/* ═══════════════════════════════════════════════════════════
   VoiceOfML Search — MD3 Design System
   ═══════════════════════════════════════════════════════════ */

/* ── CSS Variables (Dark Theme — Default) ────────────── */
:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "SF Mono", "Cascadia Code", "Consolas", "Menlo", monospace;

  --header-h: 48px;

  --surface: #1a1c1e;
  --surface-variant: #282a2d;
  --surface-container: #1e2022;
  --on-surface: #e2e2e6;
  --on-surface-variant: #c4c6cf;

  --primary: #8ab4f8;
  --on-primary: #003258;
  --primary-container: #004a7c;
  --on-primary-container: #d1e4ff;

  --secondary: #bcc7db;
  --on-secondary: #263141;
  --secondary-container: #3c4758;
  --on-secondary-container: #d8e3f8;

  --outline: #8d9099;
  --outline-variant: #43474e;

  --error: #f2b8b5;
  --on-error: #601410;

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-full: 999px;

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
  --shadow-md: 0 2px 8px rgba(0,0,0,0.4);
  --shadow-lg: 0 4px 16px rgba(0,0,0,0.5);

  --transition: 150ms ease;
  
  --sidebar-w: 280px;
  --sidebar-expanded-w: 100vw;

  color-scheme: dark;
}

/* ── Light Theme ─────────────────────────────────────── */
body.light {
  --surface: #fdfbff;
  --surface-variant: #f0eff4;
  --surface-container: #f5f3f7;
  --on-surface: #1a1c1e;
  --on-surface-variant: #44474e;

  --primary: #1a6db5;
  --on-primary: #ffffff;
  --primary-container: #d1e4ff;
  --on-primary-container: #001d36;

  --secondary: #525f70;
  --on-secondary: #ffffff;
  --secondary-container: #d8e3f8;
  --on-secondary-container: #121c29;

  --outline: #74777f;
  --outline-variant: #c4c6cf;

  --error: #ba1a1a;
  --on-error: #ffffff;

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.08);
  --shadow-md: 0 2px 8px rgba(0,0,0,0.12);
  --shadow-lg: 0 4px 16px rgba(0,0,0,0.16);

  color-scheme: light;
}

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

html, body {
  height: 100%;
  overflow: hidden;
}

body {
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.5;
  color: var(--on-surface);
  background: var(--surface);
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}
.icon-btn:focus-visible,
.icon-btn-sm:focus-visible,
.text-btn:focus-visible,
.text-btn-sm:focus-visible,
.browser-item:focus-visible,
.repo-list-item:focus-visible,
.result-action-btn:focus-visible,
.random-book-btn:focus-visible,
.random-big-btn:focus-visible,
.filter-checkbox-item:focus-visible,
.back-to-global:focus-visible,
.sidebar-breadcrumb .crumb-item:focus-visible,
input:focus-visible,
select:focus-visible {
  outline: none;
}

a {
  color: var(--primary);
  text-decoration: none;
}
a:hover, a:focus-visible {
  text-decoration: underline;
}

button {
  font-family: inherit;
  font-size: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

input, select {
  font-family: inherit;
  font-size: inherit;
  color: var(--on-surface);
  background: none;
  border: none;
  outline: none;
}

ul, li {
  list-style: none;
}

/* ── Scrollbar ───────────────────────────────────────── */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: var(--outline-variant);
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--outline);
}

/* ═══════════════════════════════════════════════════════════
   Header
   ═══════════════════════════════════════════════════════════ */

#header {
  height: var(--header-h);
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 8px;
  background: var(--surface-container);
  border-bottom: 1px solid var(--outline-variant);
  z-index: 100;
  flex-shrink: 0;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-shrink: 0;
}

.header-logo {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--on-surface);
  font-weight: 600;
  font-size: 15px;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  transition: background var(--transition);
  text-decoration: none;
}
.header-logo:hover, .header-logo:focus-visible {
  background: var(--surface-variant);
  text-decoration: none;
}

.header-center {
  flex: 1;
  display: flex;
  justify-content: center;
  min-width: 0;
}

.search-box {
  position: relative;
  display: flex;
  align-items: center;
  width: 100%;
  max-width: 680px;
  height: 36px;
  background: var(--surface);
  border: 1px solid var(--outline-variant);
  border-radius: var(--radius-full);
  transition: all var(--transition);
}
.search-box:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--primary) 25%, transparent);
}

.search-icon {
  flex-shrink: 0;
  margin-left: 12px;
  color: var(--on-surface-variant);
}

.search-input {
  flex: 1;
  height: 100%;
  padding: 0 8px;
  font-size: 14px;
  background: transparent;
  min-width: 0;
}
.search-input::placeholder {
  color: var(--on-surface-variant);
  opacity: 0.6;
}

.search-kbd {
  flex-shrink: 0;
  margin-right: 8px;
  font-size: 10px;
  padding: 2px 6px;
  border-radius: 4px;
  border: 1px solid var(--outline-variant);
  color: var(--on-surface-variant);
  opacity: 0.7;
  font-family: var(--font-mono);
}

.header-right {
  display: flex;
  align-items: center;
  gap: 2px;
  flex-shrink: 0;
}

/* Icon Buttons */
.icon-btn {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  color: var(--on-surface-variant);
  transition: all var(--transition);
}
.icon-btn:hover, .icon-btn:focus-visible {
  background: var(--surface-variant);
  color: var(--on-surface);
}

.icon-btn-sm {
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  color: var(--on-surface-variant);
  font-size: 18px;
  transition: all var(--transition);
}
.icon-btn-sm:hover, .icon-btn-sm:focus-visible {
  background: var(--surface-variant);
  color: var(--on-surface);
}

.text-btn {
  font-size: 12px;
  color: var(--primary);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  transition: background var(--transition);
}
.text-btn:hover, .text-btn:focus-visible {
  background: var(--surface-variant);
}

.text-btn-sm {
  font-size: 11px;
  color: var(--primary);
  padding: 2px 6px;
  border-radius: 4px;
  transition: background var(--transition);
}
.text-btn-sm:hover, .text-btn-sm:focus-visible {
  background: var(--surface-variant);
}

/* ═══════════════════════════════════════════════════════════
   Layout
   ═══════════════════════════════════════════════════════════ */

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

/* ── Sidebar ─────────────────────────────────────────── */
.sidebar {
  width: var(--sidebar-w);
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--outline-variant);
  background: var(--surface-container);
  transition: width var(--transition), opacity var(--transition);
  overflow: hidden;
}
.sidebar.collapsed {
  width: 0 !important; 
  border-right: none;
}
.right-sidebar {
  border-right: none;
  border-left: 1px solid var(--outline-variant);
}
.right-sidebar.collapsed {
  border-left: none;
}

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px;
  font-size: 12px;
  height: 36px;
  min-height: 36px;
  font-weight: 600;
  color: var(--on-surface-variant);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border-bottom: 1px solid var(--outline-variant);
  flex-shrink: 0;
}

.sidebar-content {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 0;
}

.sidebar-loading {
  padding: 16px;
  text-align: center;
  font-size: 13px;
  color: var(--on-surface-variant);
  opacity: 0.7;
}
.sidebar.expanded-wide {
  width: var(--sidebar-expanded-w) !important;
}

/* ── Breadcrumb (Left Sidebar) ───────────────────────── */
.sidebar-breadcrumb {
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 6px 8px;
  border-bottom: 1px solid var(--outline-variant);
  flex-wrap: wrap;
  font-size: 12px;
  flex-shrink: 0;
  min-height: 32px;
}

.sidebar-breadcrumb .crumb-item {
  color: var(--primary);
  cursor: pointer;
  padding: 2px 4px;
  border-radius: 4px;
  white-space: nowrap;
  transition: background var(--transition);
}
.sidebar-breadcrumb .crumb-item:hover,
.sidebar-breadcrumb .crumb-item:focus-visible {
  background: var(--surface-variant);
}

.sidebar-breadcrumb .crumb-item.current {
  color: var(--on-surface-variant);
  cursor: default;
  font-weight: 500;
}
.sidebar-breadcrumb .crumb-item.current:hover,
.sidebar-breadcrumb .crumb-item.current:focus-visible {
  background: none;
}

.sidebar-breadcrumb .crumb-sep {
  color: var(--outline);
  flex-shrink: 0;
}

/* Back to global button */
.back-to-global {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  font-size: 13px;
  color: var(--primary);
  cursor: pointer;
  border-bottom: 1px solid var(--outline-variant);
  transition: background var(--transition);
  flex-shrink: 0;
}
.back-to-global:hover, .back-to-global:focus-visible {
  background: var(--surface-variant);
}

/* ── Sidebar Browser Items (Folder + File) ───────────── */
.browser-list {
  flex: 1;
  overflow-y: auto;
}

.browser-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  cursor: pointer;
  transition: background var(--transition);
  font-size: 13px;
  color: var(--on-surface);
}
.browser-item:hover, .browser-item:focus-visible {
  background: var(--surface-variant);
}

/* 默认：无条纹 */
.browser-item:nth-child(even) {
  background: transparent;
}

/* 展开后：显示条纹 */
.left-sidebar.expanded-wide .browser-item:nth-child(even) {
  background: rgba(255, 255, 255, 0.04);
}

body.light .left-sidebar.expanded-wide .browser-item:nth-child(even) {
  background: rgba(0, 0, 0, 0.04);
}

.left-sidebar.expanded-wide .browser-item:nth-child(even):hover,
.left-sidebar.expanded-wide .browser-item:nth-child(even):focus-visible {
  background: var(--surface-variant);
}

.browser-item .browser-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  color: var(--on-surface-variant);
}

.browser-item .browser-name {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.browser-item .browser-count {
  font-size: 10px;
  color: var(--on-surface-variant);
  flex-shrink: 0;
}

.browser-item .browser-size {
  font-size: 10px;
  color: var(--on-surface-variant);
  flex-shrink: 0;
  margin-right: 4px;
}

.browser-item .browser-action {
  font-size: 10px;
  padding: 2px 6px;
  border-radius: 4px;
  color: var(--primary);
  border: 1px solid var(--primary);
  flex-shrink: 0;
  transition: all var(--transition);
  white-space: nowrap;
}
.browser-item .browser-action:hover,
.browser-item .browser-action:focus-visible {
  background: var(--primary-container);
  color: var(--on-primary-container);
}

/* ── Main Content ────────────────────────────────────── */
.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  position: relative;
  overflow: hidden;
}

/* ═══════════════════════════════════════════════════════════
   Repo List (Left Sidebar — Global Mode)
   ═══════════════════════════════════════════════════════════ */

.repo-list-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  cursor: pointer;
  transition: background var(--transition);
}
.repo-list-item:hover, .repo-list-item:focus-visible {
  background: var(--surface-variant);
}
.repo-list-item.active {
  background: var(--secondary-container);
}

.repo-list-item .repo-icon {
  width: 18px;
  height: 18px;
  color: var(--on-surface-variant);
  flex-shrink: 0;
}

.repo-list-item .repo-name {
  flex: 1;
  font-size: 13px;
  font-weight: 500;
  color: var(--on-surface);
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.repo-list-item .repo-count {
  font-size: 11px;
  color: var(--on-surface-variant);
  flex-shrink: 0;
}

/* ═══════════════════════════════════════════════════════════
   Status Bar
   ═══════════════════════════════════════════════════════════ */

.status-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 16px;
  border-bottom: 1px solid var(--outline-variant);
  flex-shrink: 0;
  min-height: 36px;
  height: 36px;
}

.status-left {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 12px;
  color: var(--on-surface-variant);
}

.status-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

.sort-group {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 12px;
  color: var(--on-surface-variant);
}

.sort-select {
  font-size: 12px;
  padding: 2px 6px;
  border: 1px solid var(--outline-variant);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--on-surface);
  cursor: pointer;
}

.did-you-mean {
  font-size: 12px;
  color: var(--primary);
  cursor: pointer;
}
.did-you-mean:hover, .did-you-mean:focus-visible {
  text-decoration: underline;
}

/* ═══════════════════════════════════════════════════════════
   Results
   ═══════════════════════════════════════════════════════════ */

.results-container {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
}

/* ── Result Item ─────────────────────────────────────── */
.result-item {
  display: flex;
  gap: 10px;
  padding: 10px 16px;
  border-bottom: 1px solid var(--outline-variant);
  transition: background var(--transition);
}
.result-item:hover, .result-item:focus-visible {
  background: var(--secondary-container) !important;
}

.result-file-icon {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
  margin-top: 2px;
  color: var(--on-surface-variant);
  display: flex;
  align-items: center;
  justify-content: center;
}
.result-file-icon svg {
  width: 22px;
  height: 22px;
}

.result-info {
  flex: 1;
  min-width: 0;
}

.result-title {
  font-size: 14px;
  font-weight: 500;
  color: var(--on-surface);
  word-break: break-all;
  line-height: 1.4;
}

.result-title mark {
  background: var(--primary-container);
  color: var(--on-primary-container);
  border-radius: 2px;
  padding: 0 1px;
}

.result-path {
  font-size: 11px;
  color: var(--on-surface-variant);
  margin-top: 3px;
  font-family: var(--font-mono);
  word-break: break-all;
  display: flex;
  align-items: center;
  gap: 2px;
  flex-wrap: wrap;
  line-height: 1.5;
}

.result-path .path-sep {
  color: var(--outline);
  margin: 0 2px;
  user-select: none;
}

.result-path .path-folder {
  cursor: pointer;
  color: var(--secondary);
  transition: color var(--transition);
}
.result-path .path-folder:hover,
.result-path .path-folder:focus-visible {
  color: var(--primary);
  text-decoration: underline;
}

.result-preview {
  font-size: 12px;
  color: var(--on-surface-variant);
  margin-top: 4px;
  line-height: 1.5;
  max-height: 3em;
  overflow: hidden;
  font-family: var(--font-mono);
}

.result-preview mark {
  background: var(--primary-container);
  color: var(--on-primary-container);
  border-radius: 2px;
  padding: 0 1px;
}

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

.result-repo-tag {
  font-size: 10px;
  padding: 2px 8px;
  border-radius: 10px;
  background: var(--primary-container);
  color: var(--on-primary-container);
  cursor: pointer;
  font-weight: 500;
  transition: opacity var(--transition);
}
.result-repo-tag:hover, .result-repo-tag:focus-visible {
  opacity: 0.8;
}

.result-size {
  font-size: 11px;
  color: var(--on-surface-variant);
}

.result-actions {
  display: flex;
  gap: 4px;
  flex-shrink: 0;
  flex-wrap: wrap;
  align-items: flex-start;
}

.result-action-btn {
  font-size: 11px;
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  color: var(--on-surface-variant);
  border: 1px solid var(--outline-variant);
  white-space: nowrap;
  transition: all var(--transition);
}
.result-action-btn:hover, .result-action-btn:focus-visible {
  background: var(--surface-variant);
  border-color: var(--outline);
}
.result-action-btn.primary {
  color: var(--primary);
  border-color: var(--primary);
}
.result-action-btn.primary:hover,
.result-action-btn.primary:focus-visible {
  background: var(--primary-container);
  border-color: var(--primary);
  color: var(--on-primary-container);
}

/* ═══════════════════════════════════════════════════════════
   Load Info
   ═══════════════════════════════════════════════════════════ */

.load-info {
  text-align: center;
  padding: 12px;
  font-size: 12px;
  color: var(--on-surface-variant);
  border-top: 1px solid var(--outline-variant);
  flex-shrink: 0;
}

/* ═══════════════════════════════════════════════════════════
   Quick Scroll Track
   ═══════════════════════════════════════════════════════════ */

.scroll-track {
  position: absolute;
  right: 2px;
  top: 40px;
  bottom: 50px;
  width: 8px;
  opacity: 0;
  transition: opacity 0.3s;
  pointer-events: none;
}
.scroll-track.visible {
  opacity: 1;
  pointer-events: auto;
}
.scroll-thumb {
  position: absolute;
  width: 6px;
  left: 1px;
  border-radius: 3px;
  background: var(--outline);
  cursor: pointer;
  min-height: 30px;
  transition: background var(--transition);
}
.scroll-thumb:hover, .scroll-thumb:focus-visible {
  background: var(--on-surface-variant);
}

/* ═══════════════════════════════════════════════════════════
   Footer
   ═══════════════════════════════════════════════════════════ */

.footer {
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-top: 1px solid var(--outline-variant);
  padding: 0 16px;
  flex-shrink: 0;
  position: relative;
  background: var(--surface-container);
}

.hitokoto {
  font-size: 11px;
  color: var(--on-surface-variant);
  opacity: 0.55;
  text-align: center;
  max-width: 70%;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
  min-height: 18px;
}

.random-book-btn {
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 11px;
  color: var(--on-surface-variant);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--outline-variant);
  transition: all var(--transition);
}
.random-book-btn:hover, .random-book-btn:focus-visible {
  background: var(--surface-variant);
  border-color: var(--outline);
  color: var(--primary);
}

/* ═══════════════════════════════════════════════════════════
   Filter Section (Right Sidebar)
   ═══════════════════════════════════════════════════════════ */

.filter-section {
  border-bottom: 1px solid var(--outline-variant);
  padding: 10px 12px;
}

.filter-section-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12px;
  font-weight: 600;
  color: var(--on-surface-variant);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 8px;
}

.filter-actions {
  display: flex;
  gap: 4px;
}

.filter-checkbox-list {
  max-height: 240px;
  overflow-y: auto;
}

.filter-checkbox-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 0;
  font-size: 13px;
  color: var(--on-surface);
  cursor: pointer;
  transition: color var(--transition);
}
.filter-checkbox-item:hover, .filter-checkbox-item:focus-visible {
  color: var(--primary);
}

.filter-checkbox-item input[type="checkbox"] {
  accent-color: var(--primary);
  width: 16px;
  height: 16px;
  cursor: pointer;
}

.filter-checkbox-item .checkbox-count {
  font-size: 10px;
  color: var(--on-surface-variant);
  margin-left: auto;
}

/* ── Folder Tree Filter ──────────────────────────────── */
.filter-folder-tree {
  max-height: 280px;
  overflow-y: auto;
  overflow-x: auto;
  white-space: nowrap;
}

.filter-folder-item {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 3px 0 3px calc(var(--fdepth, 0) * 16px);
  font-size: 13px;
  color: var(--on-surface);
  cursor: pointer;
  white-space: nowrap;
  flex-wrap: nowrap;
}

.filter-folder-item .tree-toggle {
  width: 16px;
  height: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--on-surface-variant);
  font-size: 10px;
}
.filter-folder-item .tree-toggle.expanded {
  transform: rotate(90deg);
}

.filter-folder-item input[type="checkbox"] {
  accent-color: var(--primary);
  width: 14px;
  height: 14px;
  cursor: pointer;
  flex-shrink: 0;
}

/* ── Size Filter ─────────────────────────────────────── */
.filter-size-row {
  display: flex;
  align-items: center;
  gap: 6px;
}

.size-input {
  flex: 1;
  font-size: 12px;
  padding: 6px 8px;
  border: 1px solid var(--outline-variant);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--on-surface);
  min-width: 0;
}
.size-input:focus {
  border-color: var(--primary);
}

.size-sep {
  font-size: 12px;
  color: var(--on-surface-variant);
  flex-shrink: 0;
}

/* ═══════════════════════════════════════════════════════════
   Empty State
   ═══════════════════════════════════════════════════════════ */

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 64px 16px;
  text-align: center;
  gap: 12px;
}

.empty-icon {
  width: 56px;
  height: 56px;
  color: var(--outline-variant);
  opacity: 0.4;
}

.empty-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--on-surface-variant);
}

.empty-desc {
  font-size: 13px;
  color: var(--on-surface-variant);
  opacity: 0.6;
}

.random-big-btn {
  font-size: 14px;
  padding: 10px 24px;
  border-radius: 24px;
  background: var(--primary);
  color: var(--on-primary);
  font-weight: 500;
  cursor: pointer;
  transition: opacity var(--transition);
  display: flex;
  align-items: center;
  gap: 8px;
}
.random-big-btn:hover, .random-big-btn:focus-visible {
  opacity: 0.85;
}

/* ═══════════════════════════════════════════════════════════
   Progress Bar (Initial Load)
   ═══════════════════════════════════════════════════════════ */

.progress-container {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 9999;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 16px;
  height: 3px;
  background: var(--surface-variant);
  transition: height 0.3s ease, opacity 0.5s ease;
}
.progress-container.progress-done {
  opacity: 0;
  pointer-events: none;
  height: 0;
  padding: 0;
}
.progress-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--primary), #6dd5ed);
  border-radius: 0 2px 2px 0;
  transition: width 0.3s ease;
  min-width: 0;
}
.progress-text {
  font-size: 12px;
  font-family: var(--font-sans);
  color: var(--on-surface-variant);
  white-space: nowrap;
  flex-shrink: 0;
  opacity: 0;
  transition: opacity 0.2s ease;
}
.progress-container:hover, .progress-container:focus-visible {
  height: 28px;
  padding: 0 16px;
}
.progress-container:hover .progress-text,
.progress-container:focus-visible .progress-text {
  opacity: 1;
}
.progress-container:hover .progress-bar,
.progress-container:focus-visible .progress-bar {
  border-radius: var(--radius-sm);
}
.progress-container.progress-done:hover,
.progress-container.progress-done:focus-visible {
  height: 0;
  padding: 0;
}

/* ═══════════════════════════════════════════════════════════
   Loading Spinner
   ═══════════════════════════════════════════════════════════ */

.loading-spinner {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.spinner {
  width: 28px;
  height: 28px;
  border: 3px solid var(--outline-variant);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

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

/* ═══════════════════════════════════════════════════════════
   Overlay
   ═══════════════════════════════════════════════════════════ */

.overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 90;
}

/* ═══════════════════════════════════════════════════════════
   Toast
   ═══════════════════════════════════════════════════════════ */

.toast {
  position: fixed;
  bottom: 60px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--secondary-container);
  color: var(--on-secondary-container);
  padding: 8px 20px;
  border-radius: var(--radius-full);
  font-size: 13px;
  z-index: 200;
  box-shadow: var(--shadow-md);
  animation: toast-in 0.2s ease;
}

@keyframes toast-in {
  from {
    opacity: 0;
    transform: translateX(-50%) translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
  }
}

/* ═══════════════════════════════════════════════════════════
   Mobile
   ═══════════════════════════════════════════════════════════ */

body.mobile .sidebar:not(.open) {
  width: 0;
  border-right: none;
  border-left: none;
}

body.mobile .left-sidebar.open {
  position: fixed;
  top: var(--header-h);
  left: 0;
  bottom: 0;
  z-index: 95;
  width: 85vw;
  max-width: 320px;
  box-shadow: var(--shadow-lg);
}

body.mobile .right-sidebar.open {
  position: fixed;
  top: var(--header-h);
  right: 0;
  bottom: 0;
  z-index: 95;
  width: 85vw;
  max-width: 320px;
  box-shadow: var(--shadow-lg);
}

body.mobile .footer {
  display: none;
}

body.mobile .header-logo {
  display: none;
}

body.mobile .random-book-btn {
  position: fixed;
  bottom: 20px;
  right: 20px;
  z-index: 50;
  transform: none;
  background: var(--surface-container);
  box-shadow: var(--shadow-md);
  border-radius: var(--radius-full);
}

body.mobile .hitokoto {
  display: none;
}

body.mobile .search-kbd {
  display: none;
}

body.mobile .status-bar {
  padding: 4px 8px;
}

body.mobile .result-actions {
  flex-direction: column;
  align-items: flex-end;
}

/* ═══════════════════════════════════════════════════════════
   Responsive (auto-detect)
   ═══════════════════════════════════════════════════════════ */

@media (max-width: 768px) {
  body:not(.force-desktop) .sidebar:not(.open) {
    width: 0;
    border-right: none;
    border-left: none;
  }

  body:not(.force-desktop) .left-sidebar.open {
    position: fixed;
    top: var(--header-h);
    left: 0;
    bottom: 0;
    z-index: 95;
    width: 85vw;
    max-width: 320px;
    box-shadow: var(--shadow-lg);
  }

  body:not(.force-desktop) .right-sidebar.open {
    position: fixed;
    top: var(--header-h);
    right: 0;
    bottom: 0;
    z-index: 95;
    width: 85vw;
    max-width: 320px;
    box-shadow: var(--shadow-lg);
  }

  body:not(.force-desktop) .footer {
    display: none;
  }

  body:not(.force-desktop) .random-book-btn {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 50;
    transform: none;
    background: var(--surface-container);
    box-shadow: var(--shadow-md);
    border-radius: var(--radius-full);
  }

  body:not(.force-desktop) .hitokoto {
    display: none;
  }

  body:not(.force-desktop) .search-kbd {
    display: none;
  }
}

/* ═══════════════════════════════════════════════════════════
   Utility
   ═══════════════════════════════════════════════════════════ */

.hidden {
  display: none !important;
}

.truncate {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* ── Toggle Switch ──────────────────────────────────── */
.toggle-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
}

.toggle-label {
  font-size: 13px;
  color: var(--on-surface);
}

.toggle-row input[type="checkbox"] {
  display: none;
}

.toggle-switch {
  position: relative;
  width: 40px;
  height: 22px;
  background: var(--outline-variant);
  border-radius: 11px;
  transition: background var(--transition);
  flex-shrink: 0;
}

.toggle-switch::after {
  content: "";
  position: absolute;
  top: 2px;
  left: 2px;
  width: 18px;
  height: 18px;
  background: var(--surface);
  border-radius: 50%;
  transition: transform var(--transition);
}

.toggle-row input:checked + .toggle-switch {
  background: var(--primary);
}

.toggle-row input:checked + .toggle-switch::after {
  transform: translateX(18px);
}

input[type="checkbox"]:indeterminate {
  accent-color: var(--primary);
}
body.theme-transitioning *,
body.theme-transitioning *::before,
body.theme-transitioning *::after {
  transition: background-color 0.4s ease, color 0.4s ease, border-color 0.4s ease, box-shadow 0.4s ease !important;
}

.theme-ripple {
  position: fixed;
  border-radius: 50%;
  pointer-events: none;
  z-index: 9999;
  width: 0;
  height: 0;
  animation: theme-ripple-expand 0.6s ease-out forwards;
}

@keyframes theme-ripple-expand {
  0%   { width: 0; height: 0; opacity: 0.6; }
  100% { width: 300vmax; height: 300vmax; opacity: 0; transform: translate(-150vmax, -150vmax); }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}