/* =========================
   GLOBAL STYLES
========================= */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Poppins', sans-serif;
}

body {
    background-color: #0c0c1d;
    color: #fff;
    overflow-x: hidden;
    line-height: 1.6;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
}

/* =========================
   NAVBAR
========================= */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(12, 12, 29, 0.7);
    backdrop-filter: blur(10px);
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0, 224, 255, 0.1);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
}

.logo {
    width: 45px;
    height: 45px;
    border-radius: 50%;
}

.brand-name {
    font-size: 1.5rem;
    color: #fff;
    font-weight: 600;
}

.brand-name span {
    color: #00e0ff;
}

.nav-links {
    display: flex;
    gap: 25px;
    list-style: none;
}

.nav-links a {
    color: #ccc;
    text-decoration: none;
    font-weight: 500;
    transition: 0.3s;
    padding: 6px 10px;
    border-radius: 6px;
}

.nav-links a:hover,
.nav-links a.active {
    color: #00e0ff;
}

/* =========================
   PAGE HEADER
========================= */
.page-header {
    text-align: center;
    padding-top: 120px;
    padding-bottom: 40px;
    background: linear-gradient(180deg, #0c0c1d 0%, #10102b 100%);
    animation: fadeIn 1.5s ease;
}

.page-header h1 {
    font-size: 2.5rem;
    color: #00e0ff;
    margin-bottom: 15px;
}

.page-header p {
    color: #aaa;
    font-size: 1.1rem;
}

/* =========================
   COURSES GRID
========================= */
.courses-grid {
    padding: 40px 0 80px;
}

.courses-grid .container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
}

/* =========================
   COURSE CARD
========================= */
.course-card {
    background: #141432;
    border-radius: 15px;
    box-shadow: 0 0 15px rgba(0, 224, 255, 0.08);
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.course-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 0 25px rgba(0, 224, 255, 0.25);
}

/* Header inside each card */
.course-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 18px 22px;
    cursor: pointer;
    background: rgba(255, 255, 255, 0.05);
    transition: background 0.3s ease;
}

.course-header:hover {
    background: rgba(255, 255, 255, 0.1);
}

.course-header h3 {
    font-size: 1.2rem;
    color: #fff;
}

.toggle-icon {
    font-size: 1.3rem;
    color: #00e0ff;
    transition: transform 0.4s ease;
}

/* Card open animation */
.course-card.open .toggle-icon {
    transform: rotate(90deg);
}

/* Course content */
.course-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s ease;
    padding: 0 22px;
}

.course-card.open .course-content {
    padding-bottom: 20px;
}

/* Inside content */
.course-content img {
    width: 100%;
    border-radius: 10px;
    margin: 15px 0;
}

.course-content p {
    color: #bbb;
    font-size: 0.95rem;
    margin-bottom: 15px;
}

.btn {
    display: inline-block;
    padding: 10px 22px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 600;
    transition: 0.3s ease;
}

.btn.primary {
    background: linear-gradient(90deg, #00e0ff, #0077ff);
    color: #fff;
}

.btn.primary:hover {
    transform: scale(1.05);
    box-shadow: 0 0 10px #00e0ff;
}

/* =========================
   FOOTER
========================= */
footer {
    text-align: center;
    padding: 25px 0;
    background: rgba(12, 12, 29, 0.8);
    color: #777;
    font-size: 0.9rem;
    border-top: 1px solid rgba(0, 224, 255, 0.1);
}

/* =========================
   ANIMATIONS
========================= */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* =========================
   RESPONSIVE
========================= */
@media (max-width: 768px) {
    .nav-links {
        gap: 15px;
    }

    .page-header h1 {
        font-size: 2rem;
    }

    .course-header h3 {
        font-size: 1rem;
    }
}


@media (max-width: 480px) {
    nav ul {
        flex-wrap: wrap;
        justify-content: center;
        gap: 15px;
    }

    .container h1 {
        font-size: 1.6rem;
    }

    .container p {
        font-size: 0.95rem;
    }

    #googleSignInBtn {
        width: 80%;
        max-width: 250px;
    }
}