/* Global Resets & Base Styles */
:root {
    --primary-color: #007bff;
    --secondary-color: #6c757d;
    --accent-color: #28a745;
    --text-color: #333;
    --light-bg: #f8f9fa;
    --dark-bg: #343a40;
    --border-color: #dee2e6;
    --font-family-sans: 'Arial', sans-serif;
    --header-height: 80px;
    --footer-height: 250px; /* Approximate */
}

*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family-sans);
    line-height: 1.6;
    color: var(--text-color);
    background-color: #fff;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

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

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.3s ease, text-decoration 0.3s ease;
}

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

ul {
    list-style: none;
}

h1, h2, h3, h4, h5, h6 {
    margin-bottom: 0.5em;
    font-weight: 700;
    color: #222;
}

p {
    margin-bottom: 1em;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 10px 20px;
    border-radius: 5px;
    font-weight: 600;
    text-align: center;
    cursor: pointer;
    border: none;
    transition: all 0.3s ease;
}

.btn-primary {
    background-color: var(--primary-color);
    color: #fff;
}

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

.btn-secondary {
    background-color: var(--secondary-color);
    color: #fff;
}

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

/* Header Specific Styles */
.main-header {
    background-color: #fff;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: relative;
    z-index: 1000;
}

.header-top-bar {
    background-color: var(--dark-bg);
    color: #fff;
    padding: 10px 0;
    font-size: 0.9em;
}

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

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

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

.header-top-bar .social-links a:hover {
    color: var(--primary-color);
}

.header-main-nav {
    padding: 15px 0;
}

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

.navbar-brand .logo {
    display: block;
}

.navbar-brand img {
    max-height: 40px;
    width: auto;
}

.main-navigation .nav-menu {
    display: flex;
    gap: 25px;
}

.main-navigation .nav-menu .menu-item a {
    color: var(--text-color);
    font-weight: 500;
    padding: 5px 0;
    position: relative;
}

.main-navigation .nav-menu .menu-item a:hover,
.main-navigation .nav-menu .menu-item.current-menu-item > a {
    color: var(--primary-color);
}

.main-navigation .nav-menu .menu-item-has-children {
    position: relative;
}

.main-navigation .nav-menu .sub-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background-color: #fff;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    min-width: 200px;
    padding: 10px 0;
    border-radius: 5px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.3s ease;
    z-index: 10;
}

.main-navigation .nav-menu .menu-item-has-children:hover > .sub-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.main-navigation .nav-menu .sub-menu li a {
    display: block;
    padding: 8px 20px;
    color: var(--text-color);
    white-space: nowrap;
}

.main-navigation .nav-menu .sub-menu li a:hover {
    background-color: var(--light-bg);
    color: var(--primary-color);
    text-decoration: none;
}

.menu-toggle {
    display: none; /* Hidden on desktop */
    background: none;
    border: none;
    font-size: 1.5em;
    cursor: pointer;
    color: var(--text-color);
}

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

.header-actions {
    display: flex;
    gap: 15px;
    align-items: center;
}

.search-toggle {
    background: none;
    border: none;
    font-size: 1.2em;
    cursor: pointer;
    color: var(--text-color);
    padding: 0;
}

.search-toggle:hover {
    color: var(--primary-color);
}

.search-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 10000;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.search-overlay.active {
    opacity: 1;
    visibility: visible;
}

.search-container {
    background-color: #fff;
    padding: 30px;
    border-radius: 8px;
    width: 90%;
    max-width: 600px;
    position: relative;
    box-shadow: 0 5px 25px rgba(0,0,0,0.2);
}

.search-form {
    display: flex;
    align-items: center;
}

.search-form input[type="search"] {
    flex-grow: 1;
    padding: 12px 15px;
    border: 1px solid var(--border-color);
    border-radius: 5px 0 0 5px;
    font-size: 1em;
    outline: none;
}

.search-form button[type="submit"] {
    background-color: var(--primary-color);
    color: #fff;
    border: none;
    padding: 12px 18px;
    border-radius: 0 5px 5px 0;
    cursor: pointer;
    font-size: 1em;
}

.search-form button[type="submit"]:hover {
    background-color: #0056b3;
}

.close-search {
    position: absolute;
    top: 15px;
    right: 15px;
    background: none;
    border: none;
    font-size: 1.5em;
    cursor: pointer;
    color: #666;
}

.close-search:hover {
    color: var(--primary-color);
}


/* Footer Specific Styles */
.main-footer {
    background-color: var(--dark-bg);
    color: #fff;
    padding: 60px 0 20px;
    font-size: 0.95em;
    margin-top: auto; /* Pushes footer to the bottom */
}

.footer-widgets {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
}

.footer-widget .widget-title {
    color: #fff;
    font-size: 1.3em;
    margin-bottom: 20px;
    position: relative;
}

.footer-widget .widget-title::after {
    content: '';
    display: block;
    width: 50px;
    height: 3px;
    background-color: var(--primary-color);
    margin-top: 10px;
}

.footer-widget p {
    color: #ccc;
    line-height: 1.8;
}

.footer-widget ul {
    padding: 0;
    margin: 0;
}

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

.footer-widget ul li a {
    color: #ccc;
    display: block;
}

.footer-widget ul li a:hover {
    color: var(--primary-color);
    text-decoration: none;
    transform: translateX(5px);
    transition: transform 0.2s ease;
}

.footer-widget .contact-details p {
    margin-bottom: 10px;
    display: flex;
    align-items: flex-start;
}

.footer-widget .contact-details p i {
    margin-right: 10px;
    color: var(--primary-color);
    margin-top: 3px;
}

.newsletter-form {
    display: flex;
    margin-top: 20px;
}

.newsletter-form input[type="email"] {
    flex-grow: 1;
    padding: 10px 15px;
    border: 1px solid #555;
    border-radius: 5px 0 0 5px;
    background-color: #444;
    color: #fff;
    outline: none;
}

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

.newsletter-form .btn-subscribe {
    background-color: var(--primary-color);
    color: #fff;
    border-radius: 0 5px 5px 0;
    padding: 10px 20px;
    border: none;
    cursor: pointer;
}

.newsletter-form .btn-subscribe:hover {
    background-color: #0056b3;
}

.social-media-footer {
    margin-top: 25px;
    display: flex;
    gap: 15px;
}

.social-media-footer a {
    color: #fff;
    font-size: 1.3em;
    width: 40px;
    height: 40px;
    border: 1px solid #555;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.social-media-footer a:hover {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    color: #fff;
}

.footer-bottom {
    border-top: 1px solid #444;
    padding-top: 20px;
    margin-top: 30px;
    text-align: center;
    font-size: 0.85em;
    color: #aaa;
}

.footer-bottom a {
    color: #aaa;
    margin: 0 5px;
}

.footer-bottom a:hover {
    color: var(--primary-color);
}

/* Responsive Design */
@media (max-width: 992px) {
    .main-navigation .nav-menu {
        display: none; /* Hide on smaller screens by default */
        flex-direction: column;
        position: absolute;
        top: var(--header-height); /* Adjust based on actual header height */
        left: 0;
        width: 100%;
        background-color: #fff;
        box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        padding: 20px;
        border-top: 1px solid var(--border-color);
    }

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

    .main-navigation .nav-menu .menu-item {
        margin-bottom: 10px;
    }

    .main-navigation .nav-menu .menu-item a {
        padding: 10px 0;
        border-bottom: 1px solid #eee;
    }

    .main-navigation .nav-menu .sub-menu {
        position: static;
        box-shadow: none;
        transform: none;
        opacity: 1;
        visibility: visible;
        padding-left: 20px;
        margin-top: 10px;
        background-color: var(--light-bg);
        border-radius: 0;
    }

    .main-navigation .nav-menu .sub-menu li a {
        border-bottom: none;
    }

    .menu-toggle {
        display: block; /* Show hamburger menu */
    }

    .header-main-nav > .container {
        flex-wrap: wrap;
    }

    .header-actions {
        order: 3; /* Move actions below logo/toggle */
        width: 100%;
        justify-content: flex-end;
        margin-top: 10px;
    }

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

    .footer-widgets {
        grid-template-columns: 1fr;
        text-align: center;
    }
    .footer-widget .widget-title::after {
        margin-left: auto;
        margin-right: auto;
    }
    .newsletter-form {
        justify-content: center;
    }
    .social-media-footer {
        justify-content: center;
    }
}

@media (max-width: 768px) {
    .header-main-nav > .container {
        flex-direction: row; /* Keep logo and toggle on one line */
        justify-content: space-between;
    }
    .navbar-brand {
        flex-grow: 1;
    }
    .header-actions {
        order: initial; /* Reset order */
        width: auto;
        margin-top: 0;
    }
}

@media (max-width: 576px) {
    .header-actions .btn {
        padding: 8px 15px;
        font-size: 0.9em;
    }
    .search-form input[type="search"] {
        padding: 10px;
    }
    .search-form button {
        padding: 10px 15px;
    }
}

/* Accessibility */
[aria-hidden="true"] {
    display: none;
}
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Font Awesome Placeholder (assuming it's loaded elsewhere or via CDN) */
/* .fa, .fab, .fas { font-family: 'Font Awesome 5 Free'; } */
/* 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;
  }
}