:root {
  --paper: #F7F6F3;
  --card: #FFFFFF;
  --ink: #111111;
  --ink-2: #6B6862;
  --ink-3: #8A8780;
  --accent: #185FA5;
  --line: rgba(0, 0, 0, 0.09);
  --line-2: rgba(0, 0, 0, 0.16);

  --dark: #0A0A0A;
  --dark-2: #151515;
  --dark-3: #1E1E1E;
  --dark-text: #8A8A8A;
  --dark-text-2: #A3A3A3;
  --accent-dark: #85B7EB;

  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --maxw: 1120px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; scroll-padding-top: 80px; }

body {
  font-family: var(--font);
  background: var(--paper);
  color: var(--ink);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 28px; }

/* ---------- nav ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(247, 246, 243, 0.88);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color .25s ease, background .25s ease;
}
.nav.scrolled { border-bottom-color: var(--line); }

.nav-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 28px;
  height: 64px;
  display: flex;
  align-items: center;
  gap: 32px;
}

.brand { display: flex; align-items: baseline; gap: 8px; }
.brand-mark {
  width: 18px; height: 18px; border-radius: 4px;
  background: var(--ink);
  align-self: center;
  flex: none;
}
.brand-name { font-size: 16px; font-weight: 500; letter-spacing: -.2px; }
.brand-en { font-size: 11px; color: var(--ink-3); letter-spacing: 1.4px; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 26px;
  margin-left: auto;
  font-size: 14px;
  color: var(--ink-2);
}
.nav-links a { transition: color .2s ease; }
.nav-links a:hover { color: var(--ink); }
.nav-ext { color: var(--accent) !important; }

.nav-actions { display: flex; align-items: center; gap: 12px; }

.menu-toggle {
  display: none;
  width: 36px; height: 36px;
  border: 1px solid var(--line-2);
  border-radius: 8px;
  background: transparent;
  cursor: pointer;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
}
.menu-toggle span {
  display: block; width: 15px; height: 1.5px;
  background: var(--ink);
  transition: transform .2s ease;
}
.menu-toggle[aria-expanded="true"] span:first-child { transform: translateY(2.75px) rotate(45deg); }
.menu-toggle[aria-expanded="true"] span:last-child { transform: translateY(-2.75px) rotate(-45deg); }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border-radius: 999px;
  font-size: 14px;
  padding: 8px 18px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: opacity .2s ease, background .2s ease, border-color .2s ease;
  white-space: nowrap;
}
.btn-lg { padding: 12px 26px; font-size: 15px; }
.btn-solid { background: var(--ink); color: #fff; }
.btn-solid:hover { opacity: .85; }
.btn-ghost { border-color: var(--line-2); color: var(--ink); }
.btn-ghost:hover { border-color: var(--ink); }
.btn-light { background: #fff; color: var(--dark); }
.btn-light:hover { opacity: .85; }
.arrow { display: inline-block; transition: transform .2s ease; }
a:hover .arrow { transform: translateX(3px); }

/* ---------- hero ---------- */
.hero { padding: 108px 0 88px; }
.eyebrow {
  font-size: 13px;
  color: var(--accent);
  letter-spacing: .6px;
  margin-bottom: 20px;
}
.hero-title {
  font-size: clamp(34px, 5.2vw, 58px);
  line-height: 1.18;
  letter-spacing: -1.4px;
  font-weight: 500;
  margin-bottom: 22px;
}
.hero-sub {
  font-size: 17px;
  color: var(--ink-2);
  line-height: 1.75;
  max-width: 560px;
  margin-bottom: 34px;
}
.hero-cta { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 56px; }

.hero-facts {
  display: flex;
  gap: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  flex-wrap: wrap;
}
.fact { display: flex; flex-direction: column; gap: 2px; }
.fact-num { font-size: 24px; font-weight: 500; letter-spacing: -.4px; }
.fact-label { font-size: 13px; color: var(--ink-3); }

/* ---------- section heads ---------- */
.sec-head { margin-bottom: 40px; }
.sec-tag {
  display: inline-block;
  font-size: 13px;
  color: var(--accent);
  letter-spacing: .6px;
  margin-bottom: 14px;
}
.sec-tag.dark { color: var(--accent-dark); }
.sec-title {
  font-size: clamp(26px, 3.2vw, 34px);
  font-weight: 500;
  letter-spacing: -.8px;
  line-height: 1.3;
}
.sec-title.dark { color: #fff; }
.sec-sub {
  margin-top: 14px;
  font-size: 16px;
  color: var(--dark-text-2);
  max-width: 520px;
}
.sec-sub.dark { color: var(--dark-text); }

/* ---------- services ---------- */
.services { padding: 88px 0; }
.cards {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 28px 26px 30px;
  display: flex;
  flex-direction: column;
  transition: border-color .2s ease;
}
.card:hover { border-color: var(--line-2); }
.card-num {
  font-size: 13px;
  color: var(--accent);
  margin-bottom: 16px;
  font-variant-numeric: tabular-nums;
}
.card h3 {
  font-size: 19px;
  font-weight: 500;
  letter-spacing: -.3px;
  margin-bottom: 10px;
}
.card p {
  font-size: 15px;
  color: var(--ink-2);
  line-height: 1.7;
}
.tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 18px;
}
.tags li {
  font-size: 12px;
  color: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 3px 11px;
}
.card-link {
  margin-top: 18px;
  font-size: 14px;
  color: var(--accent);
  align-self: flex-start;
}

/* ---------- video (dark) ---------- */
.video {
  background: var(--dark);
  color: #fff;
  padding: 88px 0 92px;
}
.showcase {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}
.shot { margin: 0; }
.shot-frame {
  position: relative;
  aspect-ratio: 16 / 9;
  background: var(--dark-3);
  border: 1px solid rgba(255, 255, 255, .1);
  border-radius: 10px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-color .2s ease, background .2s ease;
}
.shot:hover .shot-frame { border-color: rgba(255, 255, 255, .22); background: #242424; }
.shot-label { font-size: 13px; color: #5A5A5A; }
.shot figcaption {
  margin-top: 10px;
  font-size: 13px;
  color: var(--dark-text);
}
.video-cta { margin-top: 44px; }

/* ---------- about ---------- */
.about { padding: 88px 0; }
.reasons {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}
.reason {
  border-top: 1px solid var(--line-2);
  padding-top: 20px;
}
.reason h3 {
  font-size: 18px;
  font-weight: 500;
  letter-spacing: -.3px;
  margin-bottom: 10px;
}
.reason p { font-size: 15px; color: var(--ink-2); line-height: 1.7; }

.about-note {
  margin-top: 44px;
  padding: 26px 28px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
}
.about-note p { font-size: 15px; color: var(--ink-2); line-height: 1.8; }
.about-note strong { color: var(--ink); font-weight: 500; }

/* ---------- contact ---------- */
.contact { padding: 88px 0 100px; border-top: 1px solid var(--line); }
.contact-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 48px;
  align-items: start;
}
.contact-text {
  font-size: 16px;
  color: var(--ink-2);
  margin: 16px 0 32px;
  max-width: 460px;
}
.contact-items { display: flex; flex-direction: column; gap: 18px; }
.contact-item { display: flex; flex-direction: column; gap: 3px; }
.ci-label { font-size: 13px; color: var(--ink-3); }
.ci-value { font-size: 16px; }
a.ci-value:hover { color: var(--accent); }

.qr-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 22px;
  text-align: center;
}
.qr-box {
  aspect-ratio: 1 / 1;
  background: #EFEDE8;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  color: var(--ink-3);
}
.qr-note { margin-top: 14px; font-size: 13px; color: var(--ink-2); }

/* ---------- footer ---------- */
.footer {
  border-top: 1px solid var(--line);
  padding: 32px 0 40px;
}
.footer-inner {
  display: flex;
  align-items: center;
  gap: 28px;
  flex-wrap: wrap;
}
.footer-brand { display: flex; align-items: baseline; gap: 8px; }
.footer-links { display: flex; gap: 22px; font-size: 14px; color: var(--ink-2); margin-left: auto; }
.footer-links a:hover { color: var(--ink); }
.footer-copy { font-size: 13px; color: var(--ink-3); }

/* ---------- reveal ---------- */
.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .6s ease, transform .6s ease;
}
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ---------- responsive ---------- */
@media (max-width: 900px) {
  .cards, .showcase, .reasons, .contact-grid { grid-template-columns: 1fr 1fr; }
  .contact-grid { gap: 32px; }
}

@media (max-width: 720px) {
  .wrap, .nav-inner { padding: 0 20px; }
  .menu-toggle { display: flex; }
  .nav-links {
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    background: var(--paper);
    border-bottom: 1px solid var(--line);
    padding: 0 20px;
    max-height: 0;
    overflow: hidden;
    transition: max-height .28s ease, padding .28s ease;
  }
  .nav-links.open { max-height: 340px; padding: 8px 20px 20px; }
  .nav-links a { padding: 12px 0; font-size: 16px; border-bottom: 1px solid var(--line); width: 100%; }
  .nav-links a:last-child { border-bottom: none; }
  .nav-actions { margin-left: auto; }

  .hero { padding: 72px 0 64px; }
  .hero-facts { gap: 28px; }
  .services, .about { padding: 64px 0; }
  .video { padding: 64px 0 68px; }
  .contact { padding: 64px 0 72px; }
  .cards, .showcase, .reasons, .contact-grid { grid-template-columns: 1fr; }
  .footer-inner { flex-direction: column; align-items: flex-start; gap: 16px; }
  .footer-links { margin-left: 0; gap: 18px; flex-wrap: wrap; }
}