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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    color: #232323;
    background-color: #FFFFFF;
}

.container {
    max-width: 1440px;
    margin: 0 auto;
    padding: 0 156px;
}

/* Header Styles */
.header {
    background-color: #FEFEFE;
    height: 72px;
    display: flex;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.header-container {
    max-width: 1440px;
    margin: 0 auto;
    padding: 0 36px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-img {
    width: 82px;
    height: 52px;
    object-fit: cover;
}

.logo-text {
    font-family: 'Poppins', sans-serif;
    font-weight: 600;
    font-size: 20px;
    line-height: 1.15;
    color: #232323;
}

.nav {
    display: flex;
    gap: 12px;
    align-items: center;
}

.nav-link {
    font-family: 'Inter', sans-serif;
    font-weight: 500;
    font-size: 14px;
    line-height: 1.5;
    color: #0D141C;
    text-decoration: none;
    padding: 10px 16px;
    border-radius: 6px;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.nav-link:hover {
    background-color: #F9FAFB;
    color: #3D83F6;
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(61, 131, 246, 0.15);
}

.nav-link:active {
    transform: translateY(0);
    box-shadow: 0 1px 4px rgba(61, 131, 246, 0.1);
}

/* Hamburger Menu */
.hamburger {
    display: none;
    flex-direction: column;
    justify-content: space-around;
    width: 30px;
    height: 30px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 1001;
}

.hamburger-line {
    width: 100%;
    height: 3px;
    background-color: #232323;
    transition: all 0.3s ease;
    transform-origin: center;
}

.hamburger.active .hamburger-line:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

.hamburger.active .hamburger-line:nth-child(2) {
    opacity: 0;
}

.hamburger.active .hamburger-line:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}

/* Mobile Navigation */
.mobile-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: #FFFFFF;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    transform: translateY(-100%);
    opacity: 0;
    transition: all 0.3s ease;
}

.mobile-nav.active {
    display: flex;
    flex-direction: column;
    transform: translateY(0);
    opacity: 1;
}

.mobile-nav-link {
    display: block;
    padding: 16px 20px;
    font-family: 'Inter', sans-serif;
    font-weight: 500;
    font-size: 16px;
    color: #0D141C;
    text-decoration: none;
    border-bottom: 1px solid #E7E9ED;
    transition: all 0.3s ease;
    position: relative;
}

.mobile-nav-link:hover {
    background-color: #F9FAFB;
    color: #3D83F6;
    padding-left: 28px;
}

.mobile-nav-link:active {
    background-color: #E8EDF5;
}

.mobile-nav-link:last-child {
    border-bottom: none;
}

/* Hero Banner Styles */
.hero-banner {
    background-image: url('assets/images/web-banner.png');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    height: 540px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    width: 100%;
}

.banner-content {
    text-align: center;
    max-width: 869px;
    padding: 0 20px;
    position: relative;
    z-index: 2;
}

.banner-title {
    font-family: 'Inter', sans-serif;
    font-weight: 700;
    font-size: 64px;
    line-height: 1.1;
    color: #FFFFFF;
    margin-bottom: 24px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.banner-description {
    font-family: 'Inter', sans-serif;
    font-weight: 400;
    font-size: 20px;
    line-height: 1.2;
    color: #D8D7D9;
    margin-bottom: 40px;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

.btn-register {
    background: linear-gradient(90deg, rgba(13, 128, 242, 1) 0%, rgba(49, 185, 186, 1) 100%);
    color: #F7FAFC;
    font-family: 'Inter', sans-serif;
    font-weight: 700;
    font-size: 14px;
    line-height: 1.5;
    padding: 10px 20px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    min-width: 120px;
    height: 40px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
}

.btn-register:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.3);
}

/* Section Styles */
.section-title {
    font-family: 'Inter', sans-serif;
    font-weight: 700;
    font-size: 36px;
    line-height: 0.6388888888888888;
    text-align: center;
    color: #232323;
    margin-bottom: 24px;
}

.section-description {
    font-family: 'Inter', sans-serif;
    font-weight: 400;
    font-size: 16px;
    line-height: 1.5;
    text-align: center;
    color: #797979;
    max-width: 730px;
    margin: 0 auto 48px;
}

/* About Us */
 .about-section {
  padding: 60px 20px;
  background: #FFFFFF;
  font-family: Arial, sans-serif;
}

.about-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1100px;
  margin: 0 auto;
  gap: 40px;
  flex-wrap: wrap; /* responsive */
}

.about-text {
  flex: 1;
  min-width: 300px;
}

.about-text h2 {
  font-size: 28px;
  font-weight: bold;
  margin-bottom: 20px;
  text-align: center;
}

.about-text p {
  font-size: 16px;
  line-height: 1.7;
  color: #333;
  margin-bottom: 16px;
}

.about-image {
  flex: 1;
  min-width: 280px;
  text-align: center;
}

.about-image img {
  width: 100%;
  max-width: 420px;
  border-radius: 10px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

/* Why Join This Course */
.why-join {
    background-color: #F9FAFB;
    padding: 96px 0;
}

.course-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 48px;
    max-width: 1128px;
    margin: 0 auto;
}

.course-card {
    background-color: #FFFFFF;
    border: 2px solid #E7E9ED;
    border-radius: 8px;
    padding: 6px;
    height: 354px;
    display: flex;
    flex-direction: column;
}

.card-image {
    width: 100%;
    height: 237.8px;
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 16px;
}

.card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.card-content {
    padding: 0 22px 22px;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.card-title {
    font-family: 'Inter', sans-serif;
    font-weight: 500;
    font-size: 20px;
    line-height: 1.2;
    color: #232323;
    margin-bottom: 8px;
}

.card-description {
    font-family: 'Inter', sans-serif;
    font-weight: 500;
    font-size: 16px;
    line-height: 1.5;
    color: #797979;
}

/* What You'll Learn */
.what-learn {
    background-color: #FFFFFF;
    padding: 96px 0;
}

.learning-cards {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    max-width: 1128px;
    margin: 0 auto;
}

.learning-card {
    background-color: #FFFFFF;
    border: 2px solid #E7E9ED;
    border-radius: 8px;
    padding: 24px;
    height: 114px;
    display: flex;
    align-items: center;
    gap: 24px;
}

.card-icon {
    flex-shrink: 0;
}

.learning-card .card-title {
    font-family: 'Inter', sans-serif;
    font-weight: 500;
    font-size: 20px;
    line-height: 1.2;
    color: #232323;
}

/* Course Benefits */
.course-benefits {
    background-color: #FFFFFF;
    padding: 96px 0;
}

.benefit-cards {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    max-width: 1128px;
    margin: 0 auto;
}

.benefit-card {
    background-color: #FFFFFF;
    border: 2px solid #E7E9ED;
    border-radius: 8px;
    padding: 24px;
    height: 114px;
    display: flex;
    align-items: center;
    gap: 24px;
}

.benefit-card .card-title {
    font-family: 'Inter', sans-serif;
    font-weight: 500;
    font-size: 20px;
    line-height: 1.2;
    color: #232323;
}

/* Books Section */
.books-section {
    background-color: #F9FAFB;
    padding: 96px 0;
}

.books-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    max-width: 1128px;
    margin: 0 auto;
}

.book-card {
    background-color: #F9FAFB;
    border: 2px solid #E7E9ED;
    border-radius: 8px;
    padding: 6px;
    height: 640px;
    display: flex;
    flex-direction: column;
}

.book-image {
    width: 100%;
    height: 431px;
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 16px;
    background-color: #D9D9D9;
}

.book-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.book-content {
    padding: 0 22px 22px;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.book-title {
    font-family: 'Inter', sans-serif;
    font-weight: 500;
    font-size: 20px;
    line-height: 1.2;
    color: #232323;
    margin-bottom: 8px;
}

.book-description {
    font-family: 'Inter', sans-serif;
    font-weight: 500;
    font-size: 16px;
    line-height: 1.5;
    color: #797979;
    margin-bottom: 16px;
}

.book-pricing {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 16px;
}

.current-price {
    font-family: 'Inter', sans-serif;
    font-weight: 600;
    font-size: 32px;
    line-height: 0.75;
    color: #35BC7F;
}

.original-price {
    font-family: 'Inter', sans-serif;
    font-weight: 500;
    font-size: 24px;
    line-height: 1;
    color: #797979;
    text-decoration: line-through;
}

.btn-buy {
    background-color: #647BFF;
    color: #FFFFFF;
    font-family: 'Inter', sans-serif;
    font-weight: 600;
    font-size: 24px;
    line-height: 1;
    padding: 10px 20px;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.3s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
}

.btn-buy:hover {
    background-color: #5A6BE8;
}

.book-status {
    background-color: #D9D9D9;
    border-radius: 8px;
    padding: 15px;
    text-align: center;
    margin-top: auto;
}

.status-text {
    font-family: 'Inter', sans-serif;
    font-weight: 600;
    font-size: 24px;
    line-height: 1;
    color: #5F5F5F;
}

/* Pricing Section */
.pricing-section {
    background-color: #FFFFFF;
    padding: 88px 0;
}

.pricing-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    max-width: 744px;
    margin: 0 auto;
}

.pricing-card {
    background-color: #FFFFFF;
    border: 2px solid #E7E9ED;
    border-radius: 8px;
    padding: 30px;
    height: 360px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.plan-title {
    font-family: 'Inter', sans-serif;
    font-weight: 700;
    font-size: 20px;
    line-height: 1;
    color: #0D141C;
    margin-bottom: 16px;
}

.price-info {
    display: flex;
    align-items: baseline;
    gap: 8px;
    margin-bottom: 16px;
}

.price-info .original-price {
    font-family: 'Inter', sans-serif;
    font-weight: 500;
    font-size: 24px;
    line-height: 1.875;
    letter-spacing: -0.04em;
    color: #797979;
    text-decoration: line-through;
}

.price-info .current-price {
    font-family: 'Inter', sans-serif;
    font-weight: 900;
    font-size: 40px;
    line-height: 1.125;
    letter-spacing: -0.025em;
    color: #0D141C;
}

.features-list {
    list-style: none;
    margin-bottom: 16px;
}

.feature-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 12px;
    font-family: 'Inter', sans-serif;
    font-weight: 400;
    font-size: 14px;
    line-height: 1.4285714285714286;
    color: #0D141C;
}

.btn-register-plan {
    background-color: #E8EDF5;
    color: #0D141C;
    font-family: 'Inter', sans-serif;
    font-weight: 700;
    font-size: 14px;
    line-height: 1.5;
    padding: 10px 20px;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.3s ease;
    width: 100%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
}

.btn-register-plan:hover {
    background-color: #D1DCE8;
}

/* FAQ Section */
.faq-section {
    background-color: #F9FAFB;
    padding: 96px 0;
}

.faq-cards {
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
    max-width: 1128px;
    margin: 0 auto;
}

.faq-card {
    background-color: #FFFFFF;
    border: 2px solid #E7E9ED;
    border-radius: 8px;
    padding: 30px;
}

.faq-question {
    font-family: 'Inter', sans-serif;
    font-weight: 600;
    font-size: 20px;
    line-height: 1.15;
    color: #000000;
    margin-bottom: 12px;
}

.faq-answer {
    font-family: 'Inter', sans-serif;
    font-weight: 400;
    font-size: 16px;
    line-height: 1.4375;
    color: #4A739C;
}

/* Don't Miss Section */
.dont-miss {
    background-color: #FFFFFF;
    padding: 96px 0;
}

.dont-miss-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    max-width: 909px;
    margin: 0 auto;
}

.cta-title {
    font-family: 'Inter', sans-serif;
    font-weight: 600;
    font-size: 40px;
    line-height: 1.2;
    color: #232323;
    margin-bottom: 24px;
    text-align: center;
}

/* Contact Section */
.contact-section {
    background-color: #1F2937;
    padding: 48px 0;
}

.contact-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1128px;
    margin: 0 auto;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 12px;
    font-family: 'Inter', sans-serif;
    font-weight: 400;
    font-size: 14px;
    line-height: 1.6428571428571428;
    color: #FFFFFF;
    padding: 8px 12px;
    border-radius: 6px;
    transition: all 0.3s ease;
    cursor: pointer;
    text-decoration: none;
}

.contact-item:hover {
    background-color: rgba(255, 255, 255, 0.1);
    transform: translateY(-1px);
}

.contact-item svg {
    flex-shrink: 0;
    transition: transform 0.3s ease;
}

.contact-item:hover svg {
    transform: scale(1.1);
}

/* Responsive Design */
@media (max-width: 1200px) {
    .container {
        padding: 0 80px;
    }
    
    .course-cards,
    .learning-cards,
    .benefit-cards,
    .books-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 1024px) {
    .container {
        padding: 0 40px;
    }
    
    .nav {
        display: none;
    }
    
    .hamburger {
        display: flex;
    }
    
    .mobile-nav {
        display: flex;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 20px;
    }
    
    .header-container {
        padding: 0 20px;
    }
    
    .nav {
        display: none;
    }
    
    .hamburger {
        display: flex;
    }
    
    .mobile-nav {
        display: flex;
    }
    
    .banner-title {
        font-size: 48px;
    }
    
    .banner-description {
        font-size: 18px;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .course-cards,
    .learning-cards,
    .benefit-cards,
    .books-grid,
    .pricing-cards {
        grid-template-columns: 1fr;
    }
    
    .contact-info {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }
    
    .cta-title {
        font-size: 36px;
    }
    
    .dont-miss-content {
        max-width: 100%;
        padding: 0 20px;
    }
}

@media (max-width: 480px) {
    .banner-title {
        font-size: 36px;
    }
    
    .banner-description {
        font-size: 16px;
    }
    
    .section-title {
        font-size: 24px;
    }
    
    .cta-title {
        font-size: 28px;
    }
    
    .dont-miss-content {
        padding: 0 10px;
    }
}