@import url("https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght@9..144,500;9..144,650&family=Inter:wght@400;500;600&display=swap");

:root {
  --bg: #0e1014;
  --paper: #16181e;
  --ink: #f3efe6;
  --muted: #9b968c;
  --line: #2a2d36;
  --accent: #d7f25a;
  --accent-ink: #12140c;
  --link: #8ec8ff;
  --warn: #ffb45a;
  --ok: #7ee0a8;
  --max: 760px;
  --wide: 1080px;
  --radius: 14px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
html[lang="zh"] body, html[lang="ja"] body {
  font-family: Inter, "Noto Sans SC", "Noto Sans JP", "PingFang SC", "Hiragino Sans", sans-serif;
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: Inter, system-ui, sans-serif;
  font-size: 17px;
  line-height: 1.65;
}
a { color: var(--link); text-underline-offset: 3px; }
a:hover { color: var(--accent); }
img { max-width: 100%; }
code, kbd {
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  font-size: 0.88em;
  background: #0b0c10;
  padding: 0.12em 0.4em;
  border-radius: 6px;
  border: 1px solid var(--line);
}
.skip {
  position: absolute;
  left: -999px;
  top: 0;
}
.skip:focus {
  left: 12px;
  top: 12px;
  z-index: 50;
  background: var(--accent);
  color: var(--accent-ink);
  padding: 8px 12px;
  border-radius: 8px;
}

.top {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(14, 16, 20, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.top-inner {
  max-width: var(--wide);
  margin: 0 auto;
  padding: 12px 20px;
  display: flex;
  align-items: center;
  gap: 18px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--ink);
  font-weight: 600;
  letter-spacing: -0.03em;
  flex-shrink: 0;
}
.brand .logo {
  display: block;
  height: 22px;
  width: auto;
}
.brand-sub {
  font-size: 11px;
  font-weight: 600;
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 2px 8px;
}
.nav {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-left: auto;
}
.nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
}
.nav a:hover, .nav a[aria-current="page"] { color: var(--ink); }
.langs {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-left: 8px;
}
.langs a {
  color: var(--muted);
  text-decoration: none;
  font-size: 12px;
  font-weight: 600;
  padding: 3px 7px;
  border: 1px solid transparent;
  border-radius: 999px;
}
.langs a[aria-current="true"] {
  color: var(--accent-ink);
  background: var(--accent);
  border-color: var(--accent);
}
.menu-btn {
  display: none;
  margin-left: auto;
  background: transparent;
  border: 1px solid var(--line);
  color: var(--ink);
  border-radius: 8px;
  padding: 6px 10px;
  cursor: pointer;
}

.wrap { max-width: var(--max); margin: 0 auto; padding: 36px 20px 80px; }
.wrap.wide { max-width: var(--wide); }
.kicker {
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 600;
  margin: 0 0 10px;
}
h1, h2, h3 {
  font-family: Fraunces, Georgia, serif;
  letter-spacing: -0.03em;
  line-height: 1.15;
  font-weight: 650;
}
h1 { font-size: clamp(32px, 5vw, 48px); margin: 0 0 16px; }
h2 { font-size: 28px; margin: 42px 0 12px; }
h3 { font-size: 20px; margin: 28px 0 8px; }
.lede { font-size: 20px; color: #d7d2c6; margin: 0 0 22px; }
.meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  color: var(--muted);
  font-size: 13px;
  margin: 0 0 28px;
}
.answer {
  background: var(--paper);
  border: 1px solid var(--line);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius);
  padding: 18px 20px;
  margin: 0 0 32px;
}
.answer p { margin: 0; }
.note {
  background: #1b1712;
  border: 1px solid #3a3224;
  color: #f0d7b0;
  border-radius: var(--radius);
  padding: 14px 16px;
  font-size: 15px;
}
.crumbs { font-size: 13px; color: var(--muted); margin: 0 0 18px; }
.crumbs a { color: var(--muted); }

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 14px;
  margin: 24px 0 8px;
}
.card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  text-decoration: none;
  color: inherit;
  display: block;
}
.card:hover { border-color: #4a4e5a; }
.card h3 { margin: 0 0 8px; font-size: 20px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
  margin: 12px 0 24px;
}
th, td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
th { color: var(--muted); font-weight: 600; font-size: 12px; text-transform: uppercase; letter-spacing: 0.06em; }
.table-wrap { overflow-x: auto; }

ol.steps { padding-left: 22px; }
ol.steps li { margin: 0 0 12px; }

.faq details {
  border-bottom: 1px solid var(--line);
  padding: 12px 0;
}
.faq summary { cursor: pointer; font-weight: 600; }
.faq p { margin: 8px 0 0; color: #d7d2c6; }

.sources { font-size: 14px; color: var(--muted); }
.sources li { margin: 0 0 8px; }

.hero {
  max-width: var(--wide);
  margin: 0 auto;
  padding: 48px 20px 12px;
}
.hero h1 { max-width: 18ch; }
.badge {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 4px 10px;
  color: var(--muted);
  margin-bottom: 14px;
}

.footer {
  border-top: 1px solid var(--line);
  padding: 28px 20px 48px;
  color: var(--muted);
  font-size: 13px;
}
.footer-inner {
  max-width: var(--wide);
  margin: 0 auto;
  display: grid;
  gap: 18px;
}
.footer a { color: var(--muted); }
.footer nav { display: flex; flex-wrap: wrap; gap: 12px 16px; }

figure.shot {
  margin: 20px 0 28px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 12px;
}
figure.shot img {
  width: 100%;
  max-width: 420px;
  height: auto;
  display: block;
  margin: 0 auto;
  border-radius: 12px;
}
.shot-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
  margin: 20px 0 36px;
}
.shot-grid figure.shot { margin: 0; }
.shot-grid figure.shot img { max-width: 100%; }
figcaption {
  color: var(--muted);
  font-size: 13px;
  margin-top: 10px;
  text-align: left;
  line-height: 1.45;
}
.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 22px 0 8px;
}
.cta {
  display: inline-flex;
  align-items: center;
  background: var(--accent);
  color: var(--accent-ink);
  text-decoration: none;
  font-weight: 600;
  font-size: 15px;
  padding: 10px 16px;
  border-radius: 999px;
}
.cta.ghost {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--line);
}
.home-hero {
  padding: 28px 0 8px;
}
.home-hero h1 { max-width: 16ch; }
.wrap.wide { max-width: var(--wide); }
.cite {
  font-size: 14px;
  color: var(--muted);
}
.cite a { color: var(--muted); }

@media (max-width: 760px) {
  .menu-btn { display: inline-flex; }
  .nav {
    display: none;
    position: absolute;
    left: 0; right: 0; top: 53px;
    background: #12141a;
    border-bottom: 1px solid var(--line);
    padding: 12px 20px 18px;
    flex-direction: column;
  }
  .nav.open { display: flex; }
  body { font-size: 16px; }
}