*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:#fff;color:#1a1a1a;line-height:1.6}a{color:inherit;text-decoration:none}.app{min-height:100vh;display:flex;flex-direction:column}.header{background:#fff;border-bottom:1px solid #e5e5e5;position:sticky;top:0;width:100%}.inner{display:flex;justify-content:space-between;align-items:center;padding:12px 0;width:100%}.logo{font-weight:600;font-size:1.1rem}.nav{display:flex;gap:16px}.nav a{color:#666;font-size:.9rem;text-decoration:none}.nav a:hover{color:#1a1a1a}.container{max-width:900px;margin:0 auto;padding:60px 24px 100px;flex:1}.hero{text-align:center;margin-bottom:48px}.hero h1{font-size:2rem;font-weight:600;margin-bottom:8px}.hero p{color:#666}.download-count{color:#999;font-size:.85rem;margin-top:8px}.container{max-width:900px;margin:0 auto;padding:60px 24px;flex:1}.tool{display:block;background:#fff;border:1px solid #e5e5e5;border-radius:12px;padding:32px 24px}.input-wrap{display:flex;gap:12px;flex-wrap:wrap}.url-input{flex:1;min-width:0;padding:14px 18px;border:1px solid #e5e5e5;border-radius:8px;font-size:1rem;outline:none;transition:border-color .2s}.url-input:focus{border-color:#1a1a1a}.submit-btn{display:block;width:100%;padding:14px 24px;border:none;background:#000;color:#fff;border-radius:8px;font-size:1rem;cursor:pointer;white-space:nowrap}.submit-btn:disabled{background:#000;cursor:not-allowed}@media (min-width: 500px){.input-wrap{flex-wrap:nowrap}.url-input{min-width:200px}}.tool{display:block;background:#fff;border:1px solid #e5e5e5;border-radius:12px;padding:32px 24px;margin-bottom:32px}.error-msg{margin-top:16px;padding:12px;background:#fef2f2;color:#dc2626;border-radius:8px;font-size:.9rem}.video-card{margin-top:20px;padding:16px;background:#f5f5f5;border-radius:8px;overflow:hidden}.video-card h3{font-size:.95rem;font-weight:500;margin-bottom:4px;overflow:hidden;text-overflow:ellipsis;display:-webkit-box;-webkit-line-clamp:1;-webkit-box-orient:vertical;word-break:break-all}@media (max-width: 500px){.video-card h3{font-size:.85rem}}.video-card p{font-size:.8rem;color:#666}.action-wrap{margin-top:16px}.result-box{margin-top:20px;padding:16px;background:#f0fdf4;border-radius:8px;overflow:hidden}.result-title{font-weight:500;margin-bottom:2px;overflow:hidden;text-overflow:ellipsis;display:-webkit-box;-webkit-line-clamp:1;-webkit-box-orient:vertical;word-break:break-all}.result-title{font-weight:500;margin-bottom:2px}.result-size{font-size:.85rem;color:#666}.expire-tip{font-size:.75rem;color:#f59e0b;margin-top:4px}.files-section{margin-top:32px}.files-title{font-size:1rem;font-weight:600;margin-bottom:16px}.file-item{padding:16px;background:#f5f5f5;border-radius:8px;margin-bottom:12px}.file-info{margin-bottom:12px}.file-name{font-size:.9rem;font-weight:500;overflow:hidden;text-overflow:ellipsis;display:-webkit-box;-webkit-line-clamp:1;-webkit-box-orient:vertical;word-break:break-all}.file-meta{font-size:.75rem;color:#666}.file-actions{display:flex;gap:8px;justify-content:flex-end}.icon-btn{display:flex;align-items:center;justify-content:center;width:36px;height:36px;padding:0;border:1px solid #e5e5e5;background:#fff;border-radius:6px;cursor:pointer}.icon-btn:hover{border-color:#1a1a1a}.icon-btn svg{width:18px;height:18px;color:#000}.file-item{display:flex;align-items:center;justify-content:space-between;padding:16px;background:#f5f5f5;border-radius:8px;margin-bottom:12px;flex-wrap:wrap;gap:12px}.file-info{flex:1;min-width:150px}.footer{position:fixed;bottom:0;left:0;right:0;text-align:center;padding:8px 24px;background:#fff;color:#666;font-size:.8rem}.footer a{color:#000;font-weight:600}@media (max-width: 600px){.container{padding:48px 16px}}.modal-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:#00000080;display:flex;align-items:center;justify-content:center;z-index:1000}.modal{background:#fff;border-radius:12px;padding:24px;width:90%;max-width:360px;text-align:center}.modal h3{margin-bottom:12px;font-size:1.1rem}.modal p{color:#666;font-size:.9rem;margin-bottom:16px}.invite-input{width:100%;padding:12px;border:1px solid #e5e5e5;border-radius:8px;font-size:1rem;text-align:center;margin-bottom:12px;box-sizing:border-box}.invite-input:focus{outline:none;border-color:#000}.invite-error{color:#dc2626;font-size:.85rem;margin-bottom:12px}.invite-btn{width:100%;padding:12px;border:none;background:#000;color:#fff;border-radius:8px;font-size:1rem;cursor:pointer}