/* Basic Reset & Body Styles */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Arial', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f4f4f4;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

a:hover {
    text-decoration: underline;
}

ul {
    list-style: none;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 10px 20px;
    font-size: 1rem;
    font-weight: bold;
    text-align: center;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s ease, color 0.3s ease;
    border: none;
}

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

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

.btn-secondary {
    background-color: #6c757d;
    color: #fff;
}

.btn-secondary:hover {
    background-color: #5a6268;
}

/* Header Top Bar */
.header-top-bar {
    background-color: #333;
    color: #fff;
    padding: 10px 0;
    font-size: 0.9rem;
}

.header-top-bar .top-bar-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

.header-top-bar .contact-info span {
    margin-right: 20px;
}

.header-top-bar .contact-info i {
    margin-right: 5px;
}

.header-top-bar .social-links a {
    color: #fff;
    margin-left: 15px;
    font-size: 1.1rem;
}

.header-top-bar .social-links a:hover {
    color: #007bff;
    text-decoration: none;
}

/* Main Navigation */
.main-nav {
    background-color: #fff;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    padding: 15px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}

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

.main-nav .logo img {
    max-height: 40px;
    vertical-align: middle;
}

.main-nav .menu-toggle {
    display: none; /* Hidden on desktop */
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    width: 30px;
    height: 20px;
    position: relative;
    z-index: 1001;
}

.main-nav .menu-toggle .icon-bar {
    display: block;
    width: 100%;
    height: 3px;
    background-color: #333;
    margin-bottom: 5px;
    transition: all 0.3s ease;
}

.main-nav .menu-toggle .icon-bar:last-child {
    margin-bottom: 0;
}

.main-nav .nav-links-wrapper {
    display: flex;
    align-items: center;
}

.main-nav .nav-links {
    display: flex;
    margin: 0;
    padding: 0;
}

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

.main-nav .nav-links a {
    display: block;
    padding: 10px 0;
    color: #333;
    font-weight: bold;
    text-decoration: none;
    transition: color 0.3s ease;
}

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

.main-nav .nav-links .has-dropdown > a i {
    margin-left: 5px;
    font-size: 0.8em;
}

.main-nav .dropdown-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background-color: #fff;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    min-width: 200px;
    z-index: 10;
    border-top: 3px solid #007bff;
}

.main-nav .nav-links li.has-dropdown:hover > .dropdown-menu {
    display: block;
}

.main-nav .dropdown-menu li {
    margin: 0;
}

.main-nav .dropdown-menu a {
    padding: 10px 20px;
    white-space: nowrap;
    font-weight: normal;
}

.main-nav .auth-buttons {
    margin-left: 30px;
}

.main-nav .auth-buttons .btn {
    margin-left: 10px;
}

/* Footer */
.main-footer {
    background-color: #222;
    color: #bbb;
    padding: 50px 0 20px;
    font-size: 0.9rem;
}

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

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

.main-footer .footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-bottom: 30px;
}

.main-footer .footer-col h3 {
    color: #fff;
    margin-bottom: 20px;
    font-size: 1.2rem;
}

.main-footer .footer-col ul {
    list-style: none;
}

.main-footer .footer-col ul li {
    margin-bottom: 10px;
}

.main-footer .footer-col address p {
    margin-bottom: 10px;
}

.main-footer .footer-col address i {
    margin-right: 10px;
    color: #007bff;
}

.main-footer .social-media-footer a {
    display: inline-block;
    width: 35px;
    height: 35px;
    line-height: 35px;
    text-align: center;
    background-color: #444;
    border-radius: 50%;
    margin-right: 10px;
    color: #fff;
    transition: background-color 0.3s ease;
}

.main-footer .social-media-footer a:hover {
    background-color: #007bff;
}

.main-footer .newsletter-form {
    display: flex;
    margin-top: 15px;
}

.main-footer .newsletter-form input[type="email"] {
    flex-grow: 1;
    padding: 10px;
    border: 1px solid #444;
    border-radius: 5px 0 0 5px;
    background-color: #333;
    color: #fff;
}

.main-footer .newsletter-form input[type="email"]::placeholder {
    color: #aaa;
}

.main-footer .newsletter-form .btn {
    border-radius: 0 5px 5px 0;
    padding: 10px 15px;
}

.main-footer .footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid #333;
    margin-top: 30px;
}

.main-footer .footer-bottom p {
    margin: 0;
}

/* Scroll to Top Button */
.scroll-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background-color: #007bff;
    color: #fff;
    border: none;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    font-size: 1.5rem;
    line-height: 50px;
    text-align: center;
    cursor: pointer;
    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
    transition: background-color 0.3s ease, opacity 0.3s ease;
    z-index: 999;
    display: none; /* Hidden by default, shown by JS */
}

.scroll-to-top:hover {
    background-color: #0056b3;
}

/* Responsive Styles */
@media (max-width: 992px) {
    .main-nav .nav-links-wrapper {
        display: none; /* Hide by default on smaller screens */
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: #fff;
        box-shadow: 0 5px 10px rgba(0,0,0,0.1);
        padding: 20px 0;
        z-index: 999;
    }

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

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

    .main-nav .nav-links li {
        margin: 0;
        border-bottom: 1px solid #eee;
    }

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

    .main-nav .nav-links a {
        padding: 15px 20px;
    }

    .main-nav .dropdown-menu {
        position: static;
        box-shadow: none;
        border-top: none;
        background-color: #f9f9f9;
        width: 100%;
        padding-left: 20px;
    }

    .main-nav .auth-buttons {
        margin-top: 20px;
        margin-left: 0;
        display: flex;
        flex-direction: column;
        align-items: center;
        width: 100%;
        padding: 0 20px;
    }

    .main-nav .auth-buttons .btn {
        width: 100%;
        margin: 5px 0;
    }

    .main-nav .menu-toggle {
        display: block; /* Show on smaller screens */
    }

    /* Hamburger menu animation */
    .main-nav .menu-toggle.active .icon-bar:nth-child(1) {
        transform: rotate(-45deg) translate(-5px, 6px);
    }
    .main-nav .menu-toggle.active .icon-bar:nth-child(2) {
        opacity: 0;
    }
    .main-nav .menu-toggle.active .icon-bar:nth-child(3) {
        transform: rotate(45deg) translate(-5px, -6px);
    }

    .header-top-bar .top-bar-content {
        flex-direction: column;
        text-align: center;
    }
    .header-top-bar .contact-info {
        margin-bottom: 10px;
    }
    .header-top-bar .contact-info span {
        display: block;
        margin-right: 0;
        margin-bottom: 5px;
    }
    .header-top-bar .social-links {
        margin-top: 10px;
    }
}

@media (max-width: 768px) {
    .main-footer .footer-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .main-footer .footer-col ul {
        padding: 0;
    }

    .main-footer .social-media-footer {
        margin-top: 15px;
        justify-content: center;
        display: flex;
    }

    .main-footer .newsletter-form {
        justify-content: center;
    }
    .main-footer .newsletter-form input[type="email"] {
        max-width: 250px;
    }
}
/* 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;
  }
}