/* ============================================
   在线工具箱 - 工具页样式
   卡片、表单、按钮、Toast、首页布局
   ============================================ */

/* --- 工具页面布局 --- */
.tool-page {
  max-width: 100%;
  margin: 0 auto;
  padding: var(--space-lg);
}

.tool-header {
  margin-bottom: var(--space-xl);
}

.tool-header h1 {
  margin-bottom: var(--space-xs);
}

.tool-header p {
  color: var(--color-text-secondary);
  font-size: var(--text-md);
}

/* --- 卡片 --- */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  box-shadow: var(--shadow-xs);
  transition: box-shadow var(--transition-fast), transform var(--transition-fast);
}

.card:hover {
  box-shadow: var(--shadow-sm);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--color-border);
}

.card-title {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text);
}

/* --- 首页 Hero --- */
.hero {
  text-align: center;
  padding: var(--space-3xl) var(--space-md);
  margin-bottom: var(--space-xl);
}

.hero h1 {
  font-size: var(--text-5xl);
  font-weight: 800;
  margin-bottom: var(--space-sm);
  background: var(--color-primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  color: var(--color-text-secondary);
  font-size: var(--text-xl);
}

/* --- 首页分类卡片网格 --- */
.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: var(--space-lg);
  padding: 0 var(--space-lg) var(--space-2xl);
}

.category-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  transition: box-shadow var(--transition-fast), transform var(--transition-fast);
  text-decoration: none;
  color: inherit;
  display: block;
}

.category-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  color: inherit;
}

.category-card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--color-primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-md);
}

.category-card-icon svg {
  width: 24px;
  height: 24px;
  color: var(--color-primary);
}

.category-card h3 {
  font-size: var(--text-xl);
  margin-bottom: var(--space-xs);
}

.category-card .tool-count {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
}

.category-card .tool-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
}

.category-card .tool-tag {
  display: inline-block;
  padding: 4px 10px;
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
  text-decoration: none;
}

.category-card .tool-tag:hover {
  background: var(--color-primary-light);
  color: var(--color-primary);
}

/* --- 按钮 --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: 8px 20px;
  font-size: var(--text-base);
  font-weight: 500;
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast), color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
  white-space: nowrap;
  user-select: none;
  line-height: 1.4;
}

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

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

.btn-primary:hover {
  background: var(--color-primary-hover);
  color: #ffffff;
}

.btn-secondary {
  background: var(--color-surface);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  background: var(--color-surface-hover);
  border-color: var(--color-text-muted);
}

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

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

.btn-success {
  background: var(--color-success);
  color: #ffffff;
}

.btn-success:hover {
  background: var(--color-success-hover);
  color: #ffffff;
}

.btn-danger {
  background: var(--color-error);
  color: #ffffff;
}

.btn-danger:hover {
  background: var(--color-error-hover);
  color: #ffffff;
}

.btn-sm {
  padding: 5px 12px;
  font-size: var(--text-sm);
}

.btn-lg {
  padding: 12px 28px;
  font-size: var(--text-lg);
}

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

.btn-icon svg {
  width: 18px;
  height: 18px;
}

.btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

/* --- 表单元素 --- */
.form-group {
  margin-bottom: var(--space-md);
}

.form-label {
  display: block;
  font-size: var(--text-base);
  font-weight: 500;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xs);
}

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

.form-input:focus-visible,
.form-select:focus-visible,
.form-textarea:focus-visible {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.12);
}

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

.form-textarea {
  min-height: 160px;
  resize: vertical;
  font-family: var(--font-mono);
  font-size: var(--text-base);
  line-height: 1.6;
}

.form-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  padding-right: 36px;
  cursor: pointer;
}

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

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

.form-hint {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-top: var(--space-xs);
}

.form-checkbox {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  cursor: pointer;
  font-size: var(--text-base);
  color: var(--color-text-secondary);
}

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

/* --- 输入/输出区域 --- */
.io-area {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.io-area-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-sm) var(--space-md);
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
}

.io-area-body {
  padding: var(--space-md);
}

.io-area textarea {
  width: 100%;
  min-height: 160px;
  border: none;
  background: transparent;
  color: var(--color-text);
  font-family: var(--font-mono);
  font-size: var(--text-base);
  line-height: 1.6;
  resize: vertical;
  outline: none;
}

.io-area textarea:focus-visible {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.12);
}

/* --- 统计结果卡片 --- */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: var(--space-sm);
}

.stat-item {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  text-align: center;
}

.stat-value {
  font-size: var(--text-3xl);
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.2;
  font-variant-numeric: tabular-nums;
}

.stat-label {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-top: var(--space-xs);
}

/* --- 换算工具布局 --- */
.converter {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
}

.converter-row {
  display: flex;
  align-items: stretch;
  gap: var(--space-md);
}

/* 垂直排列的输入/输出区域 */
.converter-row-vertical {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.converter-row-vertical > .io-area {
  flex: 1;
}

.converter-row-vertical > .io-area .io-area-body {
  min-height: 200px;
}

.converter-field {
  flex: 1;
}

.converter-field label {
  display: block;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xs);
}

.converter-field input {
  width: 100%;
  padding: 10px 14px;
  font-size: var(--text-lg);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  outline: none;
  transition: border-color var(--transition-fast);
}

.converter-field input:focus-visible {
  border-color: var(--color-primary);
}

.converter-field select {
  width: 100%;
  margin-top: var(--space-xs);
  padding: 8px 14px;
  font-size: var(--text-base);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  outline: none;
  cursor: pointer;
}

.converter-field select:focus-visible {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.12);
}

.converter-swap {
  flex-shrink: 0;
}

.swap-btn {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--color-primary-light);
  color: var(--color-primary);
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.swap-btn:hover {
  background: var(--color-primary);
  color: #ffffff;
  transform: rotate(180deg);
}

.swap-btn svg {
  width: 20px;
  height: 20px;
}

/* 换算结果表格 */
.conversion-table {
  margin-top: var(--space-lg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow-x: auto;
}

.conversion-table table {
  width: 100%;
  border-collapse: collapse;
}

.conversion-table th,
.conversion-table td {
  padding: 10px var(--space-md);
  text-align: left;
  border-bottom: 1px solid var(--color-border);
  font-size: var(--text-base);
}

.conversion-table th {
  background: var(--color-bg);
  font-weight: 600;
  color: var(--color-text-secondary);
}

.conversion-table tr:last-child td {
  border-bottom: none;
}

.conversion-table tr:hover td {
  background: var(--color-surface-hover);
}

.conversion-table .result-value {
  font-family: var(--font-mono);
  color: var(--color-primary);
  font-weight: 500;
  font-variant-numeric: tabular-nums;
}

/* --- 图片上传区域 --- */
.upload-area {
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl) var(--space-lg);
  text-align: center;
  cursor: pointer;
  transition: border-color var(--transition-fast), background var(--transition-fast);
}

.upload-area:hover,
.upload-area.drag-over {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
}

.upload-icon {
  margin: 0 auto var(--space-md);
  width: 48px;
  height: 48px;
  color: var(--color-text-muted);
}

.upload-area p {
  color: var(--color-text-secondary);
  font-size: var(--text-md);
}

.upload-area .upload-hint {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-top: var(--space-xs);
}

.upload-btn {
  color: var(--color-primary);
  font-weight: 500;
  text-decoration: underline;
  cursor: pointer;
}

/* --- 图片预览 --- */
.image-preview {
  margin-top: var(--space-md);
  text-align: center;
}

.image-preview img,
.image-preview canvas {
  max-width: 100%;
  max-height: 400px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

/* --- Toast 通知 --- */
.toast-container {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.toast {
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  color: #ffffff;
  font-size: var(--text-base);
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  transform: translateX(120%);
  transition: transform var(--transition-normal);
  max-width: 360px;
}

.toast.show {
  transform: translateX(0);
}

.toast-success {
  background: var(--color-success);
}

.toast-error {
  background: var(--color-error);
}

.toast-info {
  background: var(--color-info);
}

.toast-warning {
  background: var(--color-warning);
}

/* --- 复制按钮 --- */
.copy-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 4px 10px;
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xs);
  cursor: pointer;
  transition: background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}

.copy-btn:hover {
  background: var(--color-surface-hover);
  color: var(--color-text);
}

.copy-btn.copied {
  color: var(--color-success);
  border-color: var(--color-success);
}

.copy-btn svg {
  width: 14px;
  height: 14px;
}

/* --- 标签/徽章 --- */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  font-size: var(--text-xs);
  font-weight: 500;
  border-radius: var(--radius-xs);
}

.badge-primary {
  background: var(--color-primary-light);
  color: var(--color-primary);
}

.badge-success {
  background: var(--color-success-light);
  color: var(--color-success);
}

/* --- 分割线 --- */
.divider {
  height: 1px;
  background: var(--color-border);
  margin: var(--space-lg) 0;
}

/* --- 选项卡 --- */
.tabs {
  display: flex;
  gap: 2px;
  border-bottom: 2px solid var(--color-border);
  margin-bottom: var(--space-lg);
}

.tab-btn {
  padding: 10px 20px;
  font-size: var(--text-base);
  font-weight: 500;
  color: var(--color-text-secondary);
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

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

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

/* --- 模态框 --- */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--color-overlay);
  z-index: var(--z-modal);
  align-items: center;
  justify-content: center;
  padding: var(--space-lg);
}

.modal-overlay.show {
  display: flex;
}

.modal {
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  width: 100%;
  max-width: 560px;
  max-height: 80vh;
  overflow-y: auto;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-lg);
  border-bottom: 1px solid var(--color-border);
}

.modal-header h3 {
  font-size: var(--text-xl);
}

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

.modal-close:hover {
  background: var(--color-surface-hover);
}

.modal-body {
  padding: var(--space-lg);
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  border-top: 1px solid var(--color-border);
}

/* --- 页脚 --- */
.site-footer {
  padding: var(--space-xl) var(--space-lg);
  text-align: center;
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  border-top: 1px solid var(--color-border);
  flex-shrink: 0;
}

.site-footer a {
  color: var(--color-text-secondary);
}

.site-footer a:hover {
  color: var(--color-primary);
}

/* --- 空状态 --- */
.empty-state {
  text-align: center;
  padding: var(--space-2xl);
  color: var(--color-text-muted);
}

.empty-state svg {
  width: 48px;
  height: 48px;
  margin: 0 auto var(--space-md);
  opacity: 0.5;
}

/* --- 加载指示器 --- */
.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-xl);
}

.spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* --- 文本对比结果 --- */
.diff-result {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  max-height: 500px;
  overflow-y: auto;
}

.diff-line {
  display: flex;
  align-items: stretch;
  font-family: var(--font-mono);
  font-size: var(--text-base);
  line-height: 1.6;
  border-bottom: 1px solid var(--color-border);
}

.diff-line:last-child {
  border-bottom: none;
}

.diff-line-num {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  flex-shrink: 0;
  font-weight: 600;
  color: #ffffff;
  user-select: none;
}

.diff-line-content {
  flex: 1;
  padding: 4px 12px;
  white-space: pre-wrap;
  word-break: break-all;
  min-height: 1.6em;
}

.diff-equal {
  background: var(--color-bg);
}

.diff-equal .diff-line-num {
  background: var(--color-text-muted);
}

.diff-added {
  background: rgba(16, 185, 129, 0.1);
}

.diff-added .diff-line-num {
  background: #10b981;
}

.diff-added .diff-line-content {
  color: #065f46;
}

.diff-deleted {
  background: rgba(239, 68, 68, 0.1);
}

.diff-deleted .diff-line-num {
  background: #ef4444;
}

.diff-deleted .diff-line-content {
  color: #991b1b;
}

/* 暗黑模式适配 */
[data-theme="dark"] .diff-added {
  background: rgba(16, 185, 129, 0.15);
}

[data-theme="dark"] .diff-added .diff-line-content {
  color: #6ee7b7;
}

[data-theme="dark"] .diff-deleted {
  background: rgba(239, 68, 68, 0.15);
}

[data-theme="dark"] .diff-deleted .diff-line-content {
  color: #fca5a5;
}

/* --- 响应式 --- */
@media (max-width: 768px) {
  .tool-page {
    padding: var(--space-md);
  }

  .hero {
    padding: var(--space-xl) var(--space-md);
  }

  .hero h1 {
    font-size: var(--text-4xl);
  }

  .category-grid {
    grid-template-columns: 1fr;
    padding: 0 var(--space-md) var(--space-xl);
  }

  .converter-row {
    flex-direction: column;
    align-items: stretch;
  }

  .converter-swap {
    align-self: center;
  }

  .swap-btn {
    transform: rotate(90deg);
  }

  .swap-btn:hover {
    transform: rotate(270deg);
  }

  .form-row {
    flex-direction: column;
  }

  .stat-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .tabs {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .tab-btn {
    flex-shrink: 0;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: var(--text-3xl);
  }

  .hero p {
    font-size: var(--text-lg);
  }

  .btn-group {
    flex-direction: column;
  }

  .btn-group .btn {
    width: 100%;
  }
}

/* --- 统一 focus-visible 焦点样式 --- */
.btn:focus-visible,
.copy-btn:focus-visible,
.tab-btn:focus-visible,
.modal-close:focus-visible,
.swap-btn:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}