/* =========================================================
   POLITÉCNICO DE LOS LLANOS - BUZÓN ESTUDIANTIL
   ---------------------------------------------------------
   Aquí definí todos los estilos visuales de mi plataforma.
   Elegí un diseño formal en modo claro (Light Mode) con fondo blanco,
   usando el rojo representativo del Politécnico de los Llanos (#dc2626)
   para botones y acentos, y animaciones de aceleración tipo Apple.
   ========================================================= */

:root {
  /* Variables de colores principales para reutilizarlas en todo el código */
  --bg-main: #f8fafc;
  --bg-card: #ffffff;
  --bg-field: #ffffff;
  --border-line: #e2e8f0;
  --border-field: #cbd5e1;
  --border-active: #dc2626;

  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;

  /* Rojo Institucional del Politécnico de los Llanos */
  --red-primary: #dc2626;
  --red-hover: #b91c1c;
  --red-glow: rgba(220, 38, 38, 0.16);
  --red-subtle: #fef2f2;

  --radius-sm: 6px;
  --radius-md: 12px;
  --font-stack: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --shadow-card: 0 4px 20px -2px rgba(15, 23, 42, 0.07);
  --shadow-card-hover: 0 16px 36px -6px rgba(15, 23, 42, 0.12);

  /* Curvas de aceleración suaves tipo Apple (Fluid Spring Easing) */
  --apple-ease: cubic-bezier(0.16, 1, 0.3, 1);
  --apple-ease-slow: cubic-bezier(0.2, 0.9, 0.25, 1);
  --duration-slow: 0.85s;
  --duration-medium: 0.55s;
  --duration-fast: 0.35s;
}

/* Reset y base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--bg-main);
  color: var(--text-primary);
  font-family: var(--font-stack);
  line-height: 1.55;
  padding: 3rem 1.25rem;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

.container {
  max-width: 740px;
  margin: 0 auto;
}

/* =========================================================
   ANIMACIONES DE ENTRADA PROGRESIVA (TIPO APPLE)
   Aquí creé estas animaciones 'appleFadeUp' y 'appleScaleIn'
   para que cuando cargue la página, los elementos aparezcan
   deslizándose suavemente hacia arriba con efecto de flotación.
   ========================================================= */

@keyframes appleFadeUp {
  0% {
    opacity: 0;
    transform: translateY(28px);
  }
  100% {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes appleScaleIn {
  0% {
    opacity: 0;
    transform: scale(0.92);
  }
  100% {
    opacity: 1;
    transform: scale(1);
  }
}

/* ENCABEZADO:
   Aquí estilicé el bloque con el logo, el nombre institucional y el título */
.header {
  border-bottom: 1px solid var(--border-line);
  padding-bottom: 1.75rem;
  margin-bottom: 2rem;
  animation: appleFadeUp var(--duration-slow) var(--apple-ease) 0.05s both;
}

.logo-area {
  display: flex;
  align-items: center;
  gap: 1.15rem;
  margin-bottom: 1.25rem;
}

/* Logo Oficial: le puse forma redondeada y un efecto hover interactivo */
.logo-img {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  object-fit: cover;
  background-color: #ffffff;
  padding: 2px;
  border: 2px solid var(--border-line);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
  animation: appleScaleIn 1s var(--apple-ease) 0.15s both;
  transition: transform 0.65s var(--apple-ease), box-shadow 0.65s var(--apple-ease);
  cursor: pointer;
}

.logo-img:hover {
  transform: scale(1.08) rotate(2deg);
  box-shadow: 0 8px 24px rgba(220, 38, 38, 0.22);
}

.institution-name {
  font-size: 1.02rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  color: var(--text-primary);
  transition: color 0.4s var(--apple-ease);
}

.portal-tag {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.main-title {
  font-size: 1.75rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 0.4rem;
}

.description {
  font-size: 0.92rem;
  color: var(--text-secondary);
  max-width: 650px;
}

/* =========================================================
   TARJETA DEL FORMULARIO PRINCIPAL
   Aquí diseñé la caja blanca contenedora con sombra suave
   y la línea roja institucional de 4px en la parte superior.
   ========================================================= */

.form-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-line);
  border-top: 4px solid var(--red-primary);
  border-radius: var(--radius-md);
  padding: 2.25rem;
  box-shadow: var(--shadow-card);
  animation: appleFadeUp 1s var(--apple-ease) 0.2s both;
  transition: transform 0.7s var(--apple-ease), box-shadow 0.7s var(--apple-ease), border-color 0.7s var(--apple-ease);
}

.form-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-card-hover);
}

/* Secciones internas del formulario con animación de entrada escalonada */
.form-section {
  border: none;
  border-top: 1px solid var(--border-line);
  padding-top: 1.6rem;
  margin-bottom: 1.8rem;
  animation: appleFadeUp 0.85s var(--apple-ease) both;
}

.form-section:nth-of-type(1) { animation-delay: 0.32s; border-top: none; padding-top: 0; }
.form-section:nth-of-type(2) { animation-delay: 0.45s; }
.form-section:nth-of-type(3) { animation-delay: 0.58s; }

/* Título de cada sección con un indicador vertical rojo a la izquierda */
.section-title {
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--text-primary);
  margin-bottom: 1.15rem;
  padding: 0;
  display: flex;
  align-items: center;
  gap: 0.55rem;
}

.section-title::before {
  content: '';
  display: inline-block;
  width: 4px;
  height: 15px;
  background-color: var(--red-primary);
  border-radius: 2px;
  transition: transform 0.5s var(--apple-ease), height 0.5s var(--apple-ease);
}

.form-section:hover .section-title::before {
  transform: scaleY(1.25);
}

/* Filas y Grupos */
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  margin-bottom: 1rem;
}

.form-group {
  margin-bottom: 1rem;
  transition: opacity 0.55s var(--apple-ease), transform 0.55s var(--apple-ease);
}

/* Casilla de verificación animada */
.form-group-checkbox {
  margin-bottom: 1.25rem;
  padding: 0.75rem 1rem;
  background-color: #f1f5f9;
  border: 1px solid var(--border-line);
  border-radius: var(--radius-sm);
  transition: background-color 0.45s var(--apple-ease), border-color 0.45s var(--apple-ease), transform 0.45s var(--apple-ease);
}

.form-group-checkbox:hover {
  background-color: #e2e8f0;
  transform: translateX(2px);
}

.checkbox-container {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  cursor: pointer;
  user-select: none;
}

.checkbox-container input[type="checkbox"] {
  width: 17px;
  height: 17px;
  accent-color: var(--red-primary);
  cursor: pointer;
  transition: transform 0.3s var(--apple-ease);
}

.checkbox-container input[type="checkbox"]:hover {
  transform: scale(1.15);
}

.checkbox-label {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color 0.3s var(--apple-ease);
}

label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.4rem;
  transition: color 0.35s var(--apple-ease);
}

.req {
  color: var(--red-primary);
  font-weight: 700;
  margin-left: 2px;
  transition: transform 0.3s var(--apple-ease);
  display: inline-block;
}

.opt {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-weight: 500;
  margin-left: 4px;
}

/* =========================================================
   BOTÓN SIMPLE Y DIRECTO DE MODO ANÓNIMO
   Aquí diseñé el botón que conmuta entre Anónimo y No Anónimo.
   Le puse fondo verde suave cuando está activo (is-anonimo)
   para transmitir privacidad y seguridad, y fondo azul suave
   cuando pasa a modo identificado (is-no-anonimo).
   ========================================================= */

.toggle-mode-container {
  margin-bottom: 1.5rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--border-line);
  animation: appleFadeUp 0.6s var(--apple-ease) 0.15s both;
}

.btn-anonimo-directo {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 0.75rem 1.4rem;
  font-size: 0.95rem;
  font-weight: 700;
  font-family: inherit;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.25s var(--apple-ease);
  box-shadow: 0 2px 6px rgba(15, 23, 42, 0.05);
}

/* Estado Anónimo (Verde Suave Institucional) */
.btn-anonimo-directo.is-anonimo {
  background-color: #f0fdf4;
  color: #15803d;
  border: 1.5px solid #86efac;
}

.btn-anonimo-directo.is-anonimo:hover {
  background-color: #dcfce7;
  border-color: #4ade80;
}

/* Estado No Anónimo (Azul Suave) */
.btn-anonimo-directo.is-no-anonimo {
  background-color: #eff6ff;
  color: #1d4ed8;
  border: 1.5px solid #93c5fd;
}

.btn-anonimo-directo.is-no-anonimo:hover {
  background-color: #dbeafe;
  border-color: #60a5fa;
}

.btn-anonimo-directo:active {
  transform: scale(0.98);
}

.btn-anonimo-icon {
  font-size: 1rem;
  line-height: 1;
}

.btn-anonimo-texto {
  font-size: 0.95rem;
  letter-spacing: 0.01em;
}

/* Esta regla la forcé con '!important' para garantizar que los campos
   personales nunca aparezcan a menos que se desactive el modo anónimo */
#seccionDatosEstudiante.is-hidden {
  display: none !important;
}

/* Campo selector formal para grados */
.field-select {
  width: 100%;
  padding: 0.85rem 1rem;
  font-size: 0.93rem;
  font-family: inherit;
  color: var(--text-primary);
  background-color: var(--bg-field);
  border: 1px solid var(--border-field);
  border-radius: var(--radius-sm);
  outline: none;
  cursor: pointer;
  transition: border-color 0.25s var(--apple-ease), box-shadow 0.25s var(--apple-ease);
}

.field-select:focus {
  border-color: var(--red-primary);
  box-shadow: 0 0 0 3px var(--red-glow);
}

.form-group:focus-within label .req {
  transform: scale(1.25);
}

/* =========================================================
   CASILLA COMPACTA DESPLEGABLE DE ÁREA (ESTILO APPLE)
   ========================================================= */

.custom-select-wrapper {
  position: relative;
  width: 100%;
}

.custom-select-trigger {
  width: 100%;
  min-height: 45px;
  background-color: var(--bg-field);
  border: 1px solid var(--border-field);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  padding: 0.72rem 0.95rem;
  font-size: 0.9rem;
  font-family: inherit;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  text-align: left;
  outline: none;
  user-select: none;
  transition: border-color 0.45s var(--apple-ease), 
              box-shadow 0.45s var(--apple-ease), 
              background-color 0.45s var(--apple-ease),
              transform 0.45s var(--apple-ease);
}

.custom-select-trigger:hover {
  border-color: var(--red-hover);
  box-shadow: 0 3px 10px rgba(220, 38, 38, 0.08);
}

.custom-select-wrapper.open .custom-select-trigger {
  border-color: var(--red-primary);
  box-shadow: 0 0 0 3px var(--red-glow);
  background-color: #ffffff;
}

.trigger-left {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* Iconos minimalistas en color negro elegante */
.trigger-icon,
.item-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  color: #0f172a;
  flex-shrink: 0;
  transition: color 0.35s var(--apple-ease), transform 0.35s var(--apple-ease);
}

.trigger-chevron {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  flex-shrink: 0;
  transition: transform 0.45s var(--apple-ease), color 0.35s var(--apple-ease);
}

.custom-select-wrapper.open .trigger-chevron {
  transform: rotate(180deg);
  color: var(--red-primary);
}

/* Menú desplegable flotante estilo Apple */
.custom-dropdown-menu {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  right: 0;
  z-index: 100;
  background-color: #ffffff;
  border: 1px solid var(--border-line);
  border-radius: var(--radius-sm);
  box-shadow: 0 16px 36px -4px rgba(15, 23, 42, 0.16), 0 4px 12px rgba(0, 0, 0, 0.04);
  padding: 0.4rem;
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateY(-8px) scale(0.98);
  transition: opacity 0.35s var(--apple-ease), 
              transform 0.35s var(--apple-ease), 
              visibility 0.35s var(--apple-ease);
}

.custom-select-wrapper.open .custom-dropdown-menu {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateY(0) scale(1);
}

/* Elementos dentro del menú desplegable */
.dropdown-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.65rem 0.85rem;
  border-radius: 4px;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-primary);
  cursor: pointer;
  user-select: none;
  transition: background-color 0.25s var(--apple-ease), 
              color 0.25s var(--apple-ease), 
              transform 0.25s var(--apple-ease),
              padding-left 0.25s var(--apple-ease);
}

.dropdown-item:hover {
  background-color: var(--red-subtle);
  color: var(--red-primary);
  padding-left: 1.05rem;
}

.dropdown-item:hover .item-icon {
  color: var(--red-primary);
  transform: scale(1.15);
}

.dropdown-item.selected {
  background-color: var(--red-subtle);
  color: var(--red-primary);
  font-weight: 700;
}

.dropdown-item.selected .item-icon {
  color: var(--red-primary);
}

@keyframes appleShake {
  0%, 100% { transform: translateX(0); }
  20%, 60% { transform: translateX(-6px); }
  40%, 80% { transform: translateX(6px); }
}

.custom-select-wrapper.shake {
  animation: appleShake 0.45s var(--apple-ease);
}

/* =========================================================
   CAMPOS DE ENTRADA Y TEXTAREAS
   Aquí configuré el diseño de todos los campos de texto.
   Al hacer clic adentro (focus), se iluminan con un borde rojo institucional
   y un resplandor suave para indicarle al usuario dónde está escribiendo.
   ========================================================= */

input[type="text"],
input[type="email"],
select,
textarea {
  width: 100%;
  background-color: var(--bg-field);
  border: 1px solid var(--border-field);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  padding: 0.78rem 0.95rem;
  font-size: 0.9rem;
  font-family: inherit;
  outline: none;
  transition: border-color 0.45s var(--apple-ease), 
              box-shadow 0.45s var(--apple-ease), 
              background-color 0.45s var(--apple-ease),
              transform 0.45s var(--apple-ease);
}

input[type="text"]:focus,
input[type="email"]:focus,
select:focus,
textarea:focus {
  border-color: var(--red-primary);
  box-shadow: 0 0 0 4px var(--red-glow);
  transform: translateY(-1px);
  background-color: #ffffff;
}

input:disabled {
  background-color: #f1f5f9;
  color: var(--text-muted);
  border-color: var(--border-line);
  cursor: not-allowed;
  opacity: 0.65;
  transform: none !important;
  box-shadow: none !important;
}

select {
  cursor: pointer;
}

textarea {
  resize: vertical;
  min-height: 90px;
}

.help-text {
  display: block;
  font-size: 0.76rem;
  color: var(--text-muted);
  margin-top: 0.35rem;
  transition: color 0.3s var(--apple-ease);
}

/* =========================================================
   BOTONES INTERACTIVOS (PRESION Y ELEVACIÓN TIPO APPLE)
   ========================================================= */

.form-actions {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  margin-top: 2rem;
  padding-top: 1.6rem;
  border-top: 1px solid var(--border-line);
  animation: appleFadeUp 0.85s var(--apple-ease) 0.68s both;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  padding: 0.9rem 1.5rem;
  font-size: 0.93rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  text-decoration: none;
  user-select: none;
  transition: transform 0.45s var(--apple-ease), 
              box-shadow 0.45s var(--apple-ease), 
              background-color 0.45s var(--apple-ease), 
              border-color 0.45s var(--apple-ease),
              opacity 0.45s var(--apple-ease);
}

/* Pulsación táctil (Tactile Apple compression on click) */
.btn:active {
  transform: scale(0.975);
}

/* Botón principal en rojo institucional */
.btn-primary {
  background-color: var(--red-primary);
  color: #ffffff;
  border: 1px solid var(--red-primary);
  box-shadow: 0 4px 14px rgba(220, 38, 38, 0.28);
}

.btn-primary:hover {
  background-color: var(--red-hover);
  border-color: var(--red-hover);
  box-shadow: 0 8px 25px rgba(220, 38, 38, 0.38);
  transform: translateY(-2px);
}

.btn-primary:active {
  transform: scale(0.975);
  box-shadow: 0 2px 8px rgba(220, 38, 38, 0.25);
}

/* Botón secundario */
.btn-secondary {
  background-color: #ffffff;
  color: var(--text-primary);
  border: 1px solid var(--border-field);
}

.btn-secondary:hover {
  background-color: #f8fafc;
  border-color: var(--text-secondary);
  box-shadow: 0 4px 12px rgba(15, 23, 42, 0.05);
  transform: translateY(-1px);
}

.btn-secondary:active {
  transform: scale(0.975);
}

/* =========================================================
   NOTIFICACION FLOTANTE FLUIDA (APPLE DYNAMIC BANNER)
   ========================================================= */

.alert-box {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background-color: rgba(15, 23, 42, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  color: #ffffff;
  border-left: 4px solid var(--red-primary);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-left-width: 4px;
  border-left-color: var(--red-primary);
  padding: 0.95rem 1.5rem;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-weight: 600;
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.25);
  display: none;
  z-index: 1000;
  transition: opacity 0.5s var(--apple-ease), transform 0.5s var(--apple-ease);
}

.alert-box.show {
  display: block;
  animation: appleToastIn 0.6s var(--apple-ease) forwards;
}

.alert-box.hide {
  animation: appleToastOut 0.5s var(--apple-ease) forwards;
}

@keyframes appleToastIn {
  0% {
    opacity: 0;
    transform: translateY(24px) scale(0.94);
  }
  100% {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes appleToastOut {
  0% {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
  100% {
    opacity: 0;
    transform: translateY(16px) scale(0.96);
  }
}

/* Pie de página con aparición sutil */
.footer {
  text-align: center;
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-line);
  font-size: 0.82rem;
  color: var(--text-muted);
  animation: appleFadeUp var(--duration-slow) var(--apple-ease) 0.8s both;
}

.footer-sub {
  font-size: 0.75rem;
  margin-top: 0.25rem;
  color: #94a3b8;
}

/* Responsivo */
@media (max-width: 640px) {
  .form-row {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }
  .form-card {
    padding: 1.35rem;
  }
  .main-title {
    font-size: 1.4rem;
  }
}

/* =========================================================
   SPINNER DE CARGA Y VENTANA MODAL DE ÉXITO
   Aquí diseñé la animación del spinner que gira dentro del botón
   y la ventana emergente modal que aparece con desenfoque de fondo
   (backdrop-filter) y un icono verde de verificación cuando se envía la propuesta.
   ========================================================= */

.btn-spinner {
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255, 255, 255, 0.35);
  border-top-color: #ffffff;
  border-radius: 50%;
  animation: spinBtn 0.75s linear infinite;
  display: inline-block;
  margin-right: 4px;
}

@keyframes spinBtn {
  to { transform: rotate(360deg); }
}

.btn:disabled {
  opacity: 0.65;
  cursor: not-allowed;
  transform: none !important;
}

/* Modal de confirmación elegante */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.65);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.25rem;
  z-index: 2000;
  animation: appleOverlayFadeIn 0.3s var(--apple-ease) forwards;
}

.modal-overlay[hidden] {
  display: none;
}

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

.modal-card {
  background: #ffffff;
  border-radius: var(--radius-md);
  max-width: 520px;
  width: 100%;
  padding: 2.25rem 2rem;
  text-align: center;
  box-shadow: 0 24px 60px -12px rgba(15, 23, 42, 0.25);
  border: 1px solid var(--border-line);
  animation: appleModalPop 0.4s var(--apple-ease) forwards;
}

@keyframes appleModalPop {
  from {
    opacity: 0;
    transform: scale(0.92) translateY(16px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

.modal-icon-success {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: #dcfce7;
  color: #16a34a;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
  box-shadow: 0 4px 16px rgba(22, 163, 74, 0.2);
}

.modal-title {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 0.65rem;
  letter-spacing: -0.02em;
}

.modal-desc {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.55;
  margin-bottom: 1.25rem;
}

.modal-details {
  background: #f8fafc;
  border: 1px solid var(--border-line);
  border-radius: var(--radius-sm);
  padding: 0.9rem 1.1rem;
  text-align: left;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  line-height: 1.6;
}

.modal-details strong {
  color: var(--text-primary);
}

.modal-actions {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
}

@media (max-width: 480px) {
  .modal-actions {
    flex-direction: column;
  }
}