:root {
  color-scheme: light;
  --navy-950: #081523;
  --navy-900: #10243d;
  --navy-800: #173552;
  --navy-700: #24506f;
  --cyan-500: #28b8b1;
  --cyan-300: #66d7d1;
  --amber-500: #f4b942;
  --red-500: #d95c59;
  --green-500: #2f9c73;
  --ink: #172033;
  --muted: #637083;
  --line: #d8e0e8;
  --surface: #ffffff;
  --surface-2: #f4f7fa;
  --surface-3: #eaf0f5;
  --shadow: 0 12px 35px rgba(16, 36, 61, 0.12);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-synthesis: none;
}

* { box-sizing: border-box; }
body { margin: 0; background: #eef3f7; color: var(--ink); min-width: 320px; }
button, input, select, textarea { font: inherit; }
button { border: 1px solid var(--line); background: var(--surface); color: var(--ink); border-radius: 8px; padding: 0.58rem 0.75rem; cursor: pointer; font-weight: 650; transition: 150ms ease; }
button:hover:not(:disabled) { border-color: var(--cyan-500); transform: translateY(-1px); }
button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible, [tabindex="0"]:focus-visible { outline: 3px solid rgba(40, 184, 177, 0.3); outline-offset: 2px; }
button:disabled { opacity: 0.45; cursor: not-allowed; }
button.primary { background: var(--cyan-500); border-color: var(--cyan-500); color: #062c2a; }
button.secondary { background: var(--navy-900); color: #fff; border-color: var(--navy-900); }
button.danger { background: #fff1f0; color: #8f2826; border-color: #efb4b2; }
button.danger-text { color: #a63d39; }
input, select, textarea { width: 100%; border: 1px solid var(--line); background: #fff; border-radius: 7px; padding: 0.55rem 0.65rem; color: var(--ink); }
textarea { resize: vertical; }
label { display: grid; gap: 0.32rem; color: var(--muted); font-size: 0.82rem; font-weight: 700; }
h1, h2, h3, p { margin-top: 0; }
h1 { font-size: 1.45rem; margin-bottom: 0; }
h2 { font-size: 1.12rem; margin-bottom: 0.8rem; }
h3 { font-size: 0.9rem; }
.eyebrow { display: block; color: var(--cyan-500); font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.12em; font-weight: 800; margin-bottom: 0.2rem; }
.muted { color: var(--muted); font-size: 0.82rem; }

.topbar { min-height: 74px; display: grid; grid-template-columns: auto minmax(250px, 1fr) auto; gap: 1rem; align-items: center; padding: 0.75rem 1.2rem; background: var(--navy-950); color: #fff; }
.brand-block { display: flex; align-items: center; gap: 0.75rem; min-width: 230px; }
.brand-block strong, .brand-block span { display: block; }
.brand-block strong { font-size: 1.05rem; }
.brand-block span { color: #adc3d5; font-size: 0.74rem; }
.brand-mark { width: 44px; height: 44px; border-radius: 12px; display: grid; place-items: center; color: var(--navy-950); background: linear-gradient(135deg, var(--cyan-300), var(--amber-500)); font-weight: 900; }
.project-name-field { color: #b8cad8; }
.project-name-field input { background: rgba(255,255,255,0.08); border-color: rgba(255,255,255,0.18); color: #fff; font-weight: 750; }
.topbar-actions { display: flex; gap: 0.45rem; flex-wrap: wrap; justify-content: flex-end; }
.topbar-actions button { color: #fff; background: rgba(255,255,255,0.08); border-color: rgba(255,255,255,0.15); }

.project-bar, .simulation-bar { display: flex; gap: 0.65rem; align-items: end; padding: 0.7rem 1.2rem; background: var(--surface); border-bottom: 1px solid var(--line); flex-wrap: wrap; }
.project-bar label { min-width: 155px; }
.project-bar button { margin-bottom: 1px; }
.simulation-bar { background: var(--navy-900); color: #fff; align-items: center; }
.simulation-bar label { color: #bcd0df; grid-template-columns: auto minmax(90px, 120px) auto; align-items: center; }
.simulation-controls { display: flex; gap: 0.45rem; flex-wrap: wrap; }
.simulation-bar button { background: var(--navy-800); border-color: #315878; color: #fff; }
.simulation-bar button.primary { background: var(--cyan-300); border-color: var(--cyan-300); color: var(--navy-950); }
.status-pill { margin-left: auto; display: inline-flex; gap: 0.45rem; align-items: center; padding: 0.42rem 0.65rem; border: 1px solid #45657f; border-radius: 999px; font-size: 0.82rem; }
.status-pill span { width: 9px; height: 9px; border-radius: 50%; background: #8ea3b4; }
.status-pill.running span { background: var(--cyan-300); box-shadow: 0 0 0 5px rgba(102,215,209,0.16); }
.status-pill.paused span { background: var(--amber-500); }
.runtime-readout { color: #bad0df; font-variant-numeric: tabular-nums; font-size: 0.82rem; }
.notice { margin: 0.85rem 1.2rem 0; background: #e1f7f5; border: 1px solid #9fe3df; color: #155e59; border-radius: 9px; padding: 0.75rem 0.9rem; font-weight: 700; }

main { padding: 1rem 1.2rem 1.5rem; }
.panel, .network-card { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; box-shadow: 0 3px 12px rgba(16,36,61,0.05); }
.workspace-grid { display: grid; grid-template-columns: 220px minmax(540px, 1fr) 285px; gap: 0.9rem; align-items: start; }
.instruction-library, .properties-panel { position: sticky; top: 0.7rem; padding: 1rem; max-height: calc(100vh - 1.4rem); overflow: auto; }
.palette-group { display: grid; gap: 0.38rem; margin: 1rem 0; }
.palette-group h3 { color: var(--navy-700); margin: 0.25rem 0; }
.palette-group button { text-align: left; }
.compatibility-note { padding: 0.75rem; border-radius: 9px; background: var(--surface-2); border-left: 4px solid var(--cyan-500); display: grid; gap: 0.3rem; font-size: 0.75rem; }
.compatibility-note span { color: var(--muted); line-height: 1.45; }

.ladder-editor { min-width: 0; }
.section-heading, .panel-heading, .network-heading { display: flex; justify-content: space-between; gap: 1rem; align-items: center; }
.section-heading { margin-bottom: 0.8rem; }
.network-card { overflow: hidden; margin-bottom: 0.85rem; }
.network-card.selected { border-color: var(--cyan-500); box-shadow: 0 0 0 2px rgba(40,184,177,0.11), var(--shadow); }
.network-heading { padding: 0.8rem 0.95rem; background: var(--surface-2); border-bottom: 1px solid var(--line); }
.network-heading h3 { margin: 0.15rem 0 0; font-size: 0.98rem; }
.network-number { color: var(--cyan-500); text-transform: uppercase; font-size: 0.68rem; letter-spacing: 0.1em; font-weight: 900; }
.inline-actions { display: flex; gap: 0.35rem; }
.inline-actions button { padding: 0.38rem 0.55rem; font-size: 0.75rem; }
.network-footer { padding: 0.65rem 0.95rem; border-top: 1px solid var(--line); display: flex; justify-content: space-between; gap: 1rem; align-items: center; }
.network-footer p { margin: 0; color: var(--muted); font-size: 0.78rem; }
.branch-selector { display: flex; gap: 0.35rem; flex-wrap: wrap; }
.branch-chip { padding: 0.32rem 0.55rem; font-size: 0.72rem; }
.branch-chip.active { background: var(--navy-900); color: #fff; border-color: var(--navy-900); }
.ladder-scroll { overflow-x: auto; background: linear-gradient(#fff, #fbfdfe); }
.ladder-svg { display: block; width: 100%; height: auto; max-height: 420px; }
.ladder-svg line, .ladder-svg path, .ladder-svg rect { stroke: #34495d; stroke-width: 3; fill: none; vector-effect: non-scaling-stroke; }
.ladder-svg .rail { stroke: var(--navy-900); stroke-width: 5; }
.ladder-svg .wire.energized, .ladder-svg .ladder-element.energized line, .ladder-svg .ladder-element.energized path, .ladder-svg .ladder-element.energized rect:not(.selection-box) { stroke: var(--cyan-500); filter: drop-shadow(0 0 3px rgba(40,184,177,.45)); }
.ladder-svg .selection-box { stroke: transparent; fill: transparent; }
.ladder-svg .ladder-element { cursor: pointer; }
.ladder-svg .ladder-element.selected .selection-box { stroke: var(--amber-500); fill: rgba(244,185,66,0.08); stroke-width: 2; }
.ladder-svg text { fill: var(--ink); font-size: 13px; font-weight: 700; }
.ladder-svg .ladder-address { font-size: 14px; }
.ladder-svg .ladder-symbol { font-size: 16px; }
.ladder-svg .ladder-caption { font-size: 10px; fill: var(--muted); }
.ladder-output.invalid rect { stroke: var(--red-500); stroke-dasharray: 6 4; }
.ladder-output.invalid text { fill: var(--red-500); }

.properties-panel h2 { margin-bottom: 1rem; }
.property-form { display: grid; gap: 0.8rem; }
.property-type { display: inline-flex; width: fit-content; background: var(--navy-900); color: #fff; border-radius: 999px; padding: 0.3rem 0.55rem; font-size: 0.7rem; font-weight: 800; }
.property-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 0.45rem; }
.property-actions .danger { grid-column: 1 / -1; }

.lower-grid { display: grid; grid-template-columns: minmax(420px, 0.9fr) minmax(520px, 1.1fr); gap: 0.9rem; margin-top: 0.9rem; align-items: stretch; }
.scenario-panel, .monitor-panel, .diagnostics-panel, .evaluation-panel { padding: 1rem; }
.scenario-problem { color: var(--muted); line-height: 1.5; }
.scenario-layout { display: grid; grid-template-columns: minmax(280px, 1.1fr) minmax(220px, 0.9fr); gap: 1rem; align-items: center; }
.scenario-visual { min-height: 280px; background: radial-gradient(circle at 50% 25%, #fff, #e8f0f5); border: 1px solid var(--line); border-radius: 10px; display: grid; place-items: center; padding: 0.6rem; }
.scenario-visual svg { width: min(100%, 420px); max-height: 300px; }
.scenario-visual text { fill: var(--ink); font-weight: 700; font-size: 12px; }
.scene-wall { fill: #cbd7df; stroke: #879aa8; stroke-width: 3; }
.scene-opening { fill: #203b52; }
.scene-door { fill: #87c8c4; stroke: #24506f; stroke-width: 3; }
.scene-detail { stroke: #24506f; stroke-width: 2; }
.scene-sensor { fill: #70879a; }
.scene-sensor.active { fill: var(--red-500); filter: drop-shadow(0 0 6px rgba(217,92,89,.7)); }
.traffic-body { fill: #24384d; stroke: #0a1724; stroke-width: 5; }
.traffic-post { fill: #506579; }
.traffic-lamp { stroke: #0d1822; stroke-width: 5; opacity: 0.22; }
.traffic-lamp.red { fill: #e4514e; }
.traffic-lamp.yellow { fill: #f5c54b; }
.traffic-lamp.green { fill: #43b780; }
.traffic-lamp.active { opacity: 1; filter: drop-shadow(0 0 12px currentColor); }
.scenario-inputs { display: grid; gap: 0.45rem; }
.switch-row { grid-template-columns: auto 1fr; align-items: center; gap: 0.55rem; padding: 0.52rem 0.6rem; border: 1px solid var(--line); border-radius: 8px; color: var(--ink); background: #fff; }
.switch-row input { width: 1.1rem; height: 1.1rem; }
.event-list p { padding: 0.5rem; background: #fff2e5; border-radius: 7px; color: #7b4a16; font-size: 0.8rem; }

.monitor-grid { display: grid; grid-template-columns: repeat(2, minmax(210px, 1fr)); gap: 0.9rem; }
.monitor-grid > div { background: var(--surface-2); padding: 0.7rem; border-radius: 9px; }
.bit-grid { display: grid; grid-template-columns: repeat(4, minmax(48px, 1fr)); gap: 0.35rem; }
.memory-bit { display: flex; justify-content: space-between; gap: 0.35rem; border: 1px solid var(--line); background: #fff; padding: 0.35rem 0.4rem; border-radius: 6px; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 0.72rem; }
.memory-bit.active { background: #dff8f5; border-color: var(--cyan-500); color: #0b625d; }
.function-list { display: grid; gap: 0.35rem; }
.function-row { display: grid; grid-template-columns: 50px 1fr auto; gap: 0.45rem; align-items: center; padding: 0.4rem 0.5rem; border-radius: 6px; background: #fff; border: 1px solid var(--line); font-size: 0.72rem; }
.function-row.active { border-color: var(--cyan-500); background: #dff8f5; }

.diagnostics-panel, .evaluation-panel { margin-top: 0.9rem; }
.diagnostics-panel ul { list-style: none; padding: 0; margin: 0.8rem 0 0; display: grid; gap: 0.4rem; }
.diagnostics-panel li { display: grid; grid-template-columns: 90px 1fr; gap: 0.75rem; padding: 0.58rem 0.7rem; border-radius: 7px; font-size: 0.82rem; }
.diagnostics-panel li.error { background: #fff0ef; color: #822b28; }
.diagnostics-panel li.warning { background: #fff6df; color: #785513; }
.diagnostics-panel li.info, .diagnostics-panel li.success { background: #e6f8f5; color: #145f59; }
.evaluation-panel { overflow-x: auto; }
.evaluation-panel table { width: 100%; border-collapse: collapse; margin-top: 0.8rem; font-size: 0.82rem; }
.evaluation-panel th, .evaluation-panel td { padding: 0.6rem; border-bottom: 1px solid var(--line); text-align: left; }
.score { font-size: 1.6rem; font-weight: 900; color: var(--cyan-500); }
.evaluation-footer { display: flex; justify-content: space-between; align-items: center; gap: 1rem; margin-top: 0.75rem; color: var(--muted); font-size: 0.8rem; }
.legal-footer { background: var(--navy-950); color: #c5d5e2; padding: 1rem 1.2rem; font-size: 0.78rem; line-height: 1.55; }
.legal-footer strong { color: #fff; }

@media (max-width: 1250px) {
  .workspace-grid { grid-template-columns: 190px minmax(520px, 1fr); }
  .properties-panel { position: static; grid-column: 1 / -1; max-height: none; }
  .property-form { grid-template-columns: repeat(2, minmax(220px, 1fr)); }
  .property-type, .property-actions, .property-form > button, .property-form > p { grid-column: 1 / -1; }
  .lower-grid { grid-template-columns: 1fr; }
}

@media (max-width: 860px) {
  .topbar { grid-template-columns: 1fr; }
  .topbar-actions { justify-content: flex-start; }
  .workspace-grid { grid-template-columns: 1fr; }
  .instruction-library { position: static; max-height: none; }
  .palette-group { grid-template-columns: repeat(2, minmax(130px, 1fr)); }
  .palette-group h3 { grid-column: 1 / -1; }
  .scenario-layout, .monitor-grid { grid-template-columns: 1fr; }
  .status-pill { margin-left: 0; }
}

.mode-note {
  margin: 0.75rem 0 1rem;
  padding: 0.75rem 0.9rem;
  border-left: 4px solid var(--cyan-500);
  background: color-mix(in srgb, var(--cyan-500) 8%, white);
  border-radius: 0 8px 8px 0;
}

.scenario-content-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.7rem;
  margin-top: 1rem;
}

.scenario-content-grid details {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.65rem 0.75rem;
  background: var(--surface-2);
}

.scenario-content-grid summary {
  cursor: pointer;
  font-weight: 700;
}

.scenario-content-grid details[open] summary {
  margin-bottom: 0.6rem;
}

.compact-list {
  margin: 0.35rem 0 0.65rem;
  padding-left: 1.2rem;
}

.compact-list li + li {
  margin-top: 0.3rem;
}

.hint {
  margin-top: 0.45rem;
  background: white !important;
}

.table-scroll {
  overflow-x: auto;
}

.io-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.io-table th,
.io-table td {
  border-bottom: 1px solid var(--line);
  padding: 0.45rem;
  text-align: left;
  vertical-align: top;
}

@media (max-width: 900px) {
  .scenario-content-grid {
    grid-template-columns: 1fr;
  }
}