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

:root {
    --primary-blue: #0052CC;
    --dark-blue: #003399;
    --light-blue: #E6F0FF;
    --dark-gray: #2C3E50;
    --medium-gray: #5A6C7D;
    --light-gray: #ECF0F1;
    --white: #FFFFFF;
    --text-dark: #2C3E50;
    --text-light: #5A6C7D;
}

html {
    scroll-behavior: smooth;
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Navigation */
.navbar {
    background-color: var(--dark-gray);
    color: var(--white);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--white);
    letter-spacing: 0.5px;
}

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

.nav-links a {
    color: var(--white);
    text-decoration: none;
    transition: color 0.3s ease;
    font-weight: 500;
}

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

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--dark-gray) 0%, var(--medium-gray) 100%);
    color: var(--white);
    padding: 6rem 0;
    text-align: center;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0.95;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

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

/* Buttons */
.btn {
    padding: 0.75rem 2rem;
    border-radius: 5px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    display: inline-block;
}

.btn-primary {
    background-color: var(--primary-blue);
    color: var(--white);
    border: 2px solid var(--primary-blue);
}

.btn-primary:hover {
    background-color: var(--dark-blue);
    border-color: var(--dark-blue);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 82, 204, 0.3);
}

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

.btn-secondary:hover {
    background-color: var(--white);
    color: var(--dark-gray);
    transform: translateY(-2px);
}

/* About Section */
.about {
    padding: 4rem 0;
    background-color: var(--light-gray);
}

.about h2 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 3rem;
    color: var(--dark-gray);
}

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

.about-card {
    background-color: var(--white);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.08);
    border-top: 4px solid var(--primary-blue);
    transition: transform 0.3s ease;
}

.about-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 20px rgba(0,0,0,0.12);
}

.about-card h3 {
    color: var(--primary-blue);
    margin-bottom: 1rem;
    font-size: 1.25rem;
}

.about-card p {
    color: var(--text-light);
    line-height: 1.8;
}

/* Expertise Section */
.expertise {
    padding: 4rem 0;
    background-color: var(--white);
}

.expertise h2 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 3rem;
    color: var(--dark-gray);
}

.expertise-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.expertise-category {
    background: linear-gradient(135deg, var(--light-blue) 0%, rgba(230, 240, 255, 0.5) 100%);
    padding: 1.75rem;
    border-radius: 8px;
    border-left: 4px solid var(--primary-blue);
}

.expertise-category h3 {
    color: var(--primary-blue);
    margin-bottom: 1.25rem;
    font-size: 1.1rem;
    font-weight: 600;
}

.expertise-category ul {
    list-style: none;
}

.expertise-category li {
    color: var(--text-light);
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
    font-size: 0.95rem;
}

.expertise-category li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--primary-blue);
    font-weight: bold;
}

/* Experience Section */
.experience {
    padding: 4rem 0;
    background-color: var(--light-gray);
}

.experience h2 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 3rem;
    color: var(--dark-gray);
}

.experience-highlights {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.experience-item {
    background-color: var(--white);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.08);
}

.experience-item h4 {
    color: var(--primary-blue);
    font-size: 1.15rem;
    margin-bottom: 1rem;
    border-bottom: 2px solid var(--primary-blue);
    padding-bottom: 0.5rem;
}

.experience-item p {
    color: var(--text-light);
    line-height: 1.8;
}

.certifications {
    background-color: var(--white);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.08);
}

.certifications h3 {
    color: var(--dark-gray);
    margin-bottom: 1.5rem;
    font-size: 1.25rem;
}

.certifications ul {
    list-style: none;
}

.certifications li {
    color: var(--text-light);
    padding: 0.75rem 0;
    padding-left: 1.5rem;
    position: relative;
}

.certifications li:before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--primary-blue);
    font-weight: bold;
}

/* Contact Section */
.contact {
    padding: 4rem 0;
    background: linear-gradient(135deg, var(--dark-gray) 0%, var(--medium-gray) 100%);
    color: var(--white);
}

.contact h2 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 1rem;
}

.contact-intro {
    text-align: center;
    font-size: 1.1rem;
    margin-bottom: 2.5rem;
    opacity: 0.95;
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
}

.contact-method {
    background-color: rgba(255,255,255,0.1);
    padding: 1.75rem;
    border-radius: 8px;
    text-align: center;
    border: 1px solid rgba(255,255,255,0.2);
    transition: all 0.3s ease;
}

.contact-method:hover {
    background-color: rgba(255,255,255,0.15);
    transform: translateY(-5px);
}

.contact-method h4 {
    color: var(--primary-blue);
    margin-bottom: 0.75rem;
    font-size: 1.1rem;
}

.contact-method p {
    color: var(--white);
    font-size: 1rem;
}

.contact-method a {
    color: var(--white);
    text-decoration: none;
    transition: color 0.3s ease;
}

.contact-method a:hover {
    color: var(--primary-blue);
    text-decoration: underline;
}

/* Footer */
.footer {
    background-color: var(--dark-gray);
    color: var(--white);
    text-align: center;
    padding: 2rem 0;
    border-top: 1px solid rgba(255,255,255,0.1);
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .nav-links {
        gap: 1rem;
        font-size: 0.9rem;
    }

    .about h2,
    .expertise h2,
    .experience h2,
    .contact h2 {
        font-size: 1.5rem;
    }

    .about-grid,
    .expertise-grid,
    .contact-grid {
        grid-template-columns: 1fr;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        max-width: 300px;
    }
}

/* Print Styles */
@media print {
    .navbar,
    .hero-buttons,
    .footer {
        display: none;
    }
}