:root {
  --page-bg: #06101d;
  --page-bg-2: #0a1628;
  --panel-0: rgba(10, 20, 36, 0.82);
  --panel-1: rgba(13, 27, 46, 0.92);
  --panel-2: rgba(18, 38, 64, 0.86);
  --line: rgba(134, 205, 255, 0.15);
  --line-strong: rgba(134, 205, 255, 0.34);
  --text-0: #f5f9ff;
  --text-1: rgba(233, 241, 252, 0.82);
  --text-2: rgba(192, 209, 228, 0.64);
  --cyan: #7be0ff;
  --blue: #4a8fff;
  --mint: #47d8c4;
  --shadow-xl: 0 42px 110px rgba(0, 0, 0, 0.42);
  --shadow-lg: 0 24px 60px rgba(0, 0, 0, 0.28);
  --radius-xl: 30px;
  --radius-lg: 22px;
  --radius-md: 18px;
  --content-width: 1240px;
  --font-display: "Sora", "Space Grotesk", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 8% 16%, rgba(69, 138, 255, 0.24), transparent 26%),
    radial-gradient(circle at 88% 14%, rgba(71, 216, 196, 0.18), transparent 24%),
    radial-gradient(circle at 50% 82%, rgba(95, 144, 255, 0.14), transparent 32%),
    linear-gradient(180deg, #07111f 0%, #081321 34%, #09121d 100%);
  color: var(--text-0);
  font-family: var(--font-display);
  overflow-x: hidden;
}

body::before,
body::after {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
}

body::before {
  background:
    radial-gradient(480px 480px at var(--pointer-x, 50%) var(--pointer-y, 20%), rgba(87, 178, 255, 0.14), transparent 62%);
  transition: background 120ms linear;
}

body::after {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.03), transparent 26%);
}

a {
  color: inherit;
}

.site-shell {
  position: relative;
  isolation: isolate;
}

.site-noise,
.site-grid,
.site-glow {
  position: fixed;
  inset: 0;
  pointer-events: none;
}

.site-noise {
  opacity: 0.08;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
  background-size: 3px 3px;
  mix-blend-mode: soft-light;
}

.site-grid {
  opacity: 0.34;
  background-image:
    linear-gradient(rgba(116, 174, 233, 0.09) 1px, transparent 1px),
    linear-gradient(90deg, rgba(116, 174, 233, 0.09) 1px, transparent 1px);
  background-size: 104px 104px;
  mask-image: radial-gradient(circle at center, black 38%, transparent 92%);
}

.site-glow--left {
  left: -10vw;
  top: 8vh;
  right: auto;
  bottom: auto;
  width: 34vw;
  height: 34vw;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(79, 143, 255, 0.22), transparent 66%);
  filter: blur(34px);
}

.site-glow--right {
  inset: auto -8vw -8vh auto;
  width: 40vw;
  height: 40vw;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(72, 221, 206, 0.14), transparent 68%);
  filter: blur(40px);
}

.topbar,
.hero,
.section,
.footer {
  width: min(var(--content-width), calc(100% - 40px));
  margin-inline: auto;
}

.topbar {
  position: sticky;
  top: 14px;
  z-index: 10;
  margin-top: 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 18px;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: rgba(9, 19, 34, 0.66);
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(20px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.brand__mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 16px;
  border: 1px solid rgba(141, 210, 255, 0.22);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.11), rgba(255, 255, 255, 0.03));
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06);
}

.brand__mark img {
  width: 30px;
  height: 30px;
}

.brand__text {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.24em;
  text-transform: uppercase;
}

.topnav {
  display: inline-flex;
  align-items: center;
  gap: 24px;
}

.topnav a {
  color: var(--text-2);
  text-decoration: none;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  transition: color 180ms ease;
}

.topnav a:hover {
  color: var(--text-0);
}

.topbar__actions,
.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 156px;
  padding: 13px 20px;
  border: 1px solid rgba(140, 208, 255, 0.16);
  border-radius: 16px;
  text-decoration: none;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  transition:
    transform 180ms ease,
    box-shadow 180ms ease,
    border-color 180ms ease,
    background 180ms ease;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn--primary {
  color: #04101d;
  background: linear-gradient(135deg, #7be0ff, #4a8fff 68%);
  box-shadow: 0 18px 40px rgba(34, 116, 255, 0.28);
}

.btn--ghost {
  color: var(--text-0);
  background: rgba(255, 255, 255, 0.04);
}

.btn--large {
  min-width: 188px;
  padding: 16px 24px;
}

.hero {
  padding: 90px 0 54px;
  display: grid;
  grid-template-columns: minmax(0, 1.16fr) minmax(360px, 0.84fr);
  gap: 28px;
  align-items: center;
}

.eyebrow {
  margin-bottom: 18px;
  color: rgba(174, 220, 255, 0.78);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.34em;
  text-transform: uppercase;
}

.hero h1 {
  max-width: 700px;
  margin: 0 0 18px;
  font-size: clamp(40px, 4.8vw, 72px);
  line-height: 1;
  letter-spacing: -0.05em;
  text-wrap: balance;
}

.hero-title__line {
  display: block;
  white-space: nowrap;
}

.hero-title__line--soft {
  color: var(--text-0);
}

.hero-title__line--accent {
  color: #9be8ff;
  text-shadow: 0 0 28px rgba(123, 224, 255, 0.16);
}

.hero-title__nowrap {
  display: inline-block;
  white-space: nowrap;
}

.hero__lead {
  max-width: 640px;
  margin: 0 0 30px;
  color: var(--text-1);
  font-size: 18px;
  line-height: 1.85;
}

.hero__signals {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-top: 36px;
}

.signal-card {
  padding: 18px 18px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: linear-gradient(180deg, rgba(11, 21, 38, 0.86), rgba(14, 29, 50, 0.76));
  box-shadow: var(--shadow-lg);
}

.signal-card strong {
  display: block;
  margin-bottom: 8px;
  font-size: 28px;
  color: var(--text-0);
}

.signal-card span {
  color: var(--text-2);
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero__stage {
  position: relative;
  min-height: 620px;
  display: grid;
  place-items: center;
}

.hero-orbit {
  position: relative;
  inset: auto;
  width: min(100%, 580px);
  aspect-ratio: 1;
  display: grid;
  place-items: center;
}

.hero-orbit__halo {
  position: absolute;
  inset: 14%;
  border-radius: 50%;
  background:
    radial-gradient(circle, rgba(76, 190, 255, 0.14) 0%, rgba(76, 190, 255, 0.05) 34%, transparent 72%),
    radial-gradient(circle at 56% 56%, rgba(71, 216, 196, 0.1), transparent 64%);
  filter: blur(18px);
}

.hero-orbit__ring {
  position: absolute;
  border-radius: 50%;
  border: 1px solid rgba(133, 208, 255, 0.16);
}

.hero-orbit__ring--outer {
  inset: 0;
  animation: rotate-slow 28s linear infinite;
}

.hero-orbit__ring--mid {
  inset: 9%;
  border-style: solid;
  border-color: rgba(123, 224, 255, 0.08);
  box-shadow: inset 0 0 0 1px rgba(123, 224, 255, 0.03);
}

.hero-orbit__ring--inner {
  inset: 22%;
  border-style: dashed;
  border-color: rgba(123, 224, 255, 0.13);
  animation: rotate-reverse 18s linear infinite;
}

.hero-orbit__ring--outer::before,
.hero-orbit__ring--inner::before,
.hero-orbit__ring--mid::before {
  content: "";
  position: absolute;
  top: -5px;
  left: 50%;
  width: 11px;
  height: 11px;
  margin-left: -5px;
  border-radius: 50%;
  background: linear-gradient(135deg, #7be0ff, #4a8fff);
  box-shadow: 0 0 18px rgba(123, 224, 255, 0.65);
}

.hero-orbit__ring--mid::before {
  top: auto;
  bottom: -5px;
  left: auto;
  right: 16%;
}

.hero-orbit__axis {
  position: absolute;
  background: linear-gradient(90deg, transparent, rgba(123, 224, 255, 0.08), transparent);
  opacity: 0.9;
}

.hero-orbit__axis--horizontal {
  left: 8%;
  right: 8%;
  top: 50%;
  height: 1px;
}

.hero-orbit__axis--vertical {
  top: 8%;
  bottom: 8%;
  left: 50%;
  width: 1px;
  background: linear-gradient(180deg, transparent, rgba(123, 224, 255, 0.08), transparent);
}

.hero-orbit__scan {
  position: absolute;
  inset: 2%;
  border-radius: 50%;
  background: conic-gradient(from 150deg, transparent 0deg, transparent 264deg, rgba(123, 224, 255, 0.18) 292deg, rgba(123, 224, 255, 0.42) 314deg, transparent 336deg);
  -webkit-mask: radial-gradient(farthest-side, transparent calc(100% - 18px), #000 calc(100% - 17px), #000 calc(100% - 10px), transparent calc(100% - 9px));
  mask: radial-gradient(farthest-side, transparent calc(100% - 18px), #000 calc(100% - 17px), #000 calc(100% - 10px), transparent calc(100% - 9px));
  animation: rotate-slow 9s linear infinite;
}

.hero-orbit__node {
  position: absolute;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(135, 223, 255, 1), rgba(74, 143, 255, 0.95));
  box-shadow:
    0 0 0 10px rgba(123, 224, 255, 0.03),
    0 0 24px rgba(123, 224, 255, 0.44);
}

.hero-orbit__node--alpha {
  top: 14%;
  right: 12%;
  width: 18px;
  height: 18px;
}

.hero-orbit__node--beta {
  bottom: 23%;
  left: 17%;
  width: 16px;
  height: 16px;
}

.hero-orbit__node--gamma {
  top: 48%;
  right: 4%;
  width: 13px;
  height: 13px;
}

.hero-orbit__node--delta {
  top: 24%;
  left: 18%;
  width: 10px;
  height: 10px;
  opacity: 0.76;
}

.hero-orbit__caption {
  position: absolute;
  color: rgba(171, 220, 255, 0.6);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}

.hero-orbit__caption::before {
  content: "";
  position: absolute;
  top: 50%;
  width: 34px;
  height: 1px;
  background: linear-gradient(90deg, rgba(123, 224, 255, 0.42), transparent);
}

.hero-orbit__caption--top {
  top: 20%;
  left: 8%;
  padding-left: 46px;
}

.hero-orbit__caption--top::before {
  left: 0;
}

.hero-orbit__caption--bottom {
  right: 6%;
  bottom: 13%;
  padding-right: 46px;
}

.hero-orbit__caption--bottom::before {
  right: 0;
  left: auto;
  background: linear-gradient(90deg, transparent, rgba(123, 224, 255, 0.42));
}

.hero-orbit__core {
  position: relative;
  display: grid;
  place-items: center;
  width: 210px;
  height: 210px;
  border-radius: 54px;
  border: 1px solid rgba(136, 205, 255, 0.22);
  background:
    radial-gradient(circle at 30% 24%, rgba(255, 255, 255, 0.12), transparent 44%),
    linear-gradient(145deg, rgba(11, 22, 39, 0.96), rgba(17, 35, 59, 0.88));
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.05),
    0 34px 90px rgba(0, 0, 0, 0.34);
  overflow: hidden;
}

.hero-orbit__core::before {
  content: "";
  position: absolute;
  inset: 18px;
  border-radius: 34px;
  border: 1px solid rgba(143, 219, 255, 0.12);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.04), transparent 36%),
    linear-gradient(145deg, rgba(13, 25, 44, 0.76), rgba(18, 39, 66, 0.58));
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04);
}

.hero-orbit__core::after {
  content: "";
  position: absolute;
  inset: -22px;
  border-radius: 68px;
  border: 1px solid rgba(123, 224, 255, 0.08);
}

.hero-orbit__core img {
  position: relative;
  z-index: 2;
  width: 92px;
  height: 92px;
}

.hero-orbit__core-shell,
.hero-orbit__core-pulse {
  position: absolute;
  border-radius: 50%;
}

.hero-orbit__core-shell {
  inset: auto auto 26px 26px;
  width: 16px;
  height: 16px;
  background: linear-gradient(135deg, rgba(123, 224, 255, 1), rgba(74, 143, 255, 0.94));
  box-shadow:
    0 0 0 8px rgba(123, 224, 255, 0.06),
    0 0 20px rgba(123, 224, 255, 0.5);
  z-index: 2;
}

.hero-orbit__core-pulse {
  top: 28px;
  right: 28px;
  width: 10px;
  height: 10px;
  background: rgba(71, 216, 196, 0.92);
  box-shadow:
    0 0 0 7px rgba(71, 216, 196, 0.06),
    0 0 18px rgba(71, 216, 196, 0.4);
  z-index: 2;
  animation: pulse-soft 2.6s ease-in-out infinite;
}

.section {
  padding: 36px 0 54px;
}

.section-heading {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(280px, 0.72fr);
  gap: 28px;
  align-items: end;
  margin-bottom: 30px;
}

.section-heading h2 {
  max-width: 680px;
  margin: 0;
  font-size: clamp(28px, 3vw, 44px);
  line-height: 1.08;
  letter-spacing: -0.04em;
}

.section-heading__summary {
  max-width: 420px;
  margin: 0 0 4px auto;
  color: var(--text-2);
  font-size: 15px;
  line-height: 1.85;
}

.feature-grid,
.model-grid,
.workflow {
  display: grid;
  gap: 18px;
}

.feature-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.feature-card,
.model-card,
.workflow-step {
  position: relative;
  border: 1px solid var(--line);
  border-radius: 26px;
  background: linear-gradient(180deg, rgba(10, 20, 36, 0.9), rgba(14, 28, 48, 0.82));
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

.feature-card,
.model-card,
.workflow-step {
  padding: 24px;
}

.feature-card::before,
.model-card::before,
.workflow-step::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(135deg, rgba(143, 219, 255, 0.24), transparent, rgba(71, 216, 196, 0.18));
  mask:
    linear-gradient(#fff 0 0) content-box,
    linear-gradient(#fff 0 0);
  mask-composite: exclude;
  pointer-events: none;
}

.feature-card__index {
  display: inline-flex;
  margin-bottom: 18px;
  color: rgba(126, 200, 255, 0.78);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.28em;
}

.feature-card h3,
.model-card h3,
.workflow-step h3 {
  margin: 0 0 12px;
  font-size: 22px;
  letter-spacing: -0.03em;
}

.feature-card p,
.model-card p,
.workflow-step p {
  margin: 0;
  color: var(--text-1);
  line-height: 1.8;
}

.model-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.model-card__tag {
  margin-bottom: 18px;
  color: rgba(163, 220, 255, 0.76);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.26em;
  text-transform: uppercase;
}

.model-card--chat {
  background:
    radial-gradient(circle at top right, rgba(74, 143, 255, 0.18), transparent 35%),
    linear-gradient(180deg, rgba(10, 20, 36, 0.9), rgba(14, 28, 48, 0.82));
}

.model-card--reasoner {
  background:
    radial-gradient(circle at top right, rgba(123, 224, 255, 0.15), transparent 36%),
    linear-gradient(180deg, rgba(10, 20, 36, 0.9), rgba(14, 28, 48, 0.82));
}

.model-card--doubao {
  background:
    radial-gradient(circle at top right, rgba(71, 216, 196, 0.14), transparent 35%),
    linear-gradient(180deg, rgba(10, 20, 36, 0.9), rgba(14, 28, 48, 0.82));
}

.workflow {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.workflow-step span {
  display: inline-flex;
  margin-bottom: 18px;
  color: rgba(163, 220, 255, 0.82);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.28em;
}

.footer {
  padding: 18px 0 32px;
  text-align: center;
}

.ucb-footer-copy {
  color: rgba(231, 240, 255, 0.78);
  font-size: 13px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition:
    opacity 700ms ease,
    transform 700ms ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@keyframes rotate-slow {
  from {
    transform: rotate(0deg);
  }

  to {
    transform: rotate(360deg);
  }
}

@keyframes rotate-reverse {
  from {
    transform: rotate(0deg);
  }

  to {
    transform: rotate(-360deg);
  }
}

@keyframes pulse-soft {
  0%,
  100% {
    transform: scale(1);
    opacity: 0.88;
  }

  50% {
    transform: scale(1.22);
    opacity: 1;
  }
}

@media (min-width: 1181px) and (max-width: 1380px) {
  .hero {
    grid-template-columns: minmax(0, 1.22fr) minmax(320px, 0.78fr);
    gap: 24px;
  }

  .hero h1 {
    max-width: 620px;
    font-size: clamp(38px, 4.4vw, 62px);
  }

  .hero__lead {
    max-width: 600px;
  }

  .hero-orbit {
    width: min(100%, 520px);
  }
}

@media (max-width: 1180px) {
  .hero {
    grid-template-columns: 1fr;
  }

  .hero__stage {
    min-height: 620px;
  }
}

@media (max-width: 860px) {
  .topbar {
    position: static;
    flex-wrap: wrap;
    justify-content: center;
  }

  .topnav {
    order: 3;
    width: 100%;
    justify-content: center;
    gap: 18px;
  }

  .topbar__actions {
    width: 100%;
    justify-content: center;
  }

  .hero {
    padding-top: 52px;
  }

  .hero__copy,
  .hero__stage {
    min-width: 0;
  }

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

  .hero__stage {
    min-height: 500px;
  }

  .hero-orbit {
    position: relative;
    inset: 0;
    margin: 0 auto;
    width: min(100%, 430px);
  }

  .section-heading {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .section-heading__summary {
    max-width: none;
    margin: 0;
  }

  .hero-orbit__caption {
    display: none;
  }

  .hero-orbit__core {
    width: 182px;
    height: 182px;
    border-radius: 44px;
  }

  .hero-orbit__core img {
    width: 76px;
    height: 76px;
  }

  .workflow-step,
  .feature-card,
  .model-card,
  .signal-card {
    border-radius: 22px;
  }

  .feature-grid,
  .model-grid,
  .workflow {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 560px) {
  .topbar,
  .hero,
  .section,
  .footer {
    width: min(var(--content-width), calc(100% - 24px));
  }

  .btn,
  .btn--large {
    width: 100%;
  }

  .brand__text {
    letter-spacing: 0.18em;
  }

  .hero-title__nowrap {
    white-space: normal;
  }

  .hero {
    padding-top: 42px;
    gap: 20px;
  }

  .eyebrow {
    margin-bottom: 14px;
    letter-spacing: 0.22em;
  }

  .hero h1 {
    max-width: none;
    font-size: clamp(34px, 9.6vw, 44px);
    line-height: 1.02;
    letter-spacing: -0.045em;
  }

  .hero-title__line {
    white-space: normal;
  }

  .hero__lead,
  .feature-card p,
  .model-card p,
  .workflow-step p {
    font-size: 15px;
    line-height: 1.75;
  }

  .hero__lead {
    max-width: none;
    margin-bottom: 24px;
  }

  .hero__stage {
    min-height: 360px;
  }

  .hero-orbit {
    width: min(100%, 320px);
  }

  .hero-orbit__core {
    width: 156px;
    height: 156px;
    border-radius: 38px;
  }

  .hero-orbit__core img {
    width: 64px;
    height: 64px;
  }

  .hero-orbit__node--alpha {
    width: 14px;
    height: 14px;
  }

  .hero-orbit__node--beta {
    width: 13px;
    height: 13px;
  }

  .hero-orbit__node--gamma {
    width: 11px;
    height: 11px;
  }
}