:root {
  color-scheme: light;
  --page: #fbf6ee;
  --page-deep: #f4eadc;
  --surface: #fffdf9;
  --surface-strong: #ffffff;
  --ink: #2b211c;
  --ink-soft: #655b54;
  --ink-muted: #847970;
  --accent: #c85d2b;
  --accent-deep: #9f421d;
  --accent-soft: #fff0e5;
  --accent-border: #eccab6;
  --line: #e8ddd2;
  --positive: #38654c;
  --warning: #8a5918;
  --warning-soft: #fff7e6;
  --danger: #a13d36;
  --shadow: 0 18px 52px rgba(70, 48, 34, 0.08);
  --radius-xl: 28px;
  --radius-lg: 20px;
  --radius-md: 14px;
  --content: 1120px;
  --article: 760px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  overflow-x: hidden;
  background:
    radial-gradient(circle at 92% 4%, rgba(232, 139, 82, 0.11), transparent 28rem),
    linear-gradient(180deg, var(--page) 0%, #fdfaf5 50%, var(--page) 100%);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  font-size: 16px;
  line-height: 1.78;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--accent-deep);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--accent);
}

a:focus-visible,
button:focus-visible,
summary:focus-visible {
  border-radius: 6px;
  outline: 3px solid rgba(200, 93, 43, 0.32);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  top: 10px;
  left: 12px;
  z-index: 100;
  padding: 9px 13px;
  border-radius: 10px;
  background: var(--ink);
  color: #fff;
  transform: translateY(-160%);
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid rgba(232, 221, 210, 0.88);
  background: rgba(251, 246, 238, 0.92);
  backdrop-filter: blur(18px) saturate(145%);
  -webkit-backdrop-filter: blur(18px) saturate(145%);
}

.header-inner {
  width: min(calc(100% - 32px), var(--content));
  min-height: 68px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  text-decoration: none;
}

.brand-mark {
  width: 35px;
  height: 35px;
  display: grid;
  place-items: center;
  border: 1px solid var(--accent-border);
  border-radius: 12px;
  background: var(--accent-soft);
  color: var(--accent-deep);
  font-size: 18px;
  font-weight: 800;
  line-height: 1;
}

.brand-copy {
  display: grid;
  line-height: 1.2;
}

.brand-copy strong {
  font-size: 15px;
  letter-spacing: 0.02em;
}

.brand-copy small {
  margin-top: 3px;
  color: var(--ink-muted);
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.nav-list,
.footer-links {
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 5px;
  list-style: none;
}

.nav-list a {
  display: block;
  padding: 7px 10px;
  border-radius: 10px;
  color: var(--ink-soft);
  font-size: 13px;
  font-weight: 600;
  text-decoration: none;
}

.nav-list a:hover,
.nav-list a[aria-current="page"] {
  background: var(--surface);
  color: var(--accent-deep);
  box-shadow: inset 0 0 0 1px var(--line);
}

main {
  width: min(calc(100% - 32px), var(--content));
  margin: 0 auto;
  padding: clamp(34px, 6vw, 72px) 0 72px;
}

.page-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(28px, 6vw, 58px);
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background: rgba(255, 253, 249, 0.92);
  box-shadow: var(--shadow);
}

.page-hero::after {
  content: "";
  position: absolute;
  right: -72px;
  bottom: -105px;
  width: 260px;
  height: 260px;
  border: 48px solid rgba(232, 139, 82, 0.09);
  border-radius: 50%;
  pointer-events: none;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--accent-deep);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  margin-top: 0;
  color: var(--ink);
  line-height: 1.34;
  text-wrap: balance;
}

h1 {
  max-width: 14em;
  margin-bottom: 14px;
  font-size: clamp(32px, 6vw, 52px);
  letter-spacing: -0.035em;
}

h2 {
  margin-bottom: 15px;
  font-size: clamp(20px, 3.2vw, 26px);
  letter-spacing: -0.018em;
}

h3 {
  margin-bottom: 8px;
  font-size: 17px;
}

.hero-summary {
  position: relative;
  z-index: 1;
  max-width: 720px;
  margin: 0;
  color: var(--ink-soft);
  font-size: clamp(15px, 2.2vw, 18px);
}

.meta-line {
  position: relative;
  z-index: 1;
  margin-top: 22px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  color: var(--ink-muted);
  font-size: 13px;
}

.meta-line span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.content-layout {
  margin-top: 26px;
  display: grid;
  grid-template-columns: minmax(0, var(--article)) minmax(220px, 1fr);
  align-items: start;
  gap: 24px;
}

.content-stack {
  min-width: 0;
  display: grid;
  gap: 14px;
}

.content-card,
.toc,
.support-intro,
.faq-group {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.88);
}

.content-card {
  padding: clamp(22px, 4vw, 32px);
}

.content-card[id] {
  scroll-margin-top: 92px;
}

.content-card p:first-of-type {
  margin-top: 0;
}

.content-card p:last-child,
.content-card ul:last-child,
.content-card ol:last-child,
.content-card dl:last-child {
  margin-bottom: 0;
}

p,
ul,
ol,
dl {
  margin-top: 0;
  margin-bottom: 14px;
}

ul,
ol {
  padding-left: 1.35em;
}

li + li {
  margin-top: 7px;
}

strong {
  color: var(--ink);
}

.toc {
  position: sticky;
  top: 92px;
  max-height: calc(100vh - 116px);
  overflow: auto;
  padding: 20px;
}

.toc strong {
  display: block;
  margin-bottom: 10px;
  font-size: 13px;
}

.toc ol {
  margin: 0;
  padding: 0;
  display: grid;
  gap: 3px;
  list-style: none;
  counter-reset: toc;
}

.toc li {
  margin: 0;
  counter-increment: toc;
}

.toc a {
  display: grid;
  grid-template-columns: 22px 1fr;
  gap: 3px;
  padding: 6px 5px;
  border-radius: 8px;
  color: var(--ink-soft);
  font-size: 12px;
  line-height: 1.45;
  text-decoration: none;
}

.toc a::before {
  content: counter(toc, decimal-leading-zero);
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}

.toc a:hover {
  background: var(--accent-soft);
  color: var(--ink);
}

.notice {
  margin: 16px 0;
  padding: 14px 16px;
  border: 1px solid var(--accent-border);
  border-radius: var(--radius-md);
  background: var(--accent-soft);
  color: #5d3524;
}

.notice.warning {
  border-color: #ead2a5;
  background: var(--warning-soft);
  color: #63451e;
}

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

.data-grid,
.processor-grid,
.choice-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.data-item,
.processor,
.choice-card {
  min-width: 0;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface);
}

.data-item dt,
.processor h3,
.choice-card h3 {
  margin: 0 0 6px;
  color: var(--ink);
  font-size: 14px;
  font-weight: 750;
}

.data-item dd,
.processor p,
.choice-card p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 13px;
}

.processor a {
  word-break: break-word;
}

.steps {
  padding-left: 0;
  list-style: none;
  counter-reset: steps;
}

.steps li {
  position: relative;
  min-height: 36px;
  padding-left: 46px;
  counter-increment: steps;
}

.steps li::before {
  content: counter(steps);
  position: absolute;
  top: 0;
  left: 0;
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  border-radius: 10px;
  background: var(--accent-soft);
  color: var(--accent-deep);
  font-size: 13px;
  font-weight: 800;
}

.steps li + li {
  margin-top: 15px;
}

.support-intro {
  margin-top: 24px;
  padding: 20px 22px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}

.support-intro p {
  margin: 0;
  color: var(--ink-soft);
}

.support-intro .version {
  flex: 0 0 auto;
  padding: 7px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--page);
  color: var(--ink-soft);
  font-size: 12px;
}

.faq-stack {
  margin-top: 14px;
  display: grid;
  gap: 14px;
}

.faq-group {
  padding: 20px;
}

.faq-group > h2 {
  margin-bottom: 14px;
}

.faq-card {
  border-top: 1px solid var(--line);
}

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

.faq-card summary {
  position: relative;
  padding: 16px 40px 16px 2px;
  cursor: pointer;
  color: var(--ink);
  font-weight: 680;
  list-style: none;
}

.faq-card summary::-webkit-details-marker {
  display: none;
}

.faq-card summary::after {
  content: "+";
  position: absolute;
  top: 15px;
  right: 7px;
  color: var(--accent-deep);
  font-size: 22px;
  font-weight: 400;
  line-height: 1;
}

.faq-card[open] summary::after {
  content: "−";
}

.faq-answer {
  padding: 0 38px 17px 2px;
  color: var(--ink-soft);
  font-size: 14px;
}

.faq-answer p:last-child,
.faq-answer ul:last-child,
.faq-answer ol:last-child {
  margin-bottom: 0;
}

.contact-card {
  padding: clamp(24px, 5vw, 38px);
  border: 1px solid var(--accent-border);
  border-radius: var(--radius-xl);
  background: var(--accent-soft);
}

.contact-card .contact-link {
  display: inline-block;
  margin: 4px 0 10px;
  font-size: clamp(18px, 4vw, 24px);
  font-weight: 750;
  word-break: break-word;
}

.site-footer {
  border-top: 1px solid var(--line);
  background: rgba(247, 239, 228, 0.75);
}

.footer-inner {
  width: min(calc(100% - 32px), var(--content));
  margin: 0 auto;
  padding: 30px 0 max(30px, env(safe-area-inset-bottom));
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 20px;
}

.footer-company {
  margin: 0;
  color: var(--ink-soft);
  font-size: 13px;
}

.footer-company strong {
  display: block;
  margin-bottom: 4px;
}

.footer-links {
  justify-content: flex-end;
  gap: 8px 15px;
}

.footer-links a {
  color: var(--ink-soft);
  font-size: 12px;
}

.back-top {
  margin-top: 18px;
  font-size: 12px;
}

@media (max-width: 860px) {
  .header-inner {
    padding: 10px 0;
    align-items: flex-start;
  }

  .nav-list {
    justify-content: flex-end;
  }

  .content-layout {
    grid-template-columns: 1fr;
  }

  .toc {
    position: static;
    max-height: none;
    grid-row: 1;
  }

  .toc ol {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 620px) {
  body {
    font-size: 15px;
  }

  .header-inner {
    width: min(calc(100% - 24px), var(--content));
    display: block;
  }

  .brand {
    margin-bottom: 7px;
  }

  .nav-list {
    justify-content: flex-start;
    gap: 2px;
  }

  .nav-list a {
    padding: 6px 8px;
    font-size: 12px;
  }

  main,
  .footer-inner {
    width: min(calc(100% - 24px), var(--content));
  }

  main {
    padding-top: 22px;
  }

  .page-hero {
    border-radius: 22px;
  }

  .content-card,
  .faq-group {
    padding: 19px;
  }

  .data-grid,
  .processor-grid,
  .choice-grid,
  .toc ol {
    grid-template-columns: 1fr;
  }

  .footer-inner {
    grid-template-columns: 1fr;
  }

  .footer-links {
    justify-content: flex-start;
  }
}

@media print {
  :root {
    --page: #fff;
    --surface: #fff;
    --line: #d7d7d7;
  }

  html {
    scroll-padding-top: 0;
  }

  body {
    background: #fff;
    color: #000;
    font-size: 11pt;
  }

  .site-header,
  .toc,
  .back-top,
  .skip-link {
    display: none !important;
  }

  main {
    width: 100%;
    padding: 0;
  }

  .page-hero,
  .content-card,
  .faq-group,
  .support-intro,
  .contact-card {
    border-color: #bbb;
    background: #fff;
    box-shadow: none;
    break-inside: avoid;
  }

  .content-layout {
    display: block;
  }

  .content-stack {
    margin-top: 16px;
  }

  .faq-card:not([open]) .faq-answer {
    display: block;
  }

  .site-footer {
    margin-top: 20px;
    background: #fff;
  }

  a {
    color: #000;
    text-decoration: underline;
  }
}