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

:root {
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --secondary-color: #10b981;
    --text-dark: #1f2937;
    --text-light: #6b7280;
    --bg-light: #f9fafb;
    --bg-white: #ffffff;
    --border-color: #e5e7eb;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

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

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

/* 导航栏 */
.navbar {
    background: var(--bg-white);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 1rem 0;
}

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

.nav-brand {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
    align-items: center;
}

.nav-menu a {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    transition: color 0.3s;
}

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

.btn-nav {
    background: var(--primary-color);
    color: white !important;
    padding: 0.5rem 1.5rem;
    border-radius: 6px;
    transition: background 0.3s;
}

.btn-nav:hover {
    background: var(--primary-dark);
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--text-dark);
    border-radius: 2px;
    transition: all 0.3s;
}

/* 英雄区域 */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 100px 0;
    text-align: center;
}

.hero-title {
    font-size: 3rem;
    font-weight: bold;
    margin-bottom: 1.5rem;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: 3rem;
    opacity: 0.95;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 4rem;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.stat-item {
    text-align: center;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: bold;
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 1rem;
    opacity: 0.9;
}

.hero-cta {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* 按钮样式 */
.btn {
    padding: 1rem 2rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
    transition: all 0.3s;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.btn-secondary:hover {
    background: transparent;
    color: white;
}

.btn-block {
    width: 100%;
}

/* 核心优势 */
.features {
    padding: 80px 0;
    background: var(--bg-light);
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: var(--text-dark);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
    text-align: center;
    transition: transform 0.3s, box-shadow 0.3s;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.feature-card p {
    color: var(--text-light);
    line-height: 1.8;
}

/* 课程内容 */
.curriculum {
    padding: 80px 0;
    background: white;
}

.curriculum-tabs {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.tab-btn {
    padding: 0.75rem 2rem;
    border: 2px solid var(--border-color);
    background: white;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    transition: all 0.3s;
    color: var(--text-dark);
}

.tab-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

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

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.curriculum-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.curriculum-item {
    display: flex;
    gap: 2rem;
    padding: 2rem;
    background: var(--bg-light);
    border-radius: 12px;
    transition: transform 0.3s;
}

.curriculum-item:hover {
    transform: translateX(10px);
}

.curriculum-number {
    font-size: 3rem;
    font-weight: bold;
    color: var(--primary-color);
    min-width: 60px;
}

.curriculum-content h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

.curriculum-content p {
    color: var(--text-light);
    line-height: 1.8;
}

/* 学员评价 */
.testimonials {
    padding: 80px 0;
    background: var(--bg-light);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.testimonial-card {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
}

.testimonial-rating {
    color: #fbbf24;
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

.testimonial-text {
    color: var(--text-light);
    line-height: 1.8;
    margin-bottom: 1.5rem;
    font-style: italic;
}

.testimonial-author {
    border-top: 1px solid var(--border-color);
    padding-top: 1rem;
}

.author-name {
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 0.25rem;
}

.author-title {
    font-size: 0.875rem;
    color: var(--text-light);
}

/* WhatsApp联系 */
.contact {
    padding: 80px 0;
    background: white;
}

.contact-wrapper {
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
}

.contact-content h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.contact-content p {
    color: var(--text-light);
    margin-bottom: 2rem;
    font-size: 1.25rem;
}

.benefits-list {
    list-style: none;
    text-align: left;
    display: inline-block;
    margin-bottom: 3rem;
}

.benefits-list li {
    padding: 0.75rem 0;
    color: var(--text-dark);
    font-size: 1.125rem;
}

.whatsapp-direct {
    margin-top: 2rem;
}

.btn-whatsapp {
    background: #25D366;
    color: white;
    padding: 1.25rem 3rem;
    border-radius: 12px;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.25rem;
    font-weight: 600;
    transition: all 0.3s;
    box-shadow: 0 4px 6px -1px rgba(37, 211, 102, 0.3);
}

.btn-whatsapp:hover {
    background: #20BA5A;
    transform: translateY(-2px);
    box-shadow: 0 6px 12px -1px rgba(37, 211, 102, 0.4);
}

.btn-whatsapp svg {
    width: 28px;
    height: 28px;
}

.whatsapp-note {
    margin-top: 1.5rem;
    color: var(--text-light);
    font-size: 1rem;
}

/* 页脚 */
.footer {
    background: var(--text-dark);
    color: white;
    padding: 3rem 0 1rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3,
.footer-section h4 {
    margin-bottom: 1rem;
}

.footer-section p {
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.8;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.5rem;
    color: rgba(255, 255, 255, 0.7);
}

.footer-section ul li a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: color 0.3s;
}

.footer-section ul li a:hover {
    color: white;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.7);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 1rem;
        box-shadow: var(--shadow-lg);
    }

    .nav-menu.active {
        display: flex;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .hero-stats {
        gap: 2rem;
    }

    .stat-number {
        font-size: 2rem;
    }

    .section-title {
        font-size: 2rem;
    }


    .curriculum-item {
        flex-direction: column;
        gap: 1rem;
    }

    .curriculum-number {
        min-width: auto;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 60px 0;
    }

    .hero-title {
        font-size: 1.75rem;
    }

    .hero-cta {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }

    .features-grid,
    .testimonials-grid {
        grid-template-columns: 1fr;
    }
}