/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: #2d3748;
    background-color: #ffffff;
}

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

/* Header Styles */
.header {
    background: #ffffff;
    color: #2d3748;
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    border-bottom: 1px solid #e2e8f0;
}

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

.logo-link {
    text-decoration: none;
    color: inherit;
    transition: opacity 0.3s ease;
    cursor: pointer;
}

.logo-link:hover {
    opacity: 0.8;
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 600;
    color: #10a37f;
    margin: 0;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-link {
    color: #2d3748;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-link:hover {
    color: #10a37f;
}

.currency {
    background: #10a37f;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    font-weight: 600;
    color: white;
}

/* Hero Section */
.hero {
    background: url('chatgpt-bg.svg') center/cover no-repeat,
                linear-gradient(135deg, #f7fafc 0%, #edf2f7 100%);
    color: #2d3748;
    padding: 6rem 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 70% 30%, rgba(16, 163, 127, 0.03) 0%, transparent 50%);
    pointer-events: none;
}

.hero::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.7);
    pointer-events: none;
    z-index: 1;
}

.hero .container {
    position: relative;
    z-index: 2;
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-bottom: 2rem;
}

.btn {
    padding: 1rem 2rem;
    border: none;
    border-radius: 6px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    letter-spacing: 0;
    text-transform: none;
}

.btn-primary {
    background: #10a37f;
    color: white;
    border-radius: 6px;
    font-weight: 600;
    letter-spacing: 0;
}

.btn-primary:hover {
    background: #0d8968;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(16, 163, 127, 0.3);
}

.btn-secondary {
    background: transparent;
    color: #2d3748;
    border: 2px solid #e2e8f0;
    border-radius: 6px;
    font-weight: 600;
    letter-spacing: 0;
}

.btn-secondary:hover {
    background: #f7fafc;
    border-color: #10a37f;
    color: #10a37f;
    transform: translateY(-1px);
}

.help-text {
    font-size: 1rem;
    margin-bottom: 1rem;
    opacity: 0.9;
}

.contact-info {
    display: flex;
    gap: 2rem;
    justify-content: center;
    flex-wrap: wrap;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.copy-btn {
    background: #f7fafc;
    color: #2d3748;
    border: 1px solid #e2e8f0;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
}

.copy-btn:hover {
    background: #10a37f;
    border-color: #10a37f;
    color: white;
    transform: scale(1.05);
}

/* Stats Section */
.stats {
    padding: 3rem 0;
    background: #ffffff;
    border-bottom: 1px solid #e2e8f0;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    text-align: center;
}

.stat-item {
    padding: 1.5rem;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: #10a37f;
    margin-bottom: 0.5rem;
    line-height: 1;
    animation: countUp 2s ease-out;
}

@keyframes countUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.stat-label {
    font-size: 1rem;
    color: #4a5568;
    font-weight: 500;
}

/* Steps Section */
.steps {
    padding: 4rem 0;
    background: #ffffff;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 3rem;
    color: #2d3748;
}

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

.step {
    text-align: center;
    position: relative;
}

.step-number {
    width: 60px;
    height: 60px;
    background: #10a37f;
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0 auto 1rem;
}

.step-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: #2d3748;
}

.step-description {
    color: #4a5568;
    font-size: 1rem;
    line-height: 1.6;
}

.step-arrow {
    position: absolute;
    top: 30px;
    right: -1rem;
    font-size: 2rem;
    color: #10a37f;
    font-weight: bold;
}

.step:last-child .step-arrow {
    display: none;
}

/* Video Section */
.video-section {
    padding: 4rem 0;
    background: #f7fafc;
}

.section-subtitle {
    text-align: center;
    font-size: 1.2rem;
    color: #4a5568;
    margin-bottom: 3rem;
}

.video-container {
    max-width: 800px;
    margin: 0 auto 2rem;
    border-radius: 12px;
    overflow: hidden;
    position: relative;
    border: 1px solid #e2e8f0;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.video-container video {
    width: 100%;
    height: auto;
    display: block;
    background: #000;
}

.video-container video:focus {
    outline: 2px solid #10a37f;
    outline-offset: 2px;
}

.video-info {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.video-info h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: #2d3748;
}

.video-info p {
    color: #4a5568;
    margin-bottom: 1.5rem;
}

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

.feature {
    background: #e6fffa;
    color: #10a37f;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-weight: 600;
    border: 1px solid #10a37f;
}

/* Why Choose Us */
.why-choose {
    padding: 4rem 0;
    background: #ffffff;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    display: block;
}

.feature-card {
    background: #ffffff;
    padding: 2rem;
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
    border: 1px solid #e2e8f0;
}

.feature-card:hover {
    transform: translateY(-4px);
    border-color: #10a37f;
    box-shadow: 0 8px 25px rgba(16, 163, 127, 0.15);
}

.feature-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: #2d3748;
}

.feature-card p {
    color: #4a5568;
    line-height: 1.6;
}

/* Testimonials Section */
.testimonials {
    padding: 4rem 0;
    background: #f7fafc;
}

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

.testimonial-card {
    background: #ffffff;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    border: 1px solid #e2e8f0;
    transition: all 0.3s ease;
}

.testimonial-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(16, 163, 127, 0.1);
}

.testimonial-content {
    margin-bottom: 1.5rem;
}

.testimonial-content p {
    font-style: italic;
    color: #4a5568;
    line-height: 1.6;
    font-size: 1.1rem;
    margin: 0;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.author-avatar {
    font-size: 2rem;
    width: 50px;
    height: 50px;
    background: #e6fffa;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.author-name {
    font-weight: 600;
    color: #2d3748;
    margin-bottom: 0.25rem;
}

.author-title {
    font-size: 0.9rem;
    color: #10a37f;
    font-weight: 500;
}

/* Trust Section */
.trust {
    padding: 4rem 0;
    background: #f7fafc;
}

.trust-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.trust-card {
    background: #ffffff;
    padding: 2rem;
    border-radius: 12px;
    border-left: 4px solid #10a37f;
    border: 1px solid #e2e8f0;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.trust-card h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: #2d3748;
}

.trust-card ul {
    list-style: none;
}

.trust-card li {
    padding: 0.5rem 0;
    color: #4a5568;
    position: relative;
    padding-left: 1.5rem;
}

.trust-card li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: #10a37f;
    font-weight: bold;
}

.wechat-contact {
    display: flex;
    gap: 1rem;
    align-items: center;
    margin: 1rem 0;
    flex-wrap: wrap;
}

.copy-btn.large {
    font-size: 1.2rem;
    padding: 0.8rem 1.5rem;
    background: #10a37f;
    color: white;
    border: none;
    border-radius: 6px;
}

.copy-text-btn {
    background: #f7fafc;
    color: #2d3748;
    border: 1px solid #e2e8f0;
    padding: 0.8rem 1.5rem;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
}

.copy-text-btn:hover {
    background: #10a37f;
    border-color: #10a37f;
    color: white;
}

.note {
    font-size: 0.9rem;
    color: #718096;
    font-style: italic;
}

/* Pricing Section */
.pricing {
    padding: 4rem 0;
    background: #ffffff;
}

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

.pricing-card {
    background: #ffffff;
    padding: 2rem;
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    position: relative;
    transition: all 0.3s ease;
    border: 1px solid #e2e8f0;
}

.pricing-card:hover {
    transform: translateY(-5px);
}

.pricing-card.recommended {
    border: 2px solid #10a37f;
    transform: scale(1.05);
    box-shadow: 0 8px 25px rgba(16, 163, 127, 0.2);
}

.pricing-card.best-value {
    border: 2px solid #10a37f;
    box-shadow: 0 8px 25px rgba(16, 163, 127, 0.2);
}

.recommended-badge, .best-value-badge {
    position: absolute;
    top: -10px;
    left: 50%;
    transform: translateX(-50%);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 600;
    color: white;
}

.recommended-badge {
    background: #10a37f;
}

.best-value-badge {
    background: #10a37f;
}

.pricing-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: #2d3748;
}

.price {
    font-size: 3rem;
    font-weight: 700;
    color: #10a37f;
    margin-bottom: 0.5rem;
}

.price-subtitle {
    color: #4a5568;
    margin-bottom: 1.5rem;
}

.features-list {
    list-style: none;
    text-align: left;
}

.features-list li {
    padding: 0.5rem 0;
    font-weight: 500;
}

.feature-yes {
    color: #10a37f;
}

.feature-no {
    color: #a0aec0;
}

/* FAQ Section */
.faq {
    padding: 4rem 0;
    background: #f7fafc;
}

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

.faq-item {
    border-bottom: 1px solid #e2e8f0;
    background: #ffffff;
    border-radius: 8px;
    margin-bottom: 1rem;
    overflow: hidden;
}

.faq-question {
    width: 100%;
    background: none;
    border: none;
    padding: 1.5rem;
    text-align: left;
    font-size: 1.1rem;
    font-weight: 600;
    color: #2d3748;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: color 0.3s ease;
}

.faq-question:hover {
    color: #10a37f;
}

.faq-toggle {
    font-size: 1.5rem;
    transition: transform 0.3s ease;
}

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

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.faq-item.active .faq-answer {
    max-height: 200px;
}

.faq-answer p {
    padding: 0 1.5rem 1.5rem;
    color: #4a5568;
    line-height: 1.6;
}

/* Footer */
.footer {
    background: #2d3748;
    color: white;
    padding: 3rem 0 1rem;
    border-top: 1px solid #e2e8f0;
}

.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;
    color: white;
}

.footer-section p, .footer-section li {
    color: #a0aec0;
    margin-bottom: 0.5rem;
}

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

.footer-section a {
    color: #a0aec0;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section a:hover {
    color: #10a37f;
}

.footer-links {
    border-top: 1px solid #555;
    padding-top: 1rem;
    text-align: center;
}

.footer-links a {
    color: #10a37f;
    text-decoration: none;
    margin: 0 1rem;
}

.footer-links a:hover {
    text-decoration: underline;
}

/* Toast Notification */
.toast {
    position: fixed;
    top: 20px;
    right: 20px;
    background: #10a37f;
    color: white;
    padding: 1rem 1.5rem;
    border-radius: 8px;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transform: translateX(400px);
    transition: transform 0.3s ease;
    z-index: 1000;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.toast.show {
    transform: translateX(0);
}

.toast-icon {
    font-weight: bold;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .contact-info {
        flex-direction: column;
        gap: 1rem;
    }
    
    .steps-grid {
        grid-template-columns: 1fr;
    }
    
    .step-arrow {
        display: none;
    }
    
    .nav-links {
        gap: 1rem;
    }
    
    .nav-link {
        font-size: 0.9rem;
    }
    
    .pricing-card.recommended {
        transform: none;
    }
    
    .wechat-contact {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .section-title {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .hero {
        padding: 2rem 0;
    }
    
    .hero-title {
        font-size: 1.5rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .btn {
        padding: 0.8rem 1.5rem;
        font-size: 1rem;
        text-transform: none;
    }
    
    .section-title {
        font-size: 1.5rem;
    }
    
    .steps, .video-section, .why-choose, .trust, .pricing, .faq {
        padding: 2rem 0;
    }
}

/* ChatGPT-style animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes gentleFloat {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-2px);
    }
}

.hero-title {
    animation: fadeInUp 0.6s ease-out;
}

.hero-subtitle {
    animation: fadeInUp 0.6s ease-out 0.1s both;
}

.hero-buttons {
    animation: fadeInUp 0.6s ease-out 0.2s both;
}

.contact-info {
    animation: fadeInUp 0.6s ease-out 0.3s both;
}

.step-number {
    animation: gentleFloat 3s ease-in-out infinite;
}

/* ChatGPT-style card hover effects */
.pricing-card:hover,
.feature-card:hover,
.trust-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 25px rgba(16, 163, 127, 0.15);
}

/* ChatGPT-style button hover */
.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(16, 163, 127, 0.3);
}

/* Smooth scrollbar for webkit browsers */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #f7fafc;
}

::-webkit-scrollbar-thumb {
    background: #10a37f;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #0d8968;
}