/* ============================================================
   AI Security Gateway — promotional site
   Fully static, no build step. Dark-first with a light theme.
   Brand: blue (#2563eb / #1e40af) + maroon-red (#9f1239 / #dc2626)
   ============================================================ */

/* ---------- Tokens ---------- */
:root {
  /* brand */
  --blue: #3b82f6;
  --blue-600: #2563eb;
  --blue-700: #1e40af;
  --blue-glow: #60a5fa;
  --red: #e11d48;
  --maroon: #9f1239;
  --danger: #dc2626;
  --warn: #ea580c;
  --ok: #16a34a;

  --grad: linear-gradient(120deg, #60a5fa 0%, #2563eb 42%, #9f1239 100%);
  --grad-soft: linear-gradient(120deg, rgba(37,99,235,.18), rgba(159,18,57,.18));

  /* dark theme (default) */
  --bg: #0a0e1a;
  --bg-2: #0d1322;
  --surface: #111a2e;
  --surface-2: #16203a;
  --surface-3: #1b274480;
  --border: rgba(148, 163, 184, .12);
  --border-2: rgba(148, 163, 184, .2);
  --text: #e6edf7;
  --text-2: #9fb0c7;
  --text-3: #6b7e98;
  --heading: #f6f9ff;
  --code-bg: #0b1120;
  --shadow: 0 24px 60px -20px rgba(0, 0, 0, .7);
  --shadow-blue: 0 20px 60px -18px rgba(37, 99, 235, .5);
  --ring: rgba(96, 165, 250, .45);

  --maxw: 1180px;
  --r-sm: 10px;
  --r: 16px;
  --r-lg: 22px;
  --r-xl: 28px;
  --t: .25s cubic-bezier(.4, 0, .2, 1);
  --t-slow: .55s cubic-bezier(.4, 0, .2, 1);

  --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: "SF Mono", ui-monospace, "JetBrains Mono", Menlo, Monaco, Consolas, "Liberation Mono", monospace;
}

[data-theme="light"] {
  --bg: #f7f9fc;
  --bg-2: #eef2f8;
  --surface: #ffffff;
  --surface-2: #ffffff;
  --surface-3: #f1f5f9;
  --border: rgba(15, 23, 42, .1);
  --border-2: rgba(15, 23, 42, .16);
  --text: #1e293b;
  --text-2: #51607a;
  --text-3: #8190a8;
  --heading: #0b1324;
  --code-bg: #0b1120;            /* keep code dark in both themes */
  --shadow: 0 18px 50px -22px rgba(15, 23, 42, .35);
  --shadow-blue: 0 18px 50px -18px rgba(37, 99, 235, .35);
  --ring: rgba(37, 99, 235, .35);
}

/* ---------- Reset / base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
  transition: background var(--t), color var(--t);
}

h1, h2, h3, h4 { color: var(--heading); line-height: 1.15; margin: 0; letter-spacing: -.02em; font-weight: 700; }
p { margin: 0; }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
code { font-family: var(--mono); font-size: .9em; }
ul, ol { margin: 0; padding: 0; list-style: none; }
button { font-family: inherit; cursor: pointer; }

::selection { background: rgba(37, 99, 235, .35); color: #fff; }

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

.skip-link {
  position: absolute; left: -999px; top: 0; z-index: 200;
  background: var(--blue-600); color: #fff; padding: 10px 16px; border-radius: 0 0 var(--r-sm) 0;
}
.skip-link:focus { left: 0; }

:focus-visible { outline: 2px solid var(--ring); outline-offset: 3px; border-radius: 6px; }

.grad-text {
  background: var(--grad);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
}

/* ---------- Reveal animation ---------- */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity var(--t-slow), transform var(--t-slow); }
.reveal.is-in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1 !important; transform: none !important; }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 9px;
  font-weight: 600; font-size: 15px; line-height: 1;
  padding: 12px 20px; border-radius: 999px; border: 1px solid transparent;
  transition: transform var(--t), box-shadow var(--t), background var(--t), border-color var(--t), color var(--t);
  white-space: nowrap; cursor: pointer; color: var(--text);
}
.btn svg { flex: 0 0 auto; }
.btn--sm { padding: 9px 15px; font-size: 14px; }
.btn--lg { padding: 15px 26px; font-size: 16px; }
.btn--block { width: 100%; }

.btn--primary {
  background: var(--blue-600); color: #fff; border-color: transparent;
  box-shadow: var(--shadow-blue);
}
.btn--primary:hover { background: var(--blue-700); transform: translateY(-2px); }
.btn--primary:active { transform: translateY(0); }

.btn--ghost {
  background: var(--surface-3);
  border-color: var(--border-2);
  color: var(--text);
  backdrop-filter: blur(8px);
}
.btn--ghost:hover { border-color: var(--blue); color: var(--heading); transform: translateY(-2px); background: var(--surface-2); }

/* ---------- Topbar ---------- */
.topbar {
  display: flex; align-items: center; justify-content: center; gap: 10px;
  flex-wrap: wrap;
  background: linear-gradient(90deg, rgba(37,99,235,.16), rgba(159,18,57,.16));
  border-bottom: 1px solid var(--border);
  font-size: 13px; color: var(--text-2);
  padding: 8px 16px; text-align: center;
}
.topbar strong { color: var(--heading); }
.topbar__dot { width: 7px; height: 7px; border-radius: 50%; background: var(--ok); box-shadow: 0 0 0 0 rgba(22,163,74,.6); animation: pulse 2.4s infinite; }
.topbar__link { color: var(--blue); font-weight: 600; }
.topbar__link:hover { text-decoration: underline; }

@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(22,163,74,.55); }
  70% { box-shadow: 0 0 0 7px rgba(22,163,74,0); }
  100% { box-shadow: 0 0 0 0 rgba(22,163,74,0); }
}

/* ---------- Nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  backdrop-filter: blur(14px) saturate(140%);
  border-bottom: 1px solid transparent;
  transition: border-color var(--t), background var(--t);
}
.nav.is-scrolled { border-bottom-color: var(--border); background: color-mix(in srgb, var(--bg) 88%, transparent); }
.nav__inner { display: flex; align-items: center; justify-content: space-between; height: 66px; gap: 18px; }

.brand { display: inline-flex; align-items: center; gap: 11px; font-weight: 700; color: var(--heading); }
.brand__logo { border-radius: 8px; }
.brand__name { font-size: 16px; letter-spacing: -.01em; }

.nav__links { display: flex; align-items: center; gap: 6px; }
.nav__links a {
  font-size: 14.5px; color: var(--text-2); font-weight: 500;
  padding: 8px 13px; border-radius: 9px; transition: color var(--t), background var(--t);
}
.nav__links a:hover { color: var(--heading); background: var(--surface-3); }

.nav__actions { display: flex; align-items: center; gap: 10px; }

.icon-btn {
  display: inline-grid; place-items: center;
  width: 40px; height: 40px; border-radius: 11px;
  background: var(--surface-3); border: 1px solid var(--border-2); color: var(--text-2);
  transition: color var(--t), border-color var(--t), background var(--t);
}
.icon-btn:hover { color: var(--heading); border-color: var(--blue); }

.icon-sun { display: none; }
[data-theme="light"] .icon-sun { display: block; }
[data-theme="light"] .icon-moon { display: none; }

.nav__burger { display: none; }
.nav__github { display: inline-flex; }

/* ---------- Mobile menu ---------- */
.mobile-menu {
  display: flex; flex-direction: column; gap: 4px;
  padding: 12px 24px 22px;
  border-bottom: 1px solid var(--border);
  background: var(--bg);
}
.mobile-menu[hidden] { display: none; }
.mobile-menu a:not(.btn) { padding: 12px 6px; color: var(--text); font-weight: 500; border-bottom: 1px solid var(--border); }
.mobile-menu .btn { margin-top: 12px; }

/* ---------- Hero ---------- */
.hero { position: relative; padding: clamp(48px, 8vw, 96px) 0 clamp(40px, 6vw, 80px); overflow: hidden; }
.hero__bg { position: absolute; inset: 0; z-index: 0; pointer-events: none; }
.hero__grid {
  position: absolute; inset: -2px;
  background-image:
    linear-gradient(to right, var(--border) 1px, transparent 1px),
    linear-gradient(to bottom, var(--border) 1px, transparent 1px);
  background-size: 54px 54px;
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 30%, transparent 75%);
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 30%, transparent 75%);
  opacity: .6;
}
.hero__glow { position: absolute; border-radius: 50%; filter: blur(90px); opacity: .5; }
.hero__glow--blue { width: 520px; height: 520px; background: radial-gradient(circle, rgba(37,99,235,.55), transparent 65%); top: -160px; left: -120px; }
.hero__glow--red { width: 460px; height: 460px; background: radial-gradient(circle, rgba(159,18,57,.4), transparent 65%); top: -60px; right: -120px; }
[data-theme="light"] .hero__glow { opacity: .28; }

.hero__inner {
  position: relative; z-index: 1;
  display: grid; grid-template-columns: 1.05fr .95fr; gap: clamp(24px, 4vw, 56px); align-items: center;
}

.eyebrow {
  display: inline-flex; align-items: center; gap: 9px;
  font-size: 13px; font-weight: 600; color: var(--text-2);
  background: var(--surface-3); border: 1px solid var(--border-2);
  padding: 7px 14px; border-radius: 999px; margin-bottom: 22px;
}
.eyebrow__pulse { width: 8px; height: 8px; border-radius: 50%; background: var(--blue); box-shadow: 0 0 0 0 var(--blue); animation: pulse 2.2s infinite; }

.hero__title { font-size: clamp(38px, 6vw, 62px); font-weight: 800; letter-spacing: -.035em; }
.hero__lede { margin-top: 22px; font-size: clamp(16px, 1.5vw, 19px); color: var(--text-2); max-width: 560px; }
.hero__lede strong { color: var(--text); font-weight: 600; }

.hero__cta { margin-top: 32px; display: flex; flex-wrap: wrap; gap: 14px; }
.hero__meta { margin-top: 28px; display: flex; flex-wrap: wrap; gap: 20px; }
.hero__meta li { display: inline-flex; align-items: center; gap: 7px; font-size: 14px; color: var(--text-2); }
.hero__meta svg { color: var(--ok); }

/* ---------- Hero gateway visual ---------- */
.hero__visual { position: relative; }
.gw {
  position: relative;
  background: linear-gradient(165deg, var(--surface-2), var(--surface));
  border: 1px solid var(--border-2);
  border-radius: var(--r-xl);
  padding: 18px;
  box-shadow: var(--shadow);
}
.gw::before {
  content: ""; position: absolute; inset: 0; border-radius: var(--r-xl); padding: 1px;
  background: var(--grad); -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor; mask-composite: exclude; opacity: .5; pointer-events: none;
}
.gw__svg { width: 100%; height: auto; display: block; }

.gw__wire { stroke: var(--border-2); stroke-width: 2; fill: none; }
.gw__wire--danger { stroke: rgba(220,38,38,.35); }

.gw__packet { fill: var(--blue-glow); filter: drop-shadow(0 0 5px rgba(96,165,250,.9)); }
.gw__packet--out { fill: #34d399; filter: drop-shadow(0 0 5px rgba(52,211,153,.9)); }
.gw__packet--danger { fill: var(--danger); filter: drop-shadow(0 0 6px rgba(220,38,38,.95)); }

.gw__node rect { fill: var(--surface-3); stroke: var(--border-2); stroke-width: 1.5; }
.gw__node text { fill: var(--text); font: 600 12px var(--font); text-anchor: middle; }
.gw__node--svc rect { fill: rgba(37,99,235,.12); stroke: rgba(96,165,250,.4); }

.gw__shield .gw__check { animation: dash 2.6s ease-in-out infinite; }
.gw__label { fill: var(--text-2); font: 600 13px var(--font); text-anchor: middle; }

@keyframes dash {
  0%, 18% { stroke-dasharray: 0 60; }
  45%, 100% { stroke-dasharray: 60 0; }
}

.gw__chip {
  position: absolute; display: inline-flex; align-items: center; gap: 8px;
  font-size: 12.5px; font-weight: 600; color: var(--text);
  background: color-mix(in srgb, var(--surface) 88%, transparent);
  backdrop-filter: blur(8px);
  border: 1px solid var(--border-2); border-radius: 999px; padding: 8px 13px;
  box-shadow: var(--shadow); white-space: nowrap;
  animation: float 5s ease-in-out infinite;
}
.gw__chip--ok { top: 6%; right: -6%; }
.gw__chip--block { bottom: 24%; left: -9%; animation-delay: 1.1s; }
.gw__chip--cost { bottom: 2%; right: 2%; animation-delay: 2.2s; }
.dot { width: 8px; height: 8px; border-radius: 50%; }
.dot--ok { background: var(--ok); box-shadow: 0 0 8px var(--ok); }
.dot--block { background: var(--danger); box-shadow: 0 0 8px var(--danger); }
.dot--cost { background: var(--warn); box-shadow: 0 0 8px var(--warn); }

@keyframes float { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-8px); } }
@media (prefers-reduced-motion: reduce) {
  .gw__chip, .gw__check, .topbar__dot, .eyebrow__pulse { animation: none; }
  .gw__packet, .gw__packet--out, .gw__packet--danger { display: none; }
}

/* ---------- Stat strip ---------- */
.stats { border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); background: var(--bg-2); }
.stats__grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 8px; padding: 34px 24px; }
.stat { text-align: center; padding: 8px; position: relative; }
.stat + .stat::before { content: ""; position: absolute; left: 0; top: 18%; height: 64%; width: 1px; background: var(--border); }
.stat__num { display: block; font-size: clamp(24px, 3vw, 34px); font-weight: 800; letter-spacing: -.03em; background: var(--grad); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.stat__label { display: block; margin-top: 6px; font-size: 13px; color: var(--text-2); }

/* ---------- Sections ---------- */
.section { padding: clamp(64px, 9vw, 110px) 0; }
.section__head { max-width: 720px; margin: 0 auto clamp(40px, 5vw, 60px); text-align: center; }
.kicker {
  display: inline-block; font-size: 13px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase;
  color: var(--blue); margin-bottom: 14px;
}
.section__head h2 { font-size: clamp(28px, 4vw, 42px); font-weight: 800; }
.section__sub { margin-top: 18px; font-size: clamp(16px, 1.4vw, 18px); color: var(--text-2); }
.section__sub code, .hero__lede code { background: var(--surface-3); padding: 2px 7px; border-radius: 6px; color: var(--text); border: 1px solid var(--border); }

.grid { display: grid; gap: 18px; }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }

/* ---------- Problem / risks ---------- */
.problem { background: var(--bg-2); }
.risk {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--r);
  padding: 26px 22px; transition: transform var(--t), border-color var(--t), box-shadow var(--t);
}
.risk:hover { transform: translateY(-4px); border-color: var(--border-2); box-shadow: var(--shadow); }
.risk__icon {
  width: 46px; height: 46px; border-radius: 12px; display: grid; place-items: center; margin-bottom: 16px;
  background: rgba(220,38,38,.12); color: #f87171; border: 1px solid rgba(220,38,38,.25);
}
.risk h3 { font-size: 17px; margin-bottom: 8px; }
.risk p { font-size: 14.5px; color: var(--text-2); }

/* ---------- Steps ---------- */
.steps { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; max-width: 980px; margin: 0 auto; }
.step {
  display: flex; gap: 18px; align-items: flex-start;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--r);
  padding: 26px; position: relative; overflow: hidden;
  transition: transform var(--t), border-color var(--t);
}
.step:hover { transform: translateY(-3px); border-color: var(--border-2); }
.step__num {
  font-family: var(--mono); font-size: 15px; font-weight: 700; color: #fff;
  background: var(--grad); border-radius: 11px; width: 44px; height: 44px;
  display: grid; place-items: center; flex: 0 0 auto;
}
.step__body h3 { font-size: 18px; margin-bottom: 7px; }
.step__body p { font-size: 14.5px; color: var(--text-2); }

/* ---------- Features tabs ---------- */
.tabs__nav {
  display: flex; flex-wrap: wrap; gap: 8px; justify-content: center;
  margin-bottom: 34px;
}
.tab {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 14.5px; font-weight: 600; color: var(--text-2);
  background: var(--surface); border: 1px solid var(--border);
  padding: 11px 18px; border-radius: 999px;
  transition: color var(--t), border-color var(--t), background var(--t), transform var(--t);
}
.tab svg { opacity: .8; }
.tab:hover { color: var(--heading); border-color: var(--border-2); }
.tab.is-active {
  color: #fff; border-color: transparent; background: var(--blue-600);
  box-shadow: var(--shadow-blue);
}
.tab.is-active svg { opacity: 1; }

.tabs__panel { animation: fadeUp .4s ease both; }
.tabs__panel[hidden] { display: none; }
@keyframes fadeUp { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }
@media (prefers-reduced-motion: reduce) { .tabs__panel { animation: none; } }

.fcard {
  display: flex; flex-direction: column;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--r);
  padding: 24px 22px; position: relative; overflow: hidden;
  transition: transform var(--t), border-color var(--t), box-shadow var(--t);
}
.fcard::after {
  content: ""; position: absolute; left: 0; top: 0; height: 3px; width: 100%;
  background: var(--grad); opacity: 0; transition: opacity var(--t);
}
.fcard:hover { transform: translateY(-4px); border-color: var(--border-2); box-shadow: var(--shadow); }
.fcard:hover::after { opacity: 1; }
.fcard h3 { font-size: 17px; margin-bottom: 9px; }
.fcard p { font-size: 14.5px; color: var(--text-2); }
.fcard code { background: var(--surface-3); padding: 1px 6px; border-radius: 5px; border: 1px solid var(--border); color: var(--text); }
.fcard em { color: var(--text); font-style: normal; font-weight: 600; }
.fcard__tags { display: flex; flex-wrap: wrap; gap: 7px; margin-top: 16px; }
.fcard__tags span {
  font-size: 11.5px; font-weight: 600; color: var(--text-2);
  background: var(--surface-3); border: 1px solid var(--border);
  padding: 4px 10px; border-radius: 999px;
}
.fcard__link {
  align-self: flex-start; margin-top: auto; padding-top: 16px;
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 13.5px; font-weight: 600; color: var(--blue);
  transition: color var(--t), gap var(--t);
}
.fcard__link:hover { color: var(--blue-glow); gap: 10px; }
.pill { display: inline-block; font-size: 11px; font-weight: 700; padding: 2px 8px; border-radius: 999px; vertical-align: middle; }
.pill--exp { background: rgba(234,88,12,.16); color: var(--warn); border: 1px solid rgba(234,88,12,.3); }

/* ---------- Architecture ---------- */
.architecture { background: var(--bg-2); }
.arch { max-width: 860px; margin: 0 auto; display: flex; flex-direction: column; align-items: stretch; gap: 0; }
.arch__layer {
  background: var(--surface); border: 1px solid var(--border-2); border-radius: var(--r);
  padding: 22px 24px; text-align: center; position: relative;
}
.arch__layer--ui { border-top: 3px solid var(--blue); }
.arch__layer--core { border-top: 3px solid var(--blue-700); background: linear-gradient(180deg, var(--surface-2), var(--surface)); }
.arch__layer--db { border-top: 3px solid var(--maroon); }
.arch__title { display: inline-flex; align-items: center; gap: 10px; font-weight: 700; color: var(--heading); font-size: 17px; justify-content: center; }
.arch__layer p { font-size: 14px; color: var(--text-2); margin-top: 6px; }
.arch__badge {
  font-family: var(--mono); font-size: 11px; font-weight: 700; color: var(--blue);
  background: rgba(37,99,235,.12); border: 1px solid rgba(37,99,235,.3);
  padding: 3px 9px; border-radius: 7px;
}
.arch__chips { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; margin-top: 14px; }
.arch__chips span {
  font-size: 13px; font-weight: 500; color: var(--text);
  background: var(--surface-3); border: 1px solid var(--border); padding: 6px 12px; border-radius: 8px;
}
.arch__pipe { display: grid; place-items: center; position: relative; height: 46px; }
.arch__pipe::before { content: ""; position: absolute; top: 0; bottom: 0; width: 2px; background: linear-gradient(var(--blue), var(--maroon)); opacity: .5; }
.arch__pipe span {
  position: relative; font-size: 12px; font-family: var(--mono); color: var(--text-2);
  background: var(--bg-2); padding: 3px 12px; border: 1px solid var(--border); border-radius: 999px;
}

.arch__proxies { margin-top: 26px; background: var(--surface); border: 1px dashed var(--border-2); border-radius: var(--r); padding: 22px 24px; }
.arch__proxies-head { text-align: center; font-weight: 700; color: var(--heading); margin-bottom: 16px; font-size: 15px; }
.arch__flowrow { display: flex; align-items: center; justify-content: center; gap: 14px; padding: 7px 0; flex-wrap: wrap; }
.arch__inst { font-family: var(--mono); font-size: 13px; font-weight: 600; color: var(--blue); background: rgba(37,99,235,.1); border: 1px solid rgba(37,99,235,.28); padding: 7px 14px; border-radius: 9px; min-width: 130px; text-align: center; }
.arch__arrow { color: var(--text-3); font-size: 18px; }
.arch__target { font-size: 13.5px; color: var(--text-2); min-width: 200px; text-align: center; }

/* ---------- Standards ---------- */
.badges { display: flex; flex-wrap: wrap; gap: 11px; justify-content: center; max-width: 920px; margin: 0 auto; }
.sbadge {
  font-size: 13.5px; font-weight: 600; color: var(--text);
  background: var(--surface); border: 1px solid var(--border-2); padding: 9px 16px; border-radius: 999px;
  transition: transform var(--t), border-color var(--t), color var(--t);
}
.sbadge:hover { transform: translateY(-2px); border-color: var(--blue); color: var(--blue); }

.integrations { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 50px; }
.integrations__col {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--r); padding: 24px;
  text-align: center;
}
.integrations__col h3 { font-size: 14px; text-transform: uppercase; letter-spacing: .06em; color: var(--text-3); margin-bottom: 16px; }
.chips { display: flex; flex-wrap: wrap; gap: 9px; justify-content: center; }
.chip { font-size: 13.5px; font-weight: 500; color: var(--text); background: var(--surface-3); border: 1px solid var(--border); padding: 7px 13px; border-radius: 9px; }

/* ---------- Quick start ---------- */
.qs { max-width: 860px; margin: 0 auto; }
.qs__tabs { display: flex; gap: 8px; justify-content: center; margin-bottom: 18px; flex-wrap: wrap; }
.qs__tab {
  font-size: 14px; font-weight: 600; color: var(--text-2);
  background: var(--surface); border: 1px solid var(--border); padding: 9px 18px; border-radius: 999px;
  transition: color var(--t), border-color var(--t), background var(--t);
}
.qs__tab:hover { color: var(--heading); border-color: var(--border-2); }
.qs__tab.is-active { color: #fff; background: var(--blue-600); border-color: transparent; }

.code { background: var(--code-bg); border: 1px solid var(--border-2); border-radius: var(--r); overflow: hidden; box-shadow: var(--shadow); }
.code[hidden] { display: none; }
.code__bar { display: flex; align-items: center; gap: 12px; padding: 11px 16px; border-bottom: 1px solid rgba(148,163,184,.14); background: rgba(255,255,255,.02); }
.code__dots { display: inline-flex; gap: 7px; }
.code__dots i { width: 11px; height: 11px; border-radius: 50%; background: #2a3650; display: block; }
.code__dots i:nth-child(1) { background: #ff5f57; }
.code__dots i:nth-child(2) { background: #febc2e; }
.code__dots i:nth-child(3) { background: #28c840; }
.code__name { font-family: var(--mono); font-size: 12.5px; color: #6b7e98; margin-right: auto; }
.code__copy {
  font-size: 12.5px; font-weight: 600; color: #9fb0c7;
  background: rgba(148,163,184,.1); border: 1px solid rgba(148,163,184,.2);
  padding: 5px 12px; border-radius: 7px; transition: all var(--t);
}
.code__copy:hover { color: #fff; border-color: var(--blue); }
.code__copy.is-copied { color: #34d399; border-color: rgba(52,211,153,.5); }
.code__body { margin: 0; padding: 20px 22px; overflow-x: auto; }
.code__body code { font-family: var(--mono); font-size: 13.5px; line-height: 1.85; color: #c8d4e6; white-space: pre; display: block; }
.code__body .c { color: #5b6b85; font-style: italic; }

.qs__note { display: flex; align-items: flex-start; gap: 9px; margin-top: 18px; font-size: 14px; color: var(--text-2); justify-content: center; text-align: left; }
.qs__note svg { color: var(--blue); flex: 0 0 auto; margin-top: 2px; }
.qs__link { color: var(--blue); font-weight: 600; text-decoration: underline; text-underline-offset: 2px; }
.qs__link:hover { color: var(--blue-glow); }

/* ---------- CTA ---------- */
.cta__card {
  position: relative; overflow: hidden; text-align: center;
  background: linear-gradient(160deg, var(--surface-2), var(--surface));
  border: 1px solid var(--border-2); border-radius: var(--r-xl);
  padding: clamp(44px, 6vw, 72px) 28px; box-shadow: var(--shadow);
}
.cta__glow { position: absolute; inset: 0; background: var(--grad-soft); opacity: .8; pointer-events: none; }
.cta__card > * { position: relative; z-index: 1; }
.cta__card h2 { font-size: clamp(26px, 3.6vw, 40px); font-weight: 800; }
.cta__card p { margin-top: 14px; font-size: 17px; color: var(--text-2); max-width: 520px; margin-inline: auto; }
.cta__actions { margin-top: 30px; display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* ---------- Footer ---------- */
.footer { border-top: 1px solid var(--border); background: var(--bg-2); padding: 60px 0 28px; }
.footer__inner { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 32px; }
.footer__brand .brand { margin-bottom: 14px; }
.footer__tag { font-size: 14px; color: var(--text-2); max-width: 320px; }
.footer__note { font-size: 12.5px; color: var(--text-3); max-width: 340px; margin-top: 12px; }
.footer__col h4 { font-size: 13px; text-transform: uppercase; letter-spacing: .06em; color: var(--text-3); margin-bottom: 14px; }
.footer__col a { display: block; font-size: 14px; color: var(--text-2); padding: 5px 0; transition: color var(--t); }
.footer__col a:hover { color: var(--blue); }
.footer__bottom { display: flex; align-items: center; justify-content: space-between; margin-top: 44px; padding-top: 22px; border-top: 1px solid var(--border); font-size: 13px; color: var(--text-3); }
.footer__ver { font-family: var(--mono); }

/* ---------- Request pipeline diagram ---------- */
.pipeline { max-width: 1160px; margin: clamp(44px, 6vw, 72px) auto 0; }
.pipeline__head { text-align: center; margin-bottom: 26px; }
.pipeline__head h3 { font-size: clamp(19px, 2.2vw, 24px); }
.pipeline__head p { margin-top: 8px; font-size: 14.5px; color: var(--text-2); }

.pipeline__scroll {
  background: linear-gradient(165deg, var(--surface-2), var(--surface));
  border: 1px solid var(--border-2);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow);
  padding: 18px 14px 6px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  position: relative;
}
.pipeline__scroll::before {
  content: ""; position: absolute; inset: 0; border-radius: var(--r-lg); padding: 1px;
  background: var(--grad); -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor; mask-composite: exclude; opacity: .35; pointer-events: none;
}
.pipeline__svg { width: 100%; min-width: 880px; height: auto; display: block; }

.pl__wire { stroke: var(--border-2); stroke-width: 2; }
.pl__wire--danger { stroke: rgba(220, 38, 38, .45); stroke-dasharray: 5 5; }
.pl__wire--soft { stroke: var(--border); stroke-dasharray: 4 5; }

.pl__packet { fill: var(--blue-glow); filter: drop-shadow(0 0 5px rgba(96,165,250,.9)); }
.pl__packet--danger { fill: var(--danger); filter: drop-shadow(0 0 6px rgba(220,38,38,.95)); }

.pl__node rect {
  fill: var(--surface-3); stroke: var(--border-2); stroke-width: 1.5;
  animation: plGlow 4.2s ease-in-out infinite;
  animation-delay: calc(var(--d, 0) * .52s);
}
.pl__node--core rect { fill: rgba(37, 99, 235, .14); stroke: rgba(96, 165, 250, .5); }
.pl__node--svc rect { fill: rgba(22, 163, 74, .1); stroke: rgba(52, 211, 153, .45); }
.pl__title { fill: var(--heading); font: 700 14.5px var(--font); text-anchor: middle; }
.pl__title--sm { font-size: 13px; font-weight: 600; }
.pl__title--danger { fill: #f87171; }
.pl__sub { fill: var(--text-3); font: 500 11px var(--font); text-anchor: middle; }
.pl__sub--danger { fill: rgba(248, 113, 113, .75); }
.pl__audit rect { fill: var(--surface-3); stroke: var(--border); stroke-width: 1.2; }
.pl__audit .pl__title--sm { fill: var(--text-2); }
.pl__block rect { fill: rgba(220, 38, 38, .1); stroke: rgba(220, 38, 38, .4); stroke-width: 1.5; }

@keyframes plGlow {
  0%, 100% { stroke: var(--border-2); }
  12% { stroke: var(--blue); filter: drop-shadow(0 0 6px rgba(96,165,250,.5)); }
  26% { stroke: var(--border-2); filter: none; }
}
@media (prefers-reduced-motion: reduce) {
  .pl__node rect { animation: none; }
  .pl__packet, .pl__packet--danger { display: none; }
}

.pipeline__legend {
  display: flex; flex-wrap: wrap; gap: 10px 26px; justify-content: center;
  margin-top: 18px; font-size: 13px; color: var(--text-2); font-weight: 500;
}
.pipeline__legend span { display: inline-flex; align-items: center; gap: 8px; }
.pipeline__legend i { display: inline-block; }

/* ---------- Product tour ---------- */
.tour { background: var(--bg-2); }
.tour__wrap { max-width: 1080px; margin: 0 auto; }

.tour__frame {
  position: relative;
  border-radius: var(--r-lg);
  border: 1px solid var(--border-2);
  background: var(--surface);
  box-shadow: var(--shadow), 0 40px 120px -40px rgba(37, 99, 235, .35);
  overflow: hidden;
}
.tour__frame::before {
  content: ""; position: absolute; inset: 0; border-radius: var(--r-lg); padding: 1px;
  background: var(--grad); -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor; mask-composite: exclude; opacity: .5; pointer-events: none; z-index: 2;
}
.tour__bar {
  display: flex; align-items: center; gap: 14px;
  padding: 11px 16px;
  background: var(--code-bg);
  border-bottom: 1px solid rgba(148, 163, 184, .14);
}
.tour__url {
  display: inline-flex; align-items: center; gap: 7px;
  font-family: var(--mono); font-size: 12px; color: #9fb0c7;
  background: rgba(148, 163, 184, .1); border: 1px solid rgba(148, 163, 184, .16);
  padding: 5px 14px; border-radius: 999px;
  margin: 0 auto; transform: translateX(-26px);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 82%;
}
.tour__url svg { flex: 0 0 auto; }
.tour__url svg { color: #34d399; }

.tour__stage { position: relative; background: #f8fafc; }
.tour__stage img {
  width: 100%; height: auto; display: block;
  aspect-ratio: 8 / 7; object-fit: cover; object-position: top;
  opacity: 1; transition: opacity .28s ease;
}
.tour__stage img.is-fading { opacity: 0; }

.tour__tabs {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px;
  margin-top: 22px;
}
.tour__tab {
  text-align: left;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--r-sm);
  padding: 13px 16px;
  transition: border-color var(--t), background var(--t), transform var(--t), box-shadow var(--t);
}
.tour__tab strong { display: block; font-size: 14px; color: var(--heading); letter-spacing: -.01em; }
.tour__tab span { display: block; margin-top: 3px; font-size: 12.5px; color: var(--text-3); line-height: 1.45; }
.tour__tab:hover { border-color: var(--border-2); transform: translateY(-2px); }
.tour__tab.is-active {
  border-color: var(--blue);
  background: linear-gradient(180deg, rgba(37, 99, 235, .12), var(--surface));
  box-shadow: 0 12px 30px -14px rgba(37, 99, 235, .45);
}
.tour__tab.is-active span { color: var(--text-2); }

/* ---------- Back to top ---------- */
.to-top {
  position: fixed; right: 22px; bottom: 22px; z-index: 90;
  width: 46px; height: 46px; border-radius: 13px;
  background: var(--blue-600); color: #fff; border: none; box-shadow: var(--shadow-blue);
  display: grid; place-items: center; opacity: 0; transform: translateY(12px);
  transition: opacity var(--t), transform var(--t), background var(--t);
}
.to-top.is-visible { opacity: 1; transform: none; }
.to-top:hover { background: var(--blue-700); }
.to-top[hidden] { display: none; }

/* ---------- Responsive ---------- */
@media (max-width: 980px) {
  .hero__inner { grid-template-columns: 1fr; }
  .hero__visual { order: -1; max-width: 480px; margin: 0 auto; }
  .stats__grid { grid-template-columns: repeat(3, 1fr); gap: 22px 8px; }
  .stat:nth-child(4)::before { display: none; }
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .integrations { grid-template-columns: 1fr; }
  .tour__tabs { grid-template-columns: repeat(2, 1fr); }
  .footer__inner { grid-template-columns: 1fr 1fr; gap: 28px; }
  .footer__brand { grid-column: 1 / -1; }
}

@media (max-width: 760px) {
  .nav__links, .nav__github { display: none; }
  .nav__burger { display: inline-grid; }
  .grid--3, .grid--4, .steps { grid-template-columns: 1fr; }
  .stats__grid { grid-template-columns: repeat(2, 1fr); }
  .stat::before { display: none !important; }
  .arch__flowrow { flex-direction: column; gap: 6px; }
  .arch__arrow { transform: rotate(90deg); }
  .tour__tabs { grid-template-columns: 1fr; }
  .tour__url { transform: none; }
  .footer__inner { grid-template-columns: 1fr 1fr; }
  .footer__bottom { flex-direction: column; gap: 8px; }
}

@media (max-width: 460px) {
  .container { padding: 0 18px; }
  .gw__chip--block { left: -2%; }
  .gw__chip--ok { right: -2%; }
  .footer__inner { grid-template-columns: 1fr; }
}