:root {
  --bg: #0b0f14;
  --panel: #111821;
  --panel-2: #151e29;
  --line: #263241;
  --text: #edf4fb;
  --muted: #91a0b2;
  --accent: #4db3ff;
  --accent-2: #8c73ff;
  --good: #61d6a3;
  --warn: #ffce6e;
  --danger: #ff6d85;
  --radius: 14px;
  --shadow: 0 18px 45px rgba(0,0,0,.24);
}

* { box-sizing: border-box; }
html { color-scheme: dark; }
body {
  margin: 0;
  background: linear-gradient(180deg,#080c11 0%,#0b1017 42%,#090d12 100%);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.5;
}

button, input, select { font: inherit; }
button, select, input { color: var(--text); }

.topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  display: grid;
  grid-template-columns: minmax(0,1fr) auto minmax(0,1fr);
  align-items: center;
  gap: 24px;
  padding: 14px clamp(16px, 4vw, 54px);
  border-bottom: 1px solid rgba(255,255,255,.08);
  background: rgba(8,12,17,.92);
  backdrop-filter: blur(16px);
}
.brand-wrap { display: flex; align-items: center; gap: 12px; min-width: 0; grid-column: 1; justify-self: start; }
.brand-mark {
  width: 42px; height: 42px; border-radius: 10px;
  display: grid; place-items: center; font-weight: 800; letter-spacing: -.04em;
  background: linear-gradient(135deg,var(--accent),var(--accent-2)); color: #07101a;
  box-shadow: 0 0 0 1px rgba(255,255,255,.16) inset;
}
.brand { font-weight: 760; letter-spacing: -.02em; }
.subtitle { color: var(--muted); font-size: 12px; }
.nav { display: flex; align-items: center; gap: 8px; grid-column: 2; justify-self: center; }
.nav a {
  color: var(--muted); text-decoration: none; padding: 9px 13px; border-radius: 9px;
  font-size: 14px; font-weight: 650;
}
.nav a:hover, .nav a.active { color: var(--text); background: rgba(77,179,255,.12); }

.page { width: min(1500px, calc(100% - 30px)); margin: 24px auto 54px; }
.panel {
  background: linear-gradient(180deg,rgba(21,30,41,.96),rgba(14,21,30,.98));
  border: 1px solid rgba(255,255,255,.075);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.controls-panel, .results-panel, .pattern-panel, .formula-intro { padding: 20px; }
.section-head, .editor-head {
  display: flex; align-items: flex-start; justify-content: space-between; gap: 20px; margin-bottom: 16px;
}
h1, h2, p { margin-top: 0; }
h1 { margin-bottom: 0; font-size: clamp(24px,3vw,34px); letter-spacing: -.035em; }
h2 { margin-bottom: 0; font-size: 19px; letter-spacing: -.02em; }
.eyebrow { margin-bottom: 4px; color: var(--accent); font-size: 11px; letter-spacing: .12em; text-transform: uppercase; font-weight: 800; }
.status-pill {
  padding: 7px 10px; border-radius: 999px; background: rgba(97,214,163,.1); border: 1px solid rgba(97,214,163,.22);
  color: var(--good); font-size: 12px; font-weight: 700;
}

.control-grid {
  display: grid;
  grid-template-columns: repeat(7,minmax(115px,1fr));
  gap: 12px;
}
.field, .compact-field { display: flex; flex-direction: column; gap: 6px; min-width: 0; }
.field > span, .compact-field > span { color: var(--muted); font-size: 12px; font-weight: 650; }
select, input[type="number"] {
  width: 100%; min-height: 42px; border: 1px solid var(--line); border-radius: 9px;
  background: #0d141c; padding: 9px 10px; outline: none;
}
select:focus, input:focus, button:focus-visible { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(77,179,255,.14); outline: none; }
input[type="range"] { accent-color: var(--accent); min-height: 34px; }
.assumption-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.assumption-row span { font-size: 11px; color: var(--muted); padding: 5px 8px; border: 1px solid var(--line); border-radius: 999px; background: rgba(255,255,255,.018); }

.editors-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 16px; }
.editor-panel { padding: 18px; min-width: 0; }
.legend-inline { display: flex; gap: 7px; align-items: center; color: var(--muted); font-size: 12px; white-space: nowrap; }
.legend-dot { width: 9px; height: 9px; border-radius: 50%; }
.amplitude-dot { background: var(--accent); }
.phase-dot { background: var(--accent-2); }
.toolbar, .steer-row, .pattern-controls { display: flex; flex-wrap: wrap; gap: 9px; align-items: end; }
.toolbar { margin-bottom: 12px; }
.compact-field { min-width: 112px; }
.brush-control { min-width: 130px; }
.btn {
  min-height: 42px; border: 1px solid rgba(77,179,255,.32); border-radius: 9px; padding: 9px 13px;
  background: rgba(77,179,255,.14); color: #dff2ff; cursor: pointer; font-weight: 700; font-size: 13px;
}
.btn:hover { background: rgba(77,179,255,.2); }
.btn.secondary { background: rgba(255,255,255,.035); border-color: var(--line); color: var(--muted); }
.btn.secondary:hover { color: var(--text); background: rgba(255,255,255,.07); }
.steer-row { margin: -2px 0 12px; padding: 10px; border-radius: 10px; background: rgba(140,115,255,.06); border: 1px solid rgba(140,115,255,.16); }
.hint { color: var(--muted); font-size: 11px; flex: 1 1 220px; align-self: center; }
.canvas-wrap { position: relative; border: 1px solid var(--line); border-radius: 11px; overflow: hidden; background: #091018; }
canvas { display: block; width: 100%; height: auto; touch-action: none; cursor: crosshair; }
.canvas-help { position: absolute; right: 9px; bottom: 8px; padding: 5px 7px; background: rgba(5,9,13,.72); color: #aab8c8; border-radius: 7px; font-size: 10px; pointer-events: none; }

.results-panel { margin-top: 16px; }
.metrics-grid { display: grid; grid-template-columns: repeat(8,minmax(120px,1fr)); gap: 10px; }
.metric { padding: 13px; background: rgba(255,255,255,.025); border: 1px solid var(--line); border-radius: 10px; min-width: 0; }
.metric span { display: block; color: var(--muted); font-size: 11px; margin-bottom: 5px; }
.metric strong { display: block; font-size: 16px; letter-spacing: -.02em; overflow-wrap: anywhere; }
.fineprint { color: var(--muted); font-size: 11px; margin: 11px 0 0; }

.pattern-panel { margin-top: 16px; }
.pattern-head { align-items: end; }
.pattern-controls { justify-content: flex-end; }
.pattern-frame { min-height: 520px; border: 1px solid var(--line); border-radius: 11px; background: #091018; overflow: hidden; }
#patternPlot { width: 100%; min-height: 520px; }
.plot-fallback { padding: 24px; color: var(--warn); }

.formulas-page { max-width: 1250px; }
.formula-intro p:last-child { color: var(--muted); margin-bottom: 0; max-width: 930px; }
.formula-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 16px; }
.formula-card { padding: 20px; min-width: 0; }
.formula-card.wide { grid-column: 1 / -1; }
.formula-card p:last-child { color: #b7c4d3; margin-bottom: 0; }
.equation { margin: 14px 0; padding: 14px 16px; border-left: 3px solid var(--accent); background: #0a1119; border-radius: 8px; overflow-x: auto; }

.footer { width: min(1500px, calc(100% - 30px)); margin: 0 auto 24px; display: flex; flex-wrap: wrap; justify-content: space-between; gap: 10px; color: #6f7d8d; font-size: 11px; }
.hidden { display: none !important; }

@media (max-width: 1180px) {
  .control-grid { grid-template-columns: repeat(4,minmax(120px,1fr)); }
  .metrics-grid { grid-template-columns: repeat(4,minmax(130px,1fr)); }
  .editors-grid { grid-template-columns: 1fr; }
}
@media (max-width: 760px) {
  .topbar { grid-template-columns: 1fr; align-items: flex-start; padding: 12px 15px; gap: 8px; }
  .brand-wrap { grid-column: 1; }
  .nav { grid-column: 1; justify-self: center; }
  .subtitle { display: none; }
  .page { width: min(100% - 18px,1500px); margin-top: 12px; }
  .control-grid { grid-template-columns: 1fr 1fr; }
  .metrics-grid { grid-template-columns: 1fr 1fr; }
  .formula-grid { grid-template-columns: 1fr; }
  .formula-card.wide { grid-column: auto; }
  .section-head, .editor-head, .pattern-head { flex-direction: column; align-items: stretch; }
  .pattern-controls { justify-content: flex-start; }
  .pattern-frame, #patternPlot { min-height: 420px; }
}
@media (max-width: 430px) {
  .brand-mark { width: 36px; height: 36px; }
  .nav a { padding: 8px 9px; }
  .control-grid, .metrics-grid { grid-template-columns: 1fr; }
  .controls-panel, .results-panel, .pattern-panel, .editor-panel, .formula-card, .formula-intro { padding: 14px; }
}

/* Main engineering workspace: aperture editors left, radiation pattern + results right. */
.workspace-grid {
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(0, 3fr);
  gap: 16px;
  margin-top: 16px;
  align-items: stretch;
}
.editors-column {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  grid-template-rows: 1fr 1fr;
  gap: 16px;
  min-width: 0;
  height: 100%;
}
.editors-column .editor-panel {
  height: 100%;
}
.right-column {
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-width: 0;
  height: 100%;
}
.workspace-grid .pattern-panel {
  margin-top: 0;
  min-width: 0;
  flex: 1 1 auto;
  display: flex;
  flex-direction: column;
}
.workspace-grid .pattern-frame {
  flex: 1 1 auto;
}
.workspace-grid .results-panel {
  margin-top: 0;
  flex: 0 0 auto;
}
.workspace-grid .metrics-grid {
  grid-template-columns: repeat(4,minmax(120px,1fr));
}
.workspace-grid .pattern-frame,
.workspace-grid #patternPlot {
  min-height: 560px;
}
.steer-row.inactive {
  opacity: .58;
}
.steer-row input:disabled {
  cursor: not-allowed;
  color: #6f7d8d;
  background: #0a1017;
}

@media (max-width: 1180px) {
  .workspace-grid { grid-template-columns: 1fr; }
  .editors-column { grid-template-rows: auto; }
  .right-column { height: auto; }
  .workspace-grid .pattern-frame,
  .workspace-grid #patternPlot { min-height: 520px; }
  .workspace-grid .metrics-grid { grid-template-columns: repeat(4,minmax(120px,1fr)); }
}

@media (max-width: 760px) {
  .workspace-grid .metrics-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 430px) {
  .workspace-grid .metrics-grid { grid-template-columns: 1fr; }
}

/* Design page */
.design-page { max-width: 1500px; }
.design-hero { padding: 22px; display:flex; align-items:center; justify-content:space-between; gap:24px; }
.design-lede { color:var(--muted); max-width:780px; margin:8px 0 0; }
.mode-switch { display:flex; padding:4px; border:1px solid var(--line); background:#0b121a; border-radius:11px; flex:0 0 auto; }
.mode-btn { min-height:40px; padding:8px 18px; border:0; border-radius:8px; background:transparent; color:var(--muted); font-weight:750; cursor:pointer; }
.mode-btn.active { background:rgba(77,179,255,.15); color:var(--text); box-shadow:inset 0 0 0 1px rgba(77,179,255,.28); }
.design-workspace { display:grid; grid-template-columns:minmax(0, 1fr) minmax(0, 1.12fr); gap:16px; margin-top:16px; align-items:start; }
.design-input-column,.design-results-column { display:flex; flex-direction:column; gap:16px; min-width:0; }
.design-card,.recommendation-card,.tradeoff-card { padding:20px; }
.design-form-grid { display:grid; grid-template-columns:repeat(3,minmax(0,1fr)); gap:12px; }
.advanced-block { margin-top:18px; padding-top:18px; border-top:1px solid var(--line); }
.advanced-title { display:flex; justify-content:space-between; gap:12px; margin-bottom:12px; }
.advanced-title span:first-child { font-weight:760; }
.advanced-title span:last-child { color:var(--muted); font-size:12px; }
.em-badge { color:var(--muted); border:1px solid var(--line); border-radius:999px; padding:6px 9px; font-size:11px; font-weight:700; }
.em-intro { margin-bottom:14px; }
.em-import { margin-top:14px; }
.drop-zone { border:1px dashed #39506a; border-radius:11px; background:rgba(77,179,255,.035); padding:15px; display:flex; justify-content:space-between; gap:14px; align-items:center; }
.drop-zone > div { min-width:0; }
.drop-zone strong { display:block; margin-bottom:4px; }
.drop-zone span { display:block; color:var(--muted); font-size:12px; }
.file-btn { position:relative; overflow:hidden; flex:0 0 auto; display:inline-flex; align-items:center; }
.file-btn input { position:absolute; inset:0; opacity:0; cursor:pointer; }
.em-actions { display:flex; gap:10px; align-items:center; flex-wrap:wrap; margin-top:10px; }
.schema-details { margin-top:10px; color:var(--muted); font-size:12px; }
.schema-details summary { cursor:pointer; color:#cbd8e7; font-weight:700; }
.schema-details code { color:#cdeaff; }
.finite-grid { display:grid; grid-template-columns:repeat(3,minmax(0,1fr)); gap:10px; margin-top:12px; }
.recommendation-hero-grid { display:grid; grid-template-columns:repeat(3,minmax(0,1fr)); gap:10px; margin-bottom:14px; }
.hero-metric { padding:15px; border:1px solid var(--line); border-radius:11px; background:rgba(255,255,255,.025); }
.hero-metric span,.hero-metric small { display:block; color:var(--muted); font-size:11px; }
.hero-metric strong { display:block; font-size:21px; letter-spacing:-.025em; margin:5px 0 2px; overflow-wrap:anywhere; }
.design-grade { padding:7px 10px; border-radius:999px; background:rgba(97,214,163,.1); color:var(--good); border:1px solid rgba(97,214,163,.22); font-size:12px; font-weight:800; }
.design-grade.warn { color:var(--warn); background:rgba(255,206,110,.08); border-color:rgba(255,206,110,.22); }
.result-table-wrap { border:1px solid var(--line); border-radius:11px; overflow:hidden; }
.result-table { width:100%; border-collapse:collapse; font-size:13px; }
.result-table th,.result-table td { padding:11px 13px; border-bottom:1px solid var(--line); vertical-align:top; }
.result-table tr:last-child th,.result-table tr:last-child td { border-bottom:0; }
.result-table th { width:48%; text-align:left; color:var(--muted); font-weight:650; background:rgba(255,255,255,.018); }
.result-table td { font-weight:700; }
.ok-text { color:var(--good); }.bad-text { color:var(--danger); }
.design-warnings { display:grid; gap:8px; margin-top:12px; }
.warning-item,.success-item { padding:10px 12px; border-radius:9px; font-size:12px; }
.warning-item { border:1px solid rgba(255,206,110,.22); color:#ffe3a5; background:rgba(255,206,110,.06); }
.success-item { border:1px solid rgba(97,214,163,.2); color:#b8f0d8; background:rgba(97,214,163,.055); }
.recommendation-actions { display:flex; flex-wrap:wrap; gap:10px; margin-top:14px; }
.primary-large { min-height:46px; padding-inline:18px; }
.logic-list { display:grid; gap:10px; }
.logic-item { display:grid; grid-template-columns:28px minmax(0,1fr); gap:10px; align-items:start; }
.logic-item > span { width:28px; height:28px; display:grid; place-items:center; border-radius:50%; color:#dff2ff; background:rgba(77,179,255,.13); border:1px solid rgba(77,179,255,.25); font-size:11px; font-weight:800; }
.logic-item p { margin:3px 0 0; color:#b7c4d3; font-size:13px; }
@media (max-width:1180px){.design-workspace{grid-template-columns:1fr}.design-form-grid{grid-template-columns:repeat(3,minmax(0,1fr));}}
@media (max-width:760px){.design-hero{flex-direction:column;align-items:stretch}.mode-switch{align-self:flex-start}.design-form-grid,.finite-grid{grid-template-columns:1fr 1fr}.recommendation-hero-grid{grid-template-columns:1fr}.drop-zone{align-items:flex-start;flex-direction:column}.result-table th{width:45%}}
@media (max-width:430px){.design-form-grid,.finite-grid{grid-template-columns:1fr}.design-card,.recommendation-card,.tradeoff-card,.design-hero{padding:14px}.result-table th,.result-table td{padding:9px 10px}.result-table{font-size:12px}}