/* =========================
   Global Styles
========================= */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* Sticky Footer Fix */
html, body {
    height: 100%;
}

body {
    font-family: 'Poppins', sans-serif;
    color: #1f2933;
    background-color: #f9fafb;
    line-height: 1.6;
    display: flex;
    flex-direction: column;
}

main {
    flex: 1;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

/* Container for alignment (safe addition) */
.container {
    max-width: 1200px;
    margin: auto;
}

/* =========================
   Buttons
========================= */
.button {
    display: inline-block;
    padding: 12px 28px;
    border-radius: 30px;
    font-weight: 600;
    transition: all 0.3s ease;
}

.button.primary {
    background: linear-gradient(135deg, #2563eb, #1d4ed8);
    color: #fff;
}

.button.primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(37, 99, 235, 0.35);
}

.button.large {
    margin-top: 25px;
    font-size: 1rem;
}

/* =========================
   Header & Navigation
========================= */
.site-header {
    background: #ffffff;
    padding: 18px 60px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.main-nav ul {
    display: flex;
    gap: 22px;
}

.main-nav ul li a {
    font-weight: 500;
    color: #374151;
    position: relative;
}

.main-nav ul li a:hover {
    color: #2563eb;
}

/* Active Nav Fix */
.main-nav ul li a.active {
    color: #2563eb;
    font-weight: 600;
}

.main-nav ul li a.active::after {
    content: "";
    position: absolute;
    bottom: -6px;
    left: 0;
    width: 100%;
    height: 2px;
    background: #2563eb;
}

/* =========================
   Hero Section
========================= */
.hero-section {
    min-height: 90vh;
    background: linear-gradient(135deg, #0f172a, #1e293b);
    color: #ffffff;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 0 80px;
}

.hero-section h1 {
    font-size: 3rem;
    font-weight: 700;
    max-width: 800px;
}

.hero-section p {
    margin-top: 20px;
    font-size: 1.1rem;
    max-width: 650px;
    opacity: 0.9;
}

/* =========================
   Expertise Section
========================= */
.expertise {
    padding: 80px 60px;
    text-align: center;
    background-color: #ffffff;
}

.expertise h2 {
    font-size: 2.2rem;
    margin-bottom: 15px;
}

.expertise p {
    max-width: 700px;
    margin: auto;
    color: #4b5563;
}

/* =========================
   Features Grid
========================= */
.features-grid {
    padding: 70px 60px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    background-color: #f1f5f9;
}

.feature {
    background: #ffffff;
    padding: 40px;
    text-align: center;
    border-radius: 16px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.05);
    transition: all 0.3s ease;
}

.feature:hover {
    transform: translateY(-6px);
}

.feature h3 {
    font-size: 1.3rem;
    color: #1e3a8a;
}

/* =========================
   Tutorials / Cards
========================= */
.content-list {
    padding: 80px 60px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 35px;
    background-color: #ffffff;
}

.card {
    background: #f9fafb;
    padding: 30px;
    border-radius: 16px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.06);
    transition: all 0.3s ease;
    margin-bottom: 20px;
}

.card:hover {
    transform: translateY(-6px);
}

.card span {
    font-size: 0.85rem;
    color: #2563eb;
    font-weight: 600;
}

.card h4 {
    margin: 15px 0;
    font-size: 1.15rem;
}

.card a {
    font-weight: 600;
    color: #1d4ed8;
}

/* =========================
   Call To Action
========================= */
.cta-subscribe {
    padding: 80px 60px;
    background: linear-gradient(135deg, #2563eb, #1e40af);
    text-align: center;
    color: #ffffff;
}

.cta-subscribe h2 {
    font-size: 2.2rem;
}

.cta-subscribe p {
    margin: 12px 0 25px;
}

.cta-subscribe form {
    display: flex;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
}

.cta-subscribe input {
    padding: 12px 18px;
    border-radius: 30px;
    border: none;
    min-width: 260px;
    outline: none;
}

.cta-subscribe button {
    padding: 12px 30px;
    border-radius: 30px;
    border: none;
    background: #ffffff;
    color: #1e40af;
    font-weight: 700;
    cursor: pointer;
}

/* =========================
   Footer
========================= */
.site-footer {
    background: #020617;
    color: #cbd5f5;
    padding: 60px;
    margin-top: auto;
}

.footer-info h4 {
    color: #ffffff;
}

.footer-nav {
    margin: 20px 0;
}

.footer-nav a {
    margin-right: 20px;
    font-size: 0.9rem;
}

.social-links a img {
    width: 22px;
    margin-right: 14px;
    filter: invert(1);
}

.site-footer p {
    margin-top: 25px;
    font-size: 0.85rem;
    opacity: 0.7;
}

/* =========================
   Responsive
========================= */
@media (max-width: 768px) {
    .hero-section {
        padding: 60px 30px;
    }

    .hero-section h1 {
        font-size: 2.2rem;
    }

    .site-header {
        padding: 18px 30px;
    }
}