:root {
  --red: #ff0000;
  --violet: #8b00ff;
  --ink: #261717;
  --txt: #f7eef0;
  --dim: #cdbbc1;
  --glass: rgba(255, 255, 255, 0.08);
  --glass-2: rgba(255, 255, 255, 0.14);
  --line: rgba(255, 255, 255, 0.2);
  --rail: 216px;
}

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

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

body {
  margin: 0;
  overflow-x: clip;
  min-height: 100vh;
  background-color: var(--ink);
  background-image:
    radial-gradient(62vw 62vw at 10% 6%, rgba(139, 0, 255, 0.42), transparent 62%),
    radial-gradient(58vw 58vw at 90% 80%, rgba(255, 0, 0, 0.4), transparent 60%),
    radial-gradient(42vw 42vw at 74% 14%, rgba(255, 0, 0, 0.18), transparent 66%),
    radial-gradient(50vw 50vw at 30% 96%, rgba(139, 0, 255, 0.24), transparent 64%);
  background-attachment: fixed;
  color: var(--txt);
  font-family: 'Space Mono', ui-monospace, 'Courier New', monospace;
  font-size: 17px;
  line-height: 1.75;
  letter-spacing: 0.02em;
}

h1,
h2,
h3,
h4 {
  font-family: 'Syncopate', 'Space Mono', ui-monospace, sans-serif;
  line-height: 1.16;
  letter-spacing: 0.07em;
  overflow-wrap: anywhere;
}

a { color: inherit; }

:focus-visible {
  outline: 2px solid var(--red);
  outline-offset: 2px;
}

/* ---------- 侧栏 ---------- */
.rail {
  position: fixed;
  inset: 0 auto 0 0;
  width: var(--rail);
  z-index: 30;
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 26px 16px;
  overflow-y: auto;
  border-right: 1px solid var(--line);
  background: rgba(38, 23, 23, 0.55);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
  backdrop-filter: blur(18px) saturate(140%);
}

.brand {
  display: block;
  padding: 8px 4px;
  text-decoration: none;
  color: #fff;
  border-bottom: 1px solid var(--line);
}

.brand-logo {
  display: block;
  max-width: 100%;
  height: auto;
}

.brand-txt {
  font-family: 'Syncopate', sans-serif;
  font-size: 16px;
  letter-spacing: 0.22em;
}

.pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 14px;
  border: 1px solid var(--line);
  background: var(--glass);
  color: var(--txt);
  font: inherit;
  font-size: 16px;
  text-decoration: none;
  cursor: pointer;
  border-radius: 0;
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  transition: background 0.25s ease, border-color 0.25s ease, color 0.25s ease;
}

.pill:hover,
.pill:focus-visible {
  background: rgba(255, 0, 0, 0.34);
  border-color: rgba(255, 255, 255, 0.55);
  color: #fff;
}

.pill-contact {
  border-color: rgba(139, 0, 255, 0.65);
  background: rgba(139, 0, 255, 0.2);
}

.rail-nav ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.rail-nav .pill { width: 100%; }

.to-top { margin-top: auto; }

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

.wrap {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 262px;
  gap: 30px 44px;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 36px;
}

.hero {
  grid-column: 1 / -1;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 64px 0 48px;
}

.hero-body { width: 100%; }

.hero h1 {
  margin: 0 0 18px;
  font-size: clamp(2rem, 5.8vw, 3.6rem);
  text-shadow: 0 2px 40px rgba(255, 0, 0, 0.45);
}

.hero-desc {
  max-width: 44ch;
  margin: 0 auto;
  color: var(--dim);
  font-size: 17px;
}

.hero-media {
  max-width: 780px;
  margin: 38px auto 0;
  padding: 10px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--glass);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
}

.hero-pic {
  display: block;
  width: 100%;
  height: auto;
  will-change: transform;
}

/* ---------- 正文 ---------- */
.body-col {
  grid-column: 1;
  min-width: 0;
  padding-bottom: 40px;
}

.body-col article {
  scroll-margin-top: 30px;
  margin: 0 0 26px;
  padding: 42px 30px;
  border: 1px solid var(--line);
  background: var(--glass);
  -webkit-backdrop-filter: blur(15px) saturate(130%);
  backdrop-filter: blur(15px) saturate(130%);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.14) inset, 0 24px 60px -32px rgba(0, 0, 0, 0.7);
}

.body-col article:first-child { margin-top: 8px; }

.body-col h2 {
  margin: 0 0 14px;
  padding-left: 16px;
  border-left: 3px solid var(--red);
  font-size: clamp(1.3rem, 2.4vw, 1.72rem);
}

.body-col h3 {
  margin: 28px 0 10px;
  font-size: 1.16rem;
  color: #fff;
}

.body-col h4 {
  margin: 22px 0 8px;
  font-size: 1rem;
  letter-spacing: 0.1em;
}

.body-col p { margin: 0 0 16px; }

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

.body-col li { margin: 0 0 9px; }

.body-col strong,
.body-col b { color: #fff; }

.body-col a {
  color: #ff9292;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.body-col a:hover { color: #fff; }

.body-col blockquote {
  margin: 0 0 18px;
  padding: 14px 18px;
  border-left: 2px solid var(--violet);
  background: rgba(139, 0, 255, 0.16);
  color: var(--dim);
}

.body-col img {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 0 0 18px;
}

.body-col figure { margin: 0 0 18px; }

.body-col hr {
  margin: 26px 0;
  border: 0;
  border-top: 1px solid var(--line);
}

.body-col table {
  width: 100%;
  border-collapse: collapse;
  margin: 0 0 18px;
  font-size: 16px;
}

.body-col th,
.body-col td {
  padding: 10px 12px;
  border: 1px solid var(--line);
  text-align: left;
  overflow-wrap: anywhere;
}

.body-col th { background: rgba(255, 255, 255, 0.08); }

/* ---------- 侧注 ---------- */
.side {
  grid-column: 2;
  align-self: start;
  position: sticky;
  top: 32px;
  padding: 22px 20px;
  border: 1px solid rgba(139, 0, 255, 0.55);
  background: rgba(139, 0, 255, 0.16);
  -webkit-backdrop-filter: blur(15px) saturate(130%);
  backdrop-filter: blur(15px) saturate(130%);
}

.side h2 {
  margin: 0 0 6px;
  font-size: 1.05rem;
  letter-spacing: 0.14em;
}

.subtitle {
  margin: 0 0 14px;
  color: var(--dim);
  font-size: 16px;
}

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

.side a {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 6px 2px;
  font-size: 16px;
  text-decoration: none;
  color: var(--txt);
  border-bottom: 1px solid rgba(255, 255, 255, 0.13);
}

.side li:last-child a { border-bottom: 0; }

.side a:hover,
.side a:focus-visible { color: #fff; border-bottom-color: var(--red); }

/* ---------- 页脚 ---------- */
.foot {
  margin-left: var(--rail);
  padding: 44px 36px 64px;
}

.foot p {
  max-width: 1180px;
  margin: 0 auto 14px;
}

.foot-cta {
  display: flex;
  justify-content: center;
  padding: 58px 20px;
  border: 1px solid var(--line);
  background: linear-gradient(118deg, rgba(255, 0, 0, 0.28), rgba(139, 0, 255, 0.3));
  -webkit-backdrop-filter: blur(18px);
  backdrop-filter: blur(18px);
  text-align: center;
}

.foot-cta a {
  font-family: 'Syncopate', sans-serif;
  font-size: clamp(1.5rem, 4.4vw, 2.6rem);
  letter-spacing: 0.16em;
  text-decoration: none;
  color: #fff;
}

.foot-cta a:hover { text-shadow: 0 0 26px rgba(255, 0, 0, 0.9); }

.foot small {
  display: block;
  max-width: 1180px;
  margin: 0 auto;
  color: var(--dim);
  font-size: 16px;
  letter-spacing: 0.12em;
}

/* ---------- 动效 ---------- */
.js .reveal {
  opacity: 0;
  transform: translate3d(0, 18px, 0);
  transition: opacity 0.7s ease, transform 0.7s cubic-bezier(0.22, 0.61, 0.36, 1);
}

.js .reveal.in {
  opacity: 1;
  transform: none;
}

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

/* ---------- 窄屏 ---------- */
@media (max-width: 900px) {
  body { padding-top: 66px; }

  .rail {
    inset: 0 0 auto 0;
    width: auto;
    flex-direction: row;
    align-items: center;
    gap: 8px;
    padding: 10px 12px;
    overflow: visible;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .brand {
    flex: 0 0 auto;
    padding: 4px;
    border-bottom: 0;
  }

  .brand-logo { max-height: 34px; width: auto; }
  .brand-txt { font-size: 15px; letter-spacing: 0.16em; }

  .pill-contact { flex: 0 0 auto; padding: 0 12px; }

  .rail-nav {
    flex: 1 1 auto;
    min-width: 0;
    overflow-x: auto;
    overflow-y: hidden;
    -webkit-overflow-scrolling: touch;
  }

  .rail-nav ol {
    flex-direction: row;
    gap: 6px;
    padding-bottom: 2px;
  }

  .rail-nav .pill {
    width: auto;
    white-space: nowrap;
  }

  .to-top { display: none; }

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

  .wrap {
    grid-template-columns: minmax(0, 1fr);
    gap: 22px;
    padding: 0 16px;
  }

  .hero {
    min-height: calc(100svh - 66px);
    padding: 40px 0 30px;
  }

  .hero-media { margin-top: 26px; padding: 6px; }

  .body-col { grid-column: 1; padding-bottom: 22px; }

  .body-col article {
    padding: 30px 18px;
    scroll-margin-top: 84px;
  }

  .side {
    grid-column: 1;
    position: static;
    order: 3;
  }

  .foot { padding: 30px 16px 52px; }

  .foot-cta { padding: 42px 14px; }
}

@media (max-width: 420px) {
  .hero h1 { font-size: 1.85rem; }
  .body-col article { padding: 26px 15px; }
}

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