:root {
    /* رنگ‌های اختصاصی برای هر رشته */
    --computer-science-color: #3498db;
    --electrical-engineering-color: #e74c3c;
    --mechanical-engineering-color: #f39c12;
    --civil-engineering-color: #2ecc71;
    --default-color: #2c3e50;
    
    --light-color: #ecf0f1;
    --gray-color: #95a5a6;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family:'Iranian Sans','B Nazanin', 'Vazir', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: #ffffff;
    color: #333;
    line-height: 1.6;
}

/* منوی ناوبری */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    background-color: var(--default-color);
    color: lime;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.logo {
    display: flex;
    align-items: center;
    font-size: 1.5rem;
    font-weight: bold;
}

.logo i {
    margin-left: 0.5rem;
    color: var(--light-color);
}

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

.nav-links li a {
    color: yellow;
    text-decoration: none;
    padding: 0.5rem 1rem;
    margin: 0 0.5rem;
    border-radius: 4px;
    transition: all 0.3s ease;
}

.nav-links li a:hover, .nav-links li a.active {
    background-color: rgba(255, 255, 255, 0.2);
}

/* هدر اصلی */
.hero {
background-image: url('header.jpg');   
 
    color: white;
    text-align: center;
    padding: 4.7rem 2rem;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 2rem;
opacity: 0.8;
}

.hero p {
    font-size: 1.2rem;
    opacity: 0.9;
}

/* بخش جستجو */
.search-section {
    margin: 2rem auto;
    max-width: 400px;
}

.search-box {
    display: flex;
    background: white;
    border-radius: 50px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.4);
}

.search-box input {
    flex: 1;
    padding: 1rem 1.5rem;
    border: none;
    outline: none;
    font-size: 1rem;
}

.search-btn {
    background-color: var(--default-color);
    color: white;
    border: none;
    padding: 0 1.5rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.search-btn:hover {
    background-color: #34495e;
}

/* فیلترها */
.filters {
    display: flex;
    justify-content: center;
    margin: 2rem 0;
}

.filter-group {
    display: flex;
    align-items: center;
    background-color: white;
    padding: 0.5rem 1rem;
    border-radius: 50px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.99);
}

.filter-group label {
    margin-left: 0.5rem;
    font-weight: 400;
}

.styled-select {
    padding: 0.5rem 1rem;
    border: 1px solid #ddd;
    border-radius: 8px;
    background-color: #eeeee;
    cursor: pointer;
    transition: all 0.3s ease;
}

/* کارت جزوات */
.notes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.note-card {
    background-color: white;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.99);
    transition: all 0.3s ease;
    position: relative;
    border-top: 4px solid var(--default-color);
}

.note-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 1.5);
}

/* رنگ‌بندی اختصاصی برای هر رشته */
.note-card[data-major="computer-science"] {
    border-top-color: var(--computer-science-color);
}

.note-card[data-major="electrical-engineering"] {
    border-top-color: var(--electrical-engineering-color);
}

.note-card[data-major="mechanical-engineering"] {
    border-top-color: var(--mechanical-engineering-color);
}

.note-card[data-major="civil-engineering"] {
    border-top-color: var(--civil-engineering-color);
}

.note-body {
    padding: 1.5rem;
}

.note-title {
    font-size: 1.2rem;
    margin-bottom: 1rem;
    color: var(--default-color);
}

.note-meta {
    display: flex;
    justify-content: space-between;
    margin-bottom: 1rem;
    color: var(--gray-color);
    font-size: 0.9rem;
}

.note-professor {
    display: flex;
    align-items: center;
    margin-bottom: 1rem;
}

.note-professor i {
    margin-left: 0.5rem;
    color: var(--default-color);
}

.note-actions {
    display: flex;
    justify-content: flex-end;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    padding: 0.6rem 1.2rem;
    background-color: var(--default-color);
    color: white;
    text-decoration: none;
    border-radius: 6px;
    transition: all 0.3s ease;
}

.download-btn i {
    margin-left: 0.5rem;
}

.download-btn:hover {
    background-color: #34495e;
    transform: translateY(-2px);
}

/* رنگ دکمه دانلود بر اساس رشته */
.note-card[data-major="computer-science"] .download-btn {
    background-color: var(--computer-science-color);
}

.note-card[data-major="electrical-engineering"] .download-btn {
    background-color: var(--electrical-engineering-color);
}

.note-card[data-major="mechanical-engineering"] .download-btn {
    background-color: var(--mechanical-engineering-color);
}

.note-card[data-major="civil-engineering"] .download-btn {
    background-color: var(--civil-engineering-color);
}

/* فوتر */
footer {
    background-color: var(--default-color);
    color: white;
    padding: 3rem 0 0;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.footer-section h3 {
    margin-bottom: 1.5rem;
    position: relative;
    padding-bottom: 0.5rem;
}

.footer-section h3::after {
    content: '';
    position: absolute;
    bottom: 0;
    right: 0;
    width: 50px;
    height: 2px;
    background-color: var(--light-color);
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.8rem;
}

.footer-section ul li a {
    color: #ddd;
    text-decoration: none;
    transition: all 0.3s ease;
}

.footer-section ul li a:hover {
    color: white;
    padding-right: 5px;
}

.footer-section ul li i {
    margin-left: 0.5rem;
    width: 20px;
    text-align: center;
}

.copyright {
    text-align: center;
    padding: 1.5rem;
    margin-top: 2rem;
    background-color: rgba(0, 0, 0, 0.2);
    font-size: 0.9rem;
}

/* رسپانسیو */
@media (max-width: 768px) {
    .navbar {
        flex-direction: column;
        padding: 1rem;
    }
    
    .nav-links {
        margin: 1rem 0;
    }
    
    .notes-grid {
        grid-template-columns: 1fr;
    }
    
    .filter-group {
        flex-direction: column;
        align-items: stretch;
        border-radius: 8px;
    }
    
    .filter-group label {
        margin-bottom: 0.5rem;
        margin-left: 0;
    }
}