/* ================================================================
   mdWebview — Style System
   5 Themes · Glassmorphism · Micro-animations · CJK Typography
   ================================================================ */

/* ── Reset ──────────────────────────────────────────────────── */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  --sidebar-font-size: calc(var(--content-font-size, 16px) * 0.8125);
  --content-text-align: justify;
  --content-line-height: 1.8;
  --content-max-width: 800px;
  /* Global fallbacks for undefined variable references */
  --text-normal: var(--text-primary);
  --border-color: var(--border);
  --accent-color: var(--accent);
  overflow: hidden;
  height: 100%;
  width: 100%;
}

body {
  font-family: 'Inter', 'Noto Serif TC', -apple-system, BlinkMacSystemFont, sans-serif;
  overflow: hidden;
  height: 100%;
  width: 100%;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
}

/* ── Theme 1: Obsidian Dark (Default) ──────────────────────── */
[data-theme="obsidian-dark"] {
  --bg-primary: #1e1e2e;
  --bg-secondary: #181825;
  --bg-tertiary: #313244;
  --bg-elevated: #45475a;
  --text-primary: #cdd6f4;
  --text-secondary: #a6adc8;
  --text-muted: #6c7086;
  --accent: #cba6f7;
  --accent-dim: rgba(203, 166, 247, 0.15);
  --accent-hover: #b4befe;
  --border: #45475a;
  --border-subtle: #313244;
  --sidebar-bg: rgba(24, 24, 37, 0.88);
  --sidebar-blur: 16px;
  --hover-bg: rgba(69, 71, 90, 0.45);
  --active-bg: rgba(203, 166, 247, 0.12);
  --scrollbar-track: #181825;
  --scrollbar-thumb: #45475a;
  --scrollbar-thumb-hover: #585b70;
  --search-highlight: rgba(249, 226, 175, 0.35);
  --search-active: rgba(249, 226, 175, 0.7);
  --heading-color: #cba6f7;
  --h2-color: #89b4fa;
  --h3-color: #94e2d5;
  --link-color: #89b4fa;
  --code-bg: rgba(49, 50, 68, 0.7);
  --blockquote-border: #cba6f7;
  --blockquote-bg: rgba(203, 166, 247, 0.05);
  --table-header-bg: rgba(69, 71, 90, 0.5);
  --table-stripe: rgba(49, 50, 68, 0.3);
  --shadow-color: rgba(0, 0, 0, 0.3);
  --header-bg: rgba(24, 24, 37, 0.92);
  --input-bg: #313244;
  --badge-bg: #45475a;
  --loading-bg: rgba(30, 30, 46, 0.85);
}

/* ── Theme 2: Obsidian Light ───────────────────────────────── */
[data-theme="obsidian-light"] {
  --bg-primary: #eff1f5;
  --bg-secondary: #e6e9ef;
  --bg-tertiary: #ccd0da;
  --bg-elevated: #bcc0cc;
  --text-primary: #4c4f69;
  --text-secondary: #5c5f77;
  --text-muted: #9ca0b0;
  --accent: #7287fd;
  --accent-dim: rgba(114, 135, 253, 0.12);
  --accent-hover: #8839ef;
  --border: #ccd0da;
  --border-subtle: #dce0e8;
  --sidebar-bg: rgba(230, 233, 239, 0.92);
  --sidebar-blur: 16px;
  --hover-bg: rgba(172, 176, 190, 0.25);
  --active-bg: rgba(114, 135, 253, 0.1);
  --scrollbar-track: #e6e9ef;
  --scrollbar-thumb: #bcc0cc;
  --scrollbar-thumb-hover: #9ca0b0;
  --search-highlight: rgba(223, 142, 29, 0.25);
  --search-active: rgba(223, 142, 29, 0.5);
  --heading-color: #7287fd;
  --h2-color: #1e66f5;
  --h3-color: #179299;
  --link-color: #1e66f5;
  --code-bg: rgba(204, 208, 218, 0.5);
  --blockquote-border: #7287fd;
  --blockquote-bg: rgba(114, 135, 253, 0.05);
  --table-header-bg: rgba(204, 208, 218, 0.5);
  --table-stripe: rgba(230, 233, 239, 0.5);
  --shadow-color: rgba(0, 0, 0, 0.08);
  --header-bg: rgba(230, 233, 239, 0.95);
  --input-bg: #dce0e8;
  --badge-bg: #ccd0da;
  --loading-bg: rgba(239, 241, 245, 0.85);
}

/* ── Theme 3: Solarized ────────────────────────────────────── */
[data-theme="solarized"] {
  --bg-primary: #073642;
  --bg-secondary: #002b36;
  --bg-tertiary: #05232c;
  --bg-elevated: #1a5a6a;
  --text-primary: #93a1a1;
  --text-secondary: #839496;
  --text-muted: #586e75;
  --accent: #b58900;
  --accent-dim: rgba(181, 137, 0, 0.12);
  --accent-hover: #cb4b16;
  --border: #2a4f5a;
  --border-subtle: #0a4050;
  --sidebar-bg: rgba(0, 43, 54, 0.92);
  --sidebar-blur: 16px;
  --hover-bg: rgba(88, 110, 117, 0.2);
  --active-bg: rgba(181, 137, 0, 0.12);
  --scrollbar-track: #002b36;
  --scrollbar-thumb: #2a4f5a;
  --scrollbar-thumb-hover: #586e75;
  --search-highlight: rgba(181, 137, 0, 0.3);
  --search-active: rgba(181, 137, 0, 0.6);
  --heading-color: #b58900;
  --h2-color: #268bd2;
  --h3-color: #2aa198;
  --link-color: #268bd2;
  --code-bg: rgba(0, 43, 54, 0.8);
  --blockquote-border: #b58900;
  --blockquote-bg: rgba(181, 137, 0, 0.05);
  --table-header-bg: rgba(0, 43, 54, 0.7);
  --table-stripe: rgba(9, 65, 81, 0.3);
  --shadow-color: rgba(0, 0, 0, 0.35);
  --header-bg: rgba(0, 43, 54, 0.95);
  --input-bg: #05232c;
  --badge-bg: #2a4f5a;
  --loading-bg: rgba(7, 54, 66, 0.85);
}

/* ── Theme 4: 禪風 Zen ─────────────────────────────────────── */
[data-theme="zen"] {
  --bg-primary: #f5f0e8;
  --bg-secondary: #ece5d8;
  --bg-tertiary: #e0d6c4;
  --bg-elevated: #d4c9b6;
  --text-primary: #3a3226;
  --text-secondary: #5a4e3e;
  --text-muted: #8a7e6e;
  --accent: #7a6548;
  --accent-dim: rgba(122, 101, 72, 0.1);
  --accent-hover: #5c4a32;
  --border: #d4c9b6;
  --border-subtle: #e0d6c4;
  --sidebar-bg: rgba(236, 229, 216, 0.94);
  --sidebar-blur: 16px;
  --hover-bg: rgba(139, 115, 85, 0.1);
  --active-bg: rgba(139, 115, 85, 0.12);
  --scrollbar-track: #ece5d8;
  --scrollbar-thumb: #d4c9b6;
  --scrollbar-thumb-hover: #c4b8a4;
  --search-highlight: rgba(163, 130, 82, 0.25);
  --search-active: rgba(163, 130, 82, 0.5);
  --heading-color: #5c4a32;
  --h2-color: #6d5a42;
  --h3-color: #7a6548;
  --link-color: #6d5a42;
  --code-bg: rgba(224, 214, 196, 0.6);
  --blockquote-border: #7a6548;
  --blockquote-bg: rgba(122, 101, 72, 0.05);
  --table-header-bg: rgba(212, 201, 182, 0.5);
  --table-stripe: rgba(236, 229, 216, 0.5);
  --shadow-color: rgba(90, 78, 62, 0.1);
  --header-bg: rgba(236, 229, 216, 0.96);
  --input-bg: #e0d6c4;
  --badge-bg: #d4c9b6;
  --loading-bg: rgba(245, 240, 232, 0.85);
}

/* ── Theme 5: Gruvbox ────────────────────────────── */
[data-theme="gruvbox"] {
  --bg-primary: #282828;
  --bg-secondary: #1d2021;
  --bg-tertiary: #32302f;
  --bg-elevated: #504945;
  --text-primary: #ebdbb2;
  --text-secondary: #d5c4a1;
  --text-muted: #a89984;
  --accent: #fe8019;
  --accent-dim: rgba(254, 128, 25, 0.15);
  --accent-hover: #fabd2f;
  --border: #3c3836;
  --border-subtle: #504945;
  --sidebar-bg: rgba(29, 32, 33, 0.94);
  --sidebar-blur: 16px;
  --hover-bg: rgba(235, 219, 178, 0.08);
  --active-bg: rgba(235, 219, 178, 0.12);
  --scrollbar-track: #1d2021;
  --scrollbar-thumb: #504945;
  --scrollbar-thumb-hover: #665c54;
  --search-highlight: rgba(250, 189, 47, 0.35);
  --search-active: rgba(250, 189, 47, 0.65);
  --heading-color: #fabd2f;
  --h2-color: #ebdbb2;
  --h3-color: #d5c4a1;
  --link-color: #83a598;
  --code-bg: rgba(60, 56, 54, 0.8);
  --blockquote-border: #fe8019;
  --blockquote-bg: rgba(254, 128, 25, 0.05);
  --table-header-bg: rgba(80, 73, 69, 0.6);
  --table-stripe: rgba(60, 56, 54, 0.3);
  --shadow-color: rgba(0, 0, 0, 0.5);
  --header-bg: rgba(29, 32, 33, 0.96);
  --input-bg: #3c3836;
  --badge-bg: #504945;
  --loading-bg: rgba(40, 40, 40, 0.85);
}

/* ── Smooth Theme Transition ───────────────────────────────── */
html {
  transition: background-color 0.4s ease, color 0.4s ease;
}

body,
.app-header,
.sidebar,
.content,
.sidebar-tab,
.sidebar-panel,
.file-tree,
.search-input,
.theme-select,
.control-btn,
.tree-item-row,
.toc-item,
.search-result-item,
.page-search-bar,
.page-search-input,
.markdown-body {
  transition: background-color 0.4s ease, color 0.4s ease, border-color 0.4s ease;
}

/* ── App Layout ────────────────────────────────────────────── */
.app {
  display: flex;
  flex-direction: column;
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  height: 100%;
  width: 100%;
  overflow: hidden;
  background: var(--bg-primary);
  color: var(--text-primary);
}

/* ── Header ────────────────────────────────────────────────── */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 48px;
  min-height: 48px;
  padding: 0 16px;
  background: var(--header-bg);
  backdrop-filter: blur(12px);
  will-change: transform;
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
  z-index: 100;
  user-select: none;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 16px;
}

.sidebar-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  border-radius: 6px;
  transition: all 0.2s ease;
  will-change: transform, opacity;
}
.sidebar-toggle:hover {
  background: var(--hover-bg);
  color: var(--text-primary);
}

.app-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  user-select: none;
}
.app-logo:hover {
  opacity: 0.8;
}
.logo-icon {
  font-size: 22px;
  line-height: 1;
}
.logo-text {
  font-family: 'Inter', sans-serif;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: -0.3px;
  color: var(--text-primary);
}

/* ── Header Controls ───────────────────────────────────────── */
.font-size-controls {
  display: flex;
  align-items: center;
  gap: 4px;
  background: var(--bg-tertiary);
  border-radius: 8px;
  padding: 2px;
}

.control-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 32px;
  height: 28px;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-family: 'Inter', sans-serif;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  border-radius: 6px;
  transition: all 0.15s ease;
  padding: 0 6px;
}
.control-btn:hover {
  background: var(--hover-bg);
  color: var(--text-primary);
}
.control-btn:active {
  transform: scale(0.95);
}

.small-minus, .small-plus {
  font-size: 11px;
  margin-left: 1px;
  vertical-align: super;
}

.font-size-display {
  font-family: 'Inter', sans-serif;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-muted);
  min-width: 24px;
  text-align: center;
}

.theme-select {
  appearance: none;
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  padding: 5px 28px 5px 10px;
  font-family: 'Inter', sans-serif;
  font-size: 12px;
  cursor: pointer;
  outline: none;
  transition: all 0.2s ease;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%236c7086' viewBox='0 0 16 16'%3E%3Cpath d='M1.646 4.646a.5.5 0 0 1 .708 0L8 10.293l5.646-5.647a.5.5 0 0 1 .708.708l-6 6a.5.5 0 0 1-.708 0l-6-6a.5.5 0 0 1 0-.708z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 8px center;
}
.theme-select:hover {
  border-color: var(--accent);
}
.theme-select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-dim);
}

/* ── App Body ──────────────────────────────────────────────── */
.app-body {
  display: flex;
  flex: 1;
  overflow: hidden;
  position: relative;
}

/* ── Sidebar ───────────────────────────────────────────────── */
.sidebar {
  width: 300px;
  min-width: 220px;
  max-width: 500px;
  display: flex;
  flex-direction: column;
  background: var(--sidebar-bg);
  backdrop-filter: blur(var(--sidebar-blur));
  will-change: transform;
  -webkit-backdrop-filter: blur(var(--sidebar-blur));
  border-right: 1px solid var(--border-subtle);
  overflow: hidden;
  flex-shrink: 0;
  z-index: 10;
  font-size: var(--sidebar-font-size);
}

.sidebar.collapsed {
  width: 0;
  min-width: 0;
  border-right: none;
  overflow: hidden;
}

/* ── Sidebar Tabs ──────────────────────────────────────────── */
.sidebar-tabs {
  display: flex;
  border-bottom: 1px solid var(--border-subtle);
  background: var(--bg-secondary);
  flex-shrink: 0;
}

.sidebar-tab {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  height: 40px;
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-family: 'Inter', 'Noto Serif TC', sans-serif;
  font-size: calc(var(--sidebar-font-size) * 12 / 13);
  font-weight: 500;
  cursor: pointer;
  position: relative;
  transition: all 0.2s ease;
  border-bottom: 2px solid transparent;
}

.sidebar-tab:hover {
  color: var(--text-secondary);
  background: var(--hover-bg);
}

.sidebar-tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.tab-icon-svg {
  width: 15px;
  height: 15px;
  flex-shrink: 0;
}

.tab-label {
  font-size: calc(var(--sidebar-font-size) * 11 / 13);
  letter-spacing: 0.3px;
}

/* ── Sidebar Panels ────────────────────────────────────────── */
.sidebar-panel {
  display: none;
  flex-direction: column;
  flex: 1;
  overflow: hidden;
  animation: fadeIn 0.2s ease;
}

.sidebar-panel.active {
  display: flex;
}

.panel-header {
  padding: 10px 16px 8px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
}

.panel-header h3 {
  font-family: 'Inter', sans-serif;
  font-size: calc(var(--sidebar-font-size) * 11 / 13);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
  flex: 1;
  min-width: 0;
}

/* ── Panel Action Toolbar ──────────────────────────────────── */
.panel-actions {
  display: flex;
  align-items: center;
  gap: 2px;
  flex-shrink: 0;
}

.panel-action-btn {
  display: flex;
  align-items: center;
  gap: 3px;
  padding: 3px 6px;
  border: none;
  border-radius: 4px;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  font-size: calc(var(--sidebar-font-size) * 0.85);
  font-family: 'Inter', sans-serif;
  transition: background 0.15s, color 0.15s;
  line-height: 1;
}
.panel-action-btn:hover {
  background: var(--hover-bg);
  color: var(--text-normal);
}
.panel-action-btn svg {
  flex-shrink: 0;
  opacity: 0.8;
}
.panel-action-label {
  max-width: 48px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* ── Sort Dropdown ─────────────────────────────────────────── */
.panel-action-group {
  position: relative;
}

.sort-dropdown {
  position: absolute;
  top: calc(100% + 4px);
  right: 0;
  min-width: 130px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.3);
  padding: 4px;
  z-index: 200;
  display: none;
  flex-direction: column;
  gap: 1px;
  animation: dropdownFadeIn 0.12s ease;
  will-change: transform, opacity;
}
.sort-dropdown.open {
  display: flex;
}
@keyframes dropdownFadeIn {
  from { opacity: 0; transform: translateY(-4px); }
  to   { opacity: 1; transform: translateY(0); }
}

.sort-option {
  display: block;
  width: 100%;
  padding: 6px 10px;
  border: none;
  border-radius: 4px;
  background: transparent;
  color: var(--text-normal);
  font-size: calc(var(--sidebar-font-size) * 0.92);
  font-family: 'Inter', sans-serif;
  text-align: left;
  cursor: pointer;
  transition: background 0.12s;
}
.sort-option:hover {
  background: var(--hover-bg);
}
.sort-option.active {
  color: var(--accent-color);
  font-weight: 600;
}

/* ── TOC Group (collapsible headings) ──────────────────────── */
.toc-group {
  margin-bottom: 1px;
}
.toc-group-header {
  display: flex;
  align-items: center;
  gap: 4px;
  width: 100%;
  padding: 4px 12px;
  border: none;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  font-size: calc(var(--sidebar-font-size) * 0.85);
  font-family: 'Inter', sans-serif;
  font-weight: 600;
  text-align: left;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  transition: color 0.15s;
}
.toc-group-header:hover {
  color: var(--text-normal);
}
.toc-group-chevron {
  font-size: 10px;
  transition: transform 0.2s;
  opacity: 0.7;
}
.toc-group-chevron.expanded {
  transform: rotate(90deg);
}
.toc-group-children {
  display: none;
}
.toc-group-children.expanded {
  display: block;
}

/* ── Search Result Group Collapse ──────────────────────────── */
.search-result-group .search-result-file {
  cursor: pointer;
  user-select: none;
}
.search-result-file-chevron {
  font-size: 10px;
  margin-right: 4px;
  transition: transform 0.2s;
  display: inline-block;
  opacity: 0.7;
}
.search-result-file-chevron.collapsed {
  transform: rotate(-90deg);
}
.search-result-group-body {
  display: block;
}
.search-result-group-body.collapsed {
  display: none;
}

.panel-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 40px 16px;
  color: var(--text-muted);
  font-size: var(--sidebar-font-size);
  text-align: center;
}

.placeholder-icon {
  font-size: calc(var(--sidebar-font-size) * 28 / 13);
  opacity: 0.5;
}

/* ── File Tree ─────────────────────────────────────────────── */
.file-tree {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 4px 0 60px 0;
  -webkit-overflow-scrolling: touch;
}

.tree-loading {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 32px 16px;
  color: var(--text-muted);
  font-size: var(--sidebar-font-size);
}

.tree-item {
  user-select: none;
}

.tree-item-row {
  display: flex;
  align-items: flex-start;
  min-height: 32px;
  height: auto;
  padding: 6px 12px;
  cursor: pointer;
  border-radius: 0;
  transition: all 0.1s ease;
  position: relative;
  gap: 6px;
  color: var(--text-secondary);
  font-size: var(--sidebar-font-size);
}

.tree-item-row:hover {
  background: var(--hover-bg);
  color: var(--text-primary);
}

.tree-item-row.active {
  background: var(--active-bg);
  color: var(--accent);
}

.tree-item-row.active::before {
  content: '';
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 2px;
  background: var(--accent);
  border-radius: 0 2px 2px 0;
}

.tree-chevron {
  width: 16px;
  height: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--text-muted);
  transition: transform 0.2s ease;
  font-size: calc(var(--sidebar-font-size) * 10 / 13);
  margin-top: 2px;
}

.tree-chevron.expanded {
  transform: rotate(90deg);
}

.tree-icon {
  flex-shrink: 0;
  font-size: calc(var(--sidebar-font-size) * 14 / 13);
  line-height: 1;
  margin-top: 2px;
}

.tree-name {
  flex: 1;
  min-width: 0;
  white-space: normal;
  word-break: break-word;
  overflow-wrap: break-word;
  line-height: 1.35;
  font-family: 'Noto Serif TC', 'Inter', sans-serif;
  font-size: var(--sidebar-font-size);
}

.tree-children {
  display: none;
}

.tree-children.expanded {
  display: block;
}

.tree-file-count {
  font-size: calc(var(--sidebar-font-size) * 10 / 13);
  color: var(--text-muted);
  margin-left: auto;
  margin-top: 2px;
  padding: 1px 6px;
  flex-shrink: 0;
}
  background: var(--badge-bg);
  border-radius: 10px;
  flex-shrink: 0;
}

/* ── Search ────────────────────────────────────────────────── */
.search-folder-wrapper {
  width: 98%;
  margin: 0 auto 6px;
  padding: 0;
  box-sizing: border-box;
  flex-shrink: 0;
}

.search-folder-select {
  width: 100%;
  height: 30px;
  padding: 0 8px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  color: var(--text-primary);
  font-family: 'Noto Serif TC', 'Inter', sans-serif;
  font-size: calc(var(--sidebar-font-size) * 11 / 13);
  outline: none;
  cursor: pointer;
  transition: all 0.2s ease;
  white-space: nowrap;
  text-overflow: ellipsis;
  box-sizing: border-box;
}

.search-folder-select:focus,
.search-folder-select:hover {
  border-color: var(--accent);
}

.search-input-wrapper {
  display: flex;
  align-items: center;
  gap: 6px;
  width: 98%;
  margin: 0 auto 8px;
  padding: 0;
  box-sizing: border-box;
  flex-shrink: 0;
}

.search-input {
  flex: 1;
  min-width: 0;
  height: 32px;
  padding: 0 10px;
  background: var(--input-bg);
  border: 1px solid var(--border-subtle);
  border-radius: 6px;
  color: var(--text-primary);
  font-family: 'Noto Serif TC', 'Inter', sans-serif;
  font-size: var(--sidebar-font-size);
  outline: none;
  transition: all 0.2s ease;
  box-sizing: border-box;
}
.search-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-dim);
}
.search-input::placeholder {
  color: var(--text-muted);
}

.search-go-btn {
  width: 32px;
  height: 32px;
  border: none;
  background: var(--accent);
  color: var(--bg-primary);
  border-radius: 6px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s ease;
  flex-shrink: 0;
  box-sizing: border-box;
}
}
.search-go-btn:hover {
  opacity: 0.85;
  transform: scale(1.05);
}
.search-go-btn:active {
  transform: scale(0.95);
}

.search-results {
  flex: 1;
  overflow-y: auto;
  padding: 0 4px;
}

.search-status {
  padding: 8px 12px;
  font-size: calc(var(--sidebar-font-size) * 11 / 13);
  color: var(--text-muted);
  border-bottom: 1px solid var(--border-subtle);
}

.search-result-group {
  margin-bottom: 4px;
}

.search-result-file {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  font-size: calc(var(--sidebar-font-size) * 12 / 13);
  font-weight: 600;
  color: var(--accent);
  cursor: pointer;
  user-select: none;
  border-radius: 4px;
  transition: background 0.1s;
}
.search-result-file:hover {
  background: var(--hover-bg);
}

.search-result-file-icon {
  font-size: calc(var(--sidebar-font-size) * 12 / 13);
  opacity: 0.7;
  flex-shrink: 0;
}

.search-result-count {
  margin-left: auto;
  font-size: calc(var(--sidebar-font-size) * 10 / 13);
  font-weight: normal;
  color: var(--text-muted);
  background: var(--hover-bg);
  padding: 1px 5px;
  border-radius: 8px;
  flex-shrink: 0;
}

.search-result-item {
  display: flex;
  flex-direction: column;
  padding: 5px 12px 5px 30px;
  cursor: pointer;
  border-radius: 4px;
  margin: 0 4px;
  transition: background 0.1s ease;
}

.search-result-item:hover {
  background: var(--hover-bg);
}

.search-result-line {
  font-size: calc(var(--sidebar-font-size) * 10 / 13);
  color: var(--text-muted);
  margin-bottom: 2px;
}

.search-result-snippet {
  font-size: calc(var(--sidebar-font-size) * 12 / 13);
  color: var(--text-secondary);
  line-height: 1.5;
  word-break: break-all;
}

.search-result-snippet mark {
  background: var(--search-highlight);
  color: var(--text-primary);
  border-radius: 2px;
  padding: 0 1px;
}

.search-loading {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 24px;
  color: var(--text-muted);
  font-size: var(--sidebar-font-size);
}

/* ── Obsidian-Style Outline / TOC ─────────────────────────── */
.toc-list {
  flex: 1;
  overflow-y: auto;
  padding: 6px 8px;
  position: relative;
}

.toc-item-row {
  display: flex;
  align-items: center;
  min-height: 28px;
  padding-top: 3px;
  padding-bottom: 3px;
  padding-right: 6px;
  margin: 1px 0;
  font-size: var(--sidebar-font-size);
  font-family: var(--font-sans), -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Noto Sans TC', sans-serif;
  color: var(--text-secondary);
  cursor: pointer;
  border-radius: 4px;
  transition: background 0.1s ease, color 0.1s ease;
  user-select: none;
  line-height: 1.35;
  position: relative;
}

.toc-item-row:hover {
  background: var(--hover-bg);
  color: var(--text-primary);
}

.toc-item-row.active {
  color: var(--accent);
  background: var(--active-bg);
  font-weight: 600;
}

/* Vertical tree guide line for nested outline items */
.toc-item-row.is-nested::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: var(--guide-left, 12px);
  width: 1px;
  background: var(--border);
  opacity: 0.4;
}

.toc-item-chevron {
  width: 16px;
  height: 16px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 9px;
  margin-right: 2px;
  flex-shrink: 0;
  transition: transform 0.15s ease, opacity 0.15s ease;
  opacity: 0.6;
  border-radius: 3px;
}

.toc-item-chevron:hover {
  opacity: 1;
  background: rgba(255, 255, 255, 0.12);
}

.toc-item-chevron.empty {
  visibility: hidden;
  pointer-events: none;
}

.toc-item-row.collapsed .toc-item-chevron {
  transform: rotate(-90deg);
}

.toc-item-label {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.toc-item-row.is-hidden {
  display: none !important;
}

/* ── Resize Handle ─────────────────────────────────────────── */
.resize-handle {
  width: 5px;
  cursor: col-resize;
  background: transparent;
  transition: background 0.2s ease;
  flex-shrink: 0;
  z-index: 20;
  position: relative;
}
.resize-handle::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 3px;
  height: 32px;
  background: var(--border-subtle);
  border-radius: 3px;
  opacity: 0;
  transition: opacity 0.2s ease;
}
.resize-handle:hover::after,
.resize-handle.active::after {
  opacity: 1;
  background: var(--accent);
}

/* ── Content Area ──────────────────────────────────────────── */
.content {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  background: var(--bg-primary);
  position: relative;
}

.content-wrapper {
  max-width: var(--content-max-width, 800px);
  width: 100%;
  margin: 0 auto;
  padding: 32px 48px 80px;
  transition: max-width 0.25s ease;
}

.content-header {
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-subtle);
}

.content-header .file-path-row {
  display: flex;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 8px;
}

.content-header .file-path {
  font-family: 'Inter', monospace;
  font-size: 11px;
  color: var(--text-muted);
  letter-spacing: 0.3px;
  flex: 1;
  min-width: 0;
  white-space: normal;
  word-break: break-word;
  overflow-wrap: break-word;
  line-height: 1.4;
}

/* Copy-link button */
.copy-link-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 8px;
  border: 1px solid var(--border-color);
  border-radius: 5px;
  background: transparent;
  color: var(--text-muted);
  font-size: 11px;
  font-family: 'Inter', sans-serif;
  cursor: pointer;
  flex-shrink: 0;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
  opacity: 0;
  pointer-events: none;
}
.content-header:hover .copy-link-btn,
.copy-link-btn.copied {
  opacity: 1;
  pointer-events: auto;
}
.copy-link-btn:hover {
  background: var(--hover-bg);
  color: var(--text-normal);
  border-color: var(--accent-color);
}
.copy-link-btn.copied {
  color: var(--accent-color);
  border-color: var(--accent-color);
}


.content-header .file-title {
  font-family: 'Noto Serif TC', serif;
  font-size: 1.8em;
  font-weight: 700;
  color: var(--heading-color);
  line-height: 1.3;
}

.content-header .file-meta {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 6px;
}

/* ── Welcome Screen ────────────────────────────────────────── */
.welcome-screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  text-align: center;
  animation: fadeIn 0.6s ease;
}

.welcome-lotus {
  font-size: 72px;
  margin-bottom: 16px;
  animation: float 3s ease-in-out infinite;
}

.welcome-title {
  font-family: 'Inter', sans-serif;
  font-size: 36px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -1px;
  margin-bottom: 4px;
}

.welcome-subtitle {
  font-family: 'Noto Serif TC', serif;
  font-size: 16px;
  color: var(--text-muted);
  letter-spacing: 4px;
}

.welcome-divider {
  width: 60px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  margin: 24px 0;
}

.welcome-hint {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.welcome-shortcuts {
  display: flex;
  gap: 20px;
}

.shortcut-item {
  font-size: 11px;
  color: var(--text-muted);
}

.welcome-footer {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-top: 24px;
  font-size: 12px;
  color: var(--text-muted);
  flex-wrap: wrap;
}

.welcome-footer-sep {
  opacity: 0.5;
}

.welcome-download-link {
  color: var(--accent);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.15s ease;
}

.welcome-download-link:hover {
  color: var(--accent-hover);
  text-decoration: underline;
}

kbd {
  display: inline-block;
  padding: 2px 6px;
  font-family: 'Inter', monospace;
  font-size: 10px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-secondary);
  margin: 0 2px;
}

/* ── Back to Top ───────────────────────────────────────────── */
.back-to-top {
  position: fixed;
  bottom: 28px;
  right: 28px;
  width: 40px;
  height: 40px;
  border: none;
  background: var(--accent);
  color: var(--bg-primary);
  font-size: 18px;
  font-weight: 700;
  border-radius: 50%;
  cursor: pointer;
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.3s ease;
  box-shadow: 0 4px 12px var(--shadow-color);
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: center;
}

.back-to-top.visible {
  opacity: 1;
  transform: translateY(0);
}

.back-to-top:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px var(--shadow-color);
}

/* ── Content Loading ───────────────────────────────────────── */
.content-loading {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  background: var(--loading-bg);
  backdrop-filter: blur(4px);
  color: var(--text-muted);
  font-size: 14px;
  z-index: 30;
}

/* ── Spinner ───────────────────────────────────────────────── */
.spinner {
  width: 18px;
  height: 18px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

.spinner.large {
  width: 32px;
  height: 32px;
  border-width: 3px;
}

/* ── Page Search Bar ───────────────────────────────────────── */
.page-search-bar {
  position: fixed;
  top: 56px;
  right: 20px;
  z-index: 200;
  opacity: 0;
  transform: translateY(-10px) scale(0.97);
  pointer-events: none;
  transition: all 0.2s ease;
}

.page-search-bar.visible {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: all;
}

.page-search-inner {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: 0 8px 32px var(--shadow-color);
  backdrop-filter: blur(12px);
}

.page-search-icon {
  color: var(--text-muted);
  flex-shrink: 0;
}

.page-search-input {
  width: 220px;
  height: 28px;
  border: none;
  background: transparent;
  color: var(--text-primary);
  font-family: 'Noto Serif TC', 'Inter', sans-serif;
  font-size: 13px;
  outline: none;
}
.page-search-input::placeholder {
  color: var(--text-muted);
}

.page-search-count {
  font-family: 'Inter', monospace;
  font-size: 11px;
  color: var(--text-muted);
  white-space: nowrap;
  min-width: 36px;
  text-align: center;
}

.page-search-nav,
.page-search-close {
  width: 26px;
  height: 26px;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s ease;
}
.page-search-nav:hover,
.page-search-close:hover {
  background: var(--hover-bg);
  color: var(--text-primary);
}

/* ── Markdown Body ─────────────────────────────────────────── */
.markdown-body {
  font-family: 'Noto Serif TC', serif;
  font-size: var(--content-font-size, 16px);
  text-align: var(--content-text-align, justify);
  line-height: var(--content-line-height, 1.8);
  max-width: var(--content-max-width, 800px);
  margin-left: auto;
  margin-right: auto;
  color: var(--text-primary);
  word-break: break-word;
  overflow-wrap: break-word;
}

.markdown-body > *:first-child {
  margin-top: 0;
}

/* Headings */
.markdown-body h1 {
  font-size: 1.75em;
  font-weight: 700;
  color: var(--heading-color);
  margin: 2em 0 0.8em;
  padding-bottom: 0.4em;
  border-bottom: 1px solid var(--border-subtle);
  line-height: 1.3;
}

.markdown-body h2 {
  font-size: 1.45em;
  font-weight: 700;
  color: var(--h2-color);
  margin: 1.8em 0 0.6em;
  padding-left: 12px;
  border-left: 3px solid var(--h2-color);
  line-height: 1.35;
}

.markdown-body h3 {
  font-size: 1.2em;
  font-weight: 600;
  color: var(--h3-color);
  margin: 1.5em 0 0.5em;
  line-height: 1.4;
}

.markdown-body h4 {
  font-size: 1.05em;
  font-weight: 600;
  color: var(--text-primary);
  margin: 1.3em 0 0.4em;
}

.markdown-body h5,
.markdown-body h6 {
  font-size: 1em;
  font-weight: 600;
  color: var(--text-secondary);
  margin: 1.2em 0 0.4em;
}

/* Paragraphs */
.markdown-body p {
  margin: 0.8em 0;
}

/* Bold and Emphasis */
.markdown-body strong {
  font-weight: 700;
  color: var(--text-primary);
}

.markdown-body em {
  font-style: italic;
}

/* Links */
.markdown-body a {
  color: var(--link-color);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease;
}
.markdown-body a:hover {
  border-bottom-color: var(--link-color);
}

/* Lists */
.markdown-body ul,
.markdown-body ol {
  padding-left: 1.8em;
  margin: 0.6em 0;
}

.markdown-body li {
  margin: 0.3em 0;
  line-height: 1.75;
}

.markdown-body li > p {
  margin: 0.3em 0;
}

/* Blockquotes */
.markdown-body blockquote {
  margin: 1em 0;
  padding: 0.6em 1.2em;
  border-left: 3px solid var(--blockquote-border);
  background: var(--blockquote-bg);
  border-radius: 0 6px 6px 0;
  color: var(--text-secondary);
}

.markdown-body blockquote p:first-child {
  margin-top: 0;
}
.markdown-body blockquote p:last-child {
  margin-bottom: 0;
}

/* Code */
.markdown-body code {
  font-family: 'SF Mono', 'Menlo', 'Consolas', monospace;
  font-size: 0.88em;
  padding: 0.15em 0.4em;
  background: var(--code-bg);
  border-radius: 4px;
  color: var(--accent);
}

.markdown-body pre {
  margin: 1em 0;
  padding: 16px 20px;
  background: var(--code-bg);
  border-radius: 8px;
  overflow-x: auto;
  border: 1px solid var(--border-subtle);
}

.markdown-body pre code {
  background: none;
  padding: 0;
  border-radius: 0;
  font-size: 0.9em;
  color: var(--text-primary);
}

/* Tables */
.markdown-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 1em 0;
  font-size: 0.92em;
}

.markdown-body thead {
  background: var(--table-header-bg);
}

.markdown-body th,
.markdown-body td {
  padding: 8px 12px;
  border: 1px solid var(--border);
  text-align: left;
}

.markdown-body th {
  font-weight: 600;
  color: var(--text-primary);
}

.markdown-body tbody tr:nth-child(even) {
  background: var(--table-stripe);
}

/* Horizontal Rule */
.markdown-body hr {
  border: none;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border), transparent);
  margin: 2em 0;
}

/* Wikilinks (Obsidian [[internal links]]) */
.markdown-body .wikilink {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px dashed var(--accent);
  cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease;
  padding-bottom: 1px;
}

.markdown-body .wikilink:hover {
  color: var(--accent-hover);
  border-bottom-style: solid;
  border-bottom-color: var(--accent-hover);
}

/* Footnotes */
.markdown-body .footnote-ref {
  font-size: 0.75em;
  vertical-align: super;
  line-height: 0;
  color: var(--accent);
  cursor: pointer;
  text-decoration: none;
  padding: 0 2px;
  font-weight: 600;
  transition: color 0.15s ease;
}

.markdown-body .footnote-ref:hover {
  color: var(--accent-hover);
  text-decoration: none;
}

.footnotes {
  margin-top: 3.5em;
  padding-top: 1.5em;
  border-top: 1.5px solid var(--border-subtle);
  color: var(--text-secondary);
}

.footnotes-divider {
  display: none;
}

.footnotes-list {
  list-style: none;
  padding-left: 0;
  font-size: 0.9em;
  line-height: 1.7;
}

.footnote-item {
  margin-bottom: 1em;
  display: flex;
  align-items: start;
  padding: 4px 8px;
  border-radius: 4px;
  transition: background-color 0.3s ease;
}

.footnote-label {
  font-weight: 600;
  color: var(--accent);
  margin-right: 10px;
  flex-shrink: 0;
  user-select: none;
}

.footnote-item-content {
  flex: 1;
}

.footnote-item-content p {
  display: inline;
  margin: 0;
}

.footnote-backlink {
  color: var(--accent);
  text-decoration: none;
  margin-left: 6px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  transition: all 0.15s ease;
  display: inline-block;
}

.footnote-backlink:hover {
  color: var(--accent-hover);
  transform: translateX(-2px);
}

/* Highlight Flash Animation */
@keyframes flash-highlight {
  0% {
    background-color: var(--accent-dim);
    box-shadow: 0 0 0 2px var(--accent-dim);
  }
  100% {
    background-color: transparent;
    box-shadow: none;
  }
}

.highlight-flash {
  animation: flash-highlight 2s ease-out;
}

/* Images */
.markdown-body img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  margin: 1em 0;
}

/* Search highlight */
.search-highlight {
  background: var(--search-highlight);
  border-radius: 2px;
  padding: 0 1px;
  scroll-margin-top: 80px;
}

.search-highlight.active {
  background: var(--search-active);
  box-shadow: 0 0 0 2px var(--search-active);
}

/* ── Scrollbar ─────────────────────────────────────────────── */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--scrollbar-track);
}

::-webkit-scrollbar-thumb {
  background: var(--scrollbar-thumb);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--scrollbar-thumb-hover);
}

.file-tree::-webkit-scrollbar,
.search-results::-webkit-scrollbar,
.toc-list::-webkit-scrollbar {
  width: 5px;
}

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

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

@keyframes slideInFromLeft {
  from { opacity: 0; transform: translateX(-8px); }
  to { opacity: 1; transform: translateX(0); }
}

/* Staggered entrance for tree items */
.tree-item {
  animation: slideInFromLeft 0.2s ease both;
}

/* ── Responsive ────────────────────────────────────────────── */
@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    left: 0;
    top: 48px;
    bottom: 0;
    z-index: 90;
    box-shadow: 4px 0 24px var(--shadow-color);
    width: 280px;
    transform: translateX(0);
    transition: transform 0.3s ease;
  }

  .sidebar.collapsed {
    transform: translateX(-100%);
    width: 280px;
  }

  .resize-handle {
    display: none;
  }

  .content-wrapper {
    padding: 16px 12px 60px;
  }

  .file-title {
    font-size: 20px;
    line-height: 1.35;
  }

  .header-right {
    gap: 8px;
  }

  .tab-label {
    display: none;
  }

  .page-search-input {
    width: 140px;
  }

  .welcome-shortcuts {
    flex-direction: column;
    gap: 8px;
  }

  /* Setting Menu Mobile Optimization */
  .user-settings-card {
    width: 95vw;
    max-height: 90vh;
    padding: 16px;
    margin: 0;
  }

  .settings-tabs-nav {
    display: flex;
    overflow-x: auto;
    white-space: nowrap;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 6px;
    gap: 6px;
  }

  .settings-tab-btn {
    padding: 8px 12px;
    font-size: 13px;
    flex-shrink: 0;
  }

  .setting-item-row {
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
    padding: 10px 0;
  }

  .setting-item-label {
    width: 100%;
  }

  .setting-select {
    width: 100%;
    box-sizing: border-box;
    padding: 8px 10px;
  }

  .segmented-control {
    width: 100%;
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    box-sizing: border-box;
  }

  .segment-btn {
    flex: 1 1 45%;
    text-align: center;
    padding: 8px 4px;
    font-size: 12px;
    box-sizing: border-box;
  }

  .font-size-setting-controls {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
  }

  .user-settings-card .modal-actions .submit-btn {
    width: 100%;
    padding: 10px;
    font-size: 14px;
  }
}

@media (max-width: 480px) {
  .content-wrapper {
    padding: 12px 8px 50px;
  }

  .font-size-controls {
    display: none;
  }

  .logo-text {
    display: none;
  }

  .modal-card {
    padding: 16px;
  }

  .form-row {
    flex-direction: column;
    gap: 12px;
  }

  .setting-item-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
}

/* ── Print ─────────────────────────────────────────────────── */
@media print {
  .sidebar, .app-header, .page-search-bar, .back-to-top, .resize-handle {
    display: none !important;
  }
  .content-wrapper {
    max-width: 100%;
    padding: 0;
  }
  .markdown-body {
    color: #000;
  }
}

/* ── Admin Settings & Modals ───────────────────────────────── */
.settings-btn {
  margin-left: 6px;
}

.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  animation: fadeIn 0.25s ease-out;
}

.modal-card {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  box-shadow: 0 12px 40px var(--shadow-color);
  border-radius: 12px;
  width: 100%;
  max-width: 440px;
  padding: 28px;
  box-sizing: border-box;
  animation: slideInFromLeft 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.modal-card.settings-card {
  width: 92vw;
  max-width: 960px;
}

.modal-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
  position: relative;
}

.modal-close-btn {
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 6px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s ease;
}

.modal-close-btn:hover {
  background: var(--hover-bg);
  color: var(--text-primary);
}

.modal-icon {
  font-size: 24px;
}

.modal-header h2 {
  font-family: 'Inter', 'Noto Serif TC', sans-serif;
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
}

.modal-desc {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 20px;
}

.modal-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group-setting {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.setting-checkbox-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: 'Inter', sans-serif;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  user-select: none;
}

.setting-checkbox-label input[type="checkbox"] {
  width: 15px;
  height: 15px;
  accent-color: var(--accent);
  cursor: pointer;
}

.form-row {
  display: flex;
  gap: 16px;
}

.form-group.half {
  flex: 1;
}

.modal-form label {
  font-family: 'Inter', sans-serif;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
}

.modal-form input[type="text"],
.modal-form input[type="password"],
.modal-form input[type="number"] {
  font-family: inherit;
  height: 38px;
  padding: 0 12px;
  background: var(--input-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-primary);
  font-size: 14px;
  outline: none;
  transition: all 0.2s ease;
}

.modal-form input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-dim);
}

.theme-select-inline {
  font-family: inherit;
  height: 38px;
  padding: 0 10px;
  background: var(--input-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-primary);
  font-size: 14px;
  outline: none;
  cursor: pointer;
  transition: all 0.2s ease;
}

.theme-select-inline:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-dim);
}

.field-hint {
  font-size: 11px;
  color: var(--text-muted);
  line-height: 1.4;
}

.form-error {
  background: rgba(243, 139, 168, 0.15);
  color: #f38ba8;
  border: 1px solid rgba(243, 139, 168, 0.3);
  padding: 10px 12px;
  border-radius: 6px;
  font-size: 12.5px;
  line-height: 1.4;
}

.form-success {
  background: rgba(166, 227, 161, 0.15);
  color: #a6e3a1;
  border: 1px solid rgba(166, 227, 161, 0.3);
  padding: 10px 12px;
  border-radius: 6px;
  font-size: 12.5px;
  line-height: 1.4;
}

.modal-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 10px;
  gap: 12px;
}

.modal-right-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: center;
}

.modal-btn {
  height: 38px;
  padding: 0 16px;
  border-radius: 6px;
  font-size: 13.5px;
  font-weight: 550;
  cursor: pointer;
  transition: all 0.2s ease;
  border: none;
}

.submit-btn {
  background: var(--accent);
  color: var(--bg-primary);
}

.submit-btn:hover {
  filter: brightness(1.1);
}

.save-close-btn {
  background: var(--accent);
  color: var(--bg-primary);
  opacity: 0.9;
  border: 1px solid var(--accent);
}

.save-close-btn:hover {
  filter: brightness(1.15);
  opacity: 1;
}

.cancel-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-secondary);
}

.cancel-btn:hover {
  background: var(--hover-bg);
  color: var(--text-primary);
}

.logout-btn {
  background: rgba(243, 139, 168, 0.1);
  border: 1px solid rgba(243, 139, 168, 0.2);
  color: #f38ba8;
}

.logout-btn:hover {
  background: rgba(243, 139, 168, 0.2);
}

/* ── Selection Share Popup ── */
.selection-share-popup {
  position: absolute;
  z-index: 1000;
  display: none;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
  border-radius: 6px;
  padding: 4px;
  animation: popupFadeIn 0.15s ease;
  pointer-events: auto;
}

.selection-share-popup.visible {
  display: block;
}

.selection-share-popup button {
  display: flex;
  align-items: center;
  gap: 6px;
  background: transparent;
  border: none;
  color: var(--text-normal);
  padding: 6px 10px;
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  border-radius: 4px;
  transition: all 0.15s ease;
  white-space: nowrap;
}

.selection-share-popup button:hover {
  background: var(--hover-bg);
  color: var(--accent);
}

.selection-share-popup button.copied {
  color: var(--accent);
  font-weight: 600;
}

/* ── Line Highlight ── */
.line-highlight {
  position: relative;
  border-radius: 4px;
  animation: lineHighlightAnim 2.5s ease-out;
}

@keyframes lineHighlightAnim {
  0% {
    background-color: var(--search-highlight);
    box-shadow: 0 0 8px var(--search-highlight);
  }
  100% {
    background-color: transparent;
    box-shadow: none;
  }
}

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

/* ── User Settings & Preferences Menu Modal ───────────────────── */
.user-settings-card {
  max-width: 620px;
  width: 92vw;
  max-height: 88vh;
  display: flex;
  flex-direction: column;
  padding: 20px 24px;
  box-sizing: border-box;
  position: relative;
}

.user-settings-card .modal-header {
  flex-shrink: 0;
}

.settings-menu-body {
  flex: 1;
  overflow-y: auto;
  min-height: 0;
  padding-right: 4px;
  margin-top: 12px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  -webkit-overflow-scrolling: touch;
}

.user-settings-card .modal-actions {
  flex-shrink: 0;
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid var(--border-color);
}

.settings-tabs-nav {
  flex-shrink: 0;
  display: flex;
  gap: 6px;
  border-bottom: 1px solid var(--border-color);
  padding: 10px 0 8px 0;
  overflow-x: auto;
  white-space: nowrap;
  -webkit-overflow-scrolling: touch;
}

.settings-tab-btn {
  flex-shrink: 0;
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 500;
  padding: 8px 12px;
  border-radius: 6px;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.2s ease;
}

.settings-tab-btn:hover {
  background: var(--hover-bg);
  color: var(--text-primary);
}

.settings-tab-btn.active {
  background: var(--bg-tertiary);
  color: var(--accent);
  font-weight: 600;
}

.settings-tab-pane {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding-top: 8px;
}

.setting-item-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 10px 0;
  border-bottom: 1px dashed var(--border-color);
}

.setting-item-row:last-child {
  border-bottom: none;
}

.setting-item-label {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.setting-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
}

.setting-desc {
  font-size: 12px;
  color: var(--text-muted);
}

.setting-select {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 6px 12px;
  font-size: 13px;
  outline: none;
  cursor: pointer;
}

.font-size-setting-controls {
  display: flex;
  align-items: center;
  gap: 10px;
}

.font-size-display {
  font-size: 14px;
  font-weight: 600;
  color: var(--accent);
  min-width: 32px;
  text-align: center;
}

/* Segmented Control (Button Pills) */
.segmented-control {
  display: flex;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 3px;
  gap: 3px;
}

.segment-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 12px;
  padding: 6px 12px;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.15s ease;
  white-space: nowrap;
}

.segment-btn:hover {
  color: var(--text-primary);
}

.segment-btn.active {
  background: var(--accent);
  color: var(--bg-primary);
  font-weight: 600;
  box-shadow: 0 1px 4px rgba(0,0,0,0.2);
}

/* Recent Files & Bookmarks Lists */
.setting-section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-top: 8px;
  margin-bottom: 4px;
}

.text-action-btn {
  background: transparent;
  border: none;
  color: var(--accent);
  font-size: 12px;
  cursor: pointer;
  padding: 2px 6px;
  border-radius: 4px;
}

.text-action-btn:hover {
  background: var(--hover-bg);
  text-decoration: underline;
}

.recent-files-list, .bookmarks-list {
  max-height: 240px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 6px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 8px;
}

.list-item-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  padding: 8px 10px;
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.15s ease;
}

.list-item-row:hover {
  background: var(--hover-bg);
}

.list-item-title {
  font-size: 13px;
  color: var(--text-primary);
  font-weight: 500;
  white-space: normal;
  word-break: break-word;
  overflow-wrap: break-word;
  line-height: 1.35;
  flex: 1;
  min-width: 0;
}

.list-item-time {
  font-size: 11px;
  color: var(--text-muted);
  margin-left: 10px;
}

.list-item-del-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 12px;
  cursor: pointer;
  padding: 2px 6px;
  margin-left: 8px;
  border-radius: 4px;
}

.list-item-del-btn:hover {
  color: #f38ba8;
  background: rgba(243, 139, 168, 0.15);
}

.list-empty-hint {
  font-size: 12px;
  color: var(--text-muted);
  text-align: center;
  padding: 16px 0;
}

/* Bookmark Button in Header */
.bookmark-btn {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 12px;
  padding: 3px 8px;
  border-radius: 6px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-left: 8px;
  transition: all 0.2s ease;
}

.bookmark-btn:hover {
  background: var(--hover-bg);
  color: var(--text-primary);
}

.bookmark-btn.bookmarked {
  background: rgba(203, 166, 247, 0.15);
  border-color: var(--accent);
  color: var(--accent);
  font-weight: 600;
}

.admin-status-box {
  display: flex;
  flex-direction: column;
  gap: 12px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 16px;
  border-radius: 8px;
}

.status-info-row {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--text-primary);
}

.admin-action-buttons {
  display: flex;
  gap: 8px;
}

.setting-section-actions {
  display: flex;
  gap: 8px;
}

/* Toast Notification */
.toast-notification {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--accent);
  padding: 10px 20px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 500;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
  z-index: 10000;
  animation: toastFadeIn 0.25s ease-out;
}

/* ── Admin Tabs & Log Viewer ────────────────────────────── */
.admin-tabs-nav {
  display: flex;
  gap: 8px;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 16px;
  padding-bottom: 8px;
}

.admin-tab-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-family: inherit;
  font-size: 13px;
  font-weight: 500;
  padding: 6px 12px;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.admin-tab-btn:hover {
  color: var(--text-primary);
  background: var(--bg-hover);
}

.admin-tab-btn.active {
  color: var(--accent);
  background: var(--bg-tertiary);
  font-weight: 600;
}

.admin-logs-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

.admin-logs-count {
  font-size: 13px;
  color: var(--text-muted);
}

.admin-logs-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.admin-log-search {
  height: 36px;
  padding: 0 12px;
  background: var(--input-bg);
  border: 1px solid var(--border-subtle);
  border-radius: 6px;
  color: var(--text-primary);
  font-size: 15px;
  outline: none;
  width: 260px;
  box-sizing: border-box;
}

.admin-log-search:focus {
  border-color: var(--accent);
}

.small-btn {
  padding: 4px 12px !important;
  font-size: 13px !important;
  height: 36px !important;
}

.admin-log-viewer {
  background: #0d1117;
  color: #c9d1d9;
  border: 1px solid #30363d;
  border-radius: 8px;
  padding: 14px 16px;
  height: 480px;
  min-height: 250px;
  max-height: 80vh;
  resize: vertical;
  overflow-y: auto;
  font-family: 'JetBrains Mono', 'Fira Code', 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
  font-size: 16px;
  line-height: 1.65;
  white-space: pre-wrap;
  word-break: break-all;
  user-select: text;
  box-sizing: border-box;
  box-shadow: inset 0 2px 6px rgba(0, 0, 0, 0.4);
}

.log-entry {
  padding: 8px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 16px;
  font-family: inherit;
}

.log-entry:last-child {
  border-bottom: none;
}

.log-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 4px;
  flex-wrap: wrap;
}

.log-time {
  color: #8b949e;
  font-size: 14px;
}

.log-badge {
  display: inline-flex;
  align-items: center;
  padding: 1px 7px;
  border-radius: 4px;
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.5px;
  font-family: inherit;
  line-height: 1.2;
}

.log-badge.INFO {
  background: rgba(56, 139, 253, 0.2);
  color: #58a6ff;
  border: 1px solid rgba(56, 139, 253, 0.4);
}

.log-badge.WARN {
  background: rgba(210, 153, 34, 0.2);
  color: #d29922;
  border: 1px solid rgba(210, 153, 34, 0.4);
}

.log-badge.ERROR {
  background: rgba(248, 81, 73, 0.2);
  color: #f85149;
  border: 1px solid rgba(248, 81, 73, 0.4);
}

.log-badge.DEBUG {
  background: rgba(139, 148, 158, 0.2);
  color: #8b949e;
  border: 1px solid rgba(139, 148, 158, 0.4);
}

.log-tag {
  color: #bc8cff;
  font-weight: 600;
  font-size: 15px;
}

.log-msg {
  color: #e6edf3;
  font-size: 16px;
  line-height: 1.6;
  padding-left: 2px;
  word-break: break-all;
  white-space: pre-wrap;
}