@import url('https://fonts.googleapis.com/css2?family=Chakra+Petch:wght@300;400;500;600;700&family=Russo+One&display=swap');

:root {
  --ink: #0B0E14;
  --cyan: #00E0C6;
  --magenta: #FF3D6E;
  --fg: #e9eef7;
  --dim: #8b98ab;
  --line: #1d2634;
  --panel: #0f141d;
  --r: 4px;
  --bar: 72px;
  --pad: clamp(18px, 6vw, 72px);
}

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

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

body {
  margin: 0;
  background: var(--ink);
  color: var(--fg);
  font: 400 17px/1.8 "Chakra Petch", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  letter-spacing: .01em;
  overflow-x: hidden;
  padding-bottom: calc(var(--bar) + env(safe-area-inset-bottom, 0px) + 16px);
}

h1, h2, h3 {
  font-family: "Russo One", "Chakra Petch", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  font-weight: 400;
  letter-spacing: .01em;
  word-break: break-word;
}

a { color: inherit; }

.skip {
  position: absolute;
  left: 12px;
  top: -60px;
  z-index: 90;
  padding: 10px 14px;
  background: var(--cyan);
  color: var(--ink);
  text-decoration: none;
  border-radius: var(--r);
  transition: top .2s ease;
}
.skip:focus { top: 12px; }

/* ---------- 视差底层 ---------- */
.bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
}
.bg-dots {
  position: absolute;
  inset: -25% -12%;
  background-image: radial-gradient(#243040 1px, transparent 1px);
  background-size: 28px 28px;
  opacity: .55;
  will-change: transform;
  transform: translate3d(0, calc(var(--sy, 0px) * .07), 0);
}
.bg-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(72px);
  will-change: transform;
}
.bg-glow-a {
  width: 58vw;
  height: 58vw;
  left: -12vw;
  top: -14vw;
  background: var(--cyan);
  opacity: .26;
  transform: translate3d(0, calc(var(--sy, 0px) * .2), 0);
}
.bg-glow-b {
  width: 50vw;
  height: 50vw;
  right: -12vw;
  top: 34vh;
  background: var(--magenta);
  opacity: .22;
  transform: translate3d(0, calc(var(--sy, 0px) * -.14), 0);
}
.bg-veil {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(11, 14, 20, .35) 0%, rgba(11, 14, 20, .78) 46%, var(--ink) 92%);
}

/* ---------- 底部固定导航 ---------- */
.dock {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 60;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px max(14px, env(safe-area-inset-left, 0px)) calc(10px + env(safe-area-inset-bottom, 0px));
  background: rgba(11, 14, 20, .93);
  border-top: 1px solid var(--line);
  backdrop-filter: blur(10px);
}
.dock-brand {
  flex: 0 0 auto;
  font-family: "Russo One", system-ui, sans-serif;
  font-size: 1.02rem;
  letter-spacing: .06em;
  text-decoration: none;
  color: var(--fg);
  white-space: nowrap;
  padding: 6px 2px;
}
.dock nav {
  flex: 1 1 auto;
  min-width: 0;
  overflow-x: auto;
  scrollbar-width: none;
}
.dock nav::-webkit-scrollbar { display: none; }
.dock ul {
  display: flex;
  align-items: center;
  gap: 4px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.dock a {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 0 11px;
  font-size: .95rem;
  white-space: nowrap;
  text-decoration: none;
  color: var(--dim);
  border: 1px solid transparent;
  border-radius: var(--r);
  transition: color .18s ease, border-color .18s ease, background .18s ease;
}
.dock a:hover,
.dock a:focus-visible,
.dock a[aria-current="true"] {
  color: var(--cyan);
  border-color: var(--line);
  background: var(--panel);
}

/* ---------- 首屏 ---------- */
.hero {
  position: relative;
  min-height: 70vh;
  display: flex;
  align-items: flex-end;
  justify-content: flex-end;
  padding: clamp(56px, 12vh, 130px) var(--pad) clamp(34px, 7vh, 70px);
  overflow: hidden;
}
.hero-tags {
  position: absolute;
  inset: 0;
  pointer-events: none;
  will-change: transform;
  transform: translate3d(0, calc(var(--sy, 0px) * .12), 0);
}
.hero-tags span {
  position: absolute;
  border: 1px solid var(--line);
  border-radius: 50%;
  opacity: .8;
}
.hero-tags span:nth-child(1) { width: 190px; height: 190px; left: 6%; top: 18%; border-color: #21303f; }
.hero-tags span:nth-child(2) { width: 92px; height: 92px; left: 30%; top: 56%; border-color: #2a3a4c; }
.hero-tags span:nth-child(3) { width: 14px; height: 14px; left: 18%; top: 40%; background: var(--cyan); border: 0; }
.hero-tags span:nth-child(4) { width: 10px; height: 10px; left: 46%; top: 24%; background: var(--magenta); border: 0; }
.hero-copy {
  position: relative;
  text-align: right;
  max-width: 22ch;
}
.hero-kicker {
  margin: 0 0 14px;
  color: var(--cyan);
  font-size: .9rem;
  letter-spacing: .38em;
  text-indent: .38em;
}
.hero h1 {
  margin: 0;
  font-size: clamp(2rem, 8vw, 5.4rem);
  line-height: 1.04;
  text-shadow: 0 0 40px rgba(0, 224, 198, .18);
}
.hero-cue {
  margin: 22px 0 0;
  font-size: .85rem;
  letter-spacing: .3em;
  color: var(--dim);
}
.hero-cue span { color: var(--magenta); }

/* ---------- 正文舞台 ---------- */
.stage { padding: 0 var(--pad); }
.chapter {
  position: relative;
  max-width: 1180px;
  margin: 0 auto;
  padding-top: clamp(22px, 5vw, 46px);
}
.chapter-ring {
  position: absolute;
  top: 0;
  right: 0;
  width: min(46vw, 320px);
  aspect-ratio: 1;
  margin: 0;
  border: 1px dashed #1f2b3a;
  border-radius: 50%;
  pointer-events: none;
  z-index: 0;
}
.chapter-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 250px;
  gap: clamp(26px, 5vw, 60px);
  align-items: start;
}

/* ---------- 正文样式 ---------- */
.prose { min-width: 0; font-size: 1.02rem; }
.prose > article {
  padding: clamp(38px, 6vw, 76px) 0;
  border-top: 1px solid var(--line);
  scroll-margin-top: 20px;
}
.prose > article:first-child {
  border-top: 0;
  padding-top: clamp(10px, 2vw, 20px);
}
.prose h2 {
  margin: 0 0 14px;
  font-size: clamp(1.5rem, 4.2vw, 2.3rem);
  line-height: 1.22;
  color: #fff;
}
.prose h2::after { content: ""; }
.prose h3 {
  margin: 30px 0 10px;
  font-size: clamp(1.15rem, 2.6vw, 1.4rem);
  color: var(--cyan);
}
.prose p { margin: 0 0 16px; max-width: 66ch; }
.prose ul,
.prose ol { margin: 0 0 18px; padding-left: 1.25em; }
.prose li { margin: 0 0 8px; }
.prose li::marker { color: var(--magenta); }
.prose a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}
.prose a:hover { color: var(--magenta); }
.prose strong { color: #fff; }
.prose hr {
  border: 0;
  height: 2px;
  width: 62px;
  margin: 14px 0 22px;
  background: linear-gradient(90deg, var(--cyan), transparent);
}
.prose figure {
  margin: 22px 0;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: rgba(15, 20, 29, .6);
}
.prose figcaption { color: var(--dim); font-size: .88rem; margin-top: 8px; }
.prose img { max-width: 100%; height: auto; border-radius: var(--r); display: block; }
.prose blockquote {
  margin: 22px 0;
  padding: 14px 18px;
  border: 1px solid var(--line);
  border-left: 2px solid var(--magenta);
  border-radius: var(--r);
  color: #cfd8e6;
  background: rgba(255, 61, 110, .05);
}
.prose blockquote p:last-child { margin-bottom: 0; }
.prose ul li,
.prose ol li { max-width: 64ch; }
.prose table { display: block; overflow-x: auto; border-collapse: collapse; }
.prose th,
.prose td { border: 1px solid var(--line); padding: 8px 12px; text-align: left; }

/* ---------- 右侧栏 ---------- */
.rail {
  position: sticky;
  top: 24px;
  padding-left: 18px;
  border-left: 1px solid var(--line);
}
.rail h2 {
  margin: 0 0 12px;
  font-size: 1.05rem;
  letter-spacing: .08em;
  color: #fff;
}
.rail hr {
  border: 0;
  height: 2px;
  width: 40px;
  margin: 0 0 16px;
  background: var(--magenta);
}
.rail-list {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: rail;
}
.rail-list li { margin: 0 0 2px; }
.rail-list a {
  display: flex;
  gap: 10px;
  align-items: baseline;
  min-height: 40px;
  align-items: center;
  padding: 6px 8px 6px 0;
  font-size: .93rem;
  color: var(--dim);
  text-decoration: none;
  border-bottom: 1px solid rgba(29, 38, 52, .7);
  transition: color .16s ease, padding-left .16s ease;
}
.rail-list a:hover {
  color: var(--cyan);
  padding-left: 6px;
}
.rail-list .num {
  font-family: "Russo One", system-ui, sans-serif;
  font-size: .74rem;
  color: #3a475a;
}

/* ---------- 页脚 ---------- */
.foot {
  margin-top: clamp(48px, 9vw, 100px);
  padding: clamp(30px, 6vw, 56px) var(--pad) 30px;
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(15, 20, 29, .2), rgba(0, 224, 198, .05));
  display: grid;
  gap: 26px;
}
.foot article { min-width: 0; }
.foot-word p {
  margin: 0;
  font-family: "Russo One", "PingFang SC", system-ui, sans-serif;
  font-size: clamp(2.4rem, 12vw, 5.6rem);
  line-height: .92;
  letter-spacing: .02em;
  color: #16202e;
  -webkit-text-stroke: 1px #2b3a4d;
}
.foot-links ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
}
.foot-links a {
  display: inline-block;
  padding: 8px 0;
  min-height: 40px;
  font-size: .92rem;
  color: var(--dim);
  text-decoration: none;
}
.foot-links a:hover { color: var(--cyan); }
.foot-meta {
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: flex-start;
}
.foot-meta .copy {
  margin: 0;
  font-size: .82rem;
  color: #5d6a7d;
  letter-spacing: .04em;
}
.foot-meta .top {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0 12px;
  font-size: .82rem;
  color: var(--cyan);
  text-decoration: none;
  border: 1px solid var(--line);
  border-radius: var(--r);
}
.foot-meta .top:hover { border-color: var(--cyan); }

/* ---------- 滚动显现 ---------- */
@media (prefers-reduced-motion: no-preference) {
  .js .prose > article {
    opacity: 0;
    transform: translateY(26px);
    transition: opacity .7s ease, transform .7s cubic-bezier(.2, .7, .2, 1);
  }
  .js .prose > article.in {
    opacity: 1;
    transform: none;
  }
  .js .prose > article:nth-child(2) { transition-delay: .05s; }
  .js .prose > article:nth-child(3) { transition-delay: .09s; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .prose > article { opacity: 1; transform: none; }
  .bg-dots, .bg-glow, .hero-tags { transform: none !important; }
}

/* ---------- 断点 ---------- */
@media (max-width: 900px) {
  .chapter-grid { grid-template-columns: minmax(0, 1fr); }
  .rail {
    position: static;
    padding-left: 0;
    border-left: 0;
    border-top: 1px solid var(--line);
    padding-top: 22px;
    margin-top: 8px;
  }
  .rail-list a { min-height: 44px; }
  .chapter-ring { width: 62vw; opacity: .6; top: 6px; }
}

@media (max-width: 520px) {
  :root { --bar: 68px; }
  body { font-size: 16px; }
  .dock-brand { font-size: .95rem; }
  .dock a { padding: 0 9px; font-size: .9rem; }
  .hero { min-height: 66vh; }
  .hero h1 { font-size: clamp(1.9rem, 9vw, 2.6rem); }
  .hero-kicker { letter-spacing: .26em; font-size: .8rem; }
  .foot { gap: 20px; }
}

@media (min-width: 860px) {
  .foot { grid-template-columns: 1.5fr .9fr 1fr; align-items: end; }
  .foot-meta { align-items: flex-end; }
}

@media (hover: hover) {
  .prose > article:hover { border-top-color: #26364a; }
}

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