:root {
  --ink:      #0b0b0d;
  --panel:    #17171b;
  --panel-2:  #1e1e23;
  --line:     #2b2b31;
  --paper:    #eee9dd;
  --dim:      #8d8d96;
  --neon:     #ff2f6d;
  --amber:    #ffb648;
  --green:    #3ddc8a;
  --red:      #ef5350;
  --r:        3px;
  --mono:     'JetBrains Mono','SF Mono',Consolas,monospace;
  --display:  'Chiron Sans HK',system-ui,sans-serif;
  --ui:       system-ui,-apple-system,'PingFang HK','Microsoft JhengHei',sans-serif;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background-color: var(--ink);
  background-image: var(--bg-pattern, repeating-linear-gradient(0deg, color-mix(in srgb, var(--paper) 1.4%, transparent) 0px, color-mix(in srgb, var(--paper) 1.4%, transparent) 1px, transparent 1px, transparent 3px));
  color: var(--paper); font-family: var(--ui); line-height: 1.6;
}
:focus-visible { outline: 2px solid var(--neon); outline-offset: 2px; }

/* ── Reveal on load / scroll ───────────────────────────── */
.reveal {
  opacity: 0; transform: translateY(18px);
  transition: opacity .7s ease, transform .7s ease;
}
.reveal.is-visible { opacity: 1; transform: none; }
.hero-eyebrow.reveal { transition-delay: .05s; }
.hero-sub.reveal     { transition-delay: .18s; }
.hero-actions.reveal { transition-delay: .3s; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* ── Rivets (industrial mounting-plate motif) ─────────── */
.riveted { position: relative; }
.riveted::before {
  content: "";
  position: absolute; inset: 0; pointer-events: none; opacity: .4;
  background:
    radial-gradient(circle 2.5px at 12px 12px, var(--dim) 96%, transparent 97%),
    radial-gradient(circle 2.5px at calc(100% - 12px) 12px, var(--dim) 96%, transparent 97%),
    radial-gradient(circle 2.5px at 12px calc(100% - 12px), var(--dim) 96%, transparent 97%),
    radial-gradient(circle 2.5px at calc(100% - 12px) calc(100% - 12px), var(--dim) 96%, transparent 97%);
}

/* ── Nav ─────────────────────────────────────────────── */
nav {
  position: sticky; top: 0; z-index: 99;
  background: color-mix(in srgb, var(--ink) 90%, transparent); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 6%; height: 56px;
}
.nav-brand { display: flex; align-items: center; }
.nav-logo { height: 30px; width: auto; display: block; mix-blend-mode: screen; }
.nav-actions { display: flex; align-items: center; gap: 10px; }
.social-icon { display: flex; align-items: center; color: var(--paper); transition: color .15s; }
.social-icon:hover { color: var(--neon); }
.lang-toggle {
  font-family: var(--mono); font-size: 11px; font-weight: 600; letter-spacing: .08em;
  background: var(--panel); border: 1px solid var(--line); color: var(--paper);
  padding: 6px 11px; border-radius: var(--r); cursor: pointer; transition: all .15s;
}
.lang-toggle:hover { border-color: var(--neon); color: var(--neon); }
.nav-cta {
  background: var(--neon); color: #fff;
  padding: 7px 16px; border-radius: var(--r);
  font-size: 13px; font-weight: 600; text-decoration: none;
  transition: opacity .15s;
}
.nav-cta:hover { opacity: .85; }

.nav-links { display: flex; align-items: center; gap: 18px; }
.nav-links a {
  color: var(--paper); font-size: 13px; font-weight: 600; text-decoration: none;
  transition: color .15s;
}
.nav-links a:hover, .nav-links a.active { color: var(--neon); }

/* Mobile-only trigger button showing the current page + a chevron. Stays in
   place in the nav bar at all times — only the dropdown panel (.nav-links,
   repurposed as the open/close-able list below) moves. */
.nav-toggle {
  display: none; align-items: center; gap: 5px;
  background: none; border: none; color: var(--paper);
  font-size: 13px; font-weight: 600; cursor: pointer; padding: 0;
}
.nav-toggle .chevron { font-size: 10px; transition: transform .15s; }
.nav-toggle.open .chevron { transform: rotate(180deg); }

@keyframes navDropdownIn {
  from { opacity: 0; transform: translate(-50%, -8px); }
  to   { opacity: 1; transform: translate(-50%, 0); }
}
@keyframes navItemIn {
  from { opacity: 0; transform: translateY(-4px); }
  to   { opacity: 1; transform: translateY(0); }
}
@media (max-width: 700px) {
  .nav-links { display: none; }
  .nav-toggle { display: flex; }
  .nav-links.open {
    display: flex; flex-direction: column; align-items: stretch; gap: 0;
    position: fixed; top: 56px; left: 50%;
    background: var(--panel); border: 1px solid var(--line); border-radius: 4px;
    padding: 6px 0; min-width: 150px; box-shadow: 0 8px 24px rgba(0,0,0,.4); z-index: 100;
    animation: navDropdownIn .25s ease forwards;
  }
  .nav-links.open a {
    padding: 9px 16px; text-align: center;
    opacity: 0; animation: navItemIn .3s ease forwards;
  }
  .nav-links.open a:nth-child(1) { animation-delay: .03s; }
  .nav-links.open a:nth-child(2) { animation-delay: .08s; }
  .nav-links.open a:nth-child(3) { animation-delay: .13s; }
  .nav-links.open a:nth-child(4) { animation-delay: .18s; }
}
@media (prefers-reduced-motion: reduce) {
  .nav-links.open, .nav-links.open a { animation: none; opacity: 1; }
}

.btn-primary {
  background: var(--neon); color: #fff; padding: 13px 28px;
  border-radius: var(--r); font-size: 14px; font-weight: 700; text-decoration: none;
  transition: all .15s; border: none; cursor: pointer;
}
.btn-primary:hover { background: color-mix(in srgb, var(--neon) 82%, white); transform: translateY(-1px); }
.btn-outline {
  background: color-mix(in srgb, var(--panel) 50%, transparent); backdrop-filter: blur(3px);
  color: var(--paper); padding: 13px 28px; border-radius: var(--r);
  font-size: 14px; font-weight: 600; text-decoration: none;
  border: 1px solid color-mix(in srgb, var(--paper) 38%, transparent); transition: all .15s;
}
.btn-outline:hover { border-color: var(--neon); color: var(--neon); }

/* ── Sections ────────────────────────────────────────── */
section { padding: 76px 6%; max-width: 1100px; margin: 0 auto; }
.section-label {
  font-family: var(--mono); font-size: 20px; letter-spacing: .18em;
  color: var(--neon); text-transform: uppercase; margin-bottom: 10px;
}
h2 { font-family: var(--display); font-size: clamp(24px, 4vw, 36px); font-weight: 700; line-height: 1.2; margin-bottom: 8px; }
.sub { color: var(--dim); font-size: 14px; margin-bottom: 36px; max-width: 46em; }

/* ── Footer ──────────────────────────────────────────── */
footer {
  border-top: 1px solid var(--line);
  padding: 26px 6%; text-align: center;
  font-family: var(--mono); font-size: 11px; letter-spacing: .04em; color: var(--dim);
}
footer span { color: var(--neon); }

@media (max-width: 540px) {
  section { padding: 56px 5%; }
  .btn-primary, .btn-outline { text-align: center; }
}