:root {
    --background: #f5f5f7;
    --card-background: #ffffff;
    --card-hover-background: #ffffff;
    --text-primary: #1d1d1f;
    --text-secondary: #6e6e73;
    --border-color: rgba(0, 0, 0, 0.04);
    --border-hover-color: rgba(0, 0, 0, 0.08);
    --shadow: rgba(0, 0, 0, 0.02);
    --shadow-hover: rgba(0, 0, 0, 0.06);
}

@media (prefers-color-scheme: dark) {
    :root {
        --background: #1a1a1a;
        --card-background: #2d2d2d;
        --card-hover-background: #353535;
        --text-primary: #ffffff;
        --text-secondary: #a1a1a6;
        --border-color: rgba(255, 255, 255, 0.05);
        --border-hover-color: rgba(255, 255, 255, 0.1);
        --shadow: rgba(0, 0, 0, 0.2);
        --shadow-hover: rgba(0, 0, 0, 0.3);
    }
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--background);
    min-height: 100vh;
    padding: 2rem;
    color: var(--text-primary);
}

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

h1 {
    color: var(--text-primary);
    text-align: center;
    margin-bottom: 3rem;
    font-size: 2.5rem;
    font-weight: 700;
    position: relative;
}

h1::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: #0071e3;
    border-radius: 2px;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
    padding: 1rem;
}

.project-card {
    background: var(--card-background);
    border-radius: 16px;
    padding: 1.75rem;
    transition: all 0.3s ease;
    cursor: pointer;
    box-shadow: 0 4px 6px var(--shadow);
    border: 1px solid var(--border-color);
    text-decoration: none;
    display: flex;
    flex-direction: column;
    min-height: 180px;
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 24px var(--shadow-hover);
    border-color: var(--border-hover-color);
    background: var(--card-hover-background);
}

.project-card h2 {
    color: var(--text-primary);
    font-size: 1.25rem;
    font-weight: 600;
    text-align: center;
    margin-bottom: 1rem;
}

.project-info {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    font-size: 0.9rem;
}

.type {
    background: #0071e3;
    color: white;
    padding: 0.2rem 0.6rem;
    border-radius: 12px;
    font-size: 0.8rem;
    align-self: center;
}

.date {
    color: var(--text-secondary);
    font-size: 0.8rem;
    text-align: center;
}

.description {
    color: var(--text-secondary);
    text-align: center;
    margin: 0.5rem 0;
}

.technologies {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: center;
    margin-top: 0.5rem;
}

.tech-tag {
    background: var(--border-color);
    color: var(--text-secondary);
    padding: 0.2rem 0.6rem;
    border-radius: 12px;
    font-size: 0.8rem;
}

@media (max-width: 768px) {
    body {
        padding: 1rem;
    }

    h1 {
        font-size: 2rem;
        margin-bottom: 2rem;
    }

    .projects-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
}

.error-message {
    grid-column: 1 / -1;
    text-align: center;
    padding: 2rem;
    background: var(--card-background);
    border-radius: 16px;
    border: 1px solid var(--border-color);
}