:root {
  --bg: #0f1117;
  --panel: #171a23;
  --panel-2: #1f2430;
  --text: #e7e9ee;
  --muted: #9aa3b2;
  --accent: #4f8cff;
  --border: #2a2f3a;
  --err: #ff6b6b;
}
* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body {
  display: flex;
  flex-direction: column;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif;
  font-size: 15px;
}

/* Topbar */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 14px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}
.brand { font-weight: 700; letter-spacing: .02em; }
.controls { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.ctrl { display: flex; flex-direction: column; font-size: 11px; color: var(--muted); }
.ctrl select {
  margin-top: 2px;
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 8px;
  font-size: 14px;
}
.ghost {
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 10px;
  cursor: pointer;
}

/* Key panel */
.key-panel {
  background: var(--panel-2);
  border-bottom: 1px solid var(--border);
  padding: 10px 14px;
}
.key-panel .hint { margin: 0 0 8px; color: var(--muted); font-size: 12px; }
.key-row { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.key-row span { font-size: 12px; color: var(--accent); min-width: 110px; }
.key-row input {
  flex: 1; min-width: 200px;
  background: var(--bg); color: var(--text);
  border: 1px solid var(--border); border-radius: 8px; padding: 8px 10px;
}
.key-row button, .composer button, .key-save {
  background: var(--accent); color: #fff; border: 0;
  border-radius: 8px; padding: 9px 16px; cursor: pointer; font-weight: 600;
}

/* Uploader */
.uploader { padding: 10px 14px; border-bottom: 1px solid var(--border); }
.upload-label {
  display: inline-block; cursor: pointer; color: var(--accent);
  border: 1px dashed var(--border); border-radius: 8px; padding: 8px 12px; font-size: 14px;
}
.doc-list { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 8px; }
.doc-chip {
  background: var(--panel-2); border: 1px solid var(--border); border-radius: 999px;
  padding: 4px 10px; font-size: 12px;
}
.doc-chip em { color: var(--muted); font-style: normal; margin-left: 4px; }
.doc-chip.err { border-color: var(--err); color: var(--err); }

/* Messages */
.messages { flex: 1; overflow-y: auto; padding: 16px; display: flex; flex-direction: column; gap: 12px; }
.msg { display: flex; }
.msg.user { justify-content: flex-end; }
.msg .bubble {
  max-width: min(80%, 720px); padding: 10px 14px; border-radius: 14px;
  white-space: pre-wrap; word-break: break-word; line-height: 1.6;
}
.msg.user .bubble { background: var(--accent); color: #fff; border-bottom-right-radius: 4px; }
.msg.assistant .bubble { background: var(--panel-2); border: 1px solid var(--border); border-bottom-left-radius: 4px; }
.msg.err .bubble { border-color: var(--err); color: var(--err); }

/* Composer */
.composer {
  display: flex; gap: 8px; padding: 12px 14px;
  background: var(--panel); border-top: 1px solid var(--border);
}
.composer textarea {
  flex: 1; resize: none; background: var(--bg); color: var(--text);
  border: 1px solid var(--border); border-radius: 10px; padding: 10px 12px;
  font-family: inherit; font-size: 15px; line-height: 1.5; max-height: 160px;
}
.composer button[disabled] { opacity: .5; cursor: default; }

/* Toast */
#toast {
  position: fixed; left: 50%; bottom: 80px; transform: translateX(-50%) translateY(20px);
  background: #000; color: #fff; padding: 10px 16px; border-radius: 10px;
  opacity: 0; pointer-events: none; transition: all .2s; font-size: 13px;
}
#toast.show { opacity: .92; transform: translateX(-50%) translateY(0); }

/* Uploader row */
.uploader-row { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
#url-input {
  flex: 1; min-width: 220px;
  background: var(--bg); color: var(--text);
  border: 1px solid var(--border); border-radius: 8px; padding: 8px 10px;
}
#url-btn { background: var(--accent); color: #fff; border: 0; border-radius: 8px; padding: 9px 14px; cursor: pointer; font-weight: 600; }
#url-btn[disabled] { opacity: .6; cursor: default; }
.doc-head { margin-top: 10px; font-size: 12px; color: var(--muted); }

/* Settings modal */
.modal { position: fixed; inset: 0; z-index: 50; display: flex; align-items: center; justify-content: center; }
.modal-backdrop { position: absolute; inset: 0; background: rgba(0,0,0,.55); }
.modal-card {
  position: relative; z-index: 1; width: min(560px, 92vw); max-height: 88vh; overflow-y: auto;
  background: var(--panel); border: 1px solid var(--border); border-radius: 14px; padding: 18px;
}
.modal-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 8px; }
.modal-head h3 { margin: 0; }
.field { display: flex; flex-direction: column; gap: 6px; margin: 14px 0; }
.field > span { font-size: 13px; color: var(--muted); }
.field select, .field textarea, #key-input {
  background: var(--bg); color: var(--text);
  border: 1px solid var(--border); border-radius: 8px; padding: 9px 10px;
  font-family: inherit; font-size: 14px;
}
.field textarea { resize: vertical; }
.self-start { align-self: flex-start; background: var(--accent); color: #fff; border: 0; border-radius: 8px; padding: 8px 14px; cursor: pointer; }
.field .hint { margin: 4px 0 0; font-size: 12px; color: var(--muted); }

.auth { display: flex; align-items: center; gap: 8px; }
.user-info { font-size: 12px; color: var(--muted); max-width: 160px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.muted-note { font-size: 11px; color: var(--muted); }

.hidden { display: none !important; }

@media (max-width: 600px) {
  .ctrl span { display: none; }
  .msg .bubble { max-width: 92%; }
}