:root {
  --paper: #f3f6f1;
  --paper-deep: #e7ede6;
  --ink: #17231d;
  --muted: #607067;
  --line: #cbd5cc;
  --moss: #2f654d;
  --moss-soft: #dce9df;
  --amber: #c98724;
  --plum: #69556d;
  --rust: #a84f38;
  --white: #fbfdf9;
  --shadow: 0 24px 70px rgba(31, 52, 40, 0.12);
  font-family:
    "Avenir Next", "Segoe UI Variable", "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", sans-serif;
  color: var(--ink);
  background: var(--paper);
  font-synthesis: none;
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  background:
    linear-gradient(90deg, rgba(47, 101, 77, 0.035) 1px, transparent 1px)
      0 0 / 24px 24px,
    var(--paper);
}

body {
  margin: 0;
  min-height: 100vh;
}

button,
input {
  font: inherit;
}

button {
  border: 1px solid var(--ink);
  border-radius: 3px;
  padding: 0.78rem 1rem;
  color: var(--ink);
  background: transparent;
  cursor: pointer;
  transition:
    transform 140ms ease,
    background-color 140ms ease,
    color 140ms ease;
}

button:hover:not(:disabled) {
  transform: translateY(-1px);
  background: var(--ink);
  color: var(--white);
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.42;
}

button.primary {
  background: var(--moss);
  border-color: var(--moss);
  color: var(--white);
}

button:focus-visible,
input:focus-visible,
pre:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--amber) 72%, white);
  outline-offset: 3px;
}

input {
  width: 100%;
  border: 0;
  border-bottom: 1px solid var(--ink);
  border-radius: 0;
  padding: 0.72rem 0;
  color: var(--ink);
  background: transparent;
}

input::placeholder {
  color: #91a097;
}

.skip-link {
  position: fixed;
  left: 1rem;
  top: 1rem;
  z-index: 20;
  transform: translateY(-180%);
  padding: 0.7rem 1rem;
  background: var(--ink);
  color: white;
}

.skip-link:focus {
  transform: translateY(0);
}

.shell {
  width: min(1440px, 100%);
  margin: 0 auto;
  min-height: 100vh;
  padding: 2rem clamp(1rem, 3vw, 3.5rem) 1.25rem;
  display: flex;
  flex-direction: column;
}

.masthead {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 2rem;
  padding-bottom: 1.6rem;
  border-bottom: 1px solid var(--ink);
}

.brand-lockup {
  display: flex;
  align-items: center;
  gap: 1.2rem;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 3.15rem;
  height: 3.15rem;
  border: 1px solid var(--ink);
  border-radius: 50%;
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-weight: 800;
  letter-spacing: -0.09em;
}

.eyebrow {
  margin: 0 0 0.42rem;
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-size: 0.69rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 0;
  max-width: 18ch;
  font-size: clamp(1.55rem, 3vw, 3rem);
  line-height: 0.98;
  letter-spacing: -0.055em;
}

h2 {
  margin-bottom: 0.7rem;
  font-size: clamp(1.45rem, 2vw, 2.15rem);
  letter-spacing: -0.035em;
}

h3 {
  letter-spacing: -0.025em;
}

.boundary {
  min-width: 11rem;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.22rem 0.52rem;
  align-items: center;
  font-size: 0.76rem;
}

.boundary strong {
  grid-column: 2;
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-weight: 500;
  color: var(--muted);
}

.boundary-dot {
  width: 0.65rem;
  height: 0.65rem;
  border-radius: 50%;
  background: var(--moss);
  box-shadow: 0 0 0 5px var(--moss-soft);
}

.workspace {
  flex: 1;
  display: grid;
  grid-template-columns: minmax(18rem, 0.82fr) minmax(28rem, 1.4fr);
  min-height: 680px;
  border-bottom: 1px solid var(--ink);
}

.control-deck,
.evidence-panel {
  padding: clamp(1.5rem, 3vw, 3.25rem);
}

.control-deck {
  border-right: 1px solid var(--ink);
  background: rgba(251, 253, 249, 0.72);
}

.section-heading > p:last-child {
  max-width: 44ch;
  line-height: 1.7;
  color: var(--muted);
}

.session-gate {
  margin: 2.5rem 0 2rem;
  padding: 1.1rem;
  border-left: 3px solid var(--plum);
  background: color-mix(in srgb, var(--plum) 8%, var(--white));
}

.inline-control {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 0.8rem;
}

.field-note {
  margin: 0.75rem 0 0;
  font-size: 0.78rem;
  line-height: 1.55;
  color: var(--muted);
}

.target-form {
  display: grid;
  gap: 0.45rem;
}

.target-form label,
.session-gate label {
  margin-top: 0.9rem;
  font-size: 0.78rem;
  font-weight: 750;
  letter-spacing: 0.025em;
}

.actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.65rem;
  margin-top: 1.7rem;
}

.trust-note {
  margin-top: 2.4rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
}

.trust-note span {
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--plum);
}

.trust-note p {
  margin: 0.45rem 0 0;
  font-size: 0.8rem;
  line-height: 1.55;
  color: var(--muted);
}

.evidence-panel {
  position: relative;
  background: var(--paper-deep);
}

.evidence-header,
.output-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
}

.status-chip {
  border: 1px solid currentColor;
  border-radius: 999px;
  padding: 0.35rem 0.64rem;
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-size: 0.68rem;
  color: var(--muted);
}

.status-chip[data-tone="running"] {
  color: var(--amber);
}

.status-chip[data-tone="success"] {
  color: var(--moss);
}

.status-chip[data-tone="failed"] {
  color: var(--rust);
}

.empty-state {
  min-height: 450px;
  display: grid;
  place-content: center;
  justify-items: center;
  text-align: center;
}

.empty-state p {
  max-width: 38ch;
  line-height: 1.65;
  color: var(--muted);
}

.empty-glyph {
  width: 12rem;
  height: 7rem;
  margin-bottom: 2rem;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  gap: 1.3rem;
  border-bottom: 1px solid var(--ink);
}

.empty-glyph span {
  width: 1px;
  background: var(--ink);
  transform-origin: bottom;
  animation: signal 2.4s ease-in-out infinite;
}

.empty-glyph span:nth-child(1) {
  height: 35%;
}

.empty-glyph span:nth-child(2) {
  height: 82%;
  animation-delay: 180ms;
}

.empty-glyph span:nth-child(3) {
  height: 54%;
  animation-delay: 360ms;
}

@keyframes signal {
  0%,
  100% {
    transform: scaleY(0.55);
    opacity: 0.42;
  }
  45% {
    transform: scaleY(1);
    opacity: 1;
  }
}

.trace-rail {
  list-style: none;
  margin: 2.2rem 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
}

.trace-rail li {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.75rem;
  min-height: 5rem;
}

.trace-rail li:not(:last-child)::after {
  content: "";
  position: absolute;
  top: 0.42rem;
  left: 0.45rem;
  right: -0.45rem;
  height: 1px;
  background: var(--moss);
}

.trace-node {
  position: relative;
  z-index: 1;
  width: 0.9rem;
  height: 0.9rem;
  border: 3px solid var(--paper-deep);
  border-radius: 50%;
  background: var(--moss);
  box-shadow: 0 0 0 1px var(--moss);
}

.trace-rail small,
.fact-grid dt,
.output-meta dt {
  display: block;
  margin-bottom: 0.42rem;
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-size: 0.65rem;
  letter-spacing: 0.11em;
  color: var(--muted);
}

.trace-rail strong {
  font-size: 0.9rem;
  overflow-wrap: anywhere;
}

.fact-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 0;
  border-top: 1px solid var(--ink);
  border-left: 1px solid var(--ink);
}

.fact-grid div {
  min-height: 6.4rem;
  padding: 1rem;
  border-right: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
}

.fact-grid dd,
.output-meta dd {
  margin: 0;
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-size: 0.82rem;
  overflow-wrap: anywhere;
}

.output-panel {
  margin-top: 2rem;
  padding: 1.2rem;
  border: 1px solid var(--plum);
  background: var(--white);
  box-shadow: var(--shadow);
}

.output-heading span {
  border: 1px solid var(--plum);
  padding: 0.3rem 0.55rem;
  font-size: 0.66rem;
  color: var(--plum);
}

.output-panel pre {
  max-height: 28rem;
  overflow: auto;
  margin: 1rem 0;
  padding: 1rem;
  border-left: 3px solid var(--plum);
  white-space: pre-wrap;
  word-break: break-word;
  font: 0.82rem/1.7 ui-monospace, "SFMono-Regular", Consolas, monospace;
  background: #f1eef2;
}

.output-meta {
  display: grid;
  grid-template-columns: 0.7fr 0.7fr 1.6fr;
  gap: 1rem;
  margin: 0;
}

.message {
  min-height: 1.4rem;
  margin-top: 1.2rem;
  font-size: 0.82rem;
  color: var(--muted);
}

.message[data-tone="error"] {
  color: var(--rust);
}

footer {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding-top: 1rem;
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-size: 0.65rem;
  color: var(--muted);
}

[hidden] {
  display: none !important;
}

@media (max-width: 860px) {
  .masthead,
  footer {
    flex-direction: column;
  }

  .workspace {
    grid-template-columns: 1fr;
  }

  .control-deck {
    border-right: 0;
    border-bottom: 1px solid var(--ink);
  }

  .trace-rail {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .trace-rail li {
    min-height: 3rem;
  }

  .trace-rail li:not(:last-child)::after {
    left: 0.42rem;
    right: auto;
    top: 0.8rem;
    bottom: -1.45rem;
    width: 1px;
    height: auto;
  }
}

@media (max-width: 520px) {
  .shell {
    padding-inline: 0.75rem;
  }

  .brand-lockup {
    align-items: flex-start;
  }

  .brand-mark {
    flex: 0 0 auto;
    width: 2.7rem;
    height: 2.7rem;
  }

  .control-deck,
  .evidence-panel {
    padding: 1.25rem;
  }

  .inline-control,
  .actions,
  .fact-grid,
  .output-meta {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}