:root {
  color-scheme: dark;
  --color-primary: #0e1730;
  --color-primary-soft: #16224a;
  --color-on-primary: #f2f4f8;
  --color-secondary: #0a0a0a;
  --color-on-secondary: #eceef2;
  --color-accent: #2979ff;
  --color-cta: #1f6ef2;
  --color-cta-hover: #1a5fd4;
  --color-on-accent: #ffffff;
  --color-text: #c6cbd4;
  --color-surface: #10131c;
  --color-surface-raised: #171c2a;
  --color-border: rgb(255 255 255 / 0.12);
  --color-muted: #8a8d94;
  --container: 1240px;
  --gutter: clamp(20px, 4vw, 56px);
  --radius: 16px;
  --header-height: 72px;
  --mobile-navigation-bar-height: 0px;
  --floating-action-right: 25px;
  --floating-action-bottom: 25px;
  --whatsapp-size: 48px;
  --back-to-top-size: 40px;
  --floating-gap: 12px;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--color-secondary);
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  overflow-x: clip;
  color: var(--color-text);
  background: var(--color-secondary);
  font-family: Manrope, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

body.drawer-open {
  overflow: hidden;
}

button,
a {
  font: inherit;
}

a {
  color: inherit;
}

button {
  color: inherit;
}

svg,
canvas {
  display: block;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1,
h2,
h3,
.button {
  font-family: Manrope, Arial, sans-serif;
}

h1,
h2,
h3 {
  color: var(--color-on-secondary);
  text-wrap: balance;
}

h1 {
  margin-bottom: 24px;
  font-size: 48px;
  font-weight: 500;
  line-height: 1.02;
  letter-spacing: -0.045em;
}

h2 {
  margin-bottom: 24px;
  font-size: 40px;
  font-weight: 500;
  line-height: 1.08;
  letter-spacing: -0.04em;
}

h3 {
  margin-bottom: 14px;
  font-size: 24px;
  font-weight: 500;
  line-height: 1.16;
  letter-spacing: -0.025em;
}

p {
  line-height: 1.65;
}

.container {
  width: min(var(--container), calc(100% - (var(--gutter) * 2)));
  margin-inline: auto;
}

.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-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 1000;
  padding: 10px 14px;
  color: var(--color-on-accent);
  background: var(--color-accent);
  border-radius: 8px;
  transform: translateY(-150%);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 80;
  height: var(--header-height);
  border-bottom: 1px solid transparent;
  background: rgb(10 10 10 / 0);
  transition: background-color 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

/* Sticky state goes light to match the page's light sections. */
.site-header[data-scrolled="true"] {
  border-color: rgb(14 23 48 / 0.1);
  background: rgb(255 255 255 / 0.92);
  box-shadow: 0 14px 30px rgb(14 23 48 / 0.08);
  backdrop-filter: blur(14px);
}

.site-header[data-scrolled="true"] .desktop-nav a,
.site-header[data-scrolled="true"] .menu-toggle {
  color: #3c4250;
}

.site-header[data-scrolled="true"] .desktop-nav a:hover,
.site-header[data-scrolled="true"] .menu-toggle:hover {
  color: #0e1730;
}

/* Two wordmarks, cross-faded: the white-text logo can't be recoloured by CSS,
   and the sticky bar is now light. */
.wordmark {
  position: relative;
}

.wordmark__on-light {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  transition: opacity 0.25s ease;
}

.site-header[data-scrolled="true"] .wordmark > img:first-child {
  opacity: 0;
}

.site-header[data-scrolled="true"] .wordmark__on-light {
  opacity: 1;
}

.wordmark > img:first-child {
  transition: opacity 0.25s ease;
}

.site-header__inner {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  width: min(1400px, calc(100% - 48px));
  height: 100%;
  margin-inline: auto;
}

.wordmark {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
}

.wordmark img {
  display: block;
  width: auto;
  height: 22px;
}

.wordmark--footer {
  margin-bottom: 16px;
}

.wordmark--footer img {
  height: 26px;
}

@media (max-width: 767px) {
  .wordmark img {
    height: 20px;
  }

  .wordmark--footer img {
    height: 22px;
  }
}

.desktop-nav {
  display: flex;
  justify-content: center;
  gap: clamp(22px, 2.6vw, 42px);
}

.desktop-nav a,
.site-footer a {
  color: var(--color-text);
  font-size: 14px;
  text-decoration: none;
  transition: color 0.2s ease;
}

.desktop-nav a:hover,
.site-footer a:hover {
  color: var(--color-on-secondary);
}

[aria-disabled="true"] {
  cursor: default;
}

.button {
  --button-shine-streak: rgb(255 255 255 / 0.42);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  padding: 0 24px;
  color: var(--color-on-accent);
  background: var(--color-cta);
  border: 1px solid var(--color-cta);
  border-radius: 10px;
  font-size: 15px;
  font-weight: 700;
  line-height: 1;
  text-decoration: none;
  white-space: nowrap;
  transition: transform 0.2s ease, background-color 0.2s ease;
}

.button:hover,
.button:focus-visible {
  background: var(--color-cta-hover);
  border-color: var(--color-cta-hover);
  transform: translateY(-2px);
}

.button:active {
  transform: translateY(1px);
}

.button--small {
  min-height: 42px;
  padding-inline: 18px;
  font-size: 13px;
}

.button-shine {
  position: relative;
  isolation: isolate;
  overflow: hidden;
}

.button-shine > span,
.button-shine > svg {
  position: relative;
  z-index: 1;
}

.button-shine::after {
  position: absolute;
  top: 0;
  left: -200%;
  z-index: 0;
  width: 200%;
  height: 100%;
  background-image: linear-gradient(to right, transparent, var(--button-shine-streak), transparent);
  transform: skewX(-20deg);
  pointer-events: none;
  content: "";
}

.button-shine:hover::after,
.button-shine:focus-visible::after {
  animation: btn-shine 1.2s ease 0.1s;
}

@keyframes btn-shine {
  to { left: 200%; }
}

.menu-toggle,
.drawer-close {
  display: none;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  padding: 0;
  color: var(--color-on-secondary);
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: 10px;
}

.menu-toggle svg,
.drawer-close svg {
  width: 20px;
  height: 20px;
}

.mobile-drawer {
  position: fixed;
  inset-block: 0;
  left: 0;
  z-index: 101;
  width: min(380px, 88vw);
  padding: 24px;
  background: var(--color-primary);
  border-right: 1px solid var(--color-border);
  transform: translateX(-100%);
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.mobile-drawer[data-state="open"] {
  transform: translateX(0);
}

.mobile-drawer__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 48px;
}

.mobile-drawer nav {
  display: grid;
  margin-bottom: 32px;
}

.mobile-drawer nav a {
  padding: 18px 0;
  color: var(--color-on-primary);
  border-bottom: 1px solid var(--color-border);
  font-family: Manrope, Arial, sans-serif;
  font-size: 24px;
  text-decoration: none;
}

.drawer-scrim {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgb(0 0 0 / 0.68);
  backdrop-filter: blur(3px);
}

.eyebrow {
  margin-bottom: 22px;
  color: var(--color-accent);
  font-family: Manrope, Arial, sans-serif;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

main section[id] {
  scroll-margin-top: var(--header-height);
}

.section {
  position: relative;
  padding: clamp(104px, 11vw, 176px) 0;
}

.section--navy {
  color: var(--color-text);
  background: var(--color-primary);
}

/* #2979FF reads 4.45:1 on navy — one step lighter keeps eyebrows above 4.5. */
/* ---------- Light section variant ---------- */
.section--light {
  color: #4b5160;
  background: #f2f4f8;
}

.section--light h2,
.section--light h3 {
  color: #0e1730;
}

.section--light .eyebrow {
  color: var(--color-cta);
}

/* Frosted-glass panes: a soft drop shadow lifts them off the light ground and
   sells the depth that a flat fill can't. */
.section--light .who__diagram > g > rect {
  filter: drop-shadow(0 18px 30px rgb(14 23 48 / 0.1));
}

/* Diagram colours are baked to inverted greys in the markup, so the embedded
   wordmark can keep its colour — a CSS filter here would repaint it too. */

.section--light .who__logo {
  color: #6b7280;
  background:
    repeating-linear-gradient(135deg, rgb(14 23 48 / 0.05) 0 6px, transparent 6px 12px),
    #ffffff;
  border-color: rgb(14 23 48 / 0.14);
}

.section--light .who__logo:hover {
  color: #0e1730;
  border-color: rgb(31 110 242 / 0.55);
}

/* Cursor spotlight is tuned for dark ground — soften it on light. */
.section--light.who::after {
  background-image: radial-gradient(circle 280px at var(--mx) var(--my), rgb(31 110 242 / 0.12) 0%, rgb(31 110 242 / 0.05) 40%, transparent 75%);
}

/* Light treatment for the audience panel (#your-stack) */
.section--light.stack {
  background: #f2f4f8;
}

.section--light .stack__panel {
  background: #ffffff;
  border-color: rgb(14 23 48 / 0.09);
  box-shadow: 0 24px 60px rgb(14 23 48 / 0.07);
}

.section--light .stack__heading p {
  color: #5c6270;
}



.section--light .stack-card {
  background: #f7f8fb;
  border-color: rgb(14 23 48 / 0.09);
}

.section--light .stack-card__head {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
}

/* Icon sits beside the title now, so its own bottom margin is dropped. */
.stack-card__head .stack-card__icon {
  flex: 0 0 auto;
  margin-bottom: 0;
}

.stack-card__icon {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  margin-bottom: 20px;
  color: color-mix(in srgb, var(--card-accent) 72%, #fff);
  background: color-mix(in srgb, var(--card-accent) 13%, transparent);
  border: 1px solid color-mix(in srgb, var(--card-accent) 34%, transparent);
  border-radius: 11px;
  transition: background-color 0.3s ease, border-color 0.3s ease, transform 0.3s ease;
}

.section--light .stack-card:hover .stack-card__head {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
}

/* Icon sits beside the title now, so its own bottom margin is dropped. */
.stack-card__head .stack-card__icon {
  flex: 0 0 auto;
  margin-bottom: 0;
}

.stack-card__icon {
  background: color-mix(in srgb, var(--card-accent) 16%, #ffffff);
  border-color: color-mix(in srgb, var(--card-accent) 50%, transparent);
}

/* On a light card the original mixes toward #fff and wash out, so the chip gets
   ink-based neutrals at rest and the brand hue on hover. */
.section--light .stack-card__icon {
  color: #3c4250;
  background: rgb(14 23 48 / 0.05);
  border-color: rgb(14 23 48 / 0.14);
}

.section--light .stack-card:hover .stack-card__icon {
  color: var(--card-live);
  background: color-mix(in srgb, var(--card-live) 12%, #ffffff);
  border-color: color-mix(in srgb, var(--card-live) 42%, transparent);
}

.section--light .stack-card:hover {
  border-color: color-mix(in srgb, var(--card-live) 45%, transparent);
  box-shadow: 0 14px 32px color-mix(in srgb, var(--card-live) 15%, transparent);
}

.section--light .stack-card p {
  max-width: 460px;
  margin: 8px 0 0;
  color: #a4a6ab;
  font-size: 14px;
  line-height: 1.5;
}

/* Light treatment for the trust section (#trust) */
.section--light.trust {
  background: #ffffff;
}

/* Section ground is white, so the cards step slightly grey to stay legible. */
.section--light .trust-card {
  background: linear-gradient(168deg, #f7f8fb 0%, #f2f4f8 100%);
  border-color: rgb(14 23 48 / 0.1);
}

.section--light .trust-card:hover {
  border-color: rgb(31 110 242 / 0.35);
  box-shadow: 0 18px 40px rgb(14 23 48 / 0.1);
}

.section--light .trust-card p {
  color: #5c6270;
}

.section--light .trust-card__index {
  color: rgb(14 23 48 / 0.35);
}

.section--light .trust-card:hover .trust-card__index {
  color: rgb(31 110 242 / 0.8);
}

/* Hover reveals the brand hue; the resting state stays black & white. */
.section--light .trust-card { --trust-live: #2979ff; }
.section--light .trust-card:nth-of-type(2) { --trust-live: #535bff; }
.section--light .trust-card:nth-of-type(3) { --trust-live: #7c4dff; }

.section--light .trust-card:hover .trust-card__index {
  color: color-mix(in srgb, var(--trust-live) 85%, transparent);
}

.section--light .trust-card:hover {
  border-color: color-mix(in srgb, var(--trust-live) 45%, transparent);
  box-shadow: 0 22px 48px color-mix(in srgb, var(--trust-live) 16%, transparent);
}

.section--light .trust-card:hover .trust-card__icon {
  color: var(--trust-live);
  background: color-mix(in srgb, var(--trust-live) 12%, #ffffff);
  border-color: color-mix(in srgb, var(--trust-live) 42%, transparent);
}

.section--light .trust-card:hover::after {
  background: radial-gradient(circle 260px at var(--mx) var(--my), color-mix(in srgb, var(--trust-live) 14%, transparent) 0%, color-mix(in srgb, var(--trust-live) 5%, transparent) 45%, transparent 76%);
}

.section--light .trust-card:hover::before {
  --_glow: color-mix(in srgb, var(--trust-live) 55%, transparent);
  --_core: var(--trust-live);
}

.section--light .trust-card__icon {
  color: var(--color-cta);
  background: rgb(31 110 242 / 0.09);
  border-color: rgb(31 110 242 / 0.24);
}

.section--light .trust-card:hover .trust-card__icon {
  background: rgb(31 110 242 / 0.16);
  border-color: rgb(31 110 242 / 0.5);
}

/* Light treatment for the own-the-stack section */
.section--light.own {
  background: #f2f4f8;
}

.section--light .own__intro > p {
  color: #5c6270;
}

.section--light .own__terrain {
  background: #ffffff;
  border: 1px solid rgb(14 23 48 / 0.08);
}

.section--light .own-card {
  background: #ffffff;
  border-color: rgb(14 23 48 / 0.09);
}

.section--light .own-card:hover {
  background: color-mix(in srgb, var(--card-accent) 5%, #ffffff);
  border-color: color-mix(in srgb, var(--card-accent) 40%, transparent);
  box-shadow: 0 16px 36px rgb(14 23 48 / 0.09);
}

.section--light .own-card p {
  color: #5c6270;
}

/* Light treatment for the closing CTA */
.section--light.final-cta {
  position: relative;
  background: #f2f4f8;
}

/* Cursor spotlight is tuned for dark ground — soften it on light. */
.section--light.final-cta::after {
  background-image: radial-gradient(circle 280px at var(--mx) var(--my), rgb(31 110 242 / 0.1) 0%, rgb(31 110 242 / 0.04) 40%, transparent 75%);
}

.section--light.final-cta .button {
  color: #ffffff;
}

/* Trust cards in black & white: greys replace the blue accents, and the
   travelling border spark keeps its motion in graphite instead of brand blue. */
.section--light .trust-card__index {
  color: rgb(14 23 48 / 0.38);
}

/* Hover reveals the brand hue; the resting state stays black & white. */
.section--light .trust-card { --trust-live: #2979ff; }
.section--light .trust-card:nth-of-type(2) { --trust-live: #535bff; }
.section--light .trust-card:nth-of-type(3) { --trust-live: #7c4dff; }

.section--light .trust-card:hover .trust-card__index {
  color: color-mix(in srgb, var(--trust-live) 85%, transparent);
}

.section--light .trust-card:hover {
  border-color: color-mix(in srgb, var(--trust-live) 45%, transparent);
  box-shadow: 0 22px 48px color-mix(in srgb, var(--trust-live) 16%, transparent);
}

.section--light .trust-card:hover .trust-card__icon {
  color: var(--trust-live);
  background: color-mix(in srgb, var(--trust-live) 12%, #ffffff);
  border-color: color-mix(in srgb, var(--trust-live) 42%, transparent);
}

.section--light .trust-card:hover::after {
  background: radial-gradient(circle 260px at var(--mx) var(--my), color-mix(in srgb, var(--trust-live) 14%, transparent) 0%, color-mix(in srgb, var(--trust-live) 5%, transparent) 45%, transparent 76%);
}

.section--light .trust-card:hover::before {
  --_glow: color-mix(in srgb, var(--trust-live) 55%, transparent);
  --_core: var(--trust-live);
}

.section--light .trust-card__icon {
  color: #2b2f38;
  background: rgb(14 23 48 / 0.06);
  border-color: rgb(14 23 48 / 0.16);
}

.section--light .trust-card::after {
  background: radial-gradient(circle 260px at var(--mx) var(--my), rgb(14 23 48 / 0.07) 0%, rgb(14 23 48 / 0.03) 45%, transparent 76%);
}

.section--light .trust-card::before {
  --_glow: rgb(14 23 48 / 0.4);
  --_core: #6b7280;
}

/* The headline accent is one of the few brand-gradient moments; in the
   black & white treatment it reads as graphite. */
.section--light .trust__accent {
  background: linear-gradient(90deg, #0e1730, #6b7280);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.section--navy .eyebrow {
  color: #3d85ff;
}

.section--navy h2,
.section--navy h3 {
  color: var(--color-on-primary);
}

.pull-apart {
  position: relative;
  height: 260vh; /* 29/8: rút ngắn scroll — ra hình khối nhanh hơn */
  min-height: 1100px;
  background: #08090c;
}

.pull-apart__stage {
  position: relative;
  width: 100%;
  height: 100dvh;
  min-height: 620px;
  overflow: hidden;
  background: #08090c;
}

.pull-apart__stage.is-globe {
  cursor: grab;
}

.pull-apart__stage.is-globe.is-grabbing {
  cursor: grabbing;
}

.pull-apart__canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  touch-action: pan-y;
}

.pull-apart__copy {
  position: absolute;
  top: max(14vh, calc(var(--header-height) + 40px));
  left: 50%;
  z-index: 3;
  width: min(980px, calc(100% - 48px));
  text-align: center;
  transform: translate3d(-50%, 0, 0);
  transform-origin: 50% 0;
  pointer-events: none;
  will-change: transform, opacity;
}

.pull-apart__copy h1,
.pull-apart__next-copy h2 {
  margin: 0;
  font-size: clamp(32px, 2.15vw, 42px);
  font-weight: 500;
  line-height: 1.05;
}

.pull-apart__copy h1 {
  letter-spacing: normal; /* heading uppercase — bỏ tracking âm */
}

.pull-apart__next-copy h2 {
  letter-spacing: -0.045em;
}

.pull-apart__copy p,
.pull-apart__next-copy p {
  max-width: 900px;
  margin: 10px auto 0;
  color: rgb(236 238 242 / 0.58);
  font-size: clamp(16px, 1.05vw, 20px);
  line-height: 1.4;
  letter-spacing: -0.02em;
}

.pull-apart__next-copy {
  position: absolute;
  bottom: 6.2vh;
  left: 50%;
  z-index: 3;
  width: min(1080px, calc(100% - 48px));
  text-align: center;
  opacity: 0;
  transform: translate3d(-50%, 20px, 0);
  pointer-events: none;
  will-change: transform, opacity;
}

.pull-apart__cta {
  margin-top: 26px;
}

.pull-apart__next-copy[aria-hidden="false"] .pull-apart__cta {
  pointer-events: auto;
}

.pull-apart__fallback {
  position: absolute;
  inset: 0;
  z-index: 0;
  display: none;
  place-items: center;
}

/* Draggable label orbit (static-mode stand-in for the WebGL scene) */
.pf-orbit {
  position: relative;
  width: min(820px, 100%);
  height: 100%;
  min-height: 430px;
  overflow: hidden;
  touch-action: pan-y;
  cursor: grab;
  user-select: none;
  -webkit-user-select: none;
}

.pf-orbit.is-dragging {
  cursor: grabbing;
}

.pf-orbit__spokes {
  position: absolute;
  inset: 0;
  z-index: 2;
  width: 100%;
  height: 100%;
  fill: none;
  stroke-width: 1;
  filter: drop-shadow(0 0 3px rgb(143 180 255 / 0.4));
  pointer-events: none;
}

.pf-orbit__logo {
  position: absolute;
  top: 50%;
  left: 50%;
  z-index: 12;
  padding: 14px 20px;
  background: rgb(11 17 32 / 0.92);
  border: 1px solid rgb(245 247 250 / 0.4);
  border-radius: 12px;
  box-shadow: 0 0 42px rgb(83 91 255 / 0.35);
  transform: translate(-50%, -50%);
  pointer-events: none;
}

.pf-orbit__logo img {
  display: block;
  width: 148px;
  height: auto;
}

.pf-node {
  position: absolute;
  top: 50%;
  left: 50%;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 9px;
  color: rgb(245 247 250 / 0.85);
  background: rgb(11 17 32 / 0.85);
  border: 1px solid rgb(245 247 250 / 0.28);
  border-radius: 999px;
  font: 500 10px/1.4 Manrope, Arial, sans-serif;
  letter-spacing: 0.03em;
  white-space: nowrap;
  will-change: transform, opacity;
  pointer-events: none;
}

.pf-node i {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  animation: who-pulse 2.4s ease-in-out infinite;
}

/* Static mode (now the only mode): one 100dvh screen — heading on top, the
   draggable label orbit in the middle, bridging copy + CTA at the bottom. */
.pull-apart[data-mode="static"] {
  height: auto;
  min-height: 0;
}

.pull-apart[data-mode="static"] .pull-apart__stage {
  display: grid;
  height: auto;
  min-height: 100dvh;
  padding: calc(var(--header-height) + 42px) 0 56px;
  grid-template-rows: auto minmax(400px, 1fr) auto;
}

.pull-apart[data-mode="static"] .pull-apart__canvas {
  display: none;
}

.pull-apart[data-mode="static"] .pull-apart__copy,
.pull-apart[data-mode="static"] .pull-apart__next-copy {
  position: relative;
  top: auto;
  bottom: auto;
  left: auto;
  grid-row: auto;
  width: min(980px, calc(100% - 48px));
  margin-inline: auto;
  opacity: 1;
  transform: none;
  pointer-events: auto;
}

.pull-apart[data-mode="static"] .pull-apart__fallback {
  position: relative;
  inset: auto;
  display: grid;
  grid-row: 2;
  place-items: center;
  min-height: 400px;
}

.pf-orbit {
  min-height: 400px;
}

.pull-apart__status {
  position: absolute;
  right: 20px;
  bottom: 16px;
  z-index: 5;
  margin: 0;
  color: var(--color-muted);
  font: 12px/1.4 Manrope, Arial, sans-serif;
}

.who {
  --mx: 50%;
  --my: 50%;
  padding-top: clamp(128px, 14vw, 210px);
  overflow: clip;
}

/* Faint blueprint grid, always on */
.who::before,
.security::before,
.final-cta::before,
.why::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}

/* Cursor spotlight: brighter grid + glow revealed around the pointer */
.who::after,
.security::after,
.final-cta::after,
.why::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  background-image:
    radial-gradient(circle 280px at var(--mx) var(--my), rgb(41 121 255 / 0.2) 0%, rgb(41 121 255 / 0.08) 40%, transparent 75%);
  background-size: 100% 100%;
  -webkit-mask-image: radial-gradient(circle 240px at var(--mx) var(--my), rgb(0 0 0) 0%, rgb(0 0 0 / 0.55) 45%, transparent 82%);
  mask-image: radial-gradient(circle 240px at var(--mx) var(--my), rgb(0 0 0) 0%, rgb(0 0 0 / 0.55) 45%, transparent 82%);
  opacity: 0;
  transition: opacity 320ms ease;
}

.who:hover::after,
.security:hover::after,
.final-cta:hover::after,
.why:hover::after {
  opacity: 1;
}

@media (prefers-reduced-motion: reduce) {
  .who::after,
  .security::after,
  .final-cta::after,
  .why::after {
    display: none;
  }
}

.who__grid {
  display: grid;
  grid-template-columns: 1.08fr 0.92fr;
  align-items: center;
  gap: clamp(64px, 9vw, 140px);
}

.who__copy h2 {
  max-width: 650px;
}

.who__copy { min-width: 0; }

.who__copy > p:last-of-type {
  max-width: 610px;
  margin-bottom: 0;
  font-size: 18px;
}

.who__visual {
  position: relative;
  display: grid;
  min-height: 520px;
  place-items: center;
}

.who__visual {
  perspective: 900px;
}

.who__diagram {
  display: block;
  width: 100%;
  height: auto;
  max-height: 540px;
  transform-style: preserve-3d;
  will-change: transform;
}

.who__diagram .who-ai {
  filter: drop-shadow(0 0 16px rgb(83 91 255 / 0.7));
}

.who-dot {
  transform-box: fill-box;
  transform-origin: center;
  animation: who-pulse 2.4s ease-in-out infinite;
}

@keyframes who-pulse {
  0%, 100% { opacity: 0.6; transform: scale(0.92); }
  50% { opacity: 1; transform: scale(1.1); }
}

/* Soft ripple wave expanding out of each dot */
.who-wave {
  transform-box: fill-box;
  transform-origin: center;
  opacity: 0;
  animation: who-wave 2.2s ease-out infinite;
}

@keyframes who-wave {
  0% { transform: scale(1); opacity: 0.5; }
  70%, 100% { transform: scale(2.6); opacity: 0; }
}

/* Layer-1 node groups circle around their anchor (dot + wave move as one) */
.who-orbit {
  transform-box: fill-box;
  transform-origin: center;
  animation: who-orbit 4.5s linear infinite;
}

@keyframes who-orbit {
  0% { transform: translate(0, calc(var(--r, 7px) * -1)); }
  12.5% { transform: translate(calc(var(--r, 7px) * 0.707), calc(var(--r, 7px) * -0.707)); }
  25% { transform: translate(var(--r, 7px), 0); }
  37.5% { transform: translate(calc(var(--r, 7px) * 0.707), calc(var(--r, 7px) * 0.707)); }
  50% { transform: translate(0, var(--r, 7px)); }
  62.5% { transform: translate(calc(var(--r, 7px) * -0.707), calc(var(--r, 7px) * 0.707)); }
  75% { transform: translate(calc(var(--r, 7px) * -1), 0); }
  87.5% { transform: translate(calc(var(--r, 7px) * -0.707), calc(var(--r, 7px) * -0.707)); }
  100% { transform: translate(0, calc(var(--r, 7px) * -1)); }
}

/* Dashes march along the converge lines */
.who-lines {
  animation: who-dash 0.2s linear infinite;
}

@keyframes who-dash {
  to { stroke-dashoffset: -9; }
}

.who-travel {
  offset-rotate: 0deg;
  animation: who-travel 4.2s linear infinite;
  opacity: 0;
  filter: drop-shadow(0 0 6px rgb(41 121 255 / 0.6));
}

@keyframes who-travel {
  0% { offset-distance: 0%; opacity: 0; }
  10% { opacity: 1; }
  90% { opacity: 1; }
  100% { offset-distance: 100%; opacity: 0; }
}

@media (prefers-reduced-motion: reduce) {
  .who-dot,
  .who-orbit,
  .who-wave,
  .who-lines,
  .who-travel {
    animation: none;
  }

  .how-stage,
  .how-panel__dot,
  .how-panel__dot::before,
  .how-link,
  .how-link__pulse,
  .why-pulse,
  .why-travel,
  .why-drift,
  .why-gen,
  .why-node {
    animation: none;
    opacity: 1;
    clip-path: none;
  }

  .how-box {
    transition: none;
  }

  #stack-diagram {
    cursor: default;
  }

  .who-travel {
    opacity: 0;
  }
}

.plane {
  position: absolute;
  top: 50%;
  left: 50%;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  width: min(410px, 80%);
  aspect-ratio: 1.25;
  padding: 32px;
  border: 1px solid rgb(255 255 255 / 0.32);
  border-radius: var(--radius);
  transform-style: preserve-3d;
}

.plane span {
  border: 1px solid rgb(41 121 255 / 0.34);
  border-radius: 10px;
}

.plane--rear {
  transform: translate3d(-38%, -68%, -180px) rotateY(-14deg);
  opacity: 0.42;
}

.plane--middle {
  transform: translate3d(-50%, -50%, -30px) rotateY(-14deg);
  background: rgb(255 255 255 / 0.04);
  opacity: 0.68;
}

.plane--front {
  display: grid;
  place-items: center;
  transform: translate3d(-62%, -30%, 125px) rotateY(-14deg);
  background: rgb(41 121 255 / 0.1);
  box-shadow: inset 0 1px 0 rgb(255 255 255 / 0.08);
}

.plane--front strong {
  color: var(--color-accent);
  font: 700 60px/1 Manrope, Arial, sans-serif;
}





.how {
  position: relative;
  height: 460dvh;
  padding: 0;
  background: #07080b;
  overflow: clip;
  --slide-accent: #2979ff;
}

.how:focus-visible {
  outline: 1px solid color-mix(in srgb, var(--slide-accent) 70%, white);
  outline-offset: -5px;
}

.how-slider__layout {
  --mx: 50%;
  --mxv: 50vw;
  --my: 50%;
  position: sticky;
  top: 0;
  display: grid;
  grid-template-columns: minmax(330px, 0.68fr) minmax(580px, 1.45fr);
  grid-template-rows: minmax(0, 1fr) auto;
  column-gap: clamp(52px, 6vw, 110px);
  height: 100dvh;
  min-height: 0;
  padding: clamp(118px, 10vw, 160px) 0 52px;
}

/* Faint blueprint grid on the near-black stage */
.how-slider__layout::before {
  content: "";
  position: absolute;
  inset: 0 calc(50% - 50vw);
  pointer-events: none;
  z-index: 0;
}

/* Cursor spotlight — softer than the navy section so the black stays black */
.how-slider__layout::after {
  content: "";
  position: absolute;
  inset: 0 calc(50% - 50vw);
  pointer-events: none;
  z-index: 1;
  background-image:
    radial-gradient(circle 280px at var(--mxv) var(--my), rgb(41 121 255 / 0.14) 0%, rgb(41 121 255 / 0.05) 40%, transparent 75%);
  background-size: 100% 100%;
  -webkit-mask-image: radial-gradient(circle 240px at var(--mxv) var(--my), rgb(0 0 0) 0%, rgb(0 0 0 / 0.55) 45%, transparent 82%);
  mask-image: radial-gradient(circle 240px at var(--mxv) var(--my), rgb(0 0 0) 0%, rgb(0 0 0 / 0.55) 45%, transparent 82%);
  opacity: 0;
  transition: opacity 320ms ease;
}

.how-slider__layout:hover::after {
  opacity: 1;
}

@media (prefers-reduced-motion: reduce) {
  .how-slider__layout::after {
    display: none;
  }
}

.how-slider__copy {
  position: relative;
  z-index: 2;
  display: flex;
  min-width: 0;
  flex-direction: column;
  align-items: flex-start;
  padding-top: clamp(8px, 2vw, 30px);
}

.how-slider__title {
  margin-bottom: 20px;
  color: #3d85ff;
  font-family: Manrope, Arial, sans-serif;
  font-size: 12px;
  font-weight: 500;
  line-height: 1.4;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

@media (max-width: 767px) {
  .how-slider__title {
    margin-bottom: 16px;
  }
}

.how-slider__badge {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  min-height: 34px;
  margin: 0 0 16px;
  padding: 0 13px;
  color: #f5f6f8;
  background: var(--slide-accent);
  border-radius: 4px;
  font: 600 12px/1 Manrope, Arial, sans-serif;
  letter-spacing: 0.08em;
  transition: background-color 0.4s cubic-bezier(0.22, 1, 0.36, 1);
}

.how-slider__badge span {
  font-size: 10px;
}

.how-slider__slides {
  position: relative;
  width: 100%;
  min-height: 240px;
}

.how-slide {
  position: absolute;
  inset: 0;
  visibility: hidden;
  opacity: 0;
  pointer-events: none;
}

.how-slide.is-active {
  visibility: visible;
  opacity: 1;
  pointer-events: auto;
}

.how-slide.is-leaving {
  visibility: visible;
  pointer-events: none;
}

.how-slide h3 {
  max-width: 520px;
  margin: 0;
  color: #f0f2f5;
  font-size: clamp(38px, 3.5vw, 58px);
  font-weight: 450;
  line-height: 1.03;
  letter-spacing: -0.045em;
}

.how-slide p {
  max-width: 500px;
  margin: 18px 0 0;
  color: #a2a6ad;
  font-size: 15px;
  line-height: 1.6;
}

.how-slider__controls {
  display: flex;
  gap: 8px;
  margin-top: auto;
  padding-bottom: 34px;
}

.how-slider__controls button {
  display: grid;
  width: 44px;
  height: 44px;
  padding: 0;
  place-items: center;
  color: #f5f6f8;
  background: #26272c;
  border: 1px solid rgb(255 255 255 / 0.06);
  border-radius: 8px;
  cursor: pointer;
  transition: color 0.2s ease, background-color 0.2s ease, opacity 0.2s ease, transform 0.2s ease;
}

.how-slider__controls button:hover:not(:disabled),
.how-slider__controls button:focus-visible:not(:disabled) {
  color: #08090c;
  background: var(--slide-accent);
  transform: translateY(-2px);
}

.how-slider__controls button:disabled {
  opacity: 0.32;
  cursor: default;
}

.how-slider__controls svg {
  width: 21px;
  height: 21px;
}

.how-slider__visual {
  position: relative;
  min-width: 0;
  min-height: 570px;
  will-change: transform;
}

#stack-diagram {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  perspective: 1400px;
  cursor: grab;
  touch-action: pan-y;
  user-select: none;
}

#stack-diagram.is-dragging {
  cursor: grabbing;
}

.how-stage {
  margin-top: -64px;
  transform-style: preserve-3d;
  animation: how-float 9s ease-in-out infinite alternate;
}

@keyframes how-float {
  from { transform: rotateX(0deg); }
  to { transform: rotateX(5deg); }
}

/* 4 square walls in a true 3D ring — no lid, no floor */
.how-box {
  --box-size: min(310px, 28vw);
  --ring-radius: calc(var(--box-size) / 2 + 78px);
  position: relative;
  width: var(--box-size);
  height: var(--box-size);
  transform-style: preserve-3d;
  transform: rotateX(-14deg);
}

.how-panel {
  position: absolute;
  inset: 0;
  border: 1.6px solid rgb(255 255 255 / 0.22);
  border-radius: 20px;
  background: rgb(22 34 74 / 0.16);
  transition: border-color 0.35s ease, background-color 0.35s ease;
}

/* Mini dot-network per panel (initHowPanelNet): roulette dots + chained
   lines + couriers, drawn in an SVG layer that rides the panel's 3D pose */
.how-panel__net {
  position: absolute;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  overflow: visible;
  pointer-events: none;
}

/* Screen-space layer for the cross-card arcs (initHowPanelNet) */
.how-slider__visual {
  position: relative;
}

.how-net-overlay {
  position: absolute;
  inset: 0;
  z-index: 2;
  width: 100%;
  height: 100%;
  overflow: visible;
  pointer-events: none;
}

.how-panel[data-panel="0"] { transform: rotateY(0deg) translateZ(var(--ring-radius)); }
.how-panel[data-panel="1"] { transform: rotateY(90deg) translateZ(var(--ring-radius)); }
.how-panel[data-panel="2"] { transform: rotateY(180deg) translateZ(var(--ring-radius)); }
.how-panel[data-panel="3"] { transform: rotateY(270deg) translateZ(var(--ring-radius)); }

/* Dotted chords joining the four wall-centre dots.
   The chord for the active step brightens, dashes march toward the next
   wall and a pulse travels along it — same behaviour the old canvas had. */
.how-link {
  position: absolute;
  top: 50%;
  left: 50%;
  width: calc(var(--ring-radius) * 1.41421);
  height: 2px;
  background-image: repeating-linear-gradient(90deg, rgb(245 247 250 / 0.28) 0 4px, transparent 4px 10px);
  transform: translate(-50%, -50%) rotateY(var(--la)) translateZ(calc(var(--ring-radius) * 0.70711));
  opacity: 0.35;
  transition: opacity 0.35s ease;
}

.how-link__pulse {
  position: absolute;
  top: 50%;
  left: 0;
  width: 7px;
  height: 7px;
  margin-top: -3.5px;
  border-radius: 50%;
  background: #8fb4ff;
  box-shadow: 0 0 9px #8fb4ff;
  opacity: 0;
}

.how-diagram[data-step="0"] .how-link[data-link="0"],
.how-diagram[data-step="1"] .how-link[data-link="1"],
.how-diagram[data-step="2"] .how-link[data-link="2"],
.how-diagram[data-step="3"] .how-link[data-link="3"] {
  background-image: repeating-linear-gradient(90deg, var(--slide-accent) 0 4px, transparent 4px 10px);
  opacity: 1;
  animation: how-link-march 0.4s linear infinite;
}

.how-diagram[data-step="0"] .how-link[data-link="0"] .how-link__pulse,
.how-diagram[data-step="1"] .how-link[data-link="1"] .how-link__pulse,
.how-diagram[data-step="2"] .how-link[data-link="2"] .how-link__pulse,
.how-diagram[data-step="3"] .how-link[data-link="3"] .how-link__pulse {
  animation: how-link-travel 1.7s linear infinite;
  animation-delay: var(--pd, 0s);
}

@keyframes how-link-march {
  to { background-position-x: 10px; }
}

@keyframes how-link-travel {
  0% { left: 0; opacity: 0; }
  12% { opacity: 1; }
  88% { opacity: 1; }
  100% { left: calc(100% - 7px); opacity: 0; }
}

.how-panel__label {
  position: absolute;
  z-index: 1; /* stays above the panel's dot-network layer */
  top: 18px;
  left: 20px;
  font: 600 15px Manrope, Arial, sans-serif;
  letter-spacing: 0.07em;
  color: rgb(245 247 250 / 0.5);
  transition: color 0.35s ease;
}

.how-panel__dot {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 14px;
  height: 14px;
  margin: -7px 0 0 -7px;
  border-radius: 50%;
  background: var(--dot);
  box-shadow: 0 0 12px var(--dot);
  animation: how-dot-pulse 2.4s ease-in-out infinite;
  animation-delay: var(--wd, 0s);
}

.how-panel__dot::before {
  position: absolute;
  inset: -4px;
  border: 1.6px solid var(--dot);
  border-radius: 50%;
  animation: how-dot-wave 2.2s ease-out infinite;
  animation-delay: var(--wd, 0s);
  content: "";
}

@keyframes how-dot-pulse {
  0%, 100% { opacity: 0.6; transform: scale(0.92); }
  50% { opacity: 1; transform: scale(1.1); }
}

@keyframes how-dot-wave {
  0% { transform: scale(1); opacity: 0.5; }
  70%, 100% { transform: scale(2.5); opacity: 0; }
}

/* Active step: its wall lights up in the step accent */
.how-diagram[data-step="0"] .how-panel[data-panel="0"],
.how-diagram[data-step="1"] .how-panel[data-panel="1"],
.how-diagram[data-step="2"] .how-panel[data-panel="2"],
.how-diagram[data-step="3"] .how-panel[data-panel="3"] {
  border-color: var(--slide-accent);
  background: rgb(41 121 255 / 0.08);
  box-shadow: 0 0 34px rgb(41 121 255 / 0.14);
}

.how-diagram[data-step="0"] .how-panel[data-panel="0"] .how-panel__label,
.how-diagram[data-step="1"] .how-panel[data-panel="1"] .how-panel__label,
.how-diagram[data-step="2"] .how-panel[data-panel="2"] .how-panel__label,
.how-diagram[data-step="3"] .how-panel[data-panel="3"] .how-panel__label {
  color: rgb(245 247 250 / 0.95);
}

.how-slider__progress {
  display: grid;
  grid-column: 1 / -1;
  grid-template-columns: repeat(4, 1fr);
  gap: 9px;
  align-self: end;
}

.how-slider__progress button {
  position: relative;
  height: 22px;
  padding: 0;
  background: transparent;
  border: 0;
  cursor: pointer;
}

.how-slider__progress button::before,
.how-slider__progress button span {
  position: absolute;
  top: 10px;
  left: 0;
  height: 1px;
  content: "";
}

.how-slider__progress button::before {
  width: 100%;
  background: rgb(255 255 255 / 0.18);
}

.how-slider__progress button span {
  width: 0;
  background: var(--slide-accent);
  transition: background-color 0.4s ease;
}

.how-slider__progress button.is-complete span {
  width: 100%;
}

.how-slider__hint {
  position: absolute;
  right: var(--gutter);
  bottom: 82px;
  margin: 0;
  color: rgb(255 255 255 / 0.34);
  font: 500 10px/1 Manrope, Arial, sans-serif;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.stack {
  z-index: 3;
  padding: 48px 0 28px;
  overflow: visible;
  background: #08090c;
}

.stack__panel {
  display: grid;
  width: calc(100% - 64px);
  max-width: 1840px;
  min-height: 730px;
  margin-inline: auto;
  padding: 40px;
  overflow: visible;
  background: #212228;
  border: 1px solid rgb(255 255 255 / .035);
  border-radius: 18px;
  grid-template-columns: minmax(0, 2.05fr) minmax(360px, .85fr);
  gap: 26px;
}

.stack__main {
  position: relative;
  min-width: 0;
  min-height: 648px;
}

.stack__heading {
  position: relative;
  z-index: 2;
  max-width: 500px;
  padding: 0 0 0 0;
}

.stack__heading h2 {
  margin-bottom: 25px;
  font-size: clamp(38px, 3.15vw, 58px);
  line-height: 1.07;
}

.stack__heading p {
  max-width: 490px;
  margin: 0;
  color: #9b9da2;
  font-size: 15px;
  line-height: 1.6;
}

.stack__media {
  position: absolute;
  z-index: 1;
  inset: 190px 2% 30px 0;
  display: grid;
  place-items: center;
  pointer-events: none;
}

.stack__diagram {
  display: block;
  width: 100%;
  height: 100%;
}

/* Per-card hover lift removed — the WHOLE diagram tilts with the pointer
   instead (initStackTilt). */
.stack__media {
  perspective: 1200px;
}

.stack__diagram {
  transform-style: preserve-3d;
  will-change: transform;
}

/* Arrow trains marching along the stack lanes (Scale-style chevrons).
   Translate = exactly one chevron spacing along the flow direction, so the
   loop is seamless. */
.stack-march {
  animation: stack-march 0.7s linear infinite;
}

@keyframes stack-march {
  to { transform: translate(18.8px, -6.8px); }
}

@media (prefers-reduced-motion: reduce) {
  .stack-march {
    animation: none;
  }
}

/* Cluster names floating above each card group (screen-space, no skew) */
.stack__diagram .stack-cluster-label {
  font: 600 17px Manrope, Arial, sans-serif;
  letter-spacing: 0.01em;
  fill: #3f5ea8; /* brand-tinted, still legible on the white panel */
  transition: fill 0.25s ease;
}

/* Hover một cụm card -> label của cụm đó sáng trắng lên */
.stack__diagram [data-cluster] {
  pointer-events: auto;
}

.stack__diagram .stack-cluster-label.is-lit {
  fill: #2979ff;
}

.stack__diagram .stack-ai {
  font: 700 30px Manrope, Arial, sans-serif;
  letter-spacing: 0.02em;
  filter: drop-shadow(0 0 10px rgb(83 91 255 / 0.55));
}

.stack-diagram__label {
  font: 500 12px Manrope, Arial, sans-serif;
  letter-spacing: 0.08em;
  fill: rgb(245 247 250 / 0.5);
}


.stack__cards {
  position: relative;
  z-index: 2;
  display: grid;
  min-width: 0;
  grid-template-rows: repeat(4, minmax(0, 1fr));
  gap: 8px;
}

.stack-card {
  --mx: 50%;
  --my: 50%;
  /* Resting state is black & white; --card-live is the hue revealed on hover. */
  --card-accent: #6b7280;
  --card-live: #2979ff;
  position: relative;
  display: flex;
  min-height: 0;
  padding: 30px 32px;
  overflow: hidden;
  isolation: isolate;
  flex-direction: column;
  justify-content: space-between;
  background: linear-gradient(168deg, rgb(30 34 48 / 0.95) 0%, rgb(17 21 34 / 0.9) 100%);
  border: 1px solid rgb(255 255 255 / 0.07);
  border-radius: 14px;
  transition: transform 0.25s ease, border-color 0.3s ease, box-shadow 0.3s ease;
  will-change: transform;
}

.stack-card--cloud { --card-live: #535bff; }
.stack-card--models { --card-live: #6a49ff; }
.stack-card--teams { --card-live: #7c4dff; }

/* Hover swaps the greyscale accent for the card's brand hue — every accent
   (hairline, icon chip, border, glow) already reads from --card-accent. */
.stack-card:hover { --card-accent: var(--card-live); }

.stack-card > * {
  position: relative;
  z-index: 1;
}

/* Cursor glow inside the card, tinted per accent */
.stack-card::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  background: radial-gradient(circle 240px at var(--mx) var(--my), color-mix(in srgb, var(--card-accent) 20%, transparent) 0%, transparent 72%);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

/* Accent hairline that slides in along the top edge */
.stack-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  z-index: 1;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--card-accent), transparent 70%);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.45s cubic-bezier(0.16, 1, 0.3, 1);
}

.stack-card:hover {
  border-color: color-mix(in srgb, var(--card-accent) 45%, transparent);
  box-shadow: 0 18px 44px rgb(4 8 22 / 0.5);
}

.stack-card:hover::after {
  opacity: 1;
}

.stack-card:hover::before {
  transform: scaleX(1);
}

.stack-card__head {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
}

/* Icon sits beside the title now, so its own bottom margin is dropped. */
.stack-card__head .stack-card__icon {
  flex: 0 0 auto;
  margin-bottom: 0;
}

.stack-card__icon {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  flex: 0 0 auto;
  color: color-mix(in srgb, var(--card-accent) 72%, #fff);
  background: color-mix(in srgb, var(--card-accent) 13%, transparent);
  border: 1px solid color-mix(in srgb, var(--card-accent) 34%, transparent);
  border-radius: 11px;
  transition: background-color 0.3s ease, border-color 0.3s ease, transform 0.3s ease;
}

.stack-card__icon svg {
  width: 19px;
  height: 19px;
}

.stack-card:hover .stack-card__head {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
}

/* Icon sits beside the title now, so its own bottom margin is dropped. */
.stack-card__head .stack-card__icon {
  flex: 0 0 auto;
  margin-bottom: 0;
}

.stack-card__icon {
  background: color-mix(in srgb, var(--card-accent) 24%, transparent);
  border-color: color-mix(in srgb, var(--card-accent) 62%, transparent);
  transform: translateY(-2px);
}

.stack-card__index {
  position: absolute;
  top: 26px;
  right: 28px;
  color: color-mix(in srgb, var(--card-accent) 46%, transparent);
  font-family: Manrope, Arial, sans-serif;
  font-size: 12px;
  letter-spacing: 0.08em;
  transition: color 0.3s ease;
}

.stack-card:hover .stack-card__index {
  color: color-mix(in srgb, var(--card-accent) 90%, #fff);
}

.stack-card h3 {
  margin: 0;
  font-size: 17.6px;
  line-height: 1.2;
}

.stack-card p {
  max-width: 460px;
  margin: 4px 0 0;
  color: #a4a6ab;
  font-size: 14px;
  line-height: 1.5;
}

.stack-card--cloud .stack-card--models /* ---------- Trust: three assurances ---------- */

.trust {
  overflow: clip;
}

/* Same blueprint grid as the Who section, faded toward the bottom */
.trust::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  -webkit-mask-image: linear-gradient(to bottom, rgb(0 0 0) 0%, rgb(0 0 0 / 0.45) 62%, transparent 100%);
  mask-image: linear-gradient(to bottom, rgb(0 0 0) 0%, rgb(0 0 0 / 0.45) 62%, transparent 100%);
  pointer-events: none;
}

.trust > .container {
  position: relative;
  z-index: 1;
}

.trust__head {
  max-width: 940px;
  margin-bottom: clamp(48px, 5vw, 76px);
}

.trust__head h2 {
  margin-bottom: 0;
  font-size: clamp(30px, 3vw, 46px);
}

.trust__accent {
  background: linear-gradient(90deg, #2979ff 0%, #535bff 45%, #7c4dff 100%);
  background-clip: text;
  -webkit-background-clip: text;
  color: transparent;
}

.trust__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(18px, 1.8vw, 26px);
}

.trust-card {
  --mx: 50%;
  --my: 50%;
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(28px, 2.4vw, 38px);
  background: linear-gradient(168deg, rgb(23 28 42 / 0.92) 0%, rgb(14 23 48 / 0.6) 100%);
  border: 1px solid rgb(255 255 255 / 0.05);
  border-radius: var(--radius);
  transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.35s ease, box-shadow 0.35s ease;
}

.trust-card > * {
  position: relative;
  z-index: 1;
}

/* Pointer glow, sits above the card fill but under the copy */
.trust-card::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  background: radial-gradient(circle 260px at var(--mx) var(--my), rgb(41 121 255 / 0.22) 0%, rgb(83 91 255 / 0.08) 45%, transparent 76%);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.35s ease;
}

.trust-card:hover {
  border-color: rgb(41 121 255 / 0.28);
  box-shadow: 0 22px 48px rgb(5 10 28 / 0.55);
  transform: translateY(-6px);
}

.trust-card:hover::after {
  opacity: 1;
}

/* Border spark — one bright core travelling the full perimeter over a faint
   base line (technique borrowed from the RDAS container-border-animate). */
@property --trust-angle {
  syntax: "<angle>";
  initial-value: 0deg;
  inherits: false;
}

.trust-card::before {
  --_glow: rgb(41 121 255 / 0.75);
  --_core: #cfe0ff;
  --_line: rgb(120 165 255 / 0.16);
  --_spread: 80deg;
  --_mid: calc(360deg - var(--_spread) / 2);
  --_mid2: calc(180deg - var(--_spread) / 2);
  content: "";
  position: absolute;
  inset: 0;
  z-index: 2;
  box-sizing: border-box;
  padding: 1.5px;
  border-radius: inherit;
  background:
    conic-gradient(
      from var(--trust-angle),
      transparent 0deg,
      transparent calc(180deg - var(--_spread)),
      var(--_glow) calc(var(--_mid2) - 10deg),
      var(--_core) var(--_mid2),
      var(--_glow) calc(var(--_mid2) + 10deg),
      transparent 180deg,
      transparent calc(360deg - var(--_spread)),
      var(--_glow) calc(var(--_mid) - 10deg),
      var(--_core) var(--_mid),
      var(--_glow) calc(var(--_mid) + 10deg),
      transparent 360deg
    ),
    linear-gradient(var(--_line) 0 0);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  mask-composite: exclude;
  opacity: 0.9;
  pointer-events: none;
  animation: trust-border-shine 4.2s linear infinite;
}

.trust-card:nth-child(2)::before { animation-duration: 5.4s; }
.trust-card:nth-child(3)::before { animation-duration: 6.6s; }

.trust-card:hover::before {
  opacity: 1;
}

@keyframes trust-border-shine {
  to { --trust-angle: 360deg; }
}

.trust-card__index {
  position: absolute;
  top: clamp(24px, 2.2vw, 32px);
  right: clamp(24px, 2.2vw, 32px);
  color: rgb(143 180 255 / 0.34);
  font-family: Manrope, Arial, sans-serif;
  font-size: 13px;
  letter-spacing: 0.08em;
  transition: color 0.35s ease;
}

.trust-card:hover .trust-card__index {
  color: rgb(143 180 255 / 0.8);
}

.trust-card__icon {
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  margin-bottom: 26px;
  color: #8fb4ff;
  background: rgb(41 121 255 / 0.12);
  border: 1px solid rgb(41 121 255 / 0.32);
  border-radius: 12px;
  transition: background-color 0.35s ease, border-color 0.35s ease, transform 0.35s ease;
}

.trust-card__icon svg {
  width: 21px;
  height: 21px;
}

.trust-card:hover .trust-card__icon {
  background: rgb(41 121 255 / 0.22);
  border-color: rgb(41 121 255 / 0.6);
  transform: translateY(-2px) scale(1.04);
}

.trust-card h3 {
  margin-bottom: 12px;
  font-size: 20px;
}

.trust-card p {
  margin-bottom: 0;
  color: rgb(198 203 212 / 0.86);
  font-size: 15px;
  line-height: 1.7;
}

@media (max-width: 1024px) {
  .trust__grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .trust__head {
    margin-bottom: 36px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .trust-card::before {
    animation: none;
  }

  .trust-card:hover {
    transform: none;
  }
}

.why {
  --mx: 50%;
  --my: 50%;
  z-index: 1;
  overflow: hidden;
  padding-bottom: 0;
  background: #000000;
}

.why__copy {
  position: relative;
  z-index: 2;
  padding-bottom: 0;
}

.why__copy h2 {
  max-width: 940px;
}

/* .why__copy p outranks .eyebrow, so restate the eyebrow inside the section. */
.why__copy .eyebrow {
  max-width: none;
  margin-bottom: 22px;
  color: var(--color-accent);
  font-family: Manrope, Arial, sans-serif;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.why__copy p:last-of-type {
  margin-bottom: 0;
}

.why__copy p {
  max-width: 680px;
  margin-bottom: 32px;
  color: var(--color-muted);
  font-size: 18px;
}

.why__media {
  --mx: 50%;
  --my: 50%;
  position: relative;
  width: 100vw;
  margin-left: calc(50% - 50vw);
  height: clamp(460px, 38vw, 720px);
  margin-top: 0; /* flush with #trust — no sliver of page bg between the two bands */
  overflow: hidden;
  background: #08090c;
}

/* 28/8: tree SVG replaced by looping video (video_circle_icons_v5.mp4) */
.why__video {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
/* Paused at frame 0 until initReveals flips .is-playing on scroll-in, so the
   sequence always starts from the single seed dot instead of mid-cycle. */
.why__media:not(.is-playing) .why__diagram,
.why__media:not(.is-playing) .why__diagram * {
  animation-play-state: paused;
}

/* One-frame kill switch: dropping every animation lets the next .is-playing
   recreate them from 0s, so re-entering the section replays from the seed */
.why__media.is-resetting .why__diagram,
.why__media.is-resetting .why__diagram * {
  animation: none !important;
}

.why__diagram {
  position: relative;
  z-index: 2;
  display: block;
  width: 100%;
  height: 100%;
  animation: why-cycle 26s linear infinite;
}

/* The tree builds up, holds, then the whole thing clears at once and restarts */
@keyframes why-cycle {
  0%, 88% { opacity: 1; }
  93%, 100% { opacity: 0; }
}

/* 16s loop: only the seed shows at first; each generation's dotted lines
   wipe outward and the new dots pop in at their far end. Then it repeats.
   animation-fill-mode: backwards keeps everything hidden during the delay. */
/* Every animation runs the same 16s period with NO delay — the per-generation
   staging lives inside generated keyframes (why-wipe-N / why-pop-N-V, emitted
   in the SVG). Delays desynced from the master cycle on the second loop, which
   made the whole tree reappear at once instead of restarting from one seed. */
.why-gen {
  animation-duration: 26s;
  animation-timing-function: linear;
  animation-iteration-count: infinite;
}

.why-gen--seed {
  animation: none;
}

/* Punchier glow inside the Why tree than the shared Who/Stack vocabulary */
.why__diagram .who-dot {
  filter: drop-shadow(0 0 5px rgb(41 121 255 / 0.55));
}

.why__diagram .who-wave {
  animation: why-wave 2.6s cubic-bezier(0.22, 1, 0.36, 1) infinite;
}

@keyframes why-wave {
  0% { transform: scale(0.85); opacity: 0.55; }
  72%, 100% { transform: scale(3); opacity: 0; }
}

.why-travel {
  offset-rotate: 0deg;
  opacity: 0;
  animation-name: why-travel;
  animation-timing-function: linear;
  animation-iteration-count: infinite;
  animation-fill-mode: backwards;
  filter: drop-shadow(0 0 6px rgb(169 196 255 / 0.95));
}

@keyframes why-travel {
  0% { offset-distance: 0%; opacity: 0; }
  8% { opacity: 1; }
  88% { opacity: 1; }
  100% { offset-distance: 100%; opacity: 0; }
}

/* Nodes drift in a slow, tiny orbit so the tree never feels frozen */
.why-drift {
  animation-name: why-drift;
  animation-timing-function: ease-in-out;
  animation-iteration-count: infinite;
}

@keyframes why-drift {
  0%, 100% { transform: translate(0, 0); }
  25% { transform: translate(4.2px, -3px); }
  50% { transform: translate(1px, 4.4px); }
  75% { transform: translate(-4.4px, 1.6px); }
}

.why-node {
  transform-box: fill-box;
  transform-origin: center;
  animation-duration: 26s;
  animation-timing-function: cubic-bezier(0.22, 1, 0.36, 1);
  animation-iteration-count: infinite;
}

/* Growth pulse: one node seeds the next generation, over and over */
.why-pulse {
  offset-rotate: 0deg;
  opacity: 0;
  animation: why-pulse linear infinite;
  filter: drop-shadow(0 0 5px rgb(143 180 255 / 0.85));
}

@keyframes why-pulse {
  0% { offset-distance: 0%; opacity: 0; }
  12% { opacity: 1; }
  85% { opacity: 1; }
  100% { offset-distance: 100%; opacity: 0; }
}

.security__head {
  margin-bottom: 74px;
}

.security__layout {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: clamp(70px, 10vw, 150px);
}

.security {
  --mx: 50%;
  --my: 50%;
  overflow: clip;
  background: #000000;
}

.security__head,
.security__layout {
  position: relative;
  z-index: 2;
}

.security__planes {
  display: grid;
  place-items: center;
  min-height: 600px;
}

.security__diagram {
  width: min(580px, 100%);
  height: auto;
  overflow: visible;
}

/* Four-beat morph on ONE set of three cards (no cross-fading stages):
   one card → springs apart into three upright cards in a row → merges back
   → bursts out into three overlapping circles → collapses. 20s loop.
   Shape changes ride SVG2 geometry properties (x/y/width/height/rx) so the
   corners and the icons never distort the way a scale() would. */
.sec-card,
.sec-spin,
.sec-shape,
.sec-trace,
.sec-icon {
  animation-duration: 5.5s;
  animation-timing-function: cubic-bezier(0.34, 1.32, 0.4, 1);
  animation-iteration-count: infinite;
}

.sec-card__idle {
  animation: sec-idle 6.4s ease-in-out infinite;
}

@keyframes sec-idle {
  0%, 100% { transform: translateY(-5px); }
  50% { transform: translateY(5px); }
}

.sec-shape {
  fill: rgb(41 121 255 / 0.05);
  stroke: rgb(245 247 250 / 0.32);
  stroke-width: 1;
}

/* Spark running the perimeter, whatever shape the card currently holds */
.sec-trace {
  fill: none;
  stroke: #8fb4ff;
  stroke-width: 1.6;
  stroke-dasharray: 110 900;
  filter: drop-shadow(0 0 7px rgb(143 180 255 / 0.9));
  /* two animations: the geometry morph (20s) plus the marching spark (2.6s);
     the names/durations are set per card in the SVG's inline styles */
  animation-timing-function: cubic-bezier(0.34, 1.32, 0.4, 1), linear;
}

.sec-shape,
.sec-trace {
  transform-box: view-box;
}

@keyframes sec-march {
  to { stroke-dashoffset: -1010; }
}

.sec-icon {
  transform-box: fill-box;
  transform-origin: center;
  fill: none;
  stroke: #8fb4ff;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
  filter: drop-shadow(0 0 8px rgb(41 121 255 / 0.55));
}

.sec-icon rect,
.sec-icon circle,
.sec-icon path {
  fill: none;
  stroke: inherit;
  vector-effect: non-scaling-stroke;
}

/* Shockwave fired at each transition */
.sec-burst {
  fill: none;
  stroke: #6ea3ff;
  stroke-width: 1.4;
  opacity: 0;
  animation: sec-burst 5.5s cubic-bezier(0.16, 1, 0.3, 1) infinite;
}

@media (prefers-reduced-motion: reduce) {
  .sec-card,
  .sec-card__idle,
  .sec-spin,
  .sec-shape,
  .sec-trace,
  .sec-icon,
  .sec-burst {
    animation: none;
  }


}


.security__pillars {
  display: grid;
}

.security__pillars article {
  padding: 28px 0;
  border-bottom: 1px solid var(--color-border);
}

.security__pillars article:first-child {
  padding-top: 0;
}

.security__pillars svg {
  margin-bottom: 18px;
}

.security__pillars h3 {
  font-size: 22px;
}

.security__pillars p {
  max-width: 650px;
  margin-bottom: 0;
  color: var(--color-text);
  font-size: 15px;
}

.final-cta {
  --mx: 50%;
  --my: 50%;
  padding-block: clamp(92px, 10vw, 150px);
  overflow: clip;
  text-align: center;
}

/* Full-bleed background image behind the closing CTA. The scrim keeps the
   headline legible over any photo; it is click-through so the slot's own
   hover/drop controls stay reachable. */
.final-cta > .container {
  position: relative;
  z-index: 2;
}

.final-cta h2 {
  max-width: 680px;
  margin-inline: auto;
  font-size: clamp(30px, 3.4vw, 50px);
}

.final-cta__intro {
  max-width: 620px;
  margin: 18px auto 30px;
  color: var(--color-text);
  font-size: 17px;
  line-height: 1.65;
}

.final-cta__contact {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
  color: var(--color-text);
  font-size: 16px;
}

.final-cta__contact span {
  margin-right: 4px;
  color: var(--color-accent);
  font-weight: 600;
}

.final-cta__contact li {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.final-cta__contact span {
  display: inline-flex;
  margin-right: 0;
}

.final-cta__contact span svg {
  width: 18px;
  height: 18px;
}

.final-cta__contact a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid rgb(41 121 255 / 0.45);
  transition: color 0.2s ease, border-color 0.2s ease;
}

.final-cta__contact a:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.site-footer {
  position: relative;
  padding: 30px 0;
  background: #08090c;
  border-top: 1px solid var(--color-border);
  overflow: clip;
}

/* Gradient hairline + brand glow at the top of the footer removed by request. */

.site-footer > .container {
  position: relative;
  z-index: 1;
}

/* Closing statement row: echoes the CTA and gives the footer a lead line
   instead of the button sitting inside the brand block. */
.site-footer__lead {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 28px;
  flex-wrap: wrap;
  padding-bottom: clamp(36px, 4vw, 54px);
  margin-bottom: clamp(36px, 4vw, 54px);
  border-bottom: 1px solid rgb(255 255 255 / 0.08);
}

.site-footer__statement {
  max-width: 22ch;
  margin: 0;
  color: var(--color-on-primary);
  font-size: clamp(26px, 2.8vw, 38px);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: -0.02em;
}

.site-footer__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.8fr) minmax(0, 0.8fr);
  gap: clamp(48px, 8vw, 140px);
  padding-bottom: 0;
}

.site-footer__brand p {
  max-width: 420px;
  margin: 20px 0 26px;
  color: var(--color-muted);
  font-size: 15px;
  line-height: 1.7;
}

.site-footer__heading {
  margin-bottom: 18px;
  color: rgb(255 255 255 / 0.42);
  font: 500 11px/1 Manrope, Arial, sans-serif;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.site-footer__nav {
  display: grid;
  align-content: start;
  gap: 13px;
}

.site-footer__nav a {
  position: relative;
  width: fit-content;
  padding-left: 0;
  transition: color 0.2s ease, padding-left 0.2s ease;
}

.site-footer__nav a::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--color-accent);
  transition: width 0.2s ease;
}

.site-footer__nav a:hover {
  padding-left: 18px;
}

.site-footer__nav a:hover::before {
  width: 12px;
}

.site-footer__social {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-footer__social a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  color: var(--color-muted);
  border: 1px solid var(--color-border);
  border-radius: 9px;
  transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease, transform 0.2s ease;
}

.site-footer__social a:hover {
  color: var(--color-on-secondary);
  background: rgb(41 121 255 / 0.16);
  border-color: rgb(41 121 255 / 0.55);
  transform: translateY(-2px);
}

.site-footer__social svg {
  width: 16px;
  height: 16px;
}

.site-footer__bottom {
  display: flex;
  align-items: center;
  gap: 20px;
  justify-content: space-between;
  padding-top: 0;
  color: var(--color-muted);
  font: 11px/1.5 Manrope, Arial, sans-serif;
  text-transform: uppercase;
}

.whatsapp-button-shell {
  position: fixed;
  right: var(--floating-action-right);
  bottom: calc(var(--floating-action-bottom) + env(safe-area-inset-bottom));
  z-index: 98;
  width: var(--whatsapp-size);
  height: var(--whatsapp-size);
  transition: transform 0.22s ease;
}

body.back-to-top-visible .whatsapp-button-shell {
  transform: translateY(calc(-1 * (var(--back-to-top-size) + var(--floating-gap))));
}

#whatsapp__button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: var(--whatsapp-size);
  height: var(--whatsapp-size);
  color: #f8fffb;
  background: #25d366;
  border-radius: 50%;
  animation: whatsapp-wave 1s linear infinite;
}

#whatsapp__button svg {
  width: 62%;
  height: 62%;
}

#back-to-top-button {
  position: fixed;
  right: calc(var(--floating-action-right) + (var(--whatsapp-size) - var(--back-to-top-size)) / 2);
  bottom: calc(var(--floating-action-bottom) + env(safe-area-inset-bottom));
  z-index: 97;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: var(--back-to-top-size);
  height: var(--back-to-top-size);
  padding: 0;
  color: var(--color-on-secondary);
  background: var(--color-secondary);
  border: 1px solid rgb(255 255 255 / 0.28);
  border-radius: 50%;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateY(8px);
  transition: opacity 0.22s ease, visibility 0.22s ease, transform 0.22s ease, background-color 0.2s ease;
}

#back-to-top-button svg {
  width: 50%;
  height: 50%;
}

body.back-to-top-visible #back-to-top-button {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateY(0);
}

#back-to-top-button:hover {
  color: var(--color-on-accent);
  background: var(--color-accent);
  transform: translateY(-2px);
}

@keyframes whatsapp-wave {
  from { box-shadow: 0 0 0 0 rgb(37 211 102 / 0.42); }
  to { box-shadow: 0 0 0 10px rgb(37 211 102 / 0); }
}

:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 3px;
}

.reveal,
.reveal-stagger > * {
  opacity: 0;
  transform: translateY(24px);
}

.reveal-stagger.is-revealed > * {
  opacity: 1;
  transform: none;
}

@media (min-width: 768px) and (max-width: 1024px) {
  :root {
    --whatsapp-size: 40px;
    --back-to-top-size: 32px;
  }

  h1 { font-size: 44px; }
  h2 { font-size: 36px; }
  h3 { font-size: 22px; }

  .desktop-nav,
  .desktop-cta {
    display: none;
  }

  .site-header__inner {
    grid-template-columns: 1fr auto;
  }

  .menu-toggle,
  .drawer-close {
    display: inline-flex;
  }

  .who__grid,
  .security__layout {
    grid-template-columns: 1fr 1fr;
    gap: 50px;
  }

  .security__planes {
    min-height: 460px;
  }

  .security__diagram {
    width: min(420px, 100%);
  }

  .how-slider__layout {
    grid-template-columns: minmax(280px, 0.72fr) minmax(440px, 1.28fr);
    grid-template-rows: minmax(0, 1fr) auto;
    column-gap: 34px;
  }

  .how-slider__visual {
    min-height: 500px;
  }

  .how-slide h3 {
    font-size: clamp(36px, 4.4vw, 48px);
  }

  .stack__panel {
    grid-template-columns: 1fr;
    min-height: 0;
  }

  .stack__main {
    min-height: 520px;
  }

  .stack__cards {
    grid-template-rows: repeat(2, minmax(0, 1fr));
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
  }

  .stack__diagram .stack-cluster-label {
    font-size: 16px;
  }
}

@media (max-width: 767px) {
  :root {
    --gutter: 20px;
    --header-height: 64px;
    --floating-action-right: 16px;
    --floating-action-bottom: calc(16px + var(--mobile-navigation-bar-height));
    --whatsapp-size: 32px;
    --back-to-top-size: 28px;
  }

  h1 { font-size: 40px; }
  h2 { font-size: 32px; }
  h3 { font-size: 20px; }

  .site-header__inner {
    grid-template-columns: 1fr auto;
    width: calc(100% - 32px);
  }

  .desktop-nav,
  .desktop-cta {
    display: none;
  }

  .menu-toggle,
  .drawer-close {
    display: inline-flex;
  }

  .section {
    padding: 88px 0;
  }

  /* 27/8: mobile chạy canvas như desktop — các override dưới đây chỉ còn
     áp cho chế độ static (reduced-motion / không có WebGL). */
  .pull-apart[data-mode="static"] {
    height: auto;
    min-height: 0;
  }

  .pull-apart[data-mode="static"] .pull-apart__stage {
    display: grid;
    min-height: 980px;
    padding: 90px 0 80px;
    grid-template-rows: auto minmax(430px, 1fr) auto;
  }

  .pull-apart[data-mode="static"] .pull-apart__canvas {
    display: none;
  }

  .pull-apart[data-mode="static"] .pull-apart__copy,
  .pull-apart[data-mode="static"] .pull-apart__next-copy {
    position: relative;
    top: auto;
    bottom: auto;
    left: auto;
    width: calc(100% - 40px);
    margin-inline: auto;
    opacity: 1;
    transform: none;
  }

  .pull-apart[data-mode="static"] .pull-apart__copy {
    grid-row: 1;
  }

  .pull-apart[data-mode="static"] .pull-apart__next-copy {
    grid-row: 3;
  }

  .pull-apart__copy h1,
  .pull-apart__copy h2,
  .pull-apart__next-copy h2 {
    font-size: 32px;
  }

  .pull-apart[data-mode="static"] .pull-apart__fallback {
    position: relative;
    grid-row: 2;
    display: grid;
    min-height: 430px;
  }

  .pull-apart__fallback-network {
    width: 100%;
    max-width: none;
  }

  .who__grid,
  .security__layout {
    grid-template-columns: 1fr;
  }

  .who__visual {
    min-height: 370px;
  }

  .who__copy {
    grid-row: 1;
  }

  .who__visual {
    grid-row: 2;
  }



  .how {
    height: 460dvh;
    padding: 0;
  }

  .how-slider__layout {
    grid-template-columns: 1fr;
    grid-template-rows: auto minmax(0, 1fr) auto;
    height: 100dvh;
    min-height: 0;
    padding: 92px 0 26px;
  }

  .how-slider__copy {
    min-height: 320px;
    padding-top: 0;
  }

  .how-slider__slides {
    min-height: 220px;
  }

  .how-slide h3 {
    font-size: clamp(38px, 10vw, 50px);
  }

  .how-slider__controls {
    margin-top: 18px;
    padding-bottom: 0;
  }

  .how-slider__visual {
    min-height: 0;
    margin: 12px -14px 0;
  }

  .how-slider__progress {
    grid-row: 3;
    margin-top: 18px;
  }

  .how-slider__hint {
    display: none;
  }

  /* 31/8 mobile: khung carousel to ra, chữ trên panel nhỏ lại, các card
     trong vòng xoay sát nhau hơn */
  .how-box {
    --box-size: min(300px, 60vw);
    --ring-radius: calc(var(--box-size) / 2 + 34px);
  }

  .how-panel__label {
    font-size: 11px;
  }

  .stack__panel {
    grid-template-columns: 1fr;
    min-height: 0;
    width: calc(100% - 24px);
    padding: 18px;
    overflow: hidden;
    border-radius: 14px;
    gap: 18px;
  }

  .stack__main {
    min-height: 420px;
  }

  .stack__heading h2 {
    font-size: 36px;
  }

  .stack__heading p br {
    display: none;
  }

  /* 31/8: diagram giờ cao (~1.65:1) — nới vùng media + phóng label để đọc
     được trên màn hẹp */
  .stack__media {
    inset: 200px 0 10px -12%; /* 31/8: dồn hình sang trái, thẳng mép heading */
  }

  .stack__main {
    min-height: 560px;
  }

  .stack__diagram .stack-cluster-label {
    font-size: 19px; /* mobile: to hơn để đọc được khi SVG bị thu nhỏ */
  }

  .sd-card:hover rect {
    transform: none;
    filter: none;
  }

  .stack__cards {
    grid-template-rows: repeat(4, minmax(190px, auto));
  }

  .stack-card {
    padding: 26px 24px;
  }

  .stack-card:hover {
    transform: none;
  }

  .why__media {
    height: 300px;
    margin-top: 0;
  }

  /* preserveAspectRatio="none" already stretches the tree to the viewport,
     so show all of it rather than cropping the seed off the left edge */
  .why__diagram {
    width: 100%;
    max-width: none;
    margin-left: 0;
  }

  /* Drop the two densest generations on phones: ~96 nodes and ~96 travelling
     dots fewer to animate, and they were unreadable at this size anyway. */
  .why__diagram > g:nth-of-type(n+6) {
    display: none;
  }

  .trust__head h2 {
    font-size: 26px;
  }

  .trust__head h2 br {
    display: none;
  }

  .trust-card {
    padding: 24px 22px;
  }

  .trust-card h3 {
    font-size: 18px;
  }

  .trust-card__index {
    top: 20px;
    right: 20px;
  }

  .trust-card:hover {
    transform: none;
  }

  .final-cta h2 {
    font-size: 28px;
  }

  .security__planes {
    min-height: 340px;
  }

  .security__diagram {
    width: min(360px, 100%);
  }

  .security__pillars article:first-child {
    padding-top: 28px;
  }

  .site-footer__grid {
    grid-template-columns: 1fr;
    gap: 42px;
    padding-bottom: 40px;
  }

  .site-footer__brand p {
    margin: 16px 0 22px;
  }

  .site-footer__lead {
    display: block;
  }

  .site-footer__statement {
    max-width: none;
    margin-bottom: 22px;
    font-size: 24px;
  }

  .site-footer__bottom {
    display: grid;
    gap: 16px;
    justify-items: start;
  }

  /* comfortable touch targets */
  .site-footer__social a {
    width: 38px;
    height: 38px;
  }

  .site-footer__social svg {
    width: 18px;
    height: 18px;
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .button-shine::after {
    display: none;
  }

  .reveal,
  .reveal-stagger > * {
    opacity: 1;
    transform: none;
  }

  .pull-apart {
    height: auto;
    min-height: 0;
  }

  .pull-apart__stage {
    display: grid;
    min-height: 980px;
    padding: 90px 0 80px;
    grid-template-rows: auto minmax(430px, 1fr) auto;
  }

  .pull-apart__canvas {
    display: none;
  }

  .pull-apart__copy,
  .pull-apart__next-copy {
    position: relative;
    top: auto;
    bottom: auto;
    left: auto;
    width: min(900px, calc(100% - 40px));
    margin-inline: auto;
    opacity: 1;
    transform: none;
  }

  .pull-apart__fallback {
    position: relative;
    display: grid;
    min-height: 430px;
  }

  .how {
    height: auto;
    min-height: 100dvh;
  }

  .how-slider__layout {
    position: relative;
    height: auto;
    min-height: 100dvh;
  }

}


/* Collective-experience logo marquee at the foot of the Who section */
.who__logos {
  position: relative;
  z-index: 2;
  min-width: 0;
  max-width: 100%;
  margin-top: clamp(40px, 4vw, 60px);
}

.who__logos .eyebrow {
  margin-bottom: 18px;
}

.who__marquee {
  position: relative;
  min-width: 0;
  max-width: 100%;
  overflow: hidden;
  padding-block: 4px;
  -webkit-mask-image: linear-gradient(90deg, transparent, rgb(0 0 0) 8%, rgb(0 0 0) 84%, transparent);
  mask-image: linear-gradient(90deg, transparent, rgb(0 0 0) 8%, rgb(0 0 0) 84%, transparent);
}

.who__marquee-track {
  --marquee-gap: 16px;
  display: flex;
  width: max-content;
  gap: var(--marquee-gap);
  animation: who-marquee 32s linear infinite;
}

.who__marquee:hover .who__marquee-track,
.who__marquee:focus-within .who__marquee-track {
  animation-play-state: paused;
}

/* Half the track plus half a gap: one full copy of the logos ends with a
   trailing gap that -50% alone does not account for, which hitches the loop. */
@keyframes who-marquee {
  to { transform: translate3d(calc(-50% - (var(--marquee-gap) / 2)), 0, 0); }
}

.who__logo {
  display: grid;
  place-items: center;
  width: 140px;
  height: 64px;
  flex: 0 0 auto;
  color: var(--color-muted);
  background:
    repeating-linear-gradient(135deg, rgb(255 255 255 / 0.045) 0 6px, transparent 6px 12px),
    var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  font-family: Manrope, Arial, sans-serif;
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.who__logo:hover {
  color: var(--color-on-primary);
  border-color: rgb(41 121 255 / 0.5);
}

@media (max-width: 767px) {
  .who__logo { width: 138px; height: 62px; }
  .who__marquee-track { --marquee-gap: 14px; animation-duration: 28s; }
}

@media (prefers-reduced-motion: reduce) {
  .who__marquee-track { animation: none; }
  .who__marquee { overflow-x: auto; }
}


/* ---------- Own the stack: intro + card mosaic ---------- */
.own__layout {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  gap: clamp(32px, 4vw, 72px);
  align-items: stretch;
}

/* Left column matches the cards column: the terrain takes the slack. */
.own__intro {
  display: flex;
  min-height: 0;
  flex-direction: column;
}

.own__intro h2 {
  max-width: 16ch;
}

/* Signature logo-gradient hairline — the section's only gradient */
.own__intro h2::before {
  content: "";
  display: block;
  width: 56px;
  height: 2px;
  margin-bottom: 22px;
  background: linear-gradient(90deg, #2979ff, #7c4dff);
  border-radius: 2px;
}

.own__intro > p {
  max-width: 46ch;
  margin-bottom: 0;
  color: var(--color-text);
  font-size: 16px;
}

.own__media {
  display: grid;
  place-items: stretch;
  flex: 1 1 auto;
  min-height: 260px;
  margin-top: clamp(36px, 4vw, 64px);
  overflow: hidden;
}

/* Real-time procedural contour terrain (js/contour-terrain.js) */
.own__terrain {
  width: 100%;
  height: 100%;
  min-height: 300px;
  overflow: hidden;
  background: #ffffff;
  border-radius: var(--radius);
}

.own__terrain canvas {
  display: block;
}

.own__cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.own-card {
  --card-accent: #9aa1ad;
  position: relative;
  display: flex;
  min-height: 300px;
  flex-direction: column;
  justify-content: space-between;
  padding: 26px 28px;
  overflow: hidden;
  background: var(--color-surface-raised);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: border-color 0.3s ease, background-color 0.3s ease;
}

.own-card { --card-live: #2979ff; }
.own-card--cloud { --card-live: #535bff; }
.own-card--models { --card-live: #7c4dff; }
.own-card:hover { --card-accent: var(--card-live); }

/* Corner accent: a plus mark drawn from two hairlines */
.own-card::after {
  content: "";
  position: absolute;
  top: 22px;
  right: 24px;
  width: 13px;
  height: 13px;
  background:
    linear-gradient(var(--card-accent), var(--card-accent)) center / 100% 1.5px no-repeat,
    linear-gradient(var(--card-accent), var(--card-accent)) center / 1.5px 100% no-repeat;
  opacity: 0.85;
  transition: opacity 0.3s ease, background-size 0.3s ease;
}

.own-card:hover::after {
  background-size: 100% 1.5px, 1.5px 100%;
}

.own-card:hover {
  /* 1/9: glow xanh bám theo con trỏ thay vì phủ đều cả card */
  background:
    radial-gradient(240px circle at var(--mx, 50%) var(--my, 50%),
      color-mix(in srgb, var(--card-accent) 13%, transparent), transparent 72%),
    var(--color-surface-raised);
  border-color: color-mix(in srgb, var(--card-accent) 45%, transparent);
}

.own-card:hover::after {
  opacity: 1;
}

.own-card h3 {
  max-width: 14ch;
  margin: 0;
  padding-right: 28px;
  font-size: 21px;
}

.own-card p {
  margin: 0;
  color: #a4a6ab;
  font-size: 14px;
  line-height: 1.5;
  text-wrap: pretty;
}

/* Third card carries the row on its own */
.own-card--models {
  grid-column: 1 / -1;
  min-height: 210px;
}

.own-card--models h3 { max-width: none; }
.own-card--models p { max-width: 62ch; }

@media (max-width: 1024px) {
  .own__layout {
    grid-template-columns: 1fr;
  }

  .own__media {
    flex: 0 0 auto;
    aspect-ratio: 16 / 9;
    min-height: 0;
  }
}

@media (max-width: 767px) {
  .own__cards {
    grid-template-columns: 1fr;
  }

  .own-card,
  .own-card--models {
    min-height: 0;
  }

  .own-card p {
    margin-top: 18px;
  }
}


/* 1/9: cỡ chữ outro positioning theo yêu cầu client; heading luôn 1 hàng
   (font tự co theo bề ngang màn để không bao giờ xuống hàng) */
.pull-apart__next-copy {
  width: max-content;
  max-width: calc(100% - 24px);
}

.pull-apart__next-copy h2 {
  white-space: nowrap;
  font-size: min(36px, 2.55vw);
}

.pull-apart__next-copy p {
  font-size: 28px;
}

@media (max-width: 1024px) {
  .pull-apart__next-copy h2 {
    font-size: min(32px, 2.55vw);
  }

  .pull-apart__next-copy p {
    font-size: 24px;
  }
}

@media (max-width: 767px) {
  .pull-apart__next-copy h2 {
    font-size: min(28px, 2.5vw);
  }

  .pull-apart__next-copy p {
    font-size: 20px;
  }
}


/* 1/9: logo thật thay placeholder — full show, không padding */
.who__logo {
  background: #ffffff;
  padding: 0;
  overflow: hidden;
}

.who__logo img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
  /* logo hiện màu gốc luôn, không cần hover */
}


/* 1/9: câu đầu đoạn stack giữ 1 hàng trên desktop/tablet */
.stack__heading p,
.stack__heading div {
  max-width: none;
}

.nowrap-line {
  white-space: nowrap;
}

@media (max-width: 767px) {
  .nowrap-line {
    white-space: normal;
  }
}


/* 1/9: vòng đáy stack ẩn lúc đầu, chỉ hiện khi dot chạy về tới logo */
.stack-loop-hidden {
  visibility: hidden;
}





/* 1/9: bỏ khoảng rỗng giữa title và mô tả trong own-card — text đi liền
   ngay dưới heading */
.own-card {
  min-height: 200px;
  justify-content: flex-start;
  gap: 14px;
}

.own-card--models {
  min-height: 150px;
}


/* 1/9: chuẩn hoá padding section: 80 / 60 / 40 */
.section {
  padding: 80px 0;
}

@media (max-width: 1024px) {
  .section {
    padding: 60px 0;
  }
}

@media (max-width: 767px) {
  .section {
    padding: 40px 0;
  }
}


/* 1/9: nền band đồng màu với canvas (#000) — hết 2 dải xám hai bên */
.why__media {
  background: #000;
}

/* 1/9: growing-lines canvas thay video ở band Why — thu vào giữa band */
.why__media #growing-lines {
  display: block;
  width: min(1240px, 92%);
  height: 100%;
  margin-inline: auto;
  background: #000;
}