* { box-sizing: border-box; }
body { margin: 0; display: flex; height: 100vh; font: 15px/1.5 system-ui, sans-serif; color: #1a1a1a; }
#sidebar { width: 240px; border-right: 1px solid #e5e5e5; padding: 12px; overflow-y: auto; background: #fafafa; }
#new-thread { width: 100%; padding: 8px; margin-bottom: 12px; cursor: pointer; border: 1px solid #ccc; border-radius: 8px; background: #fff; }
#threads { list-style: none; margin: 0; padding: 0; }
#threads li { padding: 8px; border-radius: 8px; cursor: pointer; font-size: 14px; }
#threads li.active { background: #eee; font-weight: 600; }
main { flex: 1; display: flex; flex-direction: column; }
#messages { flex: 1; overflow-y: auto; padding: 20px; }
.msg { max-width: 720px; margin: 0 auto 16px; padding: 10px 14px; border-radius: 12px; white-space: pre-wrap; }
.msg.user { background: #1e6fff; color: #fff; margin-left: auto; }
.msg.assistant { background: #f1f1f1; }
.card { max-width: 720px; margin: 0 auto 16px; border: 1px solid #d9d9d9; border-radius: 12px; padding: 16px; }
.card h3 { margin: 0 0 8px; }
.card table { width: 100%; border-collapse: collapse; font-size: 14px; }
.card td, .card th { padding: 4px 6px; border-bottom: 1px solid #eee; text-align: left; }
.card .totals { margin-top: 10px; text-align: right; }
.card .actions { margin-top: 12px; display: flex; gap: 8px; justify-content: flex-end; }
.card button { padding: 8px 16px; border-radius: 8px; cursor: pointer; border: none; }
.card .approve { background: #16a34a; color: #fff; }
.card .cancel { background: #eee; }
#composer { display: flex; gap: 8px; padding: 12px; border-top: 1px solid #e5e5e5; }
#composer textarea { flex: 1; resize: none; padding: 8px; border-radius: 8px; border: 1px solid #ccc; font: inherit; }
#composer button { padding: 0 18px; border-radius: 8px; border: none; background: #1e6fff; color: #fff; cursor: pointer; }

/* --- Auth --- */
.auth-body { display: flex; align-items: center; justify-content: center; background: #f4f5f7; }
.auth-card { background: #fff; border: 1px solid #e0e0e0; border-radius: 14px; padding: 28px; width: 340px; box-shadow: 0 8px 30px rgba(0,0,0,.06); }
.auth-card h2 { margin: 0 0 18px; }
.auth-card label { display: block; margin-bottom: 12px; font-size: 14px; }
.auth-card input { width: 100%; padding: 9px; margin-top: 4px; border: 1px solid #ccc; border-radius: 8px; font: inherit; }
.auth-card button { width: 100%; padding: 10px; border: none; border-radius: 8px; background: #1e6fff; color: #fff; cursor: pointer; font: inherit; }
.auth-error { color: #c0392b; font-size: 14px; min-height: 18px; margin: 8px 0 0; }
.hidden { display: none !important; }

#account { margin-top: 16px; padding-top: 12px; border-top: 1px solid #e5e5e5; font-size: 13px; display: flex; flex-direction: column; gap: 6px; }
#account-email { color: #666; word-break: break-all; }
#logout { padding: 6px; border: 1px solid #ccc; border-radius: 8px; background: #fff; cursor: pointer; }

.overlay { position: fixed; inset: 0; background: rgba(0,0,0,.45); display: flex; align-items: center; justify-content: center; z-index: 50; }
.overlay-card { background: #fff; border-radius: 14px; padding: 28px; width: 380px; max-height: 90vh; overflow-y: auto; }
.overlay-card h2 { margin: 0 0 10px; }
.overlay-card input { width: 100%; padding: 9px; margin: 6px 0; border: 1px solid #ccc; border-radius: 8px; font: inherit; }
.overlay-card button { padding: 9px 14px; border: none; border-radius: 8px; background: #16a34a; color: #fff; cursor: pointer; }
#twofa-qr { display: flex; justify-content: center; margin: 12px 0; }
#twofa-backup { background: #f5f5f5; padding: 10px; border-radius: 8px; font-size: 13px; }