/* Hallmark · genre: modern-minimal · macrostructure: studied-DNA hero + Workbench body (diagram · bento · spec tabs)
 * theme: studied-DNA · light + dark · nav: N1b + theme toggle · footer: Ft2 inline · enrichment: Tier A (CSS diagram, console)
 * tone: technical / enterprise · no mock data: every figure on the page is a real product fact
 * tokens.css is linked separately with its own version stamp.
 */

/* ---------- Base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html, body { overflow-x: clip; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 5rem; }
body { margin: 0; font-family: var(--font-body); font-size: var(--text-base); line-height: 1.6; color: var(--color-ink); background: var(--color-bg); -webkit-font-smoothing: antialiased; transition: background-color var(--dur-base) var(--ease-out), color var(--dur-base) var(--ease-out); }
h1, h2, h3, h4 { margin: 0; font-family: var(--font-display); font-style: normal; font-weight: 600; letter-spacing: -0.022em; line-height: 1.15; overflow-wrap: anywhere; min-width: 0; }
p { margin: 0; }
a { color: inherit; }
img, svg { display: block; max-width: 100%; }
code, pre, kbd, .mono { font-family: var(--font-mono); }
.icon { width: 1.125rem; height: 1.125rem; fill: none; stroke: currentColor; stroke-width: 1.75; stroke-linecap: round; stroke-linejoin: round; flex-shrink: 0; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
.skip { position: absolute; left: var(--space-sm); top: -4rem; z-index: 60; padding: var(--space-2xs) var(--space-sm); background: var(--color-ink); color: var(--color-bg); border-radius: var(--radius-sm); }
.skip:focus { top: var(--space-sm); }
:focus-visible { outline: 2px solid var(--color-focus); outline-offset: 2px; }
.container { width: 100%; max-width: 74rem; margin-inline: auto; padding-inline: clamp(1rem, 4vw, 2.5rem); }

/* ---------- Brand ---------- */
.brand { display: inline-flex; align-items: center; gap: var(--space-2xs); text-decoration: none; color: var(--color-ink); white-space: nowrap; }
.brand-text { display: grid; line-height: 1.1; }
.brand-name { font-weight: 700; font-size: var(--text-md); letter-spacing: -0.02em; }
.brand-by { font-size: var(--text-xs); color: var(--color-muted); }

/* ---------- Buttons ---------- */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: var(--space-2xs); min-height: 2.75rem; padding: 0 var(--space-md); border: 1px solid transparent; border-radius: var(--radius-md); font: 600 var(--text-base)/1 var(--font-body); text-decoration: none; white-space: nowrap; cursor: pointer; transition: background-color var(--dur-fast) var(--ease-out), border-color var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-out); }
.btn .icon { width: 1rem; height: 1rem; transition: transform var(--dur-base) var(--ease-out); }
.btn-primary { background: var(--color-button); color: var(--color-button-ink); }
.btn-primary:hover { background: var(--color-button-hover); }
.btn-primary:hover .icon { transform: translateX(2px); }
.btn-secondary { background: var(--color-surface); color: var(--color-ink); border-color: var(--color-rule-2); }
.btn-secondary:hover { background: var(--color-surface-3); }
.btn-light { background: var(--color-panel-ink); color: var(--color-panel); }
.btn-light:hover { background: var(--color-panel-muted); }
.btn:active { transform: translateY(1px); }
.btn[disabled] { opacity: .5; cursor: not-allowed; }
.btn-sm { min-height: 2.25rem; padding: 0 var(--space-sm); font-size: var(--text-sm); }
.text-link { color: var(--color-accent-strong); font-weight: 500; text-decoration: none; white-space: nowrap; display: inline-flex; align-items: center; gap: var(--space-3xs); }
.text-link:hover { text-decoration: underline; text-underline-offset: 3px; }
.text-link .icon { width: 0.9rem; height: 0.9rem; }

/* ---------- Chips ---------- */
.chip { display: inline-flex; align-items: center; gap: 0.35rem; padding: 0.25rem 0.65rem; border-radius: var(--radius-pill); border: 1px solid var(--color-rule); background: var(--color-surface); font-size: var(--text-xs); font-weight: 500; color: var(--color-muted); white-space: nowrap; }
.chip .icon { width: 0.85rem; height: 0.85rem; color: var(--color-accent); }
.eyebrow { display: inline-flex; align-items: center; gap: var(--space-2xs); margin-bottom: var(--space-sm); font-size: var(--text-xs); font-weight: 600; letter-spacing: .08em; text-transform: uppercase; color: var(--color-accent-strong); }
.eyebrow::before { content: ""; width: 0.45rem; height: 0.45rem; border-radius: 50%; background: var(--color-accent); box-shadow: 0 0 0 4px var(--color-accent-soft); }

/* ====================================================================
   Nav
   ==================================================================== */
.site-nav { position: sticky; top: 0; z-index: 30; background: var(--color-nav); backdrop-filter: saturate(1.4) blur(12px); -webkit-backdrop-filter: saturate(1.4) blur(12px); border-bottom: 1px solid transparent; transition: border-color var(--dur-base) var(--ease-out); }
.site-nav.is-scrolled { border-bottom-color: var(--color-rule); }
.site-nav-inner { display: flex; align-items: center; justify-content: space-between; gap: var(--space-md); min-height: 4.25rem; }
.site-links { display: none; gap: var(--space-lg); }
.site-links a { text-decoration: none; color: var(--color-muted); font-weight: 500; font-size: var(--text-sm); white-space: nowrap; transition: color var(--dur-fast) var(--ease-out); }
.site-links a:hover { color: var(--color-ink); }
.nav-actions { display: flex; align-items: center; gap: var(--space-2xs); }
@media (min-width: 56rem) { .site-links { display: flex; } }

.theme-toggle { display: inline-grid; place-items: center; width: 2.25rem; height: 2.25rem; border-radius: var(--radius-md); border: 1px solid var(--color-rule-2); background: var(--color-surface); color: var(--color-ink); cursor: pointer; transition: background-color var(--dur-fast) var(--ease-out); }
.theme-toggle:hover { background: var(--color-surface-3); }
.theme-toggle .icon { width: 1rem; height: 1rem; }
.theme-toggle .when-dark { display: none; }
:root[data-theme="dark"] .theme-toggle .when-dark { display: block; }
:root[data-theme="dark"] .theme-toggle .when-light { display: none; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-toggle .when-dark { display: block; }
  :root:not([data-theme="light"]) .theme-toggle .when-light { display: none; }
}

/* ====================================================================
   Hero
   ==================================================================== */
.hero { position: relative; isolation: isolate; padding-block: var(--space-xl) var(--space-2xl); }
.hero::before { content: ""; position: absolute; inset: 0; z-index: -1; background-image: linear-gradient(var(--color-grid) 1px, transparent 1px), linear-gradient(90deg, var(--color-grid) 1px, transparent 1px); background-size: 44px 44px; -webkit-mask-image: radial-gradient(ellipse 70% 60% at 70% 30%, #000 20%, transparent 75%); mask-image: radial-gradient(ellipse 70% 60% at 70% 30%, #000 20%, transparent 75%); }
.hero::after { content: ""; position: absolute; z-index: -1; right: 5%; top: 8%; width: min(36rem, 70vw); aspect-ratio: 1; border-radius: 50%; background: radial-gradient(closest-side, var(--color-glow), transparent); pointer-events: none; }
.hero-grid { display: grid; gap: var(--space-xl); align-items: center; }
@media (min-width: 62rem) { .hero-grid { grid-template-columns: minmax(0, 1fr) minmax(0, 1.02fr); gap: var(--space-2xl); } .hero { padding-block: var(--space-2xl) var(--space-3xl); } }
.hero h1 { font-size: var(--text-display); font-weight: 700; letter-spacing: -0.04em; line-height: 1.0; }
.hero-lede { margin-top: var(--space-md); max-width: 33rem; font-size: var(--text-md); color: var(--color-muted); }
.hero-actions { display: flex; flex-wrap: wrap; gap: var(--space-xs); margin-top: var(--space-lg); }
.hero-specs { display: flex; flex-wrap: wrap; gap: var(--space-2xs); margin-top: var(--space-lg); padding: 0; list-style: none; }
.hero-note { margin-top: var(--space-md); font-size: var(--text-sm); color: var(--color-muted); }

/* Console: the real request and the real status lifecycle */
.console { border-radius: var(--radius-lg); background: var(--color-panel); color: var(--color-panel-ink); border: 1px solid var(--color-panel-rule); box-shadow: var(--shadow-panel); overflow: hidden; min-width: 0; }
.console-head { display: flex; align-items: center; justify-content: space-between; gap: var(--space-sm); padding: var(--space-sm) var(--space-md); border-bottom: 1px solid var(--color-panel-rule); font-size: var(--text-xs); color: var(--color-panel-muted); }
.console-head b { color: var(--color-panel-ink); font-weight: 600; font-family: var(--font-mono); letter-spacing: 0; overflow-wrap: anywhere; }
.method { display: inline-block; margin-right: var(--space-2xs); padding: 0.1rem 0.4rem; border-radius: 4px; background: var(--color-panel-2); color: var(--color-panel-accent); font-family: var(--font-mono); font-size: var(--text-xs); font-weight: 600; }
.copy-btn { display: inline-flex; align-items: center; gap: 0.3rem; padding: 0.3rem 0.55rem; border-radius: var(--radius-sm); border: 1px solid var(--color-panel-rule); background: transparent; color: var(--color-panel-muted); font: 500 var(--text-xs)/1 var(--font-body); cursor: pointer; white-space: nowrap; transition: color var(--dur-fast) var(--ease-out), background-color var(--dur-fast) var(--ease-out); }
.copy-btn:hover { color: var(--color-panel-ink); background: var(--color-panel-2); }
.copy-btn .icon { width: 0.85rem; height: 0.85rem; }
.copy-btn.is-done { color: var(--color-panel-accent); }
.copy-btn[hidden] { display: none; }
.console pre { margin: 0; padding: var(--space-md); overflow-x: auto; font-size: var(--text-sm); line-height: 1.75; color: var(--color-panel-ink); }
.console .k, .spec .k { color: var(--color-panel-accent); }
.console .c, .spec .c { color: var(--color-panel-muted); }
.lifecycle { padding: var(--space-md); border-top: 1px solid var(--color-panel-rule); }
.lifecycle-title { font-size: var(--text-xs); letter-spacing: .06em; text-transform: uppercase; color: var(--color-panel-muted); }
.track { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-2xs); margin: var(--space-xs) 0 0; padding: 0; list-style: none; }
.track li { display: inline-flex; align-items: center; gap: var(--space-2xs); font-family: var(--font-mono); font-size: var(--text-xs); }
.track li + li::before { content: ""; width: 1rem; height: 1px; background: var(--color-panel-rule); }
.state { padding: 0.2rem 0.55rem; border-radius: var(--radius-pill); background: var(--color-panel-2); border: 1px solid var(--color-panel-rule); color: var(--color-panel-ink); }
.state.is-end { border-color: var(--color-panel-accent); color: var(--color-panel-accent); }
.track-note { margin-top: var(--space-xs); font-size: var(--text-xs); color: var(--color-panel-muted); }

/* ====================================================================
   Capability strip
   ==================================================================== */
.strip { border-block: 1px solid var(--color-rule); background: var(--color-surface-2); }
.strip-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--space-md); padding-block: var(--space-lg); }
@media (min-width: 56rem) { .strip-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); } }
.strip-item { display: grid; gap: var(--space-3xs); align-content: start; }
.strip-item .icon { color: var(--color-accent); margin-bottom: var(--space-3xs); }
.strip-item b { font-size: var(--text-sm); font-weight: 600; }
.strip-item span { font-size: var(--text-sm); color: var(--color-muted); }

/* ====================================================================
   Sections
   ==================================================================== */
.section { padding-block: var(--space-2xl); }
@media (min-width: 62rem) { .section { padding-block: var(--space-3xl); } }
.section.is-tinted { background: var(--color-surface-2); border-block: 1px solid var(--color-rule); }
.section-head { display: grid; gap: var(--space-sm); margin-bottom: var(--space-xl); }
@media (min-width: 62rem) { .section-head { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); align-items: end; gap: var(--space-2xl); } }
.section-head h2 { font-size: var(--text-2xl); letter-spacing: -0.03em; }
.section-head p { color: var(--color-muted); max-width: 36rem; }

.card { background: var(--color-surface); border: 1px solid var(--color-rule); border-radius: var(--radius-lg); padding: var(--space-md); min-width: 0; }

/* ---------- How it works: the message path ---------- */
.path { display: grid; gap: var(--space-sm); margin: 0; padding: 0; list-style: none; counter-reset: node; }
@media (min-width: 62rem) { .path { grid-template-columns: repeat(5, minmax(0, 1fr)); } }
.node { position: relative; counter-increment: node; display: grid; gap: var(--space-3xs); align-content: start; padding: var(--space-sm) var(--space-md); border: 1px solid var(--color-rule); border-radius: var(--radius-md); background: var(--color-surface); }
.node.is-us { border-color: var(--color-accent); box-shadow: 0 0 0 3px var(--color-accent-soft); }
.node-top { display: flex; align-items: center; justify-content: space-between; }
.node-top .icon { width: 1.25rem; height: 1.25rem; color: var(--color-accent); }
.node-top::after { content: counter(node, decimal-leading-zero); font-family: var(--font-mono); font-size: var(--text-xs); color: var(--color-faint); }
.node b { font-size: var(--text-sm); font-weight: 600; margin-top: var(--space-2xs); }
.node span { font-size: var(--text-sm); color: var(--color-muted); }
/* connectors: down on small screens, across on wide ones */
.node + .node::before { content: ""; position: absolute; left: 1.6rem; top: calc(var(--space-sm) * -1); width: 1px; height: var(--space-sm); background: var(--color-rule-2); }
@media (min-width: 62rem) { .node + .node::before { left: calc(var(--space-sm) * -1); top: 50%; width: var(--space-sm); height: 1px; } }
.return { display: flex; align-items: center; gap: var(--space-xs); margin-top: var(--space-sm); padding: var(--space-sm) var(--space-md); border: 1px dashed var(--color-rule-2); border-radius: var(--radius-md); font-size: var(--text-sm); color: var(--color-muted); }
.return .icon { color: var(--color-accent); transform: scaleX(-1); }
.return b { color: var(--color-ink); font-weight: 600; }

/* ---------- Platform bento ---------- */
.bento { display: grid; gap: var(--space-sm); }
@media (min-width: 48rem) { .bento { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (min-width: 62rem) { .bento { grid-template-columns: repeat(6, minmax(0, 1fr)); } .tile-wide { grid-column: span 3; } .tile { grid-column: span 2; } }
.tile, .tile-wide { display: grid; gap: var(--space-2xs); align-content: start; }
.tile-icon { display: grid; place-items: center; width: 2.25rem; height: 2.25rem; border-radius: var(--radius-md); background: var(--color-accent-soft); color: var(--color-accent-strong); margin-bottom: var(--space-2xs); }
.tile h3, .tile-wide h3 { font-size: var(--text-md); letter-spacing: -0.015em; }
.tile p, .tile-wide p { font-size: var(--text-sm); color: var(--color-muted); }
.tile code, .tile-wide code, .faq code, .sec-item code, .needs code { font-size: 0.85em; padding: 0.05rem 0.3rem; border-radius: 4px; background: var(--color-surface-3); color: var(--color-ink); }
.events { display: flex; flex-wrap: wrap; gap: var(--space-3xs); margin: var(--space-2xs) 0 0; padding: 0; list-style: none; }
.events li { font-family: var(--font-mono); font-size: var(--text-xs); padding: 0.2rem 0.5rem; border-radius: var(--radius-sm); border: 1px solid var(--color-rule); background: var(--color-surface-2); color: var(--color-muted); }

/* ---------- Developers: spec tabs ---------- */
.dev-grid { display: grid; gap: var(--space-lg); align-items: start; }
@media (min-width: 62rem) { .dev-grid { grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr); gap: var(--space-2xl); } }
.dev-grid h2 { font-size: var(--text-2xl); letter-spacing: -0.03em; }
.dev-grid > div > p { margin-top: var(--space-sm); color: var(--color-muted); }
.status-table { width: 100%; margin-top: var(--space-lg); border-collapse: collapse; font-size: var(--text-sm); }
.status-table caption { text-align: left; font-weight: 600; font-size: var(--text-sm); padding-bottom: var(--space-2xs); }
.status-table th, .status-table td { text-align: left; vertical-align: top; padding: var(--space-2xs) var(--space-xs) var(--space-2xs) 0; border-bottom: 1px solid var(--color-rule); }
.status-table th { font-family: var(--font-mono); font-weight: 500; font-size: var(--text-xs); white-space: nowrap; color: var(--color-ink); }
.status-table td { color: var(--color-muted); }
.status-table tr:last-child th, .status-table tr:last-child td { border-bottom: 0; }

.spec { border-radius: var(--radius-lg); background: var(--color-panel); border: 1px solid var(--color-panel-rule); color: var(--color-panel-ink); overflow: hidden; box-shadow: var(--shadow-card); min-width: 0; }
.tabs { display: flex; gap: 2px; padding: var(--space-2xs); border-bottom: 1px solid var(--color-panel-rule); overflow-x: auto; }
.tabs[hidden] { display: none; }
.tab { flex-shrink: 0; padding: 0.45rem 0.8rem; border: 0; border-radius: var(--radius-sm); background: transparent; color: var(--color-panel-muted); font: 500 var(--text-sm)/1 var(--font-body); cursor: pointer; white-space: nowrap; transition: background-color var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-out); }
.tab:hover { color: var(--color-panel-ink); }
.tab[aria-selected="true"] { background: var(--color-panel-2); color: var(--color-panel-ink); }
.tab:focus-visible { outline-color: var(--color-panel-accent); }
.panel-head { display: flex; justify-content: space-between; align-items: center; gap: var(--space-sm); padding: var(--space-sm) var(--space-md) 0; font-size: var(--text-xs); color: var(--color-panel-muted); }
.spec pre { margin: 0; padding: var(--space-sm) var(--space-md) var(--space-md); overflow-x: auto; font-size: var(--text-sm); line-height: 1.75; }
.spec [role="tabpanel"] + [role="tabpanel"] { border-top: 1px solid var(--color-panel-rule); }
.spec.is-tabbed [role="tabpanel"] + [role="tabpanel"] { border-top: 0; }
.spec [role="tabpanel"][hidden] { display: none; }

/* ---------- Security ---------- */
.sec-grid { display: grid; gap: var(--space-sm); }
@media (min-width: 48rem) { .sec-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (min-width: 62rem) { .sec-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
.sec-item { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: var(--space-xs); align-items: start; }
.sec-item .icon { margin-top: 0.15rem; color: var(--color-accent); }
.sec-item h3 { font-size: var(--text-base); }
.sec-item p { margin-top: var(--space-3xs); font-size: var(--text-sm); color: var(--color-muted); }

/* ---------- Requirements ---------- */
.needs { display: grid; gap: var(--space-md); margin: 0; padding: 0; list-style: none; }
@media (min-width: 48rem) { .needs { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (min-width: 62rem) { .needs { grid-template-columns: repeat(4, minmax(0, 1fr)); } }
.needs li { display: grid; gap: var(--space-3xs); align-content: start; }
.needs .icon { width: 1.25rem; height: 1.25rem; color: var(--color-accent); margin-bottom: var(--space-2xs); }
.needs b { font-size: var(--text-sm); font-weight: 600; }
.needs span { font-size: var(--text-sm); color: var(--color-muted); }

/* ---------- Pricing ---------- */
.price-grid { display: grid; gap: var(--space-sm); }
@media (min-width: 56rem) { .price-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
.price-card { display: grid; gap: var(--space-xs); align-content: start; }
.price-card .label { font-size: var(--text-xs); letter-spacing: .06em; text-transform: uppercase; color: var(--color-muted); }
.price-card h3 { font-size: var(--text-xl); letter-spacing: -0.03em; }
.price-card p { font-size: var(--text-sm); color: var(--color-muted); }
.price-card ul { display: grid; gap: var(--space-2xs); margin: var(--space-2xs) 0 0; padding: 0; list-style: none; }
.price-card li { display: flex; gap: var(--space-2xs); font-size: var(--text-sm); }
.price-card li .icon { width: 1rem; height: 1rem; margin-top: 0.2rem; color: var(--color-accent); }
.price-card .btn { justify-self: start; margin-top: var(--space-xs); }
.price-card.is-featured { border-color: var(--color-accent); box-shadow: 0 0 0 3px var(--color-accent-soft); }

/* ---------- FAQ ---------- */
.faq { display: grid; gap: var(--space-2xs); max-width: 52rem; }
.faq details { border: 1px solid var(--color-rule); border-radius: var(--radius-md); background: var(--color-surface); }
.faq summary { display: flex; justify-content: space-between; align-items: center; gap: var(--space-sm); padding: var(--space-sm) var(--space-md); cursor: pointer; font-weight: 600; font-size: var(--text-base); list-style: none; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: ""; width: 0.55rem; height: 0.55rem; flex-shrink: 0; border-right: 1.75px solid var(--color-muted); border-bottom: 1.75px solid var(--color-muted); transform: rotate(45deg) translate(-2px, -2px); transition: transform var(--dur-base) var(--ease-out); }
.faq details[open] summary::after { transform: rotate(225deg) translate(-2px, -2px); }
.faq details p { padding: 0 var(--space-md) var(--space-md); color: var(--color-muted); font-size: var(--text-sm); max-width: 44rem; }

/* ---------- Closing and footer ---------- */
.closing { position: relative; overflow: hidden; isolation: isolate; background: var(--color-panel); color: var(--color-panel-ink); border: 1px solid var(--color-panel-rule); border-radius: var(--radius-lg); padding: var(--space-xl) var(--space-md); display: grid; gap: var(--space-md); }
.closing::before { content: ""; position: absolute; inset: 0; z-index: -1; background-image: linear-gradient(var(--color-panel-rule) 1px, transparent 1px), linear-gradient(90deg, var(--color-panel-rule) 1px, transparent 1px); background-size: 36px 36px; opacity: .35; -webkit-mask-image: radial-gradient(ellipse 60% 90% at 85% 50%, #000, transparent 70%); mask-image: radial-gradient(ellipse 60% 90% at 85% 50%, #000, transparent 70%); }
@media (min-width: 48rem) { .closing { grid-template-columns: minmax(0, 1fr) auto; align-items: center; padding: var(--space-xl); } }
.closing h2 { font-size: var(--text-2xl); letter-spacing: -0.03em; }
.closing p { margin-top: var(--space-2xs); color: var(--color-panel-muted); max-width: 34rem; }

.site-foot { border-top: 1px solid var(--color-rule); padding-block: var(--space-lg); margin-top: var(--space-2xl); }
.site-foot-inner { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: var(--space-sm) var(--space-lg); font-size: var(--text-sm); color: var(--color-muted); }
.site-foot nav { display: flex; flex-wrap: wrap; gap: var(--space-xs) var(--space-md); }
.site-foot a { text-decoration: none; white-space: nowrap; }
.site-foot a:hover { color: var(--color-ink); }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: 120ms !important; animation: none !important; }
  .btn:active { transform: none; }
}