/* Feature directory: a compact field guide using the shared site palette. */
.feature-page { font-family: "Avenir Next", "Noto Sans", sans-serif; }
html[lang="zh-Hant"] .feature-page { font-family: "PingFang TC", "Noto Sans TC", sans-serif; }
html[lang="ja"] .feature-page { font-family: "Hiragino Sans", "Noto Sans JP", sans-serif; }
html[lang="ko"] .feature-page { font-family: "Apple SD Gothic Neo", "Noto Sans KR", sans-serif; }
html[lang="th"] .feature-page { font-family: "Thonburi", "Noto Sans Thai", sans-serif; }
.feature-page :focus-visible { outline: 3px solid var(--teal); outline-offset: 5px; }
.feature-page .nav-links { margin-left: auto; }
.feature-page .inner { max-width: 1280px; }
.feature-hero { border-bottom: 1px solid var(--line); background: var(--chip); }
.feature-hero-grid {
  display: grid; grid-template-columns: 1.25fr 1fr;
  gap: clamp(32px, 6vw, 90px); align-items: center;
  padding-top: clamp(42px, 6vw, 80px); padding-bottom: clamp(38px, 5vw, 68px);
}
.feature-hero h1 {
  font-family: Georgia, "Noto Serif", serif;
  font-size: clamp(40px, 5.3vw, 66px); font-weight: 700; letter-spacing: -.035em;
  line-height: 1.25; margin: 12px 0 22px;
}
html[lang="zh-Hant"] .feature-hero h1 { font-family: "Songti TC", "Noto Serif TC", serif; }
html[lang="ja"] .feature-hero h1 { font-family: "Hiragino Mincho ProN", "Noto Serif JP", serif; }
html[lang="ko"] .feature-hero h1 { font-family: "AppleMyungjo", "Noto Serif KR", serif; }
html[lang="th"] .feature-hero h1 { font-family: "Thonburi", "Noto Sans Thai", sans-serif; letter-spacing: 0; line-height: 1.4; }
.feature-hero .lede { max-width: 30em; line-height: 1.9; }
.feature-plan-link { display: inline-flex; align-items: center; gap: 20px; color: var(--teal); font-weight: 650; text-underline-offset: 5px; }
.feature-updated { font-size: 12px; color: var(--muted); margin: 25px 0 0; }
.feature-updated time { margin-left: 8px; font-variant-numeric: tabular-nums; }
.feature-routes { border-top: 2px solid var(--teal); }
.feature-routes a {
  display: grid; grid-template-columns: 36px 1fr 20px; gap: 12px; align-items: center;
  padding: 22px 6px; border-bottom: 1px solid var(--line); text-decoration: none;
  transition: background .15s ease;
}
.feature-routes a:hover { background: var(--surface); }
.feature-route-number { font-family: Georgia, serif; font-size: 20px; color: var(--teal); }
.feature-routes strong { display: block; font-size: 18px; font-weight: 650; }
.feature-routes small { display: block; font-size: 14px; color: var(--muted); margin-top: 5px; }
.feature-layout { display: grid; grid-template-columns: 238px minmax(0, 1fr); gap: clamp(32px, 5vw, 72px); padding-bottom: 56px; }
.feature-index { align-self: start; position: sticky; top: 88px; padding: 34px 0 20px; max-height: calc(100vh - 110px); overflow-y: auto; }
.feature-index-title { font-size: 12px; color: var(--muted); letter-spacing: .08em; margin: 0 0 18px; }
.feature-index ol { list-style: none; margin: 0; padding: 0; }
.feature-index li a { display: flex; gap: 12px; padding: 9px 0; font-size: 13px; line-height: 1.5; text-decoration: none; }
.feature-index li span { font-variant-numeric: tabular-nums; font-size: 11px; color: var(--teal); padding-top: 1px; flex-shrink: 0; }
.feature-index a:hover { color: var(--teal); text-decoration: underline; text-underline-offset: 4px; }
.feature-index-plan { display: block; border-top: 1px solid var(--line); padding: 18px 0 0; margin-top: 18px; font-size: 13px; font-weight: 700; color: var(--teal); text-underline-offset: 4px; }
.feature-content { min-width: 0; }
.feature-scope { font-size: 12px; color: var(--muted); margin: 36px 0 0; }
.feature-market-note { margin-top: 36px; padding: 18px 20px; border: 1px solid var(--line); border-radius: 8px; background: var(--chip); font-size: 14px; }
.feature-market-note strong { color: var(--teal-deep); }
.feature-market-note p { margin: 8px 0 0; color: var(--muted); line-height: 1.85; }
.feature-group { padding: 46px 0 40px; border-bottom: 1px solid var(--line); scroll-margin-top: 95px; }
.feature-section-heading { display: flex; gap: 20px; margin-bottom: 26px; align-items: baseline; }
.feature-number { font: 32px/1 Georgia, serif; color: var(--teal); }
.feature-group h2 { font-size: clamp(23px, 2.4vw, 29px); letter-spacing: -.025em; margin: 0 0 10px; line-height: 1.4; }
.feature-section-heading p, .feature-plan-intro { color: var(--muted); margin: 0; font-size: 14px; line-height: 1.85; }
.feature-items { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 26px 32px; padding: 0; margin: 0; list-style: none; }
.feature-items li { border-left: 2px solid var(--line); padding-left: 16px; }
.feature-items h3 { margin: 0 0 7px; font-size: 16px; line-height: 1.6; font-weight: 650; }
.feature-items p { margin: 0; font-size: 14px; color: var(--muted); line-height: 1.85; }
.feature-related { display: flex; flex-wrap: wrap; gap: 12px 26px; margin-top: 26px; font-size: 13px; color: var(--teal); }
.feature-related a { text-underline-offset: 4px; }
.feature-plans h2 { color: var(--teal-deep); }
.feature-table-wrap { overflow-x: auto; margin-top: 26px; border: 1px solid var(--line); border-radius: 8px; }
.feature-table-wrap table { width: 100%; border-collapse: collapse; font-size: 13px; line-height: 1.75; text-align: left; }
.feature-table-wrap caption { text-align: left; padding: 12px 18px; font-size: 12px; color: var(--muted); }
.feature-table-wrap th, .feature-table-wrap td { padding: 14px 18px; border-top: 1px solid var(--line); vertical-align: top; width: 33.333%; }
.feature-table-wrap thead { background: var(--chip); }
.feature-table-wrap tbody th { font-weight: 600; }
.feature-table-wrap tbody td { color: var(--muted); }
.feature-plan-note { color: var(--muted); font-size: 12px; line-height: 1.85; }
.feature-back-top { display: inline-block; margin-top: 25px; font-size: 13px; color: var(--teal); text-underline-offset: 4px; }
#feature-index, .feature-page #download { scroll-margin-top: 100px; }
.feature-page .cta p:last-child { font-size: 14px; margin-top: 26px; }
.feature-page .footer .feature-related { margin-top: 0; }
@media (max-width: 1050px) {
  .feature-layout { grid-template-columns: 210px minmax(0, 1fr); gap: 30px; }
  .feature-items { column-gap: 22px; }
}
@media (max-width: 760px) {
  .feature-hero-grid { grid-template-columns: 1fr; gap: 30px; }
  .feature-routes a { padding: 15px 4px; }
  .feature-routes strong { font-size: 16px; }
  .feature-routes small { font-size: 13px; }
  .feature-layout { display: block; }
  .feature-index { position: static; max-height: none; overflow: visible; padding: 28px 0; border-bottom: 1px solid var(--line); }
  .feature-index ol { display: grid; grid-template-columns: 1fr 1fr; gap: 0 16px; }
  .feature-index li a { padding: 9px 0; font-size: 12px; gap: 8px; }
  .feature-index-title { margin-bottom: 10px; }
  .feature-index-plan { margin-top: 12px; padding-top: 14px; }
  .feature-scope { margin-top: 24px; }
  .feature-section-heading { gap: 14px; margin-bottom: 24px; }
  .feature-number { font-size: 27px; }
  .feature-group { padding: 32px 0; scroll-margin-top: 120px; }
  .feature-table-wrap table { min-width: 510px; }
  .feature-table-wrap th, .feature-table-wrap td { padding: 12px; }
}
@media (max-width: 520px) {
  .feature-items { grid-template-columns: 1fr; gap: 22px; }
  .feature-hero h1 { font-size: 42px; }
  .feature-page .brand { font-size: 15px; }
  .feature-page .nav-links { flex-basis: 100%; flex-wrap: wrap; gap: 4px 12px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .feature-routes a { transition: none; }
}