:root {
  --ink: #0d0d0d;
  --surface: #191a1a;
  --surface-2: #212222;
  --paper: #fafaf9;
  --signal: #ff6123;
  --warm: #facf9f;
  --blue: #7eb7ff;
  --muted: rgba(250,250,249,.62);
  --line: rgba(250,250,249,.17);
  --faint: rgba(250,250,249,.075);
  --max: 1660px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--paper);
  background:
    linear-gradient(rgba(250,250,249,.021) 1px, transparent 1px),
    linear-gradient(90deg, rgba(250,250,249,.021) 1px, transparent 1px),
    var(--ink);
  background-size: 48px 48px;
  font-family: Inter, "PingFang SC", "Microsoft YaHei", sans-serif;
}
a { color: inherit; }
button { font: inherit; }
:focus-visible { outline: 2px solid var(--signal); outline-offset: 3px; }
.shell { width: min(calc(100% - 48px), var(--max)); margin-inline: auto; }

.topbar {
  position: sticky; top: 0; z-index: 30; min-height: 76px;
  padding: 0 max(24px, calc((100vw - var(--max)) / 2));
  display: flex; align-items: center; justify-content: space-between;
  border-bottom: 1px solid var(--line); background: rgba(13,13,13,.92); backdrop-filter: blur(16px);
}
.brand { min-height: 44px; display: flex; align-items: center; gap: 13px; text-decoration: none; }
.brand-mark { position: relative; width: 20px; height: 20px; display: block; border: 1px solid var(--paper); }
.brand-mark i { position: absolute; right: -4px; bottom: -4px; width: 8px; height: 8px; background: var(--signal); }
.brand strong, .brand small { display: block; }
.brand strong { font-size: 14px; letter-spacing: .18em; }
.brand strong em { color: var(--muted); font-style: normal; font-weight: 400; }
.brand small { margin-top: 4px; color: rgba(250,250,249,.42); font-size: 7px; letter-spacing: .18em; }
.doc-meta { display: flex; align-items: center; gap: 26px; color: var(--muted); font: 600 9px/1 Space Grotesk, sans-serif; letter-spacing: .15em; }
.doc-meta a { min-width: 44px; min-height: 44px; display: inline-flex; align-items: center; justify-content: center; text-decoration: none; }
.doc-meta a:not(.top-cta):hover { color: var(--paper); }
.doc-meta .top-cta { padding: 0 16px; border: 1px solid rgba(250,250,249,.45); color: var(--paper); transition: background 180ms ease, color 180ms ease, border-color 180ms ease; }
.doc-meta .top-cta:hover { border-color: var(--paper); background: var(--paper); color: var(--ink); }

.hero { padding: 118px 0 90px; border-bottom: 1px solid var(--line); }
.eyebrow, .core-title > span, .architecture-notes span, .download > div > span { color: var(--signal); font: 600 10px/1 Space Grotesk, sans-serif; letter-spacing: .22em; }
.hero h1 { margin: 24px 0 70px; max-width: 1250px; font: 600 clamp(58px, 7.2vw, 118px)/.9 Space Grotesk, "PingFang SC", sans-serif; letter-spacing: -.064em; }
.hero-copy { display: grid; grid-template-columns: 7fr 5fr; gap: 9vw; align-items: end; }
.hero-copy > p { margin: 0; max-width: 760px; color: rgba(250,250,249,.82); font-size: clamp(19px, 1.9vw, 29px); line-height: 1.55; }
.hero-copy > div { padding-top: 18px; border-top: 2px solid var(--signal); }
.hero-copy span { color: var(--signal); font: 600 9px/1 Space Grotesk, sans-serif; letter-spacing: .17em; }
.hero-copy strong { display: block; margin-top: 20px; font-size: 19px; line-height: 1.45; }

.diagram-section, .value { padding: 112px 0; }
.section-heading { display: grid; grid-template-columns: 80px 1fr; align-items: end; margin-bottom: 46px; }
.section-heading > span { color: var(--signal); font: 600 10px/1 Space Grotesk, sans-serif; }
.section-heading > div { display: grid; grid-template-columns: 7fr 5fr; gap: 70px; align-items: end; }
.section-heading h2 { margin: 0; font: 600 clamp(36px, 4vw, 64px)/1 Space Grotesk, "PingFang SC", sans-serif; letter-spacing: -.045em; }
.section-heading p { margin: 0; color: var(--muted); line-height: 1.7; }

.architecture-card { border: 1px solid var(--line); background: rgba(13,13,13,.72); }
.diagram-header { min-height: 48px; padding: 0 18px; display: flex; align-items: center; justify-content: space-between; border-bottom: 1px solid var(--line); color: var(--muted); font: 600 8px/1 Space Grotesk, sans-serif; letter-spacing: .16em; }
.diagram-header div { color: var(--signal); }
.diagram-header i { display: inline-block; width: 7px; height: 7px; margin-right: 8px; background: var(--signal); }

.layer-row { margin: 18px; display: grid; grid-template-columns: 200px 1fr; border: 1px solid var(--line); }
.side-label { padding: 22px; display: flex; flex-direction: column; border-right: 1px solid var(--line); background: rgba(250,250,249,.035); }
.side-label > span { color: var(--signal); font: 600 9px/1 Space Grotesk, sans-serif; }
.side-label strong { margin-top: auto; font-size: 16px; }
.side-label small { margin-top: 7px; color: var(--muted); font: 500 7px/1 Space Grotesk, sans-serif; letter-spacing: .14em; }
.four-grid, .three-grid, .service-grid { display: grid; gap: 1px; background: var(--line); }
.four-grid { grid-template-columns: repeat(4, 1fr); }
.three-grid { grid-template-columns: repeat(3, 1fr); }
.service-grid { grid-template-columns: repeat(5, 1fr); }
.layer-row article { min-height: 128px; padding: 20px; background: var(--surface); }
.layer-row article > span { color: var(--signal); font: 600 8px/1 Space Grotesk, sans-serif; letter-spacing: .14em; }
.layer-row h3 { margin: 29px 0 8px; font-size: 14px; }
.layer-row p { margin: 0; color: var(--muted); font-size: 10px; line-height: 1.55; }
.access article { min-height: 110px; }
.access h3 { margin-top: 6px; }

.connector { position: relative; min-height: 62px; display: flex; align-items: center; justify-content: center; color: var(--muted); font-size: 8px; letter-spacing: .15em; text-transform: uppercase; }
.connector::before { content: ""; position: absolute; top: 0; left: 50%; width: 1px; height: 17px; background: var(--signal); }
.connector::after { content: "↓"; position: absolute; bottom: 5px; left: calc(50% - 5px); color: var(--signal); }
.connector span { padding: 7px 11px; border: 1px solid var(--faint); background: var(--ink); }
.connector.multi { justify-content: space-around; }
.connector.multi::before, .connector.multi::after { display: none; }
.connector.multi span { color: var(--warm); }

.platform-core { margin: 0 18px; border: 1px solid rgba(255,97,35,.58); }
.core-title { padding: 30px; display: grid; grid-template-columns: 3fr 6fr 3fr; align-items: end; gap: 32px; border-bottom: 1px solid rgba(255,97,35,.38); background: rgba(255,97,35,.075); }
.core-title > span { align-self: start; }
.core-title h2 { margin: 0; font: 600 clamp(26px, 3vw, 45px)/1 Space Grotesk, "PingFang SC", sans-serif; letter-spacing: -.04em; }
.core-title p { margin: 0; color: var(--muted); font-size: 11px; line-height: 1.65; }
.core-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: rgba(255,97,35,.32); }
.core-grid article { position: relative; min-height: 266px; padding: 24px; background: #1c1918; }
.core-grid article > span { position: absolute; top: 17px; right: 18px; color: rgba(255,97,35,.45); font: 600 32px/1 Space Grotesk, sans-serif; }
.core-grid h3 { margin: 64px 0 13px; font-size: 17px; }
.core-grid p { min-height: 50px; margin: 0; color: var(--muted); font-size: 11px; line-height: 1.55; }
.core-grid ul { margin: 20px 0 0; padding: 0; list-style: none; }
.core-grid li { padding: 9px 0; border-top: 1px solid var(--faint); color: rgba(250,250,249,.78); font-size: 10px; }
.core-grid li::before { content: "→"; margin-right: 8px; color: var(--signal); }
.security-rail { min-height: 64px; padding: 15px 20px; display: grid; grid-template-columns: 210px 1fr; align-items: center; gap: 24px; border-top: 1px solid rgba(126,183,255,.34); background: rgba(126,183,255,.06); }
.security-rail strong { color: var(--blue); font: 600 9px/1 Space Grotesk, sans-serif; letter-spacing: .14em; }
.security-rail div { display: grid; grid-template-columns: repeat(6, 1fr); gap: 8px; }
.security-rail span { padding: 8px; border-left: 1px solid rgba(126,183,255,.28); color: rgba(250,250,249,.74); font-size: 9px; }
.boundary-rail { padding: 18px 20px; display: grid; grid-template-columns: 210px 1fr 1fr; gap: 24px; align-items: stretch; border-top: 1px solid rgba(255,97,35,.35); background: rgba(255,97,35,.045); }
.boundary-rail > strong { padding-top: 7px; color: var(--signal); font: 600 9px/1.35 Space Grotesk, sans-serif; letter-spacing: .14em; }
.boundary-rail > div { padding-left: 16px; border-left: 1px solid rgba(255,97,35,.3); }
.boundary-rail span { color: var(--paper); font-size: 11px; font-weight: 600; }
.boundary-rail p { margin: 8px 0 0; color: var(--muted); font-size: 9px; line-height: 1.65; }

.deployment-band { margin: 64px 18px 18px; display: grid; grid-template-columns: 270px 1fr; border: 1px solid var(--line); }
.deployment-band > div:first-child { padding: 24px; display: flex; flex-direction: column; border-right: 1px solid var(--line); background: var(--surface-2); }
.deployment-band > div:first-child span { color: var(--signal); font: 600 9px/1 Space Grotesk, sans-serif; letter-spacing: .16em; }
.deployment-band > div:first-child strong { margin-top: auto; font-size: 16px; line-height: 1.4; }
.deployment-options { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); }
.deployment-options article { min-height: 144px; padding: 20px; background: var(--surface); }
.deployment-options i { color: var(--signal); font: normal 600 9px/1 Space Grotesk, sans-serif; }
.deployment-options h3 { margin: 28px 0 8px; font-size: 14px; }
.deployment-options p { margin: 0; color: var(--muted); font-size: 10px; line-height: 1.5; }

.value { border-top: 1px solid var(--line); }
.value-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--line); }
.value-grid article { min-height: 280px; padding: 30px; background: var(--surface); }
.value-grid span { color: var(--signal); font: 600 10px/1 Space Grotesk, sans-serif; }
.value-grid h3 { margin: 74px 0 17px; font-size: 20px; line-height: 1.35; }
.value-grid p { margin: 0; color: var(--muted); line-height: 1.7; }

.architecture-notes { padding: 70px 0; display: grid; grid-template-columns: 5fr 7fr; gap: 80px; border-top: 1px solid var(--line); }
.architecture-notes h2 { margin: 18px 0 0; font: 600 clamp(34px, 4vw, 60px)/1 Space Grotesk, "PingFang SC", sans-serif; letter-spacing: -.045em; }
.architecture-notes > p { margin: 0; align-self: end; color: rgba(250,250,249,.78); font-size: 18px; line-height: 1.7; }

.download { margin-top: 30px; padding: 62px 0; display: grid; grid-template-columns: 7fr 5fr; gap: 60px; align-items: end; border-top: 2px solid var(--signal); }
.download h2 { margin: 18px 0 0; font: 600 clamp(30px, 3.7vw, 54px)/1 Space Grotesk, "PingFang SC", sans-serif; letter-spacing: -.04em; }
.download-actions { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 10px; }
.download-actions a, .download-actions button { min-height: 44px; padding: 0 17px; display: inline-flex; align-items: center; justify-content: center; border: 1px solid var(--line); border-radius: 0; color: var(--muted); background: transparent; text-decoration: none; cursor: pointer; }
.download-actions a:hover, .download-actions button:hover { border-color: var(--signal); color: var(--paper); }

.footer { padding: 38px 0 46px; display: grid; grid-template-columns: 2fr 1fr 1fr auto; gap: 30px; align-items: end; border-top: 1px solid var(--line); }
.footer strong { font-size: 13px; letter-spacing: .12em; }
.footer span { color: var(--signal); font-size: 8px; letter-spacing: .14em; }
.footer p { margin: 8px 0 0; color: var(--muted); font-size: 10px; }
.footer a { min-width: 44px; min-height: 44px; display: inline-flex; align-items: center; justify-content: flex-end; color: var(--muted); font-size: 11px; text-decoration: none; }

@media (max-width: 1100px) {
  .layer-row { grid-template-columns: 150px 1fr; }
  .four-grid, .core-grid { grid-template-columns: repeat(2, 1fr); }
  .service-grid { grid-template-columns: repeat(3, 1fr); }
  .security-rail div { grid-template-columns: repeat(3, 1fr); }
  .boundary-rail { grid-template-columns: 170px 1fr 1fr; }
  .core-title { grid-template-columns: 1fr 2fr; }
  .core-title p { grid-column: 2; }
}

@media (max-width: 760px) {
  .shell { width: min(calc(100% - 28px), var(--max)); }
  .topbar { min-height: 66px; padding: 0 14px; }
  .brand small { display: none; }
  .doc-meta span { display: none; }
  .doc-meta { gap: 10px; }
  .doc-meta a:not(.top-cta) { display: none; }
  .doc-meta .top-cta { padding: 0 11px; font-size: 8px; }
  .hero { padding: 80px 0 64px; }
  .hero h1 { margin-bottom: 48px; }
  .hero-copy, .section-heading > div, .architecture-notes, .download { grid-template-columns: 1fr; gap: 30px; }
  .section-heading { grid-template-columns: 1fr; gap: 14px; }
  .diagram-section, .value { padding: 78px 0; }
  .layer-row { grid-template-columns: 1fr; margin-inline: 10px; }
  .side-label { min-height: 100px; border-right: 0; border-bottom: 1px solid var(--line); }
  .side-label strong { margin-top: 25px; }
  .four-grid, .three-grid, .service-grid, .core-grid, .deployment-options, .value-grid { grid-template-columns: 1fr; }
  .platform-core { margin-inline: 10px; }
  .core-title { grid-template-columns: 1fr; }
  .core-title p { grid-column: auto; }
  .core-grid article { min-height: 230px; }
  .security-rail { grid-template-columns: 1fr; }
  .security-rail div { grid-template-columns: repeat(2, 1fr); }
  .boundary-rail { grid-template-columns: 1fr; }
  .boundary-rail > div { padding: 12px 0 0; border-top: 1px solid rgba(255,97,35,.3); border-left: 0; }
  .connector.multi { padding: 12px; flex-direction: column; gap: 8px; }
  .deployment-band { margin-inline: 10px; grid-template-columns: 1fr; }
  .deployment-band > div:first-child { min-height: 112px; border-right: 0; border-bottom: 1px solid var(--line); }
  .architecture-notes > p { font-size: 16px; }
  .download-actions { justify-content: flex-start; }
  .footer { grid-template-columns: 1fr 1fr; }
}

@media print {
  @page { size: A3 landscape; margin: 10mm; }
  body { background: var(--ink); print-color-adjust: exact; -webkit-print-color-adjust: exact; }
  .topbar, .hero-copy, .value, .architecture-notes, .download, .footer { display: none !important; }
  .hero { padding: 20px 0 24px; }
  .hero h1 { margin: 10px 0 0; font-size: 43px; }
  .diagram-section { padding: 20px 0; }
  .section-heading { margin-bottom: 16px; }
  .architecture-card { break-inside: avoid; }
}

@media (prefers-reduced-motion: reduce) { * { scroll-behavior: auto !important; } }