/* --- 1. 基础变量与容器：恢复内边距以解决超界问题 --- */
.tool-wrapper {
    --n-shadow-l: #ffffff;
    --n-shadow-d: #d1d9e6;
    --n-p: #007bff;
    --n-t: #313d5a;
    --n-tg: #a0aec0;
    margin: 0px auto;
    padding: 20px; /* 关键：恢复 20px 内边距，确保内容不超出两边边界 */
    box-sizing: border-box;
}

.tool-title { 
    font-size: 24px; 
    color: var(--n-t); 
    margin-bottom: 30px; 
    text-align: center; 
    font-weight: bold;
}

/* --- 2. 拟态按钮：凸起效果 --- */
.tool-btn {
    border: none;
    outline: none;
    padding: 8px 22px;
    border-radius: 10px;
    background: transparent;
    font-size: 14px;
    color: var(--n-t);
    cursor: pointer;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    box-shadow: 4px 4px 8px var(--n-shadow-d), -4px -4px 8px var(--n-shadow-l);
    margin-right: 10px;
}

.tool-btn.primary { color: var(--n-p); font-weight: 500; }
.tool-btn.danger { color: #ef4444; }

.tool-btn:active {
    box-shadow: inset 3px 3px 6px var(--n-shadow-d), inset -3px -3px 6px var(--n-shadow-l);
    transform: scale(0.97);
}

/* --- 3. 文本框：深度内凹 --- */
.word-textarea {
    width: 100%;
    height: 260px;
    border: none !important;
    outline: none !important;
    padding: 20px;
    border-radius: 20px;
    background: transparent;
    color: var(--n-t);
    box-sizing: border-box;
    box-shadow: inset 6px 6px 12px var(--n-shadow-d), inset -6px -6px 12px var(--n-shadow-l);
    margin-bottom: 20px;
    font-size: 16px;
    line-height: 1.6;
    resize: vertical;
}

/* --- 4. 统计网格 --- */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 20px;
    margin: 10px 0 30px 0;
}

.stat-card {
    padding: 20px 10px;
    border-radius: 15px;
    text-align: center;
    box-shadow: 6px 6px 12px var(--n-shadow-d), -6px -6px 12px var(--n-shadow-l);
}

.stat-label { display: block; font-size: 12px; color: var(--n-tg); margin-bottom: 10px; }
.stat-value { font-size: 20px; font-weight: bold; color: var(--n-p); }

/* --- 5. 介绍区：修正对齐逻辑 --- */
.tool-intro-section {
    margin-top: 50px;
    padding: 30px;
    border-radius: 20px;
    /* 内凹背景确保视觉深度 */
    box-shadow: inset 6px 6px 12px var(--n-shadow-d), inset -6px -6px 12px var(--n-shadow-l);
}

.intro-title {
    font-size: 18px;
    color: var(--n-p); 
    font-weight: bold;
    margin: 0 0 15px 0; /* 彻底移除左边距 */
    padding: 0;
    border: none;
    text-align: left; /* 强制左对齐 */
}

.intro-content {
    color: var(--n-t);
    font-size: 14px;
    line-height: 1.8;
    text-align: left;
}

.intro-content p, .intro-content ul {
    margin-left: 0; /* 确保段落没有额外的左边距 */
}

/* --- 6. 移动端适配 --- */
@media (max-width: 768px) { 
    .stats-grid { grid-template-columns: 1fr 1fr; } 
    .tool-wrapper { padding: 10px; } /* 窄屏缩小内距 */
}