:root {
  --bg: #0f0f0f;
  --bg-elev: #161616;
  --bg-card: #1a1a2e;
  --bg-hover: #232342;
  --bg-active: #2a1a3e;
  --border: #2a2a3a;
  --border-soft: #1f1f2a;
  --text: #e0e0e0;
  --text-dim: #a0a0a0;
  --text-mute: #666;
  --accent: #c084fc;
  --accent-strong: #7c5cbf;
  --accent-cyan: #06b6d4;
  --accent-green: #4ade80;
  --accent-amber: #f59e0b;
  --accent-red: #ef4444;
}

* { box-sizing: border-box; }
html, body, #app { height: 100%; margin: 0; width: 100%; overflow-x: hidden; }
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC',
    'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  -webkit-font-smoothing: antialiased;
}
.app { max-width: 100vw; overflow-x: hidden; }

button { font: inherit; cursor: pointer; }
textarea, input { font: inherit; }

::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-mute); }

/* ====== layout ====== */

.app {
  display: grid;
  grid-template-columns: var(--sidebar-w, 260px) 6px 1fr;
  height: 100vh;
}

.sidebar {
  border-right: 1px solid var(--border-soft);
  background: var(--bg-elev);
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.sidebar-header {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border-soft);
  display: flex;
  align-items: center;
  gap: 8px;
}
.sidebar-header h1 { margin: 0; font-size: 16px; font-weight: 600; }
.sidebar-header .new-btn {
  margin-left: auto;
  border: 1px solid var(--border);
  background: var(--bg-elev);
  color: var(--text-dim);
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 13px;
}
.sidebar-header .new-btn:hover { background: var(--bg-hover); color: var(--text); }

.doc-list { flex: 1; overflow-y: auto; padding: 6px; }
.doc-item {
  padding: 8px 10px;
  border-radius: 6px;
  cursor: pointer;
  margin-bottom: 2px;
  font-size: 13px;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-dim);
}
.doc-item:hover { background: var(--bg-card); color: var(--text); }
.doc-item.active { background: var(--bg-active); color: var(--accent); }
.doc-item .title {
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.doc-item .meta { font-size: 11px; color: var(--text-mute); }
.doc-item .del {
  border: none;
  background: transparent;
  color: var(--accent-red);
  font-size: 12px;
  visibility: hidden;
}
.doc-item:hover .del { visibility: visible; }

/* ====== workspace ====== */

.workspace {
  display: grid;
  grid-template-rows: 1fr 6px var(--input-h, 140px);
  min-width: 0;
  min-height: 0;
  background: var(--bg);
  overflow: hidden;
}

.editor-pane > * { min-width: 0; min-height: 0; }
.workspace > * { min-width: 0; }
.input-bar { min-width: 0; box-sizing: border-box; overflow: hidden; }

.editor-pane {
  display: grid;
  grid-template-columns: var(--editor-fr, 1fr) 6px var(--preview-fr, 1fr);
  grid-template-rows: auto 1fr;
  min-height: 0;
  border-bottom: 1px solid var(--border-soft);
}

/* 拖拽分隔条 */
.splitter {
  background: var(--border-soft);
  cursor: col-resize;
  transition: background 0.12s;
  user-select: none;
}
.splitter:hover { background: var(--accent-strong); }
.splitter-input { cursor: row-resize; }
@media (max-width: 768px) {
  .splitter { display: none; }
}

.title-row {
  grid-column: 1 / -1;
  padding: 10px 16px;
  border-bottom: 1px solid var(--border-soft);
  background: var(--bg-elev);
}
.title-row input {
  width: 100%;
  border: none;
  outline: none;
  font-size: 16px;
  font-weight: 600;
  background: transparent;
  color: var(--text);
}
.title-row input::placeholder { color: var(--text-mute); }

.editor, .preview {
  min-height: 0;
  overflow-y: auto;
  padding: 16px;
}
.editor {
  background: var(--bg-elev);
  overflow-x: hidden;
}
.editor textarea {
  width: 100%;
  max-width: 100%;
  height: 100%;
  border: none;
  outline: none;
  resize: none;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 13px;
  line-height: 1.6;
  background: transparent;
  color: var(--text);
  word-break: break-all;
}
.editor textarea::placeholder { color: var(--text-mute); }
.preview {
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
  word-wrap: break-word;
  overflow-wrap: anywhere;
}
.preview h1, .preview h2, .preview h3 { margin: 18px 0 8px; color: var(--accent); }
.preview p { margin: 8px 0; }
.preview a { color: var(--accent-cyan); }
.preview strong { color: var(--accent); }
.preview pre {
  background: var(--bg-elev); padding: 10px; border-radius: 6px;
  font-size: 12px; overflow-x: auto;
  max-width: 100%;
  border: 1px solid var(--border-soft);
}
.preview code { background: var(--bg-elev); padding: 1px 4px; border-radius: 3px; font-size: 12px; color: var(--accent-amber); }
.preview pre code { background: transparent; padding: 0; word-wrap: normal; overflow-wrap: normal; color: var(--text); }
.preview blockquote { border-left: 3px solid var(--accent-strong); margin: 8px 0; padding: 4px 12px; color: var(--text-dim); }
.preview img { max-width: 100%; height: auto; }
.preview table { display: block; max-width: 100%; overflow-x: auto; }
.preview hr { border: none; border-top: 1px solid var(--border); margin: 16px 0; }

/* ====== input bar ====== */

.input-bar {
  background: var(--bg-elev);
  border-top: 1px solid var(--border-soft);
  padding: 10px 12px;
  display: flex;
  flex-direction: column;
  min-height: 0;
}
.input-row {
  flex: 1;
  position: relative;
  min-height: 0;
}
.input-row textarea {
  width: 100%;
  height: 100%;
  /* 右 + 下 padding 给悬浮按钮腾空间，文字不会爬到按钮下 */
  padding: 11px 130px 14px 14px;
  resize: none;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  border-radius: 10px;
  outline: none;
  font-size: 14px;
  line-height: 1.5;
}
.input-row textarea::placeholder { color: var(--text-mute); }
.input-row textarea:focus { border-color: var(--accent-strong); }
.input-row textarea:disabled { opacity: 0.6; }

/* 悬浮在 textarea 框线内右下 */
.btn-tray {
  position: absolute;
  right: 8px;
  bottom: 8px;
  display: flex;
  gap: 6px;
  pointer-events: none;  /* 让 textarea 仍接受点击右下空白处定位光标 */
}
.btn-tray > * { pointer-events: auto; }

.btn {
  height: 32px;
  padding: 0 14px;
  border-radius: 7px;
  border: 1px solid var(--border);
  background: var(--bg-elev);
  color: var(--text-dim);
  font-size: 13px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.btn:hover { background: var(--bg-hover); color: var(--text); }
.btn.primary { background: var(--accent-strong); border-color: var(--accent-strong); color: #fff; font-weight: 600; }
.btn.primary:hover { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.primary:disabled { background: var(--bg-card); border-color: var(--border); color: var(--text-mute); cursor: not-allowed; }
.btn.mic { width: 36px; padding: 0; }
.btn.mic.on { background: var(--accent-red); border-color: var(--accent-red); color: #fff; }

.status {
  font-size: 12px;
  color: var(--text-mute);
  padding: 4px 4px 0;
  min-height: 18px;
}
.status.err { color: var(--accent-red); }

/* ====== mobile-only chrome ====== */

.mobile-bar {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  background: var(--bg-elev);
  border-bottom: 1px solid var(--border-soft);
  padding-top: max(8px, env(safe-area-inset-top));
}
.mobile-bar .hamburger,
.mobile-bar .pane-tabs button {
  border: 1px solid var(--border);
  background: var(--bg-elev);
  color: var(--text-dim);
  border-radius: 6px;
  font-size: 14px;
  padding: 6px 10px;
}
.mobile-bar .pane-tabs {
  margin-left: auto;
  display: flex;
  gap: 4px;
}
.mobile-bar .pane-tabs button.active {
  background: var(--accent-strong);
  color: #fff;
  border-color: var(--accent-strong);
}
.mobile-bar .doc-title {
  flex: 1 1 0;
  min-width: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  font-weight: 600;
  font-size: 14px;
}
.mobile-bar .doc-title input { min-width: 0; color: var(--text); }

.sidebar-backdrop {
  display: none;
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.55);
  z-index: 50;
}

/* ====== mobile layout ====== */

@media (max-width: 768px) {
  .app {
    grid-template-columns: 1fr;
    grid-template-rows: auto 1fr;
    height: 100dvh;
  }

  .mobile-bar { display: flex; }

  /* sidebar becomes a slide-in drawer */
  .sidebar {
    position: fixed;
    top: 0; left: 0; bottom: 0;
    width: 78vw;
    max-width: 320px;
    border-right: 1px solid var(--border-soft);
    border-bottom: none;
    transform: translateX(-100%);
    transition: transform 0.2s ease;
    z-index: 60;
    box-shadow: 2px 0 8px rgba(0,0,0,0.5);
  }
  .app.drawer-open .sidebar { transform: translateX(0); }
  .app.drawer-open .sidebar-backdrop { display: block; }

  .editor-pane {
    grid-template-columns: 1fr;
    grid-template-rows: 1fr;
    position: relative;
  }
  .title-row { display: none; }

  .editor, .preview {
    grid-column: 1;
    grid-row: 1;
    border-right: none;
    border-bottom: none;
    padding: 12px;
  }
  .editor { display: none; }
  .preview { display: none; }
  .app.pane-editor .editor { display: block; }
  .app.pane-preview .preview { display: block; }

  .input-bar {
    padding-bottom: max(10px, env(safe-area-inset-bottom));
  }
  .input-row textarea {
    font-size: 16px;
  }
  .btn { height: 44px; }
  .btn.mic { width: 48px; }
}

/* ====== modal ====== */

.modal-backdrop {
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.7);
  display: flex; align-items: center; justify-content: center;
  z-index: 100;
  backdrop-filter: blur(2px);
}
.modal {
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 24px;
  border-radius: 12px;
  width: 360px; max-width: 90vw;
  box-shadow: 0 12px 40px rgba(0,0,0,0.5);
}
.modal h2 { margin: 0 0 12px; font-size: 16px; color: var(--accent); }
.modal input {
  width: 100%; padding: 9px 12px;
  border: 1px solid var(--border);
  background: var(--bg-elev);
  color: var(--text);
  border-radius: 6px;
  margin-bottom: 12px; outline: none;
}
.modal input:focus { border-color: var(--accent-strong); }
.modal-actions { display: flex; gap: 8px; justify-content: flex-end; }