:root{--color-bg:#0f0f0f;--color-text-primary:#e0e0e0;--color-text-secondary:#b8b8b8;--color-border:#4b4b4b;--color-surface:#181818;--color-button-bg:#eee;--color-button-text:#181818;color:var(--color-text-primary);background-color:var(--color-bg);font-synthesis:none;text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-family:system-ui,sans-serif;line-height:1.5}*{box-sizing:border-box}html,body,#root{margin:0;padding:0}h1,h2,p{margin:0}a{color:inherit}.container{flex-direction:column;gap:1rem;width:min(1000px,100%);min-height:100vh;margin:0 auto;padding:2rem 1.5rem;display:flex}.title{text-align:center;font-size:2rem;font-weight:700;line-height:1.2}.subtitle{text-align:center;font-size:clamp(.5rem,3vw,1rem);font-weight:400}.upload-zone{flex-direction:column;gap:1rem;display:flex}.upload-box{border:1px dashed var(--color-border);cursor:pointer;background:var(--color-surface);border-radius:10px;flex-direction:column;flex:1;justify-content:center;gap:.35rem;min-height:110px;padding:.9rem;display:flex}.upload-box:hover{filter:brightness(1.3)}.upload-input{display:none}.upload-label{font-weight:600}.upload-hint{color:var(--color-text-secondary);word-break:break-all;font-size:.9rem}.action-button{appearance:none;background:var(--color-button-bg);color:var(--color-button-text);text-align:center;cursor:pointer;border:0;border-radius:10px;padding:.75rem 1rem;font-family:inherit;font-size:.95rem;font-weight:600;text-decoration:none;display:block}.action-button:disabled{opacity:.5;cursor:not-allowed}.action-button:hover:not(:disabled){filter:brightness(.8)}.preview-area{aspect-ratio:16/9;border:1px solid var(--color-border);background:var(--color-surface);border-radius:10px;place-items:center;width:100%;display:grid;overflow:hidden}.preview-video{object-fit:contain;width:100%;height:100%}.preview-placeholder{color:var(--color-text-secondary);text-align:center;padding:1rem}@media (width>=900px){.upload-zone{flex-direction:row}}