:root {
  --bg: #f5f6f8;
  --panel: #ffffff;
  --panel-2: #f0f2f5;
  --border: #e3e6ea;
  --text: #1f2329;
  --text-2: #6b7280;
  --accent: #2f6df6;
  --accent-soft: #e8f0ff;
  --danger: #e5484d;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.06), 0 8px 24px rgba(0, 0, 0, 0.04);
  --radius: 12px;
}

body.dark {
  --bg: #15171c;
  --panel: #1e2128;
  --panel-2: #262a33;
  --border: #2f343d;
  --text: #e8eaed;
  --text-2: #9aa1ad;
  --accent: #5b8cff;
  --accent-soft: #23304d;
  --danger: #ff6b6f;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.4), 0 8px 24px rgba(0, 0, 0, 0.3);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Microsoft YaHei", "Hiragino Sans GB", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
}

.app {
  display: grid;
  grid-template-columns: 300px 1fr;
  height: 100vh;
  overflow: hidden;
}

/* ===== 侧边栏 ===== */
.sidebar {
  display: flex;
  flex-direction: column;
  background: var(--panel);
  border-right: 1px solid var(--border);
  padding: 14px 12px;
  gap: 12px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 2px 4px;
}
.brand-logo { font-size: 22px; }
.brand-name {
  font-size: 17px;
  font-weight: 700;
  flex: 1;
  letter-spacing: 0.3px;
}

.icon-btn {
  border: none;
  background: var(--panel-2);
  color: var(--text);
  width: 32px;
  height: 32px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 15px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s, transform 0.1s;
}
.icon-btn:hover { background: var(--accent-soft); }
.icon-btn:active { transform: scale(0.94); }
.icon-btn.danger:hover { background: rgba(229, 72, 77, 0.15); }

.search-box {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0 10px;
}
.search-box:focus-within { border-color: var(--accent); }
.search-icon { font-size: 14px; opacity: 0.7; }
#searchInput {
  border: none;
  background: transparent;
  outline: none;
  color: var(--text);
  padding: 9px 0;
  width: 100%;
  font-size: 14px;
}

.new-btn {
  border: none;
  background: var(--accent);
  color: #fff;
  padding: 10px 12px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: filter 0.15s, transform 0.1s;
}
.new-btn:hover { filter: brightness(1.06); }
.new-btn:active { transform: scale(0.98); }

.note-list {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin: 0 -4px;
  padding: 0 4px;
}
.note-item {
  padding: 10px 12px;
  border-radius: 10px;
  cursor: pointer;
  border: 1px solid transparent;
  transition: background 0.12s, border-color 0.12s;
}
.note-item:hover { background: var(--panel-2); }
.note-item.active {
  background: var(--accent-soft);
  border-color: var(--accent);
}
.note-item .ni-title {
  font-size: 14px;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.note-item .ni-snippet {
  font-size: 12px;
  color: var(--text-2);
  margin-top: 3px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  white-space: pre-wrap;
  word-break: break-word;
}
.note-item .ni-date {
  font-size: 11px;
  color: var(--text-2);
  margin-top: 4px;
}

.sidebar-foot {
  font-size: 12px;
  color: var(--text-2);
  padding: 4px 6px;
  border-top: 1px solid var(--border);
}

/* ===== 编辑区 ===== */
.editor {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: var(--bg);
}

.empty-state {
  margin: auto;
  text-align: center;
  color: var(--text-2);
  max-width: 360px;
}
.empty-emoji { font-size: 54px; }
.empty-state h2 { color: var(--text); margin: 12px 0 6px; font-size: 20px; }
.empty-state p { font-size: 14px; line-height: 1.6; }

.editor-pane {
  display: flex;
  flex-direction: column;
  height: 100%;
}
.editor-top {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 22px;
  border-bottom: 1px solid var(--border);
  background: var(--panel);
}
.title-input {
  flex: 1;
  border: none;
  background: transparent;
  outline: none;
  font-size: 22px;
  font-weight: 700;
  color: var(--text);
  padding: 4px 0;
}
.editor-actions { display: flex; align-items: center; gap: 8px; }
.save-status {
  font-size: 12px;
  color: var(--text-2);
  min-width: 42px;
  text-align: right;
}
.save-status.saving { color: var(--accent); }

.editor-body {
  flex: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  overflow: hidden;
}
.editor-body.preview-off {
  grid-template-columns: 1fr;
}
.editor-body.preview-off .preview-pane {
  display: none;
}
.content-input {
  border: none;
  outline: none;
  resize: none;
  padding: 22px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text);
  background: var(--panel);
  font-family: "SFMono-Regular", "JetBrains Mono", Consolas, "PingFang SC",
    "Microsoft YaHei", monospace;
}
.preview-pane {
  border-left: 1px solid var(--border);
  padding: 22px 26px;
  overflow-y: auto;
  background: var(--panel);
  line-height: 1.75;
}

.editor-foot {
  padding: 8px 22px;
  border-top: 1px solid var(--border);
  background: var(--panel);
  font-size: 12px;
  color: var(--text-2);
}

.hidden { display: none !important; }

/* ===== Markdown 渲染样式 ===== */
.markdown-body h1, .markdown-body h2, .markdown-body h3,
.markdown-body h4, .markdown-body h5, .markdown-body h6 {
  margin: 1.1em 0 0.5em;
  line-height: 1.3;
}
.markdown-body h1 { font-size: 1.7em; }
.markdown-body h2 { font-size: 1.4em; }
.markdown-body h3 { font-size: 1.2em; }
.markdown-body p { margin: 0.6em 0; }
.markdown-body a { color: var(--accent); }
.markdown-body code {
  background: var(--panel-2);
  padding: 2px 6px;
  border-radius: 5px;
  font-size: 0.9em;
  font-family: Consolas, monospace;
}
.markdown-body pre {
  background: var(--panel-2);
  padding: 14px 16px;
  border-radius: 10px;
  overflow-x: auto;
}
.markdown-body pre code { background: transparent; padding: 0; }
.markdown-body blockquote {
  margin: 0.8em 0;
  padding: 4px 14px;
  border-left: 4px solid var(--accent);
  color: var(--text-2);
  background: var(--accent-soft);
  border-radius: 0 8px 8px 0;
}
.markdown-body ul, .markdown-body ol { padding-left: 1.5em; }
.markdown-body li { margin: 0.3em 0; }
.markdown-body hr { border: none; border-top: 1px solid var(--border); margin: 1.2em 0; }
.markdown-body img { max-width: 100%; border-radius: 8px; }
.markdown-body table { border-collapse: collapse; width: 100%; }
.markdown-body th, .markdown-body td {
  border: 1px solid var(--border);
  padding: 6px 10px;
}

/* ===== 滚动条 ===== */
.note-list::-webkit-scrollbar, .preview-pane::-webkit-scrollbar,
.content-input::-webkit-scrollbar { width: 8px; }
.note-list::-webkit-scrollbar-thumb, .preview-pane::-webkit-scrollbar-thumb,
.content-input::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 8px;
}

/* ===== 响应式 ===== */
@media (max-width: 720px) {
  .app { grid-template-columns: 0 1fr; }
  .sidebar {
    position: fixed;
    z-index: 20;
    width: 280px;
    height: 100vh;
    transform: translateX(-100%);
    transition: transform 0.2s;
  }
  .app.show-sidebar .sidebar { transform: translateX(0); }
  .editor-body { grid-template-columns: 1fr; }
  .preview-pane { border-left: none; border-top: 1px solid var(--border); }
}