/* ===== Aurora Nova · 全站样式 ===== */

:root{
  --bg:#05060f;
  --fg:#e8ecf7;
  --muted:#8a93ad;
  --line:rgba(255,255,255,.08);
  --green:#4ade80;
  --teal:#2dd4bf;
  --violet:#a78bfa;
  --pink:#f472b6;
}

*{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%}

body{
  background:var(--bg);
  color:var(--fg);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  line-height:1.75;
  overflow-x:hidden;
  position:relative;
  -webkit-font-smoothing:antialiased;
}

/* ---------- 极光背景 ---------- */
.aurora{position:fixed;inset:0;z-index:0;overflow:hidden;pointer-events:none}
.blob{
  position:absolute;border-radius:50%;
  filter:blur(90px);
  opacity:.45;
  animation:float 18s ease-in-out infinite;
}
.blob.b1{width:520px;height:520px;background:var(--green);top:-180px;left:-120px}
.blob.b2{width:460px;height:460px;background:var(--teal);top:80px;right:-160px;animation-delay:-6s}
.blob.b3{width:420px;height:420px;background:var(--violet);bottom:-200px;left:30%;animation-delay:-12s}
.blob.b4{width:320px;height:320px;background:var(--pink);bottom:60px;right:10%;opacity:.25;animation-delay:-3s}
@keyframes float{
  0%,100%{transform:translate(0,0) scale(1)}
  33%{transform:translate(40px,-30px) scale(1.08)}
  66%{transform:translate(-30px,20px) scale(.95)}
}

.stars{
  position:fixed;inset:0;z-index:0;pointer-events:none;opacity:.5;
  background-image:radial-gradient(1px 1px at 20% 30%,#fff,transparent),
                   radial-gradient(1px 1px at 70% 15%,#fff,transparent),
                   radial-gradient(1px 1px at 40% 70%,#fff,transparent),
                   radial-gradient(1px 1px at 85% 60%,#fff,transparent),
                   radial-gradient(1px 1px at 10% 80%,#fff,transparent),
                   radial-gradient(1px 1px at 55% 45%,#fff,transparent);
}

/* ---------- 顶部导航 ---------- */
.topbar{position:relative;z-index:3;padding:26px 0 0}
.topbar-inner{
  max-width:760px;margin:0 auto;padding:0 24px;
  display:flex;align-items:center;justify-content:space-between;gap:16px;
}
.brand{
  font-size:15px;font-weight:700;letter-spacing:-.01em;
  color:var(--fg);text-decoration:none;
}
.brand i{font-style:normal;color:var(--teal)}
.topnav{display:flex;gap:20px}
.topnav a{
  font-size:14px;color:var(--muted);text-decoration:none;
  transition:color .2s ease;position:relative;padding-bottom:2px;
}
.topnav a:hover{color:var(--fg)}
.topnav a.on{color:var(--fg)}
.topnav a.on::after{
  content:"";position:absolute;left:0;right:0;bottom:-3px;height:1px;
  background:linear-gradient(90deg,var(--teal),var(--violet));
}

/* ---------- 主内容 ---------- */
main{
  position:relative;z-index:1;
  max-width:760px;
  margin:0 auto;
  padding:clamp(40px,9vh,110px) 24px 56px;
  animation:rise .9s cubic-bezier(.2,.7,.3,1) both;
}
@keyframes rise{from{opacity:0;transform:translateY(18px)}to{opacity:1;transform:none}}

.badge{
  display:inline-flex;align-items:center;gap:8px;
  font-size:13px;color:var(--muted);
  border:1px solid var(--line);
  border-radius:999px;
  padding:6px 14px;
  margin-bottom:28px;
  background:rgba(255,255,255,.03);
  backdrop-filter:blur(6px);
}
.dot{
  width:7px;height:7px;border-radius:50%;background:var(--green);
  box-shadow:0 0 12px var(--green);
  animation:pulse 2.4s ease-in-out infinite;
}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.35}}

h1{
  font-size:clamp(40px,9vw,68px);
  line-height:1.1;
  letter-spacing:-.02em;
  font-weight:700;
  background:linear-gradient(100deg,var(--green),var(--teal) 40%,var(--violet) 75%,var(--pink));
  -webkit-background-clip:text;background-clip:text;
  -webkit-text-fill-color:transparent;
  margin-bottom:20px;
}

.lead{
  font-size:clamp(16px,2.6vw,19px);
  color:var(--muted);
  max-width:52ch;
  margin-bottom:44px;
}
.lead strong{color:var(--fg);font-weight:600}

/* ---------- 卡片 ---------- */
.grid{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:14px;
  margin-bottom:44px;
}
.card{
  border:1px solid var(--line);
  border-radius:16px;
  padding:20px 18px;
  background:rgba(255,255,255,.025);
  transition:transform .3s ease,border-color .3s ease,background .3s ease;
}
.card:hover{transform:translateY(-4px);border-color:rgba(255,255,255,.18);background:rgba(255,255,255,.05)}
.card h3{
  font-size:13px;font-weight:600;color:var(--muted);
  letter-spacing:.08em;text-transform:uppercase;margin-bottom:10px;
}
.card p{font-size:15px;color:var(--fg);opacity:.9}

/* ---------- 链接按钮 ---------- */
.links{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:56px}
.links a{
  display:inline-flex;align-items:center;gap:7px;
  font-size:14px;color:var(--fg);text-decoration:none;
  border:1px solid var(--line);border-radius:10px;
  padding:9px 16px;
  background:rgba(255,255,255,.03);
  transition:all .25s ease;
}
.links a:hover{border-color:var(--teal);color:var(--teal);background:rgba(45,212,191,.08)}
.links a span{opacity:.5;font-size:12px}

/* ---------- 子页面标题 ---------- */
.page-head{margin-bottom:40px}
.page-title{
  font-size:clamp(30px,6vw,44px);
  line-height:1.15;font-weight:700;letter-spacing:-.02em;
  margin-bottom:14px;
  background:linear-gradient(100deg,var(--green),var(--teal) 50%,var(--violet));
  -webkit-background-clip:text;background-clip:text;
  -webkit-text-fill-color:transparent;
}
.page-sub{font-size:16px;color:var(--muted);max-width:46ch}

/* ---------- 文字段落 ---------- */
.prose{max-width:60ch;margin-bottom:40px}
.prose p{font-size:16px;color:var(--fg);opacity:.86;margin-bottom:18px}
.prose p:last-child{margin-bottom:0}
.prose strong{color:var(--fg);font-weight:600;opacity:1}

/* ---------- 列表条目 ---------- */
.list{margin-bottom:40px}
.item{
  display:block;
  padding:20px 0;
  border-top:1px solid var(--line);
  text-decoration:none;color:inherit;
  transition:padding-left .25s ease;
}
.item:last-child{border-bottom:1px solid var(--line)}
.item:hover{padding-left:6px}
.item-top{
  display:flex;align-items:baseline;justify-content:space-between;
  gap:12px;margin-bottom:6px;
}
.item h3{font-size:16px;font-weight:600;color:var(--fg)}
.item time{font-size:12px;color:var(--muted);font-variant-numeric:tabular-nums;white-space:nowrap}
.item p{font-size:14px;color:var(--muted)}
.item:hover h3{color:var(--teal)}

/* ---------- 返回链接 ---------- */
.back{
  display:inline-flex;align-items:center;gap:6px;
  font-size:14px;color:var(--muted);text-decoration:none;
  margin-bottom:80px;transition:color .2s ease;
}
.back:hover{color:var(--teal)}

/* ---------- 页脚 ---------- */
footer{
  position:relative;z-index:1;
  max-width:760px;margin:0 auto;padding:0 24px 48px;
}
.foot-inner{
  border-top:1px solid var(--line);
  padding-top:22px;
  display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;
  font-size:13px;color:var(--muted);
}
.foot-inner a{color:var(--muted);text-decoration:none;border-bottom:1px dotted rgba(255,255,255,.2)}
.foot-inner a:hover{color:var(--teal)}

/* ---------- 手机 ---------- */
@media (max-width:640px){
  .grid{grid-template-columns:1fr}
  .foot-inner{flex-direction:column;gap:8px}
  .topnav{gap:14px}
  .topnav a{font-size:13px}
  .item-top{flex-direction:column;gap:2px}
}