:root {
  --primary: #CC785C;
  --primary-soft: color-mix(in oklch, var(--primary) 14%, var(--bg));
  --primary-ink: color-mix(in oklch, var(--primary) 75%, #2A1F1A);
  --bg: #F5F1EB;
  --surface: #FBF8F2;
  --surface-2: #FFFFFF;
  --ink: #1F1A17;
  --ink-2: #4A4239;
  --ink-3: #7A7064;
  --line: #E5DDD0;
  --line-2: #ECE5D9;
  --serif: "Source Serif 4", "Noto Serif SC", Georgia, serif;
  --sans: "Inter", "PingFang SC", "Hiragino Sans GB", system-ui, -apple-system, sans-serif;
  --mono: "JetBrains Mono", "SF Mono", ui-monospace, monospace;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-size: 16px;
  line-height: 1.55;
}

a { color: inherit; text-decoration: none; }
em { font-style: italic; color: var(--primary); }

.container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 28px;
}

/* ============ Buttons ============ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 40px;
  padding: 0 18px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 500;
  font-family: var(--sans);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.18s ease;
  white-space: nowrap;
}
.btn-lg { height: 50px; padding: 0 26px; font-size: 15px; }
.btn-block { width: 100%; }
.btn-primary {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}
.btn-primary:hover { background: color-mix(in oklch, var(--primary) 88%, #000); }
.btn-ghost {
  background: transparent;
  color: var(--ink);
}
.btn-ghost:hover { background: rgba(0,0,0,0.05); }
.btn-outline {
  background: transparent;
  color: var(--ink);
  border-color: var(--line);
}
.btn-outline:hover { border-color: var(--ink); }
.arr { transition: transform 0.18s ease; }
.btn:hover .arr { transform: translateX(2px); }

/* ============ Nav ============ */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in oklch, var(--bg) 92%, transparent);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid color-mix(in oklch, var(--line) 50%, transparent);
}
.nav-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 14px 28px;
  display: flex;
  align-items: center;
  gap: 32px;
}
.logo {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-weight: 600;
  font-size: 17px;
  letter-spacing: -0.01em;
}
.nav-links {
  display: flex;
  gap: 26px;
  font-size: 14px;
  color: var(--ink-2);
}
.nav-links a:hover { color: var(--ink); }
.nav-docs { color: var(--ink-3) !important; }
.nav-cta { margin-left: auto; display: flex; gap: 8px; }
@media (max-width: 820px) {
  .nav-links { display: none; }
}

/* ============ Hero ============ */
.hero { padding: 96px 0 32px; position: relative; }
.hero-inner { max-width: 880px; }
.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: 999px;
  background: var(--surface);
  border: 1px solid var(--line);
  font-size: 13px;
  color: var(--ink-2);
  margin-bottom: 32px;
}
.hero-eyebrow .dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--primary);
  box-shadow: 0 0 0 4px color-mix(in oklch, var(--primary) 22%, transparent);
}
.hero-title {
  font-family: var(--serif);
  font-size: clamp(40px, 6.4vw, 76px);
  line-height: 1.04;
  letter-spacing: -0.02em;
  font-weight: 400;
  margin: 0 0 24px;
  text-wrap: pretty;
}
.hero-sub {
  font-size: clamp(16px, 1.8vw, 19px);
  line-height: 1.6;
  color: var(--ink-2);
  max-width: 620px;
  margin: 0 0 36px;
}
.md-only { display: none; }
@media (min-width: 720px) { .md-only { display: inline; } }
.hero-cta { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 28px; }
.hero-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-size: 13.5px;
  color: var(--ink-3);
}
.hero-meta .dot-sep { opacity: 0.4; }

/* Hero demo */
.hero-demo {
  margin-top: 52px;
  max-width: 720px;
}

/* Code card */
.code-card {
  background: #1F1A17;
  border-radius: 14px;
  overflow: hidden;
  border: 1px solid #2c2520;
  box-shadow: 0 24px 60px -30px rgba(38, 22, 12, 0.45),
              0 4px 14px -6px rgba(38, 22, 12, 0.25);
}
.code-head {
  display: flex;
  align-items: center;
  padding: 10px 14px;
  background: #181412;
  border-bottom: 1px solid #2c2520;
  gap: 6px;
  font-size: 12.5px;
}
.code-tab {
  padding: 5px 12px;
  border-radius: 6px;
  color: #8a7e74;
  font-family: var(--mono);
  cursor: default;
}
.code-tab.active {
  background: #2a2420;
  color: #f3ebe1;
}
.code-copy {
  margin-left: auto;
  font-size: 12px;
  color: #8a7e74;
  cursor: pointer;
  font-family: var(--sans);
}
.code-copy:hover { color: #f3ebe1; }
.code-body {
  margin: 0;
  padding: 22px 24px 26px;
  font-family: var(--mono);
  font-size: 13.5px;
  line-height: 1.75;
  color: #e8dfd3;
  white-space: pre;
  overflow-x: auto;
}
.c-cm  { color: #807468; font-style: italic; }
.c-kw  { color: #E69982; }
.c-id  { color: #d8c8b8; }
.c-str { color: #B8C99A; }
.c-num { color: #E6B98A; }
.c-cmd { color: #f3ebe1; font-weight: 600; }
.code-card-flat {
  box-shadow: 0 8px 28px -16px rgba(38, 22, 12, 0.3);
}

/* Terminal */
.terminal {
  background: #1F1A17;
  border-radius: 14px;
  overflow: hidden;
  border: 1px solid #2c2520;
  box-shadow: 0 24px 60px -30px rgba(38, 22, 12, 0.45);
}
.term-bar {
  display: flex; align-items: center;
  padding: 12px 14px;
  background: #181412;
  border-bottom: 1px solid #2c2520;
  gap: 7px;
  position: relative;
}
.term-bar > span:not(.term-title) {
  width: 12px; height: 12px; border-radius: 50%;
  background: #3a3530;
}
.term-title {
  position: absolute;
  left: 50%; transform: translateX(-50%);
  font-family: var(--mono);
  font-size: 12px;
  color: #8a7e74;
}
.term-body {
  padding: 22px 24px 26px;
  font-family: var(--mono);
  font-size: 13.5px;
  line-height: 1.85;
  color: #e8dfd3;
}
.term-prompt { color: var(--primary); margin-right: 10px; }
.term-cmd { color: #E69982; font-weight: 600; }
.term-arg { color: #B8C99A; }
.term-out { color: #b8ad9f; }
.term-dim { color: #807468; }
.term-caret { color: var(--primary); animation: caret 1s steps(1) infinite; }
@keyframes caret { 50% { opacity: 0; } }

/* Minimal hero demo */
.hero-demo-minimal {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 22px 26px;
  max-width: 560px;
}
.key-row {
  display: flex; align-items: center; gap: 14px;
  flex-wrap: wrap;
}
.key-label {
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--ink-3);
  font-weight: 600;
}
.key-value {
  flex: 1;
  font-family: var(--mono);
  font-size: 14px;
  color: var(--ink);
  background: var(--bg);
  padding: 8px 12px;
  border-radius: 6px;
}
.key-copy {
  background: var(--primary);
  color: #fff;
  border: none;
  padding: 8px 14px;
  border-radius: 6px;
  font-size: 13px;
  cursor: pointer;
  font-family: var(--sans);
}
.key-foot {
  margin-top: 14px;
  font-size: 13px;
  color: var(--ink-3);
}

/* ============ Trust ============ */
.trust { padding: 36px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); margin-top: 80px; }
.trust-inner {
  display: flex;
  align-items: center;
  gap: 36px;
  flex-wrap: wrap;
}
.trust-label {
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--ink-3);
  text-transform: uppercase;
  font-weight: 600;
}
.trust-logos {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 22px;
  font-size: 15px;
  color: var(--ink-2);
  font-weight: 500;
  font-family: var(--serif);
  letter-spacing: -0.01em;
}
.trust-logos .sep {
  width: 4px; height: 4px; border-radius: 50%;
  background: var(--line);
}

/* ============ Sections ============ */
.section-head { max-width: 720px; margin-bottom: 56px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.kicker {
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--primary);
  text-transform: uppercase;
  font-weight: 600;
  margin-bottom: 18px;
}
.section-title {
  font-family: var(--serif);
  font-size: clamp(32px, 4.4vw, 52px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  font-weight: 400;
  margin: 0 0 18px;
  text-wrap: balance;
}
.section-sub {
  font-size: 17px;
  color: var(--ink-2);
  line-height: 1.6;
  margin: 0;
  max-width: 640px;
}
.section-head.center .section-sub { margin-left: auto; margin-right: auto; }

/* ============ Benefits ============ */
.benefits { padding: 110px 0; }
.benefit-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
@media (max-width: 900px) { .benefit-grid { grid-template-columns: 1fr; } }
.benefit-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 32px 28px 30px;
  position: relative;
  transition: border-color 0.2s ease, transform 0.2s ease;
}
.benefit-card:hover { border-color: var(--primary); }
.benefit-num {
  position: absolute;
  top: 28px; right: 28px;
  font-family: var(--serif);
  font-size: 14px;
  color: var(--ink-3);
  letter-spacing: 0.04em;
}
.benefit-icon {
  width: 56px; height: 56px;
  border-radius: 14px;
  background: var(--primary-soft);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 24px;
}
.benefit-title {
  font-family: var(--serif);
  font-size: 26px;
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin: 0 0 12px;
  font-weight: 500;
}
.benefit-desc {
  font-size: 15px;
  line-height: 1.65;
  color: var(--ink-2);
  margin: 0 0 22px;
}
.benefit-list {
  list-style: none;
  padding: 0; margin: 0;
  border-top: 1px solid var(--line);
  padding-top: 18px;
}
.benefit-list li {
  font-size: 14px;
  color: var(--ink-2);
  padding: 5px 0;
  display: flex;
  align-items: center;
}

/* ============ Pricing ============ */
.pricing { padding: 110px 0; background: var(--surface); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
  max-width: 1080px;
  margin: 0 auto;
}
@media (max-width: 900px) { .pricing-grid { grid-template-columns: 1fr; } }

.tier {
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 34px 30px 32px;
  display: flex;
  flex-direction: column;
  position: relative;
}
.tier-featured {
  background: #1F1A17;
  color: #f1e7da;
  border-color: #1F1A17;
  transform: translateY(-8px);
  box-shadow: 0 24px 60px -30px rgba(38,22,12,0.4);
}
.tier-featured .tier-name { color: var(--primary); }
.tier-featured .cny { color: #fff; }
.tier-featured .usd { color: #b8ad9f; }
.tier-featured .usd strong { color: #fff; }
.tier-featured .tier-bonus { background: color-mix(in oklch, var(--primary) 22%, #1F1A17); color: #f1e7da; }
.tier-featured .tier-hint { color: #b8ad9f; }
.tier-featured .tier-features li { color: #d8cfc0; border-color: #2c2520; }
.tier-featured .tier-features { border-color: #2c2520; }

.ribbon {
  position: absolute;
  top: -13px; left: 50%; transform: translateX(-50%);
  background: var(--primary);
  color: #fff;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  padding: 5px 14px;
  border-radius: 999px;
}
.tier-name {
  font-family: var(--serif);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--primary);
  margin-bottom: 16px;
  text-transform: uppercase;
}
.tier-price {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 6px;
}
.cny {
  font-family: var(--serif);
  font-size: 56px;
  font-weight: 400;
  letter-spacing: -0.02em;
  line-height: 1;
}
.usd {
  font-size: 14px;
  color: var(--ink-3);
}
.usd strong { color: var(--ink); font-weight: 600; }
.tier-bonus {
  display: inline-block;
  background: var(--primary-soft);
  color: var(--primary-ink);
  font-size: 13px;
  padding: 5px 12px;
  border-radius: 999px;
  margin-top: 14px;
  font-weight: 500;
  align-self: flex-start;
}
.tier-hint {
  font-size: 14px;
  color: var(--ink-3);
  margin-top: 14px;
  margin-bottom: 24px;
  line-height: 1.5;
}
.tier-features {
  list-style: none;
  padding: 0;
  margin: 0 0 28px;
  border-top: 1px solid var(--line);
  padding-top: 18px;
  flex: 1;
}
.tier-features li {
  font-size: 14px;
  color: var(--ink-2);
  padding: 7px 0;
  display: flex;
  align-items: flex-start;
  line-height: 1.5;
}
.tier-featured .btn-primary { background: var(--primary); border-color: var(--primary); }

.pricing-extra {
  margin-top: 40px;
  max-width: 1080px;
  margin-left: auto; margin-right: auto;
  display: flex;
  align-items: stretch;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 22px 28px;
  gap: 28px;
  flex-wrap: wrap;
}
.extra-item { flex: 1; min-width: 240px; }
.extra-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 4px;
}
.extra-item p {
  font-size: 14px;
  color: var(--ink-2);
  margin: 0;
}
.extra-item a { color: var(--primary); font-weight: 500; }
.extra-divider {
  width: 1px;
  background: var(--line);
}
@media (max-width: 720px) { .extra-divider { display: none; } }

/* ============ Integration ============ */
.integration { padding: 110px 0; }
.integ-inner {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 60px;
  align-items: center;
}
@media (max-width: 900px) { .integ-inner { grid-template-columns: 1fr; gap: 40px; } }
.integ-text { max-width: 480px; }
.integ-text code {
  font-family: var(--mono);
  font-size: 13px;
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 1px 7px;
  border-radius: 5px;
  color: var(--primary-ink);
}
.integ-tags {
  display: flex; flex-wrap: wrap; gap: 8px;
  margin: 26px 0 28px;
}
.integ-tags span {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 6px 13px;
  font-size: 13px;
  color: var(--ink-2);
}
.link-arrow {
  color: var(--primary);
  font-weight: 500;
  font-size: 15px;
  border-bottom: 1px solid color-mix(in oklch, var(--primary) 40%, transparent);
  padding-bottom: 2px;
}
.link-arrow:hover { border-bottom-color: var(--primary); }

/* ============ FAQ ============ */
.faq { padding: 110px 0; background: var(--surface); border-top: 1px solid var(--line); }
.faq-inner {
  display: grid;
  grid-template-columns: 360px 1fr;
  gap: 80px;
}
@media (max-width: 900px) { .faq-inner { grid-template-columns: 1fr; gap: 40px; } }
.faq-head a { color: var(--primary); border-bottom: 1px solid currentColor; }
.faq-list {
  border-top: 1px solid var(--line);
}
.faq-item {
  border-bottom: 1px solid var(--line);
}
.faq-q {
  width: 100%;
  background: none;
  border: none;
  padding: 22px 0;
  text-align: left;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  font-family: var(--serif);
  font-size: 19px;
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--ink);
  font-feature-settings: "ss01";
}
.faq-q:hover { color: var(--primary); }
.faq-toggle {
  position: relative;
  width: 16px; height: 16px;
  flex-shrink: 0;
}
.bar {
  position: absolute;
  background: currentColor;
  transition: transform 0.25s ease;
}
.bar-h { top: 7px; left: 0; width: 16px; height: 1.5px; }
.bar-v { left: 7px; top: 0; width: 1.5px; height: 16px; }
.faq-item.open .bar-v { transform: scaleY(0); }
.faq-a-wrap {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.28s ease;
}
.faq-item.open .faq-a-wrap { grid-template-rows: 1fr; }
.faq-a {
  overflow: hidden;
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink-2);
  padding-right: 40px;
}
.faq-item.open .faq-a { padding-bottom: 22px; }

/* ============ CTA banner ============ */
.cta-banner { padding: 110px 0 130px; text-align: center; }
.cta-inner { max-width: 720px; }
.cta-title {
  font-family: var(--serif);
  font-size: clamp(34px, 4.6vw, 56px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  font-weight: 400;
  margin: 0 0 18px;
}
.cta-sub {
  font-size: 17px;
  color: var(--ink-2);
  margin: 0 0 32px;
}
.cta-banner .hero-cta { justify-content: center; }

/* ============ Footer ============ */
.footer {
  background: #1F1A17;
  color: #d8cfc0;
}
.footer-inner {
  display: grid;
  grid-template-columns: 1.4fr 2fr;
  gap: 60px;
  padding: 70px 28px 50px;
  max-width: 1180px;
  margin: 0 auto;
}
@media (max-width: 720px) { .footer-inner { grid-template-columns: 1fr; gap: 40px; padding: 56px 28px 36px; } }
.footer-brand .logo { color: #fff; margin-bottom: 16px; }
.footer-desc {
  color: #a89c8d;
  font-size: 14.5px;
  line-height: 1.6;
  max-width: 320px;
}
.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}
@media (max-width: 600px) { .footer-cols { grid-template-columns: repeat(2, 1fr); } }
.footer-col-title {
  font-family: var(--serif);
  font-size: 15px;
  font-weight: 500;
  color: #fff;
  margin-bottom: 16px;
}
.footer-col ul { list-style: none; padding: 0; margin: 0; }
.footer-col li { padding: 5px 0; }
.footer-col a {
  font-size: 14px;
  color: #a89c8d;
}
.footer-col a:hover { color: #fff; }

.footer-bot {
  border-top: 1px solid #2c2520;
}
.footer-bot-inner {
  padding: 22px 28px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  color: #807468;
  flex-wrap: wrap;
  gap: 14px;
}
.footer-legal { display: flex; gap: 22px; flex-wrap: wrap; }
.footer-legal a:hover { color: #d8cfc0; }

/* ============ Responsive nav cta ============ */
@media (max-width: 520px) {
  .nav-cta .btn-ghost { display: none; }
  .hero { padding: 64px 0 16px; }
  .hero-meta { font-size: 13px; }
  .nav-inner { padding: 12px 20px; }
  .container { padding: 0 20px; }
  .benefits, .pricing, .integration, .faq { padding: 80px 0; }
  .cta-banner { padding: 80px 0 96px; }
  .tier-featured { transform: none; }
  .pricing-extra { padding: 18px 22px; }
}