/* ── Reset / base ───────────────────────────────────────────────────────────── */

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

:root {
  --header-height: 48px;
  --symbol-bar-height: 40px;
  --bg: #ffffff;
  --surface: #f5f5f5;
  --text: #212121;
  --accent: #1565c0;
  --accent-fg: #ffffff;
  --accent-feedback: #2e7d32;
  --border: #e0e0e0;
  --btn-radius: 6px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1e1e1e;
    --surface: #2a2a2a;
    --text: #e0e0e0;
    --accent: #61afef;
    --accent-fg: #1e1e1e;
    --accent-feedback: #98c379;
    --border: #3a3a3a;
  }
}

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: ui-monospace, 'Cascadia Code', Menlo, monospace;
}

/* ── Layout ─────────────────────────────────────────────────────────────────── */

body {
  display: flex;
  flex-direction: column;
  height: 100dvh; /* dynamic viewport height: shrinks when keyboard opens */
}

/* Fallback for browsers without dvh */
@supports not (height: 100dvh) {
  body { height: 100vh; }
}

/* ── Header ─────────────────────────────────────────────────────────────────── */

.header {
  flex: 0 0 var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 12px;
  padding-left: max(12px, env(safe-area-inset-left));
  padding-right: max(12px, env(safe-area-inset-right));
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}

.app-title {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--text);
  user-select: none;
}

.header-actions {
  display: flex;
  gap: 8px;
}

/* ── Buttons ────────────────────────────────────────────────────────────────── */

.action-btn {
  min-width: 44px;
  min-height: 44px;
  padding: 0 14px;
  background: var(--accent);
  color: var(--accent-fg);
  border: none;
  border-radius: var(--btn-radius);
  font-family: inherit;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.1s;
  -webkit-tap-highlight-color: transparent;
}

.action-btn:active {
  opacity: 0.75;
}

.action-btn.feedback {
  background: var(--accent-feedback);
}

/* ── Editor container ───────────────────────────────────────────────────────── */

.editor-container {
  flex: 1 1 auto;
  min-height: 0; /* prevents flex child from overflowing */
  overflow: hidden;
}

#editor {
  height: 100%;
}

/* Prevent iOS auto-zoom on focus (font must be >= 16px) */
.cm-editor,
.cm-content {
  font-size: 16px !important;
  font-family: ui-monospace, 'Cascadia Code', Menlo, monospace !important;
}

/* Let CodeMirror own its scrolling */
.cm-editor {
  height: 100%;
  background: var(--bg) !important;
}

.cm-scroller {
  overflow: auto;
}

/* ── Symbol accessory bar ───────────────────────────────────────────────────── */

#symbol-bar {
  display: none; /* shown by JS when keyboard is up */
  flex-direction: row;
  align-items: center;
  height: var(--symbol-bar-height);
  overflow-x: auto;
  overflow-y: hidden;
  -webkit-overflow-scrolling: touch;
  padding: 2px 6px;
  padding-left: max(6px, env(safe-area-inset-left));
  padding-right: max(6px, env(safe-area-inset-right));
  padding-bottom: max(2px, env(safe-area-inset-bottom));
  background: var(--surface);
  border-top: 1px solid var(--border);
  gap: 4px;
  /* Positioned fixed above keyboard by JS */
  left: 0;
  right: 0;
  z-index: 100;
  /* Prevent scroll bars on macOS */
  scrollbar-width: none;
}

#symbol-bar::-webkit-scrollbar {
  display: none;
}

.sym-btn {
  flex: 0 0 auto;
  width: 36px;
  height: 36px;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 5px;
  font-family: inherit;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  white-space: nowrap;
  transition: background 0.08s;
}

/* Wider buttons for multi-char labels */
.sym-btn:not(:where([data-short])) {
  width: auto;
  min-width: 36px;
  padding: 0 8px;
}

.sym-btn:active {
  background: var(--accent);
  color: var(--accent-fg);
}