@import url('https://fonts.googleapis.com/css2?family=Exo+2:wght@300;400;500;600;700&family=Orbitron:wght@400;500;600;700&display=swap');

:root {
  --bg: #000000;
  --panel: #121212;
  --panel-2: #0a0a0a;
  --line: #232323;
  --line-soft: #1a1a1a;
  --ink: #e9edf2;
  --dim: #9aa4ae;
  --neon: #00e6a8;
  --blue: #4aa8ff;
  --gold: #ffd166;
  --purple: #b388ff;
  --rail: 264px;
  --r: 10px;
  color-scheme: dark;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Exo 2", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  font-size: 17px;
  line-height: 1.78;
  letter-spacing: .01em;
  overflow-x: hidden;
  min-height: 100vh;
}

::selection { background: rgba(0, 230, 168, .28); color: #fff; }

a { color: var(--neon); text-decoration: none; }
a:hover { color: #fff; }

a:focus-visible,
label:focus-visible,
input:focus-visible + label {
  outline: 2px solid var(--neon);
  outline-offset: 3px;
  border-radius: 8px;
}

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

/* ---------- 左侧固定竖排导航 ---------- */
.rail {
  position: fixed;
  inset: 0 auto 0 0;
  width: var(--rail);
  z-index: 40;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 30px 18px 34px;
  background: linear-gradient(180deg, #070707 0%, #000 46%, #000 100%);
  border-right: 1px solid var(--line);
  overflow-y: auto;
}

.rail::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: radial-gradient(circle at 1px 1px, rgba(0, 230, 168, .14) 1px, transparent 1px);
  background-size: 18px 18px;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 62%);
  mask-image: linear-gradient(180deg, #000 0%, transparent 62%);
}

.rail-top { position: relative; }

.brand {
  display: block;
  padding: 8px 2px 16px;
  font-family: Orbitron, "Exo 2", "PingFang SC", system-ui, sans-serif;
  font-size: 18px;
  font-weight: 600;
  letter-spacing: .14em;
  color: #fff;
  border-bottom: 1px solid var(--line);
  text-shadow: 0 0 12px rgba(0, 230, 168, .45);
}

.brand:hover { color: var(--neon); }

.rail-label {
  position: relative;
  margin: 10px 0 2px;
  font-size: 16px;
  font-weight: 500;
  letter-spacing: .22em;
  color: var(--dim);
}

.rail-label > span { display: inline-block; }

.navtoggle {
  position: absolute;
  opacity: 0;
  width: 1px;
  height: 1px;
  pointer-events: none;
}

.burger {
  display: none;
  align-items: center;
  min-height: 44px;
  padding: 0 16px;
  border: 1px solid var(--line);
  border-radius: var(--r);
  color: var(--ink);
  font-size: 16px;
  cursor: pointer;
}

.rail-nav { position: relative; }

.rail-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.rail-nav li { position: relative; }

.rail-nav a {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 8px 12px;
  color: #d4dae0;
  font-size: 16px;
  line-height: 1.4;
  border-left: 2px solid transparent;
  border-radius: 0 8px 8px 0;
  transition: color .2s ease, background .2s ease, border-color .2s ease;
}

.rail-nav a:hover,
.rail-nav a:focus-visible {
  color: #fff;
  background: #0f1514;
  border-left-color: var(--neon);
}

.rail-nav .g > a {
  font-weight: 500;
  letter-spacing: .04em;
}

.rail-nav .g > a::after {
  content: "";
  margin-left: auto;
  width: 6px;
  height: 6px;
  border-right: 1px solid var(--dim);
  border-bottom: 1px solid var(--dim);
  transform: rotate(45deg) translateY(-2px);
  opacity: .8;
}

.rail-nav .drop {
  display: none;
  margin: 2px 0 8px;
  padding-left: 10px;
  border-left: 1px dashed #1f2b28;
}

.rail-nav .drop a {
  min-height: 42px;
  font-size: 16px;
  color: var(--dim);
}

.rail-nav .g:hover > .drop,
.rail-nav .g:focus-within > .drop { display: block; }

/* ---------- 主区 ---------- */
main { margin-left: var(--rail); }

/* ---------- 首屏 ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100svh;
  display: grid;
  align-items: center;
  padding: 110px clamp(22px, 4vw, 72px) 96px clamp(26px, 24vw, 300px);
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(ellipse at 78% 18%, rgba(74, 168, 255, .10), transparent 58%),
    radial-gradient(ellipse at 12% 82%, rgba(179, 136, 255, .09), transparent 62%),
    #000;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 1px 1px, rgba(0, 230, 168, .17) 1px, transparent 1px),
    linear-gradient(90deg, rgba(74, 168, 255, .07), transparent 62%);
  background-size: 22px 22px, 100% 100%;
  -webkit-mask-image: radial-gradient(ellipse at 32% 42%, #000 12%, transparent 76%);
  mask-image: radial-gradient(ellipse at 32% 42%, #000 12%, transparent 76%);
  pointer-events: none;
}

.collage {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
}

.frame {
  position: absolute;
  overflow: hidden;
  border: 1px solid #1d2a28;
  border-radius: var(--r);
  background:
    linear-gradient(135deg, #0b1110 0%, #0a0d12 60%, #08090b 100%);
  box-shadow: inset 0 0 0 1px #0b1211, 0 18px 40px rgba(0, 0, 0, .8);
  transition: box-shadow .9s ease, border-color .9s ease, transform .9s ease;
}

.frame .shot {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(.92) contrast(1.06) brightness(.94);
}

.frame.fa {
  width: min(32vw, 286px);
  aspect-ratio: 3 / 4;
  left: clamp(16px, 4vw, 76px);
  top: 14%;
  transform: rotate(-3deg);
}

.frame.fb {
  width: min(28vw, 244px);
  aspect-ratio: 4 / 5;
  left: clamp(120px, 17vw, 290px);
  top: 44%;
  border-color: #1c2733;
  transform: rotate(2.6deg);
}

.frame.lit {
  border-color: rgba(0, 230, 168, .7);
  box-shadow: inset 0 0 0 1px #0d1614, 0 0 22px rgba(0, 230, 168, .28), 0 18px 40px rgba(0, 0, 0, .85);
}

.hero-copy {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: 640px;
  margin-left: auto;
  text-align: right;
}

.warp {
  margin: 0 0 12px;
  font-family: Orbitron, "Exo 2", "PingFang SC", system-ui, sans-serif;
  font-size: clamp(16px, 1.4vw, 19px);
  font-weight: 500;
  letter-spacing: .34em;
  color: var(--neon);
  text-shadow: 0 0 10px rgba(0, 230, 168, .5);
}

.warp > span { display: inline-block; }

.hero h1 {
  margin: 0 0 20px;
  font-family: Orbitron, "Exo 2", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  font-size: clamp(30px, 4.4vw, 54px);
  font-weight: 600;
  line-height: 1.24;
  letter-spacing: .02em;
  color: #fff;
  text-shadow: 0 0 22px rgba(74, 168, 255, .22);
}

.lede {
  margin: 0 0 0 auto;
  max-width: 46ch;
  color: var(--dim);
  font-size: 17px;
  line-height: 1.8;
}

/* ---------- 正文骨架 ---------- */
.wrap {
  max-width: 1080px;
  margin: 0 auto;
  padding: clamp(40px, 6vw, 76px) clamp(16px, 3vw, 34px) clamp(56px, 7vw, 92px);
}

.body-shell { position: relative; }

.prose {
  max-width: 74ch;
  margin: 0 auto;
}

.prose > div {
  position: relative;
  margin: 0 0 18px;
  padding: clamp(22px, 3.4vw, 40px);
  background: linear-gradient(180deg, #0c0c0c 0%, var(--panel) 62%, #0d0d0d 100%);
  border: 1px solid var(--line-soft);
  border-bottom: 2px solid rgba(0, 230, 168, .34);
  border-radius: var(--r);
  scroll-margin-top: 26px;
}

.prose > div::after {
  content: "";
  position: absolute;
  left: clamp(22px, 3.4vw, 40px);
  bottom: -2px;
  width: 52px;
  height: 2px;
  background: var(--neon);
  box-shadow: 0 0 10px rgba(0, 230, 168, .8);
}

.prose h2,
.prose h3 {
  margin: 0 0 .7em;
  line-height: 1.32;
  color: #fff;
  letter-spacing: .02em;
}

.prose h2 {
  font-family: Orbitron, "Exo 2", "PingFang SC", system-ui, sans-serif;
  font-size: clamp(21px, 2.5vw, 27px);
  font-weight: 600;
}

.prose h3 {
  font-size: clamp(18px, 2vw, 21px);
  font-weight: 600;
  color: #eef2f6;
}

.prose h2 > span,
.prose h3 > span,
h2 > span {
  display: inline-block;
  position: relative;
}

.prose h2 > span::after {
  content: "";
  position: absolute;
  left: 0;
  right: -4px;
  bottom: -8px;
  height: 2px;
  background: linear-gradient(90deg, var(--blue), rgba(74, 168, 255, 0));
}

.prose h2 + p,
.prose h3 + p { margin-top: 1.1em; }

.prose p {
  margin: 0 0 1em;
  color: #c7cdd4;
  font-size: 17px;
  line-height: 1.86;
}

.prose strong { color: #fff; font-weight: 600; }

.prose a {
  color: var(--neon);
  border-bottom: 1px solid rgba(0, 230, 168, .4);
}

.prose a:hover { color: #fff; border-bottom-color: #fff; }

.prose ul,
.prose ol {
  margin: 0 0 1.1em;
  padding-left: 22px;
  color: #c7cdd4;
}

.prose li { margin: 0 0 .45em; line-height: 1.78; }

.prose ul li::marker { color: var(--neon); }
.prose ol li::marker { color: var(--gold); font-variant-numeric: tabular-nums; }

.prose blockquote {
  margin: 0 0 1.1em;
  padding: 12px 18px;
  border-left: 2px solid var(--purple);
  background: #0e0d14;
  border-radius: 0 var(--r) var(--r) 0;
  color: #c9c6d6;
}

.prose blockquote p:last-child { margin-bottom: 0; }

.prose table {
  display: block;
  width: 100%;
  margin: 0 0 1.2em;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--r);
  border-collapse: collapse;
  font-size: 16px;
}

.prose th,
.prose td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--line-soft);
  text-align: left;
  white-space: nowrap;
}

.prose th { color: var(--gold); font-weight: 600; background: #101010; }

.prose figure { margin: 0 0 1.2em; }
.prose figure img { border-radius: var(--r); border: 1px solid var(--line); }

.prose code,
.prose pre {
  font-family: "JetBrains Mono", ui-monospace, Menlo, Consolas, monospace;
  font-size: 15px;
}

.prose pre {
  overflow-x: auto;
  padding: 14px 16px;
  background: #0b0b0b;
  border: 1px solid var(--line);
  border-radius: var(--r);
}

/* ---------- 页脚（仅 p + small） ---------- */
.base {
  margin-left: var(--rail);
  padding: 40px 20px 60px;
  text-align: center;
  background: #040404;
  border-top: 1px solid var(--line);
}

.base p {
  margin: 0 0 12px;
  color: #d3d9df;
  font-size: 16px;
  letter-spacing: .04em;
}

.base small {
  display: block;
  font-size: 16px;
  color: var(--dim);
}

.base small a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 18px;
  border: 1px solid var(--line);
  border-radius: var(--r);
  color: var(--neon);
  letter-spacing: .08em;
  transition: border-color .2s ease, color .2s ease, box-shadow .2s ease;
}

.base small a:hover {
  color: #fff;
  border-color: var(--neon);
  box-shadow: 0 0 14px rgba(0, 230, 168, .3);
}

/* ---------- 滚动显现 ---------- */
html.js .rv {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity .62s ease, transform .62s ease;
}

html.js .rv.in {
  opacity: 1;
  transform: none;
}

.frame.rv.in.fa { transform: rotate(-3deg); }
.frame.rv.in.fb { transform: rotate(2.6deg); }

/* ---------- 移动端 ---------- */
@media (max-width: 900px) {
  :root { --rail: 0px; }

  .rail {
    position: sticky;
    top: 0;
    inset: auto;
    width: auto;
    height: auto;
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
    padding: 10px 14px;
    background: #000;
    border-right: 0;
    border-bottom: 1px solid var(--line);
    overflow: visible;
  }

  .rail::before { display: none; }

  .rail-top { flex: 1 1 auto; min-width: 0; }

  .brand {
    padding: 4px 0;
    font-size: 17px;
    letter-spacing: .1em;
    border-bottom: 0;
    white-space: nowrap;
  }

  .burger { display: inline-flex; }

  .rail-label { display: none; }

  .rail-nav {
    display: none;
    width: 100%;
    order: 4;
    padding: 6px 0 10px;
    border-top: 1px solid var(--line-soft);
    margin-top: 6px;
  }

  .navtoggle:checked ~ .rail-nav { display: block; }

  .rail-nav .drop {
    display: block;
    margin: 0 0 4px 12px;
  }

  main,
  .base { margin-left: 0; }

  .hero {
    min-height: 100svh;
    display: block;
    padding: 44px 18px 60px;
  }

  .hero-copy {
    max-width: none;
    text-align: left;
  }

  .warp { margin-bottom: 10px; letter-spacing: .24em; }

  .hero h1 { font-size: clamp(28px, 8vw, 38px); }

  .lede { max-width: none; margin: 0; }

  .collage { opacity: .34; }

  .frame.fa {
    width: 52vw;
    left: auto;
    right: -6vw;
    top: auto;
    bottom: 8vh;
  }

  .frame.fb {
    width: 40vw;
    left: 6vw;
    top: auto;
    bottom: 3vh;
  }

  .prose { max-width: none; }

  .prose > div { padding: 20px 16px; }

  .prose > div::after { left: 16px; }

  .prose table { font-size: 16px; }
}

@media (min-width: 901px) {
  .navtoggle { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  html.js .rv {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
  .frame { transition: none; }
}

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