/* shared.css - 全局样式表 */
:root {
    --primary-color: #007bff;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --info-color: #17a2b8;
    --light-color: #f8f9fa;
    --dark-color: #343a40;
    --text-color: #333;
    --bg-color: #ffffff;
    --border-color: #dee2e6;
    --font-family: 'Helvetica Neue', 'Arial', sans-serif;
    --header-height: 70px;
    --footer-height: auto;
}

/* 通用重置和基础样式 */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

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

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

a:hover {
    color: var(--primary-color);
    text-decoration: underline;
}

ul {
    list-style: none;
}

h1, h2, h3, h4, h5, h6 {
    margin-bottom: 1rem;
    font-weight: 700;
    line-height: 1.2;
    color: var(--dark-color);
}

p {
    margin-bottom: 1rem;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    font-weight: 400;
    color: #fff;
    text-align: center;
    vertical-align: middle;
    user-select: none;
    background-color: var(--primary-color);
    border: 1px solid var(--primary-color);
    padding: 0.75rem 1.5rem;
    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;
    cursor: pointer;
}

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

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

.btn-secondary {
    color: var(--dark-color);
    background-color: var(--light-color);
    border-color: var(--light-color);
}

.btn-secondary:hover {
    color: var(--dark-color);
    background-color: #e2e6ea;
    border-color: #dae0e5;
}

/* Header Styles */
.main-header {
    background-color: var(--bg-color);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}

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

.logo img {
    height: 40px;
    width: auto;
}

.main-nav .nav-list {
    display: flex;
    gap: 2rem;
}

.nav-item {
    position: relative;
}

.nav-link {
    display: block;
    padding: 0.5rem 0;
    font-weight: 500;
    color: var(--dark-color);
}

.nav-link:hover {
    color: var(--primary-color);
    text-decoration: none;
}

.dropdown-menu {
    display: none;
    position: absolute;
    background-color: var(--bg-color);
    box-shadow: 0 8px 16px rgba(0,0,0,0.1);
    min-width: 160px;
    z-index: 1;
    border-radius: 0.25rem;
    padding: 0.5rem 0;
    margin-top: 0.5rem;
}

.nav-item:hover .dropdown-menu {
    display: block;
}

.dropdown-menu li a {
    color: var(--dark-color);
    padding: 0.75rem 1rem;
    display: block;
    white-space: nowrap;
}

.dropdown-menu li a:hover {
    background-color: var(--light-color);
    text-decoration: none;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.menu-toggle {
    display: none; /* Hidden on desktop */
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.menu-toggle span {
    display: block;
    width: 25px;
    height: 3px;
    background-color: var(--dark-color);
    margin: 5px 0;
    transition: 0.4s;
}

/* Main Content Area */
#main-content {
    flex: 1; /* Allows main content to grow and push footer down */
    padding: 2rem 0;
}

/* Footer Styles */
.main-footer {
    background-color: var(--dark-color);
    color: var(--light-color);
    padding: 3rem 0 1rem;
    font-size: 0.9rem;
}

.footer-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section {
    flex: 1 1 200px; /* Allows sections to grow but minimum 200px width */
    margin-bottom: 1rem;
}

.footer-section h3 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
}

.footer-section p, .footer-section ul {
    margin-bottom: 1rem;
}

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section ul li a {
    color: var(--light-color);
}

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

.social-media a {
    color: var(--light-color);
    font-size: 1.5rem;
    margin-right: 1rem;
}

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

.newsletter-form {
    display: flex;
    gap: 0.5rem;
}

.newsletter-form input[type="email"] {
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 0.25rem;
    flex-grow: 1;
    background-color: rgba(255,255,255,0.1);
    color: var(--light-color);
}

.newsletter-form input[type="email"]::placeholder {
    color: rgba(255,255,255,0.7);
}

.newsletter-form button {
    padding: 0.75rem 1rem;
    border-radius: 0.25rem;
    border: none;
    background-color: var(--primary-color);
    color: #fff;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

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

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 1.5rem;
    text-align: center;
    font-size: 0.85rem;
}

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

.legal-links {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-top: 0.5rem;
}

.legal-links li a {
    color: var(--light-color);
}

.legal-links li a:hover {
    color: var(--primary-color);
}

.icp-info {
    margin-top: 0.5rem;
    color: rgba(255,255,255,0.7);
}

/* Responsive Design */
@media (max-width: 992px) {
    .main-nav {
        display: none; /* Hide main nav on smaller screens */
    }

    .header-actions {
        order: 2; /* Move actions to the right */
    }

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

    .header-container {
        justify-content: space-between;
    }

    /* Mobile navigation overlay (example) */
    .main-nav.active {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: var(--header-height);
        left: 0;
        width: 100%;
        background-color: var(--bg-color);
        box-shadow: 0 8px 16px rgba(0,0,0,0.1);
        z-index: 999;
        padding: 1rem 0;
    }

    .main-nav.active .nav-list {
        flex-direction: column;
        gap: 0;
    }

    .main-nav.active .nav-item {
        width: 100%;
        border-bottom: 1px solid var(--border-color);
    }

    .main-nav.active .nav-link {
        padding: 1rem 1.5rem;
    }

    .main-nav.active .dropdown-menu {
        position: static;
        box-shadow: none;
        padding-left: 1.5rem;
        margin-top: 0;
        border-radius: 0;
        border-top: 1px solid var(--border-color);
    }

    .main-nav.active .nav-item:hover .dropdown-menu {
        display: block;
    }

    .footer-container {
        flex-direction: column;
        text-align: center;
    }

    .footer-section {
        flex: 1 1 100%;
        margin-bottom: 2rem;
    }

    .footer-section h3 {
        text-align: center;
    }

    .social-media {
        justify-content: center;
        display: flex;
    }

    .newsletter-form {
        flex-direction: column;
        max-width: 300px;
        margin: 0 auto;
    }

    .footer-bottom .container {
        flex-direction: column;
    }

    .legal-links {
        margin-top: 1rem;
    }
}

@media (max-width: 768px) {
    .header-actions .btn {
        padding: 0.5rem 1rem;
        font-size: 0.9rem;
    }
}
/* 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;
  }
}