/* =========================================
   1. GLOBAL VARIABLES & RESET
   ========================================= */
:root {
    --primary: #4338ca;       /* Indigo 700 */
    --primary-hover: #3730a3; /* Indigo 800 */
    --secondary: #4c51bf;     /* Indigo 600 */
    --dark-bg: #0f172a;       /* Slate 900 */
    --dark-card: #1e293b;     /* Slate 800 */
    --text-main: #1a202c;     /* Gray 900 */
    --text-light: #718096;    /* Gray 500 */
    --white: #ffffff;
    --font-family: 'Inter', sans-serif;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    text-decoration: none !important; /* Removes all underlines */
}

body {
    font-family: var(--font-family);
    color: var(--text-main);
    line-height: 1.6;
    background-color: #f8faff;
    overflow-x: hidden;
}

ul { list-style: none; }
img { max-width: 100%; display: block; }

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

/* =========================================
   2. HEADER & NAVIGATION
   ========================================= */
header {
    background: #fff;
    border-bottom: 1px solid #f1f5f9;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo span {
    font-weight: 800;
    font-size: 1.4rem;
    color: #1a202c;
    letter-spacing: -0.5px;
}

.nav-links {
    display: flex;
    gap: 30px;
    align-items: center;
}

.nav-item {
    font-weight: 500;
    color: #4a5568;
    position: relative;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s ease;
}

.nav-item i { display: none; }
.nav-item:hover { color: var(--primary); }

/* --- ACTIVE COURSES GLOW EFFECT --- */
.active-glow {
    color: #4338ca !important;
    font-weight: 700 !important;
    text-shadow: 0 0 8px rgba(67, 56, 202, 0.4), 0 0 15px rgba(67, 56, 202, 0.2);
    position: relative;
}

.active-glow::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 100%;
    height: 2px;
    background: #4338ca;
    box-shadow: 0 0 10px rgba(67, 56, 202, 0.6);
    border-radius: 2px;
}

/* --- DROPDOWN MENU --- */
.dropdown { position: relative; display: inline-block; }
.dropdown > span { display: flex; align-items: center; cursor: pointer; user-select: none; padding: 5px 0; }

.dropdown-content {
    display: none;
    position: absolute;
    background-color: #ffffff;
    min-width: 260px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
    border-radius: 12px;
    border: 1px solid #e2e8f0;
    z-index: 1001;
    top: 140%;
    right: 0;
    padding: 8px 0;
}

.dropdown.active .dropdown-content { display: block; }

.dropdown-content a {
    color: #4a5568;
    padding: 12px 20px;
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.95rem;
}

.dropdown-content a:hover { background-color: #f8fafc; color: var(--primary); }

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: #1a202c;
    cursor: pointer;
}

/* =========================================
   3. HERO SECTION (NEW GAP & TEXT)
   ========================================= */
.courses-hero {
    padding: 60px 0 40px; /* Creates substantial gap from header */
    text-align: center;
    background: linear-gradient(180deg, #ffffff 0%, #f8faff 100%);
}

.courses-hero h1 {
    font-size: 2.5rem;
    font-weight: 800;
    color: #1e293b;
    margin-bottom: 15px;
    letter-spacing: -1px;
}

.courses-hero p {
    font-size: 1.1rem;
    color: #64748b;
    max-width: 600px;
    margin: 0 auto;
}

/* =========================================
   4. COURSE GRID & CARDS
   ========================================= */
.course-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr); /* 3 columns on desktop */
    gap: 40px; /* Clean separation */
    padding-bottom: 80px;
}

.course-card {
    background: #ffffff;
    border: 1px solid #e2e8f0;
    border-radius: 20px;
    overflow: hidden;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
}

.course-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

.card-image-wrapper {
    position: relative;
    height: 200px;
    overflow: hidden;
}

.card-image-wrapper img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.course-card:hover .card-image-wrapper img {
    transform: scale(1.1);
}

.badge-premium {
    position: absolute;
    top: 15px;
    right: 15px;
    background: linear-gradient(135deg, #4338ca 0%, #6366f1 100%);
    color: white;
    padding: 6px 14px;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.5px;
    box-shadow: 0 4px 10px rgba(67, 56, 202, 0.3);
}

.card-body {
    padding: 24px;
}

.category-tag {
    font-size: 0.75rem;
    font-weight: 700;
    padding: 4px 12px;
    border-radius: 6px;
    text-transform: uppercase;
}

.tag-dev { background: #eef2ff; color: #4338ca; }
.tag-data { background: #ecfdf5; color: #059669; }

.course-title {
    font-size: 1.3rem;
    color: #1e293b;
    margin: 12px 0 4px;
    font-weight: 800;
}

.instructor {
    font-size: 0.85rem;
    color: #64748b;
    margin-bottom: 15px;
}

.course-stats {
    display: flex;
    gap: 15px;
    padding: 12px 0;
    border-top: 1px solid #f1f5f9;
    border-bottom: 1px solid #f1f5f9;
    margin-bottom: 15px;
}

.course-stats span {
    font-size: 0.85rem;
    color: #475569;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 6px;
}

.course-stats i { color: #4338ca; }

/* --- UPDATED PRICE STYLING --- */
.price-container {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
}

.original-price {
    text-decoration: line-through !important;
    color: #94a3b8;
    font-size: 1.1rem;
}

.current-price {
    color: #059669;
    font-weight: 800;
    font-size: 1.4rem;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.view-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background: #1e293b;
    color: white !important;
    padding: 12px;
    border-radius: 10px;
    font-weight: 600;
    transition: background 0.3s;
}

.view-btn:hover {
    background: #4338ca;
}

/* =========================================
   5. RESPONSIVE ADJUSTMENTS
   ========================================= */
@media (max-width: 1024px) {
    .course-grid { 
        grid-template-columns: repeat(2, 1fr); 
        gap: 30px;
    }
    .courses-hero h1 { font-size: 2.2rem; }
}

@media (max-width: 768px) {
    .courses-hero { padding: 40px 0 30px; }
    .courses-hero h1 { font-size: 1.8rem; }
    .courses-hero p { font-size: 1rem; }
    
    .mobile-menu-btn { display: block; z-index: 1002; }

    .nav-links {
        position: absolute; top: 80px; left: 0; width: 100%;
        background: #ffffff; flex-direction: column; align-items: flex-start;
        padding: 0; gap: 0; max-height: 0; overflow: hidden; opacity: 0;
        transition: all 0.3s ease; border-top: 1px solid #f1f5f9;
        box-shadow: 0 15px 40px rgba(0,0,0,0.1);
    }

    .nav-links.active { max-height: 85vh; opacity: 1; }

    .nav-item {
        width: 100%; padding: 16px 24px; font-size: 1.05rem;
        border-bottom: 1px solid #f1f5f9;
    }

    .nav-item i { display: inline-block; width: 24px; color: var(--primary); margin-right: 12px; }

    .dropdown { width: 100%; }
    .dropdown > span { width: 100%; padding: 16px 24px; justify-content: space-between; border-bottom: 1px solid #f1f5f9; }
    .dropdown-content { position: static; display: none; box-shadow: none; background-color: #f8fafc; }
    .dropdown.active .dropdown-content { display: block; }
}

@media (max-width: 650px) {
    .course-grid { 
        grid-template-columns: 1fr; 
        gap: 25px;
    }
}

/* =========================================
   6. FOOTER STYLES
   ========================================= */
footer {
    background-color: #0f172a;
    color: #cbd5e0;
    padding: 80px 0 20px;
    font-size: 0.95rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr 1fr 1fr; 
    gap: 30px;
    margin-bottom: 60px;
}

.footer-brand { padding-right: 20px; }

.footer-logo {
    font-size: 1.8rem;
    font-weight: 800;
    color: #ffffff;
    margin-bottom: 15px;
    letter-spacing: -0.5px;
}

.footer-description {
    color: #94a3b8;
    line-height: 1.6;
    margin-bottom: 25px;
    max-width: 280px;
}

.social-links { display: flex; gap: 12px; }

.social-link {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.05);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #ffffff;
    transition: all 0.3s ease;
}

.social-link:hover {
    background: #4338ca;
    transform: translateY(-3px);
}

.footer-links-title {
    color: #ffffff;
    font-weight: 700;
    margin-bottom: 20px;
    font-size: 0.95rem;
    letter-spacing: 1px;
}

.footer-links li { margin-bottom: 12px; }

.footer-links a {
    color: #94a3b8;
    transition: all 0.2s;
}

.footer-links a:hover {
    color: #4c51bf;
    padding-left: 4px;
}

.footer-bottom {
    border-top: 1px solid #1e293b;
    padding-top: 30px;
    text-align: center;
    color: #64748b;
    font-size: 0.85rem;
}

@media (max-width: 1024px) {
    .footer-grid {
        grid-template-columns: 1fr 1fr 1fr;
        gap: 40px;
    }
    .footer-brand {
        grid-column: span 3;
        text-align: center;
        margin-bottom: 20px;
    }
    .footer-brand .footer-description { margin: 0 auto 20px; }
    .footer-brand .social-links { justify-content: center; }
}

@media (max-width: 600px) {
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .footer-brand { grid-column: span 2; }
}