/* ============================================================
   /assets/site.css — 7安装游戏 共享外壳样式
   高原夜空蓝 + 经幡五色 · 技术蓝图网格 · 连续画布
   ============================================================ */

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body { min-height: 100vh; }
img, svg, video { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; background: none; border: 0; }
ul, ol { list-style: none; padding: 0; }
a { color: inherit; text-decoration: none; }
table { border-collapse: collapse; }

/* ---------- Tokens ---------- */
:root {
  --c-night: #070B1A;
  --c-night-deep: #04060F;
  --c-ridge: #101A38;
  --c-flag-blue: #3A72F8;
  --c-flag-white: #F5F8FF;
  --c-flag-red: #E4483F;
  --c-flag-green: #23A06A;
  --c-flag-yellow: #F2B233;
  --c-mist: #7FD3E0;
  --c-slate: #93A3C9;
  --c-nebula: #6C5CE0;

  --ink: #F5F8FF;
  --ink-dim: #C3CDE6;
  --ink-mute: #93A3C9;
  --ink-dark: #0B1226;

  --hair: rgba(127, 211, 224, 0.16);
  --hair-strong: rgba(127, 211, 224, 0.34);

  --font-display: "Noto Serif SC", "Source Han Serif SC", "Songti SC", Georgia, "Times New Roman", serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;

  --r-lg: 28px;
  --r-md: 18px;
  --r-sm: 10px;
  --r-pill: 999px;

  --wrap: 1240px;
  --pad-inline: clamp(18px, 4vw, 44px);
  --section-gap: clamp(40px, 6vw, 92px);

  --shadow-float: 0 26px 60px -34px rgba(58, 114, 248, 0.75), 0 0 0 1px rgba(127, 211, 224, 0.1) inset;
  --ease: cubic-bezier(.22, .68, .32, 1);
}

/* ---------- Base ---------- */
body {
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.85;
  letter-spacing: 0.01em;
  color: var(--ink);
  background-color: var(--c-night);
  background-image:
    radial-gradient(1.4px 1.4px at 14% 9%, rgba(245, 248, 255, 0.6), transparent 60%),
    radial-gradient(1.2px 1.2px at 62% 16%, rgba(127, 211, 224, 0.5), transparent 60%),
    radial-gradient(1.6px 1.6px at 84% 6%, rgba(245, 248, 255, 0.45), transparent 60%),
    radial-gradient(1.2px 1.2px at 38% 32%, rgba(245, 248, 255, 0.32), transparent 60%),
    radial-gradient(110% 70% at 82% -12%, rgba(108, 92, 224, 0.34), transparent 62%),
    radial-gradient(90% 58% at 6% -4%, rgba(58, 114, 248, 0.24), transparent 64%);
  background-repeat: no-repeat;
  background-attachment: fixed, fixed, fixed, fixed, scroll, scroll;
}

/* 蓝图竖向细线网格（固定层，内容在 main 中抬升到其上） */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    90deg,
    rgba(127, 211, 224, 0.055) 0 1px,
    transparent 1px 84px
  );
}

main { position: relative; z-index: 1; }
main:focus { outline: none; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--ink);
}
h1 { font-size: clamp(2.4rem, 5vw, 4.2rem); }
h2 { font-size: clamp(1.6rem, 2.6vw, 2.4rem); }
h3 { font-size: 1.15rem; font-family: var(--font-body); font-weight: 700; }
h4 { font-size: 1rem; font-family: var(--font-mono); font-weight: 600; letter-spacing: 0.08em; }

p { max-width: 74ch; }
strong { font-weight: 700; color: var(--c-flag-white); }

.mono {
  font-family: var(--font-mono);
  font-size: 0.92em;
  letter-spacing: 0.02em;
}
.eyebrow {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-mist);
}
.lede {
  font-size: clamp(1.04rem, 1.5vw, 1.18rem);
  line-height: 1.9;
  color: var(--ink-dim);
  max-width: 62ch;
}
.hair { height: 1px; border: 0; background: var(--hair); margin-block: clamp(24px, 4vw, 44px); }

:focus-visible {
  outline: 2px solid var(--c-mist);
  outline-offset: 3px;
  border-radius: 6px;
}

/* ---------- Layout ---------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--pad-inline);
}

.canvas {
  position: relative;
  padding-block: var(--section-gap);
  background: transparent;
}
.canvas--ridge {
  background: linear-gradient(180deg, rgba(16, 26, 56, 0.92), rgba(7, 11, 26, 0.2));
  border-block: 1px solid var(--hair);
}
.canvas--light {
  background: var(--c-flag-white);
  color: var(--ink-dark);
  border-block: 1px solid rgba(16, 26, 56, 0.12);
}
.canvas--light h1, .canvas--light h2, .canvas--light h3, .canvas--light h4 { color: #070B1A; }
.canvas--light .lede { color: #3B4A6B; }
.canvas--light .eyebrow { color: #2C5AD8; }
.canvas--light a { color: #2649B8; text-decoration: underline; text-underline-offset: 3px; }
.canvas--light .hair { background: rgba(16, 26, 56, 0.16); }
.canvas--breath { padding-block: clamp(72px, 13vw, 168px); }

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(16px, 2vw, 28px);
}
.grid-12 > * { grid-column: 1 / -1; }
@media (min-width: 900px) {
  .span-3 { grid-column: span 3; }
  .span-4 { grid-column: span 4; }
  .span-5 { grid-column: span 5; }
  .span-6 { grid-column: span 6; }
  .span-7 { grid-column: span 7; }
  .span-8 { grid-column: span 8; }
  .span-9 { grid-column: span 9; }
  .span-12 { grid-column: span 12; }
}

.stack > * + * { margin-top: 16px; }

/* ---------- Buttons & chips ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 40px;
  padding: 0 18px;
  border-radius: var(--r-pill);
  border: 1px solid transparent;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.02em;
  white-space: nowrap;
  cursor: pointer;
  transition: background .2s var(--ease), border-color .2s var(--ease), color .2s var(--ease),
              box-shadow .2s var(--ease), transform .2s var(--ease);
}
.btn--primary {
  background: linear-gradient(135deg, var(--c-flag-blue), #2C5AD8);
  color: var(--c-flag-white);
  box-shadow: 0 14px 30px -16px rgba(58, 114, 248, 0.95);
}
.btn--primary:hover { transform: translateY(-1px); box-shadow: 0 20px 36px -18px rgba(58, 114, 248, 1); }
.btn--ghost {
  border-color: var(--hair-strong);
  color: var(--ink);
  background: rgba(245, 248, 255, 0.03);
}
.btn--ghost:hover { border-color: var(--c-mist); background: rgba(127, 211, 224, 0.1); }
.btn--quiet {
  height: 32px;
  padding: 0 12px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  border-color: var(--hair-strong);
  color: var(--c-mist);
  background: transparent;
}
.btn--quiet:hover { border-color: var(--c-mist); background: rgba(127, 211, 224, 0.12); color: var(--c-flag-white); }
.btn--quiet.is-copied {
  border-color: rgba(35, 160, 106, 0.7);
  color: #6FE0AE;
  background: rgba(35, 160, 106, 0.14);
}
.copy-btn__label { pointer-events: none; }

.chip {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 5px 12px;
  border-radius: var(--r-pill);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.03em;
  border: 1px solid var(--hair-strong);
  color: var(--ink-dim);
  background: rgba(245, 248, 255, 0.04);
}
.chip--ok { color: #6FE0AE; border-color: rgba(35, 160, 106, 0.55); background: rgba(35, 160, 106, 0.13); }
.chip--warn { color: #F5A79F; border-color: rgba(228, 72, 63, 0.55); background: rgba(228, 72, 63, 0.13); }
.chip--limit { color: #F8D389; border-color: rgba(242, 178, 51, 0.55); background: rgba(242, 178, 51, 0.13); }
.chip--info { color: #9FC3FF; border-color: rgba(58, 114, 248, 0.55); background: rgba(58, 114, 248, 0.15); }

/* ---------- Header: 命令栏 ---------- */
.skip-link {
  position: absolute;
  left: 14px;
  top: -120px;
  z-index: 99;
  padding: 10px 18px;
  border-radius: var(--r-pill);
  background: var(--c-flag-blue);
  color: var(--c-flag-white);
  font-size: 14px;
  font-weight: 600;
  transition: top .2s var(--ease);
}
.skip-link:focus { top: 12px; }

.cmd-bar {
  position: sticky;
  top: 0;
  z-index: 60;
  color: var(--ink);
  background: rgba(6, 10, 24, 0.86);
  -webkit-backdrop-filter: blur(18px) saturate(1.25);
  backdrop-filter: blur(18px) saturate(1.25);
  border-bottom: 1px solid var(--hair);
  transition: background .3s var(--ease), box-shadow .3s var(--ease);
}
.cmd-bar[data-open] {
  background: rgba(6, 10, 24, 0.98);
  box-shadow: 0 24px 60px -40px rgba(58, 114, 248, 0.9);
}
.cmd-bar__inner {
  max-width: var(--wrap);
  margin-inline: auto;
  padding: 10px var(--pad-inline);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px 24px;
  flex-wrap: wrap;
}
.cmd-bar__id {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
  flex: 1 1 260px;
}
.cmd-bar__status {
  display: none;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.03em;
  color: var(--c-mist);
  padding: 5px 13px;
  border: 1px solid var(--hair-strong);
  border-radius: var(--r-pill);
  background: rgba(127, 211, 224, 0.06);
  white-space: nowrap;
}
.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--c-flag-green);
  box-shadow: 0 0 0 4px rgba(35, 160, 106, 0.18);
  animation: statusPulse 2.8s ease-in-out infinite;
}
@keyframes statusPulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.4; } }

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
  padding: 4px 8px 4px 4px;
  border-radius: var(--r-md);
}
.brand__mark {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  flex: 0 0 44px;
  border-radius: 14px;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--c-flag-white);
  background: linear-gradient(150deg, rgba(58, 114, 248, 0.95), rgba(108, 92, 224, 0.9) 58%, rgba(127, 211, 224, 0.8));
  box-shadow: 0 0 0 1px rgba(127, 211, 224, 0.3), 0 12px 30px -14px rgba(58, 114, 248, 0.95);
}
.brand__mark span { color: var(--c-flag-yellow); }
.brand__text { display: flex; flex-direction: column; min-width: 0; }
.brand__line {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.06rem;
  letter-spacing: 0.02em;
  line-height: 1.32;
}
.brand__sub {
  font-size: 12.5px;
  line-height: 1.4;
  color: var(--ink-mute);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.cmd-bar__actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
  flex-wrap: wrap;
  flex: 0 1 auto;
}
.cmd-bar__hint {
  display: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ink-mute);
  margin-right: 4px;
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  height: 40px;
  padding: 0 14px;
  border-radius: var(--r-pill);
  border: 1px solid var(--hair-strong);
  background: rgba(245, 248, 255, 0.03);
  color: var(--ink);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: border-color .2s var(--ease), background .2s var(--ease);
}
.nav-toggle:hover { border-color: var(--c-mist); background: rgba(127, 211, 224, 0.1); }
.nav-toggle__label { font-family: var(--font-mono); font-size: 12.5px; letter-spacing: 0.08em; }
.nav-toggle__bars {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: background .2s var(--ease);
}
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform .22s var(--ease), top .22s var(--ease);
}
.nav-toggle__bars::before { top: -6px; }
.nav-toggle__bars::after { top: 6px; }
.cmd-bar[data-open] .nav-toggle__bars { background: transparent; }
.cmd-bar[data-open] .nav-toggle__bars::before { top: 0; transform: rotate(45deg); }
.cmd-bar[data-open] .nav-toggle__bars::after { top: 0; transform: rotate(-45deg); }

.cmd-nav {
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--pad-inline);
  border-top: 1px solid var(--hair);
}
.cmd-nav__list { display: flex; flex-wrap: wrap; gap: 2px; }
.cmd-nav__item { display: block; }
.cmd-nav__link {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 11px 14px;
  border-radius: var(--r-sm);
  font-size: 14.5px;
  font-weight: 600;
  color: var(--ink-dim);
  transition: color .2s var(--ease), background .2s var(--ease);
}
.cmd-nav__link:hover { color: var(--c-flag-white); background: rgba(127, 211, 224, 0.08); }
.cmd-nav__idx {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--ink-mute);
}
.cmd-nav__link[aria-current="page"] { color: var(--c-flag-white); }
.cmd-nav__link[aria-current="page"] .cmd-nav__idx { color: var(--c-mist); }
.cmd-nav__link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 4px;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--c-flag-blue), var(--c-mist));
}

.cmd-bar__progress {
  height: 2px;
  background: rgba(127, 211, 224, 0.1);
  overflow: hidden;
}
.cmd-bar__progress-fill {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--c-flag-blue), var(--c-mist), var(--c-flag-yellow));
  transition: transform .12s linear;
}

@media (min-width: 900px) {
  .cmd-bar__status { display: inline-flex; }
  .nav-toggle { display: none; }
}
@media (min-width: 1180px) {
  .cmd-bar__hint { display: block; }
}
@media (max-width: 899px) {
  .brand__sub { max-width: 46vw; }
  .cmd-nav {
    max-height: 0;
    overflow: hidden;
    border-top-color: transparent;
    transition: max-height .3s var(--ease), border-color .3s var(--ease);
  }
  .cmd-bar[data-open] .cmd-nav {
    max-height: 72vh;
    overflow-y: auto;
    border-top-color: var(--hair);
  }
  .cmd-nav__list { flex-direction: column; padding: 8px 0 16px; }
  .cmd-nav__link { padding: 13px 14px; }
  .cmd-nav__link[aria-current="page"] { background: rgba(58, 114, 248, 0.16); }
  .cmd-nav__link[aria-current="page"]::after { display: none; }
}

/* ---------- Footer ---------- */
.site-foot {
  position: relative;
  margin-top: clamp(48px, 8vw, 128px);
  color: var(--ink-dim);
  background: linear-gradient(180deg, rgba(7, 11, 26, 0.98), var(--c-night-deep));
  border-top: 1px solid var(--hair);
  overflow: hidden;
}
.site-foot::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    radial-gradient(1.2px 1.2px at 22% 14%, rgba(245, 248, 255, 0.42), transparent 60%),
    radial-gradient(1.2px 1.2px at 68% 8%, rgba(127, 211, 224, 0.4), transparent 60%),
    radial-gradient(70% 70% at 88% 0%, rgba(108, 92, 224, 0.24), transparent 62%),
    radial-gradient(58% 58% at 4% 12%, rgba(58, 114, 248, 0.18), transparent 62%);
  background-repeat: no-repeat;
}
.site-foot__ridge {
  position: relative;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(127, 211, 224, 0.55), rgba(242, 178, 51, 0.32), transparent);
}
.site-foot__inner {
  position: relative;
  z-index: 1;
  max-width: var(--wrap);
  margin-inline: auto;
  padding: clamp(32px, 5vw, 66px) var(--pad-inline) 26px;
}
.foot-grid {
  display: grid;
  gap: clamp(24px, 3vw, 40px);
  grid-template-columns: repeat(2, minmax(0, 1fr));
}
.foot-brand { grid-column: 1 / -1; display: flex; flex-direction: column; gap: 14px; }
.brand--foot { padding-left: 0; }
.foot-coord {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--c-mist);
}
.foot-coord .mono { color: var(--c-flag-white); }
.foot-summary {
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-mute);
  max-width: 46ch;
}
.foot-col__title {
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-mist);
  margin-bottom: 14px;
}
.foot-list { display: flex; flex-direction: column; gap: 10px; }
.foot-link {
  display: inline-block;
  font-size: 14.5px;
  color: var(--ink-dim);
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}
.foot-link:hover { color: var(--c-flag-white); border-bottom-color: var(--c-mist); }
.foot-link[aria-current="page"] { color: var(--c-mist); border-bottom-color: rgba(127, 211, 224, 0.5); }

.foot-stat dl { display: flex; flex-direction: column; gap: 8px; }
.foot-stat dl > div {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 6px;
  border-bottom: 1px dashed rgba(127, 211, 224, 0.2);
  font-size: 13.5px;
}
.foot-stat dt { color: var(--ink-mute); }
.foot-stat dd { font-family: var(--font-mono); font-size: 13px; color: var(--c-flag-white); }

.foot-bottom {
  margin-top: clamp(26px, 4vw, 50px);
  padding-top: 22px;
  border-top: 1px solid var(--hair);
  display: grid;
  gap: 20px;
}
.foot-contact { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 12px; }
.foot-contact__row {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  font-size: 14px;
  color: var(--ink-dim);
  max-width: 100%;
}
.foot-contact__key {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ink-mute);
  border-left: 2px solid rgba(58, 114, 248, 0.7);
  padding-left: 8px;
}
.foot-contact .mono { color: var(--c-flag-white); }
.foot-meta { display: flex; flex-direction: column; gap: 8px; }
.foot-legal {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--ink-mute);
}
.foot-note {
  font-size: 13px;
  line-height: 1.75;
  color: var(--ink-mute);
  max-width: 62ch;
}

.to-top {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 70;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 44px;
  padding: 0 16px;
  border-radius: var(--r-pill);
  border: 1px solid var(--hair-strong);
  background: rgba(10, 16, 36, 0.92);
  color: var(--c-mist);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity .25s var(--ease), transform .25s var(--ease), visibility .25s var(--ease),
              border-color .2s var(--ease), background .2s var(--ease), color .2s var(--ease);
}
.to-top.is-visible { opacity: 1; visibility: visible; transform: none; }
.to-top:hover { border-color: var(--c-mist); background: rgba(58, 114, 248, 0.24); color: var(--c-flag-white); }
.to-top__arrow { font-size: 14px; }

@media (min-width: 700px) {
  .foot-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}
@media (min-width: 1080px) {
  .foot-grid { grid-template-columns: 1.7fr 0.8fr 0.8fr 0.85fr 1.05fr; }
  .foot-brand { grid-column: auto; }
  .foot-bottom { grid-template-columns: 1.15fr 0.85fr; align-items: start; }
}

/* ---------- Page components ---------- */
.breadcrumb {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--ink-mute);
  margin-bottom: 18px;
}
.breadcrumb ol { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.breadcrumb li::after { content: "/"; margin-left: 8px; color: rgba(127, 211, 224, 0.4); }
.breadcrumb li:last-child::after { content: ""; }
.breadcrumb a:hover { color: var(--c-mist); }
.breadcrumb [aria-current="page"] { color: var(--ink-dim); }

.panel {
  position: relative;
  padding: clamp(18px, 3vw, 32px);
  border: 1px solid var(--hair);
  border-radius: var(--r-lg);
  background: linear-gradient(165deg, rgba(16, 26, 56, 0.94), rgba(7, 11, 26, 0.9));
}
.panel--float { box-shadow: var(--shadow-float); }
.panel--flag {
  border-color: var(--hair-strong);
  background: linear-gradient(150deg, rgba(58, 114, 248, 0.22), rgba(108, 92, 224, 0.18) 60%, rgba(127, 211, 224, 0.12));
}
.panel > * + * { margin-top: 14px; }

.coord-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding-left: 10px;
  border-left: 2px solid var(--c-flag-blue);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--c-mist);
}

.rail { display: none; }
@media (min-width: 1240px) {
  .rail {
    display: block;
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    width: 64px;
    z-index: 1;
    pointer-events: none;
    background-image: repeating-linear-gradient(180deg, rgba(127, 211, 224, 0.26) 0 1px, transparent 1px 48px);
    background-repeat: no-repeat;
    background-size: 10px 100%;
    background-position: 50px 0;
  }
  .rail__readout {
    position: sticky;
    top: 46vh;
    padding-left: 22px;
    writing-mode: vertical-rl;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.3em;
    color: var(--ink-mute);
  }
}

.spec-list { display: grid; gap: 9px; }
.spec-list > div {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 8px;
  border-bottom: 1px dashed rgba(127, 211, 224, 0.2);
  font-size: 14.5px;
}
.spec-list dt { color: var(--ink-mute); }
.spec-list dd { font-family: var(--font-mono); font-size: 14px; color: var(--c-flag-white); }

.table-scroll {
  overflow-x: auto;
  border: 1px solid var(--hair);
  border-radius: var(--r-md);
  background: rgba(16, 26, 56, 0.55);
}
.data-table { width: 100%; min-width: 560px; font-size: 15px; }
.data-table caption {
  padding: 14px 16px;
  text-align: left;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--c-mist);
  border-bottom: 1px solid var(--hair);
}
.data-table th, .data-table td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid rgba(127, 211, 224, 0.1);
}
.data-table thead th {
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-mute);
  background: rgba(127, 211, 224, 0.06);
}
.data-table tbody tr:nth-child(even) { background: rgba(16, 26, 56, 0.6); }
.data-table tbody tr:hover { background: rgba(58, 114, 248, 0.14); }
.data-table td.is-mono, .data-table .mono { font-family: var(--font-mono); font-size: 14px; color: var(--c-flag-white); }

.steps { counter-reset: step; display: grid; gap: 14px; }
.steps li {
  position: relative;
  padding-left: 52px;
  font-size: 15.5px;
  color: var(--ink-dim);
}
.steps li::before {
  counter-increment: step;
  content: "0" counter(step);
  position: absolute;
  left: 0;
  top: 3px;
  padding: 2px 9px;
  border: 1px solid var(--hair-strong);
  border-radius: var(--r-pill);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--c-mist);
}

.fold {
  border: 1px solid var(--hair);
  border-radius: var(--r-md);
  background: rgba(16, 26, 56, 0.5);
  overflow: hidden;
  transition: border-color .2s var(--ease), background .2s var(--ease);
}
.fold + .fold { margin-top: 10px; }
.fold > summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
  font-size: 15.5px;
  font-weight: 600;
  color: var(--ink);
  transition: color .2s var(--ease), background .2s var(--ease);
}
.fold > summary::-webkit-details-marker { display: none; }
.fold > summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--c-mist);
  transition: transform .24s var(--ease), color .24s var(--ease);
}
.fold[open] > summary { color: var(--c-flag-white); background: rgba(58, 114, 248, 0.12); }
.fold[open] > summary::after { content: "–"; color: var(--c-flag-yellow); }
.fold.is-open { border-color: var(--hair-strong); }
.fold__body {
  padding: 0 18px 18px;
  font-size: 15.5px;
  color: var(--ink-dim);
  animation: foldIn .24s var(--ease);
}
.fold__body > * + * { margin-top: 12px; }
@keyframes foldIn { from { opacity: 0; transform: translateY(-4px); } to { opacity: 1; transform: none; } }

/* 图片容器（页面阶段放置产品渲染图、山脉轮廓、星空图） */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  border-radius: var(--r-lg);
  border: 1px solid var(--hair);
  background:
    radial-gradient(80% 60% at 78% 8%, rgba(108, 92, 224, 0.36), transparent 62%),
    radial-gradient(70% 70% at 12% 96%, rgba(58, 114, 248, 0.3), transparent 64%),
    var(--c-ridge);
  isolation: isolate;
}
.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(90deg, rgba(127, 211, 224, 0.09) 0 1px, transparent 1px 64px),
    repeating-linear-gradient(180deg, rgba(127, 211, 224, 0.07) 0 1px, transparent 1px 64px);
}
.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  position: relative;
  z-index: 1;
}
.media-frame--wide { aspect-ratio: 16 / 9; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--bleed { border-radius: 0; border-inline: 0; }
.media-figure { margin: 0; }
.media-figure figcaption {
  padding-top: 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.03em;
  color: var(--ink-mute);
}
@media (max-width: 640px) {
  .media-frame { border-radius: var(--r-md); }
}

/* ---------- 显现动效 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity .55s var(--ease), transform .55s var(--ease);
}
[data-reveal].is-in { opacity: 1; transform: none; }

/* ---------- 响应式收尾 ---------- */
@media (max-width: 560px) {
  body { font-size: 16px; }
  .btn { height: 38px; padding: 0 14px; font-size: 13.5px; }
  .cmd-bar__actions .btn--ghost { display: none; }
  .foot-contact__row { font-size: 13.5px; }
  .to-top { right: 12px; bottom: 12px; height: 40px; padding: 0 13px; }
}

/* ---------- 减少动态偏好 ---------- */
@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;
  }
  [data-reveal] { opacity: 1; transform: none; }
  .to-top { transform: none; }
}