:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --accent-color: #e74c3c;
    --light-color: #ecf0f1;
    --dark-color: #2c3e50;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Roboto', sans-serif;
    background-color: #f5f7fa;
    color: var(--dark-color);
    line-height: 1.6;
}

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

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

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
    z-index: 2;
}

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

.logo i {
    font-size: 2.5rem;
    margin-right: 15px;
    color: var(--accent-color);
}

.logo-text h1 {
    font-family: 'Orbitron', sans-serif;
    font-weight: 700;
    font-size: 1.8rem;
    margin-bottom: 5px;
    letter-spacing: 1px;
}

.logo-text p {
    font-size: 0.9rem;
    opacity: 0.8;
}

.header-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIxMDAlIiBoZWlnaHQ9IjEwMCUiPjxkZWZzPjxwYXR0ZXJuIGlkPSJwYXR0ZXJuIiB3aWR0aD0iNDAiIGhlaWdodD0iNDAiIHBhdHRlcm5Vbml0cz0idXNlclNwYWNlT25Vc2UiIHBhdHRlcm5UcmFuc2Zvcm09InJvdGF0ZSg0NSkiPjxyZWN0IHdpZHRoPSIyMCIgaGVpZ2h0PSIyMCIgZmlsbD0icmdiYSgyNTUsMjU1LDI1NSwwLjA1KSIvPjwvcGF0dGVybj48L2RlZnM+PHJlY3Qgd2lkdGg9IjEwMCUiIGhlaWdodD0iMTAwJSIgZmlsbD0idXJsKCNwYXR0ZXJuKSIvPjwvc3ZnPg==');
    opacity: 0.3;
    z-index: 1;
}

.hero {
    text-align: center;
    padding: 60px 20px;
    background-color: white;
    margin: 20px 0;
    border-radius: 10px;
    box-shadow: var(--shadow);
    position: relative;
    overflow: hidden;
}

.hero h2 {
    font-family: 'Orbitron', sans-serif;
    font-size: 2.5rem;
    margin-bottom: 20px;
    color: var(--primary-color);
    position: relative;
    z-index: 2;
}

.hero p {
    max-width: 700px;
    margin: 0 auto 30px;
    font-size: 1.1rem;
    position: relative;
    z-index: 2;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 70% 30%, rgba(52, 152, 219, 0.1), transparent 60%);
    z-index: 1;
}

.instruments-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 25px;
    margin: 40px 0;
}

.instrument-card {
    background: white;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    position: relative;
    cursor: pointer;
}

.instrument-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.15);
}

.instrument-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 5px;
    background: var(--secondary-color);
}

.instrument-card.vernier::before {
    background: #e74c3c;
}

.instrument-card.micrometer::before {
    background: #2ecc71;
}

.instrument-card.other::before {
    background: #f39c12;
}

.card-image {
    height: 180px;
    background-color: #f8f9fa;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.card-image img {
    max-width: 80%;
    max-height: 80%;
    transition: var(--transition);
}

.instrument-card:hover .card-image img {
    transform: scale(1.05);
}

.card-content {
    padding: 20px;
}

.card-content h3 {
    font-family: 'Orbitron', sans-serif;
    margin-bottom: 10px;
    color: var(--primary-color);
}

.card-content p {
    font-size: 0.9rem;
    color: #7f8c8d;
    margin-bottom: 15px;
}

.card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 15px;
    border-top: 1px solid #eee;
}

.category {
    font-size: 0.8rem;
    padding: 3px 10px;
    border-radius: 20px;
    background-color: var(--light-color);
    color: var(--dark-color);
}

.btn {
    display: inline-block;
    padding: 8px 20px;
    background-color: var(--secondary-color);
    color: white;
    border-radius: 5px;
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    border: none;
    cursor: pointer;
}

.btn:hover {
    background-color: #2980b9;
    transform: translateY(-2px);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--secondary-color);
    color: var(--secondary-color);
}

.btn-outline:hover {
    background-color: var(--secondary-color);
    color: white;
}

.search-bar {
    display: flex;
    margin: 30px 0;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.search-bar input {
    flex: 1;
    padding: 12px 20px;
    border: 2px solid #ddd;
    border-radius: 30px 0 0 30px;
    font-size: 1rem;
    outline: none;
    transition: var(--transition);
}

.search-bar input:focus {
    border-color: var(--secondary-color);
}

.search-bar button {
    padding: 12px 20px;
    background-color: var(--secondary-color);
    color: white;
    border: none;
    border-radius: 0 30px 30px 0;
    cursor: pointer;
    transition: var(--transition);
}

.search-bar button:hover {
    background-color: #2980b9;
}

footer {
    background-color: var(--dark-color);
    color: white;
    text-align: center;
    padding: 30px 0;
    margin-top: 50px;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.social-links {
    display: flex;
    margin: 20px 0;
}

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.1);
    margin: 0 10px;
    color: white;
    transition: var(--transition);
}

.social-links a:hover {
    background-color: var(--accent-color);
    transform: translateY(-3px);
}

.copyright {
    font-size: 0.9rem;
    opacity: 0.7;
}

@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        text-align: center;
    }

    .logo {
        margin-bottom: 20px;
        justify-content: center;
    }

    .hero h2 {
        font-size: 2rem;
    }

    .instruments-grid {
        grid-template-columns: 1fr;
    }
}