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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: #1a1a1a;
    background: #ffffff;
    overflow-x: hidden;
}

/*图片滚动*/
.swiper {
    width: 560px;
    height: 335px;
}

.swiper-slide {
    text-align: center;
    font-size: 18px;
    background: red;
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 200px;
    background-color: #fff;
    border-radius: 30px;
    cursor: pointer;
}

.swiper-button-prev {
    color: #19B4A6;
}

.swiper-button-next {
    color: #19B4A6;
}

.swiper-button-prev:after,
.swiper-rtl .swiper-button-next:after {
    font-weight: bolder;
}

.swiper-button-next:after,
.swiper-rtl .swiper-button-prev:after {
    font-weight: bolder;
}

.swiper-banner-card {
    width: 100%;
}

.swiper-banner-card-country {
    font-size: 18px;
    /* font-weight: bold; */
    color: #0b7d29;
}

.swiper-banner-card-name {
    font-size: 16px;
    /* font-weight: bolder; */
    color: #000;
    white-space: pre-wrap;
    text-align: center;
    width: 80%;
    line-height: 1.0;
}

.swiper-play-video-view {
    position: absolute;
    bottom: 170px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0.1rem;
    border-radius: 0.1rem;
}

@media screen and (max-width: 750px) {
    .swiper {
        width: 255px;
    }
}

.teacher-modal {
    position: fixed;
    z-index: 9999;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.4);
    display: none;
    justify-content: center;
    align-items: center;
}

.teacher-modal-content {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    background-color: transparent;
    width: 700px;
    border-radius: 20px;
    padding-bottom: 50px;
}

.teacher-modal-content-close {
    position: absolute;
    right: 30px;
    top: 30px;
}

.teacher-img {
    border-radius: 50%;
    width: 320px;
    height: 320px;
    z-index: 1;
    pointer-events: none;
}

.teacher-modal-content-body {
    margin-top: -200px;
    padding-top: 200px;
    display: flex;
    flex-direction: column;
    background-color: #fff;
    width: 350px;
    border-radius: 20px;
}

.teacher-modal-content-body-teacher-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-left: 16px;
    margin-right: 16px;
    margin-top: 20px;
}

.teacher-modal-content-body-teacher-info-name-view {
    display: flex;
    flex-direction: column;
}

.teacher-modal-content-body-teacher-info-name {
    color: #000000;
    font-size: 22px;
    font-weight: bold;
}

.teacher-modal-content-body-teacher-info-country {
    font-weight: 400;
    font-size: 18px;
    color: #259E00;
}

.teacher-modal-content-body-teacher-info-button {
    background: #19B4A6;
    border-radius: 10px;
    padding: 10px 20px 10px 20px;
    color: #fff;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    text-decoration: none;
}

.teacher-modal-content-body-teacher-info-tip {
    font-weight: 400;
    font-size: 14px;
    color: #000000;
    line-height: 1.3;
    background: #EEEEEE;
    border-radius: 10px;
    padding: 16px;
    margin: 20px;
}

/* Navigation */
nav {
    background: linear-gradient(135deg, #19B4A6 0%, #16a395 100%);
    padding: 1.2rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 4px 20px rgba(25, 180, 166, 0.2);
    backdrop-filter: blur(10px);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    color: white;
    font-size: 28px;
    font-weight: 800;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 10px;
    transition: transform 0.3s;
}

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

.logo-icon {
    width: 36px;
    height: 36px;
    background: white;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.nav-links {
    display: flex;
    gap: 2.5rem;
    align-items: center;
}

.nav-links a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    font-size: 16px;
    transition: all 0.3s;
    position: relative;
}

.nav-links a:not(.btn-primary):after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: white;
    transition: width 0.3s;
}

.nav-links a:not(.btn-primary):hover:after {
    width: 100%;
}

.mobile-menu {
    display: none;
    color: white;
    font-size: 28px;
    cursor: pointer;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #F8FBFF 0%, #FFFFFF 50%, #F0F7FF 100%);
    padding: 80px 30px 100px;
    position: relative;
    overflow: hidden;
}

.hero:before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 20% 50%, rgba(74, 144, 226, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(25, 180, 166, 0.06) 0%, transparent 50%);
    pointer-events: none;
}

.hero-content {
    max-width: 1400px;
    margin: 0 auto;
    position: relative;
    z-index: 2;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-text {
    animation: fadeInLeft 0.8s ease-out;
}

.hero-visual {
    animation: fadeInRight 0.8s ease-out;
    display: flex;
    justify-content: center;
    align-items: center;
}

@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }

    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }

    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0px);
    }

    50% {
        transform: translateY(-20px);
    }
}

h1 {
    font-size: 48px;
    color: #2d3748;
    margin-bottom: 24px;
    line-height: 1.2;
    font-weight: 700;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.subtitle {
    font-size: 22px;
    color: #4a5568;
    margin-bottom: 40px;
    line-height: 1.7;
}

.cta-buttons {
    display: flex;
    gap: 20px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.btn-primary {
    background: linear-gradient(135deg, #19B4A6 0%, #16a395 100%);
    color: white;
    padding: 18px 40px;
    border-radius: 50px;
    text-decoration: none;
    font-size: 18px;
    font-weight: 600;
    transition: all 0.3s;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    box-shadow: 0 10px 30px rgba(25, 180, 166, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 40px rgba(25, 180, 166, 0.4);
}

.btn-secondary {
    background: white;
    color: #19B4A6;
    padding: 18px 40px;
    border: 2px solid #19B4A6;
    border-radius: 50px;
    text-decoration: none;
    font-size: 18px;
    font-weight: 600;
    transition: all 0.3s;
    display: inline-flex;
    align-items: center;
    gap: 10px;
}

.btn-secondary:hover {
    background: #19B4A6;
    color: white;
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(25, 180, 166, 0.2);
}

.value-chips {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 40px;
}

.chip {
    background: white;
    padding: 10px 20px;
    border-radius: 20px;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.06);
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    font-weight: 400;
    color: #666;
}

.trust-bar {
    font-size: 15px;
    color: #666;
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 400;
}

.trust-number {
    color: #19B4A6;
    font-weight: 700;
    font-size: 20px;
}

/* Section Styles */
.section {
    padding: 100px 30px;
    max-width: 1400px;
    margin: 0 auto;
}

h2 {
    font-size: 40px;
    color: #2d3748;
    margin-bottom: 20px;
    text-align: center;
    font-weight: 700;
    line-height: 1.2;
}

.section-desc {
    text-align: center;
    color: #4a5568;
    font-size: 18px;
    margin-bottom: 60px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.7;
}

/* Value Cards */
.value-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 40px;
    margin-top: 60px;
}

.value-card {
    background: white;
    padding: 50px 40px;
    border-radius: 24px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.08);
    text-align: center;
    transition: all 0.4s;
    position: relative;
    overflow: hidden;
}

.value-card:before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 6px;
    background: linear-gradient(90deg, #19B4A6, #16a395);
    transform: scaleX(0);
    transition: transform 0.4s;
}

.value-card:hover:before {
    transform: scaleX(1);
}

.value-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 60px rgba(25, 180, 166, 0.15);
}

.card-icon {
    margin-bottom: 30px;
    display: flex;
    justify-content: center;
}

.card-title {
    font-size: 24px;
    color: #2d3748;
    margin-bottom: 18px;
    font-weight: 700;
}

.card-desc {
    color: #666;
    line-height: 1.8;
    font-size: 17px;
}

/* Demo Section */
.demo-section {
    background: linear-gradient(135deg, #f8f9fa 0%, #e8f4f3 100%);
    padding: 100px 30px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.demo-container {
    max-width: 1000px;
    margin: 0 auto;
    position: relative;
    z-index: 2;
}

.demo-container-svg {
    margin: 0 auto 20px; display: block; animation: float 6s ease-in-out infinite;
}
@media screen and (max-width: 750px) {
    .demo-container-svg {
        margin: 0 auto 20px; display: block; animation: float 6s ease-in-out infinite;
        transform-origin: 50% 50%;          /* 设置锚点为中心 */
        transform-box: fill-box;
        width: 100%;
        height: 100%;
    }
}

.demo-link {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    margin-top: 40px;
    background: linear-gradient(135deg, #19B4A6 0%, #16a395 100%);
    color: white;
    padding: 20px 50px;
    border-radius: 50px;
    text-decoration: none;
    font-size: 20px;
    font-weight: 600;
    transition: all 0.3s;
    box-shadow: 0 10px 30px rgba(25, 180, 166, 0.3);
}

.demo-link:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 40px rgba(25, 180, 166, 0.4);
}

.micro-text {
    color: #999;
    font-size: 15px;
    margin-top: 20px;
}

/* Certificate Section */
.certificate-section {
    text-align: center;
    padding: 100px 30px;
    max-width: 1400px;
    margin: 0 auto;
    background: linear-gradient(135deg, #ffffff 0%, #f8fffe 100%);
}

.certificate-section-svg {
    margin: 40px auto; display: block;
}
@media screen and (max-width: 750px) {
    .certificate-section-svg {
        margin: 40px auto; display: block;
        transform-origin: 50% 50%;
        transform-box: fill-box;
        width: 100%;
        height: 100%;
    }
}

.trust-points {
    display: flex;
    gap: 40px;
    justify-content: center;
    margin-top: 50px;
    flex-wrap: wrap;
}

.trust-point {
    display: flex;
    align-items: center;
    gap: 10px;
    color: #666;
    font-size: 14px;
    padding: 12px 20px;
    background: white;
    border-radius: 50px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
    transition: all 0.3s;
}

.trust-point:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(25, 180, 166, 0.15);
}

/* Accent Cards */
.accent-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 30px;
    margin-top: 50px;
}

.accent-card {
    background: white;
    padding: 20px 15px;
    border-radius: 20px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
    text-align: center;
    text-decoration: none;
    color: #333;
    transition: all 0.3s;
    position: relative;
    overflow: hidden;
}

.accent-card:before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(25, 180, 166, 0.05) 0%, transparent 100%);
    opacity: 0;
    transition: opacity 0.3s;
}

.accent-card:hover:before {
    opacity: 1;
}

.accent-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 50px rgba(25, 180, 166, 0.15);
}

.accent-icon {
    margin-bottom: 20px;
}

.accent-name {
    font-size: 18px;
    font-weight: 600;
    color: #1a1a1a;
}

/* Testimonials */
.testimonials-section {
    background: linear-gradient(135deg, #f8f9fa 0%, #e8f4f3 100%);
    padding: 100px 30px;
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 40px;
    max-width: 1400px;
    margin: 0 auto;
    margin-top: 60px;
}

.testimonial {
    background: white;
    padding: 40px;
    border-radius: 20px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
    transition: all 0.3s;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.testimonial-header {
    display: flex;
    align-items: center;
    gap: 15px;
}

.testimonial-avatar {
    flex-shrink: 0;
}

.testimonial:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 50px rgba(0, 0, 0, 0.12);
}

.stars {
    color: #FFD700;
    font-size: 24px;
    margin-bottom: 20px;
}

.testimonial-text {
    color: #333;
    font-style: italic;
    margin-bottom: 20px;
    line-height: 1.8;
    font-size: 17px;
}

.testimonial-author {
    color: #666;
    font-size: 15px;
    font-weight: 500;
}

/* FAQ Section */
.faq-section {
    padding: 100px 30px;
    max-width: 1000px;
    margin: 0 auto;
}

.faq-item {
    background: white;
    margin-bottom: 20px;
    border-radius: 16px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
    overflow: hidden;
    transition: all 0.3s;
}

.faq-item:hover {
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
}

.faq-question {
    padding: 28px 32px;
    cursor: pointer;
    font-weight: 600;
    font-size: 17px;
    color: #2d3748;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background 0.3s;
}

.faq-question:hover {
    background: #f8f9fa;
}

.faq-answer {
    padding: 0 32px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s, padding 0.3s;
    color: #666;
    line-height: 1.8;
    font-size: 16px;
}

.faq-item.active .faq-answer {
    padding: 0 32px 28px;
    max-height: 500px;
}

.faq-arrow {
    transition: transform 0.3s;
    font-size: 20px;
    color: #19B4A6;
}

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

/* Footer */
footer {
    background: linear-gradient(135deg, #1a1a1a 0%, #2a2a2a 100%);
    color: white;
    padding: 60px 30px;
    text-align: center;
}

footer p {
    margin-bottom: 10px;
    font-size: 16px;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .cta-buttons {
        justify-content: center;
    }

    .value-chips {
        justify-content: center;
    }

    .trust-bar {
        justify-content: center;
    }
}

@media (max-width: 768px) {
    h1 {
        font-size: 36px;
    }

    h2 {
        font-size: 32px;
    }

    .subtitle {
        font-size: 18px;
    }

    .section-desc {
        font-size: 17px;
    }

    .nav-links {
        display: none;
    }

    .mobile-menu {
        display: block;
    }

    .hero {
        padding: 80px 20px 60px;
    }

    .section-vvv {
        padding: 70px 20px;
    }

    .value-cards {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .accent-cards {
        grid-template-columns: 1fr;
    }

    .language-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .trust-points {
        flex-direction: column;
        align-items: stretch;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 28px;
    }

    h2 {
        font-size: 26px;
    }

    .subtitle {
        font-size: 16px;
    }

    .btn-primary,
    .btn-secondary {
        padding: 16px 32px;
        font-size: 16px;
        width: 100%;
        justify-content: center;
    }

    .trust-number {
        font-size: 28px;
    }

    .value-card {
        padding: 40px 30px;
    }

    .demo-link {
        padding: 18px 40px;
        font-size: 18px;
    }
}