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

:root {
    --primary-color: #2563eb;
    --secondary-color: #1e40af;
    --text-color: #1f2937;
    --text-light: #6b7280;
    --bg-color: #f9fafb;
    --card-bg: #ffffff;
    --border-color: #e5e7eb;
    --hover-color: #dbeafe;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

/* Header */
header {
    text-align: center;
    padding: 3rem 0;
    border-bottom: 2px solid var(--border-color);
    margin-bottom: 3rem;
}

header h1 {
    font-size: 2.5rem;
    color: var(--text-color);
    margin-bottom: 0.5rem;
}

.subtitle {
    font-size: 1.125rem;
    color: var(--text-light);
    font-weight: 400;
}

/* Sections */
section {
    margin-bottom: 3rem;
}

h2 {
    font-size: 1.875rem;
    color: var(--text-color);
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--primary-color);
}

/* About Section */
.about p {
    font-size: 1.125rem;
    color: var(--text-light);
    line-height: 1.8;
}

/* Project Cards */
.project-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 2rem;
    margin-bottom: 2rem;
    transition: box-shadow 0.3s ease, transform 0.3s ease;
}

.project-card:hover {
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    transform: translateY(-2px);
}

.project-card h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.project-card h3 a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

.project-card h3 a:hover {
    color: var(--secondary-color);
    cursor: pointer;
}

.project-tagline {
    font-size: 1rem;
    color: var(--text-light);
    font-style: italic;
    margin-bottom: 1rem;
}

.project-description {
    font-size: 1rem;
    color: var(--text-color);
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

/* Features */
.features {
    margin: 1.5rem 0;
}

.features h4 {
    font-size: 1rem;
    color: var(--text-color);
    margin-bottom: 0.75rem;
    font-weight: 600;
}

.features ul {
    list-style: none;
    padding-left: 0;
}

.features li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
    color: var(--text-light);
}

.features li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
}

/* Links */
.links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.links a {
    display: inline-block;
    padding: 0.5rem 1.25rem;
    background-color: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: 5px;
    font-size: 0.875rem;
    font-weight: 500;
    transition: background-color 0.3s ease, transform 0.2s ease;
}

.links a:hover {
    background-color: var(--secondary-color);
    transform: translateY(-1px);
    cursor: pointer;
}

/* Footer */
footer {
    text-align: center;
    padding: 2rem 0;
    margin-top: 3rem;
    border-top: 1px solid var(--border-color);
    color: var(--text-light);
    font-size: 0.875rem;
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 1.5rem 1rem;
    }

    header h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.5rem;
    }

    .project-card {
        padding: 1.5rem;
    }

    .links {
        flex-direction: column;
    }

    .links a {
        text-align: center;
    }
}