:root {
  --color-ink: #10233f;
  --color-deep: #17355b;
  --color-navy: #1f4675;
  --color-cream: #f4efe5;
  --color-paper: #f8f4ed;
  --color-line: rgba(16, 35, 63, 0.14);
  --color-accent: #b9935a;
  --color-soft: rgba(255, 255, 255, 0.78);
  --shadow-soft: 0 24px 80px rgba(16, 35, 63, 0.12);
  --shadow-card: 0 20px 50px rgba(16, 35, 63, 0.08);
  --radius-lg: 28px;
  --radius-md: 18px;
  --radius-sm: 12px;
  --font-display: 'Noto Serif SC', 'Songti SC', 'STSong', serif;
  --font-body: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  background:
    radial-gradient(circle at top left, rgba(185, 147, 90, 0.12), transparent 28%),
    radial-gradient(circle at top right, rgba(31, 70, 117, 0.18), transparent 34%),
    linear-gradient(180deg, #fbf8f1 0%, #f4efe5 38%, #f8f5ee 100%);
  color: var(--color-ink);
  font-family: var(--font-body);
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(16, 35, 63, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(16, 35, 63, 0.03) 1px, transparent 1px);
  background-size: 28px 28px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.3), transparent 82%);
}

.site-shell {
  position: relative;
  width: min(1280px, calc(100% - 40px));
  margin: 0 auto;
  padding-bottom: 64px;
}

.topbar {
  position: sticky;
  top: 16px;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin: 20px 0 32px;
  padding: 16px 20px;
  border: 1px solid rgba(255, 255, 255, 0.8);
  border-radius: 999px;
  background: rgba(248, 244, 237, 0.76);
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow-card);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  color: inherit;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  border-radius: 14px;
  background: linear-gradient(145deg, var(--color-ink), var(--color-navy));
  color: #fff;
  font-family: var(--font-display);
  font-size: 1.3rem;
  letter-spacing: 0.16em;
  box-shadow: 0 16px 30px rgba(16, 35, 63, 0.28);
}

.brand-copy {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.brand-copy strong {
  font-family: var(--font-display);
  font-size: 1.1rem;
}

.brand-copy span {
  color: rgba(16, 35, 63, 0.7);
  font-size: 0.88rem;
}

.topnav {
  display: flex;
  align-items: center;
  gap: 18px;
}

.topnav a,
.contact-list a,
.button,
.topbar-cta {
  transition: transform 180ms ease, opacity 180ms ease, color 180ms ease, border-color 180ms ease;
}

.topnav a {
  position: relative;
  color: rgba(16, 35, 63, 0.74);
  text-decoration: none;
  font-size: 0.95rem;
}

.topnav a::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: -8px;
  height: 2px;
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 180ms ease;
}

.topnav a:hover,
.topnav a.is-active {
  color: var(--color-ink);
}

.topnav a:hover::after,
.topnav a.is-active::after {
  transform: scaleX(1);
}

.topbar-cta,
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 20px;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 600;
}

.topbar-cta,
.button-primary {
  background: linear-gradient(135deg, var(--color-ink), var(--color-navy));
  color: #fff;
  box-shadow: 0 16px 30px rgba(16, 35, 63, 0.24);
}

.button-secondary {
  border: 1px solid var(--color-line);
  color: var(--color-ink);
  background: rgba(255, 255, 255, 0.72);
}

.hero-panel,
.content-section,
.footer {
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.74);
  border-radius: calc(var(--radius-lg) + 4px);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.76), rgba(255, 255, 255, 0.55));
  box-shadow: var(--shadow-soft);
}

.hero-panel {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(360px, 0.92fr);
  gap: 32px;
  padding: 48px;
  min-height: 720px;
}

.hero-panel::before,
.content-section::before,
.footer::before {
  content: '';
  position: absolute;
  inset: 1px;
  border-radius: inherit;
  border: 1px solid rgba(255, 255, 255, 0.5);
  pointer-events: none;
}

.hero-copy {
  align-self: center;
  padding-right: 12px;
}

.eyebrow,
.section-kicker,
.architecture-label,
.disclaimer-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  border-radius: 999px;
  border: 1px solid rgba(185, 147, 90, 0.26);
  background: rgba(185, 147, 90, 0.12);
  color: var(--color-deep);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.hero-copy h1 {
  margin: 22px 0 14px;
  font-family: var(--font-display);
  font-size: clamp(3.4rem, 7vw, 6rem);
  line-height: 0.95;
  letter-spacing: 0.08em;
  color: var(--color-ink);
}

.hero-subtitle {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 2.4vw, 2rem);
  color: var(--color-deep);
}

.hero-description,
.section-heading p,
.pain-card p,
.advantage-card p,
.architecture-card p,
.footer-copy,
.disclaimer-card p {
  font-size: 1rem;
  line-height: 1.82;
  color: rgba(16, 35, 63, 0.78);
}

.hero-description {
  max-width: 640px;
  margin: 22px 0 32px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.hero-board {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 24px;
  padding: 28px;
  border-radius: var(--radius-lg);
  background:
    radial-gradient(circle at top left, rgba(255, 255, 255, 0.9), transparent 36%),
    linear-gradient(160deg, rgba(16, 35, 63, 0.98), rgba(31, 70, 117, 0.94));
  color: #fff;
}

.hero-board::after {
  content: '';
  position: absolute;
  inset: 18px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 24px;
  pointer-events: none;
}

.board-grid {
  display: grid;
  gap: 18px;
}

.board-card {
  padding: 20px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
}

.board-card span,
.board-metric-strip span {
  display: block;
  margin-bottom: 10px;
  color: rgba(255, 255, 255, 0.66);
  font-size: 0.84rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.board-card strong,
.board-metric-strip strong {
  display: block;
  font-size: 1.12rem;
  margin-bottom: 8px;
}

.board-card p,
.board-metric-strip div {
  margin: 0;
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.78);
}

.board-card-accent {
  background: linear-gradient(145deg, rgba(185, 147, 90, 0.18), rgba(255, 255, 255, 0.1));
}

.board-metric-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.board-metric-strip div {
  padding: 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.14);
}

.content-section,
.footer {
  margin-top: 24px;
  padding: 38px 42px 42px;
}

.section-heading {
  max-width: 760px;
  margin-bottom: 28px;
}

.section-heading h2,
.footer h2 {
  margin: 16px 0 14px;
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1.2;
  color: var(--color-ink);
}

.pain-grid,
.advantage-grid,
.architecture-layout,
.footer-grid {
  display: grid;
  gap: 18px;
}

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

.pain-card,
.advantage-card,
.architecture-card,
.disclaimer-card {
  padding: 22px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--color-line);
  box-shadow: var(--shadow-card);
}

.pain-card strong,
.advantage-card h3,
.architecture-card h3 {
  display: block;
  margin-bottom: 12px;
  font-size: 1.16rem;
  color: var(--color-ink);
}

.capabilities-section {
  background:
    linear-gradient(180deg, rgba(16, 35, 63, 0.05), rgba(255, 255, 255, 0.5)),
    linear-gradient(180deg, rgba(255, 255, 255, 0.8), rgba(255, 255, 255, 0.55));
}

.capability-timeline {
  display: grid;
  gap: 18px;
}

.timeline-step {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr);
  gap: 18px;
  align-items: start;
  padding: 22px 18px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(16, 35, 63, 0.09);
  background: rgba(255, 255, 255, 0.62);
  box-shadow: var(--shadow-card);
}

.timeline-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 72px;
  height: 72px;
  border-radius: 20px;
  background: linear-gradient(145deg, var(--color-ink), var(--color-navy));
  color: #fff;
  font-family: var(--font-display);
  font-size: 1.4rem;
  letter-spacing: 0.08em;
}

.timeline-step h3 {
  margin: 0 0 8px;
  font-size: 1.2rem;
}

.timeline-step p {
  margin: 0;
  line-height: 1.82;
  color: rgba(16, 35, 63, 0.8);
}

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

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

.architecture-card-wide {
  grid-column: 1 / -1;
}

.footer-grid {
  grid-template-columns: minmax(0, 1.2fr) minmax(320px, 0.8fr);
  align-items: start;
}

.contact-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 20px;
}

.contact-list a,
.contact-list span {
  color: var(--color-ink);
  text-decoration: none;
}

.disclaimer-card {
  background: linear-gradient(180deg, rgba(16, 35, 63, 0.96), rgba(23, 53, 91, 0.92));
  color: rgba(255, 255, 255, 0.86);
  border-color: rgba(255, 255, 255, 0.1);
}

.disclaimer-card p {
  color: rgba(255, 255, 255, 0.76);
}

[data-scroll] {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 500ms ease, transform 500ms ease;
}

[data-scroll].is-visible {
  opacity: 1;
  transform: translateY(0);
}

.topbar-cta:hover,
.button:hover,
.contact-list a:hover {
  transform: translateY(-1px);
}

@media (max-width: 1120px) {
  .topbar {
    border-radius: 28px;
    padding: 18px;
    flex-wrap: wrap;
  }

  .topnav {
    order: 3;
    width: 100%;
    justify-content: space-between;
    flex-wrap: wrap;
  }

  .hero-panel,
  .pain-grid,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .board-metric-strip,
  .advantage-grid,
  .architecture-layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .site-shell {
    width: min(100% - 24px, 1280px);
  }

  .topbar {
    position: static;
    margin-top: 12px;
  }

  .hero-panel,
  .content-section,
  .footer {
    padding: 26px 20px 24px;
    border-radius: 24px;
  }

  .hero-panel {
    min-height: auto;
  }

  .hero-copy h1 {
    letter-spacing: 0.04em;
  }

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

  .timeline-index {
    width: 60px;
    height: 60px;
    border-radius: 16px;
  }

  .button,
  .topbar-cta {
    width: 100%;
  }

  .hero-actions {
    flex-direction: column;
  }
}