@import url('https://fonts.googleapis.com/css2?family=Aldrich&family=Roboto+Condensed:wght@300;400;700&display=swap');

:root {
  --void: #000000;
  --pit: #020504;
  --deep: #040a08;
  --bunker: #081208;
  --cherenkov: #00ff88;
  --cherenkov-dim: rgba(0,255,136,0.08);
  --cherenkov-border: rgba(0,255,136,0.18);
  --nuclear: #40ff80;
  --radiation: rgba(0,255,100,0.15);
  --warning: #ffcc00;
  --warning-dim: rgba(255,200,0,0.08);
  --text: #2a6040;
  --text-bright: #60c080;
  --text-dim: #0a1e10;
  --border: rgba(0,255,136,0.15);
  --white: #e0ffe8;
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0;}
body{font-family:'Roboto Condensed',sans-serif;background:var(--void);color:var(--text);min-height:100vh;overflow-x:hidden;}
#u-canvas{position:fixed;inset:0;z-index:0;pointer-events:none;}
body::before{content:'U';position:fixed;top:50%;left:50%;transform:translate(-50%,-50%);font-family:'Aldrich',sans-serif;font-size:55vw;font-weight:400;opacity:0.02;z-index:1;pointer-events:none;color:var(--cherenkov);}
.wrap{position:relative;z-index:2;max-width:1040px;margin:0 auto;padding:0 28px 90px;}

/* ── HERO ── */
.hero{padding:68px 0 52px;display:grid;grid-template-columns:1fr 260px;gap:44px;align-items:center;border-bottom:1px solid var(--border);margin-bottom:56px;}
.hero-tag{font-family:'Aldrich',sans-serif;font-size:0.58rem;letter-spacing:5px;text-transform:uppercase;color:var(--cherenkov);opacity:0.5;margin-bottom:14px;}
.hero h1{font-family:'Aldrich',sans-serif;font-size:clamp(4rem,12vw,8.5rem);line-height:0.85;color:var(--white);letter-spacing:-1px;text-shadow:0 0 30px rgba(0,255,136,0.2),0 0 60px rgba(0,255,136,0.1);}
.hero h1 em{display:block;font-size:0.2em;font-style:normal;letter-spacing:5px;color:var(--text-dim);text-shadow:none;margin-top:12px;font-family:'Roboto Condensed',sans-serif;text-transform:uppercase;}
.hero-desc{font-size:0.95rem;line-height:1.85;color:var(--text);font-weight:300;margin-top:18px;}

/* ── Periodic card ── */
.periodic-card{width:240px;height:240px;background:linear-gradient(135deg,var(--pit),var(--deep));border:1px solid var(--cherenkov-border);border-radius:4px;padding:18px;display:flex;flex-direction:column;justify-content:space-between;position:relative;overflow:hidden;box-shadow:0 0 20px var(--cherenkov-dim),0 0 50px rgba(0,255,136,0.05);}
.periodic-card::before{content:'';position:absolute;inset:0;background:radial-gradient(ellipse at 40% 40%,rgba(0,255,136,0.06),transparent 60%);}
.pc-num{font-family:'Aldrich',sans-serif;font-size:0.85rem;color:var(--cherenkov);opacity:0.5;}
.pc-symbol{font-family:'Aldrich',sans-serif;font-size:5rem;color:var(--white);line-height:1;text-align:center;text-shadow:0 0 20px rgba(0,255,136,0.3);}
.pc-name{font-size:0.8rem;font-weight:700;color:var(--cherenkov);text-align:center;letter-spacing:2px;text-transform:uppercase;}
.pc-mass{font-family:'Roboto Condensed',monospace;font-size:0.72rem;color:var(--text-dim);text-align:right;}
.pc-act{font-size:0.6rem;color:rgba(0,255,136,0.35);text-align:center;letter-spacing:2px;text-transform:uppercase;margin-top:2px;}

/* ── Warning banner ── */
.warning-banner{background:var(--warning-dim);border:1px solid rgba(255,200,0,0.3);border-radius:4px;padding:14px 20px;margin-bottom:56px;display:flex;align-items:center;gap:14px;}
.warn-icon{font-size:1.6rem;flex-shrink:0;}
.warn-text{font-family:'Aldrich',sans-serif;font-size:0.72rem;letter-spacing:2px;text-transform:uppercase;color:rgba(255,200,0,0.65);line-height:1.5;}

/* ── Stats ── */
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(148px,1fr));border:1px solid var(--border);overflow:hidden;margin-bottom:56px;}
.stat{padding:18px 14px;background:var(--pit);border-right:1px solid var(--border);transition:background 0.2s;}
.stat:last-child{border-right:none;} .stat:hover{background:var(--cherenkov-dim);}
.s-label{font-family:'Aldrich',sans-serif;font-size:0.52rem;letter-spacing:2px;text-transform:uppercase;color:var(--cherenkov);opacity:0.45;margin-bottom:7px;}
.s-value{font-size:1.05rem;font-weight:700;color:var(--white);line-height:1.1;}
.s-unit{font-size:0.6rem;color:var(--text-dim);}

/* ── Sections ── */
.section{margin-bottom:54px;opacity:0;transform:translateY(18px);transition:opacity 0.65s,transform 0.65s;}
.section.visible{opacity:1;transform:none;}
.sh{display:flex;align-items:baseline;gap:14px;margin-bottom:20px;padding-bottom:12px;border-bottom:1px solid var(--border);}
.sn{font-family:'Aldrich',sans-serif;font-size:0.55rem;letter-spacing:3px;color:var(--cherenkov);opacity:0.35;}
.section h2{font-family:'Aldrich',sans-serif;font-size:1.4rem;color:var(--white);text-transform:uppercase;letter-spacing:2px;}
p{font-size:0.95rem;line-height:1.85;color:var(--text);font-weight:300;margin-bottom:14px;}
strong{color:var(--text-bright);font-weight:700;}

/* ── Isotopes grid ── */
.iso-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:10px;margin-top:18px;}
.iso-card{background:var(--pit);border:1px solid var(--border);border-top:2px solid var(--cherenkov);padding:18px;transition:background 0.2s;}
.iso-card:hover{background:var(--cherenkov-dim);}
.iso-card h3{font-family:'Aldrich',sans-serif;font-size:0.9rem;color:var(--white);margin-bottom:4px;text-shadow:0 0 8px rgba(0,255,136,0.2);}
.iso-hl{font-size:0.65rem;letter-spacing:2px;text-transform:uppercase;color:var(--cherenkov);opacity:0.6;margin-bottom:8px;font-weight:700;}
.iso-card p{font-size:0.78rem;margin:0;line-height:1.55;}

/* ── Nuclear chain canvas ── */
.fission-wrap{background:var(--pit);border:1px solid var(--border);border-radius:4px;padding:20px;margin-top:18px;text-align:center;}
#fission-canvas{display:block;margin:0 auto 10px;}
.fis-cap{font-family:'Aldrich',sans-serif;font-size:0.58rem;color:rgba(0,255,136,0.25);letter-spacing:2px;text-transform:uppercase;}

/* ── Applications ── */
.uses-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:10px;margin-top:18px;}
.use-card{background:var(--pit);border:1px solid var(--border);border-left:2px solid var(--cherenkov);padding:16px;transition:background 0.2s;}
.use-card:hover{background:var(--cherenkov-dim);}
.use-card h3{font-size:0.8rem;font-weight:700;color:var(--text-bright);text-transform:uppercase;letter-spacing:0.5px;margin-bottom:6px;}
.use-card p{font-size:0.78rem;margin:0;line-height:1.5;}

/* ── History ── */
.hist-box{background:var(--pit);border:1px solid rgba(0,255,136,0.18);border-left:2px solid var(--cherenkov);padding:24px 26px;margin-top:18px;}
.hist-box h3{font-family:'Aldrich',sans-serif;font-size:0.78rem;color:var(--cherenkov);text-transform:uppercase;letter-spacing:2px;margin-bottom:10px;opacity:0.7;}
.hist-box p{margin:0 0 12px;} .hist-box p:last-child{margin:0;}

.footer-band{margin-top:70px;border-top:1px solid var(--border);padding-top:20px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px;}
.footer-band span{font-family:'Aldrich',sans-serif;font-size:0.5rem;letter-spacing:2px;color:var(--text-dim);text-transform:uppercase;}
@media(max-width:640px){.hero{grid-template-columns:1fr;} .periodic-card{width:180px;height:180px;margin:0 auto;}}