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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    overflow-x: hidden;
}

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

/* Header Styles */
.header {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.nav-brand {
    display: flex;
    align-items: center;
    font-size: 1.5rem;
    font-weight: 700;
    color: #667eea;
    text-decoration: none;
}

.nav-brand i {
    margin-right: 0.5rem;
    font-size: 2rem;
}

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

.nav-link {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

.nav-link:hover {
    color: #667eea;
}

.nav-link::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -5px;
    left: 50%;
    background: #667eea;
    transition: all 0.3s ease;
    transform: translateX(-50%);
}

.nav-link:hover::after {
    width: 100%;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: #333;
    margin: 3px 0;
    transition: 0.3s;
}

/* Floating CTA Button */
.floating-cta {
    position: fixed;
    bottom: 30px;
    right: 30px;
    z-index: 999;
    opacity: 0;
    transform: translateY(100px);
    transition: all 0.3s ease;
}

.floating-cta.show {
    opacity: 1;
    transform: translateY(0);
}

.floating-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: linear-gradient(135deg, #ff6b6b, #ee5a24);
    color: white;
    padding: 1rem 1.5rem;
    border-radius: 50px;
    text-decoration: none;
    box-shadow: 0 4px 15px rgba(255, 107, 107, 0.4);
    transition: all 0.3s ease;
}

.floating-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(255, 107, 107, 0.4);
}

/* Scroll to Top Button */
.scroll-top {
    position: fixed;
    bottom: 30px;
    left: 30px;
    width: 50px;
    height: 50px;
    background: #667eea;
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    opacity: 0;
    transform: translateY(100px);
    transition: all 0.3s ease;
    z-index: 998;
}

.scroll-top.show {
    opacity: 1;
    transform: translateY(0);
}

.scroll-top:hover {
    background: #5a6fd8;
    transform: translateY(-2px);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
}

.crypto-icon {
    position: absolute;
    font-size: 3rem;
    color: rgba(255, 255, 255, 0.1);
    animation: float 6s ease-in-out infinite;
}

.crypto-icon.btc {
    top: 20%;
    left: 10%;
    animation-delay: 0s;
}

.crypto-icon.eth {
    top: 60%;
    right: 15%;
    animation-delay: 2s;
}

.crypto-icon.crypto1 {
    top: 80%;
    left: 20%;
    animation-delay: 1s;
}

.crypto-icon.crypto2 {
    top: 30%;
    right: 30%;
    animation-delay: 3s;
}

.crypto-icon.crypto3 {
    top: 50%;
    left: 80%;
    animation-delay: 4s;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-20px);
    }
}

.hero-content {
    text-align: center;
    color: white;
    z-index: 1;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, #fff, #f0f8ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.3rem;
    margin-bottom: 3rem;
    opacity: 0.9;
}

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

.code-card {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 2rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

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

.code-logo img {
    width: 60px;
    height: 60px;
    border-radius: 10px;
}

.code-info h3 {
    color: #333;
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

.code-value {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.code-value span {
    font-family: 'Courier New', monospace;
    font-size: 1.2rem;
    font-weight: 600;
    color: #667eea;
    padding: 0.5rem 1rem;
    background: rgba(102, 126, 234, 0.1);
    border-radius: 8px;
}

.copy-btn {
    background: #667eea;
    color: white;
    border: none;
    padding: 0.5rem;
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
}

.copy-btn:hover {
    background: #5a6fd8;
    transform: scale(1.1);
}

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

/* Button Styles */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    background: linear-gradient(135deg, #f093fb, #f5576c);
    color: white;
    box-shadow: 0 4px 15px rgba(240, 147, 251, 0.4);
}

.btn-secondary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(240, 147, 251, 0.4);
}

/* Section Styles */
section {
    padding: 5rem 0;
}

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

/* Why Us Section */
.why-us {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
}

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

.benefit-card {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 2rem;
    text-align: center;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.benefit-card:hover {
    transform: translateY(-10px);
}

.benefit-icon {
    background: linear-gradient(135deg, #667eea, #764ba2);
    width: 80px;
    height: 80px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
    color: white;
    font-size: 2rem;
}

.benefit-card h3 {
    color: #333;
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

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

/* Exchange Sections */
.exchange-section {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    margin: 2rem 0;
    border-radius: 30px;
}

.binance-section {
    background: linear-gradient(135deg, rgba(240, 185, 11, 0.1), rgba(255, 255, 255, 0.95));
}

.okx-section {
    background: linear-gradient(135deg, rgba(0, 102, 255, 0.1), rgba(255, 255, 255, 0.95));
}

.exchange-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: start;
}

.exchange-info {
    color: #333;
}

.exchange-logo img {
    width: 100px;
    height: 100px;
    border-radius: 20px;
    margin-bottom: 1rem;
}

.exchange-info h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: #333;
}

.exchange-desc {
    font-size: 1.1rem;
    color: #666;
    margin-bottom: 2rem;
}

.invite-code-display {
    background: rgba(255, 255, 255, 0.8);
    border-radius: 15px;
    padding: 1.5rem;
    margin-bottom: 2rem;
}

.invite-code-display h3 {
    margin-bottom: 1rem;
    color: #333;
}

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

.code-display .code {
    font-family: 'Courier New', monospace;
    font-size: 1.5rem;
    font-weight: 700;
    color: #667eea;
    padding: 0.8rem 1.5rem;
    background: rgba(102, 126, 234, 0.1);
    border-radius: 10px;
    border: 2px dashed #667eea;
}

.benefits-list {
    margin-bottom: 2rem;
}

.benefits-list h3 {
    margin-bottom: 1rem;
    color: #333;
}

.benefits-list ul {
    list-style: none;
}

.benefits-list li {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
    color: #666;
}

.benefits-list .fa-check {
    color: #28a745;
}

.registration-steps h3 {
    margin-bottom: 2rem;
    color: #333;
}

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

.step {
    display: flex;
    align-items: start;
    gap: 1rem;
}

.step-number {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    flex-shrink: 0;
}

.step-content h4 {
    color: #333;
    margin-bottom: 0.5rem;
}

.step-content p {
    color: #666;
    font-size: 0.9rem;
}

/* Comparison Table */
.comparison {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
}

.comparison-table {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

.comparison-table table {
    width: 100%;
    border-collapse: collapse;
}

.comparison-table th,
.comparison-table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
}

.comparison-table th {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    font-weight: 600;
}

.comparison-table tr:nth-child(even) {
    background: rgba(102, 126, 234, 0.05);
}

/* Articles Section */
.articles {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    margin: 2rem 0;
    border-radius: 30px;
}

.articles .section-title {
    color: #333;
}

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

.article-card {
    background: white;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.article-card:hover {
    transform: translateY(-10px);
}

.article-image img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.article-content {
    padding: 1.5rem;
}

.article-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 1rem;
    font-size: 0.8rem;
}

.article-category {
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-weight: 500;
    color: white;
}

.trading-guide {
    background: #28a745;
}

.exchange-review {
    background: #007bff;
}

.tips-tricks {
    background: #ffc107;
    color: #333;
}

.security {
    background: #dc3545;
}

.defi {
    background: #6f42c1;
}

.market-analysis {
    background: #17a2b8;
}

.article-date,
.article-read-time {
    color: #666;
}

.article-title {
    color: #333;
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.article-excerpt {
    color: #666;
    margin-bottom: 1rem;
    line-height: 1.6;
}

.article-link {
    color: #667eea;
    text-decoration: none;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: color 0.3s ease;
}

.article-link:hover {
    color: #5a6fd8;
}

/* FAQ Section */
.faq {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
}

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

.faq-item {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 15px;
    margin-bottom: 1rem;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.faq-question {
    padding: 1.5rem;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background 0.3s ease;
}

.faq-question:hover {
    background: rgba(102, 126, 234, 0.05);
}

.faq-question h3 {
    color: #333;
    font-size: 1.1rem;
}

.faq-question i {
    color: #667eea;
    transition: transform 0.3s ease;
}

.faq-item.active .faq-question i {
    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: #666;
    line-height: 1.6;
}

/* Newsletter Section */
.newsletter {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
}

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

.newsletter-info h2 {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.newsletter-info p {
    margin-bottom: 2rem;
    opacity: 0.9;
}

.newsletter-form {
    margin-bottom: 2rem;
}

.form-group {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
}

.form-group input {
    flex: 1;
    padding: 1rem;
    border: none;
    border-radius: 50px;
    font-size: 1rem;
    outline: none;
}

.form-message {
    font-size: 0.9rem;
    margin-top: 0.5rem;
}

.social-links p {
    margin-bottom: 1rem;
    opacity: 0.8;
}

.social-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.8rem 1.5rem;
    background: rgba(255, 255, 255, 0.2);
    color: white;
    text-decoration: none;
    border-radius: 50px;
    margin: 0 0.5rem;
    transition: all 0.3s ease;
}

.social-link:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-2px);
}

/* Footer */
.footer {
    background: rgba(0, 0, 0, 0.9);
    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-brand {
    display: flex;
    align-items: center;
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.footer-brand i {
    margin-right: 0.5rem;
    color: #667eea;
}

.footer-section p {
    margin-bottom: 1rem;
    opacity: 0.8;
    line-height: 1.6;
}

.footer-section h3 {
    margin-bottom: 1rem;
    color: #667eea;
}

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

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section ul li a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section ul li a:hover {
    color: #667eea;
}

.footer-social {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
}

.footer-social a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: #667eea;
    color: white;
    border-radius: 50%;
    text-decoration: none;
    transition: all 0.3s ease;
}

.footer-social a:hover {
    background: #5a6fd8;
    transform: translateY(-2px);
}

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

.footer-disclaimer {
    background: rgba(255, 193, 7, 0.1);
    border: 1px solid rgba(255, 193, 7, 0.3);
    border-radius: 10px;
    padding: 1rem;
    margin-bottom: 1rem;
    color: #ffc107;
}

.footer-copyright {
    opacity: 0.6;
    font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: rgba(255, 255, 255, 0.95);
        backdrop-filter: blur(10px);
        flex-direction: column;
        justify-content: start;
        padding: 2rem;
        transition: left 0.3s ease;
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-toggle.active span:nth-child(1) {
        transform: rotate(-45deg) translate(-5px, 6px);
    }

    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }

    .nav-toggle.active span:nth-child(3) {
        transform: rotate(45deg) translate(-5px, -6px);
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1.1rem;
    }

    .hero-codes {
        grid-template-columns: 1fr;
    }

    .hero-cta {
        flex-direction: column;
        align-items: center;
    }

    .exchange-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .form-group {
        flex-direction: column;
    }

    .floating-cta,
    .scroll-top {
        bottom: 20px;
    }

    .floating-cta {
        right: 20px;
    }

    .scroll-top {
        left: 20px;
    }

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

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

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }

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

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

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

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

    .comparison-table {
        font-size: 0.9rem;
    }

    .comparison-table th,
    .comparison-table td {
        padding: 0.8rem;
    }
}

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

.animate-fade-in-up {
    animation: fadeInUp 0.8s ease forwards;
}

/* Smooth scrolling */
html {
    scroll-behavior: smooth;
}

/* Custom scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: #667eea;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #5a6fd8;
}