:root {
  --bg: #0a0a0f;
  --surface: #0f0f1a;
  --border: #1a1a2e;
  --cyan: #00f5ff;
  --green: #39ff14;
  --red: #ff2d55;
  --yellow: #ffd700;
  --muted: #4a4a6a;
  --text: #c8c8e8;
}

* {
  box-sizing: border-box;
}

/* Scanlines */
.scanlines::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0, 0, 0, 0.08) 2px,
    rgba(0, 0, 0, 0.08) 4px
  );
  pointer-events: none;
  z-index: 9999;
  animation: scanlineScroll 0.3s linear infinite;
}

/* Logo MATHLAB */
.site-logo {
  position: relative;
  display: inline-block;
  overflow: hidden;
}
.site-logo::after {
  content: '';
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0, 0, 0, 0.18) 2px,
    rgba(0, 0, 0, 0.18) 4px
  );
  pointer-events: none;
  animation: scanlineScroll 0.3s linear infinite;
}

@keyframes scanlineScroll {
  from { background-position: 0 0; }
  to   { background-position: 0 4px; }
}

/* Scrollbar */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border); }
::-webkit-scrollbar-thumb:hover { background: var(--muted); }

/* ─── Inputs ─────────────────────────────────────────── */
.cyber-input {
  background: var(--surface);
  border: 1px solid #2e2e52;
  color: var(--text);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.875rem;
  padding: 0.5rem 0.75rem;
  width: 100%;
  outline: none;
  transition: border-color 150ms;
}
.cyber-input:focus {
  border-color: var(--cyan);
  box-shadow: 0 0 0 1px var(--cyan);
}
.cyber-input::placeholder { color: #5c5c82; }
textarea.cyber-input { resize: vertical; min-height: 100px; }
select.cyber-input {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%234a4a6a'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  padding-right: 2rem;
}

/* ─── Botones ────────────────────────────────────────── */
.btn-cyan, .btn-green, .btn-red, .btn-muted, .btn-amber {
  background: transparent;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.875rem;
  padding: 0.5rem 1.25rem;
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
  transition: background 150ms, color 150ms, border-color 150ms;
  position: relative;
  overflow: hidden;
}

.btn-cyan::after, .btn-green::after, .btn-red::after, .btn-muted::after, .btn-amber::after {
  content: '';
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0, 0, 0, 0.15) 2px,
    rgba(0, 0, 0, 0.15) 4px
  );
  pointer-events: none;
  opacity: 0;
  transition: opacity 150ms;
}

.btn-cyan:hover::after, .btn-green:hover::after, .btn-red:hover::after, .btn-muted:hover::after, .btn-amber:hover::after {
  opacity: 1;
  animation: scanlineScroll 0.3s linear infinite;
}

.btn-cyan  { border: 1px solid var(--cyan);  color: var(--cyan); }
.btn-green { border: 1px solid var(--green); color: var(--green); }
.btn-red   { border: 1px solid var(--red);   color: var(--red); }
.btn-muted { border: 1px solid var(--muted); color: var(--muted); }
.btn-amber { border: 1px solid #fbbf24; color: #fbbf24; }

.btn-cyan:hover  { background: var(--cyan);  color: var(--bg); }
.btn-green:hover { background: var(--green); color: var(--bg); }
.btn-red:hover   { background: var(--red);   color: var(--bg); }
.btn-muted:hover { border-color: var(--text); color: var(--text); }
.btn-amber:hover { background: #fbbf24; color: var(--bg); }

/* ─── Paneles ────────────────────────────────────────── */
.cyber-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 1.5rem;
}
.cyber-panel-sm {
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 0.75rem;
}

/* ─── Etiquetas de materia ───────────────────────────── */
.subject-tag {
  font-size: 0.6875rem;
  padding: 0.125rem 0.5rem;
  border: 1px solid;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}
.subject-matematica { border-color: var(--cyan);   color: var(--cyan); }
.subject-geometria  { border-color: #b060ff;        color: #b060ff; }
.subject-logica     { border-color: var(--green);   color: var(--green); }

/* ─── Enunciado ──────────────────────────────────────── */
.statement-text {
  font-family: 'Inter', sans-serif;
  font-size: 1rem;
  line-height: 1.7;
  color: var(--text);
  white-space: pre-wrap;
}

/* ─── Resultado correcto / incorrecto ────────────────── */
.result-correct {
  border: 1px solid var(--green);
  color: var(--green);
  background: rgba(57, 255, 20, 0.05);
}
.result-incorrect {
  border: 1px solid var(--red);
  color: var(--red);
  background: rgba(255, 45, 85, 0.05);
}

/* ─── Tabla admin ────────────────────────────────────── */
.cyber-table { width: 100%; border-collapse: collapse; font-size: 0.8125rem; }
.cyber-table th {
  text-align: left;
  padding: 0.5rem 0.75rem;
  border-bottom: 1px solid var(--cyan);
  color: var(--cyan);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.6875rem;
}
.cyber-table td {
  padding: 0.625rem 0.75rem;
  border-bottom: 1px solid var(--border);
  color: var(--text);
  vertical-align: middle;
}
.cyber-table tr:hover td { background: rgba(255, 255, 255, 0.02); }

/* ─── Título de sección ──────────────────────────────── */
.section-title {
  color: var(--cyan);
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.section-title::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

/* ─── Error / éxito ──────────────────────────────────── */
.error-msg {
  border: 1px solid var(--red);
  color: var(--red);
  background: rgba(255, 45, 85, 0.06);
  padding: 0.5rem 0.75rem;
  font-size: 0.8125rem;
}

/* ─── Opción múltiple ────────────────────────────────── */
.option-label {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.75rem;
  border: 1px solid var(--border);
  cursor: pointer;
  transition: border-color 150ms;
  font-size: 0.875rem;
}
.option-label:hover { border-color: var(--cyan); }
.option-label input[type="radio"] { accent-color: var(--cyan); margin-top: 2px; flex-shrink: 0; }
.option-label.selected { border-color: var(--cyan); background: rgba(0, 245, 255, 0.04); }

/* ─── Pistas ─────────────────────────────────────────── */
.hint-box {
  border-left: 2px solid var(--yellow);
  padding: 0.5rem 0.75rem;
  background: rgba(255, 215, 0, 0.04);
  font-size: 0.8125rem;
  color: var(--text);
}
.hint-label {
  color: var(--yellow);
  font-size: 0.6875rem;
  margin-right: 0.5rem;
}
.hint-counter {
  font-size: 0.6875rem;
  color: var(--muted);
}

/* ─── Animaciones ────────────────────────────────────── */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to   { opacity: 1; transform: translateY(0); }
}
.fade-in { animation: fadeIn 200ms ease-out; }

@keyframes welcomeSlide {
  from { opacity: 0; transform: translateX(-10px); }
  to   { opacity: 1; transform: translateX(0); }
}
@keyframes nameGlow {
  from { opacity: 0; transform: translateX(-6px); text-shadow: none; }
  to   { opacity: 1; transform: translateX(0); text-shadow: 0 0 24px rgba(0,245,255,0.5); }
}

/* ─── Welcome panel ──────────────────────────────────── */
.welcome-panel {
  position: relative;
  overflow: hidden;
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 2px solid var(--cyan);
  padding: 1.25rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.welcome-panel::before {
  content: '';
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 3px,
    rgba(0, 245, 255, 0.018) 3px,
    rgba(0, 245, 255, 0.018) 4px
  );
  pointer-events: none;
  animation: scanlineScroll 0.3s linear infinite;
}
.welcome-label {
  font-size: 0.6875rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  display: block;
  margin-bottom: 0.3rem;
  opacity: 0;
  animation: welcomeSlide 450ms cubic-bezier(0.22,1,0.36,1) 150ms both;
}
.welcome-name {
  font-size: 1.625rem;
  font-weight: 700;
  color: var(--cyan);
  letter-spacing: 0.04em;
  display: block;
  opacity: 0;
  animation: nameGlow 550ms cubic-bezier(0.22,1,0.36,1) 420ms both;
}
.welcome-icon-wrapper {
  position: relative;
  width: 64px;
  height: 64px;
  flex-shrink: 0;
}
.welcome-icon {
  position: absolute;
  inset: 0;
  width: 64px;
  height: 64px;
  filter: invert(1) hue-rotate(180deg) brightness(2);
  mix-blend-mode: screen;
}
.welcome-icon-dynamic {
  opacity: 0;
  animation: fadeIn 500ms ease-out 300ms both;
}
.welcome-icon-hover {
  display: none;
}

/* ═══════════════════════════════════════════════════════
   COMPONENTES REPETIDOS
   ═══════════════════════════════════════════════════════ */

/* Etiqueta de campo de formulario */
.field-label {
  display: block;
  font-size: 0.6875rem;
  color: #7a7a9e;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.375rem;
}

/* Separador de fecha (historial) */
.date-separator {
  color: var(--muted);
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-top: 2rem;
  margin-bottom: 0.75rem;
  padding-bottom: 0.375rem;
  border-bottom: 1px solid var(--border);
}

/* Bloque desplegable — solución (cyan) */
.detail-solution { margin-top: 0.5rem; }
.detail-solution > summary {
  font-size: 0.6875rem;
  color: var(--cyan);
  cursor: pointer;
  list-style: none;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}
.detail-solution > summary::-webkit-details-marker { display: none; }
.detail-solution .detail-body {
  margin-top: 0.5rem;
  padding: 0.5rem;
  font-size: 0.8125rem;
  font-family: 'Inter', sans-serif;
  color: var(--text);
  white-space: pre-wrap;
  line-height: 1.6;
  border-left: 1px solid var(--cyan);
  background: rgba(0, 245, 255, 0.02);
}

/* Bloque desplegable — explicación (muted) */
.detail-explanation { margin-top: 0.5rem; }
.detail-explanation > summary {
  font-size: 0.6875rem;
  color: var(--muted);
  cursor: pointer;
  list-style: none;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}
.detail-explanation > summary::-webkit-details-marker { display: none; }
.detail-explanation .detail-body {
  margin-top: 0.5rem;
  padding: 0.5rem;
  font-size: 0.8125rem;
  font-family: 'Inter', sans-serif;
  color: var(--text);
  white-space: pre-wrap;
  border-left: 1px solid var(--border);
}

/* Bloque desplegable — formulario de edición (admin) */
.detail-edit { margin-top: 0.625rem; }
.detail-edit > summary {
  font-size: 0.6875rem;
  color: var(--muted);
  cursor: pointer;
  list-style: none;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  display: inline-block;
}
.detail-edit > summary::-webkit-details-marker { display: none; }

/* Nota del profe */
.admin-note {
  margin-top: 0.5rem;
  border-left: 2px solid var(--yellow);
  padding: 0.375rem 0.625rem;
  background: rgba(255, 215, 0, 0.04);
}

/* Panel de solución inline (tras responder) */
.solution-panel {
  border: 1px solid var(--cyan);
  background: rgba(0, 245, 255, 0.03);
  padding: 1rem;
  margin-bottom: 0.75rem;
}
.solution-panel .panel-label {
  font-size: 0.6875rem;
  color: var(--cyan);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.5rem;
}
.solution-panel .panel-body {
  font-size: 0.875rem;
  font-family: 'Inter', sans-serif;
  white-space: pre-wrap;
  line-height: 1.6;
  color: var(--text);
}