:root {
  color-scheme: light;
  --paper: #f7f4ed;
  --paper-2: #fffdf8;
  --paper-3: #efeae0;
  --ink: #1f1d1a;
  --ink-2: #57524a;
  --ink-3: #6a655b;
  --line: rgba(31, 29, 26, 0.12);
  --line-2: rgba(31, 29, 26, 0.2);
  --cinnabar: #a8372c;
  --cinnabar-soft: #f3e3df;
  --celadon: #4a6d5f;
  --celadon-soft: #e2efe8;
  --gold: #836221;
  --gold-soft: #f5ead4;
  --serif: Georgia, 'Times New Roman', 'Songti SC', 'Noto Serif CJK SC', serif;
  --sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --radius: 16px;
  --shadow: 0 10px 40px rgba(31, 29, 26, 0.07);
  --measure: 44rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --paper: #171512;
    --paper-2: #201d19;
    --paper-3: #2b2721;
    --ink: #ece7dd;
    --ink-2: #c2bbb0;
    --ink-3: #a39b8e;
    --line: rgba(236, 231, 221, 0.14);
    --line-2: rgba(236, 231, 221, 0.26);
    --cinnabar: #e08a7a;
    --cinnabar-soft: #3a2621;
    --celadon: #8db8a2;
    --celadon-soft: #24312b;
    --gold: #c9a55a;
    --gold-soft: #332b1d;
    --shadow: 0 10px 40px rgba(0, 0, 0, 0.42);
  }
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5.5rem;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 12% 0%, rgba(168, 128, 47, 0.08), transparent 32rem),
    radial-gradient(circle at 88% 12%, rgba(74, 109, 95, 0.07), transparent 30rem),
    var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.72;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }
img { max-width: 100%; height: auto; }
h1, h2, h3, h4 {
  margin: 0;
  font-family: var(--serif);
  font-weight: 500;
  line-height: 1.18;
  letter-spacing: -0.015em;
}
p { margin: 0 0 1.1em; }
ul, ol { margin: 0 0 1.2em; padding-left: 1.25em; }
li { margin: 0.35em 0; }
strong { font-weight: 650; }
code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.92em;
  background: var(--paper-3);
  border-radius: 4px;
  padding: 0.08em 0.34em;
}

.skip {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--ink);
  color: var(--paper);
  padding: 0.7rem 1rem;
  z-index: 100;
}
.skip:focus { left: 1rem; top: 1rem; }

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(14px);
  background: color-mix(in srgb, var(--paper) 86%, transparent);
  border-bottom: 1px solid var(--line);
}
.topbar-inner {
  max-width: 72rem;
  margin: 0 auto;
  padding: 0.7rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.brand {
  display: flex;
  align-items: baseline;
  gap: 0.55rem;
  text-decoration: none;
}
.brand-cn { font-family: var(--serif); font-size: 1.45rem; letter-spacing: 0.06em; }
.brand-en {
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  color: var(--ink-3);
  text-transform: uppercase;
}
.topnav {
  display: flex;
  align-items: center;
  gap: 1.1rem;
  font-size: 0.86rem;
  color: var(--ink-2);
}
.topnav a { text-decoration: none; border-bottom: 1px solid transparent; }
.topnav a:hover { border-color: var(--gold); color: var(--ink); }
.topnav .top-cta {
  border: 1px solid var(--line-2);
  border-radius: 999px;
  padding: 0.42rem 0.95rem;
  background: var(--paper-2);
  color: var(--ink);
}
.topnav .top-cta:hover { border-color: var(--cinnabar); background: var(--cinnabar-soft); }

.wrap {
  max-width: 72rem;
  margin: 0 auto;
  padding: 0 1.25rem;
}
.article-layout {
  display: grid;
  grid-template-columns: minmax(0, var(--measure)) 1fr;
  gap: 3.5rem;
  align-items: start;
  padding: 2.4rem 0 4rem;
}
.article-main { min-width: 0; }
.toc {
  position: sticky;
  top: 5.4rem;
  border-left: 1px solid var(--line);
  padding-left: 1.4rem;
  font-size: 0.84rem;
  line-height: 1.5;
}
.toc-title {
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: 0.65rem;
}
.toc ol { list-style: none; margin: 0; padding: 0; }
.toc li { margin: 0.5rem 0; }
.toc a { text-decoration: none; color: var(--ink-2); }
.toc a:hover { color: var(--cinnabar); }

.crumbs {
  font-size: 0.8rem;
  color: var(--ink-3);
  margin: 0 0 1.6rem;
}
.crumbs a { text-decoration: none; }
.crumbs a:hover { text-decoration: underline; }
.crumbs span { margin: 0 0.45rem; }

.hero { padding: 1.2rem 0 2rem; }
.kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cinnabar);
  margin-bottom: 1rem;
}
.kicker::before {
  content: '';
  width: 1.9rem;
  height: 1px;
  background: currentColor;
}
h1 {
  font-size: clamp(2.25rem, 5.6vw, 3.9rem);
  margin-bottom: 1.1rem;
}
.lede {
  font-size: clamp(1.08rem, 2.2vw, 1.28rem);
  line-height: 1.6;
  color: var(--ink-2);
  max-width: 36rem;
  margin-bottom: 1.3rem;
}
.meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.1rem;
  font-size: 0.8rem;
  color: var(--ink-3);
}
.meta span + span::before { content: '·'; margin-right: 0.7rem; }

.glance {
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.4rem 1.5rem;
  margin: 1.8rem 0 2.6rem;
}
.glance h2 {
  font-size: 0.74rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 0.7rem;
  font-family: var(--sans);
}
.glance ul { margin: 0; padding-left: 1.15rem; }
.glance li { margin: 0.45rem 0; }

section { margin: 3rem 0; }
h2 {
  font-size: clamp(1.55rem, 3.4vw, 2.1rem);
  margin-bottom: 1rem;
}
h3 { font-size: 1.2rem; margin: 1.8rem 0 0.55rem; }
h2 + p, h3 + p { color: var(--ink-2); }

.callout {
  border-left: 3px solid var(--gold);
  background: var(--gold-soft);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 1.05rem 1.2rem;
  margin: 1.6rem 0;
  font-size: 0.95rem;
}
.callout p:last-child { margin-bottom: 0; }
.callout strong { color: var(--ink); }
.callout.safety { border-color: var(--cinnabar); background: var(--cinnabar-soft); }
.callout.calm { border-color: var(--celadon); background: var(--celadon-soft); }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(13rem, 1fr));
  gap: 1rem;
  margin: 1.4rem 0 1.8rem;
}
.card {
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.15rem 1.2rem;
}
.card h3 { margin: 0 0 0.4rem; font-size: 1.08rem; }
.card p { margin: 0; font-size: 0.9rem; color: var(--ink-2); }
.card .tagline {
  display: block;
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 0.35rem;
}

.table-scroll {
  overflow-x: auto;
  margin: 1.3rem 0 1.8rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper-2);
}
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  min-width: 34rem;
}
th, td {
  text-align: left;
  vertical-align: top;
  padding: 0.75rem 0.95rem;
  border-bottom: 1px solid var(--line);
}
th {
  font-family: var(--sans);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-3);
  background: var(--paper-3);
  font-weight: 600;
}
tr:last-child td { border-bottom: none; }
td strong { color: var(--ink); }

.steps {
  counter-reset: step;
  list-style: none;
  padding: 0;
  margin: 1.2rem 0 1.8rem;
}
.steps li {
  counter-increment: step;
  position: relative;
  padding-left: 2.7rem;
  margin: 0.9rem 0;
}
.steps li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 0.08rem;
  width: 1.75rem;
  height: 1.75rem;
  border: 1px solid var(--line-2);
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: 0.76rem;
  color: var(--gold);
  background: var(--paper-2);
}

.point {
  display: grid;
  grid-template-columns: 5.2rem 1fr;
  gap: 1.1rem;
  padding: 1.2rem 0;
  border-top: 1px solid var(--line);
}
.point:last-child { border-bottom: 1px solid var(--line); }
.point-code {
  font-family: var(--serif);
  font-size: 1.55rem;
  color: var(--cinnabar);
  line-height: 1.1;
}
.point-code small {
  display: block;
  font-family: var(--sans);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: var(--ink-3);
  margin-top: 0.3rem;
  text-transform: uppercase;
}
.point h3 { margin: 0 0 0.3rem; }
.point p { margin: 0 0 0.45rem; font-size: 0.95rem; color: var(--ink-2); }
.point .dose { font-size: 0.84rem; color: var(--ink-3); }

.cta {
  margin: 3.2rem 0 2rem;
  padding: 2rem 1.8rem;
  border: 1px solid var(--line-2);
  border-radius: calc(var(--radius) + 4px);
  background:
    linear-gradient(135deg, color-mix(in srgb, var(--gold-soft) 70%, transparent), transparent 60%),
    var(--paper-2);
  box-shadow: var(--shadow);
}
.cta h2 { margin-bottom: 0.5rem; }
.cta p { color: var(--ink-2); max-width: 34rem; }
.button {
  display: inline-block;
  margin-top: 0.7rem;
  padding: 0.82rem 1.35rem;
  border-radius: 999px;
  background: var(--ink);
  color: var(--paper);
  text-decoration: none;
  font-size: 0.95rem;
  letter-spacing: 0.01em;
  transition: transform 160ms ease, background 160ms ease;
}
.button:hover { transform: translateY(-1px); background: var(--cinnabar); }
.button.secondary {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--line-2);
  margin-left: 0.5rem;
}
.button.secondary:hover { border-color: var(--cinnabar); background: var(--cinnabar-soft); }
.micro { font-size: 0.78rem; color: var(--ink-3); margin-top: 0.7rem; }

.faq details {
  border-top: 1px solid var(--line);
  padding: 0.95rem 0;
}
.faq details:last-child { border-bottom: 1px solid var(--line); }
.faq summary {
  cursor: pointer;
  font-family: var(--serif);
  font-size: 1.06rem;
  list-style: none;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: '+'; color: var(--gold); font-family: var(--sans); }
.faq details[open] summary::after { content: '−'; }
.faq details p { margin: 0.65rem 0 0; color: var(--ink-2); font-size: 0.95rem; }

.note {
  font-size: 0.82rem;
  color: var(--ink-3);
  border-top: 1px solid var(--line);
  padding-top: 1rem;
  margin-top: 2.5rem;
}

.site-footer {
  border-top: 1px solid var(--line);
  margin-top: 3rem;
  padding: 2rem 0 3rem;
  font-size: 0.84rem;
  color: var(--ink-3);
}
.footer-inner {
  max-width: 72rem;
  margin: 0 auto;
  padding: 0 1.25rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1.2rem;
}
.footer-links { display: flex; flex-wrap: wrap; gap: 1rem; }
.footer-links a { text-decoration: none; }
.footer-links a:hover { color: var(--cinnabar); }
.footer-disclaimer { max-width: 42rem; margin-top: 1.2rem; line-height: 1.6; }

/* ---- index page ---- */
.index-hero { padding: 4rem 0 2rem; max-width: 46rem; }
.guide-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(17rem, 1fr));
  gap: 1.2rem;
  margin: 2rem 0 3rem;
}
.guide-card {
  display: flex;
  flex-direction: column;
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.5rem 1.45rem;
  text-decoration: none;
  box-shadow: var(--shadow);
  transition: transform 180ms ease, border-color 180ms ease;
}
.guide-card:hover { transform: translateY(-3px); border-color: var(--gold); }
.guide-card .num {
  font-family: var(--serif);
  color: var(--gold);
  font-size: 0.9rem;
  letter-spacing: 0.1em;
  margin-bottom: 1.4rem;
}
.guide-card h2 { font-size: 1.42rem; margin-bottom: 0.55rem; }
.guide-card p { color: var(--ink-2); font-size: 0.92rem; flex: 1; }
.guide-card .read {
  font-size: 0.78rem;
  color: var(--ink-3);
  margin-top: 1rem;
  letter-spacing: 0.04em;
}
.guide-card .read::after { content: ' →'; color: var(--cinnabar); }

@media (max-width: 60rem) {
  .article-layout { grid-template-columns: 1fr; gap: 0; }
  .toc { display: none; }
}

@media (max-width: 40rem) {
  body { font-size: 16px; }
  .topnav a:not(.top-cta) { display: none; }
  .topbar-inner { padding: 0.6rem 1rem; }
  .wrap { padding: 0 1rem; }
  .article-layout { padding-top: 1.4rem; }
  .glance { padding: 1.15rem 1.1rem; }
  .point { grid-template-columns: 1fr; gap: 0.35rem; }
  .point-code { font-size: 1.3rem; }
  .cta { padding: 1.4rem 1.15rem; }
  .button { width: 100%; text-align: center; }
  .button.secondary { margin: 0.55rem 0 0; }
  .footer-inner { flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}

@media print {
  .topbar, .toc, .cta, .site-footer, .skip { display: none; }
  body { background: #fff; font-size: 11pt; }
  .article-layout { display: block; padding: 0; }
  a { text-decoration: underline; }
  .callout, .card, .table-scroll { break-inside: avoid; }
}

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