:root {
    --primary-color: #c53030;
    --accent-color: #e53e3e;
    --text-dark: #1f2937;
    --text-light: #6b7280;
    --bg-light: #f9fafb;
    --border-radius: 8px;
    --box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --transition: all 0.3s ease;
}

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

ul, li {
    list-style: none;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg-light);
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 顶部联系信息栏样式 */
.contact-bar {
    background-color: var(--primary-color);
    color: white;
    padding: 12px 0;
    font-size: 0.9rem;
}

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

.contact-info {
    display: flex;
    gap: 30px;
}

.contact-info span {
    display: flex;
    align-items: center;
    gap: 8px;
}

.social-links {
    display: flex;
    gap: 15px;
}

.social-links a {
    color: white;
    transition: var(--transition);
}

.social-links a:hover {
    color: #e2e8f0;
    transform: translateY(-2px);
}

/* 导航栏样式 */
.navbar {
    background-color: white;
    box-shadow: var(--box-shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 15px 0;
    transition: var(--transition);
}

.navbar.scrolled {
    padding: 10px 0;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

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

.navbar-brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
}

.navbar-brand:hover {
    color: var(--accent-color);
}

.navbar-nav {
    display: flex;
    gap: 10px;
}

.nav-link {
    color: var(--text-dark);
    text-decoration: none;
    padding: 10px 15px;
    border-radius: var(--border-radius);
    transition: var(--transition);
    font-weight: 500;
}

.nav-link:hover {
    color: var(--accent-color);
    background-color: #f3f4f6;
}

.nav-link.active,
.nav-link.show {
    color: inherit !important;
    font-weight: 600;
    position: relative;
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 3px;
    background-color: var(--accent-color);
    border-radius: 3px;
}

.emergency-btn {
    background-color: #dc2626;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: var(--border-radius);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 8px;
}

.emergency-btn:hover {
    background-color: #b91c1c;
    transform: translateY(-2px);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

/* 移动端菜单按钮 */
.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-dark);
}

/* 模态框样式 */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 2000;
    justify-content: center;
    align-items: center;
}

.modal-content {
    background-color: white;
    padding: 30px;
    border-radius: var(--border-radius);
    max-width: 500px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    position: relative;
    animation: modalFadeIn 0.3s ease;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid #e5e7eb;
}

.modal-header h3 {
    color: var(--primary-color);
    margin: 0;
}

.close-modal {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-light);
    transition: var(--transition);
}

.close-modal:hover {
    color: var(--text-dark);
    transform: rotate(90deg);
}

/* 回到顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: var(--primary-color);
    color: white;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background-color: var(--accent-color);
    transform: translateY(-3px);
    box-shadow: 0 6px 15px rgba(0, 0, 0, 0.3);
}

/* 动画效果 */
@keyframes modalFadeIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 响应式设计 */
/* 桌面端优化 */
@media (min-width: 1400px) {
    .container {
        max-width: 1320px;
    }
}

/* 平板和小型桌面端 */
@media (max-width: 1199px) {
    .navbar-brand {
        font-size: 1.2rem;
    }
}

/* 平板端 */
@media (max-width: 991px) {
    /* 导航栏响应式 */
    .menu-toggle {
        display: block;
    }
    
    .navbar-nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: white;
        padding: 20px;
        box-shadow: var(--box-shadow);
        flex-direction: column;
        text-align: center;
    }
    
    .navbar-nav.active {
        display: flex;
    }
    
    .navbar-nav .nav-link {
        padding: 12px 15px;
        font-size: 1rem;
        color: var(--text-dark) !important;
    }
    
    .navbar-nav .nav-link.active {
        background-color: var(--primary-color);
        border-radius: var(--border-radius);
        margin: 0 5px;
    }
    
    .navbar-nav .nav-link.active::after {
        display: none;
    }
    
    .emergency-btn {
        padding: 8px 15px;
        font-size: 0.9rem;
    }
    
    /* 联系栏响应式 */
    .contact-bar {
        padding: 10px 0;
    }
    
    .contact-bar .container {
        flex-direction: column;
        gap: 10px;
    }
    
    .contact-info {
        flex-wrap: wrap;
        justify-content: center;
        gap: 15px;
    }
}

/* 小屏平板和大屏手机 */
@media (max-width: 768px) {
    /* 顶部联系栏响应式 */
    .contact-bar {
        font-size: 0.8rem;
    }
    
    .contact-info span {
        flex-direction: column;
        gap: 4px;
        text-align: center;
    }
    
    .social-links {
        gap: 10px;
    }
}

/* 手机端 */
@media (max-width: 576px) {
    /* 全局响应式 */
    .container {
        padding-left: 15px;
        padding-right: 15px;
    }
    
    /* 导航栏响应式 */
    .navbar {
        padding: 12px 0;
    }
    
    .navbar-brand {
        font-size: 1.1rem;
    }
    
    .emergency-btn {
        padding: 6px 12px;
        font-size: 0.8rem;
        gap: 4px;
    }
}

/* 小屏幕手机 */
@media (max-width: 420px) {
    .navbar-brand {
        font-size: 1rem;
    }
    
    .modal-content {
        padding: 20px;
        margin: 10px;
    }
}