@import url('https://fonts.googleapis.com/css2?family=Righteous&family=Inter:wght@200;300;400;500&display=swap');

:root {
  --void: #000000;
  --near: #050205;
  --deep: #0a040a;
  --neon-pink: #ff0066;
  --neon-orange: #ff6600;
  --neon-teal: #00ffcc;
  --neon-blue: #0066ff;
  --neon-white: #ffffff;
  --glow-pink: rgba(255,0,102,0.25);
  --glow-orange: rgba(255,102,0,0.2);
  --border-neon: rgba(255,0,102,0.3);
  --text: rgba(255,200,220,0.5);
  --text-bright: rgba(255,200,220,0.85);
  --text-dim: rgba(100,20,40,0.8);
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0;}
body{font-family:'Inter',sans-serif;background:var(--void);color:var(--text);min-height:100vh;overflow-x:hidden;}
#neon-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:72px 0 56px;text-align:center;border-bottom:1px solid var(--border-neon);margin-bottom:60px;}
.hero-tag{font-size:0.58rem;letter-spacing:6px;text-transform:uppercase;color:var(--neon-pink);opacity:0.6;margin-bottom:20px;font-weight:300;}

/* Neon sign effect for h1 */
.hero h1{
  font-family:'Righteous',sans-serif;
  font-size:clamp(5rem,16vw,12rem);
  font-weight:400;
  line-height:0.85;
  color:#fff;
  text-shadow:
    0 0 7px #fff,
    0 0 10px #fff,
    0 0 21px #fff,
    0 0 42px var(--neon-pink),
    0 0 82px var(--neon-pink),
    0 0 92px var(--neon-pink),
    0 0 102px var(--neon-pink);
  animation:neon-flicker 8s linear infinite;
}

.hero h1 em{
  display:block;font-size:0.2em;font-style:normal;font-family:'Inter',sans-serif;font-weight:200;
  letter-spacing:8px;color:var(--neon-orange);
  text-shadow:0 0 7px var(--neon-orange),0 0 20px var(--neon-orange),0 0 40px var(--neon-orange);
  margin-top:14px;text-transform:uppercase;animation:none;
}

@keyframes neon-flicker{
  0%,18%,20%,50.1%,60%,65.1%,80%,90.1%,92%,100%{
    text-shadow:0 0 7px #fff,0 0 10px #fff,0 0 21px #fff,0 0 42px var(--neon-pink),0 0 82px var(--neon-pink),0 0 92px var(--neon-pink);
  }
  18.1%,20.1%,30%,50%,60.1%,65%,80.1%,90%{
    text-shadow:none;color:rgba(255,200,220,0.6);
  }
}

.hero-desc{max-width:560px;margin:28px auto 0;font-size:0.95rem;line-height:1.88;color:var(--text);font-weight:300;}

/* ── Periodic card — neon tube style ── */
.pc-wrap{display:flex;justify-content:center;margin-bottom:60px;}
.periodic-card{
  width:220px;height:220px;background:var(--near);
  border:2px solid var(--neon-pink);
  border-radius:4px;
  padding:18px;display:flex;flex-direction:column;justify-content:space-between;
  box-shadow:0 0 15px var(--neon-pink),0 0 30px rgba(255,0,102,0.15),inset 0 0 15px rgba(255,0,102,0.05);
}
.pc-num{font-size:0.9rem;color:var(--neon-pink);font-family:'Righteous',sans-serif;text-shadow:0 0 8px var(--neon-pink);}
.pc-symbol{font-family:'Righteous',sans-serif;font-size:5rem;color:#fff;line-height:1;text-align:center;text-shadow:0 0 10px #fff,0 0 20px var(--neon-pink),0 0 40px var(--neon-pink);}
.pc-name{font-size:0.8rem;color:var(--neon-orange);text-align:center;letter-spacing:3px;text-transform:uppercase;text-shadow:0 0 8px var(--neon-orange);}
.pc-mass{font-size:0.7rem;color:rgba(255,102,0,0.5);text-align:right;font-family:'Inter',monospace;}

/* ── Stats ── */
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(145px,1fr));border:1px solid var(--border-neon);overflow:hidden;margin-bottom:56px;border-radius:2px;}
.stat{padding:18px 14px;background:var(--near);border-right:1px solid var(--border-neon);transition:background 0.2s;}
.stat:last-child{border-right:none;} .stat:hover{background:var(--glow-pink);}
.s-label{font-size:0.52rem;letter-spacing:3px;text-transform:uppercase;color:var(--neon-pink);opacity:0.6;margin-bottom:7px;font-weight:500;}
.s-value{font-family:'Righteous',sans-serif;font-size:1.1rem;color:#fff;line-height:1.1;text-shadow:0 0 8px var(--neon-pink);}
.s-unit{font-size:0.6rem;color:var(--text-dim);}

/* ── Sections ── */
.section{margin-bottom:56px;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-neon);}
.sn{font-size:0.55rem;letter-spacing:3px;color:var(--neon-pink);opacity:0.4;}
.section h2{font-family:'Righteous',sans-serif;font-size:1.5rem;color:#fff;letter-spacing:2px;text-transform:uppercase;text-shadow:0 0 10px var(--neon-pink);}
p{font-size:0.95rem;line-height:1.87;color:var(--text);font-weight:300;margin-bottom:14px;}
strong{color:var(--text-bright);font-weight:500;}

/* ── Noble gases row ── */
.nobles-row{display:grid;grid-template-columns:repeat(6,1fr);gap:8px;margin-top:18px;}
.noble{background:var(--near);border:1px solid rgba(255,102,0,0.25);border-radius:3px;padding:12px 8px;text-align:center;transition:box-shadow 0.3s;}
.noble.active{border-color:var(--neon-pink);box-shadow:0 0 10px var(--neon-pink),inset 0 0 8px rgba(255,0,102,0.1);}
.noble:hover{box-shadow:0 0 8px var(--neon-orange);}
.noble .sym{font-family:'Righteous',sans-serif;font-size:1.1rem;color:#fff;display:block;text-shadow:0 0 8px var(--neon-orange);}
.noble .num{font-size:0.6rem;color:var(--neon-orange);opacity:0.6;}
.noble .name{font-size:0.6rem;color:rgba(255,200,200,0.4);margin-top:2px;}

/* ── Emission spectrum ── */
.spectrum-wrap{background:var(--near);border:1px solid var(--border-neon);border-radius:4px;padding:20px;margin-top:18px;}
#spectrum-canvas{display:block;margin:0 auto 10px;border-radius:2px;}
.spec-cap{font-size:0.58rem;text-align:center;color:rgba(255,0,102,0.35);letter-spacing:2px;text-transform:uppercase;}

/* ── Uses ── */
.uses-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:10px;margin-top:18px;}
.use-card{background:var(--near);border:1px solid var(--border-neon);border-left:2px solid var(--neon-pink);padding:16px;transition:box-shadow 0.2s;}
.use-card:hover{box-shadow:0 0 12px rgba(255,0,102,0.15);}
.use-card h3{font-size:0.8rem;font-weight:600;color:var(--neon-orange);text-transform:uppercase;letter-spacing:0.5px;margin-bottom:6px;text-shadow:0 0 6px var(--neon-orange);}
.use-card p{font-size:0.78rem;margin:0;line-height:1.55;}

/* ── Discovery ── */
.disc-box{background:var(--near);border:1px solid rgba(255,102,0,0.3);border-left:2px solid var(--neon-orange);padding:24px 26px;margin-top:18px;}
.disc-box h3{font-size:0.8rem;color:var(--neon-orange);text-transform:uppercase;letter-spacing:1px;margin-bottom:10px;font-weight:600;text-shadow:0 0 6px var(--neon-orange);}
.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-neon);padding-top:20px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px;}
.footer-band span{font-size:0.52rem;letter-spacing:2px;color:rgba(100,20,40,0.6);text-transform:uppercase;}
@media(max-width:600px){.nobles-row{grid-template-columns:repeat(3,1fr);}  .hero h1{letter-spacing:-1px;}}