:root {
    --bg-color: #f9f9f9;
    --text-color: #333;
    --accent-color: #0066cc;
    --card-bg: #ffffff;
    --border-radius: 8px;
    --font-main: 'Iosevka Aile', monospace;
}

body {
    font-family: var(--font-main);
    font-size: 1.05rem;
    line-height: 1.7;
    margin: 0;
    padding: 0;
    color: var(--text-color);
    background-color: var(--bg-color);
    transition: background-color 0.3s, color 0.3s;
}

a:link, a:visited {
    color: #0066cc;
    text-decoration: none;
}

.container {
    max-width: 720px;
    margin: 40px auto;
    padding: 0 20px;
}

header {
    text-align: center;
    margin-bottom: 40px;
}

img.profile-img {
    border-radius: 50%;
    width: 160px;
    height: 160px;
    object-fit: cover;
    margin-bottom: 20px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    border: 3px solid var(--card-bg);
}

h1 { font-size: 2rem; margin-bottom: 8px; letter-spacing: -0.5px; }
h2 { font-size: 1.1rem; color: var(--text-color); opacity: 0.9; margin-top: 0; font-weight: normal; }
h3 { font-size: 1.25rem; color: var(--text-color); margin-top: 1.5em; margin-bottom: 0.75em; font-weight: bold; }
h4 { font-size: 1.1rem; color: var(--text-color); margin-top: 1.25em; margin-bottom: 0.6em; font-weight: bold; }
h5 { font-size: 1rem; color: var(--text-color); margin-top: 1em; margin-bottom: 0.5em; font-weight: bold; }

.bio {
    background: var(--card-bg);
    padding: 25px;
    border-radius: var(--border-radius);
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
    margin-bottom: 30px;
}

.bio p { text-align: left; margin: 0; }

.section-title {
    display: block;
    text-align: center;
    margin: 0 auto;
    width: fit-content;
    font-size: 1.2rem;
    border-bottom: 2px solid var(--accent-color);
    padding-bottom: 5px;
}

.contact-list {
    list-style: none;
    padding: 0;
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    justify-content: center;
}

.contact-item {
    background: var(--card-bg);
    padding: 12px 20px;
    border-radius: var(--border-radius);
    text-decoration: none;
    color: var(--text-color);
    font-weight: bold;
    transition: transform 0.2s, box-shadow 0.2s;
    display: flex;
    align-items: center;
    gap: 10px;
}

.contact-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    color: var(--accent-color);
}

.cv-link {
    text-align: center;
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid rgba(0,0,0,0.1);
}

.blog-link { text-align: center; margin-top: 20px; }

details.collapsible-section {
    margin-top: 30px;
    border-radius: var(--border-radius);
}

details.collapsible-section summary {
    list-style: none;
    cursor: pointer;
    padding-bottom: 5px;
    margin-bottom: 20px;
    font-size: 1.2rem;
    border-bottom: 2px solid var(--accent-color);
    display: block;
    width: fit-content;
    margin-left: auto;
    margin-right: auto;
    position: relative;
}

details.collapsible-section summary::-webkit-details-marker { display: none; }

details.collapsible-section summary::after {
    content: "▼";
    font-size: 0.8em;
    margin-left: 10px;
    display: inline-block;
    transition: transform 0.3s ease;
}

details.collapsible-section[open] summary::after { transform: rotate(-90deg); }

.collapsible-content {
    background: var(--card-bg);
    padding: 25px;
    border-radius: var(--border-radius);
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
    margin-bottom: 30px;
}

blockquote {
    font-style: italic;
    font-size: 0.9em;
    color: #555;
    padding: 1em 1.5em;
    border-left: 4px solid var(--accent-color);
    background-color: rgba(0, 170, 169, 0.05);
    margin: 2em 0;
}

blockquote p { margin: 0.5em 0; }
blockquote p:last-child { margin-bottom: 0; }

@media (max-width: 600px) {
    h2 { font-size: 1rem; }
    h3 { font-size: 1.1rem; }
    h4 { font-size: 1rem; }
    h5 { font-size: 0.9rem; }
    .section-title { font-size: 1.1rem; }
    .bio p { font-size: 0.95rem; line-height: 1.5; }
    blockquote { font-size: 0.85em; line-height: 1.4; }
    .contact-list { justify-content: center; }
    .bio, .collapsible-content { font-size: 0.9rem; line-height: 1.5; }
    details.collapsible-section summary { font-size: 1.1rem; }
    ul, ol { font-size: 0.95rem; line-height: 1.5; }
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #1a1a1a;
        --text-color: #e0e0e0;
        --accent-color: #4da6ff;
        --card-bg: #252525;
    }
    blockquote { color: #f0ffff !important; }
}