/* ========================================
   Neiki's Markdown Editor — style.css
   ======================================== */

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

:root {
  --header-height: 50px;
  --toolbar-height: 42px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;

  /* Light theme (default) */
  --bg-primary: #ffffff;
  --bg-secondary: #f6f8fa;
  --bg-header: #24292f;
  --bg-toolbar: #f0f2f5;
  --bg-editor: #ffffff;
  --bg-preview: #ffffff;
  --bg-divider: #d0d7de;
  --bg-divider-hover: #0969da;
  --text-primary: #1f2328;
  --text-secondary: #656d76;
  --text-header: #ffffff;
  --border-color: #d0d7de;
  --btn-hover: #e2e5e9;
  --shadow: 0 1px 3px rgba(0,0,0,0.12);
}

[data-color-mode="dark"] {
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-header: #161b22;
  --bg-toolbar: #1c2128;
  --bg-editor: #0d1117;
  --bg-preview: #0d1117;
  --bg-divider: #30363d;
  --bg-divider-hover: #58a6ff;
  --text-primary: #e6edf3;
  --text-secondary: #8b949e;
  --text-header: #e6edf3;
  --border-color: #30363d;
  --btn-hover: #30363d;
  --shadow: 0 1px 3px rgba(0,0,0,0.3);
}

html, body {
  height: 100%;
  overflow: hidden;
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  transition: background 0.2s, color 0.2s;
}

/* ---------- Header ---------- */
#app-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  background: var(--bg-header);
  color: var(--text-header);
  box-shadow: var(--shadow);
}

.header-left {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo-icon {
  color: #58a6ff;
  flex-shrink: 0;
}

.logo-img {
  display: block;
}

.app-title {
  font-size: 1.4rem;
  font-weight: 700;
  white-space: nowrap;
  color: #58A6FF;
  font-family: "JetBrains Mono", monospace;
  transform: translateY(2px);
}

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

.header-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: 6px;
  background: transparent;
  color: var(--text-header);
  font-size: 13px;
  font-family: var(--font-sans);
  cursor: pointer;
  text-decoration: none;
  transition: background 0.15s;
  white-space: nowrap;
}

.header-btn:hover {
  background: rgba(255,255,255,0.1);
}

.header-btn.icon-only {
  padding: 5px 8px;
}

.header-btn svg {
  flex-shrink: 0;
}

/* Theme toggle icon visibility */
[data-color-mode="light"] .icon-sun { display: none; }
[data-color-mode="dark"] .icon-moon { display: none; }

.github-btn {
  background: rgba(255,255,255,0.08);
}

/* ---------- Toolbar ---------- */
#toolbar {
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  z-index: 99;
  height: var(--toolbar-height);
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 0 12px;
  background: var(--bg-toolbar);
  border-bottom: 1px solid var(--border-color);
  overflow-x: auto;
  overflow-y: hidden;
  transition: background 0.2s, border-color 0.2s;
}

#toolbar::-webkit-scrollbar {
  height: 4px;
}

#toolbar::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 2px;
}

#toolbar button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 32px;
  height: 30px;
  padding: 0 8px;
  border: none;
  border-radius: 4px;
  background: transparent;
  color: var(--text-primary);
  font-size: 13px;
  font-family: var(--font-sans);
  cursor: pointer;
  transition: background 0.15s;
  flex-shrink: 0;
}

#toolbar button:hover {
  background: var(--btn-hover);
}

#toolbar button svg {
  flex-shrink: 0;
}

.toolbar-sep {
  width: 1px;
  height: 20px;
  background: var(--border-color);
  margin: 0 4px;
  flex-shrink: 0;
}

/* ---------- Mobile Tab Switcher ---------- */
#mobile-tabs {
  display: none;
  position: fixed;
  top: calc(var(--header-height) + var(--toolbar-height));
  left: 0;
  right: 0;
  z-index: 98;
  height: 38px;
  background: var(--bg-toolbar);
  border-bottom: 1px solid var(--border-color);
}

#mobile-tabs .mobile-tab {
  flex: 1;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 600;
  font-family: var(--font-sans);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: color 0.15s, border-color 0.15s;
}

#mobile-tabs .mobile-tab.active {
  color: var(--text-primary);
  border-bottom-color: #0969da;
}

[data-color-mode="dark"] #mobile-tabs .mobile-tab.active {
  border-bottom-color: #58a6ff;
}

/* ---------- Split Container ---------- */
#split-container {
  position: fixed;
  top: calc(var(--header-height) + var(--toolbar-height));
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  overflow: hidden;
}

.pane {
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

#editor-pane {
  flex: 1 1 50%;
  min-width: 0;
  overflow: hidden;
}

#preview-pane {
  flex: 1 1 50%;
  min-width: 0;
  overflow-y: auto;
  background: var(--bg-preview);
  transition: background 0.2s;
}

/* ---------- Editor ---------- */
#editor {
  width: 100%;
  height: 100%;
  padding: 20px;
  border: none;
  outline: none;
  resize: none;
  background: var(--bg-editor);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.6;
  tab-size: 4;
  -moz-tab-size: 4;
  transition: background 0.2s, color 0.2s;
}

#editor::placeholder {
  color: var(--text-secondary);
}

/* ---------- Preview ---------- */
#preview {
  padding: 24px 32px;
  min-height: 100%;
}

#preview.markdown-body {
  font-size: 16px;
  line-height: 1.6;
}

/* Override github-markdown-css background */
[data-color-mode="light"] #preview.markdown-body {
  background-color: #ffffff;
  color: #1f2328;
}

[data-color-mode="dark"] #preview.markdown-body {
  background-color: #0d1117;
  color: #e6edf3;
}

/* Task list styling */
#preview .task-list-item {
  list-style: none;
}

#preview .task-list-item input[type="checkbox"] {
  margin-right: 6px;
}

/* ---------- Divider ---------- */
#divider {
  width: 8px;
  cursor: col-resize;
  background: var(--bg-secondary);
  border-left: 1px solid var(--border-color);
  border-right: 1px solid var(--border-color);
  flex-shrink: 0;
  transition: background 0.2s, border-color 0.2s;
  position: relative;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Grab handle dots */
#divider::before {
  content: '';
  width: 4px;
  height: 28px;
  border-radius: 2px;
  background: var(--border-color);
  transition: background 0.2s, height 0.2s;
}

#divider:hover,
#divider.dragging {
  background: var(--btn-hover);
}

#divider:hover::before,
#divider.dragging::before {
  background: var(--bg-divider-hover);
  height: 36px;
}

/* ---------- Responsive (≤ 960px) ---------- */
@media (max-width: 960px) {
  .header-btn span {
    display: none;
  }

  .header-btn {
    padding: 5px 8px;
    gap: 0;
  }

  .header-right {
    gap: 6px;
  }
}

/* ---------- Responsive (≤ 768px) ---------- */
@media (max-width: 768px) {
  #app-header {
    padding: 0 10px;
    height: 46px;
  }

  :root {
    --header-height: 46px;
  }

  .header-left {
    gap: 8px;
    min-width: 0;
  }

  .logo-icon {
    width: 22px;
    height: 22px;
  }

  .app-title {
    font-size: 1.0rem;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .header-right {
    gap: 4px;
  }

  .header-btn {
    padding: 4px 6px;
    border-radius: 5px;
  }

  .header-btn.icon-only {
    padding: 4px 5px;
  }

  .header-btn svg {
    width: 16px;
    height: 16px;
  }

  #mobile-tabs {
    display: flex;
  }

  #split-container {
    top: calc(var(--header-height) + var(--toolbar-height) + 38px);
    flex-direction: column;
  }

  #divider {
    display: none;
  }

  #editor-pane,
  #preview-pane {
    flex: none;
    width: 100% !important;
    height: 100%;
  }

  /* Hide/show panes based on active tab */
  #split-container.show-editor #editor-pane {
    display: flex;
  }
  #split-container.show-editor #preview-pane {
    display: none;
  }
  #split-container.show-preview #editor-pane {
    display: none;
  }
  #split-container.show-preview #preview-pane {
    display: flex;
  }

  #preview {
    padding: 16px;
  }
}

/* ---------- Responsive (≤ 480px) ---------- */
@media (max-width: 480px) {
  #app-header {
    padding: 0 8px;
    height: 42px;
  }

  :root {
    --header-height: 42px;
  }

  .app-title {
    font-size: 0.8rem;
  }

  .logo-icon {
    width: 20px;
    height: 20px;
  }

  .header-right {
    gap: 3px;
  }

  .header-btn {
    padding: 3px 5px;
    border-radius: 4px;
    border-width: 0;
    background: rgba(255,255,255,0.06);
  }

  .header-btn svg {
    width: 15px;
    height: 15px;
  }

  /* Hide GitHub button text + border on very small screens */
  .github-btn span {
    display: none;
  }

  #toolbar {
    padding: 0 8px;
    gap: 1px;
  }

  #toolbar button {
    min-width: 28px;
    height: 28px;
    padding: 0 5px;
  }
}

/* ---------- Selection & Scrollbar ---------- */
#editor::selection {
  background: rgba(9, 105, 218, 0.3);
}

[data-color-mode="dark"] #editor::selection {
  background: rgba(88, 166, 255, 0.3);
}

/* Shared scrollbar style for both panes */
#preview-pane::-webkit-scrollbar,
#editor-pane::-webkit-scrollbar,
#editor::-webkit-scrollbar {
  width: 8px;
}

#preview-pane::-webkit-scrollbar-track,
#editor-pane::-webkit-scrollbar-track,
#editor::-webkit-scrollbar-track {
  background: transparent;
}

#preview-pane::-webkit-scrollbar-thumb,
#editor-pane::-webkit-scrollbar-thumb,
#editor::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 4px;
  border: 2px solid transparent;
  background-clip: padding-box;
}

#preview-pane::-webkit-scrollbar-thumb:hover,
#editor-pane::-webkit-scrollbar-thumb:hover,
#editor::-webkit-scrollbar-thumb:hover {
  background: var(--text-secondary);
  border: 2px solid transparent;
  background-clip: padding-box;
}

/* Firefox scrollbar */
#preview-pane,
#editor-pane,
#editor {
  scrollbar-width: thin;
  scrollbar-color: var(--border-color) transparent;
}

/* ---------- Utility ---------- */
.no-select {
  user-select: none;
  -webkit-user-select: none;
}

/* Code block overflow in preview */
#preview pre {
  overflow-x: auto;
}

#preview pre code {
  font-family: var(--font-mono);
  font-size: 13.6px;
}

/* Ensure images don't overflow */
#preview img {
  max-width: 100%;
}