/* ============================================================
   GRE BUILDERS — Systems Architecture Design
   No templates. No gradients. No rgba. Strong contrast.
   ============================================================ */

/* --- CSS Custom Properties --- */
:root {
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-tertiary: #1c2128;
  --border: #30363d;
  --border-bright: #484f58;
  --text-primary: #f0f6fc;
  --text-secondary: #c9d1d9;
  --text-muted: #8b949e;
  --accent-blue: #58a6ff;
  --accent-orange: #f78166;
  --accent-green: #3fb950;
  --accent-red: #f85149;
  --font-mono: 'SF Mono', 'Fira Code', 'Cascadia Code', 'JetBrains Mono', 'Consolas', monospace;
  --font-sans: 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --max-width: 1200px;
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 6rem;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  letter-spacing: 0.01em;
}

/* --- Utility: Visually Hidden --- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.15;
  color: var(--text-primary);
}

h1 { font-size: clamp(2.5rem, 6vw, 5rem); letter-spacing: -0.03em; }
h2 { font-size: clamp(2rem, 4vw, 3.5rem); letter-spacing: -0.02em; }
h3 { font-size: clamp(1.25rem, 2.5vw, 1.75rem); }
h4 { font-size: 1.25rem; }

a {
  color: var(--accent-blue);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

p { margin-bottom: 1rem; }

strong { font-weight: 700; color: var(--text-primary); }

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

/* --- Skip Link --- */
.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  background: var(--accent-blue);
  color: #000;
  padding: 0.5rem 1rem;
  z-index: 10000;
  font-weight: 700;
  border-radius: 0;
}

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

/* ============================================================
   HEADER — Terminal Bar
   ============================================================ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border);
  padding: 0;
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--spacing-md);
  height: 56px;
}

.logo {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.05em;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo-prompt {
  color: var(--accent-green);
  font-size: 0.875rem;
}

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

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

/* --- Nav --- */
.nav-list {
  display: flex;
  list-style: none;
  gap: 0.25rem;
}

.nav-list a {
  display: block;
  padding: 0.5rem 1rem;
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.05em;
  border: 1px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}

.nav-list a:hover,
.nav-list a[aria-current="page"] {
  color: var(--accent-blue);
  border-color: var(--border);
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: 1px solid var(--border);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  padding: 0.4rem 0.75rem;
  cursor: pointer;
}

.mobile-menu-btn:hover {
  border-color: var(--accent-blue);
  color: var(--accent-blue);
}

/* ============================================================
   HERO — Command Block
   ============================================================ */
.hero {
  padding: 8rem var(--spacing-md) 6rem;
  max-width: var(--max-width);
  margin: 0 auto;
  min-height: 80vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.hero-terminal {
  border: 1px solid var(--border);
  background: var(--bg-secondary);
  padding: 0;
  max-width: 900px;
}

.terminal-bar {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.625rem 1rem;
  background: var(--bg-tertiary);
  border-bottom: 1px solid var(--border);
}

.terminal-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--border-bright);
}

.terminal-dot:nth-child(1) { background: var(--accent-red); }
.terminal-dot:nth-child(2) { background: var(--accent-orange); }
.terminal-dot:nth-child(3) { background: var(--accent-green); }

.terminal-title {
  margin-left: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

.terminal-body {
  padding: 2rem;
}

.terminal-line {
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  line-height: 1.8;
  margin-bottom: 0.5rem;
}

.terminal-line .prompt {
  color: var(--accent-green);
  margin-right: 0.5rem;
}

.terminal-line .cmd {
  color: var(--text-primary);
}

.terminal-line .arg {
  color: var(--accent-orange);
}

.terminal-line .flag {
  color: var(--accent-blue);
}

.terminal-line .output {
  color: var(--text-secondary);
  padding-left: 1.25rem;
  display: block;
}

.terminal-cursor {
  display: inline-block;
  width: 10px;
  height: 1.2em;
  background: var(--accent-green);
  animation: blink 1s step-end infinite;
  vertical-align: text-bottom;
  margin-left: 2px;
}

@keyframes blink {
  50% { opacity: 0; }
}

.hero-meta {
  display: flex;
  gap: 2rem;
  margin-top: 2.5rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}

.hero-meta span {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.hero-meta .label {
  color: var(--border-bright);
}

.hero-meta .value {
  color: var(--text-secondary);
}

/* ============================================================
   SECTION STYLES
   ============================================================ */
.section {
  padding: var(--spacing-xl) var(--spacing-md);
  position: relative;
}

.section-alt {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.section-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

/* --- Section Header --- */
.section-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-blue);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  display: block;
  margin-bottom: 0.75rem;
}

.section-label::before {
  content: '/// ';
  color: var(--border-bright);
}

.section-title {
  margin-bottom: 2rem;
  position: relative;
}

.section-title::after {
  content: '';
  display: block;
  width: 4rem;
  height: 4px;
  background: var(--accent-blue);
  margin-top: 1rem;
}

.section-desc {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 640px;
  margin-bottom: 3rem;
  line-height: 1.7;
}

/* ============================================================
   SERVICES — Terminal Stack
   ============================================================ */
.services-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}

.service-card {
  background: var(--bg-primary);
  padding: 2.5rem 2rem;
  transition: background 0.2s;
}

.service-card:hover {
  background: var(--bg-tertiary);
}

.service-num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-blue);
  letter-spacing: 0.1em;
  display: block;
  margin-bottom: 0.75rem;
}

.service-card h3 {
  font-size: 1.5rem;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

.service-card p {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  line-height: 1.7;
  margin: 0;
}

/* ============================================================
   STATS — Big Numbers
   ============================================================ */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}

.stat-block {
  background: var(--bg-secondary);
  padding: 3rem 2rem;
  text-align: center;
}

.stat-num {
  font-family: var(--font-mono);
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 700;
  color: var(--accent-orange);
  line-height: 1;
  display: block;
  margin-bottom: 0.5rem;
}

.stat-label {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.stat-icon {
  display: block;
  font-size: 1.5rem;
  margin-bottom: 0.75rem;
}

/* ============================================================
   PROCESS — Vertical Timeline
   ============================================================ */
.process-timeline {
  position: relative;
  padding-left: 3rem;
}

.process-timeline::before {
  content: '';
  position: absolute;
  left: 0.75rem;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--border);
}

.process-step {
  position: relative;
  padding-bottom: 3rem;
}

.process-step:last-child { padding-bottom: 0; }

.process-step::before {
  content: '';
  position: absolute;
  left: -2.625rem;
  top: 0.25rem;
  width: 12px;
  height: 12px;
  border: 2px solid var(--accent-blue);
  background: var(--bg-primary);
  border-radius: 50%;
  z-index: 1;
}

.process-step.active::before {
  background: var(--accent-blue);
}

.process-num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-blue);
  letter-spacing: 0.1em;
}

.process-step h3 {
  margin: 0.25rem 0 0.5rem;
}

.process-step p {
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0;
}

/* ============================================================
   ABOUT — Split Block
   ============================================================ */
.about-block {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 3rem;
  align-items: start;
}

.about-block p {
  font-size: 1.0625rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

.about-details {
  border: 1px solid var(--border);
  padding: 2rem;
  background: var(--bg-tertiary);
}

.about-details dt {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 0.25rem;
}

.about-details dd {
  color: var(--text-primary);
  margin-bottom: 1.25rem;
  font-size: 0.9375rem;
  line-height: 1.6;
}

.about-details dd:last-child { margin-bottom: 0; }

.about-details a {
  color: var(--accent-blue);
  word-break: break-all;
}

.about-details a:hover {
  color: var(--accent-orange);
}

/* ============================================================
   CONTACT — Form
   ============================================================ */
.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
}

.contact-info-block {
  padding: 2rem;
  border: 1px solid var(--border);
  background: var(--bg-tertiary);
}

.contact-info-block h3 {
  margin-bottom: 1.5rem;
}

.contact-detail {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  margin-bottom: 1.5rem;
}

.contact-icon {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  color: var(--accent-blue);
  flex-shrink: 0;
  width: 2rem;
}

.contact-detail .label {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--text-muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  display: block;
}

.contact-detail .value {
  color: var(--text-primary);
  font-size: 0.9375rem;
  word-break: break-all;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
}

.form-group label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

.form-group label .required {
  color: var(--accent-red);
}

.form-group input,
.form-group textarea,
.form-group select {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 0.75rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  border-radius: 0;
  transition: border-color 0.2s;
  width: 100%;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--accent-blue);
  outline: none;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--text-muted);
}

.form-group textarea {
  resize: vertical;
  min-height: 140px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 2rem;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  border: 2px solid var(--accent-blue);
  background: transparent;
  color: var(--accent-blue);
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
  text-transform: uppercase;
  border-radius: 0;
}

.btn:hover {
  background: var(--accent-blue);
  color: #000;
}

.btn-primary {
  background: var(--accent-blue);
  color: #000;
  border-color: var(--accent-blue);
}

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

.btn-orange {
  border-color: var(--accent-orange);
  color: var(--accent-orange);
}

.btn-orange:hover {
  background: var(--accent-orange);
  color: #000;
}

.form-feedback {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  padding: 0.75rem 1rem;
  margin-top: 0.5rem;
  display: none;
}

.form-feedback.success {
  display: block;
  background: var(--bg-tertiary);
  border-left: 4px solid var(--accent-green);
  color: var(--accent-green);
}

.form-feedback.error {
  display: block;
  background: var(--bg-tertiary);
  border-left: 4px solid var(--accent-red);
  color: var(--accent-red);
}

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
  border-top: 1px solid var(--border);
  background: var(--bg-secondary);
  padding: var(--spacing-lg) var(--spacing-md) var(--spacing-md);
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 3rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 2rem;
}

.footer-col h4 {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.footer-col p {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  line-height: 1.7;
  margin: 0;
}

.footer-col address {
  font-style: normal;
  color: var(--text-secondary);
  font-size: 0.9375rem;
  line-height: 1.7;
}

.footer-links {
  list-style: none;
}

.footer-links li { margin-bottom: 0.5rem; }

.footer-links a {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--text-secondary);
}

.footer-links a:hover { color: var(--accent-blue); }

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

.footer-bottom p {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  margin: 0;
}

/* ============================================================
   SCROLL ANIMATIONS
   ============================================================ */
.animate {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate.visible {
  opacity: 1;
  transform: translateY(0);
}

.animate-slide-left {
  opacity: 0;
  transform: translateX(-40px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-slide-left.visible {
  opacity: 1;
  transform: translateX(0);
}

.animate-slide-right {
  opacity: 0;
  transform: translateX(40px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-slide-right.visible {
  opacity: 1;
  transform: translateX(0);
}

.animate-scale {
  opacity: 0;
  transform: scale(0.9);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.animate-scale.visible {
  opacity: 1;
  transform: scale(1);
}

/* Stagger delays for process steps */
.process-step:nth-child(1) { transition-delay: 0s; }
.process-step:nth-child(2) { transition-delay: 0.1s; }
.process-step:nth-child(3) { transition-delay: 0.2s; }
.process-step:nth-child(4) { transition-delay: 0.3s; }

/* ============================================================
   COUNTER ANIMATION
   ============================================================ */
.stat-num.counting {
  transition: none;
}

/* ============================================================
   PRIVACY & TERMS PAGES
   ============================================================ */
.legal-page {
  padding: 7rem var(--spacing-md) var(--spacing-xl);
  max-width: 780px;
  margin: 0 auto;
}

.legal-page h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  margin-bottom: 0.5rem;
}

.legal-page .legal-meta {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-bottom: 2.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}

.legal-page h2 {
  font-size: 1.375rem;
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  color: var(--accent-blue);
}

.legal-page p {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
}

.legal-page ul,
.legal-page ol {
  margin-bottom: 1.25rem;
  padding-left: 1.5rem;
  color: var(--text-secondary);
}

.legal-page li {
  font-size: 1rem;
  line-height: 1.8;
  margin-bottom: 0.5rem;
}

.legal-page address {
  font-style: normal;
  color: var(--text-primary);
  font-size: 1rem;
  line-height: 1.8;
}

.legal-page strong {
  color: var(--text-primary);
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 768px) {
  .header-inner {
    padding: 0 1rem;
  }

  .nav-list {
    display: none;
    position: absolute;
    top: 56px;
    left: 0;
    right: 0;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: 0.5rem 0;
  }

  .nav-list.open {
    display: flex;
  }

  .nav-list a {
    padding: 0.75rem 1rem;
    font-size: 0.875rem;
  }

  .mobile-menu-btn {
    display: block;
  }

  .hero {
    padding: 6rem 1rem 3rem;
  }

  .terminal-body {
    padding: 1.25rem;
  }

  .terminal-line {
    font-size: 0.8125rem;
  }

  .services-list {
    grid-template-columns: 1fr;
  }

  .stats-grid {
    grid-template-columns: 1fr 1fr;
  }

  .about-block {
    grid-template-columns: 1fr;
  }

  .contact-layout {
    grid-template-columns: 1fr;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .section {
    padding: 3rem 1rem;
  }

  .legal-page {
    padding: 5rem 1rem 3rem;
  }
}

@media (max-width: 480px) {
  .stats-grid {
    grid-template-columns: 1fr;
  }

  .hero-meta {
    flex-direction: column;
    gap: 0.75rem;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}

/* ============================================================
   PRINT
   ============================================================ */
@media print {
  .site-header,
  .mobile-menu-btn,
  .skip-link { display: none; }

  body { background: #fff; color: #000; }

  .section { padding: 1rem 0; border: none; }
}