:root{--font-sans: "DM Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--font-mono: "JetBrains Mono", "SF Mono", "Menlo", "Cascadia Code", monospace;--bg: #FAFAFA;--bg-surface: #FFFFFF;--bg-subtle: #F1F5F9;--text-primary: #0F172A;--text-secondary: #64748B;--text-tertiary: #94A3B8;--text-on-accent: #FFFFFF;--border: #E2E8F0;--border-light: #F1F5F9;--accent: #2563EB;--accent-hover: #1D4ED8;--accent-light: #EFF6FF;--accent-muted: #DBEAFE;--danger: #EF4444;--danger-bg: #FEF2F2;--radius-xl: 20px;--radius-lg: 14px;--radius-md: 10px;--radius-sm: 6px;--shadow-sm: 0 1px 2px rgba(0,0,0,.04);--shadow-md: 0 4px 12px rgba(0,0,0,.06);--shadow-lg: 0 8px 30px rgba(0,0,0,.08);--transition: .18s ease;--transition-slow: .3s ease}*,*:before,*:after{box-sizing:border-box}body{margin:0;font-family:var(--font-sans);background-color:var(--bg);color:var(--text-primary);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation-duration:.01ms!important;transition-duration:.01ms!important}}.initial-view{display:flex}.chat-view{display:flex;flex-direction:row;height:100vh;animation:viewFadeIn .25s ease forwards}.chat-main{display:flex;flex-direction:column;flex:1;min-width:0}@keyframes viewFadeIn{0%{opacity:0}to{opacity:1}}.language-switcher{background:var(--bg-surface);border:1px solid var(--border);border-radius:var(--radius-sm);padding:2px;display:flex}.language-switcher button{border:none;background-color:transparent;padding:4px 12px;font-size:.8rem;font-weight:500;border-radius:4px;cursor:pointer;color:var(--text-tertiary);transition:all var(--transition)}.language-switcher button.active{background-color:var(--text-primary);color:var(--text-on-accent)}button:disabled{opacity:.4;cursor:not-allowed}.top-bar{position:fixed;top:0;right:0;display:flex;align-items:center;gap:10px;padding:1rem 1.5rem;z-index:100}.top-bar .language-switcher{position:static}.auth-area{display:flex;align-items:center}.auth-buttons{display:flex;gap:6px}.auth-btn{padding:6px 14px;border-radius:var(--radius-sm);font-size:.82rem;font-weight:500;border:1px solid var(--border);background:var(--bg-surface);color:var(--text-primary);cursor:pointer;transition:all var(--transition)}.auth-btn:hover{background:var(--bg-subtle);border-color:var(--text-tertiary)}.auth-btn-primary{background:var(--text-primary);color:var(--text-on-accent);border-color:var(--text-primary)}.auth-btn-primary:hover{background:#1e293b}.auth-btn-sm{padding:4px 10px;font-size:.78rem}.user-info{display:flex;align-items:center;gap:8px;font-size:.82rem;color:var(--text-primary)}.user-info span{font-weight:500}.initial-view{min-height:100vh;flex-direction:row;position:relative;background:var(--bg)}#logo-initial{position:absolute;top:2.5rem;left:2.5rem}.initial-content{display:flex;flex-direction:column;justify-content:center;align-items:center;flex:1;min-width:0;padding:2rem 2rem 4rem;text-align:center}.hero-group{text-align:center;max-width:580px;width:100%;animation:heroEnter .5s ease forwards}@keyframes heroEnter{0%{opacity:0;transform:translateY(16px)}to{opacity:1;transform:translateY(0)}}.hero-group h1{font-size:clamp(1.6rem,4vw,2.2rem);font-weight:600;line-height:1.35;margin:0 0 .5rem;color:var(--text-primary);letter-spacing:-.02em}.hero-subtitle{font-size:.95rem;color:var(--text-secondary);margin:0 0 2rem;font-weight:400;line-height:1.5}.initial-form{position:relative}.initial-form input{width:100%;height:54px;padding:0 54px 0 20px;border:1px solid var(--border);border-radius:var(--radius-lg);background-color:var(--bg-surface);font-size:.95rem;color:var(--text-primary);box-sizing:border-box;box-shadow:var(--shadow-sm);transition:border-color var(--transition),box-shadow var(--transition)}.initial-form input:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px #2563eb14}#initial-input::placeholder{font-weight:400;color:var(--text-tertiary)}.initial-form button{position:absolute;right:7px;top:50%;transform:translateY(-50%);width:40px;height:40px;background:var(--accent);border:none;border-radius:50%;color:var(--text-on-accent);cursor:pointer;display:grid;place-items:center;transition:background-color var(--transition),transform var(--transition)}.initial-form button:hover{background-color:var(--accent-hover);transform:translateY(-50%) scale(1.05)}.initial-footer{margin-top:2.5rem;display:flex;align-items:center;gap:1rem;font-size:.85rem;font-weight:500}.initial-footer a{color:var(--text-secondary);text-decoration:none;transition:color var(--transition)}.initial-footer a:hover{color:var(--accent)}.initial-footer span{color:var(--border)}.chat-header{padding:0 1.25rem;height:52px;border-bottom:1px solid var(--border);background:var(--bg-surface);display:flex;align-items:center;justify-content:space-between;flex-shrink:0}.header-left{display:flex;align-items:center;gap:4px}.header-right{display:flex;align-items:center;gap:10px}.header-icon-btn{background:none;border:none;color:var(--text-tertiary);cursor:pointer;padding:6px;border-radius:var(--radius-sm);display:grid;place-items:center;transition:background var(--transition),color var(--transition)}.header-icon-btn:hover{background:var(--bg-subtle);color:var(--text-primary)}.header-divider,.chat-brand,#logo-chat{display:none}.new-chat-button{background:transparent;color:var(--text-secondary);border:1px solid var(--border);border-radius:var(--radius-sm);padding:5px 12px;display:inline-flex;align-items:center;gap:5px;font-size:.82rem;font-weight:500;cursor:pointer;transition:all var(--transition)}.new-chat-button:hover{background:var(--bg-subtle);color:var(--text-primary);border-color:var(--text-tertiary)}.chat-log{flex-grow:1;overflow-y:auto;padding:1.5rem;display:flex;flex-direction:column;gap:1.25rem;background-color:var(--bg)}.chat-footer{padding:.75rem 1.25rem 1rem;flex-shrink:0;background:var(--bg);border-top:1px solid var(--border-light)}.input-container{position:relative;max-width:800px;margin:0 auto;width:100%}.input-container input{width:100%;height:46px;padding:0 46px 0 16px;border:1px solid var(--border);border-radius:var(--radius-md);font-size:.9rem;box-sizing:border-box;background-color:var(--bg-surface);color:var(--text-primary);transition:border-color var(--transition),box-shadow var(--transition)}.input-container input:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px #2563eb14}.submit-button{position:absolute;right:6px;top:50%;transform:translateY(-50%);width:34px;height:34px;background:var(--accent);border:none;border-radius:50%;color:var(--text-on-accent);cursor:pointer;display:grid;place-items:center;transition:background var(--transition),transform var(--transition)}.submit-button:hover{background:var(--accent-hover);transform:translateY(-50%) scale(1.06)}.message-group{max-width:75%;width:fit-content;animation:msgEnter .25s ease forwards}@keyframes msgEnter{0%{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}.message-group.user{align-self:flex-end}.message-group.agent{align-self:flex-start}.message-group.has-code,.message-group.has-player,.message-group.has-storyboard{max-width:100%;width:100%}.message-bubble{padding:10px 16px;border-radius:var(--radius-lg);font-size:.92rem;line-height:1.55}.user .message-bubble{background:var(--text-primary);color:var(--text-on-accent);border-bottom-right-radius:4px}.status-bubble{display:flex;align-items:center;gap:10px;padding:10px 16px;border-radius:var(--radius-lg);background:var(--bg-surface);border:1px solid var(--border);color:var(--text-secondary);font-size:.88rem}.error-bubble{background-color:var(--danger-bg);color:var(--danger);border-color:#fecaca}.icon-error{width:18px;height:18px;fill:currentColor;flex-shrink:0}.thinking-dots{display:flex;gap:4px}.thinking-dots span{width:5px;height:5px;background-color:var(--accent);border-radius:50%;animation:bounce 1.4s infinite both}.thinking-dots span:nth-child(2){animation-delay:.2s}.thinking-dots span:nth-child(3){animation-delay:.4s}@keyframes bounce{0%,80%,to{transform:scale(0)}40%{transform:scale(1)}}.code-details{border-radius:var(--radius-lg);background:#1e293b;overflow:hidden;border:1px solid #334155}.code-summary{display:flex;justify-content:space-between;align-items:center;padding:10px 14px;cursor:pointer;-webkit-user-select:none;user-select:none;list-style:none}.code-summary::-webkit-details-marker{display:none}.summary-title{display:flex;align-items:center;gap:8px;font-weight:500;font-size:.85rem;color:#94a3b8}.icon-code,.icon-chevron,.action-button svg{width:1.1em;height:1.1em;stroke:currentColor;stroke-width:1.5;fill:none;stroke-linecap:round;stroke-linejoin:round}.icon-chevron{color:#64748b;transition:transform var(--transition)}.code-details[open] .icon-chevron{transform:rotate(180deg)}.code-content{padding:0 10px 10px;max-height:22vh;overflow-y:auto}.code-content pre{margin:0;padding:10px;background:#0f172a;border-radius:var(--radius-sm);color:#cbd5e1;font-family:var(--font-mono);font-size:.8rem;line-height:1.6;overflow-x:auto}.code-content code{white-space:pre-wrap;word-break:break-all}.code-content code span{display:inline;animation:tokenFadeIn .3s forwards;opacity:0}@keyframes tokenFadeIn{to{opacity:1}}.player-container{background:var(--bg-surface);border:1px solid var(--border);border-radius:var(--radius-lg);overflow:hidden}.iframe-wrapper{aspect-ratio:16 / 9;width:100%;max-width:calc(80vh * 16 / 9);max-height:80vh;margin:0 auto;overflow:hidden;display:block}.animation-iframe{width:100%;height:100%;border:none}.player-actions{display:flex;gap:1px;background:var(--border);border-top:1px solid var(--border)}.action-button{display:flex;flex:1;align-items:center;justify-content:center;gap:6px;padding:10px;border:none;font-size:.82rem;font-weight:500;cursor:pointer;background:var(--bg-surface);color:var(--text-secondary);transition:all var(--transition)}.action-button:hover{background:var(--bg-subtle);color:var(--text-primary)}.action-button.export-video{display:none}.animated-placeholder{position:absolute;top:0;left:20px;height:54px;width:calc(100% - 70px);display:flex;align-items:center;overflow:hidden;pointer-events:none}.animated-placeholder.hidden{display:none}.animated-placeholder span{position:absolute;font-size:.95rem;font-weight:400;color:var(--text-tertiary);animation:scroll-up 4s ease-in-out forwards}@keyframes scroll-up{0%{opacity:0;transform:translateY(60%)}15%{opacity:1;transform:translateY(0)}85%{opacity:1;transform:translateY(0)}to{opacity:0;transform:translateY(-60%)}}.modal-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background:#0f172a66;display:none;align-items:center;justify-content:center;z-index:1001;backdrop-filter:blur(4px);-webkit-backdrop-filter:blur(4px);opacity:0;transition:opacity .2s ease}.modal-overlay.visible{display:flex;opacity:1}.modal-content{background:var(--bg-surface);padding:2rem 2.5rem;border-radius:var(--radius-xl);max-width:400px;width:90%;box-shadow:var(--shadow-lg);text-align:center;position:relative;transform:scale(.96);transition:transform .2s ease}.modal-overlay.visible .modal-content{transform:scale(1)}.modal-content p{margin:0 0 1.5rem;line-height:1.6;color:var(--text-primary);font-size:.92rem}.modal-button{width:100%;padding:10px;background:var(--text-primary);color:var(--text-on-accent);border:none;border-radius:var(--radius-sm);font-size:.9rem;font-weight:500;cursor:pointer;transition:background var(--transition)}.modal-button:hover{background:#1e293b}.modal-close-button{position:absolute;top:10px;right:14px;background:transparent;border:none;font-size:1.6rem;font-weight:300;color:var(--text-tertiary);cursor:pointer;line-height:1;padding:4px;transition:color var(--transition)}.modal-close-button:hover{color:var(--text-secondary)}.auth-modal-content{max-width:380px}.auth-modal-content h2{margin:0 0 1.2rem;font-size:1.2rem;font-weight:600;text-align:center}.auth-form{display:flex;flex-direction:column;gap:10px}.auth-form input{width:100%;padding:10px 14px;border:1px solid var(--border);border-radius:var(--radius-sm);font-size:.9rem;box-sizing:border-box;transition:border-color var(--transition),box-shadow var(--transition)}.auth-form input:focus{border-color:var(--accent);outline:none;box-shadow:0 0 0 3px #2563eb14}.auth-error{color:var(--danger);font-size:.8rem;margin:0;min-height:1.2em}.auth-switch{text-align:center;font-size:.82rem;color:var(--text-secondary);margin:0}.auth-switch a{color:var(--accent);text-decoration:none;font-weight:500}.overlay{position:fixed;top:0;left:0;width:100vw;height:100vh;background-color:#0f172a4d;z-index:9998}.warning-box{position:fixed;top:50%;left:50%;transform:translate(-50%,-50%);background:var(--danger-bg);color:var(--danger);padding:18px 24px;border:1px solid #FECACA;border-radius:var(--radius-md);font-size:.9rem;font-weight:500;box-shadow:var(--shadow-lg);z-index:9999;display:flex;align-items:center;gap:1rem;max-width:90%;animation:fadeIn .2s ease-out}.warning-box .close-button{background:none;border:none;font-size:1.2rem;color:inherit;cursor:pointer;line-height:1;padding:0}@keyframes fadeIn{0%{opacity:0;transform:translate(-50%,-40%)}to{opacity:1;transform:translate(-50%,-50%)}}.storyboard-card{background:var(--bg-surface);border:1px solid var(--border);border-left:3px solid var(--accent);border-radius:var(--radius-md);padding:14px 18px;animation:msgEnter .3s ease forwards}.storyboard-header{display:flex;align-items:center;gap:8px;margin-bottom:6px}.icon-storyboard{width:18px;height:18px;stroke:var(--accent);flex-shrink:0}.sb-title{font-size:.9rem;font-weight:600;color:var(--text-primary)}.sb-meta{font-size:.78rem;color:var(--text-secondary);margin-bottom:8px;padding-left:26px}.sb-scene-list{list-style:none;padding:0 0 0 26px;margin:0;display:flex;flex-wrap:wrap;gap:4px 8px}.sb-scene-list li{font-size:.78rem;color:var(--text-secondary);padding:2px 8px;background:var(--bg-subtle);border-radius:4px;white-space:nowrap}.history-sidebar{width:272px;min-width:272px;height:100vh;background:var(--bg-surface);border-right:1px solid var(--border);display:none;flex-direction:column;z-index:50;position:sticky;top:0;transition:width var(--transition-slow),min-width var(--transition-slow),opacity var(--transition-slow)}.history-sidebar.open{display:flex}.history-sidebar.collapsed{width:0;min-width:0;overflow:hidden;border-right:none;opacity:0;display:flex}.sidebar-header{display:flex;align-items:center;justify-content:space-between;padding:14px;border-bottom:1px solid var(--border);font-weight:600;font-size:.88rem;color:var(--text-primary)}.sidebar-close{background:none;border:none;cursor:pointer;color:var(--text-tertiary);padding:4px;border-radius:4px;display:grid;place-items:center;transition:background var(--transition)}.sidebar-close:hover{background:var(--bg-subtle)}.history-list{list-style:none;margin:0;padding:2px 0;display:flex;flex-direction:column;gap:1px}.history-sidebar>.history-list{flex:1;overflow-y:auto;padding:6px}.history-list-scroll{flex:1;overflow-y:auto;padding:2px 8px 8px}.history-list-scroll::-webkit-scrollbar{width:4px}.history-list-scroll::-webkit-scrollbar-thumb{background:var(--border);border-radius:4px}.history-list-scroll::-webkit-scrollbar-track{background:transparent}.history-item{display:flex;align-items:center;padding:8px 10px;border-radius:var(--radius-sm);cursor:pointer;transition:background var(--transition);gap:6px}.history-item:hover{background:var(--bg-subtle)}.history-item.active{background:var(--accent-light)}.history-item-title{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:.82rem;color:var(--text-primary);font-weight:400}.history-item-time{font-size:.7rem;color:var(--text-tertiary);white-space:nowrap;flex-shrink:0}.history-item-delete{background:none;border:none;cursor:pointer;color:var(--text-tertiary);padding:2px;border-radius:4px;display:none;flex-shrink:0;line-height:0}.history-item:hover .history-item-delete{display:block}.history-item-delete:hover{color:var(--danger);background:#ef44440f}.history-empty{text-align:center;padding:2.5rem 1rem;color:var(--text-tertiary);font-size:.82rem}.history-group-label{padding:14px 10px 5px;font-size:.7rem;font-weight:600;letter-spacing:.03em;color:var(--text-tertiary)}.sidebar-homepage{background:#f7f8fa;border-right:1px solid #ebeef3}.sidebar-top{display:flex;align-items:center;justify-content:space-between;padding:16px 14px 8px}.sidebar-brand{display:flex;align-items:center;gap:8px}.brand-icon{color:var(--accent);flex-shrink:0}.brand-logo-wrap{flex-shrink:0}.brand-logo-img{height:32px;width:auto;display:block}.brand-text{font-size:.92rem;font-weight:600;color:var(--text-primary);letter-spacing:-.01em;white-space:nowrap}.sidebar-collapse-btn{background:none;border:none;cursor:pointer;color:var(--text-tertiary);padding:5px;border-radius:var(--radius-sm);display:grid;place-items:center;transition:all var(--transition)}.sidebar-collapse-btn:hover{background:#0000000d;color:var(--text-secondary)}.new-chat-btn{display:flex;align-items:center;justify-content:center;gap:7px;margin:6px 12px 4px;padding:10px 14px;border:1px dashed var(--border);border-radius:var(--radius-md);background:var(--bg-surface);color:var(--text-secondary);font-size:.84rem;font-weight:500;cursor:pointer;transition:all var(--transition);white-space:nowrap}.new-chat-btn:hover{border-color:var(--accent);color:var(--accent);background:var(--accent-light)}.sidebar-homepage .history-item:hover{background:#0000000a}.sidebar-homepage .history-item.active{background:var(--bg-surface);box-shadow:0 1px 3px #0000000a}.sidebar-login-prompt{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:2rem 1.5rem;text-align:center;gap:12px}.login-prompt-icon{color:var(--text-tertiary);opacity:.5}.sidebar-login-prompt p{color:var(--text-tertiary);font-size:.84rem;margin:0;line-height:1.5}.sidebar-login-btn{padding:7px 20px;border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--bg-surface);color:var(--text-secondary);font-size:.84rem;font-weight:500;cursor:pointer;transition:all var(--transition)}.sidebar-login-btn:hover{border-color:var(--accent);color:var(--accent);background:var(--accent-light)}.sidebar-user{display:flex;align-items:center;gap:10px;padding:12px 14px;border-top:1px solid #ebeef3;margin-top:auto}.sidebar-user-avatar{width:30px;height:30px;border-radius:50%;background:var(--accent);color:#fff;font-size:.78rem;font-weight:600;display:grid;place-items:center;flex-shrink:0}.sidebar-user-name{flex:1;font-size:.82rem;font-weight:500;color:var(--text-primary);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.sidebar-user-logout{background:none;border:none;cursor:pointer;color:var(--text-tertiary);padding:4px;border-radius:4px;display:grid;place-items:center;transition:all var(--transition)}.sidebar-user-logout:hover{color:var(--danger);background:#ef44440f}.sidebar-expand-btn{position:fixed;top:16px;left:16px;z-index:60;background:var(--bg-surface);border:1px solid var(--border);border-radius:var(--radius-sm);padding:7px;cursor:pointer;color:var(--text-tertiary);box-shadow:var(--shadow-sm);display:grid;place-items:center;transition:all var(--transition);animation:fadeIn .2s ease-out}.sidebar-expand-btn:hover{color:var(--text-primary);border-color:var(--text-tertiary);box-shadow:var(--shadow-md)}@media(max-width:768px){.history-sidebar:not(.sidebar-homepage){position:fixed;top:0;left:0;width:260px;box-shadow:var(--shadow-lg)}.history-sidebar.sidebar-homepage{position:fixed;top:0;left:0;height:100vh;box-shadow:2px 0 12px #00000014}.history-sidebar.sidebar-homepage.collapsed{transform:translate(-100%)}}.showcase-section{width:100%;max-width:860px;margin-top:3rem;animation:heroEnter .6s ease forwards;animation-delay:.15s;opacity:0}.showcase-title{font-size:.85rem;font-weight:500;color:var(--text-tertiary);margin:0 0 1rem;text-align:center;letter-spacing:.03em;text-transform:uppercase}.showcase-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:10px}.showcase-card{background:var(--bg-surface);border:1px solid var(--border);border-radius:var(--radius-md);overflow:hidden;cursor:pointer;transition:box-shadow var(--transition-slow),transform var(--transition)}.showcase-card:hover{box-shadow:var(--shadow-md);transform:translateY(-2px)}.showcase-card-preview{aspect-ratio:16/9;width:100%;border:none;pointer-events:none;background:var(--bg)}.showcase-card-title{padding:10px 12px;font-size:.82rem;font-weight:500;color:var(--text-primary);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.showcase-card-preview.loading{background:linear-gradient(90deg,var(--bg) 25%,var(--bg-subtle) 50%,var(--bg) 75%);background-size:200% 100%;animation:shimmer 1.5s infinite}@keyframes shimmer{0%{background-position:200% 0}to{background-position:-200% 0}}.confirm-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background:#0f172a66;z-index:2000;display:flex;align-items:center;justify-content:center;backdrop-filter:blur(4px);-webkit-backdrop-filter:blur(4px)}.confirm-dialog{background:var(--bg-surface);border-radius:var(--radius-xl);padding:1.5rem 2rem;max-width:340px;width:90%;box-shadow:var(--shadow-lg);text-align:center}.confirm-dialog p{margin:0 0 1.2rem;font-size:.9rem;color:var(--text-primary);line-height:1.5}.confirm-actions{display:flex;gap:8px}.confirm-actions button{flex:1;padding:9px;border-radius:var(--radius-sm);font-size:.85rem;font-weight:500;cursor:pointer;border:none;transition:background var(--transition)}.confirm-cancel{background:var(--bg-subtle);color:var(--text-primary)}.confirm-cancel:hover{background:var(--border)}.confirm-danger{background:var(--danger);color:#fff}.confirm-danger:hover{background:#dc2626}