/* =========================================================
   电玩游艺会馆 · 共享样式 /assets/site.css
   夜场底黑 + 霓虹紫 + 电光蓝 + 暖橙，堆叠画板式布局
   ========================================================= */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  background: #0A0618;
}

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

ul, ol { list-style: none; }

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

a { color: inherit; }

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

table { border-collapse: collapse; }

/* ---------- 变量 ---------- */
:root {
  --ink: #0A0618;
  --panel: #160B33;
  --violet: #8B5CF6;
  --cyan: #22D3EE;
  --orange: #FF8A3D;
  --laser: #7DF9FF;
  --gold: #FFC94D;
  --mist: #F5F2FF;
  --muted: #A99FD0;
  --paper: #EDE7DC;

  --font-sans: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", "JetBrains Mono", Consolas, "Liberation Mono", monospace;

  --shell: 1200px;
  --gap: clamp(20px, 3.2vw, 44px);
  --section-gap: clamp(48px, 7vw, 96px);
  --skew-a: -6deg;
  --skew-b: 4deg;

  --line-violet: rgba(139, 92, 246, 0.34);
  --line-soft: rgba(169, 159, 208, 0.24);
}

/* ---------- 基础排版 ---------- */
body {
  min-height: 100vh;
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.8;
  color: var(--mist);
  background-color: var(--ink);
  background-image:
    repeating-linear-gradient(0deg, rgba(245, 242, 255, 0.035) 0 1px, transparent 1px 4px),
    radial-gradient(58rem 38rem at 10% -12%, rgba(139, 92, 246, 0.30), transparent 62%),
    radial-gradient(46rem 30rem at 94% 6%, rgba(34, 211, 238, 0.20), transparent 64%),
    radial-gradient(40rem 30rem at 48% 118%, rgba(255, 138, 61, 0.14), transparent 66%);
  background-attachment: fixed;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-weight: 300;
  line-height: 1.14;
  letter-spacing: -0.01em;
}

h1 { font-size: clamp(48px, 7vw, 120px); }
h2 { font-size: clamp(30px, 3.8vw, 56px); }
h3 { font-size: clamp(20px, 2.1vw, 30px); }
h4 { font-size: clamp(17px, 1.5vw, 21px); }

strong, b { font-weight: 700; color: #fff; }

#main-content { display: block; scroll-margin-top: 120px; }

:focus-visible {
  outline: 2px solid var(--laser);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- 布局壳 / 栅格 ---------- */
.shell {
  width: min(100% - 40px, var(--shell));
  margin-inline: auto;
}

.grid { display: grid; gap: var(--gap); }
.grid--2 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.grid--4 { grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); }

.section { position: relative; padding-block: var(--section-gap); }

.section__head { max-width: 62ch; margin-bottom: clamp(24px, 3vw, 44px); }

.eyebrow {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 0.34em;
  color: var(--violet);
  margin-bottom: 14px;
  text-transform: uppercase;
}

.section__title { font-size: clamp(30px, 4vw, 62px); }

.lede {
  font-size: clamp(15px, 1.4vw, 18px);
  line-height: 1.9;
  color: var(--muted);
  max-width: 38ch;
}

/* ---------- 按钮 ---------- */
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 22px;
  border-radius: 999px;
  border: 1px solid rgba(125, 249, 255, 0.35);
  background: rgba(139, 92, 246, 0.16);
  color: var(--mist);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-decoration: none;
  overflow: hidden;
  transition: transform 0.2s ease, box-shadow 0.3s ease, background 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

.btn:hover { transform: translateY(-2px); }

.btn--primary {
  border-color: transparent;
  background: linear-gradient(100deg, #FF8A3D, #FFB067);
  color: #200E00;
  box-shadow: 0 10px 26px rgba(255, 138, 61, 0.32), inset 0 1px 0 rgba(255, 255, 255, 0.5);
}

.btn--primary:hover { box-shadow: 0 15px 34px rgba(255, 138, 61, 0.46); }

.btn--ghost {
  background: transparent;
  border-color: rgba(34, 211, 238, 0.5);
  color: var(--laser);
}

.btn--ghost:hover { background: rgba(34, 211, 238, 0.12); }

.btn--sm { padding: 8px 16px; font-size: 13px; }

/* ---------- 标签 / 数据 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 11px;
  border-radius: 999px;
  border: 1px solid rgba(169, 159, 208, 0.4);
  color: var(--muted);
  font-size: 11px;
  letter-spacing: 0.16em;
  white-space: nowrap;
}

.tag--orange {
  border-color: transparent;
  background: var(--orange);
  color: #23100A;
  font-weight: 700;
}

.tag--cyan { border-color: rgba(34, 211, 238, 0.55); color: var(--laser); background: rgba(34, 211, 238, 0.12); }
.tag--gold { border-color: rgba(255, 201, 77, 0.5); color: var(--gold); background: rgba(255, 201, 77, 0.1); }

.data {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
  color: var(--gold);
}

/* ---------- 画板卡片 ---------- */
.panel {
  position: relative;
  padding: clamp(20px, 3vw, 36px);
  border: 1px solid var(--line-violet);
  border-radius: 18px;
  background: linear-gradient(150deg, rgba(22, 11, 51, 0.96), rgba(22, 11, 51, 0.8));
  box-shadow: 0 24px 60px rgba(5, 2, 14, 0.7), inset 0 1px 0 rgba(125, 249, 255, 0.14);
}

.panel--paper {
  background: var(--paper);
  color: #241B3B;
  border-color: rgba(10, 6, 24, 0.18);
  box-shadow: 0 24px 60px rgba(5, 2, 14, 0.55);
}

.panel--paper .panel__meta { color: #5C5273; }

.panel__title {
  font-size: clamp(19px, 2.1vw, 28px);
  font-weight: 600;
  letter-spacing: 0;
  color: inherit;
}

.panel__meta {
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--muted);
  text-transform: uppercase;
}

/* ---------- 数据块 ---------- */
.stat { display: flex; flex-direction: column; gap: 4px; }

.stat__value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(26px, 3vw, 40px);
  line-height: 1.1;
  color: var(--gold);
}

.stat__label { font-size: 11px; letter-spacing: 0.22em; color: var(--muted); }

/* ---------- 面包屑 ---------- */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding: 20px 0;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.breadcrumbs__item { display: inline-flex; align-items: center; gap: 10px; }

.breadcrumbs__item:not(:last-child)::after {
  content: "/";
  color: rgba(169, 159, 208, 0.5);
}

.breadcrumbs__link { text-decoration: none; color: var(--muted); }
.breadcrumbs__link:hover { color: var(--laser); }
.breadcrumbs__current { color: var(--mist); }

/* ---------- 正文容器 ---------- */
.prose { max-width: 68ch; color: var(--mist); }
.prose p { margin-bottom: 1.15em; }
.prose p:last-child { margin-bottom: 0; }
.prose h3 { margin: 1.9em 0 0.5em; font-weight: 600; }
.prose ul { display: flex; flex-direction: column; gap: 0.5em; margin-bottom: 1.15em; }
.prose li { position: relative; padding-left: 1.2em; color: var(--muted); }
.prose li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.78em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 8px var(--cyan);
}
.prose a { color: var(--laser); text-decoration: underline; text-underline-offset: 3px; }

/* ---------- 图像容器 ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  border: 1px solid rgba(139, 92, 246, 0.42);
  border-radius: 18px;
  background: linear-gradient(140deg, rgba(139, 92, 246, 0.35), rgba(34, 211, 238, 0.22) 55%, rgba(255, 138, 61, 0.24));
  box-shadow: 0 26px 60px rgba(5, 2, 14, 0.72);
}

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

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(0deg, rgba(10, 6, 24, 0.32) 0 1px, transparent 1px 3px);
  mix-blend-mode: multiply;
}

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

.media-frame--skew { transform: skewY(var(--skew-a)); }

.media-frame--skew > img,
.media-frame--skew > picture > img {
  transform: skewY(6deg) scale(1.1);
}

.media-frame__cap {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 16px 18px 12px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--mist);
  background: linear-gradient(0deg, rgba(10, 6, 24, 0.92), transparent);
}

/* ---------- 折叠卡片 ---------- */
.fold {
  border: 1px solid var(--line-violet);
  border-radius: 14px;
  background: rgba(22, 11, 51, 0.72);
  overflow: hidden;
}

.fold + .fold { margin-top: 12px; }

.fold__trigger {
  display: flex;
  width: 100%;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 20px;
  text-align: left;
  font-weight: 600;
  color: var(--mist);
  transition: background 0.2s ease, color 0.2s ease;
}

.fold__trigger:hover { background: rgba(139, 92, 246, 0.14); color: #fff; }

.fold__icon {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--cyan);
  transition: transform 0.2s ease-out;
}

.fold[data-open="true"] .fold__icon { transform: rotate(45deg); color: var(--orange); }

.fold__panel {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.2s ease-out;
}

.fold[data-open="true"] .fold__panel { max-height: 900px; }

.fold__body {
  padding: 0 20px 18px;
  font-size: 15px;
  line-height: 1.9;
  color: var(--muted);
}

/* ---------- 章节索引 ---------- */
.chapter-index {
  position: sticky;
  top: 116px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 12px;
  letter-spacing: 0.14em;
}

.chapter-index__title {
  font-size: 11px;
  letter-spacing: 0.3em;
  color: var(--muted);
}

.chapter-index__link {
  display: block;
  padding: 6px 0 6px 14px;
  border-left: 1px solid var(--line-soft);
  color: var(--muted);
  text-decoration: none;
  transition: color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.chapter-index__link:hover { color: var(--laser); border-color: var(--laser); }

.chapter-index__link.is-active {
  color: var(--orange);
  border-color: var(--orange);
  transform: translateX(4px);
}

/* ---------- 进入视口 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.24s ease, transform 0.24s ease;
}

[data-reveal].is-visible { opacity: 1; transform: none; }

/* ---------- 滚动进度 / 返回顶部 ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 120;
  width: 0;
  height: 3px;
  pointer-events: none;
  background: linear-gradient(90deg, var(--violet), var(--cyan), var(--orange));
  box-shadow: 0 0 14px rgba(34, 211, 238, 0.7);
  transition: width 0.1s linear;
}

.to-top {
  position: fixed;
  right: clamp(14px, 3vw, 32px);
  bottom: clamp(14px, 3vw, 32px);
  z-index: 110;
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: 1px solid rgba(125, 249, 255, 0.5);
  background: rgba(22, 11, 51, 0.92);
  color: var(--mist);
  font-size: 16px;
  line-height: 1;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  box-shadow: 0 12px 30px rgba(5, 2, 14, 0.7);
  transition: opacity 0.24s ease, transform 0.24s ease, visibility 0.24s ease, box-shadow 0.24s ease, color 0.24s ease;
}

.to-top.is-visible { opacity: 1; visibility: visible; transform: none; }

.to-top:hover {
  color: var(--laser);
  box-shadow: 0 0 0 1px var(--laser), 0 14px 34px rgba(34, 211, 238, 0.35);
}

/* =========================================================
   页头
   ========================================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: linear-gradient(180deg, rgba(10, 6, 24, 0.97), rgba(10, 6, 24, 0.86));
  border-bottom: 1px solid var(--line-violet);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

.skip-link {
  position: absolute;
  left: 16px;
  top: -70px;
  z-index: 200;
  padding: 10px 18px;
  border-radius: 0 0 12px 12px;
  background: var(--orange);
  color: #23100A;
  font-size: 13px;
  font-weight: 700;
  text-decoration: none;
  transition: top 0.2s ease;
}

.skip-link:focus { top: 0; }

/* --- 品牌说明带 --- */
.brand-band {
  position: relative;
  border-bottom: 1px solid rgba(245, 242, 255, 0.08);
  background: linear-gradient(100deg, rgba(139, 92, 246, 0.20), rgba(34, 211, 238, 0.10) 55%, rgba(255, 138, 61, 0.12));
}

.brand-band__inner {
  display: flex;
  align-items: center;
  gap: clamp(12px, 2.2vw, 30px);
  padding-block: 14px;
  transition: padding 0.3s ease;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
  text-decoration: none;
}

.brand__mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--violet), var(--cyan));
  box-shadow: 0 0 18px rgba(139, 92, 246, 0.6);
}

.brand__mark svg {
  width: 22px;
  height: 22px;
  fill: none;
  stroke: #0A0618;
  stroke-width: 2.2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.brand__text { display: flex; flex-direction: column; line-height: 1.25; }

.brand__name {
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.brand__sub {
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--muted);
}

.brand-band__lede {
  flex: 1 1 auto;
  text-align: center;
  font-size: 13px;
  letter-spacing: 0.18em;
  color: var(--muted);
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.version-chip {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  padding: 6px 14px;
  border-radius: 999px;
  border: 1px solid rgba(125, 249, 255, 0.45);
  background: rgba(34, 211, 238, 0.1);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--laser);
}

.version-chip__value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--gold);
}

/* --- 移动端菜单按钮 --- */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: 10px;
  border: 1px solid rgba(125, 249, 255, 0.4);
  color: var(--mist);
  font-size: 12px;
  letter-spacing: 0.16em;
}

.nav-toggle:hover { background: rgba(34, 211, 238, 0.14); }

.nav-toggle__bars {
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  width: 18px;
}

.nav-toggle__bars span {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: var(--laser);
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.site-header[data-open="true"] .nav-toggle__bars span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.site-header[data-open="true"] .nav-toggle__bars span:nth-child(2) { opacity: 0; }
.site-header[data-open="true"] .nav-toggle__bars span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* --- 导航带 --- */
.nav-band {
  position: relative;
  padding-bottom: 12px;
  transition: margin 0.3s ease;
}

.nav-band__inner {
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 12px 16px;
  border: 1px solid var(--line-violet);
  border-radius: 14px;
  background: linear-gradient(120deg, rgba(22, 11, 51, 0.98), rgba(22, 11, 51, 0.9));
  box-shadow: 0 18px 40px rgba(10, 6, 24, 0.75), inset 0 1px 0 rgba(125, 249, 255, 0.18);
}

.site-nav {
  flex: 1 1 auto;
  min-width: 0;
}

.site-nav__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px;
}

.site-nav__link {
  position: relative;
  display: inline-block;
  padding: 10px 14px;
  border: 1px solid transparent;
  border-radius: 10px;
  color: var(--mist);
  font-size: 15px;
  text-decoration: none;
  transition: color 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}

.site-nav__link:hover {
  color: #fff;
  border-color: rgba(125, 249, 255, 0.5);
  background: rgba(139, 92, 246, 0.18);
}

.site-nav__link[aria-current="page"] {
  color: var(--orange);
  border-color: rgba(255, 138, 61, 0.55);
  background: rgba(255, 138, 61, 0.12);
}

.site-nav__link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 5px;
  height: 2px;
  background: var(--orange);
  box-shadow: 0 0 10px var(--orange);
}

.site-nav__sub {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px dashed rgba(169, 159, 208, 0.28);
}

.site-nav__sub-link {
  display: inline-block;
  padding: 4px 11px;
  border: 1px solid rgba(169, 159, 208, 0.28);
  border-radius: 999px;
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-decoration: none;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.site-nav__sub-link:hover {
  color: var(--laser);
  border-color: var(--laser);
  background: rgba(34, 211, 238, 0.1);
}

.nav-band__cta { flex: 0 0 auto; white-space: nowrap; }

/* --- 活动规则栏 --- */
.activity-bar {
  overflow: hidden;
  background: linear-gradient(90deg, rgba(255, 138, 61, 0.16), rgba(139, 92, 246, 0.14) 58%, rgba(34, 211, 238, 0.14));
  border-top: 1px solid rgba(255, 138, 61, 0.3);
  transition: max-height 0.3s ease, opacity 0.3s ease, border-color 0.3s ease;
}

.activity-bar__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  padding-block: 10px;
}

.activity-bar__text {
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--mist);
}

.activity-bar__link {
  padding-bottom: 2px;
  border-bottom: 1px dashed currentColor;
  color: var(--orange);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-decoration: none;
}

.activity-bar__link:hover { color: var(--gold); }

.activity-bar__toggle {
  margin-left: auto;
  padding: 5px 14px;
  border: 1px solid rgba(125, 249, 255, 0.4);
  border-radius: 999px;
  color: var(--laser);
  font-size: 11px;
  letter-spacing: 0.18em;
}

.activity-bar__toggle:hover { background: rgba(34, 211, 238, 0.18); }

.activity-bar[data-collapsed="true"] .activity-bar__text,
.activity-bar[data-collapsed="true"] .activity-bar__link { display: none; }

/* --- 桌面滚过首屏后的收拢 --- */
@media (min-width: 961px) {
  .nav-band { margin-top: -24px; }

  .brand-band {
    max-height: 140px;
    overflow: hidden;
    transition: max-height 0.3s ease, opacity 0.3s ease;
  }

  .activity-bar { max-height: 120px; }

  .site-header[data-scrolled="true"] .brand-band {
    max-height: 0;
    opacity: 0;
  }

  .site-header[data-scrolled="true"] .activity-bar {
    max-height: 0;
    opacity: 0;
    border-color: transparent;
  }

  .site-header[data-scrolled="true"] .nav-band { margin-top: 0; }
}

/* =========================================================
   页脚
   ========================================================= */
.site-footer {
  position: relative;
  margin-top: clamp(64px, 9vw, 128px);
  padding-top: clamp(48px, 6vw, 88px);
  border-top: 1px solid var(--line-violet);
  background: linear-gradient(180deg, rgba(22, 11, 51, 0.6), rgba(10, 6, 24, 0.99) 62%), var(--ink);
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--violet), var(--cyan), var(--orange), transparent);
  opacity: 0.85;
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(210px, 1.1fr) minmax(0, 2fr) minmax(210px, 1.15fr);
  gap: clamp(28px, 4vw, 56px);
  padding-bottom: clamp(32px, 4vw, 56px);
}

.footer-brand__name {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.footer-brand__line {
  margin-top: 12px;
  max-width: 32ch;
  font-size: 14px;
  line-height: 1.9;
  color: var(--muted);
}

.footer-brand__meta {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 16px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--laser);
}

.footer-brand__dot {
  flex: 0 0 auto;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 12px var(--orange);
  animation: fpulse 2.6s ease-in-out infinite;
}

@keyframes fpulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.32; }
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: clamp(16px, 2vw, 28px);
  align-content: start;
}

.footer-col__title {
  margin-bottom: 14px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.28em;
  color: var(--violet);
  text-transform: uppercase;
}

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

.footer-link {
  display: inline-block;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.2s ease, transform 0.2s ease;
}

.footer-link:hover { color: var(--laser); transform: translateX(3px); }

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

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

.footer-contact__list { display: flex; flex-direction: column; gap: 12px; }

.footer-contact__row {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: 14px;
}

.footer-contact__key {
  flex: 0 0 auto;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--muted);
}

.footer-contact__value {
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
  overflow-wrap: anywhere;
}

.footer-contact__note {
  margin-top: 16px;
  max-width: 34ch;
  font-size: 12px;
  line-height: 1.9;
  color: var(--muted);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  padding: 20px 0 28px;
  border-top: 1px solid rgba(169, 159, 208, 0.18);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.footer-bottom__copy { font-size: 12px; }

.legal-links { display: flex; flex-wrap: wrap; gap: 8px 20px; }

.legal-link { text-decoration: none; color: var(--muted); }
.legal-link:hover { color: var(--laser); }

.footer-bottom__icp {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--muted);
}

/* =========================================================
   响应式
   ========================================================= */
@media (max-width: 1100px) {
  .brand-band__lede { display: none; }
}

@media (max-width: 960px) {
  body { font-size: 16px; }

  .nav-toggle { display: inline-flex; margin-left: auto; }

  .nav-band { margin-top: 0; padding-top: 10px; }

  .nav-band__inner {
    flex-direction: column;
    align-items: stretch;
    gap: 12px;
    padding: 12px;
  }

  .site-nav { display: none; width: 100%; }

  .site-nav[data-open="true"] { display: block; }

  .site-header[data-open="true"] .nav-band__inner {
    max-height: calc(100vh - 130px);
    overflow-y: auto;
  }

  .site-nav__list { flex-direction: column; align-items: stretch; gap: 2px; }

  .site-nav__link {
    display: block;
    padding: 12px 14px;
    border-color: rgba(139, 92, 246, 0.25);
    background: rgba(139, 92, 246, 0.08);
  }

  .site-nav__link[aria-current="page"]::after { left: 14px; right: auto; width: 28px; }

  .site-nav__sub { margin-top: 12px; gap: 8px; }

  .site-nav__sub-link { padding: 6px 12px; font-size: 12px; }

  .nav-band__cta { width: 100%; }

  .activity-bar { display: none; }

  .site-header[data-open="true"] .activity-bar {
    display: block;
    max-height: none;
    opacity: 1;
  }

  .activity-bar__inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    padding-block: 12px;
  }

  .activity-bar__toggle { margin-left: 0; }

  .version-chip__label { display: none; }

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

  .footer-brand__line { max-width: 42ch; }
}

@media (max-width: 600px) {
  .shell { width: min(100% - 28px, var(--shell)); }

  .brand__sub { display: none; }

  .brand-band__inner { gap: 10px; }

  .footer-bottom { justify-content: flex-start; }

  .footer-contact__row { flex-wrap: wrap; gap: 4px 10px; }
}

/* ---------- 无障碍：减少动效 ---------- */
@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;
  }

  [data-reveal] { opacity: 1 !important; transform: none !important; }

  .scroll-progress { transition: none; }

  .brand-band__dot, .footer-brand__dot { animation: none; }
}