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

:root {
  --void: #020810;
  --deep: #040c18;
  --surface: #071428;
  --sky: #0a3a6e;
  --azure: #1060c0;
  --cyan: #00c8e8;
  --cyan-dim: rgba(0,200,232,0.1);
  --cyan-border: rgba(0,200,232,0.2);
  --air: #80d8f0;
  --pale: #d0f0ff;
  --white: #f0f8ff;
  --text: #3a7090;
  --text-bright: #90c8e0;
  --text-dim: #102030;
  --border: rgba(0,200,232,0.18);
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0;}
body{font-family:'Space Grotesk',sans-serif;background:var(--void);color:var(--text);min-height:100vh;overflow-x:hidden;}
#az-canvas{position:fixed;inset:0;z-index:0;pointer-events:none;}
body::before{content:'N';position:fixed;top:50%;left:50%;transform:translate(-50%,-50%);font-family:'JetBrains Mono',monospace;font-size:40vw;font-weight:500;opacity:0.025;z-index:1;pointer-events:none;color:var(--cyan);}
.wrap{position:relative;z-index:2;max-width:1020px;margin:0 auto;padding:0 28px 90px;}

/* ── HERO ── */
.hero{padding:64px 0 50px;display:grid;grid-template-columns:1fr 260px;gap:40px;align-items:center;border-bottom:1px solid var(--border);margin-bottom:56px;}
.hero-tag{font-family:'JetBrains Mono',monospace;font-size:0.58rem;letter-spacing:4px;text-transform:uppercase;color:var(--cyan);opacity:0.6;margin-bottom:14px;}
.hero h1{font-size:clamp(4rem,12vw,8rem);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(--text-dim);margin-top:12px;font-family:'JetBrains Mono',monospace;}
.hero-desc{font-size:0.96rem;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(--sky),var(--deep));border:2px solid var(--cyan-border);border-radius:12px;padding:20px;display:flex;flex-direction:column;justify-content:space-between;position:relative;overflow:hidden;box-shadow:0 0 40px rgba(0,200,232,0.1);}
.periodic-card::before{content:'';position:absolute;inset:0;background:radial-gradient(ellipse at 30% 30%,rgba(0,200,232,0.12),transparent 60%);}
.pc-num{font-family:'JetBrains Mono',monospace;font-size:0.9rem;color:var(--cyan);opacity:0.7;font-weight:500;}
.pc-symbol{font-family:'JetBrains Mono',monospace;font-size:5.5rem;font-weight:500;color:var(--white);line-height:1;text-align:center;text-shadow:0 0 30px rgba(0,200,232,0.3);}
.pc-name{font-size:0.85rem;font-weight:600;color:var(--air);text-align:center;letter-spacing:2px;text-transform:uppercase;}
.pc-mass{font-family:'JetBrains Mono',monospace;font-size:0.75rem;color:var(--cyan);opacity:0.6;text-align:right;}

/* ── Stats ── */
.props-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));border:1px solid var(--border);border-radius:3px;overflow:hidden;margin-bottom:56px;}
.prop{padding:18px 14px;background:var(--deep);border-right:1px solid var(--border);transition:background 0.2s;}
.prop:last-child{border-right:none;} .prop:hover{background:var(--cyan-dim);}
.p-label{font-family:'JetBrains Mono',monospace;font-size:0.52rem;letter-spacing:3px;text-transform:uppercase;color:var(--cyan);opacity:0.55;margin-bottom:7px;}
.p-value{font-size:1.1rem;font-weight:700;color:var(--pale);line-height:1.1;}
.p-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:'JetBrains Mono',monospace;font-size:0.55rem;letter-spacing:3px;color:var(--cyan);opacity:0.4;}
.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;}

/* ── Forms of nitrogen ── */
.forms-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:12px;margin-top:18px;}
.form-card{background:var(--deep);border:1px solid var(--border);border-top:2px solid var(--cyan);border-radius:4px;padding:20px;transition:transform 0.2s;}
.form-card:hover{transform:translateY(-3px);}
.form-icon{font-size:1.5rem;margin-bottom:8px;}
.form-card h3{font-family:'JetBrains Mono',monospace;font-size:0.82rem;color:var(--pale);margin-bottom:6px;font-weight:500;}
.form-card p{font-size:0.8rem;margin:0;line-height:1.55;}

/* ── Nitrogen cycle canvas ── */
.cycle-wrap{background:var(--deep);border:1px solid var(--border);border-radius:6px;padding:20px;margin-top:20px;text-align:center;}
#cycle-canvas{display:block;margin:0 auto 10px;}
.cycle-cap{font-family:'JetBrains Mono',monospace;font-size:0.6rem;color:rgba(0,200,232,0.3);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(--deep);border:1px solid var(--border);padding:16px;border-left:2px solid var(--cyan);transition:background 0.2s;}
.use-card:hover{background:var(--cyan-dim);}
.use-card h3{font-size:0.8rem;font-weight:700;color:var(--air);text-transform:uppercase;letter-spacing:0.5px;margin-bottom:6px;}
.use-card p{font-size:0.78rem;margin:0;line-height:1.5;}

/* ── Discovery ── */
.discovery-box{background:linear-gradient(135deg,var(--deep),var(--surface));border:1px solid rgba(0,200,232,0.25);border-left:3px solid var(--cyan);border-radius:6px;padding:24px 26px;margin-top:18px;}
.discovery-box h3{font-family:'JetBrains Mono',monospace;font-size:0.82rem;color:var(--air);margin-bottom:10px;}
.discovery-box p{margin:0 0 10px;} .discovery-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:'JetBrains Mono',monospace;font-size:0.52rem;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;}}