:root {
  --brand-blue: #1f5eff;
  --brand-sky: #4a90e2;
  --brand-green: #148a6a;
  --primary-700: #1b4fd6;
  --text-strong: #1d2733;
  --text-main: #344252;
  --text-soft: #6b7785;
  --surface: #ffffff;
  --surface-soft: #f3f7f6;
  --border: #dde6ea;
  --dark: #16202b;
  --shadow-soft: rgba(0, 0, 0, 0.06) 0px 10px 30px;
  --shadow-card: rgba(17, 53, 94, 0.12) 0px 16px 42px -18px;
  --shadow-glow: rgba(20, 138, 106, 0.14) 0px 0px 22px;
  --radius-md: 6px;
  --radius-lg: 10px;
  --radius-pill: 9999px;
  --font-ui: Arial, "Helvetica Neue", Helvetica, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-display: Arial, "Helvetica Neue", Helvetica, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

[id] {
  scroll-margin-top: 96px;
}

body {
  margin: 0;
  color: var(--text-main);
  background:
    radial-gradient(circle at top center, rgba(74, 144, 226, 0.11), transparent 30%),
    radial-gradient(circle at 18% 20%, rgba(20, 138, 106, 0.08), transparent 22%),
    linear-gradient(180deg, #ffffff 0%, #fbfdff 45%, #ffffff 100%);
  font-family: var(--font-ui);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

.site-shell {
  overflow: clip;
}

.nav {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 16px 28px;
  background: rgba(255, 255, 255, 0.9);
  border-bottom: 1px solid rgba(231, 237, 245, 0.9);
  backdrop-filter: blur(18px);
}

.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid rgba(22, 32, 43, 0.12);
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.92);
  cursor: pointer;
}

.nav-toggle span {
  width: 18px;
  height: 2px;
  border-radius: 999px;
  background: var(--dark);
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 20px;
  flex: 1 1 auto;
  justify-content: space-between;
  min-width: 0;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.brand-mark {
  width: 38px;
  height: 38px;
  border-radius: 4px;
  background: linear-gradient(135deg, var(--brand-blue), var(--brand-green));
  box-shadow: var(--shadow-glow);
  position: relative;
}

.brand-mark::before,
.brand-mark::after {
  content: "";
  position: absolute;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.88);
}

.brand-mark::before {
  inset: 8px 8px 18px;
}

.brand-mark::after {
  inset: 19px 8px 8px 8px;
  opacity: 0.45;
}

.brand-copy strong {
  display: block;
  color: #000000;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 300;
  letter-spacing: 0.02em;
}

.brand-copy span {
  display: block;
  color: var(--text-soft);
  font-size: 12px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
}

.nav-links a {
  padding: 8px 14px;
  border-radius: var(--radius-pill);
  color: var(--text-main);
  font-size: 14px;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.nav-links a:hover {
  background: rgba(0, 0, 0, 0.045);
  color: var(--text-strong);
}

.nav-cta,
.button-dark,
.button-light {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font: inherit;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
}

.nav-cta:hover,
.button-dark:hover,
.button-light:hover {
  transform: translateY(-1px);
}

.nav-cta,
.button-dark {
  padding: 11px 18px;
  color: #ffffff;
  background: var(--dark);
  border-radius: 4px;
  box-shadow: var(--shadow-soft);
}

.button-light {
  padding: 12px 18px;
  background: var(--surface-soft);
  color: var(--text-strong);
  border-radius: 4px;
  border: 1px solid var(--border);
}

.button-light-on-dark {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.14);
  color: #ffffff;
}

.hero {
  max-width: 1260px;
  margin: 0 auto;
  padding: 72px 28px 52px;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.82fr) minmax(460px, 1.08fr);
  gap: 28px;
  align-items: center;
}

.hero-copy {
  text-align: left;
}

.hero-media {
  margin: 0;
  padding: 14px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.88);
  border: 1px solid rgba(231, 237, 245, 0.92);
  box-shadow: var(--shadow-card);
}

.hero-media img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 4px;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: var(--radius-pill);
  background: rgba(20, 86, 240, 0.07);
  color: #000000;
  font-size: 13px;
  font-weight: 300;
  letter-spacing: 0.03em;
}

.hero h1 {
  margin: 16px 0 14px;
  color: var(--text-strong);
  font-family: var(--font-display);
  font-size: inherit;
  font-weight: 400;
  line-height: 1.08;
  letter-spacing: -0.03em;
}

.hero-title-main,
.hero-title-sub {
  display: block;
}

.hero-title-main {
  color: #000000;
  font-size: clamp(34px, 5.2vw, 60px);
  font-weight: 300;
  line-height: 1.02;
  letter-spacing: -0.05em;
}

.hero-title-sub {
  margin-top: 10px;
  color: #000000;
  font-size: clamp(18px, 2.1vw, 24px);
  font-weight: 300;
  line-height: 1.28;
  letter-spacing: -0.02em;
}

.hero-lead {
  max-width: 660px;
  margin: 18px 0 0;
  color: var(--text-main);
  font-size: 15px;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 24px;
}

.hero-proof {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 20px;
}

.hero-proof span {
  padding: 8px 12px;
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid var(--border);
  color: var(--text-soft);
  font-size: 12px;
  box-shadow: 0 10px 20px rgba(36, 36, 36, 0.04);
}

.hero-ai-strip {
  display: grid;
  gap: 8px;
  margin-top: 18px;
  padding: 14px 16px;
  border-radius: 6px;
  background: linear-gradient(135deg, rgba(31, 94, 255, 0.1), rgba(20, 138, 106, 0.1));
  border: 1px solid rgba(31, 94, 255, 0.14);
}

.hero-ai-strip p {
  margin: 0;
  color: var(--text-strong);
  font-size: 13px;
  line-height: 1.75;
}

.section {
  max-width: 1260px;
  margin: 0 auto;
  padding: 34px 28px 72px;
}

.section-tight {
  padding-top: 10px;
}

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 30px;
}

.section-head-center {
  align-items: center;
  flex-direction: column;
  text-align: center;
}

.section-head h2 {
  margin: 0;
  color: #000000;
  font-size: clamp(20px, 2.5vw, 28px);
  font-weight: 300;
  line-height: 1.22;
  letter-spacing: -0.02em;
}

.section-head p {
  max-width: 680px;
  margin: 0;
  color: var(--text-soft);
  font-size: 14px;
}

.facts-grid,
.value-grid,
.scene-grid,
.content-type-grid,
.feature-list-grid,
.capability-grid,
.fit-grid {
  display: grid;
  gap: 18px;
}

.facts-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

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

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

.content-type-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

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

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

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

.fact-card,
.card,
.content-type-card,
.feature-list-card,
.faq-item {
  border-radius: var(--radius-lg);
  background: #ffffff;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-soft);
}

.fact-card {
  padding: 22px;
}

.fact-card dt {
  color: var(--text-soft);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.feature-list-card {
  padding: 22px 24px;
}

.content-type-card {
  padding: 22px 24px;
  background:
    radial-gradient(circle at top right, rgba(31, 94, 255, 0.08), transparent 32%),
    linear-gradient(180deg, #ffffff 0%, #fbfdff 100%);
}

.content-type-meta {
  display: inline-flex;
  align-items: center;
  padding: 6px 10px;
  border-radius: var(--radius-pill);
  background: rgba(22, 32, 43, 0.06);
  color: var(--text-soft);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.content-type-card h3,
.content-model-note h3 {
  margin: 14px 0 10px;
  color: var(--text-strong);
  font-size: 18px;
  font-weight: 600;
  line-height: 1.35;
  letter-spacing: -0.02em;
}

.content-type-card p,
.content-model-note p {
  margin: 0;
  color: var(--text-main);
  font-size: 14px;
  line-height: 1.78;
}

.content-model-note {
  margin-top: 18px;
  padding: 24px;
  border-radius: 10px;
  background: linear-gradient(135deg, rgba(20, 138, 106, 0.08), rgba(31, 94, 255, 0.07));
  border: 1px solid rgba(20, 138, 106, 0.16);
  box-shadow: var(--shadow-soft);
}

.content-model-note h3 {
  margin-top: 0;
}

.feature-list-card h3 {
  margin: 0 0 14px;
  color: var(--text-strong);
  font-size: 16px;
  font-weight: 600;
  line-height: 1.38;
  letter-spacing: -0.02em;
}

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

.feature-list-card li {
  position: relative;
  padding-left: 18px;
  color: var(--text-main);
  font-size: 13px;
  line-height: 1.7;
}

.feature-list-card li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 8px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--brand-blue), var(--brand-green));
}

.fact-card dd {
  margin: 12px 0 0;
  color: var(--text-strong);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.5;
  letter-spacing: -0.02em;
}

.card {
  position: relative;
  overflow: hidden;
}

.card-body {
  padding: 24px;
}

.card-tag {
  display: inline-flex;
  align-items: center;
  padding: 7px 12px;
  border-radius: var(--radius-pill);
  background: rgba(20, 86, 240, 0.08);
  color: var(--primary-700);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.card h3,
.faq-item h3 {
  margin: 16px 0 10px;
  color: var(--text-strong);
  font-size: 17px;
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: -0.02em;
}

.card p,
.faq-item p {
  margin: 0;
  color: var(--text-main);
  font-size: 14px;
  line-height: 1.78;
}

.value-card::before,
.scene-card::before {
  content: "";
  position: absolute;
  inset: auto -20% 70% 30%;
  height: 160px;
  background: radial-gradient(circle, rgba(61, 174, 255, 0.18), transparent 72%);
  pointer-events: none;
}

.value-card:nth-child(2)::before,
.scene-card:nth-child(2)::before {
  background: radial-gradient(circle, rgba(20, 138, 106, 0.14), transparent 72%);
}

.value-card:nth-child(3)::before {
  background: radial-gradient(circle, rgba(74, 144, 226, 0.16), transparent 72%);
}

.scene-highlights,
.fit-points {
  display: grid;
  gap: 10px;
  margin-top: 16px;
}

.scene-highlights span,
.fit-points span {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  color: var(--text-main);
  font-size: 14px;
  line-height: 1.65;
}

.scene-highlights span::before,
.fit-points span::before {
  content: "";
  flex: 0 0 8px;
  width: 8px;
  height: 8px;
  margin-top: 8px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--brand-blue), var(--brand-green));
}

.capability-card {
  min-height: 100%;
  background: linear-gradient(180deg, #ffffff 0%, #f9fbff 100%);
}

.capability-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 4px;
  background: linear-gradient(135deg, rgba(31, 94, 255, 0.12), rgba(20, 138, 106, 0.14));
  color: var(--primary-700);
  font-size: 14px;
  font-weight: 700;
}

.band-section {
  padding-top: 8px;
  padding-bottom: 8px;
}

.band {
  padding: 30px 28px;
  border-radius: 10px;
  background: linear-gradient(135deg, #16202b 0%, #1b3551 48%, #0f6b57 100%);
  box-shadow: var(--shadow-card);
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 20px;
  align-items: center;
}

.band h2 {
  margin: 0 0 8px;
  color: #ffffff;
  font-size: clamp(20px, 2.4vw, 26px);
  font-weight: 300;
  line-height: 1.22;
}

.band p {
  margin: 0;
  max-width: 700px;
  color: rgba(255, 255, 255, 0.78);
  font-size: 14px;
  line-height: 1.75;
}

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

.faq-item {
  padding: 22px 24px;
}

.faq-item h3 {
  margin-top: 0;
}

.footer {
  max-width: 1260px;
  margin: 0 auto;
  padding: 38px 28px 60px;
  color: var(--text-soft);
}

.footer-box {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 20px;
  align-items: start;
  padding: 26px;
  border-radius: 10px;
  background: #ffffff;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-soft);
}

.footer-copy strong {
  display: block;
  margin-bottom: 10px;
  color: #000000;
  font-size: 18px;
  font-weight: 300;
}

.footer-copy p,
.footer-note {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
}

@media (max-width: 1120px) {
  .hero-grid,
  .facts-grid,
  .value-grid,
  .content-type-grid,
  .feature-list-grid,
  .capability-grid,
  .fit-grid,
  .scene-grid,
  .footer-box,
  .band {
    grid-template-columns: 1fr;
  }

  .section-head {
    align-items: flex-start;
    flex-direction: column;
  }

  .section-head-center {
    align-items: center;
  }
}

@media (max-width: 820px) {
  .nav {
    position: sticky;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
  }

  .nav-brand {
    flex: 1 1 auto;
    min-width: 0;
  }

  .nav-toggle {
    display: inline-flex;
    flex: 0 0 auto;
  }

  .nav-menu {
    display: none;
    width: 100%;
    margin-top: 14px;
    padding: 14px;
    border: 1px solid rgba(221, 230, 234, 0.96);
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-soft);
    flex-direction: column;
    align-items: stretch;
    gap: 14px;
  }

  .nav.is-open .nav-menu {
    display: flex;
  }

  .nav.is-open .nav-toggle span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .nav.is-open .nav-toggle span:nth-child(2) {
    opacity: 0;
  }

  .nav.is-open .nav-toggle span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  .nav-links {
    flex-direction: column;
    align-items: stretch;
    gap: 6px;
  }

  .nav-links a,
  .nav-cta {
    width: 100%;
    justify-content: center;
  }

  .hero {
    padding-top: 70px;
    padding-bottom: 72px;
  }

  .hero-copy {
    text-align: center;
  }

  .hero-lead {
    margin: 0 auto;
  }

  .hero-actions,
  .hero-proof,
  .hero-ai-strip {
    justify-content: center;
  }

  .hero-lead {
    font-size: 16px;
  }

  .card-body,
  .faq-item,
  .fact-card {
    padding: 22px;
  }
}

@media (max-width: 560px) {
  .nav,
  .hero,
  .section,
  .footer {
    padding-left: 18px;
    padding-right: 18px;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .button-dark,
  .button-light,
  .nav-cta {
    width: 100%;
  }

  .nav-menu {
    padding: 12px;
  }

  .band {
    padding: 24px 18px;
    border-radius: 8px;
  }

  .hero-title-main {
    font-size: clamp(30px, 9vw, 40px);
  }

  .hero-title-sub {
    font-size: 18px;
  }
}