:root {
    --main: #1f2c9c;
    --main-light: #2f80ed;
    --bg: #f4f7fe;
    --white: #ffffff;
    --text-dark: #1e293b;
    --text-muted: #64748b;
    --success: #22c55e;
}

body {
    font-family: 'Cairo', sans-serif;
    background: var(--bg);
    padding-top: 80px;
    color: var(--text-dark);
}

.page-header {
    background: linear-gradient(135deg, var(--main) 0%, var(--main-light) 100%);
    color: white;
    padding: 80px 0;
    border-radius: 0 0 40px 40px;
    margin-bottom: 50px;
    box-shadow: 0 10px 30px rgba(31, 44, 156, 0.15);
    position: relative;
    overflow: hidden;
}

.page-header::after {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 300px;
    height: 300px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 50%;
}

.course-card {
    border-radius: 24px;
    overflow: hidden;
    background: var(--white);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.03);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid #edf2f7;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.course-card:hover {
    transform: translateY(-12px);
    box-shadow: 0 20px 40px rgba(31, 44, 156, 0.1);
    border-color: var(--main-light);
}

.course-image-container {
    height: 180px;
    background: #f8fafc;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--main);
    position: relative;
}

.free-badge {
    position: absolute;
    top: 15px;
    right: 15px;
    background: var(--success);
    color: white;
    padding: 4px 15px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 700;
    box-shadow: 0 4px 10px rgba(34, 197, 94, 0.3);
}

.course-body {
    padding: 24px;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.course-title {
    font-weight: 800;
    font-size: 1.15rem;
    margin-bottom: 12px;
    color: var(--text-dark);
    line-height: 1.4;
}

.course-desc {
    font-size: 0.9rem;
    color: var(--text-muted);
    line-height: 1.6;
    margin-bottom: 20px;
}

.instructor-info {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-top: auto;
    padding-top: 15px;
    border-top: 1px solid #f1f5f9;
}

.instructor-avatar {
    width: 32px;
    height: 32px;
    background: var(--bg);
    color: var(--main);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    overflow: hidden;
    flex-shrink: 0;
}

.instructor-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.btn-start {
    background: var(--main);
    color: white;
    border-radius: 14px;
    font-weight: 700;
    padding: 12px;
    text-align: center;
    text-decoration: none;
    margin-top: 20px;
    transition: all 0.3s ease;
}

.btn-start:hover {
    background: var(--main-light);
    color: white;
    transform: scale(1.02);
}

/* Search Bar */
.search-container {
    max-width: 600px;
    margin: -30px auto 40px;
    position: relative;
    z-index: 10;
}

.search-input {
    height: 60px;
    border-radius: 30px;
    padding-right: 25px;
    padding-left: 60px;
    border: none;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.08);
    font-weight: 600;
}

.search-btn {
    position: absolute;
    left: 10px;
    top: 50%;
    transform: translateY(-50%);
    width: 45px;
    height: 45px;
    border-radius: 50%;
    background: var(--main);
    color: white;
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
}

@media (max-width: 992px) {
    .course-image-container {
        height: 150px;
    }
    .course-body {
        padding: 18px;
    }
}

@media (max-width: 768px) {
    .page-header {
        padding: 50px 0;
        border-radius: 0 0 30px 30px;
    }
    .page-header h1 {
        font-size: 1.5rem;
    }
    .page-header p {
        font-size: 0.95rem;
    }
    .course-image-container {
        height: 140px;
    }
    .course-body {
        padding: 16px;
    }
    .course-title {
        font-size: 1rem;
    }
    .search-container {
        margin: -20px 15px 30px;
    }
    .search-input {
        height: 50px;
        padding-right: 20px;
        padding-left: 50px;
        font-size: 0.9rem;
    }
    .search-btn {
        width: 38px;
        height: 38px;
        left: 8px;
    }
}

@media (max-width: 576px) {
    .page-header {
        padding: 40px 0;
        border-radius: 0 0 20px 20px;
    }
    .page-header h1 {
        font-size: 1.3rem;
    }
    .course-image-container {
        height: 120px;
    }
    .course-body {
        padding: 14px;
    }
    .course-title {
        font-size: 0.95rem;
    }
    .instructor-info {
        flex-wrap: wrap;
        gap: 6px;
    }
    .btn-start {
        padding: 10px;
        font-size: 0.9rem;
    }
}