/* Common Styles for All Pages */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #0078d4;
    --secondary-color: #106ebe;
    --accent-color: #40e0d0;
    --text-primary: #1a1a1a;
    --text-secondary: #4a4a4a;
    --text-light: #6a6a6a;
    --background-primary: #ffffff;
    --background-secondary: #f8f9fa;
    --background-tertiary: #f1f3f4;
    --background-page: #f5f7fa;
    --border-color: #e1e5e9;
    --shadow-light: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-medium: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-heavy: 0 8px 24px rgba(0, 0, 0, 0.12);
    --border-radius: 12px;
    --border-radius-large: 16px;
    --transition: all 0.3s ease;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: linear-gradient(135deg,
            rgba(240, 248, 255, 0.9) 0%,
            rgba(230, 240, 250, 0.8) 25%,
            rgba(220, 235, 255, 0.9) 50%,
            rgba(210, 230, 250, 0.8) 75%,
            rgba(200, 225, 255, 0.9) 100%);
    background-attachment: fixed;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    max-width: 100vw;
    overflow-x: hidden;
}

.de_iv_adv {
    width: 100%;
    height: auto;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 5px 0;
    /* background-color: #F8F8F8; */
    margin: 10px 0 0px;
}

/* 底部广告位 */
.postionFixed {
    width: 100%;
    min-height: 60px;
    position: fixed;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: #F8F8F8;
    right: 0;
    left: 0;
    bottom: 0;
    z-index: 9999;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Header Styles */
.header {
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.3);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 0;
    gap: 2rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 600;
    font-size: 1.25rem;
}

.logo a {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    color: inherit;
}

.logo img {
    width: 160px;
    height: 32px;
    border-radius: 6px;
}

.nav-menu ul {
    display: flex;
    list-style: none;
    gap: 2rem;
    align-items: center;
}

.nav-menu a {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--primary-color);
    background-color: var(--background-secondary);
}

/* Search Styles */
.search-container {
    flex: 1;
    max-width: 600px;
    min-width: 300px;
}

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

.search-input {
    width: 100%;
    padding: 0.75rem 1rem;
    padding-right: 3rem;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-large);
    font-size: 1rem;
    transition: var(--transition);
    background: var(--background-tertiary);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-color);
    background: var(--background-primary);
}

.search-btn {
    position: absolute;
    right: 0.5rem;
    background: none;
    border: none;
    color: var(--text-light);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.search-btn:hover {
    color: var(--primary-color);
    background: var(--background-secondary);
}

/* Mobile Menu */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.75rem;
    gap: 4px;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.mobile-menu-toggle:hover {
    background: var(--background-secondary);
}

.mobile-menu-toggle span {
    width: 22px;
    height: 3px;
    background: var(--text-primary);
    transition: var(--transition);
    border-radius: 2px;
}

.mobile-menu-toggle:hover span {
    background: var(--primary-color);
}

/* Main Content */
.main-content {
    flex: 1;
    padding-bottom: 20px;

}

/* Footer Styles */
.footer {
    background: var(--background-secondary);
    border-top: 1px solid var(--border-color);
    margin-top: auto;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 2rem;
    padding: 2rem 0;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
    font-weight: 600;
    font-size: 1.25rem;
}

.footer-logo img {
    width: 160px;
    height: 32px;
    border-radius: 6px;
}

.footer-description {
    color: var(--text-secondary);
    line-height: 1.6;
}

.footer-section h3 {
    margin-bottom: 1rem;
    color: var(--text-primary);
    font-size: 1.1rem;
}

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

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

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

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

.footer-bottom {
    border-top: 1px solid var(--border-color);
    padding: 1rem 0;
    text-align: center;
    color: var(--text-light);
}

/* Back to Top Button */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-medium);
    transition: var(--transition);
    z-index: 1000;
}

.back-to-top:hover {
    background: var(--secondary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-heavy);
}

.back-to-top.show {
    display: flex;
}

/* Loading Spinner */
.loading-spinner {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.9);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--border-color);
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% {
        transform: rotate(0deg);
    }

    100% {
        transform: rotate(360deg);
    }
}

/* Utility Classes */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background: var(--primary-color);
    color: white;
    text-decoration: none;
    border: none;
    border-radius: var(--border-radius);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.btn:hover {
    background: var(--secondary-color);
    transform: translateY(-1px);
    box-shadow: var(--shadow-medium);
}

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

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

.text-center {
    text-align: center;
}

.mb-1 {
    margin-bottom: 0.5rem;
}

.mb-2 {
    margin-bottom: 1rem;
}

.mb-3 {
    margin-bottom: 1.5rem;
}

.mb-4 {
    margin-bottom: 2rem;
}

.mt-1 {
    margin-top: 0.5rem;
}

.mt-2 {
    margin-top: 1rem;
}

.mt-3 {
    margin-top: 1.5rem;
}

.mt-4 {
    margin-top: 2rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 10px;
    }

    .header-content {
        flex-wrap: wrap;
        gap: 1rem;
    }

    .nav-menu {
        display: none;
        width: 100%;
        order: 3;
    }

    .nav-menu.active {
        display: block;
    }

    .nav-menu ul {
        flex-direction: column;
        gap: 0;
        background: var(--background-primary);
        border: 1px solid var(--border-color);
        border-radius: var(--border-radius);
        padding: 1rem;
        margin-top: 1rem;
    }

    .nav-menu ul li {
        width: 100%;
    }

    .nav-menu a {
        display: block;
        width: 100%;
        padding: 0.75rem 1rem;
        border-bottom: 1px solid var(--border-color);
    }

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

    .mobile-menu-toggle {
        display: flex;
    }

    .search-container {
        order: 2;
        flex: 1;
        min-width: 200px;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 1.5rem;
        text-align: center;
    }

    .back-to-top {
        bottom: 1rem;
        right: 1rem;
        width: 45px;
        height: 45px;
    }
}

@media (max-width: 480px) {
    .header-content {
        padding: 0.75rem 0;
    }

    .logo {
        font-size: 1.1rem;
    }

    .logo img {
        /* width: 28px; */
        height: 28px;
    }

    .search-input {
        padding: 0.6rem 0.8rem;
        padding-right: 2.5rem;
        font-size: 0.9rem;
    }

    .main-content {
        padding: 1rem 0;
    }

    .footer-content {
        padding: 1.5rem 0;
    }
}