/* ============================================================
   plataforma.css — Estilos Premium para la Plataforma de Alumnos
   ============================================================ */

/* ── Login de Alumnos ────────────────────────────────────── */
.student-login {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: radial-gradient(circle at center, #1b0202 0%, var(--c-dark) 70%);
  position: relative;
  overflow: hidden;
}

.chess-entry-card {
  margin-top: 18px;
  padding: 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  border: 1px solid rgba(212, 175, 55, 0.28);
  border-radius: 8px;
  background: rgba(212, 175, 55, 0.08);
}

.chess-entry-card h3 {
  margin: 0 0 6px;
  color: var(--c-white);
  font-size: 1.05rem;
}

.chess-entry-card p {
  margin: 0;
  color: var(--c-white-muted);
  font-size: 0.9rem;
}

@media (max-width: 640px) {
  .chess-entry-card {
    align-items: stretch;
    flex-direction: column;
  }
}

.student-login::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: 
    linear-gradient(rgba(139, 0, 0, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(139, 0, 0, 0.03) 1px, transparent 1px);
  background-size: 50px 50px;
  pointer-events: none;
}

.login-card {
  width: 100%;
  max-width: 440px;
  background: rgba(26, 26, 26, 0.65);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow-lg), 0 0 40px rgba(139, 0, 0, 0.15);
  text-align: center;
  animation: cardFadeIn 0.5s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
  z-index: 2;
}

@keyframes cardFadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

.login-logo {
  width: 80px;
  height: 80px;
  margin: 0 auto 20px;
  filter: drop-shadow(0 4px 12px rgba(139, 0, 0, 0.4));
}

.login-title {
  font-family: var(--font-heading);
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--c-white);
  margin-bottom: 8px;
  letter-spacing: -0.02em;
}

.login-subtitle {
  font-size: 0.9rem;
  color: var(--c-white-dim);
  margin-bottom: 32px;
  line-height: 1.5;
}

.login-error {
  display: none;
  background: rgba(255, 68, 68, 0.1);
  border: 1px solid rgba(255, 68, 68, 0.25);
  color: #ff6b6b;
  padding: 12px 16px;
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  margin-bottom: 24px;
  text-align: left;
  line-height: 1.4;
}

.login-error.show {
  display: block;
  animation: shake 0.4s ease-in-out;
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25%      { transform: translateX(-6px); }
  75%      { transform: translateX(6px); }
}

.form-group {
  margin-bottom: 20px;
  text-align: left;
}

.form-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--c-white-dim);
  margin-bottom: 8px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.input-icon {
  position: absolute;
  left: 16px;
  color: var(--c-white-muted);
  font-size: 1rem;
  pointer-events: none;
  transition: color var(--t-fast);
}

.form-input {
  width: 100%;
  padding: 14px 16px 14px 44px;
  background: rgba(13, 13, 13, 0.6);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  color: var(--c-white);
  font-family: var(--font-body);
  font-size: 0.95rem;
  transition: border-color var(--t-fast), box-shadow var(--t-fast);
}

.form-input:focus {
  outline: none;
  border-color: var(--c-primary-light);
  box-shadow: 0 0 0 3px rgba(139, 0, 0, 0.2);
}

.form-input:focus + .input-icon {
  color: var(--c-primary-light);
}

.btn-toggle-pass {
  position: absolute;
  right: 16px;
  background: none;
  border: none;
  color: var(--c-white-muted);
  font-size: 1rem;
  padding: 4px;
  transition: color var(--t-fast);
}

.btn-toggle-pass:hover {
  color: var(--c-white);
}

.btn-submit {
  width: 100%;
  padding: 14px;
  background: linear-gradient(135deg, var(--c-primary) 0%, #600000 100%);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-md);
  color: var(--c-white);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: transform var(--t-fast), box-shadow var(--t-fast), filter var(--t-fast);
  margin-top: 28px;
}

.btn-submit:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md), var(--c-primary-glow) 0px 8px 24px;
  filter: brightness(1.1);
}

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

.back-link {
  margin-top: 24px;
  font-size: 0.85rem;
}

.back-link a {
  color: var(--c-white-muted);
  transition: color var(--t-fast);
}

.back-link a:hover {
  color: var(--c-primary-light);
}


/* ── Layout Principal Plataforma ─────────────────────────── */
.student-panel-layout {
  display: none; /* Se muestra al autenticar */
  min-height: 100vh;
  background-color: var(--c-dark);
  color: var(--c-white);
  flex-direction: column;
}

.student-panel-layout.visible {
  display: flex;
}

/* Header */
.student-header {
  background: rgba(17, 17, 17, 0.8);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--c-border);
  padding: 16px 40px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.header-logo {
  width: 42px;
  height: 42px;
}

.header-title {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.1;
  color: var(--c-white);
}

.header-title span {
  display: block;
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--c-gold);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-top: 2px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 20px;
}

.welcome-user {
  font-size: 0.95rem;
  color: var(--c-white-dim);
}

.welcome-user strong {
  color: var(--c-white);
}

.btn-logout {
  background: rgba(255, 68, 68, 0.08);
  border: 1px solid rgba(255, 68, 68, 0.2);
  color: var(--c-error);
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 500;
  transition: background var(--t-fast), border-color var(--t-fast);
}

.btn-logout:hover {
  background: rgba(255, 68, 68, 0.16);
  border-color: rgba(255, 68, 68, 0.4);
}


/* Contenedor Principal */
.dashboard-container {
  max-width: 1440px;
  width: 100%;
  margin: 0 auto;
  padding: 24px 40px 40px;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

/* Banner de Clase en Vivo */
.live-banner {
  background: linear-gradient(135deg, rgba(201, 162, 39, 0.15) 0%, rgba(139, 0, 0, 0.15) 100%);
  border: 1px solid rgba(201, 162, 39, 0.35);
  border-radius: var(--radius-md);
  padding: 20px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  box-shadow: var(--shadow-sm), 0 0 15px rgba(201, 162, 39, 0.1);
  animation: pulseGold 3s infinite ease-in-out;
}

.live-banner.hidden {
  display: none !important;
}

@keyframes pulseGold {
  0%, 100% { border-color: rgba(201, 162, 39, 0.35); box-shadow: 0 0 15px rgba(201, 162, 39, 0.1); }
  50%       { border-color: rgba(201, 162, 39, 0.7);  box-shadow: 0 0 25px rgba(201, 162, 39, 0.25); }
}

.live-banner-content {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.live-pulse-container {
  display: flex;
  align-items: center;
  gap: 8px;
}

.live-pulse-dot {
  width: 10px;
  height: 10px;
  background-color: var(--c-error);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--c-error);
  animation: dotPulse 1.2s infinite ease-in-out;
}

@keyframes dotPulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50%       { transform: scale(1.4); opacity: 0.6; }
}

.live-tag {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--c-error);
  background: rgba(255, 68, 68, 0.12);
  padding: 2px 6px;
  border-radius: 4px;
}

.live-text {
  font-size: 0.95rem;
  color: var(--c-white-dim);
}

.btn-join-live {
  flex-shrink: 0;
  animation: btnPulse 2s infinite ease-in-out;
}

@keyframes btnPulse {
  0%, 100% { transform: scale(1); }
  50%       { transform: scale(1.04); }
}


/* Split Layout */
.split-layout {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 32px;
  flex: 1;
}

/* Sidebar de Módulos */
.sidebar-modules {
  background: var(--c-dark-2);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  max-height: calc(100vh - 160px);
  overflow-y: auto;
  position: sticky;
  top: 100px;
}

.sidebar-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--c-white);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--c-border);
  display: flex;
  align-items: center;
  gap: 10px;
}

.modules-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.module-card-item {
  background: var(--c-dark-3);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  padding: 16px;
  text-align: left;
  transition: all var(--t-normal);
  width: 100%;
}

.module-card-item:hover {
  border-color: rgba(255, 255, 255, 0.15);
  background: rgba(255, 255, 255, 0.02);
  transform: translateX(4px);
}

.module-card-item.active {
  border-color: var(--c-primary-light);
  background: rgba(139, 0, 0, 0.08);
  box-shadow: 0 4px 15px rgba(139, 0, 0, 0.1);
}

.module-card-item .mod-number {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--c-gold);
  letter-spacing: 0.05em;
  margin-bottom: 4px;
  display: block;
}

.module-card-item .mod-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--c-white);
  line-height: 1.3;
}

.module-card-item .mod-info {
  font-size: 0.75rem;
  color: var(--c-white-muted);
  margin-top: 8px;
  display: flex;
  align-items: center;
  gap: 4px;
}


/* Skeletons */
.skeleton-module {
  height: 80px;
  background: linear-gradient(90deg, var(--c-dark-3) 25%, var(--c-border) 50%, var(--c-dark-3) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-md);
}

@keyframes shimmer {
  to { background-position: -200% 0; }
}


/* Contenido Principal */
.main-content {
  background: var(--c-dark-2);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  padding: 40px;
  min-height: 500px;
  display: flex;
  flex-direction: column;
}

.welcome-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  flex: 1;
  color: var(--c-white-dim);
  max-width: 500px;
  margin: 0 auto;
  gap: 16px;
}

.welcome-chess-icon {
  font-size: 4rem;
  color: var(--c-primary-light);
  filter: drop-shadow(0 0 15px rgba(139,0,0,0.3));
  margin-bottom: 8px;
}

.welcome-state h2 {
  font-family: var(--font-heading);
  font-size: 1.8rem;
  color: var(--c-white);
}

.welcome-state p {
  font-size: 0.95rem;
  line-height: 1.6;
}


/* Detalle de Módulo Activo */
.module-header {
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--c-border);
}

.module-header-tag {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--c-gold);
  letter-spacing: 0.1em;
  margin-bottom: 6px;
  display: block;
}

.module-header-title {
  font-family: var(--font-heading);
  font-size: 2.2rem;
  color: var(--c-white);
  margin-bottom: 10px;
  line-height: 1.2;
}

.module-header-desc {
  font-size: 0.95rem;
  color: var(--c-white-dim);
  line-height: 1.6;
}

.classes-section-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.classes-grid {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.class-card {
  background: var(--c-dark-3);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  transition: border-color var(--t-fast), transform var(--t-fast);
}

.class-card:hover {
  border-color: rgba(255, 255, 255, 0.1);
  transform: translateY(-2px);
}

.class-card-left {
  display: flex;
  align-items: flex-start;
  gap: 16px;
}

.class-day-badge {
  background: rgba(201, 162, 39, 0.12);
  border: 1px solid rgba(201, 162, 39, 0.25);
  color: var(--c-gold-light);
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  white-space: nowrap;
}

.class-info-block {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.class-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--c-white);
}

.class-desc {
  font-size: 0.85rem;
  color: var(--c-white-muted);
  line-height: 1.5;
}

.btn-watch {
  background: linear-gradient(135deg, var(--c-primary) 0%, #600000 100%);
  color: var(--c-white);
  border: none;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  transition: all var(--t-fast);
}

.btn-watch:hover {
  transform: translateY(-1px);
  filter: brightness(1.1);
}

.badge-no-video {
  color: var(--c-white-muted);
  font-size: 0.8rem;
  border: 1px solid var(--c-border);
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(255,255,255,0.02);
}


/* ── Modal de Video ──────────────────────────────────────── */
.video-modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--t-normal), visibility var(--t-normal);
  padding: 20px;
}

.video-modal-overlay.show {
  opacity: 1;
  visibility: visible;
}

.video-modal {
  width: 100%;
  max-width: 900px;
  background: var(--c-dark-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  transform: scale(0.95);
  transition: transform var(--t-normal);
}

.video-modal-overlay.show .video-modal {
  transform: scale(1);
}

.video-modal-header {
  padding: 18px 24px;
  border-bottom: 1px solid var(--c-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.video-modal-header h3 {
  font-size: 1.15rem;
  font-weight: 600;
}

.btn-close-modal {
  background: none;
  border: none;
  color: var(--c-white-muted);
  font-size: 1.25rem;
  transition: color var(--t-fast);
  padding: 4px;
}

.btn-close-modal:hover {
  color: var(--c-white);
}

.video-modal-body {
  padding: 24px;
}

.video-container {
  position: relative;
  padding-bottom: 56.25%; /* 16:9 ratio */
  height: 0;
  overflow: hidden;
  border-radius: var(--radius-md);
  background: #000;
  margin-bottom: 16px;
  border: 1px solid var(--c-border-2);
}

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

.video-desc {
  font-size: 0.9rem;
  color: var(--c-white-dim);
  line-height: 1.5;
}


/* ── Responsive ─────────────────────────────────────────── */
@media (max-width: 1024px) {
  .split-layout {
    grid-template-columns: 1fr;
  }
  .sidebar-modules {
    position: static;
    max-height: 300px;
  }
}

@media (max-width: 768px) {
  .student-header {
    padding: 16px 20px;
  }
  .dashboard-container {
    padding: 16px 20px 20px;
  }
  .main-content {
    padding: 24px;
  }
  .live-banner {
    flex-direction: column;
    align-items: flex-start;
    padding: 20px;
  }
  .btn-join-live {
    width: 100%;
    justify-content: center;
  }
  .class-card {
    flex-direction: column;
    align-items: flex-start;
  }
  .btn-watch, .badge-no-video {
    width: 100%;
    justify-content: center;
  }
}