.tool-nav {
  border-bottom: 1px solid var(--hair);
  background: rgba(244, 243, 238, 0.94);
}

.tool-nav-inner {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.tool-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-weight: 600;
}

.tool-logo img { width: 24px; height: 24px; }
.tool-nav-links { display: flex; align-items: center; gap: 22px; font-size: 0.9rem; }
.tool-nav-links a { min-height: 44px; display: inline-flex; align-items: center; }

.tool-shell { max-width: 940px; margin: 0 auto; padding: 68px 40px 80px; }
.tool-hero { max-width: 760px; }
.tool-hero h1 {
  margin: 14px 0 20px;
  font-size: clamp(2.7rem, 7.5vw, 5.8rem);
  line-height: 0.94;
  letter-spacing: -0.052em;
}
.tool-lede { max-width: 650px; color: var(--ink2); font-size: 1.1rem; line-height: 1.65; }
.tool-proof { margin-top: 22px; font-family: var(--mono); font-size: 11px; letter-spacing: 0.06em; text-transform: uppercase; color: var(--ink3); }

.diagnostic-form, .diagnostic-result, .no-js-guide {
  margin-top: 42px;
  padding: 30px;
  border: 1px solid var(--ink);
  background: var(--surface);
}

.diagnostic-form fieldset { border: 0; }
.diagnostic-form legend { margin-bottom: 24px; font-size: 1.35rem; font-weight: 600; }
.field-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px 22px; }
.field label { display: block; margin-bottom: 7px; font-weight: 500; }
.field-hint { display: block; margin-top: 5px; color: var(--ink3); font-size: 0.8rem; }
.field-wide { grid-column: 1 / -1; }

.field input, .field select {
  width: 100%;
  min-height: 48px;
  padding: 10px 12px;
  border: 1px solid #8b8a84;
  border-radius: 0;
  background: #fff;
  color: var(--ink);
  font: inherit;
  font-size: 16px;
}

.field input:focus-visible, .field select:focus-visible, .tool-action:focus-visible,
.tool-nav a:focus-visible, .diagnostic-result:focus-visible {
  outline: 3px solid var(--klein);
  outline-offset: 3px;
}

.tool-action {
  min-height: 48px;
  padding: 13px 20px;
  border: 1px solid var(--ink);
  border-radius: 0;
  background: var(--ink);
  color: #fff;
  font: 500 12px/1 var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  cursor: pointer;
}
.form-submit { width: 100%; margin-top: 22px; }
.tool-error { min-height: 1.5rem; margin-top: 12px; color: #8b0000; }

.diagnostic-result { scroll-margin-top: 24px; }
.diagnostic-result h2 { margin: 10px 0 12px; font-size: clamp(2rem, 5vw, 3.2rem); line-height: 1.05; }
.diagnostic-result h3 { margin-top: 28px; }
.diagnostic-result ol { margin-top: 14px; padding-left: 24px; }
.diagnostic-result li { margin: 10px 0; color: var(--ink2); }
.diagnostic-rule { margin: 24px 0; padding: 18px 20px; border-left: 4px solid var(--klein); background: var(--klein-wash); }
.diagnostic-rule p { margin-top: 7px; }
.result-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.result-actions a { text-decoration: none; background: var(--klein); border-color: var(--klein); }
.copy-status { width: 100%; min-height: 1.3rem; color: var(--ink3); font-size: 0.85rem; }
.tool-sources { margin-top: 36px; padding-top: 22px; border-top: 1px solid var(--hair); color: var(--ink3); font-size: 0.9rem; }
.tool-sources a { text-underline-offset: 3px; }

.no-js-guide h2 { margin-bottom: 12px; }
.no-js-guide h3 { margin-top: 24px; }
.no-js-guide ol { padding-left: 22px; }
.no-js-guide li { margin-top: 8px; }

@media (max-width: 680px) {
  .tool-nav-inner { align-items: flex-start; flex-direction: column; gap: 4px; padding-top: 14px; padding-bottom: 14px; }
  .tool-nav-links { width: 100%; gap: 16px; flex-wrap: wrap; }
  .tool-shell { padding: 42px 24px 64px; }
  .field-grid { grid-template-columns: 1fr; }
  .field-wide { grid-column: auto; }
  .diagnostic-form, .diagnostic-result, .no-js-guide { padding: 22px 18px; }
  .result-actions { flex-direction: column; }
  .result-actions .tool-action { width: 100%; text-align: center; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}