:root {
    --primary-color: #2563eb;
    --secondary-color: #1e40af;
    --text-color: #1f2937;
    --text-light: #6b7280;
    --bg-color: #ffffff;
    --bg-light: #f9fafb;
    --border-color: #e5e7eb;
    --success-color: #10b981;
    --error-color: #ef4444;
}

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

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

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

/* Navbar */
.navbar {
    background: var(--bg-color);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 20px;
}

.logo a {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
    text-decoration: none;
}

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

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

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

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--text-color);
    margin: 3px 0;
    transition: 0.3s;
}

/* Hero Section */
.hero {
    padding: 100px 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.hero-content {
    text-align: center;
}

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

.hero h2 {
    font-size: 1.8rem;
    font-weight: 400;
    margin-bottom: 1rem;
    opacity: 0.9;
}

.hero-description {
    font-size: 1.2rem;
    max-width: 600px;
    margin: 0 auto 2rem;
    opacity: 0.9;
}

.highlight {
    color: #fbbf24;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-bottom: 2rem;
}

.btn {
    padding: 12px 30px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s;
    display: inline-block;
    border: none;
    cursor: pointer;
}

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

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

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

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

.btn-small {
    padding: 8px 16px;
    font-size: 0.9rem;
}

.social-links {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    margin-top: 2rem;
}

.social-links a {
    color: white;
    font-size: 1.5rem;
    transition: transform 0.3s;
}

.social-links a:hover {
    transform: translateY(-3px);
}

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

section h2 {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 3rem;
    color: var(--text-color);
}

/* Skills */
.skills-preview {
    background: var(--bg-light);
}

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

.skill-card {
    background: white;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.skill-card h3 {
    margin-bottom: 1rem;
    color: var(--text-color);
}

.skill-bar {
    height: 8px;
    background: var(--border-color);
    border-radius: 4px;
    overflow: hidden;
}

.skill-progress {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transition: width 1s ease;
}

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

.project-card {
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s;
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
}

.project-image {
    height: 200px;
    background: var(--bg-light);
    display: flex;
    align-items: center;
    justify-content: center;
}

.placeholder-image {
    font-size: 3rem;
    color: var(--text-light);
}

.project-content {
    padding: 1.5rem;
}

.project-card h3 {
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.project-card p {
    color: var(--text-light);
    margin-bottom: 1rem;
}

.tech-stack {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.tech-tag {
    background: var(--bg-light);
    padding: 4px 12px;
    border-radius: 4px;
    font-size: 0.85rem;
    color: var(--text-color);
}

.project-links {
    display: flex;
    gap: 1rem;
}

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

.project-links a:hover {
    text-decoration: underline;
}

/* Page Header */
.page-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 60px 0;
    text-align: center;
}

.page-header h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

/* About Page */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

.about-text h2 {
    text-align: left;
    margin-bottom: 1rem;
}

.about-text p {
    margin-bottom: 1rem;
    color: var(--text-light);
    line-height: 1.8;
}

.contact-info {
    margin-top: 2rem;
}

.contact-info p {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}

.contact-info i {
    color: var(--primary-color);
    width: 20px;
}

.skills-section h2 {
    text-align: left;
    margin-bottom: 2rem;
}

.skill-item {
    margin-bottom: 1.5rem;
}

.skill-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

/* Experience Timeline */
.experience-section {
    background: var(--bg-light);
}

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

.timeline-item {
    position: relative;
    padding-left: 2rem;
    padding-bottom: 2rem;
    border-left: 2px solid var(--primary-color);
}

.timeline-item:last-child {
    border-left: none;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -6px;
    top: 0;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--primary-color);
}

.timeline-content h3 {
    margin-bottom: 0.5rem;
}

.timeline-content h4 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.period {
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

/* Contact Page */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
}

.contact-info h2,
.contact-form-container h2 {
    text-align: left;
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
}

.contact-methods {
    margin-top: 2rem;
}

.contact-method {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    align-items: flex-start;
}

.contact-method i {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-top: 0.2rem;
}

.contact-method h4 {
    margin-bottom: 0.25rem;
}

.contact-method a {
    color: var(--primary-color);
    text-decoration: none;
}

.contact-method a:hover {
    text-decoration: underline;
}

/* Contact Form */
.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
}

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

.form-group input,
.form-group textarea {
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-family: inherit;
    font-size: 1rem;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-message {
    margin-top: 1rem;
    padding: 1rem;
    border-radius: 6px;
    display: none;
}

.form-message.success {
    background: #d1fae5;
    color: var(--success-color);
    display: block;
}

.form-message.error {
    background: #fee2e2;
    color: var(--error-color);
    display: block;
}

/* 404 Page */
.error-page {
    padding: 100px 0;
    text-align: center;
}

.error-content {
    max-width: 600px;
    margin: 0 auto;
}

.error-code {
    font-size: 8rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.error-content h2 {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.error-content p {
    color: var(--text-light);
    margin-bottom: 2rem;
}

/* Footer */
.footer {
    background: var(--text-color);
    color: white;
    padding: 3rem 0 1rem;
    margin-top: 4rem;
}

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

.footer-section h3,
.footer-section h4 {
    margin-bottom: 1rem;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
}

.footer-section a:hover {
    color: white;
}

.footer .social-links a {
    color: white;
}

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

.text-center {
    text-align: center;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 1rem;
        box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    }

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

    .hero h1 {
        font-size: 2rem;
    }

    .hero h2 {
        font-size: 1.3rem;
    }

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

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

    .projects-grid {
        grid-template-columns: 1fr;
    }

    section h2 {
        font-size: 2rem;
    }
}