/* ===== Reset & Base ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html, body { height: 100%; overflow: hidden; }
body {
  --accent: #4f46e5;
  --accent-hover: #4338ca;
  --accent-light: #eef2ff;
  --accent-border: #c7d2fe;
  --accent-subtle: #f8fafc;
  --accent-text: #4f46e5;
  --bg: #f0f2f5;
  --surface: #fff;
  --surface-alt: #f8fafc;
  --text: #334155;
  --text-secondary: #64748b;
  --text-heading: #0f172a;
  --border: #e2e8f0;
  --border-light: #e9eef3;
  --shadow: 0 1px 3px rgba(0,0,0,0.06);
  --radius: 4px;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  background: var(--bg);
  color: var(--text);
  transition: background 0.3s, color 0.3s;
}

/* ===== Theme Colors ===== */
body.theme-sky { --accent: #0ea5e9; --accent-hover: #0284c7; --accent-light: #f0f9ff; --accent-border: #bae6fd; --accent-subtle: #f0f9ff; --accent-text: #0ea5e9; }
body.theme-emerald { --accent: #10b981; --accent-hover: #059669; --accent-light: #ecfdf5; --accent-border: #a7f3d0; --accent-subtle: #f0fdf4; --accent-text: #059669; }
body.theme-rose { --accent: #f43f5e; --accent-hover: #e11d48; --accent-light: #fff1f2; --accent-border: #fecdd3; --accent-subtle: #fff5f6; --accent-text: #e11d48; }
body.theme-orange { --accent: #f97316; --accent-hover: #ea580c; --accent-light: #fff7ed; --accent-border: #fed7aa; --accent-subtle: #fff7ed; --accent-text: #ea580c; }
body.theme-purple { --accent: #8b5cf6; --accent-hover: #7c3aed; --accent-light: #f5f3ff; --accent-border: #ddd6fe; --accent-subtle: #faf5ff; --accent-text: #7c3aed; }

/* ===== App Layout ===== */
.app { display: flex; flex-direction: column; height: 100vh; }

/* ===== Header ===== */
.app-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border-light);
  padding: 0 12px;
  height: 46px;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
  box-shadow: 0 1px 4px rgba(0,0,0,0.05);
  z-index: 10;
}
.app-header .logo { font-size: 15px; font-weight: 700; color: var(--text-heading); display: flex; align-items: center; gap: 5px; margin-right: 2px; }
.app-header .logo span { color: var(--accent); font-size: 17px; }
.hdr-btn {
  background: transparent;
  border: none;
  border-radius: 6px;
  padding: 4px 8px;
  font-size: 14px;
  cursor: pointer;
  color: var(--text-secondary);
  transition: all 0.15s;
  white-space: nowrap;
  height: 30px;
  line-height: 1;
}
.hdr-btn:hover { background: var(--accent-light); color: var(--accent-text); }
.hdr-btn.active { background: var(--accent-light); color: var(--accent-text); font-weight: 500; }
.hdr-div { width: 1px; height: 18px; background: var(--border); flex-shrink: 0; margin: 0 2px; }
.hdr-group { display: flex; align-items: center; gap: 6px; }
.hdr-group .hdr-btn { padding: 3px 8px; font-size: 14px; }
.hdr-spacer { flex: 1; }
#hdrThemes { gap: 8px; }

/* ===== Main Layout ===== */
.main-layout { display: flex; flex: 1; min-height: 0; }

/* ===== File Sidebar ===== */
.file-sidebar {
  width: 200px;
  background: var(--surface);
  border-right: 1px solid var(--border-light);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  transition: width 0.2s, opacity 0.2s;
  overflow: hidden;
}
.file-sidebar.collapsed { width: 0; border-right: none; opacity: 0; }
.fs-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 10px;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.3px;
  border-bottom: 1px solid var(--border-light);
  flex-shrink: 0;
}
.fs-header button {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 50%;
  width: 20px;
  height: 20px;
  font-size: 14px;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s;
}
.fs-header button:hover { background: var(--accent-hover); }
.fs-list { flex: 1; overflow-y: auto; padding: 4px 0; }
.fs-item {
  display: flex;
  align-items: center;
  padding: 6px 10px;
  font-size: 13px;
  cursor: pointer;
  border-radius: 0;
  transition: background 0.1s;
  gap: 6px;
  color: var(--text);
}
.fs-item:hover { background: var(--accent-light); }
.fs-item.active { background: var(--accent-light); color: var(--accent-text); font-weight: 500; }
.fs-item .fs-name { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.fs-item .fs-del {
  opacity: 0;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-secondary);
  font-size: 14px;
  padding: 0 2px;
  line-height: 1;
  transition: opacity 0.1s, color 0.1s;
}
.fs-item:hover .fs-del { opacity: 0.5; }
.fs-item .fs-del:hover { opacity: 1; color: #ef4444; }

/* ===== Split Pane ===== */
.split-pane { display: flex; flex: 1; min-width: 0; }
.pane {
  display: flex;
  flex-direction: column;
  min-width: 0;
}
.pane-editor { flex: 6; }
.pane-preview { flex: 4; }
.editor-toolbar {
  min-height: 36px;
  padding: 2px 8px;
  display: flex;
  align-items: center;
  gap: 2px;
  background: var(--surface);
  border-bottom: 1px solid var(--border-light);
  flex-shrink: 0;
  flex-wrap: wrap;
}
.tb-btn {
  background: transparent;
  border: none;
  border-radius: 5px;
  padding: 3px 6px;
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  color: var(--text-secondary);
  transition: all 0.12s;
  height: 28px;
  line-height: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 2px;
  flex-shrink: 0;
  font-family: inherit;
}
.tb-btn:hover { background: var(--accent-light); color: var(--accent-text); }
.tb-btn.active { background: var(--accent-light); color: var(--accent-text); }
.tb-btn.tb-copy { background: var(--accent); color: #fff; border-radius: 5px; padding: 3px 10px; }
.tb-btn.tb-copy:hover { background: var(--accent-hover); }
.tb-sep { width: 1px; height: 16px; background: var(--border); flex-shrink: 0; margin: 0 3px; }
.tb-spacer { flex: 1; min-width: 4px; }
.tb-select {
  font-size: 12px;
  padding: 2px 4px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  height: 22px;
  outline: none;
  font-family: inherit;
  flex-shrink: 0;
}
.tb-select:focus { border-color: var(--accent); }
.pv-header {
  height: 36px;
  padding: 0 14px;
  display: flex;
  align-items: center;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--surface);
  border-bottom: 1px solid var(--border-light);
  flex-shrink: 0;
}
.pv-header .pv-close-btn {
  margin-left: auto;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-secondary);
  font-size: 14px;
  padding: 2px 6px;
  border-radius: 4px;
  line-height: 1;
  display: none;
}
.pv-header .pv-close-btn:hover { background: var(--accent-light); color: var(--accent-text); }
.pv-article-title {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-heading);
  margin: 0 0 32px;
  line-height: 1.4;
}

/* ===== Split Divider ===== */
.split-divider {
  width: 4px;
  cursor: col-resize;
  background: var(--border-light);
  flex-shrink: 0;
  position: relative;
  transition: background 0.15s;
}
.split-divider:hover { background: var(--accent-border); }
.split-divider::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 2px;
  height: 24px;
  background: var(--border);
  border-radius: 1px;
}

/* ===== Markdown Source Editor ===== */
.md-source {
  flex: 1;
  border: none;
  outline: none;
  resize: none;
  padding: 20px 24px;
  font-family: 'SF Mono', 'Fira Code', 'Consolas', 'Monaco', monospace;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text);
  background: var(--surface);
  tab-size: 2;
  overflow-y: auto;
}
.md-source::placeholder { color: #94a3b8; }

/* ===== Preview ===== */
.preview-scroll {
  flex: 1;
  overflow-y: auto;
  padding: 0;
  background: var(--surface);
}
.preview-content {
  max-width: 760px;
  margin: 0 auto;
  padding: 32px 40px;
  min-height: 100%;
}

/* ===== Preview Typography ===== */
.preview-content { line-height: 1.75; font-size: 16px; color: var(--text); word-wrap: break-word; }
.preview-content h1 { font-size: 28px; font-weight: 600; margin: 0 0 24px; color: var(--text-heading); }
.preview-content h2 { font-size: 22px; font-weight: 600; margin: 0 0 24px; color: var(--text-heading); }
.preview-content h3 { font-size: 20px; font-weight: 600; margin: 0 0 20px; color: var(--text-heading); }
.preview-content p { margin: 0 0 26px; }
.preview-content ul, .preview-content ol { margin: 0 0 24px; padding-left: 1.8em; }
.preview-content li { margin: 0.3em 0; }
.preview-content blockquote { margin: 0 0 24px; padding: 16px 24px; background: var(--accent-subtle); border-left: 4px solid var(--accent); border-radius: 0 10px 10px 0; color: #475569; }
.preview-content pre { margin: 0 0 24px; padding: 18px 22px; background: #0f172a; color: #e2e8f0; border-radius: 10px; font-size: 14px; line-height: 1.6; overflow-x: auto; font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace; }
.preview-content pre code { background: none; padding: 0; color: inherit; font-size: inherit; border-radius: 0; }
.preview-content code { background: var(--accent-light); padding: 2px 6px; border-radius: 4px; font-size: 0.9em; color: var(--accent-text); font-family: 'SF Mono', 'Consolas', monospace; }
.preview-content a { color: var(--accent); text-decoration: underline; text-underline-offset: 2px; }
.preview-content img { max-width: 100%; height: auto; border-radius: 8px; margin: 0 0 24px 0; display: block; }
.preview-content table { width: 100%; border-collapse: collapse; margin: 0 0 24px 0; font-size: 14px; }
.preview-content table th, .preview-content table td { border: 1px solid var(--border); padding: 12px 14px; text-align: left; }
.preview-content table th { background: var(--accent-subtle); font-weight: 600; color: var(--text-heading); }
.preview-content hr { border: none; border-top: 2px dashed var(--border); margin: 2em 0; }
.preview-content ul.task-list { list-style: none; padding-left: 0; }
.preview-content li.task-list-item { display: flex; align-items: flex-start; gap: 8px; }
.preview-content li.task-list-item input[type="checkbox"] { margin-top: 0.3em; }

/* ===== Font Styles ===== */
body.font-serif .preview-content { font-family: 'Georgia', 'Noto Serif SC', 'Source Han Serif SC', serif !important; }
body.font-sans .preview-content { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif !important; }
body.font-mono .preview-content { font-family: 'SF Mono', 'Fira Code', 'Consolas', 'Noto Sans Mono', monospace !important; }

/* ===== Template Styles ===== */
body.template-modern .preview-content h1 { border-left: 5px solid var(--accent); padding-left: 20px; }
body.template-modern .preview-content h2 { padding-bottom: 8px; border-bottom: 2px solid var(--accent-light); }
body.template-modern .preview-content h3 { display: inline-block; padding-left: 14px; position: relative; }
body.template-modern .preview-content h3::before { content: ''; position: absolute; left: 0; top: 0.15em; bottom: 0.15em; width: 4px; background: var(--accent); border-radius: 2px; }
body.template-modern .preview-content blockquote { border-left-color: var(--accent); background: var(--accent-subtle); border-left-width: 5px; font-style: normal; }
body.template-modern .preview-content pre { border: 1px solid var(--accent-border); border-left: 3px solid var(--accent); }
body.template-modern .preview-content table th { background: var(--accent-light); color: var(--accent-text); }
body.template-modern .preview-content table { border: 1px solid var(--accent-border); }
body.template-modern .preview-content code { background: var(--accent-light); color: var(--accent-text); border: none; }
body.template-modern .preview-content pre code { background: none; color: inherit; border: none; }
body.template-modern .preview-content a { color: var(--accent); font-weight: 500; }
body.template-modern .preview-content hr { border-top-color: var(--accent-border); border-top-style: solid; }

body.template-paper .preview-content { font-feature-settings: 'kern' 1; }
body.template-paper .preview-content h1 { text-align: center; color: var(--accent); border-bottom: 2px solid var(--accent-border); display: inline-block; width: auto; padding-bottom: 8px; margin-left: auto; margin-right: auto; letter-spacing: 0.08em; }
body.template-paper .preview-content h2 { text-align: center; font-size: 20px; color: var(--accent-text); margin-bottom: 24px; letter-spacing: 0.05em; }
body.template-paper .preview-content h2::after { content: ''; display: block; width: 40px; height: 2px; background: var(--accent); margin: 10px auto 0; border-radius: 1px; }
body.template-paper .preview-content h3 { font-size: 18px; color: var(--text-heading); font-weight: 500; }
body.template-paper .preview-content p { text-align: justify; }
body.template-paper .preview-content blockquote { background: var(--accent-subtle); border-left: 3px solid var(--accent); font-style: italic; padding: 18px 24px; border-radius: 2px; }
body.template-paper .preview-content blockquote p { font-size: 15px; color: #555; }
body.template-paper .preview-content pre { background: #fafafa; border: 1px solid #e5e7eb; border-radius: 6px; }
body.template-paper .preview-content pre code { background: none; color: inherit; border: none; }
body.template-paper .preview-content code { background: #f5f5f5; color: #d97706; padding: 1px 6px; border: 1px solid #f0f0f0; }
body.template-paper .preview-content table { border-collapse: collapse; }
body.template-paper .preview-content table th { background: #fafafa; color: var(--text-heading); border-bottom: 2px solid #d1d5db; }
body.template-paper .preview-content table td { border-color: #e5e7eb; }
body.template-paper .preview-content img { border-radius: 4px; border: 1px solid #e5e7eb; padding: 4px; }
body.template-paper .preview-content hr { border-top: 1px solid #d1d5db; border-top-style: solid; }
body.template-paper .preview-content a { color: var(--accent); text-decoration: none; border-bottom: 1px solid var(--accent-border); }

body.template-codex .preview-content { font-family: 'SF Mono', 'Fira Code', 'Consolas', 'PingFang SC', sans-serif; letter-spacing: 0.3px; }
body.template-codex .preview-content h1 { background: linear-gradient(135deg, var(--accent), var(--accent-hover)); color: #fff; display: inline-block; padding: 6px 24px; border-radius: 40px; font-size: 22px; font-weight: 700; letter-spacing: 0.04em; box-shadow: 0 4px 15px rgba(0,0,0,0.15); }
body.template-codex .preview-content h2 { display: inline-block; font-size: 18px; font-weight: 700; color: #fff; background: linear-gradient(90deg, var(--accent), var(--accent-hover)); padding: 8px 18px; border-radius: 20px 20px 20px 4px; letter-spacing: 0.02em; box-shadow: 0 6px 14px rgba(0,0,0,0.12); }
body.template-codex .preview-content h3 { font-size: 17px; font-weight: 700; color: var(--text-heading); padding-bottom: 8px; background: linear-gradient(90deg, var(--accent) 0%, transparent 100%); background-size: 60% 3px; background-repeat: no-repeat; background-position: 0 100%; }
body.template-codex .preview-content h4 { font-size: 16px; font-weight: 700; color: var(--accent); background: var(--accent-light); display: inline-block; padding: 4px 12px; border-radius: 12px; }
body.template-codex .preview-content strong { color: var(--accent); font-weight: 700; }
body.template-codex .preview-content blockquote { margin: 36px 0; padding: 24px; background: rgba(255,255,255,0.6); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); border: 1px solid var(--accent-border); box-shadow: -4px -4px 10px rgba(255,255,255,0.4), 4px 4px 20px rgba(0,0,0,0.04); border-radius: 16px; border-top: 4px solid var(--accent); border-left: none; }
body.template-codex .preview-content blockquote p { color: #555; margin: 0; font-size: 15px; }
body.template-codex .preview-content pre { background: #282c34; color: #abb2bf; border: 1px solid #2d2d4a; border-radius: 12px; box-shadow: 0 10px 30px rgba(0,0,0,0.1); }
body.template-codex .preview-content pre code.hljs { background: #282c34; color: #abb2bf; }
body.template-codex .preview-content code { color: var(--accent); background: var(--accent-light); border: 1px solid var(--accent-border); padding: 2px 6px; border-radius: 6px; font-size: 14px; }
body.template-codex .preview-content pre code { background: none; color: inherit; border: none; padding: 0; font-size: inherit; border-radius: 0; }
body.template-codex .preview-content table { border: 1px solid var(--border); border-radius: 12px; overflow: hidden; box-shadow: 0 4px 15px rgba(0,0,0,0.03); }
body.template-codex .preview-content table th { background: var(--accent-light); color: var(--accent-text); border-bottom: 2px solid var(--accent); }
body.template-codex .preview-content table td { border-color: var(--border); }
body.template-codex .preview-content a { color: var(--accent); text-decoration: none; border-bottom: 1px dashed var(--accent-border); font-weight: 600; }
body.template-codex .preview-content hr { border: 0; height: 2px; background: linear-gradient(90deg, transparent 0%, var(--accent) 50%, transparent 100%); width: 80%; margin: 40px auto; }
body.template-codex .preview-content img { border-radius: 12px; border: 1px solid var(--border); box-shadow: 0 15px 35px rgba(0,0,0,0.06); }
body.template-codex .preview-content ul { color: var(--accent); }
body.template-codex .preview-content ul li { color: var(--text); }
body.template-codex .preview-content ol { color: var(--accent-text); font-weight: 600; }
body.template-codex .preview-content ol li { color: var(--text); font-weight: 400; }
body.template-codex .preview-content mark { background: var(--accent-light); color: var(--accent-text); padding: 2px 6px; border-radius: 4px; }

/* ===== Task List ===== */
.preview-content .task-list-item { list-style: none; margin-left: -1.4em; }
.preview-content .task-list-item input[type="checkbox"] { margin-right: 6px; accent-color: var(--accent); transform: scale(1.05); vertical-align: middle; }
body.dark-mode .preview-content .task-list-item input[type="checkbox"] { accent-color: var(--accent); }

/* ===== Buttons ===== */
.tb-btn:disabled { opacity: 0.4; cursor: not-allowed; }
.btn-copy, .btn-clear {
  border-radius: 40px;
  padding: 7px 16px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all 0.15s;
  text-align: center;
}
.btn-copy { background: var(--accent); color: #fff; }
.btn-copy:hover { background: var(--accent-hover); }
.btn-clear { background: var(--surface-alt); border: 1px solid var(--border); color: var(--text-secondary); }
.btn-clear:hover { background: var(--border); }

/* ===== Color Picker ===== */
.color-input-wrap {
  position: relative;
  width: 22px; height: 22px;
  overflow: hidden;
  border: 1px solid var(--border);
  cursor: pointer;
  flex-shrink: 0;
  display: inline-block;
  border-radius: 4px;
}
.color-input-wrap input[type="color"] {
  position: absolute;
  top: -4px; left: -4px;
  width: 30px; height: 30px;
  cursor: pointer;
  border: none;
  padding: 0;
}

/* ===== Theme Palette ===== */
.theme-palette { display: flex; gap: 6px; align-items: center; }
.theme-dot {
  width: 20px; height: 20px;
  border-radius: 50%;
  border: 2px solid transparent;
  cursor: pointer;
  transition: all 0.15s;
  padding: 0;
  flex-shrink: 0;
}
.theme-dot:hover { transform: scale(1.15); }
.theme-dot.active { border-color: var(--text-heading); box-shadow: 0 0 0 2px var(--surface), 0 0 0 4px var(--dot-clr); }
.theme-dot[data-theme="indigo"] { --dot-clr: #4f46e5; background: #4f46e5; }
.theme-dot[data-theme="sky"] { --dot-clr: #0ea5e9; background: #0ea5e9; }
.theme-dot[data-theme="emerald"] { --dot-clr: #10b981; background: #10b981; }
.theme-dot[data-theme="rose"] { --dot-clr: #f43f5e; background: #f43f5e; }
.theme-dot[data-theme="orange"] { --dot-clr: #f97316; background: #f97316; }
.theme-dot[data-theme="purple"] { --dot-clr: #8b5cf6; background: #8b5cf6; }

/* ===== Sidebar Controls ===== */
.sidebar { width: 270px; flex-shrink: 0; background: var(--surface); border-left: 1px solid var(--border-light); display: flex; flex-direction: column; overflow-y: auto; }
.sb-section { padding: 12px 14px; }
.sb-section + .sb-section { border-top: 1px solid var(--border-light); }
.sb-label { font-size: 11px; font-weight: 600; color: #94a3b8; text-transform: uppercase; letter-spacing: 0.3px; margin-bottom: 6px; }
.sb-row { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }
.sb-slider {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 12px;
  background: var(--surface-alt);
  padding: 2px 8px;
  border-radius: 20px;
  border: 1px solid var(--border);
  margin-top: 4px;
}
.sb-slider span:first-child { color: var(--text-secondary); min-width: 2em; flex-shrink: 0; }
.sb-slider span:last-child { min-width: 1.6em; text-align: center; font-weight: 600; flex-shrink: 0; }
.sb-slider input[type="range"] { flex: 1; cursor: pointer; height: 4px; min-width: 40px; accent-color: var(--accent); }

/* ===== AI ===== */
.ai-config { display: none; margin-top: 4px; }
.ai-config.show { display: block; }
.ai-input {
  width: 100%;
  padding: 4px 8px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 12px;
  color: var(--text);
  background: var(--surface);
  outline: none;
  transition: border-color 0.15s;
  font-family: inherit;
}
.ai-input:focus { border-color: var(--accent); box-shadow: 0 0 0 2px var(--accent-light); }
.ai-grid { display: flex; flex-wrap: wrap; gap: 4px; margin-top: 4px; }
.tb-btn.ai-btn { font-size: 11px; padding: 2px 7px; height: 22px; line-height: 1; }

/* ===== Float Toolbar ===== */
.float-toolbar {
  position: fixed;
  background: #0f172a;
  border-radius: 40px;
  padding: 4px 8px;
  display: flex;
  gap: 4px;
  z-index: 1000;
  box-shadow: 0 6px 20px rgba(0,0,0,0.25);
  animation: fadeIn 0.12s ease;
  pointer-events: auto;
}
.float-toolbar button {
  background: transparent;
  border: none;
  color: #fff;
  padding: 4px 8px;
  cursor: pointer;
  border-radius: 20px;
  font-size: 12px;
  transition: background 0.1s;
}
.float-toolbar button:hover { background: var(--accent, #4f46e5); }

/* ===== Emoji Picker ===== */
.emoji-picker {
  position: fixed;
  background: var(--surface);
  box-shadow: 0 12px 40px rgba(0,0,0,0.18);
  width: 300px;
  max-height: 340px;
  overflow-y: auto;
  z-index: 200;
  padding: 8px;
  display: none;
  border-radius: 12px;
}
.emoji-grid { display: grid; grid-template-columns: repeat(8, 1fr); gap: 2px; }
.emoji-item { font-size: 20px; text-align: center; cursor: pointer; padding: 3px; border-radius: 6px; transition: background 0.1s; }
.emoji-item:hover { background: var(--accent-light); }

/* ===== Modals ===== */
.shortcuts-modal {
  position: fixed;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  background: var(--surface);
  border-radius: 20px;
  padding: 24px;
  max-width: 460px;
  width: 90%;
  z-index: 1000;
  box-shadow: 0 25px 60px rgba(0,0,0,0.25);
  display: none;
}
.shortcuts-modal.show { display: block; }
.shortcuts-modal h3 { font-size: 16px; margin-bottom: 12px; color: var(--text-heading); }
.shortcuts-grid { display: grid; grid-template-columns: 1fr 2fr; gap: 6px 14px; font-size: 13px; }
.shortcuts-grid span:first-child { text-align: right; color: var(--accent-text); font-weight: 600; }
.shortcuts-grid span:last-child { color: var(--text); }
.overlay {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.45);
  z-index: 999;
  display: none;
}
.overlay.show { display: block; }
.toast {
  position: fixed;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  background: #0f172a;
  color: #fff;
  padding: 7px 20px;
  border-radius: 50px;
  font-size: 13px;
  z-index: 2000;
  transition: opacity 0.25s, visibility 0.25s;
  box-shadow: 0 4px 16px rgba(0,0,0,0.2);
  pointer-events: none;
}

/* ===== Footer ===== */
.editor-footer {
  height: 30px;
  padding: 0 10px;
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--text-secondary);
  background: var(--surface);
  border-top: 1px solid var(--border-light);
  flex-shrink: 0;
}
.editor-footer .tb-btn { height: 24px; padding: 2px 8px; font-size: 12px; color: var(--text-secondary); }
.editor-footer .tb-btn:hover { color: var(--accent-text); }
.editor-footer .hd-copy { background: var(--accent); color: #fff !important; border-radius: 4px; }
.editor-footer .hd-copy:hover { background: var(--accent-hover) !important; }
.ef-sep { width: 1px; height: 14px; background: var(--border); margin: 0 4px; flex-shrink: 0; }
.ef-stat { display: inline-flex; align-items: center; gap: 2px; white-space: nowrap; }
.ef-stat b { font-weight: 600; color: var(--text); }
.ef-spacer { flex: 1; }
.ef-file { font-size: 12px; color: var(--text-secondary); max-width: 160px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.fs-footer {
  padding: 6px 10px;
  font-size: 12px;
  color: var(--text-secondary);
  border-top: 1px solid var(--border-light);
  flex-shrink: 0;
  text-align: center;
}

.app-footer { display: none; }

/* ===== Tooltip ===== */
[data-tip] { position: relative; }
[data-tip]:hover::after {
  content: attr(data-tip);
  position: absolute;
  bottom: calc(100% + 6px);
  left: 50%;
  transform: translateX(-50%);
  background: #0f172a;
  color: #fff;
  padding: 3px 8px;
  border-radius: 6px;
  font-size: 12px;
  white-space: nowrap;
  z-index: 100;
  pointer-events: none;
}

/* ===== Dark Mode ===== */
body.dark-mode {
  --bg: #12121e;
  --surface: #1e1e32;
  --surface-alt: #1e1e32;
  --text: #cbd5e1;
  --text-secondary: #94a3b8;
  --text-heading: #f1f5f9;
  --border: #3d3d5c;
  --border-light: #2d2d4a;
  --shadow: 0 1px 3px rgba(0,0,0,0.2);
  --accent-light: #2d2d4a;
}
body.dark-mode .app-header { background: var(--surface); }
body.dark-mode .file-sidebar { background: var(--surface); border-color: var(--border-light); }
body.dark-mode .md-source { background: var(--surface); color: var(--text); }
body.dark-mode .preview-scroll { background: var(--surface); }
body.dark-mode .preview-content { color: var(--text); }
body.dark-mode .preview-content h1, body.dark-mode .preview-content h2, body.dark-mode .preview-content h3 { color: var(--text-heading); }
body.dark-mode .preview-content table th { background: #2d2d4a; color: var(--text-heading); }
body.dark-mode .preview-content table th, body.dark-mode .preview-content table td { border-color: #3d3d5c; }
body.dark-mode .preview-content hr { border-top-color: #3d3d5c; }

body.dark-mode.template-modern .preview-content h2 { border-bottom-color: #2d2d4a; }
body.dark-mode.template-modern .preview-content pre { background: #0f0f1e; border-color: #2d2d4a; }
body.dark-mode.template-modern .preview-content code { background: #2d2d4a; }
body.dark-mode.template-modern .preview-content pre code { background: none; color: inherit; }
body.dark-mode.template-modern .preview-content blockquote { background: #1a1a2e; color: #c8d0dc; }

body.dark-mode.template-paper .preview-content h2::after { background: var(--accent); }
body.dark-mode.template-paper .preview-content blockquote { background: #1a1a2e; }
body.dark-mode.template-paper .preview-content blockquote p { color: #c8d0dc; }
body.dark-mode.template-paper .preview-content pre { background: #0f0f1e; border-color: #2d2d4a; }
body.dark-mode.template-paper .preview-content pre code { background: none; color: inherit; }
body.dark-mode.template-paper .preview-content code { background: #2d2d4a; color: #a5b4fc; border-color: #3d3d5c; }
body.dark-mode.template-paper .preview-content table th { background: #1a1a2e; }
body.dark-mode.template-paper .preview-content table td { border-color: #2d2d4a; }
body.dark-mode.template-paper .preview-content img { border-color: #2d2d4a; }
body.dark-mode.template-paper .preview-content hr { border-top-color: #2d2d4a; }

body.dark-mode.template-codex .preview-content h1 { box-shadow: 0 4px 20px rgba(0,0,0,0.25); }
body.dark-mode.template-codex .preview-content h2 { box-shadow: 0 6px 18px rgba(0,0,0,0.2); }
body.dark-mode.template-codex .preview-content h3 { background: linear-gradient(90deg, var(--accent) 0%, transparent 100%); background-size: 60% 3px; background-repeat: no-repeat; background-position: 0 100%; }
body.dark-mode.template-codex .preview-content blockquote { background: rgba(30,30,50,0.75); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); border-color: #2d2d4a; border-top-color: var(--accent); box-shadow: -4px -4px 10px rgba(0,0,0,0.15), 4px 4px 20px rgba(0,0,0,0.1); }
body.dark-mode.template-codex .preview-content blockquote p { color: #94a3b8; }
body.dark-mode.template-codex .preview-content pre { border-color: #2d2d4a; background: #1a1d23; }
body.dark-mode.template-codex .preview-content pre code.hljs { background: #1a1d23; }
body.dark-mode.template-codex .preview-content pre code { background: none; color: inherit; border: none; padding: 0; font-size: inherit; border-radius: 0; }
body.dark-mode.template-codex .preview-content code { background: #1e1e3a; border-color: #2d2d4a; }
body.dark-mode.template-codex .preview-content table { border-color: #2d2d4a; box-shadow: none; }
body.dark-mode.template-codex .preview-content table th { background: #0f0f1e; }
body.dark-mode.template-codex .preview-content table td { border-color: #2d2d4a; }
body.dark-mode.template-codex .preview-content hr { background: linear-gradient(90deg, transparent 0%, var(--accent) 50%, transparent 100%); }
body.dark-mode.template-codex .preview-content img { border-color: #2d2d4a; box-shadow: 0 15px 35px rgba(0,0,0,0.15); }
body.dark-mode.template-codex .preview-content mark { background: #1e1e3a; }
body.dark-mode .theme-dot.active { border-color: #fff; box-shadow: 0 0 0 2px var(--surface), 0 0 0 4px var(--dot-clr); }
body.dark-mode .sidebar { background: var(--surface); border-color: var(--border-light); }
body.dark-mode .sb-slider { background: #2d2d4a; border-color: #3d3d5c; color: var(--text); }
body.dark-mode .emoji-picker { background: var(--surface); }
body.dark-mode .emoji-item:hover { background: #2d2d4a; }
body.dark-mode .shortcuts-modal { background: var(--surface); }
body.dark-mode .shortcuts-modal h3 { color: var(--text-heading); }
body.dark-mode .shortcuts-grid span:last-child { color: var(--text-secondary); }
body.dark-mode .ai-input { background: #2d2d4a; border-color: #3d3d5c; color: var(--text); }
body.dark-mode .ai-input:focus { border-color: var(--accent); }
body.dark-mode .editor-toolbar { background: var(--surface); border-color: var(--border-light); }
body.dark-mode .pv-header { background: var(--surface); border-color: var(--border-light); }
body.dark-mode .tb-btn { color: var(--text-secondary); }
body.dark-mode .tb-btn:hover { background: #2d2d4a; color: var(--accent-text); }
body.dark-mode .tb-btn.tb-copy { background: var(--accent); color: #fff; }
body.dark-mode .tb-btn.tb-copy:hover { background: var(--accent-hover); }
body.dark-mode .tb-select { background: #2d2d4a; border-color: #3d3d5c; color: var(--text); }
body.dark-mode .tb-select:focus { border-color: var(--accent); }
body.dark-mode .hdr-btn { color: var(--text-secondary); }
body.dark-mode .hdr-btn:hover { background: #2d2d4a; color: var(--accent-text); }
body.dark-mode .hdr-btn.active { background: #2d2d4a; color: var(--accent-text); }
body.dark-mode .editor-footer { background: var(--surface); border-color: var(--border-light); }
body.dark-mode .editor-footer .tb-btn { color: var(--text-secondary); }
body.dark-mode .editor-footer .tb-btn:hover { color: var(--accent-text); }
body.dark-mode .editor-footer .hd-copy { background: var(--accent); color: #fff !important; }
body.dark-mode .editor-footer .hd-copy:hover { background: var(--accent-hover) !important; }
body.dark-mode .fs-footer { border-color: var(--border-light); }

#previewToggleToolbarBtn { display: none; }

/* ===== Responsive ===== */
@media (max-width: 900px) {
  .logo-text { display: none; }
  #previewToggleToolbarBtn { display: inline-flex; }
  body.preview-mode #previewCloseBtn { display: block; }

  .file-sidebar { width: 0; border: none; }
  .file-sidebar.collapsed { display: none; }
  .file-sidebar:not(.collapsed) { position: fixed; left: 0; top: 48px; bottom: 32px; width: 200px; z-index: 50; box-shadow: 4px 0 20px rgba(0,0,0,0.15); }

  .pane-preview { display: none; }
  .pane-editor { flex: 1; max-height: none; }
  body.preview-mode .pane-editor { display: none; }
  body.preview-mode .pane-preview { display: flex; flex: 1; min-height: 0; overflow: hidden; }
  body.preview-mode .preview-scroll { min-height: 0; }

  .sidebar { width: 100%; border-left: none; border-top: 1px solid var(--border-light); max-height: 40vh; }
  .main-layout { flex-direction: column; }
  .split-pane { flex-direction: column; min-height: 0; }
  .split-divider { display: none; }
  .preview-content { padding: 20px 16px; }
  .hdr-btn { font-size: 14px; padding: 3px 7px; }
  .hdr-group .hdr-btn { font-size: 14px; }
  #hdrThemes .theme-dot { width: 15px; height: 15px; }
  .shortcuts-modal { width: 95%; padding: 16px; }
}

@keyframes fadeIn { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: translateY(0); } }