:root{--bg: #f4efe6;--surface: #fffcf6;--subtle: #efe7da;--text: #241f19;--text-2: #4a4239;--muted: #7b7064;--border: #e3d8c7;--border-strong: #cdbfa9;--ink: #241f19;--ink-text: #fffcf6;--accent: #c2410c;--accent-soft: #fbe8da;--sign: #f2c230;--sign-soft: #fbedc0;--ok: #3f6b2a;--ok-soft: #ecf1df;--warn: #8a5a00;--warn-soft: #fbf0d3;--error: #a3261b;--error-soft: #f8e3df;--grid: rgba(70, 110, 160, .1);--cab: #2e3a4a;--cab-window: #dde6ee;--steel: #4a4239;--tyre: #241f19;--rim: #d8cdbb;--crate: #e2c592;--crate-edge: #b08a4f;--shadow: 0 1px 0 rgba(60, 40, 20, .06);--shadow-lg: 0 10px 24px -14px rgba(60, 40, 20, .35);--radius: 10px;--font: "Source Sans 3", "Segoe UI", system-ui, sans-serif;--serif: "Fraunces", Georgia, "Times New Roman", serif;--hand: "Caveat", "Segoe Print", "Bradley Hand", cursive;color-scheme:light}@media (prefers-color-scheme: dark){:root{--bg: #1a1713;--surface: #221e19;--subtle: #2b2620;--text: #f1ebe1;--text-2: #d6cdbf;--muted: #a3988a;--border: #3a332b;--border-strong: #4d443a;--ink: #f1ebe1;--ink-text: #1a1713;--accent: #f08a4b;--accent-soft: #3a2416;--sign: #e8b923;--sign-soft: #3a3016;--ok: #9cc47f;--ok-soft: #1f2a17;--warn: #e3b552;--warn-soft: #33290f;--error: #f08a7e;--error-soft: #3a1b17;--grid: rgba(160, 190, 230, .07);--cab: #6c7d93;--cab-window: #b9c6d3;--steel: #a3988a;--tyre: #0d0b09;--rim: #5c5247;--crate: #9c8156;--crate-edge: #745d38;--shadow: none;--shadow-lg: none;color-scheme:dark}}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font:16px/1.55 var(--font);-webkit-font-smoothing:antialiased}button{font:inherit;color:inherit}b,strong{font-weight:650}h1,h2,h3{font-family:var(--serif);font-weight:600;letter-spacing:-.01em}.nav{position:sticky;top:0;z-index:20;background:color-mix(in srgb,var(--bg) 82%,transparent);-webkit-backdrop-filter:saturate(180%) blur(12px);backdrop-filter:saturate(180%) blur(12px);border-bottom:1px solid var(--border)}.nav-inner{max-width:1040px;margin:0 auto;padding:10px 20px;display:flex;align-items:center;gap:24px}.brand{display:flex;align-items:center;gap:8px;color:var(--text);text-decoration:none}.brand-name{font-family:var(--serif);font-weight:600;font-size:1.12rem}.brand-mark{width:34px;height:34px;display:grid;place-items:center}.brand-mark svg{width:34px;height:34px}.brand-mark .sign{fill:var(--sign);stroke:#241f19;stroke-width:1.6}.brand-mark .cog-ring{fill:#fffcf6;stroke:#241f19;stroke-width:1.4}.brand-mark .cog-fill{fill:#241f19}.nav-links{display:flex;gap:4px}.nav-links a{padding:6px 12px;border-radius:8px;color:var(--muted);text-decoration:none;font-weight:500;font-size:.92rem}.nav-links a:hover{color:var(--text);background:var(--subtle)}.nav-links a.active{color:var(--text);background:none;box-shadow:inset 0 -3px 0 var(--sign);border-radius:0}.nav-menu{display:flex;align-items:center;gap:24px;flex:1}.nav-reset{margin-left:auto}.menu-toggle,.nav-backdrop{display:none}@media (max-width: 640px){.nav-inner{padding:10px 16px;position:relative}.menu-toggle{display:grid;place-items:center;margin-left:auto;width:40px;height:40px;cursor:pointer;border-radius:10px;border:1px solid var(--border);background:var(--surface)}.burger{position:relative;width:18px;height:12px}.burger span{position:absolute;left:0;width:100%;height:2px;border-radius:2px;background:var(--text);transition:transform .2s,opacity .2s,top .2s}.burger span:nth-child(1){top:0}.burger span:nth-child(2){top:5px}.burger span:nth-child(3){top:10px}.burger.open span:nth-child(1){top:5px;transform:rotate(45deg)}.burger.open span:nth-child(2){opacity:0}.burger.open span:nth-child(3){top:5px;transform:rotate(-45deg)}.nav-menu{display:none;position:absolute;top:100%;left:0;right:0;flex-direction:column;align-items:stretch;gap:12px;padding:8px 16px 16px;background:var(--surface);border-bottom:1px solid var(--border);box-shadow:0 16px 32px -16px #0003}.nav-menu.open{display:flex;animation:menu-in .15s ease-out}.nav-links{flex-direction:column;gap:2px}.nav-links a{padding:12px;font-size:1rem;border-radius:10px}.nav-reset{margin-left:0;width:100%;padding:11px 16px;font-size:.95rem}.nav-backdrop{display:block;position:fixed;top:0;right:0;bottom:0;left:0;z-index:15;background:#00000040}}@keyframes menu-in{0%{opacity:0;transform:translateY(-4px)}}.btn{cursor:pointer;border-radius:10px;padding:10px 18px;font-weight:550;font-size:.92rem;border:1px solid transparent;transition:opacity .15s,background .15s,border-color .15s}.btn.primary{background:var(--ink);color:var(--ink-text)}.btn.primary{box-shadow:0 2px #00000040}.btn.primary:hover:not(:disabled){opacity:.9}.btn.primary:active:not(:disabled){transform:translateY(1px);box-shadow:none}.btn.primary:disabled{opacity:.3;cursor:not-allowed}.btn.secondary,.btn.subtle{background:var(--surface);border-color:var(--border);color:var(--text)}.btn.secondary:hover,.btn.subtle:hover{border-color:var(--border-strong);background:var(--subtle)}.btn.small,.btn.subtle{padding:6px 12px;font-size:.85rem;border-radius:8px}.link{background:none;border:0;padding:0;color:var(--text);font-weight:550;cursor:pointer;text-decoration:underline;text-decoration-color:var(--border-strong);text-underline-offset:3px}.link:hover{text-decoration-color:currentColor}.main{max-width:1040px;margin:0 auto;padding:28px 20px 0;display:flex;flex-direction:column;gap:20px}@media (max-width: 560px){.main{padding:20px 16px 0}}.page{display:flex;flex-direction:column;gap:16px}.page-head h1{margin:0;font-size:clamp(1.7rem,4.5vw,2.3rem);line-height:1.15}.page-head p{margin:8px 0 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.stepper-label{color:var(--text)}.stepper-dot{flex:none;width:24px;height:24px;border-radius:50%;display:grid;place-items:center;font-size:.75rem;font-weight:600;border:1px solid var(--border-strong);background:var(--surface)}.stepper-item.current{color:var(--text)}.stepper-item.current .stepper-dot{background:var(--sign);color:#241f19;border-color:#241f19}.stepper-item.done{color:var(--text-2)}.stepper-item.done .stepper-dot{background:var(--subtle);border-color:var(--border);color:var(--text)}.stepper-text{display:flex;align-items:baseline;gap:6px}.stepper-label{font-weight:550;font-size:.88rem}.stepper-value{font-size:.78rem;color:var(--muted)}@media (max-width: 560px){.stepper-item:not(:last-child):after{width:10px;margin-left:2px}.stepper-value{display:none}.stepper-item{padding-right:2px}}.table-cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:10px}@media (max-width: 560px){.table-cards{grid-template-columns:minmax(0,1fr)}}.table-card{display:flex;gap:14px;align-items:center;text-align:left;cursor:pointer;padding:12px;border-radius:var(--radius);border:1px solid var(--border);background:var(--surface);box-shadow:var(--shadow);transition:border-color .15s,box-shadow .15s}.table-card:hover{border-color:var(--border-strong);box-shadow:var(--shadow-lg)}.table-card.selected{border-color:var(--text);box-shadow:inset 4px 0 0 var(--sign)}.table-card:active{transform:translateY(1px)}.road-sign{flex:none;width:56px;height:56px;border-radius:7px;background:#fff;color:#111;border:2px solid #111;box-shadow:inset 0 0 0 2px #fff,inset 0 0 0 3px #111;display:flex;flex-direction:column;align-items:center;justify-content:center;line-height:1}.road-sign-class{font-weight:700;font-size:.72rem}.road-sign-weight{font-weight:800;font-size:1.25rem;margin-top:2px}.table-card-body{display:flex;flex-direction:column;min-width:0;flex:1}.table-card-title{font-family:var(--serif);font-weight:600;font-size:1.1rem}.table-card-facts{font-size:.82rem;color:var(--muted)}.table-card-arrow{width:18px;height:18px;fill:none;stroke:var(--muted);stroke-width:2;flex:none}.table-card:hover .table-card-arrow{stroke:var(--text)}.upload{display:flex;flex-direction:column}.dropzone{display:flex;align-items:center;gap:14px;cursor:pointer;padding:16px;border-radius:var(--radius);border:1px dashed var(--border-strong);background:var(--surface);transition:border-color .15s,background .15s}.dropzone:hover{border-color:var(--text)}.dropzone.busy{cursor:progress}.dropzone 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20%,transparent)}.main>.alert,.result>.alert{margin:0}.vehicle-step{padding-bottom:84px}.field{display:flex;flex-direction:column;gap:6px;flex:1;min-width:0}.field-label,.control-label{font-weight:550;font-size:.85rem;color:var(--text-2)}.field-row{display:flex;gap:14px;flex-wrap:wrap;margin-top:14px}.field-row>.field{min-width:200px}input,select{font:inherit;padding:9px 12px;border-radius:10px;border:1px solid var(--border);background:var(--surface);color:var(--text);width:100%;font-variant-numeric:tabular-nums;transition:border-color .15s,box-shadow .15s}input:hover,select:hover{border-color:var(--border-strong)}input:focus,select:focus{outline:none;border-color:var(--text);box-shadow:0 0 0 3px color-mix(in srgb,var(--text) 10%,transparent)}input::placeholder{color:color-mix(in srgb,var(--muted) 55%,transparent)}.number-input{position:relative;display:flex;align-items:center}.number-input input{padding-right:40px}.number-input .unit{position:absolute;right:12px;color:var(--muted);font-size:.78rem;pointer-events:none}.segmented{display:inline-flex;padding:3px;gap:2px;border-radius:10px;background:var(--subtle)}.segmented button{cursor:pointer;min-width:40px;padding:6px 12px;border-radius:7px;border:0;background:transparent;color:var(--muted);font-weight:550}.segmented button:hover{color:var(--text)}.segmented button.active{background:var(--surface);color:var(--text);box-shadow:0 1px #0000001f,0 0 0 1px var(--border-strong)}.weight-grid{display:grid;grid-template-columns:max-content minmax(0,1fr) minmax(0,1fr);gap:10px 12px;align-items:center}.col-head{font-weight:550;font-size:.8rem;color:var(--muted);display:flex;flex-direction:column;line-height:1.2}.col-head small{font-weight:400;font-size:.72rem}.row-head{font-weight:550;font-size:.86rem;color:var(--text-2)}@media (max-width: 560px){.weight-grid{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}.weight-grid>span:first-child{display:none}.row-head{grid-column:1 / -1;margin-top:4px}}.driver-chip{color:var(--accent)}.toggles{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:8px}.toggle{display:flex;align-items:flex-start;gap:12px;cursor:pointer;padding:12px;border-radius:12px;border:1px solid var(--border);background:var(--surface);transition:border-color .15s}.toggle:hover{border-color:var(--border-strong)}.toggle.on{border-color:var(--text)}.toggle input{position:absolute;opacity:0;width:1px;height:1px}.toggle-text{display:flex;flex-direction:column;font-weight:500;font-size:.88rem;line-height:1.35}.toggle-text small{color:var(--muted);font-weight:400;font-size:.76rem;margin-top:2px}.switch{flex:none;width:34px;height:20px;border-radius:99px;background:var(--border-strong);position:relative;transition:background .15s}.switch:after{content:"";position:absolute;top:2px;left:2px;width:16px;height:16px;border-radius:50%;background:#fff;transition:transform .15s;box-shadow:0 1px 2px #00000040}.toggle.on .switch{background:var(--ink)}.toggle.on .switch:after{transform:translate(14px);background:var(--ink-text)}.toggle input:focus-visible+.switch{outline:2px solid var(--text);outline-offset:2px}.axles-controls{display:flex;align-items:flex-end;gap:18px;flex-wrap:wrap;margin-bottom:16px}.control{display:flex;flex-direction:column;gap:6px}.wheel-formula{margin-left:auto;font-weight:700;font-size:1.15rem;padding:4px 10px;border-radius:8px;background:var(--subtle)}.axle-track{display:flex;align-items:flex-start;overflow-x:auto;padding:2px}.axle-slot{display:flex;align-items:flex-start;flex:none}.axle{width:88px;display:flex;flex-direction:column;align-items:center;gap:2px;cursor:pointer;padding:10px 6px;border-radius:12px;border:1px solid var(--border);background:var(--surface);transition:border-color .15s}.axle:hover{border-color:var(--border-strong)}.axle.driven{border-color:var(--accent);background:var(--accent-soft)}.axle-group{font-size:.66rem;font-weight:600;text-transform:uppercase;letter-spacing:.08em;color:var(--muted)}.axle-wheel{width:36px;height:36px;margin:2px 0}.axle-wheel .tyre{fill:var(--tyre)}.axle-wheel .rim{fill:var(--rim)}.axle.driven .axle-wheel .rim{fill:var(--accent)}.axle-wheel .drive-mark{fill:#fff}.axle-name{font-weight:600;font-size:.84rem}.axle-state{font-size:.72rem;color:var(--muted)}.axle.driven .axle-state{color:var(--accent);font-weight:600}.axle-tyre{font-family:var(--hand);font-size:.95rem;color:var(--text-2);line-height:1}.axle-gap{width:124px;display:flex;flex-direction:column;padding:34px 8px 0;position:relative}.axle-gap-line{position:absolute;top:52px;left:0;right:0;height:1px;background:var(--border-strong)}.axle-gap .number-input{position:relative;z-index:1}.axle-gap input{text-align:center;padding:7px 32px 7px 8px}@media (max-width: 640px){.axle-track{flex-direction:column;align-items:stretch;overflow:visible;padding:0}.axle-slot{flex-direction:column;align-items:stretch}.axle{width:100%;display:grid;grid-template-columns:36px 1fr auto;grid-template-areas:"wheel name group" "wheel state tyre";align-items:center;text-align:left;gap:0 12px;padding:8px 12px}.axle-wheel{grid-area:wheel}.axle-name{grid-area:name}.axle-state{grid-area:state}.axle-group{grid-area:group}.axle-tyre{grid-area:tyre;text-align:right}.axle-gap{width:auto;flex-direction:row;align-items:center;padding:8px 0 8px 60px}.axle-gap-line{top:0;bottom:0;left:29px;right:auto;width:1px;height:auto}.axle-gap .number-input{max-width:170px}.wheel-formula{margin-left:0}}.action-bar{position:fixed;left:0;right:0;bottom:0;z-index:10;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:12px max(20px,calc((100vw - 1040px)/2 + 20px));background:color-mix(in srgb,var(--bg) 85%,transparent);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-top:1px solid var(--border)}.action-status{font-size:.84rem;color:var(--muted);min-width:0}.action-status .ready{color:var(--ok);font-weight:550}@media (max-width: 560px){.action-bar{flex-direction:column;align-items:stretch;padding:10px 16px}.action-bar .btn{width:100%}}.result{display:flex;flex-direction:column;gap:16px}.hero-head{display:flex;justify-content:space-between;align-items:flex-start;gap:16px;flex-wrap:wrap}.hero-lead,.hero-sub{margin:0;font-family:var(--serif);font-size:clamp(1.1rem,2.6vw,1.35rem);color:var(--text-2)}.hero-number{font-family:var(--serif);font-size:clamp(3rem,9vw,4.4rem);font-weight:700;line-height:1.05;color:var(--accent);font-variant-numeric:tabular-nums;margin:2px 0}.hero-number{background:linear-gradient(transparent 62%,var(--sign-soft) 62%,var(--sign-soft) 92%,transparent 92%);display:inline-block;padding:0 4px}.hero-meta{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.hero-vehicle{font-size:.9rem;color:var(--muted)}.stats{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));border:1px solid var(--border);border-radius:12px;overflow:hidden;margin-top:6px}.stats div{padding:10px 14px;display:flex;flex-direction:column;border-right:1px solid var(--border)}.stats div:last-child{border-right:0}.stats span{font-size:.74rem;color:var(--muted)}.stats strong{font-variant-numeric:tabular-nums;font-size:1rem}@media (max-width: 720px){.stats{grid-template-columns:repeat(2,minmax(0,1fr))}.stats div:nth-child(2){border-right:0}.stats div:nth-child(-n+2){border-bottom:1px solid var(--border)}}.result-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:16px;align-items:start}.result-col{display:flex;flex-direction:column;gap:16px;min-width:0}@media (max-width: 900px){.result-grid{grid-template-columns:minmax(0,1fr)}}.truck{width:100%;max-width:820px;height:auto;display:block;margin:8px auto 4px}.truck text{font-family:var(--font)}.truck .ground{stroke:var(--border);stroke-width:2}.truck .chassis,.truck .platform-floor{fill:var(--steel)}.truck .platform{fill:none;stroke:var(--border-strong);stroke-width:1.5;stroke-dasharray:6 5}.truck .tail-light{fill:#ef4444}.truck .load rect{fill:var(--crate);stroke:var(--crate-edge);stroke-width:1.2}.truck .cab{stroke:none}.truck .cab-light,.truck .cab-dark{stop-color:var(--cab)}.truck .window{fill:var(--cab-window);stroke:none;opacity:.9}.truck .door-line{stroke:color-mix(in srgb,var(--cab-window) 35%,transparent);stroke-width:1.2}.truck .door-handle{fill:var(--cab-window);opacity:.6}.truck .bumper,.truck .mirror,.truck .cab-step{fill:var(--steel)}.truck .mirror-arm{stroke:var(--steel);stroke-width:2}.truck .spoiler{fill:var(--cab)}.truck .grille{fill:var(--cab-window);opacity:.35}.truck 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