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

:root{
  --mint:#b4fde1;
  --sky:#add8e6;
  --ink:#172620;
  --ink-2:#0b1512;
  --paper:#e8fff5;
  --ff-d:'Russo One','Chakra Petch','PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;
  --ff-b:'Chakra Petch','PingFang SC','Hiragino Sans GB','Microsoft YaHei',system-ui,sans-serif;
}

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

html{
  scroll-behavior:smooth;
  overflow-x:hidden;
  background:var(--ink-2);
}

body{
  margin:0;
  padding:0 0 186px;
  font-family:var(--ff-b);
  font-size:17px;
  line-height:1.72;
  color:#dcf6ec;
  background:
    radial-gradient(120% 55% at 10% -8%,rgba(180,253,225,.22),transparent 58%),
    radial-gradient(90% 48% at 92% 6%,rgba(173,216,230,.20),transparent 60%),
    linear-gradient(180deg,#1c3128,#0f1d17 58%,#0a1310);
  background-attachment:fixed;
  -webkit-text-size-adjust:100%;
  overflow-x:hidden;
}

body.is-locked{overflow:hidden}

h1,h2,h3{font-family:var(--ff-d);font-weight:400;line-height:1.18;color:var(--mint);margin:0 0 .5em}

p{margin:0 0 1em}

a{color:var(--mint);text-decoration:none}

a:focus-visible,button:focus-visible{outline:3px solid var(--sky);outline-offset:3px}

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

[id]{scroll-margin-top:22px}

/* ---------- 底栏 ---------- */
.dock{
  position:fixed;
  left:0;right:0;bottom:0;
  z-index:60;
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  padding:8px 10px calc(8px + env(safe-area-inset-bottom));
  background:linear-gradient(180deg,rgba(24,40,33,.94),rgba(9,18,14,.98));
  border-top:4px solid rgba(180,253,225,.5);
  border-radius:22px 22px 0 0;
  box-shadow:0 -8px 26px rgba(0,0,0,.5),inset 0 3px 0 rgba(255,255,255,.08);
  backdrop-filter:blur(9px);
}

.burger{
  order:1;
  display:inline-flex;
  align-items:center;
  gap:7px;
  min-height:40px;
  padding:8px 12px;
  font-family:inherit;
  font-size:16px;
  color:#ddf4ff;
  border:3px solid rgba(173,216,230,.5);
  border-radius:16px;
  background:rgba(173,216,230,.12);
  box-shadow:inset -2px -2px 6px rgba(0,0,0,.35),2px 2px 7px rgba(0,0,0,.35);
  cursor:pointer;
  transition:transform .2s cubic-bezier(.34,1.56,.64,1);
}

.burger:active{transform:translateY(2px) scale(.97)}

.bars{position:relative;width:16px;height:2px;border-radius:2px;background:currentColor;box-shadow:0 5px 0 currentColor,0 -5px 0 currentColor}

.mark{
  order:2;
  flex:1;
  text-align:center;
  font-family:var(--ff-d);
  font-size:20px;
  color:var(--mint);
  text-shadow:0 2px 0 rgba(0,0,0,.55);
}

.cta{
  order:3;
  display:inline-flex;
  align-items:center;
  min-height:40px;
  padding:8px 15px;
  font-family:var(--ff-d);
  font-size:16px;
  color:#0e2018;
  border:3px solid #0a1712;
  border-radius:999px;
  background:linear-gradient(160deg,#dcfff1,#8befcb);
  box-shadow:0 5px 0 #0a1712,inset -2px -2px 8px rgba(0,0,0,.16);
  transition:transform .2s cubic-bezier(.34,1.56,.64,1);
}

.cta:active{transform:translateY(3px)}

.dock-list{
  flex:1 1 100%;
  display:flex;
  flex-wrap:wrap;
  justify-content:center;
  gap:6px;
  margin:0;padding:0;
  list-style:none;
}

.is-left{order:4}
.is-right{order:5}

.dock-list a{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  padding:5px 11px;
  font-size:16px;
  border:3px solid rgba(180,253,225,.28);
  border-radius:16px;
  background:rgba(180,253,225,.07);
  box-shadow:inset -2px -2px 6px rgba(0,0,0,.32),2px 2px 7px rgba(0,0,0,.32);
  transition:transform .22s cubic-bezier(.34,1.56,.64,1),background .22s ease-out;
}

.dock-list a:hover{background:rgba(180,253,225,.18);transform:translateY(-2px)}
.dock-list a:active{transform:translateY(1px) scale(.97)}

/* ---------- 遮罩菜单 ---------- */
.sheet{
  position:fixed;
  inset:0;
  z-index:80;
  display:flex;
  flex-direction:column;
  gap:18px;
  padding:22px 18px 130px;
  overflow:auto;
  background:
    radial-gradient(80% 55% at 20% 0%,rgba(180,253,225,.22),transparent 62%),
    linear-gradient(180deg,#15261f,#0a1310);
  opacity:0;
  visibility:hidden;
  transform:translateY(14px) scale(.98);
  transition:opacity .26s ease-out,transform .3s cubic-bezier(.34,1.56,.64,1),visibility .3s;
}

.sheet.is-open{opacity:1;visibility:visible;transform:none}

.sheet-head{display:flex;align-items:center;justify-content:space-between;gap:12px}
.sheet-head .mark{flex:0 1 auto;text-align:left;font-size:24px}

.sheet-x{
  min-height:44px;
  padding:8px 16px;
  font-family:inherit;
  font-size:16px;
  color:var(--mint);
  border:3px solid var(--mint);
  border-radius:999px;
  background:transparent;
  cursor:pointer;
}

.sheet-list{list-style:none;margin:0;padding:0;display:grid;gap:10px}

.sheet-list a{
  display:flex;
  align-items:center;
  min-height:56px;
  padding:10px 18px;
  font-family:var(--ff-d);
  font-size:20px;
  border:3px solid rgba(180,253,225,.3);
  border-radius:18px;
  background:rgba(180,253,225,.07);
  box-shadow:inset -2px -2px 8px rgba(0,0,0,.3),3px 3px 10px rgba(0,0,0,.35);
}

/* ---------- 首屏 ---------- */
.hero{
  position:relative;
  display:grid;
  place-items:center;
  min-height:70vh;
  padding:54px 16px 62px;
  overflow:hidden;
  border-bottom:4px solid rgba(180,253,225,.4);
  border-radius:0 0 56px 56px;
  box-shadow:0 14px 34px rgba(0,0,0,.45),inset 0 -26px 70px rgba(8,17,13,.6);
}

.hero-bg{position:absolute;inset:0;margin:0}
.hero-bg img{width:100%;height:100%;object-fit:cover;opacity:.52}

.hero::after{
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(180deg,rgba(15,29,23,.5),rgba(10,19,16,.85));
}

.hero-in{position:relative;z-index:1;max-width:44rem;text-align:center}

.tagline{
  display:inline-block;
  margin:0 0 14px;
  padding:5px 16px;
  font-size:16px;
  letter-spacing:.06em;
  color:#e2f6ff;
  border:3px solid rgba(173,216,230,.55);
  border-radius:999px;
  background:rgba(173,216,230,.16);
  box-shadow:inset -2px -2px 8px rgba(0,0,0,.3),3px 3px 9px rgba(0,0,0,.32);
}

.hero h1{font-size:clamp(2rem,8.5vw,4rem);text-shadow:0 4px 0 rgba(6,16,12,.6)}

.lead{margin:0 auto 18px;max-width:32rem;color:#daf5ea}

.badges{display:flex;flex-wrap:wrap;justify-content:center;gap:10px;margin:0}

.badges a{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:8px 18px;
  font-size:16px;
  border:3px solid rgba(180,253,225,.45);
  border-radius:999px;
  background:rgba(180,253,225,.1);
  box-shadow:inset -2px -2px 8px rgba(0,0,0,.3),3px 3px 9px rgba(0,0,0,.32);
}

/* ---------- 正文区 ---------- */
.stage{
  display:grid;
  gap:18px;
  max-width:1180px;
  margin:26px auto 0;
  padding:0 14px 26px;
}

.prose{
  padding:18px;
  border:4px solid rgba(180,253,225,.26);
  border-radius:4px;
  background:rgba(180,253,225,.07);
  box-shadow:inset -3px -3px 10px rgba(0,0,0,.3),5px 5px 16px rgba(0,0,0,.35);
  backdrop-filter:blur(6px);
  overflow-wrap:break-word;
}

.prose section{
  padding-top:26px;
  margin-top:26px;
  border-top:4px solid rgba(173,216,230,.16);
}

.prose section:first-of-type{padding-top:0;margin-top:0;border-top:0}

.prose h2{font-size:clamp(1.35rem,5vw,1.95rem)}
.prose h3{font-size:19px;color:#d7fbef}

.prose ul,.prose ol{padding-left:1.35em;margin:0 0 1em}
.prose li{margin:0 0 .4em}

.prose figure{margin:18px 0}
.prose figure img{border-radius:4px;border:3px solid rgba(180,253,225,.24)}

.prose blockquote{
  margin:18px 0;
  padding:12px 16px;
  border-left:6px solid var(--sky);
  border-radius:4px;
  background:rgba(173,216,230,.1);
}

.prose table{width:100%;border-collapse:collapse;margin:16px 0;font-size:16px}
.prose th,.prose td{padding:8px 10px;border:2px solid rgba(180,253,225,.22);text-align:left}

.prose a{text-decoration:underline;text-underline-offset:3px}

small{
  display:inline-block;
  padding:2px 12px;
  font-family:var(--ff-b);
  font-size:16px;
  font-weight:600;
  color:#0f2119;
  border:3px solid #7fdcc0;
  border-radius:999px;
  background:var(--mint);
  box-shadow:inset -2px -2px 5px rgba(0,0,0,.16);
}

small + h2,small + h3{margin-top:10px}

/* ---------- 侧栏 ---------- */
.rail{
  align-self:start;
  padding:16px;
  border:4px solid rgba(173,216,230,.32);
  border-radius:4px;
  background:rgba(173,216,230,.1);
  box-shadow:inset -3px -3px 10px rgba(0,0,0,.3),5px 5px 14px rgba(0,0,0,.3);
}

.rail h2{font-size:22px;margin-bottom:12px}

.rail-list{display:grid;gap:8px;list-style:none;margin:0;padding:0}

.rail-list a{
  display:flex;
  align-items:center;
  min-height:40px;
  padding:5px 12px;
  font-size:16px;
  border:3px solid rgba(180,253,225,.24);
  border-radius:14px;
  background:rgba(180,253,225,.06);
  box-shadow:inset -2px -2px 6px rgba(0,0,0,.3),2px 2px 6px rgba(0,0,0,.28);
  transition:transform .2s cubic-bezier(.34,1.56,.64,1),background .2s;
}

.rail-list a:hover{background:rgba(180,253,225,.16);transform:translateX(2px)}

/* ---------- 页脚 ---------- */
.foot{
  margin-top:12px;
  padding:24px 14px 26px;
  border-top:4px solid rgba(180,253,225,.34);
  background:linear-gradient(180deg,rgba(24,40,33,.55),rgba(7,14,11,.92));
}

.foot-row{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:14px 20px;
  max-width:1180px;
  margin:0 auto;
}

.foot-mark{
  font-family:var(--ff-d);
  font-size:clamp(22px,6vw,38px);
  color:var(--mint);
  text-shadow:0 3px 0 rgba(0,0,0,.55);
}

.foot-nav ul{display:flex;flex-wrap:wrap;gap:4px 8px;list-style:none;margin:0;padding:0}

.foot-nav a{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  padding:4px 10px;
  font-size:16px;
  color:#ccefe2;
  border-radius:12px;
}

.foot-nav a:hover{color:#fff;background:rgba(180,253,225,.13)}

.copy{margin:0;font-size:16px;color:#a9cfc0}

/* ---------- 动效 ---------- */
.reveal{
  opacity:0;
  transform:translateY(16px);
  transition:opacity .5s ease-out,transform .55s cubic-bezier(.34,1.56,.64,1);
}

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

@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none;transition:none}
  *{animation-duration:.001ms !important;transition-duration:.001ms !important}
}

/* ---------- 桌面 ---------- */
@media (min-width:900px){
  body{padding-bottom:120px}

  .dock{flex-wrap:nowrap;gap:10px;padding:10px 18px calc(10px + env(safe-area-inset-bottom))}

  .is-left{order:0}
  .burger{order:1}
  .mark{order:2;flex:0 1 auto;font-size:22px}
  .is-right{order:3}
  .cta{order:4}

  .dock-list{flex:0 1 auto}

  .stage{grid-template-columns:minmax(0,1fr) 296px;gap:22px;margin-top:34px;padding:0 20px 40px}

  .rail{position:sticky;top:24px}

  .prose{padding:28px 32px}

  .hero{padding:82px 24px 92px}
}

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