:root {
    --primary-color: #4361ee;
    --primary-dark: #3a56d4;
    --secondary-color: #3f37c9;
    --success-color: #4cc9f0;
    --light-bg: #f8f9fa;
    --dark-bg: #212529;
    --card-bg: #ffffff;
    --text-color: #333333;
    --text-light: #f8f9fa;
    --border-color: #e0e0e0;
    --border-radius: 12px;
    --box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    --transition: all 0.3s ease;
}

.dark-mode {
    --light-bg: #121212;
    --dark-bg: #f8f9fa;
    --card-bg: #1e1e1e;
    --text-color: #e0e0e0;
    --text-light: #333333;
    --border-color: #444;
    --box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

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

body {
    background-color: var(--light-bg);
    color: var(--text-color);
    transition: var(--transition);
    min-height: 100vh;
    padding-bottom: 40px;
    line-height: 1.6;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 20px 0;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    position: relative;
}

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

.header-actions {
    display: flex;
    gap: 15px;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 15px;
}

.logo i {
    font-size: 2.5rem;
}

.logo h1 {
    font-size: 1.8rem;
    font-weight: 700;
}

.theme-toggle {
    background: rgba(255, 255, 255, 0.2);
    border: none;
    border-radius: 30px;
    width: 60px;
    height: 30px;
    position: relative;
    cursor: pointer;
    display: flex;
    align-items: center;
    padding: 0 5px;
}

.toggle-circle {
    position: absolute;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: white;
    transition: transform 0.3s ease;
    left: 3px;
}

.dark-mode .toggle-circle {
    transform: translateX(30px);
}

.search-section {
    padding: 40px 0 20px;
}

.search-container {
    display: flex;
    gap: 15px;
    margin-bottom: 25px;
}

.search-box {
    flex: 1;
    position: relative;
}

.search-box input {
    width: 100%;
    padding: 14px 20px 14px 50px;
    border-radius: var(--border-radius);
    border: 2px solid var(--border-color);
    font-size: 1rem;
    transition: var(--transition);
    background-color: var(--card-bg);
    color: var(--text-color);
}

.search-box input:focus {
    border-color: var(--primary-color);
    outline: none;
    box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.2);
}

.search-box i {
    position: absolute;
    left: 20px;
    top: 50%;
    transform: translateY(-50%);
    color: #aaa;
    font-size: 1.2rem;
}

.filter-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 30px;
    justify-content: center;
}

.filter-btn {
    background-color: var(--card-bg);
    border: 2px solid var(--border-color);
    color: var(--text-color);
    padding: 10px 20px;
    border-radius: 30px;
    cursor: pointer;
    transition: var(--transition);
    font-weight: 500;
}

.filter-btn:hover, .filter-btn.active {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
}

.software-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 25px;
}

.software-card {
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    border: 1px solid var(--border-color);
    position: relative;
}

.software-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
}

.card-img {
    height: 180px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #f0f4ff, #e6eeff);
}

.dark-mode .card-img {
    background: linear-gradient(135deg, #1e3a5f, #0d1b2a);
}

.card-img i {
    font-size: 5rem;
    color: var(--primary-color);
}

.card-content {
    padding: 20px;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.card-content h3 {
    font-size: 1.3rem;
    margin-bottom: 10px;
    color: var(--text-color);
}

.card-content p {
    color: #666;
    font-size: 0.9rem;
    line-height: 1.6;
    margin-bottom: 15px;
    flex-grow: 1;
}

.dark-mode .card-content p {
    color: #aaa;
}

.card-meta {
    display: flex;
    justify-content: space-between;
    color: #777;
    font-size: 0.85rem;
    margin-bottom: 20px;
}

.dark-mode .card-meta {
    color: #999;
}

.download-btn {
    display: block;
    padding: 12px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
    text-decoration: none;
}

.download-btn:hover {
    background-color: var(--primary-dark);
}

.download-btn i {
    margin-right: 8px;
}

.progress-container {
    display: none;
    margin-top: 15px;
    background: #f0f4ff;
    border-radius: 8px;
    overflow: hidden;
}

.dark-mode .progress-container {
    background: #1e3a5f;
}

.progress-bar {
    height: 8px;
    background: var(--success-color);
    width: 0;
    transition: width 0.5s ease;
}

.footer {
    margin-top: 50px;
    color: #777;
    font-size: 0.9rem;
}

.footer-content {
    border-top: 1px solid var(--border-color);
    padding-top: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
}

.footer-links {
    display: flex;
    gap: 20px;
}

.footer-links a {
    color: #666;
    text-decoration: none;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--primary-color);
}

@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 15px;
    }
    
    .header-actions {
        width: 100%;
        justify-content: center;
    }
    
    .software-grid {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    }
}

@media (max-width: 480px) {
    .software-grid {
        grid-template-columns: 1fr;
    }
    
    .logo h1 {
        font-size: 1.5rem;
    }
    
    .filter-buttons {
        justify-content: center;
    }
}