:root{--bg-dark: #0a0a0a;--bg-panel: #161616;--accent: #3b82f6;--accent-glow: rgba(59, 130, 246, .5);--text-main: #ffffff;--text-muted: #a1a1aa;--border: #27272a;font-family:Inter,system-ui,Avenir,Helvetica,Arial,sans-serif;line-height:1.5;font-weight:400;color-scheme:dark;color:var(--text-main);background-color:var(--bg-dark);font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{margin:0;display:flex;place-items:center;min-width:320px;min-height:100vh;background:radial-gradient(circle at 50% 0%,#1a1a2e 0%,var(--bg-dark) 100%)}#root{width:100%;max-width:1280px;margin:0 auto;padding:2rem;text-align:center}button{border-radius:8px;border:1px solid transparent;padding:.6em 1.2em;font-size:1em;font-weight:500;font-family:inherit;background-color:#1a1a1a;cursor:pointer;transition:border-color .25s}button:hover{border-color:#646cff}button:focus,button:focus-visible{outline:4px auto -webkit-focus-ring-color}.app-container{display:flex;flex-direction:column;gap:2rem;width:100%;max-width:1000px;margin:0 auto}header h1{font-size:2.5rem;font-weight:700;margin-bottom:.5rem;background:linear-gradient(to right,#fff,#a1a1aa);-webkit-background-clip:text;-webkit-text-fill-color:transparent}header p{color:var(--text-muted)}.donation-btn{position:fixed;top:20px;right:20px;background:#ff5e5b;color:#fff;padding:.6rem 1.2rem;border-radius:25px;text-decoration:none;font-weight:600;font-size:.9rem;box-shadow:0 4px 12px #ff5e5b4d;transition:all .2s;z-index:1000}.donation-btn:hover{transform:translateY(-2px);box-shadow:0 6px 16px #ff5e5b80}footer{margin-top:3rem;padding:2rem;border-top:1px solid var(--border);text-align:center}.premium-cta{background:linear-gradient(135deg,#667eea,#764ba2);padding:2rem;border-radius:16px;margin-bottom:1.5rem}.premium-cta h3{margin:0 0 .5rem;font-size:1.3rem}.premium-cta p{margin:0 0 1rem;opacity:.9}.premium-btn{background:#fff;color:#667eea;padding:.8rem 2rem;border-radius:8px;text-decoration:none;font-weight:700;display:inline-block;transition:all .2s}.premium-btn:hover{transform:scale(1.05);box-shadow:0 4px 12px #ffffff4d}.footer-links{color:var(--text-muted);font-size:.9rem}.mode-switch{display:flex;justify-content:center;gap:1rem;margin:1rem 0}.mode-switch button{background:transparent;border:1px solid var(--border);color:var(--text-muted);padding:.5rem 1.5rem;border-radius:20px}.mode-switch button.active{background:var(--accent);color:#fff;border-color:var(--accent);box-shadow:0 0 10px var(--accent-glow)}main{display:grid;grid-template-columns:1fr 1fr;gap:2rem;align-items:start}.channels-grid{display:grid;grid-template-columns:1fr 1fr;gap:1rem}.dropzone{background:var(--bg-panel);border:2px dashed var(--border);border-radius:12px;aspect-ratio:1;display:flex;flex-direction:column;align-items:center;justify-content:center;cursor:pointer;transition:all .2s ease;position:relative;overflow:hidden}.dropzone:hover{border-color:var(--accent);background:#3b82f60d}.dropzone.filled{border-style:solid;border-color:var(--accent)}.channel-label{position:absolute;top:10px;left:10px;font-weight:700;font-size:.9rem;z-index:10;text-shadow:0 2px 4px rgba(0,0,0,.8);display:flex;flex-direction:column;align-items:flex-start}.channel-label .hint{font-size:.7rem;font-weight:400;opacity:.8}.channel-r .channel-label{color:#f55}.channel-g .channel-label{color:#5f5}.channel-b .channel-label{color:#55f}.channel-a .channel-label{color:#fff}.placeholder{font-size:3rem;color:var(--border);transition:color .2s}.dropzone:hover .placeholder{color:var(--accent)}.preview-thumb{width:100%;height:100%;position:absolute;top:0;left:0}.preview-thumb img{width:100%;height:100%;object-fit:cover;opacity:.5}.remove-btn{position:absolute;top:5px;right:5px;background:#00000080;border:none;color:#fff;width:24px;height:24px;border-radius:50%;display:flex;align-items:center;justify-content:center;padding:0;font-size:1.2rem;line-height:1}.remove-btn:hover{background:#ff3232cc}.preview-section{background:var(--bg-panel);padding:1.5rem;border-radius:16px;border:1px solid var(--border);display:flex;flex-direction:column;gap:1.5rem}.preview-container{width:100%;aspect-ratio:1;background:#000;border-radius:8px;overflow:hidden;display:flex;align-items:center;justify-content:center;background-image:linear-gradient(45deg,#1a1a1a 25%,transparent 25%),linear-gradient(-45deg,#1a1a1a 25%,transparent 25%),linear-gradient(45deg,transparent 75%,#1a1a1a 75%),linear-gradient(-45deg,transparent 75%,#1a1a1a 75%);background-size:20px 20px;background-position:0 0,0 10px,10px -10px,-10px 0px}.main-preview{max-width:100%;max-height:100%;object-fit:contain}.preview-placeholder{color:var(--text-muted)}.download-btn{background:var(--accent);color:#fff;font-weight:600;padding:1rem;border-radius:8px;box-shadow:0 4px 12px var(--accent-glow)}.download-btn:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 6px 16px var(--accent-glow)}.download-btn:disabled{background:var(--border);color:var(--text-muted);cursor:not-allowed;box-shadow:none}.split-input-section{display:flex;flex-direction:column;gap:1rem}.main-dropzone{aspect-ratio:16/9}.split-results-grid{display:grid;grid-template-rows:repeat(3,1fr);gap:1rem}.split-result-card{background:var(--bg-panel);border:1px solid var(--border);border-radius:8px;padding:.5rem;display:flex;align-items:center;gap:1rem}.channel-header{font-weight:700;width:80px;text-align:right;font-size:.8rem}.result-preview{width:60px;height:60px;background:#000;border-radius:4px;overflow:hidden;flex-shrink:0}.result-preview img{width:100%;height:100%;object-fit:cover}.empty-state{width:100%;height:100%;display:flex;align-items:center;justify-content:center;font-size:.6rem;color:var(--text-muted);text-align:center}.download-mini-btn{margin-left:auto;font-size:.8rem;padding:.4rem .8rem}@media(max-width:768px){main{grid-template-columns:1fr}}