:root {
  --accent: #16599b;
  --accent-2: #42c0ef;
  --orange: #e45d1d;
  --dark: #0f1724;
  --muted: #6b7280;
  --card: #ffffff;
  --glass: rgba(255, 255, 255, 0.06);
  --maxw: 1200px;
  --radius: 14px;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI",
    Roboto, "Helvetica Neue", Arial;
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  background: linear-gradient(180deg, #f7fbff 0%, #ffffff 100%);
  color: var(--dark);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  line-height: 1.5;
}

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

header {
  position: sticky;
  top: 0;
  backdrop-filter: blur(6px);
  background: rgba(255, 255, 255, 0.6);
  z-index: 50;
  border-bottom: 1px solid rgba(15, 23, 36, 0.04);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 5px;
  padding: 12px 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo {
  height: 80px;
  width: auto;
  display: block;
  margin-left: 15px;
}

nav ul {
  display: flex;
  gap: 18px;
  list-style: none;
  margin: 0;
  padding: 0;
}

nav a {
  color: var(--dark);
  text-decoration: none;
  font-weight: 600;
}

.hero {
  display: grid;
  grid-template-columns: 1fr 420px;
  gap: 32px;
  align-items: center;
  padding: 48px 0;
}

.hero h1 {
  font-size: 34px;
  margin: 0 0 12px;
}

.hero p.lead {
  color: var(--muted);
  margin: 0 0 20px;
}

.ctas {
  display: flex;
  gap: 12px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 18px;
  border-radius: 10px;
  border: 0;
  font-weight: 600;
  cursor: pointer;
}

.btn-primary {
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  color: white;
  box-shadow: 0 8px 24px rgba(22, 89, 155, 0.12);
}

.btn-ghost {
  background: transparent;
  border: 1px solid rgba(15, 23, 36, 0.06);
  color: var(--dark);
}

.card {
  background: var(--card);
  border-radius: 16px;
  padding: 18px;
  box-shadow: 0 6px 20px rgba(12, 18, 32, 0.06);
}

/* Services grid */
.services {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin: 28px 0;
}

.service {
  padding: 18px;
  border-radius: 12px;
  background: linear-gradient(180deg,
      rgba(22, 89, 155, 0.04),
      transparent);
}

.service h3 {
  margin: 10px 0 6px;
}

.service p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

/* Methodology */
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin: 16px 0;
}

.step {
  background: linear-gradient(180deg, #fff, #fbfdff);
  padding: 14px;
  border-radius: 12px;
  border: 1px solid rgba(22, 89, 155, 0.06);
}

.clients {
  display: flex;
  align-items: center;
  gap: 12px;
  overflow: hidden;
  padding: 10px 0;
}

.client {
  min-width: 160px;
  height: 64px;
  border-radius: 8px;
  background: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(15, 23, 36, 0.04);
  font-weight: 700;
  color: var(--muted);
}

#clients-track > div.client.colsoft {
  background: linear-gradient(180deg, rgba(66, 192, 239));
  border: none;
  color: var(--accent-2);
}

.client img {
  max-height: 70px;
  object-fit: contain;
}

/* Contact & footer */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: 18px;
  margin: 28px 0;
}

.form-row {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 10px;
}

input,
textarea {
  padding: 10px;
  border-radius: 8px;
  border: 1px solid rgba(15, 23, 36, 0.08);
  font-size: 14px;
}

textarea {
  min-height: 120px;
  resize: vertical;
}

footer {
  padding: 28px 0;
  color: var(--muted);
  font-size: 14px;
  border-top: 1px solid rgba(15, 23, 36, 0.04);
}

.badge {
  display: inline-flex;
  padding: 6px 10px;
  border-radius: 999px;
  background: rgba(66, 192, 239, 0.12);
  color: var(--accent-2);
  font-weight: 700;
  font-size: 13px;
}

.feature-list {
  display: grid;
  gap: 10px;
}

.feature-item {
  display: flex;
  gap: 12px;
  align-items: flex-start;
}

.feature-item svg {
  margin-top: 4px;
}

/* Responsive */
@media (max-width: 980px) {
  .hero {
    grid-template-columns: 1fr;
    padding: 32px 0;
  }

  .services {
    grid-template-columns: repeat(2, 1fr);
  }

  .steps {
    grid-template-columns: repeat(2, 1fr);
  }

  /* Contact: stack columns on tablet/mobile */
  .contact-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .container { padding: 16px; }
  nav ul {
    display: none;
  }

  .mobile-menu-btn {
    display: inline-flex;
  }

  .logo {
    height: 48px; /* reduce para evitar desajustes en header móvil */
    margin-left: 5px;
  }

  /* Compactar la barra superior en móvil */
  .nav {
    gap: 8px;
  }

  /* Ensure hamburger button shows on small screens (override late in cascade) */
  @media (max-width: 640px) {
    .mobile-menu-btn { display: inline-flex !important; align-items: center; justify-content: center; }
  }
  .nav > div:last-child {
    display: inline-flex;
    gap: 6px;
  }

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

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

  .clients {
    gap: 8px;
  }

  header .container {
    padding: 12px;
  }

  /* Botón de tema más compacto en móvil */
  .theme-toggle {
    padding: 6px 8px;
    border-radius: 8px;
  }
  .theme-toggle .muted { display: none; }

  /* Reducir padding de botones para caber en una sola línea */
  .btn { padding: 10px 12px; font-size: 14px; }

  /* Hero tweaks */
  .hero { gap: 20px; }
  .hero h1 { font-size: 28px; line-height: 1.2; }
  .hero p.lead { font-size: 15px; }
  .ctas { flex-wrap: wrap; }

  /* Mobile menu links styling */
  .mobile-menu { margin-top: 8px; }
  .mobile-menu a {
    display: block;
    padding: 12px 0;
    color: var(--dark);
    text-decoration: none;
    border-bottom: 1px solid rgba(15, 23, 36, 0.06);
  }
  .mobile-menu a:last-child { border-bottom: 0; }

  #clients-track > div.client.colsoft img {
    max-height: 30px;
  }
}

/* En pantallas muy pequeñas, ocultar CTA para evitar desbordes */
@media (max-width: 480px) {
  .nav > div:last-child .btn-primary { display: none; }
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: 0;
  cursor: pointer;
  color: var(--dark);
}
.mobile-menu-btn svg { transition: transform .2s ease; }
.mobile-menu-btn.is-open svg { transform: rotate(90deg); }

.mobile-menu {
  display: none;
  padding: 16px;
}

.show {
  display: block;
}

/* Lock scroll when mobile menu is open */
.menu-open { overflow: hidden; }

/* small helper */
.muted {
  color: var(--muted);
}

/* ===== Dark mode support ===== */
/* Base dark palette via data-theme or OS preference */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --dark: #e5e7eb; /* text on dark */
    --muted: #9aa3b2;
    --card: #111827; /* near-slate-900 */
    --bg-1: #0b1220; /* page background */
    --border: rgba(255,255,255,0.08);
  }
}

/* Explicit dark theme */
[data-theme="dark"] {
  --dark: #e5e7eb;
  --muted: #9aa3b2;
  --card: #111827;
  --bg-1: #0b1220;
  --border: rgba(255,255,255,0.08);
}

[data-theme="dark"] body {
  background: radial-gradient(1200px 600px at 50% -200px, rgba(22,89,155,0.15), transparent 40%), linear-gradient(180deg, #0b1220 0%, #0b1220 100%);
  color: var(--dark);
}

[data-theme="dark"] header {
  background: rgba(11, 18, 32, 0.6);
  border-bottom: 1px solid var(--border);
}
[data-theme="dark"] .mobile-menu-btn { color: var(--dark); }

[data-theme="dark"] .card { box-shadow: 0 10px 28px rgba(0,0,0,0.35); }
[data-theme="dark"] nav a { color: var(--dark); }
[data-theme="dark"] .btn-ghost { border-color: var(--border); color: var(--dark); }
[data-theme="dark"] .service { background: linear-gradient(180deg, rgba(66, 192, 239, 0.06), transparent); }
[data-theme="dark"] .step { background: linear-gradient(180deg, #0e1726, #0a1320); border: 1px solid var(--border); }
[data-theme="dark"] .clients .client { background: #0e1726; border: 1px solid var(--border); color: var(--muted); }
[data-theme="dark"] .badge { background: rgba(66, 192, 239, 0.18); color: #7fd8fb; }
[data-theme="dark"] footer { border-top: 1px solid var(--border); }

/* Inputs */
[data-theme="dark"] input,
[data-theme="dark"] textarea {
  background: #0e1726;
  color: var(--dark);
  border: 1px solid var(--border);
}
input::placeholder,
textarea::placeholder { color: #9aa3b2; }
[data-theme="dark"] .btn-primary { box-shadow: 0 10px 24px rgba(66, 192, 239, 0.18); }

/* System preference (auto-dark) when user didn't force light */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) body {
    background: radial-gradient(1200px 600px at 50% -200px, rgba(22,89,155,0.15), transparent 40%), linear-gradient(180deg, #0b1220 0%, #0b1220 100%);
    color: var(--dark);
  }
  :root:not([data-theme="light"]) header { background: rgba(11, 18, 32, 0.6); border-bottom: 1px solid var(--border); }
  :root:not([data-theme="light"]) .card { box-shadow: 0 10px 28px rgba(0,0,0,0.35); }
  :root:not([data-theme="light"]) nav a { color: var(--dark); }
  :root:not([data-theme="light"]) .btn-ghost { border-color: var(--border); color: var(--dark); }
  :root:not([data-theme="light"]) .service { background: linear-gradient(180deg, rgba(66, 192, 239, 0.06), transparent); }
  :root:not([data-theme="light"]) .step { background: linear-gradient(180deg, #0e1726, #0a1320); border: 1px solid var(--border); }
  :root:not([data-theme="light"]) .clients .client { background: #0e1726; border: 1px solid var(--border); color: var(--muted); }
  :root:not([data-theme="light"]) .badge { background: rgba(66, 192, 239, 0.18); color: #7fd8fb; }
  :root:not([data-theme="light"]) footer { border-top: 1px solid var(--border); }
  :root:not([data-theme="light"]) input,
  :root:not([data-theme="light"]) textarea { background: #0e1726; color: var(--dark); border: 1px solid var(--border); }
  :root:not([data-theme="light"]) .btn-primary { box-shadow: 0 10px 24px rgba(66, 192, 239, 0.18); }
}

/* Theme toggle button */
.theme-toggle {
  background: transparent;
  border: 1px solid rgba(15, 23, 36, 0.12);
  color: var(--dark);
  border-radius: 10px;
  padding: 8px 10px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
}
[data-theme="dark"] .theme-toggle { border-color: var(--border); color: var(--dark); }

/* Overlay mobile menu to avoid content shift */
@media (max-width: 640px) {
  header { --header-h: 72px; }
  .mobile-menu {
    position: fixed;
    top: var(--header-h, 72px);
    left: 0;
    right: 0;
    width: 100vw;
    max-height: calc(100vh - var(--header-h, 72px));
    overflow-y: auto;
    margin-top: 0; /* override earlier margin */
    z-index: 40; /* below header (z 50), above content */
    box-shadow: 0 12px 24px rgba(0,0,0,0.12);
  }
}