:root {
  --ink: #0d0e0f;
  --muted: #5d6269;
  --paper: #fbfbf7;
  --soft: #f1f0ea;
  --line: rgba(13, 14, 15, 0.12);
  --dark: #070707;
  --white: #ffffff;
  --green: #1c9b70;
  --gold: #c9902c;
  --cyan: #267ea8;
  --shadow: 0 30px 90px rgba(12, 14, 16, 0.14);
  --max: 1180px;
  --wide: 1440px;
  --nav: 74px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Aptos", "Microsoft YaHei UI", "PingFang SC", "Noto Sans CJK SC", sans-serif;
  font-size: 18px;
  line-height: 1.62;
  letter-spacing: 0;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  pointer-events: none;
  opacity: 0.48;
  background:
    linear-gradient(90deg, rgba(10, 10, 10, 0.035) 1px, transparent 1px),
    linear-gradient(180deg, rgba(10, 10, 10, 0.035) 1px, transparent 1px);
  background-size: 58px 58px;
  mask-image: linear-gradient(to bottom, #000, transparent 78%);
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.nowrap { white-space: nowrap; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  height: var(--nav);
  backdrop-filter: blur(24px);
  background: rgba(251, 251, 247, 0.86);
  border-bottom: 1px solid rgba(13, 14, 15, 0.08);
}

.nav {
  max-width: var(--wide);
  height: 100%;
  margin: 0 auto;
  padding: 0 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 850;
  white-space: nowrap;
}

.brand-mark {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  background: linear-gradient(145deg, #141414, #444 40%, #f1eee4 41%, #fff 48%, #171717 49%);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.18), 0 10px 28px rgba(0, 0, 0, 0.18);
}

.nav-links {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  flex-wrap: wrap;
}

.nav-links a {
  padding: 8px 11px;
  border-radius: 999px;
  color: #343840;
  font-size: 14px;
  font-weight: 750;
  transition: background 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.nav-links a:hover,
.nav-links a.active {
  color: #fff;
  background: #111;
  transform: translateY(-1px);
}

.nav-cta {
  display: inline-flex;
  min-height: 40px;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  padding: 9px 15px;
  background: #111;
  color: #fff;
  font-size: 14px;
  font-weight: 850;
  white-space: nowrap;
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.16);
}

.page-hero {
  position: relative;
  min-height: 520px;
  display: grid;
  align-items: end;
  padding: 96px 28px 62px;
  color: #fff;
  background: #070707;
  overflow: hidden;
}

.page-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(0, 0, 0, 0.78), rgba(0, 0, 0, 0.48) 48%, rgba(0, 0, 0, 0.18)),
    url("hero-ai-os.png") center / cover no-repeat;
  transform: scale(1.035);
}

.page-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.06) 1px, transparent 1px),
    linear-gradient(180deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 70px 70px;
  mask-image: linear-gradient(90deg, #000, transparent 78%);
}

.hero-inner,
.section-inner,
.footer-inner {
  width: min(var(--max), calc(100vw - 56px));
  margin: 0 auto;
}

.wide {
  width: min(var(--wide), calc(100vw - 56px));
}

.page-hero .hero-inner {
  position: relative;
  z-index: 2;
}

.eyebrow,
.section-kicker {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin-bottom: 16px;
  color: rgba(255, 255, 255, 0.78);
  font-size: 14px;
  font-weight: 850;
  text-transform: uppercase;
}

.section-kicker {
  color: #3b4148;
}

.eyebrow::before,
.section-kicker::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 18px 0 0 var(--gold), 36px 0 0 var(--cyan);
}

.page-hero h1 {
  max-width: 980px;
  margin: 0 0 22px;
  font-size: clamp(48px, 6vw, 92px);
  line-height: 1.04;
  letter-spacing: 0;
}

.page-hero p {
  max-width: 850px;
  margin: 0;
  color: rgba(255, 255, 255, 0.78);
  font-size: clamp(20px, 2vw, 28px);
}

section {
  padding: 94px 28px;
  scroll-margin-top: calc(var(--nav) + 18px);
}

.section-head {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(300px, 0.44fr);
  gap: 46px;
  align-items: end;
  margin-bottom: 42px;
}

h2 {
  margin: 0;
  font-size: clamp(38px, 4vw, 64px);
  line-height: 1.1;
  letter-spacing: 0;
}

.section-note {
  margin: 0;
  color: var(--muted);
  font-size: 20px;
}

.grid-2,
.grid-3,
.grid-4 {
  display: grid;
  gap: 16px;
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card {
  min-height: 240px;
  padding: 26px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: #fff;
  display: grid;
  gap: 14px;
  align-content: start;
  box-shadow: 0 18px 46px rgba(14, 15, 15, 0.06);
}

.card.dark {
  background: #111;
  color: #fff;
  border-color: rgba(255, 255, 255, 0.14);
}

.card h3 {
  margin: 0;
  font-size: 24px;
  line-height: 1.26;
}

.card p,
.card li {
  margin: 0;
  color: var(--muted);
  font-size: 17px;
}

.card.dark p,
.card.dark li {
  color: rgba(255, 255, 255, 0.72);
}

.card ul {
  margin: 0;
  padding-left: 18px;
}

.card li a {
  display: inline-flex;
  min-height: 34px;
  align-items: center;
  padding: 4px 0;
}

.placeholder {
  border-style: dashed;
  background: rgba(255, 255, 255, 0.58);
}

.placeholder b {
  display: inline-flex;
  width: max-content;
  min-height: 30px;
  align-items: center;
  padding: 5px 10px;
  border-radius: 999px;
  background: #efede5;
  font-size: 13px;
}

.media-band {
  position: relative;
  min-height: 420px;
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: #111;
  box-shadow: var(--shadow);
}

.media-band img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.timeline {
  display: grid;
  gap: 12px;
}

.timeline-item {
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 18px;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.timeline-item b {
  font-size: 20px;
}

.timeline-item p {
  margin: 0;
  color: var(--muted);
}

.contact-panel {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 18px;
  align-items: stretch;
}

.form-shell {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  padding: 26px;
  display: grid;
  gap: 14px;
}

.form-shell label {
  display: grid;
  gap: 7px;
  color: #343840;
  font-weight: 750;
}

.form-shell input,
.form-shell textarea,
.form-shell select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px 13px;
  font: inherit;
  background: #fafaf7;
  color: var(--ink);
}

.form-shell textarea {
  min-height: 130px;
  resize: vertical;
}

.button {
  display: inline-flex;
  min-height: 50px;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: 999px;
  padding: 12px 22px;
  border: 1px solid #111;
  background: #111;
  color: #fff;
  font-weight: 850;
  font-size: 16px;
  cursor: pointer;
}

.button.secondary {
  background: transparent;
  color: #111;
}

.cta-band {
  background: #070707;
  color: #fff;
}

.cta-band .section-note,
.cta-band .section-kicker {
  color: rgba(255, 255, 255, 0.72);
}

footer {
  padding: 32px 28px;
  background: #030303;
  color: rgba(255, 255, 255, 0.62);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  flex-wrap: wrap;
  font-size: 14px;
}

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.in-view {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 1080px) {
  .section-head,
  .contact-panel {
    grid-template-columns: 1fr;
  }

  .grid-3,
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 760px) {
  :root { --nav: auto; }

  body { font-size: 16px; }

  .site-header { height: auto; }

  .nav {
    padding: 14px 18px;
    align-items: flex-start;
    flex-direction: column;
    gap: 12px;
  }

  .nav-links { justify-content: flex-start; }

  .nav-links a,
  .nav-cta {
    font-size: 13px;
  }

  .page-hero {
    min-height: 520px;
    padding: 72px 18px 40px;
  }

  .page-hero h1 { font-size: 42px; }
  .page-hero p, .section-note { font-size: 18px; }

  section { padding: 68px 18px; }

  .hero-inner,
  .section-inner,
  .footer-inner,
  .wide {
    width: min(100%, calc(100vw - 36px));
  }

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

  .timeline-item {
    grid-template-columns: 1fr;
  }

  .media-band {
    min-height: 300px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}

/* Bright product-site finish for overseas launch */
:root {
  --ink: #1d1d1f;
  --muted: #6e6e73;
  --paper: #ffffff;
  --soft: #f5f5f7;
  --line: rgba(29, 29, 31, 0.12);
  --dark: #f5f5f7;
  --green: #34c759;
  --gold: #ff9f0a;
  --cyan: #0071e3;
  --shadow: 0 28px 72px rgba(0, 0, 0, 0.10);
}

body {
  background: #fff;
  color: var(--ink);
}

body::before {
  opacity: 0.24;
  background:
    linear-gradient(90deg, rgba(29, 29, 31, 0.035) 1px, transparent 1px),
    linear-gradient(180deg, rgba(29, 29, 31, 0.035) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: linear-gradient(to bottom, #000, transparent 56%);
}

.site-header {
  background: rgba(255, 255, 255, 0.82);
  border-bottom-color: rgba(29, 29, 31, 0.10);
}

.brand-mark {
  background: conic-gradient(from 220deg, #0071e3, #34c759, #ff9f0a, #0071e3);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.38), 0 12px 30px rgba(0, 113, 227, 0.20);
}

.eyebrow::before,
.section-kicker::before {
  flex: 0 0 auto;
  box-shadow: none;
  margin-right: 2px;
}

h1,
h2,
h3,
p,
.button,
.nav-links a {
  overflow-wrap: anywhere;
}

.nav-links a {
  color: #1d1d1f;
}

.nav-links a:hover,
.nav-links a.active,
.nav-cta,
.button {
  background: #0071e3;
  border-color: #0071e3;
  color: #fff;
  box-shadow: 0 12px 28px rgba(0, 113, 227, 0.22);
}

.button.secondary {
  background: rgba(0, 113, 227, 0.08);
  border-color: rgba(0, 113, 227, 0.18);
  color: #0066cc;
  box-shadow: none;
}

.page-hero {
  min-height: 560px;
  align-items: center;
  padding: 104px 28px 72px;
  color: var(--ink);
  background: linear-gradient(180deg, #fff 0%, #f5f5f7 100%);
}

.page-hero::before {
  inset: 112px max(28px, calc((100vw - var(--wide)) / 2 + 28px)) 72px 56%;
  border: 1px solid rgba(29, 29, 31, 0.10);
  border-radius: 32px;
  background: url("hero-ai-os.png") center / cover no-repeat;
  box-shadow: 0 38px 90px rgba(0, 0, 0, 0.14);
  transform: none;
}

.page-hero::after {
  background:
    linear-gradient(90deg, rgba(29, 29, 31, 0.045) 1px, transparent 1px),
    linear-gradient(180deg, rgba(29, 29, 31, 0.04) 1px, transparent 1px);
  background-size: 92px 92px;
  mask-image: linear-gradient(180deg, transparent, #000 20%, transparent 82%);
}

.page-hero .hero-inner {
  width: min(var(--wide), calc(100vw - 56px));
}

.eyebrow,
.page-hero p,
.section-note,
.card p,
.card li,
footer {
  color: var(--muted);
}

.page-hero h1 {
  max-width: 760px;
  font-size: 72px;
  color: var(--ink);
}

.page-hero p {
  max-width: 720px;
  font-size: 25px;
}

h2 {
  font-size: 54px;
}

.card,
.card.dark,
.contact-panel,
.media-band {
  border-color: rgba(29, 29, 31, 0.10);
  background: rgba(255, 255, 255, 0.88);
  color: var(--ink);
  box-shadow: 0 22px 58px rgba(0, 0, 0, 0.07);
}

.media-band {
  border-radius: 30px;
}

.cta-band {
  background: #f5f5f7;
  color: var(--ink);
}

.cta-band .section-note,
.cta-band .section-kicker {
  color: var(--muted);
}

footer {
  background: #f5f5f7;
  border-top-color: rgba(29, 29, 31, 0.10);
}

@media (max-width: 1080px) {
  .page-hero::before {
    display: none;
  }

  .page-hero h1 {
    font-size: 58px;
  }

  h2 {
    font-size: 46px;
  }
}

@media (max-width: 760px) {
  .page-hero {
    padding: 72px 18px 44px;
  }

  .nav {
    align-items: stretch;
  }

  .nav-links {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    width: 100%;
    gap: 8px;
  }

  .nav-links a {
    padding: 8px 6px;
    text-align: center;
  }

  .page-hero .hero-inner {
    width: min(100%, calc(100vw - 36px));
  }

  .page-hero h1 {
    max-width: 100%;
    font-size: 42px;
    line-height: 1.08;
    word-break: break-all;
  }

  .page-hero p,
  .section-note {
    font-size: 19px;
  }

  h2 {
    font-size: 36px;
  }
}

/* System expansion pages */
.product-nav {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 24px;
}

.product-nav a,
.pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 38px;
  padding: 8px 14px;
  border-radius: 999px;
  background: rgba(0, 113, 227, 0.08);
  border: 1px solid rgba(0, 113, 227, 0.16);
  color: #0066cc;
  font-size: 14px;
  font-weight: 850;
}

.system-split {
  display: grid;
  grid-template-columns: minmax(0, 0.84fr) minmax(360px, 0.58fr);
  gap: 18px;
  align-items: stretch;
}

.system-panel,
.feature-tile,
.package-card,
.decision-card,
.roadmap-card {
  border: 1px solid rgba(29, 29, 31, 0.10);
  border-radius: 26px;
  background: rgba(255, 255, 255, 0.9);
  box-shadow: 0 22px 58px rgba(0, 0, 0, 0.07);
}

.system-panel {
  padding: 30px;
  min-height: 420px;
  display: grid;
  align-content: start;
  gap: 18px;
}

.system-panel.hero-card {
  background: linear-gradient(145deg, #fff, #f5f9ff);
}

.system-panel h3,
.feature-tile h3,
.package-card h3,
.decision-card h3,
.roadmap-card h3 {
  margin: 0;
  font-size: 28px;
  line-height: 1.18;
}

.system-panel p,
.feature-tile p,
.package-card p,
.decision-card p,
.roadmap-card p {
  margin: 0;
  color: var(--muted);
}

.system-panel ul,
.feature-tile ul,
.package-card ul,
.decision-card ul,
.roadmap-card ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 9px;
  color: var(--muted);
}

.system-panel li,
.feature-tile li,
.package-card li,
.decision-card li,
.roadmap-card li {
  position: relative;
  padding-left: 18px;
}

.system-panel li::before,
.feature-tile li::before,
.package-card li::before,
.decision-card li::before,
.roadmap-card li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #34c759;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.feature-tile,
.decision-card,
.roadmap-card {
  min-height: 250px;
  padding: 26px;
  display: grid;
  gap: 14px;
  align-content: start;
}

.feature-tile b,
.decision-card b,
.roadmap-card b {
  color: #0066cc;
  font-size: 14px;
  text-transform: uppercase;
}

.package-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.package-card {
  min-height: 520px;
  padding: 28px;
  display: grid;
  grid-template-rows: auto auto 1fr auto;
  gap: 18px;
}

.package-card.featured {
  border-color: rgba(0, 113, 227, 0.28);
  background: linear-gradient(145deg, #fff, #eef6ff);
  box-shadow: 0 28px 70px rgba(0, 113, 227, 0.14);
}

.package-price {
  font-size: 18px;
  color: var(--muted);
  font-weight: 850;
}

.package-price b {
  display: block;
  color: var(--ink);
  font-size: 42px;
  line-height: 1.1;
}

.decision-grid,
.roadmap-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.comparison-table {
  overflow: hidden;
  border-radius: 26px;
  border: 1px solid rgba(29, 29, 31, 0.10);
  background: rgba(255, 255, 255, 0.92);
  box-shadow: 0 22px 58px rgba(0, 0, 0, 0.07);
}

.comparison-row {
  display: grid;
  grid-template-columns: 0.7fr 1fr 1fr;
  gap: 0;
  border-bottom: 1px solid rgba(29, 29, 31, 0.09);
}

.comparison-row:last-child {
  border-bottom: 0;
}

.comparison-row > div {
  padding: 20px 22px;
  border-right: 1px solid rgba(29, 29, 31, 0.09);
}

.comparison-row > div:last-child {
  border-right: 0;
}

.comparison-head {
  background: #f5f5f7;
  font-weight: 900;
}

.comparison-row p {
  margin: 0;
  color: var(--muted);
}

@media (max-width: 1080px) {
  .system-split,
  .feature-grid,
  .package-grid,
  .decision-grid,
  .roadmap-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  .system-panel,
  .feature-tile,
  .package-card,
  .decision-card,
  .roadmap-card {
    border-radius: 22px;
    padding: 22px;
  }

  .comparison-row {
    grid-template-columns: 1fr;
  }

  .comparison-row > div {
    border-right: 0;
    border-bottom: 1px solid rgba(29, 29, 31, 0.08);
  }

  .comparison-row > div:last-child {
    border-bottom: 0;
  }
}

/* CPQ deep page, FAQ and demo experience */
.conversion-strip {
  position: relative;
  width: min(var(--max), calc(100vw - 36px));
  margin: 30px auto 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 14px 16px 14px 22px;
  border-radius: 999px;
  border: 1px solid rgba(0, 113, 227, 0.16);
  background: rgba(255, 255, 255, 0.86);
  backdrop-filter: blur(22px);
  box-shadow: 0 20px 58px rgba(0, 0, 0, 0.10);
}

.conversion-strip span {
  color: var(--muted);
  font-weight: 750;
}

.conversion-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.cpq-flow {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 12px;
}

.cpq-step {
  min-height: 190px;
  padding: 22px;
  border-radius: 24px;
  border: 1px solid rgba(29, 29, 31, 0.10);
  background: rgba(255, 255, 255, 0.92);
  box-shadow: 0 18px 48px rgba(0, 0, 0, 0.06);
  display: grid;
  align-content: start;
  gap: 10px;
}

.cpq-step b {
  color: #0066cc;
  font-size: 13px;
  text-transform: uppercase;
}

.cpq-step h3 {
  margin: 0;
  font-size: 21px;
  line-height: 1.2;
}

.cpq-step p {
  margin: 0;
  color: var(--muted);
}

.demo-shell {
  display: grid;
  grid-template-columns: minmax(0, 0.82fr) minmax(380px, 0.58fr);
  gap: 18px;
  align-items: start;
}

.demo-panel,
.quote-card,
.faq-item {
  border: 1px solid rgba(29, 29, 31, 0.10);
  border-radius: 28px;
  background: rgba(255, 255, 255, 0.92);
  box-shadow: 0 22px 58px rgba(0, 0, 0, 0.07);
}

.demo-panel {
  padding: 28px;
  display: grid;
  gap: 18px;
}

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

.demo-form label {
  display: grid;
  gap: 8px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 850;
}

.demo-form select,
.demo-form input[type="range"] {
  width: 100%;
}

.demo-form select {
  min-height: 46px;
  border-radius: 14px;
  border: 1px solid rgba(29, 29, 31, 0.14);
  background: #fff;
  padding: 0 13px;
  color: var(--ink);
  font: inherit;
}

.quote-card {
  padding: 28px;
  display: grid;
  gap: 18px;
}

.quote-price {
  padding: 22px;
  border-radius: 22px;
  background: linear-gradient(145deg, #0071e3, #4aa3ff);
  color: #fff;
}

.quote-price span {
  display: block;
  opacity: 0.82;
  font-weight: 850;
  text-transform: uppercase;
}

.quote-price b {
  display: block;
  font-size: clamp(28px, 2.8vw, 40px);
  line-height: 1.08;
  margin-top: 8px;
  white-space: nowrap;
}

.quote-list {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.quote-list li {
  padding: 12px 14px;
  border-radius: 16px;
  background: #f5f5f7;
  color: var(--muted);
}

.faq-list {
  display: grid;
  gap: 14px;
}

.faq-item {
  padding: 0;
  overflow: hidden;
}

.faq-item summary {
  cursor: pointer;
  padding: 22px 24px;
  font-size: 20px;
  font-weight: 900;
  color: var(--ink);
  list-style: none;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: "+";
  float: right;
  color: #0071e3;
}

.faq-item[open] summary::after {
  content: "-";
}

.faq-item p {
  margin: 0;
  padding: 0 24px 24px;
  color: var(--muted);
}

/* ROI calculator, proof system and briefing mode */
.roi-hero::before,
.briefing-hero::before {
  background-image: url("architecture-ai-os.png");
}

.roi-shell {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(420px, 0.55fr);
  gap: 18px;
  align-items: start;
}

.roi-panel,
.roi-output,
.proof-card,
.briefing-mode,
.briefing-stage,
.briefing-step {
  border: 1px solid rgba(29, 29, 31, 0.10);
  border-radius: 28px;
  background: rgba(255, 255, 255, 0.92);
  box-shadow: 0 22px 58px rgba(0, 0, 0, 0.07);
}

.roi-panel,
.roi-output {
  padding: 28px;
}

.roi-panel h3,
.roi-output h3 {
  margin: 0 0 18px;
  font-size: 24px;
}

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

.roi-form label {
  display: grid;
  gap: 8px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 850;
}

.roi-form input {
  width: 100%;
  min-height: 46px;
  border: 1px solid rgba(29, 29, 31, 0.14);
  border-radius: 14px;
  background: #fff;
  color: var(--ink);
  font: inherit;
  padding: 0 13px;
}

.roi-form input[type="range"] {
  min-height: auto;
  padding: 0;
  accent-color: #0071e3;
}

.roi-output {
  position: sticky;
  top: calc(24px + var(--nav));
  display: grid;
  gap: 18px;
}

.roi-main-number {
  padding: 24px;
  border-radius: 24px;
  background: linear-gradient(145deg, #0071e3, #62b1ff);
  color: #fff;
}

.roi-main-number span,
.roi-main-number small {
  display: block;
  opacity: 0.86;
  font-weight: 850;
}

.roi-main-number b {
  display: block;
  margin: 8px 0;
  font-size: clamp(38px, 5vw, 64px);
  line-height: 1;
  letter-spacing: 0;
}

.roi-result-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
}

.roi-result-grid div {
  padding: 16px;
  border-radius: 18px;
  background: #f5f5f7;
}

.roi-result-grid span {
  display: block;
  color: var(--muted);
  font-size: 13px;
  font-weight: 850;
}

.roi-result-grid b {
  display: block;
  margin-top: 4px;
  font-size: 21px;
  line-height: 1.2;
}

.roi-brief {
  padding: 18px;
  border-radius: 20px;
  border: 1px solid rgba(0, 113, 227, 0.14);
  background: rgba(0, 113, 227, 0.06);
}

.roi-brief p {
  margin: 0;
  color: var(--muted);
}

.proof-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.proof-card {
  padding: 26px;
  display: grid;
  gap: 18px;
}

.proof-card b,
.briefing-mode span {
  color: #0066cc;
  font-size: 13px;
  font-weight: 900;
  text-transform: uppercase;
}

.proof-card h3,
.briefing-mode h3,
.briefing-step h3 {
  margin: 0;
  font-size: 26px;
  line-height: 1.16;
}

.proof-card p,
.briefing-mode p,
.briefing-step p {
  margin: 0;
  color: var(--muted);
}

.proof-metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.proof-metrics span {
  min-height: 74px;
  padding: 12px;
  border-radius: 16px;
  background: #f5f5f7;
  color: var(--ink);
  font-size: 14px;
  font-weight: 850;
  display: grid;
  align-content: center;
}

.briefing-mode-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}

.briefing-mode {
  padding: 30px;
  display: grid;
  gap: 16px;
}

.briefing-mode ol {
  margin: 0;
  padding-left: 22px;
  color: var(--muted);
}

.briefing-mode li {
  margin: 6px 0;
}

.briefing-mode .is-selected,
.button.is-selected {
  background: #1d1d1f;
  border-color: #1d1d1f;
  color: #fff;
}

.briefing-stage {
  padding: 30px;
  display: flex;
  justify-content: space-between;
  gap: 22px;
  align-items: end;
  margin-bottom: 18px;
}

.briefing-stage h2 {
  margin-bottom: 10px;
}

.briefing-stage p {
  margin: 0;
  max-width: 780px;
  color: var(--muted);
}

.briefing-toolbar {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.briefing-agenda {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 12px;
}

.briefing-step {
  padding: 22px;
  display: grid;
  align-content: start;
  gap: 12px;
  min-height: 260px;
}

.briefing-step b {
  width: 42px;
  height: 42px;
  display: inline-grid;
  place-items: center;
  border-radius: 50%;
  background: rgba(0, 113, 227, 0.10);
  color: #0066cc;
}

html:fullscreen .site-header {
  display: none;
}

html:fullscreen .page-hero {
  min-height: 100vh;
}

/* Solution and implementation system pages */
.solution-hero::before,
.implementation-hero::before {
  opacity: 0.84;
}

.solution-board {
  display: grid;
  grid-template-columns: minmax(360px, 0.92fr) minmax(0, 1.08fr);
  gap: 28px;
  align-items: center;
}

.solution-list {
  display: grid;
  gap: 16px;
}

.solution-list .card b,
.solution-card span,
.roadmap-card span,
.decision-card b,
.check-card b,
.metric-step span {
  color: #0066cc;
  font-size: 13px;
  font-weight: 900;
  text-transform: uppercase;
}

.solution-orbit {
  position: relative;
  min-height: 560px;
  border-radius: 38px;
  overflow: hidden;
  background:
    radial-gradient(circle at 50% 48%, rgba(0, 113, 227, 0.20), transparent 28%),
    radial-gradient(circle at 24% 22%, rgba(28, 155, 112, 0.14), transparent 24%),
    radial-gradient(circle at 78% 76%, rgba(201, 144, 44, 0.14), transparent 28%),
    linear-gradient(145deg, rgba(255, 255, 255, 0.92), rgba(245, 247, 251, 0.72));
  border: 1px solid rgba(13, 14, 15, 0.10);
  box-shadow: var(--shadow);
  display: grid;
  place-items: center;
  perspective: 900px;
}

.solution-orbit::before {
  content: "";
  position: absolute;
  width: 78%;
  aspect-ratio: 1;
  border-radius: 50%;
  background:
    conic-gradient(from 0deg, rgba(0, 113, 227, 0.00), rgba(0, 113, 227, 0.26), rgba(28, 155, 112, 0.18), rgba(201, 144, 44, 0.20), rgba(0, 113, 227, 0.00));
  filter: blur(0.3px);
  animation: solutionRotate 18s linear infinite;
}

.orbit-ring {
  position: absolute;
  border: 1px solid rgba(0, 113, 227, 0.22);
  border-radius: 50%;
  transform: rotateX(66deg) rotateZ(-8deg);
}

.ring-one {
  width: 72%;
  aspect-ratio: 1;
  animation: solutionTilt 8s ease-in-out infinite alternate;
}

.ring-two {
  width: 50%;
  aspect-ratio: 1;
  border-color: rgba(28, 155, 112, 0.22);
  animation: solutionTilt 9s ease-in-out infinite alternate-reverse;
}

.orbit-core {
  position: relative;
  z-index: 2;
  width: 134px;
  height: 134px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: linear-gradient(145deg, #0071e3, #004b99);
  color: #fff;
  font-size: 28px;
  font-weight: 950;
  box-shadow: 0 28px 70px rgba(0, 113, 227, 0.30);
}

.solution-orbit span {
  position: absolute;
  left: 50%;
  top: 50%;
  z-index: 3;
  width: 94px;
  min-height: 48px;
  margin: -24px 0 0 -47px;
  border-radius: 999px;
  display: grid;
  place-items: center;
  background: rgba(255, 255, 255, 0.84);
  border: 1px solid rgba(13, 14, 15, 0.10);
  box-shadow: 0 18px 46px rgba(0, 0, 0, 0.10);
  color: #0d0e0f;
  font-size: 15px;
  font-weight: 900;
  transform: rotate(var(--angle)) translateX(205px) rotate(calc(-1 * var(--angle)));
  animation: orbitFloat 5s ease-in-out infinite alternate;
}

.solution-card,
.check-card,
.metric-step,
.roadmap-card,
.decision-card {
  border-radius: 28px;
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid rgba(13, 14, 15, 0.10);
  box-shadow: 0 22px 70px rgba(12, 14, 16, 0.08);
}

.solution-card,
.check-card {
  min-height: 260px;
  padding: 26px;
  display: grid;
  align-content: start;
  gap: 14px;
}

.solution-card h3,
.check-card h3,
.metric-step h3,
.roadmap-card h3,
.decision-card h3 {
  margin: 0;
  font-size: 25px;
  line-height: 1.18;
}

.solution-card p,
.check-card p,
.metric-step p,
.roadmap-card li,
.decision-card p {
  margin: 0;
  color: var(--muted);
}

.decision-grid,
.implementation-roadmap,
.metric-ladder {
  display: grid;
  gap: 18px;
}

.decision-grid {
  grid-template-columns: repeat(3, 1fr);
}

.decision-card {
  padding: 28px;
  display: grid;
  gap: 16px;
  align-content: start;
}

.decision-card .button {
  width: fit-content;
}

.implementation-roadmap {
  grid-template-columns: repeat(3, 1fr);
}

.roadmap-card {
  min-height: 520px;
  padding: 30px;
  display: grid;
  align-content: start;
  gap: 16px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.90), rgba(248, 250, 255, 0.74)),
    radial-gradient(circle at top right, rgba(0, 113, 227, 0.12), transparent 34%);
}

.roadmap-card b {
  font-size: clamp(44px, 5vw, 72px);
  line-height: 0.95;
  letter-spacing: 0;
  color: #111;
}

.roadmap-card ul {
  margin: 0;
  padding-left: 20px;
}

.roadmap-card li {
  margin: 9px 0;
}

.metric-ladder {
  grid-template-columns: repeat(6, 1fr);
}

.metric-step {
  min-height: 240px;
  padding: 24px;
  display: grid;
  gap: 12px;
  align-content: start;
}

@keyframes solutionRotate {
  to { transform: rotate(360deg); }
}

@keyframes solutionTilt {
  to { transform: rotateX(62deg) rotateZ(10deg) scale(1.02); }
}

@keyframes orbitFloat {
  to { translate: 0 -8px; }
}

/* Video, audience, trial and conversion upgrades */
.video-player-shell,
.trial-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(360px, 0.85fr);
  gap: 24px;
  align-items: stretch;
}

.video-player-shell {
  min-height: 680px;
  padding: 18px;
  border-radius: 36px;
  background: #0a0f18;
  box-shadow: 0 36px 110px rgba(0, 0, 0, 0.20);
}

.video-screen {
  position: relative;
  min-height: 640px;
  border-radius: 28px;
  overflow: hidden;
  background:
    radial-gradient(circle at 62% 42%, rgba(0, 113, 227, 0.34), transparent 32%),
    radial-gradient(circle at 34% 68%, rgba(52, 199, 89, 0.20), transparent 28%),
    linear-gradient(145deg, #101827, #05070d);
  color: #fff;
  display: grid;
  align-items: end;
  padding: 36px;
}

.video-screen::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.07) 1px, transparent 1px),
    linear-gradient(180deg, rgba(255, 255, 255, 0.06) 1px, transparent 1px);
  background-size: 66px 66px;
  mask-image: radial-gradient(circle at 52% 45%, #000, transparent 74%);
}

.video-orbit {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  transform-style: preserve-3d;
}

.video-orbit::before,
.video-orbit::after {
  content: "";
  position: absolute;
  width: min(78%, 620px);
  aspect-ratio: 1;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.22);
  transform: rotateX(68deg) rotateZ(18deg);
  animation: videoRing 13s linear infinite;
}

.video-orbit::after {
  width: min(58%, 460px);
  border-color: rgba(52, 199, 89, 0.28);
  animation-duration: 18s;
  animation-direction: reverse;
}

.video-core {
  position: relative;
  z-index: 2;
  width: 150px;
  height: 150px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: linear-gradient(145deg, #0071e3, #5bb6ff);
  color: #fff;
  font-size: 30px;
  font-weight: 950;
  box-shadow: 0 0 80px rgba(0, 113, 227, 0.45);
}

.video-orbit i {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 88px;
  min-height: 46px;
  margin: -23px 0 0 -44px;
  border-radius: 999px;
  display: grid;
  place-items: center;
  background: rgba(255, 255, 255, 0.90);
  color: #0066cc;
  font-style: normal;
  font-weight: 900;
  transform: rotate(calc(var(--i) * 60deg)) translateX(232px) rotate(calc(var(--i) * -60deg));
  animation: videoNode 4s ease-in-out infinite alternate;
  animation-delay: calc(var(--i) * -0.35s);
}

.video-caption {
  position: relative;
  z-index: 4;
  max-width: 760px;
}

.video-caption b,
.video-control-panel .section-kicker,
.audience-card span,
.trial-checks b {
  color: #72b7ff;
  font-size: 13px;
  font-weight: 900;
  text-transform: uppercase;
}

.video-caption h2 {
  margin: 8px 0 12px;
  font-size: clamp(42px, 5vw, 76px);
  line-height: 1;
  color: #fff;
}

.video-caption p {
  margin: 0;
  max-width: 680px;
  color: rgba(255, 255, 255, 0.78);
  font-size: 22px;
}

.video-control-panel {
  border-radius: 28px;
  padding: 30px;
  background: rgba(255, 255, 255, 0.95);
  display: grid;
  gap: 20px;
  align-content: start;
}

.video-control-panel h2 {
  margin-bottom: 10px;
  font-size: clamp(34px, 4vw, 48px);
}

.video-progress {
  height: 10px;
  border-radius: 999px;
  background: rgba(0, 113, 227, 0.10);
  overflow: hidden;
}

.video-progress span {
  display: block;
  width: 0%;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, #0071e3, #34c759);
  transition: width 0.3s ease;
}

.video-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.video-chapters {
  display: grid;
  gap: 10px;
}

.video-chapters button {
  min-height: 66px;
  border: 1px solid rgba(0, 113, 227, 0.14);
  border-radius: 18px;
  background: #f5f5f7;
  display: grid;
  grid-template-columns: 44px 1fr;
  align-items: center;
  gap: 12px;
  padding: 12px;
  text-align: left;
  color: #1d1d1f;
  font: inherit;
  font-weight: 900;
  cursor: pointer;
}

.video-chapters button.active {
  background: #0071e3;
  color: #fff;
}

.video-chapters b {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.86);
  color: #0066cc;
  display: grid;
  place-items: center;
}

.audience-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.audience-card {
  min-height: 340px;
  padding: 28px;
  border-radius: 28px;
  border: 1px solid rgba(13, 14, 15, 0.10);
  background: rgba(255, 255, 255, 0.86);
  box-shadow: 0 22px 70px rgba(12, 14, 16, 0.08);
  display: grid;
  gap: 14px;
  align-content: start;
}

.audience-card span,
.trial-checks b {
  color: #0066cc;
}

.audience-card h3,
.trial-checks h3 {
  margin: 0;
  font-size: 25px;
  line-height: 1.18;
}

.audience-card p,
.trial-checks p {
  margin: 0;
  color: var(--muted);
}

.audience-card .section-actions {
  margin-top: auto;
}

.trial-readiness {
  padding: 34px;
  border-radius: 34px;
  background:
    radial-gradient(circle at 80% 14%, rgba(0, 113, 227, 0.14), transparent 28%),
    linear-gradient(145deg, #fff, #f5f8fc);
  border: 1px solid rgba(13, 14, 15, 0.10);
  box-shadow: var(--shadow);
}

.trial-checks {
  display: grid;
  gap: 14px;
  margin-top: 24px;
}

.trial-checks article {
  padding: 22px;
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.80);
  border: 1px solid rgba(13, 14, 15, 0.08);
}

.trial-form {
  scroll-margin-top: calc(var(--nav) + 28px);
}

.floating-cta-dock {
  position: fixed;
  right: 22px;
  bottom: 22px;
  z-index: 70;
  display: flex;
  gap: 8px;
  padding: 8px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid rgba(0, 113, 227, 0.16);
  box-shadow: 0 18px 48px rgba(0, 0, 0, 0.13);
  backdrop-filter: blur(20px);
}

.floating-cta-dock a {
  min-height: 40px;
  padding: 0 14px;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 900;
  color: #0066cc;
}

.floating-cta-dock a:first-child {
  background: #0071e3;
  color: #fff;
}

@keyframes videoRing {
  to { transform: rotateX(68deg) rotateZ(378deg); }
}

@keyframes videoNode {
  to { translate: 0 -12px; }
}

@media (max-width: 1180px) {
  .solution-board,
  .implementation-roadmap,
  .decision-grid,
  .metric-ladder,
  .video-player-shell,
  .trial-layout,
  .audience-grid {
    grid-template-columns: 1fr;
  }

  .solution-orbit {
    min-height: 480px;
  }

  .cpq-flow {
    grid-template-columns: repeat(2, 1fr);
  }

  .demo-shell {
    grid-template-columns: 1fr;
  }

  .roi-shell,
  .briefing-mode-grid {
    grid-template-columns: 1fr;
  }

  .roi-output {
    position: static;
  }

  .briefing-agenda {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 760px) {
  .site-header {
    height: auto;
  }

  .nav {
    min-height: var(--nav);
    padding: 12px 18px;
    flex-wrap: wrap;
    align-items: center;
    gap: 10px;
  }

  .brand span:last-child {
    font-size: 17px;
  }

  .nav-cta {
    margin-left: auto;
    min-height: 38px;
    padding: 8px 13px;
    font-size: 13px;
  }

  .nav-links {
    order: 3;
    width: 100%;
    display: flex;
    flex-wrap: nowrap;
    justify-content: flex-start;
    gap: 8px;
    overflow-x: auto;
    padding: 2px 1px 4px;
    scrollbar-width: none;
    mask-image: linear-gradient(90deg, #000 0 88%, transparent);
  }

  .nav-links::-webkit-scrollbar {
    display: none;
  }

  .nav-links a {
    flex: 0 0 auto;
    min-height: 36px;
    padding: 8px 12px;
    text-align: center;
    background: rgba(0, 113, 227, 0.07);
    border: 1px solid rgba(0, 113, 227, 0.12);
    font-size: 13px;
  }

  .page-hero {
    min-height: auto;
    padding: 48px 18px 42px;
  }

  .page-hero h1 {
    width: min(100%, 340px);
    max-width: 340px;
    font-size: clamp(30px, 8vw, 34px);
    line-height: 1.08;
    white-space: normal;
    word-break: break-all;
    overflow-wrap: anywhere;
    line-break: anywhere;
  }

  .page-hero p,
  .product-nav {
    width: min(100%, 340px);
    max-width: 340px;
  }

  section {
    padding: 64px 18px;
  }

  .hero-inner,
  .section-inner,
  .footer-inner,
  .wide {
    width: min(100%, calc(100vw - 36px));
  }

  .product-nav .button,
  .section-actions .button,
  .button {
    width: 100%;
  }

  .product-nav a {
    flex: 1 1 100%;
  }

  .solution-orbit {
    min-height: 360px;
    border-radius: 24px;
  }

  .orbit-core {
    width: 104px;
    height: 104px;
    font-size: 23px;
  }

  .solution-orbit span {
    width: 78px;
    min-height: 40px;
    margin: -20px 0 0 -39px;
    font-size: 13px;
    transform: rotate(var(--angle)) translateX(128px) rotate(calc(-1 * var(--angle)));
  }

  .solution-card,
  .check-card,
  .metric-step,
  .roadmap-card,
  .decision-card,
  .audience-card,
  .trial-readiness,
  .video-player-shell,
  .video-screen,
  .video-control-panel {
    border-radius: 22px;
    padding: 22px;
    min-height: auto;
  }

  .video-player-shell {
    gap: 14px;
  }

  .video-screen {
    min-height: 500px;
  }

  .video-orbit i {
    transform: rotate(calc(var(--i) * 60deg)) translateX(138px) rotate(calc(var(--i) * -60deg));
  }

  .video-actions,
  .audience-card .section-actions {
    grid-template-columns: 1fr;
  }

  .floating-cta-dock {
    display: none;
  }

  .conversion-strip {
    position: static;
    border-radius: 24px;
    align-items: stretch;
    flex-direction: column;
  }

  .conversion-actions {
    justify-content: stretch;
  }

  .conversion-actions .button {
    width: 100%;
  }

  .cpq-flow,
  .demo-form,
  .roi-form,
  .proof-grid,
  .briefing-agenda {
    grid-template-columns: 1fr;
  }

  .demo-panel,
  .quote-card,
  .roi-panel,
  .roi-output,
  .proof-card,
  .briefing-mode,
  .briefing-stage,
  .briefing-step {
    border-radius: 22px;
    padding: 22px;
  }

  .roi-result-grid,
  .proof-metrics {
    grid-template-columns: 1fr;
  }

  .briefing-stage {
    align-items: stretch;
    flex-direction: column;
  }

  .briefing-toolbar .button {
    width: 100%;
  }

  .quote-price b {
    font-size: 28px;
  }
}