@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;600;700&family=Outfit:wght@300;400;500;600;700&display=swap');
:root {
  --bg:#0a0e1a;--bg2:#111827;--bg3:#1a2235;--surface:#1e293b;--border:#2d3a4f;
  --text:#e2e8f0;--muted:#9badc4;--dim:#6b7f96;
  --cyan:#22d3ee;--cyan-dim:rgba(34,211,238,.12);
  --green:#34d399;--green-dim:rgba(52,211,153,.12);
  --amber:#fbbf24;--amber-dim:rgba(251,191,36,.12);
  --red:#f87171;--red-dim:rgba(248,113,113,.12);
  --pink:#f472b6;--purple:#a78bfa;
  --radius:12px;--radius-sm:8px;
}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:'Outfit',sans-serif;background:var(--bg);color:var(--text);min-height:100dvh;-webkit-font-smoothing:antialiased}
.mono{font-family:'JetBrains Mono',monospace}
a{color:inherit;text-decoration:none}

/* ── Buttons ── */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:14px 28px;border-radius:var(--radius);border:none;font-family:'Outfit',sans-serif;font-size:15px;font-weight:600;cursor:pointer;transition:transform .1s,opacity .2s;color:var(--bg);width:100%;max-width:340px}
.btn:active{transform:scale(.97)}.btn:disabled{opacity:.35;cursor:not-allowed}
.btn-cyan{background:var(--cyan)}.btn-green{background:var(--green)}.btn-amber{background:var(--amber)}.btn-red{background:var(--red)}.btn-purple{background:var(--purple)}
.btn-outline{background:0;border:1.5px solid var(--border);color:var(--muted)}.btn-outline:hover{border-color:var(--muted);color:var(--text)}
.btn-sm{padding:10px 20px;font-size:13px;max-width:none;width:auto}

/* ── Paint blobs ── */
.blob{width:72px;height:72px;border-radius:50%;border:3px solid rgba(255,255,255,.15);display:inline-flex;align-items:center;justify-content:center;font-size:12px;font-weight:600;color:#fff;text-shadow:0 1px 3px rgba(0,0,0,.4);transition:transform .3s,box-shadow .3s;flex-shrink:0}
.blob.sm{width:44px;height:44px;font-size:10px}.blob.lg{width:96px;height:96px;font-size:14px}.blob.xl{width:120px;height:120px;font-size:16px}
.blob.glow{box-shadow:0 0 24px rgba(255,255,255,.2)}

/* ── Color palette ── */
.palette{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;max-width:320px;margin:0 auto}
.swatch{aspect-ratio:1;border-radius:var(--radius);border:3px solid transparent;cursor:pointer;transition:transform .15s,border-color .2s,box-shadow .2s;position:relative}
.swatch:active{transform:scale(.92)}
.swatch.sel{border-color:#fff;box-shadow:0 0 20px rgba(255,255,255,.25);transform:scale(1.05)}
.swatch.sel::after{content:'✓';position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font-size:22px;font-weight:700;color:#fff;text-shadow:0 1px 4px rgba(0,0,0,.5)}

/* ── Cards & panels ── */
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:20px}
.glass{background:rgba(30,41,59,.7);backdrop-filter:blur(8px);border:1px solid var(--border);border-radius:var(--radius);padding:16px}

/* ── Equations ── */
.eq{display:flex;align-items:center;justify-content:center;gap:12px;flex-wrap:wrap}
.eq .op{font-size:22px;font-weight:300;color:var(--muted)}

/* ── Tags ── */
.tag{display:inline-block;padding:4px 14px;border-radius:100px;font-size:11px;font-weight:600;letter-spacing:.5px;text-transform:uppercase}

/* ── Animations ── */
.fade-in{animation:fadeIn .4s ease both}
@keyframes fadeIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.5}}
.waiting{animation:pulse 1.5s ease-in-out infinite}
@keyframes slideInRight{from{opacity:0;transform:translateX(40px)}to{opacity:1;transform:translateX(0)}}
@keyframes slideInLeft{from{opacity:0;transform:translateX(-40px)}to{opacity:1;transform:translateX(0)}}
@keyframes scaleIn{from{opacity:0;transform:scale(.7)}to{opacity:1;transform:scale(1)}}
@keyframes hammerHit{0%{transform:rotate(0)}40%{transform:rotate(-35deg)}55%{transform:rotate(8deg)}70%{transform:rotate(-15deg)}85%{transform:rotate(4deg)}100%{transform:rotate(0)}}
@keyframes spark{0%{opacity:1;transform:scale(1)}100%{opacity:0;transform:scale(0) translateY(-20px)}}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-6px)}}
@keyframes successPulse{0%,100%{box-shadow:0 0 20px rgba(52,211,153,.3)}50%{box-shadow:0 0 50px rgba(52,211,153,.6)}}
.reveal-glow{animation:successPulse 2s ease-in-out infinite;border-color:var(--green)!important}

/* ── Unknown blob ── */
.unknown{background:repeating-conic-gradient(var(--bg3) 0% 25%,var(--surface) 0% 50%) 50%/16px 16px;color:var(--muted);font-size:24px}

/* ── Presenter nav ── */
.nav{display:flex;gap:6px;flex-wrap:wrap;padding:12px 24px;background:var(--bg2);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:100}
.nav-btn{padding:8px 16px;border-radius:var(--radius-sm);border:1px solid var(--border);background:0;color:var(--muted);font-family:'Outfit',sans-serif;font-size:12px;font-weight:600;cursor:pointer;transition:all .15s;white-space:nowrap}
.nav-btn:hover{border-color:var(--muted);color:var(--text)}
.nav-btn.active{background:var(--cyan-dim);border-color:var(--cyan);color:var(--cyan)}
.nav-btn.home{border-color:var(--amber);color:var(--amber)}

/* ── Presenter slide area ── */
.slide-area{padding:32px;min-height:calc(100dvh - 60px)}
.slide-title{font-size:32px;font-weight:700;margin:0 0 6px}
.slide-sub{font-size:14px;color:var(--muted);margin:0 0 32px;letter-spacing:.5px;text-transform:uppercase;font-weight:600}

/* ── Three-column demo layout ── */
.demo-cols{display:grid;grid-template-columns:1fr 1.1fr 1fr;gap:20px;min-height:calc(100dvh - 200px)}
.demo-col{background:var(--bg2);border:1px solid var(--border);border-radius:16px;padding:24px;display:flex;flex-direction:column;align-items:center;position:relative;overflow:hidden}
.demo-col::before{content:'';position:absolute;top:0;left:0;right:0;height:3px}
.demo-col.col-a::before{background:var(--cyan)}.demo-col.col-m::before{background:var(--amber)}.demo-col.col-b::before{background:var(--green)}
.col-head{font-size:16px;font-weight:700;margin:0 0 4px}.col-sub{font-size:11px;color:var(--muted);text-transform:uppercase;letter-spacing:1px;font-weight:600;margin:0 0 16px}
.col-body{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px;width:100%;text-align:center}

/* ── Hexagon (Parkerian) ── */
.hex-grid{position:relative;width:560px;height:480px;margin:20px auto}
.hex{position:absolute;width:160px;height:175px;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:28px 16px;transition:transform .3s}
.hex:hover{transform:scale(1.06)}
.hex-bg{position:absolute;inset:0}
.hex-bg svg{width:100%;height:100%}
.hex-icon{font-size:26px;margin:0 0 6px;position:relative;z-index:1}.hex-name{font-size:14px;font-weight:700;margin:0 0 3px;position:relative;z-index:1}.hex-desc{font-size:10px;opacity:.8;line-height:1.3;position:relative;z-index:1}

/* ── Info grid ── */
.info-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px;width:100%;max-width:900px;margin:0 auto}
.info-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:20px 24px;transition:transform .2s}
.info-card:hover{transform:translateY(-2px)}
.info-card h3{font-size:16px;font-weight:600;margin:0 0 8px}.info-card p{font-size:13px;color:var(--muted);line-height:1.6}

/* ── Comparison table ── */
.cmp-table{width:100%;border-collapse:collapse;font-size:13px;max-width:1000px;margin:0 auto}
.cmp-table th{padding:10px 12px;text-align:left;color:var(--cyan);font-weight:600;border-bottom:2px solid var(--border);font-size:12px;text-transform:uppercase;letter-spacing:.5px}
.cmp-table td{padding:10px 12px;border-bottom:1px solid var(--border)}
.cmp-table tr:hover td{background:rgba(255,255,255,.02)}

/* ── Flow diagrams (E2E vs Server) ── */
.flow{display:flex;align-items:center;justify-content:center;gap:12px;padding:20px;border-radius:var(--radius);margin:8px 0;flex-wrap:wrap}
.flow-node{padding:10px 18px;border-radius:var(--radius-sm);font-size:13px;font-weight:600;text-align:center}
.flow-arrow{font-size:18px;color:var(--muted)}

/* ── Player (mobile) ── */
.player{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:100dvh;padding:24px 20px;text-align:center}
.player-wrap{width:100%;max-width:400px}
.player h1{font-size:26px;font-weight:700;margin:0 0 4px}
.player .role-tag{display:inline-block;padding:4px 16px;border-radius:100px;font-size:12px;font-weight:600;margin:0 0 20px;letter-spacing:1px}
.player .subtitle{color:var(--muted);font-size:14px;margin:0 0 20px;line-height:1.5}
.player .subtitle strong{color:var(--text)}
.player textarea{width:100%;max-width:320px;padding:14px;border-radius:var(--radius);border:1px solid var(--border);background:var(--bg2);color:var(--text);font-family:'Outfit',sans-serif;font-size:15px;resize:none;min-height:80px}
.player textarea:focus{outline:none;border-color:var(--cyan)}
.player .cipher-display{background:var(--bg2);border:1px solid var(--border);border-radius:var(--radius);padding:14px;max-width:320px;width:100%;margin:0 auto;font-size:12px;word-break:break-all;line-height:1.6}
.player .msg-display{background:var(--bg2);border:1px solid var(--green);border-radius:var(--radius);padding:14px;max-width:320px;width:100%;margin:0 auto;font-size:15px;line-height:1.5;color:var(--green)}
.player .status{display:flex;align-items:center;gap:8px;justify-content:center;padding:10px 16px;border-radius:var(--radius-sm);background:var(--bg2);border:1px solid var(--border);font-size:12px;color:var(--muted);margin:8px 0}
.player .status .dot{width:16px;height:16px;border-radius:50%;border:2px solid rgba(255,255,255,.2);flex-shrink:0}

/* ── Forge animation ── */
.forge-scene{position:relative;width:200px;height:160px;margin:16px auto}
.anvil{position:absolute;bottom:0;left:50%;transform:translateX(-50%);width:120px;height:40px;background:var(--dim);border-radius:4px 4px 8px 8px}
.hammer{position:absolute;top:10px;left:50%;transform-origin:bottom center;font-size:48px;transform:translateX(-50%)}
.hammer.striking{animation:hammerHit .5s ease 3}
.sparks{position:absolute;top:60px;left:50%;transform:translateX(-50%);display:flex;gap:4px}
.spark{width:6px;height:6px;border-radius:50%;background:var(--amber);opacity:0}
.sparks.active .spark{animation:spark .4s ease forwards}
.sparks.active .spark:nth-child(2){animation-delay:.1s}.sparks.active .spark:nth-child(3){animation-delay:.15s}.sparks.active .spark:nth-child(4){animation-delay:.2s}

/* ── Padlock & key display ── */
.key-pair{display:flex;align-items:center;justify-content:center;gap:24px;margin:12px 0}
.key-item{display:flex;flex-direction:column;align-items:center;gap:6px}
.key-item .icon{font-size:40px;animation:float 3s ease-in-out infinite}.key-item .label{font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:.5px}

/* ── Box visual ── */
.box-visual{width:100px;height:80px;border-radius:var(--radius-sm);border:3px solid var(--border);display:flex;align-items:center;justify-content:center;font-size:28px;background:var(--surface);position:relative;margin:8px auto}
.box-visual.locked{border-color:var(--cyan)}
.box-visual .lock-icon{position:absolute;top:-14px;right:-10px;font-size:20px}

/* ── Watch screen ── */
.watch{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px;opacity:.6}
.watch-icon{font-size:40px}
.watch-text{font-size:14px;color:var(--muted)}