:root {
  --bg: #f6f7fb;
  --bg-2: #eef0f7;
  --card: rgba(255, 255, 255, 0.78);
  --card-solid: #ffffff;
  --line: rgba(15, 23, 42, 0.09);
  --text: #0f172a;
  --muted: #5b6475;
  --accent: #5b5bf6;
  --accent-2: #0ea5e9;
  --ok: #12a150;
  --ok-bg: rgba(18, 161, 80, 0.12);
  --bad: #d92d20;
  --bad-bg: rgba(217, 45, 32, 0.12);
  --warn: #c27803;
  --warn-bg: rgba(194, 120, 3, 0.14);
  --glow: rgba(91, 91, 246, 0.35);
  --shadow: 0 1px 2px rgba(15, 23, 42, 0.04), 0 8px 24px rgba(15, 23, 42, 0.06);
  --radius: 22px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, monospace;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0b0d14;
    --bg-2: #11141e;
    --card: rgba(22, 26, 38, 0.72);
    --card-solid: #161a26;
    --line: rgba(255, 255, 255, 0.08);
    --text: #e8ebf3;
    --muted: #9099ad;
    --accent: #8b8cff;
    --accent-2: #38bdf8;
    --ok: #3ddc84;
    --ok-bg: rgba(61, 220, 132, 0.12);
    --bad: #ff6b5e;
    --bad-bg: rgba(255, 107, 94, 0.14);
    --warn: #f5b84a;
    --warn-bg: rgba(245, 184, 74, 0.14);
    --glow: rgba(139, 140, 255, 0.45);
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 12px 32px rgba(0, 0, 0, 0.35);
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --bg: #0b0d14;
  --bg-2: #11141e;
  --card: rgba(22, 26, 38, 0.72);
  --card-solid: #161a26;
  --line: rgba(255, 255, 255, 0.08);
  --text: #e8ebf3;
  --muted: #9099ad;
  --accent: #8b8cff;
  --accent-2: #38bdf8;
  --ok: #3ddc84;
  --ok-bg: rgba(61, 220, 132, 0.12);
  --bad: #ff6b5e;
  --bad-bg: rgba(255, 107, 94, 0.14);
  --warn: #f5b84a;
  --warn-bg: rgba(245, 184, 74, 0.14);
  --glow: rgba(139, 140, 255, 0.45);
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 12px 32px rgba(0, 0, 0, 0.35);
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* Soft colour wash and a faint grid behind everything */
.bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(60rem 30rem at 10% -10%, color-mix(in srgb, var(--accent) 22%, transparent), transparent 60%),
    radial-gradient(50rem 26rem at 95% 0%, color-mix(in srgb, var(--accent-2) 18%, transparent), transparent 60%),
    linear-gradient(var(--bg), var(--bg-2));
}
.bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse at 50% 0%, #000 0%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at 50% 0%, #000 0%, transparent 70%);
  opacity: 0.6;
}

.wrap {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding-left: max(16px, env(safe-area-inset-left));
  padding-right: max(16px, env(safe-area-inset-right));
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 8px; }

.mono { font-family: var(--mono); font-feature-settings: "zero" 1; }
.small { font-size: 13px; }
.muted { color: var(--muted); }

/* Top bar */
.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-top: 20px;
  padding-bottom: 8px;
}
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--text); font-weight: 650; letter-spacing: -0.01em; }
.brand:hover { text-decoration: none; }
.top-right { display: flex; align-items: center; gap: 10px; }

.pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  border: 1px solid var(--line);
  background: var(--card);
  backdrop-filter: blur(10px);
  white-space: nowrap;
}
.pill .dot { width: 8px; height: 8px; border-radius: 50%; background: currentColor; position: relative; }
.pill.ok { color: var(--ok); }
.pill.warn { color: var(--warn); }
.pill.ok .dot::after {
  content: "";
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  border: 2px solid currentColor;
  animation: ping 2s ease-out infinite;
}

.icon-btn {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--text);
  cursor: pointer;
}
.icon-btn svg { width: 18px; height: 18px; fill: currentColor; }

/* Hero */
.hero { padding: 48px 0 16px; }
.eyebrow {
  margin: 0 0 12px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
}
h1 {
  margin: 0;
  font-size: clamp(32px, 6vw, 60px);
  line-height: 1.05;
  letter-spacing: -0.035em;
  font-weight: 750;
  max-width: 16ch;
  background: linear-gradient(120deg, var(--text) 30%, var(--accent) 75%, var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.lede { margin: 18px 0 32px; max-width: 62ch; font-size: clamp(16px, 2.2vw, 19px); color: var(--muted); }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.served {
  display: grid;
  grid-template-columns: 1fr auto auto;
  align-items: center;
  gap: 24px;
  padding: 22px 24px;
}
.served-main { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 12px; min-width: 0; }
.served-main .label { width: 100%; font-size: 13px; color: var(--muted); }
.served-main strong { font-size: clamp(18px, 3vw, 24px); font-weight: 650; overflow-wrap: anywhere; }
.az-tag {
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 14%, transparent);
}
.served-meta { display: flex; gap: 28px; margin: 0; }
.served-meta div { min-width: 0; }
.served-meta dt { font-size: 12px; color: var(--muted); }
.served-meta dd { margin: 2px 0 0; font-size: 14px; white-space: nowrap; }

.flash { animation: flash 0.6s ease; }

/* Sections rise in once as they scroll into view (only when JS is running) */
.js .reveal { opacity: 0; transform: translateY(18px); transition: opacity 0.8s var(--ease), transform 0.8s var(--ease); }
.js .reveal.in { opacity: 1; transform: none; }
.hero > * { animation: rise 0.9s var(--ease) both; }
.hero > :nth-child(2) { animation-delay: 0.06s; }
.hero > :nth-child(3) { animation-delay: 0.12s; }
.hero > :nth-child(4) { animation-delay: 0.18s; }

/* Buttons */
.btn {
  appearance: none;
  border: 0;
  border-radius: 999px;
  padding: 11px 18px;
  font: inherit;
  font-size: 15px;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 6px 18px -6px var(--glow);
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, opacity 0.15s;
  white-space: nowrap;
}
.btn:hover { transform: translateY(-1px); box-shadow: 0 10px 24px -8px var(--glow); }
.btn:active { transform: translateY(0); }
.btn:disabled { opacity: 0.6; cursor: progress; transform: none; }
.btn.ghost { color: var(--text); background: transparent; border: 1px solid var(--line); box-shadow: none; }
.btn.ghost:hover { background: var(--card-solid); }

/* Sections */
section { padding: 40px 0 0; }
.section-head { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 4px 16px; margin-bottom: 16px; }
h2 { margin: 0; font-size: clamp(20px, 3vw, 26px); letter-spacing: -0.02em; }
.section-head p { margin: 0; color: var(--muted); font-size: 15px; }

/* Request path */
.flow {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) 36px minmax(0, 1.2fr) 36px minmax(0, 1.3fr) 36px minmax(0, 1.2fr);
  align-items: center;
  padding: 24px;
}
.node {
  --radius: 14px;
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 14px 16px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--card-solid);
  min-width: 0;
  transition: border-color 0.3s, box-shadow 0.3s, transform 0.3s;
}
.node.edge { text-align: center; }
.n-kicker { font-size: 11px; font-weight: 600; letter-spacing: 0.06em; text-transform: uppercase; color: var(--muted); }
.n-title { font-weight: 650; line-height: 1.3; overflow-wrap: anywhere; }
.n-sub { font-size: 13px; color: var(--muted); overflow-wrap: anywhere; }
.azs, .data { display: grid; gap: 12px; }
.inst.live {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 16%, transparent), 0 10px 30px -10px var(--glow);
}
.inst.live .n-kicker::after { content: " \00b7  serving you"; color: var(--accent); }
.inst.seen .inst-id { color: var(--text); }

/* Animated connector: a dot travels along each link */
.link { position: relative; height: 2px; background: linear-gradient(90deg, var(--line), color-mix(in srgb, var(--accent) 40%, var(--line)), var(--line)); }
.link::after {
  content: "";
  position: absolute;
  top: -3px;
  left: 0;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 10px var(--glow);
  animation: travel-x 1.8s linear infinite;
}

/* Checks */
.grid { display: grid; gap: 16px; }
.checks { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.check { padding: 20px; display: flex; flex-direction: column; gap: 8px; transition: transform 0.4s var(--ease), box-shadow 0.4s var(--ease); }
.check:hover { transform: translateY(-3px); box-shadow: var(--shadow), 0 18px 40px -20px var(--glow); }
.check header { display: flex; align-items: center; gap: 10px; }
.check h3 { margin: 0; font-size: 16px; }
.check p { margin: 0; color: var(--muted); font-size: 14px; flex: 1; }
.check .mono { color: var(--muted); overflow-wrap: anywhere; }
.badge { font-size: 11px; font-weight: 700; letter-spacing: 0.04em; padding: 2px 8px; border-radius: 999px; }
.check.ok .badge { color: var(--ok); background: var(--ok-bg); }
.check.bad .badge { color: var(--bad); background: var(--bad-bg); }
.check.ok { border-top: 2px solid color-mix(in srgb, var(--ok) 55%, transparent); }
.check.bad { border-top: 2px solid color-mix(in srgb, var(--bad) 55%, transparent); }

/* Load balancing */
.lb, .visits { padding: 20px 24px 24px; }
.lb-controls { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 16px; margin-bottom: 18px; }
.bars { display: grid; gap: 12px; }
.bar-row { display: grid; grid-template-columns: minmax(0, 220px) minmax(0, 1fr) 84px; align-items: center; gap: 14px; }
.bar-label { min-width: 0; }
.bar-label b { display: block; font-size: 14px; }
.bar-label span { display: block; font-size: 12px; color: var(--muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.bar-track { height: 12px; border-radius: 999px; background: var(--bg-2); overflow: hidden; border: 1px solid var(--line); }
.bar-fill { height: 100%; width: 0; border-radius: inherit; background: linear-gradient(90deg, var(--accent), var(--accent-2)); transition: width 0.6s var(--ease); }
.bar-row.alt .bar-fill { background: linear-gradient(90deg, var(--accent-2), var(--ok)); }
.bar-num { text-align: right; font-family: var(--mono); font-size: 13px; color: var(--muted); }
.ticks { display: flex; flex-wrap: wrap; gap: 4px; margin-top: 16px; min-height: 10px; }
.tick { width: 10px; height: 10px; border-radius: 3px; background: var(--accent); animation: pop 0.3s var(--ease); }
.tick.b { background: var(--accent-2); }
.tick.x { background: var(--bad); }
.empty { color: var(--muted); font-size: 14px; margin: 0; }

.visits { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 24px; align-items: center; }
.big { display: flex; flex-direction: column; }
.big .mono { font-size: clamp(32px, 6vw, 48px); font-weight: 700; letter-spacing: -0.03em; line-height: 1; }

/* Chips */
.chips { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 10px; }
.chips li {
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--card);
  font-size: 14px;
  backdrop-filter: blur(10px);
}
.chips li::before { content: ""; display: inline-block; width: 6px; height: 6px; margin: 0 8px 2px 0; border-radius: 50%; background: var(--ok); }

.foot {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px 16px;
  margin-top: 56px;
  padding-top: 24px;
  padding-bottom: max(32px, env(safe-area-inset-bottom));
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

@keyframes ping { 0% { transform: scale(0.6); opacity: 0.9; } 100% { transform: scale(1.8); opacity: 0; } }
@keyframes travel-x { from { left: 0; } to { left: calc(100% - 8px); } }
@keyframes travel-y { from { top: 0; } to { top: calc(100% - 8px); } }
@keyframes pop { from { transform: scale(0); } to { transform: scale(1); } }
@keyframes rise { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }
@keyframes flash { 0% { box-shadow: 0 0 0 0 var(--glow); } 100% { box-shadow: var(--shadow); } }

/* Tablet: checks two per row, request path stacks */
@media (max-width: 960px) {
  .checks { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .flow { grid-template-columns: minmax(0, 1fr); gap: 0; }
  .link { width: 2px; height: 28px; margin: 0 auto; background: linear-gradient(var(--line), color-mix(in srgb, var(--accent) 40%, var(--line)), var(--line)); }
  .link::after { left: -3px; top: 0; animation-name: travel-y; }
  .azs, .data { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .node.edge { justify-self: center; min-width: 200px; }
}

@media (max-width: 720px) {
  .served { grid-template-columns: minmax(0, 1fr); gap: 18px; }
  .served-meta { flex-wrap: wrap; gap: 14px 24px; }
  .served .btn { justify-self: start; }
  .bar-row { grid-template-columns: minmax(0, 1fr) 64px; }
  .bar-label { grid-column: 1 / -1; }
  .visits { grid-template-columns: minmax(0, 1fr); }
}

/* Phone */
@media (max-width: 520px) {
  .hero { padding-top: 32px; }
  .checks, .azs, .data { grid-template-columns: minmax(0, 1fr); }
  .flow, .lb, .visits { padding: 16px; }
  .pill span:last-child { display: none; }
  .pill { padding: 8px; }
  .lb-controls .btn { width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}