/* Basic Reset & Body Styles */
:root {
    --primary-color: #007bff;
    --secondary-color: #6c757d;
    --text-color: #333;
    --background-color: #f8f9fa;
    --light-gray: #e9ecef;
    --dark-gray: #343a40;
    --accent-color: #28a745;
}

body {
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    margin: 0;
    padding: 0;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

a {
    color: var(--primary-color);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

img {
    max-width: 100%;
    height: auto;
}

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

/* Header Styles */
.site-header {
    background-color: var(--dark-gray);
    color: #fff;
    padding: 15px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

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

.logo img {
    height: 40px;
}

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

.main-navigation ul li {
    position: relative;
    margin-left: 25px;
}

.main-navigation ul li a {
    color: #fff;
    padding: 10px 0;
    display: block;
    white-space: nowrap;
}

.main-navigation ul li a:hover {
    color: var(--primary-color);
    text-decoration: none;
}

.main-navigation .submenu {
    display: none;
    position: absolute;
    background-color: var(--dark-gray);
    min-width: 180px;
    z-index: 100;
    list-style: none;
    padding: 10px 0;
    border-top: 3px solid var(--primary-color);
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}

.main-navigation .submenu li {
    margin: 0;
}

.main-navigation .submenu li a {
    padding: 8px 20px;
    color: #fff;
}

.main-navigation .submenu li a:hover {
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--primary-color);
}

.main-navigation ul li:hover > .submenu {
    display: block;
}

.menu-toggle {
    display: none; /* Hidden on desktop */
    background: none;
    border: none;
    color: #fff;
    font-size: 24px;
    cursor: pointer;
    padding: 5px;
}

.menu-toggle .icon-bar {
    display: block;
    width: 22px;
    height: 2px;
    background-color: #fff;
    border-radius: 1px;
    margin: 4px 0;
}

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

.search-box {
    position: relative;
}

.search-box input {
    border: 1px solid var(--light-gray);
    padding: 8px 12px;
    border-radius: 5px;
    background-color: #fff;
    color: var(--text-color);
    width: 180px;
}

.search-box button {
    background: none;
    border: none;
    color: var(--text-color);
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    cursor: pointer;
    font-size: 1em;
}

.btn {
    padding: 8px 15px;
    border-radius: 5px;
    text-decoration: none;
    transition: background-color 0.3s ease, border-color 0.3s ease;
    white-space: nowrap;
}

.btn-primary {
    background-color: var(--primary-color);
    color: #fff;
    border: 1px solid var(--primary-color);
}

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

.btn-secondary {
    background-color: var(--secondary-color);
    color: #fff;
    border: 1px solid var(--secondary-color);
}

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

.announcement-bar {
    background-color: #ffc107; /* Warning yellow */
    color: var(--dark-gray);
    text-align: center;
    padding: 10px 0;
    font-size: 0.9em;
    font-weight: 500;
}

.announcement-bar .promo-link {
    color: var(--dark-gray);
    font-weight: bold;
    text-decoration: underline;
}

/* Footer Styles */
.site-footer {
    background-color: var(--dark-gray);
    color: var(--light-gray);
    padding: 40px 0 20px;
    font-size: 0.9em;
}

.footer-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 20px;
}

.footer-section {
    flex: 1;
    min-width: 200px;
    margin-bottom: 20px;
}

.footer-section h3 {
    color: #fff;
    margin-bottom: 15px;
    font-size: 1.1em;
    border-bottom: 1px solid rgba(255,255,255,0.1);
    padding-bottom: 8px;
}

.footer-section p {
    margin-bottom: 10px;
}

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

.footer-section ul li {
    margin-bottom: 8px;
}

.footer-section ul li a {
    color: var(--light-gray);
    text-decoration: none;
}

.footer-section ul li a:hover {
    color: var(--primary-color);
    text-decoration: underline;
}

.social-icons a {
    display: inline-block;
    color: #fff;
    font-size: 1.5em;
    margin-right: 15px;
    transition: color 0.3s ease;
}

.social-icons a:hover {
    color: var(--primary-color);
}

.newsletter-signup {
    margin-top: 20px;
}

.newsletter-signup form {
    display: flex;
    margin-top: 10px;
}

.newsletter-signup input[type="email"] {
    flex-grow: 1;
    padding: 8px;
    border: 1px solid var(--light-gray);
    border-radius: 4px 0 0 4px;
    background-color: #fff;
    color: var(--text-color);
}

.newsletter-signup button {
    padding: 8px 15px;
    background-color: var(--primary-color);
    color: #fff;
    border: 1px solid var(--primary-color);
    border-radius: 0 4px 4px 0;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.newsletter-signup button:hover {
    background-color: #0056b3;
    border-color: #0056b3;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 20px;
    margin-top: 30px;
    text-align: center;
}

.footer-bottom p {
    margin: 5px 0;
    color: var(--light-gray);
}

.footer-bottom a {
    color: var(--light-gray);
    margin: 0 10px;
}

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

/* Utility classes */
.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;
}

/* Responsive adjustments */
@media (max-width: 992px) {
    .main-navigation ul {
        margin-left: 0;
    }
    .main-navigation ul li {
        margin-left: 15px;
    }
    .header-actions {
        gap: 10px;
    }
}

@media (max-width: 768px) {
    .header-container {
        flex-direction: column;
        align-items: flex-start;
    }
    .main-navigation {
        width: 100%;
        order: 3; /* Push navigation below actions on mobile */
    }
    .main-navigation ul {
        display: none;
        flex-direction: column;
        width: 100%;
        position: static;
        background-color: var(--dark-gray);
        padding: 10px 0;
        box-shadow: none;
        border-top: 1px solid rgba(255,255,255,0.1);
    }
    .main-navigation ul.active {
        display: flex;
    }
    .menu-toggle {
        display: block;
        align-self: flex-end;
        order: 2; /* Position toggle button */
    }
    .main-navigation ul li {
        margin: 0;
        width: 100%;
        border-bottom: 1px solid rgba(255,255,255,0.05);
    }
    .main-navigation ul li:last-child {
        border-bottom: none;
    }
    .main-navigation ul li a {
        padding: 12px 20px;
    }
    .main-navigation .submenu {
        position: static;
        display: none;
        background-color: rgba(0,0,0,0.2);
        padding-left: 20px;
        border-top: none;
        box-shadow: none;
    }
    .main-navigation .menu-item.submenu-open > .submenu {
        display: block;
    }
    .header-actions {
        order: 2;
        width: 100%;
        justify-content: space-between;
        margin-top: 15px;
    }
    .search-box {
        flex-grow: 1;
        margin-right: 10px;
    }
    .search-box input {
        width: 100%;
    }
    .logo {
        order: 1;
        margin-bottom: 15px;
    }

    .footer-container {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
    .footer-section {
        width: 100%;
        min-width: unset;
    }
    .social-icons {
        margin-top: 15px;
    }
    .newsletter-signup form {
        flex-direction: column;
        align-items: center;
    }
    .newsletter-signup input[type="email"] {
        border-radius: 4px;
        margin-bottom: 10px;
        width: 80%;
        max-width: 300px;
    }
    .newsletter-signup button {
        border-radius: 4px;
        width: 80%;
        max-width: 300px;
    }
}
/* 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;
  }
}