:root{--bg-epaper: #F4F1EA;--bg-surface-alt: #EAE5DA;--ink-primary: #141413;--ink-construction: #C8C2B4;--core-crimson: #D92B2B;--core-cyan: #0088CC;--core-chartreuse: #7AB800;--font-display: "Space Grotesk", -apple-system, BlinkMacSystemFont, sans-serif;--font-mono: "Space Mono", monospace;--font-sans: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;--hud-pad: 24px;--crosshair-size: 10px;--header-height: 56px}*{box-sizing:border-box;margin:0;padding:0}html,body{width:100%;min-height:100%;background-color:var(--bg-epaper);color:var(--ink-primary);font-family:var(--font-sans);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;overflow-x:hidden;selection-background-color:var(--ink-primary);selection-color:var(--bg-epaper)}::selection{background:var(--ink-primary);color:var(--bg-epaper)}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:var(--bg-epaper)}::-webkit-scrollbar-thumb{background:var(--ink-construction)}::-webkit-scrollbar-thumb:hover{background:var(--ink-primary)}.steelfin-title{font-family:var(--font-display);font-size:clamp(3.5rem,8vw,7.5rem);font-weight:500;letter-spacing:-.04em;line-height:.92;color:var(--ink-primary);text-transform:uppercase;-webkit-user-select:none;user-select:none;pointer-events:none}.steelfin-subtitle{font-family:var(--font-mono);font-size:.75rem;letter-spacing:.12em;text-transform:uppercase;color:var(--ink-primary);opacity:.65;margin-bottom:.75rem;display:flex;align-items:center;gap:.5rem}.steelfin-subtitle:before{content:"";display:inline-block;width:6px;height:6px;background:var(--ink-primary)}.spec-bar-container{display:grid;grid-template-columns:repeat(3,1fr);gap:1.5rem;padding:.85rem 1.25rem;background:#f4f1ead9;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border:1px solid var(--ink-construction);box-shadow:0 2px 12px #1414130a}@media(max-width:768px){.steelfin-title{font-size:clamp(2.5rem,11vw,4.2rem)}.spec-bar-container{grid-template-columns:1fr;gap:.75rem;padding:.65rem .85rem}.spec-column{border-left:none;padding-left:0;border-bottom:1px solid var(--ink-construction);padding-bottom:.4rem}.spec-column:last-child{border-bottom:none;padding-bottom:0}}.spec-label{font-family:var(--font-mono);font-size:.65rem;text-transform:uppercase;letter-spacing:.08em;color:var(--ink-primary);opacity:.6}.spec-value{font-family:var(--font-mono);font-size:.85rem;font-weight:700;color:var(--ink-primary)}.corner-crosshair{position:fixed;width:var(--crosshair-size);height:var(--crosshair-size);pointer-events:none;z-index:100}.corner-crosshair:before,.corner-crosshair:after{content:"";position:absolute;background-color:var(--ink-primary)}.corner-crosshair:before{left:50%;top:0;bottom:0;width:1px;transform:translate(-50%)}.corner-crosshair:after{top:50%;left:0;right:0;height:1px;transform:translateY(-50%)}.crosshair-bl{left:var(--hud-pad);bottom:var(--hud-pad)}.crosshair-br{right:var(--hud-pad);bottom:var(--hud-pad)}.crosshair-tl{left:var(--hud-pad);top:var(--hud-pad)}.crosshair-tr{right:var(--hud-pad);top:var(--hud-pad)}.hatch-pattern{background-image:repeating-linear-gradient(45deg,transparent,transparent 7px,var(--ink-construction) 7px,var(--ink-construction) 8px);opacity:.35}.tech-button{font-family:var(--font-mono);font-size:.72rem;letter-spacing:.05em;text-transform:uppercase;padding:.5rem .85rem;background:transparent;color:var(--ink-primary);border:1px solid var(--ink-construction);cursor:pointer;transition:all .18s cubic-bezier(.16,1,.3,1);display:inline-flex;align-items:center;gap:.4rem}.tech-button:hover,.tech-button.active{background:var(--ink-primary);color:var(--bg-epaper);border-color:var(--ink-primary)}.tech-button.core-1.active{background:var(--core-crimson);border-color:var(--core-crimson)}.tech-button.core-2.active{background:var(--core-cyan);border-color:var(--core-cyan)}.tech-button.core-3.active{background:var(--core-chartreuse);border-color:var(--core-chartreuse)}.code-block{font-family:var(--font-mono);font-size:.75rem;line-height:1.5;background:#efebe1;border:1px solid var(--ink-construction);padding:1rem;border-left:3px solid var(--ink-primary);overflow-x:auto}.code-block .hl{background:#d92b2b26;color:var(--core-crimson);font-weight:700;display:inline-block;padding:0 4px}.steelfin-scene-footer{position:relative;z-index:10;display:flex;justify-content:space-between;align-items:flex-end;pointer-events:none;gap:1.5rem}@media(max-width:900px){.steelfin-scene-footer{flex-direction:column;align-items:stretch;gap:1rem}.steelfin-title{font-size:clamp(2.4rem,10vw,3.8rem)}.hud-header-nav{overflow-x:auto;max-width:55vw;white-space:nowrap}.hud-header-desktop-only{display:none!important}.corner-crosshair{display:none}}