/* ============================================================
   XZEN.NET — Corporate Technology Theme
   ============================================================ */

:root {
  --bg-primary:    #080c14;
  --bg-secondary:  #0d1422;
  --bg-card:       #111827;
  --bg-card-hover: #161f30;
  --border:        rgba(99, 179, 237, 0.12);
  --border-hover:  rgba(99, 179, 237, 0.3);
  --accent:        #3b82f6;
  --accent-bright: #60a5fa;
  --accent-glow:   rgba(59, 130, 246, 0.15);
  --text-primary:  #f0f4ff;
  --text-secondary:#94a3b8;
  --text-muted:    #4b5563;
  --tag-bg:        rgba(59, 130, 246, 0.1);
  --tag-border:    rgba(59, 130, 246, 0.25);
  --radius:        8px;
  --radius-lg:     14px;
  --shadow:        0 1px 3px rgba(0,0,0,0.4), 0 4px 16px rgba(0,0,0,0.3);
  --shadow-glow:   0 0 40px rgba(59, 130, 246, 0.08);
  --font-sans:     'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
  --font-mono:     'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
  --max-width:     1200px;
  --nav-height:    68px;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img, svg { display: block; max-width: 100%; }
button { cursor: pointer; font-family: inherit; }
input, textarea {
  font-family: inherit;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-primary);
  border-radius: var(--radius);
  padding: 0.75rem 1rem;
  width: 100%;
  font-size: 0.95rem;
  transition: border-color 0.2s, box-shadow 0.2s;
  outline: none;
}
input::placeholder, textarea::placeholder { color: var(--text-muted); }
input:focus, textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}
textarea { resize: vertical; }

/* ── Site wrapper ── */
.site-wrapper { min-height: 100vh; }

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius);
  font-size: 0.925rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  transition: all 0.2s;
  border: none;
  white-space: nowrap;
}
.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 0 20px rgba(59,130,246,0.3);
}
.btn-primary:hover {
  background: var(--accent-bright);
  box-shadow: 0 0 30px rgba(59,130,246,0.45);
  transform: translateY(-1px);
}
.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border);
}
.btn-ghost:hover {
  border-color: var(--border-hover);
  color: var(--text-primary);
  background: rgba(255,255,255,0.04);
}
.btn-full { width: 100%; justify-content: center; }

/* ── Section shared ── */
.section-container { max-width: var(--max-width); margin: 0 auto; padding: 0 2rem; }
.section-header { text-align: center; margin-bottom: 4rem; }
.section-header h2 { font-size: clamp(1.8rem, 4vw, 2.5rem); font-weight: 700; margin-bottom: 1rem; }
.section-header p { color: var(--text-secondary); max-width: 560px; margin: 0 auto; font-size: 1.05rem; }
.section-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-bright);
  background: var(--accent-glow);
  border: 1px solid rgba(59,130,246,0.2);
  padding: 0.3rem 0.9rem;
  border-radius: 100px;
  margin-bottom: 1rem;
}

/* ============================================================
   NAV
   ============================================================ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-height);
  background: rgba(8, 12, 20, 0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}
.nav-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}
.logo-x    { color: var(--accent-bright); }
.logo-zen  { color: var(--text-primary); }
.logo-dot  { color: var(--accent); }
.logo-net  { color: var(--text-secondary); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
}
.nav-links a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--text-primary); }
.nav-links .nav-cta {
  background: var(--accent);
  color: #fff;
  padding: 0.5rem 1.2rem;
  border-radius: var(--radius);
  font-weight: 600;
  transition: background 0.2s, box-shadow 0.2s;
}
.nav-links .nav-cta:hover {
  background: var(--accent-bright);
  box-shadow: 0 0 18px rgba(59,130,246,0.35);
}

.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  padding: 4px;
}
.nav-hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-secondary);
  border-radius: 2px;
  transition: all 0.3s;
}

/* ============================================================
   HERO
   ============================================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--nav-height);
  overflow: hidden;
}
.hero-bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(59,130,246,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(59,130,246,0.04) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, black 40%, transparent 100%);
}
.hero::before {
  content: '';
  position: absolute;
  top: 15%;
  left: 50%;
  transform: translateX(-50%);
  width: 700px;
  height: 400px;
  background: radial-gradient(ellipse, rgba(59,130,246,0.12) 0%, transparent 70%);
  pointer-events: none;
}
.hero-container {
  position: relative;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 6rem 2rem;
  text-align: center;
}
.hero-badge {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-bright);
  background: var(--accent-glow);
  border: 1px solid rgba(59,130,246,0.2);
  padding: 0.4rem 1rem;
  border-radius: 100px;
  margin-bottom: 2rem;
}
.hero-title {
  font-size: clamp(2.5rem, 7vw, 5rem);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
}
.hero-accent {
  background: linear-gradient(135deg, var(--accent-bright) 0%, #a78bfa 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto 2.5rem;
  line-height: 1.7;
}
.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 4rem;
}
.hero-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2.5rem;
  flex-wrap: wrap;
}
.stat { text-align: center; }
.stat-number {
  display: block;
  font-size: 2rem;
  font-weight: 800;
  font-family: var(--font-mono);
  color: var(--text-primary);
  letter-spacing: -0.03em;
}
.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 500;
}
.stat-divider {
  width: 1px;
  height: 40px;
  background: var(--border);
}

/* ============================================================
   SERVICES
   ============================================================ */
.services {
  padding: 7rem 0;
  background: var(--bg-secondary);
}
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}
.service-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: border-color 0.25s, transform 0.25s, box-shadow 0.25s;
}
.service-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-3px);
  box-shadow: var(--shadow), var(--shadow-glow);
}
.card-icon {
  font-size: 1.6rem;
  color: var(--accent-bright);
  margin-bottom: 1rem;
  display: block;
}
.service-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}
.service-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 1.25rem;
}
.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.tag {
  font-size: 0.72rem;
  font-weight: 600;
  font-family: var(--font-mono);
  color: var(--accent-bright);
  background: var(--tag-bg);
  border: 1px solid var(--tag-border);
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  letter-spacing: 0.03em;
}

/* ============================================================
   ABOUT
   ============================================================ */
.about { padding: 7rem 0; }
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
  align-items: center;
}
.about-content .section-tag { margin-bottom: 1rem; }
.about-content h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 1.5rem;
}
.about-content > p {
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 1rem;
  font-size: 0.975rem;
}
.about-pillars {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  margin-top: 2rem;
}
.pillar {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}
.pillar-icon {
  font-size: 1.3rem;
  color: var(--accent-bright);
  margin-top: 2px;
  flex-shrink: 0;
}
.pillar strong { display: block; font-size: 0.95rem; color: var(--text-primary); margin-bottom: 0.2rem; }
.pillar p { font-size: 0.85rem; color: var(--text-muted); margin: 0; }

/* Tech node visual */
.about-visual {
  display: flex;
  align-items: center;
  justify-content: center;
}
.tech-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  max-width: 360px;
}
.tech-node {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.75rem 0.5rem;
  text-align: center;
  font-size: 0.8rem;
  font-weight: 600;
  font-family: var(--font-mono);
  color: var(--text-secondary);
  transition: border-color 0.25s, color 0.25s, box-shadow 0.25s;
}
.tech-node:hover {
  border-color: var(--accent);
  color: var(--accent-bright);
  box-shadow: 0 0 16px rgba(59,130,246,0.15);
}
.tech-node.node-primary {
  background: var(--accent-glow);
  border-color: var(--accent);
  color: var(--accent-bright);
  grid-column: 2;
  grid-row: 2;
  font-size: 0.9rem;
}

/* ============================================================
   CONTACT
   ============================================================ */
.contact {
  padding: 7rem 0;
  background: var(--bg-secondary);
}
.contact-centered {
  max-width: 560px;
  margin: 0 auto;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.25rem;
}
.contact-centered h2 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 700;
  line-height: 1.25;
}
.contact-centered > p {
  color: var(--text-secondary);
  line-height: 1.7;
  font-size: 0.975rem;
}
.contact-details { display: flex; flex-direction: column; gap: 0.75rem; align-items: center; }
.contact-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
}
.contact-icon { color: var(--accent-bright); }

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  background: var(--bg-primary);
  border-top: 1px solid var(--border);
  padding: 4rem 0 0;
}
.footer-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 4rem;
  padding-bottom: 3rem;
}
.footer-brand .nav-logo { margin-bottom: 1rem; display: inline-flex; }
.footer-brand p {
  font-size: 0.875rem;
  color: var(--text-muted);
  max-width: 260px;
  line-height: 1.6;
}
.footer-links { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; }
.footer-col h4 {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}
.footer-col ul { list-style: none; display: flex; flex-direction: column; gap: 0.6rem; }
.footer-col a {
  font-size: 0.875rem;
  color: var(--text-muted);
  transition: color 0.2s;
}
.footer-col a:hover { color: var(--text-primary); }
.footer-bottom {
  border-top: 1px solid var(--border);
  padding: 1.25rem 2rem;
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1024px) {
  .services-grid { grid-template-columns: repeat(2, 1fr); }
  .about-grid, .contact-inner { grid-template-columns: 1fr; gap: 3rem; }
  .about-visual { display: none; }
  .footer-container { grid-template-columns: 1fr; gap: 2rem; }
}

@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: var(--nav-height);
    left: 0; right: 0;
    background: var(--bg-secondary);
    flex-direction: column;
    gap: 0;
    padding: 1rem 0;
    border-bottom: 1px solid var(--border);
    transform: translateY(-120%);
    transition: transform 0.3s ease;
  }
  .nav-links.open { transform: translateY(0); }
  .nav-links li { width: 100%; }
  .nav-links a {
    display: block;
    padding: 0.9rem 2rem;
    font-size: 1rem;
    border-bottom: 1px solid var(--border);
  }
  .nav-links .nav-cta { margin: 1rem 2rem; border-radius: var(--radius); text-align: center; }
  .nav-hamburger { display: flex; }

  .hero-stats { gap: 1.5rem; }
  .stat-divider { display: none; }
  .services-grid { grid-template-columns: 1fr; }
  .footer-links { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .section-container { padding: 0 1.25rem; }
  .hero-container { padding: 4rem 1.25rem; }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .hero-actions .btn { justify-content: center; }
}