:root {
  --bg: #f5f6f8;
  --pane-bg: #ffffff;
  --border: #dde1e6;
  --text: #1f2328;
  --text-sub: #6a737d;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --user-bubble: #2563eb;
  --user-bubble-text: #ffffff;
  --assistant-bubble: #eef1f5;
  --ok: #16a34a;
  --ok-bg: #ecfdf3;
  --error: #dc2626;
  --error-bg: #fef2f2;
  --chip-bg: #eef2ff;
  --chip-text: #3730a3;
  --code-bg: #f6f8fa;
}

/* ダークテーマ変数。2ブロックは同一内容を維持すること:
   media側はJS適用前のフォールバック、[data-theme]側が切替ボタンの実体 */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme='light']) {
    --bg: #16181d;
    --pane-bg: #1e2127;
    --border: #33373f;
    --text: #e6e8eb;
    --text-sub: #9aa1ab;
    --accent: #3b82f6;
    --accent-hover: #60a5fa;
    --user-bubble: #2563eb;
    --user-bubble-text: #ffffff;
    --assistant-bubble: #2a2e36;
    --ok: #4ade80;
    --ok-bg: #12271a;
    --error: #f87171;
    --error-bg: #2c1a1a;
    --chip-bg: #26294a;
    --chip-text: #a5b4fc;
    --code-bg: #23262d;
  }
}

:root[data-theme='dark'] {
  --bg: #16181d;
  --pane-bg: #1e2127;
  --border: #33373f;
  --text: #e6e8eb;
  --text-sub: #9aa1ab;
  --accent: #3b82f6;
  --accent-hover: #60a5fa;
  --user-bubble: #2563eb;
  --user-bubble-text: #ffffff;
  --assistant-bubble: #2a2e36;
  --ok: #4ade80;
  --ok-bg: #12271a;
  --error: #f87171;
  --error-bg: #2c1a1a;
  --chip-bg: #26294a;
  --chip-text: #a5b4fc;
  --code-bg: #23262d;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Noto Sans JP", "Hiragino Sans", "Yu Gothic UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  height: 100vh;
  /* モバイルブラウザのアドレスバー伸縮に追従する */
  height: 100dvh;
  display: flex;
  flex-direction: column;
}

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  background: var(--pane-bg);
  border-bottom: 1px solid var(--border);
  gap: 12px;
}

.app-title {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.app-logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.app-logo svg { display: block; }

.app-title h1 {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
  white-space: nowrap;
}

.app-subtitle {
  font-size: 12px;
  color: var(--text-sub);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.app-actions { display: flex; gap: 8px; flex-shrink: 0; }

.btn {
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--pane-bg);
  color: var(--text);
  font-size: 13px;
  cursor: pointer;
  white-space: nowrap;
}

.btn:hover:not(:disabled) { border-color: var(--accent); color: var(--accent); }
.btn:disabled { opacity: 0.45; cursor: not-allowed; }

.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.btn-primary:hover:not(:disabled) { background: var(--accent-hover); color: #fff; }

.btn-sm { padding: 3px 10px; font-size: 12px; }

.btn-icon {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.btn-icon svg { display: block; }

.btn-ghost {
  border-color: transparent;
  background: transparent;
  padding: 6px 8px;
  color: var(--text-sub);
  display: inline-flex;
  align-items: center;
}
.btn-ghost:hover { color: var(--accent); border-color: transparent; }

/* モバイルでのみ表示されるサイドバー開閉ボタン */
.menu-btn { display: none; }

.app-body {
  flex: 1;
  display: flex;
  min-height: 0;
}

/* ---- sidebar ---- */

.sidebar {
  width: 240px;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 12px 0 12px 12px;
  min-height: 0;
}

.sidebar-header {
  display: flex;
  align-items: center;
  gap: 6px;
}

.new-conv-btn {
  flex: 1;
  justify-content: center;
  padding: 8px 12px;
}

/* 折りたたみ時はスリムなレール表示（トグルと新規会話のみ） */
.sidebar.collapsed { width: auto; }
.sidebar.collapsed .sidebar-header {
  flex-direction: column;
  align-items: stretch;
  gap: 8px;
}
.sidebar.collapsed .new-conv-btn { flex: none; padding: 8px; }
.sidebar.collapsed .new-conv-btn .btn-label { display: none; }
.sidebar.collapsed .conversation-list,
.sidebar.collapsed .sidebar-footer { display: none; }

.conversation-list {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.conv-empty {
  color: var(--text-sub);
  font-size: 12px;
  text-align: center;
  padding: 16px 8px;
}

.conv-item {
  display: flex;
  align-items: stretch;
  border-radius: 8px;
  overflow: hidden;
}
.conv-item:hover { background: var(--assistant-bubble); }
.conv-item.active { background: var(--chip-bg); }

.conv-open {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 2px;
  padding: 8px 4px 8px 10px;
  border: none;
  background: transparent;
  color: var(--text);
  font-family: inherit;
  font-size: 12.5px;
  text-align: left;
  cursor: pointer;
}
.conv-item.active .conv-open { color: var(--chip-text); }

.conv-title {
  width: 100%;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  font-weight: 500;
}

.conv-time { font-size: 10.5px; color: var(--text-sub); }

.conv-delete {
  border: none;
  background: transparent;
  color: var(--text-sub);
  padding: 0 8px;
  cursor: pointer;
  opacity: 0;
  display: flex;
  align-items: center;
}
.conv-item:hover .conv-delete { opacity: 1; }
.conv-delete:hover { color: var(--error); }

/* タッチ端末にはhoverがないため削除ボタンを常時表示する */
@media (hover: none) {
  .conv-delete { opacity: 1; }
}

.sidebar-footer {
  border-top: 1px solid var(--border);
  padding: 10px 4px 0;
}

.ext-download {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--text-sub);
  text-decoration: none;
}
.ext-download:hover { color: var(--accent); }

.app-main {
  flex: 1;
  display: grid;
  grid-template-columns: minmax(340px, 46%) 1fr;
  gap: 12px;
  padding: 12px;
  min-height: 0;
  min-width: 0;
}

.chat-pane, .scenario-pane {
  background: var(--pane-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  display: flex;
  flex-direction: column;
  min-height: 0;
  overflow: hidden;
}

/* ---- chat ---- */

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.chat-empty {
  margin: auto;
  text-align: center;
  color: var(--text-sub);
  font-size: 14px;
  max-width: 420px;
}

.chat-suggestions {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 14px;
}

.suggestion {
  padding: 10px 12px;
  border: 1px dashed var(--border);
  border-radius: 8px;
  background: transparent;
  color: var(--text);
  font-size: 13px;
  text-align: left;
  cursor: pointer;
}
.suggestion:hover { border-color: var(--accent); color: var(--accent); }

.msg {
  max-width: 88%;
  padding: 10px 14px;
  border-radius: 12px;
  font-size: 14px;
  line-height: 1.65;
  white-space: pre-wrap;
  word-break: break-word;
}

.msg-user {
  align-self: flex-end;
  background: var(--user-bubble);
  color: var(--user-bubble-text);
  border-bottom-right-radius: 4px;
}

.msg-assistant {
  align-self: flex-start;
  background: var(--assistant-bubble);
  border-bottom-left-radius: 4px;
}

.msg-system {
  align-self: center;
  color: var(--text-sub);
  font-size: 12px;
  background: transparent;
  padding: 2px 8px;
}

.msg-error {
  align-self: flex-start;
  background: var(--error-bg);
  color: var(--error);
  border: 1px solid var(--error);
}

.msg-loading { color: var(--text-sub); }
.msg-loading .dots::after {
  content: "…";
  animation: dots 1.2s steps(4, end) infinite;
}
@keyframes dots {
  0% { content: ""; }
  25% { content: "."; }
  50% { content: ".."; }
  75% { content: "..."; }
}

.chat-form {
  display: flex;
  flex-direction: column;
  padding: 12px 12px 8px;
  border-top: 1px solid var(--border);
}

/* 送信ボタンを内包する入力ボックス。枠とフォーカスリングはボックス側が持つ */
.chat-input-box {
  display: flex;
  align-items: flex-end;
  gap: 6px;
  padding: 6px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg);
}

.chat-input-box:focus-within {
  outline: 2px solid var(--accent);
  outline-offset: -1px;
}

.chat-send {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  padding: 0;
  border-radius: 8px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.chat-hint {
  align-self: flex-end;
  font-size: 11px;
  color: var(--text-sub);
  margin-top: 4px;
  user-select: none;
}

/* ソフトウェアキーボードではEnter送信を無効化しているためヒントも隠す */
@media (hover: none) and (pointer: coarse) {
  .chat-hint { display: none; }
}

/* 1行時に高さが送信ボタン(36px)と揃うよう line-height 22px + 上下padding 7px にしている。
   入力に応じてJS側で高さを自動調整し、max-height を超えたら内部スクロール */
.chat-form textarea {
  flex: 1;
  min-width: 0;
  resize: none;
  padding: 7px 4px 7px 8px;
  border: none;
  background: transparent;
  color: var(--text);
  font-family: inherit;
  font-size: 14px;
  line-height: 22px;
  max-height: 124px;
}
.chat-form textarea:focus { outline: none; }

/* ---- scenario pane ---- */

.pane-tabs {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 8px 12px 0;
  border-bottom: 1px solid var(--border);
}

.tab {
  padding: 7px 14px;
  border: none;
  background: transparent;
  color: var(--text-sub);
  font-size: 13px;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  white-space: nowrap;
}
.tab.active { color: var(--accent); border-bottom-color: var(--accent); font-weight: 600; }

.pane-tools { margin-left: auto; display: flex; gap: 6px; padding-bottom: 6px; }

.validation-banner {
  padding: 8px 14px;
  font-size: 12.5px;
  border-bottom: 1px solid var(--border);
  white-space: pre-wrap;
}
.validation-banner.ok { background: var(--ok-bg); color: var(--ok); }
.validation-banner.ng { background: var(--error-bg); color: var(--error); }

.tab-body {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  margin: 0;
}

.scenario-empty {
  margin: auto;
  text-align: center;
  color: var(--text-sub);
  font-size: 13.5px;
  line-height: 2;
  padding-top: 80px;
}

.scenario-empty-hint { font-size: 12px; }
.scenario-empty-hint a { color: var(--accent); }

.json-view {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 12.5px;
  line-height: 1.55;
  background: var(--code-bg);
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

/* preview */

.sc-header h2 { margin: 0 0 4px; font-size: 18px; }
.sc-meta { color: var(--text-sub); font-size: 12.5px; display: flex; gap: 12px; flex-wrap: wrap; overflow-wrap: anywhere; }
.sc-desc { margin: 8px 0 0; font-size: 13.5px; color: var(--text); }

.sc-category {
  margin-top: 18px;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}

.sc-category-header {
  padding: 10px 14px;
  background: var(--code-bg);
  border-bottom: 1px solid var(--border);
}
.sc-category-header h3 { margin: 0; font-size: 14.5px; }
.sc-category-header .cat-id { color: var(--text-sub); font-weight: 400; font-size: 12px; margin-left: 8px; }
.sc-category-header p { margin: 4px 0 0; font-size: 12.5px; color: var(--text-sub); }

.sc-step {
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
}
.sc-step:last-child { border-bottom: none; }

.sc-step-title {
  font-weight: 600;
  font-size: 13.5px;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
.step-id {
  font-family: Consolas, Menlo, monospace;
  font-size: 11px;
  color: var(--text-sub);
  background: var(--code-bg);
  padding: 1px 6px;
  border-radius: 4px;
}

.sc-step dl {
  margin: 8px 0 0;
  display: grid;
  grid-template-columns: 62px 1fr;
  gap: 4px 10px;
  font-size: 13px;
}
.sc-step dt { color: var(--text-sub); font-size: 12px; padding-top: 1px; }
.sc-step dd { margin: 0; white-space: pre-wrap; overflow-wrap: anywhere; }

.chips { display: flex; gap: 6px; flex-wrap: wrap; }
.chip {
  background: var(--chip-bg);
  color: var(--chip-text);
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 999px;
}

.kv {
  font-family: Consolas, Menlo, monospace;
  font-size: 12px;
  background: var(--code-bg);
  padding: 2px 6px;
  border-radius: 4px;
  margin-right: 6px;
  display: inline-block;
  margin-bottom: 3px;
}

/* ---- settings modal ---- */

.model-badge {
  font-size: 11.5px;
  color: var(--text-sub);
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 3px 10px;
  align-self: center;
  max-width: 260px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.45);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
}

.modal-overlay[hidden] { display: none; }

.modal {
  background: var(--pane-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 22px 24px;
  width: min(480px, calc(100vw - 32px));
  max-height: calc(100vh - 32px);
  max-height: calc(100dvh - 32px);
  overflow-y: auto;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.25);
}

.modal h2 { margin: 0 0 14px; font-size: 16px; }

.settings-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  margin: 14px 0 6px;
}

.modal input, .modal select {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
  color: var(--text);
  font-size: 13.5px;
  font-family: inherit;
}
.modal input:focus, .modal select:focus { outline: 2px solid var(--accent); outline-offset: -1px; }

.settings-hint {
  margin: 6px 0 0;
  font-size: 12px;
  color: var(--text-sub);
  line-height: 1.6;
}
.settings-hint a { color: var(--accent); }

.settings-security {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  margin-top: 10px;
  padding: 10px 12px;
  background: var(--ok-bg);
  border: 1px solid color-mix(in srgb, var(--ok) 35%, transparent);
  border-radius: 8px;
  font-size: 11.5px;
  line-height: 1.7;
  color: var(--text-sub);
}
.settings-security svg { flex-shrink: 0; margin-top: 2px; color: var(--ok); }
.settings-security strong { color: var(--text); font-size: 12px; }

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin-top: 20px;
}

/* ---- responsive ---- */

.sidebar-backdrop { display: none; }

@media (max-width: 860px) {
  .app-main { grid-template-columns: 1fr; grid-template-rows: minmax(0, 1fr) minmax(0, 1fr); }
  .app-subtitle { display: none; }
  .model-badge { display: none; }
  .menu-btn { display: inline-flex; }

  /* サイドバーはドロワー化。折りたたみ時は非表示にし、ヘッダーのメニューボタンから開く */
  .sidebar.collapsed { display: none; }
  .sidebar:not(.collapsed) {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    width: min(300px, 85vw);
    background: var(--pane-bg);
    border-right: 1px solid var(--border);
    padding: 12px;
    z-index: 60;
    box-shadow: 0 0 40px rgba(0, 0, 0, 0.3);
  }

  .sidebar-backdrop:not([hidden]) {
    display: block;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
    z-index: 55;
  }
}

@media (max-width: 640px) {
  .app-header { padding: 8px 10px; gap: 8px; }
  .app-title { gap: 8px; }
  .app-title h1 {
    font-size: 15px;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
  }
  .app-actions { gap: 6px; }
  /* ヘッダーのボタンはアイコンのみにして幅を確保する */
  .app-actions .btn-label { display: none; }
  .app-actions .btn { padding: 6px 9px; }

  .app-main { padding: 8px; gap: 8px; }
  .chat-messages { padding: 12px; }
  .msg { max-width: 92%; }
  .chat-form { padding: 8px 8px 6px; }
  .pane-tabs { padding: 6px 8px 0; gap: 2px; }
  .tab { padding: 7px 8px; }
  .pane-tools .btn-sm { padding: 3px 8px; }
  .tab-body { padding: 12px; }

  /* iOS Safariのフォーカス時自動ズームを防ぐため16px以上にする */
  .chat-form textarea,
  .modal input,
  .modal select { font-size: 16px; }

  .modal { padding: 18px 16px; }
}