@import url('https://fonts.googleapis.com/css2?family=Nunito:wght@200;300;400;600;700;800&family=Source+Code+Pro:wght@300;400;500&display=swap');

:root {
  --ocean: #010c18;
  --deep-sea: #020f20;
  --sea: #041830;
  --surface: #062040;
  --wave: #0860b0;
  --azure: #1890d0;
  --aqua: #00c8e8;
  --aqua-dim: rgba(0,200,232,0.08);
  --aqua-border: rgba(0,200,232,0.18);
  --foam: #b0e8f8;
  --white: #f0faff;
  --ice: #d0f0ff;
  --text: #3a7898;
  --text-bright: #90cce0;
  --text-dim: #0c2030;
  --border: rgba(0,180,220,0.18);
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0;}
body{font-family:'Nunito',sans-serif;background:var(--ocean);color:var(--text);min-height:100vh;overflow-x:hidden;}
#eau-canvas{position:fixed;inset:0;z-index:0;pointer-events:none;}
body::before{content:'H₂O';position:fixed;bottom:-5%;right:-5%;font-size:25vw;font-weight:800;opacity:0.02;z-index:1;pointer-events:none;color:var(--aqua);font-family:'Nunito',sans-serif;}
.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:1fr 280px;gap:44px;align-items:center;border-bottom:1px solid var(--border);margin-bottom:58px;}
.hero-tag{font-size:0.6rem;font-weight:600;letter-spacing:5px;text-transform:uppercase;color:var(--aqua);opacity:0.6;margin-bottom:14px;}
.hero h1{font-size:clamp(4rem,11vw,8rem);font-weight:800;line-height:0.88;color:var(--white);letter-spacing:-2px;}
.hero h1 em{display:block;font-size:0.22em;font-style:normal;font-weight:300;letter-spacing:6px;color:var(--text-dim);margin-top:12px;font-family:'Source Code Pro',monospace;}
.hero-desc{font-size:0.96rem;line-height:1.88;color:var(--text);font-weight:300;margin-top:18px;}

/* ── Molecule visual ── */
.molecule-wrap{position:relative;width:260px;height:260px;display:flex;align-items:center;justify-content:center;}
#mol-canvas{display:block;}

/* ── Stats ── */
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(148px,1fr));border:1px solid var(--border);border-radius:3px;overflow:hidden;margin-bottom:58px;}
.stat{padding:18px 14px;background:var(--deep-sea);border-right:1px solid var(--border);transition:background 0.2s;}
.stat:last-child{border-right:none;} .stat:hover{background:var(--aqua-dim);}
.s-label{font-family:'Source Code Pro',monospace;font-size:0.52rem;letter-spacing:2px;text-transform:uppercase;color:var(--aqua);opacity:0.55;margin-bottom:7px;}
.s-value{font-size:1.05rem;font-weight:700;color:var(--ice);line-height:1.1;}
.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);}
.sn{font-family:'Source Code Pro',monospace;font-size:0.55rem;letter-spacing:3px;color:var(--aqua);opacity:0.4;}
.section h2{font-size:1.5rem;font-weight:800;color:var(--white);letter-spacing:-0.5px;}
p{font-size:0.96rem;line-height:1.87;color:var(--text);font-weight:300;margin-bottom:14px;}
strong{color:var(--text-bright);font-weight:700;}

/* ── States of water ── */
.states-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:18px;}
.state-card{background:var(--deep-sea);border:1px solid var(--border);border-radius:6px;padding:20px;text-align:center;transition:transform 0.2s,box-shadow 0.2s;}
.state-card:hover{transform:translateY(-3px);box-shadow:0 8px 24px rgba(0,180,220,0.1);}
.state-icon{font-size:2rem;margin-bottom:8px;}
.state-name{font-size:0.85rem;font-weight:700;color:var(--ice);text-transform:uppercase;letter-spacing:1px;margin-bottom:4px;}
.state-temp{font-family:'Source Code Pro',monospace;font-size:0.7rem;color:var(--aqua);margin-bottom:8px;}
.state-card p{font-size:0.78rem;margin:0;line-height:1.55;}

/* ── Anomalies ── */
.ano-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:12px;margin-top:18px;}
.ano-card{background:var(--deep-sea);border:1px solid var(--border);border-top:2px solid var(--aqua);border-radius:3px;padding:18px;transition:background 0.2s;}
.ano-card:hover{background:var(--aqua-dim);}
.ano-card h3{font-size:0.82rem;font-weight:700;color:var(--foam);margin-bottom:6px;}
.ano-card p{font-size:0.8rem;margin:0;line-height:1.55;}

/* ── Phase diagram canvas ── */
.phase-wrap{background:var(--deep-sea);border:1px solid var(--border);border-radius:6px;padding:20px;margin-top:18px;text-align:center;}
#phase-canvas{display:block;margin:0 auto 10px;}
.phase-cap{font-family:'Source Code Pro',monospace;font-size:0.58rem;color:rgba(0,200,232,0.3);letter-spacing:2px;text-transform:uppercase;}

/* ── Hydrogen bonding callout ── */
.hbond-box{background:linear-gradient(135deg,var(--deep-sea),var(--sea));border:1px solid rgba(0,200,232,0.25);border-left:3px solid var(--aqua);border-radius:6px;padding:24px 26px;margin-top:18px;}
.hbond-box h3{font-size:0.9rem;font-weight:700;color:var(--ice);margin-bottom:12px;}
.hbond-box p{margin:0 0 12px;} .hbond-box p:last-child{margin:0;}

/* ── Water uses ── */
.uses-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:10px;margin-top:18px;}
.use-card{background:var(--deep-sea);border:1px solid var(--border);border-left:2px solid var(--azure);padding:16px;transition:border-left-color 0.2s,background 0.2s;}
.use-card:hover{background:var(--aqua-dim);border-left-color:var(--aqua);}
.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:'Source Code Pro',monospace;font-size:0.52rem;letter-spacing:2px;color:var(--text-dim);text-transform:uppercase;}
@media(max-width:640px){.hero{grid-template-columns:1fr;} .molecule-wrap{margin:0 auto;} .states-grid{grid-template-columns:1fr;}}