/* 全局样式重置与基础设置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

:root {
    --primary-color: #165DFF;
    --primary-dark: #0E42D2;
    --secondary-color: #36CFC9;
    --dark-color: #1D2129;
    --gray-color: #86909C;
    --light-gray: #F2F3F5;
    --white-color: #FFFFFF;
    --danger-color: #F53F3F;
    --success-color: #00B42A;
    --warning-color: #FF7D00;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    --transition: all 0.3s ease;
}

body {
    color: var(--dark-color);
    background-color: var(--white-color);
    line-height: 1.6;
}

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

.section-padding {
    padding: 80px 0;
}

.bg-gray {
    background-color: var(--light-gray);
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: 4px;
    font-size: 16px;
    font-weight: 600;
    text-align: center;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    outline: none;
}

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

.primary-btn:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(22, 93, 255, 0.3);
}

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

.secondary-btn:hover {
    background-color: rgba(22, 93, 255, 0.05);
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(22, 93, 255, 0.1);
}

/* 标题样式 */
.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-header h2 {
    font-size: 32px;
    font-weight: 700;
    color: var(--dark-color);
    margin-bottom: 15px;
    position: relative;
    display: inline-block;
}

.section-header h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background-color: var(--primary-color);
}

.section-header p {
    font-size: 18px;
    color: var(--gray-color);
    max-width: 700px;
    margin: 0 auto;
}

/* 导航栏样式 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: var(--white-color);
    box-shadow: var(--shadow);
    z-index: 9999;
    transition: var(--transition);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

.logo {
    display: flex;
    align-items: center;
    text-decoration: none;
}

.logo-img {
    height: 40px;
    margin-right: 10px;
}

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

.nav-links {
    display: flex;
    gap: 30px;
}

.nav-link {
    text-decoration: none;
    color: var(--dark-color);
    font-size: 16px;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.nav-link:hover, .nav-link.active {
    color: var(--primary-color);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: var(--transition);
}

.nav-link:hover::after, .nav-link.active::after {
    width: 100%;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 24px;
    color: var(--dark-color);
    cursor: pointer;
}

/* 移动端菜单样式 */
.mobile-menu {
    position: fixed;
    top: 80px;
    left: 0;
    right: 0;
    background-color: var(--white-color);
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.05);
    padding: 20px 0;
    display: none;
    z-index: 9998;
}

.mobile-nav-links {
    display: flex;
    flex-direction: column;
    gap: 15px;
    align-items: center;
}

.mobile-nav-link {
    text-decoration: none;
    color: var(--dark-color);
    font-size: 16px;
    font-weight: 500;
    transition: var(--transition);
}

.mobile-nav-link:hover, .mobile-nav-link.active {
    color: var(--primary-color);
}

/* 页脚样式 */
.footer {
    background-color: var(--dark-color);
    color: var(--white-color);
    padding: 60px 0 30px;
}

.footer-top {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
    margin-bottom: 40px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    padding-bottom: 40px;
}

.footer-logo {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.footer-logo .logo-text {
    color: var(--white-color);
    font-size: 22px;
}

.footer-logo p {
    color: var(--gray-color);
    font-size: 14px;
}

.footer-links h4, .footer-contact h4, .footer-social h4 {
    font-size: 18px;
    margin-bottom: 20px;
    position: relative;
    padding-bottom: 10px;
}

.footer-links h4::after, .footer-contact h4::after, .footer-social h4::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 2px;
    background-color: var(--primary-color);
}

.footer-links ul, .footer-contact ul {
    list-style: none;
}

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

.footer-links a, .footer-contact a {
    text-decoration: none;
    color: var(--gray-color);
    transition: var(--transition);
}

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

.footer-contact li {
    display: flex;
    align-items: flex-start;
    gap: 10px;
}

.footer-contact i {
    color: var(--primary-color);
    margin-top: 5px;
}

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

.social-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--white-color);
    font-size: 18px;
    transition: var(--transition);
    text-decoration: none;
}

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

.footer-bottom {
    text-align: center;
    color: var(--gray-color);
    font-size: 14px;
    padding-top: 30px;
}