/* ==========================================================================
   Michael — Portfolio Stylesheet
   Architecture: Modern Modular CSS with Design Tokens & Accessibility (a11y)
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

/* --------------------------------------------------------------------------
   1. Design Tokens & Root Variables
   -------------------------------------------------------------------------- */
:root {
  /* Color Palette */
  --color-bg: #0e1117;
  --color-card: #151921;
  --color-card-hover: rgba(21, 25, 33, 0.7);
  --color-border: #232a36;
  --color-text-main: #e2e8f0;
  --color-text-muted: #8492a6;
  --color-accent: #10b981;
  --color-accent-glow: rgba(16, 185, 129, 0.25);
  --color-focus-ring: rgba(16, 185, 129, 0.6);

  /* Typography */
  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Layout & Geometry */
  --container-max-width: 768px;
  --navbar-height: 3.75rem;
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
}

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

html {
  scroll-behavior: smooth;
  color-scheme: dark;
}

body {
  background-color: var(--color-bg);
  color: var(--color-text-main);
  font-family: var(--font-sans);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

::selection {
  background-color: var(--color-accent-glow);
  color: var(--color-accent);
}

/* Accessibility Focus Ring */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: 2px;
}

/* Skip to main content link for screen readers & keyboard navigation */
.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  z-index: 999;
  padding: 0.75rem 1.25rem;
  background-color: var(--color-accent);
  color: #042f2e;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 1rem;
}

/* --------------------------------------------------------------------------
   3. Layout & Structure
   -------------------------------------------------------------------------- */
.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.divider {
  height: 1px;
  background-color: var(--color-border);
  width: 100%;
}

.section {
  padding: 6rem 0;
}

.section-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 2.5rem;
}

/* --------------------------------------------------------------------------
   4. Navigation Bar
   -------------------------------------------------------------------------- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background-color: rgba(14, 17, 23, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.nav-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--navbar-height);
}

.logo {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text-main);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
}

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

.nav-right {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.nav-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}

.nav-links a {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color var(--transition-fast);
  position: relative;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--color-text-main);
}

.nav-links a.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--color-accent);
  border-radius: 1px;
}

/* Language Switcher Button */
.lang-btn {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-accent);
  border: 1px solid var(--color-border);
  background-color: var(--color-card);
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.lang-btn:hover {
  border-color: var(--color-accent);
  background-color: var(--color-accent-glow);
}

/* --------------------------------------------------------------------------
   5. Hero Section
   -------------------------------------------------------------------------- */
.hero {
  padding-top: 10rem;
  padding-bottom: 7rem;
}

.hero-tag {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--color-accent);
  margin-bottom: 1.5rem;
  text-shadow: 0 0 12px var(--color-accent-glow);
}

.hero-title {
  font-size: clamp(2.5rem, 5vw, 3.75rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
}

.hero-subtitle {
  font-size: 1.35rem;
  color: rgba(226, 232, 240, 0.85);
  margin-bottom: 0.5rem;
}

.hero-desc {
  font-size: 1.25rem;
  color: var(--color-text-muted);
  max-width: 36rem;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  margin-top: 2.5rem;
}

.cursor-blink {
  display: inline-block;
  font-family: var(--font-mono);
  color: var(--color-accent);
  margin-top: 2.5rem;
  animation: blink 1.1s step-end infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

/* --------------------------------------------------------------------------
   6. Buttons & Interactive Controls
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 500;
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: all var(--transition-normal);
}

.btn-primary {
  background-color: var(--color-accent);
  color: #042f2e;
}

.btn-primary:hover {
  opacity: 0.92;
  transform: translateY(-1px);
  box-shadow: 0 4px 16px var(--color-accent-glow);
}

.btn-secondary {
  border: 1px solid var(--color-border);
  color: var(--color-text-main);
  background-color: transparent;
}

.btn-secondary:hover {
  background-color: var(--color-card);
  border-color: var(--color-text-muted);
}

/* --------------------------------------------------------------------------
   7. Projects List
   -------------------------------------------------------------------------- */
.projects-list {
  display: flex;
  flex-direction: column;
}

.project-item {
  display: flex;
  align-items: flex-start;
  gap: 1.5rem;
  padding: 1.75rem 1rem;
  border-bottom: 1px solid var(--color-border);
  text-decoration: none;
  color: inherit;
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast);
}

.project-item:first-child {
  border-top: 1px solid var(--color-border);
}

.project-item:hover {
  background-color: var(--color-card-hover);
}

.project-id {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--color-text-muted);
  padding-top: 0.2rem;
  flex-shrink: 0;
}

.project-content h3 {
  font-size: 1.15rem;
  font-weight: 600;
  transition: color var(--transition-fast);
}

.project-item:hover .project-content h3 {
  color: var(--color-accent);
}

.project-content p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-top: 0.35rem;
  max-width: 32rem;
}

.project-arrow {
  margin-left: auto;
  color: var(--color-text-muted);
  font-size: 1.25rem;
  opacity: 0.4;
  transition: all var(--transition-fast);
}

.project-item:hover .project-arrow {
  opacity: 1;
  color: var(--color-accent);
  transform: translateX(4px);
}

/* --------------------------------------------------------------------------
   8. Tech Stack Badges
   -------------------------------------------------------------------------- */
.stack-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.stack-badge {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background-color: var(--color-card);
  transition: all var(--transition-fast);
}

.stack-badge:hover {
  border-color: rgba(16, 185, 129, 0.4);
  color: var(--color-accent);
  transform: translateY(-1px);
}

/* --------------------------------------------------------------------------
   9. Contact Section
   -------------------------------------------------------------------------- */
.contact-links {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  font-size: 1.1rem;
}

.contact-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.contact-row .label {
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 0.95rem;
  min-width: 5.5rem;
}

.contact-row a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.contact-row a:hover {
  text-decoration: underline;
  text-underline-offset: 4px;
}

/* --------------------------------------------------------------------------
   10. Legal Pages (Impressum & Datenschutz)
   -------------------------------------------------------------------------- */
.legal-container {
  padding-top: 8rem;
  padding-bottom: 6rem;
}

.legal-header {
  margin-bottom: 3rem;
}

.legal-title {
  font-size: 2.25rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.back-link {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--color-text-muted);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
  transition: color var(--transition-fast);
}

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

.legal-content section {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.legal-block {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.legal-block h2 {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--color-text-main);
}

.legal-block p,
.legal-block ul {
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

.legal-block ul {
  list-style: none;
  padding-left: 0.5rem;
}

.legal-accent-link {
  color: var(--color-accent);
  text-decoration: none;
}

.legal-accent-link:hover {
  text-decoration: underline;
}

/* --------------------------------------------------------------------------
   11. Footer
   -------------------------------------------------------------------------- */
.footer {
  border-top: 1px solid var(--color-border);
  padding: 2.5rem 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

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

@media (min-width: 640px) {
  .footer-content {
    flex-direction: row;
  }
}

.footer-links {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.footer-links a {
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--color-text-main);
}

/* --------------------------------------------------------------------------
   12. Motion Preferences & Responsiveness
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}