/* ─── Reset & base ─────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:          #0f1117;
  --surface:     #1a1d27;
  --surface2:    #22263a;
  --border:      #2e3350;
  --accent:      #6c63ff;
  --accent-soft: #6c63ff22;
  --success:     #22d3a5;
  --danger:      #ff5f7e;
  --critical:    #ff9f43;
  --text:        #e2e8f0;
  --text-muted:  #7a82a6;
  --edge:        #6b7599;   /* color de flechas modo oscuro */
  --radius:      12px;
  --radius-sm:   8px;
  --shadow:      0 4px 24px #00000055;
  --transition:  .2s ease;
}

/* ─── Modo claro ────────────────────────────────────────────── */
body.light {
  --bg:          #f0f2f8;
  --surface:     #ffffff;
  --surface2:    #e8eaf4;
  --border:      #d0d4e8;
  --accent:      #5b52e8;
  --accent-soft: #5b52e822;
  --success:     #0fa87e;
  --danger:      #e03060;
  --critical:    #d97706;
  --text:        #1a1d2e;
  --text-muted:  #6b7280;
  --edge:        #8892b0;   /* color de flechas modo claro */
  --shadow:      0 4px 24px #00000018;
}

/* Ajustes específicos para modo claro */
body.light .node-box          { fill: #ffffff; }
body.light .node-duration-badge { stroke: var(--success); fill: #f0f2f8; }
body.light .aoa-circle        { fill: #ffffff; }
body.light .node-circle       { fill: #ffffff; }
body.light .node-box.critical { fill: #fff7ed; }
body.light .aoa-circle.critical { fill: #fff7ed; }
body.light .node-circle.critical { fill: #fff7ed; }
body.light .proc-step         { background: #ffffff; }
body.light .proc-formula      { background: var(--surface2); }
body.light .proc-section      { background: var(--surface2); }
body.light .proc-critical-list { color: var(--text-muted); }
body.light .import-textarea   { background: var(--surface2); color: var(--text); }
body.light .modal             { background: var(--surface); }
body.light .modal-body input  { background: var(--surface2); color: var(--text); }
body.light .pred-options-list { background: var(--surface2); }
body.light .file-menu-dropdown { background: var(--surface); }

html, body {
  height: 100%;
  font-family: 'Segoe UI', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  line-height: 1.5;
  transition: background var(--transition), color var(--transition);
}

/* ─── Header ────────────────────────────────────────────────── */
header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 14px 28px 14px 16px;
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 16px;
  width: 100%;
}

/* Botón hamburguesa en el header */
.btn-hamburger {
  font-size: 1.1rem;
  width: 34px;
  height: 34px;
  flex-shrink: 0;
  color: var(--text-muted);
  border-color: transparent;
  background: transparent;
  transition: color var(--transition), background var(--transition);
}

.btn-hamburger:hover { color: var(--accent); background: var(--accent-soft); border-color: var(--accent); }
.btn-hamburger.active { color: var(--accent); background: var(--accent-soft); border-color: var(--accent); }

/* ─── Undo / Redo ───────────────────────────────────────────── */
.undo-redo-group {
  display: flex;
  gap: 4px;
  align-items: center;
}

.btn-undoredo {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  padding: 0;
  color: var(--text-muted);
  border-color: var(--border);
  background: transparent;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition), border-color var(--transition);
}

.btn-undoredo:hover:not(:disabled) {
  color: var(--accent);
  background: var(--accent-soft);
  border-color: var(--accent);
}

.btn-undoredo:disabled {
  opacity: .35;
  cursor: not-allowed;
}

/* Botón cambio de tema */
.btn-theme-toggle {
  width: 34px;
  height: 34px;
  flex-shrink: 0;
  color: var(--text-muted);
  border-color: var(--border);
  background: var(--surface2);
  transition: color var(--transition), background var(--transition), border-color var(--transition);
}

.btn-theme-toggle:hover { color: var(--accent); background: var(--accent-soft); border-color: var(--accent); }

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.logo-icon {
  color: var(--accent);
  font-size: 1.6rem;
}

.accent { color: var(--accent); }

.tagline {
  color: var(--text-muted);
  font-size: .82rem;
  border-left: 1px solid var(--border);
  padding-left: 20px;
  flex: 1;
}

/* ─── Menú Archivo ──────────────────────────────────────────── */
.file-menu {
  position: relative;
  flex-shrink: 0;
}

.file-menu-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 5px 12px;
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-size: .82rem;
  font-weight: 600;
  cursor: pointer;
  transition: color var(--transition), background var(--transition), border-color var(--transition);
  white-space: nowrap;
}

.file-menu-btn:hover,
.file-menu-btn.open {
  color: var(--text);
  background: var(--surface2);
  border-color: var(--border);
}

.file-menu-arrow {
  font-size: .65rem;
  transition: transform var(--transition);
}

.file-menu-btn.open .file-menu-arrow {
  transform: rotate(180deg);
}

.file-menu-dropdown {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  min-width: 220px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 8px 32px #00000066, 0 2px 8px #00000044;
  padding: 6px;
  z-index: 200;
  display: none;
  animation: dropdown-in .15s ease;
}

.file-menu-dropdown.open {
  display: block;
}

@keyframes dropdown-in {
  from { opacity: 0; transform: translateY(-6px) scale(.97); }
  to   { opacity: 1; transform: translateY(0)   scale(1); }
}

.file-menu-item {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 9px 10px;
  background: none;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  text-align: left;
  transition: background var(--transition);
}

.file-menu-item:hover {
  background: var(--surface2);
}

.fm-icon {
  font-size: 1rem;
  width: 20px;
  text-align: center;
  flex-shrink: 0;
  color: var(--text-muted);
}

.fm-text {
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.fm-label {
  font-size: .82rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.2;
}

.fm-hint {
  font-size: .7rem;
  color: var(--text-muted);
  line-height: 1.2;
}

.file-menu-sep {
  height: 1px;
  background: var(--border);
  margin: 4px 0;
}

.file-menu-item--danger .fm-label { color: var(--danger); }
.file-menu-item--danger .fm-icon  { color: var(--danger); }
.file-menu-item--danger:hover { background: #ff5f7e14; }

.file-menu-item:disabled {
  opacity: .38;
  cursor: not-allowed;
  pointer-events: none;
}


.header-brand {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 2px;
  margin-left: auto;
  padding-left: 20px;
  border-left: 1px solid var(--border);
}

.brand-by {
  font-size: .65rem;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--text-muted);
  font-weight: 500;
}

.brand-name {
  font-size: .95rem;
  font-weight: 800;
  letter-spacing: -0.3px;
  color: var(--text);
  line-height: 1;
}

.brand-accent {
  color: var(--accent);
  background: linear-gradient(135deg, var(--accent), #a78bfa);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ─── Layout ────────────────────────────────────────────────── */
main {
  display: flex;
  height: calc(100vh - 57px);
  overflow: hidden;
}

/* ─── Panel resize handle ───────────────────────────────────── */
.panel {
  width: 360px;
  min-width: 220px;
  max-width: 600px;
  background: var(--surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  position: relative;
  flex-shrink: 0;
  transition: width .3s ease, min-width .3s ease, border-color .3s ease;
}

.panel-resize-handle {
  position: absolute;
  top: 0;
  right: -4px;
  width: 8px;
  height: 100%;
  cursor: col-resize;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: center;
}

.panel-resize-handle::after {
  content: '';
  display: block;
  width: 3px;
  height: 40px;
  border-radius: 99px;
  background: var(--border);
  transition: background var(--transition);
}

.panel-resize-handle:hover::after { background: var(--accent); }

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 20px 14px;
  border-bottom: 1px solid var(--border);
}

.panel-header h2 {
  font-size: 1rem;
  font-weight: 600;
}

.panel-header-actions {
  display: flex;
  align-items: center;
  gap: 6px;
}

/* Botón colapsar panel */
.btn-collapse {
  font-size: 1.2rem;
  font-weight: 700;
  line-height: 1;
  color: var(--text-muted);
  transition: color var(--transition), background var(--transition), transform var(--transition);
}

.btn-collapse:hover { color: var(--accent); background: var(--accent-soft); border-color: var(--accent); }

/* Panel colapsado */
.panel.collapsed {
  width: 0 !important;
  min-width: 0 !important;
  border-right: none;
  overflow: hidden;
}

/* ─── Table ─────────────────────────────────────────────────── */
.table-wrapper {
  flex: 1;
  overflow-y: auto;
  padding: 12px 16px;
}

.table-wrapper::-webkit-scrollbar { width: 5px; }
.table-wrapper::-webkit-scrollbar-track { background: transparent; }
.table-wrapper::-webkit-scrollbar-thumb { background: var(--border); border-radius: 99px; }

table {
  width: 100%;
  border-collapse: collapse;
}

thead th {
  text-align: left;
  font-size: .75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--text-muted);
  padding: 6px 8px;
  border-bottom: 1px solid var(--border);
}

tbody tr {
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}

tbody tr:hover { background: var(--surface2); }

tbody td {
  padding: 10px 8px;
  vertical-align: middle;
}

.badge-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 26px;
  height: 26px;
  padding: 0 6px;
  border-radius: 6px;
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 800;
  font-size: .8rem;
  border: 1.5px solid var(--accent);
  letter-spacing: -.3px;
}

.badge-num.sm {
  min-width: 20px;
  height: 20px;
  font-size: .7rem;
  border-radius: 4px;
  padding: 0 4px;
}

.cell-name     { color: var(--text); font-weight: 500; }
.cell-name-sm  { color: var(--text); font-size: .78rem; max-width: 80px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.cell-duration { color: var(--success); font-weight: 600; }
.cell-pred     { font-size: .82rem; }

/* Chips de predecesores */
.pred-chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 20px;
  height: 20px;
  padding: 0 5px;
  border-radius: 4px;
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-size: .72rem;
  font-weight: 700;
  margin-right: 3px;
}

.btn-row-delete {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 1rem;
  padding: 4px 6px;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
}
.btn-row-delete:hover { color: var(--danger); background: #ff5f7e18; }

.btn-row-edit {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: .9rem;
  padding: 4px 6px;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
}
.btn-row-edit:hover { color: var(--accent); background: var(--accent-soft); }

/* ─── Panel actions ─────────────────────────────────────────── */
.panel-actions {
  display: flex;
  gap: 10px;
  padding: 14px 16px;
  border-top: 1px solid var(--border);
}

/* ─── CPM Results ───────────────────────────────────────────── */
.cpm-results {
  border-top: 1px solid var(--border);
  padding: 16px;
  overflow-y: auto;
  flex: 1;           /* ocupa la mitad del espacio disponible */
  min-height: 0;     /* necesario para que flex funcione con overflow */
}

/* Cuando las actividades están colapsadas, el CPM crece solo */
.activities-section {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  flex: 1;           /* mitad del espacio por defecto */
  min-height: 0;
  transition: flex .35s ease, opacity .25s ease, max-height .35s ease;
  max-height: 9999px;
  opacity: 1;
}

.activities-section.collapsed {
  flex: 0 !important;
  max-height: 0 !important;
  opacity: 0;
  pointer-events: none;
}

/* La tabla ocupa el espacio sobrante dentro de activities-section */
.activities-section .table-wrapper {
  flex: 1;
  min-height: 0;
}

.cpm-results::-webkit-scrollbar { width: 5px; }
.cpm-results::-webkit-scrollbar-thumb { background: var(--border); border-radius: 99px; }

.cpm-results h3 {
  font-size: .85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.cpm-results-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
  gap: 8px;
}

/* Botón colapsar actividades */
.btn-collapse-acts {
  width: 28px;
  height: 28px;
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  border-color: var(--border);
  transition: color var(--transition), background var(--transition),
              border-color var(--transition);
  flex-shrink: 0;
}

.btn-collapse-acts svg {
  transition: transform .3s ease;
}

.btn-collapse-acts:hover { color: var(--accent); background: var(--accent-soft); border-color: var(--accent); }

/* Cuando está colapsado: el rect inferior sube y se vuelve el activo */
.btn-collapse-acts.expanded svg {
  transform: rotate(180deg);
}

.cpm-header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

/* Barra entre tabla CPM y procedimiento */
.proc-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin: 12px 0 0;
  padding: 8px 10px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.btn-copy-cpm {
  flex: none !important;
  font-size: .72rem;
  padding: 5px 10px;
}

/* ─── Toggle switch ─────────────────────────────────────────── */
.toggle-switch {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  cursor: pointer;
  user-select: none;
}

.toggle-switch input { display: none; }

.toggle-track {
  position: relative;
  width: 34px;
  height: 18px;
  background: var(--surface2);
  border: 1.5px solid var(--border);
  border-radius: 99px;
  transition: background var(--transition), border-color var(--transition);
  flex-shrink: 0;
}

.toggle-thumb {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--text-muted);
  transition: transform var(--transition), background var(--transition);
}

.toggle-switch input:checked + .toggle-track {
  background: var(--accent-soft);
  border-color: var(--accent);
}

.toggle-switch input:checked + .toggle-track .toggle-thumb {
  transform: translateX(16px);
  background: var(--accent);
}

.toggle-label {
  font-size: .7rem;
  font-weight: 600;
  color: var(--text-muted);
  transition: color var(--transition);
  white-space: nowrap;
}

.toggle-switch:has(input:checked) .toggle-label {
  color: var(--accent);
}

/* ─── Procedimiento matemático ──────────────────────────────── */
.cpm-procedure {
  margin-top: 14px;
  border-top: 1px solid var(--border);
  padding-top: 14px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.proc-section {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.proc-section-title {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  background: var(--surface2);
  border-bottom: 1px solid var(--border);
  font-size: .72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .07em;
  color: var(--text-muted);
}

.proc-section-title .proc-icon {
  font-size: .9rem;
}

.proc-section-title.forward  { color: #60a5fa; border-left: 3px solid #60a5fa; }
.proc-section-title.backward { color: #f472b6; border-left: 3px solid #f472b6; }
.proc-section-title.slack    { color: var(--success); border-left: 3px solid var(--success); }
.proc-section-title.critical { color: var(--critical); border-left: 3px solid var(--critical); }

/* Botón copiar dentro del título de cada paso */
.btn-copy-step {
  margin-left: auto;
  background: none;
  border: 1px solid transparent;
  border-radius: 5px;
  color: inherit;
  opacity: .55;
  cursor: pointer;
  font-size: .8rem;
  padding: 2px 7px;
  line-height: 1;
  transition: opacity var(--transition), background var(--transition), border-color var(--transition);
  flex-shrink: 0;
}

.btn-copy-step:hover {
  opacity: 1;
  background: #ffffff18;
  border-color: currentColor;
}

.proc-steps {
  padding: 10px 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.proc-step {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 8px 10px;
  border-radius: 6px;
  background: var(--surface);
  border: 1px solid var(--border);
  transition: border-color var(--transition);
}

.proc-step.is-critical {
  border-color: #ff9f4344;
  background: #ff9f4308;
}

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

.proc-act-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 20px;
  height: 20px;
  padding: 0 5px;
  border-radius: 4px;
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 800;
  font-size: .7rem;
  border: 1.5px solid var(--accent);
  flex-shrink: 0;
}

.proc-act-badge.critical {
  background: #ff9f4318;
  color: var(--critical);
  border-color: var(--critical);
}

.proc-act-name {
  font-size: .78rem;
  font-weight: 600;
  color: var(--text);
}

.proc-formula {
  font-size: .75rem;
  color: var(--text-muted);
  font-family: 'Consolas', 'Courier New', monospace;
  padding: 4px 8px;
  background: var(--surface2);
  border-radius: 4px;
  border-left: 2px solid var(--border);
  line-height: 1.6;
}

.proc-formula .val-es  { color: #60a5fa; font-weight: 700; }
.proc-formula .val-ef  { color: #34d399; font-weight: 700; }
.proc-formula .val-ls  { color: #f472b6; font-weight: 700; }
.proc-formula .val-lf  { color: #fb923c; font-weight: 700; }
.proc-formula .val-sl  { color: var(--success); font-weight: 700; }
.proc-formula .val-dur { color: var(--text); font-weight: 700; }
.proc-formula .val-crit { color: var(--critical); font-weight: 700; }
.proc-formula .op      { color: var(--text-muted); }

.proc-result {
  font-size: .73rem;
  color: var(--text-muted);
  padding-left: 4px;
}

.proc-result strong { color: var(--text); }

.proc-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 8px 12px;
  border-top: 1px solid var(--border);
  background: var(--surface2);
}

.proc-legend-item {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: .68rem;
  color: var(--text-muted);
}

.proc-legend-dot {
  width: 8px;
  height: 8px;
  border-radius: 2px;
  flex-shrink: 0;
}

.proc-critical-list {
  padding: 10px 12px;
  font-size: .78rem;
  color: var(--text-muted);
  line-height: 1.8;
}

.proc-critical-list .crit-path-arrow {
  color: var(--critical);
  font-weight: 700;
}

.proc-critical-list .crit-act {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 1px 7px;
  border-radius: 4px;
  background: #ff9f4318;
  border: 1px solid #ff9f4344;
  color: var(--critical);
  font-weight: 700;
  font-size: .72rem;
  margin: 0 2px;
}

.cpm-results table {
  font-size: .78rem;
}

.cpm-results thead th {
  font-size: .7rem;
  padding: 4px 6px;
}

.cpm-results tbody td {
  padding: 6px 6px;
}

.cpm-results .critical-row td { color: var(--critical); font-weight: 600; }

.critical-path-label {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 12px;
  font-size: .82rem;
  color: var(--text-muted);
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}
.dot.critical { background: var(--critical); }

/* ─── Buttons ───────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  border: none;
  font-size: .82rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity var(--transition), transform var(--transition), background var(--transition);
  white-space: nowrap;
}

.btn:active { transform: scale(.97); }

.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover { opacity: .88; }

.btn-success {
  background: var(--success);
  color: #0f1117;
  flex: 1;
}
.btn-success:hover { opacity: .88; }

.btn-ghost {
  background: var(--surface2);
  color: var(--text-muted);
  border: 1px solid var(--border);
}
.btn-ghost:hover { color: var(--text); background: var(--border); }

.btn-icon {
  background: var(--surface2);
  color: var(--text);
  border: 1px solid var(--border);
  width: 32px;
  height: 32px;
  padding: 0;
  font-size: 1.1rem;
  border-radius: var(--radius-sm);
}
.btn-icon:hover { background: var(--border); }

/* ─── Canvas section ────────────────────────────────────────── */
.canvas-section {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: var(--bg);
}

.canvas-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 20px;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

.toolbar-hint {
  font-size: .78rem;
  color: var(--text-muted);
}

.toolbar-right {
  display: flex;
  gap: 6px;
}

.canvas-container {
  flex: 1;
  position: relative;
  overflow: hidden;
  cursor: grab;
}

.canvas-container:active { cursor: grabbing; }

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

/* ─── Empty state ───────────────────────────────────────────── */
.empty-state {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  pointer-events: none;
}

.empty-icon {
  font-size: 4rem;
  color: var(--border);
  line-height: 1;
}

.empty-state p {
  text-align: center;
  color: var(--text-muted);
  font-size: .9rem;
  line-height: 1.7;
}

/* ─── SVG nodes ─────────────────────────────────────────────── */
.node-group { cursor: grab; }
.node-group:active { cursor: grabbing; }

.node-circle {
  fill: var(--surface2);
  stroke: var(--accent);
  stroke-width: 2;
  transition: filter .15s;
}

.node-circle.critical {
  stroke: var(--critical);
  fill: #ff9f4318;
}

.node-group:hover .node-circle { filter: drop-shadow(0 0 8px var(--accent)); }
.node-group:hover .node-circle.critical { filter: drop-shadow(0 0 8px var(--critical)); }

.node-label {
  fill: var(--text);
  font-size: 11px;
  font-weight: 600;
  text-anchor: middle;
  dominant-baseline: central;
  pointer-events: none;
  font-family: 'Segoe UI', system-ui, sans-serif;
}

.node-num {
  fill: var(--accent);
  font-size: 13px;
  font-weight: 800;
  text-anchor: middle;
  dominant-baseline: central;
  pointer-events: none;
  font-family: 'Segoe UI', system-ui, sans-serif;
}

.node-duration-badge {
  fill: var(--surface);
  font-size: 10px;
  font-weight: 700;
  text-anchor: middle;
  dominant-baseline: central;
  pointer-events: none;
  font-family: 'Segoe UI', system-ui, sans-serif;
  paint-order: stroke;
  stroke: var(--success);
  stroke-width: 3px;
  stroke-linejoin: round;
}

.node-es, .node-ef, .node-ls, .node-lf {
  font-size: 9px;
  font-weight: 600;
  text-anchor: middle;
  dominant-baseline: central;
  pointer-events: none;
  font-family: 'Segoe UI', system-ui, sans-serif;
}

.node-es { fill: #60a5fa; }
.node-ef { fill: #34d399; }
.node-ls { fill: #f472b6; }
.node-lf { fill: #fb923c; }

.node-box {
  fill: var(--surface2);
  stroke: var(--accent);
  stroke-width: 1.5;
  rx: 8;
}

.node-box.critical {
  stroke: var(--critical);
  fill: #ff9f4310;
}

/* ─── SVG edges ─────────────────────────────────────────────── */
.edge-line {
  fill: none;
  stroke: var(--edge);
  stroke-width: 2;
  marker-end: url(#arrow);
}

.edge-line.critical {
  stroke: var(--critical);
  stroke-width: 2.5;
  marker-end: url(#arrow-critical);
}

.edge-label {
  fill: var(--text-muted);
  font-size: 10px;
  text-anchor: middle;
  dominant-baseline: central;
  pointer-events: none;
  font-family: 'Segoe UI', system-ui, sans-serif;
}

.arrow-head          { fill: var(--edge); }
.arrow-head-critical { fill: var(--critical); }

/* ─── Modal ─────────────────────────────────────────────────── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: #00000088;
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
}

.modal {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  width: 420px;
  max-width: 95vw;
  box-shadow: var(--shadow);
  animation: modal-in .18s ease;
}

@keyframes modal-in {
  from { opacity: 0; transform: scale(.95) translateY(8px); }
  to   { opacity: 1; transform: scale(1)  translateY(0); }
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 20px 14px;
  border-bottom: 1px solid var(--border);
}

.modal-header h3 { font-size: 1rem; font-weight: 600; }

.btn-close {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 1rem;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
}
.btn-close:hover { color: var(--danger); background: #ff5f7e18; }

.modal-body {
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* Badge de número en el modal */
.modal-num-badge-wrap {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

.modal-num-label {
  font-size: .78rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: .06em;
}

.modal-num-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 32px;
  height: 32px;
  padding: 0 10px;
  border-radius: 8px;
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 800;
  font-size: 1rem;
  border: 2px solid var(--accent);
  letter-spacing: -.3px;
}

.modal-body label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: .82rem;
  font-weight: 600;
  color: var(--text-muted);
}

.hint {
  font-weight: 400;
  font-size: .75rem;
  color: var(--text-muted);
}

.modal-body input {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  padding: 10px 12px;
  font-size: .9rem;
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.modal-body input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  padding: 14px 20px 18px;
  border-top: 1px solid var(--border);
}

/* ─── Selector de predecesores ──────────────────────────────── */
.pred-label-row {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: .82rem;
  font-weight: 600;
  color: var(--text-muted);
}

/* Zona de chips seleccionados */
.pred-selected-wrap {
  min-height: 38px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
  padding: 6px 10px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: border-color var(--transition);
}

.pred-selected-wrap:empty::before {
  content: 'Ningún predecesor seleccionado';
  color: var(--text-muted);
  font-size: .8rem;
  font-style: italic;
}

/* Chip seleccionado (con botón de quitar) */
.pred-chip-selected {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 8px 3px 6px;
  border-radius: 6px;
  background: var(--accent-soft);
  border: 1.5px solid var(--accent);
  color: var(--text);
  font-size: .78rem;
  font-weight: 600;
  animation: chip-in .15s ease;
}

@keyframes chip-in {
  from { opacity: 0; transform: scale(.8); }
  to   { opacity: 1; transform: scale(1); }
}

.pred-chip-selected .chip-num {
  color: var(--accent);
  font-weight: 800;
  font-size: .8rem;
}

.pred-chip-selected .chip-name {
  color: var(--text-muted);
  font-size: .74rem;
}

.pred-chip-remove {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: .75rem;
  padding: 0 1px;
  line-height: 1;
  border-radius: 3px;
  transition: color var(--transition);
  display: flex;
  align-items: center;
}
.pred-chip-remove:hover { color: var(--danger); }

/* Lista de opciones disponibles */
.pred-options-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
  max-height: 160px;
  overflow-y: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg);
  padding: 4px;
}

.pred-options-list::-webkit-scrollbar { width: 4px; }
.pred-options-list::-webkit-scrollbar-thumb { background: var(--border); border-radius: 99px; }

.pred-options-list:empty::after {
  content: 'No hay otras tareas disponibles';
  display: block;
  text-align: center;
  color: var(--text-muted);
  font-size: .78rem;
  padding: 12px 8px;
  font-style: italic;
}

/* Fila de opción */
.pred-option-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 7px 10px;
  border-radius: 6px;
  cursor: pointer;
  transition: background var(--transition);
  user-select: none;
}

.pred-option-row:hover { background: var(--surface2); }

.pred-option-row.selected {
  background: var(--accent-soft);
  border: 1px solid var(--accent);
}

.pred-option-row.selected:hover { background: #6c63ff33; }

.pred-opt-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 24px;
  height: 24px;
  padding: 0 5px;
  border-radius: 5px;
  background: var(--surface2);
  border: 1.5px solid var(--border);
  color: var(--accent);
  font-weight: 800;
  font-size: .78rem;
  flex-shrink: 0;
  transition: background var(--transition), border-color var(--transition);
}

.pred-option-row.selected .pred-opt-num {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.pred-opt-name {
  flex: 1;
  font-size: .82rem;
  color: var(--text);
  font-weight: 500;
}

.pred-opt-check {
  font-size: .85rem;
  color: var(--accent);
  opacity: 0;
  transition: opacity var(--transition);
}

.pred-option-row.selected .pred-opt-check { opacity: 1; }

.pred-empty-msg {
  text-align: center;
  color: var(--text-muted);
  font-size: .78rem;
  padding: 14px 8px;
  font-style: italic;
}

/* ─── Panel IO (exportar/importar) ──────────────────────────── */
.panel-io {
  display: flex;
  gap: 8px;
  padding: 10px 16px;
  border-top: 1px solid var(--border);
}

.btn-io {
  flex: 1;
  background: var(--surface2);
  color: var(--text-muted);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 7px 10px;
  font-size: .78rem;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  transition: color var(--transition), border-color var(--transition), background var(--transition);
}

.btn-io:hover { color: var(--text); border-color: var(--accent); background: var(--accent-soft); }

.io-icon { font-size: 1rem; font-weight: 700; }

/* ─── Diagram type toggle ───────────────────────────────────── */
.diagram-type-toggle {
  display: flex;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.type-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: .78rem;
  font-weight: 700;
  padding: 5px 12px;
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
  letter-spacing: .04em;
}

.type-btn:hover { color: var(--text); background: var(--border); }

.type-btn.active {
  background: var(--accent);
  color: #fff;
}

.toolbar-sep {
  width: 1px;
  background: var(--border);
  margin: 4px 4px;
}

/* ─── Modal wide (exportar/importar) ────────────────────────── */
.modal-wide {
  width: 520px;
}

.import-hint {
  font-size: .82rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 4px;
}

.import-hint code {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1px 6px;
  font-size: .78rem;
  color: var(--accent);
  font-family: 'Consolas', monospace;
}

.import-textarea {
  width: 100%;
  min-height: 160px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  padding: 12px;
  font-size: .82rem;
  font-family: 'Consolas', 'Courier New', monospace;
  line-height: 1.6;
  resize: vertical;
  outline: none;
  transition: border-color var(--transition);
}

.import-textarea:focus { border-color: var(--accent); }

.import-error {
  font-size: .8rem;
  color: var(--danger);
  background: #ff5f7e14;
  border: 1px solid #ff5f7e44;
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  margin-top: 4px;
}

/* ─── AOA diagram styles ────────────────────────────────────── */
.aoa-circle {
  fill: var(--surface2);
  stroke: var(--accent);
  stroke-width: 2;
  transition: filter .15s;
}

.aoa-circle.critical {
  stroke: var(--critical);
  fill: #ff9f4318;
}

.aoa-node-group:hover .aoa-circle { filter: drop-shadow(0 0 8px var(--accent)); }
.aoa-node-group:hover .aoa-circle.critical { filter: drop-shadow(0 0 8px var(--critical)); }

.aoa-node-label {
  fill: var(--text);
  font-size: 13px;
  font-weight: 800;
  text-anchor: middle;
  dominant-baseline: central;
  pointer-events: none;
  font-family: 'Segoe UI', system-ui, sans-serif;
}

.aoa-edge-label {
  fill: var(--text);
  font-size: 10px;
  font-weight: 600;
  text-anchor: middle;
  dominant-baseline: central;
  pointer-events: none;
  font-family: 'Segoe UI', system-ui, sans-serif;
}

.aoa-edge-dur {
  fill: var(--success);
  font-size: 9px;
  font-weight: 700;
  text-anchor: middle;
  dominant-baseline: central;
  pointer-events: none;
  font-family: 'Segoe UI', system-ui, sans-serif;
}

.aoa-edge-dur.critical-text { fill: var(--critical); }

/* ─── Nodo AOA expandido (valores CPM) ──────────────────────── */
.aoa-val-key {
  fill: var(--text-muted);
  font-size: 8px;
  font-weight: 700;
  text-anchor: middle;
  dominant-baseline: central;
  pointer-events: none;
  font-family: 'Segoe UI', system-ui, sans-serif;
  text-transform: uppercase;
  letter-spacing: .04em;
}

.aoa-val-num {
  font-size: 11px;
  font-weight: 800;
  text-anchor: middle;
  dominant-baseline: central;
  pointer-events: none;
  font-family: 'Segoe UI', system-ui, sans-serif;
}

.aoa-val-es  { fill: #60a5fa; }
.aoa-val-ef  { fill: #34d399; }
.aoa-val-ls  { fill: #f472b6; }
.aoa-val-lf  { fill: #fb923c; }

.aoa-val-slack {
  font-size: 9px;
  font-weight: 700;
  text-anchor: middle;
  dominant-baseline: central;
  pointer-events: none;
  font-family: 'Segoe UI', system-ui, sans-serif;
}

/* Modo claro: ajustar colores de valores */
body.light .aoa-val-es  { fill: #2563eb; }
body.light .aoa-val-ef  { fill: #059669; }
body.light .aoa-val-ls  { fill: #db2777; }
body.light .aoa-val-lf  { fill: #d97706; }

/* Toggle valores AOA en toolbar */
.aoa-values-toggle {
  margin: 0;
  cursor: pointer;
}

.edge-dummy {
  stroke-dasharray: 6 4;
  opacity: .5;
}

.edge-dummy.critical {
  stroke: var(--critical);
  stroke-width: 2.5;
  marker-end: url(#arrow-critical);
  opacity: .85;
}

/* ─── Responsive ────────────────────────────────────────────── */
@media (max-width: 768px) {
  main { flex-direction: column; }
  .panel { width: 100%; min-width: unset; height: 50vh; border-right: none; border-bottom: 1px solid var(--border); }
  .canvas-section { height: 50vh; }
}

/* ─── Utilities ─────────────────────────────────────────────── */
.hidden { display: none !important; }

/* ─── Modal pequeño (confirmación) ─────────────────────────── */
.modal-sm {
  width: 360px;
}

.confirm-icon {
  font-size: 2.4rem;
  text-align: center;
  margin-bottom: 10px;
}

.confirm-msg {
  font-size: .88rem;
  color: var(--text-muted);
  text-align: center;
  line-height: 1.7;
}

.confirm-msg strong {
  color: var(--text);
}

.btn-danger {
  background: var(--danger);
  color: #fff;
}
.btn-danger:hover { opacity: .88; }

/* ─── Responsive ────────────────────────────────────────────── */
@media (max-width: 768px) {
  main { flex-direction: column; }
  .panel { width: 100% !important; min-width: unset; max-width: unset; height: 50vh; border-right: none; border-bottom: 1px solid var(--border); }
  .canvas-section { height: 50vh; }
  .panel-resize-handle { display: none; }
}