/* ============================================================
   KVTOOLS student.css 2026
   Página: /dashboard — Panel del Estudiante
   ============================================================ */

/* --- LAYOUT DEL DASHBOARD --- */
.student-layout {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  min-height: 100vh;
  padding-top: var(--nav-height);
  background: var(--kv-bg-soft);
}

/* SIDEBAR del dashboard */
.student-sidebar {
  position: fixed;
  top: var(--nav-height);
  left: 0;
  width: var(--sidebar-width);
  height: calc(100vh - var(--nav-height));
  background: var(--kv-bg);
  border-right: 1.5px solid var(--kv-border);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  z-index: 50;
}

/* Profile card en el sidebar */
.sidebar-profile {
  padding: var(--space-6);
  border-bottom: 1px solid var(--kv-border);
  text-align: center;
}
.sidebar-avatar {
  width: 60px; height: 60px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--kv-blue), var(--kv-blue-light));
  color: #fff;
  font-size: var(--text-xl);
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-3);
  box-shadow: 0 4px 12px rgba(0,85,184,0.25);
}
.sidebar-name { font-weight: 700; font-size: var(--text-base); margin-bottom: var(--space-1); }
.sidebar-email { font-size: var(--text-sm); color: var(--kv-text-muted); }

/* Streak badge */
.streak-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  background: var(--kv-orange-50);
  border: 1px solid rgba(255,115,0,0.2);
  border-radius: var(--radius-full);
  padding: 0.2rem 0.625rem;
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--kv-orange);
  margin-top: var(--space-2);
}

/* Navegación del sidebar */
.student-sidebar .sidebar-nav { padding: var(--space-4) var(--space-3); flex: 1; }
.sidebar-nav-section { margin-bottom: var(--space-6); }
.sidebar-nav-label {
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--kv-text-muted);
  padding: 0 var(--space-3);
  margin-bottom: var(--space-2);
}
.sidebar-nav-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-3);
  border-radius: var(--radius-md);
  color: var(--kv-text-secondary);
  font-size: var(--text-sm);
  font-weight: 500;
  text-decoration: none;
  transition: var(--transition-fast);
  cursor: pointer;
  border: none;
  background: none;
  width: 100%;
  text-align: left;
  font-family: var(--font-body);
}
.sidebar-nav-item:hover {
  background: var(--kv-blue-50);
  color: var(--kv-blue);
}
.sidebar-nav-item.active {
  background: var(--kv-blue-50);
  color: var(--kv-blue);
  font-weight: 600;
}
.sidebar-nav-item .nav-icon { width: 18px; font-size: 0.9rem; flex-shrink: 0; }
.sidebar-nav-badge {
  margin-left: auto;
  background: var(--kv-orange);
  color: #fff;
  border-radius: var(--radius-full);
  padding: 0.1rem 0.4rem;
  font-size: 0.6rem;
  font-weight: 800;
}

/* --- CONTENIDO PRINCIPAL DEL DASHBOARD --- */
.student-content {
  margin-left: var(--sidebar-width);
  padding: var(--space-8);
  min-height: calc(100vh - var(--nav-height));
}

/* Greeting header */
.dashboard-greeting {
  margin-bottom: var(--space-8);
}
.greeting-text { font-size: var(--text-2xl); font-weight: 800; letter-spacing: -0.02em; }
.greeting-sub  { font-size: var(--text-base); color: var(--kv-text-secondary); margin-top: var(--space-1); }

/* --- KPI CARDS --- */
.kpi-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
  margin-bottom: var(--space-8);
}

.kpi-card {
  background: var(--kv-bg);
  border: 1.5px solid var(--kv-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  position: relative;
  overflow: hidden;
  transition: var(--transition-base);
}
.kpi-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  border-radius: 3px 3px 0 0;
}
.kpi-card.kpi-blue::before   { background: var(--kv-blue); }
.kpi-card.kpi-orange::before { background: var(--kv-orange); }
.kpi-card.kpi-success::before{ background: var(--kv-success); }
.kpi-card.kpi-purple::before { background: #7C3AED; }

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

.kpi-icon {
  width: 36px; height: 36px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  margin-bottom: var(--space-3);
}
.kpi-blue   .kpi-icon { background: var(--kv-blue-50);   color: var(--kv-blue); }
.kpi-orange .kpi-icon { background: var(--kv-orange-50); color: var(--kv-orange); }
.kpi-success .kpi-icon{ background: var(--kv-success-bg);color: var(--kv-success); }
.kpi-purple .kpi-icon { background: #F5F3FF; color: #7C3AED; }

.kpi-number {
  font-size: var(--text-3xl);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1;
  margin-bottom: var(--space-1);
}
.kpi-blue   .kpi-number { color: var(--kv-blue); }
.kpi-orange .kpi-number { color: var(--kv-orange); }
.kpi-success .kpi-number{ color: var(--kv-success); }
.kpi-purple .kpi-number { color: #7C3AED; }

.kpi-label { font-size: var(--text-sm); color: var(--kv-text-muted); }

.kpi-trend {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--kv-success);
}

/* --- MIS CURSOS (grid en dashboard) --- */
.my-courses-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--space-4);
}

.my-course-card {
  background: var(--kv-bg);
  border: 1.5px solid var(--kv-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition-base);
  text-decoration: none;
  display: flex;
  flex-direction: column;
}
.my-course-card:hover {
  border-color: var(--kv-blue);
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}

.my-course-thumb {
  aspect-ratio: 16/9;
  background: linear-gradient(135deg, var(--kv-blue-50), var(--kv-blue-100));
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
}
.my-course-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.my-course-progress-overlay {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  background: rgba(255,255,255,0.95);
  padding: var(--space-2) var(--space-3);
}
.my-course-progress-bar { margin-bottom: var(--space-1); }
.my-course-pct { font-size: 0.65rem; font-weight: 700; color: var(--kv-blue); }

.my-course-body { padding: var(--space-4); flex: 1; }
.my-course-title { font-size: var(--text-sm); font-weight: 700; color: var(--kv-text); margin-bottom: var(--space-2); line-height: 1.35; }
.my-course-meta  { font-size: var(--text-sm); color: var(--kv-text-muted); }

.continue-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3);
  background: var(--kv-blue-50);
  color: var(--kv-blue);
  font-size: var(--text-sm);
  font-weight: 600;
  border-top: 1px solid var(--kv-border);
  transition: background var(--transition-fast);
  text-decoration: none;
}
.my-course-card:hover .continue-btn { background: var(--kv-blue); color: #fff; }

/* ═══════════════════════════════════════
   AULA LAYOUT (UI-005)
   Grid 65%/35% desktop, stack mobile.
   Video + Chat IA visibles simultaneamente.
   ═══════════════════════════════════════ */
.aula-layout {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: 0;
  min-height: 100vh;
}

.aula-main {
  display: flex;
  flex-direction: column;
  background: #0A192F;
  min-height: 100vh;
}

/* Video title bar */
.video-title-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.65rem 1rem;
  background: rgba(255,255,255,0.04);
  color: #fff;
  font-size: var(--text-sm, 0.85rem);
  font-weight: 600;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.video-title-bar .badge {
  font-size: 0.65rem;
  padding: 0.15rem 0.5rem;
  border-radius: 20px;
  background: var(--kv-blue, #0055B8);
  color: #fff;
}

/* Video container */
.video-container {
  background: #000;
  aspect-ratio: 16/9;
  position: relative;
  width: 100%;
  flex-shrink: 0;
}
.video-container iframe { width: 100%; height: 100%; border: none; }

.video-loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  width: 100%;
}

.video-error {
  color: var(--kv-text-muted, #94a3b8);
  text-align: center;
  padding: 2rem;
  font-size: var(--text-sm, 0.85rem);
}

/* Plyr overrides para integrar con design system */
.plyr { --plyr-color-main: var(--kv-blue, #0055B8); }
.plyr__control--overlaid { background: var(--kv-blue, #0055B8); }
.plyr__control--overlaid:hover { background: var(--kv-orange, #FF7300); }

/* Chapter & bookmark markers en la timeline de Plyr */
.chapter-marker {
  position: absolute;
  top: 0;
  width: 3px;
  height: 100%;
  background: var(--kv-orange, #FF7300);
  border-radius: 1px;
  cursor: pointer;
  z-index: 3;
  opacity: 0.85;
  transition: opacity 0.2s, transform 0.2s;
}
.chapter-marker:hover { opacity: 1; transform: scaleX(1.8); }

.bookmark-marker {
  position: absolute;
  top: -2px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  z-index: 4;
  cursor: pointer;
  box-shadow: 0 0 4px rgba(0,0,0,0.3);
  transition: transform 0.2s;
}
.bookmark-marker:hover { transform: scale(1.6); }

/* Chapters bar below video */
.chapters-bar {
  background: rgba(255,255,255,0.04);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  padding: 0.5rem 1rem;
  overflow-x: auto;
}
.chapters-label {
  font-size: 0.6rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: rgba(255,255,255,0.5);
  margin-bottom: 0.35rem;
}
.chapters-list { display: flex; gap: 0.5rem; flex-wrap: wrap; }
.chapter-item {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.25rem 0.6rem;
  background: rgba(255,255,255,0.08);
  border-radius: 4px;
  cursor: pointer;
  transition: background 0.2s;
  white-space: nowrap;
}
.chapter-item:hover { background: rgba(0,85,184,0.4); }
.chapter-time {
  font-size: 0.65rem;
  font-weight: 600;
  color: var(--kv-orange, #FF7300);
  font-family: var(--font-mono, 'JetBrains Mono', monospace);
}
.chapter-title { font-size: 0.72rem; color: rgba(255,255,255,0.85); }

/* ═══ LESSON NAVIGATION (in sidebar) ═══ */
.lesson-nav {
  border-top: 1px solid var(--kv-border, #e2e8f0);
  flex: 1;
  overflow-y: auto;
}
.lesson-nav-header {
  padding: 0.65rem 1rem;
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--kv-text-muted, #94a3b8);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}
.lesson-count {
  background: var(--kv-blue-50, #eef2ff);
  color: var(--kv-blue, #0055B8);
  font-size: 0.6rem;
  padding: 0.1rem 0.4rem;
  border-radius: 10px;
}
.lesson-nav-list { padding-bottom: 1rem; }

.lesson-sidebar-item {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.55rem 1rem;
  cursor: pointer;
  transition: background 0.15s;
  border-left: 3px solid transparent;
}
.lesson-sidebar-item:hover { background: var(--kv-bg-soft, #f8fafc); }
.lesson-sidebar-item.active {
  background: var(--kv-blue-50, #eef2ff);
  border-left-color: var(--kv-blue, #0055B8);
}
.lesson-sidebar-item.completed .lesson-num {
  background: var(--kv-success, #16a34a);
  color: #fff;
}

.lesson-sidebar-item .lesson-num {
  width: 22px; height: 22px;
  border-radius: 50%;
  background: var(--kv-bg-muted, #f1f5f9);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.6rem;
  font-weight: 700;
  color: var(--kv-text-muted, #94a3b8);
  flex-shrink: 0;
}
.lesson-sidebar-item.active .lesson-num {
  background: var(--kv-blue, #0055B8);
  color: #fff;
}

.lesson-meta { flex: 1; min-width: 0; }
.lesson-title {
  font-size: 0.75rem;
  color: var(--kv-text, #1e293b);
  line-height: 1.3;
  display: block;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ═══ AULA SIDEBAR (tabbed) ═══ */
.aula-sidebar {
  background: var(--kv-bg, #ffffff);
  border-left: 1.5px solid var(--kv-border, #e2e8f0);
  display: flex;
  flex-direction: column;
  height: 100vh;
  position: sticky;
  top: 0;
}

.aula-tabs {
  display: flex;
  border-bottom: 1.5px solid var(--kv-border, #e2e8f0);
  background: var(--kv-bg-soft, #f8fafc);
  flex-shrink: 0;
}
.aula-tab {
  flex: 1;
  padding: 0.7rem 0.5rem;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--kv-text-muted, #94a3b8);
  border: none;
  background: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.3rem;
  border-bottom: 2px solid transparent;
  transition: color 0.2s, border-color 0.2s;
  font-family: var(--font-body, 'Inter', sans-serif);
}
.aula-tab:hover { color: var(--kv-blue, #0055B8); }
.aula-tab.active {
  color: var(--kv-blue, #0055B8);
  border-bottom-color: var(--kv-blue, #0055B8);
  background: var(--kv-bg, #ffffff);
}

.aula-tab-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* ═══ TAB: Chat IA (UI-006) ═══ */
.chat-scope-toggle {
  display: flex;
  padding: 0.5rem;
  gap: 0.35rem;
  border-bottom: 1px solid var(--kv-border, #e2e8f0);
  flex-shrink: 0;
}
.chat-scope-btn {
  flex: 1;
  padding: 0.4rem 0.5rem;
  font-size: 0.68rem;
  font-weight: 600;
  border: 1.5px solid var(--kv-border, #e2e8f0);
  border-radius: 6px;
  background: var(--kv-bg, #ffffff);
  color: var(--kv-text-muted, #94a3b8);
  cursor: pointer;
  transition: all 0.2s;
  font-family: var(--font-body, 'Inter', sans-serif);
}
.chat-scope-btn:hover { border-color: var(--kv-blue, #0055B8); color: var(--kv-blue, #0055B8); }
.chat-scope-btn.active {
  background: var(--kv-blue-50, #eef2ff);
  border-color: var(--kv-blue, #0055B8);
  color: var(--kv-blue, #0055B8);
}

/* Chat messages area */
.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  background: var(--kv-bg-soft, #f8fafc);
}

/* User message bubble */
.msg { max-width: 100%; }
.msg-user {
  display: flex;
  justify-content: flex-end;
}
.msg-user .msg-content {
  background: var(--kv-blue, #0055B8);
  color: #fff;
  border-radius: 12px 12px 2px 12px;
  padding: 0.6rem 0.85rem;
  max-width: 85%;
  font-size: 0.8rem;
  line-height: 1.55;
  word-wrap: break-word;
}

/* Assistant message bubble */
.msg-assistant {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}
.msg-assistant .msg-content {
  background: var(--kv-bg, #ffffff);
  border: 1.5px solid var(--kv-border, #e2e8f0);
  border-left: 3px solid var(--kv-blue, #0055B8);
  border-radius: 2px 12px 12px 12px;
  padding: 0.6rem 0.85rem;
  max-width: 95%;
  font-size: 0.8rem;
  line-height: 1.65;
  word-wrap: break-word;
}
.msg-assistant.msg-system .msg-content {
  border-left-color: var(--kv-warning, #d97706);
  background: #fffbeb;
}

/* Markdown rendering inside messages */
.msg-text { overflow-wrap: break-word; }
.msg-text strong { font-weight: 700; }
.msg-text em { font-style: italic; }
.msg-text .msg-code-block {
  background: #1e293b;
  color: #e2e8f0;
  border-radius: 6px;
  padding: 0.6rem 0.75rem;
  font-size: 0.72rem;
  font-family: var(--font-mono, 'JetBrains Mono', monospace);
  overflow-x: auto;
  margin: 0.5rem 0;
}
.msg-text .msg-inline-code {
  background: var(--kv-bg-muted, #f1f5f9);
  padding: 0.1rem 0.35rem;
  border-radius: 3px;
  font-size: 0.75rem;
  font-family: var(--font-mono, 'JetBrains Mono', monospace);
}
.msg-text .msg-list {
  list-style: none;
  padding-left: 0.5rem;
  margin: 0.4rem 0;
}
.msg-text .msg-list-item {
  padding: 0.15rem 0;
  font-size: 0.8rem;
}
.msg-text .msg-list-item.numbered .list-num {
  color: var(--kv-blue, #0055B8);
  font-weight: 700;
  margin-right: 0.3rem;
}
.msg-text .msg-list-item.bullet::before {
  content: '\2022';
  color: var(--kv-blue, #0055B8);
  margin-right: 0.4rem;
  font-weight: 700;
}
.msg-text .msg-divider {
  border: none;
  border-top: 1px solid var(--kv-border, #e2e8f0);
  margin: 0.5rem 0;
}

/* Citation superscripts */
.cite-ref {
  color: var(--kv-blue, #0055B8);
  font-weight: 700;
  cursor: pointer;
  text-decoration: underline;
  text-decoration-style: dotted;
  transition: color 0.2s;
}
.cite-ref:hover, .cite-ref.cite-highlight {
  color: var(--kv-orange, #FF7300);
}

/* Extended knowledge badge */
.msg-extended-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  background: linear-gradient(135deg, #fef3c7, #fff7ed);
  border: 1px solid #fcd34d;
  border-radius: 4px;
  padding: 0.15rem 0.5rem;
  font-size: 0.62rem;
  font-weight: 600;
  color: #92400e;
  margin-bottom: 0.4rem;
}
.extended-icon { display: flex; color: #f59e0b; }

/* Citations container */
.citations-container {
  padding: 0 0.85rem 0.5rem;
}
.citations-label {
  font-size: 0.62rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--kv-text-muted, #94a3b8);
  margin-bottom: 0.35rem;
}
.citation-card {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.5rem;
  margin-bottom: 0.25rem;
  background: var(--kv-bg-soft, #f8fafc);
  border: 1px solid var(--kv-border, #e2e8f0);
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s;
  font-size: 0.7rem;
}
.citation-card:hover { border-color: var(--kv-blue, #0055B8); background: var(--kv-blue-50, #eef2ff); }
.citation-card.citation-highlight { border-color: var(--kv-orange, #FF7300); background: #fff7ed; }
.citation-card.citation-active {
  border-color: var(--kv-blue, #0055B8);
  box-shadow: 0 0 0 2px rgba(0,85,184,0.2);
}
.citation-badge {
  width: 18px; height: 18px;
  border-radius: 50%;
  background: var(--kv-blue, #0055B8);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.55rem;
  font-weight: 800;
  flex-shrink: 0;
}
.citation-module { color: var(--kv-text, #1e293b); font-weight: 600; flex: 1; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.citation-time { color: var(--kv-orange, #FF7300); font-weight: 600; font-family: var(--font-mono, monospace); font-size: 0.62rem; flex-shrink: 0; }
.citation-quote { display: none; }
.citation-play {
  display: flex;
  align-items: center;
  gap: 0.2rem;
  color: var(--kv-blue, #0055B8);
  font-weight: 600;
  font-size: 0.6rem;
  flex-shrink: 0;
  white-space: nowrap;
}

/* Feedback buttons */
.feedback-btns {
  display: flex;
  gap: 0.35rem;
  padding: 0.2rem 0.85rem;
}
.fb-btn {
  width: 26px; height: 26px;
  border: 1px solid var(--kv-border, #e2e8f0);
  border-radius: 50%;
  background: var(--kv-bg, #ffffff);
  color: var(--kv-text-muted, #94a3b8);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s;
}
.fb-btn:hover { border-color: var(--kv-blue, #0055B8); color: var(--kv-blue, #0055B8); }
.fb-btn.selected { background: var(--kv-blue, #0055B8); color: #fff; border-color: var(--kv-blue, #0055B8); }

/* Latency meta */
.msg-meta {
  font-size: 0.6rem;
  color: var(--kv-text-muted, #94a3b8);
  padding: 0 0.85rem;
}

/* Typing indicator */
.typing-indicator {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 0.5rem 0.85rem;
}
.typing-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--kv-text-muted, #94a3b8);
  animation: typing-bounce 1.4s infinite ease-in-out;
}
.typing-dot:nth-child(2) { animation-delay: 0.16s; }
.typing-dot:nth-child(3) { animation-delay: 0.32s; }
@keyframes typing-bounce {
  0%, 60%, 100% { transform: translateY(0); opacity: 0.4; }
  30% { transform: translateY(-6px); opacity: 1; }
}

/* Error message with retry */
.msg-error {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 0.85rem;
  background: #fef2f2;
  border: 1px solid #fecaca;
  border-radius: 8px;
  font-size: 0.78rem;
  color: #991b1b;
}
.msg-error .error-icon { flex-shrink: 0; color: #dc2626; }
.btn-retry {
  margin-left: auto;
  padding: 0.25rem 0.65rem;
  font-size: 0.7rem;
  font-weight: 600;
  border: 1px solid #dc2626;
  border-radius: 4px;
  background: #fff;
  color: #dc2626;
  cursor: pointer;
  transition: all 0.2s;
  font-family: var(--font-body, 'Inter', sans-serif);
  flex-shrink: 0;
}
.btn-retry:hover { background: #dc2626; color: #fff; }

/* Chat welcome & suggestion chips */
.chat-welcome {
  text-align: center;
  padding: 1.5rem 1rem;
}
.chat-welcome-icon {
  width: 48px; height: 48px;
  margin: 0 auto 0.75rem;
  background: var(--kv-blue-50, #eef2ff);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--kv-blue, #0055B8);
}
.chat-welcome h3 {
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: 0.35rem;
}
.chat-welcome p {
  font-size: 0.75rem;
  color: var(--kv-text-secondary, #64748b);
  line-height: 1.5;
  margin-bottom: 0.75rem;
}
.chat-suggestions { display: flex; flex-wrap: wrap; gap: 0.35rem; justify-content: center; }
.suggestion-chip {
  padding: 0.3rem 0.65rem;
  font-size: 0.68rem;
  font-weight: 500;
  border: 1.5px solid var(--kv-border, #e2e8f0);
  border-radius: 20px;
  background: var(--kv-bg, #ffffff);
  color: var(--kv-blue, #0055B8);
  cursor: pointer;
  transition: all 0.2s;
  font-family: var(--font-body, 'Inter', sans-serif);
}
.suggestion-chip:hover {
  background: var(--kv-blue, #0055B8);
  color: #fff;
  border-color: var(--kv-blue, #0055B8);
}

/* Chat input area */
.chat-input-area {
  padding: 0.5rem;
  border-top: 1px solid var(--kv-border, #e2e8f0);
  display: flex;
  gap: 0.35rem;
  align-items: flex-end;
  background: var(--kv-bg, #ffffff);
  flex-shrink: 0;
}
.chat-input-area textarea {
  flex: 1;
  padding: 0.5rem 0.75rem;
  border: 1.5px solid var(--kv-border, #e2e8f0);
  border-radius: 8px;
  font-family: var(--font-body, 'Inter', sans-serif);
  font-size: 0.8rem;
  outline: none;
  resize: none;
  max-height: 120px;
  transition: border-color 0.2s;
}
.chat-input-area textarea:focus { border-color: var(--kv-blue, #0055B8); }

/* ═══ TAB: Notas & Marcadores ═══ */
.notes-toolbar {
  display: flex;
  gap: 0.35rem;
  padding: 0.6rem;
  border-bottom: 1px solid var(--kv-border, #e2e8f0);
  flex-shrink: 0;
}
.notes-input-area {
  padding: 0.6rem;
  border-bottom: 1px solid var(--kv-border, #e2e8f0);
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  flex-shrink: 0;
}
.note-ts-badge {
  font-size: 0.65rem;
  font-weight: 700;
  color: var(--kv-orange, #FF7300);
  font-family: var(--font-mono, monospace);
}
.notes-input-area textarea {
  width: 100%;
  padding: 0.45rem 0.65rem;
  border: 1.5px solid var(--kv-border, #e2e8f0);
  border-radius: 6px;
  font-family: var(--font-body, 'Inter', sans-serif);
  font-size: 0.78rem;
  resize: none;
  outline: none;
}
.notes-input-area textarea:focus { border-color: var(--kv-blue, #0055B8); }

.notes-section-label {
  font-size: 0.62rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--kv-text-muted, #94a3b8);
  padding: 0.5rem 0.75rem 0.25rem;
}

.notes-list, .bookmarks-list {
  overflow-y: auto;
  flex: 1;
  min-height: 0;
}

.note-item, .bookmark-item {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  padding: 0.5rem 0.75rem;
  border-bottom: 1px solid var(--kv-border, #e2e8f0);
  transition: background 0.15s;
}
.note-item:hover, .bookmark-item:hover { background: var(--kv-bg-soft, #f8fafc); }

.note-time, .bookmark-time {
  font-size: 0.65rem;
  font-weight: 700;
  font-family: var(--font-mono, monospace);
  color: var(--kv-blue, #0055B8);
  cursor: pointer;
  flex-shrink: 0;
  padding-top: 1px;
}
.note-time:hover, .bookmark-time:hover { text-decoration: underline; }

.note-body, .bookmark-label {
  font-size: 0.75rem;
  color: var(--kv-text, #1e293b);
  flex: 1;
  line-height: 1.4;
  word-break: break-word;
}

.note-del, .bookmark-del {
  border: none;
  background: none;
  color: var(--kv-text-muted, #94a3b8);
  cursor: pointer;
  font-size: 0.9rem;
  padding: 0;
  line-height: 1;
  flex-shrink: 0;
  transition: color 0.2s;
}
.note-del:hover, .bookmark-del:hover { color: var(--kv-danger, #dc2626); }

.tab-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  padding: 2rem 1rem;
  text-align: center;
  color: var(--kv-text-muted, #94a3b8);
}
.tab-empty p { font-size: 0.75rem; line-height: 1.4; }
.tab-empty svg { opacity: 0.4; }

/* ═══ LEGACY COMPAT ═══ */
.lesson-layout {
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: var(--space-6, 1.5rem);
  min-height: calc(100vh - var(--nav-height, 56px) - 4rem);
}
.lesson-sidebar-panel {
  background: var(--kv-bg, #ffffff);
  border: 1.5px solid var(--kv-border, #e2e8f0);
  border-radius: var(--radius-lg, 12px);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  max-height: calc(100vh - var(--nav-height, 56px) - 4rem);
}
.lesson-list { overflow-y: auto; flex: 1; }
.lesson-list-item {
  display: flex; align-items: center; gap: 0.75rem;
  padding: 0.75rem 1.25rem; border-bottom: 1px solid var(--kv-border, #e2e8f0);
  cursor: pointer; transition: background 0.15s;
}
.lesson-list-item:hover { background: var(--kv-bg-soft, #f8fafc); }
.lesson-list-title { font-size: var(--text-sm, 0.85rem); color: var(--kv-text, #1e293b); flex: 1; }
.lesson-list-duration { font-size: var(--text-sm, 0.85rem); color: var(--kv-text-muted, #94a3b8); flex-shrink: 0; }

/* --- CHAT IA (tutor) --- */
.ai-chat-container {
  background: var(--kv-bg);
  border: 1.5px solid var(--kv-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  height: 480px;
}

.ai-chat-header {
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--kv-border);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  background: linear-gradient(135deg, var(--kv-blue-50), var(--kv-bg));
}
.ai-chat-avatar {
  width: 34px; height: 34px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--kv-blue), var(--kv-blue-light));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 0.75rem;
  font-weight: 800;
  flex-shrink: 0;
}
.ai-chat-title { font-weight: 700; font-size: var(--text-sm); }
.ai-chat-subtitle { font-size: 0.65rem; color: var(--kv-success); display: flex; align-items: center; gap: 3px; }
.ai-status-dot { width: 6px; height: 6px; background: var(--kv-success); border-radius: 50%; animation: pulse-dot 2s infinite; }
@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.4; }
}

.ai-messages {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  background: var(--kv-bg-soft);
}

/* Mensaje de usuario */
.ai-msg-user { display: flex; justify-content: flex-end; }
.ai-msg-user .bubble {
  background: var(--kv-blue);
  color: #fff;
  border-radius: var(--radius-lg) var(--radius-lg) var(--radius-sm) var(--radius-lg);
  padding: var(--space-3) var(--space-4);
  max-width: 80%;
  font-size: var(--text-sm);
  line-height: 1.5;
}

/* Mensaje del asistente */
.ai-msg-bot { display: flex; gap: var(--space-2); align-items: flex-start; }
.ai-msg-bot .bot-avatar {
  width: 28px; height: 28px;
  background: linear-gradient(135deg, var(--kv-orange), var(--kv-orange-light));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 0.65rem;
  font-weight: 800;
  flex-shrink: 0;
  margin-top: 2px;
}
.ai-msg-bot .bubble {
  background: var(--kv-bg);
  border: 1.5px solid var(--kv-border);
  border-left: 3px solid var(--kv-orange);
  border-radius: var(--radius-sm) var(--radius-lg) var(--radius-lg) var(--radius-lg);
  padding: var(--space-3) var(--space-4);
  max-width: 85%;
  font-size: var(--text-sm);
  line-height: 1.6;
}

/* Cita / source del bot */
.ai-citation {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  font-size: 0.65rem;
  color: var(--kv-blue);
  margin-top: var(--space-2);
  cursor: pointer;
  background: var(--kv-blue-50);
  border-radius: var(--radius-sm);
  padding: 0.2rem 0.5rem;
  width: fit-content;
}
.ai-citation:hover { background: var(--kv-blue-100); }

/* Input del chat */
.ai-chat-input-bar {
  padding: var(--space-3) var(--space-4);
  border-top: 1px solid var(--kv-border);
  display: flex;
  gap: var(--space-2);
  align-items: center;
  background: var(--kv-bg);
}
.ai-chat-input {
  flex: 1;
  padding: 0.6rem 1rem;
  border: 1.5px solid var(--kv-border);
  border-radius: var(--radius-full);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  outline: none;
  transition: border-color var(--transition-fast);
}
.ai-chat-input:focus { border-color: var(--kv-blue); }
.ai-send-btn {
  width: 36px; height: 36px;
  background: var(--kv-blue);
  color: #fff;
  border: none;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 0.9rem;
  transition: var(--transition-bounce);
  flex-shrink: 0;
}
.ai-send-btn:hover { background: var(--kv-blue-dark); transform: scale(1.08); }

/* --- ESTILOS EXISTENTES PRESERVADOS (stats, streak, heatmap, badges, forum, calendar) --- */

/* Stats grid (legacy/compat) */
.stu-stats {
    display: grid; grid-template-columns: repeat(5, 1fr);
    gap: 1rem; margin-bottom: 2rem;
}
.stu-stat-card {
    background: var(--kv-bg); border: 1.5px solid var(--kv-border);
    border-radius: var(--radius-lg);
    padding: 1.25rem; text-align: center;
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}
.stu-stat-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.stu-stat-icon {
    width: 40px; height: 40px; border-radius: 10px;
    display: inline-flex; align-items: center; justify-content: center;
    margin-bottom: 0.6rem;
}
.stu-stat-icon.hours { background: rgba(0,85,184,0.1); color: var(--kv-blue); }
.stu-stat-icon.streak { background: rgba(255,115,0,0.1); color: var(--kv-orange); }
.stu-stat-icon.courses { background: rgba(22,163,106,0.1); color: var(--kv-success); }
.stu-stat-icon.score { background: rgba(139,92,246,0.12); color: #8b5cf6; }
.stu-stat-icon.rank { background: rgba(236,72,153,0.1); color: #ec4899; }
.stu-stat-value {
    font-size: 1.6rem; font-weight: 800; line-height: 1.2;
    color: var(--kv-text); margin-bottom: 0.15rem;
}
.stu-stat-label { font-size: 0.72rem; color: var(--kv-text-muted); font-weight: 500; }

/* Streak indicator */
.stu-streak-bar {
    display: flex; align-items: center; gap: 0.75rem;
    background: var(--kv-bg); border: 1.5px solid var(--kv-border);
    border-radius: var(--radius-lg); padding: var(--space-4) var(--space-5);
    margin-bottom: 1.5rem;
}
.stu-streak-fire { font-size: 1.5rem; }
.stu-streak-info { flex: 1; }
.stu-streak-info strong { color: var(--kv-orange); font-size: 1.1rem; }
.stu-streak-info span { font-size: 0.78rem; color: var(--kv-text-muted); display: block; margin-top: 0.15rem; }
.stu-streak-dots { display: flex; gap: 3px; }
.stu-streak-dot {
    width: 22px; height: 22px; border-radius: 4px;
    display: flex; align-items: center; justify-content: center;
    font-size: 0.65rem; font-weight: 700;
    border: 1px solid var(--kv-border);
    background: var(--kv-bg);
    color: var(--kv-text-muted);
    transition: all var(--transition-fast);
}
.stu-streak-dot.active { background: var(--kv-orange); color: #fff; border-color: var(--kv-orange); }

/* LMS-004: "Continuar donde dejaste" CTA */
.stu-continue-card {
    display: flex; align-items: center; gap: 1rem;
    background: linear-gradient(135deg, rgba(0,85,184,0.06) 0%, rgba(0,85,184,0.02) 100%);
    border: 1.5px solid var(--kv-blue);
    border-radius: var(--radius-lg);
    padding: var(--space-4) var(--space-5);
    margin-bottom: 1.5rem;
    cursor: pointer;
    transition: all 300ms cubic-bezier(0.4,0,0.2,1);
}
.stu-continue-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0,85,184,0.15);
    border-color: var(--kv-blue);
}
.stu-continue-icon {
    width: 48px; height: 48px; border-radius: 12px;
    background: rgba(0,85,184,0.1);
    display: flex; align-items: center; justify-content: center;
    flex-shrink: 0;
}
.stu-continue-info { flex: 1; min-width: 0; }
.stu-continue-label {
    font-size: 0.7rem; font-weight: 600; text-transform: uppercase;
    letter-spacing: 0.5px; color: var(--kv-blue); display: block; margin-bottom: 0.15rem;
}
.stu-continue-title {
    font-size: 1rem; font-weight: 700; color: var(--kv-text);
    display: block; white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.stu-continue-module {
    font-size: 0.78rem; color: var(--kv-text-muted); display: block; margin-top: 0.1rem;
    white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.stu-continue-progress { text-align: center; flex-shrink: 0; }
.stu-continue-pct { font-size: 1.1rem; font-weight: 800; color: var(--kv-blue); margin-bottom: 0.25rem; }
.stu-continue-arrow { color: var(--kv-blue); opacity: 0.5; flex-shrink: 0; }
.stu-continue-card:hover .stu-continue-arrow { opacity: 1; transform: translateX(3px); transition: all 200ms; }

/* LMS-004: Actividad reciente */
.stu-section-header {
    display: flex; align-items: center; gap: 0.5rem;
    font-size: 0.88rem; font-weight: 700; color: var(--kv-text);
    margin-bottom: 0.75rem;
}
.stu-section-header svg { color: var(--kv-text-muted); }
.stu-activity-list {
    background: var(--kv-bg); border: 1.5px solid var(--kv-border);
    border-radius: var(--radius-lg); padding: 0.25rem 0;
    margin-bottom: 1.5rem; max-height: 320px; overflow-y: auto;
}
.stu-activity-row {
    display: flex; align-items: center; gap: 0.65rem;
    padding: 0.65rem 1rem;
    border-bottom: 1px solid rgba(0,0,0,0.04);
    font-size: 0.82rem; transition: background 150ms;
}
.stu-activity-row:last-child { border-bottom: none; }
.stu-activity-row:hover { background: rgba(0,85,184,0.03); }
.stu-activity-icon { flex-shrink: 0; width: 20px; display: flex; align-items: center; justify-content: center; }
.stu-activity-desc { flex: 1; min-width: 0; color: var(--kv-text-secondary); line-height: 1.4; }
.stu-activity-desc strong { color: var(--kv-text); font-weight: 600; }
.stu-activity-course {
    display: inline-block; font-size: 0.68rem; color: var(--kv-text-muted);
    background: rgba(0,0,0,0.04); padding: 0.1rem 0.4rem; border-radius: 3px;
    margin-left: 0.25rem; vertical-align: middle;
}
.stu-activity-time {
    font-size: 0.7rem; color: var(--kv-text-muted); white-space: nowrap; flex-shrink: 0;
}

/* ===== FORUM ===== */
.forum-header {
    display: flex; justify-content: space-between; align-items: center;
    margin-bottom: 1rem; flex-wrap: wrap; gap: 0.5rem;
}
.forum-header h2 { font-size: 1.05rem; font-weight: 700; color: var(--kv-text); margin: 0; }
.forum-toolbar {
    display: flex; gap: 0.75rem; align-items: center;
    margin-bottom: 1rem; flex-wrap: wrap;
}
.forum-threads { display: flex; flex-direction: column; gap: 0.5rem; }
.forum-thread {
    display: flex; gap: 0.75rem; align-items: flex-start;
    background: var(--kv-bg); border: 1.5px solid var(--kv-border);
    border-radius: var(--radius-lg);
    padding: 0.85rem 1rem; cursor: pointer;
    transition: all var(--transition-base);
}
.forum-thread:hover {
    border-color: var(--kv-blue);
    box-shadow: 0 2px 8px rgba(0,85,184,0.08);
    transform: translateY(-1px);
}
.forum-thread.pinned { border-left: 3px solid var(--kv-orange); }
.forum-votes {
    display: flex; flex-direction: column; align-items: center;
    gap: 2px; flex-shrink: 0; min-width: 32px;
}
.forum-vote-btn {
    background: none; border: none; cursor: pointer; padding: 2px;
    font-size: 0.85rem; color: var(--kv-text-muted);
    transition: color 150ms;
    line-height: 1;
}
.forum-vote-btn:hover { color: var(--kv-blue); }
.forum-vote-btn.voted-up { color: var(--kv-blue); font-weight: 700; }
.forum-vote-btn.voted-down { color: var(--danger, #dc2626); font-weight: 700; }
.forum-vote-count { font-size: 0.82rem; font-weight: 700; color: var(--kv-text); }
.forum-thread-body { flex: 1; min-width: 0; }
.forum-thread-title {
    font-size: 0.9rem; font-weight: 600; color: var(--kv-text);
    margin-bottom: 0.25rem; line-height: 1.3;
}
.forum-thread-excerpt {
    font-size: 0.78rem; color: var(--kv-text-muted);
    line-height: 1.4; margin-bottom: 0.35rem;
    display: -webkit-box; -webkit-line-clamp: 2;
    -webkit-box-orient: vertical; overflow: hidden;
}
.forum-thread-meta {
    display: flex; gap: 0.75rem; align-items: center;
    font-size: 0.72rem; color: var(--kv-text-muted);
}
.forum-thread-meta svg { width: 12px; height: 12px; vertical-align: -1px; margin-right: 2px; }
.pin-tag {
    display: inline-block; background: var(--kv-orange);
    color: #fff; font-size: 0.62rem; font-weight: 700;
    padding: 0.1rem 0.4rem; border-radius: 3px;
    margin-right: 0.3rem; vertical-align: 1px;
    text-transform: uppercase; letter-spacing: 0.3px;
}

/* Forum detail */
.forum-detail-back {
    background: none; border: none; cursor: pointer;
    font-size: 0.82rem; color: var(--kv-blue); font-weight: 600;
    padding: 0.4rem 0; margin-bottom: 1rem; display: inline-block;
    transition: opacity 150ms;
}
.forum-detail-back:hover { opacity: 0.7; }
.forum-post {
    background: var(--kv-bg); border: 1.5px solid var(--kv-border);
    border-radius: var(--radius-lg); padding: 1.25rem;
    margin-bottom: 0.5rem;
}
.forum-post.best-answer { border-color: var(--kv-success, #16a34a); background: rgba(22,163,106,0.03); }
.forum-post-header {
    display: flex; justify-content: space-between; align-items: center;
    margin-bottom: 0.75rem; flex-wrap: wrap; gap: 0.5rem;
}
.forum-post-author { display: flex; align-items: center; gap: 0.5rem; }
.forum-avatar {
    width: 32px; height: 32px; border-radius: 50%;
    background: var(--kv-blue); color: #fff;
    display: flex; align-items: center; justify-content: center;
    font-weight: 700; font-size: 0.75rem; flex-shrink: 0;
}
.forum-author-name { font-size: 0.85rem; font-weight: 600; color: var(--kv-text); }
.forum-post-time { font-size: 0.72rem; color: var(--kv-text-muted); }
.forum-post-content {
    font-size: 0.85rem; color: var(--kv-text-secondary, var(--kv-text));
    line-height: 1.6; margin-bottom: 0.75rem;
    white-space: pre-wrap; word-break: break-word;
}
.forum-post-actions { display: flex; gap: 0.5rem; align-items: center; }
.forum-action-btn {
    background: none; border: 1px solid var(--kv-border); border-radius: 6px;
    cursor: pointer; padding: 0.25rem 0.6rem; font-size: 0.78rem;
    color: var(--kv-text-muted); transition: all 150ms;
}
.forum-action-btn:hover { background: rgba(0,85,184,0.05); border-color: var(--kv-blue); color: var(--kv-blue); }
.forum-action-btn.voted-up { background: rgba(0,85,184,0.08); border-color: var(--kv-blue); color: var(--kv-blue); }
.forum-action-btn.voted-down { background: rgba(220,38,38,0.06); border-color: var(--danger, #dc2626); color: var(--danger, #dc2626); }

.forum-reply-form {
    background: var(--kv-bg); border: 1.5px solid var(--kv-border);
    border-radius: var(--radius-lg); padding: var(--space-4) var(--space-5);
    margin-top: 1.5rem;
}
.forum-reply-form textarea {
    width: 100%; min-height: 80px; resize: vertical;
    background: var(--kv-bg-input, var(--kv-bg)); border: 1.5px solid var(--kv-border);
    border-radius: var(--radius-md, 8px); padding: 0.75rem;
    font-size: 0.85rem; font-family: inherit; color: var(--kv-text);
    transition: border-color 150ms;
}
.forum-reply-form textarea:focus { outline: none; border-color: var(--kv-blue); }

.forum-pagination {
    display: flex; justify-content: center; gap: 0.35rem;
    margin-top: 1.25rem; padding-top: 1rem;
    border-top: 1px solid var(--kv-border);
}
.forum-page-btn {
    background: var(--kv-bg); border: 1px solid var(--kv-border);
    border-radius: 6px; padding: 0.3rem 0.7rem; cursor: pointer;
    font-size: 0.78rem; color: var(--kv-text-muted);
    transition: all 150ms;
}
.forum-page-btn:hover { border-color: var(--kv-blue); color: var(--kv-blue); }
.forum-page-btn.active { background: var(--kv-blue); color: #fff; border-color: var(--kv-blue); }

.forum-mark-best {
    font-size: 0.72rem; background: none; border: 1px solid var(--kv-border);
    border-radius: 4px; padding: 0.15rem 0.5rem; cursor: pointer;
    color: var(--kv-text-muted); transition: all 150ms;
}
.forum-mark-best:hover { border-color: var(--kv-success, #16a34a); color: var(--kv-success, #16a34a); }

/* Forum modal */
.forum-modal-overlay {
    position: fixed; inset: 0; background: rgba(0,0,0,0.45);
    z-index: 9000; display: flex; align-items: center; justify-content: center;
    opacity: 0; transition: opacity 200ms; pointer-events: none;
}
.forum-modal-overlay.open { opacity: 1; pointer-events: auto; }
.forum-modal {
    background: var(--kv-bg); border-radius: var(--radius-lg);
    padding: 1.5rem; max-width: 520px; width: 90%;
    box-shadow: 0 16px 48px rgba(0,0,0,0.15);
    max-height: 80vh; overflow-y: auto;
}
.forum-modal input[type="text"],
.forum-modal textarea {
    width: 100%; background: var(--kv-bg-input, var(--kv-bg));
    border: 1.5px solid var(--kv-border); border-radius: var(--radius-md, 8px);
    padding: 0.75rem; font-size: 0.85rem; font-family: inherit;
    color: var(--kv-text); margin-bottom: 0.75rem;
    transition: border-color 150ms;
}
.forum-modal input[type="text"]:focus,
.forum-modal textarea:focus { outline: none; border-color: var(--kv-blue); }
.forum-modal textarea { min-height: 120px; resize: vertical; }

/* ===== CALENDAR / EVENTS ===== */
.cal-header {
    display: flex; justify-content: space-between; align-items: center;
    margin-bottom: 1.25rem; flex-wrap: wrap; gap: 0.75rem;
}
.cal-header h2 { font-size: 1.05rem; font-weight: 700; color: var(--kv-text); margin: 0; }
.cal-tabs { display: flex; gap: 0.25rem; }
.cal-tab {
    background: none; border: 1px solid var(--kv-border); border-radius: 6px;
    padding: 0.35rem 0.85rem; font-size: 0.78rem; font-weight: 600;
    cursor: pointer; color: var(--kv-text-muted); font-family: inherit;
    transition: all 150ms;
}
.cal-tab:hover { border-color: var(--kv-blue); color: var(--kv-blue); }
.cal-tab.active { background: var(--kv-blue); color: #fff; border-color: var(--kv-blue); }
.stu-two-col {
    display: grid; grid-template-columns: 1fr 280px; gap: 1.25rem;
}
.cal-events { display: flex; flex-direction: column; gap: 0.6rem; }
.cal-event {
    display: flex; gap: 0.85rem; align-items: flex-start;
    background: var(--kv-bg); border: 1.5px solid var(--kv-border);
    border-radius: var(--radius-lg); padding: var(--space-4);
    transition: all var(--transition-base);
}
.cal-event:hover { border-color: var(--kv-blue); box-shadow: 0 2px 8px rgba(0,85,184,0.06); }
.cal-event.past { opacity: 0.6; }
.cal-event-date {
    flex-shrink: 0; width: 48px; text-align: center;
    background: rgba(0,85,184,0.06); border-radius: 8px; padding: 0.4rem 0.25rem;
}
.cal-event-date .day { font-size: 1.3rem; font-weight: 800; color: var(--kv-blue); line-height: 1.2; }
.cal-event-date .month { font-size: 0.62rem; font-weight: 600; color: var(--kv-text-muted); text-transform: uppercase; letter-spacing: 0.5px; }
.cal-event-body { flex: 1; min-width: 0; }
.cal-event-title { font-size: 0.9rem; font-weight: 600; color: var(--kv-text); margin-bottom: 0.25rem; }
.cal-event-desc { font-size: 0.78rem; color: var(--kv-text-muted); line-height: 1.4; margin-bottom: 0.35rem; }
.cal-event-meta {
    display: flex; gap: 0.65rem; align-items: center;
    font-size: 0.72rem; color: var(--kv-text-muted);
}
.cal-event-meta svg { width: 12px; height: 12px; vertical-align: -1px; margin-right: 2px; }
.cal-event-type {
    display: inline-block; background: rgba(0,85,184,0.08); color: var(--kv-blue);
    font-size: 0.65rem; font-weight: 700; padding: 0.1rem 0.5rem;
    border-radius: 4px; text-transform: uppercase; letter-spacing: 0.3px;
}
.cal-event-type.workshop { background: rgba(255,115,0,0.08); color: var(--kv-orange); }
.cal-event-type.meetup { background: rgba(139,92,246,0.08); color: #8b5cf6; }
.cal-event-type.qa { background: rgba(22,163,106,0.08); color: var(--kv-success, #16a34a); }
.cal-event-actions { display: flex; flex-direction: column; align-items: flex-end; gap: 0.35rem; flex-shrink: 0; }
.cal-registered-badge {
    display: inline-flex; align-items: center; gap: 0.25rem;
    font-size: 0.68rem; font-weight: 600; color: var(--kv-success, #16a34a);
}
.cal-join-link {
    display: inline-flex; align-items: center; gap: 0.25rem;
    font-size: 0.72rem; font-weight: 600; color: var(--kv-blue);
    text-decoration: none;
}
.cal-join-link:hover { text-decoration: underline; }
.cal-empty {
    text-align: center; padding: 2.5rem 1.5rem;
    color: var(--kv-text-muted); font-size: 0.88rem;
}

/* --- RESPONSIVE --- */
@media (max-width: 1024px) {
  .student-layout { grid-template-columns: 1fr; }
  .student-sidebar { display: none; }
  .student-content { margin-left: 0; padding: var(--space-5, 1.25rem); }
  .kpi-grid { grid-template-columns: repeat(2, 1fr); }
  .lesson-layout { grid-template-columns: 1fr; }
  .stu-stats { grid-template-columns: repeat(3, 1fr); }

  /* Aula: stack vertical on tablet */
  .aula-layout { grid-template-columns: 1fr; }
  .aula-sidebar {
    height: auto;
    max-height: 50vh;
    position: relative;
    border-left: none;
    border-top: 1.5px solid var(--kv-border, #e2e8f0);
  }
  .aula-main { min-height: auto; }
}

@media (max-width: 768px) {
  .kpi-grid { grid-template-columns: 1fr 1fr; gap: var(--space-3, 0.75rem); }
  .my-courses-grid { grid-template-columns: 1fr; }
  .student-content { padding: var(--space-4, 1rem); }
  .stu-stats { grid-template-columns: repeat(2, 1fr); }
  .stu-continue-card { gap: 0.75rem; padding: 0.85rem 1rem; }
  .stu-continue-icon { width: 40px; height: 40px; }
  .stu-continue-title { font-size: 0.88rem; }
  .stu-continue-progress { display: none; }

  /* Forum mobile */
  .forum-header { flex-direction: column; align-items: flex-start; }
  .forum-toolbar { flex-direction: column; }
  .forum-thread { padding: 0.65rem 0.75rem; }
  .forum-thread-meta { flex-wrap: wrap; gap: 0.4rem; }
  .forum-post { padding: var(--space-4); }

  /* Calendar mobile */
  .stu-two-col { grid-template-columns: 1fr; }
  .cal-header { flex-direction: column; align-items: flex-start; }
  .cal-event { flex-direction: column; gap: 0.5rem; }
  .cal-event-actions { flex-direction: row; align-items: center; }

  /* Aula mobile adjustments */
  .aula-sidebar { max-height: 60vh; }
  .video-container { aspect-ratio: 16/10; }
  .chapters-list { flex-wrap: nowrap; overflow-x: auto; }
  .citation-quote { display: none; }
}

@media (max-width: 480px) {
  .kpi-grid { grid-template-columns: 1fr; }
  .stu-stats { grid-template-columns: 1fr 1fr; gap: 0.5rem; }
  .stu-continue-card { flex-wrap: wrap; }
  .stu-continue-arrow { display: none; }
  .stu-activity-course { display: none; }

  .aula-tabs { font-size: 0.65rem; }
  .chat-welcome { padding: var(--space-4) var(--space-3); }
  .suggestion-chip { font-size: 0.62rem; padding: 0.25rem 0.5rem; }

  .continue-card { padding: 1.25rem; }
  .continue-title { font-size: 1rem; }
}

/* ═══════════════════════════════════════════════════════
   CONTINUE LEARNING HERO (Dashboard)
   ═══════════════════════════════════════════════════════ */
.continue-card {
  background: linear-gradient(135deg, var(--kv-blue) 0%, var(--kv-blue-dark, #003D87) 100%);
  border-radius: var(--radius-lg, 14px);
  padding: 1.75rem 2rem;
  margin-bottom: 1.5rem;
  transition: transform 0.2s, box-shadow 0.2s;
  box-shadow: var(--shadow-md);
}
.continue-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}
.continue-card-content {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}
.continue-label {
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: rgba(255,255,255,0.65);
}
.continue-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
  margin: 0.25rem 0 0.75rem;
}
.continue-progress {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.continue-progress .progress-bar {
  background: rgba(255,255,255,0.2);
}
.continue-progress .progress-fill {
  background: var(--kv-orange, #FF7300);
}
.continue-pct {
  font-size: 0.85rem;
  font-weight: 700;
  color: #fff;
  white-space: nowrap;
}

/* ═══════════════════════════════════════════════════════
   COURSE CARD — Estandarizado (UI-004)
   ═══════════════════════════════════════════════════════ */
.course-card {
  border-radius: var(--radius-lg, 14px);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform 0.22s cubic-bezier(0.4, 0, 0.2, 1), box-shadow 0.22s;
  border: 1px solid var(--border, #E2E8F0);
}
.course-card:hover:not(.expired) {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.course-card.expired {
  opacity: 0.6;
  filter: grayscale(0.4);
}

/* Thumbnail area */
.course-card-thumb {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--kv-bg-muted, #F1F5F9);
}
.course-card-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.course-card-thumb-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--kv-bg-muted, #F1F5F9), var(--kv-bg-soft, #F8F9FC));
}
.course-card-thumb .badge {
  position: absolute;
  top: 0.5rem;
  left: 0.5rem;
  font-size: 0.65rem;
  padding: 0.2rem 0.5rem;
}

/* Body */
.course-card-body {
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
  flex: 1;
}
.course-card-body .card-title {
  font-size: 0.95rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 0.5rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.course-card-meta {
  display: flex;
  justify-content: space-between;
  font-size: 0.72rem;
  color: var(--text-muted, #94A3B8);
  margin-bottom: 0.75rem;
}
.course-card-meta span {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}
.course-card-cert {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  margin-top: 0.5rem;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--kv-success, #16A34A);
  text-decoration: none;
  padding: 0.25rem 0.5rem;
  border-radius: 6px;
  background: var(--kv-success-bg, #F0FDF4);
  transition: background 0.15s;
}
.course-card-cert:hover {
  background: rgba(22,163,74,0.15);
}

/* Grid responsive */
.course-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.25rem;
}
@media (max-width: 768px) {
  .course-grid { grid-template-columns: 1fr; }
  .continue-card { padding: 1.25rem 1.25rem; }
  .continue-title { font-size: 1.05rem; }
}

/* ============================================================
   PHASE 8 — Premium Dashboard Components
   ============================================================ */

.stu-continue-card {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
    background: linear-gradient(135deg, var(--kv-blue-50) 0%, var(--kv-bg) 100%);
    border: 1.5px solid var(--kv-blue-100);
    border-radius: var(--radius-xl);
    padding: 1.5rem 2rem;
    margin-bottom: 1.5rem;
    position: relative;
    overflow: hidden;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}
.stu-continue-card:hover {
    border-color: var(--kv-blue);
    box-shadow: 0 8px 32px var(--kv-blue-glow);
}
.stu-continue-left { flex: 1; position: relative; z-index: 1; }
.stu-continue-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    background: var(--kv-orange);
    color: #fff;
    padding: 0.2rem 0.625rem;
    border-radius: var(--radius-full);
    font-size: 0.68rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
}
.stu-continue-title {
    font-size: 1.15rem;
    font-weight: 800;
    color: var(--kv-text);
    margin-bottom: 0.25rem;
}
.stu-continue-module {
    font-size: 0.82rem;
    color: var(--kv-text-secondary);
    margin-bottom: 1rem;
}
.stu-continue-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}
.stu-continue-right {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}
.stu-progress-pct {
    position: absolute;
    font-size: 1rem;
    font-weight: 800;
    color: var(--kv-text);
}

/* ── Typing Indicator ── */
.typing-dots {
    display: flex;
    gap: 4px;
    padding: 4px 0;
}
.typing-dots span {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--kv-text-muted);
    animation: typingBounce 1.4s infinite ease-in-out;
}
.typing-dots span:nth-child(2) { animation-delay: 0.16s; }
.typing-dots span:nth-child(3) { animation-delay: 0.32s; }
@keyframes typingBounce {
    0%, 80%, 100% { transform: translateY(0); opacity: 0.4; }
    40% { transform: translateY(-6px); opacity: 1; }
}

/* ============================================================
   PHASE 16 — Quiz Premium UI
   ============================================================ */

.quiz-container {
    max-width: 720px;
    margin: 0 auto;
    padding: var(--space-4) 0;
}
.quiz-progress {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}
.quiz-progress-bar {
    flex: 1;
    height: 6px;
    background: var(--kv-bg-muted);
    border-radius: 3px;
    overflow: hidden;
}
.quiz-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--kv-blue), var(--kv-blue-light));
    border-radius: 3px;
    transition: width 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}
.quiz-option {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    width: 100%;
    padding: 0.875rem 1.125rem;
    margin-bottom: 0.5rem;
    background: var(--kv-bg);
    border: 1.5px solid var(--kv-border);
    border-radius: var(--radius-md);
    font-size: 0.88rem;
    font-family: var(--font-body);
    color: var(--kv-text);
    cursor: pointer;
    text-align: left;
    transition: all 0.2s ease;
}
.quiz-option:hover:not(.correct):not(.wrong):not(.selected) {
    border-color: var(--kv-blue-100);
    background: var(--kv-blue-50);
    transform: translateX(4px);
}
.quiz-option.selected {
    border-color: var(--kv-blue);
    background: var(--kv-blue-50);
    color: var(--kv-blue);
    font-weight: 600;
}
.quiz-option.correct {
    border-color: var(--kv-success);
    background: var(--kv-success-bg);
    color: var(--kv-success);
    font-weight: 600;
    pointer-events: none;
}
.quiz-option.wrong {
    border-color: var(--kv-danger);
    background: var(--kv-danger-bg);
    color: var(--kv-danger);
    pointer-events: none;
}
.quiz-explanation {
    margin-top: 1rem;
    padding: 0.875rem 1rem;
    background: var(--kv-info-bg);
    border: 1px solid rgba(2, 132, 199, 0.15);
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    color: var(--kv-info);
    line-height: 1.6;
}
.quiz-result {
    text-align: center;
    padding: 2.5rem 1.5rem;
    animation: quizResultIn 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}
@keyframes quizResultIn {
    from { opacity: 0; transform: scale(0.9) translateY(20px); }
    to   { opacity: 1; transform: scale(1) translateY(0); }
}

@media (max-width: 768px) {
    .stu-continue-card {
        flex-direction: column;
        text-align: center;
        padding: 1.25rem;
    }
    .stu-continue-actions {
        justify-content: center;
    }
}