/* ============ TOKENS & VARIABLES ============ */
:root {
  --rojo: #D6001C;
  --rojo-oscuro: #A6001A;
  --rojo-suave: #FDE7EA;
  --blanco: #FFFFFF;
  --gris-fondo: #F4F6F8;
  --gris-borde: #E5E7EB;
  --gris-texto: #374151;
  --gris-suave: #6B7280;
  --verde: #0F9D58;
  --verde-suave: #E5F7ED;
  --ambar: #B45309;
  --ambar-suave: #FEF3E2;
  --radio: 14px;
  --sombra: 0 4px 16px rgba(17, 24, 39, 0.06);
  --sombra-fuerte: 0 12px 32px rgba(17, 24, 39, 0.12);
  --display: 'Sora', sans-serif;
  --texto: 'Inter', sans-serif;
  --mono: 'Roboto Mono', monospace;
}

*, *::before, *::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

html, body {
  overflow-x: hidden;
}

body {
  margin: 0;
  font-family: var(--texto);
  background: var(--gris-fondo);
  color: var(--gris-texto);
  min-height: 100vh;
  padding-bottom: 60px;
}

/* ============ HEADER ============ */
header.top {
  background: linear-gradient(135deg, var(--rojo) 0%, var(--rojo-oscuro) 100%);
  color: var(--blanco);
  padding: 30px 20px 48px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

header.top::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: 
    radial-gradient(circle at 12% 20%, rgba(255, 255, 255, 0.10) 0, transparent 40%),
    radial-gradient(circle at 88% 80%, rgba(255, 255, 255, 0.08) 0, transparent 45%);
  pointer-events: none;
}

.top-nav-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 980px;
  margin: 0 auto 16px;
  position: relative;
  z-index: 2;
  flex-wrap: wrap;
  gap: 10px;
}

header.top .badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.16);
  border: 1px solid rgba(255, 255, 255, 0.3);
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.btn-icon-head {
  background: rgba(255, 255, 255, 0.16);
  border: 1px solid rgba(255, 255, 255, 0.3);
  color: var(--blanco);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s ease;
  backdrop-filter: blur(8px);
}

.btn-icon-head:hover {
  background: rgba(255, 255, 255, 0.28);
  transform: translateY(-1px);
}

.btn-icon-head:active {
  transform: scale(0.92);
}

header.top h1 {
  font-family: var(--display);
  font-weight: 800;
  font-size: clamp(1.7rem, 4vw, 2.5rem);
  margin: 0 0 8px;
  letter-spacing: -0.02em;
  position: relative;
  z-index: 2;
}

header.top p {
  margin: 0;
  opacity: 0.92;
  font-size: 15px;
  max-width: 580px;
  margin-inline: auto;
  position: relative;
  z-index: 2;
  line-height: 1.5;
}

/* ============ LAYOUT ============ */
main {
  max-width: 980px;
  margin: -26px auto 0;
  padding: 0 18px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  position: relative;
  z-index: 2;
}

.card {
  background: var(--blanco);
  border-radius: var(--radio);
  box-shadow: var(--sombra);
  border: 1px solid var(--gris-borde);
  padding: 24px;
}

.card h2 {
  font-family: var(--display);
  font-size: 1.05rem;
  font-weight: 700;
  margin: 0 0 4px;
  color: #1F2937;
  display: flex;
  align-items: center;
  gap: 10px;
}

.card h2 .num {
  background: var(--rojo-suave);
  color: var(--rojo);
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.card .desc {
  font-size: 13.5px;
  color: var(--gris-suave);
  margin: 0 0 18px;
  line-height: 1.45;
}

/* ============ TABLA EVALUACIONES ============ */
.rows-wrap {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.row-head, .grade-row {
  display: grid;
  grid-template-columns: 1fr 1fr 34px;
  gap: 10px;
  align-items: center;
}

.row-head {
  font-size: 11.5px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--gris-suave);
  padding: 0 4px;
}

.grade-row {
  background: var(--gris-fondo);
  border: 1px solid var(--gris-borde);
  border-radius: 10px;
  padding: 8px;
}

.grade-row input {
  width: 100%;
  border: 1px solid var(--gris-borde);
  background: var(--blanco);
  border-radius: 8px;
  padding: 9px 10px;
  font-size: 14px;
  font-family: var(--texto);
  color: var(--gris-texto);
  transition: border-color .15s, box-shadow .15s;
}

.grade-row input:focus {
  outline: none;
  border-color: var(--rojo);
  box-shadow: 0 0 0 3px var(--rojo-suave);
}

.grade-row input.nota-input,
.grade-row input.peso-input {
  font-family: var(--mono);
  font-weight: 600;
  text-align: center;
}

.grade-row input::placeholder {
  color: #9CA3AF;
  font-weight: 400;
}

.btn-del {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  border: 1px solid var(--gris-borde);
  background: var(--blanco);
  color: #9CA3AF;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  transition: all .15s;
  flex-shrink: 0;
}

.btn-del:hover {
  background: var(--rojo);
  color: var(--blanco);
  border-color: var(--rojo);
}

.rows-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 14px;
  flex-wrap: wrap;
  gap: 10px;
}

.peso-info {
  font-size: 12.5px;
  color: var(--gris-suave);
  font-family: var(--mono);
}

.peso-info.warn { color: var(--ambar); font-weight: 600; }
.peso-info.ok   { color: var(--verde); font-weight: 600; }

.btn {
  font-family: var(--texto);
  font-weight: 600;
  font-size: 14px;
  border-radius: 9px;
  padding: 10px 18px;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform .12s, box-shadow .12s, background .15s;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.btn:active { transform: scale(0.97); }

.btn-primary {
  background: var(--rojo);
  color: var(--blanco);
}
.btn-primary:hover { background: var(--rojo-oscuro); }

.btn-ghost {
  background: var(--blanco);
  color: var(--gris-texto);
  border-color: var(--gris-borde);
}
.btn-ghost:hover {
  border-color: var(--rojo);
  color: var(--rojo);
}

/* ============ EXAMEN TOGGLE ============ */
.toggle-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.toggle-label {
  font-size: 14.5px;
  font-weight: 600;
  color: #1F2937;
}

.toggle-label span {
  display: block;
  font-weight: 400;
  font-size: 12.5px;
  color: var(--gris-suave);
  margin-top: 2px;
}

.switch {
  position: relative;
  width: 50px;
  height: 28px;
  flex-shrink: 0;
}

.switch input { opacity: 0; width: 0; height: 0; }

.slider {
  position: absolute;
  cursor: pointer;
  inset: 0;
  background: #D1D5DB;
  border-radius: 999px;
  transition: .2s;
}

.slider::before {
  content: "";
  position: absolute;
  height: 22px;
  width: 22px;
  left: 3px;
  top: 3px;
  background: var(--blanco);
  border-radius: 50%;
  transition: .2s;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}

input:checked + .slider { background: var(--rojo); }
input:checked + .slider::before { transform: translateX(22px); }

.exam-panel {
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px dashed var(--gris-borde);
  display: none;
  animation: slideDown .25s ease;
}

.exam-panel.visible { display: block; }

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-6px); }
  to   { opacity: 1; transform: translateY(0); }
}

.exam-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.field label {
  font-size: 12px;
  font-weight: 600;
  color: var(--gris-suave);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.field input {
  border: 1px solid var(--gris-borde);
  border-radius: 8px;
  padding: 10px;
  font-family: var(--mono);
  font-weight: 600;
  text-align: center;
  font-size: 14px;
}

.field input:focus {
  outline: none;
  border-color: var(--rojo);
  box-shadow: 0 0 0 3px var(--rojo-suave);
}

/* ============ RESULTADOS ============ */
.results-card {
  background: linear-gradient(160deg, #1F2937 0%, #111827 100%);
  color: var(--blanco);
  border: none;
}

.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 14px;
  margin-top: 14px;
}

.result-box {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 12px;
  padding: 16px;
  text-align: center;
}

.result-box .label {
  font-size: 11.5px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  opacity: 0.65;
  margin-bottom: 8px;
  font-weight: 600;
}

.result-box .value {
  font-family: var(--mono);
  font-size: 1.9rem;
  font-weight: 700;
}

.result-box.final {
  border-color: rgba(214, 0, 28, 0.5);
  background: rgba(214, 0, 28, 0.12);
}

.result-box.final .value {
  color: #FFD6DC;
}

.gauge-wrap {
  display: flex;
  justify-content: center;
  margin: 6px 0 4px;
}

.gauge-status {
  text-align: center;
  font-family: var(--display);
  font-weight: 700;
  font-size: 1.15rem;
  margin-top: -6px;
}

.gauge-status.aprobado { color: #34D399; }
.gauge-status.reprobado { color: #FCA5A5; }

.estado-banner {
  margin-top: 18px;
  border-radius: 12px;
  padding: 16px 18px;
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 14.5px;
}

.estado-banner.aprobado {
  background: var(--verde-suave);
  color: #065F46;
  border: 1px solid #A7F3D0;
}

.estado-banner.riesgo {
  background: var(--ambar-suave);
  color: #92400E;
  border: 1px solid #FCD9A8;
}

.estado-banner .icon {
  font-size: 26px;
  flex-shrink: 0;
}

.estado-banner strong {
  display: block;
  font-size: 15.5px;
  margin-bottom: 2px;
  font-family: var(--display);
}

/* ============ ESCENARIOS ============ */
.scenarios {
  display: none;
  margin-top: 18px;
}

.scenarios.visible { display: block; }

.scenarios .min-needed {
  background: var(--rojo-suave);
  border: 1px solid #F8C2CB;
  border-radius: 12px;
  padding: 14px 16px;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
}

.scenarios .min-needed .txt {
  font-size: 14px;
  color: var(--rojo-oscuro);
  font-weight: 600;
}

.scenarios .min-needed .num {
  font-family: var(--mono);
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--rojo);
}

.scenario-table {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 12px;
}

.scenario-card {
  border: 1px solid var(--gris-borde);
  background: var(--gris-fondo);
  border-radius: 12px;
  padding: 14px;
  text-align: center;
}

.scenario-card .target {
  font-size: 11.5px;
  font-weight: 700;
  color: var(--gris-suave);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 8px;
}

.scenario-card .needed {
  font-family: var(--mono);
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--rojo);
  margin-bottom: 4px;
}

.scenario-card .sub {
  font-size: 11.5px;
  color: var(--gris-suave);
}

.scenario-card.unreachable .needed {
  color: #9CA3AF;
}

footer.note {
  text-align: center;
  font-size: 12px;
  color: var(--gris-suave);
  margin-top: 18px;
  padding: 0 20px;
}

/* ============ MODAL QR ============ */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.78);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-card {
  background: var(--blanco);
  border-radius: 20px;
  padding: 24px;
  width: 100%;
  max-width: 330px;
  text-align: center;
  position: relative;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.25);
  animation: modal-pop 0.25s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

@keyframes modal-pop {
  0% { transform: scale(0.85); opacity: 0; }
  100% { transform: scale(1); opacity: 1; }
}

.modal-close-btn {
  position: absolute;
  top: 14px;
  right: 14px;
  background: transparent;
  border: none;
  color: var(--gris-suave);
  font-size: 1.6rem;
  line-height: 1;
  cursor: pointer;
}

.modal-title {
  font-family: var(--display);
  font-size: 1.2rem;
  font-weight: 800;
  color: #1F2937;
  margin: 0;
}

.modal-desc {
  font-size: 0.82rem;
  color: var(--gris-suave);
  margin: 6px 0 16px;
  line-height: 1.4;
}

.qr-container {
  background: var(--blanco);
  padding: 10px;
  border: 1px solid var(--gris-borde);
  border-radius: 14px;
  display: inline-block;
  margin-bottom: 16px;
}

.qr-container img {
  width: 200px;
  height: 200px;
  display: block;
}

.modal-action-btn {
  width: 100%;
  padding: 11px;
  background: var(--rojo);
  border: none;
  border-radius: 10px;
  color: var(--blanco);
  font-family: var(--texto);
  font-weight: 700;
  font-size: 0.9rem;
  cursor: pointer;
  transition: background .15s;
}

.modal-action-btn:hover {
  background: var(--rojo-oscuro);
}

/* ============ TOASTS Y CONFETI ============ */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(40px);
  background: #1F2937;
  color: var(--blanco);
  padding: 10px 20px;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 600;
  pointer-events: none;
  opacity: 0;
  transition: all 0.28s ease;
  z-index: 1100;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
  white-space: nowrap;
}

.toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

#confetti-canvas {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 999;
}

.felicitacion-toast {
  position: fixed;
  top: 22px;
  left: 50%;
  transform: translateX(-50%) translateY(-30px);
  background: var(--blanco);
  border: 2px solid var(--verde);
  color: #065F46;
  padding: 14px 26px;
  border-radius: 14px;
  box-shadow: var(--sombra-fuerte);
  font-family: var(--display);
  font-weight: 700;
  font-size: 15px;
  z-index: 1000;
  opacity: 0;
  transition: opacity .3s, transform .3s;
  display: flex;
  align-items: center;
  gap: 10px;
}

.felicitacion-toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ============ RESPONSIVE ============ */
@media (max-width: 640px) {
  .row-head { display: none; }
  .grade-row { grid-template-columns: 1fr; }
  .grade-row .btn-del { justify-self: end; }
  .exam-grid { grid-template-columns: 1fr; }
  header.top { padding: 24px 16px 42px; }
  .top-nav-bar { justify-content: center; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}