:root{--bg:#f4f7fb;--card:#fff;--text:#172033;--muted:#667085;--line:#dce4ef;--blue:#0b4cab;--soft:#edf6ff;--shadow:0 8px 24px rgba(24,49,83,.08);--nav:rgba(255,255,255,.97)}html[data-theme=dark]{--bg:#0e1520;--card:#172131;--text:#eef4fb;--muted:#a9b7c8;--line:#2b3a4d;--blue:#62a6ff;--soft:#172a40;--nav:rgba(23,33,49,.97);color-scheme:dark}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif}.app{max-width:760px;min-height:100vh;margin:auto}.top{position:sticky;top:0;z-index:20;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;padding:11px 12px;border-bottom:1px solid var(--line);background:var(--card)}.back{color:var(--blue);text-decoration:none;font-weight:700;font-size:13px}.brand{font-weight:800;font-size:20px}.brand span{color:var(--blue)}.controls{display:flex;gap:5px}.control{max-width:76px;padding:7px 5px;border:1px solid var(--line);border-radius:9px;background:var(--card);color:var(--text);font-size:10px}.content{padding:18px 16px}.eyebrow{margin:0;color:var(--blue);font-size:11px;font-weight:900;letter-spacing:.08em}.content>h2{margin:5px 0 4px;font-size:28px}.intro{margin:0 0 18px;color:var(--muted);font-size:14px}.utility-item{margin:0 0 12px;border:1px solid var(--line);border-radius:16px;background:var(--card);box-shadow:var(--shadow);overflow:hidden}.utility-item summary{list-style:none;display:grid;grid-template-columns:46px 1fr auto;gap:12px;align-items:center;padding:16px;cursor:pointer;-webkit-tap-highlight-color:transparent}.utility-item summary::-webkit-details-marker{display:none}.utility-icon{display:grid;place-items:center;width:44px;height:44px;border-radius:12px;background:var(--soft);color:var(--blue);font-size:24px}.utility-item strong,.utility-item small{display:block}.utility-item strong{font-size:16px}.utility-item small{margin-top:4px;color:var(--muted);font-size:11px}.chevron{color:var(--blue);font-size:22px;font-weight:800}.chevron:after{content:'+'}.utility-item[open] .chevron:after{content:'−'}.utility-body{padding:0 16px 16px;border-top:1px solid var(--line)}.utility-body p{margin:13px 0;color:var(--muted);font-size:12px;line-height:1.5}.utility-divider{height:1px;margin:14px 0;background:var(--line)}.upcoming-item .utility-body{color:var(--muted)}.primary,.secondary{border:0;border-radius:9px;padding:10px 13px;font:800 12px system-ui;cursor:pointer}.primary{background:#0b4cab;color:#fff}.secondary{border:1px solid var(--line);background:var(--card);color:var(--blue)}.model-dialog{width:min(92vw,430px);border:1px solid var(--line);border-radius:18px;padding:0;background:var(--card);color:var(--text);box-shadow:0 22px 60px rgba(15,23,42,.32)}.model-dialog::backdrop{background:rgba(7,16,31,.72)}.model-dialog form{padding:19px}.model-dialog h2{margin:0 0 8px;font-size:20px}.model-dialog p{color:var(--muted);font-size:12px;line-height:1.45}.model-dialog label{display:block;margin:14px 0 6px;font-size:12px;font-weight:850}.model-dialog select{width:100%;padding:11px;border:1px solid var(--line);border-radius:9px;background:var(--card);color:var(--text)}.model-note{padding:9px;border-radius:9px;background:var(--soft)}.dialog-actions{display:flex;justify-content:flex-end;gap:8px;margin-top:15px}.fullscreen-tool{position:fixed;inset:0;z-index:3000;display:none;overflow:hidden;background:#fff;color:#111;touch-action:none}.fullscreen-tool.active{display:block}.fullscreen-tool canvas{display:block;width:100%;height:100%}.exit-button{position:fixed;top:calc(10px + env(safe-area-inset-top));right:10px;z-index:3020;border:0;border-radius:999px;padding:10px 15px;background:#0b4cab;color:#fff;font:900 12px system-ui;box-shadow:0 5px 18px rgba(15,23,42,.28)}.ruler-meta{position:fixed;top:calc(12px + 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12px;color:var(--muted);font-size:11px;text-align:center}.card-row{display:grid;grid-template-columns:52px auto 52px;gap:13px;align-items:center}.cal-button{width:52px;height:74px;border:0;border-radius:13px;background:#0b4cab;color:#fff;font:900 32px system-ui;box-shadow:0 5px 16px rgba(11,76,171,.25)}.virtual-card{position:relative;box-sizing:content-box;border:12px solid #0b4cab;border-radius:14px;background:rgba(11,76,171,.07)}.virtual-card:after{content:"";position:absolute;inset:0;border:1px dashed rgba(11,76,171,.38);border-radius:2px}.virtual-card span{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);color:#0b4cab;font-size:11px;font-weight:900;white-space:nowrap}.card-calibrator output{margin:8px 0;color:var(--muted);font-size:10px}body.tool-open{overflow:hidden}.calibration-screen.landscape .rotate-prompt{display:none}.calibration-screen.landscape .card-calibrator{display:flex}@media(max-width:520px){.top{grid-template-columns:auto 1fr auto;gap:5px;padding:9px 10px}.brand{font-size:18px;text-align:center}}@media(max-height:410px) and (orientation:landscape){.card-calibrator{padding:34px 52px 10px}.cal-button{height:64px}.virtual-card{border-width:10px}.exit-button{top:6px;right:6px;padding:8px 12px}}