/**
 * Ubit8Tools 全局工具页样式库
 * 统一所有工具页的公共样式变量、组件和动画
 * 版本: 5.0 | 包含: CSS变量 / 统计卡片 / 按钮系统 / 输入卡片 / 结果卡片 / Toast / 历史记录 / 功能说明卡片
 * =============================================================================
 * 【迁移说明】每个 views/*.php 工具页请删除各自的 <style> 块，
 * 改为在 <head> 中引入本文件: <link rel="stylesheet" href="/static/css/tools-base.css">
 * =============================================================================
 */

/* ============================================================
   1. CSS 变量（Theme Variables）
   每个工具页可覆盖 --tool-primary 等变量实现不同配色
   ============================================================ */
:root {
    /* 主色调（默认紫色，工具页可覆盖） */
    --tool-primary:       #8b5cf6;
    --tool-primary-light: #a78bfa;
    --tool-primary-dark:  #7c3aed;
    --tool-primary-bg:    #f5f3ff;

    /* 辅助色 */
    --tool-blue:     #3b82f6;
    --tool-green:    #10b981;
    --tool-orange:   #f97316;
    --tool-red:      #ef4444;
    --tool-pink:     #ec4899;
    --tool-purple:   #8b5cf6;

    /* 语义色 */
    --tool-success-bg: #f0fdf4;
    --tool-error-bg:   #fef2f2;
    --tool-warning-bg: #fffbeb;

    /* 边框与阴影 */
    --tool-border:       #e2e8f0;
    --tool-border-focus: rgba(139, 92, 246, 0.25);
    --tool-shadow:       0 2px 8px rgba(0, 0, 0, 0.08);
    --tool-shadow-md:    0 4px 16px rgba(0, 0, 0, 0.10);
    --tool-shadow-lg:    0 8px 24px rgba(0, 0, 0, 0.12);

    /* 圆角 */
    --tool-radius:    12px;
    --tool-radius-sm: 8px;
    --tool-radius-lg: 16px;

    /* 字体 */
    --tool-font-mono: 'JetBrains Mono', 'Consolas', 'Courier New', monospace;
    --tool-font-ui:   system-ui, -apple-system, sans-serif;
}

/* ============================================================
   2. 页面容器
   ============================================================ */
.tool-page {
    padding: 24px 16px 48px;
    animation: toolSlideDown 0.4s ease;
}

/* ============================================================
   3. 统计卡片网格（Stats Grid）
   用法: <div class="tool-stats-grid">...</div>
   每个卡片支持 .blue/.green/.orange/.pink 等色变体
   ============================================================ */
.tool-stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 10px;
    margin-bottom: 20px;
}

.tool-stat-card {
    background: linear-gradient(135deg, var(--tool-primary), var(--tool-primary-light));
    border-radius: var(--tool-radius);
    padding: 14px 16px;
    color: #fff;
    cursor: pointer;
    transition: all 0.25s;
    position: relative;
    overflow: hidden;
    user-select: none;
}

.tool-stat-card::before {
    content: '';
    position: absolute;
    top: -20px;
    right: -20px;
    width: 80px;
    height: 80px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    transition: all 0.25s;
}

.tool-stat-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(139, 92, 246, 0.35);
}

.tool-stat-card:hover::before {
    width: 120px;
    height: 120px;
    top: -40px;
    right: -40px;
}

/* 统计卡片色变体 */
.tool-stat-card.blue   { background: linear-gradient(135deg, var(--tool-blue),   #60a5fa); }
.tool-stat-card.blue:hover  { box-shadow: 0 6px 20px rgba(59, 130, 246, 0.35); }

.tool-stat-card.green  { background: linear-gradient(135deg, var(--tool-green),  #34d399); }
.tool-stat-card.green:hover { box-shadow: 0 6px 20px rgba(16, 185, 129, 0.35); }

.tool-stat-card.orange { background: linear-gradient(135deg, var(--tool-orange), #fb923c); }
.tool-stat-card.orange:hover { box-shadow: 0 6px 20px rgba(249, 115, 22, 0.35); }

.tool-stat-card.red    { background: linear-gradient(135deg, var(--tool-red),    #f87171); }
.tool-stat-card.red:hover  { box-shadow: 0 6px 20px rgba(239, 68, 68, 0.35); }

.tool-stat-card.pink   { background: linear-gradient(135deg, var(--tool-pink),   #f472b6); }
.tool-stat-card.pink:hover  { box-shadow: 0 6px 20px rgba(236, 72, 153, 0.35); }

.tool-stat-card .stat-label {
    font-size: 13px;
    opacity: 0.85;
    margin-bottom: 4px;
    display: flex;
    align-items: center;
    gap: 5px;
}

.tool-stat-card .stat-value {
    font-size: 18px;
    font-weight: 700;
    font-family: var(--tool-font-mono);
    word-break: break-all;
}

.tool-stat-card .copy-hint {
    position: absolute;
    top: 8px;
    right: 8px;
    font-size: 11px;
    opacity: 0;
    transition: opacity 0.2s;
    pointer-events: none;
}

.tool-stat-card:hover .copy-hint { opacity: 0.6; }

/* ============================================================
   4. Tab 标签页
   用法: <div class="tool-tabs"><button class="tool-tab active">Tab1</button>...</div>
   ============================================================ */
.tool-tabs {
    display: flex;
    gap: 6px;
    margin-bottom: 16px;
    background: #f1f5f9;
    padding: 5px;
    border-radius: var(--tool-radius);
    flex-wrap: wrap;
}

.tool-tab {
    flex: 1;
    min-width: 80px;
    padding: 10px 12px;
    border: none;
    background: transparent;
    border-radius: 9px;
    font-size: 15px;
    font-weight: 500;
    color: #64748b;
    cursor: pointer;
    transition: all 0.25s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    white-space: nowrap;
}

.tool-tab:hover {
    color: #1e293b;
    background: rgba(255, 255, 255, 0.6);
}

.tool-tab.active {
    background: #fff;
    color: var(--tool-primary);
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.10);
}

.tool-tab svg { width: 15px; height: 15px; }

/* ============================================================
   5. 输入卡片
   用法: 包裹 <textarea> 和操作按钮
   ============================================================ */
.tool-input-section { margin-bottom: 16px; }

.tool-input-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 8px;
}

.tool-input-label {
    font-size: 15px;
    font-weight: 600;
    color: #334155;
    display: flex;
    align-items: center;
    gap: 6px;
}

.tool-input-label svg { color: var(--tool-primary); }

.tool-char-count {
    font-size: 13px;
    color: #94a3b8;
    font-family: var(--tool-font-mono);
}

.tool-input-card {
    background: #fff;
    border-radius: var(--tool-radius);
    border: 2px solid var(--tool-border);
    overflow: hidden;
    transition: border-color 0.3s, box-shadow 0.3s;
}

.tool-input-card:focus-within {
    border-color: var(--tool-primary);
    box-shadow: 0 0 0 3px var(--tool-border-focus);
}

.tool-input-area { display: flex; align-items: stretch; }

.tool-input-icon {
    padding: 14px 12px 0 14px;
    color: #94a3b8;
    flex-shrink: 0;
}

.tool-textarea {
    flex: 1;
    border: none;
    background: transparent;
    outline: none;
    font-size: 16px;
    font-family: var(--tool-font-mono);
    color: #1e293b;
    line-height: 1.6;
    padding: 12px 14px;
    min-height: 120px;
    resize: vertical;
    width: 100%;
    box-sizing: border-box;
}

.tool-textarea::placeholder { color: #94a3b8; }

.tool-input-actions {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 10px 8px 0;
    border-top: 1px solid #f1f5f9;
    background: #fafbfc;
    flex-wrap: wrap;
}

/* ============================================================
   6. 按钮系统
   primary / green / blue / ghost / danger / clear
   ============================================================ */
.tool-btn-row {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    align-items: center;
    flex-wrap: wrap;
}

.tool-btn {
    flex: 1;
    min-width: 100px;
    padding: 13px 20px;
    border: none;
    border-radius: var(--tool-radius);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 7px;
    transition: all 0.25s;
    text-nowrap: true;
}

.tool-btn svg { width: 16px; height: 16px; }

.tool-btn-primary {
    background: linear-gradient(135deg, var(--tool-primary), var(--tool-primary-light));
    color: #fff;
    box-shadow: 0 3px 12px rgba(139, 92, 246, 0.30);
}

.tool-btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 5px 18px rgba(139, 92, 246, 0.40);
}

.tool-btn-primary:active { transform: translateY(0); }

.tool-btn-green {
    background: linear-gradient(135deg, var(--tool-green), #34d399);
    color: #fff;
    box-shadow: 0 3px 12px rgba(16, 185, 129, 0.30);
}

.tool-btn-green:hover {
    transform: translateY(-1px);
    box-shadow: 0 5px 18px rgba(16, 185, 129, 0.40);
}

.tool-btn-blue {
    background: linear-gradient(135deg, var(--tool-blue), #60a5fa);
    color: #fff;
    box-shadow: 0 3px 12px rgba(59, 130, 246, 0.30);
}

.tool-btn-blue:hover {
    transform: translateY(-1px);
    box-shadow: 0 5px 18px rgba(59, 130, 246, 0.40);
}

.tool-btn-ghost {
    background: #f1f5f9;
    color: #64748b;
}

.tool-btn-ghost:hover { background: #e2e8f0; color: #1e293b; }

.tool-btn-danger {
    background: linear-gradient(135deg, var(--tool-red), #f87171);
    color: #fff;
    box-shadow: 0 3px 12px rgba(239, 68, 68, 0.30);
}

.tool-btn-danger:hover {
    transform: translateY(-1px);
    box-shadow: 0 5px 18px rgba(239, 68, 68, 0.40);
}

.tool-btn-clear {
    background: transparent;
    color: #94a3b8;
    font-size: 13px;
    padding: 13px 14px;
    flex: 0 0 auto;
}

.tool-btn-clear:hover { color: var(--tool-red); }

.tool-btn-sm {
    padding: 7px 12px;
    font-size: 13px;
    flex: 0 0 auto;
}

/* 按钮动作样式（小按钮，放在输入卡片底部） */
.tool-action-btn {
    padding: 7px 12px;
    border: 1px solid var(--tool-border);
    background: #fff;
    border-radius: var(--tool-radius-sm);
    font-size: 13px;
    color: #64748b;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 4px;
    transition: all 0.2s;
}

.tool-action-btn:hover {
    border-color: var(--tool-primary);
    color: var(--tool-primary);
    background: var(--tool-primary-bg);
}

.tool-action-btn svg { width: 12px; height: 12px; }

/* ============================================================
   7. 结果卡片
   用法: <div class="tool-result-card" onclick="toolCopy(this)">...</div>
   ============================================================ */
.tool-result-section { margin-bottom: 20px; }

.tool-result-label {
    font-size: 15px;
    font-weight: 600;
    color: #64748b;
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.tool-result-label svg { color: var(--tool-primary); }

.tool-result-card {
    background: #fff;
    border: 2px solid var(--tool-border);
    border-radius: var(--tool-radius);
    padding: 14px 16px;
    cursor: pointer;
    transition: all 0.25s;
    position: relative;
    margin-bottom: 10px;
}

.tool-result-card:hover {
    border-color: var(--tool-primary);
    box-shadow: var(--tool-shadow);
    transform: translateY(-1px);
}

.tool-result-card .result-type {
    font-size: 13px;
    font-weight: 600;
    color: #94a3b8;
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 5px;
}

.tool-result-card .result-type .dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    display: inline-block;
}

.tool-result-card .result-value {
    font-family: var(--tool-font-mono);
    font-size: 16px;
    color: #1e293b;
    word-break: break-all;
    line-height: 1.7;
    min-height: 24px;
    max-height: 300px;
    overflow-y: auto;
}

.tool-result-card .result-empty {
    color: #cbd5e1;
    font-style: italic;
}

.tool-result-card .copy-icon {
    position: absolute;
    top: 10px;
    right: 10px;
    width: 16px;
    height: 16px;
    color: #cbd5e1;
    transition: color 0.2s;
}

.tool-result-card:hover .copy-icon { color: var(--tool-primary); }

.tool-result-card.copied {
    border-color: var(--tool-green);
    background: var(--tool-success-bg);
}

.tool-result-card.copied .copy-icon { color: var(--tool-green); }

/* 全宽卡片 */
.tool-result-card.full {
    grid-column: 1 / -1;
    padding: 18px 20px;
}

/* 格式列表项 */
.tool-format-item {
    display: flex;
    flex-direction: column;
    gap: 6px;
    padding: 12px 14px;
    background: #f8fafc;
    border-radius: var(--tool-radius-sm);
    font-size: 14px;
    transition: all 0.2s;
    cursor: pointer;
    border: 1px solid transparent;
}

.tool-format-item:hover {
    background: #f1f5f9;
    border-color: var(--tool-primary);
}

.tool-format-item .format-label {
    color: #64748b;
    font-size: 13px;
    font-weight: 500;
}

.tool-format-item .format-value {
    font-family: var(--tool-font-mono);
    font-size: 14px;
    color: #1e293b;
    word-break: break-all;
}

.tool-format-item.full { grid-column: 1 / -1; }

/* ============================================================
   8. 文件上传区
   用法: <div class="tool-file-drop">...</div>
   ============================================================ */
.tool-file-drop {
    border: 2px dashed var(--tool-border);
    border-radius: var(--tool-radius);
    padding: 30px;
    text-align: center;
    transition: all 0.25s;
    cursor: pointer;
    background: #fafbfc;
}

.tool-file-drop:hover,
.tool-file-drop.dragover {
    border-color: var(--tool-blue);
    background: #eff6ff;
}

.tool-file-drop input { display: none; }

.tool-file-drop .drop-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto 12px;
    color: #94a3b8;
}

.tool-file-drop .drop-text {
    font-size: 15px;
    color: #64748b;
    margin-bottom: 6px;
}

.tool-file-drop .drop-hint {
    font-size: 13px;
    color: #94a3b8;
}

/* 文件预览 */
.tool-file-preview {
    background: #fff;
    border: 2px solid var(--tool-border);
    border-radius: var(--tool-radius);
    padding: 16px;
    margin-top: 12px;
    display: none;
}

.tool-file-preview.show { display: block; }

.tool-file-info {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
}

.tool-file-icon {
    width: 40px;
    height: 40px;
    background: #eff6ff;
    border-radius: var(--tool-radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--tool-blue);
    flex-shrink: 0;
}

.tool-file-details { flex: 1; min-width: 0; }

.tool-file-name {
    font-size: 14px;
    font-weight: 600;
    color: #1e293b;
    word-break: break-all;
}

.tool-file-size {
    font-size: 13px;
    color: #94a3b8;
    margin-top: 2px;
}

.tool-remove-file {
    width: 28px;
    height: 28px;
    border: none;
    background: var(--tool-error-bg);
    border-radius: 50%;
    color: var(--tool-red);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    flex-shrink: 0;
}

.tool-remove-file:hover {
    background: var(--tool-red);
    color: #fff;
}

/* ============================================================
   9. 历史记录
   ============================================================ */
.tool-history { margin-bottom: 20px; }

.tool-history-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 10px;
}

.tool-history-title {
    font-size: 15px;
    font-weight: 600;
    color: #64748b;
    display: flex;
    align-items: center;
    gap: 5px;
}

.tool-history-title svg { width: 14px; height: 14px; }

.tool-clear-history {
    font-size: 13px;
    color: #94a3b8;
    background: none;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 2px 6px;
    border-radius: 6px;
    transition: all 0.2s;
}

.tool-clear-history:hover {
    color: var(--tool-red);
    background: var(--tool-error-bg);
}

.tool-clear-history svg { width: 12px; height: 12px; }

.tool-history-list {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.tool-history-item {
    background: #fff;
    border: 1px solid var(--tool-border);
    border-radius: var(--tool-radius);
    padding: 10px 14px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    cursor: pointer;
    transition: all 0.2s;
    animation: toolFadeIn 0.3s ease;
}

.tool-history-item:hover {
    border-color: var(--tool-primary);
    background: var(--tool-primary-bg);
}

.tool-history-input {
    font-size: 14px;
    color: #334155;
    font-family: var(--tool-font-mono);
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.tool-history-arrow { color: #cbd5e1; flex-shrink: 0; }

.tool-history-result {
    font-size: 13px;
    color: #94a3b8;
    font-family: var(--tool-font-mono);
    flex-shrink: 0;
    max-width: 140px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.tool-history-empty {
    text-align: center;
    padding: 20px;
    color: #94a3b8;
    font-size: 14px;
    background: #f8fafc;
    border-radius: var(--tool-radius);
    border: 1px dashed var(--tool-border);
}

/* ============================================================
   10. 功能说明卡片（Tip Cards）
   用法: <div class="tool-tips-grid"><div class="tool-tip-card">...</div></div>
   ============================================================ */
.tool-tips-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-top: 28px;
}

.tool-tip-card {
    background: #fff;
    border-radius: var(--tool-radius);
    overflow: hidden;
    border: 1px solid var(--tool-border);
    transition: all 0.25s;
}

.tool-tip-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--tool-shadow-md);
}

.tool-tip-card--primary { border-top: 3px solid var(--tool-primary); }
.tool-tip-card--blue    { border-top: 3px solid var(--tool-blue); }
.tool-tip-card--green   { border-top: 3px solid var(--tool-green); }
.tool-tip-card--orange  { border-top: 3px solid var(--tool-orange); }
.tool-tip-card--red     { border-top: 3px solid var(--tool-red); }

.tool-tip-header {
    padding: 14px 16px 10px;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 15px;
    font-weight: 600;
    color: #1e293b;
}

.tool-tip-icon {
    width: 28px;
    height: 28px;
    border-radius: var(--tool-radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.tool-tip-card--primary .tool-tip-icon { background: var(--tool-primary-bg); }
.tool-tip-card--primary .tool-tip-icon svg { color: var(--tool-primary); }
.tool-tip-card--blue    .tool-tip-icon { background: #eff6ff; }
.tool-tip-card--blue    .tool-tip-icon svg { color: var(--tool-blue); }
.tool-tip-card--green   .tool-tip-icon { background: var(--tool-success-bg); }
.tool-tip-card--green   .tool-tip-icon svg { color: var(--tool-green); }
.tool-tip-card--orange  .tool-tip-icon { background: var(--tool-warning-bg); }
.tool-tip-card--orange  .tool-tip-icon svg { color: var(--tool-orange); }
.tool-tip-card--red     .tool-tip-icon { background: var(--tool-error-bg); }
.tool-tip-card--red     .tool-tip-icon svg { color: var(--tool-red); }

.tool-tip-icon svg { width: 14px; height: 14px; }

.tool-tip-card ul {
    list-style: none;
    margin: 0;
    padding: 0 16px 14px;
}

.tool-tip-card li {
    padding: 6px 0;
    font-size: 14px;
    color: #64748b;
    display: flex;
    align-items: flex-start;
    gap: 8px;
    border-bottom: 1px solid #f8fafc;
}

.tool-tip-card li:last-child { border-bottom: none; }

.tool-bullet {
    width: 5px;
    height: 5px;
    border-radius: 50%;
    flex-shrink: 0;
    margin-top: 6px;
}

.tool-bullet--primary { background: var(--tool-primary); }
.tool-bullet--blue    { background: var(--tool-blue); }
.tool-bullet--green   { background: var(--tool-green); }
.tool-bullet--orange  { background: var(--tool-orange); }
.tool-bullet--red     { background: var(--tool-red); }

/* ============================================================
   10b. 功能说明（列表形式）
   用法: <div class="tool-tips"><div class="tips-header">标题</div><ul class="tips-list">...</ul></div>
   ============================================================ */
.tool-tips {
    margin-top: 16px;
    background: #fff;
    border: 1px solid var(--tool-border);
    border-radius: var(--tool-radius);
    overflow: hidden;
}

.tips-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 16px;
    background: #f8fafc;
    border-bottom: 1px solid var(--tool-border);
    font-size: 13px;
    font-weight: 600;
    color: #334155;
}

.tips-header svg { color: var(--tool-primary); flex-shrink: 0; }

.tips-list {
    list-style: none;
    margin: 0;
    padding: 12px 16px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.tips-list li {
    font-size: 13px;
    color: #64748b;
    line-height: 1.5;
    padding: 0;
    border: none;
}

.tips-list li strong {
    color: var(--tool-primary);
    font-weight: 600;
}

.tips-list li strong.green { color: var(--tool-green); }
.tips-list li strong.orange { color: var(--tool-orange); }
.tips-list li strong.blue { color: var(--tool-blue); }

.tips-hint { margin-top: 12px; }
.tips-hint .tips-header svg { color: var(--tool-orange); }

/* ============================================================
   11. Toast 提示
   用法: HTML 放 <div id="tool-toast" class="tool-toast"></div>
   JS调用: toolToast('操作成功', 'success')
   ============================================================ */
.tool-toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(80px);
    background: #1e293b;
    color: #fff;
    padding: 10px 20px;
    border-radius: 50px;
    font-size: 13px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.20);
    z-index: 9999;
    transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    pointer-events: none;
    white-space: nowrap;
}

.tool-toast.show { transform: translateX(-50%) translateY(0); }
.tool-toast.success { background: var(--tool-green); }
.tool-toast.error   { background: var(--tool-red); }
.tool-toast.info    { background: var(--tool-blue); }
.tool-toast.warning { background: var(--tool-orange); }

/* ============================================================
   12. Tab 面板（与 .tool-tab 配合）
   用法: <div class="tool-tab-panel" id="panel-xxx">...</div>
   ============================================================ */
.tool-tab-panel { display: none; }
.tool-tab-panel.active { display: block; }

/* ============================================================
   13. 通用设置卡片
   用法: <div class="tool-settings-card">...</div>
   ============================================================ */
.tool-settings-card {
    background: #fff;
    border: 1px solid var(--tool-border);
    border-radius: var(--tool-radius);
    padding: 20px 24px;
    margin-bottom: 16px;
    box-shadow: var(--tool-shadow);
}

.tool-settings-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 16px;
    padding-bottom: 14px;
    border-bottom: 1px solid var(--tool-border);
}

.tool-settings-header svg { width: 20px; height: 20px; color: var(--tool-primary); }
.tool-settings-header h3  { font-size: 15px; font-weight: 600; color: #1e293b; margin: 0; }

/* 选项网格 */
.tool-options-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 16px;
}

.tool-option-group {
    background: #f8fafc;
    border-radius: var(--tool-radius-sm);
    padding: 14px 16px;
    border: 1px solid var(--tool-border);
}

.tool-option-label {
    font-size: 12px;
    font-weight: 600;
    color: #64748b;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.tool-option-label svg { width: 14px; height: 14px; }

/* 选项按钮组 */
.tool-format-btns {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.tool-format-btn {
    padding: 8px 14px;
    border: 1.5px solid var(--tool-border);
    background: #fff;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 500;
    color: #334155;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 6px;
}

.tool-format-btn:hover {
    border-color: var(--tool-primary-light);
    color: var(--tool-primary);
}

.tool-format-btn.active {
    border-color: var(--tool-primary);
    background: var(--tool-primary-bg);
    color: var(--tool-primary);
}

.tool-format-btn input { display: none; }

/* ============================================================
   14. 图片预览区
   ============================================================ */
.tool-image-preview {
    background: #fff;
    border: 2px solid var(--tool-border);
    border-radius: var(--tool-radius);
    padding: 16px;
    margin-top: 12px;
    display: none;
}

.tool-image-preview.show { display: block; }

.tool-image-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.tool-image-box { text-align: center; }

.tool-image-box img {
    max-width: 100%;
    max-height: 150px;
    border-radius: var(--tool-radius-sm);
    border: 1px solid var(--tool-border);
}

.tool-image-box .box-label {
    font-size: 13px;
    color: #94a3b8;
    margin-top: 6px;
}

/* ============================================================
   15. 滚动条美化
   ============================================================ */
.tool-textarea::-webkit-scrollbar,
.tool-result-value::-webkit-scrollbar,
.tool-history-list::-webkit-scrollbar {
    width: 6px;
}

.tool-textarea::-webkit-scrollbar-track,
.tool-result-value::-webkit-scrollbar-track,
.tool-history-list::-webkit-scrollbar-track {
    background: #f1f5f9;
    border-radius: 3px;
}

.tool-textarea::-webkit-scrollbar-thumb,
.tool-result-value::-webkit-scrollbar-thumb,
.tool-history-list::-webkit-scrollbar-thumb {
    background: var(--tool-border);
    border-radius: 3px;
}

.tool-textarea::-webkit-scrollbar-thumb:hover,
.tool-result-value::-webkit-scrollbar-thumb:hover {
    background: #94a3b8;
}

/* ============================================================
   16. 分析网格（Analysis Grid）
   用法: <div class="tool-analysis-grid">...</div>
   ============================================================ */
.tool-analysis-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
    margin-bottom: 16px;
}

.tool-analysis-item {
    padding: 14px 16px;
    background: #f8fafc;
    border-radius: var(--tool-radius-sm);
    border-left: 3px solid var(--tool-primary);
}

.tool-analysis-item:nth-child(1) { border-left-color: var(--tool-primary); }
.tool-analysis-item:nth-child(2) { border-left-color: var(--tool-green); }
.tool-analysis-item:nth-child(3) { border-left-color: var(--tool-orange); }
.tool-analysis-item:nth-child(4) { border-left-color: var(--tool-blue); }

.tool-analysis-label {
    font-size: 11px;
    color: #94a3b8;
    margin-bottom: 4px;
}

.tool-analysis-value {
    font-size: 20px;
    font-weight: 700;
    font-family: var(--tool-font-mono);
}

.tool-analysis-item:nth-child(1) .tool-analysis-value { color: var(--tool-primary); }
.tool-analysis-item:nth-child(2) .tool-analysis-value { color: var(--tool-green); }
.tool-analysis-item:nth-child(3) .tool-analysis-value { color: var(--tool-orange); }
.tool-analysis-item:nth-child(4) .tool-analysis-value { color: var(--tool-blue); }

/* 字符分析 */
.tool-char-breakdown { font-size: 13px; line-height: 1.8; color: #1e293b; }

.tool-char-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 0;
    border-bottom: 1px solid #f8fafc;
}

.tool-char-item:last-child { border-bottom: none; }

.tool-char-name   { width: 60px; color: #94a3b8; }
.tool-char-count  { font-weight: 600; min-width: 40px; }
.tool-char-percent { color: #94a3b8; font-size: 12px; }

/* ============================================================
   17. 动画
   ============================================================ */
@keyframes toolSlideDown {
    from { opacity: 0; transform: translateY(-12px); }
    to   { opacity: 1; transform: translateY(0); }
}

@keyframes toolFadeIn {
    from { opacity: 0; transform: translateY(4px); }
    to   { opacity: 1; transform: translateY(0); }
}

@keyframes toolSlideIn {
    from { opacity: 0; transform: translateX(-10px); }
    to   { opacity: 1; transform: translateX(0); }
}

/* ============================================================
   18. 响应式（移动端适配）
   ============================================================ */
@media (max-width: 600px) {
    .tool-page { padding: 16px 12px 40px; }

    .tool-tab { font-size: 12px; padding: 8px 6px; }
    .tool-tab span { display: none; } /* 手机上隐藏Tab文字 */

    .tool-options-grid { grid-template-columns: 1fr; }
    .tool-image-grid   { grid-template-columns: 1fr; }
    .tool-tips-grid    { grid-template-columns: 1fr; }
    .tool-btn-row      { flex-wrap: wrap; }
    .tool-analysis-grid { grid-template-columns: repeat(2, 1fr); }

    .tool-stat-card .stat-value { font-size: 16px; }
    .tool-stat-card .stat-label { font-size: 12px; }
}
