:root {
    --bg: #eef6fb;
    --text: #1f2937;
    --muted: #6b7280;
    --card: #ffffff;        
    --border: #d1e3ef;
    --brand: #4da3d4;       
    --radius: 12px;
    --space: clamp(1rem, 2vw, 1.5rem);
}

* { box-sizing: border-box;}

html { color-scheme: light; }

html {
    scrollbar-gutter: stable both-edges;
    scrollbar-color: var(--brand) var(--border);
    scrollbar-width: thin;
}

body {
    margin: 0;
    min-height: 100dvh;
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
    line-height: 1.6;
    color: var(--text);
    background: var(--bg); 
}

h1, h2 {
    line-height: 1.25;
    margin: 0 0 0.5rem;
}

a {
    color: var(--brand);
    text-decoration: none;
}

a:hover {
  text-decoration: underline;
  filter: brightness(1.1);
}

.site-header {
    position: sticky;
    top: 0;
    background: #f9fcfe;
    border-bottom: 1px solid var(--border);
}

nav ul {
    list-style: none;
    display: flex;
    gap: 1rem;
    padding: 0;
    margin: 0.5rem 0 1rem;
}

nav a {
    padding: 0.4rem 0.6rem;
    border-radius: 6px;
    font-weight: 500;
    color: var(--text);
    transition: background 0.15s ease, transform 0.15s ease;
}

nav a:hover {
    background: rgba(77, 163, 212, 0.15);
    transform: translateY(-1px);
}

.site-header nav{
    max-width: 72rem;
    margin: 0 auto;
    padding: var(--space);
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
}

.site-header h1 {
    font-size: clamp(1.25rem, 2.5vw, 1.75rem);
    margin: 0;
}

.container {
    max-width: 72rem;
    margin: 0 auto;
    padding: var(--space);
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space);
}

.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: var(--space);
    box-shadow: 0 2px 8px rgba(77, 163, 212, 0.1);
    animation: popin 0.25s ease both;
}

@keyframes popin {
    from { transform: scale(0.98); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}

@media (min-width: 768px) {
    .container {
        grid-template-columns: 2fr 1fr;
    }
    .card:first-of-type {
        grid-column: 1 / -1;
    }
}

@media (min-width: 1024px) {
    .container {
        grid-template-columns: 1fr auto 1fr;
        justify-items: center;
    }
    .card:first-of-type {
        grid-column: 1 / -1;
    }
}

@media (max-width: 768px) {
    header h1 {
        font-size: 1.5rem;
        text-align: center;
    }
    nav ul {
        flex-direction: column;
        align-items: center;
        gap: 0.5rem;
    }
    .container {
        grid-template-columns: 1fr;
    }
    .card {
        width: 100%;
    }
    .profile-pic {
        max-width: 150px;
        width: 70%;
    }
    main {
        padding: 1rem;
    }
}

.profile-pic {
    display: block;
    width: clamp(200px, 22vw, 260px);
    height: auto;
    border-radius: 10px;
    border: 3px solid var(--border);
    margin: 0 auto var(--space);
    box-shadow: 0 4px 10px rgba(77, 163, 212, 0.2);
    transition: transform 0.2s ease;
}

.profile-pic:hover {
    transform: scale(1.05);
}

a:focus {
  outline: 2px solid var(--brand);
  outline-offset: 3px;
}


footer {
  max-width: 72rem;
  margin: 0 auto;
  padding: var(--space);
  color: var(--muted);
  font-size: 0.9rem;
  text-align: center;
}