/* ==========================================================================
   MG游戏站 · 共享样式 /assets/site.css
   午夜焕新：深空黑打底 + 霓虹青蓝 / 熔岩橙双主色 + 荧光黄绿交互反馈
   ========================================================================== */

/* ---------- 1. 设计令牌 ---------- */
:root {
  --ink-void: #0A0C10;
  --ink-panel: #12161D;
  --ink-circuit: #1F232B;
  --cyan: #00E5FF;
  --lava: #FF5E3A;
  --lime: #C8FF00;
  --mist: #F2F5F7;
  --cold: #9AA4B2;
  --lead: #6B7686;
  --holo: linear-gradient(100deg, #00E5FF 0%, #C8FF00 52%, #FF5E3A 100%);

  --font-display: "Source Han Serif SC", "Noto Serif SC", "Songti SC", "STSong", "SimSun", serif;
  --font-body: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-tech: "Orbitron", "JetBrains Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;

  --gutter: clamp(16px, 4vw, 44px);
  --shell: 1320px;
  --chamfer: 18px;
  --chamfer-sm: 10px;
  --rail-w: 84px;
  --rail-w-open: 220px;
  --ease: cubic-bezier(.22, .61, .36, 1);
}

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

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

body {
  margin: 0;
  min-height: 100vh;
  background-color: var(--ink-void);
  background-image:
    radial-gradient(70% 50% at 84% 2%, rgba(0, 229, 255, .11), transparent 68%),
    radial-gradient(60% 46% at 2% 98%, rgba(255, 94, 58, .10), transparent 70%),
    repeating-linear-gradient(0deg, rgba(31, 35, 43, .42) 0 1px, transparent 1px 96px);
  background-attachment: fixed;
  background-repeat: no-repeat;
  color: var(--mist);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

/* ---------- 3. 中文排版 ---------- */
h1, h2, h3, h4, h5, h6 {
  margin: 0 0 .55em;
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.24;
  letter-spacing: .02em;
  color: var(--mist);
}

h1 { font-size: clamp(34px, 5.4vw, 68px); }
h2 { font-size: clamp(26px, 3.4vw, 40px); }
h3 { font-size: clamp(20px, 2.2vw, 28px); }
h4 { font-size: clamp(18px, 1.6vw, 22px); }

p { margin: 0 0 1.2em; }

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

small { font-size: 13px; color: var(--lead); }

hr {
  height: 1px;
  border: 0;
  margin: 40px 0;
  background: linear-gradient(90deg, transparent, var(--ink-circuit) 20%, var(--ink-circuit) 80%, transparent);
}

a {
  color: var(--cyan);
  text-decoration: none;
  transition: color .2s var(--ease);
}
a:hover { color: var(--lime); }

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

/* ---------- 4. 工具类 ---------- */
.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.container {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

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

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
  font-family: var(--font-tech);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: .28em;
  text-transform: uppercase;
  color: var(--cyan);
}
.eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  background: var(--cyan);
  box-shadow: 0 0 10px rgba(0, 229, 255, .9);
}

/* ---------- 5. 按钮 ---------- */
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  font-family: var(--font-tech);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: .14em;
  line-height: 1.2;
  text-transform: uppercase;
  white-space: nowrap;
  color: var(--cyan);
  background: transparent;
  border: 1px solid rgba(0, 229, 255, .5);
  cursor: pointer;
  clip-path: polygon(var(--chamfer-sm) 0, 100% 0, 100% calc(100% - var(--chamfer-sm)), calc(100% - var(--chamfer-sm)) 100%, 0 100%, 0 var(--chamfer-sm));
  transition: background-color .18s var(--ease), color .18s var(--ease), border-color .18s var(--ease), transform .18s var(--ease), box-shadow .18s var(--ease);
}

.btn--primary {
  color: #0A0C10;
  background: var(--lava);
  border-color: var(--lava);
}
.btn--primary:hover {
  color: #0A0C10;
  background: #FF7C5E;
  border-color: #FF7C5E;
  transform: translateY(-2px);
  box-shadow: 0 10px 26px rgba(255, 94, 58, .34);
}

.btn--ghost:hover {
  color: var(--ink-void);
  background: var(--cyan);
  border-color: var(--cyan);
  transform: translateY(-2px);
}

.btn--sm {
  padding: 9px 16px;
  font-size: 11.5px;
  letter-spacing: .1em;
}

/* ---------- 6. 跳转链接 ---------- */
.skip-link {
  position: absolute;
  left: 12px;
  top: -72px;
  z-index: 120;
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 700;
  color: #0A0C10;
  background: var(--lime);
  clip-path: polygon(10px 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%, 0 10px);
  transition: top .2s var(--ease);
}
.skip-link:focus {
  top: 12px;
  color: #0A0C10;
}

/* ---------- 7. 页头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: linear-gradient(180deg, rgba(15, 19, 26, .97) 0%, rgba(10, 12, 16, .95) 100%);
  border-bottom: 1px solid var(--ink-circuit);
  transition: box-shadow .3s var(--ease);
}
.site-header::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(0, 229, 255, .7), rgba(255, 94, 58, .6), transparent);
  opacity: .55;
  pointer-events: none;
}
.site-header[data-scrolled] { box-shadow: 0 16px 44px rgba(0, 0, 0, .65); }

/* 刊头网格 */
.masthead {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 10px 20px;
  max-width: var(--shell);
  margin-inline: auto;
  padding: clamp(14px, 2vw, 22px) var(--gutter) clamp(10px, 1.4vw, 14px);
  transition: padding .3s var(--ease);
}

.masthead__lead {
  margin: 0;
  font-family: var(--font-tech);
  font-size: 11px;
  letter-spacing: .32em;
  text-transform: uppercase;
  color: var(--lead);
  white-space: nowrap;
}

.masthead__actions {
  grid-column: 3;
  justify-self: end;
  display: flex;
  align-items: center;
  gap: 10px;
}

/* 品牌报头 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--mist);
  text-decoration: none;
}
.masthead .brand {
  grid-column: 2;
  justify-self: center;
}
.brand:hover { color: var(--mist); }

.brand__mark {
  position: relative;
  flex: 0 0 auto;
  width: 34px;
  height: 34px;
  background: linear-gradient(140deg, rgba(0, 229, 255, .22), rgba(255, 94, 58, .18));
  border: 1px solid rgba(0, 229, 255, .55);
  clip-path: polygon(26% 0, 100% 0, 100% 74%, 74% 100%, 0 100%, 0 26%);
}
.brand__mark::before {
  content: "";
  position: absolute;
  inset: 9px;
  background: var(--holo);
  opacity: .9;
}
.brand__mark::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 46%, rgba(0, 229, 255, .38) 46% 54%, transparent 54%);
}

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
  text-align: left;
}

.brand__name {
  font-family: var(--font-display);
  font-size: clamp(24px, 3.2vw, 38px);
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--mist);
  background: linear-gradient(96deg, #7CF3FF 0%, #F2F5F7 52%, #FFB3A2 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  transition: font-size .3s var(--ease);
}

@supports not ((-webkit-background-clip: text) or (background-clip: text)) {
  .brand__name {
    color: var(--mist);
    -webkit-text-fill-color: var(--mist);
    background: none;
  }
}

.brand__tagline {
  margin-top: 3px;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--cold);
  white-space: nowrap;
}

.brand--footer .brand__name { font-size: clamp(22px, 2.6vw, 30px); }

.site-header[data-scrolled] .masthead {
  padding-top: 8px;
  padding-bottom: 8px;
}
.site-header[data-scrolled] .brand__tagline { display: none; }
.site-header[data-scrolled] .brand__name { font-size: clamp(20px, 2.4vw, 26px); }

/* 版本徽章 */
.version-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  font-family: var(--font-tech);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
  white-space: nowrap;
  color: var(--cyan);
  background: rgba(0, 229, 255, .07);
  border: 1px solid rgba(0, 229, 255, .42);
  text-shadow: 0 0 14px rgba(0, 229, 255, .65);
  clip-path: polygon(var(--chamfer-sm) 0, 100% 0, 100% calc(100% - var(--chamfer-sm)), calc(100% - var(--chamfer-sm)) 100%, 0 100%, 0 var(--chamfer-sm));
}
.version-badge__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--lime);
  box-shadow: 0 0 0 3px rgba(200, 255, 0, .2), 0 0 10px rgba(200, 255, 0, .9);
}

/* 移动导航按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  padding: 0;
  color: var(--cyan);
  background: rgba(0, 229, 255, .06);
  border: 1px solid rgba(0, 229, 255, .4);
  cursor: pointer;
  clip-path: polygon(var(--chamfer-sm) 0, 100% 0, 100% calc(100% - var(--chamfer-sm)), calc(100% - var(--chamfer-sm)) 100%, 0 100%, 0 var(--chamfer-sm));
}
.nav-toggle__bars {
  position: relative;
  width: 16px;
  height: 2px;
  background: currentColor;
  transition: background-color .2s var(--ease);
}
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 2px;
  background: currentColor;
  transition: transform .22s var(--ease), top .22s var(--ease);
}
.nav-toggle__bars::before { top: -5px; }
.nav-toggle__bars::after { top: 5px; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { top: 0; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after { top: 0; transform: rotate(-45deg); }

/* 导航行 */
.site-nav {
  border-top: 1px solid rgba(31, 35, 43, .85);
}
.site-nav__list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 2px clamp(4px, 1.4vw, 26px);
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 var(--gutter);
  list-style: none;
}
.site-nav__link {
  position: relative;
  display: block;
  padding: 13px 8px;
  font-size: 15px;
  font-weight: 500;
  letter-spacing: .05em;
  color: var(--cold);
  text-decoration: none;
  transition: color .2s var(--ease);
}
.site-nav__link::after {
  content: "";
  position: absolute;
  left: 8px;
  right: 8px;
  bottom: 5px;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--lava));
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .3s var(--ease);
}
.site-nav__link:hover { color: var(--mist); }
.site-nav__link:hover::after { transform: scaleX(1); }
.site-nav__link[aria-current="page"] { color: var(--mist); }
.site-nav__link[aria-current="page"]::after {
  background: var(--cyan);
  transform: scaleX(1);
  box-shadow: 0 0 12px rgba(0, 229, 255, .85);
}

/* ---------- 8. 左侧快捷栏 ---------- */
.quick-rail {
  position: fixed;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  z-index: 55;
  display: flex;
  flex-direction: column;
  gap: 8px;
  width: var(--rail-w);
  padding: 14px 0 18px;
  background: linear-gradient(180deg, rgba(18, 22, 29, .97), rgba(10, 12, 16, .97));
  border: 1px solid var(--ink-circuit);
  border-left: 0;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
  transition: width .3s var(--ease);
}
.quick-rail::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan), var(--lava));
  opacity: .55;
}
.quick-rail[data-open] { width: var(--rail-w-open); }

.rail-toggle {
  align-self: center;
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  margin: 0 0 6px;
  padding: 0;
  color: var(--cold);
  background: rgba(0, 229, 255, .05);
  border: 1px solid rgba(0, 229, 255, .28);
  cursor: pointer;
  clip-path: polygon(6px 0, 100% 0, 100% calc(100% - 6px), calc(100% - 6px) 100%, 0 100%, 0 6px);
  transition: color .2s var(--ease), border-color .2s var(--ease);
}
.rail-toggle:hover {
  color: var(--lime);
  border-color: rgba(200, 255, 0, .7);
}
.rail-toggle__bars {
  position: relative;
  width: 14px;
  height: 2px;
  background: currentColor;
}
.rail-toggle__bars::before,
.rail-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 14px;
  height: 2px;
  background: currentColor;
}
.rail-toggle__bars::before { top: -5px; }
.rail-toggle__bars::after { top: 5px; }

.rail-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin: 0;
  padding: 0 8px;
  list-style: none;
}
.rail-link {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 10px 8px;
  color: var(--cold);
  text-decoration: none;
  border: 1px solid transparent;
  transition: color .2s var(--ease), background-color .2s var(--ease), border-color .2s var(--ease);
}
.rail-link:hover {
  color: var(--mist);
  background: rgba(0, 229, 255, .06);
  border-color: rgba(0, 229, 255, .35);
}
.rail-link[aria-current="page"] {
  color: var(--mist);
  background: rgba(0, 229, 255, .1);
  border-color: rgba(0, 229, 255, .5);
}
.rail-glyph {
  flex: 0 0 40px;
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  font-family: var(--font-tech);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--cyan);
  background: rgba(0, 229, 255, .07);
  border: 1px solid rgba(0, 229, 255, .3);
  clip-path: polygon(30% 0, 100% 0, 100% 70%, 70% 100%, 0 100%, 0 30%);
}
.rail-text {
  max-width: 0;
  overflow: hidden;
  font-size: 13.5px;
  letter-spacing: .04em;
  white-space: nowrap;
  opacity: 0;
  transform: translateX(-6px);
  pointer-events: none;
  transition: max-width .3s var(--ease), opacity .2s var(--ease), transform .2s var(--ease);
}
.quick-rail[data-open] .rail-text {
  max-width: 160px;
  opacity: 1;
  transform: none;
}
.quick-rail[data-open] .rail-link { justify-content: flex-start; }

/* ---------- 9. 阅读进度 ---------- */
.read-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  z-index: 90;
  pointer-events: none;
  background: rgba(31, 35, 43, .5);
}
.read-progress__bar {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: left center;
  background: linear-gradient(90deg, #00E5FF 0%, #C8FF00 55%, #FF5E3A 100%);
  box-shadow: 0 0 12px rgba(0, 229, 255, .8);
}

/* ---------- 10. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(56px, 9vw, 112px);
  border-top: 1px solid var(--ink-circuit);
  background: linear-gradient(180deg, rgba(18, 22, 29, .72) 0%, rgba(10, 12, 16, 1) 62%);
}
.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--cyan) 30%, var(--lava) 70%, transparent);
  opacity: .6;
}

.site-footer__inner {
  display: grid;
  grid-template-columns: minmax(230px, 1.5fr) repeat(2, minmax(150px, 1fr)) minmax(230px, 1.3fr);
  gap: clamp(24px, 4vw, 56px);
  padding-block: clamp(40px, 6vw, 72px);
}

.footer-brand .brand { justify-self: start; }
.footer-brand__note {
  max-width: 34ch;
  margin: 16px 0 20px;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--cold);
}

.footer-col__title {
  margin: 0 0 18px;
  padding-bottom: 10px;
  font-family: var(--font-tech);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .26em;
  text-transform: uppercase;
  color: var(--cyan);
  border-bottom: 1px solid var(--ink-circuit);
}

.footer-list {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.footer-list a {
  font-size: 14.5px;
  color: var(--cold);
  transition: color .2s var(--ease), padding-left .2s var(--ease);
}
.footer-list a:hover {
  color: var(--lime);
  padding-left: 5px;
}

.contact-list {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.contact-row {
  display: grid;
  gap: 2px;
  font-size: 14px;
}
.contact-row__label {
  font-family: var(--font-tech);
  font-size: 10.5px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--lead);
}
.contact-row__value {
  line-height: 1.6;
  color: var(--mist);
  word-break: break-word;
}
.footer-contact__note {
  margin: 16px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--lead);
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 28px;
  padding-block: 20px 28px;
  border-top: 1px solid rgba(31, 35, 43, .85);
  font-size: 13px;
  color: var(--lead);
}
.footer-legal__copy {
  margin: 0;
  font-family: var(--font-tech);
  letter-spacing: .06em;
}
.footer-legal__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.footer-legal__links a {
  font-size: 13px;
  color: var(--cold);
}
.footer-legal__links a:hover { color: var(--lime); }

/* ---------- 11. 通用组件 ---------- */
.section-head {
  position: relative;
  padding-left: 18px;
  transition: color .3s var(--ease);
}
.section-head::before {
  content: "";
  position: absolute;
  left: 0;
  top: .15em;
  bottom: .15em;
  width: 2px;
  background: var(--ink-circuit);
  transition: background-color .3s var(--ease), box-shadow .3s var(--ease);
}
.section-head.is-current { color: var(--mist); }
.section-head.is-current::before {
  background: var(--cyan);
  box-shadow: 0 0 14px rgba(0, 229, 255, .9);
}

.grid {
  display: grid;
  gap: clamp(16px, 2.4vw, 28px);
}
.grid--2 { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.grid--4 { grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); }

.panel {
  position: relative;
  padding: clamp(18px, 2.4vw, 30px);
  background: var(--ink-panel);
  border: 1px solid var(--ink-circuit);
  clip-path: polygon(var(--chamfer) 0, 100% 0, 100% calc(100% - var(--chamfer)), calc(100% - var(--chamfer)) 100%, 0 100%, 0 var(--chamfer));
  transition: transform .3s var(--ease), border-color .3s var(--ease), box-shadow .3s var(--ease);
}
.panel:hover {
  transform: translateY(-2px);
  border-color: rgba(0, 229, 255, .4);
  box-shadow: 0 20px 40px rgba(0, 0, 0, .45);
}
.panel__title {
  margin: 0 0 10px;
  font-size: clamp(19px, 2vw, 22px);
}
.panel__meta {
  margin: 0;
  font-family: var(--font-tech);
  font-size: 11.5px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--lead);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  font-family: var(--font-tech);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--cyan);
  background: rgba(0, 229, 255, .08);
  border: 1px solid rgba(0, 229, 255, .35);
}
.tag--lava {
  color: var(--lava);
  background: rgba(255, 94, 58, .1);
  border-color: rgba(255, 94, 58, .4);
}
.tag--lime {
  color: var(--lime);
  background: rgba(200, 255, 0, .08);
  border-color: rgba(200, 255, 0, .35);
}

.version-code {
  padding: 1px 8px;
  font-family: var(--font-tech);
  font-size: .88em;
  letter-spacing: .06em;
  white-space: nowrap;
  color: var(--cyan);
  background: rgba(0, 229, 255, .1);
  border: 1px solid rgba(0, 229, 255, .3);
}

.media-frame {
  position: relative;
  overflow: hidden;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: linear-gradient(140deg, #131922 0%, #0B0F14 60%, #151015 100%);
  border: 1px solid var(--ink-circuit);
  clip-path: polygon(var(--chamfer) 0, 100% 0, 100% calc(100% - var(--chamfer)), calc(100% - var(--chamfer)) 100%, 0 100%, 0 var(--chamfer));
}
.media-frame::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(70% 60% at 70% 20%, rgba(0, 229, 255, .16), transparent 70%),
    radial-gradient(60% 60% at 20% 85%, rgba(255, 94, 58, .16), transparent 70%),
    repeating-linear-gradient(0deg, rgba(255, 255, 255, .045) 0 1px, transparent 1px 4px);
}
.media-frame > img,
.media-frame > picture,
.media-frame > video,
.media-frame > svg {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--tall { aspect-ratio: 4 / 5; }
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 14px 16px;
  font-size: 12.5px;
  color: var(--cold);
  background: linear-gradient(180deg, transparent, rgba(10, 12, 16, .9));
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-block: 18px;
  font-size: 13px;
  color: var(--lead);
}
.breadcrumb a { color: var(--cold); }
.breadcrumb a:hover { color: var(--lime); }
.breadcrumb__sep { color: var(--ink-circuit); }
.breadcrumb__current { color: var(--mist); }

.stat { display: grid; gap: 4px; }
.stat__value {
  font-family: var(--font-tech);
  font-size: clamp(26px, 3vw, 38px);
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--cyan);
  text-shadow: 0 0 18px rgba(0, 229, 255, .45);
}
.stat__label {
  font-size: 12.5px;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--cold);
}

.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity .55s var(--ease), transform .55s var(--ease);
}
.reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 12. 桌面：为快捷栏让出左侧通道 ---------- */
@media (min-width: 1024px) {
  body { padding-left: var(--rail-w); }
}

/* ---------- 13. 平板：快捷栏变悬浮球 ---------- */
@media (max-width: 1023px) {
  .quick-rail {
    top: auto;
    bottom: 20px;
    left: auto;
    right: 20px;
    transform: none;
    width: 58px;
    height: 58px;
    padding: 0;
    align-items: center;
    justify-content: center;
    border: 1px solid rgba(0, 229, 255, .5);
    border-radius: 50%;
    clip-path: none;
    box-shadow: 0 12px 34px rgba(0, 0, 0, .7), 0 0 22px rgba(0, 229, 255, .22);
  }
  .quick-rail::before { display: none; }
  .quick-rail[data-open] { width: 58px; }
  .rail-toggle {
    width: 100%;
    height: 100%;
    margin: 0;
    border: 0;
    background: transparent;
    clip-path: none;
  }
  .rail-list {
    position: fixed;
    left: 12px;
    right: 12px;
    bottom: 90px;
    gap: 4px;
    padding: 10px;
    background: var(--ink-panel);
    border: 1px solid var(--ink-circuit);
    clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
    box-shadow: 0 24px 48px rgba(0, 0, 0, .7);
    opacity: 0;
    transform: translateY(14px);
    visibility: hidden;
    pointer-events: none;
    transition: opacity .22s var(--ease), transform .22s var(--ease), visibility .22s;
  }
  .quick-rail[data-open] .rail-list {
    opacity: 1;
    transform: none;
    visibility: visible;
    pointer-events: auto;
  }
  .rail-list .rail-link {
    justify-content: flex-start;
    padding: 12px 10px;
  }
  .rail-text {
    max-width: none;
    opacity: 1;
    transform: none;
    pointer-events: auto;
  }
}

/* ---------- 14. 移动导航 ---------- */
@media (max-width: 899px) {
  .nav-toggle { display: inline-flex; }

  .masthead {
    grid-template-columns: auto 1fr;
    gap: 8px 12px;
  }
  .masthead__lead { display: none; }
  .masthead .brand {
    grid-column: 1;
    justify-self: start;
  }
  .masthead__actions {
    grid-column: 2;
    justify-self: end;
  }
  .brand__tagline { display: none; }

  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    display: none;
    max-height: calc(100vh - 88px);
    overflow-y: auto;
    background: linear-gradient(180deg, #12161D 0%, #0C1015 100%);
    border-top: 1px solid var(--ink-circuit);
    border-bottom: 1px solid rgba(0, 229, 255, .3);
    box-shadow: 0 24px 48px rgba(0, 0, 0, .7);
  }
  .site-nav[data-open] { display: block; }

  .site-nav__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 0;
    max-width: none;
    padding: 8px 0;
  }
  .site-nav__link {
    padding: 16px var(--gutter);
    font-size: 16px;
    border-bottom: 1px solid rgba(31, 35, 43, .8);
  }
  .site-nav__link::after { display: none; }
  .site-nav__link[aria-current="page"] {
    color: var(--mist);
    background: rgba(0, 229, 255, .07);
    box-shadow: inset 2px 0 0 var(--cyan);
  }
}

/* ---------- 15. 小屏微调 ---------- */
@media (max-width: 640px) {
  body { font-size: 16px; line-height: 1.8; }
  .version-badge { font-size: 10px; padding: 6px 9px; letter-spacing: .1em; }
  .btn--sm { padding: 9px 13px; font-size: 11px; letter-spacing: .08em; }
}

@media (max-width: 560px) {
  .version-badge { display: none; }
  .brand__name { font-size: 22px; }
  .brand__mark { width: 30px; height: 30px; }
  .footer-legal { flex-direction: column; align-items: flex-start; }
}

/* ---------- 16. 页脚栅格收敛 ---------- */
@media (max-width: 1023px) {
  .site-footer__inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 640px) {
  .site-footer__inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 32px;
  }
  .footer-brand { grid-column: auto; }
}

/* ---------- 17. 降低动态 ---------- */
@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; }
  .panel:hover { transform: none; }
}

/* ---------- 18. 高对比度兜底 ---------- */
@media (forced-colors: active) {
  .btn,
  .version-badge,
  .tag,
  .panel,
  .media-frame { border: 1px solid CanvasText; }
  .skip-link { border: 1px solid CanvasText; }
}