/* ===================================
   CSS Variables & Reset
   =================================== */
:root {
    --primary-color: #00ff88;
    --secondary-color: #0077ff;
    --accent-color: #ff0055;
    --bg-dark: #0a0e27;
    --bg-darker: #060a1f;
    --bg-card: #141937;
    --text-primary: #ffffff;
    --text-secondary: #a0aec0;
    --text-muted: #64748b;
    --border-color: #1e293b;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

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

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

/* ===================================
   Navigation
   =================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(10, 14, 39, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 20px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.5rem;
    font-weight: bold;
}

.brand-title {
    color: var(--text-primary);
}

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

.nav-menu a {
    color: var(--text-secondary);
    transition: var(--transition);
    position: relative;
    padding: 0.5rem 0;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: var(--transition);
}

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

.nav-menu a:hover::after,
.nav-menu a.active::after {
    width: 100%;
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 5px;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    border-radius: 3px;
    transition: var(--transition);
}

/* ===================================
   Hero Section
   =================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding-top: 80px;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, var(--bg-darker) 0%, var(--bg-dark) 100%);
}

#matrix-canvas {
    width: 100%;
    height: 100%;
    opacity: 0.3;
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
}

.glitch {
    font-size: 4rem;
    font-weight: 900;
    margin-bottom: 1rem;
    position: relative;
    animation: glitch 3s infinite;
}

@keyframes glitch {
    0%, 98% {
        text-shadow: none;
    }
    99% {
        text-shadow: 
            2px 2px var(--primary-color),
            -2px -2px var(--accent-color);
    }
}

.subtitle {
    font-size: 1.5rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

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

.btn {
    padding: 1rem 2rem;
    border-radius: 8px;
    font-weight: 600;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--bg-dark);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(0, 255, 136, 0.3);
}

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

.btn-secondary:hover {
    background: var(--primary-color);
    color: var(--bg-dark);
}

.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    color: var(--primary-color);
    font-size: 2rem;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(10px); }
}

/* ===================================
   Overview Section
   =================================== */
.overview {
    padding: 6rem 0;
    background: var(--bg-dark);
}

.profile-section {
    display: flex;
    align-items: center;
    gap: 3rem;
    margin-bottom: 5rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 3rem;
}

.profile-image-container {
    flex-shrink: 0;
}

.profile-image {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid var(--primary-color);
    box-shadow: 0 0 30px rgba(0, 255, 136, 0.3);
}

.profile-text h2 {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.profile-text p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    line-height: 1.8;
}

/* ===================================
   Placeholder Text (TODO: ersetzen)
   =================================== */
.placeholder {
    background: rgba(255, 200, 0, 0.15);
    border: 2px dashed #ffc800;
    border-radius: 6px;
    padding: 0.2em 0.4em;
    color: #ffc800 !important;
    font-style: italic;
    position: relative;
    display: inline-block;
}

.placeholder::before {
    content: "✏ PLACEHOLDER: ";
    font-size: 0.75em;
    font-weight: bold;
    color: #ffc800;
    opacity: 0.8;
    font-style: normal;
}

.placeholder-block {
    background: rgba(255, 200, 0, 0.1);
    border: 2px dashed #ffc800;
    border-radius: 8px;
    padding: 1rem 1.5rem;
    color: #ffc800 !important;
    font-style: italic;
    position: relative;
}

.placeholder-block::before {
    content: "✏ PLACEHOLDER – bitte ersetzen";
    display: block;
    font-size: 0.75em;
    font-weight: bold;
    color: #ffc800;
    opacity: 0.8;
    font-style: normal;
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.overview-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.overview-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transform: scaleX(0);
    transition: var(--transition);
}

.overview-card:hover::before {
    transform: scaleX(1);
}

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

.overview-card h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.overview-card p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

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

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

/* ===================================
   Page Header
   =================================== */
.page-header {
    padding: 8rem 0 4rem 0;
    text-align: center;
    background: linear-gradient(135deg, var(--bg-darker) 0%, var(--bg-dark) 100%);
    border-bottom: 1px solid var(--border-color);
}

.page-header h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    display: inline-flex;
    align-items: center;
    gap: 1rem;
}

.page-header i {
    color: var(--primary-color);
}

.page-header p {
    font-size: 1.2rem;
    color: var(--text-secondary);
}

/* ===================================
   Projects Section
   =================================== */
.projects-section {
    padding: 4rem 0;
}

.filter-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 0.75rem 1.5rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    cursor: pointer;
    transition: var(--transition);
    font-weight: 600;
}

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

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

.project-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    display: block;
    text-decoration: none;
    color: inherit;
}

.project-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transform: scaleX(0);
    transition: var(--transition);
}

.project-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
    box-shadow: var(--shadow);
}

.project-card:hover::before {
    transform: scaleX(1);
}

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

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: 1.5rem;
}

.project-header h3 {
    font-size: 1.8rem;
    color: var(--text-primary);
}

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

.tag {
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
}

.tag-school {
    background: rgba(0, 119, 255, 0.2);
    color: var(--secondary-color);
    border: 1px solid var(--secondary-color);
}

.tag-private {
    background: rgba(0, 255, 136, 0.2);
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
}

.project-overlay {
    position: absolute;
    bottom: 1rem;
    right: 1rem;
    font-size: 2rem;
    color: var(--primary-color);
    opacity: 0;
    transition: var(--transition);
}

.project-card:hover .project-overlay {
    opacity: 1;
}

/* ===================================
   Skills Section
   =================================== */
.skills-section {
    padding: 4rem 0;
}

/* Breadcrumb for Project Details */
.breadcrumb {
    margin-bottom: 1.5rem;
}

.breadcrumb a {
    color: var(--text-secondary);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition);
    font-size: 1rem;
}

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

/* Project Detail Section */
.project-detail-section {
    padding: 4rem 0;
}

.project-detail-content {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 3rem;
    max-width: 900px;
    margin: 0 auto;
}

.project-detail-content h2 {
    color: var(--primary-color);
    font-size: 1.8rem;
    margin-top: 2rem;
    margin-bottom: 1rem;
}

.project-detail-content h2:first-child {
    margin-top: 0;
}

.project-detail-content p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 1.5rem;
}

.project-detail-content ul,
.project-detail-content ol {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 1.5rem;
    padding-left: 2rem;
}

.project-detail-content li {
    margin-bottom: 0.75rem;
}

.project-detail-content h3 {
    color: var(--text-primary);
    font-size: 1.4rem;
    margin-top: 1.5rem;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.project-detail-content code {
    background: var(--bg-darker);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    color: var(--primary-color);
    font-family: 'Courier New', monospace;
    font-size: 0.9em;
}

.skill-category {
    margin-bottom: 3rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
}

.category-title {
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}

.skill-tag {
    padding: 0.75rem 1.5rem;
    background: var(--bg-darker);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    transition: var(--transition);
    font-weight: 500;
}

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

/* ===================================
   Certificates Section
   =================================== */
.certificates-section {
    padding: 4rem 0;
}

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

.certificate-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    position: relative;
    transition: var(--transition);
    overflow: hidden;
}

.certificate-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transform: scaleX(0);
    transition: var(--transition);
}


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

.certificate-img {
    width: 80px;
    height: 80px;
    object-fit: contain;
}

.certificate-content h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.certificate-title {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

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

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

.certificate-badge {
    position: absolute;
    bottom: 1rem;
    right: 1rem;
    font-size: 3rem;
    color: var(--primary-color);
    opacity: 0.6;
}

/* ===================================
   Contact Section
   =================================== */
.contact-section {
    padding: 4rem 0;
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.contact-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    display: block;
}

.contact-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transform: scaleX(0);
    transition: var(--transition);
}

.contact-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
    box-shadow: var(--shadow);
}

.contact-card:hover::before {
    transform: scaleX(1);
}

.contact-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    width: 70px;
    height: 70px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.linkedin-icon {
    background: linear-gradient(135deg, #0077b5, #00a0dc);
}

.email-icon {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
}

.contact-content h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.contact-content p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

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

.contact-card:hover .contact-link-text {
    gap: 1rem;
}

.contact-info {
    margin-top: 3rem;
}

.info-box {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.info-box i {
    font-size: 2rem;
    color: var(--primary-color);
}

.info-box p {
    color: var(--text-secondary);
    margin: 0;
}

/* ===================================
   Footer
   =================================== */
.footer {
    background: var(--bg-darker);
    border-top: 1px solid var(--border-color);
    padding: 2rem 0;
    margin-top: 4rem;
}

.footer .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer p {
    color: var(--text-secondary);
}

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

.footer-links a {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    transition: var(--transition);
}

.footer-links a:hover {
    background: var(--primary-color);
    color: var(--bg-dark);
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background: var(--bg-darker);
        width: 100%;
        text-align: center;
        transition: var(--transition);
        padding: 2rem 0;
        border-top: 1px solid var(--border-color);
    }

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

    .glitch {
        font-size: 2.5rem;
    }

    .subtitle {
        font-size: 1.2rem;
    }

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

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

    .profile-section {
        flex-direction: column;
        text-align: center;
        padding: 2rem;
        gap: 2rem;
    }

    .profile-image {
        width: 150px;
        height: 150px;
    }

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

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

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

    .footer .container {
        justify-content: center;
        text-align: center;
    }
}

/* ===================================
   Utility Classes
   =================================== */
.hidden {
    display: none !important;
}

.fade-in {
    animation: fadeIn 0.5s ease-in;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}