/* ===== 本草智典 · 共享样式 ===== */

:root {
  --paper: #EDE6D6;
  --paper-deep: #E3D9C3;
  --ink: #262019;
  --ink-soft: #5C5344;
  --pine: #3F4F3A;
  --seal: #A23B2E;
  --gold: #9C7A34;
  --line: rgba(38, 32, 25, 0.16);

  --font-display: "Noto Serif SC", "Songti SC", serif;
  --font-seal: "Ma Shan Zheng", "Kaiti SC", cursive;

  --max-width: 920px;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-display);
  font-weight: 400;
  line-height: 1.9;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 28px;
}

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

a { color: inherit; }

/* ---- Header ---- */

header.site-header {
  border-bottom: 0.5px solid var(--line);
  padding: 22px 0;
}

header.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
  text-decoration: none;
  color: var(--ink);
}

.brand-name {
  font-weight: 900;
  font-size: 22px;
  letter-spacing: 1px;
}

.brand-seal {
  font-family: var(--font-seal);
  font-size: 15px;
  color: var(--seal);
  border: 1px solid var(--seal);
  padding: 1px 7px;
  line-height: 1.5;
}

nav.site-nav {
  display: flex;
  gap: 28px;
  font-size: 15px;
}

nav.site-nav a {
  text-decoration: none;
  color: var(--ink-soft);
  padding-bottom: 3px;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

nav.site-nav a:hover,
nav.site-nav a[aria-current="page"] {
  color: var(--ink);
  border-color: var(--seal);
}

/* ---- Sections ---- */

section {
  padding: 64px 0;
  border-bottom: 0.5px solid var(--line);
}

section:last-of-type { border-bottom: none; }

.section-label {
  font-size: 13px;
  color: var(--ink-soft);
  margin: 0 0 20px;
}

h1 {
  font-weight: 900;
  font-size: clamp(32px, 6vw, 48px);
  letter-spacing: 1px;
  margin: 0 0 14px;
  line-height: 1.4;
}

h2 {
  font-weight: 900;
  font-size: clamp(24px, 4vw, 30px);
  margin: 0 0 18px;
  line-height: 1.5;
}

h3 {
  font-weight: 700;
  font-size: 18px;
  margin: 0 0 10px;
}

p {
  margin: 0 0 16px;
  color: var(--ink-soft);
  max-width: 56ch;
}

p:last-child { margin-bottom: 0; }

.tagline {
  font-family: var(--font-seal);
  font-size: 21px;
  color: var(--seal);
  margin: 8px 0 22px;
}

/* ---- Hero ---- */

.hero {
  padding: 76px 0 64px;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 24px;
  margin-top: 28px;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 14px;
  text-decoration: none;
  padding: 11px 24px;
  cursor: pointer;
  border: 1px solid transparent;
  transition: opacity 0.2s ease, background 0.2s ease;
}

.btn-primary {
  background: var(--pine);
  color: var(--paper);
}

.btn-primary:hover { opacity: 0.88; }

.btn-link {
  color: var(--pine);
  border-bottom: 1px solid var(--pine);
  padding: 11px 0;
}

.btn-link:hover { color: var(--seal); border-color: var(--seal); }

/* ---- Source list (三栏典籍来源) ---- */

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

.source-grid > div {
  padding: 0 28px;
  border-right: 0.5px solid var(--gold);
}

.source-grid > div:first-child { padding-left: 0; }
.source-grid > div:last-child { border-right: none; padding-right: 0; }

.source-grid h3 {
  font-size: 19px;
  margin-bottom: 12px;
}

/* ---- Value / feature list ---- */

.value-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  margin-top: 12px;
}

.value-list h3 {
  color: var(--pine);
  font-size: 17px;
}

/* ---- Steps (产品详情 · 怎么用) ---- */

.steps {
  counter-reset: step;
  display: grid;
  gap: 26px;
  margin-top: 8px;
}

.step {
  display: flex;
  gap: 20px;
  align-items: baseline;
}

.step::before {
  counter-increment: step;
  content: counter(step);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 22px;
  color: var(--gold);
  min-width: 30px;
}

.step p { margin: 0; }

/* ---- Audience list ---- */

.audience-list {
  margin: 8px 0 0;
  padding: 0;
  list-style: none;
}

.audience-list li {
  padding: 14px 0;
  border-bottom: 0.5px solid var(--line);
  color: var(--ink-soft);
  max-width: 56ch;
}

.audience-list li:last-child { border-bottom: none; }

/* ---- Card blocks (关于我们) ---- */

.about-block + .about-block {
  margin-top: 8px;
}

/* ---- CTA band ---- */

.cta-band {
  text-align: left;
}

.cta-band .tagline { margin-top: 0; }

.note {
  font-size: 13px;
  color: var(--ink-soft);
  margin-top: 12px;
}

/* ---- Footer ---- */

footer.site-footer {
  padding: 32px 0 56px;
  font-size: 13px;
  color: var(--ink-soft);
}

footer.site-footer .wrap {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---- Responsive ---- */

@media (max-width: 720px) {
  .wrap { padding: 0 20px; }
  section { padding: 44px 0; }
  .hero { padding: 52px 0 44px; }

  .source-grid,
  .value-list {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .source-grid > div {
    padding: 0 0 24px;
    border-right: none;
    border-bottom: 0.5px solid var(--gold);
  }

  .source-grid > div:last-child {
    border-bottom: none;
    padding-bottom: 0;
  }

  nav.site-nav { gap: 18px; font-size: 14px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}

/* ---- Focus visibility ---- */

a:focus-visible,
.btn:focus-visible {
  outline: 2px solid var(--seal);
  outline-offset: 2px;
}