/* ==========================================================================
   365安卓客 · 共享样式表 /assets/site.css
   蓝图网格 · 左侧轨道 · 夜间设备台
   ========================================================================== */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  background: #0B1626;
}

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

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

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

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

/* ---------- 2. Tokens ---------- */
:root {
  --ink: #0B1626;
  --ink-2: #131F33;
  --ink-3: #101B2C;
  --slate: #243449;

  --cyan: #3FE0C8;
  --cyan-soft: #8FF2E4;
  --amber: #FFA83D;
  --paper: #F3F0E8;
  --paper-ink: #16202E;

  --text: #EAF0F7;
  --text-2: #C4D1E2;
  --muted: #9AA8BC;
  --danger: #FF6B5E;

  --line: #243449;
  --line-cyan: rgba(63, 224, 200, 0.42);
  --grid-line: rgba(63, 224, 200, 0.055);

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

  --track-w: 220px;
  --bar-h: 58px;
  --radius: 4px;

  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --shadow-paper: 6px 6px 0 rgba(6, 12, 22, 0.55);
}

/* ---------- 3. Base ---------- */
body {
  min-height: 100vh;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: 0.01em;
  background-color: var(--ink);
  background-image:
    linear-gradient(to right, var(--grid-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-line) 1px, transparent 1px);
  background-size: 32px 32px;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

h1 { font-size: clamp(40px, 6.4vw, 84px); }
h2 { font-size: clamp(26px, 3.4vw, 42px); }
h3 { font-size: clamp(19px, 2vw, 24px); font-weight: 700; letter-spacing: -0.01em; }
h4 { font-size: 17px; font-weight: 700; letter-spacing: 0; }

p { max-width: none; }

strong { font-weight: 700; color: var(--text); }

a { color: var(--cyan-soft); text-decoration: none; }
a:hover { color: var(--cyan); }

code, kbd, samp, .mono {
  font-family: var(--font-mono);
  font-weight: 500;
  letter-spacing: 0.02em;
  font-size: 0.92em;
}

hr { border: 0; }

::selection { background: rgba(63, 224, 200, 0.28); color: #ffffff; }

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

#main-content { display: block; }

/* ---------- 4. 无障碍工具 ---------- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 300;
  padding: 10px 16px;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  line-height: 1;
  color: #06201B;
  background: var(--cyan);
  border-radius: var(--radius);
  transform: translateY(-220%);
  transition: transform 160ms var(--ease);
}

.skip-link:focus { transform: translateY(0); color: #06201B; }

/* ---------- 5. 页头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
}

.scroll-meter {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  z-index: 220;
  pointer-events: none;
  background: linear-gradient(90deg, var(--cyan), var(--amber));
  transform: scaleX(0);
  transform-origin: left center;
}

.site-header__bar {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  padding: 9px 16px;
  background: rgba(13, 22, 38, 0.96);
  border-bottom: 1px solid var(--line);
}

.nav-toggle {
  display: inline-grid;
  place-items: center;
  width: 38px;
  height: 38px;
  flex: none;
  color: var(--cyan);
  background: rgba(63, 224, 200, 0.07);
  border: 1px solid var(--cyan);
  border-radius: var(--radius);
  transition: background-color 150ms var(--ease), color 150ms var(--ease);
}

.nav-toggle:hover { background: rgba(63, 224, 200, 0.18); }

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 16px;
  height: 2px;
  background: currentColor;
  transition: background-color 180ms var(--ease);
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 2px;
  background: currentColor;
  transition: transform 180ms var(--ease);
}

.nav-toggle__bars::before { top: -5px; }
.nav-toggle__bars::after { top: 5px; }

.site-header[data-open] .nav-toggle__bars { background: transparent; }
.site-header[data-open] .nav-toggle__bars::before { transform: translateY(5px) rotate(45deg); }
.site-header[data-open] .nav-toggle__bars::after { transform: translateY(-5px) rotate(-45deg); }

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
  color: var(--text);
}

.brand:hover { color: var(--cyan); }

.brand__mark {
  display: grid;
  place-items: center;
  flex: none;
  width: 34px;
  height: 34px;
  color: var(--cyan);
  background: rgba(63, 224, 200, 0.07);
  border: 1px solid var(--line-cyan);
  border-radius: var(--radius);
}

.brand__text {
  display: flex;
  flex-direction: column;
  min-width: 0;
  line-height: 1.15;
}

.brand__name {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.brand__sub {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  color: var(--muted);
  white-space: nowrap;
}

.bar__brandline { display: none; }

.bar__tools {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: auto;
}

.bar__item {
  display: none;
  align-items: center;
  padding: 5px 10px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 3px;
  transition: color 150ms var(--ease), border-color 150ms var(--ease);
}

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

.bar__count {
  display: none;
  align-items: center;
  gap: 7px;
  padding: 4px 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  color: var(--amber);
  background: rgba(255, 168, 61, 0.08);
  border: 1px solid rgba(255, 168, 61, 0.35);
  border-radius: 3px;
  white-space: nowrap;
}

.pulse-dot {
  flex: none;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--amber);
  animation: pulse-dot 8s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 0.7; }
  50% { opacity: 1; }
}

.bar__search {
  display: none;
  align-items: center;
  gap: 7px;
  padding: 5px 12px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--muted);
  border: 1px dashed rgba(63, 224, 200, 0.32);
  border-radius: 3px;
  transition: color 150ms var(--ease), border-color 150ms var(--ease);
}

.bar__search::before {
  content: "";
  width: 9px;
  height: 9px;
  border: 1px solid currentColor;
  border-radius: 50%;
}

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

/* --- 轨道（移动端为抽屉） --- */
.site-header__track {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  z-index: 90;
  display: flex;
  flex-direction: column;
  width: min(84vw, 300px);
  padding: 76px 0 22px;
  background-color: var(--ink-2);
  background-image:
    linear-gradient(to right, var(--grid-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-line) 1px, transparent 1px);
  background-size: 32px 32px;
  border-right: 1px solid var(--line-cyan);
  overflow-y: auto;
  overscroll-behavior: contain;
  transform: translateX(-102%);
  visibility: hidden;
  transition: transform 260ms var(--ease), visibility 0s linear 260ms;
}

.site-header[data-open] .site-header__track {
  transform: translateX(0);
  visibility: visible;
  transition: transform 260ms var(--ease), visibility 0s linear 0s;
}

.site-header[data-open]::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 85;
  background: rgba(6, 12, 22, 0.66);
}

.track-nav {
  display: flex;
  flex-direction: column;
}

.track-nav__title {
  padding: 0 18px 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
}

.track-nav__list {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--line);
}

.track-nav__item { border-bottom: 1px solid rgba(36, 52, 73, 0.6); }

.track-nav__link {
  position: relative;
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr);
  align-items: center;
  gap: 8px;
  padding: 11px 18px 11px 16px;
  font-size: 15px;
  color: var(--muted);
  border-left: 2px solid transparent;
  transition: color 150ms var(--ease), background-color 150ms var(--ease), border-color 150ms var(--ease);
}

.track-nav__link::after {
  content: "";
  position: absolute;
  left: 18px;
  right: 18px;
  bottom: 7px;
  height: 1px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 150ms var(--ease);
}

.track-nav__link:hover {
  color: var(--text);
  background: rgba(63, 224, 200, 0.06);
}

.track-nav__link:hover::after { transform: scaleX(1); }

.track-nav__link[aria-current="page"] {
  color: var(--cyan);
  background: rgba(63, 224, 200, 0.09);
  border-left-color: var(--cyan);
}

.track-nav__link[aria-current="page"]::after { transform: scaleX(0); }

.track-nav__idx {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--cyan-soft);
  opacity: 0.72;
}

.track-nav__link[aria-current="page"] .track-nav__idx { opacity: 1; }

.track-nav__label { min-width: 0; }

.track-cta {
  margin: auto 16px 0;
  justify-content: center;
  text-align: center;
}

.track-meta {
  margin: 14px 18px 0;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  color: rgba(154, 168, 188, 0.65);
}

/* ---------- 6. 页脚 ---------- */
.site-footer {
  margin-top: clamp(48px, 7vw, 96px);
  padding: clamp(40px, 6vw, 72px) clamp(18px, 3vw, 40px) 0;
  background-color: var(--ink-3);
  background-image:
    linear-gradient(to right, rgba(63, 224, 200, 0.05) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(63, 224, 200, 0.05) 1px, transparent 1px);
  background-size: 32px 32px;
  border-top: 1px solid var(--line);
  color: var(--muted);
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 44px);
  width: 100%;
  max-width: 1180px;
  margin-left: auto;
  margin-right: 0;
}

.footer__brand { min-width: 0; }

.footer__mark {
  font-family: var(--font-display);
  font-size: clamp(22px, 2.4vw, 28px);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text);
}

.footer__desc {
  margin-top: 10px;
  max-width: 32em;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

.footer__contact {
  display: grid;
  gap: 8px;
  margin-top: 22px;
}

.footer__contact-row {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 10px;
  font-size: 13px;
  line-height: 1.65;
}

.footer__contact-label {
  padding-top: 2px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.footer__contact-value {
  color: var(--text-2);
  word-break: break-word;
}

.footer__note {
  margin-top: 16px;
  padding-left: 12px;
  max-width: 34em;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--muted);
  border-left: 2px solid rgba(63, 224, 200, 0.35);
}

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

.footer__heading {
  padding-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
  border-bottom: 1px solid var(--line);
}

.footer__list {
  display: grid;
  gap: 9px;
}

.footer__link {
  position: relative;
  display: inline-block;
  padding-bottom: 2px;
  font-size: 14px;
  color: var(--muted);
  transition: color 150ms var(--ease);
}

.footer__link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 150ms var(--ease);
}

.footer__link:hover { color: var(--cyan); }
.footer__link:hover::after { transform: scaleX(1); }

.footer__compliance {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 26px;
  margin-top: clamp(32px, 5vw, 56px);
  margin-left: calc(-1 * clamp(18px, 3vw, 40px));
  margin-right: calc(-1 * clamp(18px, 3vw, 40px));
  padding: 16px clamp(18px, 3vw, 40px);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.05em;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

/* ---------- 7. 布局 ---------- */
.container {
  width: 100%;
  max-width: 1180px;
  margin-left: auto;
  margin-right: 0;
  padding-left: clamp(18px, 3vw, 32px);
  padding-right: clamp(20px, 3.5vw, 56px);
}

.section { padding-block: clamp(44px, 6vw, 88px); }
.section + .section { border-top: 1px solid var(--line); }
.section--tight { padding-block: clamp(28px, 4vw, 48px); }

.section__label {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.section__label::before {
  content: "";
  width: 20px;
  height: 1px;
  background: currentColor;
  opacity: 0.7;
}

.lede {
  max-width: 38em;
  font-size: clamp(17px, 1.6vw, 19px);
  line-height: 1.72;
  color: var(--text-2);
}

.stack { display: grid; gap: var(--gap, 16px); }

.cols {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 40px);
}

.cols--2 { grid-template-columns: 1fr; }
.cols--3 { grid-template-columns: 1fr; }
.cols--rail { grid-template-columns: 1fr; }

/* ---------- 8. 组件 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 18px;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  line-height: 1;
  letter-spacing: 0.01em;
  color: var(--text);
  background: transparent;
  border: 1px solid var(--slate);
  border-radius: var(--radius);
  text-decoration: none;
  transition: color 150ms var(--ease), background-color 150ms var(--ease), border-color 150ms var(--ease);
}

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

.btn--primary {
  color: #06201B;
  background: var(--cyan);
  border-color: var(--cyan);
}

.btn--primary:hover {
  color: #06201B;
  background: var(--cyan-soft);
  border-color: var(--cyan-soft);
}

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

.btn--ghost:hover { background: rgba(63, 224, 200, 0.1); }

.btn--amber {
  color: #2B1600;
  background: var(--amber);
  border-color: var(--amber);
}

.btn--amber:hover {
  color: #2B1600;
  background: #FFC06E;
  border-color: #FFC06E;
}

.panel {
  position: relative;
  padding: clamp(20px, 2.6vw, 32px);
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color 150ms var(--ease);
}

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

.panel__label {
  position: absolute;
  right: 12px;
  bottom: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--muted);
  transition: transform 150ms var(--ease), color 150ms var(--ease);
}

.panel:hover .panel__label {
  transform: translateY(-2px);
  color: var(--cyan);
}

.panel--paper {
  color: var(--paper-ink);
  background: var(--paper);
  border: 2px solid #0B1626;
  box-shadow: var(--shadow-paper);
}

.panel--paper h2,
.panel--paper h3,
.panel--paper h4,
.panel--paper strong { color: #0B1626; }

.panel--paper .panel__label { color: rgba(22, 32, 46, 0.6); }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--muted);
  background: rgba(36, 52, 73, 0.5);
  border: 1px solid var(--line);
  border-radius: 3px;
}

.tag--cyan {
  color: var(--cyan);
  background: rgba(63, 224, 200, 0.08);
  border-color: rgba(63, 224, 200, 0.5);
}

.tag--amber {
  color: var(--amber);
  background: rgba(255, 168, 61, 0.08);
  border-color: rgba(255, 168, 61, 0.5);
}

.tag--danger {
  color: var(--danger);
  background: rgba(255, 107, 94, 0.08);
  border-color: rgba(255, 107, 94, 0.5);
}

.crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.crumbs a { color: var(--muted); }
.crumbs a:hover { color: var(--cyan); }

.crumbs__sep { color: rgba(154, 168, 188, 0.5); }

.divider {
  height: 1px;
  margin: 0;
  background: var(--line);
}

.divider--cyan { background: linear-gradient(90deg, rgba(63, 224, 200, 0.65), rgba(63, 224, 200, 0)); }

.img-frame {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background-color: var(--ink-2);
  background-image:
    radial-gradient(120% 90% at 82% 8%, rgba(63, 224, 200, 0.16), transparent 62%),
    linear-gradient(180deg, #16233A, #0F1A2C);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.img-frame > img,
.img-frame > svg {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.img-frame::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(63, 224, 200, 0.09) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(63, 224, 200, 0.09) 1px, transparent 1px);
  background-size: 26px 26px;
}

.img-frame::after {
  content: "";
  position: absolute;
  right: 14px;
  bottom: 14px;
  z-index: 2;
  width: 34px;
  height: 34px;
  border-right: 1px solid var(--cyan);
  border-bottom: 1px solid var(--cyan);
  opacity: 0.8;
}

.img-frame--panorama { aspect-ratio: 21 / 9; }
.img-frame--portrait { aspect-ratio: 4 / 5; }
.img-frame--square { aspect-ratio: 1 / 1; }

.img-frame__caption {
  position: absolute;
  left: 12px;
  top: 12px;
  z-index: 3;
  padding: 3px 9px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--cyan-soft);
  background: rgba(11, 22, 38, 0.72);
  border: 1px solid rgba(63, 224, 200, 0.35);
  border-radius: 3px;
}

.fold {
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color 150ms var(--ease);
}

.fold + .fold { margin-top: 10px; }

.fold:hover { border-color: rgba(63, 224, 200, 0.55); }

.fold__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  width: 100%;
  padding: 16px 18px;
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 600;
  line-height: 1.4;
  text-align: left;
  color: var(--text);
  transition: color 150ms var(--ease);
}

.fold__head:hover { color: var(--cyan); }

.fold__sign {
  position: relative;
  flex: none;
  width: 14px;
  height: 14px;
}

.fold__sign::before,
.fold__sign::after {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 14px;
  height: 1.5px;
  background: var(--cyan);
  transition: transform 220ms var(--ease);
}

.fold__sign::after { transform: rotate(90deg); }

.fold__head[aria-expanded="true"] .fold__sign::after { transform: rotate(0deg); }

.fold__body {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 220ms var(--ease);
}

.fold__head[aria-expanded="true"] + .fold__body { grid-template-rows: 1fr; }

.fold__inner {
  overflow: hidden;
  padding: 0 18px;
  color: var(--muted);
  font-size: 14.5px;
  line-height: 1.75;
}

.fold__head[aria-expanded="true"] + .fold__body .fold__inner { padding-bottom: 18px; }

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 10px;
  background: rgba(19, 31, 51, 0.6);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.filter-tab {
  padding: 7px 14px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.05em;
  color: var(--muted);
  border: 1px solid transparent;
  border-radius: 3px;
  transition: color 150ms var(--ease), background-color 150ms var(--ease), border-color 150ms var(--ease);
}

.filter-tab:hover { color: var(--text); background: rgba(63, 224, 200, 0.07); }

.filter-tab[aria-pressed="true"],
.filter-tab[aria-selected="true"] {
  color: #06201B;
  background: var(--cyan);
  border-color: var(--cyan);
}

.filter-item[hidden] { display: none !important; }

.stepper {
  display: flex;
  flex-wrap: wrap;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.step-tab {
  flex: 1 1 160px;
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 14px 18px;
  font-family: var(--font-body);
  font-size: 14.5px;
  font-weight: 600;
  text-align: left;
  color: var(--muted);
  background: rgba(19, 31, 51, 0.55);
  border-right: 1px solid var(--line);
  transition: color 150ms var(--ease), background-color 150ms var(--ease);
}

.step-tab:last-child { border-right: 0; }

.step-tab:hover { color: var(--text); }

.step-tab__idx {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--cyan-soft);
}

.step-tab[aria-selected="true"] {
  color: var(--text);
  background: rgba(63, 224, 200, 0.12);
  box-shadow: inset 0 -2px 0 var(--cyan);
}

.step-panel[hidden] { display: none !important; }

/* ---------- 9. 响应式 ---------- */
@media (min-width: 560px) {
  .bar__count { display: inline-flex; }
}

@media (min-width: 640px) {
  .cols--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .cols--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .site-footer__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 900px) {
  .cols--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .cols--rail { grid-template-columns: minmax(0, 7fr) minmax(0, 4fr); }
  .site-footer__grid { grid-template-columns: 1.5fr 1fr 1fr 1fr; }
}

@media (min-width: 1024px) {
  body {
    padding-top: var(--bar-h);
    padding-left: var(--track-w);
  }

  .site-header { position: static; }

  .site-header__bar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 80;
    display: flex;
    align-items: center;
    gap: 22px;
    height: var(--bar-h);
    padding: 0 28px;
    background: rgba(11, 22, 38, 0.93);
    border-bottom: 1px solid var(--line);
    -webkit-backdrop-filter: blur(6px);
    backdrop-filter: blur(6px);
  }

  .nav-toggle { display: none; }

  .bar__brandline {
    display: block;
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: 0.12em;
    color: var(--muted);
    white-space: nowrap;
  }

  .bar__tools { margin-left: auto; }

  .bar__item,
  .bar__search { display: inline-flex; }

  .site-header__track {
    top: var(--bar-h);
    bottom: 0;
    width: var(--track-w);
    padding: 26px 0 22px;
    visibility: visible;
    transform: translateX(0);
    transition: none;
    border-right: 1px solid var(--line);
  }

  .site-header[data-open]::after { content: none; }

  .site-header[data-open] .site-header__track { transform: translateX(0); }

  .track-nav__link { font-size: 14.5px; }

  .brand__sub { font-size: 10.5px; }
}

@media (max-width: 559px) {
  .brand__sub { display: none; }
}

/* ---------- 10. 减弱动效 ---------- */
@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 { display: none; }
  .pulse-dot { animation: none; opacity: 1; }
}