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

/* ── Theme variables ───────────────────────────────── */
:root {
  --bg-page:     #0d0d0d;
  --bg-text:     #141414;
  --bg-code:     #1e1e1e;
  --fg:          #e0e0e0;
  --border-code: #4ec94e;
  --palette-bg:  #1a1a1a;
  --palette-border: #444;
  --status-bg:   #111;
  --status-border: #2a2a2a;
  --status-fg:   #888;
  --cursor-color: #00ff00;

  --font-size:    14px;
  --line-height:  1.6;
  --status-height: 30px;
}

:root[data-theme="github-dark"] {
  --bg-page:     #0d1117;
  --bg-text:     #161b22;
  --bg-code:     #21262d;
  --fg:          #c9d1d9;
  --border-code: #58a6ff;
  --palette-bg:  #161b22;
  --palette-border: #30363d;
  --status-bg:   #010409;
  --status-border: #21262d;
  --status-fg:   #8b949e;
  --cursor-color: #58a6ff;
}

:root[data-theme="nord"] {
  --bg-page:     #2e3440;
  --bg-text:     #3b4252;
  --bg-code:     #434c5e;
  --fg:          #eceff4;
  --border-code: #88c0d0;
  --palette-bg:  #3b4252;
  --palette-border: #4c566a;
  --status-bg:   #2e3440;
  --status-border: #3b4252;
  --status-fg:   #a0aab8;
  --cursor-color: #88c0d0;
}

:root[data-theme="solarized-light"] {
  --bg-page:     #fdf6e3;
  --bg-text:     #eee8d5;
  --bg-code:     #ddd8c7;
  --fg:          #657b83;
  --border-code: #268bd2;
  --palette-bg:  #eee8d5;
  --palette-border: #ccc4b0;
  --status-bg:   #e5dfd0;
  --status-border: #cdc8b8;
  --status-fg:   #93a1a1;
  --cursor-color: #268bd2;
}

:root[data-theme="dracula"] {
  --bg-page:     #1e1e2e;
  --bg-text:     #282a36;
  --bg-code:     #21222c;
  --fg:          #f8f8f2;
  --border-code: #bd93f9;
  --palette-bg:  #282a36;
  --palette-border: #44475a;
  --status-bg:   #191a21;
  --status-border: #44475a;
  --status-fg:   #6272a4;
  --cursor-color: #f1fa8c;
}

:root[data-theme="one-dark"] {
  --bg-page:     #1e2127;
  --bg-text:     #21252b;
  --bg-code:     #282c34;
  --fg:          #abb2bf;
  --border-code: #61afef;
  --palette-bg:  #21252b;
  --palette-border: #3a3f4b;
  --status-bg:   #1a1d23;
  --status-border: #3a3f4b;
  --status-fg:   #5c6370;
  --cursor-color: #61afef;
}

:root[data-theme="tokyo-night"] {
  --bg-page:     #1a1b26;
  --bg-text:     #1f2335;
  --bg-code:     #24283b;
  --fg:          #c0caf5;
  --border-code: #7aa2f7;
  --palette-bg:  #1f2335;
  --palette-border: #3b4261;
  --status-bg:   #16161e;
  --status-border: #3b4261;
  --status-fg:   #565f89;
  --cursor-color: #7aa2f7;
}

/* ── Page layout ───────────────────────────────────── */
html, body {
  height: 100%;
  background: var(--bg-page);
  color: var(--fg);
}

body {
  display: flex;
  flex-direction: column;
  font-size: var(--font-size);
  line-height: var(--line-height);
}

/* ── Document container ────────────────────────────── */
#document-container {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  position: relative;
}

/* ── Block base ────────────────────────────────────── */
.block {
  width: 100%;
  position: relative;
}

/* ── Text block ────────────────────────────────────── */
.text-block .block-content {
  background: transparent;
  color: var(--fg);
  padding: 10px 14px;
  min-height: 2.4em;
  white-space: pre-wrap;
  word-wrap: break-word;
  outline: none;
  caret-color: var(--cursor-color);
  border: none;
}

.text-block .block-content:empty::before {
  content: 'let ideas flow...';
  color: var(--fg);
  opacity: 0.25;
  pointer-events: none;
}

/* ── Code block ────────────────────────────────────── */
.code-block {
  border-left: 3px solid var(--border-code);
}

.code-block-label {
  position: absolute;
  top: 6px;
  right: 10px;
  font-size: 10px;
  color: var(--border-code);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  pointer-events: none;
  z-index: 2;
}

/* Two-layer: highlight behind, contenteditable in front */
.code-block {
  position: relative;
}

.hljs-layer {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  padding: 10px 14px;
  margin: 0;
  font-size: var(--font-size);
  line-height: var(--line-height);
  white-space: pre-wrap;
  word-wrap: break-word;
  pointer-events: none;
  background: var(--bg-code);
  z-index: 0;
  overflow: hidden;
}

.hljs-layer code {
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
  background: transparent;
  padding: 0;
  white-space: pre-wrap;
  word-wrap: break-word;
}

.hljs { background: transparent; padding: 0; }

.code-block .block-content {
  position: relative;
  z-index: 1;
  background: transparent;
  color: transparent;
  caret-color: var(--cursor-color);
  padding: 10px 14px;
  min-height: 2.4em;
  white-space: pre-wrap;
  word-wrap: break-word;
  overflow-wrap: break-word;
  width: 100%;
  overflow-x: hidden;
  outline: none;
}

/* ── Status bar ────────────────────────────────────── */
#status {
  height: var(--status-height);
  background: var(--status-bg);
  border-top: 1px solid var(--status-border);
  display: flex;
  align-items: center;
  padding: 0 16px;
  gap: 16px;
  font-size: 12px;
  color: var(--status-fg);
  flex-shrink: 0;
  z-index: 10;
}

#status-lang, #status-font { color: #aaa; }
#status-lang::before { content: '['; }
#status-lang::after  { content: ']'; }
#status-font::before { content: '['; }
#status-font::after  { content: ']'; }

#status-url { margin-left: auto; }
#status-url.green  { color: #4ec94e; }
#status-url.yellow { color: #e5c07b; }
#status-url.red    { color: #e06c75; }

#status-hint { color: #555; font-size: 11px; }

#status-copied {
  color: #4ec94e;
  font-size: 11px;
  opacity: 0;
  transition: opacity 0.2s;
}
#status-copied.visible { opacity: 1; }

/* ── Command palette (bottom-left) ─────────────────── */
#palette-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
}
#palette-overlay.hidden { display: none; }

#palette {
  position: absolute;
  bottom: calc(var(--status-height) + 8px);
  left: 16px;
  background: var(--palette-bg);
  border: 1px solid var(--palette-border);
  min-width: 286px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.4);
}

#palette-search {
  display: block;
  width: 100%;
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--palette-border);
  padding: 6px 10px;
  color: var(--fg);
  font-family: inherit;
  font-size: 13px;
  outline: none;
  caret-color: var(--cursor-color);
}
#palette-search::placeholder { color: #555; }

#palette-title {
  padding: 4px 10px 2px;
  font-size: 10px;
  color: #555;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

#palette-list {
  list-style: none;
  padding: 2px 0;
}

#palette-list li {
  padding: 5px 10px;
  cursor: pointer;
  font-size: 13px;
  color: var(--fg);
}

#palette-list li { display: flex; justify-content: space-between; align-items: center; }
#palette-list li.active { background: rgba(255,255,255,0.08); color: #fff; }
#palette-list li:hover  { background: rgba(255,255,255,0.05); }
.palette-hint { color: #555; font-size: 11px; }