:root {
  --ochre: #9E3B2E;
  --ochre-deep: #7A2A21;
  --ink-green: #16332B;
  --ink-green-soft: #24503F;
  --gold: #C9A227;
  --snow: #F7F4EE;
  --stone: #E3DED3;
  --ink: #14110F;
  --ink-soft: #3A342E;
  --white: #FFFFFF;
  --grey: #6E7B75;

  --hairline: #D8D2C5;
  --line-gold: rgba(201, 162, 39, 0.38);
  --line-light: rgba(247, 244, 238, 0.14);

  --rail-w: 224px;
  --rail-h: 62px;
  --shell-pad: clamp(20px, 4.5vw, 60px);
  --maxw: 1180px;

  --font-display: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "SimSun", serif;
  --font-sans: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --ease: cubic-bezier(.2, .7, .3, 1);
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background-color: var(--snow);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16.5px;
  line-height: 1.85;
  letter-spacing: 0.012em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 0.6em;
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: -0.005em;
  color: var(--ink);
}

h1 { font-size: clamp(34px, 5.4vw, 60px); }
h2 { font-size: clamp(26px, 3.2vw, 38px); }
h3 { font-size: clamp(19px, 2vw, 24px); }
h4 { font-size: 18px; }

p { margin: 0 0 1.1em; }
p:last-child { margin-bottom: 0; }

ul, ol { margin: 0 0 1.1em; padding-left: 1.3em; }
ul[class], ol[class] { list-style: none; padding-left: 0; margin-bottom: 0; }

a { color: inherit; }
a:focus-visible,
button:focus-visible { outline: 2px solid var(--gold); outline-offset: 3px; }

button { font: inherit; }

img, svg, video { max-width: 100%; }
img { display: block; }

hr { border: 0; border-top: 1px solid var(--hairline); margin: 0; }

::selection { background: var(--ochre); color: var(--white); }

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- shell offset ---------- */
@media (min-width: 1080px) {
  body { padding-left: var(--rail-w); }
}
@media (max-width: 1079px) {
  body { padding-top: var(--rail-h); }
}

#main-content { scroll-margin-top: calc(var(--rail-h) + 16px); }
@media (min-width: 1080px) { #main-content { scroll-margin-top: 16px; } }

/* ---------- skip link ---------- */
.skip-link {
  position: fixed;
  top: 0; left: 0;
  z-index: 400;
  padding: 10px 18px;
  background-color: var(--gold);
  color: var(--ink-green);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  text-decoration: none;
  transform: translateY(-140%);
  transition: transform 0.2s var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible { transform: translateY(0); }

/* ---------- rail header ---------- */
.rail {
  position: fixed;
  z-index: 120;
  background-color: var(--ink-green);
  color: var(--snow);
}

.rail-meter {
  position: fixed;
  top: 0; left: 0;
  width: 100%;
  height: 3px;
  z-index: 200;
  background-color: rgba(201, 162, 39, 0.14);
  pointer-events: none;
}
.rail-meter-fill {
  display: block;
  width: 0;
  height: 100%;
  background-color: var(--gold);
}

.rail-body {
  display: flex;
  flex-direction: column;
  width: 100%;
}

.rail-head {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--snow);
}
.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 34px;
  height: 34px;
  flex: 0 0 auto;
  background-color: var(--gold);
  color: var(--ink-green);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1;
}
.brand-text { display: block; }
.brand-name {
  display: block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 16px;
  line-height: 1.2;
  letter-spacing: 0.05em;
}
.brand-sub {
  display: block;
  margin-top: 3px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  line-height: 1.4;
  color: rgba(247, 244, 238, 0.58);
}

.rail-tagline {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: rgba(247, 244, 238, 0.5);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 9px 13px;
  background-color: transparent;
  border: 1px solid var(--line-gold);
  color: var(--gold);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  cursor: pointer;
  transition: background-color 0.2s var(--ease), color 0.2s var(--ease);
}
.nav-toggle:hover { background-color: rgba(201, 162, 39, 0.12); }
.nav-toggle-lines {
  position: relative;
  display: block;
  width: 16px;
  height: 2px;
  background-color: currentColor;
  transition: background-color 0.2s var(--ease);
}
.nav-toggle-lines::before,
.nav-toggle-lines::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 2px;
  background-color: currentColor;
  transition: transform 0.22s var(--ease);
}
.nav-toggle-lines::before { top: -6px; }
.nav-toggle-lines::after { top: 6px; }
.rail[data-open] .nav-toggle-lines { background-color: transparent; }
.rail[data-open] .nav-toggle-lines::before { transform: translateY(6px) rotate(45deg); }
.rail[data-open] .nav-toggle-lines::after { transform: translateY(-6px) rotate(-45deg); }

.rail-nav { border-top: 1px solid var(--line-light); }
.rail-list { margin: 0; padding: 0; list-style: none; }

.rail-link {
  position: relative;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 20px;
  border-bottom: 1px solid var(--line-light);
  color: rgba(247, 244, 238, 0.72);
  font-size: 14.5px;
  line-height: 1.4;
  text-decoration: none;
  transition: color 0.2s var(--ease), background-color 0.2s var(--ease);
}
.rail-idx {
  min-width: 18px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--gold);
  opacity: 0.85;
}
.rail-link:hover,
.rail-link:focus-visible {
  color: var(--snow);
  background-color: rgba(255, 255, 255, 0.06);
}
.rail-link[aria-current="page"] {
  color: var(--snow);
  font-weight: 700;
  background-color: rgba(201, 162, 39, 0.1);
}
.rail-link[aria-current="page"]::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 3px;
  height: 18px;
  background-color: var(--gold);
  transform: translateY(-50%);
}

.rail-utility {
  display: grid;
  gap: 12px;
  padding: 20px;
}
.rail-cta {
  width: 100%;
  padding: 12px 14px;
  font-size: 12px;
}
.rail-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
}
.rail-links a {
  color: rgba(247, 244, 238, 0.7);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.rail-links a:hover,
.rail-links a:focus-visible {
  color: var(--gold);
  border-bottom-color: var(--gold);
}

@media (min-width: 1080px) {
  .rail {
    top: 0; left: 0;
    width: var(--rail-w);
    height: 100vh;
    height: 100dvh;
    border-right: 1px solid var(--line-gold);
  }
  .rail::before {
    content: "";
    position: absolute;
    top: 0; bottom: 0; left: 0;
    width: 7px;
    background-image: repeating-linear-gradient(to bottom, var(--line-gold) 0 1px, transparent 1px 14px);
    opacity: 0.75;
    pointer-events: none;
  }
  .rail-body {
    height: 100%;
    padding: 30px 0 22px;
    overflow-y: auto;
  }
  .rail-head {
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
    padding: 0 20px;
  }
  .rail-drawer {
    display: flex;
    flex-direction: column;
    flex: 1 1 auto;
    margin-top: 26px;
  }
  .rail-utility { margin-top: auto; }
}

@media (max-width: 1079px) {
  .rail {
    top: 0; left: 0; right: 0;
    max-height: 100vh;
    max-height: 100dvh;
    overflow-y: auto;
    border-bottom: 1px solid var(--line-gold);
  }
  .rail-head {
    justify-content: space-between;
    min-height: var(--rail-h);
    padding: 0 16px;
  }
  .rail-tagline { display: none; }
  .nav-toggle { display: inline-flex; }
  .rail-drawer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s var(--ease);
  }
  .rail[data-open] .rail-drawer {
    max-height: 76vh;
    overflow-y: auto;
  }
  .rail-link { padding: 14px 16px; }
  .rail-utility {
    padding: 16px;
    border-top: 1px solid var(--line-light);
  }
}

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 22px;
  border: 1px solid transparent;
  border-radius: 0;
  background-color: transparent;
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 500;
  letter-spacing: 0.1em;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.btn-primary {
  background-color: var(--ochre);
  color: var(--white);
}
.btn-primary:hover,
.btn-primary:focus-visible { background-color: var(--ochre-deep); }
.btn-ghost {
  border-color: var(--ink-green);
  color: var(--ink-green);
}
.btn-ghost:hover,
.btn-ghost:focus-visible {
  background-color: var(--ink-green);
  color: var(--snow);
}

/* ---------- layout utilities ---------- */
.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--shell-pad);
}

.section { padding-block: clamp(56px, 8vw, 104px); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.22em;
  color: var(--ochre);
}
.eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  background-color: var(--gold);
}

.lede {
  max-width: 34em;
  font-size: clamp(17px, 1.7vw, 19px);
  line-height: 1.8;
  color: var(--ink-soft);
}

.mono {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--grey);
}

.archive-id {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--ochre);
  border-bottom: 1px solid var(--gold);
  padding-bottom: 2px;
}

.tag {
  display: inline-block;
  padding: 3px 8px;
  border: 1px solid var(--line-gold);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--ink-green);
}

.rule {
  width: 100%;
  margin: 0;
  border: 0;
  border-top: 1px solid var(--hairline);
}

.grid {
  display: grid;
  gap: clamp(20px, 3vw, 36px);
}
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
@media (max-width: 900px) {
  .grid-2, .grid-3 { grid-template-columns: minmax(0, 1fr); }
}

/* ---------- breadcrumb ---------- */
.breadcrumb {
  padding-block: 18px;
  border-bottom: 1px solid var(--hairline);
}
.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--grey);
}
.breadcrumb-link {
  color: var(--grey);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}
.breadcrumb-link:hover,
.breadcrumb-link:focus-visible { color: var(--ochre); }
.breadcrumb-sep { color: var(--gold); }
.breadcrumb-current { color: var(--ink-green); font-weight: 500; }

/* ---------- media & framing ---------- */
.media {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background-color: var(--stone);
  border: 1px solid var(--hairline);
}
.media > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.9) contrast(1.03);
}
.media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.08;
  background-image: repeating-linear-gradient(45deg, rgba(20, 17, 15, 0.9) 0 1px, transparent 1px 3px);
}
.media-caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.7;
  letter-spacing: 0.06em;
  color: var(--grey);
}

.frame {
  position: relative;
  padding: clamp(14px, 2vw, 26px);
  border: 1px solid var(--line-gold);
}
.frame::before,
.frame::after {
  content: "";
  position: absolute;
  width: 13px;
  height: 13px;
  pointer-events: none;
}
.frame::before {
  top: -1px; left: -1px;
  border-top: 2px solid var(--gold);
  border-left: 2px solid var(--gold);
}
.frame::after {
  bottom: -1px; right: -1px;
  border-bottom: 2px solid var(--gold);
  border-right: 2px solid var(--gold);
}

/* ---------- reveal ---------- */
.has-js [data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.34s var(--ease), transform 0.34s var(--ease);
}
.has-js [data-reveal].is-in {
  opacity: 1;
  transform: none;
}

/* ---------- footer ---------- */
.site-foot {
  margin-top: clamp(40px, 6vw, 88px);
  background-color: var(--ink-green);
  color: rgba(247, 244, 238, 0.72);
  border-top: 1px solid var(--gold);
}

.foot-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr) minmax(0, 0.85fr) minmax(0, 1.15fr);
  gap: clamp(26px, 3.6vw, 52px);
  max-width: var(--maxw);
  margin-inline: auto;
  padding: clamp(44px, 6vw, 76px) var(--shell-pad) clamp(30px, 4vw, 48px);
}

.foot-intro { min-width: 0; }
.foot-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 18px;
  letter-spacing: 0.04em;
  line-height: 1.3;
  color: var(--snow);
}
.foot-mark {
  display: inline-grid;
  place-items: center;
  width: 30px;
  height: 30px;
  flex: 0 0 auto;
  background-color: var(--gold);
  color: var(--ink-green);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1;
}
.foot-tag {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.18em;
  color: rgba(247, 244, 238, 0.52);
}

.foot-col { min-width: 0; }
.foot-col-title {
  margin: 0 0 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line-light);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.2em;
  line-height: 1.4;
  color: var(--gold);
}
.foot-col-list {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.foot-col-link {
  font-size: 14.5px;
  line-height: 1.6;
  color: rgba(247, 244, 238, 0.76);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.foot-col-link:hover,
.foot-col-link:focus-visible {
  color: var(--snow);
  border-bottom-color: var(--gold);
}

.foot-meta { min-width: 0; }
.foot-meta-line {
  margin: 0 0 12px;
  font-size: 13.5px;
  line-height: 1.7;
  color: rgba(247, 244, 238, 0.72);
  overflow-wrap: anywhere;
}
.foot-meta-key {
  display: block;
  margin-bottom: 2px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.18em;
  color: rgba(247, 244, 238, 0.42);
}
.foot-meta-note {
  margin: 14px 0 0;
  font-family: var(--font-mono);
  font-size: 10.5px;
  line-height: 1.9;
  letter-spacing: 0.06em;
  color: rgba(247, 244, 238, 0.42);
}

.foot-base {
  border-top: 1px solid var(--line-light);
}
.foot-base-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px 24px;
  max-width: var(--maxw);
  margin-inline: auto;
  padding: 20px var(--shell-pad) 30px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  line-height: 1.7;
  color: rgba(247, 244, 238, 0.48);
}
.foot-copy { margin: 0; }
.foot-legal { margin: 0; color: rgba(247, 244, 238, 0.52); }
.foot-base-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.foot-base-links a {
  color: rgba(247, 244, 238, 0.6);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}
.foot-base-links a:hover,
.foot-base-links a:focus-visible { color: var(--gold); }

@media (max-width: 1020px) {
  .foot-inner { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
  .foot-intro { grid-column: 1 / -1; }
}
@media (max-width: 600px) {
  .foot-inner { grid-template-columns: minmax(0, 1fr); }
  .foot-intro { grid-column: auto; }
  .foot-base-inner { flex-direction: column; align-items: flex-start; }
}

/* ---------- motion preferences ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .has-js [data-reveal],
  .has-js [data-reveal].is-in {
    opacity: 1;
    transform: none;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}