:root {
    --primary-color: #0077B5;
    --secondary-color: #2c3e50;
    --accent-color: #0078D6;
    --text-color: #333;
    --bg-color: #0059ff09;
    --card-bg: #ffffff;
    --header-bg: #ffffff;
    --border-radius: 8px;
    --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
}

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

a:hover {
    color: var(--accent-color);
    text-decoration: underline;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
header {
    background-color: var(--header-bg);
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 1rem 0;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--secondary-color);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 20px;
}

.nav-links a {
    color: var(--secondary-color);
    font-weight: 500;
}

.nav-links a:hover {
    color: var(--primary-color);
}

/* Hero Section */
.hero {
    background-color: var(--card-bg);
    padding: 4rem 0;
    text-align: center;
    margin-bottom: 2rem;
}

.hero-layout {
    display: grid;
    grid-template-columns: 220px 1fr;
    gap: 2rem;
    align-items: center;
    text-align: left;
}

.hero-photo {
    display: flex;
    justify-content: center;
}

.hero-photo img {
    width: 220px;
    height: 220px;
    object-fit: cover;
    border-radius: 18px;
    box-shadow: var(--box-shadow);
}

.hero-content {
    text-align: left;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    color: var(--secondary-color);
}

.hero p {
    font-size: 1.0rem;
    color: #666;
    font-style: bold;
    max-width: 800px;
    margin: 0 auto 1.5rem;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-top: 1rem;
}

.social-links.align-left {
    justify-content: flex-start;
}

.text-align-left {
    text-align: left;
}

.social-links img {
    height: 28px;
}

/* Sections */
section {
    padding: 3rem 0;
    margin-bottom: 2rem;
}

h2 {
    font-size: 2rem;
    color: var(--secondary-color);
    margin-bottom: 1.5rem;
    border-bottom: 2px solid var(--primary-color);
    display: inline-block;
    padding-bottom: 0.5rem;
}

/* Cards Grid */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.card {
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 1.2rem;
    box-shadow: var(--box-shadow);
    transition: transform 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
}

.card h3 {
    margin-bottom: 0.5rem;
    color: var(--secondary-color);
}

.card p {
    font-size: 0.85rem;
}

.card-meta {
    font-size: 0.9rem;
    color: #666;
    margin-bottom: 1rem;
    font-style: italic;
}

.card ul {
    font-size: 0.85rem;
    padding-left: 1.4rem;
    margin: 0.75rem 0;
    list-style-position: outside;
}

.card li {
    margin-bottom: 0.4rem;
}

/* Skills */
.skills-category {
    margin-bottom: 2rem;
}

.skills-category h3 {
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

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

/* About: two-column layout */
.about-layout {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 2rem;
    align-items: start;
}

.about-main p {
    margin-bottom: 1rem;
}

.about-side {
    position: relative;
}

.about-skills-card {
    position: sticky;
    top: 92px; /* below sticky header */
    font-size: 0.92rem;
}

.about-skills-card:hover {
    transform: none;
}

.about-skills-card h3 {
    font-size: 1.35rem;
    margin-bottom: 0.75rem;
    border-bottom: 2px solid var(--primary-color);
}

.about-skills-card ul {
    padding-left: 1.4rem;
    margin: 0.45rem 0 1rem;
}

.about-skills-card li {
    margin-bottom: 0.4rem;
}

.about-skills-badges img {
    height: 22px;
}

.about-skills-link {
    display: inline-block;
    margin-top: 0.75rem;
    font-weight: 600;
}

/* Footer */
footer {
    background-color: var(--secondary-color);
    color: white;
    text-align: center;
    padding: 2rem 0;
    margin-top: 3rem;
}

footer a {
    color: #ddd;
}

footer a:hover {
    color: white;
}

/* Responsive */
@media (max-width: 768px) {
    .nav-links {
        display: none; /* Simple hide for mobile for now, can be improved */
    }
    
    .hero h1 {
        font-size: 2rem;
    }

    .hero-layout {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-content {
        text-align: center;
    }

    .hero p {
        margin: 0 auto 1.5rem;
    }

    .about-layout {
        grid-template-columns: 1fr;
        gap: 1.25rem;
    }

    .about-skills-card {
        position: static;
    }
}

/* Referees Table */
.referees-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.2rem;
}

@media (max-width: 768px) {
    .referees-grid {
        grid-template-columns: 1fr;
    }
}

.referee-item {
    font-size: 0.9rem;
    margin-bottom: 1.2rem;
}

code {
    background-color: #f0f0f0;
    padding: 2px 4px;
    border-radius: 4px;
    font-family: monospace;
    color: #d63384;
}