:root {
  --turf-green: #1B4D3E;
  --gold: #E8B84B;
  --speed-orange: #F26934;
  --stone-grey: #A5A29D;
  --clay: #C06E52;
  --sand: #E8DCC8;
  --mountain-dark: #0F201A;
  --cream: #F5F0E8;
  --teal-mist: #416B5E;
  --white: #FFFFFF;
  --font-body: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", "Source Han Sans CN", sans-serif;
  --font-data: "Roboto Mono", "JetBrains Mono", "SF Mono", Menlo, Consolas, monospace;
  --container: 1240px;
  --space-pad: clamp(1rem, 3vw, 2rem);
}

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

html { background: var(--mountain-dark); font-size: 16px; -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  min-height: 100vh;
  margin: 0;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.9;
  color: var(--cream);
  background: linear-gradient(155deg, var(--turf-green) 0%, var(--mountain-dark) 85%);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    radial-gradient(ellipse 900px 460px at 85% -5%, rgba(232,184,75,.08), transparent 60%),
    radial-gradient(ellipse 560px 320px at -6% 36%, rgba(242,105,52,.05), transparent 52%),
    radial-gradient(ellipse 1200px 500px at 50% 115%, rgba(65,107,94,.08), transparent 65%),
    repeating-linear-gradient(115deg, rgba(245,240,232,.014) 0 2px, transparent 2px 11px);
}

#main-content, .site-footer { position: relative; z-index: 1; }
#main-content { outline: none; }

h1, h2, h3, h4, h5, h6 { line-height: 1.2; font-weight: 900; color: var(--cream); }
p, ul, ol, dl, dd, figure, blockquote { margin: 0; }
ul, ol { padding: 0; }
img, svg, video { display: block; max-width: 100%; }
a { color: inherit; text-underline-offset: 3px; }
button { font: inherit; color: inherit; cursor: pointer; background: none; border: none; padding: 0; }

::selection { background: var(--gold); color: var(--mountain-dark); }
:focus-visible { outline: 2px solid var(--speed-orange); outline-offset: 3px; }
a:focus-visible, button:focus-visible { border-radius: 2px; }

::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-track { background: #0A1712; }
::-webkit-scrollbar-thumb { background: var(--teal-mist); border: 2px solid #0A1712; }

.skip-link {
  position: fixed;
  top: -100px;
  left: 1rem;
  z-index: 200;
  padding: .65rem 1.1rem;
  background: var(--gold);
  color: var(--mountain-dark);
  font-weight: 700;
  text-decoration: none;
  border: 1px solid var(--mountain-dark);
  transition: top .16s ease;
}
.skip-link:focus { top: .75rem; }

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

.container { width: 100%; max-width: var(--container); margin-inline: auto; padding-inline: var(--space-pad); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  border-top: 2px solid var(--gold);
  border-bottom: 1px solid rgba(165,162,157,.35);
  background: linear-gradient(180deg, rgba(27,77,62,.94), rgba(15,32,26,.94));
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  box-shadow: 0 8px 24px rgba(8,18,14,.25);
}
.scroll-progress {
  position: absolute;
  top: -2px;
  left: 0;
  height: 3px;
  width: 0%;
  z-index: 3;
  background: linear-gradient(90deg, var(--gold), var(--speed-orange));
}
.header-inner { display: flex; align-items: center; gap: 1rem; min-height: 72px; }

.brand { display: flex; align-items: center; gap: .75rem; flex-shrink: 0; text-decoration: none; }
.brand-mark {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 3px;
  width: 38px;
  height: 38px;
  padding: 8px 7px;
  border: 1px solid rgba(232,184,75,.6);
  background: linear-gradient(145deg, rgba(232,184,75,.08), transparent 60%);
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 0 100%);
}
.brand-mark-line {
  height: 2px;
  background: linear-gradient(90deg, var(--gold) 0 62%, var(--speed-orange) 62% 100%);
  transform: skewX(-32deg);
}
.brand-mark-line:nth-child(2) { width: 78%; opacity: .8; }
.brand-mark-line:nth-child(3) { width: 56%; opacity: .6; }
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-name { font-size: 1.2rem; font-weight: 900; letter-spacing: .12em; color: var(--cream); }
.brand-claim { margin-top: 3px; font-size: .7rem; letter-spacing: .28em; color: var(--stone-grey); }

.main-nav { flex: 1; }
.nav-list { display: flex; justify-content: flex-end; gap: 2px; flex-wrap: wrap; list-style: none; margin: 0; padding: 0; }
.nav-link {
  display: flex;
  align-items: center;
  gap: .5em;
  padding: .55em .8em;
  border: 1px solid transparent;
  font-size: .92rem;
  color: var(--sand);
  letter-spacing: .06em;
  text-decoration: none;
  white-space: nowrap;
  transition: background-color .16s ease, color .16s ease, border-color .16s ease, box-shadow .16s ease;
}
.nav-link:hover { color: var(--cream); background: rgba(232,184,75,.08); border-color: rgba(232,184,75,.35); }
.nav-key { font-family: var(--font-data); font-size: .68rem; color: var(--stone-grey); letter-spacing: .05em; }
.nav-link[aria-current="page"] {
  color: var(--gold);
  background: rgba(232,184,75,.14);
  box-shadow: inset 0 2px 0 var(--gold), inset 0 -2px 0 var(--speed-orange);
}
.nav-link[aria-current="page"] .nav-key { color: var(--speed-orange); }

.header-command {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  margin: 0 0 0 .5rem;
  padding: .45em .85em;
  border: 1px dashed rgba(165,162,157,.5);
  font-family: var(--font-data);
  font-size: .75rem;
  color: var(--stone-grey);
  white-space: nowrap;
}
.command-dot { width: 6px; height: 6px; background: var(--speed-orange); transform: rotate(45deg); flex-shrink: 0; }

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  flex-shrink: 0;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  border: 1px solid rgba(165,162,157,.4);
  background: transparent;
  padding: 0;
}
.nav-toggle-bar { width: 22px; height: 2px; background: var(--gold); transition: transform .16s ease, opacity .16s ease; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.site-footer { background: linear-gradient(180deg, rgba(27,77,62,.96), rgba(15,32,26,.98) 70%); }
.footer-band { border-top: 3px solid var(--gold); border-bottom: 1px dashed rgba(165,162,157,.35); background: rgba(232,184,75,.05); }
.footer-band-inner { display: flex; align-items: center; justify-content: space-between; gap: 1.5rem; padding-block: clamp(2rem, 4vw, 3.5rem); }
.footer-band-text { display: grid; gap: .6rem; }
.footer-band-title { margin: 0; font-size: clamp(1.35rem, 3vw, 2.1rem); font-weight: 900; letter-spacing: .02em; color: var(--cream); }

.footer-main { border-bottom: 1px dotted rgba(165,162,157,.25); }
.footer-grid { display: grid; gap: clamp(1.5rem, 4vw, 2.5rem); padding-block: clamp(2.5rem, 6vw, 4rem) clamp(2rem, 4vw, 3rem); grid-template-columns: 1fr; }

.footer-brand { display: inline-flex; align-items: center; gap: .7rem; margin-bottom: 1.1rem; text-decoration: none; }
.footer-brand .brand-mark { width: 30px; height: 30px; padding: 6px 5px; }
.footer-brand-name { font-size: 1.3rem; font-weight: 900; letter-spacing: .1em; color: var(--cream); }
.footer-about-text { color: var(--sand); font-size: .95rem; max-width: 48ch; }
.footer-trust { margin-top: 1.1rem; padding: .9rem 1.1rem; border-left: 3px solid var(--gold); background: rgba(232,184,75,.06); color: var(--stone-grey); font-size: .85rem; max-width: 56ch; }

.footer-heading {
  margin: 0 0 1rem;
  padding-bottom: .5rem;
  border-bottom: 1px dashed rgba(232,184,75,.25);
  font-size: .82rem;
  letter-spacing: .18em;
  color: var(--gold);
}
.footer-list, .footer-contact-list { display: grid; gap: .55rem; list-style: none; margin: 0; padding: 0; }
.footer-list a { display: inline-flex; align-items: center; gap: .5rem; color: var(--sand); font-size: .92rem; text-decoration: none; }
.footer-list a::before { content: ""; width: 0; height: 2px; background: var(--speed-orange); transition: width .16s ease; }
.footer-list a:hover { color: var(--gold); }
.footer-list a:hover::before { width: 14px; }
.footer-contact-list li { display: flex; gap: .7rem; color: var(--sand); font-size: .9rem; line-height: 1.6; }
.contact-key { flex: 0 0 2.4em; color: var(--gold); font-size: .8rem; font-weight: 700; letter-spacing: .1em; }

.footer-bottom { border-top: 1px solid rgba(165,162,157,.22); background: rgba(10,23,17,.5); }
.footer-bottom-inner { display: flex; flex-wrap: wrap; justify-content: space-between; gap: .6rem 1.5rem; padding-block: 1.3rem; color: var(--stone-grey); font-size: .85rem; }
[data-year] { font-variant-numeric: tabular-nums; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .6rem;
  padding: .85rem 1.6rem;
  border: 1px solid transparent;
  background: transparent;
  font-weight: 700;
  font-size: .95rem;
  letter-spacing: .06em;
  line-height: 1;
  text-decoration: none;
  cursor: pointer;
  transition: transform .16s ease, background-color .16s ease, border-color .16s ease, color .16s ease, box-shadow .16s ease;
}
@media (hover: hover) { .btn:hover { transform: translateY(-2px); } }
.btn--primary { background: var(--gold); border-color: var(--gold); color: var(--mountain-dark); box-shadow: 0 6px 0 rgba(15,32,26,.28); }
.btn--primary:hover { background: #F0C45E; border-color: #F0C45E; box-shadow: 0 8px 0 rgba(15,32,26,.24); }
.btn--ghost { border-color: var(--stone-grey); color: var(--cream); }
.btn--ghost:hover { border-color: var(--gold); color: var(--gold); }
.btn--orange { background: var(--speed-orange); border-color: var(--speed-orange); color: var(--white); box-shadow: 0 6px 0 rgba(15,32,26,.24); }
.btn--orange:hover { background: #FC7A47; border-color: #FC7A47; box-shadow: 0 8px 0 rgba(15,32,26,.2); }
.btn--arrow::after {
  content: "";
  flex-shrink: 0;
  width: .55em;
  height: .55em;
  border-top: 2px solid currentColor;
  border-right: 2px solid currentColor;
  transform: rotate(45deg);
  transition: transform .16s ease;
}
.btn--arrow:hover::after { transform: translate(3px, -3px) rotate(45deg); }

.tag {
  display: inline-flex;
  align-items: center;
  padding: .4em .9em;
  font-size: .72rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: .14em;
  background: var(--gold);
  color: var(--mountain-dark);
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 0 100%);
}
.tag--gold { background: var(--gold); color: var(--mountain-dark); }
.tag--clay { background: var(--clay); color: var(--cream); }
.tag--outline { background: transparent; border: 1px solid var(--gold); color: var(--gold); }

.section-label {
  display: inline-flex;
  align-items: center;
  gap: .6rem;
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .22em;
  color: var(--gold);
  text-transform: uppercase;
}
.section-label::before { content: ""; width: 24px; height: 1px; background: var(--speed-orange); }

.index-number {
  display: block;
  font-family: var(--font-data);
  font-weight: 200;
  font-size: clamp(4rem, 8vw, 7rem);
  line-height: .8;
  color: rgba(232,184,75,.12);
  -webkit-text-stroke: 1px rgba(232,184,75,.3);
  user-select: none;
  pointer-events: none;
}

.stat-number {
  font-family: var(--font-data);
  font-weight: 700;
  font-size: clamp(2rem, 4vw, 3.25rem);
  line-height: 1;
  color: var(--gold);
  font-variant-numeric: tabular-nums;
}
.stat-number--orange { color: var(--speed-orange); }

.line-note { font-size: .8rem; letter-spacing: .08em; color: var(--stone-grey); }

.grid { display: grid; grid-template-columns: repeat(12, 1fr); gap: clamp(1rem, 2vw, 1.5rem); }
.span-4 { grid-column: span 4; }
.span-5 { grid-column: span 5; }
.span-6 { grid-column: span 6; }
.span-7 { grid-column: span 7; }
.span-8 { grid-column: span 8; }
.span-12 { grid-column: 1 / -1; }

.panel {
  position: relative;
  padding: clamp(2.5rem, 4vw, 3rem) clamp(1.25rem, 3vw, 2rem) clamp(1.25rem, 3vw, 2rem);
  border: 1px solid rgba(165,162,157,.3);
  background: linear-gradient(160deg, rgba(245,240,232,.05), rgba(245,240,232,.02));
  transition: transform .16s ease, border-color .16s ease, box-shadow .16s ease;
}
.panel > .tag, .paper-card > .tag { position: absolute; top: 1rem; right: 1rem; }
@media (hover: hover) { .panel:hover, .paper-card:hover { border-color: rgba(232,184,75,.65); transform: translateY(-2px); } }
.panel--light { background: var(--sand); border-color: rgba(15,32,26,.15); color: var(--mountain-dark); }
.panel--light h1, .panel--light h2, .panel--light h3, .paper-card h1, .paper-card h2, .paper-card h3 { color: var(--mountain-dark); }
.panel--dark { background: linear-gradient(160deg, rgba(15,32,26,.92), rgba(27,77,62,.7)); border-color: rgba(232,184,75,.35); }

.paper-card {
  position: relative;
  padding: clamp(2.5rem, 4vw, 3rem) clamp(1.25rem, 3vw, 2rem) clamp(1.25rem, 3vw, 2rem);
  border: 1px solid rgba(15,32,26,.12);
  background: var(--sand);
  color: var(--mountain-dark);
  box-shadow: 4px 4px 0 rgba(232,184,75,.3), 8px 8px 0 rgba(15,32,26,.15);
  transition: transform .16s ease, border-color .16s ease, box-shadow .16s ease;
}
@media (hover: hover) {
  .paper-card:hover { box-shadow: 6px 6px 0 rgba(232,184,75,.4), 12px 12px 0 rgba(15,32,26,.2); }
}

.media { position: relative; overflow: hidden; border: 1px solid rgba(165,162,157,.35); background: linear-gradient(160deg, #0A1712, var(--turf-green)); }
.media::before { content: ""; display: block; padding-bottom: 56.25%; }
.media--4x3::before { padding-bottom: 75%; }
.media--1x1::before { padding-bottom: 100%; }
.media img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, rgba(27,77,62,.22) 0%, transparent 45%), linear-gradient(315deg, rgba(242,105,52,.14), transparent 50%);
  pointer-events: none;
}

.page-lead {
  position: relative;
  padding-block: clamp(2.5rem, 6vw, 4.5rem) clamp(1.5rem, 4vw, 2.5rem);
  margin-bottom: clamp(2.5rem, 6vw, 4rem);
  border-bottom: 1px dashed rgba(165,162,157,.35);
}
.page-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 1rem; margin-bottom: 1rem; }
.page-title { margin: .25rem 0 .75rem; font-size: clamp(2rem, 4vw, 3.5rem); font-weight: 900; letter-spacing: .02em; line-height: 1.15; color: var(--cream); }
.page-lead-text { max-width: 60ch; color: var(--sand); font-size: clamp(1rem, 1.3vw, 1.15rem); }

.breadcrumb { display: flex; flex-wrap: wrap; margin-bottom: 1rem; font-size: .85rem; }
.breadcrumb ol { display: flex; flex-wrap: wrap; gap: .25rem; list-style: none; margin: 0; padding: 0; }
.breadcrumb li { display: flex; align-items: center; }
.breadcrumb li + li::before { content: "/"; margin: 0 .5rem; color: var(--stone-grey); }
.breadcrumb a { color: var(--sand); text-decoration: none; }
.breadcrumb a:hover { color: var(--gold); }
.breadcrumb [aria-current="page"] { color: var(--gold); }

.prose { color: var(--sand); font-size: 1rem; }
.prose p { max-width: 65ch; margin-bottom: 1.1rem; }
.prose a { color: var(--gold); text-decoration: underline; text-underline-offset: 3px; }
.prose ul, .prose ol { margin-bottom: 1.1rem; padding-left: 1.4rem; }
.prose ul { list-style: disc; }
.prose ol { list-style: decimal; }
.prose li { margin-bottom: .4rem; }
.prose blockquote { margin: 1.5rem 0; padding: .75rem 1.25rem; border-left: 3px solid var(--gold); background: rgba(232,184,75,.06); color: var(--cream); }
.prose h2, .prose h3 { margin: 2rem 0 .75rem; color: var(--cream); }
.panel--light .prose a, .paper-card .prose a { color: var(--turf-green); }

@media (min-width: 641px) {
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 901px) {
  .footer-grid { grid-template-columns: 1.5fr 1fr 1fr 1.3fr; }
}

@media (max-width: 900px) {
  .header-inner { min-height: 64px; flex-wrap: wrap; }
  .main-nav { flex-basis: 100%; order: 4; margin-top: .25rem; padding: .5rem 0 0; border-top: 1px dashed rgba(165,162,157,.3); }
  .nav-list { justify-content: flex-start; }
  .header-command { display: none; }

  .span-4, .span-5, .span-6, .span-7, .span-8 { grid-column: 1 / -1; }

  .footer-band-inner { flex-direction: column; align-items: flex-start; }
  .footer-band-inner .btn { width: 100%; }

  html.js .nav-toggle { display: inline-flex; }
  html.js .main-nav {
    order: 0;
    flex: 0 0 auto;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    width: 100%;
    margin-top: 0;
    padding: 0 0 .6rem;
    border-top: 1px solid var(--gold);
    border-bottom: 1px solid rgba(165,162,157,.3);
    background: linear-gradient(180deg, rgba(15,32,26,.98), rgba(27,77,62,.98));
    box-shadow: 0 16px 24px rgba(8,18,14,.35);
    max-height: calc(100vh - 64px);
    overflow-y: auto;
    visibility: hidden;
    opacity: 0;
    transform: translateY(-8px);
    transition: opacity .16s ease, transform .16s ease, visibility .16s;
    pointer-events: none;
  }
  html.js .main-nav[data-open] { visibility: visible; opacity: 1; transform: none; pointer-events: auto; }
  html.js .nav-list { flex-direction: column; align-items: stretch; padding: .5rem 1rem 0; gap: 2px; }
  html.js .nav-link { justify-content: space-between; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
    scroll-behavior: auto !important;
  }
  .scroll-progress, .footer-list a::before, .btn--arrow::after { transition: none; }
}