/* ========================================
   Components - 通用UI组件样式
   ======================================== */

/* === 按钮 === */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: 0.5rem 1.25rem;
  border-radius: var(--radius-md);
  font-weight: 500;
  font-size: 0.9rem;
  transition: all var(--transition-fast);
  white-space: nowrap;
  user-select: none;
}

.btn-primary {
  background: var(--accent-primary);
  color: #fff;
}

.btn-primary:hover {
  background: var(--accent-primary-hover);
  box-shadow: 0 4px 12px var(--accent-ring);
}

.btn-secondary {
  background: var(--frame-border);
  color: var(--frame-text);
}

.btn-secondary:hover {
  background: var(--frame-border-hover);
}

.btn-ghost {
  background: transparent;
  color: var(--frame-text-secondary);
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.05);
  color: var(--frame-text);
}

.btn-sm {
  padding: 0.3rem 0.75rem;
  font-size: 0.8rem;
}

.btn-lg {
  padding: 0.75rem 2rem;
  font-size: 1rem;
}

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

/* === 表单 === */
.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-label {
  display: block;
  font-size: 0.85rem;
  color: var(--frame-text-secondary);
  margin-bottom: var(--spacing-xs);
  font-weight: 500;
}

.form-input {
  width: 100%;
  padding: 0.65rem 1rem;
  background: var(--field-bg);
  border: 1px solid var(--frame-border);
  border-radius: var(--radius-md);
  color: var(--frame-text);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  outline: none;
}

.form-input:focus {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px var(--accent-primary-light);
}

.form-input::placeholder {
  color: var(--frame-text-secondary);
  opacity: 0.6;
}

.form-error {
  font-size: 0.8rem;
  color: var(--accent-red);
  margin-top: var(--spacing-xs);
}

/* === 卡片 === */
.card {
  background: var(--frame-bg-secondary);
  border: 1px solid var(--frame-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  transition: all var(--transition-normal);
}

.card:hover {
  border-color: var(--accent-primary);
  box-shadow: var(--shadow-md);
}

.card-title {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: var(--spacing-md);
}

/* === 模态框 === */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  animation: fadeIn 200ms ease-out;
}

.modal-content {
  background: var(--frame-bg-secondary);
  border: 1px solid var(--frame-border);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  max-width: 500px;
  width: 90%;
  box-shadow: var(--shadow-lg);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-lg);
}

.modal-title {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 600;
}

.modal-close {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  color: var(--frame-text-secondary);
  transition: all var(--transition-fast);
}

.modal-close:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--frame-text);
}

/* === 标签 === */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.15rem 0.6rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 500;
}

.badge-basic {
  background: rgba(100, 116, 139, 0.2);
  color: var(--version-basic);
  border: 1px solid rgba(100, 116, 139, 0.3);
}

.badge-cognitive {
  background: var(--version-cognitive-tint);
  color: var(--version-cognitive);
  border: 1px solid var(--version-cognitive-border);
}

.badge-metacognitive {
  background: var(--version-metacognitive-tint);
  color: var(--version-metacognitive);
  border: 1px solid var(--version-metacognitive-border);
}

.badge-unassigned {
  background: rgba(239, 68, 68, 0.15);
  color: var(--accent-red);
  border: 1px solid rgba(239, 68, 68, 0.3);
}

/* === 选项卡 === */
.tabs {
  display: flex;
  gap: var(--spacing-xs);
  border-bottom: 1px solid var(--frame-border);
  margin-bottom: var(--spacing-lg);
}

.tab-item {
  padding: 0.5rem 1rem;
  font-size: 0.9rem;
  color: var(--frame-text-secondary);
  border-bottom: 2px solid transparent;
  transition: all var(--transition-fast);
  cursor: pointer;
}

.tab-item:hover {
  color: var(--frame-text);
}

.tab-item.active {
  color: var(--accent-primary);
  border-bottom-color: var(--accent-primary);
}

/* === 加载动画 === */
.spinner {
  width: 20px;
  height: 20px;
  border: 2px solid var(--frame-border);
  border-top-color: var(--accent-primary);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

/* === 空状态 === */
.empty-state {
  text-align: center;
  padding: var(--spacing-2xl);
  color: var(--frame-text-secondary);
}

.empty-state-icon {
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
  opacity: 0.5;
}

.empty-state-text {
  font-size: 0.95rem;
}