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

:root {
    --primary-gray: #2a2a2a;
    --light-gray: #f5f5f5;
    --medium-gray: #8a8a8a;
    --dark-gray: #1a1a1a;
    --accent-gray: #d0d0d0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--primary-gray);
    background-color: var(--light-gray);
}

.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: rgba(245, 245, 245, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    z-index: 1000;
    padding: 1rem 0;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.2rem;
    font-weight: 700;
    letter-spacing: 2px;
    color: var(--primary-gray);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2.5rem;
}

.nav-link {
    text-decoration: none;
    color: var(--medium-gray);
    font-size: 0.9rem;
    font-weight: 500;
    letter-spacing: 1px;
    transition: color 0.3s ease;
}

.nav-link:hover {
    color: var(--primary-gray);
}

.hero {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: url('../images/background.JPG') center 65% no-repeat;
    background-size: 125%;
    position: relative;
    text-align: center;
    padding-top: 60px;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(42, 42, 42, 0.35);
    z-index: 1;
}

.hero-content {
    animation: fadeInUp 1s ease;
    position: relative;
    z-index: 2;
}

.hero-title {
    font-size: 4rem;
    font-weight: 700;
    letter-spacing: 8px;
    color: #ffffff;
    margin-bottom: 1rem;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
}

.hero-subtitle {
    font-size: 1.5rem;
    color: #ffffff;
    letter-spacing: 3px;
    font-weight: 300;
    text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.5);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

section {
    padding: 6rem 0;
}

.section-title {
    font-size: 3.5rem;
    font-weight: 700;
    letter-spacing: 6px;
    color: var(--primary-gray);
    margin-bottom: 3rem;
    text-align: center;
}

.about-section {
    background-color: #ffffff;
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--medium-gray);
}

.about-content p {
    margin-bottom: 1.5rem;
}

.projects-section {
    background-color: var(--light-gray);
}

.filter-container {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    margin-bottom: 2rem;
}

.filter-container label {
    font-size: 1rem;
    font-weight: 500;
    color: var(--primary-gray);
    letter-spacing: 1px;
}

.category-dropdown {
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-family: inherit;
    color: var(--primary-gray);
    background-color: #ffffff;
    border: 2px solid var(--accent-gray);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    outline: none;
    letter-spacing: 0.5px;
}

.category-dropdown:hover {
    border-color: var(--medium-gray);
    background-color: var(--light-gray);
}

.category-dropdown:focus {
    border-color: var(--primary-gray);
    box-shadow: 0 0 0 3px rgba(42, 42, 42, 0.1);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.project-card {
    background: #ffffff;
    border-radius: 8px;
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease, opacity 0.3s ease;
    cursor: pointer;
    text-decoration: none;
    color: inherit;
    display: block;
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.project-card.hidden {
    display: none;
}

.project-image-placeholder {
    width: 100%;
    height: 200px;
    background: linear-gradient(135deg, #d0d0d0 0%, #e8e8e8 100%);
}

.project-card h3 {
    padding: 1.5rem 1.5rem 0.5rem;
    font-size: 1.3rem;
    color: var(--primary-gray);
    letter-spacing: 1px;
}

.project-year {
    padding: 0 1.5rem;
    font-size: 0.9rem;
    color: var(--medium-gray);
    margin-bottom: 0.5rem;
}

.project-description {
    padding: 0 1.5rem 1.5rem;
    color: var(--medium-gray);
    line-height: 1.6;
}

.social-section {
    background-color: #ffffff;
}

.social-content {
    max-width: 800px;
    margin: 0 auto;
}

.social-links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.social-link {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-decoration: none;
    padding: 2rem;
    background-color: var(--light-gray);
    border-radius: 8px;
    transition: transform 0.3s ease, background-color 0.3s ease;
    color: var(--primary-gray);
}

.social-link:hover {
    transform: translateY(-5px);
    background-color: var(--accent-gray);
}

.social-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.social-link span {
    font-size: 1.1rem;
    font-weight: 500;
    letter-spacing: 1px;
}

.footer {
    background-color: var(--dark-gray);
    color: var(--accent-gray);
    text-align: center;
    padding: 2rem 0;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        gap: 1.5rem;
    }

    .nav-link {
        font-size: 0.8rem;
    }

    .hero-title {
        font-size: 2.5rem;
        letter-spacing: 4px;
    }

    .hero-subtitle {
        font-size: 1.2rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .filter-container {
        flex-direction: column;
        gap: 0.5rem;
    }

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

@media (max-width: 480px) {
    .logo {
        font-size: 1rem;
    }

    .nav-menu {
        gap: 1rem;
    }

    .nav-link {
        font-size: 0.7rem;
    }

    .hero-title {
        font-size: 2rem;
        letter-spacing: 3px;
    }

    .hero-subtitle {
        font-size: 1rem;
    }
}