* { box-sizing: border-box; font-family: system-ui, sans-serif; }
body { margin: 0; background: #faf9f7; color: #1c1c1c; }
#login, #chat { max-width: 720px; margin: 0 auto; padding: 24px; }
#messages { display: flex; flex-direction: column; gap: 12px; min-height: 50vh; }
.msg { padding: 10px 14px; border-radius: 12px; max-width: 80%; white-space: pre-wrap; }
.msg.user { align-self: flex-end; background: #d9eaff; }
.msg.bot { align-self: flex-start; background: #fff; border: 1px solid #eee; }
#dropzone { border: 2px dashed #ccc; border-radius: 10px; padding: 12px; text-align: center; color: #888; margin: 12px 0; }
#dropzone.over { border-color: #3a7; color: #3a7; }
#composer { display: flex; gap: 8px; }
#input { flex: 1; padding: 10px; border-radius: 10px; border: 1px solid #ccc; }
#input:focus, button:focus, #pwd:focus { outline: 2px solid #1c1c1c; outline-offset: 1px; }
button { padding: 10px 16px; border: 0; border-radius: 10px; background: #1c1c1c; color: #fff; cursor: pointer; }
.error { color: #a02a1d; }
#attachments { font-size: 13px; color: #555; }