:root{--paper: #faf8f3;--paper-pure: #ffffff;--paper-deep: #f2efe6;--ink: #12110f;--ink-soft: #3d3a34;--ink-mute: #7a746a;--line: #e4dfd2;--line-strong: #cfc8b6;--accent: #ffd700;--accent-deep: #e0b800;--accent-wash: rgba(255, 215, 0, .18);--grid: rgba(18, 17, 15, .05);--shadow-soft: 0 1px 2px rgba(18, 17, 15, .04), 0 8px 24px rgba(18, 17, 15, .06);--shadow-lift: 0 2px 4px rgba(18, 17, 15, .05), 0 18px 48px rgba(18, 17, 15, .1);--danger: #b3261e;--display: "Fraunces", "Georgia", serif;--sans: "Plus Jakarta Sans", system-ui, sans-serif;--mono: "IBM Plex Mono", ui-monospace, monospace;color-scheme:light}*{box-sizing:border-box}[hidden]{display:none!important}html,body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--sans);font-size:15px}h1,h2,p{margin:0}a{color:var(--ink)}button,input,select{font:inherit;color:inherit}.landing{position:relative;min-height:100vh}.blueprint:before{content:"";position:absolute;inset:0;pointer-events:none;z-index:0;background-image:linear-gradient(var(--grid) 1px,transparent 1px),linear-gradient(90deg,var(--grid) 1px,transparent 1px);background-size:34px 34px;mask-image:radial-gradient(ellipse 85% 70% at 50% 35%,#000 35%,transparent 100%);-webkit-mask-image:radial-gradient(ellipse 85% 70% at 50% 35%,#000 35%,transparent 100%)}.landing>*{position:relative;z-index:1}.display{font-family:var(--display);font-optical-sizing:auto;font-weight:600;letter-spacing:-.025em;line-height:.98;overflow-wrap:break-word}.kicker{font-family:var(--mono);font-size:clamp(.64rem,2.4vw,.72rem);font-weight:500;letter-spacing:.22em;text-transform:uppercase;color:var(--ink-mute)}.kicker.light{color:#f6f3ec9e}.mono{font-family:var(--mono)}.marker{background-image:linear-gradient(var(--accent-wash),var(--accent-wash));background-repeat:no-repeat;background-position:0 78%;background-size:100% .42em}.top{position:sticky;top:0;z-index:20;background:#faf8f3d1;backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}.top-inner{max-width:1240px;margin:0 auto;padding:0 24px;min-height:72px;display:flex;align-items:center;gap:20px}.brand{display:inline-flex;margin-right:auto}.logo{height:30px;display:block}.top-kicker{display:none}.hero{max-width:1240px;margin:0 auto;padding:56px 24px 28px}.hero h1{font-size:clamp(2rem,6vw,3.4rem);max-width:16ch;margin-top:12px}.lead{font-size:1.08rem;line-height:1.65;color:var(--ink-soft);max-width:62ch;margin-top:18px}.wrap{display:grid;grid-template-columns:360px 1fr;gap:20px;padding:12px 24px 40px;max-width:1240px;margin:0 auto}.card-paper{background:var(--paper-pure);border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow-soft);padding:22px}.form{display:flex;flex-direction:column;gap:16px;align-self:start}.form label{display:flex;flex-direction:column;gap:8px}.form label small,.form .hint{font-size:.8rem;color:var(--ink-mute);margin-top:-8px}.form input{padding:13px 14px;border:1px solid var(--line);border-radius:12px;font-size:1.15rem;font-family:var(--mono);background:var(--paper);color:var(--ink)}.form input:focus{outline:2px solid var(--accent);border-color:transparent}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;cursor:pointer;padding:11px 22px;border:1px solid transparent;background:transparent;text-decoration:none;font-weight:700;transition:background .2s,border-color .2s,transform .2s;text-transform:none}.btn.pill{border-radius:99px}.btn:disabled{opacity:.5;cursor:not-allowed}.btn.ink{background:var(--ink);color:var(--paper)}.btn.ink:hover:not(:disabled){background:#2a2723}.btn.accent{background:var(--accent);color:var(--ink);font-weight:800}.btn.accent:hover:not(:disabled){background:var(--accent-deep)}.btn.accent.big{padding:15px 28px;font-size:1rem;box-shadow:0 10px 30px #ffd70059}.btn.outline{border-color:var(--line-strong);color:var(--ink)}.btn.outline:hover:not(:disabled){background:#12110f0a;border-color:var(--ink)}.btn.outline.soft{color:var(--ink-soft);font-weight:600}.btn.small{padding:6px 12px;font-size:.82rem}.btn.full{grid-column:1 / -1}select.btn{appearance:auto}.actions{display:grid;grid-template-columns:1fr 1fr;gap:8px}.stats{font-size:.8rem;color:var(--ink-soft);line-height:1.7;padding:12px 14px;background:var(--paper-deep);border-radius:12px;border-top:2px solid var(--accent)}.stats strong{color:var(--ink);font-weight:600}.stats .ok{color:var(--ink);font-weight:600;background:var(--accent-wash);padding:1px 6px;border-radius:4px}.stats .err{color:var(--danger);font-weight:600}.preview-card{display:flex;flex-direction:column;gap:12px;min-height:560px}.preview-head{display:flex;align-items:center;gap:18px}.preview-head .check{display:inline-flex;align-items:center;gap:6px;cursor:pointer}.preview-head .check input{accent-color:var(--ink)}.preview-head .btn{margin-left:auto}.legend{display:inline-flex;align-items:center;gap:8px}.legend i{display:inline-block;width:22px;height:0;border-top:2px solid var(--ink)}.legend i.off{border-top:2px dashed var(--danger)}.preview{position:relative;flex:1;min-height:440px;background:var(--paper-pure);border:1px solid var(--line);border-radius:12px;overflow:hidden;background-image:linear-gradient(var(--grid) 1px,transparent 1px),linear-gradient(90deg,var(--grid) 1px,transparent 1px);background-size:34px 34px}.preview-svg{display:block;cursor:grab;touch-action:none}.preview-svg.panning{cursor:grabbing}.empty{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:16px;text-align:center;color:var(--ink-mute);pointer-events:none;padding:20px}.wave{font-size:clamp(1.6rem,4vw,2.4rem);letter-spacing:.06em;color:var(--ink);line-height:1.25}.note{font-size:.82rem;color:var(--ink-mute);line-height:1.55}.layer path,.highlight-path,.sim-done,.sim-partial{fill:none;vector-effect:non-scaling-stroke}.layer-original path{stroke:var(--line-strong);stroke-width:1;stroke-dasharray:3 3}.layer-flycut path{stroke:var(--ink);stroke-width:1.6}.layer-travel path{stroke:var(--danger);stroke-width:1;stroke-dasharray:5 4}.layer-arrows path{fill:var(--accent-deep);stroke:none}.layer-points .pt-start{fill:var(--accent-deep);stroke:none}.layer-points .pt-end{fill:var(--danger);stroke:none}.layer-numbers text{fill:var(--ink-mute);font-family:var(--mono);text-anchor:middle;dominant-baseline:middle}.simulating .layer-flycut path{opacity:.14}.simulating .layer-travel path{opacity:.25}.sim-done{stroke:var(--ink);stroke-width:2}.sim-partial.on{stroke:var(--accent-deep);stroke-width:2.8}.sim-partial.off{stroke:var(--danger);stroke-width:1.4;stroke-dasharray:5 4}.sim-head{stroke:var(--ink);stroke-width:1.5;vector-effect:non-scaling-stroke}.sim-head.on{fill:var(--accent)}.sim-head.off{fill:var(--danger)}.sim-halo{fill:#ffd7004d}.sim-bar{display:flex;align-items:center;gap:10px;padding:8px 10px;background:var(--paper-deep);border:1px solid var(--line);border-radius:99px}.sim-bar input[type=range]{flex:1;accent-color:var(--ink)}.laser{font-size:.66rem;font-weight:600;padding:5px 10px;border-radius:99px;letter-spacing:.14em;min-width:92px;text-align:center}.laser.on{background:var(--accent);color:var(--ink)}.laser.off{background:transparent;color:var(--danger);border:1px dashed var(--danger)}.readout{font-size:.72rem;color:var(--ink-mute);min-width:180px;text-align:right;font-variant-numeric:tabular-nums}.slab-dark{position:relative;background:#14130f;color:#f6f3ec;border-radius:20px;overflow:hidden}.slab-dark:after{content:"";position:absolute;inset:0;pointer-events:none;background-image:linear-gradient(rgba(255,255,255,.045) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.045) 1px,transparent 1px);background-size:34px 34px}.cta{max-width:1192px;margin:0 auto 32px;padding:36px 40px;display:flex;align-items:center;justify-content:space-between;gap:32px}.cta>*{position:relative;z-index:1}.cta h2{font-size:clamp(1.4rem,3.2vw,2rem);margin-top:10px;max-width:30ch;color:#f6f3ec}.cta .btn{flex-shrink:0}.foot{max-width:1240px;margin:0 auto;display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;padding:20px 24px 32px;font-size:.86rem;color:var(--ink-soft);border-top:1px solid var(--line)}.foot a{font-weight:700}.toast{position:fixed;left:50%;bottom:24px;transform:translate(-50%);padding:12px 18px;border-radius:99px;background:var(--ink);color:var(--paper);font-size:.9rem;font-weight:600;box-shadow:var(--shadow-lift);max-width:min(560px,92vw);z-index:50}.toast.error{background:var(--danger);color:#fff}.modal{position:fixed;inset:0;background:#12110f73;display:flex;align-items:center;justify-content:center;z-index:60}.modal-box{width:min(420px,92vw);display:flex;flex-direction:column;gap:12px}.spinner{display:inline-block;width:14px;height:14px;border:2px solid rgba(18,17,15,.25);border-top-color:var(--ink);border-radius:50%;animation:spin .7s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.rise{animation:rise .7s cubic-bezier(.2,.7,.2,1) both}.d1{animation-delay:.06s}.d2{animation-delay:.12s}.d3{animation-delay:.18s}.d4{animation-delay:.24s}@keyframes rise{0%{opacity:0;transform:translateY(14px)}to{opacity:1;transform:none}}@media(prefers-reduced-motion:reduce){.rise{animation:none}}@media(min-width:900px){.top-kicker{display:inline}}@media(max-width:860px){.wrap{grid-template-columns:1fr;padding:8px 16px 32px}.hero{padding:36px 16px 16px}.top-inner{padding:0 16px;min-height:62px}.logo{height:26px}.preview-card{min-height:420px}.cta{flex-direction:column;align-items:flex-start;margin:0 16px 24px;padding:28px 24px}.readout{display:none}.btn.small.pill{padding:6px 10px}}