@import url('https://fonts.googleapis.com/css2?family=Syne:wght@400;500;600;700;800&family=Syne+Mono&display=swap');

:root {
  --obsidian: #030508;
  --deep: #060a10;
  --surface: #0c121e;
  --silver-void: #101820;
  --mercury: #b8c8d8;
  --mercury-bright: #dce8f0;
  --mercury-glow: rgba(184,200,216,0.12);
  --mercury-border: rgba(184,200,216,0.2);
  --mirror: rgba(220,235,248,0.08);
  --droplet: rgba(200,220,240,0.15);
  --text: #4a6070;
  --text-bright: #98b8c8;
  --text-dim: #182030;
  --border: rgba(184,200,216,0.15);
  --white: #e8f0f8;
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0;}
body{font-family:'Syne',sans-serif;background:var(--obsidian);color:var(--text);min-height:100vh;overflow-x:hidden;}
#hg-canvas{position:fixed;inset:0;z-index:0;pointer-events:none;}
body::before{content:'Hg';position:fixed;top:50%;left:50%;transform:translate(-50%,-50%);font-family:'Syne Mono',monospace;font-size:40vw;font-weight:800;opacity:0.022;z-index:1;pointer-events:none;color:var(--mercury);}
.wrap{position:relative;z-index:2;max-width:1020px;margin:0 auto;padding:0 28px 90px;}

/* ── HERO ── */
.hero{padding:68px 0 52px;display:grid;grid-template-columns:260px 1fr;gap:48px;align-items:center;border-bottom:1px solid var(--border);margin-bottom:56px;}

/* ── Mercury droplet visual ── */
.droplet-wrap{position:relative;width:240px;height:240px;display:flex;align-items:center;justify-content:center;}
#droplet-canvas{display:block;}

.hero-tag{font-family:'Syne Mono',monospace;font-size:0.58rem;letter-spacing:4px;text-transform:uppercase;color:var(--mercury);opacity:0.5;margin-bottom:14px;}
.hero h1{font-size:clamp(4rem,11vw,7.5rem);font-weight:800;line-height:0.85;color:var(--white);letter-spacing:-3px;
  background:linear-gradient(180deg,var(--mercury-bright) 0%,var(--mercury) 50%,#6888a0 100%);
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;}
.hero h1 em{display:block;font-size:0.2em;font-style:normal;font-weight:400;letter-spacing:6px;color:var(--text-dim);-webkit-text-fill-color:var(--text-dim);margin-top:12px;font-family:'Syne Mono',monospace;text-transform:uppercase;}
.hero-desc{font-size:0.95rem;line-height:1.85;color:var(--text);font-weight:400;margin-top:18px;}

/* ── Periodic card ── */
.periodic-card{width:220px;height:220px;background:linear-gradient(135deg,var(--deep),var(--surface));border:1px solid var(--mercury-border);border-radius:6px;padding:18px;display:flex;flex-direction:column;justify-content:space-between;position:relative;overflow:hidden;box-shadow:0 0 30px var(--mercury-glow);}
.periodic-card::before{content:'';position:absolute;inset:0;background:radial-gradient(ellipse at 40% 35%,rgba(220,235,248,0.06),transparent 60%);}
.pc-num{font-family:'Syne Mono',monospace;font-size:0.85rem;color:var(--mercury);opacity:0.55;}
.pc-symbol{font-family:'Syne Mono',monospace;font-size:5rem;font-weight:800;color:var(--white);line-height:1;text-align:center;text-shadow:0 0 20px var(--mercury-glow);}
.pc-name{font-size:0.8rem;font-weight:600;color:var(--text-bright);text-align:center;letter-spacing:2px;text-transform:uppercase;}
.pc-mass{font-family:'Syne Mono',monospace;font-size:0.72rem;color:var(--text-dim);text-align:right;}

/* ── 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(--deep);border-right:1px solid var(--border);transition:background 0.2s;}
.stat:last-child{border-right:none;} .stat:hover{background:var(--mercury-glow);}
.s-label{font-family:'Syne Mono',monospace;font-size:0.52rem;letter-spacing:2px;text-transform:uppercase;color:var(--mercury);opacity:0.5;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:'Syne Mono',monospace;font-size:0.55rem;letter-spacing:3px;color:var(--mercury);opacity:0.4;}
.section h2{font-size:1.5rem;font-weight:800;color:var(--white);letter-spacing:-0.5px;}
p{font-size:0.95rem;line-height:1.85;color:var(--text);font-weight:400;margin-bottom:14px;}
strong{color:var(--text-bright);font-weight:600;}

/* ── Alloys ── */
.alloy-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:10px;margin-top:18px;}
.alloy-card{background:var(--deep);border:1px solid var(--border);border-top:2px solid var(--mercury);border-radius:3px;padding:18px;transition:background 0.2s;}
.alloy-card:hover{background:var(--mercury-glow);}
.alloy-card h3{font-size:0.82rem;font-weight:700;color:var(--white);text-transform:uppercase;letter-spacing:0.5px;margin-bottom:6px;}
.alloy-card p{font-size:0.8rem;margin:0;line-height:1.55;}

/* ── Toxicity warning ── */
.tox-box{background:linear-gradient(135deg,var(--deep),var(--silver-void));border:1px solid rgba(255,100,100,0.25);border-left:3px solid rgba(255,80,80,0.5);border-radius:4px;padding:24px 26px;margin-top:18px;}
.tox-box h3{font-size:0.82rem;font-weight:700;color:rgba(255,120,100,0.8);text-transform:uppercase;letter-spacing:1px;margin-bottom:10px;}
.tox-box p{margin:0 0 10px;} .tox-box p:last-child{margin:0;}

/* ── Uses ── */
.uses-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:10px;margin-top:18px;}
.use-card{background:var(--deep);border:1px solid var(--border);border-left:2px solid var(--mercury);padding:16px;transition:border-left-color 0.2s;}
.use-card:hover{border-left-color:var(--mercury-bright);}
.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;}

.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:'Syne Mono',monospace;font-size:0.5rem;letter-spacing:2px;color:var(--text-dim);text-transform:uppercase;}
@media(max-width:640px){.hero{grid-template-columns:1fr;} .droplet-wrap{margin:0 auto;}}