:root {
  --paper: #f6f1e7;
  --paper-raised: #fffdf8;
  --paper-sunken: #efe8da;
  --ink: #1f1b16;
  --ink-2: #3a342b;
  --ink-3: #544c40;
  --ink-4: #6c6355;
  --line: #e3dccd;
  --line-strong: #d3c8b3;
  --zhu: #b5402e;
  --zhu-deep: #8a3b2c;
  --gold: #c9a86a;
  --link: #2b4c7e;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 100;
  padding: 8px 12px;
  background: var(--ink);
  color: var(--paper-raised);
  transform: translateY(-160%);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  border-bottom: 1px solid var(--line);
  background: rgba(246, 241, 231, 0.96);
}

.header-inner,
.hero-inner,
.section-inner,
.closing-inner,
.footer-inner {
  width: min(1120px, calc(100% - 48px));
  margin: 0 auto;
}

.header-inner {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.brand-seal {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 48px;
  height: 30px;
  padding: 0 8px;
  border-radius: 4px;
  background: var(--zhu);
  color: var(--paper-raised);
  font-family: "Noto Serif SC", "Songti SC", serif;
  font-size: 15px;
  font-weight: 700;
}

.brand-name,
.header-link {
  font-size: 13px;
  color: var(--ink-3);
}

.header-link {
  text-decoration: none;
}

.header-link:hover,
.header-link:focus-visible,
.text-action:hover,
.text-action:focus-visible {
  color: var(--link);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.hero {
  overflow: hidden;
}

.hero-inner {
  padding-top: 72px;
  padding-bottom: 72px;
}

.eyebrow,
.section-number,
.step-number {
  margin: 0;
  color: var(--zhu);
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-size: 12px;
  letter-spacing: 0;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1,
h2,
h3 {
  font-family: "Noto Serif SC", "Songti SC", serif;
  letter-spacing: 0;
}

h1 {
  margin-bottom: 8px;
  font-size: 68px;
  line-height: 1.12;
  font-weight: 600;
}

.hero-lead {
  margin-bottom: 14px;
  font-family: "Noto Serif SC", "Songti SC", serif;
  font-size: 25px;
  color: var(--ink-2);
}

.hero-copy {
  max-width: 700px;
  margin-bottom: 28px;
  font-size: 16px;
  color: var(--ink-3);
}

.primary-action {
  display: inline-flex;
  align-items: center;
  gap: 18px;
  min-height: 48px;
  padding: 0 8px 0 18px;
  border: 1px solid var(--zhu);
  border-radius: 6px;
  background: var(--zhu);
  color: var(--paper-raised);
  text-decoration: none;
  font-size: 14px;
  transition: background-color 160ms ease, border-color 160ms ease, transform 160ms ease;
}

.primary-action:hover,
.primary-action:focus-visible {
  background: var(--zhu-deep);
  border-color: var(--zhu-deep);
  transform: translateY(-1px);
}

.action-icon {
  width: 34px;
  height: 34px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-left: 1px solid rgba(255, 253, 248, 0.35);
}

.product-view {
  position: relative;
  margin: 54px 0 0;
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
  background: var(--paper-raised);
}

.product-view::before {
  content: "真实产品界面";
  position: absolute;
  top: 14px;
  left: 16px;
  z-index: 1;
  padding: 3px 7px;
  border-radius: 3px;
  background: var(--ink);
  color: var(--paper-raised);
  font-size: 11px;
}

.product-view img {
  display: block;
  width: 100%;
  height: 310px;
  object-fit: cover;
  object-position: center top;
}

.product-view figcaption {
  margin: 0;
  padding: 12px 16px;
  border-top: 1px solid var(--line);
  color: var(--ink-4);
  font-size: 12px;
}

.reading-flow {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--paper-raised);
}

.section-inner {
  padding-top: 84px;
  padding-bottom: 88px;
}

.section-intro {
  display: grid;
  grid-template-columns: 84px minmax(0, 620px);
  gap: 20px;
  align-items: start;
}

.section-number {
  padding-top: 7px;
  color: var(--gold);
}

.section-intro h2,
.closing h2 {
  margin-bottom: 12px;
  font-size: 32px;
  line-height: 1.35;
  font-weight: 600;
}

.section-intro p {
  margin-bottom: 0;
  color: var(--ink-3);
  font-size: 15px;
}

.flow-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0;
  margin: 56px 0 0 104px;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-strong);
}

.flow-list li {
  min-height: 210px;
  padding: 24px 28px 28px;
  border-right: 1px solid var(--line);
}

.flow-list li:first-child {
  border-left: 1px solid var(--line);
}

.flow-list h3 {
  margin: 30px 0 8px;
  font-size: 19px;
}

.flow-list p {
  margin-bottom: 0;
  color: var(--ink-3);
  font-size: 14px;
}

.closing-inner {
  display: grid;
  grid-template-columns: 240px minmax(0, 660px);
  gap: 48px;
  align-items: end;
  padding-top: 96px;
  padding-bottom: 100px;
}

.closing-mark {
  margin-bottom: 0;
  color: var(--zhu);
  font-family: "Noto Serif SC", "Songti SC", serif;
  font-size: 58px;
  font-weight: 700;
}

.text-action {
  display: inline-block;
  margin-top: 16px;
  color: var(--link);
  font-size: 14px;
  text-decoration: none;
}

.site-footer {
  border-top: 1px solid var(--line-strong);
  background: var(--ink);
  color: var(--paper-sunken);
}

.footer-inner {
  min-height: 132px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}

.company {
  margin-bottom: 0;
  font-family: "Noto Serif SC", "Songti SC", serif;
  font-size: 14px;
}

.filings {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 10px 20px;
}

.filings a {
  color: var(--paper-sunken);
  font-size: 12px;
  text-decoration: none;
}

.filings a:hover,
.filings a:focus-visible {
  text-decoration: underline;
  text-underline-offset: 4px;
}

.police-filing {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

.police-filing img {
  display: block;
  flex: 0 0 auto;
}

@media (max-width: 760px) {
  .header-inner,
  .hero-inner,
  .section-inner,
  .closing-inner,
  .footer-inner {
    width: min(100% - 32px, 1120px);
  }

  .brand-name {
    display: none;
  }

  .hero-inner {
    padding-top: 48px;
    padding-bottom: 48px;
  }

  h1 {
    font-size: 48px;
  }

  .hero-lead {
    font-size: 21px;
  }

  .hero-copy {
    font-size: 15px;
  }

  .product-view {
    margin-top: 40px;
  }

  .product-view img {
    height: 230px;
    object-position: 37% top;
  }

  .section-inner {
    padding-top: 60px;
    padding-bottom: 64px;
  }

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

  .section-intro h2,
  .closing h2 {
    font-size: 27px;
  }

  .flow-list {
    grid-template-columns: 1fr;
    margin: 40px 0 0;
    border-bottom: 1px solid var(--line-strong);
  }

  .flow-list li {
    min-height: 0;
    padding: 22px 4px 24px;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .flow-list li:first-child {
    border-left: 0;
  }

  .flow-list li:last-child {
    border-bottom: 0;
  }

  .flow-list h3 {
    margin-top: 12px;
  }

  .closing-inner {
    grid-template-columns: 1fr;
    gap: 24px;
    padding-top: 68px;
    padding-bottom: 72px;
  }

  .closing-mark {
    font-size: 42px;
  }

  .footer-inner {
    min-height: 0;
    padding-top: 34px;
    padding-bottom: 36px;
    align-items: flex-start;
    flex-direction: column;
    gap: 18px;
  }

  .filings {
    justify-content: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 360px) {
  .header-link {
    font-size: 12px;
  }

  h1 {
    font-size: 43px;
  }

  .primary-action {
    width: 100%;
    justify-content: space-between;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .primary-action {
    transition: none;
  }
}