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

:root {
  --bg-primary: #0a0e17;
  --bg-secondary: #111827;
  --bg-card: #1a2233;
  --bg-hover: #1e293b;
  --border: #2a3a52;
  --text-primary: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --critical: #ef4444;
  --warning: #f59e0b;
  --success: #10b981;
  --purple: #8b5cf6;
  --cascade: #f97316;
  --font-mono: "SF Mono", "Fira Code", "Cascadia Code", monospace;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

/* === Header === */
header {
  background: linear-gradient(135deg, var(--bg-secondary) 0%, #0f172a 100%);
  border-bottom: 1px solid var(--border);
  padding: 1.5rem 2rem;
}
.header-content {
  max-width: 1400px; margin: 0 auto;
  display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 1rem;
}
.header-left h1 { font-size: 1.4rem; font-weight: 600; letter-spacing: -0.02em; }
.subtitle { color: var(--text-secondary); font-size: 0.9rem; margin-top: 0.25rem; font-family: var(--font-mono); }
.header-right { text-align: right; display: flex; flex-direction: column; gap: 0.15rem; }
.author { font-weight: 600; color: var(--accent); }
.role { font-size: 0.8rem; color: var(--text-muted); }

main { max-width: 1400px; margin: 0 auto; padding: 1.5rem 2rem 3rem; }

/* === Dashboard === */
.dashboard {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem; margin-bottom: 1.5rem;
}
.card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: 8px;
  padding: 1rem 1.25rem; transition: border-color 0.2s;
}
.card:hover { border-color: var(--accent); }
.card-highlight { border-color: var(--success); background: linear-gradient(135deg, var(--bg-card), rgba(16,185,129,0.06)); }
.card-label {
  font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.05em;
  color: var(--text-muted); margin-bottom: 0.4rem; font-weight: 600;
}
.card-value { font-size: 1.3rem; font-weight: 700; font-family: var(--font-mono); }
.savings { color: var(--success); }

/* === Two Column Layout === */
.two-col {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 1.5rem; margin-bottom: 1.5rem;
}

/* === Panel === */
.panel {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: 8px;
  overflow: hidden;
}
.panel-header {
  display: flex; justify-content: space-between; align-items: center;
  padding: 1rem 1.25rem; border-bottom: 1px solid var(--border);
}
.panel-header h2 { font-size: 1rem; font-weight: 600; }

/* === Buttons === */
.btn {
  padding: 0.45rem 1rem; border: none; border-radius: 6px;
  font-size: 0.8rem; font-weight: 600; cursor: pointer; transition: all 0.15s;
  font-family: var(--font-sans);
}
.btn-accent { background: var(--accent); color: white; }
.btn-accent:hover { background: var(--accent-hover); }
.btn-secondary { background: var(--bg-card); color: var(--text-primary); border: 1px solid var(--border); }
.btn-secondary:hover { background: var(--bg-hover); border-color: var(--accent); }
.btn-icon {
  background: none; border: none; color: var(--text-muted); cursor: pointer;
  font-size: 1rem; padding: 0.2rem 0.4rem; border-radius: 4px; transition: all 0.15s;
}
.btn-icon:hover { color: var(--text-primary); background: var(--bg-hover); }
.btn-delete:hover { color: var(--critical); }

/* === Inventory Stats === */
.inventory-stats {
  display: flex; gap: 1rem; padding: 0.6rem 1.25rem; flex-wrap: wrap;
  border-bottom: 1px solid rgba(42,58,82,0.4); font-size: 0.78rem; color: var(--text-secondary);
}
.stat strong { color: var(--text-primary); }

/* === Data Table === */
.table-wrap { overflow-x: auto; max-height: 480px; overflow-y: auto; }
.data-table { width: 100%; border-collapse: collapse; font-size: 0.78rem; }
.data-table thead { background: var(--bg-secondary); position: sticky; top: 0; z-index: 1; }
.data-table th {
  padding: 0.55rem 0.65rem; text-align: left; font-size: 0.65rem;
  text-transform: uppercase; letter-spacing: 0.04em; color: var(--text-muted);
  font-weight: 600; border-bottom: 1px solid var(--border);
}
.data-table td {
  padding: 0.5rem 0.65rem; border-bottom: 1px solid rgba(42,58,82,0.3); vertical-align: middle;
}
.data-table tbody tr { transition: background 0.15s; }
.data-table tbody tr:hover { background: var(--bg-hover); }
.circuit-id { font-family: var(--font-mono); font-size: 0.72rem; color: var(--text-secondary); }
.total-mrc { font-weight: 600; font-family: var(--font-mono); }
.pop-name { font-size: 0.72rem; color: var(--text-secondary); }
.actions-cell { white-space: nowrap; }

/* Vendor Badges */
.vendor-badge {
  font-size: 0.68rem; padding: 0.15rem 0.45rem; border-radius: 4px;
  font-weight: 600; white-space: nowrap;
}
.vendor-lumen { background: rgba(59,130,246,0.12); color: #60a5fa; }
.vendor-zayo { background: rgba(139,92,246,0.12); color: #a78bfa; }
.vendor-verizon { background: rgba(239,68,68,0.12); color: #f87171; }
.vendor-equinix-fabric { background: rgba(16,185,129,0.12); color: #34d399; }
.vendor-cogent { background: rgba(245,158,11,0.12); color: #fbbf24; }
.vendor-gtt { background: rgba(236,72,153,0.12); color: #f472b6; }
.vendor-telia { background: rgba(99,102,241,0.12); color: #818cf8; }

/* Capacity Badges */
.capacity-badge {
  font-size: 0.7rem; padding: 0.12rem 0.4rem; border-radius: 3px;
  font-family: var(--font-mono); font-weight: 700;
}
.cap-1g { background: rgba(245,158,11,0.12); color: var(--warning); }
.cap-10g { background: rgba(59,130,246,0.12); color: var(--accent); }

/* Utilization Bar */
.util-bar {
  position: relative; width: 60px; height: 16px; background: rgba(42,58,82,0.5);
  border-radius: 3px; overflow: hidden; display: inline-flex; align-items: center;
}
.util-fill {
  position: absolute; top: 0; left: 0; height: 100%; border-radius: 3px;
  transition: width 0.3s;
}
.util-low .util-fill { background: var(--success); opacity: 0.6; }
.util-mid .util-fill { background: var(--warning); opacity: 0.6; }
.util-high .util-fill { background: var(--critical); opacity: 0.6; }
.util-text {
  position: relative; z-index: 1; font-size: 0.6rem; font-family: var(--font-mono);
  font-weight: 700; padding-left: 0.3rem; color: var(--text-primary);
}

/* === Opportunity Cards === */
.opportunity-card {
  border-bottom: 1px solid var(--border); padding: 1.25rem;
  transition: background 0.15s;
}
.opportunity-card:last-child { border-bottom: none; }
.opportunity-card:hover { background: rgba(59,130,246,0.02); }
.opp-header { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 1rem; flex-wrap: wrap; gap: 0.5rem; }
.opp-title { display: flex; align-items: center; gap: 0.6rem; }
.opp-icon { font-size: 1.4rem; color: var(--accent); }
.opp-title h3 { font-size: 0.95rem; font-weight: 600; }
.opp-pop { font-size: 0.75rem; color: var(--text-muted); }
.strategy-badge {
  font-size: 0.65rem; padding: 0.25rem 0.6rem; border-radius: 12px;
  font-weight: 600; text-transform: uppercase; letter-spacing: 0.03em;
}
.strat-upgrade { background: rgba(16,185,129,0.12); color: var(--success); }
.strat-enni { background: rgba(59,130,246,0.12); color: var(--accent); }
.strat-migrate { background: rgba(245,158,11,0.12); color: var(--warning); }

/* Comparison columns */
.opp-comparison {
  display: flex; align-items: center; gap: 1rem; margin-bottom: 1rem;
}
.opp-before, .opp-after {
  flex: 1; padding: 0.75rem; border-radius: 6px;
}
.opp-before { background: rgba(239,68,68,0.05); border: 1px solid rgba(239,68,68,0.12); }
.opp-after { background: rgba(16,185,129,0.05); border: 1px solid rgba(16,185,129,0.12); }
.opp-col-label {
  font-size: 0.6rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.05em; color: var(--text-muted); margin-bottom: 0.4rem;
}
.opp-metric { font-size: 0.8rem; margin-bottom: 0.15rem; }
.opp-metric.dim { color: var(--text-muted); font-size: 0.72rem; }
.opp-metric .per-mo { font-size: 0.65rem; color: var(--text-muted); }
.opp-arrow { font-size: 1.5rem; color: var(--success); flex-shrink: 0; }

/* Savings bar */
.opp-savings-bar {
  display: flex; gap: 1rem; flex-wrap: wrap; padding: 0.65rem 0.75rem;
  background: rgba(16,185,129,0.04); border: 1px solid rgba(16,185,129,0.1);
  border-radius: 6px; margin-bottom: 0.75rem;
}
.opp-savings-item { display: flex; flex-direction: column; }
.opp-savings-item .label { font-size: 0.6rem; text-transform: uppercase; color: var(--text-muted); letter-spacing: 0.03em; }
.opp-savings-item .value { font-size: 0.9rem; font-weight: 700; font-family: var(--font-mono); }
.opp-savings-item .value.nrc { color: var(--critical); }

/* Details/Requirements */
.opp-details { margin-top: 0.5rem; }
.opp-details summary {
  font-size: 0.78rem; color: var(--accent); cursor: pointer;
  font-weight: 600; padding: 0.3rem 0; user-select: none;
}
.opp-details summary:hover { text-decoration: underline; }
.opp-details-content { padding: 0.75rem 0; }
.req-meta {
  display: flex; gap: 1.5rem; margin-bottom: 0.6rem;
  font-size: 0.78rem; color: var(--text-secondary);
}
.risk-low { color: var(--success); }
.risk-medium { color: var(--warning); }
.risk-mediumhigh { color: var(--cascade); }
.strategy-desc { font-size: 0.78rem; color: var(--text-muted); margin-bottom: 0.75rem; font-style: italic; }
.req-list { list-style: none; padding: 0; }
.req-list li {
  padding: 0.3rem 0; font-size: 0.78rem; color: var(--text-secondary);
  display: flex; align-items: flex-start; gap: 0.5rem;
}
.req-check { color: var(--text-muted); }
.nrc-breakdown { margin-top: 0.75rem; }
.nrc-breakdown h4, .circuits-involved h4 {
  font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.04em;
  color: var(--text-muted); margin-bottom: 0.4rem;
}
.nrc-grid {
  display: grid; grid-template-columns: 1fr auto;
  gap: 0.2rem 1rem; font-size: 0.78rem; color: var(--text-secondary);
  max-width: 300px;
}
.nrc-total { font-weight: 700; color: var(--text-primary); border-top: 1px solid var(--border); padding-top: 0.3rem; margin-top: 0.2rem; }
.circuits-involved { margin-top: 0.75rem; }
.circuit-chips { display: flex; flex-wrap: wrap; gap: 0.35rem; }
.circuit-chip {
  font-size: 0.65rem; font-family: var(--font-mono); padding: 0.15rem 0.45rem;
  background: var(--bg-secondary); border: 1px solid var(--border);
  border-radius: 4px; color: var(--text-secondary);
}

/* === Chart === */
.chart-container { padding: 1.25rem; }
.chart-legend {
  display: flex; gap: 1.5rem; flex-wrap: wrap; margin-top: 0.75rem;
  padding-top: 0.75rem; border-top: 1px solid rgba(42,58,82,0.3);
}
.legend-item { display: flex; align-items: center; gap: 0.4rem; font-size: 0.75rem; color: var(--text-secondary); }
.legend-dot { width: 10px; height: 10px; border-radius: 50%; flex-shrink: 0; }

/* Projection summary */
.projection-summary { padding: 0 1.25rem 1.25rem; }
.proj-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 1rem; }
.proj-item { display: flex; flex-direction: column; }
.proj-label { font-size: 0.68rem; text-transform: uppercase; color: var(--text-muted); letter-spacing: 0.03em; }
.proj-value { font-size: 1.1rem; font-weight: 700; font-family: var(--font-mono); }

.empty-state { padding: 2rem; text-align: center; color: var(--text-muted); font-size: 0.85rem; }

/* === Modal === */
.modal {
  position: fixed; inset: 0; background: rgba(0,0,0,0.7);
  display: flex; align-items: center; justify-content: center;
  z-index: 100; backdrop-filter: blur(4px);
}
.modal.hidden { display: none; }
.modal-content {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: 12px;
  padding: 1.5rem 2rem; min-width: 500px; max-width: 600px;
}
.modal-content h3 { margin-bottom: 1rem; font-size: 1.1rem; }
.modal-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem;
}
.modal-field { display: flex; flex-direction: column; gap: 0.25rem; }
.modal-field label { font-size: 0.72rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.03em; }
.modal-field input, .modal-field select {
  padding: 0.45rem 0.6rem; background: var(--bg-secondary); color: var(--text-primary);
  border: 1px solid var(--border); border-radius: 6px; font-size: 0.85rem;
  font-family: var(--font-sans);
}
.modal-field input:focus, .modal-field select:focus { outline: none; border-color: var(--accent); }
.modal-actions { display: flex; gap: 0.75rem; margin-top: 1.25rem; }

/* === Footer === */
footer {
  text-align: center; padding: 2rem; color: var(--text-muted);
  font-size: 0.8rem; border-top: 1px solid var(--border);
}
footer a { color: var(--accent); text-decoration: none; }
footer a:hover { text-decoration: underline; }

/* === Responsive === */
@media (max-width: 1024px) {
  .two-col { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
  header { padding: 1rem; }
  main { padding: 1rem; }
  .dashboard { grid-template-columns: repeat(2, 1fr); }
  .header-content { flex-direction: column; align-items: flex-start; }
  .header-right { text-align: left; }
  .modal-content { min-width: auto; margin: 1rem; }
  .modal-grid { grid-template-columns: 1fr; }
  .opp-comparison { flex-direction: column; }
  .opp-arrow { transform: rotate(90deg); align-self: center; }
}