/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2563eb;
    --secondary-color: #1e40af;
    --text-color: #1f2937;
    --text-light: #6b7280;
    --bg-color: #ffffff;
    --bg-light: #86efac;
    --border-color: #e5e7eb;
    --max-width: 1200px;
}

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

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

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

/* Navigation */
.navbar {
    background-color: var(--bg-color);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    background-color: rgba(255, 255, 255, 0.95);
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-fill-color: transparent;
}

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

.nav-menu a {
    color: var(--text-color);
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 0.375rem;
}

/* Hero Section */
.hero {
    padding: 6rem 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-align: center;
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.subtitle {
    font-size: 1.5rem;
    margin-bottom: 2rem;
    opacity: 0.95;
}

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

.btn {
    display: inline-block;
    padding: 0.875rem 2rem;
    border-radius: 0.5rem;
    font-weight: 600;
    cursor: pointer;
}

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

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

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

.about h2 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    color: var(--text-color);
}

.about h3 {
    font-size: 1.75rem;
    margin-top: 2rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.about p {
    font-size: 1.125rem;
    color: var(--text-light);
    margin-bottom: 1rem;
    line-height: 1.8;
}

.about ul {
    margin-left: 2rem;
    margin-bottom: 1rem;
}

.about li {
    font-size: 1.125rem;
    color: var(--text-light);
    margin-bottom: 0.5rem;
}

/* Page Header */
.page-header {
    padding: 1.5rem 0 1.5rem;
    background-color: var(--bg-light);
    border-bottom: 1px solid var(--border-color);
}

.page-header h1 {
    font-size: 2.0rem;
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: 0;
}

.page-header .subtitle {
    font-size: 1.5rem;
    color: var(--text-color);
    margin-top: 0;
    margin-bottom: 0;
}

.header-links-section {
    padding: 1rem 0 0.5rem;
    text-align: left;
}

.header-links-section .header-links {
    font-size: 1.125rem;
    margin: 0;
}

.intro {
    font-size: 1.125rem;
    color: var(--text-light);
    margin-top: 1rem;
}

/* Page Content */
.page-content {
    padding: 1.5rem 0;
}

.page-content h2 {
    font-size: 2rem;
    margin-top: 2rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.page-content h3 {
    font-size: 1.5rem;
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
    color: var(--text-color);
}

.page-content p {
    font-size: 1.125rem;
    color: var(--text-color);
    margin-bottom: 1rem;
    line-height: 1.8;
}

.page-content ul {
    margin-left: 2rem;
    margin-bottom: 1.5rem;
}

.page-content li {
    font-size: 1.125rem;
    color: var(--text-color);
    margin-bottom: 0.5rem;
}

/* Portfolio Grid */
.portfolio-grid {
    padding: 3rem 0;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 2rem;
}

.portfolio-card {
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    padding: 2rem;
    transition: all 0.3s ease;
}

.portfolio-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.1);
}

.portfolio-card h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.portfolio-card h3 a {
    color: var(--text-color);
}

.project-meta {
    font-size: 0.875rem;
    color: var(--text-light);
    margin-bottom: 1rem;
}

.technologies {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin: 1rem 0;
}

.tech-tag {
    background-color: var(--bg-light);
    color: var(--primary-color);
    padding: 0.375rem 0.75rem;
    border-radius: 0.375rem;
    font-size: 0.875rem;
    font-weight: 500;
}

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

.read-more {
    color: var(--primary-color);
    font-weight: 600;
    display: inline-block;
    margin-top: 0.5rem;
}

/* Project Detail Pages */
.project-header {
    padding: 4rem 0 2rem;
    background-color: var(--bg-light);
}

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

.project-date {
    font-size: 1rem;
    color: var(--text-light);
    margin-bottom: 1rem;
}

.project-content {
    padding: 3rem 0;
}

.project-content h2 {
    font-size: 2rem;
    margin-top: 2.5rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.project-content h3 {
    font-size: 1.5rem;
    margin-top: 2rem;
    margin-bottom: 0.75rem;
}

.project-content p {
    font-size: 1.125rem;
    color: var(--text-light);
    margin-bottom: 1rem;
    line-height: 1.8;
}

.project-content ul {
    margin-left: 2rem;
    margin-bottom: 1.5rem;
}

.project-content li {
    font-size: 1.125rem;
    color: var(--text-light);
    margin-bottom: 0.75rem;
    line-height: 1.8;
}

.project-footer {
    padding: 2rem 0 3rem;
}

.back-link {
    display: inline-block;
    color: var(--primary-color);
    font-weight: 600;
    padding: 0.75rem 1.5rem;
    border: 2px solid var(--primary-color);
    border-radius: 0.5rem;
    transition: all 0.3s ease;
}

.back-link:hover {
    background-color: var(--primary-color);
    color: white;
}

/* Footer */
footer {
    background-color: var(--bg-light);
    border-top: 1px solid var(--border-color);
    padding: 1rem 0;
    margin-top: 2rem;
    text-align: center;
}

footer p {
    color: var(--text-light);
    font-size: 0.875rem;
}

footer a {
    color: var(--primary-color);
    font-weight: 500;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }

    .subtitle {
        font-size: 1.125rem;
    }

    .page-header .subtitle {
        font-size: 1.125rem;
    }

    .nav-menu {
        gap: 1rem;
    }

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

    .page-header h1,
    .project-header h1 {
        font-size: 1.5rem;
    }

    .container {
        padding: 0 1rem;
    }
}