/* Professional Minimalist Style for James Sun */

:root {
    --bg-color: #FFFFFF;
    --text-primary: #1A1A1A;
    --text-secondary: #666666;
    --accent-color: #0056b3;
    --border-color: #EEEEEE;
    --section-spacing: 80px;
    --container-width: 1100px;
    --transition: all 0.3s ease;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    scroll-behavior: smooth;
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* Header & Navigation */
header {
    position: sticky;
    top: 0;
    background-color: rgba(255, 255, 255, 0.95);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    padding: 20px 0;
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.5px;
}

nav ul {
    display: flex;
    list-style: none;
    gap: 30px;
}

nav ul li a {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    transition: var(--transition);
}

nav ul li a:hover {
    color: var(--accent-color);
}

/* Hero Section */
.hero {
    padding: 100px 20px;
    text-align: center;
}

.profile-image-container {
    width: 180px;
    height: 180px;
    margin: 0 auto 30px;
    border-radius: 50%;
    overflow: hidden;
    border: 4px solid var(--bg-color);
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
}

.profile-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 10px;
    letter-spacing: -1px;
}

.tagline {
    font-size: 1.2rem;
    color: var(--text-secondary);
}

/* Sections Common */
section {
    padding: var(--section-spacing) 0;
}

section h2 {
    font-size: 2rem;
    text-align: center;
    margin-bottom: 40px;
    position: relative;
}

section h2::after {
    content: '';
    display: block;
    width: 50px;
    height: 3px;
    background: var(--accent-color);
    margin: 15px auto 0;
}

/* About Section */
.about-text {
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
    font-size: 1.1rem;
    color: var(--text-secondary);
}

.about-text p {
    margin-bottom: 20px;
}

/* Skills Section */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 30px;
}

.skill-card {
    padding: 40px 30px;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    text-align: center;
    transition: var(--transition);
}

.skill-card:hover {
    border-color: var(--accent-color);
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.05);
}

.skill-card i {
    font-size: 2rem;
    color: var(--accent-color);
    margin-bottom: 20px;
}

.skill-card h3 {
    margin-bottom: 15px;
}

.skill-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Contact Section */
.contact-wrapper {
    display: flex;
    justify-content: space-around;
    align-items: center;
    flex-wrap: wrap;
    gap: 40px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.info-item {
    display: flex;
    align-items: center;
    gap: 15px;
    font-size: 1.1rem;
}

.info-item i {
    color: var(--accent-color);
    width: 20px;
    text-align: center;
}

.social-links {
    display: flex;
    gap: 20px;
}

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    font-size: 1.3rem;
    text-decoration: none;
    transition: var(--transition);
}

.social-links a:hover {
    background: var(--accent-color);
    color: #FFFFFF;
    border-color: var(--accent-color);
}

/* Footer */
footer {
    padding: 40px 0;
    text-align: center;
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.2rem;
    }

    nav ul {
        gap: 15px;
    }

    .contact-wrapper {
        flex-direction: column;
        text-align: center;
    }

    .info-item {
        justify-content: center;
    }
}