:root {
  --ink: #17211d;
  --muted: #65706b;
  --paper: #f4f5f2;
  --white: #ffffff;
  --line: #d9ded9;
  --charcoal: #202825;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: Inter, "Segoe UI", "Microsoft YaHei", Arial, sans-serif;
  line-height: 1.5;
  letter-spacing: 0;
}
a { color: inherit; }
button, input { font: inherit; }
button { cursor: pointer; }
.shell { width: min(1180px, calc(100% - 40px)); margin: 0 auto; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  padding: 10px max(20px, calc((100vw - 1180px) / 2));
  background: rgba(255,255,255,.96);
  border-bottom: 1px solid var(--line);
}
.brand { font-size: 18px; font-weight: 800; text-decoration: none; }
.header-note { color: var(--muted); font-size: 13px; }

.directory-head {
  padding: 46px 0 32px;
  background: var(--charcoal);
  color: var(--white);
}
.eyebrow { margin: 0 0 8px; color: #cbd5d0; font-size: 13px; font-weight: 800; text-transform: uppercase; }
h1 { max-width: 720px; margin: 0; font-size: clamp(34px, 5vw, 58px); line-height: 1.02; }
.intro { max-width: 680px; margin: 18px 0 0; color: #dce3df; font-size: 18px; }

.chooser { padding: 28px 0 64px; }
.controls {
  display: grid;
  grid-template-columns: minmax(220px, 1fr) auto;
  gap: 12px;
  align-items: center;
  margin-bottom: 22px;
}
.search {
  min-height: 46px;
  padding: 10px 13px;
  color: var(--ink);
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 5px;
}
.filters { display: flex; gap: 6px; overflow-x: auto; }
.filter {
  min-height: 42px;
  padding: 8px 12px;
  color: var(--ink);
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 5px;
  white-space: nowrap;
}
.filter.active { color: var(--white); background: var(--charcoal); border-color: var(--charcoal); }

.trail-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.trail-card {
  --trail: #333;
  --soft: #eee;
  position: relative;
  display: grid;
  grid-template-columns: 12px minmax(0, 1fr);
  min-height: 260px;
  overflow: hidden;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 7px;
}
.trail-card[hidden] { display: none; }
.trail-rail { background: var(--trail); }
.trail-body { display: flex; flex-direction: column; padding: 22px; }
.trail-meta { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.district { color: var(--trail); font-weight: 800; text-transform: uppercase; font-size: 13px; }
.status { padding: 3px 7px; color: var(--trail); background: var(--soft); border-radius: 4px; font-size: 12px; font-weight: 800; }
.trail-card h2 { margin: 14px 0 8px; font-size: 27px; line-height: 1.15; }
.trail-summary { margin: 0; color: var(--muted); }
.anchor-line { margin: auto 0 14px; padding-top: 20px; font-size: 14px; }
.anchor-line strong { display: block; color: var(--trail); }
.theme-source { display: block; margin-top: 5px; color: var(--muted); font-size: 12px; }
.featured-node { margin: 0 0 14px; font-size: 14px; }
.featured-node span { display: block; color: var(--muted); }
.featured-node a { color: var(--trail); font-weight: 800; text-decoration: none; }
.featured-node a::after { content: " →"; }
.trail-link { align-self: flex-start; color: var(--trail); font-weight: 800; text-decoration: none; }
.trail-link::after { content: " →"; }
.trail-card.featured { grid-column: 1 / -1; grid-template-columns: 12px minmax(0, 1.05fr) minmax(300px, .95fr); }
.trail-visual-wrap { position: relative; min-width: 0; overflow: hidden; background: #101616; }
.trail-visual {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 300px;
  object-fit: cover;
  object-position: 50% 58%;
  transform: scale(1.12);
}
.photo-credit {
  position: absolute;
  right: 8px;
  bottom: 8px;
  max-width: calc(100% - 16px);
  margin: 0;
  padding: 4px 6px;
  color: #fff;
  background: rgba(16, 22, 22, .88);
  border-radius: 3px;
  font-size: 10px;
  line-height: 1.35;
}
.photo-credit a { color: inherit; }
.trail-empty { padding: 44px; background: var(--white); border: 1px solid var(--line); }

.principle-band { padding: 38px 0; color: var(--white); background: #2a3430; }
.principle-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.principle-grid h2 { margin: 0 0 8px; font-size: 18px; }
.principle-grid p { margin: 0; color: #d6dfda; }
.site-footer { padding: 28px 0; color: var(--muted); font-size: 13px; }

.concept-main { min-height: calc(100vh - 64px); }
.concept-head { padding: 56px 0 42px; color: var(--on-trail, #fff); background: var(--trail, #333); }
.concept-head h1 { max-width: 780px; }
.concept-status { display: inline-block; margin: 0 0 18px; padding: 5px 9px; color: var(--trail); background: var(--soft); border-radius: 4px; font-weight: 800; }
.concept-copy { max-width: 720px; margin: 18px 0 0; font-size: 18px; }
.concept-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 28px; padding: 36px 0 64px; }
.concept-grid h2 { margin: 0 0 12px; font-size: 24px; }
.role-list { display: grid; gap: 10px; padding: 0; list-style: none; }
.role-list li { padding: 14px; background: var(--white); border-left: 5px solid var(--trail); }
.truth-box { padding: 20px; background: var(--soft); border: 1px solid color-mix(in srgb, var(--trail) 30%, white); }
.truth-box p:last-child { margin-bottom: 0; }
.back-link { display: inline-block; margin-top: 24px; font-weight: 800; }

@media (max-width: 760px) {
  .shell { width: min(100% - 24px, 1180px); }
  .site-header { min-height: 58px; padding: 8px 12px; }
  .header-note { display: none; }
  .directory-head { padding: 34px 0 28px; }
  .intro { font-size: 16px; }
  .controls { grid-template-columns: 1fr; }
  .trail-grid { grid-template-columns: 1fr; }
  .trail-card.featured { grid-column: auto; grid-template-columns: 10px minmax(0, 1fr); }
  .trail-card.featured .trail-visual-wrap { grid-column: 2; min-height: 190px; }
  .trail-card.featured .trail-visual { height: auto; min-height: 190px; aspect-ratio: 16 / 9; }
  .trail-card.featured .photo-credit {
    position: relative;
    right: auto;
    bottom: auto;
    max-width: none;
    padding: 5px 8px;
    border-radius: 0;
    font-size: 9px;
  }
  .trail-card { grid-template-columns: 10px minmax(0, 1fr); min-height: 240px; }
  .trail-body { padding: 18px; }
  .trail-card h2 { font-size: 24px; }
  .principle-grid, .concept-grid { grid-template-columns: 1fr; }
}

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