/* 
  LMS PLCLM 2027 - Sistema de Diseño Unificado 
  Comparte recursos a través de los diferentes módulos (BACKEND, FRONTEND, WEBCORPORATIVA)
*/

:root {
  /* ========================================================
     1. COLORES CORPORATIVOS (Paleta estricta PLCLM 2027)
     ======================================================== */
  --plclm-light-blue: #E1E9EF;
  --plclm-yellow: #F9BE3D;
  --plclm-green: #0E9C29;
  --plclm-navy: #1F3B56;
  --plclm-beige: #B7A381;
  --plclm-offwhite: #F3FCFF;
  --plclm-white: #FFFFFF;
  --plclm-dark-yellow: #F4A415;

  /* ========================================================
     2. VARIABLES SEMÁNTICAS (Modo Claro por defecto)
     ======================================================== */
  --bg-body: var(--plclm-offwhite);
  --bg-card: var(--plclm-white);
  
  --text-primary: var(--plclm-navy);
  --text-secondary: #4a5568; /* Gris neutral para textos secundarios */
  
  --color-primary: var(--plclm-navy);
  --color-primary-hover: #15293d; /* Darker navy */
  
  --color-accent: var(--plclm-yellow);
  --color-accent-hover: var(--plclm-dark-yellow);
  
  --color-success: var(--plclm-green);
  
  --border-color: var(--plclm-light-blue);
  
  /* Fuentes corporativas recomendadas por la skill (Montserrat e Inter) */
  --font-heading: 'Montserrat', sans-serif;
  --font-body: 'Inter', sans-serif;
}

/* ========================================================
   3. MODO OSCURO (Activado vía data-theme="dark" en <html>)
   ======================================================== */
html[data-theme="dark"] {
  --bg-body: #102131; /* Un azul mucho más oscuro que el navy */
  --bg-card: var(--plclm-navy);
  
  --text-primary: var(--plclm-white);
  --text-secondary: var(--plclm-light-blue);
  
  --border-color: #2c4a6b; /* Un borde sutil para tarjetas oscuras */
}

/* ========================================================
   4. ESTILOS BASE Y CLASES UTILITARIAS
   ======================================================== */
body {
  font-family: var(--font-body);
  background-color: var(--bg-body);
  color: var(--text-primary);
  margin: 0;
  padding: 0;
  transition: background-color 0.3s ease, color 0.3s ease;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--text-primary);
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

.card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1.5rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

.btn {
  display: inline-block;
  font-family: var(--font-body);
  font-weight: 600;
  text-align: center;
  padding: 0.75rem 1.5rem;
  border-radius: 4px;
  cursor: pointer;
  border: none;
  transition: background-color 0.2s ease, transform 0.1s ease;
  text-decoration: none;
}

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

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

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

.btn-accent {
  background-color: var(--color-accent);
  color: var(--plclm-navy);
}

.btn-accent:hover {
  background-color: var(--color-accent-hover);
}

/* ========================================================
   5. LAYOUT BACKEND Y COMPONENTES
   ======================================================== */
.admin-layout {
  display: flex;
  min-height: 100vh;
  margin: 0;
  overflow-x: hidden;
}

.sidebar {
  width: 250px;
  background-color: var(--plclm-navy);
  color: var(--plclm-white);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  transition: all 0.3s ease;
}

.sidebar-header {
  padding: 20px;
  text-align: center;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.sidebar-header img {
  width: 100px;
  height: 100px;
  margin-bottom: 10px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid var(--plclm-yellow);
  background-color: var(--plclm-yellow);
}

.sidebar-nav {
  list-style: none;
  padding: 0;
  margin: 0;
  flex-grow: 1;
  overflow-y: auto;
}

.nav-link {
  display: flex;
  align-items: center;
  padding: 12px 20px;
  color: var(--plclm-light-blue);
  text-decoration: none;
  font-weight: 500;
  transition: all 0.2s ease;
  border-left: 4px solid transparent;
}

.nav-link svg {
  margin-right: 12px;
  width: 20px;
  text-align: center;
}

.nav-link:hover, .nav-link.active {
  background-color: var(--color-primary-hover);
  color: var(--plclm-yellow);
  border-left-color: var(--plclm-yellow);
}

.nav-group-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  color: rgba(255, 255, 255, 0.7);
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  border-left: 4px solid transparent;
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  margin-top: 10px;
}

.nav-group-header:hover {
  background-color: rgba(255, 255, 255, 0.05);
  color: var(--plclm-white);
}

.nav-group-header.active {
  background-color: rgba(0, 0, 0, 0.2);
  border-left-color: var(--plclm-beige);
  color: var(--plclm-white);
}

.nav-group-header svg {
  width: 16px;
  height: 16px;
  transition: transform 0.2s;
}

.nav-group-header.collapsed svg:last-child {
  transform: rotate(-90deg);
}

.nav-group-items {
  max-height: 500px;
  overflow: hidden;
  transition: max-height 0.3s ease-out;
  background-color: rgba(0,0,0,0.1);
}

.nav-group-items.collapsed {
  max-height: 0;
}

.nav-group-items .nav-link {
  padding-left: 45px;
  font-size: 0.9rem;
}
.main-content {
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  background-color: var(--bg-body);
}

.top-header {
  background-color: var(--bg-card);
  padding: 15px 30px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-color);
  box-shadow: 0 2px 10px rgba(0,0,0,0.02);
}

.top-header h2 {
  margin: 0;
  font-size: 1.2rem;
  color: var(--text-primary);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 15px;
}

.user-profile {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
}

.dashboard-content {
  padding: 30px;
  flex-grow: 1;
  overflow-y: auto;
}

.dashboard-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
  margin-bottom: 30px;
}

.stat-card {
  display: flex;
  align-items: center;
  padding: 20px;
  border-left: 5px solid var(--color-accent);
}

.stat-icon {
  font-size: 2.5rem;
  color: var(--color-accent);
  margin-right: 20px;
  background-color: rgba(249, 190, 61, 0.1);
  width: 60px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
}

.stat-details h3 {
  margin: 0;
  font-size: 1.8rem;
  color: var(--text-primary);
}

.stat-details p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.9rem;
  text-transform: uppercase;
  font-weight: 600;
}

.panel {
  background-color: var(--bg-card);
  border-radius: 8px;
  border: 1px solid var(--border-color);
  overflow: hidden;
}

.panel-header {
  padding: 15px 20px;
  border-bottom: 1px solid var(--border-color);
  background-color: rgba(0,0,0,0.02);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.panel-header h3 {
  margin: 0;
  font-size: 1.1rem;
}

.list-group {
  list-style: none;
  margin: 0;
  padding: 0;
}

.list-group-item {
  padding: 15px 20px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.list-group-item:last-child {
  border-bottom: none;
}

.badge {
  padding: 4px 8px;
  border-radius: 4px;
  font-size: 0.8rem;
  font-weight: 600;
}

.badge-danger {
  background-color: #ffebee;
  color: #c62828;
}

.badge-success {
  background-color: #e8f5e9;
  color: var(--plclm-green);
}

.badge-warning {
  background-color: #fff8e1;
  color: #f57f17;
}

.text-muted { color: var(--text-secondary); font-size: 0.85rem; }

/* ========================================================
   6. LAYOUT FRONTEND Y COMPONENTES (Alumno)
   ======================================================== */
.student-layout {
  display: flex;
  min-height: 100vh;
  margin: 0;
  overflow-x: hidden;
  background-color: var(--bg-body);
}

.frontend-sidebar {
  width: 250px;
  background-color: var(--plclm-navy);
  color: var(--plclm-white);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  transition: all 0.3s ease;
}

.student-welcome {
  background: linear-gradient(135deg, var(--plclm-navy) 0%, #2c4a6b 100%);
  color: white;
  border-radius: 12px;
  padding: 2rem;
  margin-bottom: 2rem;
  box-shadow: 0 10px 20px rgba(0,0,0,0.05);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.student-welcome h2 {
  color: var(--plclm-white);
  font-size: 1.8rem;
  margin: 0 0 10px 0;
}

.student-welcome p {
  color: var(--plclm-light-blue);
  margin: 0;
  font-size: 1rem;
}

.progress-circle {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: conic-gradient(var(--plclm-yellow) 65%, rgba(255,255,255,0.2) 0);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  font-size: 1.2rem;
}

.progress-circle::after {
  content: "";
  width: 65px;
  height: 65px;
  border-radius: 50%;
  background: var(--plclm-navy);
  position: absolute;
}

.progress-value {
  z-index: 1;
  color: var(--plclm-yellow);
}

/* ========================================================
   7. AUTENTICACIÓN (LOGIN)
   ======================================================== */
.auth-layout {
  display: flex;
  min-height: 100vh;
  width: 100%;
  background-color: var(--bg-body);
}

.auth-visual {
  flex: 1;
  background-color: var(--plclm-navy);
  position: relative;
  display: none;
  overflow: hidden;
}

@media (min-width: 768px) {
  .auth-visual {
    display: flex;
    align-items: center;
    justify-content: center;
  }
}

.auth-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.85;
}

.auth-visual-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, rgba(31,59,86,0.9) 0%, rgba(31,59,86,0.6) 100%);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  color: var(--plclm-white);
  text-align: center;
  padding: 2rem;
}

.auth-form-wrapper {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  max-width: 600px;
  margin: 0 auto;
}

.auth-card {
  width: 100%;
  max-width: 550px;
  background: var(--bg-card);
  padding: 3rem;
  border-radius: 16px;
  box-shadow: 0 15px 35px rgba(0,0,0,0.1);
  border: 1px solid var(--border-color);
}

.auth-logo {
  text-align: center;
  margin-bottom: 2.5rem;
}

.auth-logo h2 {
  font-size: 2.2rem;
  margin: 0;
  color: var(--text-primary);
}

.auth-logo p {
  color: var(--text-secondary);
  font-size: 1.1rem;
  margin-top: 0.5rem;
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
}

.form-control {
  width: 100%;
  padding: 0.75rem 1rem;
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--text-primary);
  background-color: var(--bg-body);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  transition: border-color 0.2s, box-shadow 0.2s;
  box-sizing: border-box;
}

.form-control:focus {
  outline: none;
  border-color: var(--plclm-yellow);
  box-shadow: 0 0 0 3px rgba(249, 190, 61, 0.15);
}

.input-icon-wrapper {
  position: relative;
}

.input-icon-wrapper i {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-secondary);
  font-size: 1.1rem;
}

.input-icon-wrapper .form-control {
  padding-left: 2.8rem;
}

.alert {
  padding: 1rem;
  border-radius: 6px;
  margin-bottom: 1.5rem;
  font-size: 0.9rem;
  font-weight: 500;
}

.alert-danger {
  background-color: #ffebee;
  color: #c62828;
  border: 1px solid #ffcdd2;
}

.captcha-box {
  background: var(--bg-body);
  padding: 1rem;
  border-radius: 6px;
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
}

.captcha-box span {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 1px;
}

.captcha-box input {
  width: 80px;
  text-align: center;
  font-size: 1.1rem;
  font-weight: bold;
}