/* Componentes Reutilizables & UI Elements */

/* 1. Header & Navegación */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(250, 248, 245, 0.92);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-subtle);
  transition: background-color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.site-header.scrolled {
  box-shadow: 0 4px 20px rgba(35, 34, 30, 0.04);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.8rem;
}

.brand-link {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.brand-name {
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text-heading);
}

.brand-tagline {
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--text-secondary);
}

.nav-desktop {
  display: flex;
  align-items: center;
  gap: 1.8rem;
}

.nav-link {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-body);
  position: relative;
  padding-block: 0.35rem;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background-color: var(--color-olive);
  transition: width 0.25s ease;
}

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

.nav-link:hover::after {
  width: 100%;
}

/* 2. Botones */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 0.9rem 1.9rem;
  font-family: var(--font-main);
  font-size: 0.96rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  border-radius: var(--radius-full);
  border: 1px solid transparent;
  cursor: pointer;
  transition: var(--transition-smooth);
  text-decoration: none;
  line-height: 1;
}

.btn-primary {
  background-color: var(--color-olive);
  color: var(--text-inverse);
  box-shadow: 0 4px 14px rgba(107, 142, 35, 0.25);
}

.btn-primary:hover {
  background-color: var(--color-olive-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(107, 142, 35, 0.32);
  color: var(--text-inverse);
}

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

.btn-outline {
  background-color: transparent;
  border-color: var(--border-medium);
  color: var(--text-heading);
}

.btn-outline:hover {
  border-color: var(--text-heading);
  background-color: rgba(0, 0, 0, 0.02);
  transform: translateY(-2px);
}

.btn-nav {
  padding: 0.65rem 1.35rem;
  font-size: 0.88rem;
}

/* Microcopy bajo botones */
.btn-microcopy {
  display: block;
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-top: 0.65rem;
  letter-spacing: 0.01em;
}

/* 3. Menú Móvil */
.mobile-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
  z-index: 120;
}

.mobile-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--text-heading);
  transition: var(--transition-smooth);
  margin-block: 2.5px;
}

.mobile-toggle.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.mobile-toggle.active span:nth-child(2) {
  opacity: 0;
}

.mobile-toggle.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.mobile-drawer {
  position: fixed;
  top: 4.8rem;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--bg-canvas);
  padding: 2.5rem 1.8rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  transform: translateY(-100%);
  opacity: 0;
  pointer-events: none;
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.25s ease;
  z-index: 90;
  border-bottom: 1px solid var(--border-medium);
}

.mobile-drawer.open {
  transform: translateY(0);
  opacity: 1;
  pointer-events: auto;
}

.mobile-drawer .nav-link {
  font-size: 1.25rem;
  font-weight: 500;
  padding-block: 0.5rem;
  border-bottom: 1px solid var(--border-subtle);
}

/* 4. Formularios Elegantes y Accesibles */
.form-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: clamp(1.8rem, 4vw, 3rem);
  box-shadow: var(--shadow-card);
}

.form-group {
  margin-bottom: 1.5rem;
  text-align: left;
}

.form-label {
  display: block;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-heading);
  margin-bottom: 0.45rem;
}

.form-label .optional {
  font-weight: 400;
  color: var(--text-muted);
  font-size: 0.8rem;
  margin-left: 0.3rem;
}

.form-input,
.form-textarea {
  width: 100%;
  font-family: var(--font-main);
  font-size: 0.98rem;
  color: var(--text-heading);
  background-color: var(--bg-canvas);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-sm);
  padding: 0.85rem 1rem;
  transition: var(--transition-smooth);
}

.form-input:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-olive);
  background-color: var(--bg-surface);
  box-shadow: 0 0 0 3px var(--color-olive-tint);
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--text-muted);
}

.form-textarea {
  min-height: 120px;
  resize: vertical;
}

.form-checkbox-group {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  margin-bottom: 1.8rem;
  cursor: pointer;
}

.form-checkbox {
  appearance: none;
  -webkit-appearance: none;
  width: 19px;
  height: 19px;
  border: 1.5px solid var(--border-medium);
  border-radius: 4px;
  background-color: var(--bg-canvas);
  cursor: pointer;
  position: relative;
  flex-shrink: 0;
  margin-top: 0.2rem;
  transition: var(--transition-smooth);
}

.form-checkbox:checked {
  background-color: var(--color-olive);
  border-color: var(--color-olive);
}

.form-checkbox:checked::after {
  content: '';
  position: absolute;
  top: 2px;
  left: 6px;
  width: 5px;
  height: 9px;
  border: solid var(--text-inverse);
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

.form-checkbox-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.form-checkbox-label a {
  color: var(--text-heading);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.form-checkbox-label a:hover {
  color: var(--color-olive);
}

.form-success-message {
  display: none;
  padding: 2.5rem 2rem;
  background-color: var(--bg-olive-whisper);
  border: 1px solid var(--color-olive-subtle);
  border-radius: var(--radius-md);
  text-align: center;
}

.form-success-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.6rem;
}

.form-success-mark {
  display: block;
  font-size: 1.2rem;
  color: var(--color-olive);
  margin-bottom: 0.4rem;
  opacity: 0.7;
}

.form-success-heading {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--color-olive-dark);
  margin: 0;
}

.form-success-body {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.65;
  max-width: 38ch;
  margin: 0;
}

/* 5. Portada del Libro (Imagen real con fondo transparente e integrada) */
.book-showcase-container {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 0;
  background: transparent;
}

.book-cover-img {
  width: 100%;
  max-width: 480px;
  height: auto;
  display: block;
  /* Sombra sutil y natural que realza el volumen físico del libro 3D transparente */
  filter: drop-shadow(0 20px 32px rgba(35, 34, 30, 0.14)) drop-shadow(0 4px 12px rgba(35, 34, 30, 0.06));
  transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1), filter 0.35s ease;
}

.book-cover-img:hover {
  transform: translateY(-4px) scale(1.015);
  filter: drop-shadow(0 26px 40px rgba(35, 34, 30, 0.18)) drop-shadow(0 6px 14px rgba(35, 34, 30, 0.08));
}

/* 6. Contenedor de Video Responsivo */
.video-frame-container {
  position: relative;
  width: 100%;
  padding-bottom: 56.25%; /* 16:9 Aspect Ratio */
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: #1A1A18;
  box-shadow: var(--shadow-card);
}

.video-frame-container iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

/* Responsive Queries para Componentes */
@media (max-width: 900px) {
  .nav-desktop {
    display: none;
  }
  .mobile-toggle {
    display: flex;
  }
}