:root {
  --azul: #1F2D54;
  --azul-osc: #12203a;
  --gold: #f89803;
  --verde: #2ecc71;
}

/* =========================================================
   🎨 RESETEO Y BASE
========================================================= */
* {
  box-sizing: border-box;
  font-family: 'Inter', system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  margin: 0;
  padding: 0;
}

body {
  background: linear-gradient(180deg, #12213a 0%, #0f2a4a 100%);
  color: #fff;
  overflow-x: hidden;
  padding-top: 90px; /* espacio para el header fijo */
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* =========================================================
   🧭 HEADER FLOTANTE
========================================================= */
/* =========================================================
   🧭 HEADER FLOTANTE
========================================================= */
.site-header {
  position: fixed;
  top: 0; left: 0;
  width: 100%;
  z-index: 2000;
  background: rgba(31, 45, 84, 0.95);
  backdrop-filter: blur(6px);
  color: #fff;
  box-shadow: 0 2px 10px rgba(0,0,0,.15);
  transition: all 0.3s ease;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  max-width: 1100px;
  margin: 0 auto;
}

/* Logo */
.logo { display: flex; align-items: center; margin-right: auto; }
.logo a { display: flex; align-items: center; text-decoration: none; }
.logo-img {
  height: 72px;
  width: auto;
  display: block;
  transition: all 0.3s ease;
  filter: drop-shadow(0 3px 4px rgba(0,0,0,.4));
}
.logo-img:hover { transform: scale(1.05); }

/* Navegación */
.nav {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 14px;
  margin-left: auto;
}

.nav-item {
  font-size: 1rem;
  font-weight: 700;
  color: #fff;
  background-color: var(--gold);
  padding: 8px 18px;
  border-radius: 20px;
  transition: all 0.25s ease;
  white-space: nowrap;
  box-shadow: 0 3px 6px rgba(0,0,0,.25);
  text-decoration: none;
}

.nav-item:hover {
  background-color: #ff9d00;
  transform: translateY(-1px);
  opacity: 1;
}

/* =========================================================
   🦸‍♂️ SECCIÓN HERO
========================================================= */
.hero {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(180deg, #1f2d54 0%, #12203a 100%);
  padding: 60px 20px;
}

.hero-flex {
  display: grid;
  grid-template-columns: minmax(240px, 1fr) minmax(380px, 500px);
  align-items: center;
  justify-content: center;
  column-gap: 40px;
}

.hero-img-col { display: flex; justify-content: flex-end; }
.hero-img {
  width: clamp(180px, 28vw, 310px);
  height: auto;
  filter: drop-shadow(0 5px 15px rgba(0,0,0,0.4));
  transition: transform .4s ease;
}
.hero-img:hover { transform: translateY(-5px); }

.hero-text-col { display: flex; flex-direction: column; align-items: flex-start; }

/* Textos */
h1 { font-size: clamp(1.5rem, 2.5vw, 2.2rem); margin-bottom: 12px; font-weight: 800; }
p { color: #dfe9f7; line-height: 1.6; font-size: 1.05rem; margin-bottom: 20px; }

/* =========================================================
   📄 FORMULARIO DE BÚSQUEDA
========================================================= */
.search-form {
  display: flex;
  flex-direction: column;
  gap: 12px;
  width: 100%;
  max-width: 420px;
}

.search-form label { font-size: 0.9rem; font-weight: 600; color: #bcd1ff; margin-bottom: 2px; }

.search-form input {
  padding: 12px;
  border-radius: 8px;
  border: 1px solid rgba(255,255,255,0.1);
  background: rgba(255,255,255,0.07);
  color: #fff;
  font-size: 1rem;
  width: 100%;
  transition: border-color 0.3s;
}
.search-form input:focus { border-color: var(--gold); outline: none; background: rgba(255,255,255,0.1); }

/* Fila Serie-Número */
.row-serie-numero { display: flex; gap: 16px; margin-bottom: 4px; }
.row-serie-numero .col { flex: 1; }

/* Captcha */
.captcha-line { display: flex; align-items: center; gap: 12px; margin: 4px 0; }
.captcha-box { background: #fff; padding: 6px; border-radius: 8px; display: flex; align-items: center; }
#captcha-img { display: block; border-radius: 4px; }
#captcha { letter-spacing: 1px; }

/* Botones */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  border-radius: 10px;
  background: var(--gold);
  color: #fff;
  border: none;
  font-weight: 800;
  cursor: pointer;
  box-shadow: 0 4px 14px rgba(248,152,3,0.3);
  transition: all .25s ease;
  font-size: 1rem;
}
.btn:hover:not([disabled]) { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(248,152,3,0.4); }
.btn:active:not([disabled]) { transform: translateY(0); }
.btn[disabled] { opacity: 0.5; cursor: not-allowed; filter: grayscale(0.5); }

.btn-secondary { background: rgba(255,255,255,0.1); color: #fff; box-shadow: none; border: 1px solid rgba(255,255,255,0.2); }
.btn-secondary:hover { background: rgba(255,255,255,0.15); }

/* Alertas */
.alert {
  padding: 12px 16px;
  border-radius: 8px;
  margin-top: 16px;
  font-size: 0.95rem;
  display: none;
}
.alert.info { background: rgba(31, 45, 84, 0.6); border-left: 4px solid #3757ff; }
.alert.error { background: rgba(231, 76, 60, 0.2); border-left: 4px solid #e74c3c; color: #ffb3b3; }
.alert.success { background: rgba(46, 204, 113, 0.2); border-left: 4px solid #2ecc71; color: #b3ffcc; }

/* Resultados */
.result {
  margin-top: 24px;
  padding: 20px;
  background: rgba(255,255,255,0.05);
  border-radius: 12px;
  border: 1px solid rgba(255,255,255,0.1);
  text-align: center;
  display: none;
}
.result h3 { margin-bottom: 8px; font-size: 1.2rem; }
#found-text { margin-bottom: 16px; color: #bcd1ff; }
#acciones { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; }

/* =========================================================
   ⚙️ FOOTER
========================================================= */
.footer {
  padding: 24px 0;
  text-align: center;
  color: #cbd9ff;
  font-size: 0.9rem;
  background: rgba(31, 45, 84, 0.98);
  border-top: 1px solid rgba(255,255,255,0.05);
}

/* =========================================================
   📱 RESPONSIVIDAD
========================================================= */
@media (max-width: 992px) {
  .hero-flex { grid-template-columns: 1fr; text-align: center; gap: 30px; }
  .hero-img-col { justify-content: center; }
  .hero-text-col { align-items: center; }
  .hero-img { width: clamp(160px, 30vw, 240px); }
  h1 { font-size: 1.8rem; }
}

@media (max-width: 600px) {
  body { padding-top: 80px; }
  .site-header .container { flex-direction: row; }
  .logo-img { height: 60px; }
  .nav-item { padding: 6px 14px; font-size: 0.9rem; }
  .row-serie-numero { flex-direction: column; gap: 12px; }
  .captcha-line { flex-direction: column; align-items: stretch; }
  .btn { width: 100%; }
  #acciones { flex-direction: column; }
}