/* ============================================================
   摩斯国际主站 · 共享样式 /assets/site.css
   暗夜科技 × 运动脉冲
   ============================================================ */

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

html, body, h1, h2, h3, h4, h5, h6, p, ul, ol, li, dl, dd, dt,
figure, blockquote, pre, table { margin: 0; padding: 0; }

ul, ol { list-style: none; }
img, svg, video { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
table { border-collapse: collapse; }
input, textarea { font: inherit; }
[hidden] { display: none !important; }

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

/* ---------- tokens ---------- */
:root {
  --void-indigo: #070A18;
  --deep-indigo: #131A3A;
  --glass-indigo: rgba(21, 29, 64, 0.62);
  --signal-cyan: #35E6D2;
  --cyan-deep: #12897F;
  --pulse-orange: #FF7A2F;
  --neon-violet: #A66BFF;
  --paper-white: #F2F5FF;
  --slate-mute: #9AA6C8;
  --hairline: #2A3358;
  --mint-ok: #3ED598;
  --alert-rose: #FF5D7A;

  --font-display: "Sora", "Archivo", "Noto Sans SC", system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", "IBM Plex Sans", system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, "Liberation Mono", monospace;

  --max-width: 1280px;
  --gutter: 24px;
  --header-h: 64px;
  --header-h-scrolled: 48px;

  --radius: 2px;
  --ease: cubic-bezier(.22, .61, .36, 1);
}

/* ---------- base ---------- */
body {
  background-color: var(--void-indigo);
  background-image:
    radial-gradient(90% 60% at 8% -6%, rgba(53, 230, 210, .07), transparent 60%),
    radial-gradient(70% 50% at 100% 4%, rgba(166, 107, 255, .08), transparent 62%);
  background-repeat: no-repeat;
  color: var(--paper-white);
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: .01em;
  min-height: 100vh;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.14;
  color: var(--paper-white);
}

strong, b { font-weight: 700; color: var(--paper-white); }
em { font-style: normal; color: var(--signal-cyan); }
code, kbd, samp { font-family: var(--font-mono); font-size: .92em; }

::selection { background: var(--signal-cyan); color: var(--void-indigo); }

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

/* ---------- skip link ---------- */
.skip-link {
  position: absolute;
  top: -72px;
  left: 16px;
  z-index: 200;
  padding: 10px 18px;
  background: var(--signal-cyan);
  color: var(--void-indigo);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .04em;
  transition: top .2s var(--ease);
}
.skip-link:focus { top: 12px; }

/* ---------- layout ---------- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

.section { padding: 96px 0; }
.section--tight { padding: 64px 0; }

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gutter);
}

.col-4 { grid-column: span 4; }
.col-5 { grid-column: span 5; }
.col-6 { grid-column: span 6; }
.col-7 { grid-column: span 7; }
.col-8 { grid-column: span 8; }
.col-12 { grid-column: span 12; }

.breath { grid-column: span 1; }

.diagonal-divider {
  height: 72px;
  margin: 64px 0;
  background: linear-gradient(90deg,
      transparent 0%,
      rgba(53, 230, 210, .18) 42%,
      rgba(166, 107, 255, .20) 58%,
      transparent 100%);
  clip-path: polygon(0 66%, 100% 0, 100% 32%, 0 100%);
  opacity: .9;
}

/* ---------- typography blocks ---------- */
.display-1 {
  font-family: var(--font-display);
  font-size: clamp(56px, 11vw, 144px);
  font-weight: 900;
  line-height: .92;
  letter-spacing: -0.035em;
  color: var(--paper-white);
}

.display-2 {
  font-family: var(--font-display);
  font-size: clamp(34px, 5.2vw, 64px);
  font-weight: 800;
  line-height: 1.06;
  letter-spacing: -0.03em;
}

.display-3 {
  font-family: var(--font-display);
  font-size: clamp(22px, 2.6vw, 28px);
  font-weight: 700;
  line-height: 1.22;
  letter-spacing: -0.015em;
}

.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--signal-cyan);
}

.lede {
  max-width: 34em;
  font-size: 20px;
  line-height: 1.7;
  color: var(--slate-mute);
}

.prose {
  max-width: 34em;
  font-size: 16px;
  line-height: 1.75;
  color: var(--slate-mute);
}
.prose p + p { margin-top: 1.1em; }
.prose h3 { margin-top: 2em; margin-bottom: .6em; color: var(--paper-white); }
.prose ul { margin: 1em 0; }
.prose li {
  position: relative;
  padding-left: 1.4em;
  margin-top: .5em;
}
.prose li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 10px;
  height: 2px;
  background: var(--signal-cyan);
}
.prose a {
  color: var(--signal-cyan);
  border-bottom: 1px solid rgba(53, 230, 210, .45);
}

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 16px;
  margin-bottom: 40px;
}

/* ---------- exhibit label ---------- */
.exhibit-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 11px;
  border: 2px solid var(--hairline);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  line-height: 1;
  letter-spacing: .08em;
  color: var(--slate-mute);
  background: rgba(7, 10, 24, .55);
  transition: border-color .25s var(--ease), color .25s var(--ease);
}
.exhibit-label::before {
  content: attr(data-index);
  font-size: 11px;
  color: var(--signal-cyan);
  letter-spacing: .06em;
}
.exhibit-label:hover { border-color: var(--signal-cyan); color: var(--paper-white); }

.exhibit-label--violet { color: var(--neon-violet); border-color: rgba(166, 107, 255, .42); }
.exhibit-label--violet::before { color: var(--neon-violet); }

.exhibit-label--orange { color: var(--pulse-orange); border-color: rgba(255, 122, 47, .42); }
.exhibit-label--orange::before { color: var(--pulse-orange); }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--paper-white);
  background: transparent;
  transition: background-color .22s var(--ease), border-color .22s var(--ease), color .22s var(--ease), transform .22s var(--ease);
}
.btn:hover { border-color: var(--signal-cyan); color: var(--signal-cyan); }
.btn:active { transform: translateY(1px); }

.btn--primary {
  background: var(--pulse-orange);
  border-color: var(--pulse-orange);
  color: #0A0D1C;
}
.btn--primary:hover {
  background: #FF9147;
  border-color: #FF9147;
  color: #0A0D1C;
}

.btn--ghost { background: rgba(53, 230, 210, .07); border-color: rgba(53, 230, 210, .38); color: var(--signal-cyan); }
.btn--ghost:hover { background: rgba(53, 230, 210, .14); }

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 600;
  color: var(--signal-cyan);
  border-bottom: 2px solid rgba(53, 230, 210, .4);
  padding-bottom: 2px;
  transition: border-color .22s var(--ease), color .22s var(--ease);
}
.link-arrow:hover { border-color: var(--signal-cyan); color: var(--paper-white); }

/* ---------- breadcrumb ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--slate-mute);
}
.breadcrumb li { display: flex; align-items: center; gap: 8px; }
.breadcrumb li::after { content: "/"; color: var(--cyan-deep); }
.breadcrumb li:last-child::after { content: ""; }
.breadcrumb a:hover { color: var(--signal-cyan); }
.breadcrumb [aria-current="page"] { color: var(--paper-white); }

/* ---------- panels ---------- */
.glass-panel {
  position: relative;
  background: var(--glass-indigo);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  padding: 24px;
}

.solid-panel {
  background: var(--deep-indigo);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  padding: 28px;
}

/* ---------- data ---------- */
.stat-figure {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(32px, 5vw, 64px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--signal-cyan);
  font-variant-numeric: tabular-nums;
}

.stat-label {
  display: block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--slate-mute);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  font-variant-numeric: tabular-nums;
  background: var(--deep-indigo);
}
.data-table caption {
  caption-side: top;
  text-align: left;
  padding: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--slate-mute);
}
.data-table th {
  text-align: left;
  padding: 11px 14px;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--slate-mute);
  border-bottom: 1px solid var(--hairline);
  white-space: nowrap;
}
.data-table td {
  padding: 11px 14px;
  color: var(--paper-white);
  border-bottom: 1px solid rgba(42, 51, 88, .55);
  vertical-align: top;
}
.data-table tbody tr:nth-child(odd) { background: rgba(18, 137, 127, .07); }
.data-table tbody tr:hover { background: rgba(53, 230, 210, .08); }
.data-table .num { color: var(--pulse-orange); font-weight: 700; }
.data-table .ok { color: var(--mint-ok); }
.data-table--scroll { display: block; overflow-x: auto; white-space: nowrap; }

/* ---------- timeline ---------- */
.timeline {
  position: relative;
  padding-left: 28px;
}
.timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: linear-gradient(180deg, var(--signal-cyan), rgba(42, 51, 88, .2));
}
.timeline-item {
  position: relative;
  padding-bottom: 32px;
}
.timeline-item:last-child { padding-bottom: 0; }
.timeline-item::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 8px;
  width: 11px;
  height: 11px;
  border: 1px solid var(--signal-cyan);
  background: var(--void-indigo);
}
.timeline-item[data-state="now"]::before { background: var(--pulse-orange); border-color: var(--pulse-orange); }
.timeline-date {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--slate-mute);
  margin-bottom: 4px;
}
.timeline-title { font-size: 18px; font-weight: 700; margin-bottom: 6px; }
.timeline-body { font-size: 15px; color: var(--slate-mute); max-width: 42em; }

/* ---------- accordion ---------- */
.accordion { border-top: 1px solid var(--hairline); }
.accordion-item { border-bottom: 1px solid var(--hairline); }
.accordion-trigger {
  width: 100%;
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 20px 0;
  text-align: left;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--paper-white);
  transition: color .2s var(--ease);
}
.accordion-trigger::before {
  content: attr(data-index);
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  color: var(--signal-cyan);
  padding-top: 4px;
}
.accordion-trigger::after {
  content: "+";
  flex: 0 0 auto;
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--slate-mute);
  transition: transform .25s var(--ease), color .25s var(--ease);
}
.accordion-trigger:hover { color: var(--signal-cyan); }
.accordion-item[data-open] .accordion-trigger::after { content: "–"; color: var(--pulse-orange); transform: rotate(180deg); }
.accordion-panel {
  display: none;
  padding: 0 0 22px 34px;
  font-size: 15px;
  color: var(--slate-mute);
  max-width: 42em;
}
.accordion-item[data-open] .accordion-panel { display: block; }

/* ---------- tier strip ---------- */
.tier-strip {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 8px;
}
.tier-cell {
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  padding: 14px 8px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--slate-mute);
  background: var(--deep-indigo);
  transition: border-color .22s var(--ease), color .22s var(--ease), background-color .22s var(--ease);
}
.tier-cell:hover { border-color: var(--signal-cyan); color: var(--paper-white); }
.tier-cell[data-active] {
  background: rgba(255, 122, 47, .12);
  border-color: var(--pulse-orange);
  color: var(--pulse-orange);
  font-weight: 700;
}
.tier-cell b { display: block; font-size: 16px; color: inherit; }

/* ---------- media frame ---------- */
.media-frame {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  overflow: hidden;
  background-color: var(--deep-indigo);
  background-image:
    radial-gradient(120% 100% at 10% 0%, rgba(53, 230, 210, .16), transparent 55%),
    radial-gradient(90% 90% at 92% 100%, rgba(166, 107, 255, .18), transparent 60%),
    repeating-linear-gradient(115deg, rgba(42, 51, 88, .5) 0 1px, transparent 1px 22px);
}
.media-frame img,
.media-frame video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame figcaption {
  position: absolute;
  left: 0;
  bottom: 0;
  right: 0;
  padding: 12px 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--slate-mute);
  background: linear-gradient(0deg, rgba(7, 10, 24, .9), transparent);
}

/* ---------- reveal ---------- */
.reveal {
  opacity: 0;
  transform: translate3d(0, 12px, 0);
  transition: opacity .32s var(--ease), transform .32s var(--ease);
}
.reveal[data-revealed] { opacity: 1; transform: none; }

/* ============================================================
   顶部命令栏
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(7, 10, 24, .88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--hairline);
}

.header-inner {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--gutter);
  height: var(--header-h);
  display: flex;
  align-items: center;
  gap: 20px;
  transition: height .26s var(--ease);
}
.site-header[data-scrolled] .header-inner { height: var(--header-h-scrolled); }

/* 品牌 */
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
  min-width: 0;
}
.brand-mark {
  position: relative;
  flex: 0 0 auto;
  width: 34px;
  height: 34px;
  border: 2px solid var(--signal-cyan);
  border-radius: var(--radius);
  transition: width .26s var(--ease), height .26s var(--ease);
}
.brand-mark::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 16px;
  height: 2px;
  background: var(--signal-cyan);
  transform: translate(-50%, -50%);
  box-shadow: 0 -6px 0 var(--signal-cyan), 0 6px 0 var(--pulse-orange);
}
.brand-mark--sm { width: 28px; height: 28px; }
.brand-mark--sm::before { width: 12px; box-shadow: 0 -5px 0 var(--signal-cyan), 0 5px 0 var(--pulse-orange); }
.site-header[data-scrolled] .brand-mark { width: 28px; height: 28px; }
.site-header[data-scrolled] .brand-mark::before { width: 12px; }

.brand-text { display: flex; flex-direction: column; min-width: 0; }
.brand-name {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: .01em;
  color: var(--paper-white);
  white-space: nowrap;
}
.brand-domain {
  font-family: var(--font-mono);
  font-size: 10px;
  line-height: 1.4;
  letter-spacing: .06em;
  color: var(--slate-mute);
  white-space: nowrap;
}
.site-header[data-scrolled] .brand-domain { display: none; }

/* 命令式导航 */
.cmd-nav { flex: 1 1 auto; min-width: 0; }
.cmd-nav-list {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2px;
}
.cmd-nav-item { position: relative; }
.cmd-nav-link {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 8px 12px;
  border-radius: var(--radius);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: .02em;
  color: var(--slate-mute);
  position: relative;
  transition: color .2s var(--ease), background-color .2s var(--ease);
}
.cmd-nav-link:hover { color: var(--paper-white); background: rgba(53, 230, 210, .07); }
.nav-index {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .04em;
  color: var(--cyan-deep);
  transition: color .2s var(--ease);
}
.cmd-nav-link:hover .nav-index { color: var(--signal-cyan); }
.cmd-nav-link[aria-current="page"] { color: var(--signal-cyan); }
.cmd-nav-link[aria-current="page"] .nav-index { color: var(--signal-cyan); }
.cmd-nav-link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 2px;
  height: 2px;
  background: var(--signal-cyan);
}

/* 右侧动作 */
.header-actions {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: 8px;
}
.action-btn {
  display: inline-flex;
  align-items: center;
  padding: 7px 13px;
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .04em;
  white-space: nowrap;
  color: var(--slate-mute);
  transition: color .2s var(--ease), border-color .2s var(--ease), background-color .2s var(--ease);
}
.action-btn:hover { color: var(--paper-white); border-color: var(--signal-cyan); }
.action-btn--primary {
  border-color: var(--pulse-orange);
  color: var(--pulse-orange);
}
.action-btn--primary:hover {
  background: var(--pulse-orange);
  border-color: var(--pulse-orange);
  color: var(--void-indigo);
}
.action-btn--jump[aria-expanded="true"] {
  border-color: var(--signal-cyan);
  color: var(--signal-cyan);
  background: rgba(53, 230, 210, .08);
}

/* 快捷跳转浮层 */
.jump-panel {
  position: absolute;
  top: 100%;
  right: var(--gutter);
  width: min(420px, calc(100vw - 48px));
  padding: 20px;
  background: var(--glass-indigo);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  box-shadow: 0 24px 60px rgba(4, 6, 18, .6);
}
.jump-panel-title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--slate-mute);
  margin-bottom: 14px;
}
.jump-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
}
.jump-list a {
  display: block;
  padding: 9px 10px;
  border-radius: var(--radius);
  font-size: 13px;
  color: var(--paper-white);
  transition: background-color .2s var(--ease), color .2s var(--ease);
}
.jump-list a:hover { background: rgba(53, 230, 210, .1); color: var(--signal-cyan); }

/* 移动导航按钮 */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 34px;
  padding: 0 8px;
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
}
.nav-toggle-bar {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--signal-cyan);
  transition: transform .24s var(--ease), opacity .24s var(--ease), background-color .24s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:first-child { transform: translateY(3.5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:last-child { transform: translateY(-3.5px) rotate(-45deg); background: var(--pulse-orange); }

/* 滚动进度 */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  width: 0;
  background: linear-gradient(90deg, var(--signal-cyan), var(--pulse-orange));
  z-index: 150;
  pointer-events: none;
  transition: width .1s linear;
}

/* ============================================================
   页脚
   ============================================================ */
.site-footer {
  margin-top: 96px;
  background: var(--deep-indigo);
  border-top: 1px solid var(--hairline);
  position: relative;
}
.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 140px;
  height: 2px;
  background: var(--signal-cyan);
}

.footer-inner {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(200px, 1.5fr) repeat(4, minmax(0, 1fr));
  gap: 40px 24px;
  padding: 60px 0 40px;
}

.footer-brand { display: flex; flex-direction: column; gap: 8px; align-items: flex-start; }
.footer-name {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--paper-white);
}
.footer-domain {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .05em;
  color: var(--slate-mute);
}
.footer-tagline {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--cyan-deep);
}

.footer-col-title {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--slate-mute);
  margin-bottom: 16px;
}
.footer-links li + li { margin-top: 9px; }
.footer-links a {
  font-size: 14px;
  color: rgba(242, 245, 255, .82);
  transition: color .2s var(--ease), padding-left .2s var(--ease);
}
.footer-links a:hover { color: var(--signal-cyan); padding-left: 4px; }

.footer-contact {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 22px 0;
  border-top: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
}
.footer-contact-line {
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: .03em;
  color: var(--slate-mute);
}
.footer-hours {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--mint-ok);
}

.footer-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 22px 0 32px;
}
.footer-copy,
.footer-legal {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .05em;
  color: var(--slate-mute);
}

/* 返回顶部 */
.back-to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 120;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  width: 52px;
  height: 52px;
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  background: var(--glass-indigo);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  color: var(--signal-cyan);
  opacity: 0;
  visibility: hidden;
  transform: translate3d(0, 10px, 0);
  transition: opacity .26s var(--ease), transform .26s var(--ease), visibility .26s, border-color .22s var(--ease), background-color .22s var(--ease);
}
.back-to-top[data-visible] { opacity: 1; visibility: visible; transform: none; }
.back-to-top:hover { border-color: var(--signal-cyan); background: rgba(53, 230, 210, .12); }
.back-to-top-mark { font-size: 15px; line-height: 1; font-weight: 700; }
.back-to-top-text {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: .14em;
  color: var(--slate-mute);
}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1180px) {
  .cmd-nav-link { padding: 8px 9px; font-size: 12px; }
  .brand-domain { display: none; }
}

@media (max-width: 1024px) {
  :root { --header-h: 58px; }

  .nav-toggle { display: flex; }
  .action-btn--jump { display: none; }

  .cmd-nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 110;
    flex: none;
    padding: 24px var(--gutter) 48px;
    background: var(--void-indigo);
    border-top: 1px solid var(--hairline);
    overflow-y: auto;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translate3d(0, -8px, 0);
    transition: opacity .26s var(--ease), transform .26s var(--ease), visibility .26s;
  }
  .cmd-nav[data-open] {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: none;
  }
  .cmd-nav-list { flex-direction: column; align-items: stretch; gap: 0; }
  .cmd-nav-link {
    display: flex;
    align-items: baseline;
    gap: 14px;
    padding: 16px 4px;
    font-size: 17px;
    font-weight: 600;
    color: var(--paper-white);
    border-bottom: 1px solid var(--hairline);
    border-radius: 0;
  }
  .cmd-nav-link[aria-current="page"]::after { left: 4px; right: auto; width: 32px; bottom: 10px; }
  .nav-index { font-size: 12px; }

  .grid-12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .col-4, .col-5, .col-6, .col-7, .col-8 { grid-column: span 6; }
  .breath { display: none; }

  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-brand { grid-column: span 2; }
}

@media (max-width: 768px) {
  :root { --gutter: 20px; }

  body { font-size: 15px; }
  .section { padding: 64px 0; }
  .section--tight { padding: 44px 0; }

  .display-1 { font-size: clamp(46px, 15vw, 72px); }
  .display-2 { font-size: clamp(28px, 8vw, 40px); }
  .lede { font-size: 17px; }
  .prose { max-width: 100%; }

  .diagonal-divider { height: 48px; margin: 40px 0; }

  .tier-strip { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .tier-cell:nth-child(n + 5) { grid-column: span 1; }

  .footer-grid { gap: 32px 20px; padding: 44px 0 32px; }
  .footer-meta { flex-direction: column; align-items: flex-start; }

  .back-to-top { right: 16px; bottom: 16px; width: 46px; height: 46px; }

  .jump-panel { right: 12px; left: 12px; width: auto; }
}

@media (max-width: 480px) {
  .header-inner { gap: 12px; }
  .brand-name { font-size: 13px; }
  .action-btn { padding: 6px 9px; font-size: 11px; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-brand { grid-column: span 1; }
  .jump-list { grid-template-columns: 1fr; }
  .tier-strip { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .accordion-panel { padding-left: 0; }
  .timeline { padding-left: 22px; }
  .timeline-item::before { left: -22px; }
}

/* ============================================================
   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;
    scroll-behavior: auto !important;
  }

  .reveal { opacity: 1; transform: none; }
  .scroll-progress { transition: none; }
  .back-to-top { transition: opacity .001ms, visibility .001ms; }
}