:root {
  --bg: #f7fafc;
  --panel: #ffffff;
  --ink: #0f172a;
  --muted: #607086;
  --line: #d9e2ee;
  --soft: #eef5fb;
  --blue: #2563eb;
  --green: #0f9f6e;
  --shadow: 0 24px 70px rgba(15, 23, 42, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: linear-gradient(180deg, #f7fafc 0%, #eef5fb 100%);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  letter-spacing: 0;
}

button,
select,
textarea {
  font: inherit;
}

.app-shell {
  width: min(1220px, calc(100% - 32px));
  margin: 0 auto;
  padding: 34px 0 58px;
}

.hero {
  padding: 34px;
  margin-bottom: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.9);
  box-shadow: var(--shadow);
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--blue);
  font-size: 13px;
  font-weight: 820;
  text-transform: uppercase;
}

h1,
p {
  margin-top: 0;
}

h1 {
  max-width: 860px;
  margin-bottom: 16px;
  font-size: clamp(40px, 6vw, 78px);
  line-height: 0.96;
}

.hero-copy {
  max-width: 780px;
  margin-bottom: 0;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.58;
}

.builder-grid {
  display: grid;
  grid-template-columns: minmax(280px, 350px) 1fr;
  gap: 18px;
}

.control-panel,
.work-panel {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.control-panel {
  display: grid;
  gap: 18px;
  align-self: start;
  padding: 20px;
}

.work-panel {
  display: grid;
  gap: 16px;
  padding: 20px;
}

.field,
.task-input {
  display: grid;
  gap: 8px;
}

.field span,
.task-input span,
.output-heading span,
legend {
  color: var(--ink);
  font-size: 13px;
  font-weight: 820;
  text-transform: uppercase;
}

select,
textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  outline: none;
}

select {
  min-height: 44px;
  padding: 0 12px;
}

textarea {
  min-height: 206px;
  resize: vertical;
  padding: 16px;
  line-height: 1.55;
}

select:focus,
textarea:focus {
  border-color: rgba(37, 99, 235, 0.8);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}

.checkbox-group {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--soft);
}

.checkbox-group label {
  display: grid;
  grid-template-columns: 18px 1fr;
  gap: 10px;
  align-items: start;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.35;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

button {
  min-height: 44px;
  border: 0;
  border-radius: 8px;
  padding: 0 18px;
  background: var(--ink);
  color: #fff;
  cursor: pointer;
  font-weight: 780;
}

button.secondary {
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
}

.brief-output {
  overflow: hidden;
  border: 1px solid rgba(37, 99, 235, 0.24);
  border-radius: 8px;
  background: #f8fbff;
}

.output-heading {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  padding: 14px 16px;
  border-bottom: 1px solid rgba(37, 99, 235, 0.18);
}

.output-heading small {
  color: var(--green);
  font-weight: 760;
}

pre {
  overflow: auto;
  max-height: 570px;
  margin: 0;
  padding: 18px;
  color: #1f2937;
  font: 14px/1.62 ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  white-space: pre-wrap;
}

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

@media (max-width: 560px) {
  .app-shell {
    width: min(100% - 20px, 1220px);
    padding-top: 12px;
  }

  .hero,
  .control-panel,
  .work-panel {
    padding: 16px;
  }

  h1 {
    font-size: 40px;
  }

  .output-heading {
    align-items: flex-start;
    flex-direction: column;
  }
}