:root {
  --bg: #f5f1ea;
  --surface: #ffffff;
  --accent: #e4572e;
  --accent-soft: #f7d5c7;
  --text-main: #2b251f;
  --text-soft: #7c6f63;
  --border: #ddd0c3;
  --shadow-soft: 0 8px 22px rgba(0, 0, 0, 0.08);
  --radius-lg: 18px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --transition-fast: 0.15s ease-out;
}

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

html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: var(--bg);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text", sans-serif;
  color: var(--text-main);
}

body {
  display: flex;
  align-items: stretch;
  justify-content: center;
}

#app {
  width: 100%;
  height: 100vh;
  max-width: 900px;
  padding: 10px 8px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

/* Top bar */

.top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 10px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.85);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.04);
  backdrop-filter: blur(12px);
}

.header-actions {
  display: flex;
  gap: 4px;
}

.brand {
  font-weight: 600;
  letter-spacing: 0.08em;
  font-size: 12px;
  text-transform: uppercase;
  color: var(--text-soft);
}

.icon-button {
  border: none;
  outline: none;
  background: transparent;
  width: 32px;
  height: 32px;
  border-radius: 999px;
  font-size: 16px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--text-soft);
  transition: background var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}

.icon-button:active {
  transform: scale(0.95);
}

.icon-button:hover {
  background: rgba(0, 0, 0, 0.04);
}

/* Layout */

.main-layout {
  flex: 1;
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 10px;
}

/* Mobile fallback: single column (still one screen height) */

@media (max-width: 720px) {
  .main-layout {
    grid-template-columns: 1fr;
    grid-template-rows: minmax(0, 1.1fr) minmax(0, 1fr);
  }
}

/* Left pane */

.left-pane {
  background: var(--surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-soft);
  padding: 10px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.story-input textarea,
.version-input textarea {
  width: 100%;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  padding: 8px 10px;
  font-family: inherit;
  font-size: 13px;
  resize: none;
  outline: none;
  background: #fdfbf8;
  transition: border var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
}

.story-input textarea:focus,
.version-input textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent-soft);
  background: #fffdf9;
}

.story-input textarea {
  height: 80px;
}

.refine-toolbar {
  display: flex;
  gap: 6px;
  margin-top: 6px;
  flex-wrap: wrap;
}

.refine-btn {
  border: 1px solid var(--border);
  background: transparent;
  border-radius: 999px;
  padding: 4px 10px;
  font-size: 11px;
  color: var(--text-soft);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.refine-btn:hover {
  background: var(--surface);
  border-color: var(--text-soft);
  color: var(--text-main);
}

.refine-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.version-input textarea {
  height: 140px;
}

.story-input {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.input-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2px;
}

.input-footer-buttons {
  display: flex;
  gap: 6px;
  align-items: center;
}

#charCount {
  font-size: 11px;
  color: var(--text-soft);
}

.primary-button {
  border: none;
  outline: none;
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 500;
  background: var(--accent);
  color: #fff;
  box-shadow: 0 10px 20px rgba(228, 87, 46, 0.4);
  transition: background var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

.secondary-button {
  border: none;
  outline: none;
  padding: 5px 11px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 500;
  background: #f2e6d9;
  color: var(--text-soft);
  transition: background var(--transition-fast), transform var(--transition-fast), color var(--transition-fast);
}

.secondary-button:active {
  transform: translateY(1px) scale(0.98);
}

.secondary-button:disabled {
  opacity: 0.5;
}

.primary-button:active {
  transform: translateY(1px) scale(0.98);
  box-shadow: 0 6px 14px rgba(228, 87, 46, 0.3);
}

.primary-button:disabled {
  opacity: 0.45;
  box-shadow: none;
}

/* Modes strip */

.modes-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

.mode-chip {
  border-radius: 999px;
  border: 1px solid transparent;
  padding: 3px 8px;
  font-size: 11px;
  background: #f2e6d9;
  color: var(--text-soft);
  outline: none;
  transition: background var(--transition-fast), color var(--transition-fast), border var(--transition-fast);
}

.mode-chip--active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

/* Right pane */

.right-pane {
  background: var(--surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-soft);
  padding: 8px;
  display: flex;
  flex-direction: column;
}

.versions-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 4px;
}

/* Tabs */

.tabs {
  display: flex;
  gap: 4px;
  overflow-x: auto;
  padding-bottom: 2px;
}

.tabs::-webkit-scrollbar {
  display: none;
}

.tab {
  border-radius: 999px;
  border: 1px solid transparent;
  padding: 3px 8px;
  font-size: 11px;
  background: #f4ece3;
  color: var(--text-soft);
  white-space: nowrap;
}

.tab--active {
  background: #2f2620;
  color: #fdfbf8;
}

/* Versions list */

.versions-list {
  flex: 1;
  overflow-y: auto;
  padding-right: 2px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.versions-list::-webkit-scrollbar {
  width: 4px;
}

.versions-list::-webkit-scrollbar-thumb {
  background: rgba(0, 0, 0, 0.18);
  border-radius: 999px;
}

.version-card {
  border-radius: var(--radius-md);
  border: 1px solid #eee0cf;
  background: #fffdf9;
  padding: 7px 8px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.version-topline {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.version-mode-tag {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-soft);
}

.version-time {
  font-size: 10px;
  color: var(--text-soft);
}

.version-core {
  font-size: 11px;
  color: var(--text-soft);
  border-left: 2px solid #e4d2bd;
  padding-left: 6px;
  margin-top: 2px;
}

.version-body {
  font-size: 12px;
  line-height: 1.35;
}

.version-actions {
  display: flex;
  gap: 6px;
  margin-top: 4px;
}

.version-image img {
  width: 100%;
  border-radius: var(--radius-sm);
  margin-top: 8px;
  object-fit: cover;
  background: #f0ebe1;
  min-height: 100px;
}

.version-action-button {
  border-radius: 999px;
  border: 1px dashed #e2d5c6;
  background: #faf3ea;
  padding: 2px 7px;
  font-size: 10px;
  color: var(--text-soft);
}

/* Utility hidden */

.hidden {
  display: none !important;
}