/* ===================================
   CSS Variables
   =================================== */
:root {
    /* Colors */
    --color-bg-primary: #000000;
    --color-bg-secondary: #0a0a0a;
    --color-text-primary: #e8e8e8;
    --color-text-secondary: #b8b8b8;
    --color-accent-primary: #c0c0c0;
    --color-accent-secondary: #a8a8a8;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-xxl: 4rem;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.5rem;
    --font-size-2xl: 2rem;
    --font-size-3xl: 2.5rem;
    --font-size-4xl: 3rem;
    --font-size-5xl: 3.5rem;
    
    /* Layout */
    --nav-height: 70px;          /* Nur Navigation */
    --title-height: 250px;       /* Titel-Bereich mit Gradient */
    --total-header-height: 320px; /* Nav + Titel */
    --content-offset: 35%;       /* Links 50% leer, rechts 50% Content */
    
    /* Z-Index Layers */
    --z-background: 1;
    --z-content: 10;
    --z-title: 100;
    --z-nav: 101;
}

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

html {
    scroll-behavior: smooth;
    height: 100%;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
    overflow-x: hidden;
    height: 100%;
}

/* Hide scrollbar but keep functionality */
::-webkit-scrollbar {
    width: 0px;
    background: transparent;
}

* {
    scrollbar-width: none;
    -ms-overflow-style: none;
}

/* ===================================
   EBENE 0: Background Layer (Z-Index: 1)
   Fixed - Profilbild links, Schwarz rechts
   =================================== */
.background-layer {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    z-index: var(--z-background);
    background-color: var(--color-bg-primary);
}

.profile-background {
    position: absolute;
    left: -50px; /* Bild nach links verschieben um den sprung beim Responsive zu Smartphone hübscher zu gestallten */
    top: 0;
    width: auto; /* Automatische Breite basierend auf Höhe */
    height: 100vh;
    overflow: hidden;
}

.profile-image {
    width: auto; /* Behält Aspect Ratio bei */
    height: 100vh; /* Immer volle Höhe */
    object-fit: cover;
    object-position: center top;
    display: block;
    image-rendering: -webkit-optimize-contrast;
    image-rendering: crisp-edges;
    backface-visibility: hidden;
    -webkit-font-smoothing: antialiased;
}

/* ===================================
   EBENE 2.1: Navigation Bar (Z-Index: 101)
   Fixed Top - Nur Navigation
   =================================== */
.navigation-bar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--nav-height);
    z-index: var(--z-nav);
    background: rgba(0, 0, 0, 0.95);
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--spacing-xl);
}

/* ===================================
   EBENE 2.2: Titel-Bereich (Z-Index: 100)
   Gradient für Content-Fade
   =================================== */
.title-fade-layer {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    width: 100%;
    height: var(--title-height);
    z-index: var(--z-title);
    background: linear-gradient(to bottom, 
        rgba(0, 0, 0, 1) 0%, 
        rgba(0, 0, 0, 1) 66%,
        rgba(0, 0, 0, 0.6) 85%,
        rgba(0, 0, 0, 0) 100%);
    pointer-events: none; /* Content darunter klickbar */
}

.title-content {
    position: absolute;
    left: 8%; /* Linkes Drittel */
    top: 50%;
    transform: translateY(-50%);
    pointer-events: auto;
}

.main-title {
    font-size: var(--font-size-5xl);
    font-weight: 700;
    color: var(--color-accent-primary);
    margin: 0 0 var(--spacing-xs) 0;
    line-height: 1.2;
}

.main-subtitle {
    font-size: var(--font-size-xl);
    font-weight: 500;
    color: var(--color-text-secondary);
    margin: 0;
    line-height: 1.4;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
    margin: 0;
    padding: 0;
}

.nav-link {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: var(--font-size-base);
    transition: color 0.3s ease;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-accent-primary);
    transition: width 0.3s ease;
}

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

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

.lang-toggle {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-md);
    background: rgba(26, 26, 26, 0.8);
    color: var(--color-text-primary);
    border: 1px solid var(--color-accent-secondary);
    border-radius: 6px;
    cursor: pointer;
    font-family: var(--font-family);
    font-size: var(--font-size-sm);
    font-weight: 500;
    transition: all 0.3s ease;
}

.lang-toggle:hover {
    background: rgba(30, 30, 30, 0.9);
    border-color: var(--color-accent-primary);
    transform: translateY(-2px);
}

.lang-icon {
    font-size: 1.2rem;
}

/* Mobile Menu Toggle Button */
.mobile-menu-toggle {
    display: none; /* Versteckt auf Desktop */
    flex-direction: column;
    justify-content: space-around;
    width: 32px;
    height: 32px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 4px;
    z-index: 1000;
    position: relative;
}

.burger-line {
    width: 100%;
    height: 3px;
    background: var(--color-accent-primary);
    border-radius: 2px;
    transition: all 0.3s ease;
    transform-origin: center;
}

/* Burger Animation zu X */
.mobile-menu-toggle.active .burger-line:nth-child(1) {
    transform: translateY(10px) rotate(45deg);
}

.mobile-menu-toggle.active .burger-line:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.active .burger-line:nth-child(3) {
    transform: translateY(-10px) rotate(-45deg);
}

/* ===================================
   EBENE 1: Content Layer (Z-Index: 10)
   Scrollable - Nur rechte Spalte gefüllt
   =================================== */
.content-layer {
    position: relative;
    z-index: var(--z-content);
    min-height: 100vh;
    padding-top: var(--title-height);
}

.content-wrapper {
    margin-left: var(--content-offset);
    padding: var(--spacing-xl);
    min-height: calc(100vh - var(--header-height));
}

/* Content Sections */
.content-section {
    padding: var(--spacing-xxl) 0;
    max-width: 900px;
    scroll-margin-top: var(--total-header-height); /* Offset für Navigation + Titel beim Anchor-Sprung */
}

.content-section:first-child {
    padding-top: 0; /* Erste Section direkt nach Header */
}

.section-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-xl);
    color: var(--color-accent-primary);
    position: relative;
    display: inline-block;
    letter-spacing: -0.02em;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -12px;
    left: 0;
    width: 80px;
    height: 4px;
    background: linear-gradient(90deg, var(--color-accent-primary) 0%, transparent 100%);
    border-radius: 2px;
}

.section-content {
    color: var(--color-text-secondary);
    line-height: 1.8;
}

.intro-text {
    font-size: var(--font-size-lg);
    line-height: 1.8;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xl);
    font-weight: 400;
    max-width: 800px;
}

.intro-text::first-line {
    font-weight: 500;
    color: var(--color-accent-primary);
}

/* Key Facts */
.key-facts {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.fact-item {
    text-align: center;
    padding: var(--spacing-xl);
    background: rgba(10, 10, 10, 0.6);
    border-radius: 12px;
    border: 1px solid rgba(192, 192, 192, 0.15);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    backdrop-filter: blur(10px);
}

.fact-item:hover {
    border-color: var(--color-accent-primary);
    background: rgba(10, 10, 10, 0.9);
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
}

.fact-number {
    display: block;
    font-size: var(--font-size-3xl);
    font-weight: 800;
    color: var(--color-accent-primary);
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.03em;
}

.fact-label {
    display: block;
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 500;
}

/* Experience Timeline */
.timeline-item {
    position: relative;
    padding-left: var(--spacing-xl);
    padding-bottom: var(--spacing-xxl);
    border-left: 2px solid rgba(192, 192, 192, 0.2);
    margin-bottom: var(--spacing-lg);
}

.timeline-item:last-child {
    border-left-color: transparent;
    padding-bottom: 0;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -6px;
    top: 0;
    width: 10px;
    height: 10px;
    background: var(--color-accent-primary);
    border-radius: 50%;
    box-shadow: 0 0 0 4px rgba(192, 192, 192, 0.2);
}

.timeline-date {
    display: inline-block;
    font-size: var(--font-size-sm);
    color: var(--color-accent-primary);
    background: rgba(192, 192, 192, 0.1);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: 20px;
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
    letter-spacing: 0.03em;
}

.timeline-item h3 {
    font-size: var(--font-size-xl);
    color: var(--color-text-primary);
    margin: var(--spacing-sm) 0;
    font-weight: 600;
}

.timeline-company {
    font-size: var(--font-size-base);
    color: var(--color-accent-secondary);
    margin-bottom: var(--spacing-md);
    font-weight: 500;
}

.timeline-item p {
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: var(--spacing-md);
}

.timeline-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-md);
}

.tag {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    background: rgba(192, 192, 192, 0.1);
    color: var(--color-text-secondary);
    border-radius: 6px;
    font-size: var(--font-size-sm);
    border: 1px solid rgba(192, 192, 192, 0.2);
    transition: all 0.3s ease;
    font-weight: 500;
}

.tag:hover {
    background: rgba(192, 192, 192, 0.15);
    border-color: var(--color-accent-primary);
    color: var(--color-accent-primary);
}

/* Expertise Grid */
.expertise-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.expertise-card {
    padding: var(--spacing-xl);
    background: rgba(10, 10, 10, 0.6);
    border: 1px solid rgba(192, 192, 192, 0.15);
    border-radius: 12px;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    backdrop-filter: blur(10px);
}

.expertise-card:hover {
    background: rgba(10, 10, 10, 0.9);
    border-color: var(--color-accent-primary);
    transform: translateY(-6px);
    box-shadow: 0 16px 32px rgba(0, 0, 0, 0.4);
}

.expertise-card h3 {
    font-size: var(--font-size-lg);
    color: var(--color-accent-primary);
    margin-bottom: var(--spacing-md);
    font-weight: 600;
}

.expertise-card ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.expertise-card li {
    color: var(--color-text-secondary);
    padding: var(--spacing-xs) 0;
    padding-left: var(--spacing-md);
    position: relative;
    line-height: 1.6;
}

.expertise-card li::before {
    content: '▹';
    position: absolute;
    left: 0;
    color: var(--color-accent-primary);
    font-weight: bold;
}

/* Projects Grid */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(400px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.project-card {
    padding: var(--spacing-xl);
    background: rgba(10, 10, 10, 0.6);
    border: 1px solid rgba(192, 192, 192, 0.15);
    border-radius: 12px;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    backdrop-filter: blur(10px);
}

.project-card:hover {
    background: rgba(10, 10, 10, 0.9);
    border-color: var(--color-accent-primary);
    transform: translateY(-6px);
    box-shadow: 0 16px 32px rgba(0, 0, 0, 0.4);
}

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.project-period {
    display: inline-block;
    font-size: var(--font-size-sm);
    color: var(--color-accent-primary);
    background: rgba(192, 192, 192, 0.1);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: 20px;
    font-weight: 600;
    letter-spacing: 0.03em;
}

.project-role {
    font-size: var(--font-size-sm);
    color: var(--color-accent-secondary);
    font-weight: 500;
}

.project-title {
    font-size: var(--font-size-xl);
    color: var(--color-text-primary);
    margin: var(--spacing-sm) 0;
    font-weight: 600;
    line-height: 1.3;
}

.project-client {
    font-size: var(--font-size-base);
    color: var(--color-accent-secondary);
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
}

.project-program {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    font-style: italic;
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-md);
    border-left: 2px solid rgba(192, 192, 192, 0.2);
}

.project-description {
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: var(--spacing-md);
}

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

/* Education Section */
.education-item {
    padding: var(--spacing-lg);
    background: rgba(10, 10, 10, 0.6);
    border: 1px solid rgba(192, 192, 192, 0.15);
    border-radius: 12px;
    margin-bottom: var(--spacing-lg);
    transition: all 0.3s ease;
}

.education-item:hover {
    border-color: var(--color-accent-primary);
    background: rgba(10, 10, 10, 0.8);
}

.education-item h3 {
    font-size: var(--font-size-lg);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
}

.education-institution {
    font-size: var(--font-size-base);
    color: var(--color-accent-secondary);
    margin-bottom: var(--spacing-sm);
}

.education-date {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    font-weight: 500;
}

.education-item p {
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-top: var(--spacing-sm);
}

/* Certification Cards */
.certification-card {
    padding: var(--spacing-lg);
    background: rgba(10, 10, 10, 0.6);
    border: 1px solid rgba(192, 192, 192, 0.15);
    border-radius: 12px;
    transition: all 0.3s ease;
}

.certification-card:hover {
    border-color: var(--color-accent-primary);
    background: rgba(10, 10, 10, 0.8);
    transform: translateY(-4px);
}

.certification-name {
    font-size: var(--font-size-lg);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
}

.certification-issuer {
    font-size: var(--font-size-sm);
    color: var(--color-accent-secondary);
    margin-bottom: var(--spacing-xs);
}

.certification-year {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    font-weight: 500;
}

/* Professional Development */
.development-item {
    display: flex;
    gap: var(--spacing-lg);
    padding: var(--spacing-md);
    background: rgba(10, 10, 10, 0.4);
    border-left: 2px solid rgba(192, 192, 192, 0.2);
    border-radius: 4px;
    transition: all 0.3s ease;
}

.development-item:hover {
    border-left-color: var(--color-accent-primary);
    background: rgba(10, 10, 10, 0.6);
}

.development-year {
    flex-shrink: 0;
    width: 60px;
    font-size: var(--font-size-base);
    color: var(--color-accent-primary);
    font-weight: 600;
}

.development-topic {
    font-size: var(--font-size-base);
    color: var(--color-text-primary);
    line-height: 1.6;
}

/* Footer */
.site-footer {
    padding: var(--spacing-xl) 0;
    text-align: center;
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    border-top: 1px solid rgba(192, 192, 192, 0.1);
    margin-top: var(--spacing-xxl);
}