*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--bg: #0f1117;--surface: #1a1b23;--border: #2a2b35;--text: #e4e4e7;--text-muted: #8b8b96;--primary: #6366f1;--primary-hover: #818cf8;--danger: #ef4444}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text);height:100vh}#root{height:100%}.app-container{display:flex;flex-direction:column;height:100%}.app-header{display:flex;align-items:center;justify-content:space-between;padding:12px 24px;background:var(--surface);border-bottom:1px solid var(--border)}.app-header h1{font-size:20px;font-weight:600;background:linear-gradient(90deg,#4285f4,#9b72cb,#d96570,#d96570,#9b72cb,#4285f4);background-size:300% 100%;-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;animation:gradient-flow 6s ease infinite;transition:opacity .3s ease}.app-header h1.hidden{opacity:0;pointer-events:none}.app-main{flex:1;overflow:hidden}.tabs{display:flex;gap:4px;background:var(--bg);padding:4px;border-radius:10px}.tab{padding:8px 20px;border:none;background:transparent;color:var(--text-muted);font-size:14px;font-weight:500;cursor:pointer;border-radius:8px;transition:all .15s}.tab:hover{color:var(--text);background:var(--border)}.tab.active{color:#fff;background:var(--primary)}.tab-new-chat{position:relative;background:var(--surface)!important;color:var(--text)!important;border:none}.tab-new-chat:before{content:"";position:absolute;top:0;right:0;bottom:0;left:0;border-radius:8px;padding:2px;background:linear-gradient(90deg,#4285f4,#9b72cb,#d96570,#d96570,#9b72cb,#4285f4);background-size:300% 100%;animation:gradient-flow 6s ease infinite;-webkit-mask:linear-gradient(#fff 0 0) content-box,linear-gradient(#fff 0 0);-webkit-mask-composite:xor;mask-composite:exclude}.tab-new-chat:hover{background:var(--border)!important}.chat-layout{display:grid;grid-template-columns:280px 1fr;height:100%;overflow:hidden}.chat-sidebar{background:var(--surface);border-right:1px solid var(--border);display:flex;flex-direction:column;overflow:hidden}.chat-sidebar-header{display:flex;align-items:center;justify-content:space-between;padding:16px;border-bottom:1px solid var(--border)}.chat-sidebar-header h2{font-size:16px;font-weight:600}.new-chat-btn{display:flex;align-items:center;gap:6px;padding:8px 12px;border-radius:8px;border:none;background:var(--primary);color:#fff;font-size:13px;font-weight:500;cursor:pointer;transition:background .15s}.new-chat-btn:hover{background:var(--primary-hover)}.chat-sidebar-list{flex:1;overflow-y:auto;overflow-x:hidden;padding:8px}.chat-sidebar-empty{padding:24px 16px;text-align:center;color:var(--text-muted);font-size:13px}.chat-sidebar-item{display:flex;align-items:center;justify-content:space-between;padding:12px 14px;border-radius:8px;cursor:pointer;transition:background .15s;margin-bottom:4px}.chat-sidebar-item:hover{background:var(--border)}.chat-sidebar-item.active{background:var(--primary)}.chat-sidebar-item-content{display:flex;flex-direction:column;align-items:flex-start;gap:2px;flex:1;min-width:0;overflow:hidden}.chat-sidebar-item-title{font-size:14px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:100%;display:block}.chat-sidebar-item-badge{display:inline-flex;align-items:center;gap:4px;margin-top:4px;padding:3px 8px;border-radius:12px;background:#6366f126;color:var(--primary);font-size:11px;font-weight:500;max-width:100%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.chat-sidebar-item-badge svg{flex-shrink:0}.chat-sidebar-item.active .chat-sidebar-item-badge{background:#fff3;color:#fff}.chat-sidebar-item-delete{background:none;border:none;color:var(--text-muted);cursor:pointer;padding:4px;border-radius:4px;opacity:0;transition:all .15s}.chat-sidebar-item:hover .chat-sidebar-item-delete{opacity:1}.chat-sidebar-item-delete:hover{color:var(--danger);background:#ef444426}.chat-view{display:flex;flex-direction:column;height:100%;min-height:0;position:relative;animation:chat-view-enter .25s ease-out}@keyframes chat-view-enter{0%{opacity:0}to{opacity:1}}.chat-view-empty{display:flex;align-items:center;justify-content:center}.chat-placeholder{display:flex;align-items:center;justify-content:center;height:100%;background:var(--bg);animation:fade-in .25s ease-out}@keyframes fade-in{0%{opacity:0}to{opacity:1}}.chat-placeholder-content{text-align:center;color:var(--text-muted)}.chat-placeholder-content svg{margin-bottom:16px;opacity:.5}.chat-placeholder-content p{font-size:15px}.chat-empty-content{text-align:center;max-width:400px}.chat-empty-icon{color:var(--text-muted);margin-bottom:16px}.chat-empty-content h2{font-size:20px;font-weight:600;margin-bottom:8px}.chat-empty-content p{color:var(--text-muted);font-size:14px;margin-bottom:24px}.chat-empty-actions{display:flex;gap:12px;justify-content:center}.chat-empty-select{padding:10px 14px;border-radius:8px;border:1px solid var(--border);background:var(--surface);color:var(--text);font-size:14px;min-width:160px;cursor:pointer}.chat-empty-select:focus{outline:none;border-color:var(--primary)}.chat-empty-btn{display:flex;align-items:center;gap:8px;padding:10px 20px;border-radius:8px;border:none;background:var(--primary);color:#fff;font-size:14px;font-weight:500;cursor:pointer;transition:background .15s}.chat-empty-btn:hover{background:var(--primary-hover)}.chat-view-header{display:flex;align-items:center;justify-content:space-between;padding:12px 20px;border-bottom:1px solid var(--border);background:var(--surface)}.chat-view-title{font-size:15px;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.chat-view-collection select{padding:8px 12px;border-radius:6px;border:1px solid var(--border);background:var(--bg);color:var(--text);font-size:13px;cursor:pointer}.chat-view-collection select:focus{outline:none;border-color:var(--primary)}.chat-page{display:flex;flex-direction:column;height:100%;position:relative}.chat-header{display:flex;align-items:center;justify-content:space-between;padding:16px 24px;border-bottom:1px solid var(--border)}.chat-header h2{font-size:16px;font-weight:600}.collection-selector{display:flex;align-items:center;gap:10px}.collection-selector label{font-size:14px;color:var(--text-muted)}.collection-selector select{padding:8px 12px;border-radius:8px;border:1px solid var(--border);background:var(--surface);color:var(--text);font-size:14px;min-width:200px;cursor:pointer}.collection-selector select:focus{outline:none;border-color:var(--primary)}.chat-window{flex:1;display:flex;flex-direction:column;overflow:hidden;min-height:0}.message-list{flex:1;overflow-y:auto;display:flex;flex-direction:column;min-height:0}.message-list-inner{max-width:900px;width:100%;margin:0 auto;padding:24px;display:flex;flex-direction:column;gap:16px;box-sizing:border-box}.message{max-width:75%;padding:12px 16px;border-radius:12px;font-size:14px;line-height:1.5;white-space:pre-wrap}.message.user{align-self:flex-end;background:var(--primary);color:#fff}.message.assistant{align-self:flex-start;background:var(--surface);border:1px solid var(--border)}.thinking-message{padding:16px 20px}.thinking-content{display:flex;align-items:center;gap:12px}.thinking-orb{width:20px;height:20px;border-radius:50%;background:linear-gradient(135deg,#4285f4,#9b72cb,#d96570);background-size:200% 200%;animation:orb-glow 2s ease-in-out infinite,orb-gradient 3s ease infinite;flex-shrink:0}@keyframes orb-glow{0%,to{box-shadow:0 0 15px #6366f166}50%{box-shadow:0 0 25px #9b72cb99}}@keyframes orb-gradient{0%{background-position:0% 50%}50%{background-position:100% 50%}to{background-position:0% 50%}}.thinking-text{color:var(--text-muted);font-size:14px;position:relative}.thinking-text:after{content:"";animation:thinking-dots 1.5s infinite}@keyframes thinking-dots{0%{content:""}25%{content:"."}50%{content:".."}75%{content:"..."}to{content:""}}.message-input-wrapper{position:relative}.message-input-wrapper:before{content:"";position:absolute;top:-60px;left:0;right:0;height:60px;background:linear-gradient(to bottom,transparent,var(--bg));pointer-events:none}.message-input{padding:16px 24px;display:flex;gap:12px;max-width:900px;width:100%;margin:0 auto;box-sizing:border-box}.message-input input{flex:1;padding:10px 16px;border-radius:10px;border:1px solid var(--border);background:var(--surface);color:var(--text);font-size:14px;outline:none}.message-input input:focus{border-color:var(--primary)}.message-input button{padding:10px 20px;border-radius:10px;border:none;background:var(--primary);color:#fff;cursor:pointer;font-size:14px}.message-input button:disabled{opacity:.5;cursor:not-allowed}.collections-page{height:100%;padding:24px;animation:page-enter .5s cubic-bezier(.16,1,.3,1)}@keyframes page-enter{0%{opacity:0;transform:translateY(30px) scale(.98)}to{opacity:1;transform:translateY(0) scale(1)}}.collections-grid{display:grid;grid-template-columns:400px 1fr;gap:24px;height:100%}.collections-list-panel,.collection-details-panel{background:var(--surface);border-radius:12px;border:1px solid var(--border);display:flex;flex-direction:column;overflow:hidden}.panel-header{display:flex;align-items:center;justify-content:space-between;padding:16px 20px;border-bottom:1px solid var(--border)}.panel-header h2{font-size:16px;font-weight:600}.panel-header .count{font-size:12px;padding:4px 10px;border-radius:12px;background:var(--border);color:var(--text-muted)}.collections-list{flex:1;overflow-y:auto;padding:12px}.collection-card{display:flex;justify-content:space-between;align-items:center;padding:14px 16px;border-radius:10px;cursor:pointer;transition:background .15s;margin-bottom:8px}.collection-card:hover{background:var(--border)}.collection-card.active{background:var(--primary)}.collection-info{display:flex;flex-direction:column;gap:4px;overflow:hidden}.collection-name{font-size:14px;font-weight:500;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.collection-desc{font-size:12px;color:var(--text-muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.collection-card.active .collection-desc{color:#ffffffb3}.delete-btn{background:none;border:none;color:var(--text-muted);cursor:pointer;font-size:18px;padding:4px 8px;border-radius:6px;line-height:1}.delete-btn:hover{color:var(--danger);background:#ef444426}.empty-hint{text-align:center;color:var(--text-muted);padding:24px;font-size:14px}.create-form{padding:16px;border-top:1px solid var(--border);display:flex;flex-direction:column;gap:10px}.create-form input{width:100%;padding:10px 14px;border-radius:8px;border:1px solid var(--border);background:var(--bg);color:var(--text);font-size:14px}.create-form input:focus{outline:none;border-color:var(--primary)}.create-form button{width:100%;padding:10px 14px;border-radius:8px;border:none;background:var(--primary);color:#fff;cursor:pointer;font-size:14px;font-weight:500;transition:background .15s}.create-form button:hover:not(:disabled){background:var(--primary-hover)}.create-form button:disabled{opacity:.5;cursor:not-allowed}.collection-details-panel .description{padding:0 20px 16px;font-size:14px;color:var(--text-muted)}.detail-panel{padding:16px 20px;flex:1;overflow-y:auto}.detail-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px}.detail-panel h3{font-size:13px;color:var(--text-muted);margin-bottom:0;text-transform:uppercase;letter-spacing:.5px}.refresh-btn{display:flex;align-items:center;justify-content:center;width:32px;height:32px;border:none;border-radius:8px;background:var(--bg);color:var(--text-muted);cursor:pointer;transition:all .15s}.refresh-btn:hover{background:var(--border);color:var(--primary)}.refresh-btn:active{transform:rotate(180deg)}.file-list{list-style:none;font-size:14px}.file-list li{padding:10px 12px;background:var(--bg);border-radius:8px;margin-bottom:8px;display:flex;align-items:center;gap:10px;justify-content:space-between}.file-list li:before{content:"📄"}.file-name{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.status-badge{font-size:11px;font-weight:500;padding:4px 8px;border-radius:6px;text-transform:uppercase;letter-spacing:.3px;flex-shrink:0}.status-processing{background:#fbbf2426;color:#fbbf24;animation:pulse 1.5s infinite}.status-completed{background:#22c55e26;color:#22c55e}.status-failed{background:#ef444426;color:#ef4444}.download-btn{background:none;border:none;color:var(--text-muted);cursor:pointer;font-size:14px;padding:4px 8px;border-radius:6px;line-height:1;flex-shrink:0}.download-btn:hover{color:var(--primary);background:#6366f126}.delete-file-btn{background:none;border:none;color:var(--text-muted);cursor:pointer;font-size:16px;padding:4px 8px;border-radius:6px;line-height:1;flex-shrink:0}.delete-file-btn:hover{color:var(--danger);background:#ef444426}@keyframes pulse{0%,to{opacity:1}50%{opacity:.5}}.file-upload-area{padding:16px 20px;border-top:1px solid var(--border)}.file-upload-area .btn{width:100%;padding:10px 14px;border-radius:8px;border:none;background:var(--primary);color:#fff;cursor:pointer;font-size:14px;display:flex;align-items:center;justify-content:center;gap:8px;transition:opacity .15s}.file-upload-area .btn:disabled{opacity:.7;cursor:not-allowed}.file-upload-area .btn .spinner{width:16px;height:16px;border-width:2px}.file-upload-area input[type=file]{display:none}.empty-state{display:flex;align-items:center;justify-content:center;height:100%;color:var(--text-muted);font-size:15px}.start-page{display:flex;align-items:center;justify-content:center;height:100%;padding:24px}.start-content{width:100%;max-width:640px;text-align:center}.start-title{font-size:36px;font-weight:600;margin-bottom:8px;background:linear-gradient(90deg,#4285f4,#9b72cb,#d96570,#d96570,#9b72cb,#4285f4);background-size:300% 100%;-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;animation:gradient-flow 6s ease infinite}@keyframes gradient-flow{0%{background-position:0% 50%}50%{background-position:100% 50%}to{background-position:0% 50%}}.start-subtitle{font-size:16px;color:var(--text-muted);margin-bottom:32px}.start-form{width:100%}.start-input-wrapper{background:var(--surface);border:1px solid var(--border);border-radius:16px;overflow:hidden}.start-input{width:100%;padding:20px;border:none;background:transparent;color:var(--text);font-size:16px;resize:none;outline:none;font-family:inherit}.start-input::placeholder{color:var(--text-muted)}.start-actions{display:flex;align-items:center;justify-content:space-between;padding:12px 16px;border-top:1px solid var(--border);background:var(--bg)}.start-collection-select{padding:10px 36px 10px 14px;border-radius:10px;border:1px solid var(--border);background:var(--surface);color:var(--text);font-size:14px;min-width:200px;cursor:pointer;-webkit-appearance:none;-moz-appearance:none;appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%238b8b96' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 12px center;transition:all .15s}.start-collection-select:hover{border-color:var(--text-muted)}.start-collection-select:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px #6366f126}.start-collection-select option{background:var(--surface);color:var(--text);padding:10px}.start-submit{padding:10px 24px;border-radius:10px;border:none;background:var(--primary);color:#fff;cursor:pointer;font-size:14px;font-weight:500;transition:background .15s}.start-submit:hover:not(:disabled){background:var(--primary-hover)}.start-submit:disabled{opacity:.5;cursor:not-allowed}.start-recent{margin-top:32px}.start-recent h3{font-size:13px;font-weight:500;color:var(--text-muted);text-transform:uppercase;letter-spacing:.5px;margin-bottom:12px}.start-recent-list{display:flex;flex-wrap:wrap;gap:8px;justify-content:center}.start-recent-item{display:flex;align-items:center;gap:8px;padding:10px 16px;border-radius:20px;border:1px solid var(--border);background:var(--surface);color:var(--text);font-size:14px;cursor:pointer;transition:all .15s;max-width:200px}.start-recent-item span{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.start-recent-item:hover{background:var(--border);border-color:var(--primary)}.start-recent-item svg{flex-shrink:0;color:var(--text-muted)}.chat-header-left{display:flex;align-items:center}.back-btn{padding:8px 16px;border-radius:8px;border:1px solid var(--border);background:var(--surface);color:var(--text);cursor:pointer;font-size:14px;transition:all .15s}.back-btn:hover{background:var(--border)}.chat-collection-badge{padding:6px 12px;border-radius:6px;background:var(--primary);color:#fff;font-size:13px;font-weight:500}.chat-collection-indicator{position:absolute;top:12px;left:50%;transform:translate(-50%);padding:6px 14px;border-radius:20px;background:var(--surface);border:1px solid var(--border);color:var(--text-muted);font-size:12px;font-weight:500;z-index:10}.start-page{animation:start-page-enter .5s ease-out}.start-page.exiting{animation:start-page-exit .6s ease-in-out forwards}@keyframes start-page-enter{0%{opacity:0;transform:scale(.95)}to{opacity:1;transform:scale(1)}}@keyframes start-page-exit{0%{opacity:1;transform:scale(1)}50%{opacity:1;transform:scale(1.02)}to{opacity:0;transform:scale(.9) translateY(-30px);filter:blur(10px)}}.chat-page{animation:chat-page-enter .7s cubic-bezier(.16,1,.3,1)}@keyframes chat-page-enter{0%{opacity:0;transform:translateY(60px) scale(.95);filter:blur(10px)}to{opacity:1;transform:translateY(0) scale(1);filter:blur(0)}}.chat-page .chat-header{animation:header-slide-in .5s cubic-bezier(.16,1,.3,1) .2s both}@keyframes header-slide-in{0%{opacity:0;transform:translateY(-20px)}to{opacity:1;transform:translateY(0)}}.chat-page .chat-window{animation:window-fade-in .6s ease-out .3s both}@keyframes window-fade-in{0%{opacity:0}to{opacity:1}}.chat-page .message{animation:message-pop-in .4s cubic-bezier(.34,1.56,.64,1) both}@keyframes message-pop-in{0%{opacity:0;transform:scale(.8) translateY(20px)}to{opacity:1;transform:scale(1) translateY(0)}}.auth-page{display:flex;align-items:center;justify-content:center;min-height:100vh;padding:24px;background:var(--bg)}.auth-container{width:100%;max-width:400px;text-align:center}.auth-title{font-size:32px;font-weight:600;margin-bottom:8px;background:linear-gradient(90deg,#4285f4,#9b72cb,#d96570,#d96570,#9b72cb,#4285f4);background-size:300% 100%;-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;animation:gradient-flow 6s ease infinite}.auth-subtitle{font-size:15px;color:var(--text-muted);margin-bottom:32px}.auth-form{background:var(--surface);border:1px solid var(--border);border-radius:16px;padding:24px}.auth-name-row{display:grid;grid-template-columns:1fr 1fr;gap:12px}.auth-name-row .auth-field{margin-bottom:16px}.auth-field{margin-bottom:16px;text-align:left}.auth-field label{display:block;font-size:13px;font-weight:500;color:var(--text-muted);margin-bottom:6px}.auth-field input{width:100%;padding:12px 14px;border-radius:10px;border:1px solid var(--border);background:var(--bg);color:var(--text);font-size:14px;outline:none;transition:border-color .15s}.auth-field input:focus{border-color:var(--primary)}.auth-field input::placeholder{color:var(--text-muted)}.auth-error{padding:10px 14px;margin-bottom:16px;border-radius:8px;background:#ef444426;color:#ef4444;font-size:13px;text-align:left}.auth-submit{width:100%;padding:12px;border-radius:10px;border:none;background:var(--primary);color:#fff;font-size:14px;font-weight:500;cursor:pointer;transition:background .15s}.auth-submit:hover:not(:disabled){background:var(--primary-hover)}.auth-submit:disabled{opacity:.5;cursor:not-allowed}.auth-switch{margin-top:20px;font-size:14px;color:var(--text-muted)}.auth-switch button{background:none;border:none;color:var(--primary);cursor:pointer;font-size:14px;font-weight:500}.auth-switch button:hover{color:var(--primary-hover)}.header-right{display:flex;align-items:center;gap:16px}.user-menu{position:relative}.user-avatar-btn{width:36px;height:36px;border-radius:50%;border:1px solid var(--border);background:var(--surface);color:var(--text);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .15s}.user-avatar-btn:hover{background:var(--border);border-color:var(--primary);color:var(--primary)}.user-dropdown{position:absolute;top:calc(100% + 8px);right:0;min-width:220px;background:var(--surface);border:1px solid var(--border);border-radius:12px;box-shadow:0 8px 24px #0000004d;z-index:100;animation:dropdown-enter .15s ease-out}@keyframes dropdown-enter{0%{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:translateY(0)}}.user-dropdown-info{padding:14px 16px}.user-dropdown-name{font-size:14px;font-weight:600;color:var(--text);margin-bottom:4px}.user-dropdown-email{font-size:13px;color:var(--text-muted)}.user-dropdown-divider{height:1px;background:var(--border)}.user-dropdown-logout{width:100%;display:flex;align-items:center;gap:10px;padding:12px 16px;border:none;background:transparent;color:var(--text);font-size:14px;cursor:pointer;transition:all .15s;border-radius:0 0 12px 12px}.user-dropdown-logout:hover{background:#ef44441a;color:var(--danger)}.app-loading{display:flex;align-items:center;justify-content:center;height:100vh;color:var(--text-muted);font-size:15px}.start-collection-badge{display:inline-flex;align-items:center;gap:8px;padding:10px 16px;border-radius:10px;background:#6366f126;color:var(--primary);font-size:14px;font-weight:500}.start-collection-badge svg{flex-shrink:0}.start-no-collections{color:var(--text-muted);font-size:14px}.start-loading{display:flex;align-items:center;gap:10px;color:var(--text-muted);font-size:14px}.spinner{width:18px;height:18px;border:2px solid var(--border);border-top-color:var(--primary);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.collections-loading{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100%;gap:16px;color:var(--text-muted);font-size:15px}.collections-loading .spinner{width:32px;height:32px}.header-left{display:flex;align-items:center;gap:12px}.mobile-menu-btn{display:none;width:36px;height:36px;border:none;border-radius:8px;background:var(--bg);color:var(--text);cursor:pointer;align-items:center;justify-content:center;transition:background .15s}.mobile-menu-btn:hover{background:var(--border)}.chat-sidebar-wrapper{display:contents}.sidebar-overlay{display:none}@media(max-width:768px){.app-header{padding:10px 16px}.app-header h1{font-size:18px}.tabs{padding:3px}.tab{padding:6px 12px;font-size:13px}.mobile-menu-btn{display:flex}.chat-layout{grid-template-columns:1fr;position:relative}.chat-sidebar-wrapper{display:block;position:fixed;top:0;left:0;bottom:0;width:280px;z-index:100;transform:translate(-100%);transition:transform .3s ease}.chat-sidebar-wrapper.open{transform:translate(0)}.chat-sidebar-wrapper .chat-sidebar{display:flex;height:100%}.sidebar-overlay{display:block;position:fixed;top:0;right:0;bottom:0;left:0;background:#00000080;z-index:99;animation:fade-in .2s ease}.collections-grid{grid-template-columns:1fr;gap:16px}.collections-page{padding:16px}.start-title{font-size:28px}.start-subtitle{font-size:14px;margin-bottom:24px}.start-input{padding:16px;font-size:15px}.start-actions{flex-direction:column;gap:10px}.start-collection-select{width:100%;min-width:unset}.start-submit{width:100%}.start-collection-badge,.start-loading{width:100%;justify-content:center}.start-no-collections{width:100%;text-align:center}.start-recent-list{flex-direction:column}.start-recent-item{max-width:100%}.message-input{padding:12px 16px}.message-list-inner{padding:16px}.message{max-width:85%}.user-dropdown{right:-8px;min-width:200px}}@media(max-width:480px){.app-header h1{display:none}.header-right{width:100%;justify-content:space-between}.tab{padding:6px 10px;font-size:12px}.start-page{padding:16px}.start-title{font-size:24px}.start-content{max-width:100%}.start-input-wrapper{border-radius:12px}.start-input{padding:14px;font-size:14px}.start-actions{padding:10px 12px}.panel-header{padding:12px 16px}.panel-header h2{font-size:15px}.create-form{padding:12px}.create-form input{padding:10px 12px}.detail-panel{padding:12px 16px}.file-list li{padding:8px 10px;font-size:13px}.auth-container{padding:0 16px}.auth-title{font-size:26px}.auth-form{padding:20px 16px}.auth-name-row{grid-template-columns:1fr}}