:root{--bg:#94d7ff;--card:#f6f6f6;--panel-dark:#0b1220;--panel-shadow:rgba(15,23,32,.08);--accent:#0f1720;--muted:#5a5e67;--white:#ffffff}*{box-sizing:border-box}body{font-family:Inter,system-ui,Segoe UI,Roboto,Helvetica,Arial,sans-serif;margin:0;color:#0f1720;background:var(--bg)}.container{max-width:1100px;margin:0 auto;padding:24px}.site-header{background:transparent;padding:12px 0}.brand{margin:0;display:inline-block;font-weight:700}.btn{background:transparent;border:1px solid rgba(255,255,255,.08);color:var(--white);padding:8px 12px;border-radius:6px;text-decoration:none}.hero{padding:72px 0 92px;background:linear-gradient(145deg,#081024,#0f1720 60%,#13253a);color:#f5fbff}.hero-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:36px;align-items:center}.hero h2{font-size:42px;margin:0 0 16px;line-height:1.2}.hero-card{background:#ffffff0a;border:1px solid rgba(255,255,255,.12);border-radius:18px;padding:24px;box-shadow:0 24px 40px 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svg{width:var(--tool-icon-size);height:var(--tool-icon-size);display:block}.tool-list button.active{background:#5eead41f;border-color:#5eead466;color:#5eead4}.tool-panel.compact{--tool-button-size:44px;--tool-icon-size:24px;--tool-gap:6px;--panel-padding:8px 6px}.tool-panel.extra-compact{--tool-button-size:36px;--tool-icon-size:20px;--tool-gap:4px;--panel-padding:6px 4px}.sr-only{position:absolute!important;height:1px;width:1px;overflow:hidden;clip:rect(1px,1px,1px,1px);white-space:nowrap;border:0;padding:0;margin:-1px}.canvas-area{flex:1;margin-left:0;display:flex;align-items:stretch;background:transparent}.canvas-container{flex:1;min-height:100vh;border-radius:0;overflow:hidden;position:relative;width:100%;height:100vh;background:transparent;cursor:default}.canvas-container canvas{width:100%;height:100%;display:block;background:transparent;cursor:inherit}.canvas-container.cursor-hand,.canvas-container.cursor-hand canvas{cursor:grab}.selection-marquee{position:absolute;pointer-events:none;border:1px dashed rgba(94,234,212,.8);background:#5eead426;display:none}.selection-marquee.visible{display:block}.measurement-overlay{position:absolute;top:0;right:0;bottom:0;left:0;pointer-events:none}.measurement-label{position:absolute;transform:translate(-50%,-50%);padding:2px 8px;font-size:10px;font-weight:600;background:#0009;color:#fff;border-radius:12px;letter-spacing:.04em}.shape-menu{position:absolute;left:calc(var(--panel-width) + 12px);top:60px;display:none;flex-direction:row;background:var(--panel-dark);padding:8px;border-radius:8px;box-shadow:0 6px 18px var(--panel-shadow);gap:8px;z-index:40}.shape-menu{position:absolute;left:calc(var(--panel-width) + 12px);top:60px;display:none;flex-direction:row;background:var(--panel-dark);padding:8px;border-radius:8px;box-shadow:0 6px 18px #020617b3;gap:8px;z-index:100}.shape-menu.visible{display:flex}.shape-menu 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