:root{--bg-color: #0f0f0f;--text-color: #ffffff;--card-radius: 12px;--grid-gap: 16px;--card-aspect-ratio: 3 / 4}body{margin:0;font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Open Sans,Helvetica Neue,sans-serif;background-color:var(--bg-color);color:var(--text-color);-webkit-font-smoothing:antialiased}#root{width:100%;min-height:100vh;display:flex;justify-content:center}.app-container{width:100%;max-width:480px;padding:20px;box-sizing:border-box}.page-title{font-size:24px;font-weight:700;margin-bottom:24px;margin-top:10px}.material-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--grid-gap);padding-bottom:40px}.element-container{position:relative;width:100%;aspect-ratio:var(--card-aspect-ratio);display:flex;align-items:center;justify-content:center}.element-card{width:100%;height:100%;border-radius:8px;box-shadow:0 1px 3px #0003;transition:transform .2s ease;box-sizing:border-box;overflow:hidden}.element-cover{width:100%;height:100%;object-fit:cover;display:block}.element-card.single,.element-container.stack{position:relative}.stack-card{position:absolute;top:0;left:0;width:100%;height:100%;border-radius:8px;box-shadow:0 1px 2px #0000004d;box-sizing:border-box;overflow:hidden}.stack-card.top{box-shadow:0 4px 8px #0000004d}.stack-count-badge{position:absolute;top:8px;right:8px;background-color:#0009;color:#fff;font-size:12px;font-weight:600;padding:2px 6px;border-radius:4px;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}.header-bar{display:flex;justify-content:space-between;align-items:center;padding:10px 0 20px;height:44px}.icon-button{background:none;border:none;padding:8px;cursor:pointer;display:flex;align-items:center;justify-content:center}.icon-button img{width:24px;height:24px;filter:invert(1)}.text-button{background:none;border:none;color:var(--text-color);font-size:16px;font-weight:600;cursor:pointer;padding:8px 16px}.spacer{width:40px}.material-grid.grid-cols-1{grid-template-columns:1fr}.material-grid.grid-cols-3{grid-template-columns:repeat(3,1fr)}.material-grid.grid-cols-5{grid-template-columns:repeat(5,1fr)}.menu-overlay{position:fixed;top:0;left:0;width:100vw;height:100vh;z-index:40;background:transparent}.menu-dropdown{position:absolute;top:100%;left:10px;background-color:#1c1c1e;border-radius:12px;padding:8px 0;min-width:160px;box-shadow:0 4px 20px #00000080;z-index:50;border:1px solid #38383a}.menu-item{padding:12px 16px;font-size:16px;color:var(--text-color);cursor:pointer;transition:background-color .2s}.menu-item:hover{background-color:#2c2c2e}.menu-item:active{background-color:#3a3a3c}.selection-indicator{position:absolute;top:8px;left:8px;width:20px;height:20px;border-radius:50%;border:2px solid rgba(255,255,255,.8);background-color:#0003;display:flex;align-items:center;justify-content:center;z-index:10}.selection-indicator.selected{background-color:#007aff;border-color:#007aff}.selection-check{color:#fff;font-size:12px;font-weight:700}.bottom-action-bar{position:fixed;bottom:0;left:50%;transform:translate(-50%);width:100%;max-width:480px;background-color:#1c1c1e;border-top:1px solid #38383a;padding:16px 20px;display:flex;justify-content:space-between;align-items:center;box-sizing:border-box;z-index:100;padding-bottom:max(16px,env(safe-area-inset-bottom))}.selection-count{font-size:16px;font-weight:600}.delete-button{background:none;border:none;color:#ff453a;font-size:16px;font-weight:600;cursor:pointer}.delete-button.disabled{color:#636366;cursor:default}.modal-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background-color:#00000080;display:flex;align-items:center;justify-content:center;z-index:200;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px)}.modal-content{background-color:#1c1c1e;border-radius:14px;padding:20px;width:80%;max-width:320px;text-align:center}.modal-content h3{margin:0 0 10px;font-size:18px}.modal-content p{margin:0 0 20px;font-size:14px;color:#aeaeb2;line-height:1.4}.modal-actions{display:flex;justify-content:space-around}.modal-actions button{background:none;border:none;font-size:16px;cursor:pointer;padding:10px 20px;color:#007aff}.modal-actions button.confirm-delete{color:#ff453a;font-weight:600}.player-page{display:flex;flex-direction:column;height:100vh;background-color:#000;position:fixed;top:0;left:0;width:100%;z-index:200}.player-header{padding:16px;display:flex;align-items:center;position:absolute;top:0;left:0;width:100%;z-index:10;background:linear-gradient(to bottom,rgba(0,0,0,.5),transparent)}.back-button{background:none;border:none;color:#fff;font-size:16px;cursor:pointer;display:flex;align-items:center;padding:8px;text-shadow:0 1px 2px rgba(0,0,0,.5)}.video-player-container{flex:1;display:flex;align-items:center;justify-content:center;width:100%}.video-placeholder{width:100%;aspect-ratio:9 / 16;max-height:100vh;display:flex;align-items:center;justify-content:center}.play-icon{font-size:64px;color:#fffc;text-shadow:0 2px 10px rgba(0,0,0,.5)}.control-buttons button{background:none;border:none;color:#fff;font-size:24px;cursor:pointer;padding:0;opacity:.9}.control-buttons button:active{opacity:.7}.stack-detail-page{display:flex;flex-direction:column;height:100vh;background-color:var(--bg-color);position:fixed;top:0;left:0;width:100%;z-index:100;overflow-y:auto}.header-title{font-size:17px;font-weight:600;color:var(--text-color)}.stack-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:2px;padding:0}.stack-item{aspect-ratio:3 / 4;cursor:pointer;position:relative}.stack-item.featured{grid-column:1 / -1;aspect-ratio:9 / 16;width:60%;margin:0 auto 16px;border-radius:16px;overflow:hidden}.video-thumbnail{width:100%;height:100%;background-color:#333;transition:opacity .2s}.stack-item:active .video-thumbnail{opacity:.8}.score-badge{position:absolute;bottom:8px;right:8px;background-color:#0009;color:#fff;font-size:12px;font-weight:600;padding:2px 6px;border-radius:4px;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}.quality-tags{position:absolute;top:8px;right:8px;display:flex;flex-direction:column;gap:4px;align-items:flex-end}.quality-tag{background-color:#ff453acc;color:#fff;font-size:10px;padding:2px 6px;border-radius:4px;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);white-space:nowrap;font-weight:500}.ai-recommend-tag{position:absolute;top:8px;left:8px;background-color:#0009;color:#fff;font-size:10px;font-weight:600;padding:3px 4px;border-radius:4px;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);display:flex;align-items:center;z-index:10}