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

:root {
    --color-bg: #fafafa;
    --color-text: #1a1a1a;
    --color-text-muted: #666;
    --color-primary: #2563eb;
    --color-primary-hover: #1d4ed8;
    --color-border: #e5e5e5;
    --color-card-bg: #ffffff;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --max-width: 1200px;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 2rem;
    --spacing-xl: 4rem;
    --transition: 0.2s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    font-size: 16px;
}

/* Typography */
h1, h2, h3, h4 {
    line-height: 1.2;
    font-weight: 600;
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(1.75rem, 3vw, 2.5rem); }
h3 { font-size: 1.25rem; }

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

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

/* Layout */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.section {
    padding: var(--spacing-xl) 0;
}

.section-title {
    margin-bottom: var(--spacing-xl);
    text-align: center;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: var(--color-primary);
    margin: var(--spacing-md) auto 0;
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(250, 250, 250, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid var(--color-border);
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--color-text);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
}

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

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

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.mobile-menu-btn span {
    width: 25px;
    height: 2px;
    background: var(--color-text);
    transition: var(--transition);
}

/* Hero */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--spacing-xl) var(--spacing-lg);
    padding-top: calc(var(--spacing-xl) + 60px);
}

.hero-greeting {
    font-size: 1.125rem;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-sm);
}

.hero-name {
    margin-bottom: var(--spacing-md);
}

.hero-tagline {
    font-size: 1.25rem;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-xl);
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.875rem 1.75rem;
    border-radius: 6px;
    font-weight: 500;
    text-align: center;
    transition: all var(--transition);
    cursor: pointer;
    border: none;
    font-size: 1rem;
}

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

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

.btn-secondary {
    background: transparent;
    color: var(--color-text);
    border: 1px solid var(--color-border);
}

.btn-secondary:hover {
    border-color: var(--color-text);
}

/* About Section */
.about {
    background: var(--color-card-bg);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-xl);
    align-items: center;
}

.about-image {
    aspect-ratio: 1;
    max-width: 300px;
    margin: 0 auto;
}

.about-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 8px;
}

.image-placeholder {
    width: 100%;
    height: 100%;
    min-height: 200px;
    background: var(--color-border);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

.about-text p {
    margin-bottom: var(--spacing-md);
    color: var(--color-text-muted);
}

.about-text p:last-child {
    margin-bottom: 0;
}

/* Skills Section */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
}

.skill-category {
    background: var(--color-card-bg);
    padding: var(--spacing-lg);
    border-radius: 8px;
    border: 1px solid var(--color-border);
}

.skill-category h3 {
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

.skill-list {
    list-style: none;
}

.skill-list li {
    padding: var(--spacing-sm) 0;
    color: var(--color-text-muted);
    border-bottom: 1px solid var(--color-border);
}

.skill-list li:last-child {
    border-bottom: none;
}

/* Projects Section */
.projects {
    background: var(--color-card-bg);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-lg);
}

.project-card {
    background: var(--color-bg);
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid var(--color-border);
    transition: transform var(--transition), box-shadow var(--transition);
}

.project-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
}

.project-image {
    aspect-ratio: 16/10;
}

.project-image .image-placeholder {
    border-radius: 0;
}

.project-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.project-info {
    padding: var(--spacing-lg);
}

.project-info h3 {
    margin-bottom: var(--spacing-sm);
}

.project-info p {
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-md);
    font-size: 0.9375rem;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.tag {
    background: var(--color-card-bg);
    padding: 0.25rem 0.75rem;
    border-radius: 100px;
    font-size: 0.75rem;
    color: var(--color-text-muted);
    border: 1px solid var(--color-border);
}

.project-links {
    display: flex;
    gap: var(--spacing-md);
}

.project-link {
    font-size: 0.875rem;
    font-weight: 500;
}

/* Contact Section */
.contact-intro {
    text-align: center;
    color: var(--color-text-muted);
    max-width: 600px;
    margin: 0 auto var(--spacing-xl);
}

.contact-form {
    max-width: 500px;
    margin: 0 auto var(--spacing-xl);
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
    font-size: 0.875rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    font-family: inherit;
    font-size: 1rem;
    transition: border-color var(--transition);
    background: var(--color-card-bg);
}

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

.contact-form .btn {
    width: 100%;
}

.contact-links {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

.contact-link {
    color: var(--color-text-muted);
    font-weight: 500;
}

.contact-link:hover {
    color: var(--color-primary);
}

/* Footer */
.footer {
    padding: var(--spacing-lg) 0;
    text-align: center;
    border-top: 1px solid var(--color-border);
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 60px;
        left: 0;
        right: 0;
        background: var(--color-bg);
        flex-direction: column;
        align-items: center;
        padding: var(--spacing-lg);
        gap: var(--spacing-md);
        border-bottom: 1px solid var(--color-border);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition);
    }

    .nav-links.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .mobile-menu-btn.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

    .mobile-menu-btn.active span:nth-child(2) {
        opacity: 0;
    }

    .mobile-menu-btn.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }

    .about-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

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

    .contact-links {
        flex-direction: column;
        align-items: center;
        gap: var(--spacing-md);
    }
}

@media (max-width: 480px) {
    .section {
        padding: var(--spacing-lg) 0;
    }

    .container {
        padding: 0 var(--spacing-md);
    }

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