/* ===== FULL-BLEED: anula el padding del main en esta página ===== */
main:has(#graph-wrapper) {
  padding: 0 !important;
  overflow: hidden !important;
}

#graph-wrapper {
  height: 100%;
  min-height: 100dvh;
}

:root {
  --navy-100:   #e0f2fe;
  --navy-200:   #bae6fd;
  --navy-300:   #7dd3fc;
  --navy-400:   #38bdf8;
  --navy-500:   #0ea5e9;
  --navy-600:   #0284c7;
  --navy-700:   #0369a1;
  --navy-800:   #075985;
  --navy-900:   #0c4a6e;
  --navy-950:   #082f49;
  
  --fuchsia-300: #93c5fd; 
  --fuchsia-400: #60a5fa;
  --fuchsia-600: #2563eb;
  
  --green-300:  #86efac;
  --green-400:  #4ade80;
  --green-500:  #22c55e;
  
  --blue-300:   #cbd5e1;
  --blue-400:   #94a3b8;
  --blue-500:   #64748b;
  
  --slate-50:   #f8fafc;
  --slate-100:  #f1f5f9;
  --slate-200:  #e2e8f0;
  --slate-300:  #cbd5e1;
  --slate-400:  #94a3b8;
  --slate-500:  #64748b;
  --slate-600:  #475569;
  --slate-700:  #334155;
  --slate-800:  #1e293b;
  --slate-900:  #0f172a;

  /* Equivalente a rounded-sm de Tailwind */
  --radius-sm:  4px; 
  --radius-md:  6px; 
}

#header-text { min-width: 0; }

#career-name {
  font-size: 15px;
  font-weight: 700;
  color: var(--slate-900);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  line-height: 1.2;
}

#career-stats {
  font-size: 12px;
  color: var(--slate-400);
  margin-top: 2px;
  display: flex;
  align-items: center;
  gap: 0;
}

.stat-pill {
  display: inline-flex;
  align-items: center;
  gap: 3px;
}

.stat-pill:empty { display: none; }

.stat-pill + .stat-pill:not(:empty)::before {
  content: '·';
  margin: 0 6px;
  color: var(--slate-300);
}

/* ===== SELECTOR DE CARRERA ===== */
#selector-wrapper {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

#selector-label {
  font-size: 12px;
  color: var(--slate-400);
  font-weight: 500;
  white-space: nowrap;
}

#career-selector { display: none; }

#custom-select {
  position: relative;
}

#custom-select-btn {
  font-family: inherit;
  font-size: 13px;
  font-weight: 500;
  color: var(--slate-700);
  background: var(--slate-50);
  border: 1.5px solid var(--slate-200);
  border-radius: var(--radius-sm); /* rounded-sm */
  padding: 7px 32px 7px 12px;
  cursor: pointer;
  outline: none;
  -webkit-appearance: none;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  transition: border-color 0.15s, box-shadow 0.15s;
  max-width: 270px;
  width: 100%;
  text-align: left;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

#custom-select-btn:hover { border-color: var(--navy-500); }
#custom-select-btn:focus-visible {
  border-color: var(--navy-600);
  box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.12);
}

#custom-select-list {
  position: absolute;
  top: 100%;
  right: 0;
  z-index: 9999;
  min-width: 220px;
  max-height: 300px;
  overflow-y: auto;
  background: #ffffff;
  border: 1px solid var(--slate-200);
  border-radius: var(--radius-sm); /* rounded-sm */
  padding: 4px;
  box-shadow: 0 12px 40px rgba(0,0,0,0.13), 0 4px 12px rgba(0,0,0,0.06);
  margin-top: 4px;
  list-style: none;
}

#custom-select-list li {
  font-size: 13px;
  font-weight: 500;
  color: var(--slate-700);
  padding: 8px 12px;
  border-radius: var(--radius-sm); /* rounded-sm */
  cursor: pointer;
  transition: background 0.1s;
}

#custom-select-list li:hover { background: var(--slate-100); }
#custom-select-list li.selected {
  background: var(--navy-100);
  color: var(--navy-800);
  font-weight: 600;
}

/* ===== RESPONSIVE MÓVIL ===== */
@media (max-width: 767px) {
  #header-left {
    flex: 1 1 auto;
    min-width: 0;
  }

  #career-name {
    font-size: 14px;
  }

  #career-stats {
    font-size: 11px;
    flex-wrap: wrap;
  }

  #selector-wrapper {
    width: 100%;
    flex-shrink: 1;
  }

  #selector-label {
    display: none;
  }

  #custom-select-btn {
    max-width: none;
  }
}

/* ===== CONTENEDOR DEL GRAFO ===== */
#graph-container {
  flex: 1;
  position: relative;
  overflow: hidden;
}

#graph-container svg {
  width: 100%;
  height: 100%;
  display: block;
}

/* ===== LOADING OVERLAY ===== */
#loading-overlay {
  position: absolute;
  inset: 0;
  background: rgba(248,250,252,0.88);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 50;
  gap: 14px;
  transition: opacity 0.3s ease;
}

#loading-overlay.hidden {
  opacity: 0;
  pointer-events: none;
}

.spinner {
  width: 36px;
  height: 36px;
  border: 3px solid var(--slate-200);
  border-top-color: var(--navy-500);
  border-radius: 50%;
  animation: spin 0.75s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

#loading-text {
  font-size: 13px;
  color: var(--slate-400);
  font-weight: 500;
}

/* ===== TOOLTIP FLOTANTE ===== */
#node-tooltip {
  position: fixed;
  background: #ffffff;
  border: 1px solid var(--slate-200);
  border-radius: var(--radius-sm); /* rounded-sm */
  padding: 10px 14px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.10), 0 2px 6px rgba(0,0,0,0.06);
  pointer-events: none;
  z-index: 2000;
  max-width: 240px;
  opacity: 0;
  transform: translateY(4px);
  transition: opacity 0.15s ease, transform 0.15s ease;
}

#node-tooltip.visible {
  opacity: 1;
  transform: translateY(0);
}

@media (hover: none) and (pointer: coarse) {
  #node-tooltip {
    display: none;
  }
}

#tooltip-name {
  font-size: 13px;
  font-weight: 600;
  color: var(--slate-800);
  line-height: 1.35;
  margin-bottom: 7px;
}

.tooltip-meta {
  display: flex;
  align-items: center;
  gap: 5px;
  flex-wrap: wrap;
}

.tooltip-chip {
  font-size: 11px;
  color: var(--slate-500);
  background: var(--slate-100);
  border-radius: var(--radius-sm); /* rounded-sm */
  padding: 2px 7px;
  font-weight: 500;
}

.tooltip-badge {
  font-size: 10px;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: var(--radius-sm); /* rounded-sm */
  letter-spacing: 0.06em;
}

.badge-OBL { background: #ede9fe; color: #5b21b6; }
.badge-ELE { background: #fce7f3; color: #9d174d; }
.badge-OPT { background: #d1fae5; color: #065f46; }

/* ===== SEMESTER TITLE HOVER ===== */
.semester-title { transition: opacity 0.15s, fill 0.15s; }
.semester-title:hover { opacity: 0.65; fill: var(--slate-500); cursor: default; }

/* ===== LEYENDA ADAPTABLE ===== */
#graph-legend {
  position: fixed;
  bottom: 12px;
  right: 12px;
  background: #ffffff;
  border: 1px solid var(--slate-200);
  border-radius: var(--radius-sm); /* rounded-sm */
  padding: 8px 12px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.07);
  z-index: 100;
  min-width: 140px;
}

#legend-title {
  font-size: 9px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.10em;
  color: var(--slate-400);
  margin-bottom: 6px;
}

.legend-section { margin-bottom: 0; }

.legend-section-title {
  font-size: 9px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--navy-600);
  margin-bottom: 5px;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 10px;
  color: var(--slate-600);
  margin-bottom: 3px;
}
.legend-item:last-child { margin-bottom: 0; }

/* Visibilidad condicional según dispositivo */
.touch-only { display: none; }
.desktop-only { display: block; }

@media (hover: none) and (pointer: coarse) {
  .touch-only { display: block; }
  .desktop-only { display: none; }
}

/* ===== MODAL ===== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(2, 8, 23, 0.6);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  animation: overlayIn 0.2s ease;
}

@keyframes overlayIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

.modal-content {
  width: min(560px, 94vw);
  max-height: 88vh;
  overflow-y: auto;
  background: linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
  border: 1.5px solid var(--slate-300);
  border-radius: var(--radius-sm); /* rounded-sm */
  box-shadow: 0 24px 70px rgba(15, 23, 42, 0.2);
  position: relative;
  animation: modalIn 0.28s cubic-bezier(0.34, 1.4, 0.64, 1);
  overflow: hidden;
}

@keyframes modalIn {
  from { opacity: 0; transform: translateY(28px) scale(0.96); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}

.modal-header {
  background: linear-gradient(135deg, #2f4c6d 0%, #1f3550 100%);
  padding: 22px 24px 20px;
  position: relative;
}

.modal-header::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(255,255,255,0.12), transparent 45%, rgba(255,255,255,0.08));
  pointer-events: none;
}

.modal-badge-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
  position: relative;
  z-index: 1;
}

.modal-type-badge {
  font-size: 11px;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: var(--radius-sm); /* rounded-sm */
  letter-spacing: 0.06em;
  background: rgba(255,255,255,0.22);
  color: white;
  border: 1px solid rgba(255,255,255,0.3);
}

.modal-sem-badge {
  font-size: 11px;
  font-weight: 600;
  color: rgba(255,255,255,0.82);
}

.modal-title {
  font-size: 20px;
  font-weight: 700;
  color: white;
  line-height: 1.3;
  margin: 0;
  position: relative;
  z-index: 1;
  padding-right: 36px;
}

.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 32px;
  height: 32px;
  border: none;
  background: rgba(255,255,255,0.18);
  border-radius: var(--radius-sm); /* rounded-sm */
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: white;
  font-size: 15px;
  transition: background 0.15s, transform 0.15s;
  line-height: 1;
  font-family: inherit;
  z-index: 1;
}
.modal-close:hover {
  background: rgba(255,255,255,0.3);
  transform: scale(1.04);
}

.modal-body {
  padding: 20px 24px 24px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.modal-stats-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.modal-stat-card {
  background: linear-gradient(180deg, #f8fafc 0%, #f1f5f9 100%);
  border: 1.5px solid var(--slate-200);
  border-radius: var(--radius-sm); /* rounded-sm */
  padding: 12px 10px;
  text-align: center;
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.7);
}

.modal-stat-value {
  font-size: 20px;
  font-weight: 700;
  color: #3f638a;
  line-height: 1;
  margin-bottom: 4px;
}

.modal-stat-label {
  font-size: 10px;
  color: var(--slate-400);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.modal-section-title {
  font-size: 10px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--slate-500);
  margin-bottom: 6px;
}

.modal-desc {
  font-size: 14px;
  color: var(--slate-600);
  line-height: 1.65;
  margin: 0;
  padding: 12px 14px;
  background: #f8fafc;
  border: 1.5px solid var(--slate-200);
  border-radius: var(--radius-sm); /* rounded-sm */
}

.modal-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.prereq-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-weight: 600;
  color: #2f4c6d;
  background: linear-gradient(180deg, #e6edf5 0%, #cddaea 100%);
  border: 1.5px solid #a9c1da;
  border-radius: var(--radius-md); /* rounded-sm */
  padding: 6px 12px;
  cursor: pointer;
  transition: transform 0.12s, box-shadow 0.15s, background 0.15s;
  font-family: inherit;
}

.prereq-chip:hover {
  background: linear-gradient(180deg, #cddaea 0%, #b8cfe3 100%);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(47, 76, 109, 0.16);
}

.prereq-chip::before {
  content: '↗';
  font-size: 11px;
  opacity: 0.85;
}

.modal-no-prereqs {
  font-size: 13px;
  color: var(--slate-400);
  font-style: italic;
  margin: 0;
}

.modal-warning {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: 13px;
  color: #92400e;
  background: linear-gradient(180deg, #fef3c7 0%, #fde68a 100%);
  border: 1.5px solid #fcd34d;
  border-radius: var(--radius-sm); /* rounded-sm */
  padding: 10px 12px;
  line-height: 1.5;
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.4);
}

.modal-prereqs {
  margin-top: 0;
  padding-top: 20px;
  border-top: 1.5px solid var(--slate-200);
}

/* ===== MODAL RESPONSIVE ===== */
@media (max-width: 767px) {
  .modal-content {
    width: 94vw;
    margin: 12px;
    border-radius: var(--radius-sm); /* rounded-sm */
  }

  .modal-header {
    padding: 16px 18px 14px;
  }

  .modal-body {
    padding: 16px 18px;
    gap: 12px;
  }

  .modal-stats-row {
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
  }

  .modal-stat-card {
    padding: 10px 6px;
  }

  .modal-stat-value {
    font-size: 17px;
  }

  .modal-title {
    font-size: 17px;
    padding-right: 32px;
  }

  .modal-desc {
    font-size: 13px;
    padding: 10px 12px;
  }

  .prereq-chip {
    padding: 7px 12px;
    font-size: 12px;
  }

  .modal-warning {
    font-size: 12px;
    padding: 8px 10px;
  }
}

/* ================= VISTA POR SEMESTRE (MOBILE UNIFICADA CON DESKTOP) ================= */
#mobile-semester-view {
  display: none;
}

.semester-tabbar {
  background: #ffffff;
  border-bottom: 1.5px solid var(--slate-200);
}

.semester-tab {
  font-size: 12px;
  font-weight: 600;
  padding: 5px 14px;
  border-radius: var(--radius-sm); /* rounded-sm */
  border: 1.5px solid var(--slate-300);
  background: var(--slate-50);
  color: var(--slate-600);
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.15s;
  font-family: inherit;
  flex-shrink: 0;
}

.semester-tab:active {
  transform: scale(0.96);
}

.semester-tab.active {
  background: #2f4c6d;
  border-color: #2f4c6d;
  color: #ffffff;
}

.no-scrollbar::-webkit-scrollbar {
  display: none;
}
.no-scrollbar {
  -ms-overflow-style: none;
  scrollbar-width: none;
}

/* CARDS MOBILE DE MATERIAS */
.semester-card {
  background: #ffffff;
  border: 1.5px solid var(--slate-300); /* Borde idéntico al nodo SVG desktop */
  border-radius: var(--radius-sm); /* rounded-sm */
  padding: 14px 16px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.04);
  cursor: pointer;
  transition: box-shadow 0.15s, transform 0.1s, border-color 0.15s;
}

.semester-card:active {
  transform: scale(0.98);
  border-color: #557fab;
  box-shadow: 0 1px 2px rgba(0,0,0,0.06);
}

.semester-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 8px;
}

.semester-card-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--slate-900);
  line-height: 1.35;
  flex: 1;
}

.semester-card-badge {
  font-size: 10px;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: var(--radius-sm); /* rounded-sm */
  letter-spacing: 0.06em;
  flex-shrink: 0;
  margin-top: 1px;
}

.semester-card-meta {
  display: flex;
  align-items: center;
  gap: 3px;
  font-size: 12px;
  color: var(--slate-500);
  margin-bottom: 8px;
}

.semester-card-meta .meta-sep {
  color: var(--slate-300);
  margin: 0 4px;
}

.semester-card-prereqs {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
}

.semester-prereq-chip {
  font-size: 11px;
  font-weight: 500;
  padding: 3px 9px;
  border-radius: var(--radius-sm); /* rounded-sm */
  background: var(--slate-100);
  color: #2f4c6d;
  border: 1px solid var(--slate-300);
  cursor: pointer;
  font-family: inherit;
  transition: background 0.12s;
}

.semester-prereq-chip:active {
  background: var(--slate-200);
}

.semester-card-no-prereqs {
  font-size: 11px;
  color: var(--slate-400);
  font-style: italic;
}

.toggle-graph {
  background: #e6edf5;
  color: #3f638a;
  border: 1.5px solid #a9c1da;
  border-radius: var(--radius-sm); /* rounded-sm */
}

@media (max-width: 767px) {
  #graph-container {
    flex: 1;
    position: relative;
    overflow: hidden;
  }
  #mobile-semester-view {
    display: flex !important;
  }
}

/* ================= DARK MODE OVERRIDES ================= */
#graph-wrapper {
  background: #f4f7fb;
}
.dark #graph-wrapper,
.dark #graph-container {
  background: var(--slate-900);
}
.dark #app-header {
  background: var(--slate-800);
  border-color: var(--slate-700);
}
.dark #career-name, .dark #legend-title {
  color: var(--slate-50);
}
.dark #selector-label, .dark #stat-semesters, .dark .stat-pill, .dark .legend-item {
  color: var(--slate-400);
}
.dark #custom-select-btn {
  background: var(--slate-900);
  border-color: var(--slate-700);
  color: var(--slate-50);
}
.dark #custom-select-list {
  background: var(--slate-800);
  border-color: var(--slate-700);
}
.dark #custom-select-list li {
  color: var(--slate-50);
}
.dark #custom-select-list li:hover {
  background: var(--slate-700);
}
.dark #custom-select-list li.selected {
  background: var(--navy-900);
  color: var(--navy-300);
}
.dark #graph-legend {
  background: var(--slate-800);
  border-color: var(--slate-700);
  box-shadow: 0 4px 16px rgba(0,0,0,0.5);
}
.dark #loading-overlay {
  background: rgba(15, 23, 42, 0.88);
}
.dark #loading-text {
  color: var(--slate-50);
}
.dark #node-tooltip {
  background: var(--slate-800);
  border-color: var(--slate-700);
}
.dark #tooltip-name {
  color: var(--slate-50);
}
.dark .tooltip-chip {
  background: var(--slate-900);
  color: var(--slate-400);
}
.dark .modal-content {
  background: var(--slate-800);
  border-color: var(--slate-700);
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.6);
}
.dark .modal-header {
  background: linear-gradient(135deg, #1f3550 0%, #142536 100%);
}
.dark .modal-desc {
  background: var(--slate-900);
  border-color: var(--slate-700);
  color: var(--slate-50);
}
.dark .modal-stat-card {
  background: var(--slate-900);
  border-color: var(--slate-700);
  box-shadow: none;
}
.dark .modal-stat-value {
  color: var(--navy-300);
}
.dark .modal-title {
  color: var(--slate-50);
}
.dark .prereq-chip {
  background: linear-gradient(180deg, #1f3550 0%, #142536 100%);
  border-color: #2f4c6d;
  color: #93c5fd;
}

.dark .prereq-chip:hover {
  background: linear-gradient(180deg, #2f4c6d 0%, #1f3550 100%);
  box-shadow: 0 6px 16px rgba(147, 197, 253, 0.12);
}

.dark .modal-prereqs {
  border-top-color: var(--slate-700);
}

/* ===== DARK MODE - VISTA SEMESTRES (MOBILE) ===== */
.dark .semester-tabbar {
  background: var(--slate-800);
  border-bottom-color: var(--slate-700);
}

.dark .semester-tab {
  background: var(--slate-900);
  border-color: var(--slate-700);
  color: var(--slate-400);
}

.dark .semester-tab.active {
  background: #2f4c6d;
  border-color: #2f4c6d;
  color: #ffffff;
}

.dark .semester-card {
  background: var(--slate-800);
  border-color: var(--slate-700);
  box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}

.dark .semester-card-name {
  color: var(--slate-50);
}

.dark .semester-card-meta {
  color: var(--slate-400);
}

.dark .semester-card-meta .meta-sep {
  color: var(--slate-600);
}

.dark .semester-prereq-chip {
  background: var(--slate-900);
  border-color: var(--slate-700);
  color: var(--navy-300);
}

.dark .semester-prereq-chip:active {
  background: var(--slate-700);
}

.dark .toggle-graph {
  background: #1f3550;
  color: #93c5fd;
  border-color: #2f4c6d;
}