:root {
  --bg: #07111f;
  --bg-soft: #0d1a2c;
  --panel: rgba(9, 20, 35, 0.78);
  --panel-strong: rgba(10, 24, 42, 0.92);
  --line: rgba(148, 163, 184, 0.18);
  --line-strong: rgba(148, 163, 184, 0.28);
  --text: #e2ebf7;
  --muted: #98a8be;
  --accent: #22c1c3;
  --accent-2: #f2b15a;
  --accent-3: #6ee7b7;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.36);
  --radius-lg: 28px;
  --radius-md: 20px;
  --radius-sm: 14px;
  --container: min(1160px, calc(100vw - 48px));
  --font-sans: "Avenir Next", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    "Noto Sans SC", sans-serif;
  --font-mono: "SFMono-Regular", "JetBrains Mono", "Consolas", monospace;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  font-family: var(--font-sans);
  background:
    radial-gradient(circle at top left, rgba(34, 193, 195, 0.14), transparent 34%),
    radial-gradient(circle at 80% 20%, rgba(242, 177, 90, 0.18), transparent 28%),
    linear-gradient(180deg, #081220 0%, #07111f 45%, #0a1424 100%);
  line-height: 1.65;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -2;
  content: "";
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 36px 36px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.75), transparent 95%);
}

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

button {
  font: inherit;
}

.container {
  width: var(--container);
  margin: 0 auto;
}

.section {
  padding: 88px 0;
}

.section-alt {
  background: rgba(9, 20, 35, 0.42);
  backdrop-filter: blur(10px);
}

.site-shell {
  position: relative;
  overflow: clip;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  transition: background-color 0.3s ease, border-color 0.3s ease, backdrop-filter 0.3s ease;
  border-bottom: 1px solid transparent;
}

.site-header.is-scrolled {
  background: rgba(7, 17, 31, 0.82);
  border-color: rgba(148, 163, 184, 0.16);
  backdrop-filter: blur(18px);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 84px;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
}

.brand-mark {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  width: 38px;
  height: 38px;
  padding: 8px;
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(34, 193, 195, 0.22), rgba(242, 177, 90, 0.18));
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.08);
}

.brand-mark span,
.equation-symbol span {
  display: block;
  height: 4px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
}

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

.brand-copy strong {
  font-size: 1rem;
  letter-spacing: 0.08em;
}

.brand-copy small {
  font-size: 0.72rem;
  color: var(--muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 26px;
  font-size: 0.95rem;
  color: var(--muted);
}

.site-nav a {
  position: relative;
}

.site-nav a::after {
  position: absolute;
  left: 0;
  bottom: -8px;
  width: 100%;
  height: 2px;
  border-radius: 999px;
  content: "";
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s ease;
}

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

.nav-toggle {
  display: none;
  width: 48px;
  height: 48px;
  padding: 0;
  border: 1px solid rgba(148, 163, 184, 0.24);
  border-radius: 14px;
  background: rgba(9, 20, 35, 0.7);
  color: var(--text);
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 5px auto;
  border-radius: 999px;
  background: currentColor;
}

.hero {
  padding-top: 72px;
}

.hero-grid,
.contact-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: 40px;
  align-items: center;
}

.eyebrow {
  margin: 0 0 18px;
  color: var(--accent-3);
  font-family: var(--font-mono);
  font-size: 0.86rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.hero h1,
.section-heading h2 {
  margin: 0;
  letter-spacing: -0.03em;
  line-height: 1.08;
}

.hero h1 {
  max-width: 12ch;
  font-size: clamp(3rem, 5vw, 5.6rem);
}

.hero-text,
.section-heading p,
.story-card p,
.service-card p,
.value-card p,
.process-card p,
.contact-panel li {
  color: var(--muted);
}

.hero-text {
  max-width: 620px;
  margin: 22px 0 0;
  font-size: 1.08rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 32px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  padding: 0 22px;
  border-radius: 999px;
  border: 1px solid transparent;
  transition: transform 0.2s ease, background-color 0.2s ease, border-color 0.2s ease;
}

.button:hover,
.button:focus-visible {
  transform: translateY(-2px);
}

.button-primary {
  background: linear-gradient(135deg, var(--accent), #17b6dd);
  color: #03131b;
  font-weight: 700;
}

.button-secondary {
  border-color: rgba(148, 163, 184, 0.28);
  background: rgba(9, 20, 35, 0.42);
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
}

.hero-tags li {
  padding: 10px 14px;
  border: 1px solid rgba(148, 163, 184, 0.16);
  border-radius: 999px;
  background: rgba(9, 20, 35, 0.5);
  color: #c6d2e4;
  font-size: 0.92rem;
}

.hero-visual {
  position: relative;
}

.equation-card,
.story-card,
.service-card,
.value-card,
.process-card,
.quote-card,
.contact-panel {
  position: relative;
  border: 1px solid rgba(148, 163, 184, 0.14);
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, rgba(14, 27, 44, 0.92), rgba(8, 17, 30, 0.92));
  box-shadow: var(--shadow);
}

.equation-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 84px minmax(0, 1fr);
  gap: 16px;
  padding: 28px;
}

.equation-side {
  padding: 12px;
}

.equation-label,
.signal-label {
  display: inline-block;
  margin-bottom: 14px;
  color: var(--accent-2);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.equation-side h2 {
  margin: 0 0 10px;
  font-size: 1.7rem;
}

.equation-side p {
  margin: 0;
  color: var(--muted);
}

.equation-symbol {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 14px;
  padding: 0 12px;
}

.hero-matrix {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-top: 18px;
}

.hero-matrix article,
.signal-grid > div {
  padding: 18px;
  border: 1px solid rgba(148, 163, 184, 0.12);
  border-radius: var(--radius-md);
  background: rgba(9, 20, 35, 0.62);
}

.hero-matrix span {
  display: block;
  margin-bottom: 8px;
  font-weight: 700;
}

.hero-matrix p,
.signal-grid p {
  margin: 0;
  color: var(--muted);
}

.signal-band {
  padding: 20px 0;
}

.signal-grid,
.about-grid,
.service-grid,
.value-grid {
  display: grid;
  gap: 22px;
}

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

.section-heading {
  max-width: 760px;
  margin-bottom: 34px;
}

.section-heading h2 {
  font-size: clamp(2.1rem, 4vw, 3.4rem);
}

.section-heading p {
  margin: 18px 0 0;
  font-size: 1.04rem;
}

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

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

.story-card,
.service-card,
.value-card,
.contact-panel {
  padding: 28px;
}

.story-card h3,
.service-card h3,
.value-card h3,
.contact-panel h3,
.process-card h3 {
  margin: 0 0 12px;
  font-size: 1.35rem;
}

.service-card span,
.process-card span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  border-radius: 16px;
  background: linear-gradient(135deg, rgba(34, 193, 195, 0.24), rgba(242, 177, 90, 0.22));
  color: var(--accent-3);
  font-family: var(--font-mono);
  font-size: 0.94rem;
}

.process-list {
  display: grid;
  gap: 18px;
}

.process-card {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  gap: 18px;
  padding: 22px 24px;
  align-items: start;
}

.quote-section {
  padding-top: 28px;
}

.quote-card {
  padding: 42px;
  text-align: center;
}

.quote-mark {
  margin: 0;
  color: var(--accent-2);
  font-size: 5rem;
  line-height: 1;
}

blockquote {
  max-width: 820px;
  margin: 10px auto 0;
  color: #dbe7f7;
  font-size: clamp(1.35rem, 2vw, 2rem);
  line-height: 1.55;
}

.contact-panel ul {
  margin: 18px 0 28px;
  padding-left: 20px;
}

.contact-panel li + li {
  margin-top: 12px;
}

.site-footer {
  padding: 28px 0 36px;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding-top: 20px;
  border-top: 1px solid rgba(148, 163, 184, 0.14);
  color: var(--muted);
  font-size: 0.92rem;
}

/* Scroll reveal keeps motion restrained and focused on section entry. */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

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

@media (max-width: 1024px) {
  .hero-grid,
  .contact-grid,
  .about-grid,
  .value-grid,
  .service-grid,
  .signal-grid {
    grid-template-columns: 1fr;
  }

  .hero h1 {
    max-width: 100%;
  }

  .equation-card {
    grid-template-columns: 1fr;
  }

  .equation-symbol {
    flex-direction: row;
    align-items: center;
    justify-content: flex-start;
    gap: 10px;
  }

  .equation-symbol span {
    width: 36px;
  }

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

@media (max-width: 760px) {
  .section {
    padding: 72px 0;
  }

  .header-inner {
    min-height: 74px;
  }

  .nav-toggle {
    display: inline-block;
  }

  .site-nav {
    position: absolute;
    top: calc(100% + 10px);
    right: 24px;
    left: 24px;
    display: grid;
    gap: 10px;
    padding: 18px;
    border: 1px solid rgba(148, 163, 184, 0.16);
    border-radius: 22px;
    background: rgba(8, 17, 30, 0.95);
    box-shadow: var(--shadow);
    opacity: 0;
    pointer-events: none;
    transform: translateY(-8px);
    transition: opacity 0.2s ease, transform 0.2s ease;
  }

  .site-nav.is-open {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }

  .hero {
    padding-top: 48px;
  }

  .hero h1 {
    font-size: clamp(2.5rem, 12vw, 4rem);
  }

  .quote-card {
    padding: 28px 22px;
  }

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

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

  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}