:root{--bg: #0f1117;--surface: #181b24;--border: #262b38;--text: #e7e9ee;--muted: #9aa3b2;--accent: #7c9cff;--accent-hover: #9db3ff;--radius: 10px;--maxw: 960px;--font: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif}*{box-sizing:border-box}html{color-scheme:dark}body{margin:0;font-family:var(--font);background:var(--bg);color:var(--text);line-height:1.6}a{color:var(--accent);text-decoration:none}a:hover{color:var(--accent-hover)}.container{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 1.25rem}.site-header{border-bottom:1px solid var(--border);background:#0f1117d9;backdrop-filter:blur(8px);position:sticky;top:0;z-index:10;transition:transform .3s ease}.site-header.header-hidden{transform:translateY(-100%)}.site-header .container{display:flex;align-items:center;justify-content:space-between;height:60px;position:relative}.brand{font-weight:700;font-size:1.05rem;color:var(--text);white-space:nowrap}.brand span{color:var(--accent)}.nav-links{display:flex;align-items:center;gap:1.25rem}.nav-links a{color:var(--muted);font-size:.95rem}.nav-links a:hover{color:var(--text)}.nav-toggle{display:none;flex-direction:column;justify-content:center;gap:5px;width:36px;height:36px;padding:6px;background:transparent;border:none;cursor:pointer}.nav-toggle span{display:block;height:2px;width:100%;background:var(--text);border-radius:2px}@media(max-width:640px){.nav-toggle{display:flex}.nav-links{display:none;position:absolute;top:60px;right:0;left:0;flex-direction:column;align-items:stretch;gap:.25rem;padding:.75rem 1.25rem 1rem;background:var(--surface);border-bottom:1px solid var(--border)}.nav-links.open{display:flex}.nav-links a,.nav-links form,.nav-links .btn{width:100%}.nav-links a{padding:.5rem 0}.nav-links .btn{text-align:center}}.btn{display:inline-block;padding:.5rem 1rem;border-radius:var(--radius);font-size:.95rem;font-weight:600;cursor:pointer;border:1px solid var(--border);background:var(--surface);color:var(--text)}.btn-primary{background:var(--accent);border-color:var(--accent);color:#0f1117}.btn-primary:hover{background:var(--accent-hover);color:#0f1117}.auth-card{max-width:26rem;margin:3rem auto;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:2rem}.auth-card h1{margin:0 0 1.5rem;font-size:1.5rem}.field{margin-bottom:1rem}.field label{display:block;margin-bottom:.35rem;font-size:.9rem;color:var(--muted)}.field input{width:100%;padding:.6rem .75rem;border-radius:var(--radius);border:1px solid var(--border);background:var(--bg);color:var(--text);font-size:1rem}.field input:focus{outline:2px solid var(--accent);outline-offset:0;border-color:var(--accent)}.form-error{background:#ff63631f;border:1px solid rgba(255,99,99,.4);color:#ff9b9b;padding:.6rem .85rem;border-radius:var(--radius);font-size:.9rem;margin-bottom:1rem}.auth-card .btn-primary{width:100%;margin-top:.5rem}.auth-alt{margin-top:1.25rem;text-align:center;color:var(--muted);font-size:.9rem}.conv-list{list-style:none;padding:0;margin:1.5rem 0;display:grid;gap:.75rem}.conv-item{border:1px solid var(--border);border-radius:var(--radius);background:var(--surface);padding:1rem 1.25rem}.conv-item h3{margin:0 0 .35rem;font-size:1.05rem}.conv-meta{color:var(--muted);font-size:.85rem;display:flex;gap:.75rem;flex-wrap:wrap;align-items:center}.badge{display:inline-block;padding:.1rem .5rem;border-radius:999px;font-size:.75rem;border:1px solid var(--border);background:var(--bg);color:var(--muted)}.badge-private{color:#ffcaa8;border-color:#ffa06466}.share-link{display:inline-flex;align-items:center;color:var(--muted)}.share-link:hover{color:var(--accent)}.chat{display:grid;gap:.85rem;margin:1.5rem 0}.msg{border-radius:var(--radius);padding:.75rem 1rem;max-width:85%;white-space:pre-wrap;word-wrap:break-word}.msg-user{background:#1d2433;border:1px solid var(--border);justify-self:end}.msg-assistant{background:var(--surface);border:1px solid var(--border);justify-self:start}@media(max-width:640px){.msg{max-width:94%}}.site-footer{border-top:1px solid var(--border);margin-top:4rem;padding:2rem 0;color:var(--muted);font-size:.9rem}