:root{--bg-primary:#12100e;--bg-secondary:#181512;--bg-tertiary:#221d18;--bg-elevated:#28211c;--bg-hover:#2f261f;--bg-active:#3a2f25;--bg-overlay:#0a0806b8;--surface-1:#1a1613;--surface-2:#231d18;--surface-3:#2f2620;--border-subtle:#ffd6aa14;--border-default:#ffd6aa29;--border-strong:#ffbe7857;--border-focus:#e59b3a;--text-primary:#f4eadc;--text-secondary:#c8b8a3;--text-tertiary:#8d7b68;--text-inverse:#15120f;--accent-primary:#e59b3a;--accent-primary-hover:#f0b45d;--accent-primary-active:#c77a26;--accent-secondary:#9aa7b4;--accent-gradient:linear-gradient(135deg, #f0b35a, #d7822f);--accent-glow:0 0 26px #e59b3a3d;--color-success:#22c55e;--color-warning:#f59e0b;--color-error:#ef4444;--color-info:#3b82f6;--font-sans:"Noto Sans", "Noto Sans SC", "Segoe UI", sans-serif;--font-mono:"JetBrains Mono", "Consolas", "Fira Code", monospace;--text-xs:.6875rem;--text-sm:.75rem;--text-base:.8125rem;--text-md:.875rem;--text-lg:1rem;--text-xl:1.25rem;--text-2xl:1.5rem;--text-3xl:2rem;--sp-1:4px;--sp-2:8px;--sp-3:12px;--sp-4:16px;--sp-5:20px;--sp-6:24px;--sp-8:32px;--sp-10:40px;--sp-12:48px;--radius-sm:4px;--radius-md:8px;--radius-lg:12px;--radius-xl:16px;--radius-full:9999px;--shadow-sm:0 1px 2px #0000004d;--shadow-md:0 4px 12px #0006;--shadow-lg:0 8px 32px #00000080;--shadow-xl:0 16px 48px #0009;--transition-fast:.12s ease;--transition-base:.2s ease;--transition-slow:.35s ease;--z-canvas:1;--z-panel:10;--z-toolbar:20;--z-dropdown:30;--z-modal:40;--z-toast:50;--toolbar-height:48px;--sidebar-width:280px;--panel-min-width:220px;--bottom-bar-height:44px}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html{-webkit-text-size-adjust:100%;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-size:16px}body{font-family:var(--font-sans);font-size:var(--text-base);color:var(--text-primary);background:var(--bg-primary);touch-action:none;width:100vw;height:100vh;line-height:1.5;overflow:hidden}#app{flex-direction:column;width:100%;height:100%;display:flex}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{background:var(--border-strong);border-radius:var(--radius-full)}::-webkit-scrollbar-thumb:hover{background:var(--text-tertiary)}::selection{color:var(--text-primary);background:#a855f74d}.app-layout{flex-direction:column;width:100vw;height:100vh;display:flex;overflow:hidden}.toolbar{height:var(--toolbar-height);background:var(--bg-secondary);border-bottom:1px solid var(--border-subtle);padding:0 var(--sp-3);align-items:center;gap:var(--sp-2);z-index:var(--z-toolbar);flex-shrink:0;display:flex}.toolbar__brand{align-items:center;gap:var(--sp-2);padding-right:var(--sp-3);border-right:1px solid var(--border-subtle);margin-right:var(--sp-2);display:flex}.toolbar__brand-icon{width:24px;height:24px}.toolbar__brand-name{font-size:var(--text-md);background:var(--accent-gradient);-webkit-text-fill-color:transparent;letter-spacing:-.02em;-webkit-background-clip:text;background-clip:text;font-weight:700}.toolbar__group{align-items:center;gap:var(--sp-1);display:flex}.language-switcher{flex-wrap:wrap;justify-content:center;align-items:center;gap:6px;display:flex}.language-switcher__button{min-width:46px;margin-top:0!important}.toolbar__separator{background:var(--border-subtle);width:1px;height:24px;margin:0 var(--sp-2)}.main-content{flex:1;display:flex;position:relative;overflow:hidden}.sidebar{width:var(--sidebar-width);background:var(--bg-secondary);border-right:1px solid var(--border-subtle);z-index:var(--z-panel);transition:width var(--transition-base), transform var(--transition-base);flex-direction:column;flex-shrink:0;display:flex;overflow:hidden auto}.sidebar--collapsed{width:0;overflow:hidden}.sidebar__section{padding:var(--sp-3) var(--sp-3);border-bottom:1px solid var(--border-subtle)}.sidebar__section-title{font-size:var(--text-xs);color:var(--text-tertiary);text-transform:uppercase;letter-spacing:.08em;margin-bottom:var(--sp-2);font-weight:600}.canvas-viewport{background:repeating-conic-gradient(var(--bg-tertiary) 0% 25%, var(--bg-primary) 0% 50%) 50% / 20px 20px;flex:1;justify-content:center;align-items:center;display:flex;position:relative;overflow:hidden}.canvas-container{image-rendering:pixelated;image-rendering:crisp-edges;position:relative}.canvas-container canvas{image-rendering:pixelated;image-rendering:crisp-edges;display:block}.right-panel{width:var(--sidebar-width);background:var(--bg-secondary);border-left:1px solid var(--border-subtle);z-index:var(--z-panel);flex-direction:column;flex-shrink:0;display:flex;overflow-y:auto}.bottom-bar{height:var(--bottom-bar-height);background:var(--bg-secondary);border-top:1px solid var(--border-subtle);padding:0 var(--sp-3);align-items:center;gap:var(--sp-3);font-size:var(--text-xs);color:var(--text-tertiary);z-index:var(--z-toolbar);flex-shrink:0;display:flex}.bottom-bar__item{align-items:center;gap:var(--sp-1);display:flex}.bottom-bar__separator{background:var(--border-subtle);width:1px;height:16px}.btn{justify-content:center;align-items:center;gap:var(--sp-1);padding:var(--sp-1) var(--sp-2);border-radius:var(--radius-sm);font-family:var(--font-sans);font-size:var(--text-sm);color:var(--text-secondary);cursor:pointer;transition:all var(--transition-fast);white-space:nowrap;-webkit-user-select:none;user-select:none;background:0 0;border:1px solid #0000;min-width:32px;height:32px;font-weight:500;line-height:1;display:inline-flex}.btn svg{flex-shrink:0;width:16px;height:16px}.btn:hover{background:var(--bg-hover);color:var(--text-primary)}.btn:active{background:var(--bg-active)}.btn--active{box-shadow:var(--accent-glow);background:var(--accent-primary)!important;color:#fff!important}.btn--primary{background:var(--accent-gradient);color:#fff;border:none}.btn--primary:hover{opacity:.9;color:#fff}.btn--icon{padding:var(--sp-1);width:32px}.btn--icon svg{width:18px;height:18px}.btn--sm{min-width:28px;height:28px;padding:2px var(--sp-1);font-size:var(--text-xs)}.btn--sm svg{width:14px;height:14px}.input{height:32px;padding:0 var(--sp-2);background:var(--bg-primary);border:1px solid var(--border-default);border-radius:var(--radius-sm);color:var(--text-primary);font-family:var(--font-sans);font-size:var(--text-sm);transition:border-color var(--transition-fast);outline:none;width:100%}.input:focus{border-color:var(--border-focus);box-shadow:0 0 0 2px #a855f726}.input--sm{height:26px;font-size:var(--text-xs)}.label{font-size:var(--text-xs);color:var(--text-secondary);margin-bottom:var(--sp-1);justify-content:space-between;align-items:center;display:flex}.label__value{font-family:var(--font-mono);color:var(--text-primary);font-size:var(--text-xs)}.range-group{gap:var(--sp-1);flex-direction:column;display:flex}.range-slider{appearance:none;background:var(--bg-primary);border-radius:var(--radius-full);cursor:pointer;outline:none;width:100%;height:4px}.range-slider::-webkit-slider-thumb{appearance:none;background:var(--accent-primary);cursor:pointer;border:2px solid var(--bg-secondary);width:14px;height:14px;transition:transform var(--transition-fast);border-radius:50%;box-shadow:0 0 6px #a855f766}.range-slider::-webkit-slider-thumb:hover{transform:scale(1.2)}.range-slider::-moz-range-thumb{background:var(--accent-primary);cursor:pointer;border:2px solid var(--bg-secondary);border-radius:50%;width:14px;height:14px}.select{height:32px;padding:0 var(--sp-6) 0 var(--sp-2);background:var(--bg-primary);border:1px solid var(--border-default);border-radius:var(--radius-sm);color:var(--text-primary);font-family:var(--font-sans);font-size:var(--text-sm);cursor:pointer;appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%239a9ab0' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");background-position:right 8px center;background-repeat:no-repeat;outline:none;width:100%}.select:focus{border-color:var(--border-focus)}.select option{background:var(--bg-secondary);color:var(--text-primary)}.toggle{align-items:center;gap:var(--sp-2);cursor:pointer;-webkit-user-select:none;user-select:none;display:flex}.toggle__switch{background:var(--bg-primary);border:1px solid var(--border-default);border-radius:var(--radius-full);width:36px;height:20px;transition:background var(--transition-fast), border-color var(--transition-fast);flex-shrink:0;position:relative}.toggle__switch:after{content:"";background:var(--text-secondary);width:14px;height:14px;transition:transform var(--transition-fast), background var(--transition-fast);border-radius:50%;position:absolute;top:2px;left:2px}.toggle--active .toggle__switch{background:var(--accent-primary);border-color:var(--accent-primary)}.toggle--active .toggle__switch:after{background:#fff;transform:translate(16px)}.toggle__label{font-size:var(--text-sm);color:var(--text-secondary)}.color-swatch{border-radius:var(--radius-sm);border:2px solid var(--border-default);cursor:pointer;width:24px;height:24px;transition:transform var(--transition-fast), border-color var(--transition-fast);position:relative}.color-swatch:hover{border-color:var(--border-strong);transform:scale(1.15)}.color-swatch--active{border-color:var(--accent-primary);box-shadow:0 0 8px #a855f766}.color-swatch--large{width:32px;height:32px}.palette-grid{grid-template-columns:repeat(auto-fill,minmax(24px,1fr));gap:3px;display:grid}.tooltip{position:relative}.tooltip:after{content:attr(data-tooltip);background:var(--bg-elevated);color:var(--text-primary);font-size:var(--text-xs);border-radius:var(--radius-sm);white-space:nowrap;pointer-events:none;opacity:0;transition:opacity var(--transition-fast);border:1px solid var(--border-subtle);z-index:var(--z-dropdown);padding:4px 8px;position:absolute;bottom:100%;left:50%;transform:translate(-50%)translateY(-4px)}.tooltip:hover:after{opacity:1}.card{background:var(--surface-1);border:1px solid var(--border-subtle);border-radius:var(--radius-md);padding:var(--sp-4)}.upload-screen{justify-content:center;align-items:center;gap:var(--sp-4);z-index:var(--z-panel);background:var(--bg-primary);flex-direction:column;display:flex;position:absolute;inset:0}.upload-brand{align-items:center;gap:12px;margin-bottom:4px;display:flex}.upload-brand__icon{width:44px;height:44px;image-rendering:pixelated}.upload-brand__copy{flex-direction:column;gap:2px;display:flex}.upload-brand__name{color:var(--text-primary);font-family:var(--font-display);letter-spacing:.04em;font-size:28px;font-weight:900;line-height:1}.upload-brand__subtitle{color:var(--accent-primary);font-family:var(--font-mono);letter-spacing:.28em;text-transform:uppercase;font-size:10px;font-weight:700}.upload-tabs{background:#17120fd1;border:1px solid #ffc6801f;border-radius:12px;gap:8px;padding:6px;display:flex;box-shadow:0 14px 30px #00000029}.upload-tabs__tab{min-width:160px}.upload-zone{width:min(480px,90vw);padding:var(--sp-10);border:2px dashed var(--border-default);border-radius:var(--radius-xl);align-items:center;gap:var(--sp-4);text-align:center;cursor:pointer;transition:border-color var(--transition-base), background var(--transition-base);background:var(--surface-1);flex-direction:column;display:flex}.upload-zone:hover,.upload-zone--dragover{border-color:var(--accent-primary);background:#f6a9360f}.upload-zone--dragover{box-shadow:var(--accent-glow);border-style:solid}.upload-zone__icon{width:64px;height:64px;color:var(--text-tertiary);opacity:.6}.upload-zone__title{font-size:var(--text-xl);color:var(--text-primary);font-weight:700}.upload-zone__subtitle{font-size:var(--text-sm);color:var(--text-tertiary);max-width:280px}.upload-zone__formats{gap:var(--sp-2);flex-wrap:wrap;justify-content:center;display:flex}.upload-zone__format-tag{background:var(--bg-hover);border-radius:var(--radius-full);font-size:var(--text-xs);font-family:var(--font-mono);color:var(--text-secondary);padding:2px 8px}.drop-overlay{z-index:120;-webkit-backdrop-filter:blur(3px);backdrop-filter:blur(3px);pointer-events:none;background:#0a0806c7;justify-content:center;align-items:center;padding:20px;display:none;position:fixed;inset:0}.drop-overlay--visible{display:flex}.drop-overlay__panel{text-align:center;background:linear-gradient(#1f1a15eb,#120f0df5),repeating-conic-gradient(#4b463f 0% 25%,#36312c 0% 50%) 50%/20px 20px;border:3px dashed #ffbf66a8;border-radius:22px;flex-direction:column;justify-content:center;align-items:center;gap:16px;width:min(100%,960px);min-height:min(68vh,520px);padding:36px 24px;display:flex;box-shadow:inset 0 0 0 1px #ffd6aa14,0 28px 80px #00000061}.drop-overlay__icon{width:72px;height:72px;color:var(--accent-primary);opacity:.92}.drop-overlay__title{letter-spacing:.02em;color:var(--text-primary);font-size:clamp(1.125rem,2vw,1.75rem);font-weight:800}.drop-overlay__subtitle{max-width:560px;color:var(--text-secondary);font-size:var(--text-md)}.modal-overlay{background:var(--bg-overlay);z-index:var(--z-modal);animation:fadeIn var(--transition-base);justify-content:center;align-items:center;display:flex;position:fixed;inset:0}.modal{background:var(--bg-secondary);border:1px solid var(--border-default);border-radius:var(--radius-lg);box-shadow:var(--shadow-xl);width:100%;max-width:min(560px,90vw);max-height:80vh;animation:slideUp var(--transition-base);overflow-y:auto}.modal__header{padding:var(--sp-4) var(--sp-4) var(--sp-3);border-bottom:1px solid var(--border-subtle);justify-content:space-between;align-items:center;display:flex}.modal__title{font-size:var(--text-lg);font-weight:600}.modal__body{padding:var(--sp-4)}.modal__footer{padding:var(--sp-3) var(--sp-4);border-top:1px solid var(--border-subtle);justify-content:flex-end;gap:var(--sp-2);display:flex}.toast-container{top:var(--sp-4);right:var(--sp-4);z-index:var(--z-toast);gap:var(--sp-2);flex-direction:column;display:flex;position:fixed}.toast{align-items:center;gap:var(--sp-2);padding:var(--sp-3) var(--sp-4);background:var(--bg-elevated);border:1px solid var(--border-default);border-radius:var(--radius-md);box-shadow:var(--shadow-lg);font-size:var(--text-sm);animation:slideInRight var(--transition-base);max-width:340px;display:flex}.toast--success{border-left:3px solid var(--color-success)}.toast--error{border-left:3px solid var(--color-error)}.toast--warning{border-left:3px solid var(--color-warning)}.toast--info{border-left:3px solid var(--color-info)}.tool-panel{background:var(--bg-secondary);border-right:1px solid var(--border-subtle);width:44px;padding:var(--sp-2) 0;align-items:center;gap:var(--sp-1);z-index:var(--z-panel);flex-direction:column;flex-shrink:0;display:flex}.tool-panel .btn--icon{border-radius:var(--radius-md);width:36px;height:36px}.tool-panel .btn--icon svg{width:18px;height:18px}.spritesheet-preview-image{object-fit:contain;max-width:100%;max-height:min(62vh,720px);image-rendering:pixelated;image-rendering:crisp-edges;display:block;box-shadow:0 14px 30px #0000003d}.preview-frame__inner--spritesheet{position:relative}.spritesheet-stage-canvas-wrap{max-width:100%;max-height:100%;display:inline-flex;position:relative;overflow:auto}.spritesheet-stage-canvas,.spritesheet-stage-grid{image-rendering:pixelated;image-rendering:crisp-edges;display:block}.spritesheet-stage-grid{pointer-events:none;position:absolute;inset:0}.spritesheet-preview-shell{border-top:1px solid 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24px);border:1px solid #ffc1731f;border-radius:18px;min-width:0;box-shadow:inset 0 1px #ffd6aa0d}.preview-stage{flex-direction:column;gap:12px;width:min(100%,920px);display:flex}.preview-stage__header,.preview-stage__footer{background:linear-gradient(#231d18f0,#15120ff5);border:1px solid #ffc17324;border-radius:14px;justify-content:space-between;align-items:center;gap:12px;padding:12px 16px;display:flex;box-shadow:inset 0 1px #ffd6aa0d}.preview-stage__header-actions,.preview-zoom-controls{align-items:center;gap:8px;display:flex}.preview-zoom-label{min-width:44px;color:var(--accent-primary);text-align:center;font-size:11px;font-weight:800}.preview-stage__title{text-transform:uppercase;letter-spacing:.08em;color:#f7ead8;font-size:14px;font-weight:700}.preview-stage__subtitle{color:var(--text-tertiary);margin-top:3px;font-size:11px}.preview-stage__badge{color:#ffd9a5;letter-spacing:.18em;text-transform:uppercase;background:linear-gradient(#ffb75e2e,#ffb75e0f);border:1px solid #ffb75e42;border-radius:999px;padding:8px 12px;font-size:10px;font-weight:700}.preview-frame{background:linear-gradient(#2c241e,#1a1511);border:1px solid #ffc17329;border-radius:18px;padding:18px;position:relative;box-shadow:inset 0 1px #ffe4ba14,inset 0 0 0 1px #ffc1730d,0 18px 40px #00000047}.preview-frame:before,.preview-frame:after{content:"";pointer-events:none;border:1px solid #ffb35a1f;position:absolute;inset:14px}.preview-frame:after{background:linear-gradient(#e0a049,#e0a049) 0 0/18px 2px no-repeat,linear-gradient(#e0a049,#e0a049) 0 0/2px 18px no-repeat,linear-gradient(#e0a049,#e0a049) 100% 0/18px 2px no-repeat,linear-gradient(#e0a049,#e0a049) 100% 0/2px 18px no-repeat,linear-gradient(#e0a049,#e0a049) 0 100%/18px 2px no-repeat,linear-gradient(#e0a049,#e0a049) 0 100%/2px 18px no-repeat,linear-gradient(#e0a049,#e0a049) 100% 100%/18px 2px no-repeat,linear-gradient(#e0a049,#e0a049) 100% 100%/2px 18px no-repeat;border:0;inset:26px}.preview-frame__inner{background:linear-gradient(#110f0de0,#110f0deb),repeating-conic-gradient(#4b463f 0% 25%,#36312c 0% 50%) 50%/22px 22px;border-radius:12px;justify-content:center;align-items:center;min-height:clamp(360px,60vh,720px);padding:18px;display:flex;overflow:auto}#preview-canvas{box-shadow:0 14px 30px #0000004d}.preview-stage__footer{justify-content:flex-start;gap:10px}.preview-stage__metric:last-child{border-right:0}.preview-stage__metric-label{color:var(--text-tertiary);letter-spacing:.12em;margin-bottom:4px;font-size:10px;display:block}.preview-stage__metric-value{font-family:var(--font-mono);color:var(--text-primary);font-size:12px}.palette-grid--convert{grid-template-columns:repeat(auto-fill,minmax(28px,1fr));gap:6px}.convert-panel__eyebrow{color:var(--text-tertiary);margin-bottom:10px;font-size:11px}.convert-tool-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;display:grid}.convert-tool-grid__button{border-radius:10px;justify-content:flex-start;height:44px;padding:0 10px}.convert-tool-grid__button span{letter-spacing:.08em;text-transform:uppercase;font-size:11px}.info-list__row{border-bottom:1px solid #ffd6aa14;flex-direction:column;gap:4px;padding:8px 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