/* =========================================================
   Todo en Uno Tecnología — Design tokens
   Paleta inspirada en placas de circuito: fibra de vidrio
   clara, cobre y tinta verde oscura. Tipografía técnica.
   ========================================================= */
:root {
  /* Color */
  --bg: #EEF2EA;          /* fibra de vidrio clara */
  --surface: #FFFFFF;
  --surface-2: #E3E9DE;
  --ink: #12201A;         /* verde-tinta casi negro */
  --ink-soft: #4C5C52;
  --copper: #B5651D;      /* traza de cobre */
  --copper-soft: #E8C9A8;
  --solder: #2F7A5C;      /* acento verde soldadura */
  --line: #C7D0C1;

  /* Type */
  --font-display: 'Space Grotesk', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;

  /* Layout */
  --max-w: 1120px;
  --radius: 10px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }

a {
  color: inherit;
  text-decoration: none;
}

.wrap {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--ink);
  color: var(--bg);
  padding: 10px 16px;
  z-index: 100;
}
.skip-link:focus { left: 12px; top: 12px; }

:focus-visible {
  outline: 2px solid var(--solder);
  outline-offset: 2px;
}

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.1;
  margin: 0 0 0.5em;
  letter-spacing: -0.01em;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--copper);
  margin: 0 0 0.6em;
}

p { margin: 0 0 1em; color: var(--ink-soft); }

/* ============ Buttons ============ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.65em 1.3em;
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 500;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease;
}
.btn:hover { transform: translateY(-1px); }

.btn-primary { background: var(--ink); color: var(--bg); }
.btn-primary:hover { background: var(--solder); }

.btn-ghost { border-color: var(--line); color: var(--ink); }
.btn-ghost:hover { border-color: var(--ink); }

.btn-outline { border-color: var(--ink); color: var(--ink); }
.btn-outline:hover { background: var(--ink); color: var(--bg); }

.btn-lg { padding: 0.85em 1.7em; font-size: 0.95rem; }

/* ============ Header ============ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(238, 242, 234, 0.9);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 24px;
  height: 72px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-right: auto;
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--ink);
}
.logo-mark { color: var(--copper); display: inline-flex; }
.logo-text em { font-style: normal; color: var(--copper); }

.main-nav ul {
  list-style: none;
  display: flex;
  gap: 28px;
  margin: 0;
  padding: 0;
}
.main-nav a {
  font-size: 0.92rem;
  color: var(--ink-soft);
}
.main-nav a:hover { color: var(--ink); }

.header-actions { display: flex; gap: 10px; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}
.nav-toggle span {
  width: 22px;
  height: 2px;
  background: var(--ink);
  display: block;
}

.mobile-nav ul {
  list-style: none;
  margin: 0;
  padding: 12px 24px 20px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  border-top: 1px solid var(--line);
}

/* ============ Hero ============ */
.hero {
  position: relative;
  overflow: hidden;
  padding: 96px 0 88px;
  border-bottom: 1px solid var(--line);
}

.hero-board {
  position: absolute;
  inset: 0;
  opacity: 0.55;
  pointer-events: none;
}
.board-svg { width: 100%; height: 100%; }
.trace {
  fill: none;
  stroke: var(--copper-soft);
  stroke-width: 2;
}
.node { fill: var(--copper); }

.hero-inner { position: relative; max-width: 760px; }

.hero h1 {
  font-size: clamp(2.2rem, 4.4vw, 3.6rem);
}
.hero h1 span { color: var(--solder); }

.hero-lead {
  font-size: 1.1rem;
  max-width: 52ch;
}

.hero-cta { display: flex; gap: 12px; margin-top: 8px; flex-wrap: wrap; }

/* ============ Sections ============ */
.section { padding: 88px 0; border-bottom: 1px solid var(--line); }
.section h2 { font-size: clamp(1.6rem, 2.6vw, 2.2rem); max-width: 24ch; }

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 40px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px;
}
.card-icon {
  width: 46px;
  height: 46px;
  border-radius: 8px;
  background: var(--surface-2);
  color: var(--solder);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}
.card h3 { font-size: 1.1rem; margin-bottom: 0.4em; }
.card p { margin: 0; font-size: 0.95rem; }

/* ============ Categories ============ */
.category-list {
  list-style: none;
  margin: 40px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}
.category-list a {
  display: block;
  padding: 16px 18px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  transition: border-color 0.15s ease, color 0.15s ease;
}
.category-list a:hover {
  border-color: var(--copper);
  color: var(--copper);
}

/* ============ About ============ */
.about-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 48px;
  align-items: start;
}
.stats {
  display: grid;
  gap: 20px;
  margin: 0;
}
.stats dt {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--copper);
}
.stats dd {
  margin: 4px 0 0;
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
}

/* ============ Contact ============ */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
}
.contact-list {
  list-style: none;
  padding: 0;
  margin: 20px 0 0;
  display: grid;
  gap: 14px;
}
.contact-list span {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  color: var(--ink-soft);
  letter-spacing: 0.06em;
}
.contact-list a { color: var(--solder); }

.contact-form {
  display: grid;
  gap: 16px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px;
}
.field { display: grid; gap: 6px; }
.field label {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--ink-soft);
}
.field input,
.field textarea {
  font-family: var(--font-body);
  font-size: 0.95rem;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--bg);
  color: var(--ink);
  resize: vertical;
}
.field input:focus,
.field textarea:focus {
  border-color: var(--solder);
}
.form-note {
  margin: 0;
  font-size: 0.85rem;
  color: var(--solder);
  min-height: 1.2em;
}

/* ============ Footer ============ */
.site-footer { padding: 32px 0; }
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}
.footer-inner p {
  margin: 0;
  font-size: 0.85rem;
  color: var(--ink-soft);
}
.footer-inner ul {
  list-style: none;
  display: flex;
  gap: 20px;
  margin: 0;
  padding: 0;
  font-size: 0.85rem;
}

/* ============ Responsive ============ */
@media (max-width: 860px) {
  .main-nav, .header-actions { display: none; }
  .nav-toggle { display: flex; }
  .grid-3, .about-grid, .contact-grid { grid-template-columns: 1fr; }
  .category-list { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 520px) {
  .category-list { grid-template-columns: 1fr; }
  .hero { padding: 72px 0 64px; }
}

/* ============ Reduced motion ============ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .btn { transition: none; }
}