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

html, body {
  height: 100%;
  background: #000;
  color: #d0d0d0;
  font-family: 'IBM Plex Mono', monospace;
}

/* --- Scrollbar --- */

#editor::-webkit-scrollbar {
  width: 6px;
}

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

#editor::-webkit-scrollbar-thumb {
  background: #2a2a2a;
  border-radius: 3px;
}

#editor::-webkit-scrollbar-thumb:hover {
  background: #444;
}

/* Firefox */
#editor {
  scrollbar-width: thin;
  scrollbar-color: #2a2a2a transparent;
}

/* --- Tabs --- */

#tabs {
  display: flex;
  justify-content: center;
  gap: 2px;
  padding: 1rem 1rem 0;
}

.tab {
  background: none;
  border: none;
  color: #333;
  font-family: inherit;
  font-size: 0.85rem;
  padding: 0.4rem 0.9rem;
  cursor: pointer;
  border-radius: 4px 4px 0 0;
  transition: color 0.15s, background 0.15s;
}

.tab:hover {
  color: #666;
}

.tab.active {
  color: #d0d0d0;
  background: #111;
}

.tab.has-content {
  color: #555;
}

.tab.has-content.active {
  color: #d0d0d0;
}

/* --- Writing surface --- */

#page {
  max-width: 860px;
  margin: 0 auto;
  padding: 1rem 2rem 1rem;
  min-height: 100%;
  display: flex;
  flex-direction: column;
}

#editor {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  resize: none;
  color: #d0d0d0;
  font-family: inherit;
  font-size: 1.1rem;
  line-height: 1.8;
  width: 100%;
  caret-color: #d0d0d0;
}

#editor::placeholder {
  color: #444;
}

/* --- Status bar --- */

#status {
  height: 2rem;
  display: flex;
  align-items: center;
  color: #555;
  font-size: 0.8rem;
}

#status.generating {
  animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 0.5; }
  50% { opacity: 1; }
}

/* --- Settings gear --- */

#settings-btn {
  position: fixed;
  top: 1rem;
  right: 1rem;
  background: none;
  border: none;
  color: #2a2a2a;
  font-size: 1.4rem;
  cursor: pointer;
  padding: 0.5rem;
  line-height: 1;
  transition: color 0.2s;
}

#settings-btn:hover {
  color: #666;
}

/* --- Modal --- */

#modal {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
}

#modal.hidden {
  display: none;
}

#modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.85);
}

#modal-content {
  position: relative;
  background: #111;
  border: 1px solid #2a2a2a;
  border-radius: 8px;
  padding: 2rem;
  width: 90%;
  max-width: 420px;
}

#modal-content h2 {
  font-size: 1rem;
  font-weight: 400;
  color: #666;
  margin-bottom: 1.5rem;
}

#modal-content label {
  display: block;
  font-size: 0.8rem;
  color: #555;
  margin-bottom: 0.5rem;
}

#key-help {
  color: #555;
  text-decoration: none;
  margin-left: 0.4em;
  transition: color 0.2s;
}

#key-help:hover {
  color: #888;
}

#modal-content input {
  width: 100%;
  background: #000;
  border: 1px solid #2a2a2a;
  border-radius: 4px;
  color: #d0d0d0;
  font-family: inherit;
  font-size: 0.85rem;
  padding: 0.6rem 0.8rem;
  outline: none;
  margin-bottom: 1.5rem;
}

#modal-content input:focus {
  border-color: #444;
}

.range-row {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.range-row .range-field {
  flex: 1;
}

.range-row .range-field label {
  margin-bottom: 0.35rem;
}

.range-row .range-field input {
  margin-bottom: 0;
}

.setting-section {
  color: #444;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.75rem;
  padding-top: 0.5rem;
  border-top: 1px solid #1a1a1a;
}

.setting-section:first-of-type {
  border-top: none;
  padding-top: 0;
}

#modal-actions {
  display: flex;
  gap: 0.75rem;
  justify-content: flex-end;
}

#modal-actions button {
  background: #1a1a1a;
  border: 1px solid #2a2a2a;
  border-radius: 4px;
  color: #888;
  font-family: inherit;
  font-size: 0.8rem;
  padding: 0.5rem 1.2rem;
  cursor: pointer;
  transition: background 0.2s;
}

#modal-actions button:hover {
  background: #2a2a2a;
}

#save-btn {
  background: #0a2a0a;
  border-color: #1a4a1a;
  color: #6a6;
}

#save-btn:hover {
  background: #1a3a1a;
}

/* --- Mobile --- */

@media (max-width: 600px) {
  #page {
    padding: 1.5rem 1.2rem 0.5rem;
  }

  #editor {
    font-size: 1rem;
    line-height: 1.7;
  }

  #settings-btn {
    top: 0.5rem;
    right: 0.5rem;
  }
}