:root{--bg: #f8fafc;--surface: #fff;--text: #0f172a;--muted: #64748b;--primary: #2563eb;--primary-hover: #1d4ed8;--border: #e2e8f0;--danger: #dc2626;--radius: 10px;--shadow: 0 1px 3px rgba(15, 23, 42, .08)}*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text);line-height:1.5}a{color:var(--primary)}button,.btn{font:inherit;cursor:pointer;border:none;border-radius:8px;padding:.55rem 1rem;background:var(--primary);color:#fff}button:hover,.btn:hover{background:var(--primary-hover)}button.secondary,.btn.secondary{background:var(--surface);color:var(--text);border:1px solid var(--border)}button:disabled{opacity:.55;cursor:not-allowed}input,textarea,select{font:inherit;width:100%;padding:.55rem .75rem;border:1px solid var(--border);border-radius:8px;background:var(--surface)}label{display:block;font-size:.875rem;font-weight:500;margin-bottom:.35rem}.field{margin-bottom:1rem}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:1.25rem;box-shadow:var(--shadow)}.error{color:var(--danger);font-size:.875rem;margin-top:.5rem}.success{color:#15803d;font-size:.875rem}.muted{color:var(--muted);font-size:.875rem}.progress-bar{height:8px;background:var(--border);border-radius:4px;overflow:hidden}.progress-bar>span{display:block;height:100%;background:var(--primary);transition:width .2s}.chat-box{display:flex;flex-direction:column;gap:.75rem;max-height:320px;overflow-y:auto;padding:.75rem;background:var(--bg);border-radius:8px}.chat-msg{padding:.5rem .75rem;border-radius:8px;max-width:85%;font-size:.9rem}.chat-msg.user{align-self:flex-end;background:#dbeafe}.chat-msg.bot{align-self:flex-start;background:var(--surface);border:1px solid var(--border)}@media(max-width:768px){.layout{flex-direction:column!important}.sidebar{width:100%!important;border-right:none!important;border-bottom:1px solid var(--border)}}