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

:root {
  --color-principal:    #e63946;
  --color-secundario:   #4cc9f0;
  --color-fondo:        #0d0f1a;
  --color-superficie:   #151825;
  --color-card:         #1c1f2e;
  --color-card-hover:   #232740;
  --color-borde:        #2a2d3e;
  --color-texto:        #e2e4ed;
  --color-texto-suave:  #8b90a8;
  --color-boton:        #e63946;
  --color-boton-hover:  #c1121f;
}

body {
  display: grid;
  grid-template-rows: auto auto 1fr auto;
  min-height: 100vh;
  font-family: "Segoe UI", Roboto, sans-serif;
  background-color: var(--color-fondo);
  color: var(--color-texto);
  line-height: 1.6;
}

/* ── Header ── */
header {
  background-color: #0a0c15;
  color: var(--color-texto);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.6);
  border-bottom: 1px solid var(--color-borde);
}

.top-bar {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  padding: 1.2rem 2rem;
  gap: 1rem;
}

.logo h1 {
  font-size: 2rem;
  color: var(--color-texto);
  letter-spacing: -0.5px;
}

.logo h1 span {
  color: var(--color-principal);
}

.logo p {
  font-size: 0.95rem;
  color: var(--color-texto-suave);
}

.auth-buttons {
  display: grid;
  grid-auto-flow: column;
  gap: 0.5rem;
}

.auth-buttons a {
  text-decoration: none;
  color: white;
  background-color: var(--color-boton);
  padding: 0.5rem 1.1rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.9rem;
  transition: background 0.2s, transform 0.15s;
}

.auth-buttons a:hover {
  background-color: var(--color-boton-hover);
  transform: translateY(-2px);
}

/* ── Nav ── */
nav {
  background-color: #11141f;
  border-top: 1px solid var(--color-borde);
}

nav ul {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: auto;
  justify-content: center;
  align-items: center;
  gap: 0.3rem;
  list-style: none;
  padding: 0.5rem 1rem;
}

nav a {
  color: var(--color-texto-suave);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.88rem;
  padding: 0.5rem 0.9rem;
  border-radius: 6px;
  letter-spacing: 0.3px;
  transition: background 0.2s, color 0.2s;
}

nav a:hover {
  background-color: var(--color-card);
  color: var(--color-secundario);
}

/* ── Main ── */
main {
  display: grid;
  gap: 2rem;
  justify-items: center;
  padding: 2rem;
}

/* ── Sections ── */
section {
  background-color: var(--color-superficie);
  padding: 2rem;
  max-width: 1000px;
  width: 90%;
  border-radius: 16px;
  border: 1px solid var(--color-borde);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
}

section h2 {
  color: var(--color-secundario);
  border-bottom: 2px solid var(--color-principal);
  display: inline-block;
  margin-bottom: 1rem;
  padding-bottom: 0.3rem;
  font-size: 1.4rem;
  letter-spacing: -0.3px;
}

section p {
  color: var(--color-texto-suave);
}

section a {
  color: var(--color-secundario);
}

section ul li {
  color: var(--color-texto-suave);
  margin-bottom: 0.3rem;
}

section ul li a {
  color: var(--color-secundario);
}

/* ── Servicios ── */
#servicios {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

#servicios h2 {
  grid-column: 1 / -1;
}

#servicios article {
  background-color: var(--color-card);
  border-left: 4px solid var(--color-principal);
  padding: 1.2rem;
  border-radius: 10px;
  border: 1px solid var(--color-borde);
  transition: transform 0.2s, background 0.2s;
}

#servicios article:hover {
  transform: translateY(-2px);
  background-color: var(--color-card-hover);
}

#servicios article h3 {
  color: var(--color-texto);
  margin-bottom: 0.5rem;
  font-size: 1rem;
}

#servicios article p {
  font-size: 0.9rem;
}

/* ── Imágenes ── */
section img {
  display: block;
  margin: 1.2rem auto;
  max-width: 100%;
  height: auto;
  border-radius: 12px;
  border: 1px solid var(--color-borde);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.5);
}

/* ── Footer ── */
footer {
  display: grid;
  place-items: center;
  background-color: #0a0c15;
  color: var(--color-texto-suave);
  text-align: center;
  padding: 1.5rem;
  margin-top: 1rem;
  border-top: 1px solid var(--color-borde);
  font-size: 0.9rem;
}

/* ── Bootstrap overrides ── */
.btn-primary {
  background-color: var(--color-principal) !important;
  border-color: var(--color-principal) !important;
}

.btn-primary:hover {
  background-color: var(--color-boton-hover) !important;
}

/* ── Responsive ── */
@media (max-width: 1024px) {
  .top-bar { grid-template-columns: 1fr; text-align: center; }
  .auth-buttons { justify-content: center; margin-top: 0.8rem; }
  .logo h1 { font-size: 1.8rem; }
  main { padding: 1.5rem; }
}

@media (max-width: 768px) {
  .top-bar { padding: 1rem 1.5rem; }
  .logo h1 { font-size: 1.6rem; }
  nav ul { gap: 0.2rem; }
  nav a { font-size: 0.8rem; padding: 0.4rem 0.6rem; }
  section { padding: 1.5rem; width: 100%; }
}

@media (max-width: 480px) {
  header { text-align: center; }
  .top-bar { display: flex; flex-direction: column; align-items: center; padding: 1rem; }
  .logo h1 { font-size: 1.3rem; }
  .auth-buttons { display: flex; flex-direction: column; align-items: center; width: 100%; gap: 0.5rem; }
  .auth-buttons a { width: 80%; text-align: center; }
  nav ul { flex-wrap: wrap; display: flex; justify-content: center; }
  section { width: 100%; padding: 1.2rem; }
}