/* استيراد الخط */
@import url('https://fonts.googleapis.com/css2?family=Cairo:wght@400;700&display=swap');

/* إعدادات عامة */
body {
    font-family: 'Cairo', sans-serif;
    background: #f5f7fa;
    color: #333;
    margin: 0;
    padding: 0;
    overflow-x: hidden;
    scroll-behavior: smooth;
    direction: rtl;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* تصميم الهيدر */
header {
    background: linear-gradient(135deg, #1a2a44, #00b7eb);
    padding: 20px 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    position: relative;
    z-index: 10;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: #fff;
    margin: 0;
}

.btn-back {
    background: rgba(255, 255, 255, 0.2);
    color: #fff;
    padding: 10px 20px;
    border-radius: 25px;
    font-size: 1.2rem;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.3s ease;
}

.btn-back:hover {
    background: #fff;
    color: #4682b4;
    transform: translateY(-2px);
}

/* تصميم المحتوى الرئيسي */
main.content {
    padding: 60px 20px;
    max-width: 1300px;
    margin: 0 auto;
    text-align: center;
    flex-grow: 1;
}

main.content h2 {
    font-size: 2.5rem;
    color: #1a2a44;
    margin-bottom: 40px;
    font-weight: 700;
}

/* تصميم قائمة الكتب */
.subject {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 25px;
    list-style: none;
    padding: 0;
}

.subject li {
    background: linear-gradient(135deg, #4682b4 0%, #87cefa 100%);
    border-radius: 15px;
    min-height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    font-size: 2rem;
    font-weight: 700;
    color: #fff;
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
    transition: transform 0.4s ease, box-shadow 0.4s ease;
}

.subject li:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

.subject li a {
    color: #fff;
    text-decoration: none;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

/* تصميم الفوتر */
footer {
    background: linear-gradient(135deg, #1a2a44, #00b7eb);
    padding: 20px;
    text-align: center;
    color: #fff;
    font-size: 0.9rem;
    font-weight: 500;
    box-shadow: 0 -5px 15px rgba(0, 212, 255, 0.3);
    position: relative;
    margin-top: auto;
}