/* ═══════════════════════════════════════════════════
   HedgeDoc Markdown Editor & Viewer – Stylesheet
   ═══════════════════════════════════════════════════ */

/* ── Theme tokens ─────────────────────────────────── */
:root {
  color-scheme: light;
  font-family: "Inter", system-ui, sans-serif;

  --bg: #f0f2f5;
  --surface: #ffffff;
  --text: #1a1d23;
  --text-secondary: #6b7280;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-muted: rgba(37, 99, 235, 0.1);
  --border: #e5e7eb;
  --border-strong: #d1d5db;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.1);
  --radius: 12px;
  --radius-sm: 8px;
  --editor-bg: #ffffff;
  --editor-line-bg: #f8f9fa;
  --editor-line-text: #9ca3af;
  --preview-code-bg: #f1f5f9;
  --preview-code-block-bg: #0f172a;
  --preview-code-block-text: #e2e8f0;
  --preview-blockquote-bg: #f8fafc;
  --toolbar-bg: #ffffff;
  --drop-bg: rgba(37, 99, 235, 0.08);
  --toc-active: var(--primary);
  --scrollbar-thumb: #c1c7d0;
  --scrollbar-track: transparent;
  --gutter-color: #d1d5db;
  --gutter-hover: var(--primary);
}

[data-theme="dark"] {
  color-scheme: dark;

  --bg: #0f1117;
  --surface: #1a1d27;
  --text: #e2e8f0;
  --text-secondary: #8b95a5;
  --primary: #3b82f6;
  --primary-hover: #60a5fa;
  --primary-muted: rgba(59, 130, 246, 0.15);
  --border: #2a2e3a;
  --border-strong: #3a3f4d;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.4);
  --editor-bg: #1a1d27;
  --editor-line-bg: #151821;
  --editor-line-text: #4a5060;
  --preview-code-bg: #252a36;
  --preview-code-block-bg: #0d1117;
  --preview-code-block-text: #c9d1d9;
  --preview-blockquote-bg: #1e2230;
  --toolbar-bg: #1a1d27;
  --drop-bg: rgba(59, 130, 246, 0.1);
  --scrollbar-thumb: #3a3f4d;
  --scrollbar-track: transparent;
  --gutter-color: #3a3f4d;
  --gutter-hover: var(--primary);
}

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

html, body {
  height: 100%;
}

body {
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* Scrollbar styling */
::-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(--text-secondary);
}

/* ── App shell ────────────────────────────────────── */
.app {
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* ── Header ───────────────────────────────────────── */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 20px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  z-index: 10;
}

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

.brand h1 {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.3px;
}

.brand-tagline {
  color: var(--text-secondary);
  font-size: 12px;
  margin-top: 1px;
}

.brand-dot {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: linear-gradient(135deg, #3b82f6, #06b6d4, #10b981);
  flex-shrink: 0;
}

/* ── View toggles ─────────────────────────────────── */
.view-toggles {
  display: flex;
  background: var(--bg);
  border-radius: var(--radius-sm);
  padding: 3px;
  gap: 2px;
}

.view-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border: none;
  border-radius: 6px;
  background: transparent;
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.15s ease;
}

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

.view-btn.active {
  background: var(--surface);
  color: var(--text);
  box-shadow: var(--shadow-sm);
}

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

/* ── Header actions ───────────────────────────────── */
.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.icon-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--text-secondary);
  cursor: pointer;
  font-family: inherit;
  transition: all 0.15s ease;
}

.icon-btn:hover {
  color: var(--text);
  border-color: var(--border-strong);
}

.icon-btn-sm {
  width: 28px;
  height: 28px;
  font-size: 18px;
  line-height: 1;
}

/* ── Buttons ──────────────────────────────────────── */
button {
  border: none;
  cursor: pointer;
  font-family: inherit;
}

.primary {
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  background: var(--primary);
  color: #fff;
  font-weight: 600;
  font-size: 13px;
  transition: background 0.15s ease;
}

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

.link-btn {
  background: none;
  border: none;
  color: var(--primary);
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  padding: 0;
  font-family: inherit;
}

.link-btn:hover {
  text-decoration: underline;
}

/* ── Toolbar ──────────────────────────────────────── */
.toolbar {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 6px 20px;
  background: var(--toolbar-bg);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  overflow-x: auto;
}

.toolbar-group {
  display: flex;
  gap: 2px;
}

.toolbar-sep {
  width: 1px;
  height: 20px;
  background: var(--border);
  margin: 0 6px;
  flex-shrink: 0;
}

.tool-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 32px;
  height: 30px;
  padding: 0 8px;
  border: none;
  border-radius: 6px;
  background: transparent;
  color: var(--text-secondary);
  font-size: 13px;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.12s ease;
  white-space: nowrap;
}

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

/* ── Workspace ────────────────────────────────────── */
.workspace {
  flex: 1;
  display: flex;
  overflow: hidden;
  position: relative;
  min-height: 0;
}

/* ── Table of Contents sidebar ────────────────────── */
.toc-sidebar {
  display: none;
  width: 240px;
  flex-shrink: 0;
  background: var(--surface);
  border-right: 1px solid var(--border);
  overflow-y: auto;
}

.toc-sidebar.open {
  display: flex;
  flex-direction: column;
}

.toc-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
}

.toc-header h3 {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.toc-list {
  padding: 8px 0;
  overflow-y: auto;
}

.toc-list a {
  display: block;
  padding: 5px 16px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 13px;
  line-height: 1.4;
  border-left: 2px solid transparent;
  transition: all 0.12s ease;
}

.toc-list a:hover {
  color: var(--text);
  background: var(--primary-muted);
}

.toc-list a.active {
  color: var(--toc-active);
  border-left-color: var(--toc-active);
  font-weight: 500;
}

.toc-list a[data-level="2"] { padding-left: 28px; }
.toc-list a[data-level="3"] { padding-left: 40px; }
.toc-list a[data-level="4"] { padding-left: 52px; }

/* ── Editor pane ──────────────────────────────────── */
.editor-pane {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  overflow: hidden;
  background: var(--editor-bg);
}

.pane-label {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  font-size: 11px;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.pane-label-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.editor-dot {
  background: #f59e0b;
}

.preview-dot {
  background: #10b981;
}

.editor-wrap {
  flex: 1;
  display: flex;
  overflow: hidden;
  position: relative;
}

.line-numbers {
  width: 48px;
  flex-shrink: 0;
  padding: 16px 8px 16px 0;
  background: var(--editor-line-bg);
  color: var(--editor-line-text);
  font-family: "JetBrains Mono", "Fira Code", "Cascadia Code", monospace;
  font-size: 14px;
  line-height: 1.65;
  text-align: right;
  overflow: hidden;
  user-select: none;
  border-right: 1px solid var(--border);
}

.line-numbers span {
  display: block;
}

#markdown-input {
  flex: 1;
  padding: 16px;
  border: none;
  outline: none;
  resize: none;
  font-size: 14px;
  line-height: 1.65;
  font-family: "JetBrains Mono", "Fira Code", "Cascadia Code", monospace;
  background: var(--editor-bg);
  color: var(--text);
  tab-size: 2;
  overflow-y: auto;
}

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

/* ── Gutter (resize handle) ───────────────────────── */
.gutter {
  width: 5px;
  flex-shrink: 0;
  background: var(--border);
  cursor: col-resize;
  position: relative;
  transition: background 0.15s ease;
}

.gutter:hover,
.gutter.dragging {
  background: var(--gutter-hover);
}

/* ── Preview pane ─────────────────────────────────── */
.preview-pane {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  overflow: hidden;
  background: var(--surface);
  border-left: none;
}

.preview-content {
  flex: 1;
  padding: 24px 32px;
  overflow-y: auto;
  line-height: 1.7;
  font-size: 15px;
}

/* ── Preview typography ───────────────────────────── */
.preview-content h1 {
  font-size: 2em;
  margin: 0.8em 0 0.4em;
  padding-bottom: 0.3em;
  border-bottom: 1px solid var(--border);
}

.preview-content h2 {
  font-size: 1.5em;
  margin: 1.2em 0 0.4em;
  padding-bottom: 0.25em;
  border-bottom: 1px solid var(--border);
}

.preview-content h3 {
  font-size: 1.25em;
  margin: 1em 0 0.4em;
}

.preview-content h4,
.preview-content h5,
.preview-content h6 {
  margin: 1em 0 0.4em;
}

.preview-content h1:first-child,
.preview-content h2:first-child,
.preview-content h3:first-child {
  margin-top: 0;
}

.preview-content p {
  margin: 0.6em 0;
}

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

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

.preview-content img {
  max-width: 100%;
  border-radius: var(--radius-sm);
  margin: 8px 0;
}

/* Code */
.preview-content code {
  background: var(--preview-code-bg);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: "JetBrains Mono", "Fira Code", monospace;
  font-size: 0.88em;
}

.preview-content pre {
  background: var(--preview-code-block-bg);
  color: var(--preview-code-block-text);
  padding: 16px;
  border-radius: var(--radius-sm);
  overflow-x: auto;
  margin: 12px 0;
  line-height: 1.5;
}

.preview-content pre code {
  background: none;
  padding: 0;
  border-radius: 0;
  font-size: 13px;
  color: inherit;
}

/* Blockquote */
.preview-content blockquote {
  border-left: 4px solid var(--primary);
  margin: 12px 0;
  padding: 8px 16px;
  color: var(--text-secondary);
  background: var(--preview-blockquote-bg);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.preview-content blockquote p {
  margin: 4px 0;
}

/* Lists */
.preview-content ul,
.preview-content ol {
  padding-left: 2em;
  margin: 8px 0;
}

.preview-content li {
  margin: 4px 0;
}

.preview-content li > ul,
.preview-content li > ol {
  margin: 2px 0;
}

/* Task lists */
.preview-content ul.contains-task-list {
  list-style: none;
  padding-left: 0;
}

.preview-content .task-list-item {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.preview-content .task-list-item input[type="checkbox"] {
  margin: 0;
  accent-color: var(--primary);
}

/* Tables */
.preview-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 12px 0;
  font-size: 14px;
}

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

.preview-content th {
  background: var(--primary-muted);
  font-weight: 600;
}

.preview-content tr:nth-child(even) {
  background: var(--preview-blockquote-bg);
}

/* Horizontal rule */
.preview-content hr {
  border: none;
  height: 2px;
  background: var(--border);
  margin: 24px 0;
  border-radius: 1px;
}

/* ── View modes ───────────────────────────────────── */
.workspace[data-view="edit"] .preview-pane,
.workspace[data-view="edit"] .gutter {
  display: none;
}

.workspace[data-view="preview"] .editor-pane,
.workspace[data-view="preview"] .gutter {
  display: none;
}

.workspace[data-view="edit"] .editor-pane,
.workspace[data-view="preview"] .preview-pane {
  flex: 1;
}

/* ── Status bar ───────────────────────────────────── */
.status-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 20px;
  background: var(--surface);
  border-top: 1px solid var(--border);
  font-size: 12px;
  color: var(--text-secondary);
  flex-shrink: 0;
  gap: 12px;
}

.status-left,
.status-center,
.status-right {
  display: flex;
  align-items: center;
  gap: 6px;
}

.status-sep {
  color: var(--border-strong);
}

kbd {
  background: var(--border);
  color: var(--text);
  padding: 1px 5px;
  border-radius: 4px;
  font-size: 11px;
  font-family: inherit;
}

#save-status {
  font-weight: 500;
}

#save-status.saved {
  color: #10b981;
}

/* ── Drop overlay ─────────────────────────────────── */
.drop-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 100;
  background: var(--drop-bg);
  backdrop-filter: blur(4px);
}

.drop-overlay.visible {
  display: flex;
  align-items: center;
  justify-content: center;
}

.drop-overlay-inner {
  padding: 40px 60px;
  border: 3px dashed var(--primary);
  border-radius: 20px;
  font-size: 20px;
  font-weight: 600;
  color: var(--primary);
  background: var(--surface);
  box-shadow: var(--shadow-lg);
}

/* ── Responsive ───────────────────────────────────── */
@media (max-width: 900px) {
  .app-header {
    flex-wrap: wrap;
    gap: 8px;
    padding: 10px 12px;
  }

  .brand-tagline {
    display: none;
  }

  .view-toggles {
    order: 3;
    width: 100%;
    justify-content: center;
  }

  .toolbar {
    padding: 6px 12px;
  }

  .workspace {
    flex-direction: column;
  }

  .gutter {
    display: none;
  }

  .workspace[data-view="split"] .editor-pane,
  .workspace[data-view="split"] .preview-pane {
    flex: 1;
    min-height: 200px;
  }

  .toc-sidebar {
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    z-index: 20;
    box-shadow: var(--shadow-lg);
  }

  .preview-content {
    padding: 16px;
  }

  .status-bar {
    flex-wrap: wrap;
    gap: 4px;
    padding: 6px 12px;
  }

  .status-right kbd {
    display: none;
  }
}

@media (max-width: 600px) {
  .header-actions .primary {
    display: none;
  }

  .status-center,
  .status-right kbd,
  .status-right .status-sep:nth-child(-n+4) {
    display: none;
  }
}

/* ── Print styles ─────────────────────────────────── */
@media print {
  .app-header,
  .toolbar,
  .status-bar,
  .editor-pane,
  .gutter,
  .toc-sidebar {
    display: none !important;
  }

  .workspace {
    display: block !important;
  }

  .preview-pane {
    display: block !important;
    overflow: visible !important;
  }

  .pane-label {
    display: none !important;
  }

  .preview-content {
    padding: 0 !important;
  }
}