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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    background: #fff;
    box-shadow: 0 0 30px rgba(0, 0, 0, 0.1);
    min-height: 100vh;
}

/* Header */
.header {
    background: #fff;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.logo-icon {
    font-size: 2rem;
}

.logo h1 {
    font-size: 1.5rem;
    color: #2c3e50;
    font-weight: 600;
}

.nav {
    display: flex;
    gap: 2rem;
}

.nav a {
    text-decoration: none;
    color: #666;
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

.nav a:hover {
    color: #667eea;
}

.nav a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -5px;
    left: 0;
    background-color: #667eea;
    transition: width 0.3s ease;
}

.nav a:hover::after {
    width: 100%;
}

/* Hero Section */
.hero {
    padding: 4rem 2rem;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
}

.hero-content {
    max-width: 500px;
}

.hero-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: #2c3e50;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: #666;
    margin-bottom: 2rem;
}

.hero-features {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: #fff;
    padding: 0.5rem 1rem;
    border-radius: 25px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.feature-icon {
    font-size: 1.2rem;
}

.cta-button {
    display: inline-block;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    padding: 1rem 2rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.6);
}

/* CTA group */
.cta-group {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

/* Secondary CTA */
.cta-button.cta-secondary {
    background: linear-gradient(135deg, #2ecc71 0%, #27ae60 100%);
    box-shadow: 0 4px 15px rgba(46, 204, 113, 0.4);
}

.cta-button.cta-secondary:hover {
    box-shadow: 0 6px 20px rgba(46, 204, 113, 0.6);
}

.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.demo-card {
    background: #fff;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
    overflow: hidden;
    width: 300px;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
}

.card-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    padding: 1rem;
    text-align: center;
}

.card-title {
    font-weight: 600;
}

.card-content {
    padding: 1.5rem;
    text-align: center;
}

.code-display {
    background: #f8f9fa;
    border: 2px dashed #ddd;
    padding: 1rem;
    border-radius: 8px;
    font-family: 'Courier New', monospace;
    font-weight: 600;
    color: #667eea;
    margin-bottom: 1rem;
}

.status-indicator {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    color: #28a745;
    font-weight: 500;
}

.status-dot {
    width: 8px;
    height: 8px;
    background: #28a745;
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { opacity: 1; }
    50% { opacity: 0.5; }
    100% { opacity: 1; }
}

/* Features Grid */
.features {
    padding: 4rem 2rem;
    background: #fff;
}

.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-header h2 {
    font-size: 2.2rem;
    color: #2c3e50;
    margin-bottom: 0.5rem;
}

.section-header p {
    font-size: 1.1rem;
    color: #666;
}

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

.feature-card {
    background: #fff;
    padding: 2rem;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

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

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

.feature-card h3 {
    font-size: 1.3rem;
    color: #2c3e50;
    margin-bottom: 1rem;
}

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

/* How to Use */
.how-to-use {
    padding: 4rem 2rem;
    background: #f8f9fa;
}

.steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.step {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    background: #fff;
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
}

.step-number {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 1.2rem;
    flex-shrink: 0;
}

.step-content h3 {
    color: #2c3e50;
    margin-bottom: 0.5rem;
}

.step-content p {
    color: #666;
    line-height: 1.6;
}

.charge-link {
    background: #fff;
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
    text-align: center;
}

.charge-link h3 {
    color: #2c3e50;
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

.link-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.charge-url {
    background: #f8f9fa;
    padding: 1rem 1.5rem;
    border-radius: 8px;
    text-decoration: none;
    color: #667eea;
    font-weight: 600;
    border: 2px solid #e9ecef;
    transition: all 0.3s ease;
}

.charge-url:hover {
    border-color: #667eea;
    background: #e3f2fd;
}

.copy-btn {
    background: #667eea;
    color: #fff;
    border: none;
    padding: 1rem 1.5rem;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    transition: background 0.3s ease;
}

.copy-btn:hover {
    background: #5a6fd8;
}

.link-description {
    color: #666;
    font-style: italic;
}

/* Pricing */
.pricing {
    padding: 4rem 2rem;
    background: #fff;
}

.pricing-info {
    display: flex;
    justify-content: center;
}

.pricing-card {
    background: #fff;
    border-radius: 20px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
    overflow: hidden;
    max-width: 400px;
    width: 100%;
}

.pricing-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    padding: 2rem;
    text-align: center;
}

.pricing-header h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.price {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 0.2rem;
}

.currency {
    font-size: 1.2rem;
}

.amount {
    font-size: 3rem;
    font-weight: 700;
}

.period {
    font-size: 1rem;
    opacity: 0.8;
}

.pricing-features {
    padding: 2rem;
}

.feature {
    padding: 0.5rem 0;
    font-size: 1rem;
}

.pricing-note {
    background: #fff3cd;
    border: 1px solid #ffeaa7;
    padding: 1rem;
    margin: 1rem;
    border-radius: 8px;
    color: #856404;
    text-align: center;
}

/* Warning Section */
.warning {
    background: linear-gradient(135deg, #ff6b6b 0%, #ee5a24 100%);
    color: #fff;
    padding: 2rem;
}

.warning-content {
    display: flex;
    align-items: center;
    gap: 1rem;
    max-width: 800px;
    margin: 0 auto;
}

.warning-icon {
    font-size: 3rem;
    flex-shrink: 0;
}

.warning-text h3 {
    margin-bottom: 0.5rem;
    font-size: 1.3rem;
}

.warning-text p {
    margin-bottom: 0.5rem;
    opacity: 0.95;
}

/* Contact */
.contact {
    padding: 4rem 2rem;
    background: #f8f9fa;
}

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

.contact-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    background: #fff;
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
}

.contact-icon {
    font-size: 2rem;
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.contact-text h4 {
    color: #2c3e50;
    margin-bottom: 0.5rem;
}

.contact-text p {
    color: #666;
}

/* Footer */
.footer {
    background: #2c3e50;
    color: #ecf0f1;
    padding: 3rem 2rem 1rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h4 {
    margin-bottom: 1rem;
    color: #fff;
}

.footer-section p {
    opacity: 0.8;
    line-height: 1.6;
}

.footer-bottom {
    border-top: 1px solid #34495e;
    padding-top: 1rem;
    text-align: center;
    opacity: 0.7;
}

/* Responsive Design */
@media (max-width: 768px) {
    .header {
        flex-direction: column;
        gap: 1rem;
        padding: 1rem;
    }

    .nav {
        gap: 1rem;
    }

    .hero {
        grid-template-columns: 1fr;
        padding: 2rem 1rem;
        text-align: center;
    }

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

    .hero-features {
        justify-content: center;
    }

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

    .step {
        flex-direction: column;
        text-align: center;
    }

    .link-container {
        flex-direction: column;
    }

    .charge-url {
        word-break: break-all;
    }

    .warning-content {
        flex-direction: column;
        text-align: center;
    }

    .contact-item {
        flex-direction: column;
        text-align: center;
    }

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .nav {
        flex-wrap: wrap;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.8rem;
    }
    
    .section-header h2 {
        font-size: 1.8rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .pricing-card {
        margin: 0 1rem;
    }
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.feature-card,
.step,
.contact-item {
    animation: fadeInUp 0.6s ease forwards;
}

.feature-card:nth-child(2) { animation-delay: 0.1s; }
.feature-card:nth-child(3) { animation-delay: 0.2s; }
.feature-card:nth-child(4) { animation-delay: 0.3s; }

/* Utility Classes */
.text-center {
    text-align: center;
}

.mt-2 {
    margin-top: 1rem;
}

.mb-2 {
    margin-bottom: 1rem;
}

/* Copy notification */
.copy-notification {
    position: fixed;
    top: 20px;
    right: 20px;
    background: #28a745;
    color: #fff;
    padding: 1rem 1.5rem;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    z-index: 1000;
    transform: translateX(100%);
    transition: transform 0.3s ease;
}

.copy-notification.show {
    transform: translateX(0);
} 

/* Quick Info */
.quick-info {
    background: #fff;
    border-top: 1px solid #f0f0f0;
    border-bottom: 1px solid #f0f0f0;
    padding: 1.25rem 2rem;
}

.quick-list {
    max-width: 1000px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1rem 2rem;
    list-style: none;
}

.quick-list li {
    background: #f8f9fa;
    border: 1px solid #eef2f7;
    border-radius: 10px;
    padding: 0.75rem 1rem;
    color: #2c3e50;
}

.quick-list a {
    color: #667eea;
    text-decoration: none;
    font-weight: 600;
}

.quick-list a:hover {
    text-decoration: underline;
}