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

:root{
  --lime:#87ff71;
  --cyan:#01cdfe;
  --ink:#192617;
  --pink:#ff71ce;
  --violet:#b967ff;
  --deep:#0a120b;
  --deep-2:#101b11;
  --text:#e5ffe0;
  --text-2:#cfeece;
  --line:rgba(135,255,113,.22);
  --rail:242px;
  --disp:"Fredoka","Nunito",system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;
  --body:"Nunito",system-ui,-apple-system,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
}

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

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

body{
  margin:0;
  min-height:100vh;
  font-family:var(--body);
  font-size:16.5px;
  line-height:1.7;
  color:var(--text);
  background:
    radial-gradient(1150px 620px at 88% -12%, rgba(255,113,206,.24), transparent 62%),
    radial-gradient(900px 520px at 4% 108%, rgba(1,205,254,.20), transparent 62%),
    linear-gradient(180deg, var(--deep-2), var(--deep) 68%);
  background-attachment:fixed;
  overflow-x:hidden;
}

body::before,
body::after{
  content:"";
  position:fixed;
  inset:0;
  pointer-events:none;
  z-index:0;
}

body::before{
  background-image:
    linear-gradient(rgba(1,205,254,.10) 1px, transparent 1px),
    linear-gradient(90deg, rgba(1,205,254,.10) 1px, transparent 1px);
  background-size:66px 66px;
  opacity:.55;
}

body::after{
  background-image:repeating-linear-gradient(180deg, rgba(0,0,0,.30) 0, rgba(0,0,0,.30) 1px, transparent 1px, transparent 3px);
  opacity:.30;
}

a{color:var(--cyan)}

:focus-visible{
  outline:2px solid var(--lime);
  outline-offset:3px;
  border-radius:6px;
}

.skip{
  position:absolute;
  left:-9999px;
  top:0;
  z-index:90;
}

.skip:focus{
  left:14px;
  top:14px;
  padding:10px 16px;
  min-height:44px;
  display:inline-flex;
  align-items:center;
  background:var(--lime);
  color:#0b140c;
  font-weight:700;
  border-radius:999px;
  text-decoration:none;
}

.strip{
  position:fixed;
  top:0;
  left:0;
  right:0;
  height:10px;
  z-index:80;
  background:linear-gradient(90deg, var(--lime), var(--cyan), var(--pink), var(--violet), var(--lime));
  background-size:300% 100%;
  animation:slide 9s linear infinite;
  box-shadow:0 0 22px rgba(1,205,254,.5);
}

@keyframes slide{
  from{background-position:0 0}
  to{background-position:300% 0}
}

/* ---------- 左侧固定导航 ---------- */

.rail{
  position:fixed;
  top:10px;
  left:0;
  bottom:0;
  width:var(--rail);
  z-index:60;
  padding:22px 16px 28px;
  overflow-y:auto;
  background:linear-gradient(180deg, rgba(25,38,23,.94), rgba(9,17,10,.97));
  border-right:1px solid var(--line);
  backdrop-filter:blur(6px);
}

.rail-brand{
  display:flex;
  align-items:center;
  gap:10px;
  margin:0 0 20px;
  font-family:var(--disp);
  font-weight:600;
  font-size:1.22rem;
  letter-spacing:.05em;
  line-height:1.25;
}

.rail-brand span{
  background:linear-gradient(92deg, var(--lime), var(--cyan) 78%);
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
  filter:drop-shadow(0 0 12px rgba(135,255,113,.4));
}

.mark{
  width:30px;
  height:30px;
  border-radius:10px;
  object-fit:cover;
  flex:0 0 auto;
}

.rail-nav{
  display:flex;
  flex-direction:column;
  gap:9px;
}

.pill{
  display:flex;
  align-items:center;
  gap:10px;
  min-height:44px;
  padding:10px 15px;
  border-radius:999px;
  border:1px solid rgba(135,255,113,.22);
  background:rgba(255,255,255,.035);
  color:#dcf7d6;
  text-decoration:none;
  font-size:1rem;
  font-weight:600;
  transition:background .25s ease, border-color .25s ease, color .25s ease, transform .25s ease, box-shadow .25s ease;
}

.pill-num{
  font-family:var(--disp);
  font-size:.74rem;
  font-weight:500;
  letter-spacing:.1em;
  color:var(--cyan);
}

.pill:hover,
.pill:focus-visible{
  color:#fff;
  border-color:var(--lime);
  background:linear-gradient(90deg, rgba(135,255,113,.2), rgba(1,205,254,.18));
  box-shadow:0 0 24px rgba(1,205,254,.3);
  transform:translateX(3px);
}

/* ---------- 主体 ---------- */

main{
  position:relative;
  z-index:2;
  margin-left:var(--rail);
}

.hero{
  position:relative;
  overflow:hidden;
  display:flex;
  align-items:center;
  justify-content:flex-end;
  min-height:70vh;
  padding:clamp(30px,6vw,76px) clamp(20px,5vw,66px) clamp(84px,11vw,150px);
  clip-path:polygon(0 0, 100% 0, 100% 84%, 0 100%);
  background:linear-gradient(200deg, rgba(185,103,255,.20), rgba(255,113,206,.16) 42%, rgba(25,38,23,0) 76%);
}

.hero::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  height:7px;
  background:linear-gradient(90deg, var(--pink), var(--violet), var(--cyan), var(--lime));
  transform:skewY(-1.6deg);
  z-index:3;
}

.hero-art{
  position:absolute;
  inset:0;
  margin:0;
  z-index:0;
}

.hero-img{
  position:absolute;
  inset:0;
  width:100%;
  height:100%;
  object-fit:cover;
  opacity:.34;
  filter:hue-rotate(-8deg) saturate(1.15);
}

.sun{
  position:absolute;
  right:7%;
  top:11%;
  width:min(46vw,460px);
  aspect-ratio:1 / 1;
  border-radius:50%;
  background:radial-gradient(circle at 50% 38%, #fff0a8, var(--pink) 44%, var(--violet) 76%, transparent 79%);
  opacity:.55;
  box-shadow:0 0 130px rgba(255,113,206,.42);
}

.grid-floor{
  position:absolute;
  left:-10%;
  right:-10%;
  bottom:0;
  height:56%;
  background-image:
    linear-gradient(rgba(135,255,113,.55) 1px, transparent 1px),
    linear-gradient(90deg, rgba(135,255,113,.45) 1px, transparent 1px);
  background-size:100% 46px, 74px 100%;
  transform:perspective(430px) rotateX(64deg);
  transform-origin:bottom center;
  opacity:.48;
}

.hero-copy{
  position:relative;
  z-index:2;
  max-width:36rem;
  text-align:right;
}

.hero h1{
  margin:0 0 16px;
  font-family:var(--disp);
  font-weight:700;
  font-size:clamp(2.05rem, 5.2vw, 4.1rem);
  line-height:1.06;
  letter-spacing:.01em;
  background:linear-gradient(118deg, #ffffff, var(--lime) 46%, var(--cyan));
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
  filter:drop-shadow(0 0 24px rgba(135,255,113,.35));
}

.hero-desc{
  margin:0 0 0 auto;
  max-width:30rem;
  font-size:1.02rem;
  color:#d5f3d1;
  text-shadow:0 0 16px rgba(10,18,11,.7);
}

.shell{
  padding:0 clamp(18px,5vw,66px) 70px;
}

.doc{
  max-width:820px;
  margin:0 auto;
  counter-reset:none;
}

.doc > section{
  position:relative;
  padding:clamp(24px,4vw,44px) 0 10px;
  border-top:1px solid transparent;
  border-image:linear-gradient(90deg, rgba(135,255,113,.55), rgba(1,205,254,.28), transparent) 1;
  scroll-margin-top:26px;
}

.doc > section:first-child{
  border-top:0;
  padding-top:clamp(26px,4vw,44px);
}

.doc h2{
  margin:0 0 .7em;
  font-family:var(--disp);
  font-weight:600;
  font-size:clamp(1.45rem, 3vw, 2.05rem);
  line-height:1.22;
  color:#f1ffea;
}

.doc h2 > span{
  display:inline-block;
  padding-bottom:3px;
  border-bottom:3px solid rgba(1,205,254,.55);
  text-shadow:0 0 20px rgba(1,205,254,.38);
}

.doc h3{
  margin:1.35em 0 .55em;
  font-family:var(--disp);
  font-weight:500;
  font-size:clamp(1.12rem, 2.1vw, 1.35rem);
  line-height:1.35;
  color:#eaffdf;
}

.doc h3 > span{
  display:inline-block;
  padding-left:12px;
  border-left:4px solid var(--lime);
}

.doc p{
  margin:0 0 1.05em;
  color:var(--text-2);
}

.doc ul,
.doc ol{
  margin:0 0 1.1em;
  padding-left:1.35em;
  color:var(--text-2);
}

.doc li{margin:0 0 .5em}

.doc li::marker{color:var(--lime)}

.doc a{
  color:var(--cyan);
  text-decoration-color:rgba(1,205,254,.45);
  text-underline-offset:3px;
}

.doc a:hover{color:var(--lime)}

.doc figure,
.doc aside{
  margin:1.3em 0;
  padding:14px 16px;
  border:1px solid var(--line);
  border-radius:18px;
  background:rgba(255,255,255,.035);
  box-shadow:0 18px 36px -22px rgba(0,0,0,.85);
}

.doc figure img,
.doc img{
  max-width:100%;
  height:auto;
  border-radius:14px;
  display:block;
}

.doc blockquote{
  margin:1.3em 0;
  padding:14px 18px;
  border-left:4px solid var(--violet);
  border-radius:0 18px 18px 0;
  background:rgba(185,103,255,.12);
  color:#eaffdf;
}

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

.doc code{
  font-size:.94em;
  padding:2px 6px;
  border-radius:8px;
  background:rgba(1,205,254,.14);
  color:#d8fbff;
}

.doc table{
  width:100%;
  border-collapse:collapse;
  margin:1.2em 0;
  font-size:.98rem;
}

.doc th,
.doc td{
  padding:9px 12px;
  border-bottom:1px solid var(--line);
  text-align:left;
}

.doc th{color:var(--lime);font-weight:600}

/* ---------- 页脚 ---------- */

.foot{
  position:relative;
  z-index:2;
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:16px 30px;
  padding:36px clamp(18px,5vw,66px) 42px;
  border-top:1px solid var(--line);
  background:
    linear-gradient(180deg, rgba(1,205,254,.09), rgba(255,113,206,.10)),
    rgba(9,17,10,.7);
}

.foot-brand h2{
  margin:0;
  font-family:var(--disp);
  font-weight:700;
  font-size:clamp(1.8rem, 5vw, 2.9rem);
  line-height:1;
  letter-spacing:.02em;
}

.foot-brand h2 span{
  background:linear-gradient(92deg, var(--lime), var(--cyan) 52%, var(--pink));
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
  filter:drop-shadow(0 0 20px rgba(1,205,254,.4));
}

.foot-nav{flex:1 1 320px}

.foot-nav dl{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:4px 6px;
  margin:0;
}

.foot-nav dt{
  margin:0 6px 0 0;
  font-size:.95rem;
  letter-spacing:.14em;
  color:#9fd39a;
}

.foot-nav dd{margin:0}

.foot-nav a{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:0 13px;
  border:1px solid transparent;
  border-radius:999px;
  color:#dcf7d6;
  font-size:1rem;
  text-decoration:none;
  transition:background .22s ease, border-color .22s ease, color .22s ease;
}

.foot-nav a:hover,
.foot-nav a:focus-visible{
  color:#fff;
  border-color:rgba(1,205,254,.5);
  background:rgba(1,205,254,.12);
}

.foot-copy{
  flex:0 0 auto;
  font-size:.95rem;
  letter-spacing:.08em;
  color:#9fd39a;
  padding:6px 14px;
  border:1px dashed rgba(135,255,113,.3);
  border-radius:999px;
}

/* ---------- 滚动显现 ---------- */

.rv{
  opacity:0;
  transform:translateY(18px);
  transition:opacity .6s ease, transform .6s cubic-bezier(.2,.7,.2,1);
}

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

/* ---------- 断点 ---------- */

@media (max-width:900px){
  .strip{height:8px}

  .rail{
    position:relative;
    top:auto;
    bottom:auto;
    width:auto;
    overflow:visible;
    padding:16px 14px 12px;
    border-right:0;
    border-bottom:1px solid var(--line);
    backdrop-filter:none;
  }

  .rail-brand{
    margin:0 0 12px;
    font-size:1.1rem;
  }

  .rail-nav{
    flex-direction:row;
    gap:8px;
    overflow-x:auto;
    padding-bottom:6px;
    scrollbar-width:none;
  }

  .rail-nav::-webkit-scrollbar{display:none}

  .pill{
    flex:0 0 auto;
    white-space:nowrap;
    transform:none;
  }

  .pill:hover{transform:none}

  main{margin-left:0}

  .hero{
    min-height:0;
    padding:30px 18px 66px;
    justify-content:flex-start;
    clip-path:polygon(0 0, 100% 0, 100% 92%, 0 100%);
  }

  .hero-copy{text-align:left;max-width:100%}

  .hero h1{font-size:clamp(1.85rem, 8vw, 2.6rem)}

  .hero-desc{margin-left:0;font-size:1rem}

  .sun{
    width:200px;
    right:-30px;
    top:6%;
    opacity:.45;
  }

  .shell{padding:0 18px 56px}

  .foot{
    flex-direction:column;
    align-items:flex-start;
    gap:10px;
    padding:30px 18px 38px;
  }

  .foot-nav{flex:1 1 auto;width:100%}

  .foot-copy{width:100%;text-align:center;padding:8px}
}

@media (max-width:420px){
  .pill{padding:10px 12px;font-size:.96rem}
  .pill-num{display:none}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .strip{animation:none}
  .rv{opacity:1;transform:none;transition:none}
  .pill{transition:none}
}

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