.black-and-white-photo-generator-container{--bg-primary:#f5f5f0;--bg-secondary:#fff;--bg-section:#fff;--border-color:#333;--text-primary:#222;--text-secondary:#555;--text-light:#666;--color-accent:#3498db;--color-success:#27ae60;--color-warning:#f39c12;--color-danger:#e74c3c;--color-purple:#9b59b6;--shadow-sm:2px 2px 0 rgba(0,0,0,0.1);--shadow-md:4px 4px 0 rgba(0,0,0,0.15);--shadow-lg:8px 8px 0 rgba(0,0,0,0.15);--radius-container:8px;--radius-section:6px;--radius-button:4px;--radius-input:4px;--input-focus-bg:#fffacd;--preview-bg:#1a1a1a}.black-and-white-photo-generator-container.dark{--bg-primary:#1a1a1a;--bg-secondary:#2d2d2d;--bg-section:#2d2d2d;--border-color:#e0e0e0;--text-primary:#e8e8e8;--text-secondary:#b0b0b0;--text-light:#909090;--color-accent:#5dade2;--color-success:#52c77a;--color-warning:#f5b041;--color-danger:#ec7063;--color-purple:#af7ac5;--shadow-sm:2px 2px 0 rgba(255,255,255,0.08);--shadow-md:4px 4px 0 rgba(255,255,255,0.12);--shadow-lg:8px 8px 0 rgba(255,255,255,0.12);--input-focus-bg:#3a3a3a;--preview-bg:#111}@media (prefers-color-scheme:dark){.black-and-white-photo-generator-container:not(.dark):not(.light){--bg-primary:#1a1a1a;--bg-secondary:#2d2d2d;--bg-section:#2d2d2d;--border-color:#e0e0e0;--text-primary:#e8e8e8;--text-secondary:#b0b0b0;--text-light:#909090;--color-accent:#5dade2;--color-success:#52c77a;--color-warning:#f5b041;--color-danger:#ec7063;--color-purple:#af7ac5;--shadow-sm:2px 2px 0 rgba(255,255,255,0.08);--shadow-md:4px 4px 0 rgba(255,255,255,0.12);--shadow-lg:8px 8px 0 rgba(255,255,255,0.12);--input-focus-bg:#3a3a3a;--preview-bg:#111}}.black-and-white-photo-generator-container,.black-and-white-photo-generator-container *,.black-and-white-photo-generator-container *::before,.black-and-white-photo-generator-container *::after{box-sizing:border-box}.black-and-white-photo-generator-container{position:relative;max-width:1000px;width:100%;margin:8px auto;padding:8px;background:var(--bg-primary);border:2px solid var(--border-color);border-radius:var(--radius-container);font-family:-apple-system,BlinkMacSystemFont,'Segoe UI','Malgun Gothic',sans-serif;color:var(--text-primary);box-shadow:var(--shadow-lg);line-height:1.5}.dark-mode-toggle{position:absolute;top:10px;right:10px;padding:6px 10px;background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-button);cursor:pointer;transition:all 0.2s;box-shadow:var(--shadow-sm);font-size:15.5px;font-weight:600;color:var(--text-primary);z-index:10}.dark-mode-toggle:hover{transform:translate(.5px,.5px);box-shadow:1.5px 1.5px 0 rgba(0,0,0,.15)}.dark-mode-toggle:active{transform:translate(2px,2px);box-shadow:none}.header{margin-bottom:10px;padding-right:50px}.main-title{font-size:28px;font-weight:800;margin:0;color:var(--text-primary)}.subtitle{font-size:13.5px;color:var(--text-secondary);margin-top:4px}.main-grid{display:grid;grid-template-columns:380px 1fr;gap:8px;align-items:start}.input-section,.result-section{background:var(--bg-section);padding:8px;border:1px solid var(--border-color);border-radius:var(--radius-section);box-shadow:var(--shadow-md)}.result-section{display:flex;flex-direction:column;min-height:500px}.section-header{display:flex;align-items:center;gap:6px;margin-bottom:8px;padding-bottom:6px;border-bottom:1px solid var(--border-color);font-size:16px;font-weight:700;color:var(--text-primary)}.section-header svg{stroke:var(--color-accent);flex-shrink:0}.mt-12{margin-top:12px}.input-group{margin-bottom:8px}.upload-btn{width:100%;padding:14px;background:var(--bg-secondary);border:2px dashed var(--border-color);border-radius:var(--radius-input);color:var(--text-secondary);font-weight:600;font-size:15px;cursor:pointer;transition:all 0.2s;display:flex;align-items:center;justify-content:center;gap:8px}.upload-btn:hover{border-color:var(--color-accent);color:var(--color-accent);background:var(--input-focus-bg)}.upload-btn svg{stroke:currentColor}.filter-container{margin-bottom:8px}.filter-category{font-size:12px;font-weight:700;color:var(--text-secondary);margin-top:8px;margin-bottom:4px;text-transform:uppercase;letter-spacing:.5px}.filter-category:first-child{margin-top:0}.filter-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:5px;margin-bottom:4px}.filter-btn{padding:8px 4px;font-size:11.5px;background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-button);color:var(--text-primary);cursor:pointer;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;transition:all 0.15s;-webkit-user-select:none;user-select:none;-webkit-tap-highlight-color:rgba(52,152,219,.3)}.filter-btn:hover{background:var(--input-focus-bg);border-color:var(--color-accent)}.filter-btn:active{transform:scale(.97)}.filter-btn.active{background:var(--color-accent);color:#fff;border-color:var(--color-accent);font-weight:700;box-shadow:var(--shadow-sm)}.slider-row{display:flex;align-items:center;gap:8px;margin-bottom:8px}.slider-row:last-child{margin-bottom:0}.slider-row label{width:55px;font-size:13px;font-weight:600;color:var(--text-primary);flex-shrink:0}.slider-row input[type="range"]{flex:1;height:6px;background:#ddd;border-radius:3px;-webkit-appearance:none;cursor:pointer}.black-and-white-photo-generator-container.dark .slider-row input[type="range"]{background:#444}.slider-row input[type="range"]::-webkit-slider-thumb{-webkit-appearance:none;width:16px;height:16px;background:var(--color-accent);border:1px solid var(--border-color);border-radius:50%;cursor:pointer;transition:transform 0.1s}.slider-row input[type="range"]::-webkit-slider-thumb:hover{transform:scale(1.1)}.slider-row input[type="range"]::-moz-range-thumb{width:16px;height:16px;background:var(--color-accent);border:1px solid var(--border-color);border-radius:50%;cursor:pointer}.slider-value{width:32px;font-size:12px;font-weight:600;color:var(--text-secondary);text-align:right;font-family:'Courier New',monospace}.button-group{display:flex;gap:6px;margin-top:10px}.reset-btn{flex:1;padding:8px 10px;font-size:13.5px;font-weight:600;background:var(--color-warning);color:#fff;border:1px solid var(--border-color);border-radius:var(--radius-button);cursor:pointer;transition:all 0.15s;box-shadow:var(--shadow-sm);display:flex;align-items:center;justify-content:center;gap:6px}.reset-btn:hover{filter:brightness(1.05);transform:translate(.5px,.5px);box-shadow:1.5px 1.5px 0 rgba(0,0,0,.15)}.reset-btn:active{transform:translate(2px,2px);box-shadow:none}.reset-btn svg{stroke:currentColor}.preview-area{flex:1;min-height:350px;background:var(--preview-bg);border:1px solid var(--border-color);border-radius:var(--radius-section);display:flex;align-items:center;justify-content:center;position:relative;overflow:hidden}#photoCanvas{max-width:100%;max-height:100%;display:none}#photoCanvas.active{display:block}.empty-state{text-align:center;color:#888;padding:20px}.empty-state svg{stroke:#666;margin-bottom:12px;opacity:.6}.empty-state p{font-size:14px;line-height:1.6;margin:0}.empty-state.hidden{display:none}.filter-info{display:flex;flex-direction:column;gap:2px;padding:8px;margin-top:8px;background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-button)}.filter-name{font-size:14px;font-weight:700;color:var(--color-accent)}.filter-desc{font-size:12px;color:var(--text-secondary)}.download-btn{width:100%;padding:12px;margin-top:8px;background:var(--color-accent);color:#fff;border:1.5px solid var(--border-color);border-radius:var(--radius-button);font-size:15px;font-weight:700;cursor:pointer;transition:all 0.15s;box-shadow:4px 4px 0 rgba(0,0,0,.2);display:flex;align-items:center;justify-content:center;gap:8px}.download-btn:hover:not(:disabled){filter:brightness(1.05);transform:translate(1px,1px);box-shadow:3px 3px 0 rgba(0,0,0,.2)}.download-btn:active:not(:disabled){transform:translate(4px,4px);box-shadow:none}.download-btn:disabled{background:#888;cursor:not-allowed;box-shadow:none;opacity:.7}.download-btn svg{stroke:currentColor}.watermark{text-align:right;font-size:11px;color:var(--text-light);margin-top:6px;opacity:.7}.toast{position:fixed;bottom:20px;right:20px;background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-button);padding:12px 16px;box-shadow:var(--shadow-lg);opacity:0;transform:translateY(20px);transition:all 0.3s;z-index:1000;max-width:280px;font-size:13.5px;font-weight:600;color:var(--text-primary)}.toast.show{opacity:1;transform:translateY(0)}.toast.success{border-left:4px solid var(--color-success)}.toast.error{border-left:4px solid var(--color-danger)}@media (max-width:768px){.black-and-white-photo-generator-container{margin:6px 5px;padding:7px;width:calc(100% - 10px)}.main-grid{grid-template-columns:1fr;gap:6px}.input-section{order:2}.result-section{order:1;min-height:auto}.preview-area{min-height:300px}.main-title{font-size:24px}.section-header{font-size:15px}.dark-mode-toggle{font-size:14px;padding:5px 8px}.filter-grid{grid-template-columns:repeat(4,1fr)}}@media (max-width:480px){.black-and-white-photo-generator-container{padding:6px;border-width:1px}.input-section,.result-section{padding:6px}.main-title{font-size:22px}.subtitle{font-size:12.5px}.preview-area{min-height:250px}.filter-grid{grid-template-columns:repeat(3,1fr)}.filter-btn{font-size:11px;padding:7px 3px}}