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solid #ddd;background-color:#efeeea}.tool-card h3{font-size:15px;margin:0;font-weight:bold}.tool-card p{font-size:14px;color:#555;margin:0}@media(max-width: 640px){.brand-copy{font-size:10px !important}nav{font-size:10px !important}}.sp-only{display:none}@media(max-width: 420px){.sp-only{display:inline}}footer{border-top:1px solid #ededed}.footer-inner{max-width:960px;margin:0 auto;padding:28px 20px 16px;display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:20px}.footer-inner h4{font-size:14px;margin:0 0 10px;font-weight:bold}.footer-brand p{font-size:14px;color:#555;max-width:28em;margin-top:8px}.footer-links{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:8px;font-size:14px}.footer-links a:hover{text-decoration:underline}.footer-bottom{max-width:960px;margin:0 auto;padding:12px 20px 20px;border-top:1px solid #ededed;font-size:13px;color:#777;display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px}@media(max-width: 640px){.footer-inner{grid-template-columns:1fr 1fr}.footer-brand{grid-column:1/-1}}@media(max-width: 420px){.footer-inner{grid-template-columns:1fr}}:root{--bg: #ffffff;--surface: #f5f5f5;--surface2: #eeeeee;--border: #d8d8d8;--border-bright: #aaaaaa;--text: #1a1a1a;--text-muted: #555555;--text-dim: #999999;--accent: #007bff;--accent-dim: #66a3e0;--radius: 4px;--font-body: Helvetica, Arial, "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Yu Gothic Medium", "Yu Gothic", sans-serif;--font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;--preview-portrait: #cfe2ff;--preview-landscape: #d4f5df;--preview-square: #e6e0f2;--bleed-line: #ffffff;--bleed-line-shadow: rgba(0, 0, 0, 0.35)}*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}html,body{height:100%}a{color:inherit;text-decoration:none}body{font-family:var(--font-body);background:var(--bg);color:var(--text);font-weight:300}header{flex-shrink:0}.header-inner{max-width:960px;margin:0 auto;padding:5px 20px;display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}.brand-block{display:flex;align-items:center;gap:10px}.brand-link{display:inline-flex;align-items:center;gap:6px}.brand-logo{height:20px;width:20px;display:block;flex-shrink:0}.brand-name{font-size:14px;font-weight:bold;white-space:nowrap}.brand-copy{font-size:12px;color:#666;line-height:110%}header nav{display:flex;gap:20px;font-size:14px}header nav a:hover{text-decoration:underline}.sp-only{display:none}@media(max-width: 640px){.brand-copy{font-size:10px !important}header nav{font-size:10px !important}}@media(max-width: 420px){.sp-only{display:inline}}@media(min-width: 769px){.app-frame{height:100vh;display:flex;flex-direction:column;overflow:hidden}.app-wrapper{flex:1;min-height:0;display:grid;grid-template-columns:380px 1fr;overflow:hidden}.left-panel{padding:20px;overflow-y:auto;display:flex;flex-direction:column;gap:18px}.right-panel{display:flex;flex-direction:column;overflow:hidden}.preview-area{flex:1;display:flex;align-items:center;justify-content:center;overflow:auto;padding:32px 32px 16px}}@media(max-width: 768px){.app-wrapper{display:flex;flex-direction:column}.left-panel{padding:16px;display:flex;flex-direction:column;gap:16px}.right-panel{display:flex;flex-direction:column}.preview-area{padding:24px 16px 16px;display:flex;align-items:flex-start;justify-content:flex-start;overflow-x:auto}}.section-title{font-family:var(--font-mono);font-size:13px;letter-spacing:.1em;color:var(--text-muted);text-transform:uppercase;margin:0 0 12px}.tool-grid{display:grid;grid-template-columns:repeat(auto-fill, minmax(220px, 1fr));gap:14px}.tool-card{padding:18px;display:flex;flex-direction:column;gap:8px;border-radius:12px;border:1px solid #ededed;background-color:#fff;box-shadow:0 4px 12px rgba(0,0,0,.05)}a.tool-card:hover{border:1px solid #ddd;background-color:#efeeea}.tool-card h3{font-size:15px;margin:0;font-weight:bold}.tool-card p{font-size:14px;color:#555;margin:0}.tool-title{font-size:18px;font-weight:500;color:var(--text)}.size-group{margin-bottom:4px}.size-row{display:flex;flex-wrap:wrap;align-items:center;gap:5px;margin-bottom:5px}.size-row .cat{font-family:var(--font-mono);font-size:13px;color:var(--text-muted);min-width:54px;flex-shrink:0;letter-spacing:.06em}.size-btn{display:inline-block;padding:4px 9px;border:1px solid var(--border);border-radius:var(--radius);text-decoration:none;color:var(--text-muted);font-family:var(--font-mono);font-size:11px;background:rgba(0,0,0,0);transition:border-color .12s,color .12s,background .12s;white-space:nowrap;cursor:pointer}.size-btn:hover{border-color:var(--border-bright);color:var(--text)}.size-btn.active{background:var(--surface2);border-color:var(--accent-dim);color:var(--accent)}.divider{border:none;border-top:1px 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var(--border);border-radius:var(--radius);font-family:var(--font-mono);font-size:14px;color:var(--text);background:var(--bg);outline:none;transition:border-color .12s}.field-row input:focus{border-color:var(--border-bright)}.field-row input.invalid{border-color:#c0392b;background:#fff5f5}.field-row .unit{font-family:var(--font-mono);font-size:13px;color:var(--text-muted);white-space:nowrap}.combined-row .size-input{width:56px;flex-shrink:0;text-align:center}.combined-row .multiply{font-family:var(--font-mono);font-size:14px;color:var(--text-muted);flex-shrink:0}.combined-row .action-btn{margin-left:auto}.size-output{display:inline-flex;align-items:center;justify-content:center;width:56px;flex-shrink:0;padding:6px 4px;border:1px solid var(--border);border-radius:var(--radius);font-family:var(--font-mono);font-size:13px;color:var(--text);background:var(--surface)}.px-note{margin-top:6px;font-family:var(--font-mono);font-size:11px;color:var(--text-dim);letter-spacing:.03em;min-height:14px}.btn-row{display:flex;gap:6px;flex-wrap:wrap}.action-btn{padding:6px 12px;font-family:var(--font-mono);font-size:11px;border:1px solid var(--border);border-radius:var(--radius);background:rgba(0,0,0,0);color:var(--text-muted);cursor:pointer;transition:border-color .12s,color .12s,background .12s;letter-spacing:.04em;white-space:nowrap;min-width:6.5em}.action-btn:hover{border-color:var(--border-bright);color:var(--text)}.action-btn.copied{background:var(--surface2);border-color:var(--accent-dim);color:var(--accent)}.swap-btn{padding:6px 12px;font-family:var(--font-mono);font-size:11px;border:1px solid var(--border-bright);border-radius:var(--radius);background:rgba(0,0,0,0);color:var(--text);cursor:pointer;transition:background .12s;letter-spacing:.04em;white-space:nowrap}.swap-btn:hover{background:var(--surface2)}.bleed-btn{padding:6px 12px;font-family:var(--font-mono);font-size:11px;border:1px solid var(--border-bright);border-radius:var(--radius);background:rgba(0,0,0,0);color:var(--text);cursor:pointer;transition:background .12s,border-color .12s,color .12s;letter-spacing:.04em;white-space:nowrap}.bleed-btn:hover{background:var(--surface2)}.bleed-btn.active{background:var(--surface2);border-color:var(--accent-dim);color:var(--accent)}.bleed-btn.active::before{content:"✓ "}#errorMsg{font-family:var(--font-mono);font-size:13px;color:#c0392b;min-height:16px;letter-spacing:.04em}#previewWrap{position:relative;padding-left:56px;padding-top:30px;display:inline-block;flex-shrink:0}@keyframes paperChange{0%{opacity:0;transform:scale(0.94)}100%{opacity:1;transform:scale(1)}}#preview{border-radius:2px;box-shadow:0 0 0 1px rgba(0,0,0,.08),0 8px 32px rgba(0,0,0,.14),0 2px 8px rgba(0,0,0,.1);transition:width .32s cubic-bezier(0.4, 0, 0.2, 1),height .32s cubic-bezier(0.4, 0, 0.2, 1);position:relative;overflow:hidden}#preview.animating{animation:paperChange .28s cubic-bezier(0.4, 0, 0.2, 1) forwards}#preview.portrait{background:var(--preview-portrait)}#preview.landscape{background:var(--preview-landscape)}#preview.square{background:var(--preview-square)}#bleedInner{position:absolute;display:none;border:1.5px dashed rgba(0,0,0,.55);pointer-events:none;transition:top .32s cubic-bezier(0.4, 0, 0.2, 1),left .32s cubic-bezier(0.4, 0, 0.2, 1),right .32s cubic-bezier(0.4, 0, 0.2, 1),bottom .32s cubic-bezier(0.4, 0, 0.2, 1)}#preview.bleed-on #bleedInner{display:block}#previewNotice{display:none;position:absolute;inset:0;align-items:center;justify-content:center;text-align:center;padding:8px;font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--text-muted);pointer-events:none}#preview.extreme #previewNotice{display:flex}#preview.extreme #bleedInner{display:none}#widthLabel{position:absolute;top:5px;left:56px;display:flex;justify-content:center;align-items:center;font-family:var(--font-mono);font-size:13px;color:var(--text-muted);white-space:nowrap;pointer-events:none;letter-spacing:.06em}#heightLabel{position:absolute;left:0;top:30px;width:52px;display:flex;flex-direction:column;justify-content:center;align-items:center;font-family:var(--font-mono);font-size:13px;color:var(--text-muted);line-height:1.4;pointer-events:none;letter-spacing:.06em}#widthLine{position:absolute;top:20px;left:56px;height:1px;background:linear-gradient(to right, transparent, var(--border), transparent);pointer-events:none;transition:width .32s cubic-bezier(0.4, 0, 0.2, 1)}#heightLine{position:absolute;left:51px;top:30px;width:1px;background:linear-gradient(to bottom, transparent, var(--border), transparent);pointer-events:none;transition:height .32s cubic-bezier(0.4, 0, 0.2, 1)}