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

:root{
  --pink:#ff0080;
  --magenta:#ff00ff;
  --ink:#26171f;
  --bg:#0d0610;
  --text:#f8eff5;
  --muted:#c8afbd;
  --soft:#e9dbe4;
  --line:rgba(255,0,128,.24);
  --card:rgba(38,23,31,.66);
  --rail:236px;
  --r:28px;
}

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

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

body{
  margin:0;
  background:transparent;
  color:var(--text);
  font-family:'Inter','PingFang SC','Hiragino Sans GB','Microsoft YaHei',system-ui,-apple-system,sans-serif;
  font-size:1.0625rem;
  line-height:1.75;
  letter-spacing:.01em;
  overflow-x:hidden;
}

body::before{
  content:'';
  position:fixed;
  inset:-22% -12%;
  z-index:-2;
  pointer-events:none;
  background:
    radial-gradient(38% 42% at 16% 20%, rgba(255,0,128,.62), transparent 70%),
    radial-gradient(34% 38% at 80% 12%, rgba(255,0,255,.48), transparent 72%),
    radial-gradient(48% 52% at 62% 82%, rgba(112,26,255,.45), transparent 74%),
    conic-gradient(from 210deg at 50% 50%, rgba(255,0,128,.4), rgba(255,0,255,.28), rgba(38,23,31,.95), rgba(255,0,128,.4));
  filter:blur(58px) saturate(140%);
  opacity:.55;
  mix-blend-mode:screen;
  animation:drift 26s ease-in-out infinite alternate;
}

body::after{
  content:'';
  position:fixed;
  inset:0;
  z-index:-1;
  pointer-events:none;
  background-image:
    repeating-linear-gradient(90deg, rgba(255,255,255,.06) 0 1px, transparent 1px 84px),
    repeating-linear-gradient(0deg, rgba(255,255,255,.05) 0 1px, transparent 1px 84px);
  -webkit-mask-image:radial-gradient(125% 95% at 50% 0%, #000 18%, transparent 86%);
  mask-image:radial-gradient(125% 95% at 50% 0%, #000 18%, transparent 86%);
  opacity:.75;
}

@keyframes drift{
  0%{transform:translate3d(-2%,-1%,0) scale(1.05);filter:blur(58px) hue-rotate(0deg) saturate(140%)}
  50%{transform:translate3d(2%,2%,0) scale(1.12);filter:blur(62px) hue-rotate(18deg) saturate(155%)}
  100%{transform:translate3d(-1%,3%,0) scale(1.07);filter:blur(56px) hue-rotate(-14deg) saturate(140%)}
}

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

img{max-width:100%;height:auto}
a{color:#ff9ad0}
.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;
}

/* 左侧竖排导航 */
.rail{
  position:fixed;
  top:0;left:0;bottom:0;
  width:var(--rail);
  z-index:40;
  display:flex;
  flex-direction:column;
  gap:18px;
  padding:22px 14px 22px;
  overflow-y:auto;
  background:linear-gradient(180deg, rgba(24,11,22,.93), rgba(13,6,16,.88));
  border-right:1px solid var(--line);
  backdrop-filter:blur(16px);
}

.mark{
  display:grid;
  place-items:center;
  width:44px;height:44px;
  border-radius:14px;
  text-decoration:none;
  background:linear-gradient(135deg, rgba(255,0,128,.9), rgba(255,0,255,.75));
  box-shadow:0 10px 26px rgba(255,0,128,.4);
  overflow:hidden;
  flex:0 0 auto;
}
.mark img{width:100%;height:100%;object-fit:cover;display:block}
.mark-dot{
  width:18px;height:18px;
  border-radius:6px;
  background:#fff;
  transform:rotate(45deg);
  box-shadow:0 0 14px #fff;
}

.rail-nav ul{
  list-style:none;
  margin:0;padding:0;
  display:flex;
  flex-direction:column;
  gap:6px;
}
.rail-nav a{
  display:flex;
  align-items:center;
  gap:10px;
  min-height:46px;
  padding:10px 12px;
  border-radius:14px;
  border:1px solid transparent;
  color:var(--muted);
  font-size:1rem;
  text-decoration:none;
  transition:transform .18s ease, background .18s ease, color .18s ease, border-color .18s ease;
}
.rail-nav a:hover,
.rail-nav a:focus-visible,
.rail-nav a.is-on{
  color:#fff;
  transform:translateX(4px);
  border-color:var(--line);
  background:linear-gradient(90deg, rgba(255,0,128,.26), rgba(255,0,255,.08));
}
.ico{display:grid;place-items:center;color:var(--pink);flex:0 0 auto;transition:color .18s ease}
.rail-nav a:hover .ico,
.rail-nav a.is-on .ico{color:var(--magenta)}

.stage{
  margin-left:var(--rail);
  padding:0 clamp(16px,5vw,68px);
}

main{display:block}
article{max-width:940px;margin:0 auto}

/* 首屏 */
.hero{
  position:relative;
  display:grid;
  place-items:center;
  min-height:100vh;
  min-height:100svh;
  padding:76px 0 92px;
  text-align:center;
  overflow:hidden;
  isolation:isolate;
  animation:rise .8s cubic-bezier(.2,.7,.2,1) both;
}

.collage{position:absolute;inset:0;z-index:1;pointer-events:none}
.frame{
  position:absolute;
  margin:0;
  border-radius:22px;
  overflow:hidden;
  border:1px solid rgba(255,0,255,.32);
  background:linear-gradient(140deg, rgba(255,0,128,.42), rgba(255,0,255,.2));
  box-shadow:0 26px 62px rgba(255,0,128,.24);
}
.frame img{display:block;width:100%;height:100%;object-fit:cover;opacity:.86}
.f1{width:clamp(150px,25vw,290px);height:clamp(190px,32vw,370px);top:7%;left:0;transform:rotate(-6deg)}
.f2{width:clamp(130px,21vw,250px);height:clamp(170px,27vw,320px);bottom:9%;right:0;transform:rotate(5deg)}

.hero::before{
  content:'';
  position:absolute;
  inset:0;
  z-index:2;
  background:radial-gradient(58% 54% at 50% 50%, rgba(13,6,16,.88), rgba(13,6,16,.42) 68%, rgba(13,6,16,.05));
}

.hero-copy{position:relative;z-index:3;max-width:660px;margin:0 auto}
.kicker{
  margin:0 0 16px;
  color:#ffb4dc;
  font-size:.95rem;
  font-weight:500;
  letter-spacing:.26em;
  text-transform:none;
}
.hero h1{
  margin:0 0 18px;
  font-size:clamp(2.1rem,6.2vw,4rem);
  line-height:1.12;
  font-weight:700;
  letter-spacing:-.02em;
  background:linear-gradient(118deg,#ffffff 12%,#ffc2e4 52%,#ff00ff 96%);
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
}
.hero-sub{
  margin:0 auto 28px;
  max-width:38ch;
  color:var(--muted);
  font-size:1.05rem;
}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;justify-content:center}
.btn{
  display:inline-flex;
  align-items:center;
  min-height:48px;
  padding:12px 24px;
  border-radius:999px;
  border:1px solid var(--line);
  color:#fff;
  font-size:1rem;
  text-decoration:none;
  background:rgba(255,255,255,.05);
  transition:transform .18s ease, box-shadow .18s ease, background .18s ease;
}
.btn:hover,.btn:focus-visible{transform:translateY(-3px);box-shadow:0 14px 30px rgba(255,0,255,.28)}
.btn-main{
  border-color:transparent;
  background:linear-gradient(120deg,var(--pink),var(--magenta));
  font-weight:600;
}
.hero-slash{
  position:absolute;
  left:-10%;
  bottom:14px;
  width:120%;
  height:6px;
  z-index:4;
  background:linear-gradient(90deg, transparent, var(--pink), var(--magenta), transparent);
  box-shadow:0 0 26px var(--pink);
  transform:rotate(-1.2deg);
}

/* 过渡小节 */
.lede,.outro{position:relative;padding:34px 0 8px;margin-top:8px}
.lede::before,.outro::before{
  content:'';
  position:absolute;
  top:6px;left:0;
  width:64px;height:2px;
  background:linear-gradient(90deg,var(--pink),var(--magenta));
  box-shadow:0 0 14px var(--pink);
}
.outro{padding-bottom:28px}
.outro h2{margin-bottom:10px}

h2{
  margin:0 0 10px;
  font-size:clamp(1.45rem,3.5vw,2rem);
  line-height:1.28;
  font-weight:700;
  letter-spacing:-.01em;
  color:#fff;
}
p.subtitle{
  margin:0 0 18px;
  max-width:54ch;
  color:var(--muted);
  font-size:1.02rem;
}

/* 正文卡片 */
article > div[id]{
  position:relative;
  margin:22px 0;
  padding:26px clamp(18px,3vw,36px);
  border-radius:var(--r);
  border:1px solid var(--line);
  background:linear-gradient(180deg, var(--card), rgba(19,9,17,.66));
  box-shadow:0 24px 54px rgba(0,0,0,.38);
  overflow:hidden;
  scroll-margin-top:98px;
  animation:rise .72s cubic-bezier(.2,.7,.2,1) both;
}
article > div[id]::after{
  content:'';
  position:absolute;
  left:0;right:0;bottom:0;
  height:3px;
  background:linear-gradient(90deg, transparent, var(--pink), var(--magenta), transparent);
  box-shadow:0 0 18px var(--pink);
}
article > div[id] h2{margin-top:0}
article > div[id] h3{
  margin:24px 0 8px;
  font-size:1.16rem;
  color:#fff;
}
article > div[id] p{margin:0 0 14px;color:var(--soft)}
article > div[id] ul,
article > div[id] ol{padding-left:1.25em;margin:0 0 14px;color:var(--soft)}
article > div[id] li{margin:.4em 0}
article > div[id] blockquote{
  margin:18px 0;
  padding:14px 18px;
  border-left:3px solid var(--pink);
  border-radius:0 18px 18px 0;
  background:rgba(255,0,128,.09);
  color:var(--soft);
}
article > div[id] table{width:100%;border-collapse:collapse;margin:16px 0;font-size:1rem}
article > div[id] th,
article > div[id] td{
  padding:10px 12px;
  text-align:left;
  border-bottom:1px solid rgba(255,255,255,.14);
}
article > div[id] img{border-radius:18px;margin:8px 0}

article > :nth-child(1){--d:0s}
article > :nth-child(2){--d:.06s}
article > :nth-child(3){--d:.12s}
article > :nth-child(4){--d:.18s}
article > :nth-child(5){--d:.24s}
article > :nth-child(6){--d:.3s}
article > :nth-child(7){--d:.36s}
article > :nth-child(8){--d:.42s}
article > :nth-child(9){--d:.48s}
article > :nth-child(10){--d:.54s}
article > :nth-child(11){--d:.6s}
article > div[id]{animation-delay:var(--d,0s)}

/* 页脚 */
.foot{
  position:relative;
  max-width:940px;
  margin:52px auto 0;
  padding:32px 0 44px;
  border-top:1px solid var(--line);
  display:flex;
  flex-direction:column;
  gap:14px;
}
.foot::before{
  content:'';
  position:absolute;
  top:-1px;left:0;
  width:180px;height:2px;
  background:linear-gradient(90deg,var(--pink),var(--magenta));
  box-shadow:0 0 16px var(--pink);
}
.foot-lead{margin:0;color:var(--muted);font-size:1rem}
.foot-sub{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin:0}
#mail{
  flex:1 1 220px;
  min-height:48px;
  padding:0 16px;
  border-radius:14px;
  border:1px solid var(--line);
  background:rgba(255,255,255,.06);
  color:#fff;
  font:inherit;
  font-size:1rem;
}
#mail:focus-visible{outline:2px solid var(--magenta);outline-offset:2px}
#subBtn{
  min-height:48px;
  padding:0 24px;
  border:0;
  border-radius:14px;
  background:linear-gradient(120deg,var(--pink),var(--magenta));
  color:#fff;
  font:inherit;
  font-weight:600;
  cursor:pointer;
  transition:transform .18s ease, box-shadow .18s ease;
}
#subBtn:hover{transform:translateY(-2px);box-shadow:0 12px 26px rgba(255,0,255,.3)}
.sub-note{font-size:.95rem;color:var(--muted)}
.sub-note.bad{color:#ff9ad0}
.sub-note.good{color:#8affd0}

.foot-base{
  display:flex;
  flex-wrap:wrap;
  gap:10px 18px;
  justify-content:space-between;
  align-items:center;
  margin:0;
  padding-top:12px;
  border-top:1px solid rgba(255,255,255,.08);
  color:var(--muted);
  font-size:.98rem;
}
.foot-base small{font-size:inherit}
.foot-base a{
  display:inline-block;
  padding:10px 6px;
  color:var(--muted);
  text-decoration:none;
  border-bottom:1px solid transparent;
}
.foot-base a:hover,.foot-base a:focus-visible{color:#fff;border-bottom-color:var(--pink)}

/* 窄屏：导航转为顶部横条 */
@media (max-width:880px){
  .rail{
    left:0;right:0;bottom:auto;
    width:auto;
    flex-direction:row;
    align-items:center;
    gap:10px;
    padding:8px 12px;
    border-right:0;
    border-bottom:1px solid var(--line);
    overflow:visible;
  }
  .mark{width:38px;height:38px;border-radius:12px}
  .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;
    min-height:44px;
    padding:8px 12px;
    gap:7px;
    font-size:1rem;
  }
  .rail-nav a:hover,.rail-nav a.is-on{transform:none}
  .stage{margin-left:0;padding-top:64px}
  article > div[id]{scroll-margin-top:84px;border-radius:24px}
  .hero{min-height:86svh;padding:56px 0 78px}
  .frame{opacity:.62}
  .f1{top:5%;left:-5%}
  .f2{bottom:7%;right:-5%}
  .foot{margin-top:40px}
}

@media (max-width:420px){
  .kicker{letter-spacing:.16em;font-size:.9rem}
  .hero-sub{font-size:1rem}
  .rail-nav a .txt{font-size:.98rem}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
}

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