* {
    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: 1400px;
    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;
}

/* Service Sections */
.service-section {
    margin-bottom: 5rem;
    position: relative;
}

.section-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 3rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid rgba(48, 54, 61, 0.3);
}

.section-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, #58a6ff, #7c3aed);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.3rem;
}

.section-title {
    font-size: 1.8rem;
    font-weight: 600;
    color: #f0f6fc;
    margin: 0;
}

.section-subtitle {
    color: #8b949e;
    font-size: 0.95rem;
    margin-left: auto;
    font-style: italic;
}

/* Service Cards Grid */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
}

.service-card {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    background: rgba(22, 27, 34, 0.6);
    border: 1px solid rgba(48, 54, 61, 0.4);
    border-radius: 16px;
    padding: 2rem;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(8px);
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, #58a6ff, #7c3aed, #f97316);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.service-card:hover {
    background: rgba(22, 27, 34, 0.8);
    border-color: rgba(88, 166, 255, 0.3);
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

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

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1.5rem;
    gap: 0.5rem;
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: #f0f6fc;
    margin-bottom: 0.5rem;
    line-height: 1.3;
}

.card-price {
    font-size: 1.8rem;
    font-weight: 700;
    color: #58a6ff;
    white-space: nowrap;
}

.original-price {
    display: block;
    font-size: 0.9rem;
    color: #8b949e;
    text-decoration: line-through;
    margin-bottom: 0.25rem;
}

.card-badge {
    background: rgba(88, 166, 255, 0.15);
    color: #58a6ff;
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    border: 1px solid rgba(88, 166, 255, 0.3);
    white-space: nowrap;
}

.card-badge.popular {
    background: rgba(124, 58, 237, 0.15);
    color: #a78bfa;
    border-color: rgba(124, 58, 237, 0.3);
}

.card-badge.hot {
    background: rgba(249, 115, 22, 0.15);
    color: #fb923c;
    border-color: rgba(249, 115, 22, 0.3);
}

.card-badge.advanced {
    background: rgba(139, 92, 246, 0.15);
    color: #c4b5fd;
    border-color: rgba(139, 92, 246, 0.3);
}

.card-features {
    list-style: none;
    margin-bottom: 2rem;
    space-y: 0.75rem;
}

.card-features li {
    color: #c9d1d9;
    font-size: 0.95rem;
    margin-bottom: 0.75rem;
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
}

.feature-icon {
    color: #3fb950;
    font-size: 0.9rem;
    margin-top: 0.1rem;
    flex-shrink: 0;
}

.card-button {
    width: 100%;
    padding: 1rem 1.5rem;
    background: rgba(48, 54, 61, 0.5);
    border: 1px solid rgba(48, 54, 61, 0.8);
    color: #c9d1d9;
    border-radius: 12px;
    font-family: 'Poppins', sans-serif;
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.card-button:hover {
    background: rgba(88, 166, 255, 0.1);
    border-color: rgba(88, 166, 255, 0.5);
    color: #58a6ff;
    transform: translateY(-2px);
}

.card-button.primary {
    background: linear-gradient(135deg, #58a6ff, #7c3aed);
    border-color: transparent;
    color: white;
    box-shadow: 0 4px 15px rgba(88, 166, 255, 0.3);
}

.card-button.primary:hover {
    background: linear-gradient(135deg, #4493f8, #6d28d9);
    box-shadow: 0 6px 20px rgba(88, 166, 255, 0.4);
    transform: translateY(-3px);
}

/* Special Package */
.special-package {
    position: relative;
    background: rgba(88, 166, 255, 0.05);
    border-color: rgba(88, 166, 255, 0.3);
}

.special-package::after {
    content: '🔥 PHỔ BIẾN';
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, #ff6b35, #f7931e);
    color: white;
    padding: 0.9rem 1.2rem 0.2rem;
    border-radius: 25px;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.5px;
    box-shadow: 0 4px 15px rgba(255, 107, 53, 0.4);
    border: 2px solid rgba(255, 255, 255, 0.2);
    animation: pulse-glow 2s infinite;
}

@keyframes pulse-glow {
    0%, 100% {
        box-shadow: 0 4px 15px rgba(255, 107, 53, 0.4);
        transform: translateX(-50%) scale(1);
    }
    50% {
        box-shadow: 0 6px 25px rgba(255, 107, 53, 0.6);
        transform: translateX(-50%) scale(1.05);
    }
}

/* Course Section */
.course-section {
    margin-bottom: 5rem;
    position: relative;
}

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

.course-main-title {
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    font-weight: 700;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, #6366f1, #8b5cf6, #ec4899);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 0 30px rgba(99, 102, 241, 0.5);
}

.course-main-subtitle {
    color: #9ca3af;
    font-size: 1rem;
    max-width: 600px;
    margin: 0 auto;
}

/* Main Grid - 2 Columns */
.course-main-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-bottom: 4rem;
}

/* Platform Cards */
.platform-card {
    background: rgba(17, 24, 39, 0.8);
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(99, 102, 241, 0.2);
    transition: all 0.4s ease;
}

.platform-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 25px 60px rgba(0, 0, 0, 0.4);
    border-color: rgba(99, 102, 241, 0.4);
}

/* Platform Headers */
.platform-header {
    padding: 1.5rem;
    background: linear-gradient(135deg, #4338ca, #7c3aed);
    position: relative;
    overflow: hidden;
}

.platform-header.facebook {
    background: linear-gradient(135deg, #1877f2, #4338ca);
}

.platform-header.tiktok {
    background: linear-gradient(135deg, #fe2c55, #7c3aed);
}

.platform-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.1'%3E%3Ccircle cx='30' cy='30' r='2'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.3;
}

.platform-info {
    display: flex;
    align-items: center;
    gap: 1rem;
    position: relative;
    z-index: 1;
}

.platform-icon {
    font-size: 2rem;
    color: white;
}

.platform-title {
    font-size: 1.4rem;
    font-weight: 700;
    color: white;
}

/* Course Grid inside each platform */
.course-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    padding: 1.5rem;
}

/* Course Cards */
.course-card {
    background: rgba(31, 41, 55, 0.6);
    border-radius: 16px;
    padding: 1.5rem;
    border: 1px solid rgba(75, 85, 99, 0.3);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.course-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, #6366f1, #8b5cf6);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.course-card:hover {
    transform: translateY(-3px);
    border-color: rgba(99, 102, 241, 0.5);
    box-shadow: 0 10px 30px rgba(99, 102, 241, 0.2);
}

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

.course-card.highlighted {
    border-color: rgba(139, 92, 246, 0.5);
    background: rgba(139, 92, 246, 0.1);
}

.course-card.highlighted::before {
    background: linear-gradient(90deg, #8b5cf6, #ec4899);
    opacity: 1;
}

/* Course Header */
.course-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
    gap: 0.5rem;
}

.course-name {
    font-size: 1rem;
    font-weight: 600;
    color: #f9fafb;
}

.course-badge {
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.7rem;
    font-weight: 600;
    white-space: nowrap;
}

.course-badge.basic {
    background: rgba(99, 102, 241, 0.2);
    color: #a5b4fc;
    border: 1px solid rgba(99, 102, 241, 0.3);
}

.course-badge.advanced {
    background: rgba(139, 92, 246, 0.2);
    color: #c4b5fd;
    border: 1px solid rgba(139, 92, 246, 0.3);
}

.course-badge.hot {
    background: rgba(236, 72, 153, 0.2);
    color: #f9a8d4;
    border: 1px solid rgba(236, 72, 153, 0.3);
}

.course-badge.bestseller {
    background: rgba(236, 72, 153, 0.2);
    color: #f9a8d4;
    border: 1px solid rgba(236, 72, 153, 0.3);
}

/* Course Price */
.course-price {
    font-size: 1.5rem;
    font-weight: 700;
    color: #6366f1;
    margin-bottom: 0.5rem;
}

.course-duration {
    font-size: 0.8rem;
    color: #9ca3af;
    margin-bottom: 1rem;
}

/* Course Features */
.course-features {
    list-style: none;
    margin-bottom: 1.5rem;
    flex: 1;
}

.course-features li {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
    font-size: 0.8rem;
    color: #d1d5db;
    line-height: 1.4;
}

.course-features i {
    color: #10b981;
    font-size: 0.7rem;
    margin-top: 0.15rem;
    flex-shrink: 0;
}

/* Course Buttons */
.course-btn {
    width: 100%;
    padding: 0.75rem;
    border: none;
    border-radius: 10px;
    font-family: 'Poppins', sans-serif;
    font-weight: 600;
    font-size: 0.8rem;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-top: auto;
}

.basic-btn {
    background: rgba(99, 102, 241, 0.2);
    color: #a5b4fc;
    border: 1px solid rgba(99, 102, 241, 0.3);
}

.basic-btn:hover {
    background: rgba(99, 102, 241, 0.3);
    color: #c7d2fe;
    transform: translateY(-1px);
}

.advanced-btn {
    background: linear-gradient(135deg, #6366f1, #8b5cf6);
    color: white;
    border: none;
}

.advanced-btn:hover {
    background: linear-gradient(135deg, #4f46e5, #7c3aed);
    transform: translateY(-1px);
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.4);
}

.bestseller-btn {
    background: linear-gradient(135deg, #ec4899, #8b5cf6);
    color: white;
    border: none;
}

.bestseller-btn:hover {
    background: linear-gradient(135deg, #db2777, #7c3aed);
    transform: translateY(-1px);
    box-shadow: 0 4px 15px rgba(236, 72, 153, 0.4);
}

/* Services Section */
.services-section {
    margin-top: 4rem;
}

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

.services-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: #a5b4fc;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

/* Service Cards */
.service-card-new {
    background: rgba(17, 24, 39, 0.8);
    border-radius: 16px;
    padding: 1.5rem;
    border: 1px solid rgba(75, 85, 99, 0.3);
    transition: all 0.3s ease;
}

.service-card-new:hover {
    transform: translateY(-3px);
    border-color: rgba(99, 102, 241, 0.5);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.service-card-new.highlighted {
    border-color: rgba(139, 92, 246, 0.5);
    background: rgba(139, 92, 246, 0.1);
}

.service-header-new {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.service-icon-new {
    font-size: 1.5rem;
}

.service-icon-new.facebook { color: #1877f2; }
.service-icon-new.tiktok { color: #fe2c55; }
.service-icon-new.code { color: #6366f1; }

.service-name-new {
    font-size: 1.1rem;
    font-weight: 600;
    color: #f9fafb;
}

/* Service Pricing */
.service-pricing {
    display: flex;
    justify-content: space-between;
    margin-bottom: 1.5rem;
}

.price-tier {
    text-align: center;
}

.price-label {
    font-size: 0.75rem;
    color: #9ca3af;
    margin-bottom: 0.25rem;
}

.price-amount {
    font-size: 1.2rem;
    font-weight: 700;
    color: #6366f1;
}

.single-price {
    font-size: 1.8rem;
    font-weight: 700;
    color: #6366f1;
    text-align: center;
    margin-bottom: 1.5rem;
}

/* Service Features */
.service-features-new {
    list-style: none;
    margin-bottom: 1.5rem;
}

.service-features-new li {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
    font-size: 0.85rem;
    color: #d1d5db;
}

.service-features-new i {
    color: #10b981;
    font-size: 0.8rem;
}

/* Service Buttons */
.service-btn-new {
    width: 100%;
    padding: 0.75rem;
    border: none;
    border-radius: 10px;
    font-family: 'Poppins', sans-serif;
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.facebook-btn {
    background: rgba(24, 119, 242, 0.2);
    color: #60a5fa;
    border: 1px solid rgba(24, 119, 242, 0.3);
}

.facebook-btn:hover {
    background: rgba(24, 119, 242, 0.3);
    transform: translateY(-1px);
}

.tiktok-btn {
    background: rgba(254, 44, 85, 0.2);
    color: #f472b6;
    border: 1px solid rgba(254, 44, 85, 0.3);
}

.tiktok-btn:hover {
    background: rgba(254, 44, 85, 0.3);
    transform: translateY(-1px);
}

.code-btn {
    background: rgba(99, 102, 241, 0.2);
    color: #a5b4fc;
    border: 1px solid rgba(99, 102, 241, 0.3);
}

.code-btn:hover {
    background: rgba(99, 102, 241, 0.3);
    transform: translateY(-1px);
}

/* VIP Package */
.vip-package {
    position: relative;
    background: linear-gradient(135deg, rgba(251, 191, 36, 0.1), rgba(245, 158, 11, 0.1));
    border: 2px solid rgba(251, 191, 36, 0.3);
    border-radius: 20px;
    padding: 2rem;
    margin-top: 2rem;
    overflow: hidden;
}

.vip-package::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #fbbf24, #f59e0b, #d97706);
}

.vip-glow {
    position: absolute;
    inset: -2px;
    background: linear-gradient(135deg, #fbbf24, #f59e0b);
    border-radius: 20px;
    opacity: 0.3;
    blur: 20px;
    z-index: -1;
}

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

.vip-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #fbbf24, #f59e0b);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    color: #0f172a;
}

.vip-info h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: #fbbf24;
    margin-bottom: 0.25rem;
}

.vip-info p {
    color: #9ca3af;
    font-size: 0.9rem;
}

.vip-price {
    text-align: center;
    margin-bottom: 1.5rem;
}

.vip-price .original {
    text-decoration: line-through;
    color: #9ca3af;
    font-size: 1rem;
}

.vip-price .discounted {
    font-size: 2.5rem;
    font-weight: 700;
    color: #fbbf24;
    display: block;
}

.vip-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 0.75rem;
    margin-bottom: 2rem;
}

.vip-feature {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem;
    background: rgba(251, 191, 36, 0.1);
    border-radius: 10px;
    border: 1px solid rgba(251, 191, 36, 0.2);
}

.vip-feature i {
    color: #fbbf24;
    font-size: 1rem;
}

.vip-feature span {
    color: #d1d5db;
    font-size: 0.85rem;
    font-weight: 500;
}

.vip-btn {
    width: 100%;
    padding: 1.25rem;
    background: linear-gradient(135deg, #fbbf24, #f59e0b);
    color: #0f172a;
    border: none;
    border-radius: 14px;
    font-family: 'Poppins', sans-serif;
    font-weight: 700;
    font-size: 1.1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.vip-btn:hover {
    background: linear-gradient(135deg, #f59e0b, #d97706);
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(251, 191, 36, 0.4);
}

/* Call to Action */
.cta-section {
    position: relative;
    text-align: center;
    padding: 4rem 2rem;
    background: linear-gradient(135deg, 
        rgba(88, 166, 255, 0.15), 
        rgba(124, 58, 237, 0.15), 
        rgba(236, 72, 153, 0.1)
    );
    border-radius: 24px;
    margin: 4rem 0;
    border: 1px solid rgba(88, 166, 255, 0.3);
    overflow: hidden;
    backdrop-filter: blur(20px);
}

.cta-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #58a6ff, #7c3aed, #ec4899, #f97316);
    animation: shimmer 3s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

.cta-section::after {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(88, 166, 255, 0.1) 0%, transparent 70%);
    animation: pulse-bg 4s ease-in-out infinite;
    z-index: -1;
}

@keyframes pulse-bg {
    0%, 100% { opacity: 0.5; transform: scale(1); }
    50% { opacity: 0.8; transform: scale(1.1); }
}

.cta-header {
    margin-bottom: 3rem;
    position: relative;
    z-index: 1;
}

.cta-title {
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    font-weight: 700;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, #58a6ff, #7c3aed, #ec4899);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 0 30px rgba(88, 166, 255, 0.3);
    position: relative;
}

.cta-title::after {
    content: '💬';
    position: absolute;
    top: -10px;
    right: -30px;
    font-size: 2rem;
    animation: float 2s ease-in-out infinite;
}

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

.cta-subtitle {
    color: #c9d1d9;
    margin-bottom: 2.5rem;
    font-size: 1.1rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.7;
    opacity: 0.9;
}

.cta-buttons {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    flex-wrap: wrap;
    position: relative;
    z-index: 1;
}

/* Enhanced Button Styles */
.cta-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    padding: 1.2rem 2rem;
    border-radius: 16px;
    font-family: 'Poppins', sans-serif;
    font-weight: 600;
    font-size: 1rem;
    text-decoration: none;
    min-width: 200px;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    border: 2px solid transparent;
    backdrop-filter: blur(10px);
}

.cta-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s ease;
}

.cta-btn:hover::before {
    left: 100%;
}

.cta-btn i {
    font-size: 1.1rem;
    transition: all 0.3s ease;
}

.cta-btn:hover {
    transform: translateY(-3px);
}

.cta-btn:active {
    transform: translateY(-1px);
}

/* Primary Button (Thanh Toán) */
.cta-btn.primary {
    background: linear-gradient(135deg, #58a6ff, #7c3aed);
    color: white;
    box-shadow: 0 8px 25px rgba(88, 166, 255, 0.4);
    border-color: rgba(255, 255, 255, 0.2);
}

.cta-btn.primary:hover {
    background: linear-gradient(135deg, #4493f8, #6d28d9);
    box-shadow: 0 12px 35px rgba(88, 166, 255, 0.6);
    border-color: rgba(255, 255, 255, 0.3);
}

.cta-btn.primary:hover i {
    transform: scale(1.1) rotate(5deg);
}

/* Secondary Button (Tư Vấn) */
.cta-btn.secondary {
    background: rgba(22, 27, 34, 0.8);
    color: #58a6ff;
    border-color: rgba(88, 166, 255, 0.4);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
}

.cta-btn.secondary:hover {
    background: rgba(88, 166, 255, 0.1);
    color: #74b9ff;
    border-color: rgba(88, 166, 255, 0.6);
    box-shadow: 0 12px 35px rgba(88, 166, 255, 0.3);
}

.cta-btn.secondary:hover i {
    transform: scale(1.1);
    color: #74b9ff;
}

/* Tertiary Button (Hotline) */
.cta-btn.tertiary {
    background: rgba(236, 72, 153, 0.15);
    color: #ec4899;
    border-color: rgba(236, 72, 153, 0.4);
    box-shadow: 0 8px 25px rgba(236, 72, 153, 0.2);
}

.cta-btn.tertiary:hover {
    background: rgba(236, 72, 153, 0.25);
    color: #f472b6;
    border-color: rgba(236, 72, 153, 0.6);
    box-shadow: 0 12px 35px rgba(236, 72, 153, 0.4);
}

.cta-btn.tertiary:hover i {
    transform: scale(1.1);
    animation: ring 0.5s ease-in-out;
}

@keyframes ring {
    0%, 100% { transform: scale(1.1) rotate(0deg); }
    25% { transform: scale(1.1) rotate(-5deg); }
    75% { transform: scale(1.1) rotate(5deg); }
}

/* 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: 1024px) {
    .course-main-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .course-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

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

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

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

    .container {
        padding: 1rem;
    }

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

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

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

    .section-header {
        flex-direction: column;
        text-align: center;
        gap: 1rem;
    }

    .section-subtitle {
        margin-left: 0;
    }

    .platform-header {
        padding: 1rem;
    }

    .platform-title {
        font-size: 1.2rem;
    }

    .course-grid,
    .services-grid {
        grid-template-columns: 1fr;
    }

    .service-pricing {
        flex-direction: column;
        gap: 0.5rem;
        text-align: center;
    }

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

    .vip-features {
        grid-template-columns: 1fr;
    }

    .cta-section {
        padding: 3rem 1.5rem;
        margin: 2rem 0;
    }

    .cta-buttons {
        flex-direction: column;
        align-items: center;
        gap: 1rem;
    }

    .cta-btn {
        min-width: 250px;
        padding: 1rem 1.5rem;
    }

    .cta-title::after {
        position: static;
        display: block;
        margin-top: 0.5rem;
    }
}

/* Scroll 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);
}

/* 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;
}

/* 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;
}