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

body {
    font-family: 'Poppins', sans-serif;
    background: #0d1117;
    color: #e6edf3;
    line-height: 1.6;
    overflow-x: hidden;
}

/* Particles Background */
#particles-js {
    position: fixed;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    z-index: -1;
}

/* Header */
.header {
    position: sticky;
    top: 0;
    width: 100%;
    background: rgba(13, 17, 23, 0.9);
    backdrop-filter: blur(12px);
    z-index: 1000;
    border-bottom: 1px solid rgba(48, 54, 61, 0.2);
    transition: all 0.3s ease;
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.2rem 2rem;
}

.logo {
    font-size: 1.6rem;
    font-weight: 700;
    color: #58a6ff;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo i {
    color: #7c3aed;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2.5rem;
    align-items: center;
}

.nav-link {
    color: #8b949e;
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    transition: all 0.3s ease;
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: #58a6ff;
    background: rgba(88, 166, 255, 0.1);
}

.nav-cta {
    background: linear-gradient(135deg, #58a6ff, #7c3aed);
    color: white;
    padding: 0.7rem 1.5rem;
    border-radius: 10px;
    font-weight: 600;
    box-shadow: 0 4px 15px rgba(88, 166, 255, 0.3);
}

.nav-cta:hover {
    background: linear-gradient(135deg, #4493f8, #6d28d9);
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(88, 166, 255, 0.4);
}

/* Main Content */
.main-content {
    min-height: 100vh;
    position: relative;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

/* Page Header */
.page-header {
    text-align: center;
    padding: 4rem 0 3rem;
    position: relative;
}

.page-title {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    font-weight: 700;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, #58a6ff, #7c3aed, #f97316);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.page-subtitle {
    font-size: 1.2rem;
    color: #8b949e;
    max-width: 700px;
    margin: 0 auto 2rem;
    line-height: 1.7;
}

.breadcrumb {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    color: #6e7681;
    font-size: 0.9rem;
    margin-bottom: 2rem;
}

.breadcrumb span {
    color: #58a6ff;
}

/* Payment Section */
.payment-section {
    max-width: 800px;
    margin: 0 auto;
}

.payment-intro {
    background: rgba(22, 27, 34, 0.6);
    border: 1px solid rgba(48, 54, 61, 0.4);
    border-radius: 16px;
    padding: 2rem;
    margin-bottom: 3rem;
    text-align: center;
    backdrop-filter: blur(8px);
}

.payment-intro h3 {
    color: #f0f6fc;
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.payment-intro p {
    color: #8b949e;
    line-height: 1.6;
}

/* Payment Methods */
.payment-methods {
    margin-bottom: 3rem;
}

.methods-title {
    font-size: 1.8rem;
    font-weight: 600;
    color: #f0f6fc;
    text-align: center;
    margin-bottom: 2rem;
}

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

.payment-card {
    background: rgba(22, 27, 34, 0.8);
    border: 1px solid rgba(48, 54, 61, 0.4);
    border-radius: 16px;
    padding: 2rem;
    transition: all 0.4s ease;
    position: relative;
    overflow: hidden;
}

.payment-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.payment-card.banking::before {
    background: linear-gradient(90deg, #3b82f6, #1d4ed8);
}

.payment-card.momo::before {
    background: linear-gradient(90deg, #d946ef, #9333ea);
}

.payment-card.zalopay::before {
    background: linear-gradient(90deg, #06b6d4, #0891b2);
}

.payment-card:hover {
    transform: translateY(-5px);
    border-color: rgba(88, 166, 255, 0.3);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.2);
}

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

.payment-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.payment-icon {
    width: 50px;
    height: 50px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: white;
}

.payment-icon.banking {
    background: linear-gradient(135deg, #3b82f6, #1d4ed8);
}

.payment-icon.momo {
    background: linear-gradient(135deg, #d946ef, #9333ea);
}

.payment-icon.zalopay {
    background: linear-gradient(135deg, #06b6d4, #0891b2);
}

.payment-title {
    font-size: 1.3rem;
    font-weight: 600;
    color: #f0f6fc;
}

.account-info {
    margin-bottom: 1.5rem;
}

.info-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 0;
    border-bottom: 1px solid rgba(48, 54, 61, 0.3);
}

.info-row:last-child {
    border-bottom: none;
}

.info-label {
    color: #8b949e;
    font-size: 0.9rem;
}

.info-value {
    color: #f0f6fc;
    font-weight: 600;
    font-size: 1rem;
}

.copy-button {
    background: linear-gradient(135deg, #58a6ff, #7c3aed);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-family: 'Poppins', sans-serif;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    width: 100%;
    justify-content: center;
}

.copy-button:hover {
    background: linear-gradient(135deg, #4493f8, #6d28d9);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(88, 166, 255, 0.4);
}

.copy-button.copied {
    background: linear-gradient(135deg, #10b981, #059669);
}

/* Instructions */
.payment-instructions {
    background: rgba(22, 27, 34, 0.6);
    border: 1px solid rgba(48, 54, 61, 0.4);
    border-radius: 16px;
    padding: 2rem;
    margin-bottom: 3rem;
}

.instructions-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: #f0f6fc;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.instruction-steps {
    display: grid;
    gap: 1.5rem;
}

.instruction-step {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 1rem;
    background: rgba(30, 41, 59, 0.4);
    border-radius: 12px;
    border: 1px solid rgba(71, 85, 105, 0.3);
}

.step-number {
    width: 30px;
    height: 30px;
    background: linear-gradient(135deg, #58a6ff, #7c3aed);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.9rem;
    flex-shrink: 0;
}

.step-content {
    flex: 1;
}

.step-title {
    color: #f0f6fc;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.step-description {
    color: #8b949e;
    font-size: 0.9rem;
}

/* Contact Section */
.contact-section {
    background: linear-gradient(135deg, rgba(88, 166, 255, 0.1), rgba(124, 58, 237, 0.1));
    border: 1px solid rgba(88, 166, 255, 0.2);
    border-radius: 16px;
    padding: 2rem;
    text-align: center;
}

.contact-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: #f0f6fc;
    margin-bottom: 1rem;
}

.contact-subtitle {
    color: #8b949e;
    margin-bottom: 2rem;
}

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

.contact-btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-family: 'Poppins', sans-serif;
    font-weight: 600;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.3s ease;
    cursor: pointer;
}

.contact-btn.zalo {
    background: linear-gradient(135deg, #0068ff, #0052cc);
    color: white;
}

.contact-btn.zalo:hover {
    background: linear-gradient(135deg, #0052cc, #003d99);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 104, 255, 0.4);
}

.contact-btn.telegram {
    background: linear-gradient(135deg, #0088cc, #006699);
    color: white;
}

.contact-btn.telegram:hover {
    background: linear-gradient(135deg, #006699, #004466);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 136, 204, 0.4);
}

/* Footer */
.footer {
    background: rgba(13, 17, 23, 0.9);
    border-top: 1px solid rgba(48, 54, 61, 0.3);
    padding: 4rem 0 2rem;
    margin-top: 5rem;
}

.footer-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-section h3 {
    color: #f0f6fc;
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
}

.footer-section p,
.footer-section a {
    color: #8b949e;
    text-decoration: none;
    line-height: 1.8;
    transition: color 0.3s ease;
}

.footer-section a:hover {
    color: #58a6ff;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 0.75rem;
}

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

.social-link {
    width: 40px;
    height: 40px;
    background: rgba(48, 54, 61, 0.5);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #8b949e;
    transition: all 0.3s ease;
}

.social-link:hover {
    background: rgba(88, 166, 255, 0.2);
    color: #58a6ff;
    transform: translateY(-2px);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(48, 54, 61, 0.3);
    color: #6e7681;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.footer-logo i {
    color: #58a6ff;
    font-size: 1.5rem;
}

.footer-logo span {
    color: #f0f6fc;
    font-size: 1.3rem;
    font-weight: 700;
}

/* Mobile Responsive */
.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    color: #8b949e;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.mobile-menu-toggle:hover {
    color: #58a6ff;
    background: rgba(88, 166, 255, 0.1);
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }

    .mobile-menu-toggle {
        display: block;
    }

    .container {
        padding: 1rem;
    }

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

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

    .contact-buttons {
        flex-direction: column;
        align-items: center;
    }
}

/* Animations */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Toast notification */
.toast {
    position: fixed;
    top: 20px;
    right: 20px;
    background: linear-gradient(135deg, #10b981, #059669);
    color: white;
    padding: 1rem 1.5rem;
    border-radius: 8px;
    z-index: 10000;
    transform: translateX(100%);
    transition: transform 0.3s ease;
}

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

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

::-webkit-scrollbar-track {
    background: #0d1117;
}

::-webkit-scrollbar-thumb {
    background: #30363d;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #484f58;
}