*, *::before, *::after { 
  box-sizing: border-box; 
  margin: 0; 
  padding: 0; 
}

:root {
  --bg-void: #050b14;       
  --bg-panel: #0d1829;      
  --bg-cell: #15243b;        
  --border-line: #223854;    
  
  --cyan-bright: #00e5ff; 
  --cyan-dim: rgba(0, 229, 255, 0.1);
  --orange-alert: #ff7300;
  --orange-dim: rgba(255, 115, 0, 0.15);
  
  --text-pure: #ffffff; 
  --text-muted: #8ba1b5;  

  --font-sans: 'IBM Plex Sans', sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-void);
  color: var(--text-pure);
  min-height: 100vh;
  
  padding: 3rem 1.5rem; 
  
  line-height: 1.6;

  background-image: 
    linear-gradient(rgba(5, 11, 20, 0.85), rgba(5, 11, 20, 0.25)), 
    url('assets/images/background.webp'),
    linear-gradient(rgba(0, 229, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 229, 255, 0.03) 1px, transparent 1px);
  
  background-size: 100% 100%, cover, 40px 40px, 40px 40px;
  background-position: center, center, center top;
  background-repeat: no-repeat, no-repeat, repeat, repeat;
}

.page {
  max-width: 900px;
  margin: 0 auto;
}

header {
  margin-bottom: 3rem;
  text-align: center;
  position: relative;
}

header h1 {
  font-family: var(--font-mono);
  font-size: 1.8rem;
  font-weight: 600;
  color: var(--text-pure);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  text-shadow: 0 0 20px var(--cyan-dim);
}

header p {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--cyan-bright);
  margin-top: 8px;
  text-transform: uppercase;
  letter-spacing: 0.15em;
}

.card {
  background: var(--bg-panel);
  padding: 2rem;
  margin-bottom: 2rem;
  clip-path: polygon(15px 0, 100% 0, 100% calc(100% - 15px), calc(100% - 15px) 100%, 0 100%, 0 15px);
  border-left: 3px solid var(--cyan-bright);
  position: relative;
}

.card::after {
  content: "";
  position: absolute;
  top: 0; right: 0; bottom: 0; left: 0;
  border: 1px solid var(--border-line);
  pointer-events: none;
}

.card-label {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--cyan-bright);
  margin-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-line);
  padding-bottom: 10px;
}

input[type="number"],
input[type="text"] {
  font-family: var(--font-mono);
  font-size: 1rem; 
  font-weight: 600;
  padding: 10px 14px;
  border: 1px solid var(--border-line);
  border-radius: 0; 
  background: var(--bg-cell);
  color: var(--text-pure);
  outline: none;
  transition: all 0.2s ease;
  width: 100%;
}

input:focus {
  border-color: var(--cyan-bright);
  background: var(--bg-void);
  box-shadow: inset 4px 0 0 var(--cyan-bright);
}

.btn {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 12px 24px;
  border: none;
  cursor: pointer;
  transition: all 0.2s ease;
  clip-path: polygon(10px 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%, 0 10px);
}

.btn-primary {
  background: var(--cyan-dim);
  color: var(--cyan-bright);
  border-bottom: 2px solid var(--cyan-bright);
}

.btn-primary:hover {
  background: var(--cyan-bright);
  color: var(--bg-void);
}

.btn-calc {
  background: var(--orange-dim);
  color: var(--orange-alert);
  border-bottom: 2px solid var(--orange-alert);
  width: 100%;
  font-size: 1.1rem;
  padding: 16px;
  margin-top: 1rem;
}

.btn-calc:hover {
  background: var(--orange-alert);
  color: var(--bg-void);
}

.btn-outline {
  background: transparent;
  color: var(--text-muted);
  border-bottom: 2px solid var(--border-line);
}

.btn-outline:hover {
  color: var(--cyan-bright);
  border-bottom-color: var(--cyan-bright);
  background: var(--cyan-dim);
}

.btn-back {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  font-size: 0.8rem;
  padding: 6px 14px;
  margin-bottom: 1.2rem;
}

.btn .material-symbols-outlined {
  font-size: 1.2em;
  vertical-align: -4px;
  margin-right: 8px;
}

.final-actions {
  display: flex;
  gap: 1.2rem;
  flex-wrap: wrap;
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-line);
}

.final-actions .btn {
  flex: 1 1 220px;
}

.dim-row {
  display: flex;
  align-items: center;
  gap: 2rem;
  flex-wrap: wrap;
}

.dim-row label {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 12px;
}
.dim-row input[type="number"] { width: 90px; text-align: center; }

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}
@media (max-width: 700px) {
  .grid-2 { grid-template-columns: 1fr; }
  .card { padding: 1.25rem; }
  .z-box { flex-direction: column; gap: 0.5rem; text-align: center; padding: 1.5rem; }
  .asig-item { flex-direction: column; align-items: flex-start; gap: 0.5rem; }
}

.nodes-table { width: 100%; border-collapse: separate; border-spacing: 0 6px; }
.nodes-table th {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  text-align: left;
  padding-bottom: 4px;
}
.nodes-table td { padding: 0 4px; }

#costMatrix {
  width: 100%;
  border-collapse: separate;
  border-spacing: 4px; 
}
#costMatrix th {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--cyan-bright);
  padding: 10px;
}
#costMatrix .row-lbl {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--cyan-bright);
  padding-right: 15px;
}
#costMatrix input { text-align: center; }

.res-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-mono);
}

.res-table th, .res-table td {
  border: 1px solid var(--border-line);
  padding: 16px 12px;
  text-align: center;
}

.res-table thead th, .res-table .row-head {
  background: var(--bg-void);
  color: var(--text-muted);
  font-size: 0.8rem;
  text-transform: uppercase;
  font-weight: normal;
}

.res-table .assigned {
  background-color: var(--orange-dim);
  background-image: repeating-linear-gradient(
    -45deg,
    rgba(255, 115, 0, 0.05),
    rgba(255, 115, 0, 0.05) 10px,
    transparent 10px,
    transparent 20px
  );
  border: 2px solid var(--orange-alert);
  position: relative;
}

.cell-cost {
  font-size: 0.75rem;
  color: var(--text-muted);
  display: block;
  text-align: left;
  margin-bottom: 8px;
}

.assigned .cell-cost { color: var(--orange-alert); font-weight: 600; }

.cell-qty {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-pure);
  display: block;
}

.cell-empty {
  color: #3b5068;
  font-size: 0.9rem;
}

.z-box {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 2rem 2.5rem;
  background: var(--bg-void);
  margin-top: 2rem;
  clip-path: polygon(20px 0, calc(100% - 20px) 0, 100% 20px, 100% calc(100% - 20px), calc(100% - 20px) 100%, 20px 100%, 0 calc(100% - 20px), 0 20px);
  border: 2px solid var(--orange-alert);
  position: relative;
}

.z-box::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: linear-gradient(90deg, var(--orange-dim) 0%, transparent 50%);
  pointer-events: none;
}

.z-label {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--text-pure);
  text-transform: uppercase;
  letter-spacing: 0.2em;
  z-index: 1;
}

.z-value {
  font-family: var(--font-mono);
  font-size: 2.5rem;
  font-weight: 600;
  color: var(--orange-alert);
  z-index: 1;
}

.asig-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 20px;
  background: var(--bg-cell);
  border: 1px solid var(--border-line);
  font-family: var(--font-mono);
  font-size: 0.95rem;
  margin-top: 10px;
  border-left: 4px solid var(--orange-alert);
}

.asig-route strong { color: var(--text-pure); }
.asig-route .arrow { color: var(--cyan-bright); margin: 0 16px; font-weight: bold; }
.asig-cost { color: var(--orange-alert); font-weight: 600; }
.msg-error {
  background: rgba(255, 50, 50, 0.1);
  border-left: 4px solid #ff3232;
  color: #ff8080;
  padding: 14px 18px;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  margin-top: 1.5rem;
  display: none;
}

.msg-warn {
  background: rgba(255, 200, 0, 0.1);
  border-left: 4px solid #ffc800;
  color: #ffd740;
  padding: 14px 18px;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  margin-top: 1.5rem;
  display: none;
}

.visible { display: block !important; }
.hidden { display: none !important; }

div[style="overflow-x: auto;"]::-webkit-scrollbar { height: 8px; }
div[style="overflow-x: auto;"]::-webkit-scrollbar-track { background: var(--bg-void); }
div[style="overflow-x: auto;"]::-webkit-scrollbar-thumb {
  background: var(--border-line);
  border-radius: 0;
}
div[style="overflow-x: auto;"]::-webkit-scrollbar-thumb:hover { background: var(--cyan-bright); }