/* Vistas del estudiante: cabecera, login, overlay de nodo, quiz, veredicto. */

#app-view {
  display: flex;
  flex-direction: column;
  height: 100vh;
}

header {
  height: var(--header-h);
  flex: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 18px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-overlay);
}

#header-title {
  font-family: var(--font-display);
  font-size: 1.06em;
  letter-spacing: 0.04em;
  /* El nombre del curso puede ser largo ("Termodinámica y Cinética Básica
     (530.210)"): sin esto desbordaba el alto fijo del encabezado partiéndose
     en dos líneas. min-width:0 permite que el flex item encoja. */
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  min-width: 0;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 14px;
  flex: none;
}

#view-toggle {
  font-size: 1.05rem;
  line-height: 1;
  padding: 6px 10px;
}

.header-center {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* ---------- barra espectral (firma visual) ---------- */

#spectrum-bar {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 6px 14px;
  background: #060a12;
  border: 1px solid var(--border);
  border-radius: 6px;
  height: 30px;
}

.spec-line {
  width: 3px;
  height: 16px;
  padding: 0;
  border: none;
  border-radius: 1px;
  background: var(--locked);
  opacity: 0.45;
  cursor: pointer;
  transition: opacity var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.spec-line.milestone {
  height: 20px;
  width: 4px;
}

.spec-line.lit {
  background: var(--line-color);
  /* intensidad parcial = avance parcial de la unidad */
  opacity: calc(0.35 + 0.65 * var(--line-intensity));
  box-shadow: 0 0 calc(8px * var(--line-intensity)) var(--line-color);
}

.spec-line:hover {
  opacity: 1;
}

/* ---------- login ---------- */

#login-view {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background:
    radial-gradient(ellipse at 50% 30%, #131c2e 0%, transparent 65%),
    var(--bg-deep);
}

.login-card {
  width: min(420px, 92vw);
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 34px 36px;
  box-shadow: 0 18px 60px rgba(0, 0, 0, 0.5);
}

.login-card h1 {
  margin: 0 0 4px;
  font-size: 1.5em;
}

.login-card button[type="submit"] {
  width: 100%;
  margin-top: 6px;
  background: color-mix(in srgb, var(--spec-cyan) 18%, var(--bg-raised));
  border-color: color-mix(in srgb, var(--spec-cyan) 45%, var(--border));
}

/* ---------- panel lateral de nodo ---------- */

#side-panel {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: min(380px, 92vw);
  background: color-mix(in srgb, var(--bg-overlay) 92%, transparent);
  backdrop-filter: blur(8px);
  border-left: 1px solid var(--border);
  padding: 16px 22px 24px;
  overflow-y: auto;
  transform: translateX(100%);
  transition: transform var(--dur) var(--ease);
  z-index: 40;
}

#side-panel.open {
  transform: none;
}

#side-panel-close {
  position: absolute;
  top: 10px;
  right: 12px;
  padding: 4px 10px;
  /* En móvil el panel es una hoja inferior y esta ✕ es la forma natural de
     cerrarla: a 35x34 px quedaba bajo el mínimo táctil recomendado. */
  min-width: 44px;
  min-height: 44px;
}

.sp-type {
  color: var(--ink-dim);
  font-size: 0.74em;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin: 6px 0 4px;
}

.sp-title {
  margin: 0 0 8px;
  font-size: 1.35em;
  padding-right: 30px;
}

.sp-status {
  font-family: var(--font-mono);
  font-size: 0.8em;
  margin-bottom: 14px;
}

.sp-status.status-passed { color: var(--spec-cyan); }
.sp-status.status-available { color: var(--ink); }
.sp-status.status-read { color: var(--spec-cyan); }
.sp-status.status-locked { color: var(--ink-dim); }
.sp-status.status-planned { color: var(--ink-dim); font-style: italic; }

.sp-section {
  color: var(--ink-dim);
  font-size: 0.7em;
  letter-spacing: 0.16em;
  margin: 18px 0 6px;
  border-top: 1px solid var(--border);
  padding-top: 12px;
}

.sp-desc {
  margin: 0;
  font-family: var(--font-display);
}

.sp-placeholder {
  margin: 0;
  color: var(--ink-dim);
  font-style: italic;
  opacity: 0.7;
}

.sp-list {
  margin: 0;
  padding-left: 18px;
}

.sp-reqs {
  list-style: none;
  padding-left: 2px;
}

.sp-reqs li {
  display: flex;
  gap: 8px;
  align-items: baseline;
  padding: 2px 0;
}

.req-mark { font-family: var(--font-mono); }
.req-ok .req-mark { color: var(--spec-cyan); }
.req-missing { color: var(--ink-dim); }
.req-missing .req-mark { color: var(--spec-amber); }

.sp-meta {
  display: flex;
  gap: 18px;
  margin-top: 16px;
  color: var(--ink-dim);
  font-size: 0.9em;
}

.sp-action {
  margin-top: 20px;
}

.sp-action button {
  width: 100%;
}

.sp-locked-note {
  color: var(--spec-amber);
  font-size: 0.92em;
}

/* móvil: el panel lateral se vuelve hoja inferior */
@media (max-width: 720px) {
  #side-panel {
    top: auto;
    left: 0;
    right: 0;
    bottom: 0;
    width: 100%;
    max-height: 62vh;
    border-left: none;
    border-top: 1px solid var(--border);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    transform: translateY(100%);
  }

  #side-panel.open {
    transform: none;
  }

  .header-center {
    display: none; /* el espectro no cabe; el % vive en el propio árbol */
  }

  header {
    padding: 0 10px;
  }

  #header-title {
    font-size: 0.92em;
    letter-spacing: 0.02em;
  }

  /* El estudiante sabe quién es; en 360 px ese nombre empujaba el título a
     partirse en dos líneas y a comerse el alto del encabezado. */
  #student-name {
    display: none;
  }

  .header-right {
    gap: 8px;
  }

  /* Área táctil mínima para los botones del encabezado. */
  #view-toggle,
  #logout-btn {
    min-height: 40px;
  }

  #overlay-panel {
    padding: 0 2px;
  }

  .content-card {
    padding: 18px 16px;
  }
}

/* ---------- overlay de nodo ---------- */

#node-overlay {
  position: fixed;
  inset: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg-deep) 72%, transparent);
  backdrop-filter: blur(6px);
  display: flex;
  justify-content: center;
  overflow-y: auto;
  padding: 4vh 18px;
}

#overlay-panel {
  width: min(1460px, 100%);
  animation: overlay-in var(--dur) var(--ease);
}

/* vistas de una sola columna (checkpoint, hito) no se estiran */
#main-panel:not(.three-col) > .content-card,
#main-panel:not(.three-col) > .chat-box,
#main-panel:not(.three-col) > .verdict-box {
  max-width: 940px;
  margin-left: auto;
  margin-right: auto;
}

@keyframes overlay-in {
  from { opacity: 0; transform: translateY(14px); }
  to { opacity: 1; transform: none; }
}

#overlay-close {
  margin-bottom: 12px;
  position: sticky;
  top: 0;
  z-index: 5;
}

#main-panel {
  padding-bottom: 8vh;
}

.content-card {
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 30px 42px 34px;
}

/* medida de lectura cómoda: el texto no se estira con la columna */
.content-body {
  max-width: 76ch;
  margin: 0 auto;
}

.breadcrumb {
  font-family: var(--font-mono);
  font-size: 0.78em;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-dim);
  margin-bottom: 12px;
}

.actions {
  display: flex;
  gap: 12px;
  align-items: center;
  margin-top: 18px;
}

/* ---------- lectura a tres columnas ---------- */

.content-grid {
  display: grid;
  grid-template-columns: 200px minmax(0, 1fr) 340px;
  gap: 22px;
  align-items: start;
}

.tree-path {
  position: sticky;
  top: 48px;
  font-size: 0.88em;
}

.tp-unit {
  font-family: var(--font-display);
  font-size: 1.05em;
}

.tp-node {
  color: var(--ink-dim);
  padding: 3px 0;
}

.tp-node.req-ok {
  color: var(--spec-cyan);
}

.tutor-col {
  position: sticky;
  top: 48px;
}

.tutor-col .chat-box {
  margin-top: 0;
}

.tutor-note {
  margin: 0 0 8px;
  border-left: 2px solid var(--spec-violet);
  padding-left: 10px;
}

.content-foot {
  border-top: 1px solid var(--border);
  margin-top: 18px;
  padding-top: 12px;
}

@media (max-width: 1100px) {
  .content-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .tree-path,
  .tutor-col {
    position: static;
  }
}

/* ---------- quiz ---------- */

.step-dots {
  display: flex;
  gap: 8px;
  margin: 6px 0 4px;
}

.step-dot {
  width: 30px;
  height: 30px;
  padding: 0;
  border-radius: 50%;
  font-size: 0.8em;
  color: var(--ink-dim);
}

.step-dot.answered {
  border-color: var(--spec-cyan);
  color: var(--spec-cyan);
}

.step-dot.current {
  background: color-mix(in srgb, var(--spec-violet) 25%, var(--bg-raised));
  border-color: var(--spec-violet);
  color: var(--ink);
}

.step-nav {
  justify-content: space-between;
}

.checkpoint-card h2 {
  color: var(--spec-violet);
}

/* ---------- resultados ---------- */

.result-head {
  display: flex;
  gap: 24px;
  align-items: center;
  margin: 10px 0 6px;
}

.result-head h2 {
  margin: 0 0 6px;
}

.score-ring {
  width: 96px;
  height: 96px;
  flex: none;
}

.ring-bg {
  fill: none;
  stroke: var(--border);
  stroke-width: 7;
}

.ring-fg {
  fill: none;
  stroke-width: 7;
  stroke-linecap: round;
  transform: rotate(-90deg);
  transform-origin: center;
}

.ring-fg.ok { stroke: var(--ok); }
.ring-fg.bad { stroke: var(--danger); }

.ring-label {
  fill: var(--ink);
  font-family: var(--font-mono);
  font-size: 20px;
}

.result-cols {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
}

.unlocked-box {
  background: color-mix(in srgb, var(--spec-cyan) 7%, var(--bg-raised));
  border: 1px solid color-mix(in srgb, var(--spec-cyan) 35%, var(--border));
  border-radius: var(--radius);
  padding: 4px 16px 12px;
  margin-top: 14px;
}

.verdict-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 6px;
}

.question {
  border-top: 1px solid var(--border);
  padding: 18px 0;
  margin-top: 14px;
}

.qtype {
  color: var(--ink-dim);
  margin-bottom: 8px;
}

.option {
  display: flex;
  gap: 10px;
  align-items: baseline;
  color: var(--ink);
  padding: 6px 10px;
  border-radius: var(--radius);
  cursor: pointer;
}

.option:hover {
  background: color-mix(in srgb, var(--spec-cyan) 8%, transparent);
}

.option input[type="radio"] {
  width: auto;
}

.result-summary {
  border-bottom: 1px solid var(--border);
  padding-bottom: 14px;
  font-size: 1.08em;
}

.result-ok { color: var(--ok); }
.result-bad { color: var(--danger); }
.result-pending { color: var(--spec-amber); }

/* ---------- veredicto de interrogación ---------- */

.verdict-box {
  margin-top: 18px;
  background: color-mix(in srgb, var(--spec-amber) 8%, var(--bg-raised));
  border: 1px solid color-mix(in srgb, var(--spec-amber) 45%, var(--border));
  border-radius: var(--radius-lg);
  padding: 20px 24px;
}

.verdict-box .verdict-title {
  font-family: var(--font-mono);
  letter-spacing: 0.22em;
  color: var(--spec-amber);
  margin-bottom: 10px;
}

/* hito */

.milestone-card h2 {
  color: var(--spec-amber);
}

.sp-voluntary {
  background: color-mix(in srgb, var(--ink-dim) 10%, transparent);
  border-left: 2px solid var(--ink-dim);
  padding: 8px 12px;
  margin: 10px 0;
  font-size: 0.9em;
  color: var(--ink-dim);
  border-radius: 0 var(--radius) var(--radius) 0;
}