:root{--color-bg-light: #f7f8fa;--color-bg-dark: #bedee3;--color-navbar-light: #fff;--color-navbar-dark: #23272f;--color-sidebar-light: #fff;--color-sidebar-dark: #23272f;--color-text-light: #23272f;--color-text-dark: #f7f8fa;--color-bubble-user-light: #e3e8ef;--color-bubble-user-dark: #293040;--color-bubble-bot-light: #f4f6fb;--color-bubble-bot-dark: #22262d;--color-border-light: #e5e7eb;--color-border-dark: #23272f;--color-primary: #f0f6ff;--color-purple: #faf5ff;--color-blue: #d9f1fc;--color-muted-text-light: #d8dce3;--color-muted-text-dark: #cbd0d6;--color-input-bg-light: #f5f7f9;--color-input-bg-dark: #61656c;--shadow-light: 0 2px 12px #e5e7eb;--shadow-dark: 0 2px 12px #23272f;--shadow-subtle: 0 1px 4px rgba(30, 41, 59, .06)}[data-theme=dark]{--background: var(--color-bg-dark);--navbar-bg: var(--color-navbar-dark);--sidebar-bg: var(--color-sidebar-dark);--text-color: var(--color-text-dark);--bubble-user-bg: var(--color-bubble-user-dark);--bubble-bot-bg: var(--color-bubble-bot-dark);--border-color: var(--color-border-dark);--muted-text: var(--color-muted-text-dark);--input-bg: var(--color-input-bg-dark);--shadow: var(--shadow-dark)}[data-theme=light]{--background: var(--color-bg-light);--navbar-bg: var(--color-navbar-light);--sidebar-bg: var(--color-sidebar-light);--text-color: var(--color-text-light);--bubble-user-bg: var(--color-bubble-user-light);--bubble-bot-bg: var(--color-bubble-bot-light);--border-color: var(--color-border-light);--muted-text: var(--color-muted-text-light);--input-bg: var(--color-input-bg-light);--shadow: var(--shadow-light)}body{font-family:Inter,Roboto,Arial,sans-serif;background:var(--background);color:var(--text-color);margin:0;padding:0;transition:background .25s ease,color .25s ease}.navbar{background:var(--navbar-bg);color:var(--text-color);font-size:1.3rem;border-bottom:1px solid var(--color-purple);padding:1rem 2rem;position:sticky;top:0;z-index:10;display:flex;justify-content:space-between;align-items:center}.sidebar{width:220px;height:100vh;background:var(--sidebar-bg);color:var(--text-color);border-right:1.5px solid var(--color-primary);box-shadow:var(--shadow);padding-top:36px;display:flex;flex-direction:column;-webkit-user-select:none;user-select:none;position:sticky;top:0}.sidebar-item .icon{font-size:24px;margin-right:16px;line-height:1}.animated-bg{position:fixed;top:0;right:0;bottom:0;left:0;z-index:0;overflow:hidden;pointer-events:none;background:linear-gradient(120deg,var(--color-purple),var(--color-blue),var(--background));background-size:400% 400%;animation:gradient-animate 16s ease-in-out infinite;filter:blur(2px)}@keyframes gradient-animate{0%{background-position:0% 50%}50%{background-position:100% 50%}to{background-position:0% 50%}}.navbar{background:var(--navbar-bg);color:var(--text-color);font-size:1.3rem;border-bottom:1px solid var(--color-purple);padding:1rem 2rem;position:sticky;top:0;z-index:10;display:flex;align-items:center;justify-content:space-between}.logo{font-weight:700;letter-spacing:.08em;color:var(--color-purple)}.nav-links{display:flex;gap:2rem;align-items:center}.nav-links a{color:inherit;text-decoration:none;font-size:1.08rem;font-weight:500;padding:6px 8px;border-radius:6px;transition:background .18s,color .18s;letter-spacing:.01em}.nav-links a:hover,.nav-links a:focus{background:linear-gradient(90deg,var(--color-purple),var(--color-blue));color:#75a1ff}.sidebar{width:220px;min-height:100vh;background:var(--sidebar-bg);color:var(--text-color);border-right:1.5px solid var(--color-primary);box-shadow:var(--shadow);padding-top:36px;display:flex;flex-direction:column;-webkit-user-select:none;user-select:none}.sidebar-item{display:flex;align-items:center;padding:14px 28px;cursor:pointer;color:var(--color-primary);font-weight:600;font-size:1.1rem;border-radius:12px;margin-bottom:16px;transition:background .25s ease,color .25s ease}.sidebar-item:hover,.sidebar-item:focus{background:linear-gradient(90deg,var(--color-purple),var(--color-blue));color:#fff;outline:none}.sidebar-item span.icon{font-size:24px;margin-right:16px;line-height:1}.main-content{flex:1;display:flex;justify-content:center;align-items:flex-start;padding:2rem 1rem;position:relative;z-index:2}.chat-container{width:100%;max-width:1000px;background:var(--background);border-radius:16px;box-shadow:var(--shadow-subtle);display:flex;flex-direction:column;height:100vh;min-height:600px;color:var(--text-color);position:relative;z-index:2;overflow:hidden}.chat-messages{flex:1;overflow-y:auto;padding:1.2rem 1.5rem;display:flex;flex-direction:column;gap:.8rem;background:transparent;scroll-behavior:smooth}.chat-bubble{border-radius:16px;padding:10px 15px;max-width:100%;font-size:16px;line-height:1.5;margin-bottom:12px;box-shadow:var(--shadow);font-family:Inter,Roboto,sans-serif;letter-spacing:.1px;word-break:break-word;position:relative;-webkit-user-select:text;user-select:text;transition:background-color .25s ease,color .25s ease}.chat-bubble.bot{background:var(--bubble-bot-bg);color:var(--text-color);align-self:flex-start;box-shadow:0 4px 12px #a259fe4d}.chat-bubble.user{background:var(--bubble-user-bg);color:var(--text-color);align-self:flex-end;box-shadow:0 4px 12px #4fc3f74d}.chat-bubble .timestamp{font-size:12px;color:var(--muted-text);margin-top:6px;text-align:right;-webkit-user-select:none;user-select:none}.chat-input-bar{position:sticky;bottom:0;background:var(--background);border-top:1px solid var(--border-color);padding:18px 24px;display:flex;align-items:center;z-index:5}.chat-input-box{flex:1;padding:14px 20px;border-radius:24px;border:1.5px solid var(--border-color);background:var(--input-bg);color:var(--text-color);font-size:16px;outline:none;font-family:Inter,Roboto,sans-serif;transition:background-color .25s ease,color .25s ease}.chat-input-box::placeholder{color:var(--muted-text)}.send-btn{background:var(--color-primary);color:#fff;border:none;border-radius:24px;width:48px;height:48px;cursor:pointer;margin-left:12px;font-size:18px;display:flex;align-items:center;justify-content:center;transition:background-color .25s ease}.send-btn:disabled{background:#b0b8c9;cursor:not-allowed}.send-btn:hover:not(:disabled){background:var(--color-purple)}.typing-dot{width:6px;height:6px;background:var(--color-primary);border-radius:50%;display:inline-block;margin-right:2px;animation:blink 1.4s infinite both}.typing-dot:nth-child(2){animation-delay:.2s}.typing-dot:nth-child(3){animation-delay:.4s}@keyframes blink{0%,80%,to{opacity:.3}40%{opacity:1}}@media (max-width: 600px){.main-content{padding:1rem .5rem}.sidebar{width:60px;padding-top:16px}.sidebar-item{padding:12px 10px;font-size:0;justify-content:center}.sidebar-item span.icon{margin:0}.chat-container{max-width:100vw;border-radius:0;height:80vh}}