:root {
  --ink: #14211f;
  --muted: #52615e;
  --line: #d9e1dd;
  --paper: #fbfaf5;
  --surface: #ffffff;
  --soft: #edf4ee;
  --mint: #007f68;
  --mint-dark: #075847;
  --gold: #d89b27;
  --rose: #c65b55;
  --blue: #3c6f9f;
  --shadow: 0 18px 50px rgba(20, 33, 31, 0.11);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(90deg, rgba(20, 33, 31, 0.035) 1px, transparent 1px),
    linear-gradient(rgba(20, 33, 31, 0.028) 1px, transparent 1px),
    var(--paper);
  background-size: 42px 42px;
  font-family: "Noto Serif SC", "Songti SC", "Source Han Serif SC", Georgia, serif;
  line-height: 1.7;
}

a {
  color: var(--mint-dark);
  text-underline-offset: 4px;
}

img {
  max-width: 100%;
  display: block;
}

.site-shell {
  min-height: 100vh;
}

.site-nav {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 16px clamp(18px, 5vw, 72px);
  background: rgba(251, 250, 245, 0.92);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-weight: 800;
  text-decoration: none;
  white-space: nowrap;
}

.brand-mark {
  display: grid;
  width: 30px;
  height: 30px;
  place-items: center;
  color: #fff;
  background: var(--ink);
  border-radius: 7px;
  font-family: Georgia, serif;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 24px);
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 14px;
}

.nav-links a {
  color: var(--muted);
  text-decoration: none;
}

.nav-links a:hover {
  color: var(--ink);
}

.nav-cta,
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 42px;
  padding: 0 18px;
  color: #fff;
  background: var(--ink);
  border: 1px solid var(--ink);
  border-radius: 7px;
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
  font-weight: 700;
  text-decoration: none;
}

.button.secondary {
  color: var(--ink);
  background: transparent;
}

.button.ghost {
  color: var(--mint-dark);
  background: rgba(0, 127, 104, 0.08);
  border-color: rgba(0, 127, 104, 0.24);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(320px, 0.95fr);
  gap: clamp(28px, 5vw, 72px);
  align-items: center;
  padding: clamp(56px, 8vw, 116px) clamp(18px, 5vw, 72px) clamp(42px, 7vw, 88px);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  gap: 8px;
  padding: 6px 10px;
  color: var(--mint-dark);
  background: rgba(0, 127, 104, 0.09);
  border: 1px solid rgba(0, 127, 104, 0.22);
  border-radius: 999px;
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 13px;
  font-weight: 700;
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.14;
  letter-spacing: 0;
}

h1 {
  max-width: 860px;
  margin-top: 18px;
  font-size: clamp(38px, 6vw, 82px);
}

h2 {
  font-size: clamp(28px, 4vw, 48px);
}

h3 {
  font-size: clamp(21px, 2.2vw, 29px);
}

.lead {
  max-width: 760px;
  margin: 22px 0 0;
  color: var(--muted);
  font-size: clamp(18px, 2vw, 22px);
}

.hero-actions,
.section-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.hero-proof {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-top: 34px;
}

.proof-item {
  padding: 14px;
  background: rgba(255, 255, 255, 0.74);
  border: 1px solid var(--line);
  border-radius: 8px;
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
}

.proof-item strong {
  display: block;
  font-size: 20px;
}

.proof-item span {
  color: var(--muted);
  font-size: 13px;
}

.hero-visual {
  position: relative;
}

.product-frame {
  overflow: hidden;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.product-frame img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  object-position: top center;
}

.diagnostic-strip {
  position: absolute;
  right: -18px;
  bottom: -22px;
  width: min(84%, 390px);
  padding: 18px;
  background: var(--ink);
  color: #fff;
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.diagnostic-strip span {
  display: block;
  color: #c8d8d3;
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 13px;
}

.diagnostic-strip strong {
  display: block;
  margin-top: 4px;
  font-size: 18px;
  line-height: 1.45;
}

.band {
  padding: clamp(48px, 7vw, 92px) clamp(18px, 5vw, 72px);
}

.band.surface {
  background: rgba(255, 255, 255, 0.72);
  border-block: 1px solid var(--line);
}

.section-head {
  display: grid;
  grid-template-columns: minmax(0, 0.82fr) minmax(260px, 0.45fr);
  gap: 28px;
  align-items: end;
  margin-bottom: 30px;
}

.section-head p,
.article p,
.page-lead {
  color: var(--muted);
}

.grid-3,
.grid-2,
.article-grid {
  display: grid;
  gap: 18px;
}

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

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

.feature-card,
.post-card,
.step,
.metric,
.quote-panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 8px 24px rgba(20, 33, 31, 0.06);
}

.feature-card,
.post-card,
.step,
.metric {
  padding: 22px;
}

.feature-card .tag,
.post-card .tag {
  display: inline-flex;
  margin-bottom: 18px;
  color: var(--rose);
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 13px;
  font-weight: 800;
}

.feature-card p,
.post-card p,
.step p,
.metric p {
  color: var(--muted);
}

.steps {
  display: grid;
  gap: 16px;
  counter-reset: steps;
}

.step {
  position: relative;
  padding-left: 72px;
}

.step::before {
  position: absolute;
  top: 22px;
  left: 22px;
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  color: #fff;
  background: var(--mint);
  border-radius: 50%;
  counter-increment: steps;
  content: counter(steps);
  font-family: Georgia, serif;
  font-weight: 800;
}

.quote-panel {
  padding: clamp(26px, 4vw, 44px);
  background: var(--ink);
  color: #fff;
}

.quote-panel p {
  color: #dce7e3;
  font-size: clamp(20px, 2.4vw, 30px);
}

.article {
  max-width: 860px;
  margin: 0 auto;
  padding: clamp(44px, 7vw, 82px) 18px;
}

.article h1 {
  font-size: clamp(34px, 5vw, 62px);
}

.article h2 {
  margin-top: 44px;
  font-size: clamp(26px, 3vw, 38px);
}

.article h3 {
  margin-top: 30px;
}

.article ul,
.article ol {
  padding-left: 1.3em;
}

.article li {
  margin: 8px 0;
}

.article code,
.prompt-box {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

.prompt-box,
.checklist-box {
  margin: 24px 0;
  padding: 22px;
  background: #f5f1e6;
  border: 1px solid #e2d6bd;
  border-radius: 8px;
  white-space: pre-wrap;
}

.article-meta {
  margin-top: 16px;
  color: var(--muted);
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
}

.toc {
  margin: 28px 0;
  padding: 20px;
  background: rgba(0, 127, 104, 0.08);
  border: 1px solid rgba(0, 127, 104, 0.2);
  border-radius: 8px;
}

.cta-band {
  margin-top: 42px;
  padding: 28px;
  color: #fff;
  background: linear-gradient(135deg, var(--mint-dark), var(--ink));
  border-radius: 8px;
}

.cta-band p {
  color: #dce7e3;
}

.site-footer {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 24px;
  padding: 34px clamp(18px, 5vw, 72px);
  color: var(--muted);
  border-top: 1px solid var(--line);
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 14px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

@media (max-width: 920px) {
  .hero,
  .section-head,
  .grid-3,
  .grid-2,
  .article-grid,
  .site-footer {
    grid-template-columns: 1fr;
  }

  .hero-proof {
    grid-template-columns: 1fr;
  }

  .diagnostic-strip {
    position: static;
    width: 100%;
    margin-top: 14px;
  }

  .nav-links {
    display: none;
  }
}

@media (max-width: 560px) {
  .site-nav {
    padding-inline: 14px;
  }

  .hero,
  .band {
    padding-inline: 14px;
  }

  .hero-actions,
  .section-actions {
    flex-direction: column;
  }

  .button,
  .nav-cta {
    width: 100%;
  }

  .step {
    padding-left: 22px;
    padding-top: 64px;
  }
}