:root {
  --ink: #11151c;
  --muted: #5d6675;
  --line: #d9dee7;
  --paper: #f7f3ea;
  --panel: #ffffff;
  --green: #1b7f5f;
  --blue: #2457c5;
  --amber: #c77719;
  --shadow: 0 18px 55px rgba(17, 21, 28, 0.12);
  --mono: "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;
  --sans: "Segoe UI", "PingFang SC", "Noto Sans CJK SC", "Helvetica Neue", Arial, sans-serif;
  --serif: Georgia, "Times New Roman", serif;
}

* {
  box-sizing: border-box;
}

html {
  color: var(--ink);
  background: var(--paper);
  font-family: var(--sans);
  line-height: 1.55;
}

body {
  margin: 0;
}

a {
  color: var(--blue);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.18em;
}

.site-header {
  border-bottom: 1px solid rgba(17, 21, 28, 0.12);
  background: rgba(247, 243, 234, 0.98);
  position: sticky;
  top: 0;
  z-index: 20;
}

.skip-link {
  left: 12px;
  position: absolute;
  top: -44px;
}

.skip-link:focus {
  background: #11151c;
  color: #fff;
  top: 8px;
  z-index: 40;
}

.nav {
  align-items: center;
  display: flex;
  gap: 24px;
  justify-content: space-between;
  margin: 0 auto;
  max-width: 1180px;
  min-height: 66px;
  padding: 0 22px;
}

.brand {
  align-items: center;
  color: var(--ink);
  display: inline-flex;
  font-family: var(--mono);
  font-size: 15px;
  font-weight: 700;
  gap: 10px;
  letter-spacing: 0;
  text-decoration: none;
}

.mark {
  align-items: center;
  background: var(--ink);
  color: #fff;
  display: inline-flex;
  height: 30px;
  justify-content: center;
  width: 30px;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.nav-links a {
  color: var(--ink);
  font-size: 14px;
  text-decoration: none;
}

.hero {
  display: grid;
  gap: 34px;
  grid-template-columns: minmax(0, 0.9fr) minmax(420px, 1.1fr);
  margin: 0 auto;
  max-width: 1180px;
  padding: 54px 22px 34px;
}

.eyebrow {
  color: var(--green);
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 700;
  margin: 0 0 14px;
  text-transform: uppercase;
}

.post-meta {
  color: var(--muted, #8a94a6);
  font-family: var(--mono);
  font-size: 13px;
  margin: -6px 0 18px;
}

h1,
h2,
h3 {
  letter-spacing: 0;
  line-height: 1.05;
}

h1 {
  font-family: var(--serif);
  font-size: clamp(44px, 7vw, 88px);
  font-weight: 700;
  margin: 0 0 22px;
  max-width: 680px;
}

h2 {
  font-family: var(--serif);
  font-size: clamp(30px, 4vw, 54px);
  margin: 0 0 16px;
}

h3 {
  font-size: 21px;
  margin: 0 0 10px;
}

.lede {
  color: #2e3540;
  font-size: 20px;
  margin: 0 0 22px;
  max-width: 680px;
}

.hero-actions,
.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.button {
  align-items: center;
  border: 1px solid var(--ink);
  color: var(--ink);
  display: inline-flex;
  font-weight: 700;
  min-height: 44px;
  padding: 10px 15px;
  text-decoration: none;
}

.button.primary {
  background: var(--ink);
  color: #fff;
}

.button:hover {
  transform: translateY(-1px);
}

.trust-strip {
  border-top: 1px solid rgba(17, 21, 28, 0.12);
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(3, 1fr);
  margin-top: 34px;
  padding-top: 22px;
}

.trust-strip strong {
  display: block;
  font-family: var(--mono);
  font-size: 13px;
}

.trust-strip span {
  color: var(--muted);
  display: block;
  font-size: 14px;
}

.tool-panel {
  background: var(--panel);
  border: 1px solid var(--ink);
  box-shadow: var(--shadow);
  padding: 22px;
}

.tool-header {
  align-items: start;
  border-bottom: 1px solid var(--line);
  display: flex;
  gap: 16px;
  justify-content: space-between;
  margin-bottom: 18px;
  padding-bottom: 18px;
}

.status-pill {
  background: #e7f5ed;
  border: 1px solid #b9d9c8;
  color: #14583f;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
  padding: 6px 8px;
  white-space: nowrap;
}

.form-grid {
  display: grid;
  gap: 14px;
}

label {
  color: #2b313b;
  display: grid;
  font-size: 13px;
  font-weight: 700;
  gap: 6px;
}

input,
textarea,
select {
  background: #fbfcfe;
  border: 1px solid #bfc7d4;
  color: var(--ink);
  font: inherit;
  min-height: 42px;
  padding: 10px;
  width: 100%;
}

textarea {
  min-height: 88px;
  resize: vertical;
}

.output {
  background: #11151c;
  color: #f8fbff;
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.55;
  min-height: 270px;
  overflow: auto;
  padding: 16px;
  white-space: pre-wrap;
}

.copy-note {
  color: var(--muted);
  font-size: 13px;
  margin: 10px 0 0;
}

.band {
  border-top: 1px solid rgba(17, 21, 28, 0.12);
  padding: 58px 22px;
}

.inner {
  margin: 0 auto;
  max-width: 1180px;
}

.section-head {
  display: grid;
  gap: 14px;
  grid-template-columns: minmax(0, 0.9fr) minmax(280px, 0.7fr);
  margin-bottom: 26px;
}

.section-head p {
  color: var(--muted);
  font-size: 18px;
  margin: 8px 0 0;
}

.grid {
  display: grid;
  gap: 16px;
}

.grid.three {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid.two {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.card {
  background: var(--panel);
  border: 1px solid var(--line);
  min-height: 100%;
  padding: 20px;
}

.card strong,
.metric strong {
  color: var(--green);
  display: block;
  font-family: var(--mono);
  font-size: 13px;
  margin-bottom: 8px;
}

.card p {
  color: var(--muted);
  margin: 0 0 14px;
}

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

.check-pass,
.check-fix {
  border: 1px solid var(--line);
  display: grid;
  gap: 3px;
  grid-template-columns: 58px 1fr;
  padding: 12px;
}

.check-pass strong {
  color: var(--green);
  font-family: var(--mono);
}

.check-fix strong {
  color: var(--amber);
  font-family: var(--mono);
}

.check-pass small,
.check-fix small {
  color: var(--muted);
  grid-column: 2;
}

.tool-table {
  border-collapse: collapse;
  width: 100%;
}

.tool-table th,
.tool-table td {
  border: 1px solid var(--line);
  font-size: 14px;
  padding: 8px;
  text-align: left;
  vertical-align: top;
}

.source-list {
  border-top: 1px solid var(--line);
  margin-top: 28px;
  padding-top: 18px;
}

.source-list li {
  font-size: 15px;
}

.metric-row {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(4, 1fr);
}

.metric {
  border-top: 3px solid var(--ink);
  padding-top: 14px;
}

.metric b {
  display: block;
  font-size: 27px;
}

.article {
  background: #fff;
  border-top: 1px solid rgba(17, 21, 28, 0.12);
  padding: 46px 22px 70px;
}

.article-inner {
  margin: 0 auto;
  max-width: 820px;
}

.article h1 {
  font-size: clamp(38px, 6vw, 70px);
}

.article p,
.article li {
  color: #2e3540;
  font-size: 18px;
}

.article code {
  background: #eef1f5;
  font-family: var(--mono);
  font-size: 0.88em;
  padding: 2px 5px;
}

.article pre {
  background: #11151c;
  color: #f8fbff;
  overflow: auto;
  padding: 18px;
}

.article pre code {
  background: transparent;
  color: inherit;
  padding: 0;
}

.article .table-wrap {
  border: 1px solid var(--line);
  margin: 22px 0;
  overflow-x: auto;
}

.article table {
  border-collapse: collapse;
  min-width: 760px;
  width: 100%;
}

.article th,
.article td {
  border-bottom: 1px solid var(--line);
  padding: 12px 14px;
  text-align: left;
  vertical-align: top;
}

.article th {
  background: #f7f3ea;
  color: var(--ink);
  font-weight: 800;
}

.article tr:last-child td {
  border-bottom: 0;
}

.toc {
  background: #f7f3ea;
  border: 1px solid var(--line);
  margin: 24px 0;
  padding: 16px;
}

.toc a {
  display: block;
  margin: 6px 0;
}

.site-footer {
  background: var(--ink);
  color: #eef1f5;
  padding: 34px 22px;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: space-between;
  margin: 0 auto;
  max-width: 1180px;
}

.site-footer a {
  color: #d7e4ff;
}

@media (max-width: 880px) {
  .hero,
  .section-head,
  .grid.three,
  .grid.two,
  .metric-row {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 34px;
  }

  .tool-panel {
    padding: 16px;
  }

  .trust-strip {
    grid-template-columns: 1fr;
  }

  .nav {
    align-items: flex-start;
    flex-direction: column;
    gap: 10px;
    padding-bottom: 14px;
    padding-top: 14px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}