@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700&display=swap');

:root {
  --ink: #0d0d0d;
  --v: #8000ff;
  --m: #ff00ff;
  --line: rgba(255, 0, 255, 0.28);
  --line-soft: rgba(128, 0, 255, 0.22);
  --txt: #eae3f7;
  --dim: #a99ec4;
  --bar: 66px;
  --font: 'Space Grotesk', -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
}

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

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

body {
  margin: 0;
  background: var(--ink);
  color: var(--txt);
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.78;
  overflow-x: hidden;
  padding-bottom: 0;
}

body.menu-open { overflow: hidden; }

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 90;
  pointer-events: none;
  background: repeating-linear-gradient(to bottom, rgba(255, 255, 255, 0.05) 0 1px, transparent 1px 3px);
  mix-blend-mode: screen;
  opacity: 0.7;
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 89;
  pointer-events: none;
  background: radial-gradient(circle at 50% 0%, rgba(128, 0, 255, 0.16), transparent 62%);
}

img { max-width: 100%; height: auto; display: block; }

a { color: var(--m); text-decoration: none; }
a:hover { text-shadow: 0 0 12px rgba(255, 0, 255, 0.75); }

hr {
  border: 0;
  height: 1px;
  margin: 16px 0;
  background: linear-gradient(90deg, var(--m), var(--v), transparent);
}

/* ---------- 底部固定条 ---------- */
.bar {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 80;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  min-height: var(--bar);
  padding: 8px 18px;
  background: rgba(13, 13, 13, 0.94);
  border-top: 1px solid var(--line);
  backdrop-filter: blur(10px);
}

.bar-brand {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 8px 0;
  font-size: 1.06rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: #fff;
  text-shadow: 0 0 14px rgba(255, 0, 255, 0.65), 0 0 34px rgba(128, 0, 255, 0.55);
  max-width: 52vw;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.bar-act { display: flex; align-items: center; gap: 10px; }

.bar-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 4px;
  color: var(--txt);
  font-size: 1rem;
  letter-spacing: 0.04em;
}

.bar-link:hover { border-color: var(--m); color: #fff; }

.burger {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 8px 14px;
  border: 1px solid var(--m);
  border-radius: 4px;
  background: linear-gradient(180deg, rgba(255, 0, 255, 0.18), rgba(128, 0, 255, 0.18));
  color: #fff;
  font-family: inherit;
  font-size: 1rem;
  letter-spacing: 0.06em;
  cursor: pointer;
  box-shadow: 0 0 16px rgba(255, 0, 255, 0.28);
}

.burger-glyph { display: inline-flex; flex-direction: column; gap: 4px; width: 18px; }
.burger-glyph i { display: block; height: 2px; background: var(--m); box-shadow: 0 0 8px var(--m); }
.burger-glyph i:nth-child(2) { width: 70%; }

.burger[aria-expanded="true"] { background: var(--m); color: #100010; }
.burger[aria-expanded="true"] .burger-glyph i { background: #100010; box-shadow: none; }

/* ---------- 遮罩菜单 ---------- */
.overlay {
  position: fixed;
  inset: 0;
  z-index: 78;
  display: grid;
  place-items: center;
  padding: calc(var(--bar) + 24px) 22px;
  background:
    radial-gradient(circle at 82% 12%, rgba(255, 0, 255, 0.24), transparent 58%),
    radial-gradient(circle at 12% 88%, rgba(128, 0, 255, 0.28), transparent 60%),
    rgba(8, 6, 12, 0.98);
  transform: translateY(102%);
  visibility: hidden;
  transition: transform 0.46s cubic-bezier(0.22, 1, 0.36, 1), visibility 0.46s;
  overflow-y: auto;
}

.overlay.open { transform: translateY(0); visibility: visible; }

.overlay-nav ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
  counter-reset: ov;
}

.overlay-nav li {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.4s ease, transform 0.4s ease;
}

.overlay.open .overlay-nav li { opacity: 1; transform: none; }
.overlay.open .overlay-nav li:nth-child(1) { transition-delay: 0.06s; }
.overlay.open .overlay-nav li:nth-child(2) { transition-delay: 0.11s; }
.overlay.open .overlay-nav li:nth-child(3) { transition-delay: 0.16s; }
.overlay.open .overlay-nav li:nth-child(4) { transition-delay: 0.21s; }
.overlay.open .overlay-nav li:nth-child(5) { transition-delay: 0.26s; }
.overlay.open .overlay-nav li:nth-child(6) { transition-delay: 0.31s; }
.overlay.open .overlay-nav li:nth-child(7) { transition-delay: 0.36s; }

.overlay-nav a {
  display: block;
  padding: 12px 4px;
  min-height: 52px;
  font-size: clamp(1.28rem, 5vw, 2.1rem);
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--txt);
  border-bottom: 1px solid rgba(255, 0, 255, 0.16);
  counter-increment: ov;
}

.overlay-nav a::before {
  content: counter(ov, decimal-leading-zero) " ";
  font-size: 0.9rem;
  color: var(--v);
  letter-spacing: 0.1em;
  vertical-align: 0.5em;
}

.overlay-nav a:hover { color: #fff; }

/* ---------- 首屏 ---------- */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 96px 22px calc(var(--bar) + 62px);
  overflow: hidden;
  background:
    radial-gradient(circle at 76% 18%, rgba(128, 0, 255, 0.34), transparent 62%),
    radial-gradient(circle at 14% 82%, rgba(255, 0, 255, 0.2), transparent 58%),
    var(--ink);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 46px), 0 100%);
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background-image: radial-gradient(rgba(255, 0, 255, 0.26) 1px, transparent 1px);
  background-size: 20px 20px;
  opacity: 0.6;
}

.hero--inner { min-height: 74svh; }

.hero-media {
  position: absolute;
  inset: 0;
  z-index: 0;
  overflow: hidden;
}

.hero-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.5;
  transform: scale(1.06);
  will-change: transform;
  filter: saturate(1.2) contrast(1.05);
}

.hero-veil {
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(180deg, rgba(13, 13, 13, 0.45) 0%, rgba(13, 13, 13, 0.86) 78%, var(--ink) 100%);
}

.hero-text {
  position: relative;
  z-index: 2;
  margin-left: auto;
  max-width: 940px;
  text-align: right;
}

.hero h1 {
  margin: 0 0 18px;
  font-size: clamp(1.95rem, 8.6vw, 6.2rem);
  line-height: 1.06;
  font-weight: 700;
  letter-spacing: -0.025em;
  color: #fff;
  text-shadow:
    0 0 18px rgba(255, 0, 255, 0.6),
    0 0 52px rgba(128, 0, 255, 0.6);
  animation: glitch-shift 6s steps(1, end) infinite;
  overflow-wrap: break-word;
}

@keyframes glitch-shift {
  0%, 86%, 100% { transform: none; }
  88% { transform: skewX(-4deg) translateX(-3px); }
  91% { transform: skewX(3deg) translateX(3px); }
  94% { transform: none; }
}

.hero-desc {
  margin: 0 0 0 auto;
  max-width: 52ch;
  color: var(--dim);
  font-size: 1rem;
  line-height: 1.75;
}

/* ---------- 主体 ---------- */
.wrap {
  max-width: 1220px;
  margin: 0 auto;
  padding: 52px 22px 88px;
  display: grid;
  grid-template-columns: 224px minmax(0, 1fr);
  gap: 40px;
  align-items: start;
}

.side {
  position: sticky;
  top: 26px;
  align-self: start;
  padding-left: 16px;
  border-left: 1px solid var(--line);
}

.side h2 {
  margin: 0 0 6px;
  font-size: 1rem;
  letter-spacing: 0.24em;
  color: var(--m);
  font-weight: 600;
}

.side hr { margin: 0 0 12px; }

.side-list {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: sd;
}

.side-list li a {
  display: block;
  padding: 10px 0;
  min-height: 44px;
  color: var(--txt);
  font-size: 1rem;
  border-bottom: 1px dashed rgba(255, 0, 255, 0.16);
}

.side-list li a::before {
  counter-increment: sd;
  content: counter(sd, decimal-leading-zero) " ";
  color: var(--v);
  letter-spacing: 0.08em;
}

.side-list li a:hover { color: #fff; border-bottom-color: var(--m); }

.ledger { min-width: 0; }

.js div > article {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.js div > article.in { opacity: 1; transform: none; }

div > article {
  scroll-margin-top: 88px;
  padding-bottom: 8px;
}

div > article + article {
  margin-top: 56px;
  padding-top: 44px;
  border-top: 1px solid rgba(255, 0, 255, 0.16);
}

.prose h2 {
  position: relative;
  margin: 0 0 10px;
  padding-left: 16px;
  font-size: clamp(1.5rem, 3.4vw, 2.15rem);
  line-height: 1.28;
  letter-spacing: -0.012em;
  color: #fff;
}

.prose h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.2em;
  bottom: 0.2em;
  width: 3px;
  background: linear-gradient(180deg, var(--m), var(--v));
  box-shadow: 0 0 12px var(--m);
}

.prose h3 {
  margin: 30px 0 8px;
  font-size: 1.15rem;
  line-height: 1.5;
  color: #fff;
  letter-spacing: 0.01em;
}

.prose h3::before { content: "▍"; color: var(--v); margin-right: 4px; }

.prose p { margin: 0 0 16px; }

.prose ul,
.prose ol { margin: 0 0 18px; padding-left: 22px; }

.prose li { margin-bottom: 8px; }

.prose li::marker { color: var(--m); }

.prose strong { color: #fff; }

.prose a { border-bottom: 1px dotted var(--m); }

.prose blockquote {
  margin: 0 0 18px;
  padding: 12px 18px;
  border-left: 3px solid var(--v);
  background: rgba(128, 0, 255, 0.1);
  color: var(--dim);
}

.prose code {
  font-family: ui-monospace, 'SFMono-Regular', Menlo, Consolas, monospace;
  font-size: 0.94em;
  color: var(--m);
  background: rgba(255, 0, 255, 0.1);
  padding: 1px 5px;
  border-radius: 3px;
}

.prose table {
  width: 100%;
  max-width: 100%;
  border-collapse: collapse;
  margin: 0 0 20px;
  font-size: 1rem;
}

.prose th,
.prose td {
  border: 1px solid var(--line-soft);
  padding: 9px 12px;
  text-align: left;
  vertical-align: top;
}

.prose th { background: rgba(128, 0, 255, 0.16); color: #fff; }

.prose img { border-radius: 4px; margin: 6px 0 20px; box-shadow: 0 14px 34px rgba(0, 0, 0, 0.6), 0 0 0 1px var(--line-soft); }

/* ---------- 页脚 ---------- */
.foot {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: flex-start;
  gap: 30px;
  padding: 56px 22px calc(var(--bar) + 44px);
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(128, 0, 255, 0.1), transparent 62%);
}

.foot-brand { flex: 1 1 260px; min-width: 0; }

.foot-brand h2 {
  margin: 0 0 8px;
  font-size: clamp(2.1rem, 7.6vw, 4.8rem);
  line-height: 0.96;
  letter-spacing: -0.035em;
  font-weight: 700;
  color: transparent;
  -webkit-text-stroke: 1px var(--m);
  text-shadow: 0 0 26px rgba(255, 0, 255, 0.35);
  overflow-wrap: break-word;
}

.foot-nav { flex: 0 1 auto; }

.foot-nav dl {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 4px 14px;
  margin: 0;
}

.foot-nav dt {
  padding-top: 10px;
  font-size: 1rem;
  color: var(--v);
  letter-spacing: 0.1em;
}

.foot-nav dd { margin: 0; }

.foot-nav a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 8px 0;
  color: var(--txt);
  font-size: 1rem;
}

.foot-nav a:hover { color: #fff; }

.foot-copy {
  flex: 1 1 160px;
  text-align: right;
}

.foot-copy p {
  margin: 0;
  color: var(--dim);
  font-size: 1rem;
  letter-spacing: 0.04em;
}

/* ---------- 移动端 ---------- */
@media (max-width: 860px) {
  .wrap {
    grid-template-columns: 1fr;
    gap: 28px;
    padding-top: 34px;
  }

  .side {
    position: static;
    border-left: 0;
    border-top: 1px solid var(--line);
    padding: 16px 0 0;
  }

  .side-list { columns: 2; column-gap: 18px; }
  .side-list li { break-inside: avoid; }

  .foot { flex-direction: column; gap: 22px; }
  .foot-copy { text-align: left; }
  .foot-brand h2 { font-size: clamp(2.2rem, 12vw, 3.6rem); }
}

@media (max-width: 480px) {
  .bar { padding: 8px 14px; gap: 8px; }
  .bar-link { padding: 8px 10px; }
  .burger { padding: 8px 10px; }
  .burger-word { display: none; }
  .hero { padding-top: 84px; clip-path: polygon(0 0, 100% 0, 100% calc(100% - 30px), 0 100%); }
  .hero-desc { font-size: 1rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .hero h1 { animation: none; }
  .overlay,
  .overlay-nav li,
  .js div > article { transition: none; }
  .js div > article { opacity: 1; transform: none; }
  .hero-img { transform: none !important; }
}

button[aria-expanded]{min-width:44px;min-height:44px}