: "Palatino Linotype", Palatino, "Songti SC", "STSong", "SimSun", "Microsoft YaHei", serif;
  font-size: 17px;
  line-height: 1.82;
}

img {
  max-width: 100%;
  border: 0;
}

a {
  color: var(--s3-forest);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover {
  color: var(--s3-deep);
}

:focus-visible {
  outline: 2px solid var(--s3-focus);
  outline-offset: 3px;
}

.s3-frame {
  width: min(780px, calc(100% - 40px));
  margin: 0 auto;
}

.s3-header {
  border-bottom: 1px solid var(--s3-line);
  background: var(--s3-paper);
}

.s3-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 18px 0 16px;
}

.s3-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--s3-deep);
  text-decoration: none;
  letter-spacing: 0.04em;
}

.s3-brand:hover {
  color: var(--s3-forest);
}

.s3-brand svg {
  display: block;
  width: 28px;
  height: 28px;
}

.s3-brand-name {
  font-size: 18px;
  font-weight: 700;
}

.s3-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
}

.s3-nav a {
  color: var(--s3-muted);
  text-decoration: none;
  font-size: 15px;
  letter-spacing: 0.08em;
}

.s3-nav a:hover,
.s3-nav a.is-current {
  color: var(--s3-forest);
  box-shadow: inset 0 -2px 0 var(--s3-forest);
}

.s3-hero {
  padding: 42px 0 28px;
  border-bottom: 3px double var(--s3-line);
}

.s3-kicker {
  margin: 0 0 12px;
  color: var(--s3-gold);
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}

.s3-hero h1,
.s3-page-title {
  margin: 0 0 16px;
  color: var(--s3-deep);
  font-size: 32px;
  line-height: 1.35;
  font-weight: 700;
}

.s3-lede,
.s3-hero p {
  margin: 0 0 18px;
  color: var(--s3-ink);
}

.s3-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 0 0 20px;
}

.s3-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 48px;
  padding: 10px 22px;
  border: 1px solid var(--s3-forest);
  background: var(--s3-forest);
  color: #f8f1e4;
  text-decoration: none;
  letter-spacing: 0.04em;
}

.s3-btn svg {
  width: 18px;
  height: 18px;
  display: block;
}

.s3-btn:hover {
  background: var(--s3-deep);
  border-color: var(--s3-deep);
  color: #fffaf0;
}

.s3-btn-ghost {
  background: transparent;
  color: var(--s3-forest);
}

.s3-btn-ghost:hover {
  background: var(--s3-forest);
  color: #f8f1e4;
}

.s3-btn-win {
  box-shadow: 0 1px 0 rgba(14, 43, 34, 0.2);
}

.s3-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.s3-chips li {
  padding: 4px 10px;
  background: var(--s3-chip);
  color: var(--s3-deep);
  font-size: 13px;
  letter-spacing: 0.08em;
}

.s3-main {
  padding: 8px 0 56px;
}

.s3-section {
  padding: 34px 0 8px;
  border-top: 1px solid var(--s3-rule);
}

.s3-section:first-of-type {
  border-top: 0;
}

.s3-label {
  margin: 0 0 8px;
  color: var(--s3-gold);
  font-size: 12px;
  letter-spacing: 0.18em;
}

.s3-section h2 {
  margin: 0 0 16px;
  color: var(--s3-deep);
  font-size: 24px;
  line-height: 1.4;
}

.s3-section h3 {
  margin: 22px 0 10px;
  color: var(--s3-forest);
  font-size: 19px;
  line-height: 1.45;
}

.s3-section p {
  margin: 0 0 14px;
}

.s3-section ul,
.s3-section ol {
  margin: 0 0 16px;
  padding-left: 1.2em;
}

.s3-section li {
  margin: 0 0 8px;
}

.s3-scenes {
  display: grid;
  gap: 14px;
  margin: 18px 0 8px;
}

.s3-scene {
  padding: 16px 18px 8px;
  background: var(--s3-sheet);
  border: 1px solid var(--s3-rule);
  border-left: 4px solid var(--s3-forest);
}

.s3-scene h3 {
  margin-top: 0;
}

.s3-table-wrap {
  overflow-x: auto;
  margin: 12px 0 18px;
}

.s3-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--s3-sheet);
  font-size: 15px;
}

.s3-table th,
.s3-table td {
  padding: 10px 12px;
  border: 1px solid var(--s3-rule);
  text-align: left;
  vertical-align: top;
}

.s3-table th {
  background: #e7efe8;
  color: var(--s3-deep);
  font-weight: 700;
}

.s3-quotes {
  display: grid;
  gap: 14px;
  margin: 8px 0 16px;
}

.s3-quote {
  margin: 0;
  padding: 16px 18px 12px;
  background: var(--s3-sheet);
  border-top: 2px solid var(--s3-forest);
}

.s3-quote p {
  margin: 0 0 10px;
}

.s3-quote footer {
  color: var(--s3-gold);
  font-size: 14px;
  letter-spacing: 0.04em;
}

.s3-platforms {
  display: grid;
  gap: 12px;
  margin: 16px 0;
}

.s3-platform {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 16px;
  background: var(--s3-sheet);
  border: 1px solid var(--s3-rule);
}

.s3-platform p {
  margin: 0;
  flex: 1 1 220px;
}

.s3-steps {
  margin: 0 0 18px;
  padding: 0;
  list-style: none;
  counter-reset: s3step;
}

.s3-steps li {
  position: relative;
  margin: 0 0 12px;
  padding: 12px 14px 12px 56px;
  background: var(--s3-sheet);
  border: 1px solid var(--s3-rule);
  counter-increment: s3step;
}

.s3-steps li::before {
  content: counter(s3step);
  position: absolute;
  left: 14px;
  top: 12px;
  width: 28px;
  height: 28px;
  background: var(--s3-forest);
  color: #f8f1e4;
  text-align: center;
  line-height: 28px;
  font-size: 14px;
}

.s3-faq {
  margin: 8px 0 0;
}

.s3-faq-item {
  padding: 14px 0;
  border-top: 1px solid var(--s3-rule);
}

.s3-faq-item:first-child {
  border-top: 0;
}

.s3-faq dt {
  margin: 0 0 8px;
  color: var(--s3-deep);
  font-weight: 700;
}

.s3-faq dd {
  margin: 0;
}

.s3-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  margin: 18px 0 8px;
  padding: 18px;
  background: #e7efe8;
  border: 1px solid #b7cfc0;
}

.s3-cta p {
  margin: 0;
  flex: 1 1 240px;
}

.s3-note {
  padding: 12px 14px;
  background: #efe6d0;
  border: 1px solid var(--s3-rule);
  color: var(--s3-muted);
  font-size: 15px;
}

.s3-footer {
  border-top: 3px double var(--s3-line);
  background: var(--s3-paper);
  color: var(--s3-muted);
  font-size: 14px;
}

.s3-footer-inner {
  padding: 22px 0 28px;
}

.s3-footer p {
  margin: 0 0 8px;
}

@media (max-width: 900px) {
  body {
    font-size: 16px;
  }

  .s3-frame {
    width: min(780px, calc(100% - 32px));
  }

  .s3-hero h1,
  .s3-page-title {
    font-size: 28px;
  }

  .s3-section h2 {
    font-size: 22px;
  }
}

@media (max-width: 640px) {
  .s3-frame {
    width: calc(100% - 24px);
  }

  .s3-header-inner,
  .s3-platform,
  .s3-cta {
    flex-direction: column;
    align-items: stretch;
  }

  .s3-hero {
    padding-top: 28px;
  }

  .s3-hero h1,
  .s3-page-title {
    font-size: 24px;
  }

  .s3-btn {
    width: 100%;
  }

  .s3-nav {
    gap: 8px 14px;
  }
}