:root {
    --bg: #fafafa;
    --text: #333;
    --text-secondary: #666;
    --link: #0066cc;
    --link-hover: #004499;
    --border: #e0e0e0;
}

[data-theme="dark"] {
    --bg: #1a1a1a;
    --text: #e0e0e0;
    --text-secondary: #999;
    --link: #6db3f2;
    --link-hover: #9dcbf7;
    --border: #333;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    font-size: 16px;
    transition: background 0.3s, color 0.3s;
}

.container {
    max-width: 650px;
    margin: 0 auto;
    padding: 60px 20px;
}

header {
    text-align: center;
    margin-bottom: 50px;
}

.avatar {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    object-fit: cover;
    margin-bottom: 20px;
}

h1 {
    font-size: 1.8rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.tagline {
    color: var(--text-secondary);
    font-size: 1rem;
    margin-bottom: 20px;
}

.social-links {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
    flex-wrap: wrap;
}

.social-links a {
    color: var(--link);
    text-decoration: none;
    font-size: 0.95rem;
}

.social-links a:hover {
    color: var(--link-hover);
    text-decoration: underline;
}

.resume-link {
    padding: 4px 12px;
    border: 1px solid var(--link);
    border-radius: 4px;
}

.resume-link:hover {
    background: var(--link);
    color: var(--bg);
    text-decoration: none;
}

#theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 50%;
    width: 36px;
    height: 36px;
    cursor: pointer;
    z-index: 100;
    transition: background 0.3s, border 0.3s;
}

#theme-toggle::before {
    content: "☀";
    font-size: 14px;
}

[data-theme="dark"] #theme-toggle::before {
    content: "☾";
}

section {
    margin-bottom: 40px;
}

h2 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 15px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-secondary);
}

p {
    margin-bottom: 15px;
}

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

a:hover {
    text-decoration: underline;
}

ul {
    list-style: none;
}

ul li {
    margin-bottom: 12px;
}

.separator {
    color: var(--text-secondary);
    margin: 0 8px;
}

.desc {
    color: var(--text-secondary);
}

footer {
    margin-top: 60px;
    padding-top: 20px;
    border-top: 1px solid var(--border);
    text-align: center;
    font-size: 0.9rem;
}

.interests-link {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.2s;
}

.interests-link:hover {
    color: var(--link);
}

.minimal-header {
    text-align: left;
    margin-bottom: 40px;
}

.back-link {
    display: inline-block;
    color: var(--text-secondary);
    text-decoration: none;
    margin-bottom: 20px;
    font-size: 0.9rem;
}

.back-link:hover {
    color: var(--link);
}

@media (max-width: 480px) {
    .container {
        padding: 40px 15px;
    }

    h1 {
        font-size: 1.5rem;
    }

    .avatar {
        width: 100px;
        height: 100px;
    }
}