/* ── Tool Section — ABOVE THE FOLD ─────────────────────────── */
.tool-section {
  /* No top padding — editor sits flush under the header */
  padding-top: var(--space-4);
  padding-bottom: var(--space-6);
}

.tool-container {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: var(--space-5);
  align-items: start;
}

/* ── Editor Panel ───────────────────────────────────────────── */
.editor-panel {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.editor-panel:focus-within {
  border-color: rgba(59, 76, 202, 0.35);
  box-shadow: 0 0 0 3px var(--color-primary-glow), var(--shadow-md);
}

/* ── Toolbar ────────────────────────────────────────────────── */
.editor-toolbar {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: 8px 14px;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg);
  flex-wrap: nowrap;
  min-height: 42px;
  overflow-x: auto;
  scrollbar-width: none;
}

.editor-toolbar::-webkit-scrollbar { display: none; }

.toolbar-btn,
.file-upload-label {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 5px 10px;
  border-radius: var(--radius-sm);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-muted);
  background: transparent;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition);
  font-family: var(--font-body);
  height: 30px;
  white-space: nowrap;
  flex-shrink: 0;
}

.toolbar-btn:hover,
.file-upload-label:hover {
  color: var(--color-primary);
  background: var(--color-primary-light);
  border-color: rgba(59, 76, 202, 0.2);
}

.toolbar-btn:active,
.file-upload-label:active {
  transform: scale(0.95);
}

.toolbar-divider {
  width: 1px;
  height: 18px;
  background: var(--color-border);
  flex-shrink: 0;
  margin: 0 2px;
}

.toolbar-spacer { flex: 1; }

.autosave-indicator {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.6875rem;
  font-weight: 500;
  color: var(--color-secondary);
  opacity: 0;
  transition: opacity 0.4s ease;
  white-space: nowrap;
  flex-shrink: 0;
}

.autosave-indicator.visible { opacity: 1; }

/* ── Textarea ───────────────────────────────────────────────── */
.editor-wrapper { flex: 1; }

.main-editor {
  width: 100%;
  /* Viewport-aware height: fills screen minus header + toolbar + mini-bar */
  height: calc(100vh - var(--header-h) - 42px - 56px - var(--space-4) - 2px);
  min-height: 320px;
  max-height: 680px;
  padding: var(--space-5) var(--space-6);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.8;
  color: var(--color-text);
  background: var(--color-surface);
  border: none;
  outline: none;
  resize: none; /* no resize — height is managed */
  transition: background var(--transition-slow), color var(--transition-slow);
  display: block;
  overflow-y: auto;
}

.main-editor::placeholder {
  color: var(--color-muted);
  opacity: 0.45;
  line-height: 1.8;
}

.main-editor:focus-visible {
  outline: none;
  box-shadow: none;
}

/* ── Mini Stats Bar ─────────────────────────────────────────── */
.mini-stats-bar {
  display: flex;
  align-items: center;
  justify-content: space-around;
  padding: 10px var(--space-4);
  border-top: 1px solid var(--color-border);
  background: var(--color-bg);
  gap: var(--space-2);
  min-height: 52px;
  flex-shrink: 0;
}

.mini-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1px;
  flex: 1;
}

.mini-stat-value {
  font-family: var(--font-mono);
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--color-primary);
  transition: all 0.2s ease;
  line-height: 1;
}

.mini-stat-label {
  font-size: 0.5625rem;
  font-weight: 600;
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.mini-stat-divider {
  width: 1px;
  height: 26px;
  background: var(--color-border);
  flex-shrink: 0;
}

/* ── Stats Panel ────────────────────────────────────────────── */
.stats-panel {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  position: sticky;
  top: calc(var(--header-h) + var(--space-4));
  /* Match editor height so panel fills same vertical space */
  max-height: calc(100vh - var(--header-h) - var(--space-8));
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--color-border) transparent;
}

.stats-panel::-webkit-scrollbar       { width: 3px; }
.stats-panel::-webkit-scrollbar-track { background: transparent; }
.stats-panel::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 99px;
}

/* ── Stats Card ─────────────────────────────────────────────── */
.stats-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  padding: 14px 16px;
  box-shadow: var(--shadow-xs);
  transition: box-shadow var(--transition);
}

.stats-card:hover { box-shadow: var(--shadow-sm); }

.stats-card-title {
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-muted);
  margin-bottom: var(--space-3);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

/* ── Stat Row ───────────────────────────────────────────────── */
.stat-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 0;
  border-bottom: 1px solid var(--color-border-light);
}

.stat-row:last-child  { border-bottom: none; padding-bottom: 0; }
.stat-row:first-of-type { padding-top: 0; }

.stat-label {
  font-size: 0.8125rem;
  color: var(--color-muted);
}

.stat-value {
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text);
  transition: all 0.2s ease;
}

.stat-value.primary {
  color: var(--color-primary);
  font-weight: 700;
  font-size: 1rem;
}

.stat-value.accent {
  color: var(--color-secondary);
  font-weight: 600;
}

/* ── Badge ──────────────────────────────────────────────────── */
.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 99px;
  font-size: 0.6875rem;
  font-weight: 600;
  font-family: var(--font-body);
  background: var(--color-primary-light);
  color: var(--color-primary);
}

.badge-easy   { background: rgba(34,197,94,.12);  color: #16a34a; }
.badge-medium { background: rgba(245,158,11,.12); color: #d97706; }
.badge-hard   { background: rgba(255,77,79,.12);  color: #dc2626; }

/* ── Readability Bar ────────────────────────────────────────── */
.readability-bar-wrap { margin: var(--space-2) 0 var(--space-1); }

.readability-bar {
  height: 5px;
  background: var(--color-border);
  border-radius: 99px;
  overflow: hidden;
}

.readability-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(
    90deg,
    var(--color-error)     0%,
    var(--color-warning)   35%,
    var(--color-secondary) 65%,
    var(--color-success)   100%
  );
  border-radius: 99px;
  transition: width 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.readability-labels {
  display: flex;
  justify-content: space-between;
  font-size: 0.5625rem;
  color: var(--color-muted);
  margin-top: 3px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ── Keyword List ───────────────────────────────────────────── */
.keyword-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.keyword-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  animation: fadeIn 0.22s ease forwards;
}

.keyword-word {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-text);
  min-width: 68px;
  flex-shrink: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.keyword-bar-wrap {
  flex: 1;
  height: 4px;
  background: var(--color-border);
  border-radius: 99px;
  overflow: hidden;
}

.keyword-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
  border-radius: 99px;
  transition: width 0.4s ease;
  min-width: 4px;
}

.keyword-pct {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  color: var(--color-muted);
  min-width: 32px;
  text-align: right;
}

.empty-state {
  font-size: 0.8125rem;
  color: var(--color-muted);
  text-align: center;
  padding: var(--space-3) 0;
  font-style: italic;
}

/* ── Drag Over ──────────────────────────────────────────────── */
.editor-panel.drag-over {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-glow), var(--shadow-md);
}

.editor-panel.drag-over .main-editor {
  background: var(--color-primary-light);
}

/* ── Copy Success ───────────────────────────────────────────── */
.toolbar-btn.copied {
  color: var(--color-secondary) !important;
  background: var(--color-secondary-light) !important;
  border-color: rgba(30,138,138,0.3) !important;
}