/* =========================================================
   伟德中心 · 共享样式表 /assets/site.css
   夜间故障排查台视觉系统：深海蓝底 / 堆叠面板 / 信号橙状态
   ========================================================= */

/* ---------- 1. Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 120px;
}

body {
  margin: 0;
  min-height: 100vh;
  overflow-x: hidden;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: .01em;
  color: var(--c-body);
  background-color: var(--c-deep);
  background-image:
    radial-gradient(900px 520px at 12% -10%, rgba(255, 122, 26, .09), transparent 62%),
    radial-gradient(760px 480px at 92% 4%, rgba(74, 109, 140, .20), transparent 66%),
    linear-gradient(180deg, #0B1F33 0%, #0A1A2B 44%, #05080D 100%);
  background-attachment: fixed;
  background-repeat: no-repeat;
}

h1, h2, h3, h4, h5, h6, p, figure, blockquote, dl, dd { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
img, svg, video { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; }
[hidden] { display: none !important; }

/* ---------- 2. Tokens ---------- */
:root {
  /* 品牌色 */
  --c-deep: #0B1F33;
  --c-night: #05080D;
  --c-panel: #12293F;
  --c-signal: #FF7A1A;
  --c-signal-soft: #FFC08A;
  --c-slate: #4A6D8C;
  --c-mist: #9FB8CC;
  --c-paper: #EDF3F8;
  --c-green: #3FBF8F;
  --c-amber: #E0A93B;

  /* 语义色 */
  --c-title: #EDF3F8;
  --c-body: #C6D8E6;
  --c-meta: #9FB8CC;
  --c-line: rgba(74, 109, 140, .34);
  --c-line-strong: rgba(74, 109, 140, .62);
  --c-surface: rgba(18, 41, 63, .62);

  /* 字体 */
  --font-display: "Helvetica Neue", "Arial Narrow", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, "Liberation Mono", "Courier New", monospace;

  /* 尺寸 */
  --shell: 1180px;
  --gutter: clamp(16px, 4vw, 40px);
  --r-xs: 8px;
  --r-sm: 12px;
  --r-md: 18px;
  --r-lg: 28px;
  --r-xl: 40px;
  --r-pill: 999px;

  /* 动效 */
  --ease: cubic-bezier(.22, .61, .36, 1);
  --t-fast: 180ms;
  --t-mid: 260ms;
  --t-slow: 320ms;

  --shadow-panel: 0 26px 62px -44px rgba(0, 0, 0, .95);
}

/* ---------- 3. 排版 ---------- */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  font-stretch: 87.5%;
  letter-spacing: -.02em;
  line-height: 1.14;
  color: var(--c-title);
}
h1 { font-size: clamp(34px, 5.4vw, 64px); }
h2 { font-size: clamp(26px, 3.6vw, 42px); }
h3 { font-size: clamp(19px, 2.2vw, 26px); }
h4 { font-size: 18px; letter-spacing: -.005em; }
p { max-width: 74ch; }
strong { color: var(--c-paper); }
code, kbd, samp { font-family: var(--font-mono); font-size: .92em; }

:focus-visible {
  outline: 2px solid var(--c-signal-soft);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- 4. 布局工具 ---------- */
.shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.page-top { padding-top: clamp(122px, 17vh, 172px); }

.section { padding-block: clamp(48px, 7vw, 96px); }

.section__head {
  display: grid;
  gap: 12px;
  max-width: 780px;
  margin-bottom: clamp(24px, 3vw, 40px);
}
.section__lede { font-size: 17px; color: var(--c-meta); max-width: 62ch; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--c-signal-soft);
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: currentColor;
  opacity: .75;
}

.stack > * + * { margin-top: var(--stack-gap, 16px); }
.stack--lg { --stack-gap: 28px; }

.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;
}

.grid { display: grid; gap: clamp(14px, 2vw, 22px); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid--split { grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr); }

/* ---------- 5. 面板与卡片 ---------- */
.panel {
  position: relative;
  padding: clamp(20px, 3vw, 32px);
  border: 1px solid var(--c-line);
  border-radius: var(--r-lg);
  background: linear-gradient(168deg, rgba(18, 41, 63, .92), rgba(11, 31, 51, .84));
  box-shadow: var(--shadow-panel);
  transition: border-color var(--t-mid) var(--ease), transform var(--t-mid) var(--ease), background-color var(--t-mid) var(--ease);
}
.panel::before {
  content: "";
  position: absolute;
  top: 0; left: clamp(20px, 3vw, 32px);
  width: 34px; height: 2px;
  border-radius: 0 0 3px 3px;
  background: var(--c-signal);
  opacity: .85;
}
.panel:hover {
  border-color: rgba(255, 122, 26, .5);
  transform: translateY(-2px);
}
.panel--flat { background: var(--c-surface); box-shadow: none; }
.panel--deep { background: linear-gradient(180deg, #0A1B2C, #05080D); }

.panel__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px 16px;
  margin-bottom: 14px;
}
.panel__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-stretch: 87.5%;
  letter-spacing: -.015em;
  font-size: clamp(18px, 2vw, 23px);
  color: var(--c-title);
}
.panel__meta {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--c-meta);
}

/* ---------- 6. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border: 1px solid transparent;
  border-radius: var(--r-pill);
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 600;
  line-height: 1;
  text-align: center;
  cursor: pointer;
  transition: background-color var(--t-fast) var(--ease), color var(--t-fast) var(--ease),
              border-color var(--t-fast) var(--ease), transform var(--t-fast) var(--ease),
              box-shadow var(--t-fast) var(--ease);
}
.btn--signal {
  background: var(--c-signal);
  color: #0B1220;
  box-shadow: 0 14px 34px -20px rgba(255, 122, 26, .95);
}
.btn--signal:hover { background: var(--c-signal-soft); transform: translateY(-1px); }
.btn--ghost {
  background: transparent;
  border-color: var(--c-line-strong);
  color: var(--c-paper);
}
.btn--ghost:hover { border-color: var(--c-signal); color: var(--c-signal-soft); }
.btn--sm { padding: 9px 17px; font-size: 13.5px; }
.btn--block { width: 100%; }

/* ---------- 7. 胶囊标签 / 状态点 ---------- */
.chip-row { display: flex; flex-wrap: wrap; gap: 8px; }

.chip,
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 13px;
  border: 1px solid var(--c-line);
  border-radius: var(--r-pill);
  background: rgba(74, 109, 140, .16);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  line-height: 1.6;
  color: var(--c-mist);
  white-space: nowrap;
  transition: border-color var(--t-fast) var(--ease), color var(--t-fast) var(--ease),
              background-color var(--t-fast) var(--ease);
}
button.chip { cursor: pointer; }
.chip:hover,
.tag:hover { border-color: var(--c-signal); color: var(--c-signal-soft); }
.chip.is-active,
.chip[aria-pressed="true"] {
  background: var(--c-signal);
  border-color: var(--c-signal);
  color: #0B1220;
  font-weight: 600;
}

.dot {
  display: inline-block;
  flex: none;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--c-slate);
  box-shadow: 0 0 0 3px rgba(74, 109, 140, .18);
}
.dot--live { background: var(--c-signal); box-shadow: 0 0 0 3px rgba(255, 122, 26, .2); animation: dotPulse 2.4s var(--ease) infinite; }
.dot--fixed { background: var(--c-green); box-shadow: 0 0 0 3px rgba(63, 191, 143, .2); }
.dot--pending { background: var(--c-amber); box-shadow: 0 0 0 3px rgba(224, 169, 59, .2); }

@keyframes dotPulse {
  0%, 100% { opacity: 1; box-shadow: 0 0 0 0 rgba(255, 122, 26, .55); }
  50% { opacity: .72; box-shadow: 0 0 0 7px rgba(255, 122, 26, 0); }
}

/* ---------- 8. 记录清单 ---------- */
.log-list { display: grid; gap: 12px; }

.log-item {
  display: grid;
  gap: 8px;
  padding: 18px clamp(16px, 2.4vw, 24px);
  border: 1px solid var(--c-line);
  border-left: 2px solid rgba(74, 109, 140, .55);
  border-radius: var(--r-md);
  background: rgba(18, 41, 63, .55);
  transition: border-color var(--t-mid) var(--ease), border-left-color var(--t-mid) var(--ease),
              background-color var(--t-mid) var(--ease), transform var(--t-mid) var(--ease);
}
.log-item:hover {
  border-color: rgba(255, 122, 26, .5);
  border-left-color: var(--c-signal);
  background: rgba(18, 41, 63, .88);
  transform: translateY(-2px);
}
.log-item__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 12px;
}
.log-item__id {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .07em;
  color: var(--c-meta);
}
.log-item__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-stretch: 88%;
  font-size: 18px;
  letter-spacing: -.01em;
  color: var(--c-title);
}
.log-item__body {
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  font-size: 15px;
  line-height: 1.7;
  color: var(--c-body);
}

/* ---------- 9. 数据 / 进度 / 提示 ---------- */
.stat { display: grid; gap: 6px; }
.stat__value {
  font-family: var(--font-display);
  font-weight: 800;
  font-stretch: 87.5%;
  font-size: clamp(34px, 5vw, 72px);
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--c-paper);
}
.stat__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--c-meta);
}

.meter {
  --meter-fill: 0%;
  position: relative;
  display: grid;
  place-items: center;
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: conic-gradient(var(--c-signal) var(--meter-fill), rgba(74, 109, 140, .26) 0);
  transition: background var(--t-slow) var(--ease);
}
.meter::after {
  content: "";
  position: absolute;
  inset: 6px;
  border-radius: 50%;
  background: var(--c-panel);
}
.meter__value {
  position: relative;
  z-index: 1;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--c-paper);
}

.callout {
  padding: 16px 18px;
  border: 1px solid var(--c-line);
  border-left: 3px solid var(--c-signal);
  border-radius: var(--r-md);
  background: rgba(18, 41, 63, .6);
  font-size: 15px;
  color: var(--c-body);
}
.callout--ok { border-left-color: var(--c-green); }
.callout--warn { border-left-color: var(--c-amber); }

/* ---------- 10. 面包屑 / 索引侧栏 / 长文 ---------- */
.crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .05em;
  color: var(--c-meta);
}
.crumbs a { transition: color var(--t-fast) var(--ease); }
.crumbs a:hover { color: var(--c-signal-soft); }
.crumbs__sep { opacity: .5; }

.rail { display: grid; gap: 2px; }
.rail__link {
  display: block;
  padding: 9px 12px;
  border-left: 2px solid rgba(74, 109, 140, .3);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .05em;
  color: var(--c-meta);
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease),
              background-color var(--t-fast) var(--ease), padding-left var(--t-fast) var(--ease);
}
.rail__link:hover { color: var(--c-paper); border-left-color: var(--c-slate); padding-left: 16px; }
.rail__link.is-active {
  color: var(--c-paper);
  border-left-color: var(--c-signal);
  background: linear-gradient(90deg, rgba(255, 122, 26, .16), transparent 78%);
}

.prose { max-width: 70ch; font-size: 16.5px; color: var(--c-body); }
.prose p { margin-bottom: 1.1em; }
.prose h2, .prose h3 { margin: 1.7em 0 .6em; }
.prose ul, .prose ol { margin-bottom: 1.2em; }
.prose li { position: relative; margin-bottom: .6em; padding-left: 22px; }
.prose li::before {
  content: "";
  position: absolute;
  left: 4px; top: .74em;
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--c-slate);
}
.prose a { color: var(--c-signal-soft); text-decoration: underline; text-underline-offset: 3px; }

/* ---------- 11. 图片容器基础规则 ---------- */
.figure { display: grid; gap: 10px; }
.figure__frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--c-line);
  border-radius: var(--r-lg);
  background: linear-gradient(160deg, #12293F 0%, #0B1F33 54%, #05080D 100%);
  aspect-ratio: 16 / 10;
}
.figure__frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(74, 109, 140, .16) 1px, transparent 1px),
    linear-gradient(90deg, rgba(74, 109, 140, .16) 1px, transparent 1px);
  background-size: 34px 34px;
  opacity: .7;
}
.figure__frame > img,
.figure__frame > svg,
.figure__frame > picture > img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.figure__ph {
  position: absolute;
  inset: 0;
  z-index: 1;
  display: grid;
  place-items: center;
  padding: 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  text-align: center;
  text-transform: uppercase;
  color: rgba(159, 184, 204, .72);
}
.figure__caption {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--c-meta);
}
.figure--wide .figure__frame { aspect-ratio: 21 / 9; }
.figure--tall .figure__frame { aspect-ratio: 4 / 5; }
.figure--square .figure__frame { aspect-ratio: 1 / 1; }

/* ---------- 12. 显现动效 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity var(--t-slow) var(--ease), transform var(--t-slow) var(--ease);
}
[data-reveal].is-visible { opacity: 1; transform: none; }

/* ---------- 13. 头部 ---------- */
.skip-link {
  position: absolute;
  top: 8px;
  left: var(--gutter);
  z-index: 120;
  padding: 10px 18px;
  border-radius: var(--r-pill);
  background: var(--c-signal);
  color: #0B1220;
  font-size: 14px;
  font-weight: 700;
  transform: translateY(-220%);
  transition: transform var(--t-fast) var(--ease);
}
.skip-link:focus { transform: none; }

.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 90;
  color: var(--c-paper);
  background: transparent;
  transition: background-color var(--t-mid) var(--ease), box-shadow var(--t-mid) var(--ease);
}
.site-header[data-scrolled="true"] {
  background: rgba(6, 16, 28, .95);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 rgba(74, 109, 140, .36), 0 24px 48px -36px rgba(0, 0, 0, .95);
}

.status-strip {
  border-bottom: 1px solid rgba(74, 109, 140, .22);
  background: linear-gradient(90deg, rgba(5, 8, 13, .88), rgba(11, 31, 51, .55));
}
.status-strip__inner {
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 38px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--c-meta);
}
.status-strip__dot {
  flex: none;
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--c-signal);
  animation: dotPulse 2.4s var(--ease) infinite;
}
.status-strip__text {
  margin: 0;
  max-width: none;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}
.status-strip__mono { margin-left: auto; white-space: nowrap; color: var(--c-signal-soft); }

.site-header__inner {
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 28px);
  padding-block: 16px;
  transition: padding var(--t-mid) var(--ease);
}
.site-header[data-scrolled="true"] .site-header__inner { padding-block: 9px; }

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  flex: none;
  min-width: 0;
}
.brand__mark {
  position: relative;
  flex: none;
  display: block;
  width: 34px; height: 34px;
  border: 1px solid rgba(74, 109, 140, .55);
  border-radius: 11px;
  background: linear-gradient(150deg, #16324B, #0A1B2C);
}
.brand__mark::before {
  content: "";
  position: absolute;
  inset: 8px;
  border: 1.5px solid rgba(255, 122, 26, .55);
  border-radius: 50%;
}
.brand__mark::after {
  content: "";
  position: absolute;
  top: 50%; left: 50%;
  width: 7px; height: 7px;
  margin: -3.5px 0 0 -3.5px;
  border-radius: 50%;
  background: var(--c-signal);
  box-shadow: 0 0 12px rgba(255, 122, 26, .9);
}
.brand__text { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.brand__name {
  font-family: var(--font-display);
  font-weight: 800;
  font-stretch: 88%;
  font-size: 18px;
  line-height: 1.2;
  letter-spacing: -.01em;
  color: var(--c-paper);
}
.brand__tag {
  max-width: 36ch;
  overflow: hidden;
  font-family: var(--font-mono);
  font-size: 10.5px;
  line-height: 1.3;
  letter-spacing: .06em;
  color: var(--c-mist);
  white-space: nowrap;
  text-overflow: ellipsis;
}

.primary-nav { display: flex; align-items: center; margin-inline: auto; }
.primary-nav__list { display: flex; align-items: center; gap: clamp(2px, .6vw, 10px); }
.primary-nav__link {
  position: relative;
  display: inline-block;
  padding: 9px 12px;
  border-radius: var(--r-pill);
  font-size: 14.5px;
  font-weight: 600;
  color: var(--c-mist);
  transition: color var(--t-fast) var(--ease), background-color var(--t-fast) var(--ease);
}
.primary-nav__link:hover { color: var(--c-paper); background: rgba(74, 109, 140, .22); }
.primary-nav__link[aria-current="page"] { color: var(--c-paper); background: rgba(255, 122, 26, .15); }
.primary-nav__link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 50%; bottom: 2px;
  width: 16px; height: 2px;
  margin-left: -8px;
  border-radius: 2px;
  background: var(--c-signal);
}
.primary-nav__foot { display: none; }

.header-actions { display: flex; align-items: center; gap: 10px; flex: none; }

.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 44px; height: 44px;
  padding: 0;
  border: 1px solid var(--c-line);
  border-radius: var(--r-sm);
  background: rgba(74, 109, 140, .18);
  cursor: pointer;
  transition: border-color var(--t-fast) var(--ease), background-color var(--t-fast) var(--ease);
}
.nav-toggle:hover { border-color: var(--c-signal); background: rgba(255, 122, 26, .14); }
.nav-toggle__box { position: relative; display: block; width: 18px; height: 14px; }
.nav-toggle__bar {
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  border-radius: 2px;
  background: var(--c-paper);
  transition: transform var(--t-mid) var(--ease), opacity var(--t-fast) var(--ease);
}
.nav-toggle__bar:nth-child(1) { top: 0; }
.nav-toggle__bar:nth-child(2) { top: 6px; }
.nav-toggle__bar:nth-child(3) { top: 12px; }
[data-open="true"] .nav-toggle__bar:nth-child(1) { transform: translateY(6px) rotate(45deg); }
[data-open="true"] .nav-toggle__bar:nth-child(2) { opacity: 0; }
[data-open="true"] .nav-toggle__bar:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

.read-progress {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 2px;
  overflow: hidden;
  background: rgba(74, 109, 140, .16);
  opacity: 0;
  transition: opacity var(--t-mid) var(--ease);
}
.site-header[data-scrolled="true"] .read-progress { opacity: 1; }
.read-progress__bar {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--c-signal), var(--c-signal-soft));
  transition: width 120ms linear;
}

/* ---------- 14. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(56px, 9vw, 120px);
  padding-top: clamp(40px, 6vw, 72px);
  border-top: 1px solid rgba(74, 109, 140, .3);
  border-radius: clamp(24px, 3.4vw, 44px) clamp(24px, 3.4vw, 44px) 0 0;
  background: linear-gradient(180deg, #060A11, #020407);
  color: var(--c-mist);
}

.footer__shell {
  display: grid;
  grid-template-columns: 1.5fr .85fr .85fr 1.25fr;
  gap: clamp(22px, 3vw, 44px);
  padding-bottom: clamp(28px, 4vw, 48px);
}

.footer__brand { display: flex; flex-direction: column; align-items: flex-start; gap: 14px; }
.brand--footer .brand__mark { width: 32px; height: 32px; }
.footer__note { max-width: 34ch; font-size: 14.5px; color: var(--c-body); }
.footer__status {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .05em;
  color: var(--c-meta);
}

.footer__title {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--c-signal-soft);
}
.footer__links { display: grid; gap: 9px; }
.footer__link {
  position: relative;
  display: inline-block;
  padding-left: 0;
  font-size: 15px;
  color: var(--c-mist);
  transition: color var(--t-fast) var(--ease), padding-left var(--t-fast) var(--ease);
}
.footer__link::before {
  content: "";
  position: absolute;
  top: 50%; left: 0;
  width: 0;
  height: 1px;
  background: var(--c-signal);
  transition: width var(--t-fast) var(--ease);
}
.footer__link:hover { padding-left: 14px; color: var(--c-paper); }
.footer__link:hover::before { width: 9px; }

.contact-list { display: grid; gap: 10px; }
.contact-line { display: grid; grid-template-columns: 58px minmax(0, 1fr); gap: 10px; align-items: start; }
.contact-line dt {
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .05em;
  color: var(--c-slate);
}
.contact-line dd { font-size: 14.5px; color: var(--c-paper); word-break: break-word; }
.contact-note { max-width: 40ch; margin-top: 14px; font-size: 13px; line-height: 1.7; color: var(--c-meta); }

.footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 22px;
  padding-block: 20px 26px;
  border-top: 1px solid rgba(74, 109, 140, .26);
  font-size: 13px;
  color: var(--c-meta);
}
.footer__legal { font-family: var(--font-mono); font-size: 12px; letter-spacing: .05em; }
.footer__copy { font-size: 13px; }

.to-top {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
  padding: 9px 16px;
  border: 1px solid var(--c-line-strong);
  border-radius: var(--r-pill);
  font-size: 13px;
  font-weight: 600;
  color: var(--c-paper);
  cursor: pointer;
  transition: border-color var(--t-fast) var(--ease), color var(--t-fast) var(--ease),
              background-color var(--t-fast) var(--ease);
}
.to-top:hover { border-color: var(--c-signal); color: var(--c-signal-soft); background: rgba(255, 122, 26, .1); }
.to-top__arrow {
  width: 8px; height: 8px;
  margin-top: 3px;
  border-top: 2px solid currentColor;
  border-left: 2px solid currentColor;
  transform: rotate(45deg);
}

/* ---------- 15. 响应式 ---------- */
@media (max-width: 1080px) {
  .footer__shell { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer__brand { grid-column: 1 / -1; }
}

@media (max-width: 980px) {
  .nav-toggle { display: inline-flex; }
  .header-actions__cta { display: none; }

  .primary-nav {
    position: absolute;
    top: 100%; left: 0; right: 0;
    display: block;
    margin: 0;
    max-height: calc(100vh - 96px);
    overflow-y: auto;
    padding: 14px var(--gutter) 22px;
    border-top: 1px solid var(--c-line);
    border-bottom: 1px solid var(--c-line);
    background: linear-gradient(180deg, rgba(8, 20, 33, .99), rgba(5, 8, 13, .99));
    box-shadow: 0 30px 60px -30px rgba(0, 0, 0, .95);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity var(--t-mid) var(--ease), transform var(--t-mid) var(--ease), visibility var(--t-mid);
  }
  [data-open="true"] .primary-nav { opacity: 1; visibility: visible; transform: none; }

  .primary-nav__list { flex-direction: column; align-items: stretch; gap: 2px; }
  .primary-nav__link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 13px 14px;
    border-bottom: 1px solid rgba(74, 109, 140, .18);
    border-radius: var(--r-sm);
    font-size: 16px;
  }
  .primary-nav__link[aria-current="page"] { background: rgba(255, 122, 26, .16); }
  .primary-nav__link[aria-current="page"]::after { display: none; }
  .primary-nav__foot { display: block; margin-top: 18px; }
  .primary-nav__foot p {
    margin-bottom: 10px;
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: .06em;
    color: var(--c-meta);
  }

  html.is-nav-open,
  html.is-nav-open body { overflow: hidden; }
}

@media (max-width: 900px) {
  .grid--2, .grid--3, .grid--4, .grid--split { grid-template-columns: minmax(0, 1fr); }
  .status-strip__mono { display: none; }
}

@media (max-width: 720px) {
  .grid--2.grid--keep, .grid--3.grid--keep { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .brand__tag { display: none; }
  .brand__name { font-size: 17px; }
  .status-strip__inner { min-height: 34px; font-size: 11px; }
  .site-header__inner { padding-block: 12px; }
  .site-header[data-scrolled="true"] .site-header__inner { padding-block: 8px; }
  .figure--wide .figure__frame { aspect-ratio: 16 / 10; }
}

@media (max-width: 640px) {
  .footer__shell { grid-template-columns: minmax(0, 1fr); }
  .footer__bottom { gap: 10px 18px; }
  .to-top { margin-left: 0; }
  .meter { width: 56px; height: 56px; }
}

/* ---------- 16. 降低动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  [data-reveal] { opacity: 1; transform: none; }
  .read-progress__bar { transition: none; }
}