/* ==========================================================================
   1. VARIABLES GLOBALES (PALETA DE COLORES Y MEDIDAS)
   ========================================================================== */
:root {
  --color-fondo-oscuro: #090314;
  --color-naranja-boton: #ff6b00;
  --color-naranja-hover: #ff8533;
  --color-verde-activo: #00e676;
  --color-texto-blanco: #ffffff;
  --color-texto-suave: rgba(255, 255, 255, 0.75);
  --color-texto-atenuado: rgba(255, 255, 255, 0.5);

  --vidrio-fondo: rgba(36, 14, 65, 0.45);
  --vidrio-borde: rgba(255, 255, 255, 0.18);
  --vidrio-desenfoque: blur(24px);
  --vidrio-sombra: 0 20px 50px rgba(0, 0, 0, 0.5), inset 0 1px 1px rgba(255, 255, 255, 0.2);

  --fuente-principal: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
}

/* ==========================================================================
   2. REINICIO Y ESTRUCTURA BASE
   ========================================================================== */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
}

body {
  background-color: var(--color-fondo-oscuro);
  font-family: var(--fuente-principal);
  color: var(--color-texto-blanco);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 16px;
}

/* CONTENEDOR TIPO MÓVIL Y FONDO CON TEXTURA DE SEDA VIOLETA */
.app-container {
  position: relative;
  width: 100%;
  max-width: 410px;
  min-height: 890px;
  border-radius: 44px;
  overflow: hidden;
  box-shadow: 0 25px 70px rgba(0, 0, 0, 0.7);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 34px 22px 28px 22px;

  background: linear-gradient(180deg, rgba(9, 3, 20, 0.4) 0%, rgba(9, 3, 20, 0.8) 100%),
              radial-gradient(circle at 80% 20%, rgba(217, 38, 255, 0.35) 0%, transparent 50%),
              radial-gradient(circle at 10% 80%, rgba(106, 0, 255, 0.45) 0%, transparent 60%),
              #130224;
  background-size: cover;
  background-position: center;
}

/* ==========================================================================
   3. CABECERA SUPERIOR (BADGE + BOTÓN RECARGAR)
   ========================================================================== */
.cabecera-superior {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  z-index: 10;
}

.badge-modo-aula {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: 9999px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(10px);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  color: #e2d9f3;
}

.punto-indicador-verde {
  width: 8px;
  height: 8px;
  background-color: var(--color-verde-activo);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--color-verde-activo);
  display: inline-block;
}

.reload-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(10px);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--color-texto-blanco);
  transition: all 0.2s ease;
}

.reload-btn svg {
  width: 18px;
  height: 18px;
  stroke: currentColor;
  stroke-width: 2.5;
  fill: none;
  transition: transform 0.3s ease;
}

.reload-btn:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: rotate(45deg);
}

/* ==========================================================================
   4. LOGOTIPO
   ========================================================================== */
.app-header {
  text-align: center;
  margin-top: 10px;
  margin-bottom: 20px;
  z-index: 10;
  display: flex;
  justify-content: center;
  align-items: center;
}

.app-logo {
  width: 100%;
  max-width: 320px;
  height: auto;
  object-fit: contain;
  filter: drop-shadow(0 4px 20px rgba(0, 0, 0, 0.6));
}

/* ==========================================================================
   5. TARJETA CENTRAL DE CRISTAL (GLASSMORPHISM)
   ========================================================================== */
.view-section {
  background: var(--vidrio-fondo);
  border: 1.5px solid var(--vidrio-borde);
  backdrop-filter: var(--vidrio-desenfoque);
  -webkit-backdrop-filter: var(--vidrio-desenfoque);
  border-radius: 28px;
  padding: 24px 20px;
  box-shadow: var(--vidrio-sombra);
  z-index: 10;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

label, .section-title-active {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  color: #dfd7f2;
  margin-left: 2px;
  text-shadow: none;
}

/* INPUTS Y SELECTS DE CRISTAL */
input[type="text"],
select {
  width: 100%;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 16px;
  padding: 14px 16px;
  color: var(--color-texto-blanco);
  font-size: 15px;
  font-weight: 500;
  outline: none;
  transition: border-color 0.2s, background 0.2s;
}

input[type="text"]::placeholder {
  color: rgba(255, 255, 255, 0.4);
}

input[type="text"]:focus,
select:focus {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.3);
}

select option {
  background-color: #130224;
  color: #ffffff;
}

/* ==========================================================================
   6. BOTONES PRINCIPALES (NARANJA BRILLANTE)
   ========================================================================== */
button:not(.reload-btn) {
  width: 100%;
  background: linear-gradient(135deg, #ff7a00 0%, #ff5500 100%);
  border: none;
  border-radius: 18px;
  padding: 16px 20px;
  color: #ffffff;
  font-family: var(--fuente-principal);
  font-size: 15px;
  font-weight: 800;
  letter-spacing: 1px;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  cursor: pointer;
  box-shadow: 0 10px 28px rgba(255, 100, 0, 0.45),
              inset 0 1px 1px rgba(255, 255, 255, 0.35);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

button:not(.reload-btn):hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 34px rgba(255, 100, 0, 0.6),
              inset 0 1px 1px rgba(255, 255, 255, 0.45);
}

button:not(.reload-btn):active {
  transform: translateY(1px);
  box-shadow: 0 6px 18px rgba(255, 100, 0, 0.4);
}

.actions-group {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 4px;
}

/* BOTÓN SALIR */
#btn-salir {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 100, 100, 0.3);
  color: #ff6b6b;
  box-shadow: none;
}

#btn-salir:hover {
  background: rgba(255, 100, 100, 0.15);
  box-shadow: 0 8px 20px rgba(255, 100, 100, 0.2);
}

/* ==========================================================================
   7. LISTA DE ALUMNOS Y ESTADO TÉCNICO INFERIOR
   ========================================================================== */
.students-list-box {
  width: 100%;
  height: 200px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 14px;
  padding: 12px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.empty-list-text {
  color: rgba(255, 255, 255, 0.4);
  font-style: italic;
  text-align: center;
  margin-top: 70px;
  font-size: 13px;
}

.student-item {
  padding: 10px 14px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 10px;
  font-size: 14px;
  font-weight: 500;
  border-left: 3px solid var(--color-verde-activo);
  color: #ffffff;
}

.status-container {
  background: rgba(12, 4, 25, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(16px);
  border-radius: 20px;
  padding: 12px 18px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 10;
  margin-top: 10px;
}

#estado-conexion {
  font-size: 13px;
  font-weight: 700;
  color: var(--color-texto-blanco);
}

.hidden-audio {
  display: none;
}