:root {
  color-scheme: light;
  --ink: #171614;
  --muted: #68645f;
  --line: #dedbd4;
  --paper: #fbfaf7;
  --paper-deep: #f2efe9;
  --warm: #e9cfaa;
  --dark: #121110;
  --blue: #0a7aff;
  --shell: 1120px;
  --page-pad: clamp(22px, 5vw, 64px);
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
}

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

html {
  background: var(--paper);
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.68;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

a {
  color: inherit;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 1000;
  padding: 10px 14px;
  border-radius: 10px;
  background: var(--dark);
  color: #fff;
  font-weight: 650;
  transform: translateY(-180%);
}

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

.guide-header {
  position: sticky;
  z-index: 100;
  top: 0;
  border-bottom: 1px solid rgba(23, 22, 20, 0.08);
  background: rgba(251, 250, 247, 0.92);
  -webkit-backdrop-filter: blur(22px) saturate(140%);
  backdrop-filter: blur(22px) saturate(140%);
}

.guide-nav,
.guide-shell,
.related-shell {
  width: min(100%, var(--shell));
  margin-inline: auto;
  padding-inline: var(--page-pad);
}

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

.guide-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 720;
  letter-spacing: -0.025em;
  text-decoration: none;
}

.guide-brand img {
  width: 36px;
  border-radius: 9px;
}

.guide-links {
  display: flex;
  align-items: center;
  gap: clamp(14px, 2.8vw, 32px);
  font-size: 0.86rem;
  font-weight: 600;
}

.guide-links a {
  color: var(--muted);
  text-decoration: none;
}

.guide-links a:hover,
.guide-links a:focus-visible {
  color: var(--ink);
}

.guide-download {
  padding: 8px 14px;
  border-radius: 999px;
  background: var(--ink);
  color: #fff !important;
}

.guide-hero {
  padding-block: clamp(88px, 13vw, 156px) clamp(76px, 10vw, 120px);
  border-bottom: 1px solid var(--line);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 30px;
  color: var(--muted);
  font-size: 0.8rem;
}

.breadcrumb a {
  text-underline-offset: 4px;
}

.guide-kicker {
  margin: 0 0 18px;
  color: #805b35;
  font-size: 0.78rem;
  font-weight: 720;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.guide-hero h1 {
  max-width: 900px;
  margin: 0 0 28px;
  font-size: clamp(3rem, 7.5vw, 6.9rem);
  font-weight: 740;
  letter-spacing: -0.055em;
  line-height: 0.98;
}

.guide-lede {
  max-width: 740px;
  margin: 0;
  color: #4e4a45;
  font-size: clamp(1.16rem, 2vw, 1.55rem);
  line-height: 1.52;
}

.guide-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin-top: 34px;
  color: var(--muted);
  font-size: 0.8rem;
}

.guide-layout {
  display: grid;
  grid-template-columns: minmax(180px, 0.34fr) minmax(0, 1fr);
  gap: clamp(42px, 8vw, 104px);
  padding-block: clamp(74px, 10vw, 130px);
}

.guide-toc {
  position: sticky;
  top: 112px;
  align-self: start;
}

.guide-toc strong {
  display: block;
  margin-bottom: 14px;
  font-size: 0.82rem;
}

.guide-toc a {
  display: block;
  padding-block: 7px;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.35;
  text-decoration: none;
}

.guide-toc a:hover,
.guide-toc a:focus-visible {
  color: var(--ink);
}

.guide-article {
  min-width: 0;
}

.answer-box {
  margin-bottom: 72px;
  padding: clamp(28px, 5vw, 48px);
  border-left: 4px solid #b78049;
  background: var(--paper-deep);
}

.answer-box strong {
  display: block;
  margin-bottom: 10px;
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.answer-box p {
  margin: 0;
  font-size: clamp(1.12rem, 1.8vw, 1.38rem);
  line-height: 1.55;
}

.guide-section {
  margin-bottom: clamp(70px, 9vw, 108px);
  scroll-margin-top: 110px;
}

.guide-section h2 {
  max-width: 760px;
  margin: 0 0 26px;
  font-size: clamp(2.15rem, 4.6vw, 4.35rem);
  font-weight: 730;
  letter-spacing: -0.045em;
  line-height: 1.04;
}

.guide-section h3 {
  margin: 42px 0 12px;
  font-size: clamp(1.35rem, 2.2vw, 1.8rem);
  letter-spacing: -0.025em;
  line-height: 1.2;
}

.guide-section p,
.guide-section li {
  max-width: 74ch;
}

.guide-section p {
  margin: 0 0 20px;
}

.guide-section ul,
.guide-section ol {
  margin: 24px 0;
  padding-left: 1.35em;
}

.guide-section li {
  margin-bottom: 10px;
}

.guide-section code,
.shortcut-table code {
  padding: 0.18em 0.4em;
  border: 1px solid #d8d4cc;
  border-radius: 7px;
  background: #fff;
  font-family: ui-monospace, "SFMono-Regular", Menlo, monospace;
  font-size: 0.88em;
}

.product-figure {
  margin: 46px 0;
}

.product-figure img {
  width: 100%;
  border: 1px solid rgba(15, 15, 15, 0.1);
  border-radius: clamp(18px, 2vw, 28px);
  box-shadow: 0 28px 70px rgba(45, 40, 33, 0.15);
}

.product-figure figcaption {
  margin-top: 14px;
  color: var(--muted);
  font-size: 0.78rem;
}

.comparison-table,
.shortcut-table {
  width: 100%;
  margin: 38px 0;
  border-collapse: collapse;
  font-size: 0.92rem;
}

.comparison-table th,
.comparison-table td,
.shortcut-table th,
.shortcut-table td {
  padding: 17px 14px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.comparison-table th,
.shortcut-table th {
  color: var(--muted);
  font-size: 0.76rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.fact-list {
  margin: 38px 0;
  border-top: 1px solid var(--line);
}

.fact-list div {
  display: grid;
  grid-template-columns: minmax(150px, 0.38fr) minmax(220px, 0.62fr);
  gap: 28px;
  padding-block: 20px;
  border-bottom: 1px solid var(--line);
}

.fact-list dt {
  font-weight: 700;
}

.fact-list dd {
  margin: 0;
  color: var(--muted);
}

.note {
  margin: 36px 0;
  padding: 24px 26px;
  border: 1px solid #e2d7ca;
  background: #fff8ef;
  color: #5f4d3b;
}

.faq-list {
  margin: 0;
}

.faq-list > div {
  padding-block: 34px;
  border-top: 1px solid var(--line);
}

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

.faq-list dt {
  margin-bottom: 12px;
  font-size: clamp(1.25rem, 2vw, 1.65rem);
  font-weight: 710;
  letter-spacing: -0.025em;
}

.faq-list dd {
  max-width: 72ch;
  margin: 0;
  color: #4e4a45;
}

.guide-cta {
  padding: clamp(42px, 7vw, 72px);
  background: var(--dark);
  color: #fff;
}

.guide-cta h2 {
  margin-bottom: 18px;
  color: #fff;
}

.guide-cta p {
  color: rgba(255, 255, 255, 0.68);
}

.guide-cta a {
  display: inline-flex;
  min-height: 50px;
  align-items: center;
  margin-top: 14px;
  padding: 12px 20px;
  border-radius: 999px;
  background: #fff;
  color: var(--ink);
  font-weight: 700;
  text-decoration: none;
}

.related {
  padding-block: clamp(80px, 10vw, 128px);
  background: #fff;
}

.related h2 {
  margin: 0 0 34px;
  font-size: clamp(2rem, 4vw, 3.8rem);
  letter-spacing: -0.04em;
  line-height: 1.05;
}

.related-links {
  border-top: 1px solid var(--line);
}

.related-links a {
  display: grid;
  grid-template-columns: minmax(180px, 0.46fr) minmax(240px, 0.54fr);
  gap: 28px;
  padding: 26px 0;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
}

.related-links strong {
  font-size: 1.08rem;
}

.related-links span {
  color: var(--muted);
}

.guide-footer {
  padding-block: 46px;
  background: #0d0c0b;
  color: rgba(255, 255, 255, 0.64);
}

.guide-footer .guide-shell {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 18px 30px;
}

.guide-footer a {
  text-underline-offset: 4px;
}

:focus-visible {
  outline: 3px solid var(--blue);
  outline-offset: 4px;
}

@media (max-width: 820px) {
  .guide-layout {
    grid-template-columns: 1fr;
  }

  .guide-toc {
    position: static;
    padding-bottom: 28px;
    border-bottom: 1px solid var(--line);
  }

  .fact-list div,
  .related-links a {
    grid-template-columns: 1fr;
    gap: 8px;
  }
}

@media (max-width: 640px) {
  body {
    font-size: 16px;
  }

  .guide-nav {
    min-height: 64px;
  }

  .guide-links > a:first-child {
    display: none;
  }

  .guide-hero {
    padding-top: 72px;
  }

  .guide-hero h1 {
    font-size: clamp(2.85rem, 14vw, 4.8rem);
  }

  .comparison-table,
  .shortcut-table {
    display: block;
    overflow-x: auto;
    white-space: nowrap;
  }
}

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