:root{--bg: #f8f7f4;--panel: #ffffff;--border: #d7d4cd;--text: #1b1b1b;--muted: #6f6a64;--accent: #2f6bff;--accent-soft: #e7edff;--shadow: 0 18px 40px rgba(20, 17, 12, .12);--radius: 18px;--logo-bg: #fdfdfb}*{box-sizing:border-box}body{margin:0;font-family:Palatino Linotype,Book Antiqua,Palatino,Georgia,serif;color:var(--text);background:repeating-linear-gradient(135deg,#ffffff59 0,#ffffff59 6px,#f8f5ef99 6px,#f8f5ef99 12px),radial-gradient(600px 420px at 10% 5%,rgba(255,198,122,.12),transparent 65%),radial-gradient(700px 520px at 85% 15%,rgba(47,107,255,.12),transparent 70%),var(--bg);min-height:100vh}.login-screen{top:0;right:0;bottom:0;left:0;display:grid;place-items:center;position:fixed;background:repeating-linear-gradient(135deg,#ffffff59 0,#ffffff59 6px,#f8f5ef99 6px,#f8f5ef99 12px),radial-gradient(600px 420px at 10% 5%,rgba(255,198,122,.12),transparent 65%),radial-gradient(700px 520px at 85% 15%,rgba(47,107,255,.12),transparent 70%),var(--bg);z-index:10;overflow:hidden}.login-screen:before{content:"";position:absolute;top:0;right:0;bottom:0;left:0;background:radial-gradient(700px 400px at 75% -10%,rgba(47,107,255,.15),transparent 60%),radial-gradient(500px 380px at 20% 10%,rgba(255,178,64,.18),transparent 60%),linear-gradient(180deg,#ffffffe6,#fff0);pointer-events:none;z-index:0}.login-card{width:min(420px,90vw);background:#ffffffeb;border:1px solid rgba(215,212,205,.8);border-radius:16px;padding:28px 24px;box-shadow:var(--shadow);text-align:center;position:relative;z-index:1}.login-logo{width:360px;height:78px;object-fit:cover;object-position:center left;border-radius:8px;margin:0 auto 10px;display:block}.login-card h1{margin:0 0 8px;font-size:22px}.login-subtitle{margin:0 0 20px;color:var(--muted);font-size:14px}.login-form{display:grid;gap:10px;text-align:left}.login-form label{font-size:13px;color:var(--muted)}.login-form input{border:1px solid rgba(215,212,205,.9);border-radius:12px;padding:10px 12px;font-size:14px}.login-form input:focus{outline:2px solid var(--accent);outline-offset:2px}.login-form button{margin-top:6px;border:none;border-radius:12px;padding:12px 14px;background:linear-gradient(135deg,#1b4fd6,#2f6bff);color:#fff;cursor:pointer}.login-form button:hover{background:linear-gradient(135deg,#1746be,#2458db)}.login-error{min-height:18px;color:#b00020;font-size:12px}.app{opacity:1;transition:opacity .2s ease}body.logged-out .app{pointer-events:none;opacity:.25;filter:blur(1px)}body.logged-in .login-screen{display:none}.app:before{content:"";position:fixed;top:0;right:0;bottom:0;left:0;background:radial-gradient(700px 400px at 75% -10%,rgba(47,107,255,.15),transparent 60%),radial-gradient(500px 380px at 20% 10%,rgba(255,178,64,.18),transparent 60%),linear-gradient(180deg,#ffffffe6,#fff0);pointer-events:none;z-index:0}.app{display:flex;min-height:100vh;position:relative;z-index:1}.sidebar{width:260px;border-right:1px solid rgba(215,212,205,.7);padding:24px 18px;display:flex;flex-direction:column;gap:20px;background:var(--logo-bg);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}.logo{display:flex;align-items:center;justify-content:center;padding:6px;border-radius:12px;background:var(--logo-bg);border:none;box-shadow:none;overflow:hidden}.logo-img{width:210px;height:48px;border-radius:8px;object-fit:cover;object-position:center left;transform:scale(1.4);box-shadow:none}.menu{display:flex;flex-direction:column;gap:12px}.menu-item{color:var(--text);text-decoration:none;padding:10px 12px;border-radius:10px;border:1px solid transparent;background:transparent}.menu-item:focus,.menu-item:hover{border-color:#2f6bff4d;background:var(--accent-soft);outline:none}.logout-btn{border:none;background:transparent;color:var(--muted);padding:12px 2px 0;font-size:13px;cursor:pointer;text-align:left;align-self:flex-start;margin-top:auto}.logout-btn:hover,.logout-btn:focus{color:var(--text);outline:none}.section-header{font-size:13px;text-transform:uppercase;letter-spacing:.08em;color:var(--muted)}.conversation-item.new-chat-item{border:1px dashed rgba(215,212,205,.9);background:#fff9;font-weight:600;position:relative}.conversation-item.new-chat-item:hover,.conversation-item.new-chat-item:focus{border-color:#2f6bff59;box-shadow:0 0 0 2px #2f6bff1f}.conversation-list{border:1px solid rgba(215,212,205,.8);border-radius:12px;padding:6px;background:#ffffffd9;overflow-y:auto;min-height:160px;max-height:calc(100vh - 260px)}.conversation-item{padding:10px 12px;border-radius:10px;cursor:pointer;border:1px solid transparent;font-size:14px;display:flex;align-items:center;justify-content:space-between;gap:10px;transition:background .2s ease,border-color .2s ease,transform .2s ease}.conversation-item:hover,.conversation-item:focus{background:#f2f1ee;border-color:#2f6bff40;outline:none;transform:translateY(-1px)}.conversation-item.active{background:linear-gradient(135deg,#e7edffe6,#ffffffe6);border-color:#2f6bff73}.conversation-title{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.delete-btn{border:1px solid rgba(215,212,205,.8);background:#fff;color:var(--muted);border-radius:8px;padding:2px 8px;font-size:12px;cursor:pointer;opacity:0;pointer-events:none;transition:opacity .15s ease}.conversation-item:hover .delete-btn,.conversation-item:focus-within .delete-btn{opacity:1;pointer-events:auto}.delete-btn:hover,.delete-btn:focus{color:#fff;background:#b00020;border-color:#b00020;outline:none}.main{flex:1;display:flex;align-items:center;justify-content:center;padding:24px;position:relative}.question-overlay{position:absolute;top:calc(50% - 10px);left:calc(50% - 20px);transform:translate(-50%,-50%);font-size:24px;letter-spacing:.01em;color:var(--text);pointer-events:none;transition:opacity .3s ease;z-index:2}.chat-card{width:100%;height:100%;background:#ffffffe6;border-radius:var(--radius);box-shadow:var(--shadow);border:1px solid rgba(215,212,205,.8);display:flex;flex-direction:column;min-height:100%;transition:width .6s cubic-bezier(.2,.9,.2,1.2),height .6s cubic-bezier(.2,.9,.2,1.2),min-height .6s cubic-bezier(.2,.9,.2,1.2),box-shadow .6s ease,transform .6s cubic-bezier(.2,.9,.2,1.2);transform-origin:center;position:relative}.chat-header{position:absolute;top:22px;left:24px;right:24px;text-align:center;pointer-events:none}.question{margin:0;font-size:24px;letter-spacing:.01em}.thread{flex:1;padding:18px 24px;display:flex;flex-direction:column;gap:12px;overflow-y:auto}.message{max-width:70%;padding:10px 12px;border-radius:14px;border:1px solid rgba(215,212,205,.8);background:#ffffffe6;font-size:15px;line-height:1.35;box-shadow:0 6px 12px #14110c0f}.message.user{align-self:flex-end;background:linear-gradient(135deg,#2f6bff,#1b4fd6);color:#fff;border-color:#2f6bffe6}.message.loading{animation:pulse 1.2s ease-in-out infinite}@keyframes pulse{50%{opacity:.6}}.composer{display:flex;gap:10px;padding:18px 24px 24px;border-top:1px solid rgba(215,212,205,.8);background:#fff9;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}.composer input{flex:1;border:1px solid rgba(215,212,205,.9);border-radius:14px;padding:12px 14px;font-size:15px;background:#fff}.composer input:focus,.composer button:focus,.conversation-item:focus{outline:2px solid var(--accent);outline-offset:2px}.composer button{border:none;border-radius:14px;padding:12px 18px;background:linear-gradient(135deg,#1b4fd6,#2f6bff);color:#fff;cursor:pointer;box-shadow:0 8px 16px #14110c26}.composer button:hover{background:linear-gradient(135deg,#1746be,#2458db)}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);border:0}body.chat-compact .chat-card{min-height:0;height:auto;transform:translateY(10px) scale(.985);padding-top:48px;width:min(760px,92%)}body.chat-compact .chat-header{opacity:0;transition:opacity .2s ease}body.chat-compact .question-overlay{opacity:1}body.chat-compact .thread{opacity:0;max-height:0;padding:0 24px;overflow:hidden;transition:opacity .6s ease,max-height .6s cubic-bezier(.2,.9,.2,1.2),padding .6s ease}body.chat-compact .composer{border-top:none;padding:20px 18px;justify-content:center}body.chat-compact .composer input{max-width:520px;padding:10px 12px;font-size:14px}body.chat-active .chat-card{height:80vh;min-height:540px;transform:translateY(0) scale(1);padding-top:0}body.chat-active .thread{min-height:0}body.chat-active .thread{opacity:1;max-height:1000px;padding:18px 24px}body.chat-active .chat-header{opacity:0;transition:opacity .4s ease}body.chat-active .question-overlay{opacity:0}@media (max-width: 900px){.app{flex-direction:column}.sidebar{width:100%;border-right:none;border-bottom:1px solid rgba(215,212,205,.7);max-height:240px}.conversation-list{max-height:140px}.question-overlay{left:50%}}