:root {
  --dev-ink: #0f172a;
  --dev-muted: #64748b;
  --dev-line: rgba(15, 23, 42, 0.12);
  --dev-card: rgba(255, 255, 255, 0.9);
  --dev-blue: #2563eb;
  --dev-purple: #7c3aed;
  --dev-green: #16a34a;
  --dev-shadow: 0 24px 70px rgba(37, 99, 235, 0.12);
}

body.developer-utility-page {
  min-height: 100vh;
  font-family: Inter, "Noto Sans KR", system-ui, sans-serif;
  color: var(--dev-ink);
  background:
    radial-gradient(circle at 5% 10%, rgba(6, 182, 212, 0.14), transparent 24rem),
    radial-gradient(circle at 92% 8%, rgba(124, 58, 237, 0.16), transparent 28rem),
    linear-gradient(180deg, #f8fbff 0%, #ffffff 50%, #f8f7ff 100%);
}

.dev-main {
  width: min(1180px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 1.35rem 0 4rem;
}

.dev-breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--dev-muted);
  font-size: 0.9rem;
  font-weight: 800;
}

.dev-breadcrumb a {
  color: inherit;
  text-decoration: none;
}

.dev-hero {
  text-align: center;
  padding: 2.2rem 1rem 2.4rem;
}

.dev-flow-icon {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.05rem;
  color: var(--dev-blue);
}

.dev-flow-icon span {
  display: grid;
  place-items: center;
  width: 3rem;
  height: 3rem;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.88);
  box-shadow: 0 14px 32px rgba(37, 99, 235, 0.12);
}

.dev-hero h1 {
  margin: 0;
  font-size: clamp(2.2rem, 5.5vw, 4.2rem);
  line-height: 1;
  font-weight: 900;
  letter-spacing: 0;
}

.dev-hero h1 span {
  color: var(--dev-blue);
}

.dev-hero p {
  max-width: 760px;
  margin: 1rem auto 0;
  color: #475569;
  font-size: 1.05rem;
  line-height: 1.65;
}

.dev-benefits {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.dev-benefits span {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.5rem 0.8rem;
  border: 1px solid rgba(37, 99, 235, 0.1);
  border-radius: 999px;
  color: #31559d;
  background: rgba(255, 255, 255, 0.72);
  font-weight: 850;
  font-size: 0.86rem;
}

.dev-workspace {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 1.25rem;
}

.dev-panel,
.dev-info-grid article,
.dev-guide-panel {
  border: 1px solid var(--dev-line);
  border-radius: 22px;
  background: var(--dev-card);
  box-shadow: var(--dev-shadow);
}

.dev-panel {
  min-width: 0;
  padding: 1.2rem;
}

.dev-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

.dev-toolbar p {
  margin: 0 0 0.25rem;
  color: var(--dev-blue);
  font-size: 0.78rem;
  font-weight: 900;
  text-transform: uppercase;
}

.dev-toolbar h2 {
  margin: 0;
  font-size: 1.1rem;
}

.dev-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: flex-end;
}

.dev-actions button,
.dev-file-button,
.dev-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  min-height: 2.55rem;
  border: 1px solid var(--dev-line);
  border-radius: 11px;
  padding: 0.58rem 0.82rem;
  color: #334155;
  background: white;
  font: inherit;
  font-weight: 850;
  cursor: pointer;
}

.dev-primary {
  width: 100%;
  margin-top: 1rem;
  border: 0;
  color: white;
  background: linear-gradient(135deg, var(--dev-blue), var(--dev-purple));
  box-shadow: 0 18px 38px rgba(37, 99, 235, 0.22);
}

.dev-actions button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.dev-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-bottom: 1rem;
}

.dev-tabs button {
  border: 1px solid var(--dev-line);
  border-radius: 12px;
  background: white;
  color: #334155;
  padding: 0.72rem 0.95rem;
  font: inherit;
  font-weight: 900;
  cursor: pointer;
}

.dev-tabs button.active {
  color: white;
  border-color: transparent;
  background: linear-gradient(135deg, var(--dev-blue), var(--dev-purple));
}

.dev-options {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  margin-top: 0.8rem;
  color: var(--dev-muted);
  font-size: 0.88rem;
  font-weight: 750;
}

.dev-options label {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}

.dev-textarea {
  width: 100%;
  min-height: 360px;
  border: 1px solid rgba(30, 41, 59, 0.14);
  border-radius: 14px;
  padding: 1rem;
  color: #0f172a;
  background: rgba(248, 250, 252, 0.82);
  font: 700 0.92rem/1.6 Consolas, "Courier New", monospace;
  outline: none;
  resize: vertical;
}

.dev-textarea[readonly] {
  background: rgba(255, 255, 255, 0.72);
}

.dev-status {
  min-height: 1.3rem;
  margin-top: 0.8rem;
  color: var(--dev-muted);
  font-weight: 750;
  line-height: 1.5;
}

.dev-status.success {
  color: var(--dev-green);
}

.dev-status.error {
  color: #dc2626;
}

.dev-info-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1.25rem;
}

.dev-info-grid article {
  padding: 1.1rem;
  display: grid;
  gap: 0.45rem;
}

.dev-info-grid i {
  width: 2.55rem;
  height: 2.55rem;
  display: grid;
  place-items: center;
  border-radius: 14px;
  color: var(--dev-blue);
  background: rgba(37, 99, 235, 0.1);
}

.dev-info-grid strong {
  font-size: 1rem;
}

.dev-info-grid span {
  color: var(--dev-muted);
  line-height: 1.5;
}

.dev-guide {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 1.25rem;
  margin-top: 2rem;
}

.dev-guide-panel {
  padding: 1.3rem;
}

.dev-guide-panel h2 {
  margin: 0 0 0.8rem;
  font-size: 1.25rem;
}

.dev-guide-panel ol,
.dev-guide-panel ul {
  margin: 0;
  padding-left: 1.2rem;
  color: #475569;
  line-height: 1.7;
}

.dev-guide-panel details {
  border-top: 1px solid var(--dev-line);
  padding: 0.85rem 0;
}

.dev-guide-panel details:first-of-type {
  border-top: 0;
}

.dev-guide-panel summary {
  cursor: pointer;
  color: var(--dev-ink);
  font-weight: 850;
}

.dev-guide-panel details p {
  margin: 0.65rem 0 0;
  color: var(--dev-muted);
  line-height: 1.65;
}

@media (max-width: 820px) {
  .dev-main {
    width: min(100% - 1rem, 720px);
  }

  .dev-workspace,
  .dev-guide,
  .dev-info-grid {
    grid-template-columns: 1fr;
  }

  .dev-toolbar {
    align-items: stretch;
    flex-direction: column;
  }

  .dev-actions {
    justify-content: flex-start;
  }

  .dev-textarea {
    min-height: 260px;
  }
}