:root{--color-primary:#6366f1;--color-primary-dark:#4f46e5;--color-primary-light:#818cf8;--color-primary-bg:#eef2ff;--color-bg:#fff;--color-bg-alt:#f8fafc;--color-bg-card:#fff;--color-bg-raised:#f1f5f9;--color-text:#0f172a;--color-text-light:#64748b;--color-text-lighter:#94a3b8;--color-text-on-primary:#fff;--color-border:#e2e8f0;--color-border-hover:#6366f1;--color-border-focus:#818cf8;--color-success:#10b981;--color-success-bg:#ecfdf5;--color-error:#ef4444;--color-error-bg:#fef2f2;--color-warning:#f59e0b;--color-warning-bg:#fffbeb;--color-type-pdf:#ef4444;--color-type-image:#10b981;--color-type-video:#8b5cf6;--color-type-audio:#f59e0b;--color-type-doc:#3b82f6;--color-type-spreadsheet:#059669;--color-type-presentation:#f97316;--color-type-text:#6b7280;--color-type-generic:#9ca3af;--font-heading:"Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--font-body:"Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--font-mono:"JetBrains Mono", "Fira Code", 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#6366f14d;--z-base:0;--z-raised:10;--z-dropdown:100;--z-sticky:200;--z-overlay:300;--z-modal:400;--z-toast:500;--transition-fast:all .15s ease;--transition:all .2s ease;--transition-slow:all .35s ease;--nav-height:64px;--color-footer-bg:#0f172a;--color-footer-border:#1e293b;--color-footer-text:#94a3b8;--color-footer-muted:#64748b;--color-footer-dimmed:#4b5563;--color-footer-heading:#fff;--color-footer-dark-bg:#0b1120}[data-theme=dark]{--color-bg:#0f172a;--color-bg-alt:#1e293b;--color-bg-card:#1e293b;--color-bg-raised:#263548;--color-text:#f8fafc;--color-text-light:#94a3b8;--color-text-lighter:#64748b;--color-border:#334155;--color-border-hover:#818cf8;--color-border-focus:#6366f1;--color-primary:#818cf8;--color-primary-dark:#6366f1;--color-primary-light:#a5b4fc;--color-primary-bg:#1e1b4b;--color-success-bg:#064e3b;--color-error-bg:#450a0a;--color-warning-bg:#451a03;--shadow-sm:0 1px 3px #0000004d, 0 1px 2px #0003;--shadow:0 4px 8px #00000059, 0 1px 3px #00000040;--shadow-md:0 6px 16px #0006, 0 2px 6px #00000040;--shadow-lg:0 12px 28px #00000073, 0 4px 10px #0000004d;--shadow-primary:0 4px 14px #818cf84d}html{transition:background-color .3s,color .3s}*,:before,:after{box-sizing:border-box;margin:0;padding:0;transition:background-color .3s,border-color .3s}:focus-visible{outline:2px solid var(--color-primary);outline-offset:3px;border-radius:var(--radius-xs)}:focus:not(:focus-visible){outline:none}html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}body{font-family:var(--font-body);font-size:var(--text-base);color:var(--color-text);background-color:var(--color-bg);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;line-height:1.6;overflow-x:hidden}img,video,svg{max-width:100%;display:block}a{color:var(--color-primary);text-decoration:none;transition:color .15s}a:hover{color:var(--color-primary-dark)}button{cursor:pointer;background:0 0;border:none;font-family:inherit}ul,ol{list-style:none}h1,h2,h3,h4,h5,h6{font-family:var(--font-heading);color:var(--color-text);text-wrap:balance}p{max-width:68ch}.container{width:100%;max-width:var(--container-max);padding:0 var(--container-padding);margin:0 auto}.container-narrow{max-width:var(--container-narrow);padding:0 var(--container-padding);margin:0 auto}.section{padding:var(--section-padding) 0}.section-alt{background-color:var(--color-bg-alt)}.section-header{text-align:center;margin-bottom:var(--space-12)}.section-header h2{font-size:var(--text-h2);letter-spacing:-.03em;margin-bottom:var(--space-4);font-weight:800;line-height:1.2}.section-header p{font-size:var(--text-lg);color:var(--color-text-light);max-width:540px;margin:0 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0}.btn-ghost:hover{background:var(--color-primary-bg);border-color:var(--color-primary)}.btn-ghost:active{background:var(--color-primary-bg);transform:translateY(0)}.btn-download{background-color:var(--color-success);color:var(--color-text-on-primary)}.btn-download:hover{background-color:var(--color-type-spreadsheet);transform:translateY(-1px)}.btn-lg{font-size:var(--text-base);padding:.75rem 2rem;font-weight:600}.format-badge{border-radius:var(--radius-xs);height:20px;font-family:var(--font-mono);font-size:var(--text-badge);letter-spacing:.05em;text-transform:uppercase;color:var(--color-text-on-primary);white-space:nowrap;flex-shrink:0;justify-content:center;align-items:center;padding:0 6px;font-weight:600;line-height:1;display:inline-flex}.format-badge-sm{height:18px;padding:0 5px;font-size:.625rem}.format-badge-lg{height:26px;padding:0 8px;font-size:.75rem}.dropzone-wrapper{width:100%;max-width:var(--container-narrow);z-index:10;margin:0 auto;position:relative}.dropzone{background-color:var(--color-bg);border:2px dashed var(--color-border);border-radius:var(--radius-xl);cursor:pointer;flex-direction:column;justify-content:center;align-items:center;gap:8px;width:100%;min-height:220px;padding:40px 24px;transition:border-color .2s,background-color .2s,box-shadow .2s,transform .15s;display:flex;position:relative}.dropzone:hover,.dropzone:focus-within{border-color:var(--color-primary);background-color:var(--color-primary-bg);border-style:solid}.dropzone.dragover{border-color:var(--color-primary);background-color:var(--color-primary-bg);border-style:solid;transform:scale(1.01);box-shadow:0 0 0 4px #6366f11f}.dropzone.has-files{border-style:solid;border-color:var(--color-primary);min-height:auto;padding:20px 24px}.dropzone.processing{pointer-events:none;border-color:var(--color-primary);border-style:solid}.dropzone.success{border-color:var(--color-success);background-color:var(--color-success-bg);border-style:solid}.dropzone.error{border-color:var(--color-error);background-color:var(--color-error-bg);border-style:solid}.dropzone-empty{flex-direction:column;align-items:center;gap:8px;display:flex}.dropzone-icon{width:56px;height:56px;color:var(--color-primary);transition:transform .25s,color .2s;animation:3s ease-in-out infinite icon-float}@keyframes icon-float{0%,to{transform:translateY(0)}50%{transform:translateY(-6px)}}.dropzone-icon--active{color:var(--color-primary-dark);animation:none;transform:translateY(-8px)scale(1.1)!important}.dropzone:hover .dropzone-icon,.dropzone.dragover .dropzone-icon{animation:none;transform:translateY(-8px)scale(1.08)}.dropzone-heading{font-size:var(--text-lg);color:var(--color-text);margin:0;font-weight:700}.dropzone-heading--mobile{display:none}.dropzone-heading--desktop{display:inline}.dropzone-empty p{font-size:var(--text-sm);color:var(--color-text-light);text-align:center}.dropzone-formats-hint{font-size:var(--text-xs);color:var(--color-primary);background:var(--color-primary-bg);border-radius:var(--radius-full);border:1px solid #6366f133;margin-top:2px;padding:3px 12px;font-weight:500}.dropzone-hint{font-size:var(--text-xs);color:var(--color-text-lighter);margin-top:4px}.dropzone-browse-btn{color:var(--color-primary);font-size:inherit;cursor:pointer;text-underline-offset:2px;border-radius:var(--radius-sm);background:0 0;border:none;align-items:center;min-height:44px;margin:-2px -4px;padding:2px 4px;font-weight:600;text-decoration:underline;transition:color .15s,background .15s;display:inline-flex}.dropzone-browse-btn:hover{color:var(--color-primary-dark);background:var(--color-primary-bg)}.dropzone-browse-btn:focus-visible{outline:2px solid var(--color-primary);outline-offset:2px}.dropzone-files{flex-direction:column;gap:8px;width:100%;display:flex}.dropzone-file-item{background:var(--color-bg-alt);border:1px solid var(--color-border);border-radius:var(--radius);align-items:center;gap:10px;padding:10px 14px;animation:.2s forwards file-appear;display:flex}@keyframes file-appear{0%{opacity:0;transform:scale(.96)translateY(4px)}to{opacity:1;transform:scale(1)translateY(0)}}.file-name{font-family:var(--font-mono);font-size:var(--text-sm);color:var(--color-text);white-space:nowrap;text-overflow:ellipsis;flex:1;font-weight:500;overflow:hidden}.file-size{font-family:var(--font-mono);font-size:var(--text-xs);color:var(--color-text-lighter);white-space:nowrap}.file-remove{width:20px;height:20px;color:var(--color-text-lighter);transition:var(--transition-fast);border-radius:4px;justify-content:center;align-items:center;display:flex}.file-remove:hover{color:var(--color-error);background:var(--color-error-bg)}.icon-success{color:var(--color-success)}.icon-error{color:var(--color-error)}.format-selector{margin-top:var(--space-6);gap:var(--space-4);flex-direction:column;display:flex}.format-selector-row{align-items:center;gap:var(--space-4);display:flex}.format-from,.format-to{flex:1}.format-from label,.format-to label{font-size:var(--text-xs);color:var(--color-text-light);margin-bottom:var(--space-1);text-transform:uppercase;letter-spacing:.05em;font-weight:500;display:block}.format-display{background:var(--color-bg-alt);border:1px solid var(--color-border);border-radius:var(--radius);align-items:center;min-height:38px;padding:8px 12px;display:flex}.format-arrow{color:var(--color-text-lighter);margin-top:18px;font-size:1.25rem}.format-dropdown{position:relative}.format-search{border:1px solid var(--color-border);border-radius:var(--radius);width:100%;font-family:var(--font-body);font-size:var(--text-sm);background:var(--color-bg);color:var(--color-text);outline:none;min-height:44px;padding:9px 36px 9px 12px;transition:border-color .15s,box-shadow .15s}.format-search.has-value{border-color:var(--color-primary);color:var(--color-primary);font-weight:600}.format-search:focus{border-color:var(--color-primary);box-shadow:0 0 0 3px #6366f11f}.format-search::placeholder{color:var(--color-text-lighter);font-weight:400}.format-search-chevron{color:var(--color-text-lighter);pointer-events:none;transition:transform .2s,color .15s;position:absolute;top:50%;right:10px;transform:translateY(-50%)}.format-search-chevron.open{color:var(--color-primary);transform:translateY(-50%)rotate(180deg)}.format-options{background:var(--color-bg);border:1px solid var(--color-primary);border-radius:var(--radius);max-height:280px;box-shadow:var(--shadow-md);z-index:9999;flex-direction:column;padding:8px 0;display:flex;position:absolute;top:calc(100% + 4px);left:0;right:0;overflow:hidden auto}.format-options-group{padding:2px 0}.format-options-group+.format-options-group{border-top:1px solid var(--color-border)}.format-options-group-label{font-size:var(--text-xs);letter-spacing:.07em;text-transform:uppercase;padding:6px 12px 4px;font-weight:700}.format-options-group-items{flex-wrap:wrap;gap:4px;padding:2px 10px 8px;display:flex}.format-option{border-radius:var(--radius-sm);font-size:var(--text-xs);color:var(--color-text);background:var(--color-bg-alt);border:1px solid var(--color-border);cursor:pointer;transition:var(--transition-fast);white-space:nowrap;align-items:center;gap:5px;padding:5px 9px;font-weight:600;display:inline-flex}.format-option:hover{background:var(--color-primary-bg);border-color:var(--color-primary);color:var(--color-primary)}.format-option.selected{background:var(--color-primary-bg);border-color:var(--color-primary);color:var(--color-primary);font-weight:700}.convert-btn-wrapper{align-items:stretch;gap:var(--space-2);flex-direction:column;display:flex}.convert-btn{width:100%;min-height:52px;font-size:var(--text-base);letter-spacing:.01em;font-weight:700}.convert-btn:disabled{opacity:.45;cursor:not-allowed;box-shadow:none!important;transform:none!important}.convert-btn-hint{font-size:var(--text-xs);color:var(--color-text-lighter);text-align:center;margin:0}.advanced-toggle{align-items:center;gap:var(--space-2);padding:var(--space-2) var(--space-3);margin-top:var(--space-3);border:1px solid var(--color-border);border-radius:var(--radius-md);color:var(--color-text-light);font-size:var(--text-sm);cursor:pointer;background:0 0;width:fit-content;transition:color .15s,border-color .15s;display:inline-flex}.advanced-toggle svg{transition:transform .2s}.advanced-toggle.open svg{transform:rotate(180deg)}.advanced-toggle:hover{color:var(--color-primary);border-color:var(--color-primary)}.convert-options{background:var(--color-bg-alt);border:1px solid var(--color-border);border-radius:var(--radius-lg);padding:var(--space-4) var(--space-5);gap:var(--space-4);margin-top:var(--space-4);flex-direction:column;display:flex}.option-row{gap:var(--space-2);flex-direction:column;display:flex}.option-row-inline{flex-direction:row;align-items:center}.option-label{align-items:center;gap:var(--space-2);font-size:var(--text-sm);color:var(--color-text);font-weight:600;display:flex}.option-value{font-family:var(--font-mono);font-size:var(--text-xs);color:var(--color-primary);background:var(--color-primary-bg);border-radius:var(--radius-full);margin-left:auto;padding:2px 8px}.option-slider{-webkit-appearance:none;border-radius:var(--radius-full);background:linear-gradient(to right, var(--color-primary) 0%, var(--color-primary) var(--val,85%), var(--color-border) var(--val,85%));cursor:pointer;outline:none;width:100%;height:6px}.option-slider::-webkit-slider-thumb{-webkit-appearance:none;background:var(--color-primary);width:18px;height:18px;box-shadow:var(--shadow-sm);cursor:pointer;transition:var(--transition);border:2px solid #fff;border-radius:50%}.option-slider::-webkit-slider-thumb:hover{box-shadow:var(--shadow-primary);transform:scale(1.15)}.option-slider-labels{font-size:var(--text-xs);color:var(--color-text-lighter);justify-content:space-between;display:flex}.option-resize{align-items:center;gap:var(--space-3);flex-wrap:wrap;display:flex}.option-input{width:110px;padding:var(--space-2) var(--space-3);border:1px solid var(--color-border);border-radius:var(--radius);font-size:var(--text-sm);font-family:var(--font-mono);background:var(--color-bg);color:var(--color-text);transition:var(--transition)}.option-input:focus{border-color:var(--color-primary);outline:none;box-shadow:0 0 0 3px #6366f11f}.resize-x{color:var(--color-text-light);font-weight:500}.option-hint{font-size:var(--text-xs);color:var(--color-text-lighter);width:100%}.option-rotate{gap:var(--space-2);display:flex}.rotate-btn{padding:var(--space-2) var(--space-3);border:1px solid 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.2s;position:absolute;top:3px;left:3px}.option-toggle input:checked+.toggle-track .toggle-thumb{transform:translate(18px)}.option-select-group{gap:var(--space-2);flex-wrap:wrap;display:flex}.select-btn{padding:var(--space-1) var(--space-3);border:1px solid var(--color-border);border-radius:var(--radius-full);font-size:var(--text-xs);background:var(--color-bg);color:var(--color-text-light);cursor:pointer;transition:var(--transition);font-weight:500;font-family:var(--font-mono)}.select-btn:hover{border-color:var(--color-primary);color:var(--color-primary)}.select-btn.active{background:var(--color-primary);border-color:var(--color-primary);color:#fff}.download-all-btn{align-items:center;gap:var(--space-2);justify-content:center;width:100%;min-height:48px;display:flex}.convert-more-btn{width:100%;min-height:44px}.result-name{font-family:var(--font-mono);font-size:var(--text-sm);white-space:nowrap;text-overflow:ellipsis;max-width:300px;overflow:hidden}.conversion-progress{margin-top:var(--space-6)}.progress-header{margin-bottom:var(--space-2);justify-content:space-between;align-items:center;display:flex}.progress-label{align-items:center;gap:var(--space-2);font-family:var(--font-mono);font-size:var(--text-xs);color:var(--color-text-light);display:flex}.progress-pct{font-family:var(--font-mono);font-size:var(--text-xs);color:var(--color-primary);font-weight:600}.progress-bar{background:var(--color-border);border-radius:var(--radius-full);width:100%;height:8px;overflow:hidden}.progress-fill{background:linear-gradient(90deg, var(--color-primary), var(--color-primary-light));border-radius:var(--radius-full);height:100%;transition:width .35s ease-in-out}.spin{animation:1s linear infinite spin}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.conversion-results{margin-top:var(--space-6);gap:var(--space-3);flex-direction:column;display:flex}.results-success-banner,.results-error-banner{align-items:center;gap:var(--space-3);padding:var(--space-3) var(--space-4);border-radius:var(--radius);font-size:var(--text-sm);font-weight:600;animation:.3s forwards banner-pop;display:flex}@keyframes banner-pop{0%{opacity:0;transform:translateY(-6px)scale(.98)}to{opacity:1;transform:translateY(0)scale(1)}}.results-success-banner{background:var(--color-success-bg);border:1px solid var(--color-success);color:var(--color-success)}.results-error-banner{background:var(--color-error-bg);border:1px solid var(--color-error);color:var(--color-error)}.result-item{justify-content:space-between;align-items:center;gap:var(--space-3);padding:var(--space-3) var(--space-4);border-radius:var(--radius);border:1px solid var(--color-border);background:var(--color-bg);display:flex}.result-item.success{border-color:var(--color-success);background:var(--color-success-bg)}.result-item.error{border-color:var(--color-error);background:var(--color-error-bg)}.result-info{align-items:center;gap:var(--space-2);flex:1;min-width:0;display:flex}.result-info 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