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ease;flex-shrink:0}.chat-send-btn:hover:not(:disabled){background-color:var(--text-secondary)}.chat-send-btn:disabled{background-color:var(--bg-tertiary);color:var(--text-tertiary);cursor:not-allowed}.chat-send-btn svg{width:14px;height:14px}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100%;color:var(--text-secondary);text-align:center;padding:var(--space-8);animation:fadeIn .4s ease-out}.empty-state-icon{font-size:2.5rem;margin-bottom:var(--space-4);opacity:.4}.empty-state p{max-width:400px;font-size:var(--font-size-base);line-height:1.6}.loading-error{display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:var(--space-8);color:var(--text-secondary);animation:fadeIn .4s ease-out}.loading-error p{margin-bottom:var(--space-2);font-size:var(--font-size-base)}.loading-error-hint{color:var(--text-tertiary);font-size:var(--font-size-sm)}.btn{padding:var(--space-2) var(--space-4);font-size:var(--font-size-sm);font-weight:500;font-family:var(--font-sans);border-radius:var(--radius-md);border:1px solid transparent;cursor:pointer;transition:all var(--transition-base);box-shadow:var(--shadow-sm)}.btn:hover:not(:disabled){transform:translateY(-1px);box-shadow:var(--shadow-md)}.btn:active:not(:disabled){transform:translateY(0)}.btn-primary{background-color:var(--accent-600);color:#fff}.btn-primary:hover:not(:disabled){background-color:var(--accent-500)}.btn-primary:disabled{background-color:var(--bg-tertiary);color:var(--text-tertiary);cursor:not-allowed;box-shadow:none}.btn-secondary{background-color:var(--bg-elevated);border-color:var(--border-default);color:var(--text-primary)}.btn-secondary:hover:not(:disabled){background-color:var(--bg-secondary)}.btn-danger{background-color:var(--error);color:#fff}.btn-danger:hover:not(:disabled){background-color:#dc2626}.btn-sm{padding:6px var(--space-3);font-size:var(--font-size-xs)}.error-banner{background-color:#fef2f2;border:1px solid var(--error);color:var(--error);padding:var(--space-3) var(--space-4);border-radius:var(--radius-lg);margin-bottom:var(--space-4);font-size:var(--font-size-sm)}.loading{display:flex;align-items:center;gap:var(--space-2);color:var(--text-secondary);font-size:var(--font-size-sm)}.loading-spinner{width:16px;height:16px;border:2px solid var(--border-default);border-top-color:var(--accent-500);border-radius:50%;animation:spin 1s linear infinite}.thinking{margin-top:var(--space-3);padding-left:36px}.thinking summary{cursor:pointer;font-size:var(--font-size-sm);color:var(--text-secondary);font-weight:500;transition:color var(--transition-fast)}.thinking summary:hover{color:var(--text-primary)}.thinking pre{margin-top:var(--space-2);padding:var(--space-3);background-color:var(--bg-secondary);border-radius:var(--radius-md);font-size:var(--font-size-sm);white-space:pre-wrap;color:var(--text-secondary);border:1px solid var(--border-subtle)}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--border-default);border-radius:4px}::-webkit-scrollbar-thumb:hover{background:var(--text-tertiary)}*{scrollbar-width:thin;scrollbar-color:var(--border-default) transparent}.sidebar-empty{padding:var(--space-4);text-align:center;color:var(--text-tertiary);font-size:var(--font-size-sm);animation:fadeIn .3s ease-out}.sidebar-footer{padding:var(--space-4);border-top:1px solid var(--border-subtle)}.user-info{display:flex;align-items:center;gap:var(--space-3);margin-bottom:var(--space-3)}.user-avatar{width:32px;height:32px;border-radius:50%;object-fit:cover;flex-shrink:0}.user-name{font-size:var(--font-size-sm);font-weight:500;color:var(--text-primary);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.logout-btn{width:100%;padding:var(--space-2);font-size:var(--font-size-sm);font-family:var(--font-sans);background:none;border:1px solid var(--border-default);border-radius:var(--radius-md);color:var(--text-secondary);cursor:pointer;transition:all var(--transition-base)}.logout-btn:hover{background-color:var(--bg-tertiary);color:var(--text-primary);transform:translateY(-1px);box-shadow:var(--shadow-sm)}.logout-btn:active{transform:translateY(0)}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background-color:#0f172a4d;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);display:flex;align-items:center;justify-content:center;z-index:1000;animation:fadeIn .15s ease}.modal{background-color:var(--bg-elevated);border:1px solid var(--border-default);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);width:100%;max-width:360px;margin:16px;animation:slideUp .2s ease}@keyframes slideUp{0%{opacity:0;transform:translateY(8px) scale(.98)}to{opacity:1;transform:translateY(0) scale(1)}}.modal-header{padding:16px 20px 0}.modal-header h3{font-size:15px;font-weight:600;color:var(--text-primary);margin:0}.modal-body{padding:10px 20px 16px}.modal-body p{font-size:13px;color:var(--text-secondary);margin:0;line-height:1.5}.modal-session-title{margin-top:6px!important;font-weight:500;color:var(--text-primary)!important;word-break:break-word}.modal-actions{display:flex;gap:8px;padding:0 20px 16px;justify-content:flex-end}.modal-btn{padding:7px 14px;font-size:13px;font-weight:500;font-family:var(--font-sans);border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-fast)}.modal-btn-cancel{background-color:var(--bg-secondary);border:1px solid var(--border-default);color:var(--text-secondary)}.modal-btn-cancel:hover{background-color:var(--bg-tertiary);color:var(--text-primary)}.modal-btn-delete{background-color:#b91c1c;border:none;color:#fff}.modal-btn-delete:hover{background-color:#991b1b}.cat-mascot{display:inline-flex;align-items:center;justify-content:center;font-family:Noto Sans,sans-serif;font-size:1.5rem;font-weight:700;color:var(--text-tertiary);letter-spacing:0;line-height:1;-webkit-user-select:none;user-select:none;transition:transform .2s ease,color .2s ease;position:relative;margin-bottom:var(--space-4);z-index:1}.cat-mascot-part{display:inline-block;transition:transform .15s ease}.cat-mascot-eye{transition:opacity .1s ease}.cat-mascot-zzz{position:absolute;top:-8px;right:-12px;font-size:.625rem;color:var(--text-tertiary);opacity:.6;animation:catZzz 2s ease-in-out infinite}.cat-mascot--idle{animation:catFloat 3s ease-in-out infinite}.cat-mascot--typing{animation:catBounce .4s ease-in-out infinite;color:var(--text-secondary)}.cat-mascot--typing .cat-mascot-outer{transform:translateY(-2px)}.cat-mascot--happy{color:var(--text-secondary);transform:scale(1.05)}.cat-mascot--sleepy{color:var(--text-tertiary);opacity:.7}.cat-mascot--blinking .cat-mascot-eye{opacity:.8}@keyframes catFloat{0%,to{transform:translateY(0)}50%{transform:translateY(-3px)}}@keyframes catBounce{0%,to{transform:translateY(0)}50%{transform:translateY(-4px)}}@keyframes catZzz{0%,to{transform:translateY(0) translate(0);opacity:.6}50%{transform:translateY(-4px) translate(2px);opacity:.3}}@media (prefers-reduced-motion: reduce){.cat-mascot,.cat-mascot--idle,.cat-mascot--typing,.cat-mascot-zzz{animation:none!important}.cat-mascot--typing .cat-mascot-outer,.cat-mascot--happy{transform:none}@keyframes fadeIn{0%,to{opacity:1}}@keyframes fadeInUp{0%,to{opacity:1;transform:none}}@keyframes fadeInDown{0%,to{opacity:1;transform:none}}@keyframes pulse{0%,to{opacity:1}}@keyframes ringPulse{0%,to{transform:scale(1);opacity:0}}}.landing-page{height:100vh;display:flex;flex-direction:column;background:var(--bg-primary);overflow:hidden}.landing-header{position:relative;z-index:10;flex-shrink:0;padding:20px 40px;display:flex;align-items:center;justify-content:space-between}.landing-logo{display:flex;align-items:center;gap:10px;font-size:20px;font-weight:600;color:var(--text-primary);letter-spacing:-.01em}.landing-logo .logo-emoticon{font-family:Noto Sans,sans-serif;font-size:18px;font-weight:700;letter-spacing:0;line-height:1}.landing-nav-link{font-size:var(--font-size-sm);font-weight:500;color:var(--text-secondary);text-decoration:none;padding:8px 0;transition:all var(--transition-base)}.landing-nav-link:hover{color:var(--text-primary);text-decoration:underline}.landing-nav-link .auth-indicator{display:inline-block;width:8px;height:8px;background-color:var(--success);border-radius:50%;margin-right:6px;vertical-align:middle}.landing-main{position:relative;z-index:10;flex:1;display:flex;align-items:center;gap:64px;padding:0 64px 40px;min-height:0}.landing-hero{flex:1;max-width:480px;padding-top:80px;animation:fadeIn .5s ease-out}.landing-hero h1{font-size:clamp(2rem,4vw,2.75rem);font-weight:600;letter-spacing:-.03em;margin-bottom:14px;color:var(--text-primary);line-height:1.1}.landing-hero p{font-size:clamp(.95rem,1.5vw,1.0625rem);color:var(--text-secondary);line-height:1.6;margin-bottom:28px}.landing-cta{padding:14px 32px;font-size:15px;font-weight:500;font-family:var(--font-sans);border-radius:10px;background:var(--text-primary);color:var(--bg-primary);border:none;cursor:pointer;transition:all .2s ease;box-shadow:0 2px 8px #00000014;text-decoration:none}.landing-cta:hover{transform:translateY(-2px);box-shadow:0 6px 20px #0000001f}.landing-cta:active{transform:translateY(0)}.landing-video-container{flex:1.4;position:relative;border-radius:12px;overflow:hidden;background:#0a0a0a;box-shadow:0 4px 6px -1px #0000000d,0 16px 40px -8px #0000001f;border:1px solid var(--border-default);animation:fadeIn .6s ease-out .1s backwards;max-height:calc(100vh - 160px)}.landing-video{display:block;width:100%;height:100%;aspect-ratio:16 / 9;object-fit:cover;cursor:pointer}.landing-video-play{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:64px;height:64px;border-radius:50%;background:#fffffff2;border:none;cursor:pointer;display:flex;align-items:center;justify-content:center;color:var(--text-primary);transition:all .2s ease;box-shadow:0 4px 20px #0003}.landing-video-play:hover{transform:translate(-50%,-50%) scale(1.06);box-shadow:0 6px 28px #00000040}.landing-video-play svg{margin-left:2px}@media (max-width: 900px){.landing-main{flex-direction:column;padding:24px 24px 32px;gap:24px}.landing-hero{max-width:100%;text-align:center}.landing-video-container{width:100%;max-height:40vh}}.skeleton-box{background:linear-gradient(90deg,var(--bg-tertiary) 25%,var(--bg-secondary) 50%,var(--bg-tertiary) 75%);background-size:200% 100%;animation:skeleton-shimmer 1.5s ease-in-out infinite;border-radius:var(--radius-md)}@keyframes skeleton-shimmer{0%{background-position:200% 0}to{background-position:-200% 0}}.skeleton-sidebar{pointer-events:none}.skeleton-session-item{padding:var(--space-3) var(--space-4);border-radius:var(--radius-md)}.skeleton-avatar{width:32px;height:32px;border-radius:50%}.skeleton-main{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100%;padding:var(--space-8)}