:root {
  --ink: #101a3f;
  --muted: #5d6888;
  --line: rgba(37, 50, 97, 0.12);
  --blue: #3c8df6;
  --cyan: #19c4e6;
  --violet: #7059f1;
  --yellow: #ffd35c;
  --pink: #ff7bc1;
  --green: #6bd486;
  --paper: #f7faff;
  --card: rgba(255, 255, 255, 0.88);
  --shadow: 0 22px 70px rgba(35, 52, 105, 0.16);
  color-scheme: light;
  font-family: "Nunito", "Nunito Sans", ui-rounded, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  line-height: 1.6;
}

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

img {
  display: block;
  max-width: 100%;
}

.site-shell {
  overflow: hidden;
}

.nav {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid rgba(255, 255, 255, 0.4);
  background: rgba(247, 250, 255, 0.78);
  backdrop-filter: blur(18px);
}

.nav-inner,
.section-inner,
.footer-inner {
  width: min(1160px, calc(100% - 40px));
  margin: 0 auto;
}

.nav-inner {
  min-height: 74px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand-link {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 900;
  letter-spacing: 0;
}

.brand-mark {
  width: 42px;
  height: 42px;
  border-radius: 15px;
  display: grid;
  place-items: center;
  color: #fff;
  background:
    radial-gradient(circle at 68% 20%, var(--yellow) 0 10%, transparent 11%),
    radial-gradient(circle at 32% 70%, #fff 0 10%, transparent 11%),
    linear-gradient(135deg, var(--violet), var(--blue));
  box-shadow: 0 12px 30px rgba(91, 99, 232, 0.28);
  font-size: 24px;
}

.brand-text {
  display: grid;
  line-height: 1.05;
}

.brand-text small {
  color: var(--muted);
  font-weight: 800;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 18px;
  color: var(--muted);
  font-size: 15px;
  font-weight: 800;
}

.nav-links a:hover {
  color: var(--ink);
}

.lang-pill {
  padding: 9px 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.64);
}

.hero {
  position: relative;
  min-height: 760px;
  padding: 66px 0 72px;
  display: flex;
  align-items: center;
  background:
    radial-gradient(circle at 8% 12%, rgba(255, 211, 92, 0.18), transparent 28%),
    radial-gradient(circle at 86% 34%, rgba(25, 196, 230, 0.16), transparent 30%),
    linear-gradient(180deg, #f7faff 0%, #eef5ff 100%);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.94fr) minmax(460px, 1.08fr);
  align-items: center;
  gap: 52px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border: 1px solid rgba(61, 141, 246, 0.2);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.72);
  color: #315aaf;
  font-size: 14px;
  font-weight: 900;
}

.eyebrow::before {
  content: "";
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--yellow), var(--pink));
}

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

h1 {
  margin: 24px 0 20px;
  max-width: 720px;
  font-size: clamp(46px, 7vw, 86px);
  line-height: 0.98;
  letter-spacing: 0;
}

.lead {
  max-width: 610px;
  color: var(--muted);
  font-size: clamp(18px, 2vw, 22px);
}

.actions {
  margin-top: 34px;
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 50px;
  padding: 0 18px;
  border-radius: 16px;
  border: 1px solid rgba(255, 255, 255, 0.5);
  background: var(--ink);
  color: #fff;
  font-weight: 900;
  box-shadow: 0 18px 38px rgba(16, 26, 63, 0.2);
}

.button.secondary {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.8);
  border-color: var(--line);
  box-shadow: none;
}

.hero-visual {
  position: relative;
}

.hero-image {
  width: 100%;
  border-radius: 30px;
  box-shadow: var(--shadow);
  border: 1px solid rgba(255, 255, 255, 0.62);
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.orbit-note {
  position: absolute;
  left: -22px;
  bottom: -26px;
  width: min(320px, 64%);
  padding: 18px;
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.9);
  box-shadow: 0 18px 48px rgba(41, 60, 113, 0.16);
  border: 1px solid rgba(255, 255, 255, 0.7);
}

.orbit-note strong {
  display: block;
  font-size: 18px;
  margin-bottom: 4px;
}

.orbit-note span {
  color: var(--muted);
  font-size: 14px;
}

.section {
  padding: 86px 0;
}

.section.alt {
  background: linear-gradient(180deg, #fff 0%, #eef6ff 100%);
}

.section-title {
  display: grid;
  gap: 12px;
  margin-bottom: 34px;
}

.section-title h2 {
  margin: 0;
  font-size: clamp(30px, 4vw, 48px);
  line-height: 1.08;
}

.section-title p {
  max-width: 760px;
  margin: 0;
  color: var(--muted);
  font-size: 18px;
}

.concept-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 24px;
}

.panel,
.product-card,
.world-card,
.stat-card {
  border: 1px solid rgba(255, 255, 255, 0.72);
  border-radius: 24px;
  background: var(--card);
  box-shadow: 0 18px 54px rgba(40, 55, 103, 0.1);
}

.panel {
  padding: 30px;
}

.panel h3 {
  font-size: 26px;
  margin-bottom: 12px;
}

.panel p,
.product-card p,
.world-card p {
  color: var(--muted);
}

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

.value {
  padding: 18px;
  border-radius: 20px;
  background: rgba(247, 250, 255, 0.9);
  border: 1px solid var(--line);
}

.value b {
  display: block;
  margin-bottom: 5px;
}

.matrix-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.product-card {
  overflow: hidden;
}

.product-media {
  position: relative;
  min-height: 220px;
  display: grid;
  place-items: center;
  padding: 24px;
  background:
    radial-gradient(circle at 20% 20%, rgba(255, 211, 92, 0.36), transparent 28%),
    linear-gradient(135deg, #eef4ff, #cdefff);
}

.product-media img {
  border-radius: 24px;
  max-height: 240px;
  object-fit: cover;
  box-shadow: 0 18px 46px rgba(33, 57, 118, 0.2);
}

.product-icon {
  width: 108px;
  height: 108px;
}

.concept-icon {
  width: 118px;
  height: 118px;
  border-radius: 30px;
  display: grid;
  place-items: center;
  color: #fff;
  font-size: 54px;
  font-weight: 1000;
  box-shadow: 0 18px 42px rgba(40, 55, 103, 0.18);
}

.concept-icon.art {
  background: linear-gradient(135deg, var(--pink), var(--violet));
}

.concept-icon.math {
  background: linear-gradient(135deg, var(--blue), var(--cyan));
}

.concept-icon.story {
  background: linear-gradient(135deg, #5267f7, #8ad8ff);
}

.concept-icon.life {
  background: linear-gradient(135deg, var(--green), #3c8df6);
}

.product-body {
  padding: 22px;
}

.product-kicker {
  color: #315aaf;
  font-size: 13px;
  font-weight: 900;
  text-transform: uppercase;
}

.product-body h3 {
  margin: 6px 0 8px;
  font-size: 24px;
  line-height: 1.15;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}

.tag {
  padding: 6px 10px;
  border-radius: 999px;
  color: #31406f;
  background: #eef4ff;
  font-size: 12px;
  font-weight: 900;
}

.world-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.world-card {
  padding: 22px;
}

.world-card .mini {
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  border-radius: 16px;
  margin-bottom: 16px;
  background: #eef4ff;
  font-size: 20px;
  font-weight: 1000;
  color: #315aaf;
}

.stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.stat-card {
  padding: 24px;
}

.stat-card b {
  display: block;
  font-size: 28px;
  line-height: 1;
  margin-bottom: 8px;
}

.stat-card span {
  color: var(--muted);
}

.cta-band {
  padding: 48px;
  border-radius: 32px;
  color: #fff;
  background:
    radial-gradient(circle at 84% 28%, rgba(255, 211, 92, 0.3), transparent 24%),
    radial-gradient(circle at 20% 90%, rgba(25, 196, 230, 0.25), transparent 28%),
    linear-gradient(135deg, #08133d, #1a42a6 52%, #6a5cf1);
  box-shadow: var(--shadow);
}

.cta-band p {
  max-width: 720px;
  color: rgba(255, 255, 255, 0.8);
  font-size: 18px;
}

.footer {
  padding: 44px 0 58px;
  color: rgba(255, 255, 255, 0.78);
  background: #07102e;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 28px;
}

.footer a {
  color: #fff;
  font-weight: 800;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

@media (max-width: 920px) {
  .nav-links {
    display: none;
  }

  .hero {
    min-height: auto;
    padding-top: 44px;
  }

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

  .hero-grid {
    gap: 36px;
  }

  .matrix-grid,
  .world-grid,
  .stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .nav-inner,
  .section-inner,
  .footer-inner {
    width: min(100% - 28px, 1160px);
  }

  .hero {
    padding-bottom: 48px;
  }

  h1 {
    font-size: 44px;
  }

  .matrix-grid,
  .world-grid,
  .stats,
  .values {
    grid-template-columns: 1fr;
  }

  .orbit-note {
    position: static;
    width: 100%;
    margin-top: 14px;
  }

  .cta-band {
    padding: 30px;
    border-radius: 26px;
  }

  .footer-inner {
    flex-direction: column;
  }
}