/* Variables */
:root {
    --primary-color: #4a6cf7;
    --secondary-color: #6c757d;
    --background-color: #f8f9fa;
    --text-color: #333;
    --light-gray: #e9ecef;
    --dark-gray: #343a40;
    --white: #ffffff;
    --box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
    --border-radius: 8px;
    --hero-bg-image: url('../images/hero-bg-light.svg');
}

/* Dark theme variables */
[data-theme="dark"] {
    --primary-color: #60a5fa;
    --secondary-color: #94a3b8;
    --background-color: #0f172a;
    --text-color: #f1f5f9;
    --white: #1e293b;
    --light-gray: #334155;
    --dark-gray: #475569;
    --border-color: #475569;
    --hero-bg-image: url('../images/hero-bg-dark.svg');
}

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

body {
    font-family: 'Inter', 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header & Navigation */
header {
    background-color: var(--white);
    box-shadow: var(--box-shadow);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
}

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

.nav-links {
    display: flex;
    gap: 30px;
}

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

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

.theme-toggle {
    background: none;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    font-size: 16px;
}

.theme-toggle:hover {
    background-color: var(--primary-color);
    color: var(--white);
    transform: scale(1.1);
}

.burger {
    display: none;
    cursor: pointer;
}

.burger div {
    width: 25px;
    height: 3px;
    background-color: var(--text-color);
    margin: 5px;
    transition: var(--transition);
}

/* Hero Section */
.hero {
    height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 80px;
    background-image: var(--hero-bg-image);
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    position: relative;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    /* background: linear-gradient(135deg, var(--white) 0%, transparent 100%);*/
    z-index: 1;
}

.hero .container {
    position: relative;
    z-index: 2;
}

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

.hero h1 {
    font-size: 3rem;
    margin-bottom: 20px;
    line-height: 1.2;
}

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

.hero p {
    font-size: 1.2rem;
    margin-bottom: 30px;
    color: var(--secondary-color);
}

.cta-buttons {
    display: flex;
    gap: 15px;
}

.btn {
    padding: 12px 24px;
    border-radius: var(--border-radius);
    font-weight: 500;
    transition: var(--transition);
    display: inline-block;
    cursor: pointer;
    border: none;
}

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

.primary:hover {
    background-color: #3a5bd9;
    transform: translateY(-3px);
}

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

.secondary:hover {
    background-color: rgba(74, 108, 247, 0.1);
    transform: translateY(-3px);
}

[data-theme="dark"] .btn.secondary {
    color: var(--primary-color);
    border-color: var(--primary-color);
}

[data-theme="dark"] .btn.secondary:hover {
    background-color: var(--primary-color);
    color: var(--background-color);
}

/* Projects Section */
.projects {
    padding: 100px 0;
    background-color: var(--background-color);
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 50px;
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 50px;
    height: 3px;
    background-color: var(--primary-color);
}

.filter-container {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 40px;
}

.filter-btn {
    background-color: transparent;
    border: 2px solid var(--light-gray);
    color: var(--text-color);
    padding: 10px 20px;
    border-radius: 30px;
    cursor: pointer;
    transition: all 0.3s;
    font-size: 0.9rem;
}

.filter-btn:hover,
.filter-btn.active {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    color: var(--white);
}

[data-theme="dark"] .filter-btn {
    border-color: var(--border-color);
    color: var(--text-color);
}

[data-theme="dark"] .filter-btn:hover,
[data-theme="dark"] .filter-btn.active {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    color: var(--background-color);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 30px;
}

.project-card {
    background-color: var(--white);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    height: 100%;
}

.project-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
}

.project-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    position: relative;
}

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

.project-tags {
    position: absolute;
    top: 10px;
    left: 10px;
    display: flex;
    gap: 5px;
}

.project-tag {
    padding: 5px 10px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--white);
}

.tag-automatisation {
    background-color: #4a6cf7;
}

.tag-python {
    background-color: #3776ab;
}

.tag-nbn {
    background-color: #8a2be2;
}

.tag-power-bi {
    background-color: #f2c811;
    color: var(--dark-gray);
}

.project-content {
    padding: 20px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.project-title {
    font-size: 1.2rem;
    margin-bottom: 10px;
    font-weight: 600;
}

.project-description {
    color: var(--secondary-color);
    font-size: 0.9rem;
    margin-bottom: 15px;
}

.project-content a.btn {
    margin-top: auto; 
    align-self: flex-start;
}

/* About Section */
.about {
    padding: 100px 0;
    background-color: var(--white);
}

.about-content {
    display: flex;
    align-items: center;
    gap: 50px;
}

.about-text {
    flex: 1;
}

.about-text p {
    margin-bottom: 20px;
}

.skills {
    margin-top: 30px;
}

.skills h3 {
    margin-bottom: 25px;
    font-size: 1.3rem;
}

.skill-category {
    margin-bottom: 25px;
}

.skill-category h4 {
    margin-bottom: 10px;
    font-size: 1.1rem;
    color: var(--primary-color);
    font-weight: 600;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.skill-tag {
    background-color: var(--light-gray);
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 0.9rem;
    transition: all 0.3s;
}

.skill-tag:hover {
    background-color: var(--primary-color);
    color: var(--white);
    transform: translateY(-2px);
}

[data-theme="dark"] .skill-tag {
    background-color: var(--border-color);
    color: var(--text-color);
}

[data-theme="dark"] .skill-tag:hover {
    background-color: var(--primary-color);
    color: var(--background-color);
}

/* Contact Section */
.contact {
    padding: 100px 0;
    background-color: var(--background-color);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 50px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.centered-contact {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 40px;
    flex-wrap: wrap;
}

.centered-contact .contact-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px;
    transition: all 0.3s ease;
    background: transparent;
}

.centered-contact .contact-item:hover {
    transform: translateY(-2px);
}

.centered-contact .contact-item:hover a {
    color: var(--primary-color);
}

.centered-contact .contact-item:hover i {
    color: var(--primary-color);
}

.centered-contact .contact-item a {
    text-decoration: none;
    color: inherit;
    font-weight: 500;
}

.centered-contact .contact-item i {
    font-size: 1.2rem;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 15px;
}

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

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.form-group label {
    font-weight: 500;
}

.form-group input, .form-group textarea {
    padding: 12px;
    border-radius: var(--border-radius);
    border: 1px solid var(--light-gray);
    font-family: inherit;
    transition: var(--transition);
}

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

/* Project Detail Pages */
.project-page {
    margin-top: 80px;
    min-height: calc(100vh - 160px);
}

.project-detail {
    max-width: 900px;
    margin: 0 auto;
    padding: 40px 20px;
}

.project-header {
    margin-bottom: 50px;
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    margin-bottom: 30px;
    transition: all 0.3s;
    font-size: 0.95rem;
}

.back-link:hover {
    color: var(--primary-color);
    transform: translateX(-5px);
}

.project-header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: 20px;
    line-height: 1.2;
}

.project-meta {
    display: flex;
    align-items: center;
    gap: 20px;
    flex-wrap: wrap;
    margin-bottom: 30px;
}

.project-date {
    color: var(--secondary-color);
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: 5px;
}

.project-date::before {
    content: '📅';
    font-size: 0.9rem;
}

.project-categories {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.project-categories .filter-btn,
.project-category-tag {
    background-color: transparent;
    border: 2px solid var(--light-gray);
    color: var(--text-color);
    padding: 10px 20px;
    border-radius: 30px;
    font-size: 0.9rem;
    text-decoration: none;
    transition: all 0.3s;
    display: inline-block;
}

.project-categories .filter-btn:hover,
.project-category-tag:hover {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    color: var(--white);
}

[data-theme="dark"] .project-categories .filter-btn,
[data-theme="dark"] .project-category-tag {
    border-color: var(--border-color);
    color: var(--text-color);
}

[data-theme="dark"] .project-categories .filter-btn:hover,
[data-theme="dark"] .project-category-tag:hover {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    color: var(--background-color);
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
    margin-bottom: 30px;
}

.project-tag {
    background: var(--primary-color);
    color: var(--white);
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 500;
    text-decoration: none;
    transition: var(--transition);
}

.project-tag:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(74, 108, 247, 0.3);
}

.project-featured-image {
    width: 100%;
    max-width: 800px;
    margin: 0 auto 40px;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--box-shadow);
}

.project-featured-image img {
    width: 100%;
    height: auto;
    display: block;
}

.project-content {
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.8;
    font-size: 1.1rem;
    color: var(--text-color);
}

.project-content h1,
.project-content h2,
.project-content h3,
.project-content h4,
.project-content h5,
.project-content h6 {
    color: var(--text-color);
    margin-top: 2.5rem;
    margin-bottom: 1rem;
    line-height: 1.3;
}

.project-content h1:first-child,
.project-content h2:first-child,
.project-content h3:first-child {
    margin-top: 0;
}

.project-content h2 {
    font-size: 1.8rem;
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 8px;
    margin-bottom: 1.5rem;
}

.project-content h3 {
    font-size: 1.5rem;
    color: var(--primary-color);
}

.project-content p {
    margin-bottom: 1.2rem;
}

.project-page .project-detail .project-content a {
    color: var(--primary-color);
    text-decoration: underline;
}

.project-page .project-detail .project-content a:hover {
    color: var(--text-color);
    text-decoration: underline;
}

.project-content ul,
.project-content ol {
    margin: 1.5rem 0;
    padding-left: 0;
    list-style: none;
}

.project-content ul li {
    position: relative;
    margin-bottom: 0.8rem;
    padding-left: 2rem;
    line-height: 1.6;
}

.project-content ul li::before {
    content: '▶';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-size: 0.9rem;
    top: 0.1rem;
}

.project-content ol {
    counter-reset: item;
    padding-left: 0;
}

.project-content ol li {
    position: relative;
    margin-bottom: 0.8rem;
    padding-left: 2.5rem;
    line-height: 1.6;
    counter-increment: item;
}

.project-content ol li::before {
    content: counter(item) '.';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: 600;
    min-width: 2rem;
}

.project-content ul ul,
.project-content ol ol {
    margin: 0.5rem 0;
    padding-left: 1.5rem;
}

.project-content ul ul li::before {
    content: '◦';
    font-size: 0.8rem;
}

.project-content ol ul li::before {
    content: '◦';
    font-size: 0.8rem;
}

.project-content img {
    max-width: 100%;
    height: auto;
    border-radius: 10px;
    margin: 30px 0;
    box-shadow: 0 8px 25px rgba(0,0,0,0.1);
    display: block;
}

.project-content pre {
    background: var(--light-gray);
    color: var(--text-color);
    padding: 20px;
    border-radius: var(--border-radius);
    overflow-x: auto;
    margin: 25px 0;
    border-left: 4px solid var(--primary-color);
    font-size: 0.95rem;
}

.project-content code {
    background: var(--light-gray);
    color: var(--primary-color);
    padding: 3px 8px;
    border-radius: 4px;
    font-family: 'Monaco', 'Consolas', monospace;
    font-size: 0.9em;
}

.project-content pre code {
    background: none;
    padding: 0;
    color: inherit;
}

.project-content blockquote {
    border-left: 4px solid var(--primary-color);
    padding: 20px 25px;
    margin: 25px 0;
    background: var(--light-gray);
    border-radius: var(--border-radius);
    font-style: italic;
    position: relative;
}

.project-content blockquote::before {
    content: '💡';
    position: absolute;
    top: 15px;
    left: -2px;
    font-size: 1.2rem;
}

.project-navigation {
    margin-top: 50px;
    padding-top: 30px;
    text-align: center;
    border-top: 2px solid var(--border-color);
}

.project-navigation .btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    border: 2px solid var(--primary-color);
    background: transparent;
    color: var(--primary-color);
}

.project-navigation .btn:hover {
    background: var(--primary-color);
    color: var(--background-color);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

.related-projects {
    margin: 60px 0 40px;
    padding-top: 40px;
    border-top: 1px solid var(--light-gray);
}

.related-projects h2 {
    text-align: center;
    margin-bottom: 30px;
    color: var(--text-color);
}

.related-projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
}

.project-navigation {
    text-align: center;
    margin-top: 40px;
    padding-top: 30px;
    border-top: 1px solid var(--light-gray);
}

.btn-secondary {
    background: var(--light-gray);
    color: var(--text-color);
    border: 2px solid var(--light-gray);
}

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

@media (max-width: 768px) {
    .project-page {
        margin-top: 70px;
    }
    
    .project-detail {
        padding: 20px 15px;
    }
    
    .project-header h1 {
        font-size: 2rem;
    }
    
    .project-content {
        font-size: 1rem;
    }
    
    .project-meta {
        flex-direction: column;
        align-items: flex-start;
        gap: 15px;
    }
    
    .project-content h2 {
        font-size: 1.5rem;
    }
    
    .project-content h3 {
        font-size: 1.3rem;
    }
    
    .project-tags {
        justify-content: center;
    }
    
    .related-projects-grid {
        grid-template-columns: 1fr;
    }
    
    .project-content {
        padding: 0 20px;
    }
}

@media screen and (max-width: 768px) {
    .project-title {
        font-size: 2rem;
    }
    
    .project-tags {
        justify-content: center;
    }
    
    .related-projects-grid {
        grid-template-columns: 1fr;
    }
    
    .project-content {
        padding: 0 20px;
    }
}

[data-theme="dark"] .project-content pre {
    background-color: #2d3748;
    border-left-color: var(--primary-color);
}

[data-theme="dark"] .project-content code {
    background-color: #2d3748;
    color: var(--primary-color);
}

[data-theme="dark"] .project-content blockquote {
    background-color: #2d3748;
    border-left-color: var(--primary-color);
}

/* Footer */
footer {
    background-color: var(--dark-gray);
    color: var(--white);
    padding: 30px 0;
    text-align: center;
}

[data-theme="dark"] footer {
    background-color: #1e293b;
    color: var(--text-color);
}

/* Responsive Design */
@media screen and (max-width: 768px) {
    .nav-links {
        position: absolute;
        right: 0;
        height: 92vh;
        top: 8vh;
        background-color: var(--white);
        display: flex;
        flex-direction: column;
        align-items: center;
        width: 50%;
        transform: translateX(100%);
        transition: transform 0.5s ease-in;
        box-shadow: -5px 0 10px rgba(0, 0, 0, 0.1);
        padding-top: 50px;
    }
    
    .nav-links li {
        opacity: 0;
    }
    
    .burger {
        display: block;
    }
    
    .nav-active {
        transform: translateX(0%);
    }
    
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .hero .btn {
        text-align: center;
    }
    
    .about-content, .contact-content {
        grid-template-columns: 1fr;
    }

    .project-card {
        padding: 15px;
        margin-bottom: 20px;
    }
    
    .project-content {
        padding: 15px;
    }
}

@keyframes navLinkFade {
    from {
        opacity: 0;
        transform: translateX(50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.toggle .line1 {
    transform: rotate(-45deg) translate(-5px, 6px);
}

.toggle .line2 {
    opacity: 0;
}

.toggle .line3 {
    transform: rotate(45deg) translate(-5px, -6px);
}