/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #fcfcfc;
}

/* Main Header */
.main-header {
    background-color: #fff;
    padding: 0 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 72px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
    position: sticky;
    top: 0;
    z-index: 100;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 1.5rem;
    font-weight: 800;
    color: #1a9c5c;
}

.desktop-nav {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    height: 100%;
}

.nav-item {
    height: 100%;
    display: flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
    font-weight: 600;
    color: #4b5563;
    padding: 0 16px;
    transition: color 0.2s;
    font-size: 0.95rem;
}

.nav-item:hover {
    color: #1a9c5c;
}

.active-dropdown {
    background-color: #e6f7ef;
    color: #1a9c5c;
    border-bottom: 3px solid #1a9c5c;
}

.nav-menu ul {
    display: flex;
    list-style: none;
    gap: 1.5rem;
    align-items: center;
}

.nav-menu a {
    text-decoration: none;
    color: #4b5563;
    font-weight: 600;
    transition: color 0.3s;
    font-size: 0.95rem;
}

.nav-menu a:hover {
    color: #1a9c5c;
}

.dropdown-icon {
    font-size: 0.6rem;
    margin-top: 2px;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.search-box {
    display: flex;
    align-items: center;
    background-color: #f3f4f6;
    border-radius: 50px;
    padding: 10px 18px;
    border: 1px solid #e5e7eb;
}

.search-box input {
    border: none;
    background: transparent;
    outline: none;
    padding-left: 8px;
    font-family: inherit;
    width: 220px;
    font-size: 0.95rem;
}

.lang-toggle {
    display: flex;
    background-color: #e5e7eb;
    border-radius: 20px;
    padding: 3px;
    cursor: pointer;
}

.lang {
    padding: 4px 12px;
    font-size: 0.85rem;
    font-weight: 700;
    border-radius: 18px;
    color: #6b7280;
}

.lang.active {
    background-color: #1a9c5c;
    color: #fff;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.hotline {
    display: flex;
    align-items: center;
    gap: 8px;
    color: #1a9c5c;
    font-weight: 800;
    font-size: 1.1rem;
}

.btn-login {
    background-color: transparent;
    color: #1a9c5c;
    border: 2px solid #1a9c5c;
    padding: 6px 20px;
    font-size: 0.95rem;
    font-weight: 700;
    border-radius: 50px;
    text-decoration: none;
    transition: all 0.3s ease;
    margin-left: 0.5rem;
}

.btn-login:hover {
    background-color: #1a9c5c;
    color: #fff;
    box-shadow: 0 4px 10px rgba(26, 156, 92, 0.2);
}

/* Hero Section */
#hero {
    text-align: center;
    padding: 5rem 2rem;
    background: linear-gradient(135deg, #f0f8ff 0%, #e6f7ff 100%);
    color: #1f2937;
    border-bottom: 1px solid #e5e7eb;
}

#hero h2 {
    font-size: 2.8rem;
    margin-bottom: 1rem;
    font-weight: 800;
    color: #111827;
}

#hero p {
    font-size: 1.2rem;
    color: #4b5563;
    max-width: 600px;
    margin: 0 auto;
}

/* Courses Section */
#courses {
    width: 100%;
}

.section-title {
    text-align: left;
    margin-bottom: 2rem;
    font-size: 1.8rem;
    color: #111;
}

.course-container {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
}

/* Course Card (Vertical Layout for Grid) */
.course-card {
    display: flex;
    flex-direction: column;
    background: #ffffff;
    border-radius: 16px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
    border: 1px solid #f0f4f8;
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.course-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.1);
}

.course-image {
    width: 100%;
    overflow: hidden;
}

.course-image img {
    width: 100%;
    height: 240px;
    object-fit: cover;
    display: block;
    transition: transform 0.5s ease;
}

.course-card:hover .course-image img {
    transform: scale(1.05);
}

.course-content {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    padding: 1.8rem;
}

.badge {
    background-color: #ffeae6;
    color: #ff5722;
    padding: 6px 14px;
    border-radius: 4px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 1rem;
    display: inline-block;
}

.course-title {
    font-size: 1.5rem;
    color: #1f2937;
    margin-bottom: 1rem;
    font-weight: 700;
}

.course-features {
    list-style: none;
    margin-bottom: 1.5rem;
}

.course-features li {
    margin-bottom: 0.6rem;
    color: #555;
    display: flex;
    align-items: flex-start;
    gap: 8px;
    font-size: 0.95rem;
}

.course-features .icon {
    color: #555;
    font-size: 0.9rem;
    margin-top: 2px;
}

.course-price {
    font-size: 1.4rem;
    font-weight: 700;
    color: #111;
    margin-bottom: 1.5rem;
}

.course-actions {
    display: flex;
    width: 100%;
    margin-top: 0.5rem;
}

.btn {
    padding: 14px 32px;
    border-radius: 50px; /* Pill shape */
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: center;
    width: 100%;
    letter-spacing: 0.5px;
}

.btn-primary {
    background-color: #1a9c5c;
    color: white;
    border: none;
    box-shadow: 0 4px 15px rgba(26, 156, 92, 0.3);
}

.btn-primary:hover {
    background-color: #147c49;
    box-shadow: 0 6px 20px rgba(26, 156, 92, 0.4);
    transform: translateY(-2px);
}

.btn-secondary {
    background-color: transparent;
    color: #10b981;
    border: 1px solid #10b981;
}

.btn-secondary:hover {
    background-color: #ecfdf5;
}

/* Responsive Design for smaller screens */
@media (max-width: 768px) {
    .course-container {
        grid-template-columns: 1fr; /* Switch to 1 column on mobile */
    }
    .course-actions {
        width: 100%;
        flex-direction: column;
    }
    .btn {
        width: 100%;
    }
}

/* Success Stories Section */
#success-stories {
    padding: 3rem 0 5rem;
    background-color: #fcfcfc;
    overflow: hidden;
}

.marquee-container {
    width: 100%;
    overflow: hidden;
    position: relative;
    white-space: nowrap;
}

.marquee-content {
    display: inline-flex;
    gap: 2rem;
    /* 20s animation from right to left */
    animation: marquee 20s linear infinite;
    padding: 1rem 0;
}

/* Pause the scrolling when hovering over it */
.marquee-container:hover .marquee-content {
    animation-play-state: paused;
}

@keyframes marquee {
    0% { transform: translateX(0); }
    /* Shift by half because items are duplicated */
    100% { transform: translateX(calc(-50% - 1rem)); } 
}

.student-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    background: #fff;
    border: 1px solid #eaeaea;
    border-radius: 12px;
    padding: 1.5rem;
    min-width: 220px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s;
}

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

.student-img {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    object-fit: cover;
    margin-bottom: 1rem;
    border: 3px solid #1a9c5c;
}

.student-name {
    font-size: 1.1rem;
    color: #1f2937;
    margin-bottom: 0.2rem;
    font-weight: 700;
}

.student-varsity {
    font-size: 0.95rem;
    color: #1a9c5c;
    font-weight: 600;
}

/* Footer */
footer {
    text-align: center;
    padding: 2rem;
    background-color: #2c3e50;
    color: #fff;
    margin-top: 4rem;
}

/* Course Details Page */
.course-details-main {
    max-width: 1200px;
    margin: 3rem auto;
    padding: 0 5%;
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 2.5rem;
}

.video-container {
    background: #000;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    margin-bottom: 2rem;
}

.video-container video {
    display: block;
    width: 100%;
}

.course-info h1 {
    font-size: 2.2rem;
    color: #1f2937;
    margin-bottom: 1rem;
    margin-top: 0.5rem;
}

.course-description {
    font-size: 1.1rem;
    color: #4b5563;
    line-height: 1.8;
    margin-bottom: 2rem;
}

.course-info h3 {
    font-size: 1.3rem;
    color: #111827;
}

.checkout-box {
    background: #fff;
    padding: 2rem;
    border-radius: 16px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.08);
    border: 1px solid #f0f4f8;
    position: sticky;
    top: 100px; /* Sticks to the top while scrolling */
}

.price-title {
    font-size: 1.1rem;
    color: #6b7280;
    font-weight: 600;
}

.price-amount {
    font-size: 2.8rem;
    color: #1a9c5c;
    font-weight: 800;
    margin-bottom: 1.5rem;
}

/* Make course details page responsive */
@media (max-width: 900px) {
    .course-details-main {
        grid-template-columns: 1fr;
    }
    .checkout-box {
        position: static;
    }
}