/* shared_css: 基础样式和通用组件 */
body {
    font-family: 'PingFang SC', 'Helvetica Neue', Helvetica, 'Microsoft YaHei', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    margin: 0;
    padding: 0;
    background-color: #f8f9fa;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

h1, h2, h3, h4, h5, h6 {
    color: #212529;
    margin-top: 0;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

p {
    margin-top: 0;
    margin-bottom: 1rem;
}

a {
    color: #007bff;
    text-decoration: none;
}

a:hover {
    color: #0056b3;
    text-decoration: underline;
}

.btn {
    display: inline-block;
    font-weight: 400;
    color: #fff;
    text-align: center;
    vertical-align: middle;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    background-color: #007bff;
    border: 1px solid #007bff;
    padding: 0.5rem 1rem;
    font-size: 1rem;
    line-height: 1.5;
    border-radius: 0.25rem;
    transition: color 0.15s ease-in-out, background-color 0.15s ease-in-out, border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}

.btn-primary {
    background-color: #007bff;
    border-color: #007bff;
}

.btn-primary:hover {
    background-color: #0056b3;
    border-color: #0056b3;
}

.btn-secondary {
    color: #007bff;
    background-color: transparent;
    border-color: #007bff;
}

.btn-secondary:hover {
    color: #fff;
    background-color: #007bff;
    border-color: #007bff;
}

.main-header {
    background-color: #fff;
    box-shadow: 0 2px 4px rgba(0,0,0,.08);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.main-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.main-header .logo img {
    height: 40px;
}

.main-nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
}

.main-nav ul li {
    margin-left: 30px;
    position: relative;
}

.main-nav ul li a {
    color: #333;
    font-weight: 500;
    padding: 10px 0;
    display: block;
}

.main-nav ul li a:hover {
    color: #007bff;
    text-decoration: none;
}

.dropdown .dropbtn {
    cursor: pointer;
}

.dropdown-content {
    display: none;
    position: absolute;
    background-color: #f9f9f9;
    min-width: 160px;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
    z-index: 1;
    border-radius: 0.25rem;
}

.dropdown-content a {
    color: black;
    padding: 12px 16px;
    text-decoration: none;
    display: block;
    text-align: left;
}

.dropdown-content a:hover {
    background-color: #f1f1f1;
}

.dropdown:hover .dropdown-content {
    display: block;
}

.header-actions button {
    margin-left: 10px;
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    padding: 0;
    cursor: pointer;
}

.menu-toggle .icon-bar {
    display: block;
    width: 25px;
    height: 3px;
    background-color: #333;
    margin: 5px 0;
    transition: all 0.3s ease;
}

.main-footer {
    background-color: #212529;
    color: #f8f9fa;
    padding: 4rem 0 2rem;
    font-size: 0.9rem;
}

.main-footer a {
    color: #adb5bd;
}

.main-footer a:hover {
    color: #fff;
    text-decoration: underline;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 30px;
    margin-bottom: 3rem;
}

.footer-col h3 {
    color: #fff;
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
}

.footer-col ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-col ul li {
    margin-bottom: 0.8rem;
}

.footer-col.company-info .footer-logo {
    margin-bottom: 1rem;
}

.footer-col.company-info p {
    margin-bottom: 1.5rem;
}

.social-links a {
    display: inline-block;
    margin-right: 15px;
}

.social-links img {
    width: 24px;
    height: 24px;
    filter: brightness(0) invert(1);
}

.footer-bottom {
    border-top: 1px solid #343a40;
    padding-top: 2rem;
    text-align: center;
    color: #adb5bd;
}

.footer-bottom p {
    margin-bottom: 0.5rem;
}

/* 响应式设计 */
@media (max-width: 992px) {
    .main-nav {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background-color: #fff;
        box-shadow: 0 4px 8px rgba(0,0,0,.1);
        flex-direction: column;
        align-items: center;
        padding: 1rem 0;
    }

    .main-nav.active {
        display: flex;
    }

    .main-nav ul {
        flex-direction: column;
        width: 100%;
    }

    .main-nav ul li {
        margin: 0;
        width: 100%;
        text-align: center;
        border-bottom: 1px solid #eee;
    }

    .main-nav ul li:last-child {
        border-bottom: none;
    }

    .dropdown-content {
        position: static;
        box-shadow: none;
        background-color: #f1f1f1;
        width: 100%;
    }

    .dropdown:hover .dropdown-content {
        display: none;
    }

    .dropdown.active .dropdown-content {
        display: block;
    }

    .header-actions {
        display: flex;
        align-items: center;
    }

    .header-actions .btn {
        display: none;
    }

    .menu-toggle {
        display: block;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .footer-col.company-info {
        order: -1; /* Move company info to top on mobile */
    }

    .social-links {
        justify-content: center;
        display: flex;
    }
}
/* 移动端内容区防溢出（系统追加，请勿删除） */
@media (max-width: 768px) {
  .page-content img {
    max-width: 100% !important;
    height: auto !important;
    display: block;
  }
  .page-content {
    overflow-x: hidden;
    max-width: 100%;
  }
  body {
    overflow-x: hidden;
  }
}