:root {
  --bg: #e9edf2;
  --bg-deep: #dfe5ee;
  --ink: #1c2430;
  --muted: #5a6573;
  --faint: #7a8696;
  --line: rgba(28, 36, 48, 0.12);
  --panel: rgba(255, 255, 255, 0.62);
  --accent: #1f4f9c;
  --accent-soft: rgba(31, 79, 156, 0.1);
  --font: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --display: "Noto Serif SC", "Songti SC", serif;
  --max: 760px;
  --radius: 10px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background:
    linear-gradient(180deg, #f3f5f8 0%, var(--bg) 28%, var(--bg-deep) 100%);
  line-height: 1.7;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

body.is-maintaining {
  overflow: hidden;
  height: 100vh;
}

body.is-maintaining > :not(.site-maintain) {
  visibility: hidden;
  pointer-events: none;
}

.site-maintain {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: grid;
  place-items: center;
  padding: 1.5rem;
  background:
    linear-gradient(180deg, #f3f5f8 0%, var(--bg) 45%, var(--bg-deep) 100%);
}

.site-maintain-inner {
  max-width: 22rem;
  text-align: center;
}

.site-maintain-brand {
  margin: 0;
  font-family: var(--display);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  color: var(--ink);
}

.site-maintain-inner h1 {
  margin: 1rem 0 0;
  font-family: var(--display);
  font-size: clamp(1.8rem, 6vw, 2.2rem);
  letter-spacing: 0.08em;
  font-weight: 700;
}

.site-maintain-text {
  margin: 0.75rem 0 0;
  color: var(--muted);
  font-size: 0.98rem;
}

.site-maintain-link {
  margin-top: 1.35rem;
}

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

button {
  font: inherit;
  border: 0;
  background: none;
  cursor: pointer;
  color: inherit;
}

.top {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  max-width: calc(var(--max) + 2.4rem);
  margin: 0 auto;
  padding: 0.95rem 1.2rem;
  backdrop-filter: blur(12px);
  background: rgba(243, 245, 248, 0.88);
  border-bottom: 1px solid var(--line);
}

.brand {
  font-family: var(--display);
  font-weight: 700;
  font-size: 1.45rem;
  letter-spacing: 0.18em;
  color: var(--ink);
}

.nav-toggle {
  display: none;
  font-size: 0.9rem;
  color: var(--muted);
  padding: 0.35rem 0.55rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.7);
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1.1rem;
  font-size: 0.92rem;
  color: var(--muted);
}

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

.hero {
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(3.2rem, 10vw, 5.5rem) 1.2rem 2.4rem;
}

.hero-meta {
  margin: 0;
  font-size: 0.84rem;
  letter-spacing: 0.08em;
  color: var(--faint);
}

.hero-brand {
  margin: 0.45rem 0 0;
  font-family: var(--display);
  font-size: clamp(3.4rem, 13vw, 5.6rem);
  line-height: 1.08;
  letter-spacing: 0.22em;
  color: var(--ink);
}

.hero-line {
  margin: 1.15rem 0 0;
  max-width: 26em;
  color: var(--muted);
  font-size: clamp(1.02rem, 2.5vw, 1.12rem);
}

.hero-cta {
  margin-top: 1.55rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  min-height: 44px;
  padding: 0.65rem 1.15rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.94rem;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.btn.primary {
  background: var(--ink);
  color: #f5f7fa;
}

.btn.primary:hover {
  background: #2a3444;
}

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

.btn.ghost:hover {
  border-color: rgba(28, 36, 48, 0.28);
}

.btn.soft {
  background: var(--accent-soft);
  color: var(--accent);
  border: 1px solid rgba(31, 79, 156, 0.18);
}

.btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.section {
  max-width: var(--max);
  margin: 0 auto;
  padding: 2.1rem 1.2rem;
}

.sec-head {
  margin-bottom: 1.15rem;
}

.sec-head h2,
.note-band h2 {
  margin: 0;
  font-family: var(--display);
  font-size: clamp(1.45rem, 3.5vw, 1.75rem);
  letter-spacing: 0.06em;
}

.sec-head p {
  margin: 0.55rem 0 0;
  color: var(--muted);
  max-width: 34em;
}

.product-list {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.product-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--line);
}

.product-logo {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  object-fit: cover;
  flex-shrink: 0;
}

.product-row:hover .product-go {
  color: var(--accent);
}

.product-main h3 {
  margin: 0;
  font-family: var(--display);
  font-size: 1.18rem;
  letter-spacing: 0.03em;
}

.product-main p {
  margin: 0.45rem 0 0;
  color: var(--muted);
  font-size: 0.95rem;
  max-width: 36em;
}

.product-go {
  flex-shrink: 0;
  margin-top: 0.2rem;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--faint);
}

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

.news-list li {
  display: grid;
  gap: 0.35rem;
  padding: 1.05rem 0;
  border-bottom: 1px solid var(--line);
}

@media (min-width: 640px) {
  .news-list li {
    grid-template-columns: 7.2rem 1fr;
    gap: 1rem;
  }
}

.news-list time {
  font-size: 0.82rem;
  color: var(--faint);
  font-variant-numeric: tabular-nums;
}

.news-list h3 {
  margin: 0;
  font-size: 1.02rem;
}

.news-list p {
  margin: 0.3rem 0 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.note-band {
  margin-top: 0.4rem;
  margin-bottom: 0.4rem;
  padding-top: 1.8rem;
  padding-bottom: 1.8rem;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: linear-gradient(90deg, rgba(255, 255, 255, 0.45), transparent 70%);
}

.note-band p {
  margin: 0.7rem 0 0;
  max-width: 34em;
  color: var(--muted);
  font-size: 1.02rem;
}

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

.timeline li {
  position: relative;
  display: grid;
  gap: 0.25rem 1rem;
  padding: 0 0 1.35rem 1.15rem;
}

@media (min-width: 640px) {
  .timeline li {
    grid-template-columns: 5.5rem 1fr;
  }
}

.timeline li::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 0.55rem;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--ink);
}

.timeline time {
  font-size: 0.84rem;
  color: var(--faint);
  font-variant-numeric: tabular-nums;
}

.timeline h3 {
  margin: 0;
  font-size: 1.02rem;
}

.timeline p {
  margin: 0.3rem 0 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.people {
  display: grid;
  gap: 1.4rem 1.6rem;
}

@media (min-width: 720px) {
  .people {
    grid-template-columns: repeat(3, 1fr);
  }
}

.person-role {
  margin: 0 0 0.25rem;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--faint);
}

.person h3 {
  margin: 0;
  font-family: var(--display);
  font-size: 1.2rem;
  letter-spacing: 0.04em;
}

.person p:last-child {
  margin: 0.4rem 0 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.join-lines {
  margin: 0 0 1.2rem;
  display: grid;
  gap: 0.55rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.join-lines strong {
  color: var(--ink);
  font-weight: 700;
  margin-right: 0.35rem;
}

.contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
}

.contact-note {
  margin: 0.85rem 0 0;
  color: var(--faint);
  font-size: 0.86rem;
}

.foot {
  max-width: var(--max);
  margin: 0 auto;
  padding: 1.5rem 1.2rem 2.6rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  justify-content: space-between;
  color: var(--faint);
  font-size: 0.88rem;
  border-top: 1px solid var(--line);
}

.foot-links {
  display: flex;
  gap: 1rem;
}

.foot a:hover {
  color: var(--accent);
}

@media (max-width: 760px) {
  .nav-toggle {
    display: inline-flex;
  }

  .nav {
    display: none;
    position: absolute;
    right: 1rem;
    top: calc(100% + 0.35rem);
    flex-direction: column;
    gap: 0.1rem;
    min-width: 148px;
    padding: 0.45rem;
    border-radius: 10px;
    border: 1px solid var(--line);
    background: #f7f8fa;
    box-shadow: 0 10px 28px rgba(28, 36, 48, 0.1);
  }

  .top {
    position: sticky;
  }

  .nav.open {
    display: flex;
  }

  .nav a {
    padding: 0.45rem 0.55rem;
    border-radius: 6px;
  }

  .nav a:hover {
    background: rgba(28, 36, 48, 0.05);
  }
}

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