:root {
  --ink: #15181f;
  --muted: #667085;
  --paper: #f6f3ea;
  --panel: #fffdf7;
  --line: #22262f;
  --blue: #1f5eff;
  --green: #6cbd45;
  --orange: #f06b2f;
  --violet: #7c4dff;
  --shadow: 0 18px 50px rgba(31, 35, 45, 0.13);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    linear-gradient(rgba(21, 24, 31, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(21, 24, 31, 0.05) 1px, transparent 1px),
    var(--paper);
  background-size: 22px 22px;
  font-family: "Songti SC", "Noto Serif CJK SC", "Source Han Serif SC", ui-serif, Georgia, serif;
}

button,
textarea,
a {
  font: inherit;
}

.shell {
  width: min(1480px, calc(100vw - 32px));
  min-height: calc(100vh - 32px);
  margin: 16px auto;
  display: grid;
  grid-template-columns: 300px minmax(420px, 1fr) 380px;
  gap: 16px;
}

.rail,
.console,
.trace {
  min-width: 0;
}

.brand,
.panel,
.console {
  background: rgba(255, 253, 247, 0.94);
  border: 2px solid var(--line);
  box-shadow: var(--shadow);
}

.brand {
  min-height: 104px;
  padding: 18px;
  display: flex;
  align-items: center;
  gap: 14px;
}

.mark {
  width: 54px;
  height: 54px;
  display: grid;
  place-items: center;
  color: #fff;
  background: var(--line);
  font-weight: 800;
  letter-spacing: 0.04em;
}

.eyebrow {
  margin: 0 0 6px;
  color: var(--muted);
  font: 700 11px ui-monospace, SFMono-Regular, Menlo, monospace;
  letter-spacing: 0.08em;
}

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

h1 {
  margin-bottom: 0;
  font-size: 30px;
  line-height: 0.95;
}

h2 {
  margin-bottom: 14px;
  font-size: 24px;
  line-height: 1.05;
}

h3 {
  margin-bottom: 10px;
  font: 800 12px ui-monospace, SFMono-Regular, Menlo, monospace;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.rail,
.trace {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.panel {
  padding: 18px;
}

.capability-list {
  display: grid;
  gap: 10px;
}

.capability {
  padding: 13px;
  border: 1.5px solid var(--line);
  background: #fff;
}

.capability strong {
  display: block;
  margin-bottom: 6px;
  font-size: 17px;
}

.capability p {
  margin-bottom: 10px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.35;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tag {
  padding: 4px 7px;
  border: 1px solid rgba(21, 24, 31, 0.25);
  background: #f6f8ff;
  font: 700 11px ui-monospace, SFMono-Regular, Menlo, monospace;
}

.stats dl {
  margin: 0;
  display: grid;
  gap: 11px;
}

.stats div {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  border-bottom: 1px solid rgba(21, 24, 31, 0.16);
  padding-bottom: 9px;
}

dt {
  font-weight: 800;
}

dd {
  margin: 0;
  color: var(--muted);
  text-align: right;
}

.console {
  display: flex;
  flex-direction: column;
  min-height: calc(100vh - 32px);
}

.console-header {
  padding: 22px 24px 16px;
  display: flex;
  justify-content: space-between;
  gap: 24px;
  border-bottom: 2px solid var(--line);
}

.console-header h2 {
  margin: 0;
  font-size: clamp(34px, 5vw, 74px);
  letter-spacing: -0.03em;
}

.repo-link {
  align-self: start;
  color: var(--line);
  text-decoration: none;
  border: 2px solid var(--line);
  padding: 8px 12px;
  background: var(--green);
  font-weight: 800;
}

.prompt-strip {
  padding: 14px 18px;
  display: flex;
  gap: 10px;
  overflow-x: auto;
  border-bottom: 1.5px solid rgba(21, 24, 31, 0.25);
}

.prompt-strip button {
  white-space: nowrap;
  border: 1.5px solid var(--line);
  background: #fff;
  padding: 8px 10px;
  cursor: pointer;
}

.prompt-strip button:hover {
  background: var(--blue);
  color: #fff;
}

.chat-log {
  flex: 1;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  overflow-y: auto;
}

.message {
  max-width: 820px;
  padding: 16px 18px;
  border: 1.5px solid var(--line);
  background: #fff;
  line-height: 1.6;
}

.user-message {
  align-self: flex-end;
  background: #eef6ff;
}

.agent-message {
  align-self: flex-start;
  background: #fffdf7;
}

.message-label {
  display: block;
  margin-bottom: 8px;
  color: var(--orange);
  font: 800 12px ui-monospace, SFMono-Regular, Menlo, monospace;
}

.message p {
  margin-bottom: 0;
  white-space: pre-wrap;
}

.composer {
  display: grid;
  grid-template-columns: 1fr 112px;
  gap: 12px;
  padding: 16px;
  border-top: 2px solid var(--line);
  background: #f8fafc;
}

textarea {
  width: 100%;
  resize: none;
  border: 2px solid var(--line);
  padding: 14px;
  background: #fff;
  color: var(--ink);
  outline: none;
  line-height: 1.45;
}

textarea:focus {
  border-color: var(--blue);
}

.composer button {
  border: 2px solid var(--line);
  background: var(--orange);
  color: #111;
  font-weight: 900;
  cursor: pointer;
}

.composer button:disabled {
  cursor: wait;
  opacity: 0.7;
}

.trace-panel {
  flex: 1;
}

.trace-title {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  padding-bottom: 14px;
  border-bottom: 2px solid var(--line);
}

.trace-title h2 {
  margin: 0;
}

.confidence {
  min-width: 62px;
  height: 42px;
  display: grid;
  place-items: center;
  background: var(--violet);
  color: #fff;
  font: 900 16px ui-monospace, SFMono-Regular, Menlo, monospace;
}

.trace-grid {
  display: grid;
  gap: 18px;
  margin-top: 18px;
}

ul,
ol {
  margin: 0;
  padding-left: 20px;
}

li {
  margin: 7px 0;
  line-height: 1.35;
}

.citations {
  display: grid;
  gap: 10px;
}

blockquote {
  margin: 0;
  padding: 10px 12px;
  border-left: 5px solid var(--green);
  background: #f4f8ef;
  color: #3f4b39;
  line-height: 1.45;
}

.architecture img {
  display: block;
  width: 100%;
  border: 1.5px solid rgba(21, 24, 31, 0.28);
  background: #fff;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 1120px) {
  .shell {
    grid-template-columns: 280px 1fr;
  }

  .trace {
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 760px) {
  .shell {
    width: min(100vw - 16px, 640px);
    grid-template-columns: 1fr;
    margin: 8px auto;
  }

  .console {
    order: -2;
  }

  .rail {
    order: -1;
  }

  .console {
    min-height: 720px;
  }

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

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

  .composer button {
    min-height: 48px;
  }
}