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

:root {
    --primary-color: #5B9BD5;
    --primary-dark: #4A8BC2;
    --primary-light: #E8F2FA;
    --text-dark: #2C3E50;
    --text-light: #5A6C7D;
    --white: #FFFFFF;
    --gray-light: #F8F9FA;
    --shadow: rgba(91, 155, 213, 0.1);
    --bg-color: #FFFFFF;
    --bg-secondary: #F8F9FA;
    --card-bg: #FFFFFF;
}

/* Dark Mode Colors */
[data-theme="dark"] {
    --primary-color: #6DB3F2;
    --primary-dark: #5B9BD5;
    --primary-light: #1E3A5F;
    --text-dark: #E8E8E8;
    --text-light: #B0B0B0;
    --white: #E8E8E8;
    --gray-light: #1A1A1A;
    --shadow: rgba(0, 0, 0, 0.3);
    --bg-color: #121212;
    --bg-secondary: #1A1A1A;
    --card-bg: #1E1E1E;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-dark);
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
}

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

/* Navigation */
.navbar {
    background-color: var(--card-bg);
    padding: 1rem 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px var(--shadow);
    transition: background-color 0.3s ease;
}

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

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

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

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

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

.nav-right {
    display: flex;
    align-items: center;
    gap: 1rem;
}

/* Theme Toggle Button */
.theme-toggle {
    background-color: transparent;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    transition: all 0.3s ease;
}

.theme-toggle:hover {
    background-color: var(--primary-color);
    color: var(--white);
    transform: rotate(20deg);
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 4px;
    cursor: pointer;
}

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

/* Hero Section */
.hero {
    padding: 150px 0 100px;
    text-align: center;
    background: linear-gradient(135deg, var(--bg-color) 0%, var(--primary-light) 100%);
    transition: background 0.3s ease;
}

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

.hero-title {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.highlight {
    color: var(--primary-color);
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--text-light);
    margin-bottom: 1rem;
}

.hero-description {
    font-size: 1.1rem;
    color: var(--text-light);
    margin-bottom: 2rem;
}

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

.btn {
    padding: 12px 30px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    display: inline-block;
}

.btn-primary {
    background-color: var(--primary-color);
    color: var(--bg-color);
    border: 2px solid var(--primary-color);
}

.btn-primary:hover {
    background-color: var(--primary-dark);
    border-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow);
}

.btn-secondary {
    background-color: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

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

/* About Section */
.about {
    padding: 80px 0;
    background-color: var(--bg-color);
    transition: background-color 0.3s ease;
}

.section-title {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 3rem;
    color: var(--text-dark);
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background-color: var(--primary-color);
    margin: 1rem auto 0;
    border-radius: 2px;
}

.about-content {
    max-width: 1000px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: 3rem;
    flex-wrap: wrap;
    justify-content: center;
}

.about-image {
    flex: 0 0 auto;
}

.profile-photo {
    width: 250px;
    height: 250px;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid var(--primary-color);
    box-shadow: 0 4px 20px var(--shadow);
    transition: transform 0.3s ease;
}

.profile-photo:hover {
    transform: scale(1.05);
}

.about-text {
    flex: 1;
    min-width: 300px;
    max-width: 600px;
}

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

.skills {
    margin-top: 3rem;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    max-width: 1000px;
    margin-left: auto;
    margin-right: auto;
}

.skills-category h4 {
    font-size: 1.2rem;
    margin-bottom: 1rem;
    color: var(--text-dark);
    font-weight: 600;
}

.skills h3 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--text-dark);
}

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

.skill-tag {
    background-color: var(--primary-light);
    color: var(--primary-color);
    padding: 8px 20px;
    border-radius: 20px;
    font-weight: 500;
    font-size: 0.95rem;
    transition: background-color 0.3s ease;
}

/* Projects Section */
.projects {
    padding: 80px 0;
    background-color: var(--bg-secondary);
    transition: background-color 0.3s ease;
}

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

.view-more-container {
    text-align: center;
    margin-top: 2.5rem;
}

.btn-view-more {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 12px 30px;
    background-color: var(--primary-color);
    color: var(--bg-color);
    text-decoration: none;
    border-radius: 8px;
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.3s ease;
    box-shadow: 0 2px 10px var(--shadow);
}

.btn-view-more:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px var(--shadow);
}

.btn-view-more i {
    transition: transform 0.3s ease;
}

.btn-view-more:hover i {
    transform: translateX(5px);
}

.category-title {
    font-size: 2rem;
    color: var(--text-dark);
    margin-bottom: 2rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.category-title i {
    color: var(--primary-color);
    font-size: 2.2rem;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2.5rem;
}

@media (max-width: 968px) {
    .projects-grid {
        grid-template-columns: 1fr;
    }
}

.project-card {
    background-color: var(--card-bg);
    border-radius: 12px;
    overflow: hidden;
    transition: all 0.3s ease;
    box-shadow: 0 2px 10px var(--shadow);
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px var(--shadow);
}

.project-image {
    position: relative;
    width: 100%;
    height: 0;
    padding-bottom: 50%; /* 2:1 aspect ratio (1/2 = 0.5 = 50%) */
    overflow: hidden;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
}

.project-image img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: contain;
    object-position: center;
    background-color: var(--bg-secondary);
    transition: transform 0.3s ease;
}

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

.project-overlay {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 4rem;
    color: rgba(255, 255, 255, 0.3);
    pointer-events: none;
}

.project-content {
    padding: 1.5rem;
}

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.project-icon {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.project-title {
    font-size: 1.5rem;
    color: var(--text-dark);
    flex: 1;
    margin: 0;
}

.role-badge {
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    white-space: nowrap;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.badge-scratch {
    background: linear-gradient(135deg, #28a745, #20c997);
    color: white;
}

.badge-maintenance {
    background: linear-gradient(135deg, #ffc107, #ff9800);
    color: white;
}

.badge-team {
    background: linear-gradient(135deg, #6f42c1, #e83e8c);
    color: white;
}

.badge-feature {
    background: linear-gradient(135deg, #17a2b8, #007bff);
    color: white;
}

.project-affiliation {
    color: var(--text-light);
    font-size: 0.85rem;
    font-style: italic;
    margin-bottom: 0.75rem;
    margin-top: 0.5rem;
    opacity: 0.8;
}

.project-description {
    color: var(--text-light);
    margin-bottom: 1rem;
    line-height: 1.6;
    font-size: 0.95rem;
}

.contribution {
    background-color: var(--primary-light);
    padding: 0.75rem 1rem;
    border-radius: 8px;
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
    line-height: 1.5;
    color: var(--text-light);
    border-left: 3px solid var(--primary-color);
}

.contribution strong {
    color: var(--text-dark);
    display: block;
    margin-bottom: 0.25rem;
}

.tech-stack {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--primary-light);
}

.tech-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-light);
    font-size: 0.9rem;
}

.tech-item i {
    color: var(--primary-color);
    font-size: 1.2rem;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.tag {
    background-color: var(--primary-light);
    color: var(--primary-color);
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 0.85rem;
    font-weight: 500;
    transition: background-color 0.3s ease;
}

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

.project-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease;
}

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

.project-link i {
    margin-right: 5px;
}

/* Contact Section */
.contact {
    padding: 80px 0;
    background-color: var(--bg-color);
    transition: background-color 0.3s ease;
}

.contact-subtitle {
    text-align: center;
    color: var(--text-light);
    font-size: 1.1rem;
    margin-bottom: 3rem;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    max-width: 1000px;
    margin: 0 auto;
}

.contact-info-centered {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    align-items: center;
    max-width: 600px;
    margin: 0 auto;
}

.contact-item {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
}

.contact-item i {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-top: 5px;
}

.contact-item h3 {
    color: var(--text-dark);
    margin-bottom: 0.5rem;
}

.contact-item p {
    color: var(--text-light);
}

.contact-link {
    color: var(--text-light);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

/* Footer */
.footer {
    background-color: var(--card-bg);
    color: var(--text-dark);
    padding: 2rem 0;
    text-align: center;
    transition: background-color 0.3s ease;
    border-top: 1px solid var(--primary-light);
}

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

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

.social-links a {
    color: var(--text-dark);
    font-size: 1.5rem;
    transition: color 0.3s ease;
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: var(--card-bg);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: 0 10px 27px var(--shadow);
        padding: 2rem 0;
    }

    .nav-menu.active {
        left: 0;
    }

    .hamburger {
        display: flex;
    }

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

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

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

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

    .footer .container {
        flex-direction: column;
        gap: 1rem;
    }

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

    .skills {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 120px 0 80px;
    }

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

    .btn {
        width: 100%;
        max-width: 250px;
    }
}