:root{color:#e8f7ff;--panel:#081824c2;--panel-border:#75d4ff29;--soft:#dcf1ffc2;--faint:#dcf1ff8f;--network:#7cffb2;--host:#65c6ff;--danger:#ff7b8d;--shadow:0 24px 60px #00000052;font-synthesis:none;text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background:radial-gradient(circle at 12% 10%,#00e0ff2e,#0000 24%),radial-gradient(circle at 88% 18%,#7cffb224,#0000 20%),linear-gradient(#05111a 0%,#0a1d2b 44%,#071019 100%);font-family:Space Grotesk,Segoe UI,sans-serif}*{box-sizing:border-box}body{min-width:320px;min-height:100vh;margin:0}button,input{font:inherit}button{cursor:pointer}#app{min-height:100vh}.shell{width:min(1280px,100% - 28px);margin:0 auto;padding:24px 0 36px}.panel{border:1px solid var(--panel-border);background:var(--panel);-webkit-backdrop-filter:blur(18px);box-shadow:var(--shadow);border-radius:28px}.hero{grid-template-columns:minmax(0,1.1fr) minmax(260px,.8fr);gap:18px;padding:28px;display:grid}.eyebrow{text-transform:uppercase;letter-spacing:.22em;color:var(--network);margin:0 0 12px;font-size:12px;font-weight:700}.hero h1{letter-spacing:-.05em;margin:0;font-size:clamp(2.6rem,5vw,4.6rem);line-height:.96}.hero-text{max-width:54ch;color:var(--soft);margin:16px 0 0;font-size:1.04rem;line-height:1.65}.hero-status{gap:12px;display:grid}.status-card,.fact-card,.challenge-card{background:#ffffff0a;border:1px solid #ffffff14;border-radius:22px;padding:16px 18px}.status-card span,.fact-card span,.challenge-card span,.score-row span{color:var(--faint);text-transform:uppercase;letter-spacing:.14em;font-size:.78rem;display:block}.status-card strong,.fact-card strong,.challenge-card strong,.score-row strong{margin-top:8px;font-size:1.2rem;display:block}.layout{grid-template-columns:minmax(0,1.35fr) minmax(300px,.8fr);gap:20px;margin-top:20px;display:grid}.stack{gap:20px;display:grid}.playground,.dashboard,.challenge-panel{padding:22px}.section-head{justify-content:space-between;align-items:center;gap:14px;margin-bottom:18px;display:flex}.section-head.compact{margin-bottom:14px}.section-head h2,.visual-head h3{margin:4px 0 0;font-size:1.45rem}.ghost-button{color:#effbff;background:#ffffff0a;border:1px solid #ffffff1f;border-radius:999px;padding:11px 16px}.control-grid{grid-template-columns:1.1fr 1fr 1fr;gap:14px;display:grid}.field{gap:8px;display:grid}.field span{color:var(--soft);font-size:.88rem}.field input{color:#f4feff;background:#ffffff0a;border:1px solid #ffffff1a;border-radius:18px;outline:none;width:100%;padding:14px 16px}.range-wrap{grid-template-columns:1fr auto;align-items:center;gap:10px;display:grid}input[type=range]{accent-color:var(--network)}.range-value{text-align:center;min-width:60px;color:var(--network);background:#7cffb21f;border-radius:999px;padding:10px 14px;font-weight:700}.message,.challenge-feedback{color:var(--soft);background:#ffffff0a;border-radius:16px;margin-top:14px;padding:12px 14px}.message[data-state=error],.challenge-feedback[data-state=error]{color:#ffd8de;background:#ff7b8d24}.challenge-feedback[data-state=success]{color:#d9ffe6;background:#7cffb224}.visual-block{background:#ffffff08;border:1px solid #ffffff0f;border-radius:24px;margin-top:18px;padding:18px}.visual-head{justify-content:space-between;align-items:flex-start;gap:16px;margin-bottom:14px;display:flex}.visual-mini,.legend span{color:var(--faint);font-size:.86rem}.legend{flex-wrap:wrap;gap:12px;display:flex}.swatch{border-radius:999px;width:10px;height:10px;margin-right:6px;display:inline-block}.swatch.network{background:var(--network)}.swatch.host{background:var(--host)}.bit-grid{grid-template-columns:repeat(8,minmax(0,1fr));gap:10px;display:grid}.bit-cell{text-align:center;border:1px solid #ffffff12;border-radius:18px;padding:12px 8px}.bit-cell.network{background:linear-gradient(#7cffb238,#7cffb214)}.bit-cell.host{background:linear-gradient(#65c6ff33,#65c6ff0f)}.bit-top,.bit-cell small{color:var(--faint);font-size:.74rem;display:block}.bit-cell strong{margin:6px 0;font-size:1.2rem;display:block}.octet-scale{gap:10px;display:grid}.octet-track,.challenge-track{background:#ffffff0a;border-radius:18px;align-items:stretch;min-height:88px;display:flex;overflow:hidden}.segment,.challenge-segment{color:#ecfbff;background:#65c6ff14;border:0;border-right:1px solid #ffffff14;flex-direction:column;justify-content:center;align-items:center;gap:6px;padding:8px 4px;display:flex}.segment.active{background:linear-gradient(#7cffb257,#7cffb21f);box-shadow:inset 0 0 0 1px #7cffb259}.segment span,.challenge-segment span{font-weight:700}.segment small,.challenge-segment small{color:var(--faint)}.octet-axis{height:20px;position:relative}.octet-axis span{color:var(--faint);font-size:.76rem;position:absolute;transform:translate(-50%)}.position-lane{gap:16px;display:grid}.position-track{background:#ffffff0a;border-radius:22px;height:92px;position:relative;overflow:hidden}.position-fill{background:linear-gradient(90deg,#7cffb22e,#65c6ff3d);border-radius:999px;position:absolute;inset:40px 18px}.pin{position:absolute;top:16px;transform:translate(-50%)}.pin span{color:#05111a;border-radius:999px;place-items:center;width:34px;height:34px;font-weight:700;display:grid}.pin:after{content:"";opacity:.6;background:currentColor;width:2px;height:28px;margin:4px auto 0;display:block}.pin.network{color:var(--network)}.pin.network span{background:var(--network)}.pin.first{color:#9cf4c1}.pin.first span{background:#9cf4c1}.pin.host{color:var(--host)}.pin.host span{background:var(--host)}.pin.last{color:#87d7ff}.pin.last span{background:#87d7ff}.pin.broadcast{color:#ffd166}.pin.broadcast span{background:#ffd166}.pin-labels{grid-template-columns:repeat(5,minmax(0,1fr));gap:10px;display:grid}.pin-labels div{color:var(--soft);word-break:break-word;font-size:.78rem}.fact-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;display:grid}.challenge-card p{color:var(--soft);margin:8px 0 0}.challenge-segment{cursor:pointer;transition:background .16s}.challenge-segment:hover{background:#65c6ff29}.challenge-segment.correct{background:linear-gradient(#7cffb261,#7cffb224)}.challenge-segment.wrong{background:linear-gradient(#ff7b8d57,#ff7b8d1f)}.score-row{background:#ffffff0a;border-radius:18px;justify-content:space-between;align-items:center;margin-top:14px;padding:14px 16px;display:flex}@media (width<=1080px){.hero,.layout{grid-template-columns:1fr}}@media (width<=760px){.shell{width:min(100% - 18px,1280px);padding-top:16px;padding-bottom:24px}.hero,.playground,.dashboard,.challenge-panel{padding:18px}.control-grid,.fact-grid,.pin-labels,.bit-grid{grid-template-columns:1fr}.section-head,.visual-head,.score-row{flex-direction:column;align-items:stretch}.octet-track,.challenge-track{min-height:120px}}