*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--bg: #f8f9fb;--surface: #ffffff;--border: #e2e8f0;--text: #1e293b;--text-muted: #64748b;--primary: #3b82f6;--primary-hover: #2563eb;--primary-light: #eff6ff;--danger: #ef4444;--radius: 12px;--shadow: 0 1px 3px rgba(0, 0, 0, .08), 0 4px 12px rgba(0, 0, 0, .04);--shadow-lg: 0 4px 24px rgba(0, 0, 0, .1)}body{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;min-height:100vh}.hidden{display:none!important}.header{background:var(--surface);border-bottom:1px solid var(--border);padding:16px 24px}.header-inner{max-width:1400px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:8px}.logo{display:flex;align-items:center;gap:10px;font-size:1.25rem;font-weight:700;color:var(--primary)}.tagline{font-size:.875rem;color:var(--text-muted)}.main{max-width:1400px;margin:0 auto;padding:32px 24px 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span{position:static;transform:none;font-size:.8125rem}input[type=number],input[type=text],select{width:100%;padding:10px 12px;border:1px solid var(--border);border-radius:8px;font-size:.9375rem;font-family:inherit;background:var(--bg);transition:border-color .15s}input[type=number]:focus,input[type=text]:focus,select:focus{outline:none;border-color:var(--primary)}input[type=range]{width:100%;accent-color:var(--primary)}.ratio-btn{background:var(--bg);border:1px solid var(--border);border-radius:8px;padding:8px 10px;cursor:pointer;font-size:1rem;transition:background .15s}.ratio-btn:hover{background:var(--border)}.presets{display:flex;flex-wrap:wrap;gap:6px;margin-top:10px}.preset-btn{padding:4px 10px;font-size:.75rem;border:1px solid var(--border);border-radius:6px;background:var(--bg);cursor:pointer;font-family:inherit;color:var(--text-muted);transition:all 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