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

:root {
  --void: #000000;
  --carbon-deep: #050505;
  --graphite: #0d0d0d;
  --surface: #141414;
  --diamond: #e8f4ff;
  --diamond-glow: rgba(200,230,255,0.12);
  --diamond-border: rgba(200,230,255,0.2);
  --graphene: rgba(80,160,220,0.15);
  --graphene-line: rgba(60,140,200,0.25);
  --coal: #2a2a2a;
  --graphite-text: #606060;
  --text: #505050;
  --text-bright: #c0c0c0;
  --white: #f0f0f0;
  --border: rgba(150,150,150,0.12);
  --accent: #c8d8ff;
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0;}
body{font-family:'Chakra Petch',sans-serif;background:var(--void);color:var(--text);min-height:100vh;overflow-x:hidden;}
#c-canvas{position:fixed;inset:0;z-index:0;pointer-events:none;}
.wrap{position:relative;z-index:2;max-width:1020px;margin:0 auto;padding:0 28px 90px;}

/* ── HERO ── */
.hero{padding:64px 0 52px;display:grid;grid-template-columns:1fr 240px;gap:40px;align-items:center;border-bottom:1px solid var(--border);margin-bottom:56px;}
.hero-tag{font-family:'Fira Mono',monospace;font-size:0.58rem;letter-spacing:4px;text-transform:uppercase;color:var(--graphite-text);opacity:0.7;margin-bottom:14px;}
.hero h1{font-size:clamp(4rem,12vw,8.5rem);font-weight:700;line-height:0.85;color:var(--white);letter-spacing:-2px;}
.hero h1 em{display:block;font-size:0.2em;font-style:normal;font-weight:300;letter-spacing:6px;color:var(--graphite-text);margin-top:12px;font-family:'Fira Mono',monospace;}
.hero-desc{font-size:0.95rem;line-height:1.85;color:var(--text);font-weight:300;margin-top:18px;}

/* ── Periodic card ── */
.periodic-card{width:220px;height:220px;background:linear-gradient(135deg,#0a0a0a,#1a1a1a);border:1px solid rgba(200,216,255,0.2);border-radius:8px;padding:18px;display:flex;flex-direction:column;justify-content:space-between;position:relative;overflow:hidden;}
.periodic-card::before{content:'';position:absolute;inset:0;background:radial-gradient(ellipse at 35% 35%,rgba(200,216,255,0.08),transparent 60%);}
.pc-num{font-family:'Fira Mono',monospace;font-size:0.85rem;color:rgba(200,216,255,0.5);font-weight:500;}
.pc-symbol{font-family:'Fira Mono',monospace;font-size:5rem;font-weight:500;color:var(--white);line-height:1;text-align:center;text-shadow:0 0 20px rgba(200,216,255,0.2);}
.pc-name{font-size:0.8rem;font-weight:600;color:var(--accent);text-align:center;letter-spacing:2px;text-transform:uppercase;}
.pc-mass{font-family:'Fira Mono',monospace;font-size:0.72rem;color:rgba(200,216,255,0.4);text-align:right;}

/* ── Props ── */
.props-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));border:1px solid var(--border);overflow:hidden;margin-bottom:56px;}
.prop{padding:18px 14px;background:var(--carbon-deep);border-right:1px solid var(--border);transition:background 0.2s;}
.prop:last-child{border-right:none;} .prop:hover{background:var(--diamond-glow);}
.p-label{font-family:'Fira Mono',monospace;font-size:0.52rem;letter-spacing:2px;text-transform:uppercase;color:var(--graphite-text);margin-bottom:7px;}
.p-value{font-size:1.05rem;font-weight:700;color:var(--diamond);line-height:1.1;}
.p-unit{font-size:0.6rem;color:#333;}

/* ── 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:'Fira Mono',monospace;font-size:0.55rem;letter-spacing:3px;color:var(--graphite-text);opacity:0.5;}
.section h2{font-size:1.5rem;font-weight:700;color:var(--white);text-transform:uppercase;letter-spacing:1px;}
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:600;}

/* ── Allotropes ── */
.allotropes{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:12px;margin-top:18px;}
.allo-card{background:var(--graphite);border:1px solid var(--border);border-radius:4px;padding:20px;position:relative;overflow:hidden;transition:border-color 0.3s,background 0.3s;}
.allo-card:hover{background:var(--surface);border-color:rgba(200,216,255,0.3);}
.allo-card::before{content:'';position:absolute;top:-30px;right:-30px;width:80px;height:80px;border-radius:50%;background:radial-gradient(circle,rgba(200,216,255,0.06),transparent 70%);pointer-events:none;}
.allo-name{font-size:1rem;font-weight:700;color:var(--white);margin-bottom:3px;}
.allo-formula{font-family:'Fira Mono',monospace;font-size:0.7rem;color:var(--accent);margin-bottom:10px;opacity:0.7;}
.allo-card p{font-size:0.8rem;margin:0;line-height:1.55;}

/* ── Hybridation table ── */
.hybri-table{width:100%;border-collapse:collapse;margin-top:18px;font-size:0.86rem;}
.hybri-table th{font-family:'Fira Mono',monospace;font-size:0.55rem;letter-spacing:2px;text-transform:uppercase;color:var(--graphite-text);border-bottom:1px solid var(--border);padding:10px 14px;text-align:left;font-weight:400;}
.hybri-table td{padding:10px 14px;border-bottom:1px solid rgba(255,255,255,0.04);color:var(--text);}
.hybri-table td:first-child{font-weight:700;color:var(--accent);font-family:'Fira Mono',monospace;}
.hybri-table tr:hover td{background:rgba(200,216,255,0.04);}

/* ── Carbon uses ── */
.uses-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:10px;margin-top:18px;}
.use-card{background:var(--graphite);border:1px solid var(--border);border-left:2px solid rgba(200,216,255,0.3);padding:16px;transition:border-left-color 0.3s;}
.use-card:hover{border-left-color:var(--diamond);}
.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;}

/* ── Discovery ── */
.disc-box{background:var(--graphite);border:1px solid var(--border);border-left:2px solid rgba(200,216,255,0.3);border-radius:4px;padding:24px 26px;margin-top:18px;}
.disc-box h3{font-size:0.82rem;font-weight:700;color:var(--text-bright);text-transform:uppercase;letter-spacing:1px;margin-bottom:10px;}
.disc-box p{margin:0 0 10px;} .disc-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:'Fira Mono',monospace;font-size:0.52rem;letter-spacing:2px;color:#2a2a2a;text-transform:uppercase;}
@media(max-width:640px){.hero{grid-template-columns:1fr;} .periodic-card{width:160px;height:160px;margin:0 auto;}}