/* ===================================================================
   NEXIO TECH — CORE DESIGN SYSTEM
   Professional modern Vercel-inspired theme
 =================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500;600&display=swap');

:root {
  /* Color tokens - Vercel pitch black theme */
  --bg: #000000;
  --panel: #0a0a0a;
  --panel-raised: #121212;
  --line: rgba(255, 255, 255, 0.08);
  --line-bright: rgba(255, 255, 255, 0.16);

  --signal: #ffffff;       /* clean high-contrast white */
  --signal-dim: #a3a3a3;
  --pulse: #3b82f6;        /* blue accent for minor details */
  --pulse-dim: #1d4ed8;

  --text: #ffffff;
  --text-dim: #888888;
  --text-faint: #444444;

  --danger: #ef4444;
  --warn: #f59e0b;

  /* Type */
  --font-display: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Layout */
  --maxw: 1200px;
  --radius: 12px;
  --nav-h: 80px;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  position: relative;
}

/* Ambient dot-grid background texture (modern clean look) */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image: radial-gradient(rgba(255, 255, 255, 0.08) 1px, transparent 1px);
  background-size: 32px 32px;
  opacity: 0.7;
}

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 32px; position: relative; z-index: 1; }

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }
ul { list-style: none; }

/* Typography */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1.15;
}

h1 { font-size: clamp(2.6rem, 5.5vw, 4.2rem); font-weight: 700; }
h2 { font-size: clamp(2rem, 3.6vw, 2.8rem); font-weight: 700; }
h3 { font-size: clamp(1.3rem, 2vw, 1.6rem); }

p { color: var(--text-dim); }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-dim);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
}
.eyebrow::before {
  content: '';
  width: 6px; height: 6px;
  background: var(--text-dim);
  border-radius: 50%;
  opacity: 0.6;
}

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

/* ===== NAV ===== */
.nav {
  position: fixed; top: 0; left: 0; right: 0;
  height: var(--nav-h);
  z-index: 100;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  max-width: var(--maxw); margin: 0 auto; padding: 0 32px;
  height: 100%;
  display: flex; align-items: center; justify-content: space-between;
}
.nav-logo {
  font-family: var(--font-display); font-weight: 700; font-size: 1.15rem;
  display: flex; align-items: center; gap: 8px;
  color: var(--text);
  letter-spacing: -0.01em;
}
.nav-logo .node {
  width: 10px; height: 10px; background: #ffffff; border-radius: 2px;
}
.nav-logo .sub { color: var(--text-dim); font-weight: 400; font-size: 0.9rem; margin-left: 2px; }
.nav-links { display: flex; align-items: center; gap: 32px; }
.nav-links a {
  font-size: 0.88rem; color: var(--text-dim); font-weight: 500;
  transition: color 0.2s; position: relative;
}
.nav-links a:hover { color: var(--text); }
.nav-links a.active { color: #ffffff; font-weight: 600; }
.nav-cta {
  display: flex; align-items: center; gap: 16px;
}
.nav-toggle { display: none; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 24px;
  font-family: var(--font-body); font-weight: 500; font-size: 0.9rem;
  border-radius: 6px;
  border: 1px solid transparent;
  transition: all 0.2s ease;
  white-space: nowrap;
}
.btn-primary {
  background: #ffffff; color: #000000;
  border: 1px solid #ffffff;
}
.btn-primary:hover {
  background: transparent; color: #ffffff;
  border-color: #ffffff;
  transform: translateY(-1px);
}
.btn-ghost {
  background: transparent; color: var(--text); border-color: var(--line);
}
.btn-ghost:hover {
  border-color: rgba(255, 255, 255, 0.4);
  background: rgba(255, 255, 255, 0.05);
}
.btn-whatsapp {
  background: rgba(37, 211, 102, 0.1); color: #25D366; border: 1px solid rgba(37, 211, 102, 0.2);
}
.btn-whatsapp:hover { background: rgba(37, 211, 102, 0.18); border-color: #25D366; }
.btn-sm { padding: 8px 16px; font-size: 0.82rem; border-radius: 6px; }
.btn-block { width: 100%; justify-content: center; }

/* Panels / cards (clean flat designs) */
.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  position: relative;
  overflow: hidden;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.panel:hover {
  border-color: rgba(255, 255, 255, 0.16);
  box-shadow: 0 0 30px rgba(255, 255, 255, 0.03);
}

.panel-raised { background: var(--panel-raised); }

/* Section rhythm */
.section { padding: 120px 0; position: relative; }
.section-sm { padding: 80px 0; }
.section-head { max-width: 640px; margin-bottom: 64px; }
.section-head p { margin-top: 16px; font-size: 1.05rem; line-height: 1.6; }

.divider {
  height: 1px;
  background: var(--line);
  margin: 0;
}

/* Grid utilities */
.grid { display: grid; gap: 24px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* Footer */
.footer {
  border-top: 1px solid var(--line);
  padding: 80px 0 40px;
  position: relative;
  z-index: 1;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 48px;
}
.footer-brand p { margin-top: 14px; max-width: 280px; font-size: 0.92rem; line-height: 1.5; }
.footer-col h4 {
  font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--text-faint); margin-bottom: 18px; font-weight: 600;
}
.footer-col a, .footer-col span {
  display: block; color: var(--text-dim); font-size: 0.9rem; margin-bottom: 12px;
  transition: color 0.2s;
}
.footer-col a:hover { color: #ffffff; }
.footer-bottom {
  display: flex; justify-content: space-between; align-items: center;
  padding-top: 28px; border-top: 1px solid var(--line);
  font-size: 0.82rem; color: var(--text-faint);
  font-family: var(--font-mono);
}
.footer-bottom a { color: var(--text-faint); }
.footer-bottom a:hover { color: #ffffff; }

/* WhatsApp floating action button */
.wa-fab {
  position: fixed; bottom: 28px; right: 28px; z-index: 90;
  width: 58px; height: 58px;
  background: #1FBE5C;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 8px 24px rgba(31,190,92,0.3);
  transition: transform 0.2s, background-color 0.2s;
}
.wa-fab:hover { transform: scale(1.06); background-color: #1ebd5a; }
.wa-fab svg { width: 28px; height: 28px; }

/* Status pill */
.pill {
  display: inline-flex; align-items: center; gap: 6px;
  font-family: var(--font-mono); font-size: 0.72rem;
  padding: 5px 12px; border-radius: 20px;
  border: 1px solid var(--line);
  color: var(--text-dim);
}
.pill.on { color: #ffffff; border-color: rgba(255, 255, 255, 0.2); background: rgba(255, 255, 255, 0.05); }
.pill.on::before { content: ''; width: 6px; height: 6px; background: #10B981; border-radius: 50%; }

/* Bottom Navigation Bar (App-like down bar) */
.bottom-nav {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%) translateY(120px);
  width: calc(100% - 32px);
  max-width: 480px;
  height: 64px;
  background: rgba(10, 10, 10, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 32px;
  display: flex;
  justify-content: space-around;
  align-items: center;
  padding: 0 16px;
  z-index: 999;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.8), inset 0 1px 0 rgba(255, 255, 255, 0.1);
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.bottom-nav.visible {
  transform: translateX(-50%) translateY(0);
}

.bottom-nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--text-dim);
  font-size: 0.65rem;
  font-family: var(--font-body);
  font-weight: 500;
  text-decoration: none;
  gap: 4px;
  width: 60px;
  height: 100%;
  transition: color 0.2s ease, transform 0.2s ease;
}

.bottom-nav-item svg {
  width: 20px;
  height: 20px;
  stroke-width: 1.5;
  transition: transform 0.2s ease;
}

.bottom-nav-item:hover,
.bottom-nav-item.active {
  color: #ffffff;
}

.bottom-nav-item.active svg {
  transform: translateY(-2px);
  color: #ffffff;
  filter: drop-shadow(0 0 6px rgba(255, 255, 255, 0.4));
}

@media (min-width: 921px) {
  .bottom-nav {
    display: none !important;
  }
}

/* Mobile responsive styles */
@media (max-width: 920px) {
  body {
    padding-bottom: 90px; /* offset for mobile bottom nav bar */
  }
  .bottom-nav {
    transform: translateX(-50%) translateY(0); /* show bar on mobile */
  }
  .wa-fab {
    bottom: 96px !important;
    right: 20px !important;
    width: 52px !important;
    height: 52px !important;
  }
  .nav-links { position: fixed; top: var(--nav-h); left: 0; right: 0; bottom: 0;
    background: var(--bg); flex-direction: column; justify-content: flex-start;
    padding: 40px 32px; gap: 28px; transform: translateX(100%); transition: transform 0.3s ease;
    border-top: 1px solid var(--line);
    z-index: 99;
  }
  .nav-links.open { transform: translateX(0); }
  .nav-links a { font-size: 1.1rem; }
  .nav-toggle { display: flex; flex-direction: column; gap: 5px; background: none; border: none; z-index: 101; padding: 8px; }
  .nav-toggle span { width: 22px; height: 2px; background: var(--text); transition: 0.2s; }
  
  /* Menu icon animation when open */
  .nav-toggle.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
  .nav-toggle.open span:nth-child(2) { opacity: 0; }
  .nav-toggle.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .section { padding: 72px 0; }
  .wrap { padding: 0 20px; }
  .footer-bottom { flex-direction: column; gap: 12px; align-items: flex-start; }
}