:root {
  --ink: #18212c;
  --muted: #5c6a7a;
  --line: rgba(24, 33, 44, 0.1);
  --accent: #2f6b8a;
  --accent-deep: #1f4f68;
  --paper: #eef2f5;
  --surface: rgba(255, 255, 255, 0.55);
  --font-display: "Noto Serif SC", "Songti SC", serif;
  --font-body: "Noto Sans SC", "PingFang SC", sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

.bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(ellipse 70% 45% at 0% 0%, #d5e4ee 0%, transparent 58%),
    radial-gradient(ellipse 55% 40% at 100% 8%, #e2e8ef 0%, transparent 52%),
    linear-gradient(165deg, #e8eef3 0%, #eef2f5 42%, #e6ebe8 100%);
}

.bg::after {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.4;
  background-image:
    linear-gradient(rgba(24, 33, 44, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(24, 33, 44, 0.035) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.5), transparent 80%);
}

.top {
  max-width: 740px;
  margin: 0 auto;
  padding: 1.35rem 1.35rem 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: 0.03em;
  opacity: 0;
  animation: rise 0.65s ease forwards;
}

.nav {
  display: flex;
  gap: 1.15rem;
  opacity: 0;
  animation: rise 0.65s ease 0.08s forwards;
}

.nav a {
  font-size: 0.88rem;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

main {
  max-width: 740px;
  margin: 0 auto;
  padding: 1.75rem 1.35rem 3.5rem;
}

.hero {
  padding: 2.75rem 0 3rem;
  border-bottom: 1px solid var(--line);
}

.eyebrow {
  margin: 0 0 0.85rem;
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  opacity: 0;
  animation: rise 0.7s ease 0.12s forwards;
}

.hero h1 {
  margin: 0 0 1.05rem;
  font-family: var(--font-display);
  font-size: clamp(2.35rem, 6.5vw, 3.25rem);
  font-weight: 600;
  line-height: 1.22;
  letter-spacing: 0.01em;
  opacity: 0;
  animation: rise 0.75s ease 0.2s forwards;
}

.lead {
  margin: 0;
  max-width: 32em;
  font-size: 1.05rem;
  color: var(--muted);
  opacity: 0;
  animation: rise 0.75s ease 0.3s forwards;
}

.cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.1rem;
  margin-top: 1.75rem;
  opacity: 0;
  animation: rise 0.75s ease 0.4s forwards;
}

.btn {
  display: inline-flex;
  align-items: center;
  padding: 0.65rem 1.25rem;
  background: var(--ink);
  color: #f4f7fa;
  text-decoration: none;
  font-size: 0.92rem;
  letter-spacing: 0.02em;
  transition: background 0.2s ease, transform 0.2s ease;
}

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

.link {
  color: var(--accent);
  text-decoration: none;
  font-size: 0.92rem;
  border-bottom: 1px solid rgba(47, 107, 138, 0.35);
  transition: color 0.2s ease, border-color 0.2s ease;
}

.link:hover {
  color: var(--accent-deep);
  border-bottom-color: var(--accent-deep);
}

section + section {
  margin-top: 2.85rem;
}

h2 {
  margin: 0 0 0.9rem;
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.about p,
.contact p {
  margin: 0;
  color: var(--muted);
  max-width: 38em;
}

.focus ul {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.focus li {
  display: flex;
  align-items: baseline;
  gap: 1.15rem;
  padding: 1.05rem 0.15rem;
  border-bottom: 1px solid var(--line);
  color: var(--ink);
  transition: padding-left 0.25s ease, background 0.25s ease;
}

.focus li:hover {
  padding-left: 0.45rem;
  background: linear-gradient(90deg, var(--surface), transparent);
}

.idx {
  flex-shrink: 0;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}

.contact a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 107, 138, 0.35);
  transition: border-color 0.2s ease, color 0.2s ease;
}

.contact a:hover {
  color: var(--accent-deep);
  border-bottom-color: var(--accent-deep);
}

.foot {
  max-width: 740px;
  margin: 0 auto;
  padding: 1.5rem 1.35rem 2.5rem;
  border-top: 1px solid var(--line);
  font-size: 0.84rem;
  color: var(--muted);
}

.foot p {
  margin: 0;
}

.beian {
  margin-top: 0.4rem !important;
}

.beian a {
  color: var(--muted);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 540px) {
  .top {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
  }

  .nav {
    gap: 1rem;
  }

  .hero {
    padding-top: 1.85rem;
    padding-bottom: 2.25rem;
  }

  .cta {
    margin-top: 1.4rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }

  .brand,
  .nav,
  .eyebrow,
  .hero h1,
  .lead,
  .cta {
    opacity: 1;
  }
}