/* ================================================
   XYZ — Sistema de diseño base
   Viviana Bautista
   ================================================ */

:root {
  --bg: #000000;
  --text: #ffffff;
  --text-muted: rgba(255, 255, 255, 0.7);
  --text-subtle: rgba(255, 255, 255, 0.4);
  --border: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(255, 255, 255, 0.22);

  /* Dimensiones */
  --constelaciones-bg: #040006;
  --constelaciones-accent: #7c3aed;
  --constelaciones-light: #a78bfa;

  --habitat-bg: #010d04;
  --habitat-accent: #166534;
  --habitat-light: #4ade80;

  --informatica-bg: #010810;
  --informatica-accent: #1e3a5f;
  --informatica-light: #60a5fa;

  --giranada-bg: #0e0000;
  --giranada-accent: #7f1d1d;
  --giranada-light: #f97316;

  /* Tipografía */
  --font-display: 'Cormorant Garamond', Georgia, serif;
  --font-body: 'Inter', system-ui, -apple-system, sans-serif;

  /* Espaciado */
  --s1: 0.5rem;
  --s2: 1rem;
  --s3: 1.5rem;
  --s4: 2rem;
  --s5: 3rem;
  --s6: 5rem;
  --s7: 8rem;

  --ease: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-weight: 300;
  font-size: 16px;
  line-height: 1.75;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

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

.container {
  max-width: 880px;
  margin: 0 auto;
  padding: 0 var(--s4);
}

.section-label {
  font-size: 0.63rem;
  font-weight: 400;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: var(--s4);
}

/* ─── Navegación ─── */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.4rem 2.2rem;
  transition: background var(--ease), border-color var(--ease);
}

.nav.scrolled {
  background: rgba(0, 0, 0, 0.9);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}

.nav-logo {
  font-family: var(--font-display);
  font-size: 1.45rem;
  letter-spacing: 0.2em;
  font-weight: 300;
  transition: opacity var(--ease);
}

.nav-logo:hover { opacity: 0.65; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 2.4rem;
}

.nav-link {
  font-size: 0.68rem;
  font-weight: 400;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-muted);
  transition: color var(--ease);
}

.nav-link:hover,
.nav-link.active { color: var(--text); }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 1px;
  background: var(--text);
  transition: transform var(--ease), opacity var(--ease);
}

.nav-toggle.active span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* ─── Footer ─── */

.footer {
  border-top: 1px solid var(--border);
  padding: var(--s5) 0;
  position: relative;
  z-index: 1;
  background: var(--bg);
}

.footer .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--s2);
}

.footer-xyz {
  font-family: var(--font-display);
  font-size: 1.3rem;
  letter-spacing: 0.12em;
  font-weight: 300;
}

.footer-copy {
  font-size: 0.7rem;
  color: var(--text-muted);
}

.footer-socials {
  display: flex;
  gap: var(--s3);
}

.footer-socials a {
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  transition: color var(--ease);
}

.footer-socials a:hover { color: var(--text); }

/* ─── Keyframes ─── */

@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ─── Responsive ─── */

@media (max-width: 768px) {
  .nav { padding: 1.2rem 1.4rem; }

  .nav-links {
    position: fixed;
    top: 0; right: -100%; bottom: 0;
    width: 72%;
    max-width: 280px;
    background: rgba(0, 0, 0, 0.97);
    border-left: 1px solid var(--border);
    flex-direction: column;
    justify-content: center;
    gap: 2rem;
    padding: 2rem;
    transition: right var(--ease);
    z-index: 99;
  }

  .nav-links.open { right: 0; }
  .nav-link { font-size: 0.85rem; }
  .nav-toggle { display: flex; z-index: 101; }

  .footer .container { flex-direction: column; align-items: flex-start; }
}