/* Google Fonts Import - Inter */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

/* CSS Custom Properties for Design System */
:root {
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  
  /* Color Palette - Business Light Mode */
  --bg-body: #f8fafc;        /* Soft slate background */
  --bg-card: #ffffff;        /* Pure white for cards/header */
  --text-primary: #0f172a;   /* Slate-900 for high contrast headings */
  --text-secondary: #334155; /* Slate-700 for body text readability */
  --text-muted: #64748b;     /* Slate-500 for secondary details/dates */
  
  /* Brand Accent Colors */
  --color-primary: #1e40af;   /* Deep corporate blue */
  --color-accent: #2563eb;    /* Bright blue for interactive states */
  --color-border: #e2e8f0;    /* Clean, thin slate borders */
  --color-border-hover: #cbd5e1;
  
  /* Spacing & Sizing */
  --container-width: 820px;
  --header-height: 70px;
  --border-radius: 8px;
  
  /* Animations */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 1.5rem);
}

body {
  font-family: var(--font-primary);
  background-color: var(--bg-body);
  color: var(--text-secondary);
  line-height: 1.625;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* Container */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Sticky Header */
header {
  position: sticky;
  top: 0;
  height: var(--header-height);
  background-color: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  z-index: 100;
  display: flex;
  align-items: center;
}

header .nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
}

.logo {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.025em;
  text-decoration: none;
  transition: color var(--transition-fast);
}

.logo:hover {
  color: var(--color-accent);
}

nav ul {
  display: flex;
  list-style: none;
  gap: 1.25rem;
}

nav a {
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 0.25rem 0;
  transition: color var(--transition-fast);
}

nav a:hover {
  color: var(--color-accent);
}

/* Content Layout */
main {
  padding: 3.5rem 0 5rem;
}

section {
  margin-bottom: 5rem;
}

section:last-of-type {
  margin-bottom: 2rem;
}

/* Section Headings */
.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 2rem;
  letter-spacing: -0.02em;
  border-bottom: 2px solid var(--color-border);
  padding-bottom: 0.5rem;
  display: inline-block;
}

/* About Me (Über mich) Sektion */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 160px;
  gap: 2.5rem;
  align-items: start;
}

.about-text h1 {
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.2;
  margin-bottom: 0.5rem;
  letter-spacing: -0.03em;
}

.about-text .subtitle {
  font-size: 1.125rem;
  font-weight: 500;
  color: var(--color-primary);
  margin-bottom: 1.5rem;
}

.about-text p {
  margin-bottom: 1.25rem;
  font-size: 1rem;
}

.about-image {
  display: flex;
  justify-content: center;
}

.profile-pic {
  width: 150px;
  height: 150px;
  border-radius: 50%;
  object-fit: cover;
  border: 1px solid var(--color-border);
  background-color: var(--bg-card);
  padding: 4px;
}

/* Sektions-integrierte Kontakt- & Social-Links */
.contact-links {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px dashed var(--color-border);
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
}

.contact-link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.contact-link:hover {
  color: var(--color-accent);
}

.contact-divider {
  color: var(--color-border);
  user-select: none;
}

/* Expertise & Tech-Stack Sektion */
.expertise-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
}

.expertise-column h3 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 1.25rem;
}

.tech-list {
  list-style: none;
}

.tech-item {
  position: relative;
  padding: 0.5rem 0 0.5rem 1.25rem;
  border-bottom: 1px solid rgba(226, 232, 240, 0.5);
  font-size: 0.95rem;
}

.tech-item::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--color-primary);
}

.tech-item strong {
  color: var(--text-primary);
  font-weight: 600;
}

/* Projekte Showcase Sektion */
.project-stack {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.project-card {
  background-color: var(--bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: 1.75rem;
  transition: border-color var(--transition-normal), transform var(--transition-normal);
}

.project-card:hover {
  border-color: var(--color-border-hover);
  transform: translateY(-2px);
}

.project-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 0.75rem;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.project-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}

.project-meta {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.project-tag {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-primary);
  background-color: rgba(30, 64, 175, 0.08); /* Soft corporate blue background */
  padding: 0.125rem 0.5rem;
  border-radius: 4px;
}

.project-description {
  font-size: 0.95rem;
  margin-bottom: 1rem;
}

.project-link-group {
  display: flex;
  gap: 1.25rem;
}

.project-link {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

/* Blog / Aktuelles Sektion */
.blog-stack {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.blog-post {
  border-left: 3px solid var(--color-border);
  padding-left: 1.5rem;
  transition: border-left-color var(--transition-normal);
}

.blog-post:hover {
  border-left-color: var(--color-accent);
}

.post-date {
  font-size: 0.825rem;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
}

.post-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
  line-height: 1.3;
}

.post-excerpt {
  font-size: 0.95rem;
  margin-bottom: 0.75rem;
}

.post-read-more {
  display: inline-block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-primary);
  text-decoration: none;
  cursor: pointer;
  transition: color var(--transition-fast);
}

.post-read-more:hover {
  color: var(--color-accent);
}

/* Expandable blog content styling */
.post-full-content {
  display: none;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px dashed var(--color-border);
  font-size: 0.95rem;
  animation: fadeIn 0.3s ease;
}

.post-full-content.visible {
  display: block;
}

.post-full-content h4 {
  font-size: 1.05rem;
  color: var(--text-primary);
  margin: 1.25rem 0 0.5rem;
}

.post-full-content h4:first-of-type {
  margin-top: 0;
}

.post-full-content ul, .post-full-content ol {
  margin-left: 1.25rem;
  margin-bottom: 1rem;
}

.post-full-content li {
  margin-bottom: 0.25rem;
}

.post-full-content blockquote {
  border-left: 3px solid var(--color-border-hover);
  padding-left: 1rem;
  color: var(--text-muted);
  margin: 1rem 0;
  font-style: italic;
}

.table-container {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin: 1.5rem 0;
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  scrollbar-width: thin;
}

.post-full-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 0;
  font-size: 0.9rem;
}

.post-full-content th, .post-full-content td {
  border: 1px solid var(--color-border);
  padding: 0.75rem 1rem;
  text-align: left;
  min-width: 120px;
}

.post-full-content th {
  background-color: var(--bg-body);
  color: var(--text-primary);
  font-weight: 600;
}

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Footer Styling */
footer {
  border-top: 1px solid var(--color-border);
  padding: 2.5rem 0;
  background-color: var(--bg-card);
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
}

footer p {
  margin-bottom: 0.5rem;
}

/* Responsive Styles */
@media (max-width: 768px) {
  :root {
    --header-height: 60px;
  }
  
  main {
    padding: 2rem 0 3.5rem;
  }
  
  section {
    margin-bottom: 3.5rem;
  }
  
  .section-title {
    font-size: 1.35rem;
    margin-bottom: 1.5rem;
  }
  
  .about-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  
  .about-image {
    order: -1;
    justify-content: flex-start;
  }
  
  .profile-pic {
    width: 120px;
    height: 120px;
  }
  
  .about-text h1 {
    font-size: 1.875rem;
  }
  
  .about-text .subtitle {
    font-size: 1rem;
    margin-bottom: 1rem;
  }
  
  .expertise-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  
  .contact-links {
    flex-direction: column;
    gap: 0.75rem;
    align-items: flex-start;
  }
  
  .contact-divider {
    display: none;
  }
  
  header {
    height: auto;
    padding: 0.75rem 0;
  }
  
  header .nav-container {
    flex-direction: column;
    justify-content: center;
    gap: 0.75rem;
    padding: 0.25rem 0;
    align-items: center;
  }
  
  nav ul {
    gap: 0.5rem 1rem;
    justify-content: center;
    flex-wrap: wrap;
  }
  
  nav a {
    padding: 0.5rem;
    font-size: 0.875rem;
    display: inline-block;
  }
  
  .project-card {
    padding: 1.25rem;
  }
  
  .blog-post {
    padding-left: 1rem;
  }
  
  .post-read-more {
    padding: 0.5rem 0;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 1rem;
  }
}