:root {
  --ink: #201d1d;
  --ink-deep: #0f0000;
  --charcoal: #302c2c;
  --body: #424245;
  --mute: #646262;
  --ash: #9a9898;
  --canvas: #fdfcfc;
  --surface-soft: #f8f7f7;
  --surface-card: #f1eeee;
  --surface-dark: #201d1d;
  --surface-dark-elevated: #302c2c;
  --hairline: rgba(15, 0, 0, 0.12);
  --hairline-strong: #646262;
  --on-dark: #fdfcfc;
  --success: #30d158;
  --warning: #ff9f0a;
  --danger: #ff3b30;
  --accent: #007aff;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--canvas);
  color: var(--ink);
  font-family: "Berkeley Mono", "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas,
    "Liberation Mono", "Courier New", monospace;
  font-size: 16px;
  line-height: 1.5;
  letter-spacing: 0;
}

a {
  color: var(--ink);
  text-decoration: underline;
  text-underline-offset: 3px;
}

button,
input,
select {
  font: inherit;
  letter-spacing: 0;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 2;
  display: grid;
  grid-template-columns: 1fr auto auto;
  align-items: center;
  gap: 16px;
  min-height: 56px;
  padding: 8px 24px;
  background: var(--canvas);
  border-bottom: 1px solid var(--hairline);
}

.wordmark {
  font-weight: 700;
  text-decoration: none;
}

.nav-links {
  display: flex;
  gap: 16px;
  align-items: center;
}

.nav-links a[aria-current] {
  font-weight: 700;
  text-decoration-thickness: 2px;
}

.tool-page,
.content-section,
.footer {
  width: min(1100px, calc(100% - 48px));
  margin: 0 auto;
}

.tool-page {
  padding: 48px 0 0;
  scroll-margin-top: 72px;
}

.tool-page[hidden] {
  display: none;
}

.intro-block {
  max-width: 960px;
  padding-bottom: 32px;
}

.eyebrow,
.section-label,
.terminal-title {
  margin: 0 0 12px;
  font-weight: 700;
  color: var(--ink);
}

h1 {
  max-width: 920px;
  margin: 0 0 16px;
  font-size: 38px;
  line-height: 1.5;
}

h2 {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.5;
}

h3 {
  margin: 0 0 8px;
  font-size: 16px;
  line-height: 1.5;
}

p {
  max-width: 760px;
  margin: 0;
  color: var(--body);
}

.workbench {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 32px;
  align-items: stretch;
}

.input-panel,
.content-section {
  border-top: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
}

.input-panel {
  padding: 16px 0;
}

.field {
  display: grid;
  gap: 8px;
  padding: 8px 0;
  color: var(--body);
}

.field span {
  color: var(--ink);
  font-weight: 500;
}

input,
select {
  width: 100%;
  height: 40px;
  padding: 8px 12px;
  color: var(--ink);
  background: var(--surface-soft);
  border: 1px solid var(--hairline);
  border-radius: 4px;
}

input:focus,
select:focus {
  outline: none;
  background: var(--canvas);
  border-color: var(--ink);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-top: 16px;
}

.compact-actions {
  align-items: center;
  padding: 8px 0 16px;
  border-bottom: 1px solid var(--hairline);
}

.status-line {
  color: var(--mute);
  font-size: 14px;
}

.button {
  min-height: 36px;
  padding: 4px 20px;
  border-radius: 4px;
  cursor: pointer;
}

.button-primary {
  color: var(--canvas);
  background: var(--ink);
  border: 1px solid var(--ink);
}

.button-primary:active {
  background: var(--ink-deep);
}

.button-secondary {
  color: var(--ink);
  background: var(--canvas);
  border: 1px solid var(--hairline-strong);
}

.result-terminal {
  min-height: 100%;
  padding: 32px;
  color: var(--on-dark);
  background: var(--surface-dark);
}

.result-terminal .terminal-title {
  color: var(--on-dark);
}

pre {
  min-height: 310px;
  margin: 0;
  white-space: pre-wrap;
  color: var(--on-dark);
}

.terminal-row {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 8px 12px;
  background: var(--surface-dark-elevated);
  border-radius: 4px;
  color: var(--on-dark);
}

#aiRoiSignal.good,
#serverCostSignal.good,
#hiringSignal.good,
.terminal-row .good {
  color: var(--success);
}

#aiRoiSignal.warn,
#serverCostSignal.warn,
#hiringSignal.warn,
.terminal-row .warn {
  color: var(--warning);
}

#aiRoiSignal.bad,
#serverCostSignal.bad,
#hiringSignal.bad,
.terminal-row .bad {
  color: var(--danger);
}

.content-section {
  margin-top: 96px;
  padding: 16px 0;
}

.rule-row {
  display: grid;
  grid-template-columns: minmax(220px, 300px) 1fr;
  gap: 16px;
  padding: 8px 0;
  color: var(--body);
}

.rule-row strong {
  color: var(--ink);
  font-weight: 700;
}

.faq-row {
  display: grid;
  width: 100%;
  gap: 8px;
  padding: 12px 0;
  text-align: left;
  color: var(--ink);
  background: var(--canvas);
  border: 0;
  border-bottom: 1px solid var(--hairline);
  border-radius: 0;
  cursor: pointer;
}

.faq-row span:first-child {
  font-weight: 500;
}

.faq-row span:last-child {
  display: none;
  color: var(--body);
}

.faq-row[aria-expanded="true"] span:last-child {
  display: block;
}

.answer-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.answer-card {
  padding: 16px 0;
  border-top: 1px solid var(--hairline);
}

.answer-card p {
  color: var(--body);
}

.footer {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-top: 96px;
  padding: 32px 0;
  border-top: 1px solid var(--hairline);
  color: var(--mute);
  font-size: 14px;
  line-height: 2;
}

.footer a {
  color: var(--mute);
}

@media (max-width: 850px) {
  .workbench {
    grid-template-columns: 1fr;
  }

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

  .rule-row {
    grid-template-columns: 1fr;
    gap: 4px;
  }
}

@media (max-width: 640px) {
  .topbar {
    grid-template-columns: 1fr auto;
    padding: 8px 16px;
  }

  .nav-links {
    grid-column: 1 / -1;
    order: 2;
    overflow-x: auto;
    padding-bottom: 4px;
    white-space: nowrap;
  }

  .tool-page,
  .content-section,
  .footer {
    width: min(100% - 32px, 1100px);
  }

  .tool-page {
    padding-top: 32px;
  }

  h1 {
    font-size: 28px;
  }

  .result-terminal {
    padding: 24px 16px;
  }

  .content-section,
  .footer {
    margin-top: 48px;
  }

  .footer {
    display: grid;
  }
}