/* ==========================================================================
   奇亿测速 · 共享样式 /assets/site.css
   深空仪表盘：命令栏 / 分屏骨架 / 硬阴影面板 / 等宽数据层
   ========================================================================== */

/* ---------- 1. 变量 ---------- */
:root {
  --space-deep: #071426;
  --space-deck: #0C223D;
  --cyan: #31E6D1;
  --orange: #FF7A2F;
  --violet: #8A7CFF;
  --frost: #EAF6FF;
  --mist: #8FA6B8;
  --sage: #7E9C8E;
  --grid-line: #1E3A55;
  --paper: #F2F7FA;
  --ink: #0B1B2B;

  --font-display: "Barlow Condensed", "Oswald", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --font-body: "MiSans", "HarmonyOS Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;

  --bar-h: 64px;
  --bar-h-compact: 56px;
  --container: 1240px;
  --gutter: clamp(18px, 4vw, 48px);
  --radius: 2px;

  --shadow-hard: 8px 8px 0 var(--grid-line);
  --shadow-soft: 4px 4px 0 var(--grid-line);
}

/* ---------- 2. 重置 ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--bar-h) + 16px);
}

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

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

body {
  min-height: 100vh;
  padding-block-start: var(--bar-h);
  background-color: var(--space-deep);
  color: var(--frost);
  font-family: var(--font-body);
  font-size: clamp(16px, 1.05vw, 18px);
  line-height: 1.78;
  letter-spacing: 0.01em;
  overflow-x: hidden;
}

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

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}

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

::selection { background: var(--cyan); color: var(--space-deep); }

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

/* ---------- 3. 中文排版层级 ---------- */
h1, h2, h3, h4,
.display {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.08;
  text-wrap: balance;
  color: var(--frost);
}

h1, .display { font-size: clamp(40px, 6vw, 88px); }
h2 { font-size: clamp(26px, 3.4vw, 40px); }
h3 { font-size: clamp(19px, 2vw, 24px); }
h4 { font-size: clamp(17px, 1.5vw, 19px); }

p { text-wrap: pretty; }

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

.muted { color: var(--mist); }

.lead {
  font-size: clamp(16px, 1.35vw, 19px);
  line-height: 1.82;
  color: var(--frost);
  opacity: 0.92;
  max-width: 62ch;
}

/* ---------- 4. 布局容器 ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.container--narrow {
  max-width: 860px;
}

.section {
  padding-block: clamp(40px, 6vw, 96px);
}

.section-head {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-block-end: clamp(22px, 3vw, 40px);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.eyebrow::before {
  content: "";
  width: 26px;
  height: 2px;
  background: var(--orange);
  flex: 0 0 auto;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(26px, 3.4vw, 40px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--frost);
}

.grid {
  display: grid;
  gap: clamp(16px, 2.4vw, 28px);
}

.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(220px, 320px) minmax(0, 1fr);
  gap: clamp(24px, 4vw, 56px);
  align-items: start;
}

.divider {
  height: 2px;
  border: 0;
  background: var(--grid-line);
  margin-block: clamp(24px, 4vw, 48px);
}

/* ---------- 5. 跳过链接 ---------- */
.skip-link {
  position: fixed;
  inset-block-start: 8px;
  inset-inline-start: 8px;
  z-index: 999;
  padding: 10px 18px;
  background: var(--cyan);
  color: var(--space-deep);
  font-weight: 700;
  font-size: 14px;
  border: 2px solid var(--space-deep);
  box-shadow: var(--shadow-soft);
  transform: translateY(-180%);
  transition: transform 0.2s ease;
}

.skip-link:focus {
  transform: translateY(0);
}

/* ---------- 6. 命令栏 ---------- */
.command-bar {
  position: fixed;
  inset-block-start: 0;
  inset-inline: 0;
  z-index: 120;
  background: rgba(7, 20, 38, 0.95);
  backdrop-filter: blur(12px);
  border-block-end: 2px solid var(--grid-line);
}

.command-bar__inner {
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 26px);
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
  height: var(--bar-h);
  transition: height 0.24s ease;
}

.command-bar[data-compact="true"] .command-bar__inner {
  height: var(--bar-h-compact);
}

.command-bar__brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  background: var(--cyan);
  color: var(--space-deep);
  border: 2px solid var(--cyan);
  box-shadow: 3px 3px 0 var(--orange);
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 700;
  line-height: 1;
}

.brand-mark--lg {
  width: 44px;
  height: 44px;
  font-size: 22px;
  box-shadow: 4px 4px 0 var(--orange);
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
  line-height: 1.1;
}

.brand-title {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--frost);
}

.brand-sub {
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--mist);
}

.command-bar__status {
  display: flex;
  align-items: center;
  gap: 9px;
  padding-inline: 16px;
  border-inline-start: 2px solid var(--grid-line);
  border-inline-end: 2px solid var(--grid-line);
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.4;
  color: var(--mist);
}

.status-text { letter-spacing: 0.02em; }

.status-dot {
  flex: 0 0 auto;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 0 rgba(49, 230, 209, 0.55);
  animation: pulse-dot 2.4s ease-out infinite;
}

@keyframes pulse-dot {
  0%   { box-shadow: 0 0 0 0 rgba(49, 230, 209, 0.55); }
  70%  { box-shadow: 0 0 0 8px rgba(49, 230, 209, 0); }
  100% { box-shadow: 0 0 0 0 rgba(49, 230, 209, 0); }
}

.command-bar__nav {
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.8vw, 26px);
  margin-inline-start: auto;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: clamp(6px, 1.4vw, 20px);
}

.nav-list__item { display: block; }

.nav-link {
  position: relative;
  display: inline-block;
  padding: 6px 2px;
  font-size: 14px;
  font-weight: 500;
  line-height: 1.4;
  color: var(--mist);
  transition: color 0.18s ease;
}

.nav-link::after {
  content: "";
  position: absolute;
  inset-inline: 0;
  inset-block-end: 0;
  height: 2px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.22s ease;
}

.nav-link:hover,
.nav-link:focus-visible { color: var(--frost); }

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

.nav-link[aria-current="page"] { color: var(--cyan); }

.nav-link[aria-current="page"]::after {
  transform: scaleX(1);
  background: var(--orange);
}

.command-bar__actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* ---------- 7. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  line-height: 1.3;
  color: var(--frost);
  background: transparent;
  border: 2px solid var(--grid-line);
  box-shadow: var(--shadow-soft);
  cursor: pointer;
  transition: transform 0.16s ease, box-shadow 0.16s ease,
              background-color 0.16s ease, color 0.16s ease, border-color 0.16s ease;
}

.btn:hover {
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 var(--grid-line);
}

.btn:active {
  transform: translate(2px, 2px);
  box-shadow: 1px 1px 0 var(--grid-line);
}

.btn--primary {
  background: var(--orange);
  border-color: var(--orange);
  color: var(--ink);
  box-shadow: 4px 4px 0 rgba(49, 230, 209, 0.35);
}

.btn--primary:hover {
  background: #ff8f4f;
  border-color: #ff8f4f;
  box-shadow: 6px 6px 0 rgba(49, 230, 209, 0.5);
}

.btn--accent {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--space-deep);
}

.btn--ghost {
  background: transparent;
  border-color: var(--grid-line);
  color: var(--frost);
}

.btn--ghost:hover {
  border-color: var(--cyan);
  color: var(--cyan);
}

.btn--sm {
  padding: 7px 13px;
  font-size: 13px;
}

/* ---------- 8. 移动导航按钮 ---------- */
.nav-toggle {
  display: none;
  flex: 0 0 auto;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  width: 46px;
  height: 46px;
  margin-inline-start: auto;
  background: var(--space-deck);
  border: 2px solid var(--grid-line);
  color: var(--frost);
  transition: border-color 0.18s ease;
}

.nav-toggle:hover { border-color: var(--cyan); }

.nav-toggle__bar {
  display: block;
  width: 20px;
  height: 2px;
  background: currentColor;
  transition: transform 0.22s ease, opacity 0.18s ease;
}

.command-bar[data-open="true"] .nav-toggle { border-color: var(--cyan); color: var(--cyan); }
.command-bar[data-open="true"] .nav-toggle__bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.command-bar[data-open="true"] .nav-toggle__bar:nth-child(2) { opacity: 0; }
.command-bar[data-open="true"] .nav-toggle__bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- 9. 滚动进度 ---------- */
.scroll-progress {
  position: absolute;
  inset-inline: 0;
  inset-block-end: 0;
  height: 2px;
  background: transparent;
  pointer-events: none;
}

.scroll-progress__bar {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--cyan) 0%, var(--cyan) 55%, var(--orange) 100%);
  transition: width 0.08s linear;
}

/* ---------- 10. 面板与数据组件 ---------- */
.panel {
  background: var(--space-deck);
  border: 2px solid var(--grid-line);
  padding: clamp(16px, 2.4vw, 28px);
  box-shadow: var(--shadow-hard);
}

.panel--accent { border-color: var(--cyan); }

.panel--paper {
  background: var(--paper);
  color: var(--ink);
  border-color: var(--grid-line);
}

.panel--paper .muted { color: #4A6478; }
.panel--paper h2,
.panel--paper h3,
.panel--paper h4 { color: var(--ink); }
.panel--paper a { color: #0A6D67; text-decoration: underline; text-underline-offset: 3px; }

.data-figure {
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.data-value {
  font-size: clamp(40px, 7vw, 88px);
  font-weight: 700;
  line-height: 0.95;
  letter-spacing: -0.03em;
  color: var(--cyan);
}

.data-unit {
  font-size: clamp(13px, 1.4vw, 16px);
  letter-spacing: 0.08em;
  color: var(--mist);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--mist);
  background: rgba(30, 58, 85, 0.35);
  border: 1px solid var(--grid-line);
}

.tag--cyan { color: var(--cyan); border-color: var(--cyan); }
.tag--orange { color: var(--orange); border-color: var(--orange); }
.tag--sage { color: var(--sage); border-color: var(--sage); }

/* ---------- 11. 图片容器基础规则 ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  width: 100%;
  aspect-ratio: 16 / 9;
  border: 2px solid var(--grid-line);
  background-color: var(--space-deck);
  background-image:
    linear-gradient(rgba(30, 58, 85, 0.85) 1px, transparent 1px),
    linear-gradient(90deg, rgba(30, 58, 85, 0.85) 1px, transparent 1px);
  background-size: 32px 32px;
  box-shadow: var(--shadow-hard);
}

.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 4 / 5; }
.media-frame--square { aspect-ratio: 1 / 1; }

.media-frame > img,
.media-frame > picture,
.media-frame > picture > img,
.media-frame > video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.media-frame__caption {
  position: absolute;
  inset-inline: 0;
  inset-block-end: 0;
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--mist);
  background: linear-gradient(0deg, rgba(7, 20, 38, 0.94) 0%, rgba(7, 20, 38, 0) 100%);
}

/* ---------- 12. 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-block-start: clamp(18px, 3vw, 34px);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.breadcrumb__item {
  display: flex;
  align-items: center;
  gap: 8px;
}

.breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  color: var(--grid-line);
}

.breadcrumb a { color: var(--mist); transition: color 0.16s ease; }
.breadcrumb a:hover { color: var(--cyan); }
.breadcrumb [aria-current="page"] { color: var(--frost); }

/* ---------- 13. 返回顶部 ---------- */
.back-to-top {
  position: fixed;
  inset-block-end: 24px;
  inset-inline-end: 24px;
  z-index: 110;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--frost);
  background: var(--space-deck);
  border: 2px solid var(--cyan);
  box-shadow: 4px 4px 0 var(--orange);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity 0.22s ease, transform 0.22s ease, visibility 0.22s ease, color 0.16s ease;
}

.back-to-top[data-visible="true"] {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover { color: var(--cyan); }

.back-to-top__glyph {
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1;
}

/* ---------- 14. 页脚 ---------- */
.site-footer {
  margin-block-start: clamp(56px, 8vw, 120px);
  background: var(--space-deck);
  border-block-start: 3px solid var(--cyan);
  color: var(--frost);
}

.site-footer__inner {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding: clamp(28px, 5vw, 64px) var(--gutter) 24px;
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(240px, 1fr) 2.1fr;
  gap: clamp(24px, 4vw, 56px);
  padding-block-end: clamp(24px, 4vw, 44px);
  border-block-end: 1px solid var(--grid-line);
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.footer-brand__link {
  display: inline-flex;
  align-items: center;
  gap: 12px;
}

.footer-tagline {
  font-family: var(--font-display);
  font-size: clamp(20px, 2.2vw, 27px);
  font-weight: 700;
  line-height: 1.24;
  letter-spacing: 0.01em;
  color: var(--frost);
  max-width: 22ch;
}

.footer-summary {
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
  max-width: 36ch;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(18px, 2.4vw, 32px);
}

.footer-col {
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-width: 0;
}

.footer-col-title {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-link {
  display: inline-block;
  font-size: 14px;
  line-height: 1.6;
  color: var(--mist);
  transition: color 0.16s ease, transform 0.16s ease;
}

.footer-link:hover,
.footer-link:focus-visible {
  color: var(--cyan);
  transform: translateX(3px);
}

.footer-contact {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.contact-row {
  display: flex;
  flex-direction: column;
  gap: 1px;
  min-width: 0;
}

.contact-label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mist);
}

.contact-value {
  font-size: 13.5px;
  line-height: 1.55;
  color: var(--frost);
  overflow-wrap: anywhere;
}

.contact-note {
  font-size: 12px;
  line-height: 1.6;
  color: var(--sage);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 24px;
  padding-block-start: 20px;
  font-size: 12.5px;
  color: var(--mist);
}

.footer-copy { letter-spacing: 0.02em; }

.footer-icp {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  color: var(--mist);
}

/* ---------- 15. 响应式 ---------- */
@media (max-width: 1279px) {
  .command-bar__status { display: none; }
}

@media (max-width: 1080px) {
  .nav-toggle { display: flex; }

  .command-bar__nav {
    position: fixed;
    inset-block-start: var(--bar-h);
    inset-inline: 0;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    margin-inline-start: 0;
    padding: 16px var(--gutter) 28px;
    max-height: calc(100vh - var(--bar-h));
    overflow-y: auto;
    background: var(--space-deck);
    border-block-end: 2px solid var(--cyan);
    box-shadow: 0 24px 40px rgba(0, 0, 0, 0.45);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(-10px);
    transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s;
  }

  .command-bar[data-compact="true"] .command-bar__nav {
    inset-block-start: var(--bar-h-compact);
    max-height: calc(100vh - var(--bar-h-compact));
  }

  .command-bar[data-open="true"] .command-bar__nav {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateY(0);
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .nav-list__item + .nav-list__item {
    border-block-start: 1px solid var(--grid-line);
  }

  .nav-link {
    display: block;
    padding: 14px 4px;
    font-size: 16px;
    color: var(--frost);
  }

  .nav-link::after { display: none; }

  .nav-link[aria-current="page"] {
    color: var(--cyan);
    border-inline-start: 3px solid var(--orange);
    padding-inline-start: 12px;
  }

  .command-bar__actions {
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
    margin-block-start: 20px;
    padding-block-start: 18px;
    border-block-start: 2px solid var(--grid-line);
  }

  .command-bar__actions .btn { width: 100%; }

  .footer-top { grid-template-columns: 1fr; }
}

@media (max-width: 900px) {
  .grid--2,
  .grid--3 { grid-template-columns: minmax(0, 1fr); }

  .grid--split {
    grid-template-columns: minmax(0, 1fr);
    gap: clamp(20px, 4vw, 32px);
  }

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

@media (max-width: 560px) {
  :root { --gutter: 18px; }

  .brand-sub { display: none; }

  .brand-title { font-size: 17px; }

  .footer-grid { grid-template-columns: minmax(0, 1fr); gap: 22px; }

  .footer-bottom { flex-direction: column; align-items: flex-start; gap: 6px; }

  .back-to-top {
    inset-block-end: 16px;
    inset-inline-end: 16px;
    padding: 9px 12px;
    font-size: 11px;
  }

  .media-frame { box-shadow: 4px 4px 0 var(--grid-line); }
  .panel { box-shadow: 4px 4px 0 var(--grid-line); }
}

/* ---------- 16. 打印 ---------- */
@media print {
  .command-bar,
  .skip-link,
  .back-to-top,
  .scroll-progress { display: none !important; }

  body {
    padding-block-start: 0;
    background: #ffffff;
    color: #0B1B2B;
  }

  .site-footer {
    background: #ffffff;
    border-block-start: 2px solid #0B1B2B;
    color: #0B1B2B;
  }

  .panel,
  .panel--paper {
    background: #ffffff;
    color: #0B1B2B;
    box-shadow: none;
    border-color: #0B1B2B;
  }
}

/* ---------- 17. 动效降级 ---------- */
@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;
  }

  .status-dot { animation: none; }
}