/* 基础样式 */
:root {
    --primary-color: #4a6bff;
    --secondary-color: #9C27B0;
    --accent-color: #ff6b4a;
    --text-color: #333;
    --light-text: #fff;
    --dark-bg: #1a1a2e;
    --light-bg: #f8f9fa;
    --border-radius: 8px;
    --box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    color: var(--text-color);
    line-height: 1.6;
    overflow-x: hidden;
}

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

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
}

.section-title {
    font-size: 2rem;
    color: #333;
    margin-bottom: 1.5rem;
    position: relative;
    text-align: center;
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 3rem;
    position: relative;
    color: var(--primary-color);
}

.section-title:after {
    content: "";
    display: block;
    width: 80px;
    height: 3px;
    background: #4a6bff;
    margin: 1rem auto;
    content: '';
    display: block;
    width: 80px;
    height: 4px;
    background: var(--accent-color);
    margin: 15px auto;
    border-radius: 2px;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 12px 30px;
    border-radius: var(--border-radius);
    font-weight: 600;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    outline: none;
}

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

.btn-primary:hover {
    background-color: #3a59e0;
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(74, 107, 255, 0.3);
}

.btn-secondary {
    background-color: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-secondary:hover {
    background-color: var(--primary-color);
    color: var(--light-text);
    transform: translateY(-3px);
}

.btn-model {
    background-color: var(--accent-color);
    color: var(--light-text);
    padding: 10px 20px;
    border-radius: var(--border-radius);
    font-weight: 600;
    display: inline-block;
    margin-top: 15px;
    transition: var(--transition);
}

.btn-model:hover {
    background-color: #e55a3d;
    transform: translateY(-2px);
}

/* 导航栏 */
header {
    background-color: rgba(255, 255, 255, 0.95);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    padding: 15px 0;
}

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

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

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

.logo h1 {
    font-size: 1.5rem;
    color: var(--primary-color);
    font-weight: 700;
}

nav ul {
    display: flex;
}

nav ul li {
    margin-left: 30px;
}

nav ul li a {
    font-weight: 600;
    position: relative;
}

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

nav ul li a:hover:after {
    width: 100%;
}

.mobile-toggle {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
}

/* 英雄区域 */
.hero {
    background: linear-gradient(135deg, #4a6bff 0%, #9C27B0 100%);
    color: var(--light-text);
    padding: 150px 0 100px;
    position: relative;
    overflow: hidden;
}

.hero .container {
    display: flex;
    align-items: center;
    position: relative;
    z-index: 2;
}

.hero-content {
    flex: 1;
    padding-right: 50px;
}

.hero-image {
    flex: 1;
    text-align: center;
}

.hero-image img {
    max-width: 100%;
    border-radius: 10px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
    transform: perspective(1000px) rotateY(-15deg);
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero h2 {
    font-size: 1.8rem;
    font-weight: 400;
    margin-bottom: 30px;
    opacity: 0.9;
}

.hero p {
    font-size: 1.2rem;
    margin-bottom: 40px;
    opacity: 0.8;
}

.highlight {
    color: #ffeb3b;
    position: relative;
    display: inline-block;
}

.highlight:after {
    content: '';
    position: absolute;
    bottom: 5px;
    left: 0;
    width: 100%;
    height: 8px;
    background-color: rgba(255, 235, 59, 0.3);
    z-index: -1;
}

.cta-buttons {
    display: flex;
    gap: 20px;
}

.wave-divider {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    overflow: hidden;
    line-height: 0;
}

/* 数据统计 */
.stats {
    background-color: var(--light-bg);
    padding: 80px 0;
}

.stats .container {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
}

.stat-item {
    flex: 1;
    min-width: 200px;
    text-align: center;
    padding: 20px;
}

.stat-item i {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.stat-item h3 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--secondary-color);
}

.stat-item p {
    font-size: 1.1rem;
    color: #666;
}

/* 产品优势 */
.advantages {
    padding: 100px 0;
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.advantage-card {
    background-color: #fff;
    border-radius: var(--border-radius);
    padding: 30px;
    text-align: center;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
}

.advantage-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
}

.advantage-card .icon {
    width: 80px;
    height: 80px;
    background-color: rgba(74, 107, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
}

.advantage-card .icon i {
    font-size: 2rem;
    color: var(--primary-color);
}

.advantage-card h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: var(--primary-color);
}

.advantage-card p {
    color: #666;
}

/* 市场需求 */
.market-demand {
    padding: 100px 0;
    background-color: var(--light-bg);
    position: relative;
    overflow: hidden;
}

.market-demand:before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(74, 107, 255, 0.05) 0%, rgba(156, 39, 176, 0.05) 100%);
    z-index: 0;
}

.demand-container {
    display: flex;
    flex-wrap: wrap;
    gap: 40px;
    position: relative;
    z-index: 1;
}

.demand-left {
    flex: 1;
    min-width: 300px;
}

.demand-right {
    flex: 1;
    min-width: 300px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.demand-chart {
    background-color: #fff;
    border-radius: var(--border-radius);
    padding: 30px;
    box-shadow: var(--box-shadow);
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.chart-container {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    height: 350px;
    margin-bottom: 50px;
    position: relative;
}

.chart-bar {
    width: 22%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    justify-content: flex-end;
}

.bar-fill {
    width: 100%;
    background: linear-gradient(to top, var(--primary-color), var(--secondary-color));
    border-radius: 6px 6px 0 0;
    position: relative;
    transition: height 1.5s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    align-self: flex-end;
}

.bar-fill span {
    color: white;
    font-weight: bold;
    font-size: 1.1rem;
}

.chart-bar p {
    margin-top: 10px;
    text-align: center;
    font-size: 0.9rem;
    color: #555;
    font-weight: 500;
    position: absolute;
    bottom: -30px;
    width: 100%;
}

.chart-caption {
    text-align: center;
    font-weight: 600;
    color: var(--primary-color);
    margin-top: 10px;
}

.demand-card {
    background-color: #fff;
    border-radius: var(--border-radius);
    padding: 25px;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
}

.demand-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
}

.demand-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
}

.demand-icon i {
    font-size: 1.8rem;
    color: white;
}

.demand-card h3 {
    font-size: 1.4rem;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.demand-card p {
    color: #555;
    line-height: 1.6;
}

.demand-card ul {
    padding-left: 5px;
}

.demand-card ul li {
    margin-bottom: 10px;
    display: flex;
    align-items: flex-start;
}

.demand-card ul li i {
    color: var(--accent-color);
    margin-right: 10px;
    margin-top: 3px;
}

/* 单词速记逻辑 */
.word-process {
    padding: 100px 0;
    background-color: #f8f9fa;
}

/* 核心功能 */
.features {
    padding: 100px 0;
    background-color: var(--light-bg);
}

.feature-showcase {
    display: flex;
    flex-direction: column;
    gap: 80px;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 50px;
}

.feature-item.reverse {
    flex-direction: row-reverse;
}

.feature-content {
    flex: 1;
}

.feature-image {
    flex: 1;
    text-align: center;
}

.feature-image img {
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    max-width: 90%;
}

/* 单词速记逻辑 - 五点循环布局 */
.process-cycle {
    margin: 50px auto;
    max-width: 800px;
}

.cycle-step {
    border-radius: 50%;
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: bold;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.cycle-step:nth-child(1) {
    background-color: #4a6bff;
}

.cycle-step:nth-child(2) {
    background-color: #9C27B0;
}

.cycle-step:nth-child(3) {
    background-color: #ff6b4a;
}

.cycle-step:nth-child(4) {
    background-color: #4CAF50;
}

.cycle-step:nth-child(5) {
    background-color: #FFC107;
}

.cycle-container {
    position: relative;
    width: 100%;
    height: 400px;
}

.cycle-step {
    z-index: 1;
    position: absolute;
    width: 80px;
    height: 80px;
    background-color: var(--primary-color);
    border-radius: 50%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: white;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    transition: var(--transition);
}

.cycle-step:hover {
    transform: scale(1.1);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.3);
}

.cycle-step h3 {
    font-size: 1.2rem;
    margin-bottom: 5px;
}

.cycle-step p {
    font-size: 0.8rem;
    opacity: 0.9;
}

.cycle-connector {
    position: absolute;
    top: 65%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 500px;
    height: 400px;
    border: 5px dashed var(--accent-color);
    border-radius: 50%;
}

.cycle-container {
    position: relative;
    width: 100%;
    height: 400px;
    margin: 0 auto;
}

.cycle-step {
    position: absolute;
    width: 160px;
    height: 150px;
    background-color: #fff;
    border-radius: 50%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    text-align: center;
    padding: 20px;
    
}

.cycle-step:nth-child(1) {
    top: 0;
    left: 50%;
    transform: translateX(-50%);

}

.cycle-step:nth-child(2) {
    top: 37%;
    right: 10%;

}

.cycle-step:nth-child(3) {
    bottom: -25%;
    right: 25%;

}

.cycle-step:nth-child(4) {
    bottom: -25%;
    left: 37%;
    transform: translateX(-50%);

}

.cycle-step:nth-child(5) {
    bottom: 25%;
    left: 10%;

}

.cycle-step .step-number {
    width: 40px;
    height: 40px;
    background-color: #ffffff;
    color: #c64848;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    margin-bottom: 10px;
}

.cycle-step h3 {
    font-size: 1.5rem;
    color: #ffffff;
    margin-bottom: 5px;
}

.cycle-step p {
    font-size: 0.9rem;
    color: #ffffff;
}

.feature-content h3 {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.feature-content p {
    margin-bottom: 20px;
    color: #555;
    font-size: 1.1rem;
}

.feature-content ul {
    margin-top: 20px;
}

.feature-content ul li {
    margin-bottom: 10px;
    display: flex;
    align-items: center;
}

.feature-content ul li i {
    color: var(--accent-color);
    margin-right: 10px;
}

/* 合作模式 */
.cooperation {
    padding: 100px 0;
}

.cooperation-models {
    display: flex;
    justify-content: center;
    gap: 30px;
    flex-wrap: wrap;
}

.model-card {
    background-color: #fff;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    overflow: hidden;
    width: 300px;
    transition: var(--transition);
}

.model-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.model-header {
    background-color: var(--primary-color);
    color: var(--light-text);
    padding: 25px 20px;
    text-align: center;
}

.model-card.featured .model-header {
    background-color: var(--secondary-color);
}

.model-header h3 {
    font-size: 1.5rem;
    margin-bottom: 10px;
}

.price {
    font-size: 1.1rem;
}

.price span {
    font-size: 1.3rem;
    font-weight: 700;
}

.model-body {
    padding: 30px 20px;
    text-align: center;
}

.model-body ul {
    text-align: left;
    margin-bottom: 25px;
}

.model-body ul li {
    margin-bottom: 15px;
    display: flex;
    align-items: center;
}

.model-body ul li i {
    color: var(--accent-color);
    margin-right: 10px;
}

/* 盈利分析 */
.profit {
    padding: 100px 0;
    background-color: var(--light-bg);
}

.profit-analysis {
    display: flex;
    align-items: center;
    gap: 50px;
    flex-wrap: wrap;
}

.profit-chart {
    flex: 1;
    min-width: 300px;
}

.profit-details {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    width: 100%;
}

.profit-item {
    background-color: #fff;
    border-radius: var(--border-radius);
    padding: 25px;
    margin-bottom: 0;
    box-shadow: var(--box-shadow);
}

.profit-item h3 {
    display: flex;
    align-items: center;
    color: var(--primary-color);
    margin-bottom: 15px;
    font-size: 1.3rem;
}

.profit-item h3 i {
    margin-right: 10px;
    color: var(--secondary-color);
}

.profit-item p {
    margin-bottom: 10px;
}

.profit-item strong {
    color: var(--accent-color);
}

.profit-calculation {
    background-color: rgba(74, 107, 255, 0.05);
    padding: 15px;
    border-radius: var(--border-radius);
    margin-top: 15px;
}

/* 合作流程 */
.process {
    padding: 100px 0;
}

.process-steps {
    display: flex;
    justify-content: space-between;
    position: relative;
    max-width: 1000px;
    margin: 0 auto;
    flex-wrap: wrap;
}

.process-steps:before {
    content: '';
    position: absolute;
    top: 50px;
    left: 50px;
    right: 50px;
    height: 3px;
    background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
    z-index: 1;
}

.process-step {
    text-align: center;
    position: relative;
    z-index: 2;
    width: 180px;
    margin-bottom: 30px;
}

.step-number {
    width: 40px;
    height: 40px;
    background-color: var(--primary-color);
    color: var(--light-text);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    margin: 0 auto 15px;
}

.step-icon {
    width: 80px;
    height: 80px;
    background-color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 15px;
    box-shadow: var(--box-shadow);
}

.step-icon i {
    font-size: 2rem;
    color: var(--primary-color);
}

.process-step h3 {
    margin-bottom: 10px;
    color: var(--primary-color);
}

/* 合作伙伴 */
.partners {
    padding: 80px 0;
    background-color: var(--light-bg);
}

.partners-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 30px;
    align-items: center;
}

.partner-logo {
    background-color: #fff;
    height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--border-radius);
    padding: 20px;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
}

.partner-logo:hover {
    transform: scale(1.05);
}

.partner-logo img {
    max-height: 60px;
    filter: grayscale(100%);
    transition: var(--transition);
}

.partner-logo:hover img {
    filter: grayscale(0%);
}

/* 常见问题 */
.faq {
    padding: 100px 0;
}

.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background-color: #fff;
    border-radius: var(--border-radius);
    margin-bottom: 20px;
    box-shadow: var(--box-shadow);
    overflow: hidden;
}

.faq-question {
    padding: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    transition: var(--transition);
}

.faq-question h3 {
    font-size: 1.2rem;
    color: var(--primary-color);
}

.faq-question i {
    color: var(--primary-color);
    transition: var(--transition);
}

.faq-answer {
    padding: 0 20px;
    max-height: 0;
    overflow: hidden;
    transition: var(--transition);
}

.faq-item.active .faq-question {
    background-color: rgba(74, 107, 255, 0.05);
}

.faq-item.active .faq-question i {
    transform: rotate(180deg);
}

.faq-item.active .faq-answer {
    padding: 0 20px 20px;
    max-height: 1000px;
}

/* 联系我们 */
.contact {
    padding: 100px 0;
    background-color: var(--light-bg);
}

.contact-container {
    display: flex;
    gap: 50px;
    flex-wrap: wrap;
}

.contact-info {
    flex: 1;
    min-width: 300px;
}

.info-item {
    display: flex;
    align-items: flex-start;
    margin-bottom: 30px;
}

.info-item i {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-right: 20px;
    margin-top: 5px;
}

.info-item h3 {
    margin-bottom: 5px;
    color: var(--primary-color);
}

.contact-form {
    flex: 1;
    min-width: 300px;
    background-color: #fff;
    padding: 30px;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.form-group {
    margin-bottom: 20px;
    width: calc(50% - 10px);
    display: inline-block;
    vertical-align: top;
}

.form-group.full-width {
    width: 100%;
}

.form-group:nth-child(odd) {
    margin-right: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: #555;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid #ddd;
    border-radius: var(--border-radius);
    font-family: inherit;
    font-size: 1rem;
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--primary-color);
    outline: none;
    box-shadow: 0 0 0 3px rgba(74, 107, 255, 0.2);
}

/* 页脚 */
footer {
    background-color: var(--dark-bg);
    color: var(--light-text);
    padding: 80px 0 20px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    margin-bottom: 50px;
}

.footer-logo {
    flex: 1;
    min-width: 250px;
    margin-bottom: 30px;
}

.footer-logo img {
    height: 50px;
    margin-bottom: 15px;
}

.footer-logo h3 {
    margin-bottom: 10px;
    color: var(--primary-color);
}

.footer-logo p {
    opacity: 0.7;
}

.footer-links {
    flex: 2;
    display: flex;
    justify-content: space-around;
    flex-wrap: wrap;
}

.link-group {
    margin-bottom: 30px;
    min-width: 150px;
}

.link-group h4 {
    color: var(--primary-color);
    margin-bottom: 20px;
    font-size: 1.2rem;
}

.link-group ul li {
    margin-bottom: 10px;
}

.link-group ul li a {
    opacity: 0.7;
    transition: var(--transition);
}

.link-group ul li a:hover {
    opacity: 1;
    color: var(--primary-color);
}

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

.social-links a {
    width: 40px;
    height: 40px;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

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

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    opacity: 0.7;
    font-size: 0.9rem;
}

/* 返回顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background-color: var(--primary-color);
    color: var(--light-text);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 999;
}

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

.back-to-top:hover {
    background-color: #3a59e0;
    transform: translateY(-5px);
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .hero h1 {
        font-size: 2.8rem;
    }
    
    .hero h2 {
        font-size: 1.5rem;
    }
    
    .section-title {
    font-size: 2rem;
    color: #333;
    margin-bottom: 1.5rem;
    position: relative;
    text-align: center;
        font-size: 2rem;
    }
    
    .process-steps:before {
        display: none;
    }
    
    .process-steps {
        justify-content: center;
        gap: 30px;
    }
}

@media (max-width: 768px) {
    header {
        padding: 10px 0;
    }
    
    .demand-container {
        flex-direction: column;
    }
    
    .demand-chart {
        margin-bottom: 20px;
    }
    
    .chart-container {
        height: 250px;
    }
    
    .chart-bar p {
        font-size: 0.8rem;
    }
    
    nav {
        position: fixed;
        top: 70px;
        left: 0;
        width: 100%;
        background-color: #fff;
        padding: 20px;
        box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        transform: translateY(-150%);
        transition: var(--transition);
        z-index: 999;
    }
    
    nav.active {
        transform: translateY(0);
    }
    
    nav ul {
        flex-direction: column;
    }
    
    nav ul li {
        margin: 10px 0;
    }
    
    .mobile-toggle {
        display: block;
    }
    
    .hero .container {
        flex-direction: column;
    }
    
    .hero-content {
        padding-right: 0;
        margin-bottom: 50px;
        text-align: center;
    }
    
    .cta-buttons {
        justify-content: center;
    }
    
    .feature-item {
        flex-direction: column;
    }
    
    .feature-item.reverse {
        flex-direction: column;
    }
    
    .feature-content {
        order: 2;
    }
    
    .feature-image {
        order: 1;
        margin-bottom: 30px;
    }
    
    .footer-content {
        flex-direction: column;
    }
    
    .footer-logo {
        text-align: center;
        margin-bottom: 40px;
    }
    
    .footer-links {
        justify-content: space-between;
    }
}

@media (max-width: 576px) {
    .hero h1 {
        font-size: 2.2rem;
    }
    
    .chart-container {
        height: 200px;
    }
    
    .bar-fill span {
        font-size: 0.9rem;
    }
    
    .chart-bar p {
        font-size: 0.7rem;
    }
    
    .demand-card {
        padding: 20px;
    }
    
    .demand-icon {
        width: 50px;
        height: 50px;
    }
    
    .demand-icon i {
        font-size: 1.5rem;
    }
    
    .demand-card h3 {
        font-size: 1.2rem;
    }
    
    .hero h2 {
        font-size: 1.2rem;
    }
    
    .hero p {
        font-size: 1rem;
    }
    
    .cta-buttons {
        flex-direction: column;
        gap: 15px;
    }
    
    .stats .container {
        flex-direction: column;
    }
    
    .stat-item {
        margin-bottom: 30px;
    }
    
    .form-group {
        width: 100%;
    }
    
    .form-group:nth-child(odd) {
        margin-right: 0;
    }
    
    .footer-links {
        flex-direction: column;
    }
    
    .link-group {
        text-align: center;
    }
    
    .social-links {
        justify-content: center;
    }
}

/* 合作好处样式 */
.benefits {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    padding: 80px 0;
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 50px;
}

.benefit-card {
    background: white;
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.benefit-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
}

.benefit-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 20px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: white;
}

.benefit-card h3 {
    color: var(--primary-color);
    margin-bottom: 15px;
    font-size: 1.3rem;
}

.benefit-card p {
    color: #666;
    line-height: 1.6;
}

/* 成功案例样式 */
.success-cases {
    padding: 80px 0;
    background: white;
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
    margin-top: 50px;
}

.case-card {
    background: white;
    border-radius: 15px;
    padding: 30px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    border: 1px solid #e9ecef;
    transition: transform 0.3s ease;
}

.case-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
}

.case-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 2px solid #f1f3f4;
}

.case-header h3 {
    color: var(--primary-color);
    font-size: 1.4rem;
    margin: 0;
}

.case-tag {
    background: linear-gradient(135deg, var(--accent-color), #ff9f43);
    color: white;
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 600;
}

.case-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-bottom: 25px;
}

.stat-item {
    text-align: center;
    padding: 15px;
    background: #f8f9fa;
    border-radius: 10px;
}

.stat-item i {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.stat-number {
    display: block;
    font-size: 1.8rem;
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 5px;
}

.stat-label {
    font-size: 0.9rem;
    color: #666;
}

.case-desc {
    color: #555;
    line-height: 1.6;
    font-size: 0.95rem;
    margin: 0;
}

/* 合作校收益案例样式增强 */
.success-cases {
    background: linear-gradient(135deg, #ffffff 0%, #f8f9fa 100%);
    padding: 80px 0;
    position: relative;
}

.section-subtitle {
    text-align: center;
    color: #666;
    font-size: 1.1rem;
    margin-bottom: 50px;
    font-weight: 400;
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
    gap: 30px;
    margin-bottom: 60px;
}

.case-card {
    background: white;
    border-radius: 20px;
    padding: 30px;
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.08);
    border: 1px solid #f0f0f0;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.case-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.12);
}

.case-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
}

.case-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 25px;
    padding-bottom: 20px;
    border-bottom: 2px solid #f5f5f5;
}

.case-school-info h3 {
    color: var(--primary-color);
    font-size: 1.4rem;
    margin: 0 0 5px 0;
    font-weight: 600;
}

.case-location {
    color: #888;
    font-size: 0.9rem;
    font-weight: 400;
}

.case-tag {
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.case-tag-premium {
    background: linear-gradient(135deg, #ff9f43, #ff6b6b);
    color: white;
}

.case-tag-growth {
    background: linear-gradient(135deg, #4ecdc4, #44a08d);
    color: white;
}

.case-tag-quality {
    background: linear-gradient(135deg, #6c5ce7, #a363d9);
    color: white;
}

.case-stats {
    display: grid;
    grid-template-columns: repeat(3, minmax(60px, 1fr));
    gap: 4px;
    margin-bottom: 15px;
    max-width: 100%;
}

.case-stat-item {
    display: flex;
    align-items: center;
    background: #f8f9fa;
    padding: 4px 3px;
    border-radius: 4px;
    transition: background 0.3s ease;
    min-width: 0;
    max-width: 100%;
    width: 100%;
}

.case-stat-item:hover {
    background: #e9ecef;
}

.case-stat-icon {
    width: 18px;
    height: 18px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 3px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 3px;
    color: white;
    font-size: 0.6rem;
    flex-shrink: 0;
}

.case-stat-content {
    display: flex;
    flex-direction: column;
    min-width: 0;
    flex: 1;
}

.case-stat-number {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--primary-color);
    line-height: 1;
    margin-bottom: 1px;
    overflow: hidden;
    text-overflow: ellipsis;
}

.case-stat-label {
    font-size: 0.55rem;
    color: #666;
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* 优化续费率的显示 */
.case-stat-item:nth-child(3) .case-stat-number {
    color: #28a745; /* 绿色突出显示续费率 */
    font-size: 1.0rem;
}

.case-stat-item:nth-child(3) .case-stat-label {
    color: #28a745;
    font-weight: 600;
    font-size: 0.55rem;
}

.case-stat-icon {
    width: 30px;
    height: 30px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 10px;
    color: white;
    font-size: 0.9rem;
    flex-shrink: 0;
}

.case-stat-content {
    display: flex;
    flex-direction: column;
    min-width: 0;
}

/* 调整卡片内边距和布局 */
.case-card {
    padding: 25px 20px;
}

.case-stats {
    gap: 15px;
    margin-bottom: 20px;
}

.case-stat-item {
    padding: 12px;
}

.case-stat-icon {
    width: 35px;
    height: 35px;
    font-size: 1rem;
    margin-right: 12px;
}

.case-highlights {
    gap: 10px;
    margin-bottom: 15px;
}

.highlight-item {
    padding: 8px 12px;
    font-size: 0.85rem;
}

.case-desc {
    font-size: 0.9rem;
    line-height: 1.5;
}

.case-highlights {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-bottom: 20px;
}

.highlight-item {
    display: flex;
    align-items: center;
    background: rgba(79, 70, 229, 0.08);
    padding: 10px 15px;
    border-radius: 8px;
    font-size: 0.9rem;
    color: var(--primary-color);
    font-weight: 500;
}

.highlight-item i {
    margin-right: 8px;
    font-size: 0.95rem;
}

.case-desc {
    color: #555;
    line-height: 1.6;
    font-size: 0.95rem;
    margin: 0;
    padding-top: 15px;
    border-top: 1px solid #f0f0f0;
}

.cases-summary {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    padding: 40px;
    border-radius: 20px;
    color: white;
    text-align: center;
}

.summary-item {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.summary-item i {
    font-size: 2.5rem;
    margin-bottom: 15px;
    opacity: 0.9;
}

.summary-number {
    font-size: 2.2rem;
    font-weight: 700;
    margin-bottom: 5px;
}

.summary-label {
    font-size: 1rem;
    opacity: 0.9;
    font-weight: 400;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .benefits-grid,
    .cases-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .case-stats {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    .case-stat-item {
        flex-direction: column;
        text-align: center;
        padding: 12px;
    }
    
    .case-stat-icon {
        margin-right: 0;
        margin-bottom: 8px;
    }
    
    .case-stat-number {
        font-size: 1.3rem;
    }
    
    .case-stat-label {
        font-size: 0.7rem;
    }
    
    .case-stat-item:nth-child(3) .case-stat-number {
        font-size: 1.4rem;
    }
    
    .case-card {
        padding: 18px 12px;
    }
    
    .case-stats {
        grid-template-columns: repeat(3, minmax(60px, 1fr));
        gap: 4px;
    }
    
    .case-stat-icon {
        width: 18px;
        height: 18px;
        font-size: 0.6rem;
        margin-right: 3px;
    }
    
    .case-stat-number {
        font-size: 0.85rem;
    }
    
    .case-stat-label {
        font-size: 0.55rem;
    }
    
    .case-stat-item:nth-child(3) .case-stat-number {
        font-size: 0.9rem;
    }
    
    .case-highlights {
        grid-template-columns: 1fr;
    }
    
    .cases-summary {
        grid-template-columns: 1fr;
        gap: 25px;
        padding: 30px 20px;
    }
    
    .benefit-card,
    .case-card {
        padding: 20px;
    }
    
    .benefit-icon {
        width: 60px;
        height: 60px;
        font-size: 1.5rem;
    }
    
    .stat-number {
        font-size: 1.5rem;
    }
    
    .summary-number {
        font-size: 1.8rem;
    }
    
    .summary-item i {
        font-size: 2rem;
    }
    
    .case-header {
        flex-direction: column;
        gap: 10px;
    }
    
    .case-school-info h3 {
        font-size: 1.2rem;
    }
}