:root{--bg-primary:#f7f5ff;--bg-secondary:#f0eef8;--bg-tertiary:#e8e5f3;--text-primary:#1a1035;--text-secondary:#6b6280;--text-tertiary:#9b93af;--border-color:#e0dced;--accent-color:#7c3aed;--accent-hover:#6d28d9;--accent-pink:#ec4899;--gradient-primary:linear-gradient(135deg,#7c3aed,#ec4899);--gradient-primary-hover:linear-gradient(135deg,#6d28d9,#db2777);--user-bubble:linear-gradient(135deg,#7c3aed,#ec4899);--user-bubble-text:#fff;--assistant-bubble:#f0f0f5;--assistant-bubble-text:#1a1035;--sidebar-bg:#f0eef8;--sidebar-hover:#e0dced;--sidebar-active:#e0d4f7;--danger:#ef4444;--danger-hover:#dc2626;--shadow-sm:0 1px 3px rgba(124,58,237,.08);--shadow-md:0 4px 12px rgba(124,58,237,.12);--radius-sm:0.375rem;--radius-md:0.5rem;--radius-lg:1rem;--radius-xl:1.25rem;--max-chat-width:768px;--safe-bottom:env(safe-area-inset-bottom,0px);--safe-top:env(safe-area-inset-top,0px)}*{box-sizing:border-box;margin:0;padding:0}body,html{height:100%;height:-webkit-fill-available;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;background-color:var(--bg-primary);color:var(--text-primary);line-height:1.5;overflow:hidden;-webkit-text-size-adjust:100%}a{color:var(--accent-color);text-decoration:none}a:hover{text-decoration:underline}button{font-size:inherit;cursor:pointer;-webkit-tap-highlight-color:transparent}button,textarea{font-family:inherit}textarea{font-size:16px}@keyframes messageFadeIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.message-bubble{animation:messageFadeIn .3s ease-out forwards}.user-bubble{background:var(--user-bubble);color:var(--user-bubble-text);border-radius:var(--radius-xl) var(--radius-xl) var(--radius-sm) var(--radius-xl);box-shadow:0 2px 12px rgba(124,58,237,.2)}.assistant-bubble{background:var(--assistant-bubble);color:var(--assistant-bubble-text);border-radius:var(--radius-xl) var(--radius-xl) var(--radius-xl) var(--radius-sm);box-shadow:var(--shadow-sm)}.gradient-text{background:var(--gradient-primary);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.send-btn{background:var(--gradient-primary);color:#fff;border:none;border-radius:var(--radius-lg);padding:.75rem 1.25rem;font-weight:500;transition:opacity .2s ease,transform .15s ease;min-height:44px;min-width:44px;display:flex;align-items:center;justify-content:center}.send-btn:hover:not(:disabled){opacity:.9}.send-btn:active:not(:disabled){transform:scale(.96)}.send-btn:disabled{opacity:.4;cursor:not-allowed}.chat-container{height:100vh;display:flex;flex-direction:column;position:relative}.chat-main{flex:1 1;display:flex;flex-direction:column;overflow:hidden;min-width:0}@media (min-width:769px){.chat-container{flex-direction:row}.chat-header .menu-btn{display:none}}.sidebar{width:280px;background-color:var(--sidebar-bg);border-right:1px solid var(--border-color);display:flex;flex-direction:column;flex-shrink:0;transition:transform .25s ease}.sidebar-overlay{display:none}@media (max-width:768px){.sidebar{position:fixed;top:0;left:0;bottom:0;width:85%;max-width:320px;z-index:200;transform:translateX(-100%)}.sidebar.open{transform:translateX(0)}.sidebar-overlay{display:block;position:fixed;inset:0;background:rgba(26,16,53,.4);z-index:199;opacity:0;pointer-events:none;transition:opacity .25s ease}.sidebar-overlay.visible{opacity:1;pointer-events:auto}}.new-convo-btn{background:var(--gradient-primary);color:#fff;border:none;border-radius:var(--radius-md);padding:.625rem 1rem;font-size:.9375rem;font-weight:500;width:100%;transition:opacity .2s ease;min-height:44px}.new-convo-btn:hover{opacity:.9}.convo-item{display:flex;align-items:center;padding:.625rem .75rem;margin-bottom:.25rem;border-radius:var(--radius-md);cursor:pointer;transition:background-color .15s;min-height:44px;-webkit-tap-highlight-color:transparent}.convo-item:hover{background-color:var(--sidebar-hover)}.convo-item.active{background-color:var(--sidebar-active)}.convo-item .delete-btn{background:none;border:none;color:var(--text-tertiary);font-size:1rem;padding:.375rem;flex-shrink:0;min-width:32px;min-height:32px;display:flex;align-items:center;justify-content:center;border-radius:var(--radius-sm)}.convo-item .delete-btn:hover{background:rgba(239,68,68,.1);color:var(--danger)}.chat-header{display:flex;align-items:center;padding:.625rem .75rem;padding-top:calc(.625rem + var(--safe-top));border-bottom:1px solid var(--border-color);background-color:var(--bg-secondary);min-height:52px;gap:.75rem}.chat-header .menu-btn{background:none;border:none;color:var(--text-secondary);font-size:1.25rem;padding:.375rem;min-width:44px;min-height:44px;display:flex;align-items:center;justify-content:center;border-radius:var(--radius-md);-webkit-tap-highlight-color:transparent}.chat-header .menu-btn:hover{background:var(--bg-tertiary)}.messages-area{flex:1 1;overflow-y:auto;-webkit-overflow-scrolling:touch;overscroll-behavior:contain;padding:.75rem}@media (min-width:769px){.messages-area{padding:1rem}}.input-area{padding:.625rem .75rem;padding-bottom:calc(.625rem + var(--safe-bottom));border-top:1px solid var(--border-color);background-color:var(--bg-secondary)}.input-row{max-width:var(--max-chat-width);margin:0 auto;display:flex;gap:.5rem;align-items:flex-end}.input-row textarea{flex:1 1;padding:.625rem .875rem;border:1.5px solid var(--border-color);border-radius:var(--radius-lg);background-color:#fff;color:var(--text-primary);resize:none;outline:none;line-height:1.5;max-height:120px;overflow-y:auto;transition:border-color .2s ease;min-height:44px}.input-row textarea:focus{border-color:var(--accent-color)}.login-container{min-height:100vh;min-height:-webkit-fill-available;display:flex;justify-content:center;align-items:center;background:linear-gradient(135deg,#ede9fe,#fce7f3 50%,#f7f5ff);padding:1rem}.login-card{text-align:center;background:hsla(0,0%,100%,.85);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);padding:2.5rem 2rem;border-radius:20px;box-shadow:0 8px 32px rgba(124,58,237,.12);max-width:400px;width:100%;border:1px solid rgba(124,58,237,.1)}.login-title{font-size:1.5rem;font-weight:700;margin-bottom:.25rem}.login-subtitle{color:var(--text-secondary);font-size:.9375rem;margin-bottom:1.5rem}@keyframes dotPulse{0%,80%,to{opacity:.3}40%{opacity:1}}.thinking-dot{display:inline-block;width:7px;height:7px;border-radius:50%;background:var(--text-tertiary);margin:0 2px}.thinking-dot:first-child{animation:dotPulse 1.2s 0s infinite}.thinking-dot:nth-child(2){animation:dotPulse 1.2s .2s infinite}.thinking-dot:nth-child(3){animation:dotPulse 1.2s .4s infinite}.empty-state{flex:1 1;display:flex;flex-direction:column;align-items:center;justify-content:center;color:var(--text-tertiary);padding:2rem;text-align:center}.empty-state p{font-size:1rem}@media (max-width:768px){.empty-state p{font-size:.9375rem}}