:root{--bg-color:#0f172a;--sidebar-bg:rgba(30,41,59,.7);--chat-bg:rgba(15,23,42,.8);--primary-color:#3b82f6;--primary-hover:#2563eb;--text-primary:#f8fafc;--text-secondary:#94a3b8;--border-color:rgba(148,163,184,.1);--glass-border:1px solid hsla(0,0%,100%,.1);--glass-shadow:0 4px 30px rgba(0,0,0,.1)}body{margin:0;font-family:Inter,system-ui,-apple-system,sans-serif;background-color:var(--bg-color);color:var(--text-primary);overflow:hidden}.container{display:flex;height:100vh;width:100vw;background:radial-gradient(circle at top right,#1e293b 0,#0f172a 100%)}.sidebar{width:260px;background:var(--sidebar-bg);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-right:var(--glass-border);display:flex;flex-direction:column;padding:1rem;transition:transform .3s ease;z-index:10}.sidebar-header{margin-bottom:2rem;padding:.5rem;font-size:1.25rem;font-weight:700;color:var(--primary-color);text-transform:uppercase;letter-spacing:1px}.new-chat-btn,.sidebar-header{display:flex;align-items:center;gap:.5rem}.new-chat-btn{background:var(--primary-color);color:#fff;border:none;padding:.75rem;border-radius:8px;cursor:pointer;font-weight:600;justify-content:center;transition:background .2s;margin-bottom:1rem}.new-chat-btn:hover{background:var(--primary-hover)}.history-list{flex:1 1;overflow-y:auto;display:flex;flex-direction:column;gap:.5rem}.history-item{padding:.75rem;border-radius:6px;cursor:pointer;color:var(--text-secondary);transition:all .2s;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;font-size:.9rem}.history-item.active,.history-item:hover{background:hsla(0,0%,100%,.05);color:var(--text-primary)}.settings-area{margin-top:auto;padding-top:1rem;border-top:var(--glass-border)}.settings-btn{background:transparent;border:none;color:var(--text-secondary);cursor:pointer;display:flex;align-items:center;gap:.5rem;padding:.5rem;width:100%;border-radius:6px;transition:color .2s}.settings-btn:hover{color:var(--text-primary);background:hsla(0,0%,100%,.05)}.main-content{position:relative;background:rgba(15,23,42,.4)}.chat-window,.main-content{flex:1 1;display:flex;flex-direction:column}.chat-window{overflow-y:auto;padding:2rem;gap:1.5rem;scroll-behavior:smooth}.welcome-screen{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100%;color:var(--text-secondary);text-align:center}.welcome-screen h1{font-size:2.5rem;color:var(--text-primary);margin-bottom:1rem}.message-container{display:flex;gap:1rem;max-width:800px;margin:0 auto;width:100%}.message-container.user{justify-content:flex-end}.avatar{width:36px;height:36px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1.2rem;flex-shrink:0}.avatar.bot{background:linear-gradient(135deg,#3b82f6,#8b5cf6);color:#fff}.avatar.user{background:#475569;color:#fff}.message-content{padding:1rem 1.5rem;border-radius:12px;font-size:1rem;line-height:1.6;max-width:80%;box-shadow:0 2px 5px rgba(0,0,0,.1)}.message-content.bot{background:rgba(30,41,59,.6);-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px);border:var(--glass-border);border-top-left-radius:2px}.message-content.user{background:var(--primary-color);color:#fff;border-top-right-radius:2px}.message-content.bot code{background:rgba(0,0,0,.3);padding:.2rem .4rem;border-radius:4px;font-family:Fira Code,monospace;font-size:.9em}.message-content.bot pre{background:#0f172a;padding:1rem;border-radius:8px;overflow-x:auto;margin:.5rem 0;border:1px solid hsla(0,0%,100%,.1)}.message-content.bot pre code{background:transparent;padding:0}.message-content.bot p{margin:.5rem 0}.message-content.bot p:first-child{margin-top:0}.message-content.bot p:last-child{margin-bottom:0}.input-area-wrapper{padding:2rem;background:linear-gradient(to top,var(--bg-color) 20%,transparent)}.input-container{max-width:800px;margin:0 auto;position:relative;background:rgba(30,41,59,.8);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border:var(--glass-border);border-radius:12px;padding:.5rem;display:flex;align-items:flex-end;box-shadow:var(--glass-shadow)}.chat-input{flex:1 1;background:transparent;border:none;padding:1rem;color:var(--text-primary);font-size:1rem;resize:none;max-height:200px;font-family:inherit}.chat-input:focus{outline:none}.send-btn{background:var(--primary-color);color:#fff;border:none;border-radius:8px;width:40px;height:40px;display:flex;align-items:center;justify-content:center;cursor:pointer;margin:.5rem;transition:transform .2s,background .2s}.send-btn:hover:not(:disabled){background:var(--primary-hover);transform:scale(1.05)}.send-btn:disabled{background:#475569;cursor:not-allowed;opacity:.7}::-webkit-scrollbar{width:8px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:#475569;border-radius:4px}::-webkit-scrollbar-thumb:hover{background:#64748b}@media (max-width:768px){.sidebar{position:absolute;height:100%;transform:translateX(-100%)}.sidebar.open{transform:translateX(0)}.chat-window{padding:1rem}.message-content{max-width:90%}.input-area-wrapper{padding:1rem}}