/* =========================================================
   竞博指南 · 共享站点样式 /assets/site.css
   坐标图纸体系：深空蓝底 + 奶油纸阅读区 + 沙枣金刻度
   ========================================================= */

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  background: #081726;
}

body,
h1, h2, h3, h4, h5, h6,
p, figure, blockquote, dl, dd, ul, ol { margin: 0; }

ul, ol { list-style: none; padding: 0; }

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

button, input, select, textarea { font: inherit; color: inherit; }

/* ---------- tokens ---------- */
:root {
  --night-900: #081726;
  --night-700: #12314A;
  --night-500: #1F4E6B;
  --paper: #F4EBD8;
  --paper-deep: #E7DCC3;
  --gold: #D8A94E;
  --gold-deep: #A97A25;
  --ice: #9FC7C9;
  --poplar: #D9763B;
  --ink: #2A211B;
  --slate: #6F8A99;

  --line-light: rgba(159, 199, 201, 0.20);
  --line-gold: rgba(216, 169, 78, 0.42);
  --line-ink: rgba(42, 33, 27, 0.16);
  --tick: rgba(159, 199, 201, 0.10);

  --font-display: "Barlow Condensed", "Oswald", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Serif SC", "Songti SC", "Source Han Serif SC", "SimSun", serif;
  --font-mono: "IBM Plex Mono", "JetBrains Mono", "SFMono-Regular", Consolas, "Courier New", monospace;

  --fs-xs: 0.75rem;
  --fs-sm: 0.875rem;
  --fs-base: 1rem;
  --fs-md: 1.25rem;
  --fs-lg: 1.75rem;
  --fs-xl: 2.5rem;
  --fs-2xl: 4rem;
  --fs-3xl: 5.5rem;

  --wrap: 1180px;
  --gutter: clamp(1rem, 4vw, 2.5rem);
  --ease: cubic-bezier(0.2, 0.7, 0.25, 1);
  --t-fast: 140ms;
  --t-mid: 180ms;
}

/* ---------- base ---------- */
body {
  background: var(--night-900);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: var(--fs-base);
  line-height: 1.8;
  letter-spacing: 0.02em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a {
  color: inherit;
  text-decoration-color: rgba(216, 169, 78, 0.55);
  text-underline-offset: 0.22em;
  transition: color var(--t-fast) var(--ease), text-decoration-color var(--t-fast) var(--ease);
}

a:hover { text-decoration-color: var(--gold); }

strong { font-weight: 600; color: var(--gold); }

::selection { background: rgba(216, 169, 78, 0.28); color: var(--paper); }

:focus-visible {
  outline: 2px solid var(--ice);
  outline-offset: 3px;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* ---------- layout ---------- */
.wrap {
  width: min(calc(100% - (var(--gutter) * 2)), var(--wrap));
  margin-inline: auto;
}

.section {
  position: relative;
  padding-block: clamp(2.5rem, 6vw, 5rem);
}

.section--night { background: var(--night-900); color: var(--paper); }
.section--dusk { background: var(--night-700); color: var(--paper); }
.section--paper { background: var(--paper); color: var(--ink); }

.section--coords::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(90deg, var(--tick) 0 1px, transparent 1px 64px),
    repeating-linear-gradient(0deg, var(--tick) 0 1px, transparent 1px 64px);
}

.section--coords > .wrap { position: relative; z-index: 1; }

.grid {
  display: grid;
  gap: clamp(1rem, 2.4vw, 2rem);
}

.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--split { grid-template-columns: minmax(0, 1.7fr) minmax(0, 1fr); }
.grid--12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }

.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: span 12; }

.rule {
  height: 1px;
  border: 0;
  margin: 0;
  background: linear-gradient(90deg, var(--gold), rgba(216, 169, 78, 0));
}

/* ---------- typography helpers ---------- */
.eyebrow {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--gold);
}

.section--paper .eyebrow { color: var(--gold-deep); }

.h-display {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.5rem, 7vw, 5.5rem);
  line-height: 0.96;
  letter-spacing: -0.02em;
  text-transform: uppercase;
}

.h-section {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.6rem, 3.4vw, 2.5rem);
  line-height: 1.12;
  letter-spacing: -0.01em;
}

.lede {
  font-family: var(--font-body);
  font-size: clamp(1rem, 1.4vw, 1.125rem);
  line-height: 1.85;
  max-width: 44ch;
  color: rgba(244, 235, 216, 0.86);
}

.section--paper .lede { color: rgba(42, 33, 27, 0.82); }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.55em;
  padding: 0.8em 1.35em;
  border: 1px solid transparent;
  background: transparent;
  color: inherit;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--fs-sm);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  text-decoration: none;
  cursor: pointer;
  transition:
    background-color var(--t-fast) var(--ease),
    border-color var(--t-fast) var(--ease),
    color var(--t-fast) var(--ease);
}

.btn--gold {
  background: var(--gold);
  border-color: var(--gold);
  color: var(--night-900);
}

.btn--gold:hover,
.btn--gold:focus-visible {
  background: var(--gold-deep);
  border-color: var(--gold-deep);
  color: var(--paper);
}

.btn--ghost {
  border-color: var(--line-gold);
  color: var(--paper);
}

.btn--ghost:hover,
.btn--ghost:focus-visible {
  border-color: var(--gold);
  background: rgba(216, 169, 78, 0.12);
  color: var(--gold);
}

.section--paper .btn--ghost {
  border-color: rgba(169, 122, 37, 0.5);
  color: var(--ink);
}

.section--paper .btn--ghost:hover,
.section--paper .btn--ghost:focus-visible {
  border-color: var(--gold-deep);
  background: rgba(169, 122, 37, 0.1);
  color: var(--gold-deep);
}

.btn--quiet {
  padding: 0.2em 0;
  border: 0;
  border-bottom: 1px solid var(--line-gold);
  color: var(--gold);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.16em;
}

.btn--quiet:hover,
.btn--quiet:focus-visible { border-bottom-color: var(--gold); color: var(--paper); }

/* ---------- tags & status ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.45em;
  padding: 0.26em 0.6em;
  border: 1px solid currentColor;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.1em;
  line-height: 1.5;
  text-transform: uppercase;
  white-space: nowrap;
}

.tag--ice { color: var(--ice); border-color: rgba(159, 199, 201, 0.55); }
.tag--gold { color: var(--gold); border-color: rgba(216, 169, 78, 0.55); }
.tag--poplar { color: var(--poplar); border-color: rgba(217, 118, 59, 0.55); }
.tag--slate { color: var(--slate); border-color: rgba(111, 138, 153, 0.55); }

.section--paper .tag--ice { color: #2C6A6C; border-color: rgba(44, 106, 108, 0.45); }
.section--paper .tag--gold { color: #8A6416; border-color: rgba(169, 122, 37, 0.5); }
.section--paper .tag--poplar { color: #A85428; border-color: rgba(168, 84, 40, 0.45); }
.section--paper .tag--slate { color: #4E6673; border-color: rgba(78, 102, 115, 0.4); }

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: currentColor;
  flex: 0 0 auto;
}

/* ---------- cards ---------- */
.card {
  position: relative;
  padding: clamp(1.1rem, 2vw, 1.75rem);
  background: var(--night-700);
  border: 1px solid var(--line-light);
  transition: border-color var(--t-mid) var(--ease), background-color var(--t-mid) var(--ease);
}

.card:hover,
.card:focus-within {
  border-color: rgba(216, 169, 78, 0.6);
  background: #16374F;
}

.card--paper {
  background: #FBF5E8;
  border-color: var(--line-ink);
  color: var(--ink);
}

.card--paper:hover,
.card--paper:focus-within {
  background: #FFFBF1;
  border-color: rgba(169, 122, 37, 0.55);
}

.card--offset { margin-block-start: clamp(0rem, 2vw, 2rem); }

.card__index {
  display: block;
  margin-bottom: 0.6rem;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.2em;
  color: var(--gold);
}

.card__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.15rem, 2vw, 1.5rem);
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.card__text {
  margin-top: 0.6rem;
  font-size: 0.9375rem;
  line-height: 1.8;
}

.card__meta {
  margin-top: 1rem;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.1em;
  color: var(--slate);
}

.section--paper .card__text { color: rgba(42, 33, 27, 0.82); }
.section--paper .card__meta { color: #5C6C74; }

/* ---------- breadcrumbs ---------- */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5em;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--slate);
}

.breadcrumbs__link {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.breadcrumbs__link:hover,
.breadcrumbs__link:focus-visible {
  color: var(--gold);
  border-bottom-color: var(--gold);
}

.breadcrumbs__sep { opacity: 0.65; }

.breadcrumbs__current { color: var(--gold); }

/* ---------- prose ---------- */
.prose {
  max-width: 66ch;
  font-size: clamp(1rem, 0.96rem + 0.25vw, 1.0625rem);
  line-height: 1.85;
  letter-spacing: 0.02em;
}

.prose > * + * { margin-top: 1.1em; }

.prose h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.5rem, 3vw, 2rem);
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin-top: 1.8em;
}

.prose h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.15rem, 2vw, 1.375rem);
  line-height: 1.3;
  margin-top: 1.5em;
}

.prose ul,
.prose ol { padding-left: 1.2em; }

.prose ul { list-style: square; }
.prose ol { list-style: decimal; }

.prose li + li { margin-top: 0.4em; }

.prose a { color: var(--gold); }

.section--paper .prose a { color: var(--gold-deep); }
.section--paper .prose strong { color: var(--gold-deep); }

.prose table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9375rem;
}

.prose th,
.prose td {
  padding: 0.6em 0.8em;
  border-bottom: 1px solid var(--line-light);
  text-align: left;
  vertical-align: top;
}

.prose th {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gold);
}

.section--paper .prose th,
.section--paper .prose td { border-bottom-color: var(--line-ink); }
.section--paper .prose th { color: var(--gold-deep); }

.note {
  padding-left: 1rem;
  border-left: 2px solid var(--gold);
  font-size: 0.9375rem;
  line-height: 1.8;
  color: rgba(244, 235, 216, 0.82);
}

.section--paper .note {
  border-left-color: var(--gold-deep);
  color: rgba(42, 33, 27, 0.8);
}

/* ---------- media (图片容器基础规则) ---------- */
.media {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--line-light);
  background: var(--night-700);
}

.media--tall { aspect-ratio: 4 / 5; }

.media__frame { border: 1px solid var(--line-gold); padding: 0.5rem; }

.media__img {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media__placeholder {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  text-align: center;
  padding: 1rem;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--slate);
  background-image:
    repeating-linear-gradient(0deg, rgba(159, 199, 201, 0.14) 0 1px, transparent 1px 32px),
    repeating-linear-gradient(90deg, rgba(159, 199, 201, 0.14) 0 1px, transparent 1px 32px);
  background-color: var(--night-700);
}

.media__caption {
  margin-top: 0.6rem;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.1em;
  color: var(--slate);
}

/* =========================================================
   页头
   ========================================================= */
.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 200;
  padding: 0.6em 1em;
  background: var(--gold);
  color: var(--night-900);
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  letter-spacing: 0.08em;
  text-decoration: none;
  transform: translateY(-180%);
  transition: transform var(--t-mid) var(--ease);
}

.skip-link:focus-visible,
.skip-link:focus {
  transform: translateY(0);
  outline: 2px solid var(--paper);
  outline-offset: 2px;
}

.masthead {
  position: sticky;
  top: 0;
  z-index: 60;
  background: var(--night-900);
  color: var(--paper);
  border-bottom: 1px solid var(--line-gold);
}

.masthead::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(216, 169, 78, 0.8), transparent);
  pointer-events: none;
}

.masthead__inner { padding-block: 0.7rem 0.45rem; }

.masthead__top {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center;
  gap: 1rem;
  padding-block: 0.35rem;
}

.masthead__coordinate {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 0.9rem;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--slate);
}

.masthead__tick {
  display: inline-flex;
  align-items: center;
  gap: 0.45em;
}

.masthead__tick::before {
  content: "";
  width: 12px;
  height: 1px;
  background: var(--gold);
  flex: 0 0 auto;
}

.masthead__brand {
  display: grid;
  justify-items: center;
  text-align: center;
  padding: 0.2rem 0.5rem;
  text-decoration: none;
  color: inherit;
}

.masthead__kicker {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--gold);
}

.masthead__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.85rem, 4vw, 2.75rem);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--paper);
  transition: color var(--t-fast) var(--ease);
}

.masthead__brand:hover .masthead__title,
.masthead__brand:focus-visible .masthead__title { color: var(--gold); }

.masthead__sub {
  margin-top: 0.45em;
  font-family: var(--font-body);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: rgba(244, 235, 216, 0.62);
}

.masthead__meta {
  display: flex;
  align-items: center;
  justify-self: end;
  gap: 0.6rem;
  min-width: 0;
}

.meta-chip {
  display: grid;
  gap: 0.1em;
  padding: 0.32rem 0.6rem;
  border: 1px solid var(--line-gold);
  text-decoration: none;
  color: inherit;
  transition: background-color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.meta-chip:hover,
.meta-chip:focus-visible {
  background: rgba(216, 169, 78, 0.14);
  border-color: var(--gold);
}

.meta-chip__label {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--gold);
}

.meta-chip__value {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--paper);
}

.masthead__notice {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
  padding-bottom: 0.15em;
  border-bottom: 1px solid var(--line-gold);
  font-family: var(--font-body);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-decoration: none;
  color: var(--paper);
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.masthead__notice:hover,
.masthead__notice:focus-visible {
  color: var(--gold);
  border-bottom-color: var(--gold);
}

.masthead__notice-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--poplar);
  box-shadow: 0 0 0 3px rgba(217, 118, 59, 0.18);
  flex: 0 0 auto;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.5em;
  padding: 0.45rem 0.7rem;
  border: 1px solid var(--line-gold);
  background: transparent;
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background-color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.nav-toggle:hover,
.nav-toggle:focus-visible {
  background: rgba(216, 169, 78, 0.14);
  border-color: var(--gold);
}

.nav-toggle__bars {
  display: grid;
  gap: 3px;
  width: 16px;
}

.nav-toggle__bars i {
  display: block;
  height: 1px;
  background: currentColor;
  transition: transform var(--t-mid) var(--ease), opacity var(--t-mid) var(--ease);
}

.nav-toggle[aria-expanded="true"] { border-color: var(--gold); color: var(--gold); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1) { transform: translateY(4px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(3) { transform: translateY(-4px) rotate(-45deg); }

.nav-toggle__text { line-height: 1; }

/* 导航 = 刻度条 */
.sitenav {
  margin-top: 0.5rem;
  border-top: 1px solid var(--line-light);
}

.sitenav__list {
  display: flex;
  margin: 0;
  padding: 0;
  list-style: none;
}

.sitenav__item {
  flex: 1 1 0;
  min-width: 0;
  border-left: 1px solid var(--line-light);
}

.sitenav__item:first-child { border-left: 0; }

.sitenav__link {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.2em;
  padding: 0.6rem 0.85rem 0.75rem;
  text-decoration: none;
  color: rgba(244, 235, 216, 0.82);
  font-family: var(--font-body);
  transition: color var(--t-fast) var(--ease), background-color var(--t-fast) var(--ease);
}

.sitenav__index {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  color: var(--slate);
  transition: color var(--t-fast) var(--ease);
}

.sitenav__label {
  font-size: 14px;
  letter-spacing: 0.08em;
  white-space: nowrap;
}

.sitenav__link::after {
  content: "";
  position: absolute;
  left: 0.85rem;
  right: 0.85rem;
  bottom: 0.4rem;
  height: 1px;
  background: var(--gold);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--t-mid) var(--ease);
}

.sitenav__link:hover,
.sitenav__link:focus-visible {
  color: var(--paper);
  background: rgba(216, 169, 78, 0.09);
}

.sitenav__link:hover::after,
.sitenav__link:focus-visible::after { transform: scaleX(1); }

.sitenav__link:hover .sitenav__index,
.sitenav__link:focus-visible .sitenav__index { color: var(--gold); }

.sitenav__link[aria-current="page"] {
  color: var(--gold);
  background: linear-gradient(180deg, rgba(216, 169, 78, 0.16), rgba(216, 169, 78, 0));
}

.sitenav__link[aria-current="page"]::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gold);
}

.sitenav__link[aria-current="page"]::after { transform: scaleX(1); }
.sitenav__link[aria-current="page"] .sitenav__index { color: var(--gold); }

/* 检索 = 坐标输入框 */
.searchfield {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto auto;
  align-items: center;
  gap: 0.75rem;
  padding-block: 0.5rem 0.15rem;
  border-top: 1px solid var(--line-light);
}

.searchfield__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--slate);
  white-space: nowrap;
}

.searchfield__input {
  width: 100%;
  padding: 0.5rem 0.75rem;
  background: var(--night-700);
  border: 1px solid rgba(159, 199, 201, 0.28);
  border-radius: 0;
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 14px;
  letter-spacing: 0.04em;
  transition: border-color var(--t-fast) var(--ease), box-shadow var(--t-fast) var(--ease);
  -webkit-appearance: none;
  appearance: none;
}

.searchfield__input::placeholder { color: rgba(159, 199, 201, 0.72); }

.searchfield__input:hover { border-color: rgba(159, 199, 201, 0.5); }

.searchfield__input:focus {
  outline: none;
  border-color: var(--gold);
  box-shadow: inset 0 0 0 1px rgba(216, 169, 78, 0.45);
}

.searchfield__status {
  min-width: 11em;
  margin: 0;
  text-align: right;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--slate);
}

.searchfield__status[data-state="hit"] { color: var(--ice); }
.searchfield__status[data-state="empty"] { color: var(--poplar); }

.searchfield__hint {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--gold);
  text-decoration: none;
  border-bottom: 1px solid var(--line-gold);
  white-space: nowrap;
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.searchfield__hint:hover,
.searchfield__hint:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--paper);
}

.masthead__progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 100%;
  height: 2px;
  background: var(--gold);
  transform: scaleX(0);
  transform-origin: left center;
  z-index: 2;
  pointer-events: none;
}

[data-search-item][hidden] { display: none !important; }

/* =========================================================
   页脚
   ========================================================= */
.colophon {
  position: relative;
  background: var(--night-900);
  color: var(--paper);
  border-top: 1px solid rgba(216, 169, 78, 0.32);
}

.colophon__scale {
  height: 26px;
  border-top: 1px solid var(--line-gold);
  background-image: repeating-linear-gradient(90deg, rgba(216, 169, 78, 0.5) 0 1px, transparent 1px 16px);
  background-size: 100% 9px;
  background-position: left bottom;
  background-repeat: no-repeat;
}

.colophon__inner { padding-block: clamp(2rem, 4vw, 3.5rem) clamp(1.25rem, 3vw, 2rem); }

.colophon__top {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1.5fr) minmax(0, 1.15fr);
  gap: clamp(1.5rem, 3vw, 3rem);
  padding-bottom: clamp(1.5rem, 3vw, 2.5rem);
  border-bottom: 1px solid var(--line-light);
}

.colophon__kicker {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--gold);
}

.colophon__wordmark {
  margin-top: 0.5rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.6rem, 3vw, 2.25rem);
  line-height: 1;
  letter-spacing: 0.02em;
}

.colophon__tagline {
  margin-top: 0.75rem;
  max-width: 26ch;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(244, 235, 216, 0.7);
}

.colophon__nav {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.5rem;
}

.colophon__coltitle {
  margin-bottom: 0.8rem;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--gold);
}

.colophon__list {
  display: grid;
  gap: 0.45rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.colophon__link {
  font-size: 14px;
  letter-spacing: 0.06em;
  text-decoration: none;
  color: rgba(244, 235, 216, 0.82);
  border-bottom: 1px solid transparent;
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.colophon__link:hover,
.colophon__link:focus-visible {
  color: var(--gold);
  border-bottom-color: var(--line-gold);
}

.contact-list {
  display: grid;
  gap: 0.55rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.contact-list__item {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.45rem;
  font-size: 13px;
}

.contact-list__label {
  min-width: 2.4em;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  color: var(--slate);
}

.contact-list__value {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.02em;
  line-height: 1.7;
  color: rgba(244, 235, 216, 0.92);
  overflow-wrap: anywhere;
}

.copybtn {
  padding: 0.1em 0.5em;
  border: 1px solid rgba(216, 169, 78, 0.42);
  background: transparent;
  color: var(--gold);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background-color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}

.copybtn:hover,
.copybtn:focus-visible {
  background: rgba(216, 169, 78, 0.16);
  border-color: var(--gold);
}

.copybtn[data-copy-state="done"] {
  color: var(--ice);
  border-color: rgba(159, 199, 201, 0.6);
}

.colophon__note {
  margin-top: 0.9rem;
  font-size: 12px;
  line-height: 1.8;
  color: rgba(244, 235, 216, 0.6);
}

.colophon__legal {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.6rem;
  padding-top: 1.25rem;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--slate);
}

.colophon__icp,
.colophon__copyright,
.colophon__hours { margin: 0; }

/* =========================================================
   响应式
   ========================================================= */
@media (max-width: 900px) {
  .grid--3 { grid-template-columns: minmax(0, 1fr); }
  .grid--split { grid-template-columns: minmax(0, 1fr); }
  .span-4,
  .span-5,
  .span-6,
  .span-7,
  .span-8 { grid-column: 1 / -1; }

  .colophon__top { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
  .colophon__contact { grid-column: 1 / -1; }
}

@media (max-width: 820px) {
  .masthead__inner { padding-block: 0.55rem 0.4rem; }

  .masthead__top {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 0.5rem;
  }

  .masthead__coordinate { display: none; }

  .masthead__brand {
    justify-items: start;
    text-align: left;
    padding: 0;
  }

  .masthead__title { font-size: 1.65rem; }
  .masthead__sub { display: none; }
  .masthead__kicker { letter-spacing: 0.22em; }

  .masthead__meta { gap: 0.45rem; }

  .masthead__notice { display: none; }

  .meta-chip { padding: 0.28rem 0.5rem; }
  .meta-chip__label { font-size: 8px; letter-spacing: 0.18em; }
  .meta-chip__value { font-size: 12px; }

  .nav-toggle { display: inline-flex; }

  .sitenav { display: none; margin-top: 0.4rem; }

  .sitenav[data-open] {
    display: block;
    animation: navdrop var(--t-mid) var(--ease) both;
  }

  .sitenav__list { flex-direction: column; }

  .sitenav__item {
    flex: 1 1 auto;
    border-left: 0;
    border-top: 1px solid var(--line-light);
  }

  .sitenav__item:first-child { border-top: 1px solid var(--line-light); }

  .sitenav__link {
    flex-direction: row;
    align-items: baseline;
    gap: 0.65rem;
    padding: 0.75rem 0.35rem;
  }

  .sitenav__label { font-size: 15px; white-space: normal; }

  .sitenav__link::after {
    left: 0;
    right: auto;
    width: 100%;
    bottom: 0.45rem;
  }

  .sitenav__link[aria-current="page"]::before { display: none; }

  .sitenav__link[aria-current="page"] {
    background: rgba(216, 169, 78, 0.12);
    padding-left: 0.6rem;
  }

  .searchfield {
    grid-template-columns: auto minmax(0, 1fr);
    row-gap: 0.35rem;
    padding-block: 0.45rem 0.2rem;
  }

  .searchfield__status {
    grid-column: 1 / -1;
    text-align: left;
    min-width: 0;
  }

  .searchfield__hint {
    grid-column: 1 / -1;
    justify-self: start;
  }
}

@keyframes navdrop {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 640px) {
  .grid--2 { grid-template-columns: minmax(0, 1fr); }

  .colophon__top { grid-template-columns: minmax(0, 1fr); }
  .colophon__nav { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .colophon__contact { grid-column: auto; }

  .colophon__legal {
    flex-direction: column;
    gap: 0.35rem;
  }

  .h-display { letter-spacing: -0.01em; }
}

/* =========================================================
   可访问性：降低动态
   ========================================================= */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }

  .masthead__progress { transition: none; }
  .sitenav[data-open] { animation: none; }
}