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

body {
    font-family: 'Arial', sans-serif;
    line-height: 1.6;
    color: #000;
    background: #fff;
}

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

header {
    background: #000;
    color: #fff;
    padding: 1rem 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.3);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.8rem;
    font-weight: bold;
    color: #ff0000;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-links a {
    color: #fff;
    text-decoration: none;
    transition: opacity 0.3s;
}

.nav-links a:hover {
    opacity: 0.7;
}

/* HERO SECTION */
.hero {
    background: 
        url('picture.png') center/cover no-repeat,
        radial-gradient(circle at 20% 30%, rgba(255,0,0,0.2) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(0,170,255,0.2) 0%, transparent 50%),
        radial-gradient(circle at 40% 80%, rgba(255,0,0,0.1) 0%, transparent 40%),
        linear-gradient(135deg, #000 0%, #001122 100%);
    background-size: cover;
    height: 100vh;
    position: relative;
    display: flex;
    align-items: center;
    text-align: center;
    color: #fff;
    margin-top: 70px;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.4);
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.8);
}

.hero h2 {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: #fff !important;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.8);
}

.hero p {
    font-size: 1.3rem;
    margin-bottom: 2rem;
    text-shadow: 1px 1px 2px rgba(0,0,0,0.8);
}

.cta-button {
    display: inline-block;
    background: #28638d;
    color: #fff;
    padding: 1rem 2rem;
    text-decoration: none;
    border-radius: 50px;
    font-weight: bold;
    transition: transform 0.3s, box-shadow 0.3s;
    border: 2px solid #28638d;
}

.cta-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(255,0,0,0.4);
    background: #cc0000;
}

section {
    padding: 80px 0;
}

h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: #000;
}

/* ABOUT SECTION */
.about {
    background: #fff;
    color: #000;
    text-align: center;
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
}

/* TESTIMONIALS SECTION */
.testimonials {
    background: #000;
    color: #fff;
}

.testimonials h2 {
    color: #fff;
}

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

.testimonial {
    background: #111;
    padding: 2rem;
    border-radius: 10px;
    border: 1px solid #00aaff;
    text-align: center;
}

.student-photo {
    width: 170px;
    height: 170px;
    border-radius: 50%;
    margin: 0 auto 1.5rem;
    background-size: cover;
    background-position: center;
    border: 4px solid #007bff;
    box-shadow: 0 8px 25px rgba(0,123,255,0.3);
}

.testimonial-content p {
    font-size: 1.1rem;
    font-style: italic;
    margin-bottom: 1rem;
    color: #ffffff;
}

.testimonial-content h4 {
    color: #007bff;
    font-weight: 600;
    margin: 0 0 0.5rem 0;
}

/* COURSES SECTIONS */
.courses-introductory, .courses-other {
    background: #ffffff;
    color: #333;
}

.courses-competition {
    background: #000000;
    color: #ffffff;
}

.courses-competition h2,
.courses-competition .course-info h3 {
    color: #ffffff;
}

.courses-competition .course-info p {
    color: #ccc;
}

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

.course-card {
    border: 2px solid #00aaff;
    border-radius: 10px;
    overflow: hidden;
    transition: all 0.3s;
    background: rgba(255,255,255,0.1);
    backdrop-filter: blur(10px);
}

.courses-competition .course-card {
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.2);
}

.course-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 30px rgba(0,170,255,0.4);
    border-color: #ff0000;
}

.course-image {
    width: 100%;
    height: 200px;
}

.course-go-core { background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); }
.course-intro { background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%); }
.course-iq { background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%); }
.course-avishkaar { background: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%); }
.course-v5 { background: linear-gradient(135deg, #fa709a 0%, #fee140 100%); }
.course-vrc { background: linear-gradient(135deg, #ff6b6b 0%, #ffa500 100%); }
.course-coding { background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); }
.course-ai { background: linear-gradient(135deg, #a8edea 0%, #fed6e3 100%); }
.course-projects { background: linear-gradient(135deg, #ff9a9e 0%, #fecfef 100%); }

.course-info {
    padding: 1.5rem;
}

.course-info h3 {
    color: #000;
    margin-bottom: 0.5rem;
}

/* FEATURES SECTION */
.features {
    background: #000;
    color: #fff;
}

.features h2 {
    color: #fff;
}

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

.feature-card {
    background: #111;
    padding: 2rem;
    border-radius: 10px;
    border: 1px solid #00aaff;
    text-align: center;
    transition: all 0.3s;
}

.feature-card:hover {
    box-shadow: 0 10px 20px rgba(0,170,255,0.4);
    border-color: #ff0000;
}

.feature-card h3 {
    color: #ff0000;
    margin-bottom: 1rem;
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

/* CONTACT FORM */
.contact {
    background: #fff;
    color: #000;
}

.contact-form {
    max-width: 600px;
    margin: 0 auto;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: #333;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid #e1e5e9;
    border-radius: 8px;
    font-size: 16px;
    transition: all 0.3s ease;
    box-sizing: border-box;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: #28a745;
    box-shadow: 0 0 0 3px rgba(40, 167, 69, 0.1);
}

#submitBtn {
    background: #28a745;
    color: white;
    padding: 14px 28px;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    width: 100%;
    box-sizing: border-box;
}

#submitBtn:hover {
    background: #218838;
}

.success-message {
    padding: 1.5rem;
    border-radius: 12px;
    margin-top: 1rem;
    background: linear-gradient(135deg, #d4edda 0%, #c3e6cb 100%);
    border: 2px solid #c3e6cb;
    text-align: center;
}

/* FOOTER */
footer {
    background: #000;
    color: #fff;
    text-align: center;
    padding: 2rem 0;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.social-links {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
    justify-content: center;
}

.social-link {
    color: #00aaff;
    text-decoration: none;
    padding: 0.5rem 1rem;
    border: 2px solid #00aaff;
    border-radius: 25px;
    font-weight: 600;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.social-link:hover {
    background: #00aaff;
    color: #000;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0,170,255,0.4);
}

.social-link.instagram:hover {
    background: linear-gradient(45deg, #f09433 0%,#e6683c 25%,#dc2743 50%,#cc2366 75%,#bc1888 100%);
    color: white;
    border-color: transparent;
}

/* RESPONSIVE */
@media (max-width: 768px) {
    .social-links {
        flex-direction: column;
        width: 100%;
        max-width: 300px;
    }
    
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .hero h2 {
        font-size: 1.5rem;
    }
}









/* COURSE SECTION SUBTITLES – ALL 1.8rem, centered */

/* Intro Courses */
.courses-introductory .intro-subtitle {
    text-align: center;
    font-size: 1.8rem;
    font-weight: 400;
    max-width: 1000px;
    margin: 0 auto 4rem auto;
    line-height: 1.4;
}

/* Competition Courses */
.courses-competition .course-subtitle {
    text-align: center;
    font-size: 1.8rem;
    font-weight: 400;
    max-width: 1000px;
    margin: 0 auto 4rem auto;
    line-height: 1.4;
}

/* Other Courses */
.courses-other .course-subtitle {
    text-align: center;
    font-size: 1.8rem;
    font-weight: 400;
    max-width: 1000px;
    margin: 0 auto 4rem auto;
    line-height: 1.4;
}

/* enforce 719×1280 aspect ratio card */
.course-card.intro-only {
    width: 100%;
    height: 0;
    padding-bottom: calc(1280 / 719 * 100%);  /* ≈ 178% */
    position: relative;
    overflow: hidden;
    border: 2px solid #00aaff;
    border-radius: 10px;
    transition: all 0.3s;
    background: rgba(255,255,255,0.1);
    backdrop-filter: blur(10px);
}

.intro-image {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: inherit;
    background-size: contain;
    background-position: center;
    background-repeat: no-repeat;
}




.features-subtitle {
    text-align: center;
    font-size: 1.8rem;
    font-weight: 400;
    max-width: 1000px;
    margin: 0 auto 4rem auto;
    line-height: 1.4;
    color: #fff;
}