/* ============================================================
   澳博中心 · 呼号 URUZ —— 共享外壳样式表
   /assets/site.css
   夜间信号站控制台基调：深海墨蓝地表 + 冷银细界线 + 奶油纸阅读岛
   ============================================================ */

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

:root {
  /* 品牌色 */
  --ink-900: #071A2B;
  --ink-850: #04101A;
  --ink-800: #0E2A40;
  --ink-700: #123954;
  --silver: #C7D3DC;
  --mist: #E8EEF2;
  --cream: #F4EFE3;
  --signal: #FF6A3D;
  --cyan: #43F0D0;
  --brown: #2B2118;
  --steel: #2F4A57;

  /* 派生线与光 */
  --line: rgba(199, 211, 220, 0.16);
  --line-strong: rgba(199, 211, 220, 0.34);
  --line-cyan: rgba(67, 240, 208, 0.45);
  --halo-cyan: rgba(67, 240, 208, 0.10);
  --halo-signal: rgba(255, 106, 61, 0.12);
  --soft-text: rgba(199, 211, 220, 0.62);
  --faint-text: rgba(199, 211, 220, 0.42);

  /* 字体 */
  --font-display: "HarmonyOS Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-body: "PingFang SC", "HarmonyOS Sans SC", "Source Han Sans SC", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", "Cascadia Mono", "JetBrains Mono", Menlo, Consolas, "Courier New", monospace;

  /* 度量 */
  --shell-max: 1440px;
  --gutter: clamp(1rem, 3.4vw, 2.75rem);
  --radius: 3px;
  --shadow-soft: 0 1px 0 rgba(199, 211, 220, 0.06), 0 22px 50px -34px rgba(0, 0, 0, 0.92);
  --header-h: 150px;
}

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

body {
  margin: 0;
  min-height: 100%;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.75;
  color: var(--mist);
  background-color: var(--ink-900);
  background-image:
    radial-gradient(1100px 520px at 84% -10%, rgba(67, 240, 208, 0.07), transparent 62%),
    radial-gradient(860px 440px at 2% 4%, rgba(255, 106, 61, 0.055), transparent 58%),
    linear-gradient(rgba(199, 211, 220, 0.030) 1px, transparent 1px),
    linear-gradient(90deg, rgba(199, 211, 220, 0.030) 1px, transparent 1px);
  background-size: auto, auto, 96px 96px, 96px 96px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

ul, ol { margin: 0; padding: 0; }

p { margin: 0 0 1em; }
p:last-child { margin-bottom: 0; }

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: 0.05em;
  color: var(--mist);
}

h1 { font-size: clamp(2.1rem, 5vw, 4rem); letter-spacing: 0.08em; }
h2 { font-size: clamp(1.45rem, 2.8vw, 2.1rem); }
h3 { font-size: clamp(1.1rem, 1.7vw, 1.35rem); letter-spacing: 0.06em; }
h4 { font-size: 1rem; letter-spacing: 0.08em; }

a { color: inherit; text-decoration: none; }

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

:where(a, button, [tabindex]):focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 2px;
}

#main-content { scroll-margin-top: calc(var(--header-h) + 12px); }

/* ---------- 布局容器 ---------- */
.shell {
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(0.9rem, 1.7vw, 1.5rem);
}

/* ---------- 跳转链接 ---------- */
.skip-link {
  position: absolute;
  top: -120px;
  left: 1rem;
  z-index: 200;
  display: inline-block;
  padding: 0.7rem 1.1rem;
  background: var(--signal);
  color: #1B0C05;
  border-radius: 2px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  transition: top 0.2s ease;
}
.skip-link:focus,
.skip-link:focus-visible { top: 0.6rem; color: #1B0C05; }

/* ============================================================
   页头 —— 框架式导航
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background: rgba(4, 16, 26, 0.95);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
  color: var(--mist);
}

/* 顶部状态条 */
.frame-bar {
  background: var(--ink-850);
  border-bottom: 1px solid var(--line);
}
.frame-bar__inner {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 1rem;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding: 0.4rem var(--gutter);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--soft-text);
}
.frame-signal {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0;
  white-space: nowrap;
}
.frame-signal__dot {
  width: 6px;
  height: 6px;
  flex: none;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(67, 240, 208, 0.16);
  animation: signalPulse 2.8s ease-in-out infinite;
}
.frame-signal__code {
  color: var(--cyan);
  font-weight: 700;
  letter-spacing: 0.22em;
}
.frame-utility {
  margin: 0;
  text-align: center;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: var(--faint-text);
}
.frame-clock {
  margin: 0;
  justify-self: end;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  white-space: nowrap;
  color: var(--faint-text);
}
.frame-clock__value {
  color: var(--mist);
  letter-spacing: 0.1em;
  font-variant-numeric: tabular-nums;
}

@keyframes signalPulse {
  0%, 100% { opacity: 1; box-shadow: 0 0 0 3px rgba(67, 240, 208, 0.16); }
  50% { opacity: 0.5; box-shadow: 0 0 0 7px rgba(67, 240, 208, 0.03); }
}

/* 铭牌行 */
.masthead {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding: 0.8rem var(--gutter);
}
.masthead__side {
  display: flex;
  align-items: center;
  gap: 1rem;
}
.masthead__note {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--faint-text);
  white-space: nowrap;
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.8rem;
  color: var(--mist);
}
.brand:hover { color: var(--mist); }
.brand__mark {
  display: inline-flex;
  align-items: flex-end;
  gap: 2px;
  height: 26px;
  flex: none;
}
.brand__mark span {
  width: 3px;
  border-radius: 1px;
  background: var(--cyan);
  transform-origin: bottom center;
  animation: markPulse 2.6s ease-in-out infinite;
}
.brand__mark span:nth-child(1) { height: 38%; animation-delay: 0s; }
.brand__mark span:nth-child(2) { height: 66%; animation-delay: 0.18s; }
.brand__mark span:nth-child(3) { height: 100%; animation-delay: 0.36s; background: var(--signal); }
.brand__mark span:nth-child(4) { height: 58%; animation-delay: 0.54s; }
.brand__mark span:nth-child(5) { height: 26%; animation-delay: 0.72s; }
@keyframes markPulse {
  0%, 100% { opacity: 0.35; transform: scaleY(0.72); }
  50% { opacity: 1; transform: scaleY(1); }
}
.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.05;
}
.brand__name {
  font-family: var(--font-display);
  font-size: 1.22rem;
  font-weight: 800;
  letter-spacing: 0.16em;
  color: var(--mist);
}
.brand__sub {
  margin-top: 0.28rem;
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--cyan);
}

/* 移动导航按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.55rem;
  padding: 0.55rem 0.85rem;
  background: transparent;
  border: 1px solid var(--line-strong);
  border-radius: 2px;
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  cursor: pointer;
  transition: border-color 0.2s ease, color 0.2s ease;
}
.nav-toggle:hover { border-color: var(--cyan); color: var(--cyan); }
.nav-toggle__bars {
  position: relative;
  display: inline-block;
  width: 16px;
  height: 10px;
  flex: none;
}
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: 1px;
  background: currentColor;
  transition: transform 0.22s ease;
}
.nav-toggle__bars::before { top: 0; }
.nav-toggle__bars::after { bottom: 0; }
.site-header[data-open="true"] .nav-toggle__bars::before { transform: translateY(4.5px) rotate(45deg); }
.site-header[data-open="true"] .nav-toggle__bars::after { transform: translateY(-4.5px) rotate(-45deg); }

/* 六格导航巷 */
.site-nav {
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(14, 42, 64, 0.58), rgba(7, 26, 43, 0.18));
}
.site-nav__list {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  max-width: var(--shell-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
  list-style: none;
}
.site-nav__item {
  position: relative;
  border-left: 1px solid var(--line);
  min-width: 0;
}
.site-nav__item:last-child { border-right: 1px solid var(--line); }
.site-nav__link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.78rem 0.85rem;
  color: rgba(199, 211, 220, 0.72);
  box-shadow: inset 0 2px 0 transparent;
  transition: color 0.2s ease, background-color 0.2s ease, box-shadow 0.2s ease;
}
.site-nav__link:hover,
.site-nav__link:focus-visible {
  color: var(--cyan);
  background: rgba(67, 240, 208, 0.06);
  box-shadow: inset 0 2px 0 var(--cyan);
}
.site-nav__link[aria-current="page"] {
  color: var(--mist);
  background: rgba(67, 240, 208, 0.09);
  box-shadow: inset 0 2px 0 var(--cyan);
}
.site-nav__index {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.08em;
  color: var(--faint-text);
  transition: color 0.2s ease;
}
.site-nav__link:hover .site-nav__index,
.site-nav__link:focus-visible .site-nav__index,
.site-nav__link[aria-current="page"] .site-nav__index { color: var(--signal); }
.site-nav__label {
  font-family: var(--font-display);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* 滚动进度 */
.scroll-meter {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  overflow: hidden;
  pointer-events: none;
}
.scroll-meter__fill {
  display: block;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, var(--cyan), var(--signal));
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.12s linear;
}

@keyframes navDrop {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: none; }
}

/* ============================================================
   页脚 —— 沉降资料舱
   ============================================================ */
.site-footer {
  position: relative;
  margin-top: clamp(3rem, 7vw, 6rem);
  background: linear-gradient(180deg, #040E16, var(--ink-900) 58%);
  border-top: 1px solid var(--line);
  color: var(--mist);
  overflow: hidden;
}
.site-footer::before {
  content: "URUZ";
  position: absolute;
  right: -0.06em;
  bottom: -0.3em;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(7rem, 22vw, 20rem);
  letter-spacing: 0.06em;
  line-height: 0.8;
  color: rgba(199, 211, 220, 0.035);
  pointer-events: none;
  user-select: none;
}
.footer-frame {
  position: relative;
  z-index: 1;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding: clamp(2rem, 4vw, 3.4rem) var(--gutter) 1.4rem;
}
.footer-top {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 1.5fr) minmax(0, 1fr);
  gap: clamp(1.4rem, 3vw, 3rem);
  padding-bottom: clamp(1.6rem, 3vw, 2.4rem);
  border-bottom: 1px solid var(--line);
}

.footer-brand__call {
  margin: 0 0 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--cyan);
}
.footer-brand__line {
  margin: 0 0 0.7rem;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--mist);
}
.footer-brand__summary {
  margin: 0;
  max-width: 36ch;
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--soft-text);
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.5rem;
}
.footer-nav__group { min-width: 0; }
.footer-nav__title,
.footer-contact__title {
  margin: 0 0 0.85rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--signal);
}
.footer-nav__list {
  display: grid;
  gap: 0.5rem;
  list-style: none;
}
.footer-nav__list a {
  display: inline-block;
  padding: 0.1rem 0;
  font-size: 0.9375rem;
  color: rgba(232, 238, 242, 0.78);
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}
.footer-nav__list a:hover {
  color: var(--cyan);
  border-bottom-color: var(--line-cyan);
}

.footer-contact__list {
  display: grid;
  gap: 0.62rem;
  list-style: none;
}
.footer-contact__row {
  display: grid;
  grid-template-columns: 2.6rem minmax(0, 1fr);
  gap: 0.7rem;
  align-items: baseline;
}
.footer-contact__label {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--faint-text);
}
.footer-contact__value {
  font-size: 0.8125rem;
  line-height: 1.6;
  color: rgba(232, 238, 242, 0.82);
  word-break: break-word;
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem 1.4rem;
  padding-top: 1.2rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  color: var(--faint-text);
}
.footer-legal__copy { margin: 0; }
.footer-legal__icp { margin: 0; color: var(--soft-text); }
.footer-legal__links {
  display: flex;
  flex-wrap: wrap;
  gap: 1.1rem;
  list-style: none;
}
.footer-legal__links a {
  color: rgba(199, 211, 220, 0.72);
  padding-bottom: 1px;
  border-bottom: 1px solid var(--line);
  transition: color 0.2s ease, border-color 0.2s ease;
}
.footer-legal__links a:hover {
  color: var(--cyan);
  border-bottom-color: var(--line-cyan);
}

/* ============================================================
   通用组件
   ============================================================ */
.kicker {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin: 0 0 0.9rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
}
.kicker::before {
  content: "";
  width: 22px;
  height: 1px;
  flex: none;
  background: currentColor;
}
.kicker--signal { color: var(--signal); }

.section-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.35rem 1rem;
  align-items: baseline;
  padding-top: 1rem;
  margin-bottom: 1.5rem;
  border-top: 1px solid var(--line);
}
.section-head__index {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.18em;
  color: var(--signal);
}
.section-head__title {
  margin: 0;
  font-size: clamp(1.4rem, 2.6vw, 2rem);
}
.section-head__note {
  grid-column: 1 / -1;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--soft-text);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 0.85rem 1.35rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: rgba(199, 211, 220, 0.04);
  color: var(--mist);
  font-family: var(--font-display);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  line-height: 1.2;
  cursor: pointer;
  transition: border-color 0.2s ease, background-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
}
.btn:hover {
  border-color: var(--cyan);
  color: var(--cyan);
  background: rgba(67, 240, 208, 0.07);
}
.btn:active { transform: translateY(1px); }
.btn--signal {
  background: var(--signal);
  border-color: var(--signal);
  color: #200F08;
}
.btn--signal:hover {
  background: #FF835C;
  border-color: #FF835C;
  color: #1B0C05;
}
.btn--ghost { background: transparent; }
.btn--sm {
  padding: 0.55rem 0.9rem;
  font-size: 0.75rem;
  letter-spacing: 0.14em;
}
.btn__dot {
  width: 6px;
  height: 6px;
  flex: none;
  border-radius: 50%;
  background: currentColor;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.22rem 0.6rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--silver);
  white-space: nowrap;
}
.tag--cyan {
  color: var(--cyan);
  border-color: var(--line-cyan);
  background: var(--halo-cyan);
}
.tag--signal {
  color: var(--signal);
  border-color: rgba(255, 106, 61, 0.45);
  background: var(--halo-signal);
}

.panel {
  position: relative;
  padding: clamp(1.1rem, 2vw, 1.9rem);
  background: linear-gradient(180deg, rgba(14, 42, 64, 0.92), rgba(9, 31, 49, 0.92));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
  transition: border-color 0.22s ease, transform 0.22s ease;
}
.panel:hover { border-color: var(--line-cyan); }
.panel--quiet { background: rgba(14, 42, 64, 0.45); }
.panel--flat { box-shadow: none; }
.panel--signal { border-color: rgba(255, 106, 61, 0.4); }
.panel--paper {
  background: var(--cream);
  border-color: rgba(43, 33, 24, 0.18);
  color: var(--brown);
}
.panel--paper h1,
.panel--paper h2,
.panel--paper h3,
.panel--paper h4 { color: var(--brown); }
.panel--paper .muted { color: rgba(43, 33, 24, 0.66); }
.panel--paper .kicker { color: var(--brown); }
.panel--paper a { color: #8A2B12; border-bottom: 1px solid rgba(138, 43, 18, 0.3); }
.panel--paper a:hover { color: #B4391A; }

.breadcrumb {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--faint-text);
}
.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  list-style: none;
}
.breadcrumb li {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}
.breadcrumb li + li::before {
  content: "/";
  color: rgba(199, 211, 220, 0.28);
}
.breadcrumb a { color: inherit; }
.breadcrumb a:hover { color: var(--cyan); }
.breadcrumb [aria-current="page"] { color: var(--mist); }

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}
.filter-bar__btn {
  padding: 0.42rem 0.85rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: transparent;
  color: rgba(199, 211, 220, 0.72);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  cursor: pointer;
  transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}
.filter-bar__btn:hover {
  color: var(--cyan);
  border-color: var(--line-cyan);
}
.filter-bar__btn[aria-pressed="true"],
.filter-bar__btn[data-active="true"] {
  color: var(--cyan);
  border-color: var(--line-cyan);
  background: var(--halo-cyan);
}

/* 图像容器基线（页面阶段放入 img / picture） */
.media-frame {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  isolation: isolate;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--ink-800);
  background-image:
    repeating-linear-gradient(135deg, rgba(199, 211, 220, 0.055) 0 1px, transparent 1px 10px),
    radial-gradient(120% 90% at 18% 0%, rgba(67, 240, 208, 0.10), transparent 62%),
    linear-gradient(180deg, var(--ink-800), var(--ink-900));
}
.media-frame > img,
.media-frame > picture > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  border: 1px solid rgba(199, 211, 220, 0.08);
  box-shadow: inset 0 70px 70px -60px rgba(0, 0, 0, 0.9);
  pointer-events: none;
}
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--cream {
  background-color: var(--cream);
  background-image: repeating-linear-gradient(135deg, rgba(43, 33, 24, 0.08) 0 1px, transparent 1px 10px);
}
.media-frame__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 2;
  padding: 0.6rem 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--silver);
  background: linear-gradient(0deg, rgba(4, 16, 26, 0.92), transparent);
}

.mono {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.muted { color: var(--soft-text); }
.rule {
  height: 0;
  margin: clamp(1.6rem, 3vw, 2.6rem) 0;
  border: 0;
  border-top: 1px solid var(--line);
}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1180px) {
  .site-nav__label { font-size: 0.78rem; letter-spacing: 0.08em; }
  .site-nav__link { padding: 0.75rem 0.6rem; }
}

@media (max-width: 980px) {
  :root { --header-h: 108px; }

  .frame-bar__inner {
    grid-template-columns: auto 1fr;
    gap: 0.6rem;
    padding-block: 0.35rem;
    font-size: 0.625rem;
    letter-spacing: 0.12em;
  }
  .frame-utility { display: none; }
  .masthead__note { display: none; }

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

  .site-nav { display: none; }
  .site-header[data-open="true"] .site-nav {
    display: block;
    animation: navDrop 0.24s ease both;
  }
  .site-nav__list {
    grid-template-columns: minmax(0, 1fr);
    padding-inline: 0;
    border-top: 1px solid var(--line);
  }
  .site-nav__item {
    border-left: 0;
    border-top: 1px solid var(--line);
  }
  .site-nav__item:first-child { border-top: 0; }
  .site-nav__item:last-child { border-right: 0; }
  .site-nav__link {
    justify-content: space-between;
    padding: 0.95rem var(--gutter);
    font-size: 0.9rem;
  }
  .site-nav__label { font-size: 0.9375rem; letter-spacing: 0.14em; }
  .site-nav__index { order: 2; font-size: 0.6875rem; }

  .footer-top { grid-template-columns: minmax(0, 1fr); }
  .footer-nav { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 900px) {
  .grid-12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
}

@media (max-width: 640px) {
  body { font-size: 0.9688rem; }
  .brand__name { font-size: 1.06rem; letter-spacing: 0.12em; }
  .brand__sub { font-size: 0.5625rem; letter-spacing: 0.22em; }
  .grid-12 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-nav { grid-template-columns: minmax(0, 1fr); }
  .footer-legal {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.6rem;
  }
  .footer-legal__links { gap: 0.85rem; }
}

@media (max-width: 420px) {
  .frame-clock { display: none; }
  .frame-bar__inner { grid-template-columns: minmax(0, 1fr); }
  .btn { width: 100%; }
}

@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;
  }
  .scroll-meter__fill { transition: none !important; }
}