:root{--bg-primary:#0f172a;--bg-secondary:#1e293b;--bg-tertiary:#334155;--bg-surface:#1e293b;--bg-surface-hover:#334155;--border-color:#475569;--border-subtle:#334155;--text-primary:#f1f5f9;--text-secondary:#94a3b8;--text-muted:#64748b;--accent:#4393e4;--accent-hover:#5ba3f5;--accent-subtle:#4393e426;--danger:#ef4444;--warning:#f59e0b;--warning-bg:#f59e0b1a;--warning-border:#f59e0b4d;--success:#22c55e;--radius:8px;--radius-lg:12px;--shadow:0 4px 6px -1px #0000004d, 0 2px 4px -2px #0003;--shadow-lg:0 10px 15px -3px #0006, 0 4px 6px -4px #0000004d;--transition:.15s cubic-bezier(.4, 0, .2, 1);--font-sans:"Inter", "Noto Sans JP", system-ui, sans-serif}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html{-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-size:16px}body{font-family:var(--font-sans);background:var(--bg-primary);color:var(--text-primary);min-height:100vh;line-height:1.6}.app{flex-direction:column;min-height:100vh;display:flex}.app-header{border-bottom:1px solid var(--border-subtle);background:var(--bg-secondary);align-items:center;gap:12px;padding:16px 24px;display:flex}.app-logo{align-items:center;gap:10px;display:flex}.app-logo-icon{background:linear-gradient(135deg, var(--accent), #7c3aed);border-radius:var(--radius);color:#fff;justify-content:center;align-items:center;width:32px;height:32px;font-size:16px;font-weight:700;display:flex}.app-title{letter-spacing:-.02em;font-size:18px;font-weight:700}.app-subtitle{color:var(--text-muted);margin-left:auto;font-size:12px}.app-main{flex:1;grid-template-columns:440px 1fr;display:grid;overflow:hidden}.panel-left{border-right:1px solid var(--border-subtle);background:var(--bg-secondary);flex-direction:column;max-height:calc(100vh - 65px);display:flex;overflow-y:auto}.panel-section{border-bottom:1px solid var(--border-subtle);padding:16px 20px}.panel-section:last-child{border-bottom:none}.section-header{justify-content:space-between;align-items:center;margin-bottom:10px;display:flex}.section-title{text-transform:uppercase;letter-spacing:.08em;color:var(--text-muted);font-size:11px;font-weight:600}.section-actions{gap:6px;display:flex}.btn-sm{background:var(--bg-tertiary);height:24px;color:var(--text-secondary);border:1px solid var(--border-color);cursor:pointer;transition:all var(--transition);border-radius:4px;padding:3px 8px;font-size:11px}.btn-sm:hover{background:var(--bg-surface-hover);color:var(--text-primary)}.mermaid-input{background:var(--bg-primary);border:1px solid var(--border-color);border-radius:var(--radius);width:100%;min-height:200px;color:var(--text-primary);resize:vertical;transition:border-color var(--transition);outline:none;padding:12px;font-family:JetBrains Mono,Fira Code,Consolas,monospace;font-size:13px;line-height:1.5}.mermaid-input:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-subtle)}.mermaid-input::placeholder{color:var(--text-muted)}.settings-grid{grid-template-columns:1fr 1fr;gap:12px;display:grid}.setting-item{flex-direction:column;gap:4px;display:flex}.setting-item.full-width{grid-column:1/-1}.setting-label{color:var(--text-secondary);font-size:12px;font-weight:500}.setting-input,.setting-select{background:var(--bg-primary);border:1px solid var(--border-color);color:var(--text-primary);transition:border-color var(--transition);font-size:13px;font-family:var(--font-sans);border-radius:6px;outline:none;height:34px;padding:6px 10px}.setting-input:focus,.setting-select:focus{border-color:var(--accent);box-shadow:0 0 0 2px var(--accent-subtle)}.setting-select{cursor:pointer;appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%2394A3B8' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10z'/%3E%3C/svg%3E");background-position:right 8px center;background-repeat:no-repeat;padding-right:28px}.color-picker-wrapper{background:var(--bg-primary);border:1px solid var(--border-color);border-radius:6px;align-items:center;gap:8px;height:34px;padding:4px 8px;display:flex}.color-picker-input{appearance:none;cursor:pointer;background:0 0;border:none;border-radius:4px;width:24px;height:24px;padding:0}.color-picker-input::-webkit-color-swatch-wrapper{padding:0}.color-picker-input::-webkit-color-swatch{border:1px solid #fff3;border-radius:4px}.color-picker-input::-moz-color-swatch{border:1px solid #fff3;border-radius:4px}.color-hex-text{color:var(--text-primary);text-transform:uppercase;font-family:JetBrains Mono,monospace;font-size:12px}.palette-presets{gap:6px;margin-top:4px;display:flex}.preset-dot{cursor:pointer;border:2px solid #0000;border-radius:50%;width:20px;height:20px;transition:transform .12s,border-color .12s;box-shadow:0 1px 3px #0000004d}.preset-dot:hover{transform:scale(1.18)}.preset-dot.active{border-color:#fff;transform:scale(1.15)}.warnings{flex-direction:column;gap:6px;display:flex}.warning-item{background:var(--warning-bg);border:1px solid var(--warning-border);border-radius:6px;align-items:flex-start;gap:8px;padding:8px 10px;font-size:12px;line-height:1.4;display:flex}.warning-line{color:var(--warning);white-space:nowrap;min-width:32px;font-family:JetBrains Mono,monospace;font-size:11px;font-weight:600}.warning-message{color:var(--text-secondary)}.export-grid{grid-template-columns:1fr 1fr;gap:8px;display:grid}.btn{cursor:pointer;transition:all var(--transition);font-size:13px;font-weight:500;font-family:var(--font-sans);white-space:nowrap;border:1px solid #0000;border-radius:6px;justify-content:center;align-items:center;gap:6px;height:36px;padding:8px 12px;display:inline-flex}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background:var(--accent);color:#fff}.btn-primary:hover:not(:disabled){background:var(--accent-hover);box-shadow:var(--shadow)}.btn-secondary{background:var(--bg-tertiary);color:var(--text-primary);border-color:var(--border-color)}.btn-secondary:hover:not(:disabled){background:var(--bg-surface-hover);border-color:var(--text-muted)}.panel-right{background:var(--bg-primary);flex-direction:column;display:flex;overflow:hidden}.preview-header{border-bottom:1px solid var(--border-subtle);background:var(--bg-secondary);justify-content:space-between;align-items:center;padding:12px 20px;display:flex}.preview-title{color:var(--text-secondary);font-size:13px;font-weight:600}.preview-container{flex:1;justify-content:center;align-items:flex-start;padding:24px;display:flex;overflow:auto}.preview-svg-wrapper{border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);background:repeating-conic-gradient(#2d3748 0% 25%,#1a202c 0% 50%) 50%/16px 16px;max-width:100%;padding:12px;overflow:auto}.preview-svg-wrapper.bg-color{background:0 0}.preview-empty{color:var(--text-muted);text-align:center;flex-direction:column;justify-content:center;align-items:center;gap:12px;padding:60px 20px;display:flex}.preview-empty-icon{opacity:.3;font-size:48px}.preview-empty-text{font-size:14px}@media (width<=900px){.app-main{grid-template-columns:1fr}.panel-left{border-right:none;border-bottom:1px solid var(--border-subtle);max-height:none}.preview-container{min-height:300px}}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{background:var(--bg-tertiary);border-radius:4px}::-webkit-scrollbar-thumb:hover{background:var(--text-muted)}