:root {
  --paper: #f4f1eb;
  --ink: #17211f;
  --muted: #63706b;
  --line: rgba(23, 33, 31, .14);
  --accent: #a4773f;
  --accent-light: #d8b888;
  --forest: #173c35;
  --white: #fcfbf8;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: "Avenir Next", "PingFang SC", "Microsoft YaHei", sans-serif; -webkit-font-smoothing: antialiased; }
a { color: inherit; text-decoration: none; }
button, a { -webkit-tap-highlight-color: transparent; }
.shell { width: min(1180px, calc(100% - 48px)); margin-inline: auto; }

.nav { height: 88px; display: flex; align-items: center; justify-content: space-between; border-bottom: 1px solid var(--line); }
.brand { display: inline-flex; align-items: center; gap: 13px; }
.brand-mark { display: grid; place-items: center; width: 42px; height: 42px; border: 1px solid var(--ink); border-radius: 50%; font-family: Georgia, serif; font-size: 13px; letter-spacing: .08em; }
.brand b, .brand small { display: block; }
.brand b { font-size: 14px; letter-spacing: .08em; }
.brand small { margin-top: 3px; color: var(--muted); font-size: 8px; letter-spacing: .2em; }
.nav-links { display: flex; align-items: center; gap: 38px; font-size: 13px; }
.nav-links a { position: relative; }
.nav-links a::after { content: ""; position: absolute; left: 0; right: 100%; bottom: -8px; height: 1px; background: var(--accent); transition: right .25s ease; }
.nav-links a:hover::after { right: 0; }

.hero { min-height: 690px; display: grid; grid-template-columns: 1.08fr .92fr; align-items: center; gap: 90px; padding-block: 80px 94px; }
.kicker { display: flex; align-items: center; gap: 10px; margin: 0 0 24px; color: var(--accent); font-size: 10px; font-weight: 700; letter-spacing: .24em; }
.kicker span { width: 28px; height: 1px; background: currentColor; }
.hero h1 { margin: 0; font-family: Georgia, "Songti SC", serif; font-size: clamp(48px, 5.1vw, 76px); line-height: 1.12; font-weight: 500; letter-spacing: -.035em; }
.lead { max-width: 620px; margin: 32px 0 0; color: var(--muted); font-size: 17px; line-height: 1.9; }
.hero-actions { display: flex; align-items: center; gap: 28px; margin-top: 42px; }
.primary-button, .download-button { display: inline-flex; align-items: center; justify-content: space-between; gap: 32px; color: var(--white); background: var(--forest); transition: transform .25s ease, background .25s ease; }
.primary-button { min-width: 230px; padding: 16px 20px; border-radius: 2px; font-size: 13px; }
.primary-button:hover, .download-button:hover { transform: translateY(-2px); background: #205047; }
.arrow { font-size: 18px; font-weight: 400; }
.text-button { display: inline-flex; align-items: center; gap: 10px; padding-block: 14px; border-bottom: 1px solid var(--ink); font-size: 13px; }

.network-card { position: relative; padding: 24px; border: 1px solid var(--line); background: rgba(252,251,248,.62); box-shadow: 0 24px 70px rgba(35,43,40,.07); }
.network-card::before { content: ""; position: absolute; inset: 8px; border: 1px solid rgba(164,119,63,.16); pointer-events: none; }
.network-head { position: relative; display: flex; align-items: center; justify-content: space-between; padding: 4px 4px 22px; border-bottom: 1px solid var(--line); font-size: 9px; letter-spacing: .2em; }
.network-head i { display: flex; align-items: center; gap: 7px; color: #426e62; font-style: normal; }
.network-head i::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: #58a28d; box-shadow: 0 0 0 4px rgba(88,162,141,.12); }
.server-node { position: relative; width: 72%; margin: 38px auto 24px; padding: 22px; border: 1px solid var(--forest); text-align: center; background: var(--white); }
.node-label { position: absolute; top: -9px; left: 12px; padding: 2px 8px; color: var(--white); background: var(--forest); font-size: 8px; letter-spacing: .18em; }
.server-node b, .server-node small { display: block; }
.server-node b { font-family: Georgia, "Songti SC", serif; font-size: 20px; font-weight: 500; }
.server-node small { margin-top: 6px; color: var(--muted); font-size: 10px; }
.connection { display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 9px; color: var(--muted); font-size: 9px; text-align: center; }
.connection span { height: 1px; background: var(--line); }
.connection em { font-style: normal; }
.client-row { display: grid; grid-template-columns: repeat(3,1fr); gap: 10px; margin-top: 18px; }
.client-row div { padding: 16px 8px; border: 1px solid var(--line); text-align: center; }
.client-row b, .client-row span { display: block; }
.client-row b { color: var(--accent); font-family: Georgia, serif; font-size: 17px; font-weight: 400; }
.client-row span { margin-top: 5px; font-size: 10px; }
.network-card > p { margin: 22px 2px 4px; color: var(--muted); font-size: 10px; text-align: center; }

.products-section { padding: 100px 0 110px; background: var(--white); border-block: 1px solid rgba(23,33,31,.08); }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 60px; margin-bottom: 46px; }
.section-heading h2, .requirements h2 { margin: 0; font-family: Georgia, "Songti SC", serif; font-size: clamp(36px, 4vw, 54px); line-height: 1.18; font-weight: 500; letter-spacing: -.025em; }
.section-heading > p { max-width: 470px; margin: 0; color: var(--muted); font-size: 14px; line-height: 1.8; }
.section-heading .kicker { margin-bottom: 16px; }
.product-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.product-card { position: relative; min-height: 520px; padding: 34px; border: 1px solid var(--line); background: var(--paper); transition: transform .25s ease, box-shadow .25s ease; }
.product-card:hover { transform: translateY(-4px); box-shadow: 0 26px 70px rgba(35,43,40,.09); }
.product-top { display: flex; align-items: center; justify-content: space-between; }
.product-index { color: var(--accent); font-family: Georgia, serif; font-size: 26px; }
.version { padding: 7px 10px; border: 1px solid var(--line); font-size: 9px; letter-spacing: .12em; }
.product-eyebrow { margin: 70px 0 12px; color: var(--accent); font-size: 9px; letter-spacing: .22em; }
.product-card h3 { margin: 0; font-family: Georgia, "Songti SC", serif; font-size: 32px; font-weight: 500; }
.product-description { min-height: 78px; margin: 20px 0 0; color: var(--muted); font-size: 14px; line-height: 1.85; }
.product-meta { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 22px; }
.product-meta span { padding: 6px 10px; color: #52625d; background: rgba(255,255,255,.65); font-size: 9px; }
.product-card dl { display: grid; grid-template-columns: repeat(3,1fr); margin: 26px 0 0; padding: 18px 0; border-block: 1px solid var(--line); }
.product-card dl div + div { padding-left: 16px; border-left: 1px solid var(--line); }
.product-card dt { color: var(--muted); font-size: 9px; }
.product-card dd { margin: 6px 0 0; font-size: 12px; }
.download-button { width: 100%; margin-top: 24px; padding: 16px 18px; font-size: 13px; }

.deployment { padding-block: 110px; }
.section-heading.compact { align-items: end; }
.mode-list { border-top: 1px solid var(--line); }
.mode-list article { display: grid; grid-template-columns: 80px 1fr 220px; align-items: center; gap: 30px; min-height: 154px; border-bottom: 1px solid var(--line); }
.mode-code { color: var(--accent); font-family: Georgia, serif; font-size: 24px; }
.mode-list h3 { margin: 0 0 9px; font-family: Georgia, "Songti SC", serif; font-size: 24px; font-weight: 500; }
.mode-list p { max-width: 620px; margin: 0; color: var(--muted); font-size: 13px; line-height: 1.8; }
.mode-address { padding-left: 30px; border-left: 1px solid var(--line); }
.mode-address small, .mode-address b { display: block; }
.mode-address small { color: var(--muted); font-size: 9px; }
.mode-address b { margin-top: 8px; font-family: "SFMono-Regular", Consolas, monospace; font-size: 14px; font-weight: 500; }
.separation-note { display: grid; grid-template-columns: 140px 1fr; gap: 34px; margin-top: 48px; padding: 28px 32px; color: #dce7e3; background: var(--forest); }
.separation-note span { color: var(--accent-light); font-size: 10px; letter-spacing: .16em; }
.separation-note p { margin: 0; font-size: 13px; line-height: 1.9; }
.separation-note b { color: #fff; }

.requirements { padding: 110px 0; color: var(--white); background: #18211f; }
.requirement-grid { display: grid; grid-template-columns: .8fr 1.2fr; gap: 100px; }
.kicker.light { color: var(--accent-light); }
.requirements ol { margin: 0; padding: 0; list-style: none; border-top: 1px solid rgba(255,255,255,.15); }
.requirements li { display: grid; grid-template-columns: 62px 1fr; gap: 20px; padding: 24px 0; border-bottom: 1px solid rgba(255,255,255,.15); }
.requirements li > span { color: var(--accent-light); font-family: Georgia, serif; }
.requirements li b { font-size: 14px; }
.requirements li p { margin: 7px 0 0; color: #9facaa; font-size: 12px; line-height: 1.7; }

.footer { min-height: 150px; display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 24px; }
.footer p { color: var(--muted); font-size: 10px; letter-spacing: .08em; text-align: center; }
.footer > a { justify-self: end; padding-bottom: 5px; border-bottom: 1px solid var(--line); font-size: 11px; }

@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; gap: 54px; }
  .network-card { max-width: 620px; }
  .section-heading { align-items: flex-start; flex-direction: column; gap: 20px; }
  .mode-list article { grid-template-columns: 54px 1fr; padding: 28px 0; }
  .mode-address { grid-column: 2; padding: 0; border: 0; }
  .requirement-grid { grid-template-columns: 1fr; gap: 50px; }
}

@media (max-width: 680px) {
  .shell { width: min(100% - 30px, 1180px); }
  .nav { height: 76px; }
  .nav-links { display: none; }
  .hero { min-height: auto; padding-block: 62px 74px; }
  .hero h1 { font-size: 43px; }
  .lead { font-size: 15px; }
  .hero-actions { align-items: flex-start; flex-direction: column; gap: 14px; }
  .primary-button { width: 100%; }
  .network-card { padding: 18px; }
  .server-node { width: 88%; }
  .client-row { gap: 6px; }
  .products-section, .deployment, .requirements { padding-block: 76px; }
  .product-grid { grid-template-columns: 1fr; }
  .product-card { min-height: auto; padding: 26px; }
  .product-eyebrow { margin-top: 48px; }
  .product-card dl { grid-template-columns: 1fr; gap: 12px; }
  .product-card dl div + div { padding: 12px 0 0; border-top: 1px solid var(--line); border-left: 0; }
  .mode-list article { grid-template-columns: 38px 1fr; gap: 14px; }
  .separation-note { grid-template-columns: 1fr; gap: 12px; padding: 24px; }
  .footer { grid-template-columns: 1fr; padding-block: 40px; text-align: left; }
  .footer p { text-align: left; }
  .footer > a { justify-self: start; }
}

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