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

:root {
    --navy: #1a2e4a;
    --navy-dark: #111e30;
    --blue: #3b82f6;
    --blue-light: #60a5fa;
    --slate: #1e293b;
    --slate-mid: #94a3b8;
    --slate-light: #e2e8f0;
    --white: #ffffff;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background-color: var(--white);
    color: var(--slate);
    line-height: 1.7;
}

/* - Header - */

header {
    background-color: var(--navy);
    color: var(--white);
    padding: 80px 40px;
    border-bottom: 4px solid var(--blue);
}

header h1 {
    font-size: 3rem;
    letter-spacing: -1px;
    font-weight: 700;
}

header p {
    margin-top: 10px;
    font-size: 1.1rem;
    color: var(--slate-mid);
    letter-spacing: 1px;
}

/* - Main Content - */

main {
    max-width: 820px;
    margin: 0 auto;
    padding: 60px 20px;
}

section {
    margin-bottom: 70px;
}

h2 {
    font-size: 1.4rem;
    color: var(--navy);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 16px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--slate-light);
}

p {
    font-size: 1rem;
    color: var(--slate);
    max-width: 680px;
}

/* - Links - */

a {
    color: var(--blue);
    font-weight: 600;
    text-decoration: none;
    border-bottom: 1px solid var(--blue-light);
    transition: color 0.2s ease, border-color 0.2s ease;
}

a:hover {
    color: var(--blue-light);
    border-bottom-color: transparent;
}

/* - Footer - */

footer {
    text-align: center;
    padding: 30px 20px;
    font-size: 0.85rem;
    color: var(--slate-mid);
    border-top: 1px solid var(--slate-light);
}

footer p {
    max-width: 100%;
    text-align: center;
}

/* - Navigation - */

.header-content {
    max-width: 820px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

nav {
    display: flex;
    gap: 28px;
}

nav a {
    color: var(--slate-mid);
    font-size: 0.95rem;
    font-weight: 500;
    letter-spacing: 1px;
    text-transform: uppercase;
    border-bottom: none;
}

nav a:hover {
    color: var(--white);
    border-bottom: none;
}

/* - Projects - */

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 24px
}

.project-card {
    background-color: var(--white);
    border: 1px solid var(--slate-light);
    border-radius: 8px;
    padding: 28px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    transition: box-shadow 0.2s ease, transform 0.2s ease;
}

.project-card:hover {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    transform: translateY(-2px);
}

.project-card.placeholder {
    border-style: dashed;
    opacity: 0.5;
}

.project-card h3 {
    font-size: 1.1rem;
    color: var(--navy);
    font-weight: 600;
}

.project-card p {
    font-size: 0.95rem;
    color: var(--slate-mid);
    flex-grow: 1;
}

.project-card a {
    font-size: 0.9rem;
    align-self: flex-start;
}

.tags {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.tag {
    background-color: var(--slate-light);
    color: var(--slate);
    font-size: 0.78rem;
    font-weight: 600;
    padding: 4px 10px;
    border-radius: 20px;
    letter-spacing: 0.5px;
}

/* - About - */

.about-grid {
    display: grid;
    grid-template-columns: 1fr 280px;
    gap: 48px;
    align-items: start;
}

.about-text {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.about-sidebar {
    display: flex;
    flex-direction: column;
    gap: 20px;
    background-color: var(--slate-light);
    border-radius: 8px;
    padding: 24px;
}

.fact {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.fact-label {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--slate-mid);
}

.fact-value {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--navy);
}

.card-links {
    display: flex;
    gap: 16px;
    align-items: center;
}

.card-links a:last-child {
    color: var(--slate-mid);
    border-bottom-color: transparent;
    font-weight: 500;
}

/* - Mobile - */

@media (max-width: 600px) {
    header {
        padding: 40px 20px;
    }

    .header-content {
        flex-direction: column;
        align-items: flex-start;
        gap: 20px;
    }

    header h1 {
        font-size: 2rem;
    }

    nav {
        gap: 16px;
    }

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

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