:root {
  --bs-primary: #4d586a;
  --bs-primary-rgb: 77, 88, 106;
  --bs-secondary: #646f81;
  --bs-secondary-rgb: 100, 111, 129;
  --bs-dark: #2a2e38;
  --bs-dark-rgb: 42, 46, 56;
  --bs-info: #5a8de1;
  --bs-info-rgb: 90, 141, 225;

  --color-primary: #4d586a;
  --color-primary-dark: #3d4654;
  --color-secondary: #646f81;
  --color-secondary-dark: #545c6b;
  --color-dark: #2a2e38;
  --color-light: #f8f9fa;
}

body {
  background-image: url("../img/detalles-en-blanco-y-negro-del-concepto-de-textura-lunar 1920x1280.webp");
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
  background-repeat: no-repeat;
  min-height: 100vh;
  padding: 20px 0;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  position: relative;
}

body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(26, 26, 46, 0.5);
  z-index: -1;
}

body.loading {
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
}

body.loading::before {
  display: none;
}

.container {
  position: relative;
  z-index: 1;
}

/* ===== FIELDSETS Y LEGENDS ===== */

fieldset {
  border: none;
  padding: 0;
  margin: 0;
}

legend {
  padding: 0;
  margin-bottom: 0.5rem;
  color: var(--color-dark);
  font-weight: 600;
}

/* ===== CARDS ===== */

.card {
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
  margin-bottom: 20px;
  border: none;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(10px);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 12px rgba(0, 0, 0, 0.4);
}

.card-header {
  font-weight: 600;
  border-bottom: 2px solid rgba(0, 0, 0, 0.1);
}

.card.bg-dark {
  background-color: var(--color-dark);
}

.card.bg-dark .card-body {
  background-color: var(--color-dark);
}

.card.bg-dark .alert-info {
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: var(--color-light);
}

.card .card-header.bg-primary {
  background: linear-gradient(
    135deg,
    var(--color-primary),
    var(--color-primary-dark)
  );
}

.card .card-header.bg-secondary {
  background: linear-gradient(
    135deg,
    var(--color-secondary),
    var(--color-secondary-dark)
  );
}

.card .card-header.bg-info {
  background: linear-gradient(135deg, #5a8de1, #4a7bd6);
}

.card .card-header.bg-dark {
  background: linear-gradient(135deg, var(--color-dark), #1a1d23);
}

/* ===== ANIMACIONES ===== */

@keyframes bounce {
  0%,
  100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.1);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.emoji-result {
  font-size: 80px;
  animation: bounce 0.5s ease;
  filter: drop-shadow(2px 2px 4px rgba(0, 0, 0, 0.5));
}

#resultadoCard,
#salidaCard {
  animation: fadeIn 0.4s ease;
}

/* ===== BOTONES ===== */

.btn {
  font-weight: 500;
  padding: 0.5rem 1.25rem;
  transition: all 0.3s ease;
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.btn:active {
  transform: translateY(0);
}

.btn.btn-primary {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn.btn-primary:hover {
  background-color: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
}

.btn-group .btn {
  transition: all 0.3s ease;
}

.btn-outline-primary {
  --bs-btn-color: var(--color-primary);
  --bs-btn-border-color: var(--color-primary);
  --bs-btn-hover-color: #fff;
  --bs-btn-hover-bg: var(--color-primary);
  --bs-btn-hover-border-color: var(--color-primary);
  --bs-btn-focus-shadow-rgb: 77, 88, 106;
  --bs-btn-active-color: #fff;
  --bs-btn-active-bg: var(--color-primary);
  --bs-btn-active-border-color: var(--color-primary);
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn-outline-primary:hover,
.btn-check:checked + .btn-outline-primary,
.btn-check:active + .btn-outline-primary {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: white;
}

.btn-check:checked + .btn-outline-primary {
  transform: scale(1.05);
}

.btn-check:focus + .btn-outline-primary,
.btn-outline-primary:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 0.25rem rgba(77, 88, 106, 0.25);
}

/* ===== FORMULARIOS ===== */

.form-label-extended {
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--color-dark);
}

.form-control,
.form-select {
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid #dee2e6;
}

.form-control:focus,
.form-select:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 0.25rem rgba(77, 88, 106, 0.25);
  background: rgba(255, 255, 255, 0.95);
  outline: 0;
}

select.form-select:focus {
  --bs-border-color: var(--color-primary);
  --bs-form-select-focus-border-color: var(--color-primary);
  --bs-form-select-focus-box-shadow: 0 0 0 0.25rem rgba(77, 88, 106, 0.25);
}

.form-select option:checked,
.form-select option:hover {
  background-color: var(--color-primary);
  color: white;
}

.form-check-input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 0.25rem rgba(77, 88, 106, 0.25);
}

.form-check-input:checked {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
}

.form-check-label {
  cursor: pointer;
  user-select: none;
}

input::placeholder,
textarea::placeholder,
select::placeholder {
  color: #adb5bd;
  opacity: 1;
}

.campo-invalido {
  border-color: #c74444;
  border-width: 2px;
}

.fieldset-invalido {
  border: 2px solid #c74444;
  border-radius: 0.375rem;
  padding: 0.75rem;
}

/* ===== ALERTS ===== */

.alert {
  border: none;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.alert-info {
  background: rgba(77, 88, 106, 0.1);
  border: 1px solid rgba(77, 88, 106, 0.3);
  color: var(--color-dark);
}

/* ===== TABLAS RESULTADO===== */

.table {
  margin-bottom: 0;
  background: rgba(255, 255, 255, 0.8);
}

.table td {
  padding: 0.5rem;
  vertical-align: middle;
}

.table .fw-bold {
  width: 40%;
  color: var(--color-dark);
}

/* ===== UTILIDADES ===== */

.hint-text {
  font-size: 0.85rem;
  color: #6c757d;
  margin-top: 0.25rem;
}

.text-white {
  text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.8);
}

/* ===== RESPONSIVE ===== */

@media (max-width: 768px) {
  body {
    padding: 10px 0;
    background-attachment: scroll;
  }

  .container {
    padding: 0 10px;
  }

  .emoji-result {
    font-size: 60px;
  }

  .btn-group {
    flex-direction: column;
  }

  .btn-group .btn {
    border-radius: 0.375rem;
    margin-bottom: 0.5rem;
  }
}

@media (min-width: 992px) {
  .card-body .row > [class*="col-lg-"] {
    border-right: 1px solid rgba(0, 0, 0, 0.1);
  }
  
  .card-body .row > [class*="col-lg-"]:last-child {
    border-right: none;
  }
}