/* 73bytes Software Engineering - Core Stylesheet */
:root {
  --bg-primary: #0A0C10;
  --bg-secondary: #11141B;
  --bg-card: #0F131A;
  --bg-card-hover: #161B24;
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-active: rgba(59, 130, 246, 0.5);
  --text-primary: #F1F5F9;
  --text-secondary: #94A3B8;
  --text-muted: #64748B;
  --accent-blue: #3B82F6;
  --accent-blue-hover: #2563EB;
  --accent-emerald: #10B981;
  --font-mono: 'JetBrains Mono', monospace, ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas;
  --font-sans: 'Plus Jakarta Sans', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --container-max: 1200px;
}

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

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

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* Typography & Utilities */
.font-mono {
  font-family: var(--font-mono);
}

.font-sans {
  font-family: var(--font-sans);
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s ease;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

input, textarea, select {
  font-family: inherit;
  color: inherit;
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

/* Header & Navigation */
header.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: rgba(10, 12, 16, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
  transition: border-color 0.2s ease;
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.5rem;
}

.logo-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
}

.logo-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: 4px;
  background-color: var(--accent-blue);
  color: #FFFFFF;
  font-size: 0.85rem;
  font-weight: 800;
}

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

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

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
}

.nav-link {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: color 0.2s ease;
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.75rem;
  border-radius: 9999px;
  background-color: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.2);
  color: var(--accent-emerald);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  white-space: nowrap;
}

.status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--accent-emerald);
  box-shadow: 0 0 8px var(--accent-emerald);
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.6rem 1.2rem;
  border-radius: 4px;
  background-color: var(--accent-blue);
  color: #FFFFFF;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 600;
  transition: background-color 0.2s ease, transform 0.1s ease;
}

.btn-primary:hover {
  background-color: var(--accent-blue-hover);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.6rem 1.2rem;
  border-radius: 4px;
  background-color: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 500;
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.btn-secondary:hover {
  background-color: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
}

.mobile-menu-btn {
  display: none;
  padding: 0.5rem;
  color: var(--text-primary);
  font-size: 1.5rem;
}

/* Hero Section */
.hero-section {
  padding: 6rem 0 5rem;
  position: relative;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
  align-items: center;
}

@media (min-width: 992px) {
  .hero-grid {
    grid-template-columns: 1.2fr 0.8fr;
  }
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-blue);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 1.25rem;
}

.hero-title {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: #FFFFFF;
  margin-bottom: 1.5rem;
}

.hero-title span.accent {
  color: var(--accent-blue);
}

.hero-description {
  font-size: 1.125rem;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 580px;
  margin-bottom: 2.25rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 3rem;
}

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-subtle);
}

.metric-item {
  display: flex;
  flex-direction: column;
}

.metric-value {
  font-family: var(--font-mono);
  font-size: 1.75rem;
  font-weight: 700;
  color: #FFFFFF;
}

.metric-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-top: 0.25rem;
}

/* Terminal / Radar Card */
.terminal-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.terminal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-subtle);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.terminal-dots {
  display: flex;
  gap: 0.4rem;
}

.terminal-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: rgba(255, 255, 255, 0.2);
}

.terminal-body {
  padding: 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.7;
}

.code-line {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  margin-bottom: 0.4rem;
}

.code-prompt {
  color: var(--accent-blue);
  user-select: none;
}

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

.code-success {
  color: var(--accent-emerald);
}

.code-highlight {
  color: #FFFFFF;
  font-weight: 600;
}

/* Section Common */
.section {
  padding: 6rem 0;
  position: relative;
}

.section-header {
  margin-bottom: 3.5rem;
}

.section-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-blue);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.5rem;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: #FFFFFF;
  margin-bottom: 0.75rem;
}

.section-subtitle {
  color: var(--text-secondary);
  max-width: 600px;
  font-size: 1rem;
}

/* Grid & Cards */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.5rem;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 1.5rem;
}

.card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  padding: 1.75rem;
  transition: transform 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}

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

.card-icon {
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 6px;
  background-color: rgba(59, 130, 246, 0.1);
  border: 1px solid rgba(59, 130, 246, 0.2);
  color: var(--accent-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1rem;
  margin-bottom: 1.25rem;
}

.card-title {
  font-size: 1.15rem;
  font-weight: 600;
  color: #FFFFFF;
  margin-bottom: 0.5rem;
}

.card-desc {
  color: var(--text-secondary);
  font-size: 0.875rem;
  line-height: 1.6;
  margin-bottom: 1.25rem;
}

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

.tag {
  display: inline-block;
  padding: 0.2rem 0.5rem;
  border-radius: 3px;
  background-color: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--text-secondary);
}

/* Interactive Architecture Sandbox */
.sandbox-wrapper {
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  padding: 2rem;
}

.sandbox-controls {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

@media (min-width: 992px) {
  .sandbox-controls {
    grid-template-columns: 1fr 1fr;
  }
}

.slider-container {
  margin-bottom: 1.5rem;
}

.slider-header {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  margin-bottom: 0.75rem;
}

input[type="range"] {
  width: 100%;
  height: 6px;
  background: var(--bg-secondary);
  border-radius: 4px;
  outline: none;
  accent-color: var(--accent-blue);
  cursor: pointer;
}

.toggle-group {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.toggle-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: 4px;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  transition: border-color 0.2s ease;
}

.toggle-label:hover {
  border-color: rgba(255, 255, 255, 0.2);
}

.toggle-label input {
  accent-color: var(--accent-blue);
  width: 16px;
  height: 16px;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.stat-box {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: 4px;
  padding: 1rem;
  text-align: center;
}

.stat-label {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--text-muted);
  text-transform: uppercase;
}

.stat-number {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent-blue);
  margin-top: 0.25rem;
}

.topology-flow {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.5rem;
  margin-top: 1rem;
}

.topology-node {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: 4px;
  padding: 0.75rem 0.5rem;
  text-align: center;
  font-family: var(--font-mono);
}

.node-title {
  font-size: 0.6875rem;
  color: var(--text-muted);
  text-transform: uppercase;
}

.node-val {
  font-size: 0.8125rem;
  font-weight: 600;
  color: #FFFFFF;
  margin-top: 0.2rem;
}

.node-lat {
  font-size: 0.6875rem;
  color: var(--accent-emerald);
  margin-top: 0.2rem;
}

/* Contact Form */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
}

@media (min-width: 992px) {
  .contact-grid {
    grid-template-columns: 0.8fr 1.2fr;
  }
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}

.form-input, .form-textarea, .form-select {
  width: 100%;
  padding: 0.75rem 1rem;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: 4px;
  color: #FFFFFF;
  font-size: 0.875rem;
  outline: none;
  transition: border-color 0.2s ease;
}

.form-input:focus, .form-textarea:focus, .form-select:focus {
  border-color: var(--accent-blue);
}

.form-textarea {
  min-height: 120px;
  resize: vertical;
}

/* Impressum Specific Styles */
.impressum-container {
  padding: 4rem 0 6rem;
  max-width: 860px;
  margin: 0 auto;
}

.impressum-header {
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 2rem;
  margin-bottom: 3rem;
}

.impressum-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 1.5rem;
}

.lang-switch {
  display: inline-flex;
  border-radius: 4px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  padding: 2px;
}

.lang-btn {
  padding: 0.4rem 0.8rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  border-radius: 2px;
  transition: all 0.2s ease;
}

.lang-btn.active {
  background: var(--accent-blue);
  color: #FFFFFF;
  font-weight: 600;
}

.impressum-block {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  padding: 2rem;
  margin-bottom: 2rem;
}

.impressum-block h3 {
  font-size: 1.25rem;
  color: #FFFFFF;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-subtle);
  font-family: var(--font-mono);
}

.impressum-block p {
  color: var(--text-secondary);
  margin-bottom: 1rem;
  font-size: 0.9375rem;
  line-height: 1.7;
}

.impressum-block p strong {
  color: #FFFFFF;
}

.info-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
}

.info-table td {
  padding: 0.6rem 0;
  border-bottom: 1px solid var(--border-subtle);
}

.info-table td:first-child {
  color: var(--text-muted);
  width: 35%;
}

.info-table td:last-child {
  color: var(--text-primary);
  font-weight: 500;
}

/* Footer */
footer.site-footer {
  background-color: #07090C;
  border-top: 1px solid var(--border-subtle);
  padding: 4rem 0 2rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 2.5rem;
  padding-bottom: 3rem;
  border-bottom: 1px solid var(--border-subtle);
}

.footer-title {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 1.25rem;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-links a {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.footer-links a:hover {
  color: #FFFFFF;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  padding-top: 2rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Modal */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(8px);
  z-index: 100;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
}

.modal-overlay.active {
  display: flex;
}

.modal-content {
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  width: 100%;
  max-width: 680px;
  max-height: 90vh;
  overflow-y: auto;
  padding: 2rem;
  position: relative;
}

.modal-close {
  position: absolute;
  top: 1.25rem;
  right: 1.25rem;
  font-size: 1.25rem;
  color: var(--text-muted);
}

.modal-close:hover {
  color: #FFFFFF;
}

/* Responsive adjustments */
@media (max-width: 768px) {
  .nav-links, .nav-actions .btn-primary {
    display: none;
  }
  .mobile-menu-btn {
    display: block;
  }
  .hero-metrics {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
  .stats-grid {
    grid-template-columns: 1fr;
  }
  .topology-flow {
    grid-template-columns: 1fr 1fr;
  }
}