:root {
  --ink: #121820;
  --ink-soft: #3a4553;
  --muted: #6b7585;
  --paper: #f4f6f8;
  --panel: #ffffff;
  --line: #d7dde6;
  --teal: #0f6e6a;
  --teal-deep: #0a4f4c;
  --glow: rgba(15, 110, 106, 0.28);
  --font-sans: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", sans-serif;
  --font-serif: "Noto Serif SC", "Songti SC", serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: var(--font-sans);
  font-weight: 400;
  line-height: 1.7;
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
}

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

.page-bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(1100px 600px at 85% -10%, rgba(15, 110, 106, 0.14), transparent 60%),
    radial-gradient(900px 500px at -10% 20%, rgba(18, 24, 32, 0.06), transparent 55%),
    linear-gradient(180deg, #eef2f5 0%, #f4f6f8 45%, #e9eef2 100%);
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  width: 100%;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  background: rgba(244, 246, 248, 0.88);
  border-bottom: 1px solid rgba(215, 221, 230, 0.85);
}

.topbar-inner {
  box-sizing: border-box;
  width: 100%;
  max-width: 1080px;
  margin: 0 auto;
  padding: 1rem 1.75rem;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  column-gap: 2rem;
}

.brand {
  display: inline-block;
  justify-self: start;
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--ink);
  white-space: nowrap;
  line-height: 1;
}

.nav {
  display: flex;
  flex-direction: row;
  flex-wrap: nowrap;
  align-items: center;
  justify-content: flex-end;
  gap: 2rem;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 0.95rem;
  color: var(--ink-soft);
  white-space: nowrap;
}

.nav a {
  position: relative;
  display: inline-block;
  padding: 0.35rem 0;
  line-height: 1;
  transition: color 0.25s ease;
}

.nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: var(--teal);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s ease;
}

.nav a:hover {
  color: var(--teal-deep);
}

.nav a:hover::after {
  transform: scaleX(1);
}

.hero {
  position: relative;
  min-height: calc(100vh - 60px);
  max-width: 1080px;
  margin: 0 auto;
  padding: 4.5rem 1.5rem 4rem;
  display: grid;
  align-items: center;
  overflow: hidden;
}

.hero-visual {
  position: absolute;
  inset: 8% 0 12% auto;
  width: min(52%, 520px);
  pointer-events: none;
}

.hero-grid {
  position: absolute;
  inset: 10% 8% 10% 0;
  border: 1px solid rgba(18, 24, 32, 0.08);
  background-image:
    linear-gradient(rgba(18, 24, 32, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(18, 24, 32, 0.05) 1px, transparent 1px);
  background-size: 36px 36px;
  mask-image: linear-gradient(135deg, transparent 10%, #000 45%, #000 80%, transparent);
  animation: grid-drift 18s linear infinite;
}

.hero-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(2px);
}

.hero-orb-a {
  width: 280px;
  height: 280px;
  right: 8%;
  top: 12%;
  background: radial-gradient(circle at 35% 35%, rgba(15, 110, 106, 0.45), transparent 65%);
  animation: float-a 9s ease-in-out infinite;
}

.hero-orb-b {
  width: 180px;
  height: 180px;
  right: 38%;
  bottom: 18%;
  background: radial-gradient(circle at 40% 40%, rgba(18, 24, 32, 0.18), transparent 70%);
  animation: float-b 11s ease-in-out infinite;
}

.hero-copy {
  position: relative;
  z-index: 1;
  max-width: 640px;
  animation: rise 0.9s ease both;
}

.hero-en {
  margin: 0 0 1rem;
  color: var(--teal);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.22em;
}

.hero h1 {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(2rem, 4.6vw, 3.15rem);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: 0.02em;
}

.hero-lead {
  margin: 1.35rem 0 0;
  max-width: 32rem;
  color: var(--ink-soft);
  font-size: 1.08rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  margin-top: 2rem;
}

.btn-primary,
.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.75rem;
  padding: 0 1.35rem;
  border-radius: 2px;
  font-size: 0.95rem;
  font-weight: 500;
  transition: transform 0.2s ease, background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.btn-primary {
  background: var(--teal);
  color: #fff;
}

.btn-primary:hover {
  background: var(--teal-deep);
  transform: translateY(-1px);
}

.btn-ghost {
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.55);
  color: var(--ink);
}

.btn-ghost:hover {
  border-color: var(--teal);
  color: var(--teal-deep);
}

.section {
  padding: 5.5rem 1.5rem;
}

.section-inner {
  max-width: 1080px;
  margin: 0 auto;
}

.eyebrow {
  margin: 0 0 0.75rem;
  color: var(--teal);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.18em;
}

.section h2 {
  margin: 0;
  max-width: 18em;
  font-family: var(--font-serif);
  font-size: clamp(1.55rem, 3vw, 2.1rem);
  font-weight: 700;
  line-height: 1.35;
}

.about {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.55), rgba(255, 255, 255, 0.85));
  border-block: 1px solid rgba(215, 221, 230, 0.85);
}

.about-body {
  margin-top: 1.75rem;
  max-width: 46rem;
  color: var(--ink-soft);
  font-size: 1.05rem;
}

.about-body p {
  margin: 0 0 1.1rem;
}

.about-body p:last-child {
  margin-bottom: 0;
}

.biz-list {
  list-style: none;
  margin: 2.5rem 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.biz-list li {
  display: grid;
  grid-template-columns: 4.5rem 1fr;
  gap: 1.25rem;
  padding: 1.55rem 0;
  border-bottom: 1px solid var(--line);
  opacity: 0;
  transform: translateY(14px);
  animation: rise 0.7s ease forwards;
}

.biz-list li:nth-child(1) { animation-delay: 0.05s; }
.biz-list li:nth-child(2) { animation-delay: 0.15s; }
.biz-list li:nth-child(3) { animation-delay: 0.25s; }
.biz-list li:nth-child(4) { animation-delay: 0.35s; }

.biz-index {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  color: var(--teal);
  letter-spacing: 0.06em;
  padding-top: 0.15rem;
}

.biz-list h3 {
  margin: 0 0 0.4rem;
  font-size: 1.12rem;
  font-weight: 700;
}

.biz-list p {
  margin: 0;
  color: var(--muted);
  font-size: 0.98rem;
}

.site-footer {
  padding: 2.75rem 1.5rem 3rem;
  background: var(--ink);
  color: rgba(244, 246, 248, 0.82);
}

.footer-inner {
  max-width: 1080px;
  margin: 0 auto;
  text-align: center;
}

.footer-name {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 1.05rem;
  color: #fff;
  letter-spacing: 0.06em;
}

.footer-meta {
  margin: 0.85rem 0 0;
  font-size: 0.9rem;
}

.footer-meta a {
  color: rgba(244, 246, 248, 0.78);
  border-bottom: 1px solid rgba(244, 246, 248, 0.28);
  transition: color 0.2s ease, border-color 0.2s ease;
}

.footer-meta a:hover {
  color: #fff;
  border-color: rgba(255, 255, 255, 0.7);
}

.footer-copy {
  margin: 0.85rem 0 0;
  font-size: 0.82rem;
  color: rgba(244, 246, 248, 0.5);
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(18px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes float-a {
  0%, 100% { transform: translate3d(0, 0, 0) scale(1); }
  50% { transform: translate3d(12px, -18px, 0) scale(1.04); }
}

@keyframes float-b {
  0%, 100% { transform: translate3d(0, 0, 0); }
  50% { transform: translate3d(-16px, 10px, 0); }
}

@keyframes grid-drift {
  from { background-position: 0 0, 0 0; }
  to { background-position: 36px 36px, 36px 36px; }
}

@media (max-width: 760px) {
  .hero {
    min-height: auto;
    padding-top: 3.2rem;
    padding-bottom: 3.5rem;
  }

  .hero-visual {
    width: 100%;
    inset: auto 0 0 0;
    height: 42%;
    opacity: 0.55;
  }

  .hero-copy {
    max-width: none;
  }

  .biz-list li {
    grid-template-columns: 3rem 1fr;
    gap: 0.85rem;
  }

  .topbar-inner {
    padding: 0.9rem 1.15rem;
    column-gap: 1rem;
  }

  .brand {
    font-size: 1.05rem;
    letter-spacing: 0.08em;
  }

  .nav {
    gap: 1.15rem;
    font-size: 0.88rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .hero-copy,
  .biz-list li,
  .hero-orb-a,
  .hero-orb-b,
  .hero-grid {
    animation: none !important;
    opacity: 1;
    transform: none;
  }
}