:root {
    --color-primary: #1e3a8a;
    --color-secondary: #06b6d4;
    --color-accent: #f59e0b;
    --color-dark: #0f172a;
    --color-light: #f8fafc;
    --color-border: #e2e8f0;
    --color-text: #1e293b;
    --color-text-muted: #64748b;
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-error: #ef4444;
    
    --font-sans: 'Inter', sans-serif;
    --font-heading: 'Poppins', sans-serif;
    
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    color: var(--color-text);
    background-color: #fff;
    line-height: 1.6;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
}

h1 { font-size: 3rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

p {
    margin-bottom: 1rem;
    color: var(--color-text);
}

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

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

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Navigation */
.navbar {
    background-color: #fff;
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: var(--transition);
}

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

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

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

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

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

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

.menu-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--color-primary);
    border-radius: 2px;
    transition: var(--transition);
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--color-primary) 0%, #1e3a8a 100%);
    color: #fff;
    padding: 100px 0;
    text-align: center;
}

.hero-content {
    animation: slideUp 0.6s ease-out;
}

.hero-title {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    opacity: 0.9;
}

.hero-description {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    opacity: 0.8;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

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

/* Buttons */
.btn {
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    font-weight: 600;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    display: inline-block;
    text-align: center;
    font-size: 1rem;
}

.btn-primary {
    background-color: var(--color-secondary);
    color: #fff;
}

.btn-primary:hover {
    background-color: #0891b2;
    transform: translateY(-2px);
}

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

.btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

/* Projects Preview Section */
.projects-preview {
    padding: 80px 0;
    background-color: var(--color-light);
}

.projects-preview h2 {
    text-align: center;
    margin-bottom: 3rem;
}

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

.project-card {
    background: #fff;
    border-radius: 0.75rem;
    overflow: hidden;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: var(--transition);
    cursor: pointer;
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.15);
}

.project-image {
    height: 200px;
    background-size: cover;
    background-position: center;
    transition: var(--transition);
}

.project-card:hover .project-image {
    transform: scale(1.05);
}

.project-info {
    padding: 1.5rem;
}

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

.project-info p {
    color: var(--color-text-muted);
    font-size: 0.95rem;
    margin-bottom: 1rem;
}

/* Tech Tags */
.tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tag {
    display: inline-block;
    background-color: #e0f2fe;
    color: var(--color-primary);
    padding: 0.25rem 0.75rem;
    border-radius: 2rem;
    font-size: 0.8rem;
    font-weight: 500;
}

/* About Preview Section */
.about-preview {
    padding: 80px 0;
    background-color: #fff;
}

.about-content h2 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
}

.about-content p {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--color-text-muted);
    margin-bottom: 1.5rem;
}

.link-arrow {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    color: var(--color-primary);
}

.link-arrow:hover {
    gap: 1rem;
}

/* Page Header */
.page-header {
    background: linear-gradient(135deg, var(--color-primary) 0%, #1e3a8a 100%);
    color: #fff;
    padding: 60px 0;
    text-align: center;
}

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

.page-header p {
    font-size: 1.1rem;
    opacity: 0.9;
}

/* About Section */
.about-section {
    padding: 80px 0;
}

.about-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 3rem;
    align-items: start;
}

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

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

.skills-list {
    list-style: none;
    margin: 1rem 0 2rem 0;
}

.skills-list li {
    padding: 0.5rem 0 0.5rem 1.5rem;
    position: relative;
}

.skills-list li:before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--color-secondary);
}

.about-sidebar {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.professional-photo {
    width: 100%;
    aspect-ratio: 1;
    background-color: var(--color-light);
    border-radius: 0.75rem;
    overflow: hidden;
}

.professional-photo svg {
    width: 100%;
    height: 100%;
}

.info-box {
    background-color: var(--color-light);
    padding: 1.5rem;
    border-radius: 0.75rem;
}

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

.info-box p {
    margin-bottom: 0.5rem;
}

.text-muted {
    color: var(--color-text-muted) !important;
}

/* Projects Section */
.projects-section {
    padding: 80px 0;
}

.projects-full-grid {
    display: flex;
    flex-direction: column;
    gap: 3rem;
}

.project-full {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    align-items: center;
}

.project-full:nth-child(even) {
    direction: rtl;
}

.project-full-image {
    height: 300px;
    background-size: cover;
    background-position: center;
    border-radius: 0.75rem;
    overflow: hidden;
    direction: ltr;
}

.project-full-content {
    direction: ltr;
}

.project-full-content h3 {
    color: var(--color-primary);
    margin-bottom: 1rem;
}

.project-full-content p {
    color: var(--color-text-muted);
    margin-bottom: 1rem;
    line-height: 1.8;
}

.project-meta {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.date {
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

/* Skills Section */
.skills-section {
    padding: 80px 0;
}

.skills-category {
    margin-bottom: 4rem;
}

.skills-category h2 {
    color: var(--color-primary);
    margin-bottom: 2rem;
}

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

.skill-item {
    background-color: var(--color-light);
    padding: 1.5rem;
    border-radius: 0.75rem;
}

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

.skill-name {
    font-weight: 600;
    color: var(--color-primary);
}

.skill-level {
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

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

.skill-progress {
    height: 100%;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    border-radius: 4px;
    animation: growWidth 1s ease-out;
}

@keyframes growWidth {
    from { width: 0 !important; }
}

.tools-list {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}

.tool-badge {
    background-color: var(--color-primary);
    color: #fff;
    padding: 0.5rem 1rem;
    border-radius: 2rem;
    font-weight: 500;
    font-size: 0.9rem;
}

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

.certification-item {
    background-color: var(--color-light);
    padding: 1.5rem;
    border-radius: 0.75rem;
    border-left: 4px solid var(--color-secondary);
}

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

/* Contact Section */
.contact-section {
    padding: 80px 0;
}

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

.contact-form-wrapper h2 {
    color: var(--color-primary);
    margin-bottom: 2rem;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

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

.form-group label {
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--color-primary);
}

.form-group input,
.form-group textarea {
    padding: 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: 0.5rem;
    font-family: var(--font-sans);
    font-size: 1rem;
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(30, 58, 138, 0.1);
}

.contact-info h2 {
    color: var(--color-primary);
    margin-bottom: 2rem;
}

.contact-item {
    margin-bottom: 2rem;
}

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

.contact-item p {
    color: var(--color-text-muted);
    margin-bottom: 0.5rem;
}

.contact-item a {
    color: var(--color-primary);
    font-weight: 500;
}

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

.social-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background-color: var(--color-light);
    border-radius: 50%;
    color: var(--color-primary);
    transition: var(--transition);
}

.social-link:hover {
    background-color: var(--color-primary);
    color: #fff;
    transform: translateY(-2px);
}

.availability-box {
    background: linear-gradient(135deg, var(--color-primary) 0%, #1e3a8a 100%);
    color: #fff;
    padding: 1.5rem;
    border-radius: 0.75rem;
    margin-top: 1rem;
}

.availability-box h4 {
    margin-bottom: 0.5rem;
}

/* Footer */
.footer {
    background-color: var(--color-dark);
    color: #fff;
    padding: 60px 0 20px 0;
}

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

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

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

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

.footer-section a {
    color: #cbd5e1;
    transition: var(--transition);
}

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

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 2rem;
    text-align: center;
    color: #cbd5e1;
}

/* Animations */
@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 1rem;
    }

    h1 { font-size: 2rem; }
    h2 { font-size: 1.5rem; }
    h3 { font-size: 1.25rem; }

    .menu-toggle {
        display: flex;
    }

    .nav-links {
        position: absolute;
        top: 60px;
        left: 0;
        right: 0;
        flex-direction: column;
        background-color: #fff;
        gap: 0;
        display: none;
        box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    }

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

    .nav-links li {
        padding: 1rem;
        border-bottom: 1px solid var(--color-border);
    }

    .nav-links li:last-child {
        border-bottom: none;
    }

    .hero {
        padding: 60px 0;
    }

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

    .hero-subtitle {
        font-size: 1.2rem;
    }

    .hero-buttons {
        flex-direction: column;
    }

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

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

    .project-full:nth-child(even) {
        direction: ltr;
    }

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

    .page-header h1 {
        font-size: 2rem;
    }

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

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

    .projects-preview,
    .about-preview {
        padding: 40px 0;
    }
}

@media (max-width: 480px) {
    h1 { font-size: 1.5rem; }
    h2 { font-size: 1.25rem; }

    .hero-title {
        font-size: 1.5rem;
    }

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

    .btn {
        padding: 0.6rem 1.2rem;
        font-size: 0.9rem;
    }

    .projects-grid,
    .tools-list {
        gap: 1rem;
    }
}