/* css/main.css — Abecedario de Anuros */

@import url('https://fonts.googleapis.com/css2?family=EB+Garamond:ital,wght@0,400;0,500;0,700;1,400&family=Libre+Baskerville:ital,wght@0,400;0,700;1,400&display=swap');

/* ── Variables ─────────────────────────────────────────────────── */
:root {
  --bg:              #0D0F0A;
  --bg2:             #141810;
  --surface:         #1C2116;
  --surface2:        #222818;
  --border:          rgba(255,255,255,0.07);
  --border-hover:    rgba(255,255,255,0.15);
  --text:            #EAE8E0;
  --text-muted:      rgba(234,232,224,0.48);
  --text-faint:      rgba(234,232,224,0.25);
  --accent:          #7CBA5A;
  --accent2:         #B5D98A;
  --accent-dim:      rgba(124,186,90,0.12);

  /* Fondo crema para ilustraciones */
  --ilustracion-bg:  #F5F0E8;
  --ilustracion-bg2: #EDE6D6;

  --serif:           'EB Garamond', Georgia, serif;
  --ui:              'Libre Baskerville', serif;
  --radius:          4px;
  --radius-lg:       8px;
  --transition:      0.28s cubic-bezier(0.4, 0, 0.2, 1);
  --shadow:          0 8px 32px rgba(0,0,0,0.45);
}

/* ── Reset ─────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--serif);
  font-size: clamp(16px, 1.1vw, 18px);
  line-height: 1.7;
  min-height: 100vh;
  overflow-x: hidden;
}

/* Grain overlay sutil */
body::before {
  content: '';
  position: fixed; inset: 0; z-index: 9999;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.03'/%3E%3C/svg%3E");
  pointer-events: none; opacity: 0.5;
}

/* ── Tipografía ─────────────────────────────────────────────────── */
h1, h2, h3 { line-height: 1.2; font-weight: 400; }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

/* ── Header ─────────────────────────────────────────────────────── */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(13,15,10,0.88);
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  border-bottom: 1px solid var(--border);
  padding: 0.9rem 2rem;
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
}
.site-logo {
  font-family: var(--serif);
  font-size: clamp(1rem, 2vw, 1.2rem);
  letter-spacing: 0.03em;
  color: var(--accent2);
}
.site-logo span { color: var(--text-muted); font-size: 0.82em; }

.site-nav { display: flex; gap: 0.25rem; flex-wrap: wrap; }
.site-nav a {
  font-family: var(--ui); font-size: 0.72rem;
  letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--text-muted); padding: 0.35rem 0.7rem;
  border-radius: var(--radius);
  transition: color var(--transition), background var(--transition);
}
.site-nav a:hover { color: var(--text); background: var(--surface); }

/* ── Hero ───────────────────────────────────────────────────────── */
.hero {
  min-height: 72vh; display: grid; place-items: center;
  text-align: center; padding: 6rem 2rem 4rem;
  position: relative; overflow: hidden;
}
.hero-bg-letter {
  position: absolute; font-family: var(--serif);
  font-size: clamp(180px, 34vw, 460px);
  color: rgba(124,186,90,0.035);
  letter-spacing: -0.05em; user-select: none; pointer-events: none;
  top: 50%; left: 50%; transform: translate(-50%,-50%); white-space: nowrap;
}
.hero-content { position: relative; z-index: 1; max-width: 700px; }
.hero-label {
  font-family: var(--ui); font-size: 0.68rem;
  letter-spacing: 0.2em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 1.5rem;
  display: flex; align-items: center; justify-content: center; gap: 0.75rem;
}
.hero-label::before, .hero-label::after {
  content: ''; display: block; width: 36px; height: 1px;
  background: var(--accent); opacity: 0.5;
}
.hero h1 {
  font-size: clamp(2.4rem, 7vw, 5.5rem);
  letter-spacing: -0.02em; margin-bottom: 1rem;
}
.hero h1 em { font-style: italic; color: var(--accent2); }
.hero-desc {
  font-size: clamp(0.95rem, 1.4vw, 1.15rem);
  color: var(--text-muted); max-width: 520px; margin: 0 auto 2.5rem; line-height: 1.85;
}
.hero-cta {
  display: inline-block;
  font-family: var(--ui); font-size: 0.72rem;
  letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--accent); border: 1px solid var(--accent);
  padding: 0.85rem 2.2rem; border-radius: var(--radius);
  transition: background var(--transition), color var(--transition);
}
.hero-cta:hover { background: var(--accent-dim); }

/* ── Filter bar ─────────────────────────────────────────────────── */
.filter-bar {
  display: flex; gap: 0.45rem; flex-wrap: wrap;
  justify-content: center; padding: 2rem 2rem 0;
}
.filter-btn {
  font-family: var(--ui); font-size: 0.68rem;
  letter-spacing: 0.1em; text-transform: uppercase;
  padding: 0.45rem 1.1rem;
  border: 1px solid var(--border); border-radius: 100px;
  background: transparent; color: var(--text-muted);
  cursor: pointer; transition: all var(--transition);
}
.filter-btn:hover, .filter-btn.active {
  border-color: var(--accent); color: var(--accent);
  background: var(--accent-dim);
}

/* ── Alphabet grid ──────────────────────────────────────────────── */
.alphabet-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(240px, 100%), 1fr));
  gap: 1.5px; padding: 2rem;
  max-width: 1600px; margin: 0 auto;
}

/* ── Rana card ──────────────────────────────────────────────────── */
.rana-card {
  position: relative; background: var(--surface);
  overflow: hidden; cursor: pointer;
  aspect-ratio: 3/4;
  display: flex; flex-direction: column;
  transition: transform var(--transition), box-shadow var(--transition);
}
.rana-card:hover   { z-index: 2; transform: scale(1.025); box-shadow: var(--shadow); }
.rana-card:hover .card-overlay { opacity: 1; }
.rana-card:hover .card-frog    { transform: scale(1.07) translateY(-5px); }

.card-letter-bg {
  position: absolute; bottom: -0.1em; right: -0.05em;
  font-size: 8em; font-family: var(--serif);
  color: rgba(255,255,255,0.035); line-height: 1;
  user-select: none; pointer-events: none;
}

/* Zona de la ilustración — fondo crema suave */
.card-frog {
  flex: 1; display: flex; align-items: center; justify-content: center;
  padding: 1.5rem 1.5rem 0;
  background: var(--ilustracion-bg);
  transition: transform var(--transition);
  position: relative;
}
.card-frog::after {
  /* degradado crema→surface para transición suave */
  content: ''; position: absolute; bottom: 0; left: 0; right: 0;
  height: 40px;
  background: linear-gradient(to bottom, transparent, var(--surface));
  pointer-events: none;
}
.card-frog img {
  max-height: 155px; object-fit: contain;
  filter: drop-shadow(0 6px 18px rgba(0,0,0,0.2));
}
.card-frog .placeholder-frog {
  width: 90px; height: 90px; border-radius: 50%;
  display: grid; place-items: center;
  font-size: 2.2rem; opacity: 0.2;
}

.card-info {
  padding: 0.9rem 1.1rem 1.1rem; position: relative; z-index: 1;
}
.card-letra {
  font-size: 0.62rem; font-family: var(--ui);
  letter-spacing: 0.15em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 0.25rem;
}
.card-nombre-comun {
  font-size: clamp(0.88rem, 1.1vw, 1rem); font-weight: 500;
  margin-bottom: 0.18rem; line-height: 1.3;
}
.card-nombre-cientifico {
  font-size: 0.75rem; font-style: italic;
  color: var(--text-muted); margin-bottom: 0.45rem;
}
.card-iucn {
  display: inline-block; font-family: var(--ui);
  font-size: 0.6rem; letter-spacing: 0.12em; text-transform: uppercase;
  padding: 0.15rem 0.5rem; border-radius: 2px; font-weight: 700; color: #fff;
}
.card-tipografia {
  font-size: 0.62rem; color: var(--text-faint);
  margin-top: 0.3rem; font-family: var(--ui);
}
.card-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(to bottom, transparent 35%, rgba(0,0,0,0.55));
  opacity: 0; transition: opacity var(--transition); pointer-events: none;
}

/* ── About section ──────────────────────────────────────────────── */
.about-section {
  max-width: 840px; margin: 0 auto;
  padding: 4rem 2rem 6rem;
  display: grid; grid-template-columns: 1fr 1fr; gap: 4rem;
}
@media (max-width: 640px) { .about-section { grid-template-columns: 1fr; gap: 2rem; } }
.about-section h2 {
  font-size: clamp(1.15rem, 2.4vw, 1.75rem);
  margin-bottom: 1rem; font-style: italic;
}
.about-section p { color: var(--text-muted); line-height: 1.9; font-size: 0.93rem; }

/* ── Footer ─────────────────────────────────────────────────────── */
.site-footer {
  border-top: 1px solid var(--border); padding: 1.75rem 2rem;
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; flex-wrap: wrap;
}
.footer-copy { font-size: 0.72rem; color: var(--text-muted); font-family: var(--ui); }
.admin-trigger {
  background: none; border: none;
  color: rgba(255,255,255,0.08); cursor: pointer;
  font-size: 1.1rem; padding: 0.5rem;
  transition: color var(--transition);
}
.admin-trigger:hover { color: rgba(255,255,255,0.25); }

/* ── Loading ─────────────────────────────────────────────────────── */
.loading-grid {
  padding: 4rem; text-align: center;
  color: var(--text-muted); font-style: italic;
}
.spinner {
  display: inline-block; width: 22px; height: 22px;
  border: 2px solid var(--border); border-top-color: var(--accent);
  border-radius: 50%; animation: spin 0.8s linear infinite; margin-bottom: 1rem;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Responsive ─────────────────────────────────────────────────── */
@media (max-width: 768px) {
  .site-header { padding: 0.75rem 1rem; }
  .alphabet-grid { padding: 1rem; gap: 1px; }
  .hero { padding: 4rem 1.5rem 3rem; }
}

/* ── Animations ─────────────────────────────────────────────────── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(14px); }
  to   { opacity: 1; transform: translateY(0); }
}
.fade-up { animation: fadeUp 0.5s ease both; }
.fade-up:nth-child(2)  { animation-delay: 0.04s; }
.fade-up:nth-child(3)  { animation-delay: 0.08s; }
.fade-up:nth-child(4)  { animation-delay: 0.12s; }
.fade-up:nth-child(5)  { animation-delay: 0.16s; }
.fade-up:nth-child(6)  { animation-delay: 0.20s; }