:root {
  --bg-color: #f7f9fc;
  --surface-color: #ffffff;
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --primary-color: #3b82f6;
  --danger-color: #ef4444;
  --border-color: #e2e8f0;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-hover: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-full: 9999px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-color);
  color: var(--text-primary);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* Utils */
.truncate {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.spacer-10 {
  height: 10rem;
}

/* Layout */
#app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.view-container {
  display: flex;
  flex-direction: column;
  flex: 1;
  animation: fadeIn 0.4s ease-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Navbar */
.navbar {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: var(--shadow-sm);
}

.navbar h1 {
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.025em;
  margin: 0;
}

.actions {
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

button {
  cursor: pointer;
  border: none;
  background: transparent;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-md);
  font-weight: 500;
  font-size: 0.9rem;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-primary);
}

button:hover {
  background-color: #f1f5f9;
}

button.active {
  background-color: #e0e7ff;
  color: #4f46e5;
}

.btn-primary {
  background: var(--primary-color);
  color: white;
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  background: #2563eb;
  color: white;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-primary:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

.back-btn {
  color: var(--text-secondary);
  padding-left: 0;
}

.back-btn:hover {
  color: var(--text-primary);
  background: transparent;
  transform: translateX(-2px);
}

/* Home */
.home-main, .user-main {
  padding: 2rem 1.5rem;
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
}

.category-section {
  margin-bottom: 3rem;
}

.category-section h2 {
  font-size: 1.5rem;
  margin-bottom: 1.5rem;
  color: var(--text-secondary);
  font-weight: 500;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.5rem;
}

.user-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 1.5rem;
}

.user-card {
  background: var(--surface-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem 1rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  box-shadow: var(--shadow-md);
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid transparent;
}

.user-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
  border-color: #bfdbfe;
}

.avatar {
  width: 80px;
  height: 80px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, #a855f7 0%, #3b82f6 100%);
  margin-bottom: 1rem;
  position: relative;
  box-shadow: inset 0 2px 4px rgba(255,255,255,0.3), 0 4px 8px rgba(59,130,246,0.3);
}

/* Add some random gradients via CSS if needed, but a single nice one is fine */
.user-card:nth-child(2n) .avatar { background: linear-gradient(135deg, #f43f5e 0%, #f97316 100%); }
.user-card:nth-child(3n) .avatar { background: linear-gradient(135deg, #10b981 0%, #3b82f6 100%); }
.user-card:nth-child(4n) .avatar { background: linear-gradient(135deg, #ec4899 0%, #8b5cf6 100%); }

.red-dot {
  position: absolute;
  top: 0;
  right: 0;
  width: 18px;
  height: 18px;
  background-color: var(--danger-color);
  border-radius: 50%;
  border: 3px solid var(--surface-color);
  box-shadow: 0 2px 4px rgba(239,68,68,0.4);
}

.username {
  font-weight: 600;
  font-size: 1.05rem;
  margin-bottom: 0.25rem;
}

.work-count {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* User Page */
.work-category h3 {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin: 1.5rem 0 1rem;
}

.work-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.work-item {
  background: var(--surface-color);
  padding: 1rem 1.25rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid var(--border-color);
}

.work-item:hover {
  box-shadow: var(--shadow-md);
  border-color: #cbd5e1;
}

.work-item.is-selected {
  border-color: var(--primary-color);
  background-color: #eff6ff;
}

.work-title {
  flex: 1;
  font-weight: 500;
  margin: 0 1rem;
}

.work-meta {
  font-size: 0.85rem;
  color: var(--text-secondary);
  background: #f1f5f9;
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-md);
}

.checkbox {
  width: 20px;
  height: 20px;
  border: 2px solid #cbd5e1;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.checkbox.checked {
  background-color: var(--primary-color);
  border-color: var(--primary-color);
}

.checkbox.checked::after {
  content: '';
  width: 5px;
  height: 10px;
  border: solid white;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg) translateY(-1px);
}

.delete-mark {
  color: var(--danger-color);
  font-size: 1.2rem;
}

.floating-action-bar {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(30, 41, 59, 0.9);
  backdrop-filter: blur(8px);
  color: white;
  padding: 1rem 2rem;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  gap: 2rem;
  box-shadow: 0 10px 25px rgba(0,0,0,0.2);
  z-index: 50;
  animation: slideUp 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

@keyframes slideUp {
  from { opacity: 0; transform: translate(-50%, 20px); }
  to { opacity: 1; transform: translate(-50%, 0); }
}

/* Novel View */
.novel-navbar {
  flex-wrap: wrap;
  gap: 1rem;
}

.novel-actions {
  flex-wrap: wrap;
}

.model-select {
  padding: 0.5rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background: var(--surface-color);
  outline: none;
}

.stream-toggle {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.9rem;
  cursor: pointer;
}

.novel-main {
  flex: 1;
  max-width: 800px;
  margin: 0 auto;
  width: 100%;
  padding: 2rem 1.5rem 2rem;
  font-size: 1.1rem;
  line-height: 1.8;
  letter-spacing: 0.01em;
  color: #334155;
}

.phone-mode .novel-main {
  font-size: 1.4rem;
  line-height: 2;
}

.line-group {
  margin-bottom: 1.25rem;
}

.original-line {
  margin-bottom: 0.25rem;
}

.translation-line {
  color: #047857; /* A pleasant green for translations */
  margin-bottom: 0.5rem;
}

.translation-line.pending {
  animation: pulse 1.5s infinite ease-in-out;
}

@keyframes pulse {
  0% { opacity: 0.6; }
  50% { opacity: 1; }
  100% { opacity: 0.6; }
}

.afterword-title {
  font-weight: bold;
  font-size: 1.2em;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.translation-stats {
  background: var(--surface-color);
  border-top: 1px solid var(--border-color);
  padding: 0.75rem;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-top: 2rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.error-text {
  color: var(--danger-color);
}

.loading {
  text-align: center;
  padding: 3rem;
  color: var(--text-secondary);
  font-style: italic;
}

/* Annotation Tooltip */
.annotated-word {
  color: #3b82f6;
  cursor: pointer;
  position: relative;
  border-bottom: 1px dashed #3b82f6;
  transition: color 0.2s ease;
}

.annotated-word:hover {
  color: #2563eb;
}

.annotation-tooltip {
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  background: #1e293b;
  color: #f1f5f9;
  padding: 0.5rem 0.75rem;
  border-radius: 8px;
  font-size: 0.85rem;
  line-height: 1.5;
  width: max-content;
  max-width: 300px;
  white-space: normal;
  word-break: break-word;
  z-index: 100;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  pointer-events: none;
  display: none;
}

/* Desktop: show on hover */
.annotated-word:hover > .annotation-tooltip {
  display: block;
  animation: tooltipFadeIn 0.2s ease-out;
}

/* Mobile: show when active (clicked) */
.annotated-word.tooltip-active > .annotation-tooltip {
  display: block;
  animation: tooltipFadeIn 0.2s ease-out;
}

.annotation-tooltip::after {
  content: '';
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 6px solid transparent;
  border-top-color: #1e293b;
}

@keyframes tooltipFadeIn {
  from { opacity: 0; transform: translateX(-50%) translateY(4px); }
  to { opacity: 1; transform: translateX(-50%) translateY(0); }
}