:root {
  --bg: #0f1115;
  --panel: #171a21;
  --border: #2a2f3a;
  --text: #e6e8ec;
  --muted: #9aa3af;
  --accent: #4f8cff;
  --danger: #ff6b6b;
  --ok: #52c974;
  font-family: -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  padding: 12px 20px;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

header h1 { font-size: 16px; margin: 0; font-weight: 600; }
header a { color: var(--muted); font-size: 13px; text-decoration: none; }

#login-screen {
  max-width: 360px;
  margin: 15vh auto;
  padding: 24px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
}
#login-screen h2 { margin-top: 0; font-size: 18px; }
#login-screen input {
  width: 100%; padding: 10px; margin: 8px 0; border-radius: 8px;
  border: 1px solid var(--border); background: #10131a; color: var(--text);
}
#login-screen button, .btn {
  padding: 10px 16px; border-radius: 8px; border: none;
  background: var(--accent); color: white; cursor: pointer; font-size: 14px;
}
#login-error { color: var(--danger); font-size: 13px; min-height: 18px; }

main { flex: 1; overflow-y: auto; padding: 20px; max-width: 820px; margin: 0 auto; width: 100%; }

.msg { margin-bottom: 20px; }
.msg.user { text-align: right; }
.msg.user .bubble { background: var(--accent); display: inline-block; padding: 10px 14px; border-radius: 12px 12px 2px 12px; max-width: 80%; text-align: left; }
.msg.assistant .bubble { background: var(--panel); border: 1px solid var(--border); padding: 12px 16px; border-radius: 12px 12px 12px 2px; white-space: pre-wrap; line-height: 1.5; }
.msg .tool-tag { font-size: 11px; color: var(--muted); margin-bottom: 4px; display: block; }

.sources { margin-top: 10px; display: flex; flex-wrap: wrap; gap: 8px; }
.source-card { border: 1px solid var(--border); border-radius: 8px; padding: 6px 10px; font-size: 12px; color: var(--muted); cursor: pointer; }
.source-card:hover { border-color: var(--accent); color: var(--text); }

.candidates { margin-top: 10px; display: flex; flex-direction: column; gap: 6px; }
.candidate-btn {
  text-align: left; padding: 8px 12px; border-radius: 8px; border: 1px solid var(--border);
  background: #10131a; color: var(--text); cursor: pointer; font-size: 13px;
}
.candidate-btn:hover { border-color: var(--accent); }

.feedback { margin-top: 8px; display: flex; gap: 6px; }
.feedback button { background: none; border: 1px solid var(--border); border-radius: 6px; padding: 4px 8px; cursor: pointer; color: var(--muted); }
.feedback button.active-up { border-color: var(--ok); color: var(--ok); }
.feedback button.active-down { border-color: var(--danger); color: var(--danger); }

footer {
  border-top: 1px solid var(--border);
  padding: 14px 20px;
  display: flex;
  gap: 8px;
  max-width: 820px;
  margin: 0 auto;
  width: 100%;
}
footer input[type=text] {
  flex: 1; padding: 12px; border-radius: 8px; border: 1px solid var(--border);
  background: var(--panel); color: var(--text); font-size: 14px;
}
footer label.upload-btn {
  padding: 12px; border-radius: 8px; border: 1px solid var(--border);
  background: var(--panel); color: var(--muted); cursor: pointer; font-size: 13px; display: flex; align-items: center;
}
#upload-badge { font-size: 12px; color: var(--ok); align-self: center; margin-right: 4px; }

.modal-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.7);
  display: flex; align-items: center; justify-content: center; z-index: 50;
}
.modal-overlay img { max-width: 90vw; max-height: 90vh; border-radius: 8px; }

.hidden { display: none !important; }