/* 卡片基础样式 */
.iopaint-card {
    background: #fff;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
    margin-bottom: 30px;
}

.section-title {
    font-size: 1.4rem;
    font-weight: bold;
    color: #34495e;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
}

.section-title::before {
    content: '';
    width: 5px;
    height: 1.4rem;
    background: #3498db;
    margin-right: 12px;
    border-radius: 3px;
}

/* 特色标签 */
.feature-tag-group {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.feature-tag {
    background: #e1f5fe;
    color: #0288d1;
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 500;
}

/* 步骤详解样式 */
.tutorial-steps {
    display: flex;
    flex-direction: column;
    gap: 40px;
}

.step-box {
    border-bottom: 1px dashed #eee;
    padding-bottom: 30px;
}

.step-text {
    font-size: 1.1rem;
    color: #2c3e50;
    margin-bottom: 15px;
}

.step-badge {
    background: #34495e;
    color: white;
    width: 24px;
    height: 24px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-size: 0.8rem;
    margin-right: 10px;
    vertical-align: middle;
}

/* 核心：大图自适应处理 */
.step-img {
    display: block;
    max-width: 100%;  /* 关键：图片宽度不超过容器，适配 1900px 大图 */
    height: auto;     /* 关键：等比缩放 */
    border-radius: 8px;
    border: 1px solid #ddd;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

/* 下载部分 */
.download-container {
    display: flex;
    gap: 20px;
    align-items: center;
    padding-top: 10px;
}

.dl-btn {
    text-decoration: none;
    padding: 12px 25px;
    border-radius: 6px;
    font-weight: bold;
    transition: all 0.2s;
}

.pan-btn {
    background: #2ecc71;
    color: #fff;
}

.dl-btn:hover {
    opacity: 0.9;
    transform: translateY(-2px);
}

.pan-pwd {
    margin-left: 10px;
    font-size: 0.9rem;
}