/* --- Variables --- */
:root {
    --primary-color: #1a365d; /* Deep Navy Blue */
    --secondary-color: #2b6cb0; /* Professional Mid-Blue */
    --accent-color: #4a5568; /* Slate Grey */
    --text-color: #2d3748; /* Dark Grey for primary text */
    --text-light: #718096; /* Medium Grey for secondary text */
    --bg-color: #ffffff; /* Clean White */
    --bg-light: #edf2f7; /* Soft Cool Grey for alternating sections */
    --border-color: #e2e8f0; /* Crisp Light Grey for borders */
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --transition: all 0.3s ease;
}

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

body {
    font-family: var(--font-main);
    color: var(--text-color);
    line-height: 1.6;
    background-color: var(--bg-color);
}

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

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

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

.section-title {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 3rem;
    text-align: center;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.mt-2 { margin-top: 2rem; }

/* --- Buttons --- */
.btn {
    display: inline-block;
    padding: 12px 28px;
    border-radius: 4px; /* Sharper corners for a corporate look */
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
}

.btn-primary {
    background-color: var(--secondary-color);
    color: #fff;
    border: 1px solid var(--secondary-color);
}

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

.btn-outline {
    background-color: transparent;
    color: var(--secondary-color);
    border: 2px solid var(--secondary-color);
}

.btn-outline:hover {
    background-color: var(--bg-light);
    color: var(--primary-color);
    border-color: var(--primary-color);
}

/* --- Navigation --- */
.navbar {
    background-color: #ffffff;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05); /* Softer, highly professional shadow */
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 18px 20px;
    max-width: 1100px;
    margin: 0 auto;
}

.logo {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--primary-color);
    letter-spacing: -0.5px;
}

.nav-links {
    list-style: none;
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-links a {
    color: var(--accent-color);
    font-weight: 600;
    font-size: 0.95rem;
}

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

/* --- Hero Section --- */
.hero {
    padding: 200px 0 120px;
    background: linear-gradient(to bottom, var(--bg-light), #ffffff); /* Subtle gradient */
    text-align: center;
    border-bottom: 1px solid var(--border-color);
}

.hero h1 {
    font-size: 3.2rem;
    color: var(--primary-color);
    line-height: 1.25;
    margin-bottom: 24px;
    font-weight: 700;
    letter-spacing: -1px;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--text-light);
    max-width: 800px;
    margin: 0 auto 40px;
    line-height: 1.7;
}

/* --- Portfolio Section --- */
.portfolio {
    padding: 100px 0;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.card {
    background: #fff;
    padding: 35px 30px;
    border-radius: 6px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.02);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 20px rgba(0,0,0,0.06);
    border-color: var(--secondary-color); /* Highlight border on hover */
}

.card h3 {
    color: var(--primary-color);
    margin-bottom: 15px;
    font-size: 1.3rem;
    font-weight: 600;
}

.card p {
    color: var(--text-light);
    margin-bottom: 12px;
    font-size: 0.95rem;
}

.card strong {
    color: var(--text-color);
}

/* --- Experience Section --- */
.experience {
    padding: 100px 0;
}

.bg-light {
    background-color: var(--bg-light);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.timeline {
    max-width: 800px;
    margin: 0 auto;
}

.timeline-item {
    margin-bottom: 45px;
    padding-left: 25px;
    border-left: 3px solid var(--secondary-color);
}

.timeline-item h3 {
    color: var(--primary-color);
    margin-bottom: 12px;
    font-size: 1.4rem;
}

.timeline-item p {
    color: var(--text-light);
    font-size: 1.05rem;
}

.resume-download {
    text-align: center;
    margin-top: 60px;
}

/* --- About Section --- */
.about {
    padding: 100px 0;
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
}

.about-text h3 {
    color: var(--primary-color);
    margin-bottom: 15px;
    font-size: 1.4rem;
    border-bottom: 2px solid var(--bg-light);
    padding-bottom: 8px;
    display: inline-block;
}

.about-text p {
    margin-bottom: 24px;
    font-size: 1.05rem;
    color: var(--text-light);
}

/* --- Footer --- */
.footer {
    background-color: var(--primary-color);
    color: #fff;
    padding: 70px 0 40px;
    text-align: center;
}

.footer h2 {
    margin-bottom: 20px;
    color: #fff;
}

.footer p {
    color: var(--accent-color);
}

.contact-links {
    margin: 35px 0;
    display: flex;
    justify-content: center;
    gap: 35px;
}

.contact-links a, .contact-links span {
    color: #fff;
    font-weight: 500;
    font-size: 1.05rem;
}

.contact-links a:hover {
    color: var(--secondary-color);
}

.copyright {
    margin-top: 50px;
    font-size: 0.9rem;
    border-top: 1px solid rgba(255,255,255,0.05);
    padding-top: 25px;
    color: #718096;
}

/* --- Responsive --- */
@media (max-width: 768px) {
    .hero h1 { font-size: 2.4rem; }
    .nav-links { display: none; }
    .contact-links { flex-direction: column; gap: 15px; }
}