/* Trivia & Tunes case study — Blue Note Jazz Noir chrome, T&T accent inside content */
:root{
  --bg:#0A1020; --bg-deep:#060A13; --bg-mid:#161B35;
  --panel:rgba(8,13,24,0.78); --panel-2:rgba(11,16,29,0.6);
  --line:rgba(255,255,255,0.10); --line-strong:rgba(255,255,255,0.22);
  --ink:#F4F8FF; --muted:rgba(231,237,245,0.74); --faint:rgba(231,237,245,0.55);
  --gold:#C9A84C; --gold-bright:#E1BF69;
  --cyan:#72E6FF; --pink:#FF7BB8; --purple:#7365FF;
  --serif:'Spectral',Georgia,'Times New Roman',serif;
  --sans:'Manrope','Segoe UI',system-ui,sans-serif;
  --mono:'JetBrains Mono','Cascadia Code',Consolas,monospace;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
html{min-height:100%;background:#0A1020}
body{
  margin:0; color:var(--ink); line-height:1.7;
  font-family:var(--sans);
  min-height:100vh;
  background:linear-gradient(165deg,#0A1020 0%,#161B35 50%,#060A13 100%) no-repeat;
}
a{color:var(--cyan);text-underline-offset:3px}
a:hover{color:#A9EEFF}
img,svg{max-width:100%;height:auto}

/* chrome */
.site-header{
  position:sticky;top:0;z-index:10;backdrop-filter:blur(10px);
  background:rgba(6,10,19,0.7);border-bottom:1px solid var(--line);
}
.nav{max-width:1080px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;
     gap:20px;padding:14px 20px}
.brand{font-family:var(--mono);font-size:12px;letter-spacing:.22em;text-transform:uppercase;color:var(--gold)}
.brand b{color:var(--ink);font-weight:600}
.nav-links{display:flex;flex-wrap:wrap;gap:18px;font-size:14px}
.nav-links a{color:var(--muted);text-decoration:none}
.nav-links a:hover,.nav-links a.active{color:var(--ink)}

.wrap{max-width:1080px;margin:0 auto;padding:0 20px}
.prose{max-width:760px}

/* hero */
.hero{padding:64px 0 30px;border-bottom:1px solid var(--line)}
.eyebrow{font-family:var(--mono);font-size:13px;letter-spacing:.28em;text-transform:uppercase;
         color:var(--gold);margin:0 0 14px}
.eyebrow.cyan{color:var(--cyan)} .eyebrow.pink{color:var(--pink)}
h1{font-family:var(--serif);font-weight:600;font-size:clamp(36px,6vw,68px);line-height:1.08;margin:0}
h2{font-family:var(--serif);font-weight:600;font-size:clamp(26px,3.4vw,38px);margin:54px 0 14px;line-height:1.18}
h3{font-size:21px;margin:34px 0 10px;color:var(--gold-bright)}
.dek{font-size:21px;color:var(--muted);max-width:720px;margin:20px 0 0}
.content p,.content li{font-size:18px}
.content p{margin:0 0 18px}
.content ul,.content ol{padding-left:22px}
.content li{margin:0 0 10px}
.lead{font-size:22px;color:var(--ink)}

/* meta row */
.meta-row{display:flex;flex-wrap:wrap;gap:10px;margin:26px 0 0}
.chip{font-family:var(--mono);font-size:12px;letter-spacing:.05em;color:var(--muted);
      border:1px solid var(--line);border-radius:999px;padding:7px 14px;background:var(--panel-2)}
.chip b{color:var(--ink)}

/* hero image */
.hero-figure{margin:34px 0 0;border:1px solid var(--line);border-radius:16px;overflow:hidden;
             background:var(--bg-deep)}
.hero-figure img{display:block;width:100%}

/* cards / grid */
.grid{display:grid;gap:18px;margin:30px 0}
.grid.two{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid.three{grid-template-columns:repeat(3,minmax(0,1fr))}
.card{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:22px;
      text-decoration:none;color:inherit;display:block;transition:border-color .15s,transform .15s}
a.card:hover{border-color:var(--line-strong);transform:translateY(-2px)}
.card .kicker{font-family:var(--mono);font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:var(--cyan)}
.card h3{margin:12px 0 8px;color:var(--ink)}
.card p{margin:0;color:var(--muted);font-size:16px}

/* stat strip */
.stats{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px;margin:30px 0}
.stat{background:var(--panel-2);border:1px solid var(--line);border-radius:14px;padding:20px}
.stat .num{font-family:var(--serif);font-size:34px;color:var(--gold-bright);line-height:1.1}
.stat .lbl{color:var(--muted);font-size:14px;margin-top:6px}

/* callout */
.note{border-left:3px solid var(--gold);background:var(--panel-2);border-radius:0 12px 12px 0;
      padding:18px 20px;margin:26px 0}
.note p{margin:0;color:var(--muted)}
.note.cyan{border-left-color:var(--cyan)} .note.pink{border-left-color:var(--pink)}

/* code */
code{font-family:var(--mono)}
p code,li code{background:rgba(114,230,255,0.12);color:#BDEFFF;padding:2px 6px;border-radius:5px;font-size:.92em}
pre{background:#070b14;border:1px solid var(--line);border-radius:12px;padding:18px;overflow-x:auto;
    font-family:var(--mono);font-size:14px;line-height:1.55;color:#D8E6F5}

/* mermaid embed */
.diagram{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:20px;margin:26px 0;overflow-x:auto}
.diagram .mermaid{min-width:560px;text-align:center}
.diagram .cap{font-family:var(--mono);font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:var(--faint);margin:0 0 12px}

/* tt accent block */
.tt{display:inline-flex;align-items:center;gap:8px;font-family:var(--serif);font-weight:600}
.tt .amp{color:var(--gold)}
.pill-tt{display:inline-block;font-family:var(--mono);font-size:11px;letter-spacing:.18em;
         text-transform:uppercase;color:#0A1020;background:linear-gradient(90deg,#72E6FF,#FF7BB8);
         padding:5px 12px;border-radius:999px;font-weight:700}

/* cta */
.cta{display:inline-block;font-family:var(--sans);font-weight:700;text-decoration:none;
     padding:13px 24px;border-radius:999px;background:var(--gold);color:#0A1020;margin:6px 10px 6px 0}
.cta:hover{background:var(--gold-bright);color:#0A1020}
.cta.ghost{background:transparent;color:var(--ink);border:1px solid var(--line-strong)}
.cta.ghost:hover{border-color:var(--gold);color:var(--gold-bright)}

footer{border-top:1px solid var(--line);margin-top:60px;padding:30px 0 50px;color:var(--faint);font-size:14px}
footer .wrap{display:flex;flex-wrap:wrap;gap:16px;justify-content:space-between}

/* diagram lightbox */
#diagram-lightbox{
  display:none;position:fixed;inset:0;z-index:1000;
  background:rgba(0,0,0,0.88);backdrop-filter:blur(6px);
  align-items:center;justify-content:center;cursor:zoom-out;
}
#diagram-lightbox.lb-open{display:flex}
.lb-inner{
  background:#0A1020;border:1px solid rgba(255,255,255,0.18);
  border-radius:16px;padding:28px 28px 20px;max-width:96vw;max-height:93vh;
  overflow:auto;cursor:default;position:relative;
}
.lb-inner svg{width:auto;max-width:none;height:auto;display:block}
.lb-close{
  position:absolute;top:10px;right:14px;background:none;border:none;
  color:var(--muted);font-size:26px;line-height:1;cursor:pointer;padding:4px 8px;
}
.lb-close:hover{color:var(--ink)}
.diagram{cursor:zoom-in}
.diagram:hover{border-color:var(--line-strong)}

@media(max-width:820px){
  .grid.two,.grid.three{grid-template-columns:1fr}
  .stats{grid-template-columns:repeat(2,1fr)}
  .nav{flex-direction:column;align-items:flex-start}
}