:root {
  --color-bg: #ffffff;
  --color-bg-secondary: #f7f8fa;
  --color-bg-hover: #eef0f4;
  --color-border: #e2e5ea;
  --color-text: #1a1d23;
  --color-text-secondary: #5f6672;
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-danger: #dc2626;
  --color-danger-hover: #b91c1c;
  --color-success: #16a34a;
  --color-warning: #f59e0b;
  --color-lock: #f59e0b;
  --sidebar-width: 260px;
  --header-height: 56px;
  --radius: 6px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: "SF Mono", "Fira Code", monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  height: 100%;
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
}

/* --- Header --- */

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  display: flex;
  align-items: center;
  padding: 0 1rem;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  z-index: 100;
  gap: 1rem;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
}

.header-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
}

.header-center {
  flex: 1;
  max-width: 400px;
}

.header-right {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* --- Force Unlock Footer --- */

.force-unlock-footer {
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--color-border);
  text-align: right;
}

.btn-link-subtle {
  background: none;
  border: none;
  color: var(--color-text-secondary);
  font-size: 0.8rem;
  font-family: var(--font-sans);
  cursor: pointer;
  padding: 0.25rem 0.5rem;
}

.btn-link-subtle:hover {
  text-decoration: underline;
  color: var(--color-danger);
}

/* --- Search --- */

.search-box {
  position: relative;
}

.search-box input {
  width: 100%;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 0.9rem;
  background: var(--color-bg-secondary);
  transition: border-color 0.15s;
}

.search-box input:focus {
  outline: none;
  border-color: var(--color-primary);
  background: var(--color-bg);
}

/* --- Layout --- */

.layout {
  display: flex;
  margin-top: var(--header-height);
  min-height: calc(100vh - var(--header-height));
}

/* --- Sidebar --- */

.sidebar {
  position: fixed;
  top: var(--header-height);
  left: 0;
  bottom: 0;
  width: var(--sidebar-width);
  overflow-y: auto;
  padding: 1rem;
  background: var(--color-bg-secondary);
  border-right: 1px solid var(--color-border);
  transition: transform 0.2s;
  z-index: 50;
}

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

.sidebar-actions {
  margin-bottom: 1rem;
}

.sidebar-tree {}

.sidebar-section {
  margin-bottom: 0.5rem;
}

.sidebar-section-title {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.35rem 0.5rem;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-text-secondary);
  cursor: pointer;
  border-radius: var(--radius);
  user-select: none;
}

.sidebar-section-title:hover {
  background: var(--color-bg-hover);
}

.sidebar-section-link {
  color: inherit;
  text-decoration: none;
}

.sidebar-section-link:hover {
  text-decoration: underline;
}

.sidebar-section-title .arrow {
  transition: transform 0.15s;
  font-size: 0.7rem;
}

.sidebar-section.collapsed .arrow {
  transform: rotate(-90deg);
}

.sidebar-section.collapsed .sidebar-pages {
  display: none;
}

.sidebar-pages {
  padding-left: 0.5rem;
}

.sidebar-page {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.3rem 0.5rem;
  font-size: 0.88rem;
  color: var(--color-text);
  text-decoration: none;
  border-radius: var(--radius);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.sidebar-page:hover {
  background: var(--color-bg-hover);
}

.sidebar-page.active {
  background: var(--color-primary);
  color: white;
}

.sidebar-page .lock-indicator {
  color: var(--color-lock);
  font-size: 0.75rem;
  flex-shrink: 0;
}

.sidebar-locks {
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--color-border);
}

.sidebar-locks-title {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  margin-bottom: 0.5rem;
}

.sidebar-lock-item {
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  padding: 0.2rem 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* --- Main --- */

.main {
  margin-left: var(--sidebar-width);
  flex: 1;
  padding: 2rem;
  max-width: 900px;
  width: 100%;
}

.view { display: none; }
.view[hidden] { display: none; }
.view.active { display: block; }

/* --- Page View --- */

.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.page-actions {
  display: flex;
  gap: 0.5rem;
}

.breadcrumb {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
}

.breadcrumb a {
  color: var(--color-primary);
  text-decoration: none;
}

.breadcrumb a:hover {
  text-decoration: underline;
}

.lock-banner {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  background: #fef3cd;
  border: 1px solid #ffc107;
  border-radius: var(--radius);
  margin-bottom: 1rem;
  font-size: 0.9rem;
}

.lock-icon { font-size: 1.1rem; }

.page-meta {
  margin-bottom: 1.5rem;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.tag {
  display: inline-block;
  padding: 0.15rem 0.5rem;
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  font-size: 0.78rem;
  color: var(--color-text-secondary);
}

/* --- Page Content (rendered markdown) --- */

.page-content {
  line-height: 1.7;
}

.page-content h1 { font-size: 1.8rem; margin: 1.5rem 0 0.75rem; font-weight: 700; }
.page-content h2 { font-size: 1.4rem; margin: 1.3rem 0 0.6rem; font-weight: 600; }
.page-content h3 { font-size: 1.15rem; margin: 1rem 0 0.5rem; font-weight: 600; }
.page-content h4 { font-size: 1rem; margin: 0.75rem 0 0.4rem; font-weight: 600; }

.page-content p { margin-bottom: 0.75rem; }

.page-content ul, .page-content ol {
  margin: 0.5rem 0 0.75rem 1.5rem;
}

.page-content li { margin-bottom: 0.25rem; }

.page-content code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  padding: 0.15rem 0.35rem;
  background: var(--color-bg-secondary);
  border-radius: 3px;
}

.page-content pre {
  padding: 1rem;
  background: #1e293b;
  color: #e2e8f0;
  border-radius: var(--radius);
  overflow-x: auto;
  margin: 0.75rem 0;
}

.page-content pre code {
  padding: 0;
  background: none;
  font-size: 0.85rem;
}

.page-content blockquote {
  border-left: 3px solid var(--color-primary);
  padding: 0.5rem 1rem;
  margin: 0.75rem 0;
  color: var(--color-text-secondary);
  background: var(--color-bg-secondary);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.page-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 0.75rem 0;
}

.page-content th, .page-content td {
  padding: 0.5rem 0.75rem;
  text-align: left;
  border: 1px solid var(--color-border);
}

.page-content th {
  background: var(--color-bg-secondary);
  font-weight: 600;
}

.page-content a {
  color: var(--color-primary);
  text-decoration: none;
}

.page-content a:hover {
  text-decoration: underline;
}

.page-content img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius);
}

.page-content hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 1.5rem 0;
}

/* --- Edit View --- */

.edit-header {
  margin-bottom: 1rem;
}

.edit-meta {
  display: grid;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.edit-footer {
  display: flex;
  gap: 0.75rem;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--color-border);
}

#editor-container, #new-editor-container {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

/* --- History --- */

.history-list {}

.history-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--color-border);
}

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

.history-date {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  white-space: nowrap;
  min-width: 140px;
}

.history-meta {
  flex: 1;
}

.history-message {
  font-size: 0.9rem;
  font-weight: 500;
}

.history-author {
  font-size: 0.8rem;
  color: var(--color-text-secondary);
}

.history-sha {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-primary);
  cursor: pointer;
}

/* --- Search Results --- */

.search-results {}

.search-result {
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--color-border);
}

.search-result:last-child {
  border-bottom: none;
}

.search-result-title {
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.search-result-title a {
  color: var(--color-primary);
  text-decoration: none;
}

.search-result-title a:hover {
  text-decoration: underline;
}

.search-result-description {
  font-size: 0.88rem;
  color: var(--color-text-secondary);
  margin-bottom: 0.25rem;
}

.search-result-match {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  font-style: italic;
}

/* --- Forms --- */

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.form-group label {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-text-secondary);
}

.form-input {
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 0.9rem;
  font-family: var(--font-sans);
  transition: border-color 0.15s;
}

.form-input:focus {
  outline: none;
  border-color: var(--color-primary);
}

select.form-input {
  cursor: pointer;
}

.form-input-readonly {
  background: var(--color-bg-secondary);
  color: var(--color-text-secondary);
  cursor: default;
}

/* --- Buttons --- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem 1rem;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-size: 0.88rem;
  font-weight: 500;
  font-family: var(--font-sans);
  cursor: pointer;
  text-decoration: none;
  transition: background 0.15s, border-color 0.15s;
  white-space: nowrap;
}

.btn-sm { padding: 0.35rem 0.75rem; font-size: 0.82rem; }

.btn-primary {
  background: var(--color-primary);
  color: white;
}
.btn-primary:hover { background: var(--color-primary-hover); }

.btn-secondary {
  background: var(--color-bg);
  color: var(--color-text);
  border-color: var(--color-border);
}
.btn-secondary:hover { background: var(--color-bg-secondary); }

.btn-danger {
  background: var(--color-danger);
  color: white;
}
.btn-danger:hover { background: var(--color-danger-hover); }

.btn-icon {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 1.3rem;
  line-height: 1;
  padding: 0.25rem;
  border-radius: var(--radius);
  color: var(--color-text);
}

.btn-icon:hover {
  background: var(--color-bg-hover);
}

.btn:disabled,
.btn[disabled] {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

.btn-loading {
  position: relative;
  color: transparent !important;
  pointer-events: none;
}

.btn-loading::after {
  content: '';
  position: absolute;
  width: 14px;
  height: 14px;
  border: 2px solid currentColor;
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  left: 50%;
  top: 50%;
  margin-left: -7px;
  margin-top: -7px;
}

.btn-primary.btn-loading::after { border-color: rgba(255,255,255,0.4); border-top-color: white; }
.btn-secondary.btn-loading::after { border-color: var(--color-border); border-top-color: var(--color-text); }
.btn-danger.btn-loading::after { border-color: rgba(255,255,255,0.4); border-top-color: white; }

/* --- Modal --- */

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
}

.modal-overlay[hidden] { display: none; }

.modal {
  background: var(--color-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  padding: 1.5rem;
  max-width: 420px;
  width: 90%;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.modal-header h3 {
  font-size: 1.1rem;
}

.modal-body {
  margin-bottom: 0.75rem;
  font-size: 0.9rem;
  color: var(--color-text-secondary);
}

.modal-extra {
  margin-bottom: 1rem;
}

.modal-footer {
  display: flex;
  gap: 0.75rem;
  justify-content: flex-end;
}

/* --- Progress Overlay --- */

.progress-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.35);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 250;
}

.progress-overlay[hidden] { display: none; }

.progress-content {
  background: var(--color-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  padding: 2rem 2.5rem;
  text-align: center;
}

.progress-content .loading-spinner {
  margin: 0 auto 1rem;
}

.progress-content p {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
}

/* --- Toast --- */

.toast-container {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 300;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.toast {
  padding: 0.75rem 1rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  font-size: 0.88rem;
  animation: toast-in 0.2s ease;
  max-width: 320px;
}

.toast-success { background: #d1fae5; color: #065f46; border: 1px solid #6ee7b7; }
.toast-error { background: #fee2e2; color: #991b1b; border: 1px solid #fca5a5; }
.toast-info { background: #dbeafe; color: #1e40af; border: 1px solid #93c5fd; }

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

/* --- Section View --- */

.section-page-list {
  display: grid;
  gap: 0.75rem;
  margin: 1.5rem 0;
}

.section-page-card {
  display: block;
  padding: 1rem 1.25rem;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  text-decoration: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.section-page-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

.section-page-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 0.25rem;
}

.section-page-desc {
  font-size: 0.88rem;
  color: var(--color-text-secondary);
}

.section-footer {
  margin-top: 1rem;
}

.section-index-actions {
  margin: 1rem 0;
}

/* --- Loading --- */

.loading-spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  margin: 3rem auto;
}

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

/* --- EasyMDE fullscreen / side-by-side z-index overrides --- */

.editor-toolbar.fullscreen {
  z-index: 110;
}

.EasyMDEContainer .CodeMirror-fullscreen {
  z-index: 109;
}

.EasyMDEContainer .editor-preview-side.editor-preview-active-side {
  z-index: 109;
}

/* --- Responsive --- */

@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .main {
    margin-left: 0;
    padding: 1rem;
  }

  .header-center {
    display: none;
  }

  .page-header {
    flex-direction: column;
    align-items: flex-start;
  }
}