/* ==========================================================================
   777电玩城 · 共享外壳样式 /assets/site.css
   赛博电玩夜场：霓虹紫 / 电光蓝 / 镭射粉 / 金高光 叠加夜场靛紫
   ========================================================================== */

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 8.5rem; }
body, h1, h2, h3, h4, h5, p, ul, ol, li, figure, blockquote, dl, dd { margin: 0; padding: 0; }
ul, ol { list-style: none; }
img, svg, video { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
table { border-collapse: collapse; width: 100%; }

:root {
  /* 夜场底色 */
  --night-indigo: #150B2E;
  --deep-teal: #06222B;
  --wine: #3A1024;
  --card-purple: #241546;
  /* 霓虹光源 */
  --neon-purple: #A855F7;
  --electric-blue: #35C4F0;
  --laser-pink: #FF4FD8;
  --gold: #FFC64D;
  --pass: #4ADE80;
  /* 文字层 */
  --ink: #F3EEFF;
  --ink-muted: #B7AAD9;
  /* 字体族 */
  --font-display: "Space Grotesk", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", system-ui, sans-serif;
  --font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;
  /* 尺度 */
  --shell: 1240px;
  --gutter: clamp(1rem, 4vw, 2.75rem);
  --radius: 18px;
  --radius-sm: 12px;
  --hdr: 120px;
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink);
  background-color: var(--night-indigo);
  background-image:
    radial-gradient(42% 32% at 84% 4%, rgba(168, 85, 247, 0.18), transparent 70%),
    radial-gradient(38% 30% at 4% 82%, rgba(53, 196, 240, 0.12), transparent 70%);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

::selection { background: rgba(168, 85, 247, 0.45); color: #fff; }

:focus-visible {
  outline: 2px solid var(--electric-blue);
  outline-offset: 2px;
  border-radius: 6px;
}

#main-content { display: block; }
#main-content:focus { outline: none; }

/* ------------------------------ 排版基座 ------------------------------ */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  color: var(--ink);
  line-height: 1.12;
  letter-spacing: -0.01em;
  font-weight: 800;
}
h1 { font-size: clamp(2.4rem, 6.5vw, 5.5rem); line-height: 0.98; letter-spacing: -0.02em; }
h2 { font-size: clamp(1.6rem, 3.4vw, 2.6rem); }
h3 { font-size: clamp(1.15rem, 2vw, 1.5rem); }
h4 { font-size: 1.05rem; }
p { color: var(--ink-muted); }
strong { color: var(--ink); font-weight: 700; }
code, kbd, samp, pre, .mono { font-family: var(--font-mono); font-size: 0.95em; letter-spacing: 0.02em; }

/* ------------------------------ 容器与区块 ------------------------------ */
.shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section {
  position: relative;
  padding-block: clamp(3rem, 8vw, 6rem);
}
.section--teal { background: var(--deep-teal); }
.section--wine { background: var(--wine); }
.section--card { background: linear-gradient(160deg, rgba(36, 21, 70, 0.9), rgba(21, 11, 46, 0.55)); }
.section--slant-top {
  clip-path: polygon(0 3.4rem, 100% 0, 100% 100%, 0 100%);
  padding-top: calc(clamp(3rem, 8vw, 6rem) + 2.4rem);
}
.section--slant-bottom {
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 3.6rem), 0 100%);
  padding-bottom: calc(clamp(3rem, 8vw, 6rem) + 2.6rem);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--neon-purple);
  margin-bottom: 1rem;
}
.eyebrow::before {
  content: "";
  width: 1.9rem;
  height: 1px;
  background: linear-gradient(90deg, var(--neon-purple), rgba(168, 85, 247, 0));
}

/* ------------------------------ 通用网格 ------------------------------ */
.grid { display: grid; gap: clamp(1rem, 2.4vw, 1.9rem); }
.grid--12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }
.col-3 { grid-column: span 3; }
.col-4 { grid-column: span 4; }
.col-5 { grid-column: span 5; }
.col-6 { grid-column: span 6; }
.col-7 { grid-column: span 7; }
.col-8 { grid-column: span 8; }
.col-9 { grid-column: span 9; }
.col-12 { grid-column: span 12; }

/* ------------------------------ 说明牌卡片 ------------------------------ */
.card {
  position: relative;
  background: var(--card-purple);
  border: 1px solid rgba(168, 85, 247, 0.24);
  border-radius: var(--radius);
  padding: clamp(1.15rem, 2.4vw, 1.8rem);
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}
.card:hover,
.card:focus-within {
  transform: translateY(-2px);
  border-color: rgba(53, 196, 240, 0.5);
  box-shadow: 0 0 8px rgba(53, 196, 240, 0.3), 0 18px 40px rgba(5, 2, 16, 0.5);
}
.card > h3 + p, .card > h4 + p { margin-top: 0.55rem; }

/* ------------------------------ 按钮 ------------------------------ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-body);
  font-size: 0.92rem;
  font-weight: 600;
  line-height: 1;
  padding: 0.82rem 1.4rem;
  border-radius: 999px;
  border: 1px solid transparent;
  transition: transform 0.18s ease, box-shadow 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}
.btn--primary {
  background: linear-gradient(120deg, var(--neon-purple), var(--electric-blue));
  color: #0b0620;
  box-shadow: 0 10px 26px rgba(168, 85, 247, 0.3);
}
.btn--primary:hover { transform: translateY(-2px); box-shadow: 0 14px 34px rgba(53, 196, 240, 0.36); }
.btn--ghost {
  background: rgba(36, 21, 70, 0.5);
  color: var(--ink);
  border-color: rgba(53, 196, 240, 0.42);
}
.btn--ghost:hover { transform: translateY(-2px); border-color: var(--electric-blue); color: var(--electric-blue); }

/* ------------------------------ 标签 ------------------------------ */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  padding: 0.32rem 0.66rem;
  border-radius: 999px;
  border: 1px solid rgba(168, 85, 247, 0.42);
  color: var(--ink-muted);
  background: rgba(21, 11, 46, 0.5);
}
.tag--gold { border-color: rgba(255, 198, 77, 0.5); color: var(--gold); }
.tag--pass { border-color: rgba(74, 222, 128, 0.45); color: var(--pass); }

/* ------------------------------ 面包屑 ------------------------------ */
.breadcrumb { padding-block: 1.1rem 0.4rem; }
.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--ink-muted);
}
.breadcrumb li + li::before {
  content: "/";
  margin-right: 0.5rem;
  color: rgba(183, 170, 217, 0.45);
}
.breadcrumb a:hover { color: var(--electric-blue); }
.breadcrumb [aria-current="page"] { color: var(--ink); }

/* ------------------------------ 正文 ------------------------------ */
.prose { max-width: 34em; font-size: 1rem; line-height: 1.75; color: var(--ink-muted); }
.prose h2, .prose h3 { margin-top: 1.6em; margin-bottom: 0.5em; }
.prose ul, .prose ol { margin-top: 0.8em; padding-left: 1.2em; }
.prose ul { list-style: disc; }
.prose ol { list-style: decimal; }
.prose li + li { margin-top: 0.4em; }
.prose a { color: var(--electric-blue); border-bottom: 1px solid rgba(53, 196, 240, 0.4); }

/* ------------------------------ 图片容器 ------------------------------ */
.media {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  border: 1px solid rgba(168, 85, 247, 0.3);
  background: linear-gradient(135deg, #1d1040 0%, #0a2731 60%, #241546 100%);
  aspect-ratio: 16 / 10;
  isolation: isolate;
}
.media > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    repeating-linear-gradient(0deg, rgba(255, 255, 255, 0.035) 0 1px, transparent 1px 4px),
    linear-gradient(200deg, rgba(168, 85, 247, 0.22), transparent 45%, rgba(53, 196, 240, 0.18));
}
.media--wide { aspect-ratio: 21 / 9; }
.media--portrait { aspect-ratio: 3 / 4; }
.media--square { aspect-ratio: 1 / 1; }
.media--tilt { transform: rotate(-1.4deg); }
.media-caption {
  margin-top: 0.7rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--ink-muted);
}

/* ------------------------------ HUD 进度 ------------------------------ */
.hud {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--ink-muted);
}
.meter {
  flex: 1 1 auto;
  height: 6px;
  border-radius: 999px;
  background: rgba(183, 170, 217, 0.18);
  overflow: hidden;
}
.meter-fill {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--neon-purple), var(--electric-blue));
}

/* ------------------------------ 章节目录 ------------------------------ */
.toc { position: sticky; top: 9rem; }
.toc ol { display: grid; gap: 0.05rem; }
.toc a {
  position: relative;
  display: block;
  padding: 0.5rem 0.2rem 0.5rem 0.95rem;
  font-size: 0.85rem;
  color: var(--ink-muted);
  transition: color 0.18s ease;
}
.toc a::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 2px;
  height: 1.1em;
  border-radius: 2px;
  background: var(--neon-purple);
  transform: translateY(-50%) scaleY(0);
  transition: transform 0.2s ease;
}
.toc a:hover { color: var(--ink); }
.toc a.is-active { color: var(--ink); font-weight: 600; }
.toc a.is-active::before { transform: translateY(-50%) scaleY(1); }

/* ------------------------------ 显现与扫光 ------------------------------ */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.js [data-reveal].is-visible { opacity: 1; transform: none; }

[data-reveal] { position: relative; }
[data-reveal]::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 1px;
  pointer-events: none;
  opacity: 0;
  background: linear-gradient(90deg, rgba(168, 85, 247, 0), var(--neon-purple), var(--electric-blue), rgba(53, 196, 240, 0));
  transform: scaleX(0);
  transform-origin: left center;
}
[data-reveal].is-visible::after { animation: sweep-line 600ms ease-out 1 both; }
@keyframes sweep-line {
  0% { opacity: 1; transform: scaleX(0); }
  70% { opacity: 1; }
  100% { opacity: 0; transform: scaleX(1); }
}

/* ==========================================================================
   页头
   ========================================================================== */
.skip-link {
  position: absolute;
  left: 50%;
  top: 0;
  z-index: 200;
  transform: translate(-50%, -130%);
  background: var(--electric-blue);
  color: #061521;
  font-size: 0.85rem;
  font-weight: 700;
  line-height: 1;
  padding: 0.75rem 1.1rem;
  border-radius: 0 0 10px 10px;
  transition: transform 0.18s ease;
}
.skip-link:focus { transform: translate(-50%, 0); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background: rgba(21, 11, 46, 0.94);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(168, 85, 247, 0.22);
}

.utility-bar {
  background: linear-gradient(90deg, rgba(6, 34, 43, 0.94) 0%, rgba(58, 16, 36, 0.6) 58%, rgba(6, 34, 43, 0.94) 100%);
  border-bottom: 1px solid rgba(53, 196, 240, 0.18);
}
.utility-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
  min-height: 44px;
  flex-wrap: wrap;
}
.utility-line {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  color: var(--ink-muted);
}
.utility-line::before {
  content: "";
  flex: none;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--pass);
  box-shadow: 0 0 8px var(--pass);
}
.utility-nav {
  display: flex;
  align-items: center;
  gap: 1.1rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
}
.utility-link {
  color: var(--electric-blue);
  border-bottom: 1px dashed rgba(53, 196, 240, 0.45);
  padding-bottom: 2px;
  transition: color 0.18s ease, border-color 0.18s ease;
}
.utility-link:hover { color: var(--neon-purple); border-color: rgba(168, 85, 247, 0.6); }
.utility-time { color: rgba(183, 170, 217, 0.85); }
.utility-lang {
  color: var(--ink);
  border: 1px solid rgba(183, 170, 217, 0.35);
  border-radius: 999px;
  padding: 0.1rem 0.5rem;
}

.main-bar { position: relative; }
.main-inner {
  display: flex;
  align-items: center;
  gap: clamp(0.7rem, 2vw, 2rem);
  min-height: 76px;
  padding-block: 0.55rem;
}

.brand { display: inline-flex; align-items: center; gap: 0.7rem; margin-right: auto; }
.brand-mark {
  flex: none;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: 0.06em;
  color: #0d0620;
  background: linear-gradient(135deg, var(--electric-blue), var(--neon-purple));
  padding: 0.42rem 0.55rem;
  border-radius: 10px;
  box-shadow: 0 0 18px rgba(168, 85, 247, 0.45);
}
.brand-text { display: block; }
.brand-name {
  display: block;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.12rem;
  letter-spacing: 0.02em;
  color: var(--ink);
  line-height: 1.2;
}
.brand-sub {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-muted);
}

.primary-nav { position: static; }
.nav-list { display: flex; align-items: center; gap: clamp(0.15rem, 1vw, 0.85rem); }
.nav-list a {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 0.34rem;
  padding: 0.6rem 0.32rem;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--ink-muted);
  transition: color 0.18s ease;
}
.nav-num {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: rgba(183, 170, 217, 0.55);
  transition: color 0.18s ease;
}
.nav-list a::after {
  content: "";
  position: absolute;
  left: 0.32rem;
  right: 0.32rem;
  bottom: 0.22rem;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--neon-purple), var(--electric-blue));
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.22s ease;
}
.nav-list a:hover { color: var(--ink); }
.nav-list a:hover::after { transform: scaleX(1); }
.nav-list a[aria-current="page"] { color: var(--ink); font-weight: 700; }
.nav-list a[aria-current="page"]::after { transform: scaleX(1); }
.nav-list a[aria-current="page"] .nav-num { color: var(--laser-pink); }

.cta-chip {
  flex: none;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  line-height: 1;
  color: #150B2E;
  background: linear-gradient(120deg, var(--gold), #ffe9b0);
  padding: 0.62rem 0.95rem;
  border-radius: 999px;
  box-shadow: 0 0 0 1px rgba(255, 198, 77, 0.3), 0 6px 20px rgba(255, 198, 77, 0.18);
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}
.cta-chip:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 0 1px rgba(255, 79, 216, 0.55), 0 10px 26px rgba(255, 79, 216, 0.26);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--ink);
  border: 1px solid rgba(168, 85, 247, 0.45);
  border-radius: 10px;
  padding: 0.5rem 0.72rem;
  background: rgba(36, 21, 70, 0.6);
}
.nav-toggle-bars {
  position: relative;
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
}
.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
}
.nav-toggle-bars::before { top: -6px; }
.nav-toggle-bars::after { top: 6px; }

.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: rgba(168, 85, 247, 0.14);
  overflow: hidden;
  pointer-events: none;
}
.scroll-progress > span {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--neon-purple), var(--electric-blue));
  transition: width 0.12s linear;
}

/* ==========================================================================
   页脚
   ========================================================================== */
.site-footer {
  position: relative;
  overflow: hidden;
  margin-top: clamp(3rem, 8vw, 6rem);
  background: var(--deep-teal);
  border-top: 1px solid rgba(53, 196, 240, 0.2);
  color: var(--ink);
}
.site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(58% 120% at 10% 0%, rgba(53, 196, 240, 0.14), transparent 62%),
    radial-gradient(50% 110% at 94% 100%, rgba(168, 85, 247, 0.16), transparent 62%);
}
.footer-inner {
  position: relative;
  display: grid;
  gap: clamp(1.6rem, 3vw, 2.6rem);
  grid-template-columns: minmax(0, 1.5fr) minmax(0, 0.9fr) minmax(0, 0.9fr) minmax(0, 1.5fr);
  padding-block: clamp(2.4rem, 5vw, 4rem) clamp(1.6rem, 3vw, 2.4rem);
}
.footer-mark {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.5rem;
  letter-spacing: 0.1em;
  color: var(--neon-purple);
  margin-bottom: 0.6rem;
}
.footer-tag {
  max-width: 30em;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--ink-muted);
}
.footer-heading {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 0.9rem;
}
.footer-link-list li + li { margin-top: 0.55rem; }
.footer-link-list a {
  font-size: 0.9rem;
  color: var(--ink-muted);
  border-bottom: 1px solid transparent;
  padding-bottom: 1px;
  transition: color 0.18s ease, border-color 0.18s ease;
}
.footer-link-list a:hover { color: var(--ink); border-bottom-color: rgba(53, 196, 240, 0.65); }

.contact-list li {
  display: grid;
  grid-template-columns: 3.2rem minmax(0, 1fr);
  gap: 0.6rem;
  align-items: baseline;
  font-size: 0.88rem;
  color: var(--ink-muted);
}
.contact-list li + li { margin-top: 0.5rem; }
.contact-key {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.14em;
  color: rgba(183, 170, 217, 0.75);
}
.contact-value { color: var(--ink); word-break: break-word; }
.contact-note {
  margin-top: 0.9rem;
  font-size: 0.8rem;
  line-height: 1.7;
  color: rgba(183, 170, 217, 0.9);
}

.footer-bottom {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem 1.4rem;
  padding-block: 1.1rem 1.6rem;
  border-top: 1px solid rgba(53, 196, 240, 0.16);
}
.footer-update { max-width: 46ch; font-size: 0.8rem; color: var(--ink-muted); }
.footer-legal {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  color: rgba(183, 170, 217, 0.82);
}
.to-top {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--ink);
  border: 1px solid rgba(168, 85, 247, 0.42);
  border-radius: 999px;
  padding: 0.52rem 0.9rem;
  background: rgba(36, 21, 70, 0.7);
  opacity: 0.55;
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease, opacity 0.18s ease;
}
.to-top.is-shown { opacity: 1; }
.to-top:hover {
  transform: translateY(-2px);
  border-color: var(--electric-blue);
  box-shadow: 0 0 18px rgba(53, 196, 240, 0.35);
}

/* ==========================================================================
   响应式
   ========================================================================== */
@media (max-width: 1080px) {
  .footer-inner { grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr) minmax(0, 1.1fr); }
  .footer-col:last-child { grid-column: span 3; }
}

@media (max-width: 900px) {
  html { scroll-padding-top: 7rem; }
  :root { --gutter: clamp(1rem, 5vw, 1.6rem); }

  .utility-inner { min-height: 40px; }
  .utility-line { font-size: 0.74rem; }
  .utility-nav { gap: 0.8rem; }
  .utility-time { display: none; }

  .main-inner { min-height: 64px; gap: 0.6rem; }
  .brand-sub { display: none; }
  .nav-toggle { display: inline-flex; }
  .cta-chip { padding: 0.55rem 0.8rem; font-size: 0.72rem; }

  .primary-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    max-height: min(74vh, 560px);
    overflow-y: auto;
    padding: 0.7rem var(--gutter) 1.4rem;
    background: linear-gradient(180deg, rgba(36, 21, 70, 0.985), rgba(21, 11, 46, 0.985));
    border-top: 1px solid rgba(168, 85, 247, 0.36);
    border-bottom: 1px solid rgba(53, 196, 240, 0.22);
    box-shadow: 0 26px 48px rgba(5, 2, 16, 0.72);
  }
  .primary-nav[data-open] { display: block; animation: nav-drop 0.22s ease-out 1 both; }
  @keyframes nav-drop {
    from { opacity: 0; transform: translateY(-8px); }
    to { opacity: 1; transform: none; }
  }

  .nav-list { flex-direction: column; align-items: stretch; gap: 0; }
  .nav-list li + li { border-top: 1px solid rgba(168, 85, 247, 0.16); }
  .nav-list a { padding: 0.95rem 0.2rem; font-size: 1rem; }
  .nav-list a::after { display: none; }
  .nav-list a[aria-current="page"] .nav-num { color: var(--laser-pink); }
  .nav-list a[aria-current="page"]::before {
    content: "";
    position: absolute;
    left: -0.7rem;
    top: 50%;
    width: 3px;
    height: 1.4rem;
    border-radius: 3px;
    background: var(--neon-purple);
    box-shadow: 0 0 12px var(--neon-purple);
    transform: translateY(-50%);
  }

  .grid--12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .col-3, .col-4 { grid-column: span 3; }
  .col-5, .col-6, .col-7, .col-8, .col-9, .col-12 { grid-column: span 6; }

  .toc { position: static; top: auto; margin-bottom: 1.4rem; }
  .toc ol {
    display: flex;
    gap: 0.5rem;
    overflow-x: auto;
    padding-bottom: 0.55rem;
    -webkit-overflow-scrolling: touch;
  }
  .toc a {
    white-space: nowrap;
    padding: 0.45rem 0.85rem;
    border: 1px solid rgba(168, 85, 247, 0.32);
    border-radius: 999px;
    font-size: 0.78rem;
  }
  .toc a::before { display: none; }
  .toc a.is-active { border-color: rgba(53, 196, 240, 0.7); background: rgba(36, 21, 70, 0.7); }

  .footer-inner { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
  .footer-brand { grid-column: span 2; }
  .footer-col:last-child { grid-column: span 2; }
  .media--tilt { transform: none; }
}

@media (max-width: 560px) {
  body { font-size: 15.5px; }
  .utility-line { font-size: 0.7rem; }
  .utility-lang { display: none; }
  .brand-name { font-size: 1rem; }
  .brand-mark { font-size: 0.9rem; padding: 0.36rem 0.48rem; }

  .grid--12 { grid-template-columns: minmax(0, 1fr); }
  .col-3, .col-4, .col-5, .col-6, .col-7, .col-8, .col-9, .col-12 { grid-column: span 1; }

  .footer-inner { grid-template-columns: minmax(0, 1fr); }
  .footer-brand, .footer-col:last-child { grid-column: span 1; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .section--slant-top { clip-path: polygon(0 2rem, 100% 0, 100% 100%, 0 100%); padding-top: calc(clamp(3rem, 8vw, 6rem) + 1.4rem); }
  .section--slant-bottom { clip-path: polygon(0 0, 100% 0, 100% calc(100% - 2rem), 0 100%); padding-bottom: calc(clamp(3rem, 8vw, 6rem) + 1.4rem); }
}

/* ==========================================================================
   动效降级
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  .js [data-reveal],
  [data-reveal] { opacity: 1 !important; transform: none !important; }
  [data-reveal].is-visible::after { animation: none !important; opacity: 0 !important; }
  .primary-nav[data-open] { animation: none !important; }
  .card:hover, .card:focus-within,
  .btn--primary:hover, .btn--ghost:hover,
  .cta-chip:hover, .to-top:hover { transform: none; }
}