/* =========================================================
   Blue Fintech Hong Kong - Shared Styles
   ========================================================= */
:root{
  --navy: #0a1e3f;
  --navy-2: #0e2650;
  --navy-3: #172f5c;
  --navy-soft: #1e3a68;
  --navy-mute: #6b7a95;
  --paper: #ffffff;
  --paper-warm: #fafbfc;
  --line: #e2e6ee;
  --line-dark: rgba(255,255,255,0.12);
  --accent: #1f5fbf;
  --accent-2: #4d94ff;
  --accent-glow: rgba(77,148,255,0.4);

  --max-w: 1280px;
  --ease: cubic-bezier(.2,.7,.2,1);
}

*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--navy);
  background: #ffffff;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }

/* Typographic base */
h1, h2, h3, h4 {
  font-family: 'Manrope', sans-serif;
  font-weight: 500;
  letter-spacing: -0.01em;
  margin: 0;
  color: var(--navy);
}
h1 { font-size: clamp(38px, 6vw, 72px); line-height: 1.05; letter-spacing: -0.02em; }
h2 { font-size: clamp(28px, 3.4vw, 44px); line-height: 1.15; }
h3 { font-size: clamp(20px, 1.8vw, 26px); line-height: 1.3; }
p { margin: 0 0 1em; }

.mono {
  font-family: 'JetBrains Mono', monospace;
  font-weight: 400;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  font-size: 11px;
  color: var(--navy-mute);
}
.eyebrow {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--accent);
  display: inline-flex; align-items: center; gap: 10px;
}
.eyebrow::before {
  content: '';
  display: inline-block;
  width: 24px; height: 1px;
  background: var(--accent);
}

/* Buttons */
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 14px 26px;
  border-radius: 4px;
  font-family: 'Manrope', sans-serif;
  font-weight: 500;
  font-size: 14px;
  letter-spacing: 0.06em;
  cursor: pointer;
  border: none;
  transition: all 0.3s var(--ease);
  text-transform: uppercase;
}
.btn-primary {
  background: var(--navy);
  color: #fff;
}
.btn-primary:hover {
  background: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 10px 24px -8px rgba(31,95,191,.4);
}
.btn-ghost {
  background: transparent;
  color: var(--navy);
  border: 1px solid var(--navy);
}
.btn-ghost:hover {
  background: var(--navy); color: #fff;
}
.btn-ghost-light {
  background: transparent;
  color: #fff;
  border: 1px solid rgba(255,255,255,0.4);
}
.btn-ghost-light:hover {
  background: #fff; color: var(--navy); border-color: #fff;
}
.btn .arrow {
  display: inline-block;
  transition: transform 0.3s var(--ease);
}
.btn:hover .arrow { transform: translateX(4px); }

/* =========================================================
   Navigation
   ========================================================= */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 20px 0;
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: all 0.3s var(--ease);
}
.nav.scrolled {
  padding: 14px 0;
  border-bottom-color: var(--line);
}
.nav.dark {
  background: rgba(10,30,63,0.9);
}
.nav.dark .nav-link { color: rgba(255,255,255,0.7); }
.nav.dark .nav-link:hover, .nav.dark .nav-link.active { color: #fff; }
.nav.dark .brand-name .n1 { color: #fff; }
.nav.dark .brand-name .n2 { color: rgba(255,255,255,0.6); }
.nav.dark .lang-toggle { border-color: rgba(255,255,255,0.2); color: rgba(255,255,255,0.8); }
.nav.dark .lang-toggle button.active { background: #fff; color: var(--navy); }
.nav.dark .menu-btn span { background: #fff; }

.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 32px;
  display: flex; align-items: center; justify-content: space-between;
  gap: 24px;
}
.brand {
  display: flex; align-items: center; gap: 14px;
  cursor: pointer;
}
.brand-logo { width: 56px; height: 56px; flex: 0 0 auto; transition: width 0.3s var(--ease), height 0.3s var(--ease); }
.nav.scrolled .brand-logo { width: 46px; height: 46px; }
.brand-name { display: flex; flex-direction: column; line-height: 1.05; }
.brand-name .n1 {
  font-family: 'Manrope', sans-serif; font-weight: 600;
  font-size: 17px; letter-spacing: 0.01em; color: var(--navy);
  transition: color 0.3s;
}
.brand-name .n2 {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px; letter-spacing: 0.28em;
  color: var(--navy-mute);
  margin-top: 4px; text-transform: uppercase;
  transition: color 0.3s;
}

.nav-links {
  display: flex; align-items: center; gap: 32px;
  list-style: none; margin: 0; padding: 0;
}
.nav-link {
  font-family: 'Manrope', sans-serif;
  font-weight: 500;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--navy-mute);
  text-transform: uppercase;
  transition: color 0.3s;
  position: relative;
  padding: 6px 0;
}
.nav-link:hover, .nav-link.active { color: var(--navy); }
.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 0; right: 0;
  height: 2px; background: var(--accent);
}

.nav-actions {
  display: flex; align-items: center; gap: 16px;
}
.lang-toggle {
  display: flex; border: 1px solid var(--line);
  border-radius: 4px; overflow: hidden;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px; letter-spacing: 0.16em;
}
.lang-toggle button {
  padding: 6px 10px;
  border: none; background: transparent;
  color: var(--navy-mute);
  cursor: pointer;
  transition: all 0.2s;
}
.lang-toggle button.active {
  background: var(--navy); color: #fff;
}

.menu-btn {
  display: none;
  background: transparent; border: none; padding: 8px;
  cursor: pointer;
}
.menu-btn span {
  display: block; width: 24px; height: 2px;
  background: var(--navy); margin: 5px 0;
  transition: transform 0.3s, opacity 0.3s;
}

/* =========================================================
   Sections
   ========================================================= */
.section {
  padding: 120px 0;
  position: relative;
}
.section-sm { padding: 80px 0; }
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 32px;
}
.section-head {
  max-width: 640px;
  margin-bottom: 64px;
}
.section-head.centered { margin-left: auto; margin-right: auto; text-align: center; }
.section-head .eyebrow { margin-bottom: 24px; }
.section-head h2 { margin-bottom: 20px; }
.section-head p {
  font-size: 17px; color: var(--navy-mute); line-height: 1.7;
}

/* =========================================================
   Footer
   ========================================================= */
.footer {
  background: var(--navy);
  color: rgba(255,255,255,0.7);
  padding: 80px 0 32px;
  position: relative;
  overflow: hidden;
}
.footer::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent-2), transparent);
  opacity: 0.5;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 64px;
}
.footer h4 {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.5);
  margin-bottom: 20px;
  font-weight: 400;
}
.footer .brand-logo { width: 64px; height: 64px; }
.footer .brand-name .n1 { color: #fff; font-size: 19px; }
.footer .brand-name .n2 { color: rgba(255,255,255,0.5); font-size: 11px; }
.footer .brand { margin-bottom: 24px; }
.footer .tagline {
  font-size: 14px; line-height: 1.7;
  color: rgba(255,255,255,0.6);
  max-width: 320px;
}
.footer ul { list-style: none; padding: 0; margin: 0; }
.footer ul li { margin-bottom: 10px; font-size: 14px; }
.footer ul a { color: rgba(255,255,255,0.7); transition: color 0.2s; }
.footer ul a:hover { color: var(--accent-2); }
.footer address {
  font-style: normal; font-size: 13px; line-height: 1.7;
  color: rgba(255,255,255,0.6);
}
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding-top: 32px;
  display: flex; justify-content: space-between; align-items: center;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px; letter-spacing: 0.16em;
  color: rgba(255,255,255,0.4);
  text-transform: uppercase;
}

/* =========================================================
   Reveal on scroll
   ========================================================= */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.9s var(--ease), transform 0.9s var(--ease);
}
.reveal.visible {
  opacity: 1; transform: none;
}
.reveal[data-delay="1"] { transition-delay: 0.1s; }
.reveal[data-delay="2"] { transition-delay: 0.2s; }
.reveal[data-delay="3"] { transition-delay: 0.3s; }
.reveal[data-delay="4"] { transition-delay: 0.4s; }
.reveal[data-delay="5"] { transition-delay: 0.5s; }

/* =========================================================
   Responsive
   ========================================================= */
@media (max-width: 900px) {
  .section { padding: 80px 0; }
  .container, .nav-inner { padding: 0 20px; }
  .nav-links {
    position: fixed;
    top: 68px; left: 0; right: 0;
    background: #fff;
    flex-direction: column; align-items: flex-start;
    padding: 24px 20px;
    gap: 20px;
    border-bottom: 1px solid var(--line);
    transform: translateY(-120%);
    transition: transform 0.4s var(--ease);
  }
  .nav-links.open { transform: translateY(0); }
  .nav.dark .nav-links { background: var(--navy-2); }
  .menu-btn { display: block; }
  .nav-actions { gap: 12px; }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 40px;
  }
  .footer-bottom {
    flex-direction: column; gap: 12px; text-align: center;
  }
}
@media (max-width: 560px) {
  .footer-grid { grid-template-columns: 1fr; }
  .brand-name .n2 { display: none; }
}