* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    list-style: none;
    text-decoration: none;
}
:root {
    --main-color: #2979ff;
    --text-color: #333;
    --bg-light: #ffffff;
    --bg-gray: #f5f7fa;
    --card-bg: #fff;
    --border-color: #eee;
    --shadow: 0 4px 15px rgba(0,0,0,0.08);
}
.dark-mode {
    --main-color: #5093ff;
    --text-color: #e5e7eb;
    --bg-light: #121212;
    --bg-gray: #1e1e1e;
    --card-bg: #242424;
    --border-color: #333;
    --shadow: 0 4px 15px rgba(0,0,0,0.3);
}
body {
    font-family: "微软雅黑",sans-serif;
    background: var(--bg-light);
    color: var(--text-color);
    transition: all 0.3s ease;
}
.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
}
.section {
    padding: 70px 0;
}
.bg-gray {
    background: var(--bg-gray);
}
.section-title {
    text-align: center;
    margin-bottom: 50px;
}
.section-title h2 {
    font-size: 30px;
    margin-bottom: 12px;
    position: relative;
    display: inline-block;
}
.section-title h2::after {
    content: '';
    width: 60px;
    height: 3px;
    background: var(--main-color);
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    bottom: -10px;
}
/* LOGO */
.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 22px;
    font-weight: bold;
    color: var(--main-color);
}
.logo-img {
    width: 36px;
    height: 36px;
}
/* 导航 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: var(--card-bg);
    box-shadow: var(--shadow);
    z-index: 999;
}
.nav-wrap {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}
.nav-menu {
    display: flex;
    gap: 30px;
}
.nav-menu a {
    color: var(--text-color);
    transition: 0.3s;
}
.nav-menu a:hover, .nav-menu a.active {
    color: var(--main-color);
}
.theme-switch {
    font-size: 20px;
    cursor: pointer;
}
/* 横幅 */
.banner {
    height: 100vh;
    background: linear-gradient(135deg,#1a237e,#2979ff);
    display: flex;
    align-items: center;
    text-align: center;
    color: #fff;
    padding-top: 70px;
}
.banner-content h1 {
    font-size: 42px;
    margin-bottom: 20px;
}
.banner-content p {
    font-size: 18px;
    margin-bottom: 35px;
    opacity: 0.9;
}
.btn-main {
    display: inline-block;
    padding: 14px 35px;
    background: #fff;
    color: var(--main-color);
    border-radius: 50px;
    font-weight: bold;
    transition: 0.3s;
}
.btn-main:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.2);
}
/* 滚动动画 */
.animate-up {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease;
}
.animate-up.show {
    opacity: 1;
    transform: translateY(0);
}
.delay1 {transition-delay: 0.2s;}
.delay2 {transition-delay: 0.4s;}
/* 服务卡片 */
.service-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill,minmax(300px,1fr));
    gap: 25px;
}
.service-card {
    background: var(--card-bg);
    padding: 30px 25px;
    border-radius: 12px;
    box-shadow: var(--shadow);
    transition: 0.3s;
    border: 1px solid var(--border-color);
}
.service-card:hover {
    transform: translateY(-6px);
}
.service-card h3 {
    margin-bottom: 12px;
    color: var(--main-color);
}
/* 案例 */
.case-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill,minmax(350px,1fr));
    gap: 30px;
}
.case-card {
    background: var(--card-bg);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
}
.case-img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}
.case-info {
    padding: 20px;
}
.case-info h4 {
    margin-bottom: 8px;
}
.case-info span {
    color: var(--main-color);
    font-size: 14px;
}
/* 流程 */
.flow-box {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 20px;
}
.flow-item {
    text-align: center;
    width: 140px;
}
.flow-num {
    width: 45px;
    height: 45px;
    line-height: 45px;
    border-radius: 50%;
    background: var(--main-color);
    color: #fff;
    margin: 0 auto 10px;
    font-weight: bold;
}
/* 表单+验证码 */
.form-wrap {
    max-width: 600px;
    margin: 0 auto;
    background: var(--card-bg);
    padding: 40px;
    border-radius: 12px;
    box-shadow: var(--shadow);
}
.form-item {
    margin-bottom: 20px;
}
.form-item input,.form-item select,.form-item textarea {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--bg-light);
    color: var(--text-color);
    font-size: 15px;
}
.form-item textarea {
    min-height: 120px;
    resize: vertical;
}
.captcha-box {
    display: flex;
    gap:10px;
    align-items: center;
}
#captcha {flex:1;}
.btn-submit {
    width: 100%;
    padding: 13px;
    background: var(--main-color);
    color: #fff;
    border: none;
    border-radius: 6px;
    font-size: 16px;
    cursor: pointer;
    transition: 0.3s;
}
.btn-submit:hover {
    opacity: 0.9;
}
.tip-text {
    text-align: center;
    margin-top: 10px;
}
/* 价格套餐 */
.price-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit,minmax(280px,1fr));
    gap:30px;
}
.price-card {
    background: var(--card-bg);
    border-radius:12px;
    padding:30px;
    text-align:center;
    box-shadow:var(--shadow);
    border:2px solid transparent;
}
.price-card.recommended {
    border-color:var(--main-color);
    transform:scale(1.03);
}
.price-card h3 {
    font-size:24px;
    margin-bottom:15px;
}
.price {
    font-size:32px;
    color:var(--main-color);
    font-weight:bold;
    margin-bottom:15px;
}
.price-card ul {
    text-align:left;
    margin:20px 0;
}
.price-card li {
    padding:8px 0;
    border-bottom:1px solid var(--border-color);
}
/* 博客 */
.blog-list {
    max-width:800px;
    margin:0 auto;
}
.blog-item {
    background:var(--card-bg);
    padding:25px;
    margin-bottom:20px;
    border-radius:10px;
    box-shadow:var(--shadow);
}
.blog-item h3 {
    font-size:22px;
    margin-bottom:10px;
}
.blog-meta {
    color:var(--gray);
    font-size:14px;
    margin-bottom:15px;
}
.blog-content {
    line-height:1.8;
}
/* 底部 */
.footer {
    padding: 40px 0;
    text-align: center;
    background: var(--card-bg);
    border-top: 1px solid var(--border-color);
}
/* 手机适配 */
@media(max-width:768px){
    .nav-menu {display: none;}
    .banner-content h1 {font-size: 28px;}
    .service-grid,.case-grid,.price-grid {grid-template-columns: 1fr;}
    .price-card.recommended {transform:none;}
}