/* ===== 按钮系统 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
  font-weight: 500;
  transition: all var(--transition-fast);
  white-space: nowrap;
  user-select: none;
}

.btn:active {
  transform: scale(0.97);
}

.btn-primary {
  background: var(--color-work);
  color: #fff;
  box-shadow: 0 2px 8px rgba(74, 144, 217, 0.3);
}

.btn-primary:hover {
  background: #3A7BC8;
  box-shadow: 0 4px 14px rgba(74, 144, 217, 0.4);
}

.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

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

.btn-danger {
  background: #E74C3C;
  color: #fff;
}

.btn-danger:hover {
  background: #C0392B;
}

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

.btn-ghost:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.btn-icon {
  width: 36px;
  height: 36px;
  padding: 0;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
}

.btn-icon:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.btn-sm {
  padding: 4px 10px;
  font-size: var(--font-size-xs);
  border-radius: var(--radius-sm);
}

/* ===== 表单 ===== */
.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.form-label {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--text-secondary);
}

.form-input,
.form-select,
.form-textarea {
  padding: 10px 14px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: var(--font-size-base);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  outline: none;
  width: 100%;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  border-color: var(--color-work);
  box-shadow: 0 0 0 3px rgba(74, 144, 217, 0.15);
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--text-tertiary);
}

.form-textarea {
  resize: vertical;
  min-height: 60px;
}

.form-row {
  display: flex;
  gap: var(--space-md);
}

.form-row > * {
  flex: 1;
}

.form-check {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  cursor: pointer;
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  user-select: none;
}

.form-check input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--color-work);
  cursor: pointer;
}

/* ===== 分类标签 ===== */
.category-tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: 600;
}

.cat-work { background: var(--color-work-bg); color: var(--color-work-text); }
.cat-personal { background: var(--color-personal-bg); color: var(--color-personal-text); }
.cat-study { background: var(--color-study-bg); color: var(--color-study-text); }
.cat-health { background: var(--color-health-bg); color: var(--color-health-text); }
.cat-other { background: var(--color-other-bg); color: var(--color-other-text); }

.category-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.dot-work { background: var(--color-work); }
.dot-personal { background: var(--color-personal); }
.dot-study { background: var(--color-study); }
.dot-health { background: var(--color-health); }
.dot-other { background: var(--color-other); }

/* ===== 模态框 ===== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: var(--bg-modal-overlay);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.modal-overlay.open {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  width: 90%;
  max-width: 480px;
  max-height: 90vh;
  overflow-y: auto;
  transform: scale(0.95) translateY(10px);
  transition: transform var(--transition-normal);
}

.modal-overlay.open .modal {
  transform: scale(1) translateY(0);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-xl) var(--space-xl) var(--space-md);
}

.modal-title {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--text-primary);
}

.modal-body {
  padding: 0 var(--space-xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.modal-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-xl);
  gap: var(--space-md);
}

.modal-footer .btn {
  flex: 1;
}

/* ===== 确认对话框 ===== */
.confirm-overlay {
  position: fixed;
  inset: 0;
  background: var(--bg-modal-overlay);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1100;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.confirm-overlay.open {
  opacity: 1;
  visibility: visible;
}

.confirm-dialog {
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  padding: var(--space-2xl);
  text-align: center;
  max-width: 360px;
  width: 90%;
}

.confirm-dialog p {
  margin-bottom: var(--space-xl);
  color: var(--text-secondary);
  font-size: var(--font-size-base);
  line-height: 1.6;
}

.confirm-dialog .btn-row {
  display: flex;
  gap: var(--space-md);
}

.confirm-dialog .btn-row .btn {
  flex: 1;
}

/* ===== Toast 提示 ===== */
.toast-container {
  position: fixed;
  bottom: var(--space-xl);
  right: var(--space-xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  z-index: 1200;
}

.toast {
  padding: 12px 20px;
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  font-size: var(--font-size-sm);
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  animation: toastIn 0.3s ease;
  border-left: 3px solid var(--color-work);
}

.toast.success { border-left-color: var(--color-personal); }
.toast.error { border-left-color: #E74C3C; }

@keyframes toastIn {
  from { opacity: 0; transform: translateX(20px); }
  to { opacity: 1; transform: translateX(0); }
}

/* ===== 空状态 ===== */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-3xl);
  text-align: center;
  color: var(--text-tertiary);
  gap: var(--space-md);
}

.empty-state i {
  opacity: 0.4;
}

.empty-state p {
  font-size: var(--font-size-sm);
}