:root {
  --ink: #17102b;
  --ink-soft: #2b2046;
  --violet: #6b42c7;
  --violet-light: #a685ef;
  --amber: #f1ad31;
  --amber-light: #ffd982;
  --pearl: #f8f5ef;
  --paper: #fdfbf7;
  --white: #ffffff;
  --muted: #716b7c;
  --line: rgba(23, 16, 43, 0.14);
  --radius-lg: 3.25rem;
  --radius-md: 2rem;
  --shadow: 0 28px 80px rgba(23, 16, 43, 0.12);
  --max-width: 1220px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 7rem;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Avenir Next", "Century Gothic", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.7;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body.menu-open {
  overflow: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

button,
summary,
a {
  -webkit-tap-highlight-color: transparent;
}

button {
  font: inherit;
}

::selection {
  background: var(--amber-light);
  color: var(--ink);
}

:focus-visible {
  outline: 3px solid var(--amber);
  outline-offset: 4px;
}

.skip-link {
  position: fixed;
  left: 1.25rem;
  top: 1rem;
  z-index: 200;
  padding: 0.65rem 1rem;
  border-radius: 999px;
  background: var(--amber);
  color: var(--ink);
  font-weight: 700;
  transform: translateY(-180%);
  transition: transform 160ms ease;
}

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

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(calc(100% - 3rem), var(--max-width));
  min-height: 5rem;
  margin: 1rem auto 0;
  padding: 0.65rem 0.8rem 0.65rem 1rem;
  border: 1px solid rgba(255, 255, 255, 0.75);
  border-radius: 1.5rem;
  background: rgba(253, 251, 247, 0.86);
  box-shadow: 0 12px 44px rgba(23, 16, 43, 0.08);
  backdrop-filter: blur(18px);
  transition: min-height 180ms ease, box-shadow 180ms ease;
}

.site-header.is-scrolled {
  min-height: 4.5rem;
  box-shadow: 0 16px 50px rgba(23, 16, 43, 0.14);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  min-width: 12.5rem;
}

.brand-mark {
  display: grid;
  width: 2.8rem;
  height: 2.8rem;
  place-items: center;
  border-radius: 0.9rem 1.25rem 0.9rem 1.25rem;
  background: var(--ink);
  color: var(--amber-light);
  font-size: 1.18rem;
  font-weight: 800;
  line-height: 1;
  transform: rotate(-3deg);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand-text strong {
  font-size: 0.97rem;
  letter-spacing: 0.05em;
}

.brand-text span {
  margin-top: 0.25rem;
  color: var(--muted);
  font-size: 0.66rem;
  letter-spacing: 0.34em;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 0.2rem;
}

.site-nav a {
  position: relative;
  padding: 0.65rem 0.85rem;
  color: #3c3550;
  font-size: 0.9rem;
  font-weight: 600;
}

.site-nav a:not(.nav-cta)::after {
  content: "";
  position: absolute;
  right: 0.85rem;
  bottom: 0.35rem;
  left: 0.85rem;
  height: 2px;
  border-radius: 2px;
  background: var(--amber);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 180ms ease;
}

.site-nav a:hover::after,
.site-nav a:focus-visible::after {
  transform: scaleX(1);
}

.site-nav .nav-cta {
  margin-left: 0.35rem;
  padding: 0.7rem 1.25rem;
  border-radius: 999px;
  background: var(--ink);
  color: var(--white);
  transition: background 180ms ease, transform 180ms ease;
}

.site-nav .nav-cta:hover {
  background: var(--violet);
  transform: translateY(-2px);
}

.menu-toggle {
  display: none;
  width: 3rem;
  height: 3rem;
  padding: 0;
  border: 0;
  border-radius: 1rem;
  background: var(--ink);
  cursor: pointer;
}

.menu-toggle span {
  display: block;
  width: 1.15rem;
  height: 2px;
  margin: 0.28rem auto;
  border-radius: 2px;
  background: var(--white);
  transition: transform 180ms ease;
}

.menu-toggle[aria-expanded="true"] span:first-child {
  transform: translateY(3px) rotate(45deg);
}

.menu-toggle[aria-expanded="true"] span:last-child {
  transform: translateY(-3px) rotate(-45deg);
}

.hero {
  position: relative;
  min-height: 100vh;
  padding: 10.5rem max(1.5rem, calc((100vw - var(--max-width)) / 2)) 3rem;
  overflow: hidden;
  background:
    radial-gradient(circle at 8% 16%, rgba(241, 173, 49, 0.15), transparent 22rem),
    linear-gradient(180deg, #fbf8f2 0%, #f5f0e8 100%);
}

.hero::before {
  content: "";
  position: absolute;
  top: 16%;
  left: -6rem;
  width: 10rem;
  height: 25rem;
  border: 1px solid rgba(107, 66, 199, 0.2);
  border-radius: 50%;
  transform: rotate(28deg);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(420px, 0.98fr);
  gap: clamp(2rem, 5vw, 5.5rem);
  align-items: center;
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
}

.eyebrow,
.section-kicker {
  margin: 0 0 1.4rem;
  color: var(--violet);
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.24em;
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 0.7rem;
}

.eyebrow span {
  display: inline-block;
  width: 2.8rem;
  height: 2px;
  background: var(--amber);
}

.hero h1,
.section h2,
.method h2,
.closing h2 {
  margin: 0;
  font-weight: 780;
  letter-spacing: -0.055em;
  line-height: 1.03;
}

.hero h1 {
  font-size: clamp(3.6rem, 7.1vw, 6.85rem);
}

.hero h1 em,
.closing h2 em {
  color: var(--violet);
  font-style: normal;
}

.hero-lead {
  max-width: 39rem;
  margin: 2.2rem 0 0;
  color: #5c5667;
  font-size: clamp(1rem, 1.5vw, 1.15rem);
  line-height: 1.9;
}

.hero-actions,
.closing-actions {
  display: flex;
  align-items: center;
  gap: 1.6rem;
  margin-top: 2.4rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 1.3rem;
  min-height: 3.5rem;
  padding: 0.8rem 1.4rem 0.8rem 1.6rem;
  border-radius: 999px;
  font-weight: 750;
  line-height: 1.2;
  transition: transform 180ms ease, box-shadow 180ms ease, background 180ms ease;
}

.button span {
  display: grid;
  width: 2rem;
  height: 2rem;
  place-items: center;
  border-radius: 50%;
}

.button:hover {
  transform: translateY(-3px);
}

.button-primary {
  background: var(--ink);
  color: var(--white);
  box-shadow: 0 14px 30px rgba(23, 16, 43, 0.2);
}

.button-primary span {
  background: var(--amber);
  color: var(--ink);
}

.button-primary:hover {
  box-shadow: 0 18px 36px rgba(23, 16, 43, 0.28);
}

.text-link,
.closing-link {
  border-bottom: 1px solid currentColor;
  color: var(--ink);
  font-weight: 700;
}

.text-link span,
.closing-link span {
  display: inline-block;
  margin-left: 0.35rem;
  transition: transform 180ms ease;
}

.text-link:hover span {
  transform: translateY(3px);
}

.hero-poster {
  position: relative;
  min-height: 42rem;
  border-radius: 46% 46% 2.5rem 2.5rem / 20% 20% 2.5rem 2.5rem;
  background: var(--ink);
  box-shadow: 0 35px 80px rgba(23, 16, 43, 0.22);
  isolation: isolate;
  overflow: hidden;
}

.hero-poster::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -2;
  opacity: 0.35;
  background-image:
    linear-gradient(rgba(255,255,255,.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.08) 1px, transparent 1px);
  background-size: 3rem 3rem;
  mask-image: linear-gradient(to bottom, black, transparent 90%);
}

.hero-poster::after {
  content: "";
  position: absolute;
  z-index: -1;
  right: -7rem;
  bottom: -9rem;
  width: 27rem;
  height: 27rem;
  border-radius: 42% 58% 63% 37% / 55% 32% 68% 45%;
  background: #3a2467;
  transform: rotate(20deg);
}

.poster-ribbon {
  position: absolute;
  inset: 2rem auto auto 50%;
  z-index: -1;
  width: 105%;
  height: 90%;
  transform: translateX(-50%);
  filter: drop-shadow(0 22px 30px rgba(0,0,0,.2));
}

.poster-orbit {
  position: absolute;
  z-index: 0;
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: 50%;
}

.poster-orbit-one {
  top: 8.5rem;
  left: 5%;
  width: 90%;
  height: 30rem;
  transform: rotate(-16deg);
}

.poster-orbit-two {
  top: 12rem;
  left: 20%;
  width: 64%;
  height: 24rem;
  transform: rotate(24deg);
}

.poster-core {
  position: absolute;
  top: 50%;
  left: 50%;
  z-index: 2;
  display: flex;
  width: 13rem;
  height: 13rem;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(255, 255, 255, 0.5);
  border-radius: 50%;
  background: rgba(23, 16, 43, 0.86);
  color: var(--white);
  box-shadow: inset 0 0 0 0.7rem rgba(255,255,255,.04), 0 22px 46px rgba(23,16,43,.35);
  text-align: center;
  transform: translate(-50%, -50%);
  backdrop-filter: blur(8px);
}

.poster-core span {
  margin-bottom: 0.4rem;
  color: var(--amber-light);
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.25em;
}

.poster-core strong {
  font-size: 2.25rem;
  letter-spacing: 0.05em;
  line-height: 1.18;
}

.poster-tag {
  position: absolute;
  z-index: 3;
  display: flex;
  align-items: center;
  gap: 0.55rem;
  min-width: 6rem;
  padding: 0.7rem 1rem;
  border: 1px solid rgba(255,255,255,.58);
  border-radius: 999px;
  background: rgba(248, 245, 239, 0.9);
  color: var(--ink);
  font-size: 0.82rem;
  font-weight: 750;
  box-shadow: 0 12px 24px rgba(23,16,43,.2);
  backdrop-filter: blur(10px);
}

.poster-tag i {
  width: 0.48rem;
  height: 0.48rem;
  border-radius: 50%;
  background: var(--violet);
}

.tag-brand { top: 22%; left: 8%; }
.tag-product { top: 16%; right: 7%; }
.tag-channel { right: 6%; bottom: 24%; }
.tag-user { bottom: 17%; left: 8%; }
.tag-product i,
.tag-user i { background: var(--amber); }

.poster-note {
  position: absolute;
  right: 2rem;
  bottom: 1.75rem;
  left: 2rem;
  display: flex;
  align-items: center;
  color: rgba(255, 255, 255, 0.65);
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0.16em;
}

.poster-note b {
  flex: 1;
  height: 1px;
  margin: 0 0.75rem;
  background: rgba(255,255,255,.25);
}

.hero-index {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  max-width: var(--max-width);
  margin: 3rem auto 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.hero-index div {
  display: grid;
  grid-template-columns: auto 1fr;
  column-gap: 1rem;
  padding: 1.5rem clamp(1rem, 2vw, 2rem);
  border-right: 1px solid var(--line);
}

.hero-index div:last-child {
  border-right: 0;
}

.hero-index span {
  grid-row: 1 / 3;
  color: var(--violet);
  font-size: 0.75rem;
  font-weight: 800;
}

.hero-index strong {
  font-size: 0.98rem;
}

.hero-index p {
  margin: 0.12rem 0 0;
  color: var(--muted);
  font-size: 0.78rem;
  line-height: 1.4;
}

.section {
  width: min(calc(100% - 3rem), var(--max-width));
  margin: 0 auto;
  padding: clamp(6rem, 10vw, 9rem) 0;
}

.section-heading {
  display: grid;
  grid-template-columns: 1fr 0.45fr;
  column-gap: 4rem;
  align-items: end;
}

.section-heading .section-kicker {
  grid-column: 1 / -1;
}

.section h2,
.method h2,
.closing h2 {
  font-size: clamp(2.6rem, 5.4vw, 5rem);
}

.section-heading > p:last-child,
.process-heading > p {
  margin: 0;
  color: var(--muted);
}

.capability-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25rem;
  margin-top: 4rem;
}

.capability-card {
  position: relative;
  min-height: 28rem;
  padding: clamp(1.7rem, 3vw, 2.7rem);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: transform 220ms ease, box-shadow 220ms ease;
}

.capability-card:hover {
  box-shadow: var(--shadow);
  transform: translateY(-6px);
}

.card-amber {
  background: var(--amber-light);
}

.card-pearl {
  border: 1px solid rgba(23, 16, 43, 0.1);
  background: var(--white);
}

.card-violet {
  background: var(--violet);
  color: var(--white);
}

.card-outline {
  border: 1px solid rgba(248, 245, 239, 0.18);
  background: var(--ink);
  color: var(--white);
}

.card-outline::after {
  content: "";
  position: absolute;
  right: -5rem;
  bottom: -7rem;
  width: 18rem;
  height: 18rem;
  border: 1px solid rgba(255,255,255,.18);
  border-radius: 44% 56% 60% 40%;
  box-shadow: 0 0 0 2rem rgba(255,255,255,.025), 0 0 0 4rem rgba(255,255,255,.02);
}

.card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.74rem;
  font-weight: 800;
}

.card-symbol {
  display: grid;
  width: 3.4rem;
  height: 3.4rem;
  place-items: center;
  border: 1px solid currentColor;
  border-radius: 50%;
  font-size: 1.25rem;
}

.capability-card h3 {
  margin: 4.2rem 0 0.75rem;
  font-size: clamp(2rem, 3.3vw, 3.2rem);
  letter-spacing: -0.04em;
  line-height: 1.1;
}

.capability-card > p {
  max-width: 31rem;
  margin: 0;
  opacity: 0.76;
}

.capability-card ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 2rem 0 0;
  padding: 0;
  list-style: none;
}

.capability-card li {
  padding: 0.48rem 0.8rem;
  border: 1px solid currentColor;
  border-radius: 999px;
  font-size: 0.75rem;
  line-height: 1.2;
  opacity: 0.74;
}

.method {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 0.75fr) minmax(520px, 1.25fr);
  gap: clamp(3rem, 8vw, 8rem);
  align-items: center;
  min-height: 58rem;
  padding: clamp(6rem, 10vw, 9rem) max(1.5rem, calc((100vw - var(--max-width)) / 2));
  overflow: hidden;
  background: var(--ink);
  color: var(--white);
}

.method::before {
  content: "";
  position: absolute;
  top: -8rem;
  left: 22%;
  width: 24rem;
  height: 24rem;
  border-radius: 43% 57% 32% 68%;
  background: rgba(107, 66, 199, 0.18);
  filter: blur(2px);
}

.section-kicker-light {
  color: var(--amber-light);
}

.method-intro {
  position: relative;
  z-index: 2;
}

.method-intro > p:last-child {
  max-width: 35rem;
  margin: 2rem 0 0;
  color: rgba(255,255,255,.64);
}

.method-stage {
  position: relative;
  min-height: 42rem;
}

.method-rings {
  position: absolute;
  inset: 50% auto auto 50%;
  width: min(38rem, 52vw);
  aspect-ratio: 1;
  transform: translate(-50%, -50%);
}

.method-rings span {
  position: absolute;
  border: 1px solid rgba(255,255,255,.19);
  border-radius: 50%;
}

.method-rings span:nth-child(1) { inset: 0; }
.method-rings span:nth-child(2) { inset: 14%; border-color: rgba(166,133,239,.5); }
.method-rings span:nth-child(3) { inset: 28%; border-color: rgba(241,173,49,.65); }

.method-rings::before,
.method-rings::after {
  content: "";
  position: absolute;
  z-index: 2;
  width: 0.65rem;
  height: 0.65rem;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 0 0.4rem rgba(241,173,49,.12);
}

.method-rings::before { top: 13%; left: 23%; }
.method-rings::after { right: 13%; bottom: 27%; background: var(--violet-light); }

.method-center {
  position: absolute;
  top: 50%;
  left: 50%;
  z-index: 3;
  display: flex;
  width: 11rem;
  height: 11rem;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--amber);
  color: var(--ink);
  text-align: center;
  transform: translate(-50%, -50%);
}

.method-center small {
  font-size: 0.67rem;
  font-weight: 800;
  letter-spacing: 0.18em;
}

.method-center strong {
  margin-top: 0.4rem;
  font-size: 1.7rem;
  line-height: 1.15;
}

.method-point {
  position: absolute;
  z-index: 4;
  width: 12.5rem;
  padding: 1.1rem 1.2rem;
  border: 1px solid rgba(255,255,255,.16);
  border-radius: 1.2rem;
  background: rgba(43, 32, 70, 0.85);
  backdrop-filter: blur(12px);
}

.method-point span {
  color: var(--amber-light);
  font-size: 0.66rem;
  font-weight: 800;
  letter-spacing: 0.16em;
}

.method-point h3 {
  margin: 0.25rem 0;
  font-size: 1.1rem;
}

.method-point p {
  margin: 0;
  color: rgba(255,255,255,.58);
  font-size: 0.76rem;
  line-height: 1.55;
}

.point-one { top: 5%; left: 4%; }
.point-two { top: 23%; right: 1%; }
.point-three { bottom: 3%; left: 13%; }

.process {
  padding-bottom: clamp(7rem, 12vw, 11rem);
}

.process-heading {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 0.42fr;
  gap: 4rem;
  align-items: end;
}

.process-list {
  margin: 5rem 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
  list-style: none;
}

.process-list li {
  display: grid;
  grid-template-columns: 5rem minmax(0, 1fr) auto;
  gap: 2rem;
  align-items: center;
  padding: 2rem 1rem;
  border-bottom: 1px solid var(--line);
  transition: padding 180ms ease, background 180ms ease;
}

.process-list li:hover {
  padding-right: 1.5rem;
  padding-left: 1.5rem;
  background: rgba(241,173,49,.08);
}

.step-number {
  color: var(--violet);
  font-size: 0.74rem;
  font-weight: 800;
}

.process-list h3 {
  margin: 0 0 0.25rem;
  font-size: 1.42rem;
  line-height: 1.2;
}

.process-list p {
  margin: 0;
  color: var(--muted);
  font-size: 0.91rem;
}

.step-arrow {
  display: grid;
  width: 3rem;
  height: 3rem;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 50%;
  transition: background 180ms ease, color 180ms ease;
}

.process-list li:hover .step-arrow {
  background: var(--ink);
  color: var(--white);
}

.about {
  padding-top: 0;
}

.about-panel {
  position: relative;
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  min-height: 43rem;
  border-radius: var(--radius-lg);
  background: #efe9f8;
  overflow: hidden;
}

.about-shape {
  position: absolute;
  top: -20%;
  left: -17%;
  width: 65%;
  height: 130%;
  border-radius: 42% 58% 61% 39% / 35% 48% 52% 65%;
  background: var(--violet);
  transform: rotate(10deg);
}

.about-shape::before {
  content: "";
  position: absolute;
  inset: 12%;
  border: 1px solid rgba(255,255,255,.3);
  border-radius: inherit;
}

.about-label {
  position: relative;
  z-index: 2;
  align-self: center;
  padding: 4rem;
  color: var(--white);
}

.about-label span {
  display: block;
  margin-bottom: 2rem;
  color: var(--amber-light);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.22em;
}

.about-label strong {
  font-size: clamp(3rem, 5vw, 5.2rem);
  letter-spacing: 0.12em;
  line-height: 1.15;
}

.about-copy {
  position: relative;
  z-index: 2;
  align-self: center;
  padding: 4rem clamp(2rem, 5vw, 5.5rem) 4rem 2rem;
}

.about-copy h2 {
  font-size: clamp(2.4rem, 4vw, 4rem);
}

.about-copy > p:not(.section-kicker) {
  margin: 1.7rem 0 0;
  color: #655f70;
}

.value-list {
  margin-top: 2.2rem;
  border-top: 1px solid rgba(23,16,43,.12);
}

.value-list div {
  display: grid;
  grid-template-columns: 2rem 1fr;
  gap: 0.8rem;
  padding: 0.85rem 0;
  border-bottom: 1px solid rgba(23,16,43,.12);
}

.value-list span {
  color: var(--violet);
  font-size: 0.68rem;
  font-weight: 800;
}

.value-list p {
  margin: 0;
  color: var(--muted);
  font-size: 0.86rem;
}

.value-list strong {
  margin-right: 0.75rem;
  color: var(--ink);
}

.faq {
  display: grid;
  grid-template-columns: 0.6fr 1fr;
  gap: clamp(3rem, 8vw, 8rem);
  align-items: start;
}

.faq h2 {
  font-size: clamp(2.5rem, 4vw, 4.3rem);
}

.faq-list {
  border-top: 1px solid var(--line);
}

.faq-list details {
  border-bottom: 1px solid var(--line);
}

.faq-list summary {
  position: relative;
  padding: 1.7rem 3.2rem 1.7rem 0;
  font-size: 1.05rem;
  font-weight: 750;
  cursor: pointer;
  list-style: none;
}

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

.faq-list summary span,
.faq-list summary span::after {
  position: absolute;
  top: 50%;
  right: 0.35rem;
  width: 1rem;
  height: 2px;
  border-radius: 2px;
  background: var(--violet);
  content: "";
  transition: transform 180ms ease;
}

.faq-list summary span::after {
  top: 0;
  right: 0;
  transform: rotate(90deg);
}

.faq-list details[open] summary span::after {
  transform: rotate(0deg);
}

.faq-list details p {
  max-width: 39rem;
  margin: -0.4rem 3rem 1.8rem 0;
  color: var(--muted);
}

.closing {
  position: relative;
  min-height: 45rem;
  padding: clamp(6rem, 10vw, 9rem) max(1.5rem, calc((100vw - var(--max-width)) / 2));
  overflow: hidden;
  background: var(--ink);
  color: var(--white);
}

.closing::before {
  content: "";
  position: absolute;
  inset: 0;
  opacity: .18;
  background-image: radial-gradient(rgba(255,255,255,.45) 1px, transparent 1px);
  background-size: 2.1rem 2.1rem;
  mask-image: linear-gradient(90deg, black, transparent 70%);
}

.closing > *:not(.closing-shape) {
  position: relative;
  z-index: 2;
}

.closing h2 {
  max-width: 65rem;
}

.closing h2 em {
  color: var(--amber-light);
}

.closing > p:not(.section-kicker) {
  margin: 2rem 0 0;
  color: rgba(255,255,255,.62);
  font-size: 1.05rem;
}

.button-amber {
  background: var(--amber);
  color: var(--ink);
  box-shadow: 0 14px 30px rgba(0,0,0,.22);
}

.button-amber span {
  background: var(--ink);
  color: var(--white);
}

.button-amber:hover {
  background: var(--amber-light);
}

.closing-link {
  color: var(--white);
}

.closing-link:hover span {
  transform: translateY(-3px);
}

.closing-shape {
  position: absolute;
  top: 50%;
  right: -7%;
  width: min(46rem, 52vw);
  aspect-ratio: 1;
  border-radius: 37% 63% 46% 54% / 56% 38% 62% 44%;
  background: linear-gradient(140deg, var(--violet), #3b2867);
  box-shadow: inset 0 0 0 2rem rgba(255,255,255,.025);
  transform: translateY(-50%) rotate(-12deg);
}

.closing-shape::before,
.closing-shape::after {
  content: "";
  position: absolute;
  border: 1px solid rgba(255,255,255,.22);
  border-radius: 50%;
}

.closing-shape::before { inset: 15%; }
.closing-shape::after { inset: 31%; background: rgba(241,173,49,.55); }

.back-to-top {
  position: fixed;
  right: 1.5rem;
  bottom: 1.5rem;
  z-index: 90;
  display: grid;
  width: 3rem;
  height: 3rem;
  place-items: center;
  border: 0;
  border-radius: 50%;
  background: var(--amber);
  color: var(--ink);
  box-shadow: 0 12px 30px rgba(23,16,43,.18);
  cursor: pointer;
  opacity: 0;
  transform: translateY(1rem);
  pointer-events: none;
  transition: opacity 180ms ease, transform 180ms ease;
}

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

@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr 0.85fr;
    gap: 2rem;
  }

  .hero-poster {
    min-height: 36rem;
  }

  .poster-core {
    width: 10rem;
    height: 10rem;
  }

  .poster-core strong {
    font-size: 1.75rem;
  }

  .method {
    grid-template-columns: 0.7fr minmax(450px, 1fr);
    gap: 2rem;
  }

  .about-panel {
    grid-template-columns: 0.7fr 1.3fr;
  }

  .about-label {
    padding: 2.5rem;
  }
}

@media (max-width: 820px) {
  .site-header {
    width: calc(100% - 2rem);
    margin-top: 0.65rem;
  }

  .menu-toggle {
    display: block;
  }

  .site-nav {
    position: absolute;
    top: calc(100% + 0.6rem);
    right: 0;
    left: 0;
    display: flex;
    padding: 1rem;
    border: 1px solid rgba(255,255,255,.75);
    border-radius: 1.5rem;
    background: rgba(253,251,247,.97);
    box-shadow: var(--shadow);
    flex-direction: column;
    align-items: stretch;
    opacity: 0;
    transform: translateY(-0.75rem);
    visibility: hidden;
    transition: opacity 180ms ease, transform 180ms ease, visibility 180ms ease;
  }

  .site-nav.is-open {
    opacity: 1;
    transform: translateY(0);
    visibility: visible;
  }

  html:not(.js) .site-header {
    position: absolute;
    flex-wrap: wrap;
  }

  html:not(.js) .menu-toggle {
    display: none;
  }

  html:not(.js) .site-nav {
    position: static;
    display: flex;
    width: 100%;
    padding: 0.4rem 0 0;
    border: 0;
    background: transparent;
    box-shadow: none;
    flex-flow: row wrap;
    justify-content: center;
    opacity: 1;
    transform: none;
    visibility: visible;
  }

  html:not(.js) .hero {
    padding-top: 13rem;
  }

  .site-nav a {
    padding: 0.85rem 1rem;
    text-align: center;
  }

  .site-nav .nav-cta {
    margin: 0.4rem 0 0;
  }

  .hero {
    padding-top: 8.7rem;
  }

  .hero-grid {
    grid-template-columns: 1fr;
  }

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

  .hero h1 {
    max-width: 10ch;
    font-size: clamp(3.6rem, 13vw, 6rem);
  }

  .hero-poster {
    width: min(100%, 34rem);
    min-height: 38rem;
    margin: 1rem auto 0;
  }

  .hero-index {
    grid-template-columns: 1fr;
    margin-top: 2.5rem;
  }

  .hero-index div,
  .hero-index div:last-child {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .hero-index div:last-child {
    border-bottom: 0;
  }

  .section-heading,
  .process-heading,
  .faq {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .section-heading > p:last-child,
  .process-heading > p {
    max-width: 38rem;
  }

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

  .method-intro {
    max-width: 42rem;
  }

  .method-stage {
    min-height: 40rem;
  }

  .method-rings {
    width: min(38rem, 85vw);
  }

  .about-panel {
    grid-template-columns: 1fr;
  }

  .about-shape {
    top: -33%;
    left: -12%;
    width: 112%;
    height: 72%;
  }

  .about-label {
    min-height: 24rem;
    padding: 3rem;
  }

  .about-label strong {
    font-size: clamp(3rem, 12vw, 5rem);
  }

  .about-copy {
    padding: 3.5rem 2rem;
  }

  .faq-heading {
    max-width: 35rem;
  }

  .closing-shape {
    right: -25%;
    width: 70vw;
    opacity: .55;
  }
}

@media (max-width: 600px) {
  :root {
    --radius-lg: 2.25rem;
    --radius-md: 1.55rem;
  }

  html {
    scroll-padding-top: 6rem;
  }

  .site-header {
    min-height: 4.35rem;
    padding: 0.5rem 0.55rem 0.5rem 0.7rem;
    border-radius: 1.2rem;
  }

  .brand {
    min-width: 0;
  }

  .brand-mark {
    width: 2.55rem;
    height: 2.55rem;
  }

  .brand-text strong {
    font-size: 0.82rem;
  }

  .brand-text span {
    font-size: 0.57rem;
  }

  .hero {
    padding-right: 1rem;
    padding-left: 1rem;
  }

  .hero h1 {
    font-size: clamp(3.25rem, 16vw, 5rem);
  }

  .hero-lead {
    font-size: 0.97rem;
    line-height: 1.8;
  }

  .hero-actions,
  .closing-actions {
    align-items: flex-start;
    flex-direction: column;
    gap: 1.25rem;
  }

  .hero-poster {
    min-height: 32rem;
    border-radius: 42% 42% 1.7rem 1.7rem / 16% 16% 1.7rem 1.7rem;
  }

  .poster-core {
    width: 9rem;
    height: 9rem;
  }

  .poster-tag {
    min-width: 5rem;
    padding: 0.55rem 0.7rem;
    font-size: 0.73rem;
  }

  .tag-brand { left: 3%; }
  .tag-product { right: 3%; }
  .tag-channel { right: 3%; }
  .tag-user { left: 3%; }

  .poster-note {
    right: 1rem;
    left: 1rem;
  }

  .section {
    width: calc(100% - 2rem);
  }

  .section h2,
  .method h2,
  .closing h2 {
    font-size: clamp(2.45rem, 11vw, 3.5rem);
  }

  .capability-grid {
    grid-template-columns: 1fr;
    margin-top: 3rem;
  }

  .capability-card {
    min-height: 25rem;
  }

  .capability-card h3 {
    margin-top: 3.4rem;
  }

  .method {
    padding-right: 1rem;
    padding-left: 1rem;
  }

  .method-stage {
    min-height: 40rem;
    margin-right: -0.5rem;
    margin-left: -0.5rem;
  }

  .method-rings {
    width: 30rem;
  }

  .method-center {
    width: 9rem;
    height: 9rem;
  }

  .method-center strong {
    font-size: 1.45rem;
  }

  .method-point {
    width: 10.5rem;
    padding: 0.85rem;
  }

  .point-one { top: 2%; left: 0; }
  .point-two { top: 23%; right: 0; }
  .point-three { bottom: 1%; left: 2%; }

  .process-list {
    margin-top: 3rem;
  }

  .process-list li {
    grid-template-columns: 2.5rem minmax(0, 1fr);
    gap: 0.8rem;
    padding: 1.5rem 0;
  }

  .step-arrow {
    display: none;
  }

  .process-list li:hover {
    padding-right: 0;
    padding-left: 0;
    background: transparent;
  }

  .about-label {
    min-height: 21rem;
    padding: 2.2rem;
  }

  .about-copy {
    padding: 3rem 1.4rem;
  }

  .value-list p strong {
    display: block;
    margin: 0 0 0.2rem;
  }

  .faq-list summary {
    font-size: 0.96rem;
  }

  .closing {
    min-height: 39rem;
    padding-right: 1rem;
    padding-left: 1rem;
  }

  .closing-shape {
    top: 70%;
    right: -34%;
    width: 30rem;
  }

  .back-to-top {
    right: 1rem;
    bottom: 1rem;
  }
}

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

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

@media (forced-colors: active) {
  .poster-core,
  .poster-tag,
  .method-point,
  .method-center,
  .button,
  .nav-cta {
    border: 1px solid currentColor;
  }
}