/* WhatsApp官网主色调 */
:root {
    --wa-green: #25D366;
    --wa-dark: #075E54;
    --wa-light: #DCF8C6;
    --wa-bg: #f4fdf6;
    --wa-gray: #ece5dd;
}

/* 通用设置 */
body {
    margin: 0;
    font-family: 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Arial', sans-serif;
    background: var(--wa-bg);
    color: #222;
    min-height: 100vh;
}
.zc2e4bcontainer {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
}

/* 导航栏 */
.zc2e4bnavbar {
    background: var(--wa-dark);
    color: #fff;
    padding: 0.8rem 0;
    box-shadow: 0 2px 8px rgba(7,94,84,0.08);
    position: sticky;
    top: 0;
    z-index: 100;
}
.zc2e4bnav-container {
    display: flex;
    align-items: center;
    justify-content: flex-start;
}
.zc2e4bsite-title {
    font-size: 1.6rem;
    font-weight: bold;
    letter-spacing: 2px;
    color: #fff;
}

.zc2e4bnav-menu {
    display: flex;
    gap: 1.5rem;
    margin-left: 2.5rem;
    list-style: none;
    padding: 0;
    align-items: center;
}
.zc2e4bnav-menu li {
    display: inline-block;
}
.zc2e4bnav-menu a {
    color: #fff;
    font-size: 1rem;
    text-decoration: none;
    padding: 0.3rem 1rem;
    border-radius: 1.2rem;
    transition: background 0.18s, color 0.18s;
    font-weight: 500;
}
.zc2e4bnav-menu a:hover, .zc2e4bnav-menu a:focus {
    background: var(--wa-green);
    color: var(--wa-dark);
}

/* 主横幅 */
.zc2e4bmain-banner {
    background: linear-gradient(120deg, var(--wa-dark) 60%, var(--wa-green) 100%);
    color: #fff;
    padding: 3rem 0 2.5rem 0;
    text-align: center;
    border-radius: 0 0 2rem 2rem;
    box-shadow: 0 4px 24px rgba(7,94,84,0.10);
    margin-bottom: 2rem;
}
.zc2e4bbanner-content h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    letter-spacing: 1px;
}
.zc2e4bbanner-content p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
}
.zc2e4bbanner-btns {
    display: flex;
    gap: 1.2rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 1rem;
}
.zc2e4bbtn-primary {
    background: #fff;
    color: var(--wa-dark);
    padding: 0.8rem 2.2rem;
    border-radius: 2rem;
    font-size: 1.1rem;
    font-weight: bold;
    text-decoration: none;
    box-shadow: 0 2px 8px rgba(37,211,102,0.10);
    transition: background 0.2s, color 0.2s;
    border: 2px solid var(--wa-green);
    cursor: pointer;
}
.zc2e4bbtn-primary:hover {
    background: var(--wa-green);
    color: #fff;
    border-color: var(--wa-dark);
}

/* 板块通用 */
.zc2e4bsection {
    margin-bottom: 2.5rem;
    padding-top: 2.5rem;
    padding-bottom: 2.5rem;
    position: relative;
}
.zc2e4bsection:nth-child(even) {
    background: var(--wa-gray);
}
.zc2e4bsection:nth-child(odd) {
    background: #fff;
}
.zc2e4bsection:not(:first-child)::before {
    content: '';
    display: block;
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80%;
    height: 4px;
    background: linear-gradient(90deg, var(--wa-green) 0%, var(--wa-dark) 100%);
    border-radius: 2px;
    opacity: 0.12;
}

/* 板块内容容器微调 */
.zc2e4bsection > .zc2e4bcontainer {
    position: relative;
    z-index: 1;
}

.zc2e4bcards {
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
    justify-content: center;
}
.zc2e4bcard {
    background: #fff;
    border-radius: 1.2rem;
    box-shadow: 0 2px 12px rgba(37,99,235,0.08);
    padding: 2rem 1.5rem;
    flex: 1 1 260px;
    min-width: 240px;
    max-width: 340px;
    margin: 0.5rem 0;
    transition: transform 0.18s, box-shadow 0.18s;
    position: relative;
    overflow: hidden;
}
.zc2e4bcard:hover {
    transform: translateY(-6px) scale(1.03);
    box-shadow: 0 8px 24px rgba(37,99,235,0.13);
}
.zc2e4bcard h2, .zc2e4bcard h3 {
    margin-top: 0;
    color: var(--wa-dark);
}

/* 下载按钮 */
.zc2e4bbtn-secondary {
    display: inline-block;
    background: var(--wa-green);
    color: #fff;
    padding: 0.6rem 1.6rem;
    border-radius: 1.5rem;
    font-size: 1rem;
    font-weight: 500;
    text-decoration: none;
    margin-top: 1rem;
    box-shadow: 0 2px 8px rgba(37,99,235,0.10);
    transition: background 0.2s, color 0.2s;
    border: 2px solid var(--wa-dark);
    cursor: pointer;
}
.zc2e4bbtn-secondary:hover {
    background: var(--wa-dark);
    color: #fff;
    border-color: var(--wa-green);
}

/* FAQ样式 */
.zc2e4bfaq-list {
    margin-top: 1.5rem;
}
.zc2e4bfaq-item {
    background: #f1f5f9;
    border-radius: 1rem;
    margin-bottom: 1.2rem;
    padding: 1.2rem 1rem;
    box-shadow: 0 1px 4px rgba(37,99,235,0.05);
}
.zc2e4bfaq-item h4 {
    margin: 0 0 0.5rem 0;
    color: #2563eb;
}

/* 页脚 */
.zc2e4bfooter {
    background: var(--wa-dark);
    color: #fff;
    text-align: center;
    padding: 1.2rem 0;
    border-radius: 2rem 2rem 0 0;
    margin-top: 2rem;
    font-size: 1rem;
    box-shadow: 0 -2px 12px rgba(37,99,235,0.08);
}

/* 新闻资讯/更新日志板块 */
.zc2e4bnews-section .zc2e4bcard h3 {
    font-size: 1.1rem;
    color: #2563eb;
    margin-bottom: 0.5rem;
}

/* 使用教程/操作指引板块 */
.zc2e4bguide-section ol {
    padding-left: 1.2rem;
    margin: 0.5rem 0 0 0;
}
.zc2e4bguide-section li {
    margin-bottom: 0.3rem;
    font-size: 1rem;
}

/* 安全与隐私专栏 */
.zc2e4bsecurity-section .zc2e4bcard h3 {
    font-size: 1.1rem;
    color: #2563eb;
}

/* 用户评价/真实反馈 */
.zc2e4breviews-section .zc2e4bcard {
    background: linear-gradient(120deg, #f1f5f9 60%, #e0e7ff 100%);
    font-style: italic;
    font-size: 1.05rem;
    color: #374151;
    position: relative;
}
.zc2e4breviews-section .zc2e4bcard span {
    display: block;
    font-style: normal;
    font-size: 0.95rem;
    color: var(--wa-green);
    margin-top: 0.5rem;
}

/* 对比分析板块 */
.zc2e4bcompare-section ul {
    padding-left: 1.2rem;
    margin: 0.5rem 0 0 0;
}
.zc2e4bcompare-section li {
    margin-bottom: 0.3rem;
    font-size: 1rem;
}

/* 联系我们/意见反馈表单 */
.zc2e4bcontact-form {
    background: #fff;
    border-radius: 1.2rem;
    box-shadow: 0 2px 12px rgba(37,99,235,0.08);
    padding: 2rem 1.5rem;
    max-width: 480px;
    margin: 1.5rem auto 0 auto;
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
}
.zc2e4bform-group {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}
.zc2e4bcontact-form label {
    font-weight: 500;
    color: var(--wa-dark);
}
.zc2e4bcontact-form input,
.zc2e4bcontact-form textarea {
    border: 1px solid #cbd5e1;
    border-radius: 0.6rem;
    padding: 0.6rem;
    font-size: 1rem;
    outline: none;
    transition: border 0.2s;
    background: #f8fafc;
}
.zc2e4bcontact-form input:focus,
.zc2e4bcontact-form textarea:focus {
    border: 1.5px solid var(--wa-green);
    background: #fff;
}
.zc2e4bcontact-form .zc2e4bbtn-primary {
    align-self: flex-start;
    margin-top: 0.5rem;
}

/* 板块标题美化 */
.zc2e4bsection > .zc2e4bcontainer > h2 {
    font-size: 1.6rem;
    color: var(--wa-dark);
    margin-bottom: 1.2rem;
    letter-spacing: 1px;
    border-left: 5px solid var(--wa-green);
    padding-left: 0.7rem;
    background: linear-gradient(90deg, var(--wa-light) 60%, #fff 100%);
    border-radius: 0.5rem;
    display: block;
    width: 100%;
}

/* 响应式设计 */
@media (max-width: 900px) {
    .zc2e4bcards {
        flex-direction: column;
        align-items: center;
    }
    .zc2e4bmain-banner {
        padding: 2.2rem 0 1.5rem 0;
    }
    .zc2e4bbanner-content h1 {
        font-size: 2rem;
    }
    .zc2e4bcontact-form {
        padding: 1.2rem 0.5rem;
    }
    .zc2e4bnav-menu {
        gap: 0.7rem;
        margin-left: 1rem;
    }
    .zc2e4bnav-menu a {
        font-size: 0.95rem;
        padding: 0.2rem 0.7rem;
    }
}
@media (max-width: 600px) {
    .zc2e4bcontainer {
        width: 98%;
        padding: 0 0.5rem;
    }
    .zc2e4bmain-banner {
        border-radius: 0 0 1.2rem 1.2rem;
    }
    .zc2e4bfooter {
        border-radius: 1.2rem 1.2rem 0 0;
    }
    .zc2e4bcard {
        padding: 1.2rem 0.8rem;
    }
    .zc2e4bsite-title {
        font-size: 1.1rem;
    }
    .zc2e4bcontact-form {
        padding: 0.8rem 0.2rem;
    }
    .zc2e4bsection > .zc2e4bcontainer > h2 {
        font-size: 1.2rem;
        padding-left: 0;
    }
    .zc2e4bbanner-btns {
        flex-direction: column;
        gap: 0.7rem;
        align-items: center;
    }
    .zc2e4bnav-container {
        flex-direction: row;
        align-items: center;
        gap: 0.5rem;
    }
    .zc2e4bnav-menu {
        display: none;
        position: absolute;
        top: 56px;
        left: 0;
        width: 100vw;
        background: var(--wa-dark);
        flex-direction: column;
        gap: 0;
        z-index: 999;
        box-shadow: 0 4px 16px rgba(7,94,84,0.10);
        border-radius: 0 0 1.2rem 1.2rem;
    }
    .zc2e4bnav-menu.zc2e4bshow {
        display: flex;
        animation: fadeInMenu 0.25s;
    }
    .zc2e4bnav-menu li {
        width: 100%;
        text-align: left;
        border-bottom: 1px solid rgba(255,255,255,0.08);
    }
    .zc2e4bnav-menu a {
        display: block;
        width: 100%;
        padding: 1rem 1.5rem;
        font-size: 1.1rem;
        color: #fff;
        background: none;
        border-radius: 0;
    }
    .zc2e4bnav-menu a:hover, .zc2e4bnav-menu a:focus {
        background: var(--wa-green);
        color: var(--wa-dark);
    }
    .zc2e4bhamburger {
        display: flex;
    }
    .zc2e4bmain-banner .zc2e4bbanner-content {
        flex-direction: column !important;
        align-items: center !important;
        gap: 1.2rem !important;
    }
    .zc2e4bbanner-img {
        margin-top: 0.5rem;
        justify-content: center !important;
        align-items: center !important;
        width: 100%;
    }
    .zc2e4bbanner-text {
        width: 100%;
    }
    .zc2e4bdownload-section .zc2e4bcard {
        max-width: 90vw;
        min-width: 0;
        width: 100%;
        padding: 2.2rem 1rem;
        min-height: 320px;
    }
}
@keyframes fadeInMenu {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}
/* 美化元素：渐变、圆角、阴影、悬浮动画等已集成 */ 

/* 汉堡菜单按钮样式 */
.zc2e4bhamburger {
    display: none;
    width: 38px;
    height: 38px;
    background: none;
    border: none;
    outline: none;
    cursor: pointer;
    align-items: center;
    justify-content: center;
    margin-left: auto;
}
.zc2e4bhamburger span,
.zc2e4bhamburger span:before,
.zc2e4bhamburger span:after {
    display: block;
    background: #fff;
    height: 4px;
    width: 28px;
    border-radius: 2px;
    position: relative;
    transition: all 0.3s;
}
.zc2e4bhamburger span:before,
.zc2e4bhamburger span:after {
    content: '';
    position: absolute;
    left: 0;
}
.zc2e4bhamburger span:before { top: -9px; }
.zc2e4bhamburger span:after { top: 9px; }

@media (max-width: 600px) {
    .zc2e4bnav-container {
        flex-direction: row;
        align-items: center;
        gap: 0.5rem;
    }
    .zc2e4bnav-menu {
        display: none;
        position: absolute;
        top: 56px;
        left: 0;
        width: 100vw;
        background: var(--wa-dark);
        flex-direction: column;
        gap: 0;
        z-index: 999;
        box-shadow: 0 4px 16px rgba(7,94,84,0.10);
        border-radius: 0 0 1.2rem 1.2rem;
    }
    .zc2e4bnav-menu.zc2e4bshow {
        display: flex;
        animation: fadeInMenu 0.25s;
    }
    .zc2e4bnav-menu li {
        width: 100%;
        text-align: left;
        border-bottom: 1px solid rgba(255,255,255,0.08);
    }
    .zc2e4bnav-menu a {
        display: block;
        width: 100%;
        padding: 1rem 1.5rem;
        font-size: 1.1rem;
        color: #fff;
        background: none;
        border-radius: 0;
    }
    .zc2e4bnav-menu a:hover, .zc2e4bnav-menu a:focus {
        background: var(--wa-green);
        color: var(--wa-dark);
    }
    .zc2e4bhamburger {
        display: flex;
    }
}
@keyframes fadeInMenu {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
} 

.zc2e4bdownload-section .zc2e4bcard {
    max-width: 420px;
    min-width: 260px;
    width: 100%;
}
@media (max-width: 600px) {
    .zc2e4bdownload-section .zc2e4bcard {
        max-width: 90vw;
        min-width: 0;
        width: 100%;
        padding: 2.2rem 1rem;
        min-height: 320px;
    }
}