/* ===== 天衡纪元 AEGIS TIANHENG · style.css ===== */
:root{
  --bg:#04080F; --bg2:#0A1420; --panel:#0D1B2A; --line:rgba(111,211,231,.14);
  --accent:#6FD3E7; --accent-dim:rgba(111,211,231,.35);
  --text:#EAF3F8; --muted:#8CA8BB; --gold:#D8B36A;
  --radius:14px; --maxw:1120px;
  --font-cn:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",sans-serif;
  --font-en:"Helvetica Neue",Arial,"Segoe UI",Roboto,sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--text);font-family:var(--font-cn);line-height:1.7;overflow-x:hidden}
h1,h2,h3,h4{line-height:1.25;font-weight:700}
a{color:inherit;text-decoration:none}
img{max-width:100%}

/* ---- nav ---- */
#nav{position:fixed;top:0;left:0;right:0;z-index:100;backdrop-filter:blur(14px);
  background:rgba(4,8,15,.72);border-bottom:1px solid var(--line)}
.nav-inner{max-width:var(--maxw);margin:0 auto;padding:0 24px;height:64px;display:flex;align-items:center;justify-content:space-between}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;letter-spacing:2px}
.brand-logo{width:28px;height:28px}
.nav-links{display:flex;gap:26px;font-size:15px;color:var(--muted)}
.nav-links a{transition:color .2s}
.nav-links a:hover{color:var(--accent)}
.nav-right{display:flex;align-items:center;gap:12px}
.lang-toggle{background:transparent;border:1px solid var(--accent-dim);color:var(--accent);
  border-radius:999px;padding:4px 14px;font-size:13px;cursor:pointer;font-family:var(--font-en);letter-spacing:1px}
.lang-toggle:hover{background:rgba(111,211,231,.1)}
.menu-btn{display:none;background:none;border:none;color:var(--text);font-size:22px;cursor:pointer}

/* ---- hero ---- */
.hero{position:relative;min-height:100vh;display:flex;align-items:center;justify-content:center;text-align:center;overflow:hidden}
#stars{position:absolute;inset:0;width:100%;height:100%}
.hero-glow{position:absolute;left:50%;top:58%;width:900px;height:900px;transform:translate(-50%,-50%);
  background:radial-gradient(circle,rgba(111,211,231,.13) 0%,transparent 60%);pointer-events:none}
.hero-content{position:relative;z-index:2;padding:120px 24px 80px;max-width:860px}
.hero-kicker{color:var(--accent);letter-spacing:6px;font-size:14px;margin-bottom:22px}
.hero-title{font-size:clamp(56px,10vw,110px);letter-spacing:10px;font-weight:800;
  background:linear-gradient(180deg,#fff 20%,var(--accent) 90%);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero-sub{color:var(--muted);letter-spacing:5px;font-size:15px;margin-top:8px;font-family:var(--font-en)}
.hero-hook{margin:36px auto 0;max-width:620px;font-size:clamp(17px,2.4vw,22px);color:#C8DCE8;font-weight:500}
.hero-cta{margin-top:44px;display:flex;gap:16px;justify-content:center;flex-wrap:wrap}
.btn{padding:13px 32px;border-radius:999px;font-size:15px;letter-spacing:2px;transition:all .25s}
.btn-primary{background:var(--accent);color:#04121C;font-weight:700}
.btn-primary:hover{box-shadow:0 0 32px rgba(111,211,231,.45);transform:translateY(-2px)}
.btn-ghost{border:1px solid var(--accent-dim);color:var(--accent)}
.btn-ghost:hover{background:rgba(111,211,231,.08)}
.hero-fade{position:absolute;bottom:0;left:0;right:0;height:180px;background:linear-gradient(180deg,transparent,var(--bg));z-index:1}

/* ---- stats ---- */
.stats{max-width:var(--maxw);margin:0 auto;padding:56px 24px;display:grid;grid-template-columns:repeat(4,1fr);gap:20px;text-align:center}
.stat-num{font-size:clamp(34px,4.6vw,52px);font-weight:800;color:var(--accent);font-family:var(--font-en)}
.stat-label{color:var(--muted);font-size:14px;margin-top:4px;letter-spacing:1px}

/* ---- sections ---- */
.section{max-width:var(--maxw);margin:0 auto;padding:96px 24px 24px}
.sec-kicker{color:var(--accent);letter-spacing:5px;font-size:13px;font-family:var(--font-en);margin-bottom:10px}
.sec-title{font-size:clamp(28px,4.4vw,44px);letter-spacing:2px;margin-bottom:36px}
.sec-desc{color:var(--muted);max-width:720px;margin:-18px 0 36px}

/* universe */
.universe-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.uni-card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:30px 26px}
.uni-card h3{color:var(--accent);font-size:19px;margin-bottom:12px;letter-spacing:1px}
.uni-card p{color:#B9CFDD;font-size:15px}

/* timeline */
.tl{position:relative;margin-top:12px;padding-left:34px;border-left:2px solid var(--accent-dim)}
.tl-item{position:relative;padding:0 0 44px 26px}
.tl-item::before{content:"";position:absolute;left:-43px;top:6px;width:16px;height:16px;border-radius:50%;
  background:var(--bg);border:3px solid var(--accent);box-shadow:0 0 14px rgba(111,211,231,.6)}
.tl-year{font-family:var(--font-en);color:var(--accent);font-weight:700;letter-spacing:2px;font-size:15px}
.tl-body h3{font-size:21px;margin:6px 0 10px;letter-spacing:1px}
.tl-body p{color:#B9CFDD;max-width:760px;font-size:15px}

/* fleet */
.fleet-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.fleet-card{background:linear-gradient(160deg,var(--panel),#081320);border:1px solid var(--line);
  border-radius:var(--radius);padding:28px 26px;transition:transform .25s,border-color .25s}
.fleet-card:hover{transform:translateY(-4px);border-color:var(--accent-dim)}
.fleet-card-wide{grid-column:span 3}
.fleet-glyph{font-size:30px;font-weight:800;color:var(--gold);letter-spacing:6px;margin-bottom:8px}
.fleet-card h3{font-family:var(--font-en);letter-spacing:3px;font-size:16px;color:var(--accent)}
.fleet-role{display:inline-block;margin:6px 0 12px;font-size:13px;color:var(--muted);
  border:1px solid var(--line);border-radius:999px;padding:2px 12px;letter-spacing:1px}
.fleet-card p:last-child{color:#B9CFDD;font-size:14px}

/* signals */
.sig-chain{display:flex;align-items:stretch;gap:10px;flex-wrap:wrap}
.sig-node{flex:1;min-width:150px;background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:22px 18px;text-align:center}
.sig-node-hot{border-color:var(--gold);box-shadow:0 0 24px rgba(216,179,106,.15)}
.sig-year{font-family:var(--font-en);font-size:24px;font-weight:800;color:var(--accent)}
.sig-node-hot .sig-year{color:var(--gold)}
.sig-node h4{margin:8px 0 6px;font-size:16px;letter-spacing:1px}
.sig-node p{color:var(--muted);font-size:13px}
.sig-arrow{align-self:center;color:var(--accent-dim);font-size:20px}

/* fortress */
.fort-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.fort-spec{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:28px 24px;text-align:center}
.fort-num{font-family:var(--font-en);font-size:clamp(26px,3.4vw,38px);font-weight:800;color:var(--accent)}
.fort-num span{font-size:16px;margin-left:2px}
.fort-spec p{color:var(--muted);font-size:13px;margin-top:8px}
.fort-quote{margin:44px auto 0;max-width:680px;text-align:center;font-size:clamp(17px,2.4vw,22px);color:#C8DCE8}

/* archive */
.video-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;min-height:120px}
.video-card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:transform .25s}
.video-card:hover{transform:translateY(-4px)}
.video-thumb{aspect-ratio:16/9;background:linear-gradient(135deg,#0D2438,#081320);display:flex;align-items:center;justify-content:center;color:var(--accent-dim);font-size:34px}
.video-body{padding:16px 18px}
.video-body h4{font-size:15px;letter-spacing:1px}
.video-body p{color:var(--muted);font-size:13px;margin-top:6px}
.video-empty{grid-column:1/-1;text-align:center;color:var(--muted);border:1px dashed var(--accent-dim);
  border-radius:var(--radius);padding:44px 20px;font-size:15px}

/* disclosure / footer */
.disclosure{max-width:860px;margin:80px auto 0;padding:0 24px 40px;color:var(--muted);font-size:13px;line-height:1.9;text-align:center}
footer{border-top:1px solid var(--line);margin-top:40px}
.footer-inner{max-width:var(--maxw);margin:0 auto;padding:40px 24px 48px;text-align:center}
.footer-brand{display:flex;align-items:center;justify-content:center;gap:10px;font-family:var(--font-en);letter-spacing:3px;font-weight:700}
.footer-line{color:var(--accent);letter-spacing:4px;margin:14px 0 8px;font-size:15px}
.footer-copy{color:var(--muted);font-size:13px}

/* reveal animation */
.reveal{opacity:0;transform:translateY(24px);transition:opacity .7s ease,transform .7s ease}
.reveal.visible{opacity:1;transform:none}

/* responsive */
@media (max-width:860px){
  .universe-grid,.fleet-grid,.fort-grid,.video-grid{grid-template-columns:1fr 1fr}
  .fleet-card-wide{grid-column:span 2}
  .stats{grid-template-columns:repeat(2,1fr)}
  .nav-links{position:fixed;top:64px;right:0;flex-direction:column;background:rgba(4,8,15,.97);
    padding:20px 28px;border-left:1px solid var(--line);border-bottom:1px solid var(--line);
    transform:translateX(110%);transition:transform .3s}
  .nav-links.open{transform:none}
  .menu-btn{display:block}
}
@media (max-width:560px){
  .universe-grid,.fleet-grid,.fort-grid,.video-grid{grid-template-columns:1fr}
  .fleet-card-wide{grid-column:span 1}
  .sig-arrow{display:none}
  .hero-title{letter-spacing:6px}
}