:root {
  --bg: #f4f6f9;
  --card: #ffffff;
  --primary: #1f8a5b;
  --primary-dark: #176b46;
  --text: #1c2530;
  --muted: #6b7785;
  --border: #e2e8f0;
  --danger: #d64545;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, "Hiragino Sans", "Yu Gothic", sans-serif;
  background: var(--bg);
  color: var(--text);
}
.hidden { display: none !important; }

/* ログイン */
.login-wrap {
  min-height: 100vh; display: flex; align-items: center; justify-content: center;
}
.login-card {
  background: var(--card); padding: 40px; border-radius: 14px;
  box-shadow: 0 10px 40px rgba(0,0,0,.08); width: 340px; text-align: center;
}
.login-card h1 { margin: 0 0 4px; font-size: 24px; color: var(--primary); }
.login-card .sub { margin: 0 0 24px; color: var(--muted); font-size: 14px; }
.login-card input {
  width: 100%; padding: 12px; margin-bottom: 12px; border: 1px solid var(--border);
  border-radius: 8px; font-size: 15px;
}
.login-card button {
  width: 100%; padding: 12px; background: var(--primary); color: #fff; border: none;
  border-radius: 8px; font-size: 15px; cursor: pointer; font-weight: 600;
}
.login-card button:hover { background: var(--primary-dark); }
.error { color: var(--danger); font-size: 13px; margin: 10px 0 0; }

/* トップバー */
.topbar {
  display: flex; justify-content: space-between; align-items: center;
  background: var(--card); padding: 14px 24px; border-bottom: 1px solid var(--border);
}
.brand { font-weight: 700; font-size: 17px; color: var(--primary); }
.user-area { display: flex; align-items: center; gap: 14px; font-size: 14px; color: var(--muted); }
button.ghost {
  background: none; border: 1px solid var(--border); padding: 6px 12px;
  border-radius: 6px; cursor: pointer; color: var(--text);
}
button.ghost:hover { background: var(--bg); }

/* タブ */
.tabs { display: flex; gap: 4px; padding: 16px 24px 0; }
.tab {
  background: none; border: none; padding: 10px 18px; font-size: 15px; cursor: pointer;
  color: var(--muted); border-bottom: 3px solid transparent;
}
.tab.active { color: var(--primary); border-bottom-color: var(--primary); font-weight: 600; }
.tab-panel { padding: 20px 24px; max-width: 960px; }

/* カード共通 */
.upload-card, .list-card, .chat-card {
  background: var(--card); border: 1px solid var(--border); border-radius: 12px;
  padding: 20px; margin-bottom: 20px;
}
h2 { font-size: 16px; margin: 0 0 12px; }
.hint { color: var(--muted); font-size: 13px; margin: 0 0 14px; }

/* アップロード */
.upload-row { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.visibility-select, .chat-controls label { font-size: 14px; color: var(--muted); }
select, input[type=file] {
  padding: 8px; border: 1px solid var(--border); border-radius: 8px; font-size: 14px;
}
#upload-btn, #chat-send {
  padding: 10px 20px; background: var(--primary); color: #fff; border: none;
  border-radius: 8px; cursor: pointer; font-weight: 600;
}
#upload-btn:hover, #chat-send:hover { background: var(--primary-dark); }
#upload-btn:disabled, #chat-send:disabled { opacity: .5; cursor: default; }
.upload-status { margin-top: 14px; font-size: 14px; }
.upload-status .ok { color: var(--primary); }
.upload-status .ng { color: var(--danger); }
.upload-status .row { padding: 4px 0; }

/* 文書テーブル */
.doc-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.doc-table th, .doc-table td {
  text-align: left; padding: 10px 8px; border-bottom: 1px solid var(--border);
}
.doc-table th { color: var(--muted); font-weight: 500; font-size: 13px; }
.badge { padding: 3px 9px; border-radius: 20px; font-size: 12px; cursor: pointer; }
.badge.internal { background: #eef2f7; color: #4a5568; }
.badge.public { background: #e3f5ec; color: var(--primary-dark); }
.count { color: var(--muted); font-weight: 400; font-size: 13px; }
.del-btn {
  background: none; border: none; color: var(--danger); cursor: pointer; font-size: 14px;
}
.empty { color: var(--muted); text-align: center; padding: 20px; }

/* チャット */
.chat-controls { margin-bottom: 14px; }
.chat-log {
  min-height: 320px; max-height: 56vh; overflow-y: auto; padding: 8px;
  display: flex; flex-direction: column; gap: 14px;
}
.msg { max-width: 80%; padding: 12px 16px; border-radius: 12px; font-size: 14px; line-height: 1.6; white-space: pre-wrap; }
.msg.user { align-self: flex-end; background: var(--primary); color: #fff; border-bottom-right-radius: 3px; }
.msg.assistant { align-self: flex-start; background: var(--bg); border-bottom-left-radius: 3px; }
.msg .sources { margin-top: 10px; padding-top: 8px; border-top: 1px solid var(--border); font-size: 12px; color: var(--muted); }
.msg.loading { color: var(--muted); }
.chat-input-row { display: flex; gap: 10px; margin-top: 14px; }
#chat-input { flex: 1; padding: 10px; border: 1px solid var(--border); border-radius: 8px; font-size: 14px; resize: vertical; font-family: inherit; }