/* ===================================================
   menu.css — 暗色主题 响应式菜单导航样式
   =================================================== */

/* ===== 暗色变量 ===== */
:root {
    --bg-body: #0d1117;
    --bg-card: #161b22;
    --bg-card-hover: #1c2333;
    --bg-elevated: #1a1f2e;
    --bg-nav: #0d1117;
    --bg-nav-hover: #161b22;
    --bg-submenu: #1c2333;
    --bg-submenu-mobile: #1a1f2e;
    --bg-badge: #e74c3c;
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --text-muted: #484f58;
    --border-color: #21262d;
    --border-light: rgba(255,255,255,0.06);
    --accent: #e74c3c;
    --accent-hover: #c0392b;
    --green: #25D366;
    --blue: #58a6ff;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.4);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.5);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.6);
    --radius: 8px;
    --radius-sm: 6px;
}

/* ===== 重置 ===== */
* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: "Microsoft YaHei", "PingFang SC", -apple-system, sans-serif;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    overflow-y: scroll;
    padding-top: 50px;
    background-color: var(--bg-body);
    color: var(--text-primary);
    line-height: 1.6;
}

/* ===== 导航栏 ===== */
.nav-bar {
    width: 100%;
    background-color: var(--bg-nav);
    border-bottom: 1px solid var(--border-color);
    min-height: 50px;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 1000;
}

.nav-inner {
    max-width: 1024px;
    min-height: 50px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    padding: 0 8px;
}

/* ===== 菜单组 ===== */
.menu-group {
    position: relative;
    height: 50px;
}

.menu-group:hover .main-menu {
    background-color: var(--bg-submenu);
}

/* ===== 主菜单项 ===== */
.main-menu {
    height: 50px;
    display: flex;
    align-items: center;
    padding: 0 18px;
    color: #9aa4b8;
    font-size: 14px;
    cursor: pointer;
    transition: background-color 0.2s, color 0.2s;
    user-select: none;
    white-space: nowrap;
    letter-spacing: 0.3px;
}

.main-menu:hover {
    color: #d0d7e6;
}

.main-menu::before {
    content: "\25B8";
    margin-right: 6px;
    font-size: 11px;
    color: var(--text-muted);
    transition: transform 0.25s, color 0.2s;
}
.main-menu:hover::before {
    transform: rotate(90deg);
    color: var(--accent);
}

/* ===== 子菜单容器 ===== */
.sub-menu {
    position: absolute;
    top: 100%;
    right: 0;
    background-color: var(--bg-submenu);
    border: 1px solid var(--border-color);
    min-width: 200px;
    box-shadow: var(--shadow-lg);
    border-radius: 0 0 var(--radius) var(--radius);
    display: none;
    z-index: 999;
    overflow: hidden;
}

/* ===== 子菜单项 ===== */
.sub-item {
    padding: 10px 20px;
    color: var(--text-secondary);
    font-size: 13px;
    cursor: pointer;
    transition: background-color 0.18s, padding-left 0.18s, color 0.18s;
    border-bottom: 1px solid #272e40;
}
.sub-item:last-child { border-bottom: none; }
.sub-item:hover {
    background-color: var(--bg-card-hover);
    padding-left: 26px;
    color: #fff;
}

/* ===== 正文区域 ===== */
.content-area,
.page-content {
    max-width: 1024px;
    margin: 0 auto;
    padding: 40px 20px;
    color: var(--text-primary);
    flex: 1;
}

.content-area h3 {
    font-size: 22px;
    border-left: 4px solid var(--accent);
    padding-left: 14px;
    margin-top: 36px;
    margin-bottom: 18px;
    color: #fff;
}

.content-area p {
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

/* ===== 汉堡按钮 ===== */
.hamburger {
    display: none;
    width: 40px;
    height: 40px;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    background: none;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 0;
    margin: 5px 0;
    transition: border-color 0.2s;
}
.hamburger:hover { border-color: var(--text-muted); }
.hamburger span {
    display: block;
    width: 20px;
    height: 2px;
    background-color: var(--text-primary);
    margin: 3px 0;
    border-radius: 2px;
    transition: 0.3s;
}
.hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* =================================================
   公司 Logo
   ================================================= */

.nav-logo {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    margin-right: 10px;
    text-decoration: none;
    opacity: 0.92;
    transition: opacity 0.2s;
}
.nav-logo:hover { opacity: 1; }

.nav-logo img {
    height: 36px;
    width: auto;
    display: block;
    border-radius: 4px;
}

/* 公司名称图片 */
.nav-company-name {
    height: 36px;
    width: auto;
    display: block;
    margin-right: 10px;
    flex-shrink: 0;
    opacity: 0.9;
}

/* =================================================
   桌面端
   ================================================= */
@media (min-width: 768px) {
    #menuContainer {
        display: flex !important;
        align-items: center;
        height: 50px;
        margin-left: auto;
        padding-right: 4px;
    }
    .hamburger { display: none !important; }
}

/* =================================================
   手机端
   ================================================= */
@media (max-width: 767px) {
    .nav-bar {
        height: 50px;
        min-height: 50px;
        position: fixed;
    }

    .nav-inner {
        height: 50px;
        min-height: 50px;
        flex-wrap: nowrap;
    }

    .hamburger { display: flex; }

    .nav-logo { margin-right: auto; }
    .nav-logo img { height: 30px; width: auto; }

    .nav-company-name {
        height: 30px;
        width: auto;
        position: absolute;
        left: 50%;
        transform: translateX(-50%);
    }

    #menuContainer {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        flex-direction: column;
        background-color: var(--bg-elevated);
        border: 1px solid var(--border-color);
        border-top: none;
        box-shadow: var(--shadow-lg);
        border-radius: 0 0 var(--radius) var(--radius);
        z-index: 9999;
    }
    #menuContainer.open { display: flex; }

    .menu-group {
        position: static;
        height: auto;
        display: flex;
        flex-direction: column;
        width: 100%;
    }

    .main-menu {
        width: 100%;
        height: auto;
        min-height: 44px;
        padding: 0 16px;
        border-bottom: 1px solid var(--border-color);
        white-space: normal;
    }
    .main-menu:last-child { border-bottom: none; }
    .main-menu:hover { background-color: var(--bg-card-hover); }

    .main-menu::before {
        content: "\25BE";
        margin-right: 8px;
        font-size: 13px;
    }
    .main-menu:hover::before { transform: none; }

    .main-menu.active {
        background-color: #42577a;
        border-bottom-color: #1a2332;
    }
    .main-menu.active::before {
        content: "\25B4";
    }

    .sub-menu {
        position: static;
        box-shadow: none;
        border-radius: 0;
        border: none;
        border-top: 1px solid var(--border-color);
        background-color: #2b3c55;
        min-width: 100%;
    }
    .sub-item {
        color: var(--text-secondary);
        padding: 10px 16px 10px 44px;
        border-bottom: 1px solid var(--border-color);
    }
    .sub-item:hover {
        color: #fff;
        background-color: #354763;
        padding-left: 48px;
    }
}

/* =================================================
   极小屏
   ================================================= */
@media (max-width: 399px) {
    .main-menu { padding: 0 10px; font-size: 13px; }
    .sub-item { padding: 9px 12px 9px 30px; font-size: 12px; }
}

/* ===================================================
   品牌轮播图
   =================================================== */

.brand-carousel {
    position: relative;
    max-width: 1024px;
    margin: 0 auto;
    overflow: hidden;
    border-radius: 0 0 var(--radius) var(--radius);
}
.carousel-wrapper { display: flex; transition: transform 0.5s ease; }
.carousel-wrapper img {
    width: 100%;
    flex-shrink: 0;
    display: block;
    height: 400px;
    object-fit: cover;
}
.carousel-arrow {
    position: absolute; top: 50%; transform: translateY(-50%);
    width: 40px; height: 40px;
    background-color: rgba(0,0,0,0.5);
    color: #fff;
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 50%;
    font-size: 18px;
    cursor: pointer; z-index: 10;
    transition: background-color 0.25s, border-color 0.25s;
    display: flex; align-items: center; justify-content: center;
    backdrop-filter: blur(4px);
}
.carousel-arrow:hover { background-color: rgba(0,0,0,0.75); border-color: rgba(255,255,255,0.25); }
.carousel-prev { left: 12px; }
.carousel-next { right: 12px; }
.carousel-dots {
    position: absolute; bottom: 14px; left: 50%; transform: translateX(-50%);
    display: flex; gap: 8px; z-index: 10;
}
.carousel-dots span {
    width: 10px; height: 10px;
    border-radius: 50%;
    background-color: rgba(255,255,255,0.35);
    cursor: pointer;
    transition: background-color 0.25s, transform 0.2s;
    border: 1px solid rgba(0,0,0,0.2);
}
.carousel-dots span.active { background-color: var(--accent); transform: scale(1.25); }

@media (max-width: 767px) {
    .carousel-wrapper img { height: 200px; }
    .carousel-arrow { width: 32px; height: 32px; font-size: 14px; }
}

/* ===================================================
   首页内容样式
   =================================================== */

.feature-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin: 12px 0 24px;
}

.feature-item {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 24px;
    transition: border-color 0.25s, box-shadow 0.25s, transform 0.2s;
}
.feature-item:hover {
    border-color: var(--text-muted);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}
.feature-icon { font-size: 28px; margin-bottom: 10px; }
.feature-item h4 {
    font-size: 15px;
    color: #fff;
    margin-bottom: 8px;
    font-weight: 500;
}
.feature-item p { font-size: 13px; color: var(--text-secondary); margin: 0; }

.product-showcase {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr 1fr;
    gap: 14px;
    margin: 12px 0 24px;
}
.product-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    overflow: hidden;
    transition: border-color 0.25s, box-shadow 0.25s, transform 0.2s;
}
.product-card:hover {
    border-color: var(--text-muted);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}
.product-img {
    height: 140px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 42px;
    color: #fff;
    border-bottom: 1px solid var(--border-color);
}
.product-card h4 {
    font-size: 14px;
    padding: 12px 14px 4px;
    color: #fff;
    font-weight: 500;
}
.product-card p {
    font-size: 12px;
    padding: 0 14px 14px;
    color: var(--text-secondary);
    margin: 0;
}

.advantage-list { list-style: none; padding: 0; margin: 12px 0 24px; }
.advantage-list li {
    padding: 12px 16px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    margin-bottom: 8px;
    color: var(--text-secondary);
    line-height: 1.6;
    font-size: 14px;
    transition: border-color 0.2s;
}
.advantage-list li:hover { border-color: var(--text-muted); }
.advantage-list li strong { color: var(--accent); }

.contact-banner {
    background: linear-gradient(135deg, #1a1f2e, #0d1117);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 36px;
    text-align: center;
    margin: 30px 0 10px;
}
.contact-banner p { color: #fff; font-size: 18px; margin-bottom: 20px; }
.contact-btn {
    display: inline-block;
    padding: 10px 28px;
    border-radius: var(--radius-sm);
    text-decoration: none;
    font-size: 14px;
    margin: 0 6px;
    transition: opacity 0.2s, transform 0.2s;
    border: none;
    font-weight: 500;
}
.contact-btn:hover { opacity: 0.9; transform: translateY(-1px); }
.contact-btn:first-of-type { background-color: var(--accent); color: #fff; }
.contact-btn-wa { background-color: var(--green); color: #000; }

@media (max-width: 767px) {
    .feature-grid { grid-template-columns: 1fr; gap: 10px; }
    .product-showcase { grid-template-columns: 1fr 1fr; gap: 10px; }
    .product-img { height: 100px; font-size: 32px; }
    .contact-banner { padding: 24px 16px; }
    .contact-btn { display: block; margin: 8px auto; max-width: 200px; }
}
@media (max-width: 399px) {
    .product-showcase { grid-template-columns: 1fr; }
}

/* ===================================================
   留言表单
   =================================================== */

.contact-form {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 32px;
    margin: 12px 0 24px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.form-group {
    margin-bottom: 18px;
}

.form-group label {
    display: block;
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 6px;
    font-weight: 500;
}

.form-group .required {
    color: var(--accent);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 10px 14px;
    background: var(--bg-body);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 14px;
    font-family: inherit;
    transition: border-color 0.25s, box-shadow 0.25s;
    outline: none;
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--blue);
    box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.12);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-muted);
}

.form-submit {
    padding: 10px 32px;
    background-color: var(--accent);
    color: #fff;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.25s, transform 0.2s;
}

.form-submit:hover {
    background-color: var(--accent-hover);
    transform: translateY(-1px);
}

@media (max-width: 767px) {
    .form-row {
        grid-template-columns: 1fr;
        gap: 0;
    }

    .contact-form {
        padding: 20px;
    }
}

/* ===================================================
   页脚
   =================================================== */

.site-footer {
    width: 100%;
    background-color: #0a0e14;
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 13px;
}

.footer-inner {
    max-width: 1024px;
    margin: 0 auto;
    padding: 40px 20px 30px;
    display: grid;
    grid-template-columns: 1fr 1fr 1fr 1fr;
    gap: 30px;
}

.footer-col h4 {
    color: #fff;
    font-size: 15px;
    margin-bottom: 14px;
    position: relative;
    padding-bottom: 8px;
    font-weight: 500;
}
.footer-col h4::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 24px;
    height: 2px;
    background-color: var(--accent);
    border-radius: 1px;
}

.footer-about p { line-height: 1.8; color: var(--text-muted); }

.footer-links ul { list-style: none; padding: 0; }
.footer-links ul li { margin-bottom: 6px; }
.footer-links ul li a {
    color: var(--text-muted);
    text-decoration: none;
    transition: color 0.2s, padding-left 0.2s;
    font-size: 13px;
}
.footer-links ul li a:hover { color: var(--accent); padding-left: 4px; }

.footer-contact p { margin-bottom: 6px; color: var(--text-muted); font-size: 13px; }

.social-icons { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 8px; }
.social-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
    border-radius: 50%;
    background-color: rgba(255,255,255,0.06);
    transition: background-color 0.25s, transform 0.2s;
    text-decoration: none;
    border: 1px solid var(--border-color);
}
.social-icon:hover { transform: translateY(-2px); border-color: transparent; }
.social-icon img { width: 16px; height: 16px; display: block; opacity: 0.7; transition: opacity 0.2s; }
.social-icon:hover img { opacity: 1; }
.social-whatsapp:hover { background-color: var(--green); }
.social-wechat:hover { background-color: #07C160; }
.social-email:hover { background-color: #EA4335; }
.social-facebook:hover { background-color: #1877F2; }
.social-youtube:hover { background-color: #FF0000; }

.social-fallback { display: none; font-size: 10px; color: #fff; }
.social-icon img[style*="display: none"] + .social-fallback { display: inline; }
.footer-wechat-tip { color: var(--text-muted); font-size: 12px; margin-top: 4px; }
.footer-wechat-tip strong { color: var(--green); }

.footer-bottom {
    border-top: 1px solid var(--border-color);
    text-align: center;
    padding: 16px 20px;
    color: var(--text-muted);
    font-size: 12px;
}

@media (max-width: 767px) {
    .footer-inner { grid-template-columns: 1fr; gap: 20px; padding: 28px 20px 18px; }
    .footer-col h4 { margin-bottom: 10px; }
    .social-icons { gap: 6px; }
    .social-icon { width: 32px; height: 32px; }
    .social-icon img { width: 14px; height: 14px; }
}

/* ===================================================
   滚动条美化
   =================================================== */

::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg-body); }
::-webkit-scrollbar-thumb { background: var(--border-color); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* Firefox 滚动条 */
* { scrollbar-width: thin; scrollbar-color: var(--border-color) var(--bg-body); }

/* ===================================================
   选中文本颜色
   =================================================== */

::selection { background-color: var(--accent); color: #fff; }

/* ===================================================
   链接通用样式
   =================================================== */

a { color: var(--blue); transition: color 0.2s; }
a:hover { color: #fff; }