:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --bg-color: #ffffff;
    --text-color: #1f2937;
    --text-muted: #6b7280;
    --border-color: #e5e7eb;
    --card-bg: #f9fafb;
    --max-width: 1100px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 2rem;
}

/* Header & Navigation */
header {
    height: 80px;
    display: flex;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(8px);
    z-index: 100;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

nav ul {
    display: flex;
    list-style: none;
    gap: 2rem;
}

nav a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: color 0.2s;
}

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

/* Hero Section */
#hero {
    padding: 100px 0;
    text-align: center;
}

.profile-img {
    width: 250px;
    height: auto;
    border-radius: 12px;
    object-fit: cover;
    margin-bottom: 2rem;
    border: 4px solid var(--primary-color);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

.hero-content h1 {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
    line-height: 1.2;
}

.highlight {
    color: var(--primary-color);
}

.hero-content p {
    font-size: 1.25rem;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto 2.5rem;
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
}

.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.2s;
}

.btn.primary {
    background-color: var(--primary-color);
    color: white;
}

.btn.primary:hover {
    background-color: var(--primary-hover);
}

.btn.secondary {
    border: 1px solid var(--border-color);
    color: var(--text-color);
}

.btn.secondary:hover {
    background-color: var(--card-bg);
}

/* Sections General */
section {
    padding: 80px 0;
}

h2 {
    font-size: 2.25rem;
    margin-bottom: 2rem;
    position: relative;
    padding-bottom: 0.5rem;
}

h2::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 50px;
    height: 4px;
    background-color: var(--primary-color);
}

/* About Section */
.about-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 4rem;
    align-items: start;
}

.about-text p {
    margin-bottom: 1.5rem;
}

.skills-card {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.skills-card h3 {
    margin-bottom: 1.25rem;
}

.skills-list {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.skills-list li {
    background: white;
    padding: 0.4rem 0.8rem;
    border-radius: 4px;
    font-size: 0.9rem;
    border: 1px solid var(--border-color);
}

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

.project-card {
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    transition: transform 0.2s, box-shadow 0.2s;
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

.project-img-placeholder {
    height: 200px;
    background-color: #e5e7eb;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #9ca3af;
    font-weight: 600;
}

.project-info {
    padding: 1.5rem;
}

.project-info h3 {
    margin-bottom: 0.5rem;
}

.project-info p {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 1.25rem;
}

.project-link {
    text-decoration: none;
    color: var(--primary-color);
    font-weight: 600;
}

/* Contact Section */
#contact {
    text-align: center;
}

#contact p {
    margin-bottom: 2rem;
    color: var(--text-muted);
}

.contact-links {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
}

.contact-item {
    font-size: 1.5rem;
    text-decoration: none;
    color: var(--text-color);
    font-weight: 600;
}

.social-links {
    display: flex;
    gap: 2rem;
}

.social-links a {
    text-decoration: none;
    color: var(--primary-color);
    font-weight: 500;
}

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

/* Responsive */
@media (max-width: 768px) {
    .about-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .hero-content h1 {
        font-size: 2.5rem;
    }

    nav ul {
        display: none; /* In a real site, you'd add a mobile menu here */
    }
}