/* ============================================================
   VideoRAMS Campus — vr.css
   Sistema de diseño VideoRAMS (misma identidad que FMECA/GMAO:
   paleta navy/teal, Segoe UI, tarjetas, banner de marca).
   ============================================================ */
:root {
  --navy: #0B3D66;
  --navy-h: #0A3357;
  --navy-deep: #0A2A47;
  --teal: #0E8C7F;
  --bg: #F4F6F9;
  --surface: #FFFFFF;
  --border: #DCE3EC;
  --border-strong: #B9C6D6;
  --txt: #17293B;
  --txt-2: #5B6B7C;
  --txt-3: #93A1B0;
  --ok: #1E7D46;
  --warn: #9A6700;
  --err: #B3261E;
  --info: #0B5CAD;
  --info-bg: #E8F1FB;
  --shadow-1: 0 1px 2px rgba(11,61,102,.06), 0 1px 3px rgba(11,61,102,.04);
  --shadow-2: 0 4px 12px rgba(11,61,102,.10);
  --font-ui: "Segoe UI Variable Text", "Segoe UI", system-ui, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  padding: 0 16px;
  font-family: var(--font-ui);
  background: var(--bg);
  color: var(--txt);
  line-height: 1.55;
}

.container { max-width: 1180px; margin: 0 auto; }

/* ===== Banner de marca ===== */
.vr-banner {
  background: linear-gradient(120deg, var(--navy-deep) 0%, var(--navy) 55%, var(--teal) 130%);
  border-radius: 0 0 14px 14px;
  padding: 20px 28px;
  margin: 0 auto 20px;
  max-width: 1180px;
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  box-shadow: var(--shadow-2);
}
.vr-banner .b-brand { display: flex; align-items: center; gap: 14px; }
.vr-banner .b-icon { font-size: 34px; }
.vr-banner h1 { color: #fff; margin: 0; font-size: 23px; letter-spacing: .2px; }
.vr-banner p { color: #C7DCF2; margin: 2px 0 0; font-size: 13px; }
.vr-banner .b-user { display: flex; align-items: center; gap: 10px; }
.vr-banner .b-tag {
  background: rgba(255,255,255,.14);
  border: 1px solid rgba(255,255,255,.25);
  padding: 5px 12px; border-radius: 20px;
  font-size: 12px; color: #E8F0FA; white-space: nowrap;
}
.vr-banner form.inline { display: inline; }

/* ===== Hero ===== */
.vr-hero {
  background: linear-gradient(135deg, #0B3D66 0%, #0A2A47 60%, #0E4A63 100%);
  border-radius: 14px;
  padding: 26px 32px;
  margin: 0 0 22px;
  box-shadow: var(--shadow-2);
  position: relative;
  overflow: hidden;
}
.vr-hero::after {
  content: "";
  position: absolute; right: -60px; top: -60px;
  width: 260px; height: 260px; border-radius: 50%;
  background: radial-gradient(circle, rgba(79,163,217,.18) 0%, transparent 70%);
}
.vr-hero h1 { color: #fff; font-size: 26px; margin: 0 0 6px; }
.vr-hero p { color: #B9CFE2; font-size: 14.5px; margin: 0 0 14px; max-width: 640px; }
.vr-chip {
  display: inline-block; padding: 4px 12px; margin-right: 8px; margin-top: 2px;
  border-radius: 999px; font-size: 11.5px; font-weight: 600; letter-spacing: .3px;
  background: rgba(255,255,255,.10); color: #DCEAF5;
  border: 1px solid rgba(255,255,255,.22);
}

/* ===== Grid de cards ===== */
.vr-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
  margin-bottom: 20px;
}

.vr-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow-1);
  transition: transform .15s ease, box-shadow .15s ease;
}
.vr-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-2); }
.vr-card img { width: 100%; height: 170px; object-fit: cover; display: block; }
.vr-card .card-body { padding: 18px; }
.vr-card h2, .vr-card h3 { margin: 0 0 8px; color: var(--txt); }
.vr-card .desc { font-size: 13.5px; color: var(--txt-2); margin: 0 0 10px; }
.vr-card .meta { font-size: 12.5px; color: var(--txt-2); margin: 0 0 14px; }
.vr-card.large { padding: 22px; }
.vr-card .course-cover { height: 220px; border-radius: 10px; margin-bottom: 14px; }

.vr-card-buttons { display: flex; gap: 8px; flex-wrap: wrap; }

/* ===== Botones ===== */
.vr-btn {
  display: inline-flex; align-items: center;
  padding: 8px 14px; border-radius: 8px;
  font-weight: 600; font-size: 13px;
  border: 1px solid var(--border-strong);
  background: var(--surface); color: var(--navy);
  text-decoration: none; cursor: pointer;
  transition: background .15s, border-color .15s, box-shadow .15s;
  font-family: var(--font-ui);
}
.vr-btn:hover { background: #F0F4F8; border-color: var(--navy); }
.vr-btn.primary { background: var(--navy); color: #fff; border-color: var(--navy); }
.vr-btn.primary:hover { background: var(--navy-h); box-shadow: var(--shadow-2); }
.vr-btn.ok { background: var(--teal); color: #fff; border-color: var(--teal); }
.vr-btn.ok:hover { background: #0B7A6E; }
.btn-block { width: 100%; justify-content: center; margin-top: 6px; }

/* ===== Login ===== */
.vr-login {
  max-width: 420px; margin: 40px auto;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 30px;
  box-shadow: var(--shadow-1);
}
.vr-login h2 { margin: 0 0 6px; }
.vr-login .sub { color: var(--txt-2); font-size: 13px; margin: 0 0 14px; }
.vr-login label {
  display: block; font-size: 12px; font-weight: 600;
  text-transform: uppercase; letter-spacing: .5px;
  color: var(--txt-2); margin: 12px 0 4px;
}
.vr-login input {
  width: 100%; padding: 10px 12px;
  border: 1px solid var(--border); border-radius: 8px;
  font-size: 14px; font-family: var(--font-ui);
  transition: border-color .15s, box-shadow .15s;
}
.vr-login input:focus {
  border-color: var(--navy); outline: none;
  box-shadow: 0 0 0 3px rgba(11,61,102,.14);
}
.vr-login .hint { font-size: 12px; color: var(--txt-3); margin: 16px 0 0; }
.vr-login code { background: var(--surface-alt, #F0F4F8); padding: 1px 6px; border-radius: 4px; }

/* ===== Aula / avisos ===== */
.vr-aula {
  max-width: 800px; margin: 40px auto;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 28px;
  box-shadow: var(--shadow-1);
}
.vr-alert {
  padding: 10px 16px; border-radius: 8px;
  background: var(--info-bg); border: 1px solid #C5DCF2;
  color: #0A4A8A; margin: 12px 0;
}
.vr-alert.warn { background: #FFF6E0; border-color: #F0DFA8; color: var(--warn); }
.vr-alert.info { background: var(--info-bg); border-color: #C5DCF2; color: #0A4A8A; }

/* ===== Tabla de detalles ===== */
.vr-table { width: 100%; border-collapse: collapse; margin: 10px 0 18px; }
.vr-table th, .vr-table td {
  padding: 10px 12px; border-bottom: 1px solid var(--border);
  text-align: left; vertical-align: top; font-size: 14px;
}
.vr-table th { width: 170px; color: var(--txt-2); font-weight: 600; }
.vr-pre { margin: 0; white-space: pre-line; font-family: var(--font-ui); font-size: 14px; }

.vr-breadcrumb { margin: 6px 0 12px; }
.vr-breadcrumb a { color: var(--navy); text-decoration: none; font-size: 13.5px; }
.vr-breadcrumb a:hover { text-decoration: underline; }

/* ===== Empty state ===== */
.vr-empty {
  text-align: center; padding: 56px 20px;
  background: var(--surface);
  border: 1.5px dashed var(--border-strong); border-radius: 12px;
  margin: 30px 0;
}
.vr-empty .ico { font-size: 40px; opacity: .5; }
.vr-empty h3 { margin: 10px 0 4px; }
.vr-empty p { color: var(--txt-2); font-size: 13.5px; }

/* ===== Footer ===== */
.vr-footer {
  max-width: 1180px; margin: 48px auto 0;
  padding: 18px 4px 26px;
  border-top: 1px solid var(--border);
  display: flex; justify-content: space-between;
  font-size: 12px; color: var(--txt-3); flex-wrap: wrap; gap: 6px;
}
.vr-footer a { color: var(--txt-2); text-decoration: none; }
.vr-footer a:hover { color: var(--navy); }

/* ===== Scrollbar ===== */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: #C3CEDA; border-radius: 8px; border: 2px solid var(--bg); }
::-webkit-scrollbar-thumb:hover { background: #9FB0C2; }

/* ===== Responsive ===== */
@media (max-width: 700px) {
  .vr-banner { padding: 16px; justify-content: center; text-align: center; }
  .vr-banner .b-brand { flex-direction: column; }
  .vr-grid { grid-template-columns: 1fr; }
  .vr-footer { justify-content: center; text-align: center; }
}

/* ===== Panel de administración ===== */
.vr-login.wide { max-width: 760px; }
.vr-login textarea, .vr-login select {
  width: 100%; padding: 10px 12px;
  border: 1px solid var(--border); border-radius: 8px;
  font-size: 14px; font-family: var(--font-ui);
}
.vr-login .form-row { display: flex; gap: 14px; }
.vr-login .form-row > div { flex: 1; }
.vr-login .chk { display: flex; align-items: center; gap: 8px; margin: 14px 0; }
.vr-login .chk input { width: auto; }
.vr-login input[type=file] { border: 1.5px dashed var(--border-strong); padding: 8px; }
.admin-table-wrap { background: var(--surface); border: 1px solid var(--border);
  border-radius: 12px; overflow-x: auto; box-shadow: var(--shadow-1); margin-bottom: 18px; }
.admin-table { margin: 0; }
.admin-table th { width: auto; }
.vr-grid.mini { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
.vr-card.lesson h4 { margin: 6px 0 6px; }
@media (max-width: 700px) {
  .vr-login .form-row { flex-direction: column; }
}



/* ============================================================
   TABS DE LECCIÓN + PANELES + FORMULARIOS IA (diseño KIMI K3)
   ============================================================ */
/* ============================================================
   TABS DE LECCIÓN + PANELES + FORMULARIOS IA (rediseño)
   ============================================================ */
:root {
  --grad-brand: linear-gradient(120deg, var(--navy) 0%, #0E6B78 60%, var(--teal) 100%);
  --teal-soft: #E3F2F0;
  --navy-soft: #E8F0F8;
  --ring: 0 0 0 3px rgba(14,140,127,.28);
  --r-lg: 16px;
  --r-md: 12px;
  --r-sm: 9px;
}

/* ---------- A. Barra de tabs ---------- */
.vr-tabbar {
  position: sticky;
  top: 8px;
  z-index: 40;
  display: flex;
  gap: 6px;
  padding: 8px;
  margin: 18px 0 20px;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(8px);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-1);
  overflow-x: auto;
  scrollbar-width: none;
  scroll-snap-type: x proximity;
}
.vr-tabbar::-webkit-scrollbar { display: none; }

.vr-tabbar-item {
  --tab-accent: var(--navy);
  --tab-accent-soft: var(--navy-soft);
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 8px 14px 8px 8px;
  border: 1px solid transparent;
  border-radius: 12px;
  background: transparent;
  color: var(--txt-2);
  font: 600 13.5px/1 var(--font-ui);
  white-space: nowrap;
  cursor: pointer;
  scroll-snap-align: start;
  transition: background .18s ease, color .18s ease, transform .18s ease, box-shadow .18s ease;
}
/* acentos por sección */
.vr-tabbar-item--docs  { --tab-accent:#0B5CAD; --tab-accent-soft:#E8F1FB; }
.vr-tabbar-item--chat  { --tab-accent:#0E8C7F; --tab-accent-soft:#E3F2F0; }
.vr-tabbar-item--tutor { --tab-accent:#6D4AC8; --tab-accent-soft:#EFEBFB; }
.vr-tabbar-item--soft  { --tab-accent:#B0651F; --tab-accent-soft:#FAF0E4; }
.vr-tabbar-item--space { --tab-accent:#0B3D66; --tab-accent-soft:#E8F0F8; }
.vr-tabbar-item--exam  { --tab-accent:#B3261E; --tab-accent-soft:#FBEAE9; }

.vr-tabbar-ico {
  display: grid;
  place-items: center;
  width: 32px; height: 32px;
  border-radius: 50%;
  background: var(--tab-accent-soft);
  font-size: 15px;
  transition: background .18s ease, transform .18s ease;
}
.vr-tabbar-item:hover {
  background: var(--tab-accent-soft);
  color: var(--txt);
  transform: translateY(-1px);
}
.vr-tabbar-item:hover .vr-tabbar-ico { transform: scale(1.08); }

/* indicador activo: subrayado animado */
.vr-tabbar-item::after {
  content: "";
  position: absolute;
  left: 14px; right: 14px; bottom: -9px;
  height: 3px;
  border-radius: 3px 3px 0 0;
  background: var(--tab-accent);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform .22s cubic-bezier(.4,0,.2,1);
}
.vr-tabbar-item.is-active {
  background: var(--tab-accent-soft);
  color: var(--tab-accent);
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--tab-accent) 25%, transparent);
}
.vr-tabbar-item.is-active::after { transform: scaleX(1); }

.vr-tabbar-item:focus-visible { outline: none; box-shadow: var(--ring); }

.vr-tabbar-badge {
  min-width: 20px; height: 20px;
  padding: 0 6px;
  display: inline-grid;
  place-items: center;
  border-radius: 10px;
  background: var(--tab-accent);
  color: #fff;
  font-size: 11px;
  font-weight: 700;
}
.vr-tabbar-badge--new {
  background: var(--grad-brand);
  animation: vr-badge-pulse 2.4s ease-in-out infinite;
}
@keyframes vr-badge-pulse {
  0%,100% { box-shadow: 0 0 0 0 rgba(14,140,127,.45); }
  50%     { box-shadow: 0 0 0 5px rgba(14,140,127,0); }
}

/* ---------- B. Panel tipo "app" ---------- */
.vr-tab-panel { animation: vr-panel-in .25s ease both; }
@keyframes vr-panel-in {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: none; }
}

.vr-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-1);
  overflow: hidden;
}

/* cabecera del tab */
.panel-head {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  padding: 18px 24px;
  background: linear-gradient(180deg, var(--navy-soft) 0%, #fff 100%);
  border-bottom: 1px solid var(--border);
}
.panel-head-ico {
  display: grid;
  place-items: center;
  width: 44px; height: 44px;
  border-radius: 12px;
  background: var(--grad-brand);
  color: #fff;
  font-size: 20px;
  box-shadow: var(--shadow-2);
  flex-shrink: 0;
}
.panel-head-text { flex: 1 1 260px; min-width: 0; }
.panel-head-text h3 {
  margin: 0 0 3px;
  font-size: 17px;
  color: var(--navy);
  letter-spacing: .2px;
}
.panel-head-text .sub { margin: 0; font-size: 13px; color: var(--txt-2); }
.panel-head-actions { display: flex; gap: 8px; margin-left: auto; }

/* cuerpo del tab */
.panel-body { padding: 22px 24px 26px; }
.panel-body > * + * { margin-top: 18px; }

.panel-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: 16px 18px;
  box-shadow: var(--shadow-1);
}
.panel-card > h4 {
  margin: 0 0 12px;
  font-size: 14px;
  color: var(--navy);
  display: flex;
  align-items: center;
  gap: 8px;
}
.panel-sep {
  border: 0;
  border-top: 1px dashed var(--border-strong);
  margin: 22px 0;
}

/* ---------- Documentos ---------- */
.doc-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  transition: border-color .15s ease, background .15s ease, transform .15s ease;
}
.doc-item + .doc-item { margin-top: 10px; }
.doc-item:hover {
  border-color: var(--teal);
  background: var(--teal-soft);
  transform: translateX(3px);
}
.doc-item .doc-nombre { flex: 1; min-width: 0; font-weight: 600; color: var(--txt); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.doc-item .doc-acciones { flex-shrink: 0; }
.vr-pre {
  background: #0E2233;
  color: #D7E6F5;
  border-radius: var(--r-sm);
  padding: 14px 16px;
  font-size: 12.5px;
  line-height: 1.6;
  overflow-x: auto;
  border: 1px solid #0A2A47;
}

/* ---------- Estado vacío mejorado ---------- */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 44px 24px;
  border: 1.5px dashed var(--border-strong);
  border-radius: var(--r-md);
  background: repeating-linear-gradient(135deg, #FBFCFE 0 12px, #F6F9FC 12px 24px);
}
.empty-state .ico {
  display: grid;
  place-items: center;
  width: 72px; height: 72px;
  margin-bottom: 14px;
  border-radius: 50%;
  background: var(--navy-soft);
  font-size: 32px;
  box-shadow: inset 0 0 0 6px #fff, var(--shadow-1);
}
.empty-state h3 { margin: 0 0 6px; font-size: 16px; color: var(--navy); }
.empty-state p  { margin: 0; max-width: 420px; font-size: 13.5px; color: var(--txt-2); }
.empty-state .vr-btn { margin-top: 16px; }

/* ---------- C. Formularios IA ---------- */
.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 14px 16px;
}
.vr-field { display: flex; flex-direction: column; gap: 6px; }
.vr-field > label {
  font-size: 12.5px;
  font-weight: 700;
  color: var(--navy);
  letter-spacing: .3px;
  text-transform: uppercase;
}
.vr-field .hint { font-size: 12px; color: var(--txt-3); }
.vr-field textarea,
.vr-field input[type="text"],
.vr-field select {
  width: 100%;
  padding: 11px 13px;
  border: 1.5px solid var(--border);
  border-radius: var(--r-sm);
  background: #FBFCFE;
  color: var(--txt);
  font: 400 14px/1.5 var(--font-ui);
  transition: border-color .16s ease, box-shadow .16s ease, background .16s ease;
}
.vr-field textarea { resize: vertical; min-height: 90px; }
.vr-field textarea:hover,
.vr-field select:hover,
.vr-field input[type="text"]:hover { border-color: var(--border-strong); }
.vr-field textarea:focus,
.vr-field select:focus,
.vr-field input[type="text"]:focus {
  outline: none;
  border-color: var(--teal);
  background: #fff;
  box-shadow: var(--ring);
}
.vr-field select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%230B3D66' stroke-width='1.6' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 32px;
}

/* botón primario con gradiente de marca */
.vr-btn.primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border: 0;
  border-radius: 10px;
  background: var(--grad-brand);
  color: #fff;
  font: 700 14px/1 var(--font-ui);
  letter-spacing: .2px;
  cursor: pointer;
  box-shadow: 0 3px 10px rgba(11,61,102,.28);
  transition: transform .16s ease, box-shadow .16s ease, filter .16s ease;
}
.vr-btn.primary:hover { transform: translateY(-2px); box-shadow: 0 6px 16px rgba(11,61,102,.34); filter: brightness(1.06); }
.vr-btn.primary:active { transform: translateY(0); box-shadow: 0 2px 6px rgba(11,61,102,.25); }
.vr-btn.primary:focus-visible { outline: none; box-shadow: var(--ring), 0 3px 10px rgba(11,61,102,.28); }
.vr-btn.primary[disabled] { opacity: .6; cursor: wait; transform: none; }

/* ---------- Hilo de conversación IA ---------- */
.ia-thread { display: flex; flex-direction: column; gap: 14px; }
.ia-msg { display: flex; gap: 12px; align-items: flex-start; max-width: 88%; }
.ia-msg .ia-avatar {
  display: grid;
  place-items: center;
  width: 34px; height: 34px;
  border-radius: 50%;
  flex-shrink: 0;
  font-size: 15px;
  box-shadow: var(--shadow-1);
}
.ia-msg .ia-bubble {
  padding: 12px 15px;
  border-radius: 14px;
  font-size: 14px;
  line-height: 1.6;
  box-shadow: var(--shadow-1);
}
.ia-msg.user { align-self: flex-end; flex-direction: row-reverse; }
.ia-msg.user .ia-avatar { background: var(--navy-soft); }
.ia-msg.user .ia-bubble {
  background: var(--navy);
  color: #EAF2FA;
  border-bottom-right-radius: 4px;
}
.ia-msg.bot { align-self: flex-start; }
.ia-msg.bot .ia-avatar { background: var(--grad-brand); color: #fff; }
.ia-msg.bot .ia-bubble {
  background: var(--teal-soft);
  border: 1px solid color-mix(in srgb, var(--teal) 22%, transparent);
  color: var(--txt);
  border-bottom-left-radius: 4px;
}
.ia-bubble pre,
.ia-msg .ia-bubble code {
  font-family: Consolas, "Courier New", monospace;
}
.ia-msg .ia-bubble pre {
  margin: 10px 0 0;
  padding: 12px 14px;
  border-radius: 8px;
  background: #0E2233;
  color: #D7E6F5;
  font-size: 12.5px;
  overflow-x: auto;
}

/* ---------- Responsive ---------- */
@media (max-width: 720px) {
  .vr-tabbar { padding: 6px; gap: 4px; }
  .vr-tabbar-item { padding: 6px 10px 6px 6px; font-size: 12.5px; }
  .vr-tabbar-ico { width: 28px; height: 28px; font-size: 13px; }
  .panel-body, .panel-head { padding-left: 16px; padding-right: 16px; }
  .ia-msg { max-width: 100%; }
}
@media (max-width: 460px) {
  .vr-tabbar-label { display: none; }               /* solo iconos */
  .vr-tabbar-item { padding: 6px; }
  .vr-tabbar-badge { position: absolute; top: -4px; right: -2px; }
}
@media (prefers-reduced-motion: reduce) {
  .vr-tabbar-item, .vr-tabbar-item::after, .vr-tabbar-ico,
  .vr-btn.primary, .doc-item, .vr-tab-panel { animation: none; transition: none; }
}
/* seguridad: paneles ocultos */
.vr-tab-panel[hidden] { display: none !important; }