/* 
 * 学海智联 - 布局CSS文件
 * 包含页面布局、导航和页眉页脚样式
 */

/* ===== 页眉样式 ===== */
#header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    transition: all 0.3s ease;
    background-color: #fff;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
}

.logo-container {
    display: flex;
    align-items: center;
}

.logo-placeholder {
    margin-right: 10px;
}

.logo-placeholder img {
    width: 50px;
    height: auto;
}

.logo h1 {
    font-size: 24px;
    font-weight: 700;
    margin: 0;
    color: var(--primary-color);
}

.logo h1 span {
    font-weight: 300;
    color: #9e9e9e;
}

.nav-menu {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-menu li {
    margin: 0 15px;
    position: relative;
}

.nav-menu a {
    color: #333;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
}

.nav-menu a:hover {
    color: var(--primary-color);
}

.dropdown-content {
    display: none;
    position: absolute;
    background-color: white;
    min-width: 160px;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
    z-index: 1;
    padding: 10px 0;
    border-radius: 4px;
    top: 100%;
    left: 0;
}

.dropdown-content a {
    color: #333;
    padding: 10px 15px;
    text-decoration: none;
    display: block;
}

.dropdown-content a:hover {
    background-color: #f1f1f1;
}

.dropdown:hover .dropdown-content {
    display: block;
}

/* 移动端切换按钮 */
.mobile-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--dark-color);
    transition: color 0.3s ease;
}

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

/* 页眉滚动效果 */
header.scrolled {
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

header.scrolled .header-container {
    padding: 10px 0;
}

/* ===== 页脚样式 ===== */
footer {
    background-color: #f8f9fa;
    padding: 80px 0 20px;
    color: var(--dark-color);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 50px;
}

.footer-logo {
    margin-bottom: 20px;
}

.footer-logo h2 {
    font-size: 1.8rem;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.footer-logo p {
    color: var(--gray-color);
}

.footer-links,
.footer-social,
.footer-contact {
    margin-bottom: 20px;
}

.footer-links h3,
.footer-social h3,
.footer-contact h3 {
    font-size: 1.3rem;
    margin-bottom: 25px;
    position: relative;
}

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

.footer-links ul li a {
    color: var(--gray-color);
}

.footer-links ul li a:hover {
    color: var(--primary-color);
    padding-left: 5px;
}

.footer-contact p {
    margin-bottom: 15px;
    display: flex;
    align-items: center;
}

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

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid #e9ecef;
    color: var(--gray-color);
    font-size: 0.9rem;
}

/* 社交链接 */
.social-links {
    display: flex;
    margin-top: 20px;
}

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background-color: #f0f0f0;
    border-radius: 50%;
    margin-right: 10px;
    color: var(--gray-color);
    transition: var(--transition);
}

.social-links a:hover {
    background-color: var(--primary-color);
    color: white;
    transform: translateY(-3px);
}

/* ===== 深色模式 ===== */
body.dark-mode header {
    background-color: var(--dark-color);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.4);
}

body.dark-mode .logo h1 {
    color: #5f9efa;
}

body.dark-mode .logo h1 span {
    color: #aaa;
}

body.dark-mode .nav-menu a {
    color: var(--light-color);
}

body.dark-mode .nav-menu a:hover,
body.dark-mode .nav-menu a.active {
    color: #5f9efa;
}

body.dark-mode .dropdown-content {
    background-color: #333;
}

body.dark-mode .dropdown-content a {
    color: var(--light-color);
}

body.dark-mode .dropdown-content a:hover {
    background-color: rgba(95, 158, 250, 0.2);
}

body.dark-mode .mobile-toggle {
    color: var(--light-color);
}

body.dark-mode footer {
    background-color: #111;
    color: var(--light-color);
}

body.dark-mode .footer-logo h2 {
    color: #5f9efa;
}

body.dark-mode .footer-links ul li a,
body.dark-mode .footer-logo p,
body.dark-mode .footer-bottom {
    color: #aaa;
}

body.dark-mode .social-links a {
    background-color: #333;
    color: #aaa;
}

/* ===== 响应式设计 ===== */
@media (max-width: 1200px) {
    .logo h1 {
        font-size: 1.4rem;
    }
    
    .logo h1 span {
        font-size: 0.8rem;
    }
}

@media (max-width: 992px) {
    .logo-placeholder {
        width: 36px;
        height: 36px;
    }
    
    .logo h1 {
        font-size: 1.3rem;
    }
    
    .logo h1 span {
        font-size: 0.75rem;
    }
    
    .nav-menu li {
        margin: 0 3px;
    }
    
    .nav-menu a {
        padding: 8px 10px;
    }
}

@media (max-width: 768px) {
    body {
        padding-top: 70px;
    }
    
    .header-container {
        padding: 10px 0;
    }
    
    .logo-container {
        height: 40px;
    }
    
    .logo-placeholder {
        width: 32px;
        height: 32px;
    }
    
    .logo h1 {
        font-size: 1.2rem;
    }
    
    .logo h1 span {
        font-size: 0.7rem;
    }
    
    .mobile-toggle {
        display: block;
    }
    
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 300px;
        height: 100vh;
        background-color: white;
        flex-direction: column;
        align-items: flex-start;
        justify-content: flex-start;
        padding: 80px 20px 30px;
        box-shadow: -5px 0 15px rgba(0, 0, 0, 0.1);
        transition: all 0.4s ease;
        overflow-y: auto;
        z-index: 999;
    }
    
    .nav-menu.show {
        right: 0;
    }
    
    .nav-menu li {
        margin: 0;
        width: 100%;
        margin-bottom: 15px;
    }
    
    .nav-menu li a {
        display: block;
        padding: 10px 5px;
        width: 100%;
    }
    
    .dropdown-content {
        position: static;
        visibility: visible;
        opacity: 1;
        transform: none;
        box-shadow: none;
        min-width: auto;
        width: 100%;
        padding: 5px 0 5px 15px;
        display: none;
    }
    
    .dropdown.active .dropdown-content {
        display: block;
    }
    
    .dropdown-content a {
        padding: 8px 15px;
    }
    
    .footer-content {
        gap: 30px;
    }
    
    .footer-links {
        margin-top: 20px;
    }
}

@media (max-width: 480px) {
    .logo-placeholder {
        width: 28px;
        height: 28px;
    }
    
    .logo h1 {
        font-size: 1.1rem;
    }
    
    .logo h1 span {
        font-size: 0.65rem;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
}