:root {
    --primary-blue: #0056b3;
    --primary-red: #d9534f;
    --background-white: #ffffff;
    --text-black: #212529;
    --light-gray: #f8f9fa;
    --dark-gray: #343a40;
    --transition-speed: 0.3s;
    --container-width: 1100px;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-black);
    background-color: var(--background-white);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Navbar styles */
header {
    background: var(--background-white);
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

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

.logo span {
    color: var(--primary-red);
}

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

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

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

/* Footer styles */
footer {
    background: var(--dark-gray);
    color: var(--background-white);
    padding: 3rem 0;
    margin-top: auto;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255,255,255,0.1);
    margin-top: 2rem;
    font-size: 0.9rem;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: 5px;
    font-weight: 600;
    cursor: pointer;
    transition: background var(--transition-speed), transform 0.1s;
    border: none;
}

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

.btn-primary:hover {
    background: #004494;
}

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

.btn-danger:hover {
    background: #c9302c;
}

/* Hero Section */
.hero {
    padding: 6rem 0;
    text-align: center;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1.5rem;
}

.hero p {
    font-size: 1.25rem;
    color: var(--dark-gray);
    max-width: 600px;
    margin: 0 auto 2rem;
}

/* Skills Grid */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    padding: 2rem 0;
}

.skill-card {
    background: var(--light-gray);
    padding: 1.5rem;
    border-radius: 8px;
    border-left: 4px solid var(--primary-blue);
}

.skill-card h3 {
    margin-bottom: 0.5rem;
}

/* Utility Classes */
.py-4 { padding-top: 4rem; padding-bottom: 4rem; }
.mt-4 { margin-top: 2rem; }
.text-center { text-align: center; }
.lead { font-size: 1.25rem; color: #666; margin-bottom: 1.5rem; }

/* Contact Form Styles */
.contact-form {
    max-width: 600px;
    margin: 0 auto;
    background: var(--light-gray);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.form-group input, .form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-family: inherit;
    font-size: 1rem;
}

.form-group input:focus, .form-group textarea:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 2px rgba(0,86,179,0.1);
}

/* Timeline */
.timeline {
    border-left: 2px solid var(--primary-blue);
    padding-left: 2rem;
    margin-left: 1rem;
}

.timeline-item {
    position: relative;
    margin-bottom: 2rem;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: calc(-2rem - 6px);
    top: 0.5rem;
    width: 10px;
    height: 10px;
    background: var(--primary-blue);
    border-radius: 50%;
}

/* Mobile Responsive Refinement */
@media (max-width: 768px) {
    .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: var(--background-white);
        padding: 1rem;
        box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    }

    .nav-links.active {
        display: flex;
    }

    .mobile-toggle {
        display: flex;
        flex-direction: column;
        gap: 5px;
        cursor: pointer;
    }

    .mobile-toggle span {
        width: 25px;
        height: 3px;
        background: var(--dark-gray);
        transition: 0.3s;
    }

    .mobile-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 6px); }
    .mobile-toggle.active span:nth-child(2) { opacity: 0; }
    .mobile-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -6px); }

    .hero h1 { font-size: 2.25rem; }
}