body { background-color: #f5f8fb; font-family: "Microsoft YaHei", sans-serif; }
.main-content { min-height: 600px; padding: 40px 0; } 

/* =========================================
   新增：顶部 Banner (英雄榜) 样式
   ========================================= */
.hero-banner {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%); /* 蓝青色渐变背景 */
    /* 或者使用更接近图片的深蓝渐变： background: linear-gradient(to right, #4364f7, #6fb1fc); */
    padding: 80px 0;
    color: #fff;
    position: relative;
    overflow: hidden;
}
.hero-banner .hero-img {
    box-shadow: 0 10px 30px rgba(0,0,0,0.2); /* 图片阴影 */
    border-radius: 8px;
    transform: perspective(1000px) rotateY(5deg); /* 微微的3D倾斜效果，更有质感 */
    transition: all 0.5s;
    max-width: 100%;
}
.hero-banner .hero-img:hover {
    transform: perspective(1000px) rotateY(0deg);
}
.hero-content { padding-left: 40px; }
.hero-title { font-size: 36px; font-weight: bold; margin-bottom: 20px; display: flex; align-items: center; }
.hero-icon { 
    font-size: 40px; margin-right: 15px; opacity: 0.9; 
    /* 如果你有logo图片，可以用 img 标签替换这个 icon */
}
.hero-info p { font-size: 16px; margin-bottom: 10px; opacity: 0.9; }
.hero-btn {
    background-color: #28a745; /* 绿色按钮 */
    color: white;
    padding: 12px 40px;
    font-size: 18px;
    border-radius: 5px;
    border: none;
    margin-top: 30px;
    transition: all 0.3s;
    display: inline-block;
    text-decoration: none;
    font-weight: bold;
    box-shadow: 0 5px 15px rgba(40, 167, 69, 0.4);
}
.hero-btn:hover {
    background-color: #218838;
    transform: translateY(-2px);
    color: #fff;
    text-decoration: none;
}

/* 手机适配 Banner */
@media (max-width: 768px) {
    .hero-banner { padding: 40px 0; text-align: center; }
    .hero-content { padding-left: 0; margin-top: 30px; }
    .hero-title { justify-content: center; font-size: 28px; }
    .hero-img { transform: none; margin-bottom: 20px; }
}

/* --- 原有样式保持不变 --- */
.page-header { text-align: center; margin-bottom: 30px; }
.page-header h2 { font-weight: bold; color: #333; margin-bottom: 5px; font-size: 28px; }
.page-header p { color: #666; font-size: 14px; margin-bottom: 0; }
.section-spacer { height: 50px; }
.feature-card {
    background: #fff; padding: 20px; border-radius: 12px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.03); height: 100%;
    display: flex; align-items: flex-start; transition: all 0.3s ease; border: 1px solid transparent;
}
.feature-card:hover { transform: translateY(-3px); box-shadow: 0 8px 20px rgba(0,0,0,0.06); }
.feature-icon-box {
    width: 40px; height: 40px; background: linear-gradient(135deg, #3a8ee6, #2b76d2);
    color: #fff; border-radius: 8px; display: flex; align-items: center; justify-content: center;
    font-size: 18px; margin-right: 12px; flex-shrink: 0;
}
.feature-text h4 { font-size: 16px; font-weight: bold; color: #333; margin-bottom: 5px; }
.feature-text p { font-size: 12px; color: #888; line-height: 1.5; margin-bottom: 0; text-align: justify; }
.nav-pills .nav-link {
    background-color: #fff; color: #666; margin-bottom: 8px; border-radius: 6px;
    padding: 12px 20px; font-weight: 500; transition: all 0.3s; font-size: 14px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.02); display: flex; justify-content: space-between; align-items: center;
}
.nav-pills .nav-link:hover { background-color: #f8f9fa; color: #2b76d2; transform: translateX(-3px); }
.nav-pills .nav-link.active {
    background-color: #2b76d2; color: #fff; box-shadow: 0 4px 10px rgba(43, 118, 210, 0.3);
}
.nav-title { font-size: 16px; font-weight: bold; margin-bottom: 10px; padding-left: 5px; color: #333; }
.tab-content-box {
    background: #fff; border-radius: 8px; overflow: hidden;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05); min-height: auto;
}
.blue-header { background: #2b76d2; color: #fff; padding: 15px 20px; }
.blue-header h3 { font-size: 18px; font-weight: bold; margin: 0; display: flex; align-items: center; }
.blue-header .step-badge { 
    background: #fff; color: #2b76d2; width: 24px; height: 24px; border-radius: 50%; 
    display: inline-flex; align-items: center; justify-content: center; margin-right: 10px; font-size: 14px;
}
.blue-header p { margin: 3px 0 0 0; opacity: 0.9; font-size: 12px; padding-left: 34px; }
.white-body { padding: 20px; }
.price-card-v2 {
    border: 1px solid #eef2f6; border-radius: 8px; padding: 15px 10px;
    text-align: center; background: #fff; transition: all 0.3s; position: relative;
    height: 100%; box-shadow: 0 2px 5px rgba(0,0,0,0.01);
}
.price-card-v2:hover {
    border-color: #2b76d2; transform: translateY(-3px); box-shadow: 0 5px 15px rgba(43, 118, 210, 0.1);
}
.badge-hot {
    position: absolute; top: -8px; right: 5px;
    background: #ff4d4f; color: #fff; font-size: 10px; padding: 2px 6px; border-radius: 10px;
    box-shadow: 0 2px 4px rgba(255, 77, 79, 0.2);
}
.price-val { font-size: 22px; font-weight: bold; color: #2b76d2; font-family: 'Arial', sans-serif; margin-bottom: 5px; }
.price-unit { font-size: 12px; color: #666; font-weight: normal; margin-left: 2px; }
.feature-list { list-style: none; padding: 0; margin-top: 5px; text-align: left; padding-left: 5px; margin-bottom: 0; }
.feature-list li { font-size: 12px; color: #555; margin-bottom: 3px; display: flex; align-items: center; line-height: 1.4; }
.feature-list i { color: #28a745; margin-right: 5px; font-size: 10px; min-width: 12px; } 
.step-list { list-style: none; padding: 0; margin-bottom: 15px; }
.step-list li { margin-bottom: 8px; color: #555; font-size: 13px; display: flex; align-items: flex-start; }
.step-list li i { color: #2b76d2; margin-right: 10px; margin-top: 4px; }
.tip-box { 
    background-color: #ebf5ff; border: 1px solid #d1e7fd; border-radius: 5px; 
    padding: 10px 15px; color: #2b76d2; font-size: 12px; margin-bottom: 15px; 
}
.tip-box strong { display: block; margin-bottom: 3px; }
.scenario-item { padding: 15px; border-radius: 8px; color: #fff; margin-bottom: 15px; display: flex; align-items: center; }
.white-body img { max-height: 400px; width: auto; max-width: 100%; }
.bg-purple { background: linear-gradient(135deg, #a18cd1, #fbc2eb); }
.bg-blue { background: linear-gradient(135deg, #3a8ee6, #2b76d2); }
.bg-green { background: linear-gradient(135deg, #2ecc71, #27ae60); }
@media (max-width: 768px) {
    .feature-card { margin-bottom: 15px; }
    .nav-pills { margin-bottom: 15px; flex-direction: row !important; overflow-x: auto; flex-wrap: nowrap; }
    .nav-pills .nav-link { white-space: nowrap; margin-right: 10px; margin-bottom: 0; padding: 8px 12px; }
    .price-card-v2 { margin-bottom: 15px; }
    .col-6 { padding-left: 5px; padding-right: 5px; }
}

/* =========================================
   新增：无忧包机模板 样式
   ========================================= */

body { background-color: #f5f8fb; font-family: "Microsoft YaHei", sans-serif; }
        
/* =========================================
   Hero Banner 样式
   ========================================= */
.hero-banner {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%); 
    padding: 80px 0;
    color: #fff;
    position: relative;
    overflow: hidden;
}
.hero-banner .hero-img {
    box-shadow: 0 15px 35px rgba(0,0,0,0.3);
    border-radius: 8px;
    transform: perspective(1000px) rotateY(5deg);
    transition: all 0.5s ease;
    max-width: 100%;
    border: 2px solid rgba(255,255,255,0.2);
}
.hero-banner .hero-img:hover {
    transform: perspective(1000px) rotateY(0deg);
}
.hero-content { padding-left: 50px; }
.hero-title { 
    font-size: 38px; font-weight: bold; margin-bottom: 25px; 
    display: flex; align-items: center; text-shadow: 0 2px 4px rgba(0,0,0,0.1);
}
.hero-icon-box {
    width: 50px; height: 50px; background: rgba(255,255,255,0.2);
    border-radius: 50%; display: flex; align-items: center; justify-content: center;
    margin-right: 15px; font-size: 24px;
}
.hero-info p { font-size: 16px; margin-bottom: 12px; opacity: 0.95; letter-spacing: 0.5px; }
.btn-group-custom { margin-top: 35px; }
.hero-btn {
    background-color: #28a745; background-image: linear-gradient(to bottom, #2ecc71, #27ae60);
    color: white; padding: 12px 35px; font-size: 18px; border-radius: 6px; border: none;
    margin-right: 15px; margin-bottom: 15px; transition: all 0.3s;
    display: inline-flex; align-items: center; text-decoration: none;
    font-weight: bold; box-shadow: 0 5px 15px rgba(39, 174, 96, 0.4);
}
.hero-btn i { margin-right: 8px; font-size: 20px; }
.hero-btn:hover {
    transform: translateY(-3px); box-shadow: 0 8px 20px rgba(39, 174, 96, 0.6);
    color: #fff; text-decoration: none; filter: brightness(1.1);
}

/* =========================================
   通用样式
   ========================================= */
.main-content { padding: 80px 0; }
.section-header { margin-bottom: 50px; }
.section-header h2 { font-size: 36px; font-weight: 800; color: #333; margin-bottom: 15px; }
.section-header p { font-size: 16px; color: #666; }

/* =========================================
   核心优势 (Core Features) 样式
   ========================================= */
.feature-card {
    background: #fff; padding: 35px 30px; border-radius: 15px;
    box-shadow: 0 10px 30px rgba(221, 230, 243, 0.6);
    display: flex; align-items: flex-start; transition: all 0.3s ease;
    height: 100%; border: 1px solid transparent;
}
.feature-card:hover {
    transform: translateY(-10px); box-shadow: 0 20px 40px rgba(0, 0, 0, 0.08);
    border-color: #bde0fe;
}
.feature-icon-container {
    flex-shrink: 0; width: 60px; height: 60px;
    background: linear-gradient(135deg, #e0f2ff 0%, #f0f9ff 100%);
    border-radius: 12px; display: flex; align-items: center; justify-content: center;
    margin-right: 25px;
}
.feature-icon-container i { font-size: 28px; color: #4facfe; }
.feature-text h3 { font-size: 20px; font-weight: bold; color: #2c3e50; margin-top: 0; margin-bottom: 12px; }
.feature-text p { font-size: 14px; color: #7f8c8d; line-height: 1.6; margin-bottom: 0; text-align: justify; }

/* =========================================
   产品介绍及教程 组合框架样式 (Tabs)
   ========================================= */
.product-tabs-container { margin-top: 50px; }

/* 右侧导航样式 */
.product-nav-box {
    background: #fff; padding: 20px; border-radius: 10px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.05); position: sticky; top: 20px;
}
.product-nav-title { font-size: 16px; font-weight: bold; margin-bottom: 15px; color: #333; padding-left: 10px; }

.nav-pills .nav-link {
    background-color: #fff; color: #555; margin-bottom: 15px;
    padding: 15px 20px; border-radius: 8px; font-weight: 500;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05); transition: all 0.3s;
    border: 1px solid #eee; text-align: left;
}
.nav-pills .nav-link:hover { background-color: #f8f9fa; transform: translateX(5px); }
.nav-pills .nav-link.active {
    background-color: #0069d9; /* 蓝色高亮 */
    color: #fff; box-shadow: 0 5px 15px rgba(0, 105, 217, 0.3);
    border-color: #0069d9;
}

/* 左侧内容区域样式 */
.tab-content-box {
    background: #fff; border-radius: 10px; overflow: hidden;
    box-shadow: 0 5px 25px rgba(0,0,0,0.08); min-height: 500px;
}

/* 蓝色标题栏 */
.tab-header { background-color: #0069d9; color: #fff; padding: 25px 30px; }
.tab-header h3 { font-size: 20px; font-weight: bold; margin: 0; display: flex; align-items: center; }
.tab-header p { margin: 5px 0 0 0; font-size: 14px; opacity: 0.9; }

/* 教程特有：圆圈序号 */
.tab-header .step-badge {
    background: #fff; color: #0069d9; width: 30px; height: 30px; border-radius: 50%;
    display: inline-flex; align-items: center; justify-content: center; margin-right: 12px; font-size: 16px; font-weight: bold;
}

/* 内容主体 */
.tab-body { padding: 30px; }

/* 价格卡片网格样式 */
.price-grid { display: flex; flex-wrap: wrap; margin: -10px; }
.price-col { width: 25%; padding: 10px; } 

.price-card {
    border: 1px solid #eee; border-radius: 8px; padding: 20px 10px;
    text-align: center; transition: all 0.3s; position: relative;
    background: #fff; height: 100%;
}
.price-card:hover { border-color: #4facfe; box-shadow: 0 5px 15px rgba(79, 172, 254, 0.2); z-index: 2; }
.price-card.recommend { border: 2px solid #0069d9; } 

.badge-recommend {
    position: absolute; top: -10px; right: -10px;
    background: #ff5252; color: #fff; font-size: 12px;
    padding: 3px 8px; border-radius: 4px; box-shadow: 0 2px 5px rgba(0,0,0,0.2);
}

.price-title { font-size: 18px; font-weight: bold; color: #0069d9; margin-bottom: 5px; }
.price-num { font-size: 20px; color: #333; margin-bottom: 15px; font-weight: bold; }
.price-num small { font-size: 12px; color: #888; font-weight: normal; }
.price-features { list-style: none; padding: 0; margin: 0; font-size: 12px; color: #666; text-align: left; padding-left: 10px;}
.price-features li { margin-bottom: 5px; }
.price-features i { color: #28a745; margin-right: 5px; }

/* 截图通用样式 */
.content-screenshot {
    width: 100%; border-radius: 5px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1); border: 1px solid #eee;
}

/* =========================================
   NEW: 教程特有样式 (列表、提示框)
   ========================================= */
.step-list { list-style: none; padding: 0; margin-top: 20px; margin-bottom: 20px; }
.step-list li { margin-bottom: 12px; color: #444; font-size: 15px; display: flex; align-items: flex-start; }
.step-list li i { color: #0069d9; margin-right: 12px; margin-top: 4px; font-size: 18px; }

.tip-box {
    background-color: #f8faff; border-left: 4px solid #0069d9; border-radius: 4px;
    padding: 15px 20px; color: #555; font-size: 14px; margin-top: 20px; margin-bottom: 20px;
}
.tip-box i { color: #0069d9; margin-right: 8px; font-size: 16px; }
.tip-box strong { color: #0069d9; margin-right: 5px; }

/* 手机适配 */
@media (max-width: 992px) {
    .product-tabs-container .row { flex-direction: column-reverse; } 
    .price-col { width: 50%; } 
}
@media (max-width: 768px) {
    .hero-banner { padding: 50px 0; text-align: center; }
    .hero-content { padding-left: 0; margin-top: 40px; }
    .hero-title { justify-content: center; font-size: 30px; }
    .hero-img { transform: none; margin-bottom: 20px; max-width: 90%; }
    .hero-btn { width: 100%; justify-content: center; margin-right: 0; }
    
    .feature-card { flex-direction: column; text-align: center; padding: 25px; }
    .feature-icon-container { margin: 0 auto 20px auto; }
    .feature-text p { text-align: center; }

    .price-col { width: 50%; } 
    .tab-header { padding: 15px; }
    .tab-body { padding: 15px; }
    .product-nav-box { margin-bottom: 30px; position: static; }
}
@media (max-width: 480px) {
    .price-col { width: 100%; } 
}


/* 无忧安卓页面 */
body { background-color: #f5f8fb; font-family: "Microsoft YaHei", sans-serif; }
        
/* ================= Banner 区域样式 ================= */
.hero-banner {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    color: #fff;
    padding: 60px 0;
    position: relative;
    overflow: hidden;
}
.hero-title {
    font-size: 36px;
    font-weight: bold;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
}
.hero-title img {
    width: 50px;
    margin-right: 15px;
    border-radius: 10px;
}
.hero-info p {
    font-size: 16px;
    margin-bottom: 10px;
    opacity: 0.9;
}
.download-box {
    background: #fff;
    border-radius: 10px;
    padding: 20px;
    text-align: center;
    display: inline-block;
    margin-top: 30px;
    color: #333;
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
}
.download-box p {
    font-size: 14px;
    color: #666;
    margin-bottom: 10px;
}
.qr-img {
    width: 120px;
    height: 120px;
    background: #eee;
    margin: 0 auto 15px;
}
.btn-download {
    background-color: #007bff;
    color: #fff;
    border: none;
    padding: 8px 30px;
    border-radius: 20px;
    font-size: 14px;
    width: 100%;
    transition: all 0.3s;
}
.btn-download:hover {
    background-color: #0056b3;
    color: #fff;
}

/* ================= 核心优势区域样式 ================= */
.features-section {
    padding: 60px 0;
}
.section-header {
    text-align: center;
    margin-bottom: 50px;
}
.section-header h2 {
    font-size: 32px;
    font-weight: bold;
    color: #333;
    margin-bottom: 10px;
}
.section-header p {
    color: #777;
}
.feature-card {
    background: #fff;
    border-radius: 15px;
    padding: 30px;
    margin-bottom: 30px;
    display: flex;
    align-items: flex-start;
    transition: transform 0.3s, box-shadow 0.3s;
    border: 1px solid #f0f0f0;
}
.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.05);
}
.feature-icon {
    font-size: 32px;
    color: #2fa7ff;
    margin-right: 20px;
    min-width: 50px;
    text-align: center;
}
.feature-content h4 {
    font-size: 18px;
    font-weight: bold;
    color: #333;
    margin-bottom: 10px;
}
.feature-content p {
    font-size: 14px;
    color: #888;
    line-height: 1.6;
    margin: 0;
}

/* ================= 产品介绍区域样式 (New) ================= */
.intro-section {
    padding: 60px 0;
    background-color: #fff; /* 与教程背景区分，使用白色或保持灰色 */
}
.intro-container-card {
    background: #f5f8fb; /* 内部卡片底色 */
    border-radius: 10px;
    padding: 20px; /* 减少内边距以适应全宽图片 */
    border: 1px solid #eef2f5;
}

/* 蓝色头部块 */
.intro-header-block {
    background-color: #0066ff;
    color: #fff;
    padding: 25px;
    border-radius: 8px;
    margin-bottom: 25px;
}
.intro-header-block h3 {
    font-size: 22px;
    font-weight: bold;
    margin-bottom: 10px;
}
.intro-header-block p {
    margin: 0;
    font-size: 14px;
    opacity: 0.9;
}

/* 价格卡片样式 */
.price-card {
    background: #fff;
    border-radius: 8px;
    padding: 20px;
    text-align: center;
    margin-bottom: 20px;
    position: relative;
    box-shadow: 0 2px 10px rgba(0,0,0,0.03);
    border: 1px solid #eee;
    transition: all 0.3s;
}
.price-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.08);
    border-color: #0066ff;
}
.tag-special {
    position: absolute;
    top: -10px;
    right: 10px;
    background: #ff4d4f;
    color: #fff;
    font-size: 12px;
    padding: 2px 8px;
    border-radius: 4px;
}
.price-text {
    color: #0066ff;
    font-size: 24px;
    font-weight: bold;
    margin-bottom: 5px;
}
.price-desc {
    font-size: 12px;
    color: #999;
    margin-bottom: 15px;
}
.price-features {
    list-style: none;
    padding: 0;
    text-align: left;
    font-size: 13px;
    color: #666;
}
.price-features li {
    margin-bottom: 6px;
    padding-left: 20px;
    position: relative;
}
.price-features li::before {
    content: "\f00c";
    font-family: FontAwesome;
    color: #52c41a;
    position: absolute;
    left: 0;
}

/* 场景卡片样式 */
.scenario-item {
    display: flex;
    background: #fff;
    border-radius: 8px;
    overflow: hidden;
    margin-bottom: 20px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.03);
}
.scenario-icon-box {
    width: 120px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 40px;
    flex-shrink: 0;
}
.scenario-content {
    padding: 20px;
    flex-grow: 1;
}
.scenario-content h4 {
    font-weight: bold;
    margin-bottom: 10px;
    font-size: 18px;
}
.scenario-content p {
    font-size: 13px;
    color: #666;
    line-height: 1.6;
    margin-bottom: 10px;
}
.scenario-tags span {
    display: inline-block;
    background: #f0f2f5;
    color: #666;
    font-size: 12px;
    padding: 3px 10px;
    border-radius: 20px;
    margin-right: 5px;
    margin-bottom: 5px;
}
/* 场景颜色 */
.bg-purple { background: linear-gradient(135deg, #a18cd1 0%, #fbc2eb 100%); }
.bg-blue { background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%); }
.bg-green { background: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%); }

/* 通用图片容器 */
.intro-img-full {
    width: 100%;
    border-radius: 0 0 8px 8px;
    display: block;
}

/* 底部导航按钮 */
.intro-footer-nav {
    display: flex;
    justify-content: space-between;
    margin-top: 20px;
}
.btn-next-step {
    background: #0066ff;
    color: #fff;
    padding: 8px 20px;
    border-radius: 5px;
    font-size: 14px;
    border: none;
    cursor: pointer;
    transition: 0.3s;
}
.btn-next-step:hover { background: #0052cc; color: #fff; }
.btn-prev-step {
    background: #e4e7ed;
    color: #666;
    padding: 8px 20px;
    border-radius: 5px;
    font-size: 14px;
    border: none;
    cursor: pointer;
    transition: 0.3s;
}
.btn-prev-step:hover { background: #dcdfe6; }


/* ================= 使用教程区域样式 ================= */
.tutorial-section {
    padding: 60px 0;
    background-color: #f5f8fb; /* 保持统一背景 */
}
.tutorial-title {
    text-align: center;
    margin-bottom: 40px;
}
.tutorial-title h2 {
    font-weight: bold;
    color: #333;
    font-size: 32px;
}
.tutorial-title p {
    color: #666;
    margin-top: 10px;
}

/* 左侧卡片 */
.tutorial-card {
    background: #fff;
    border-radius: 10px;
    padding: 40px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
    border: 1px solid #eef2f5;
    position: relative;
    min-height: 600px;
}

/* 步骤标题 */
.step-header {
    display: flex;
    align-items: center;
    margin-bottom: 20px;
}
.step-badge {
    width: 32px;
    height: 32px;
    background-color: #0066ff;
    color: #fff;
    border-radius: 50%;
    text-align: center;
    line-height: 32px;
    font-weight: bold;
    margin-right: 15px;
    flex-shrink: 0;
}
.step-title {
    font-size: 20px;
    font-weight: bold;
    color: #333;
    margin: 0;
}

/* 文本与列表 */
.step-desc {
    color: #555;
    line-height: 1.8;
    margin-bottom: 20px;
}
.step-list {
    list-style: none;
    padding: 0;
    margin-bottom: 30px;
}
.step-list li {
    position: relative;
    padding-left: 25px;
    margin-bottom: 10px;
    color: #444;
}
.step-list li::before {
    content: "\f058"; /* FontAwesome check-circle */
    font-family: FontAwesome;
    color: #0066ff;
    position: absolute;
    left: 0;
    top: 2px;
}

/* 图片容器 */
.tutorial-img-box {
    text-align: center;
    margin-top: 30px;
    background: #f0f4f8;
    padding: 20px;
    border-radius: 8px;
}
.tutorial-img-box img {
    max-width: 100%;
    border-radius: 5px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

/* 右侧导航菜单 (通用) */
.side-nav-card {
    background: #fff;
    border-radius: 10px;
    padding: 20px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
    position: sticky;
    top: 20px;
}
.nav-header {
    font-weight: bold;
    margin-bottom: 15px;
    padding-left: 10px;
}
.nav-pills-custom .nav-link {
    color: #555;
    background-color: #fff;
    margin-bottom: 10px;
    border-radius: 5px;
    border: 1px solid transparent;
    padding: 12px 15px;
    transition: all 0.3s;
}
.nav-pills-custom .nav-link:hover {
    background-color: #f8f9fa;
}
.nav-pills-custom .nav-link.active {
    background-color: #0066ff;
    color: #fff;
    box-shadow: 0 4px 10px rgba(0, 102, 255, 0.3);
}

/* 翻页按钮 */
.nav-arrows {
    display: flex;
    justify-content: space-between;
    margin-top: 20px;
}
.btn-circle-nav {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: #fff;
    border: 1px solid #eee;
    color: #0066ff;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
    transition: all 0.3s;
}
.btn-circle-nav:hover {
    background: #0066ff;
    color: #fff;
}



/* 无忧socks5模板 */
/* ================= 全局与基础样式 ================= */
body { background-color: #f5f8fb; font-family: "Microsoft YaHei", sans-serif; color: #333; }
ul { list-style: none; padding: 0; margin: 0; }

/* ================= 1. 核心Banner区域 ================= */
.hero-section {
    background: linear-gradient(135deg, #4b6cb7 0%, #182848 100%);
    background: url('../images/banner-bg.jpg') no-repeat center center / cover, linear-gradient(to right, #4facfe 0%, #00f2fe 100%);
    padding: 80px 0;
    color: #fff;
    overflow: hidden;
}

.device-showcase {
    position: relative;
    height: 450px;
    display: flex;
    align-items: center;
}

.pc-screen {
    width: 85%;
    position: absolute;
    left: 0;
    top: 20px;
    z-index: 1;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
    border-radius: 8px;
}

.mobile-screen {
    width: 35%;
    position: absolute;
    left: 20%;
    top: 50px;
    z-index: 2;
    box-shadow: 0 15px 35px rgba(0,0,0,0.4);
    border-radius: 20px;
}

.product-intro { padding-left: 30px; padding-top: 20px; }
.product-header { display: flex; align-items: center; margin-bottom: 25px; }
.product-logo { width: 60px; height: 60px; margin-right: 15px; border-radius: 50%; background: rgba(255,255,255,0.2); padding: 5px; }
.product-title { font-size: 36px; font-weight: bold; margin: 0; }
.product-specs { margin-bottom: 40px; font-size: 16px; line-height: 2; opacity: 0.9; }
.product-specs span { display: block; }
.spec-label { font-weight: bold; margin-right: 5px; }

.btn-download {
    display: block;
    width: 240px;
    padding: 12px 20px;
    margin-bottom: 15px;
    background: linear-gradient(to bottom, #2ecc71, #27ae60);
    border: 1px solid #27ae60;
    color: white;
    font-size: 20px;
    border-radius: 5px;
    text-align: center;
    text-decoration: none;
    transition: all 0.3s;
    box-shadow: 0 4px 6px rgba(0,0,0,0.2);
}
.btn-download:hover { background: linear-gradient(to bottom, #27ae60, #219150); color: #fff; transform: translateY(-2px); text-decoration: none; }
.btn-download i { margin-right: 10px; }

@media (max-width: 991px) {
    .hero-section { text-align: center; }
    .device-showcase { height: auto; margin-bottom: 50px; justify-content: center; }
    .pc-screen { position: relative; left: auto; top: auto; width: 90%; }
    .mobile-screen { display: none; }
    .product-header { justify-content: center; }
    .btn-download { margin: 10px auto; }
}

/* ================= 2. 核心优势区域 ================= */
.feature-section { padding: 60px 0 30px; }
.feature-title { text-align: center; font-size: 32px; font-weight: bold; color: #333; margin-bottom: 50px; }

.feature-card {
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.05);
    padding: 30px;
    margin-bottom: 30px;
    display: flex;
    align-items: flex-start;
}
.feature-icon-wrapper {
    flex-shrink: 0; width: 60px; height: 60px; background: rgba(53, 137, 240, 0.1); border-radius: 50%;
    display: flex; justify-content: center; align-items: center; margin-right: 20px;
}
.feature-icon { font-size: 24px; color: #3589f0; }
.feature-card-title { font-size: 18px; font-weight: bold; margin-bottom: 8px; margin-top: 0; }
.feature-card-desc { font-size: 14px; color: #777; margin-bottom: 0; line-height: 1.6; }

@media (max-width: 575px) {
    .feature-card { flex-direction: column; align-items: center; text-align: center; }
    .feature-icon-wrapper { margin-right: 0; margin-bottom: 15px; }
}

/* ================= 3. 通用内容样式 (产品介绍 & 教程) ================= */
.product-details-section, .tutorial-section { padding-bottom: 60px; }
.section-main-title { text-align: center; font-size: 32px; font-weight: bold; margin-bottom: 40px; color: #333; }

/* 导航卡片通用样式 */
.details-nav-card {
    background: #fff;
    border-radius: 8px;
    padding: 20px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
    position: sticky;
    top: 20px;
}
.nav-title { font-weight: bold; margin-bottom: 15px; border-bottom: 1px solid #eee; padding-bottom: 10px; }

/* 导航按钮通用样式 */
.details-nav-item, .tutorial-nav-item, .android-nav-item {
    display: block;
    width: 100%;
    text-align: left;
    padding: 12px 15px;
    margin-bottom: 10px;
    border-radius: 6px;
    color: #666;
    background: #f9f9f9;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.2s;
    border: none;
    outline: none;
}
.details-nav-item:hover, .tutorial-nav-item:hover, .android-nav-item:hover { background: #eef4ff; color: #3589f0; }

/* 选中状态 */
.details-nav-item.active, .tutorial-nav-item.active, .android-nav-item.active {
    background: #3589f0;
    color: #fff;
    box-shadow: 0 4px 10px rgba(53, 137, 240, 0.3);
    font-weight: bold;
}

/* 内容面板通用样式 */
.content-panel, .tutorial-panel, .android-panel {
    background: #fff;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 5px 20px rgba(0,0,0,0.05);
    display: none; /* 默认隐藏 */
    animation: fadeIn 0.4s ease;
}
.content-panel.active, .tutorial-panel.active, .android-panel.active { display: block; }

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* 蓝色头部 */
.panel-header {
    background: #1a56ff;
    color: #fff;
    padding: 20px 30px;
}
.panel-title { font-size: 20px; font-weight: bold; margin: 0; }
.panel-subtitle { font-size: 14px; opacity: 0.9; margin-top: 5px; }

/* 步骤序号 */
.step-badge {
    display: inline-block;
    width: 24px;
    height: 24px;
    line-height: 24px;
    text-align: center;
    background: #fff;
    color: #1a56ff;
    border-radius: 50%;
    font-size: 14px;
    font-weight: bold;
    margin-right: 8px;
}

.panel-body { padding: 30px; }

/* --- 价格卡片样式 --- */
.price-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}
.price-card {
    border: 1px solid #eee;
    border-radius: 8px;
    padding: 20px 15px;
    text-align: center;
    position: relative;
    transition: transform 0.2s, box-shadow 0.2s;
    background: #fff;
}
.price-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.08);
    border-color: #b3d7ff;
}
.badge-special {
    position: absolute; top: -1px; right: 10px; background: #ff4757; color: #fff; font-size: 12px; padding: 2px 6px; border-radius: 0 0 4px 4px;
}
.price-amount { font-size: 28px; font-weight: bold; color: #3589f0; margin-bottom: 15px; }
.price-amount small { font-size: 16px; color: #666; font-weight: normal; margin-left: 2px; }

.feature-list { font-size: 13px; color: #555; text-align: left; padding-left: 5px; }
.feature-list li { margin-bottom: 8px; display: flex; align-items: center; }
.feature-list i { color: #2ecc71; margin-right: 8px; width: 14px; }

/* --- 地区/教程 图片容器样式 --- */
.region-img-container, .tutorial-img-container { width: 100%; border-radius: 8px; overflow: hidden; text-align: center;}
.region-img-container img { max-width: 100%; height: auto; display: inline-block; border: 1px solid #eee; border-radius: 8px; }

/* 教程文本样式 */
.tutorial-desc { margin-bottom: 20px; font-size: 15px; line-height: 1.8; color: #555; }
.tutorial-desc i { color: #1a56ff; margin-right: 5px; }

/* 底部切换按钮 */
.panel-footer-nav {
    padding: 20px 30px;
    background: #f9fbff;
    border-top: 1px solid #eee;
    display: flex;
    justify-content: space-between;
}
.btn-nav-switch {
    background: #3589f0; color: #fff; border: none; padding: 8px 20px; border-radius: 4px; font-size: 14px; cursor: pointer; text-decoration: none;
}
.btn-nav-switch:hover { background: #1a6df0; color: #fff; text-decoration: none; }

/* 响应式适配 */
@media (max-width: 991px) {
    .price-grid { grid-template-columns: repeat(2, 1fr); }
    .details-nav-card { margin-bottom: 30px; position: static; }
}
@media (max-width: 575px) {
    .price-grid { grid-template-columns: 1fr; }
    .hero-section { padding: 50px 0; }
}