@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:ital,wght@0,400;0,500;1,400&display=swap');

:root {
  --ink: #261717;
  --ink-lo: #180c0c;
  --red: #ff0000;
  --pink: #ff1493;
  --fg: #ffeef3;
  --dim: #dcbfc8;
  --line: rgba(255, 20, 147, .24);
  --glass: rgba(255, 255, 255, .055);
  --r: 18px;
}

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

html {
  scroll-behavior: smooth;
  background: var(--ink-lo);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100%;
  position: relative;
  overflow-x: hidden;
  background: var(--ink);
  color: var(--fg);
  font: 400 16px/1.65 "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  -webkit-font-smoothing: antialiased;
}

body::before {
  content: "";
  position: fixed;
  inset: -25%;
  z-index: 0;
  pointer-events: none;
  opacity: .92;
  background:
    radial-gradient(36% 40% at 16% 20%, rgba(255, 0, 0, .62), transparent 68%),
    radial-gradient(32% 36% at 80% 12%, rgba(255, 20, 147, .55), transparent 70%),
    radial-gradient(44% 48% at 64% 82%, rgba(255, 20, 147, .34), transparent 72%),
    radial-gradient(30% 32% at 28% 92%, rgba(255, 0, 0, .3), transparent 74%);
  filter: saturate(1.2) blur(38px);
  animation: aurora 11s ease-in-out infinite alternate;
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(255, 255, 255, .035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .035) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: radial-gradient(circle at 50% 30%, #000, transparent 88%);
  mask-image: radial-gradient(circle at 50% 30%, #000, transparent 88%);
}

@keyframes aurora {
  0% { transform: translate3d(-2%, -1%, 0) scale(1.05); filter: saturate(1.12) blur(38px); }
  50% { transform: translate3d(2%, 2%, 0) scale(1.13); filter: saturate(1.32) blur(46px); }
  100% { transform: translate3d(-1%, 3%, 0) scale(1.06); filter: saturate(1.2) blur(40px); }
}

@keyframes rise {
  from { opacity: 0; transform: translateY(18px); }
  to { opacity: 1; transform: none; }
}

@keyframes fade {
  from { opacity: 0; }
  to { opacity: 1; }
}

main,
footer { position: relative; z-index: 1; }

img { max-width: 100%; }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- 左侧竖排导轨 ---------- */
.rail {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: 240px;
  z-index: 30;
  display: flex;
  flex-direction: column;
  gap: 26px;
  padding: 22px 16px 26px;
  border-right: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(38, 23, 23, .88), rgba(24, 12, 12, .82));
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
}

.brand {
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  border-radius: 13px;
  border: 1px solid rgba(255, 255, 255, .16);
  background: linear-gradient(135deg, rgba(255, 0, 0, .75), rgba(255, 20, 147, .8));
  color: #fff;
  text-decoration: none;
  box-shadow: 0 10px 26px -14px rgba(255, 0, 0, .9);
}

.brand img { display: block; border-radius: 8px; }

.mark-t { font-size: 19px; font-weight: 500; letter-spacing: .04em; }

.rail-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.rail-nav a {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  padding: 10px 11px;
  border-radius: 12px;
  color: var(--dim);
  font-size: 16px;
  line-height: 1.3;
  text-decoration: none;
  border: 1px solid transparent;
  transition: color .25s, background .25s, border-color .25s;
}

.rail-nav .ico {
  width: 14px;
  height: 14px;
  flex: 0 0 14px;
  opacity: .7;
  transition: opacity .25s, transform .3s;
}

.rail-nav a:hover,
.rail-nav a:focus-visible {
  color: #fff;
  background: var(--glass);
  border-color: var(--line);
}

.rail-nav a:hover .ico { opacity: 1; transform: rotate(45deg); }

.rail-nav a.on {
  color: #fff;
  background: linear-gradient(100deg, rgba(255, 0, 0, .28), rgba(255, 20, 147, .24));
  border-color: var(--line);
}

.rail-nav a.on .ico { opacity: 1; }

/* ---------- 首屏 ---------- */
main { padding-left: 240px; }

.hero { position: relative; }

.hero-fig {
  position: relative;
  margin: 0;
  min-height: 100svh;
  display: flex;
  align-items: flex-end;
  justify-content: flex-end;
  overflow: hidden;
  animation: fade 1s ease both;
}

.hero-fig.bare {
  background:
    radial-gradient(60% 70% at 80% 20%, rgba(255, 20, 147, .5), transparent 70%),
    radial-gradient(50% 60% at 20% 70%, rgba(255, 0, 0, .42), transparent 72%),
    linear-gradient(200deg, #3a1418, #261717 58%, #3d1030);
}

.hero-img {
  position: absolute;
  inset: -8% 0;
  width: 100%;
  height: 116%;
  object-fit: cover;
  filter: saturate(1.15) contrast(1.05);
  will-change: transform;
  transform: scale(1.08);
}

.hero-fig::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(258deg, rgba(24, 12, 12, .95) 6%, rgba(24, 12, 12, .62) 44%, rgba(24, 12, 12, .2) 100%),
    radial-gradient(60% 60% at 88% 88%, rgba(255, 20, 147, .38), transparent 72%);
}

.hero-cap {
  position: relative;
  z-index: 2;
  text-align: right;
  max-width: min(700px, 90%);
  padding: 0 56px 12vh 24px;
}

.hero-cap h1 {
  margin: 0 0 16px;
  font-size: clamp(30px, 4.6vw, 58px);
  line-height: 1.14;
  letter-spacing: -.02em;
  background: linear-gradient(100deg, #fff, #ffd2dd 42%, var(--pink));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-desc {
  margin: 0;
  font-size: 17px;
  line-height: 1.7;
  color: var(--dim);
  margin-left: auto;
  max-width: 46ch;
}

/* ---------- 正文与右侧栏 ---------- */
.shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 262px;
  gap: 34px;
  align-items: start;
  max-width: 1240px;
  margin: 0 auto;
  padding: 64px 48px 72px 40px;
}

.prose {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.prose > div {
  scroll-margin-top: 96px;
  padding: 30px 32px;
  border-radius: var(--r);
  border: 1px solid var(--line);
  background: var(--glass);
  -webkit-backdrop-filter: blur(13px) saturate(1.1);
  backdrop-filter: blur(13px) saturate(1.1);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, .07),
    0 22px 46px -34px rgba(0, 0, 0, .95);
  animation: rise .7s cubic-bezier(.2, .7, .3, 1) both;
}

.prose > div:nth-child(1) { animation-delay: .04s; }
.prose > div:nth-child(2) { animation-delay: .1s; }
.prose > div:nth-child(3) { animation-delay: .16s; }
.prose > div:nth-child(4) { animation-delay: .22s; }
.prose > div:nth-child(5) { animation-delay: .28s; }
.prose > div:nth-child(6) { animation-delay: .34s; }
.prose > div:nth-child(7) { animation-delay: .4s; }

.prose h2 {
  margin: 0 0 16px;
  font-size: clamp(20px, 2.3vw, 26px);
  line-height: 1.32;
  letter-spacing: .01em;
}

.prose h2 span {
  background: linear-gradient(92deg, #fff, #ffb6cd 56%, var(--pink));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.prose h3 {
  margin: 26px 0 10px;
  font-size: 18px;
  line-height: 1.4;
  color: #ffdae5;
}

.prose p { margin: 0 0 14px; color: #f4dfe5; }
.prose p:last-child { margin-bottom: 0; }

.prose ul,
.prose ol { margin: 0 0 16px; padding-left: 22px; }
.prose li { margin: 0 0 8px; }
.prose li::marker { color: var(--pink); }

.prose a {
  color: #ff92c1;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.prose a:hover { color: #fff; }

.prose strong { color: #fff; }

.prose blockquote {
  margin: 0 0 16px;
  padding: 12px 18px;
  border-left: 2px solid var(--pink);
  border-radius: 0 14px 14px 0;
  background: rgba(255, 20, 147, .08);
  color: #f5dde4;
}

.prose code {
  padding: 1px 6px;
  border-radius: 6px;
  background: rgba(255, 255, 255, .1);
  font-size: .95em;
}

.prose img {
  height: auto;
  border-radius: 12px;
  display: block;
  margin: 4px 0 16px;
}

.rail-side {
  position: sticky;
  top: 108px;
  padding: 22px 20px 18px;
  border-radius: var(--r);
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, .045);
  -webkit-backdrop-filter: blur(13px);
  backdrop-filter: blur(13px);
}

.side-h {
  margin: 0 0 14px;
  font-size: 16px;
  font-weight: 500;
  letter-spacing: .18em;
  color: #ffc2d7;
}

.side-h span { display: inline-block; }

.side-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.side-list a {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 40px;
  padding: 6px 8px;
  border-radius: 10px;
  color: var(--dim);
  font-size: 16px;
  line-height: 1.35;
  text-decoration: none;
}

.side-list a:hover,
.side-list a:focus-visible { color: #fff; background: var(--glass); }

.side-list .num {
  flex: 0 0 auto;
  font-size: 13px;
  color: var(--pink);
  opacity: .85;
  letter-spacing: .06em;
}

/* ---------- 页脚 ---------- */
footer {
  padding: 56px 48px 34px 288px;
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(24, 12, 12, .35), rgba(18, 9, 9, .92));
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

.foot-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 36px;
  max-width: 1120px;
  margin: 0 auto;
}

.foot-col { min-width: 0; }

address {
  font-style: normal;
  font-size: 16px;
  line-height: 1.8;
  color: var(--dim);
}

address strong {
  display: block;
  font-size: 17px;
  font-weight: 500;
  color: #fff;
  margin-bottom: 6px;
}

.ad-line { display: block; font-size: 14px; color: #c9a9b3; }
.ad-host { color: #ff9ac5; word-break: break-all; }

.foot-form h3,
.foot-nav h3 {
  margin: 0 0 14px;
  font-size: 15px;
  font-weight: 500;
  letter-spacing: .2em;
  color: #ffc2d7;
}

.sub-form { display: flex; flex-direction: column; gap: 10px; }

.sub-form input {
  width: 100%;
  min-height: 44px;
  padding: 10px 14px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: rgba(0, 0, 0, .32);
  color: var(--fg);
  font: inherit;
  font-size: 16px;
}

.sub-form input::placeholder { color: #b79aa4; }

.sub-form input:focus-visible {
  outline: 2px solid var(--pink);
  outline-offset: 1px;
}

.sub-form button {
  min-height: 44px;
  padding: 10px 20px;
  border: 1px solid rgba(255, 255, 255, .18);
  border-radius: 12px;
  background: linear-gradient(110deg, var(--red), var(--pink));
  color: #fff;
  font: inherit;
  font-size: 16px;
  cursor: pointer;
  transition: filter .25s, transform .2s;
}

.sub-form button:hover { filter: brightness(1.12); transform: translateY(-1px); }

.foot-nav dl { margin: 0; }

.foot-nav dt,
.foot-nav dd { margin: 0; }

.foot-nav a {
  display: flex;
  align-items: center;
  min-height: 40px;
  padding: 4px 0;
  color: var(--dim);
  font-size: 16px;
  text-decoration: none;
  border-bottom: 1px dashed rgba(255, 20, 147, .16);
}

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

.foot-nav a:hover,
.foot-nav a:focus-visible { color: #ff9ac5; }

.foot-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  max-width: 1120px;
  margin: 40px auto 0;
  padding-top: 22px;
  border-top: 1px solid rgba(255, 255, 255, .08);
}

.foot-links {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 4px;
  margin: 0;
  padding: 0;
}

.foot-links a {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 6px 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  color: var(--dim);
  font-size: 15px;
  text-decoration: none;
}

.foot-links a:hover,
.foot-links a:focus-visible { color: #fff; background: var(--glass); }

.to-top {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 6px 16px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, .18);
  color: #fff;
  font-size: 15px;
  text-decoration: none;
  background: rgba(255, 255, 255, .06);
}

.to-top:hover { background: rgba(255, 20, 147, .22); }

.copy {
  max-width: 1120px;
  margin: 20px auto 0;
  font-size: 13px;
  color: #b1949e;
  letter-spacing: .05em;
}

/* ---------- 中屏 ---------- */
@media (max-width: 1120px) {
  .shell { padding: 52px 32px 60px 28px; gap: 26px; grid-template-columns: minmax(0, 1fr) 236px; }
  footer { padding: 48px 32px 30px 268px; }
  .hero-cap { padding-right: 34px; }
}

/* ---------- 竖排导轨转顶栏 ---------- */
@media (max-width: 900px) {
  .rail {
    top: 0;
    right: 0;
    bottom: auto;
    width: auto;
    height: auto;
    flex-direction: row;
    align-items: center;
    gap: 10px;
    padding: 8px 12px;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .brand { width: 44px; height: 44px; flex: 0 0 44px; }

  .rail-nav { flex: 1 1 auto; min-width: 0; overflow-x: auto; scrollbar-width: none; }
  .rail-nav::-webkit-scrollbar { display: none; }
  .rail-nav ul { flex-direction: row; gap: 6px; }
  .rail-nav a { white-space: nowrap; padding: 10px 12px; }
  .rail-nav a:hover .ico { transform: none; }

  main { padding-left: 0; padding-top: 61px; }

  .hero-fig { min-height: calc(100svh - 61px); }

  .hero-cap { padding: 0 20px 9vh 20px; max-width: 100%; }
  .hero-desc { font-size: 16px; }

  .shell {
    grid-template-columns: minmax(0, 1fr);
    padding: 40px 18px 52px;
    gap: 22px;
  }

  .rail-side { position: static; order: 2; }
  .prose > div { scroll-margin-top: 84px; padding: 22px 18px; }

  footer { padding: 40px 18px 28px; }
  .foot-grid { grid-template-columns: minmax(0, 1fr); gap: 28px; }
  .foot-nav a { min-height: 44px; }
  .foot-bar { margin-top: 30px; }
}

/* ---------- 小屏 ---------- */
@media (max-width: 560px) {
  .hero-cap h1 { font-size: clamp(27px, 8.4vw, 38px); }
  .hero-desc { font-size: 15px; }
  .prose h2 { font-size: 20px; }
  .side-list { gap: 0; }
  .foot-links a { font-size: 15px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  body::before { animation: none; }
  .hero-fig,
  .prose > div { animation: none; }
  .hero-img { transform: none !important; }
  .sub-form button:hover { transform: none; }
}

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