/* ========================================================
   Samsung Galaxy S8 Linux Homelab - Engineering Stylesheet
   Strictly Zero Emojis - Responsive Dark-Mode Layout
   ======================================================== */

:root {
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-tertiary: #21262d;
  --border-color: #30363d;
  --border-accent: #388bfd;
  --text-primary: #f0f6fc;
  --text-secondary: #8b949e;
  --text-muted: #6e7681;
  --accent-blue: #58a6ff;
  --accent-cyan: #39c5bb;
  --accent-green: #3fb950;
  --accent-orange: #d29922;
  --code-bg: #0b0f14;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --max-width: 1200px;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.65;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--accent-blue);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* Header & Navigation */
header.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(22, 27, 34, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border-color);
  padding: 0.75rem 1.5rem;
}

.header-container {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo-badge {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--accent-cyan);
  background-color: rgba(57, 197, 187, 0.1);
  padding: 0.25rem 0.6rem;
  border-radius: 4px;
  border: 1px solid rgba(57, 197, 187, 0.25);
  letter-spacing: 0.5px;
}

nav.main-nav {
  display: flex;
  gap: 1.25rem;
  font-size: 0.9rem;
}

nav.main-nav a {
  color: var(--text-secondary);
  transition: color 0.15s ease;
}

nav.main-nav a:hover {
  color: var(--text-primary);
  text-decoration: none;
}

/* Hero Section */
.hero {
  padding: 4.5rem 1.5rem 3.5rem;
  border-bottom: 1px solid var(--border-color);
  background: radial-gradient(circle at top right, rgba(56, 139, 253, 0.08), transparent 60%);
  text-align: center;
}

.hero-container {
  max-width: 900px;
  margin: 0 auto;
}

.hero-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-transform: uppercase;
  color: var(--accent-blue);
  background: rgba(88, 166, 255, 0.1);
  border: 1px solid rgba(88, 166, 255, 0.25);
  padding: 0.2rem 0.6rem;
  border-radius: 20px;
  margin-bottom: 1rem;
  letter-spacing: 1px;
}

h1.hero-title {
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 1rem;
  color: var(--text-primary);
  letter-spacing: -0.5px;
}

p.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
  line-height: 1.6;
}

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

.btn {
  display: inline-block;
  padding: 0.65rem 1.25rem;
  border-radius: 6px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: all 0.15s ease;
}

.btn-primary {
  background-color: var(--border-accent);
  color: #ffffff;
  border: 1px solid var(--border-accent);
}

.btn-primary:hover {
  background-color: #2c7beb;
  text-decoration: none;
}

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

.btn-secondary:hover {
  background-color: var(--bg-tertiary);
  border-color: var(--text-muted);
  text-decoration: none;
}

/* Key Metrics Strip */
.metrics-strip {
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  padding: 1.5rem 1.5rem;
}

.metrics-grid {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
  text-align: center;
}

.metric-card {
  padding: 0.5rem;
}

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

.metric-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-top: 0.25rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* Main Content Layout */
.main-wrapper {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 3rem 1.5rem;
}

section.content-section {
  margin-bottom: 4rem;
  scroll-margin-top: 5rem;
}

h2.section-heading {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-primary);
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.75rem;
  margin-bottom: 1.5rem;
  letter-spacing: -0.3px;
}

h3.sub-heading {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--accent-blue);
  margin: 1.75rem 0 0.75rem;
}

p.section-intro {
  color: var(--text-secondary);
  font-size: 1.05rem;
  margin-bottom: 1.5rem;
}

/* Data Tables */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  margin: 1.25rem 0 2rem;
  border: 1px solid var(--border-color);
  border-radius: 6px;
}

table.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  text-align: left;
}

table.data-table th {
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  font-weight: 600;
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--border-color);
  white-space: nowrap;
}

table.data-table td {
  padding: 0.8rem 1rem;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-secondary);
}

table.data-table tr:nth-child(even) td {
  background-color: rgba(22, 27, 34, 0.4);
}

table.data-table tr:hover td {
  background-color: rgba(56, 139, 253, 0.05);
  color: var(--text-primary);
}

/* Feature Cards Grid */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.5rem;
  margin: 1.5rem 0;
}

.feature-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1.5rem;
  transition: transform 0.15s ease, border-color 0.15s ease;
}

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

.card-title {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.card-port {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent-cyan);
  margin-bottom: 0.75rem;
}

.card-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* Code Blocks */
pre.code-block {
  background-color: var(--code-bg);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 1rem 1.25rem;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: #e6edf3;
  margin: 1rem 0 1.5rem;
  line-height: 1.55;
}

code.inline-code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background-color: rgba(110, 118, 129, 0.2);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  color: var(--accent-cyan);
}

/* Callout Boxes */
.callout {
  background-color: rgba(56, 139, 253, 0.08);
  border-left: 4px solid var(--border-accent);
  padding: 1rem 1.25rem;
  border-radius: 0 6px 6px 0;
  margin: 1.25rem 0;
  color: var(--text-primary);
  font-size: 0.95rem;
}

.callout-warning {
  background-color: rgba(210, 153, 34, 0.1);
  border-left-color: var(--accent-orange);
}

/* Footer */
footer.site-footer {
  border-top: 1px solid var(--border-color);
  background-color: var(--bg-secondary);
  padding: 2.5rem 1.5rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.footer-links {
  margin-bottom: 1rem;
  display: flex;
  justify-content: center;
  gap: 1.5rem;
}

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

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

/* Responsive adjustments */
@media (max-width: 768px) {
  h1.hero-title {
    font-size: 2rem;
  }
  
  nav.main-nav {
    display: none;
  }
  
  .cards-grid {
    grid-template-columns: 1fr;
  }
}