/* =====================================================================
   Lumidao (Hong Kong) Consulting Limited — site stylesheet
   No external dependencies: system fonts only, no CDN, no tracking.
   ===================================================================== */

:root {
  --navy: #0b1f3a;
  --navy-deep: #071527;
  --ink: #1c2430;
  --muted: #5b6673;
  --line: #d9dee5;
  --paper: #ffffff;
  --paper-alt: #f4f6f9;
  --accent: #b08d57;
  --accent-dark: #8f6f3f;
  --max: 1120px;
  --radius: 6px;
  --serif: Georgia, "Times New Roman", "Songti SC", "PMingLiU", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue",
          Arial, "Noto Sans", "PingFang HK", "Microsoft JhengHei", sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.65;
  color: var(--ink);
  background: var(--paper);
}

img { max-width: 100%; display: block; }

a { color: var(--navy); text-decoration: none; }
a:hover { color: var(--accent-dark); }

h1, h2, h3, h4 {
  font-family: var(--serif);
  font-weight: 400;
  line-height: 1.2;
  color: var(--navy);
  margin: 0 0 .5em;
  letter-spacing: -0.01em;
}
h1 { font-size: clamp(2rem, 4.5vw, 3.25rem); }
h2 { font-size: clamp(1.6rem, 3vw, 2.25rem); }
h3 { font-size: 1.3rem; }
p  { margin: 0 0 1.1em; }

.container {
  width: 100%;
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 24px;
}

.eyebrow {
  display: inline-block;
  font-size: .78rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--accent-dark);
  margin-bottom: 1rem;
}

.lead { font-size: 1.2rem; color: var(--muted); max-width: 44em; }

.skip-link {
  position: absolute; left: -999px; top: 8px;
  background: var(--navy); color: #fff; padding: 8px 12px; z-index: 100;
}
.skip-link:focus { left: 8px; }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.96);
  border-bottom: 1px solid var(--line);
  backdrop-filter: saturate(140%) blur(6px);
}
.site-header .container {
  display: flex; align-items: center; justify-content: space-between;
  height: 72px;
}
.brand {
  display: flex; align-items: center; gap: 12px;
  font-family: var(--serif); font-size: 1.25rem; color: var(--navy);
  letter-spacing: .02em;
}
.brand svg { width: 42px; height: 42px; flex: none; }
.brand small {
  display: block; font-family: var(--sans); font-size: .68rem;
  letter-spacing: .14em; text-transform: uppercase; color: var(--muted);
  line-height: 1;
}

.nav ul { list-style: none; margin: 0; padding: 0; display: flex; gap: 32px; }
.nav a {
  font-size: .95rem; padding: 6px 0; position: relative; color: var(--ink);
}
.nav a::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -2px;
  height: 2px; background: var(--accent); transform: scaleX(0);
  transform-origin: left; transition: transform .2s ease;
}
.nav a:hover::after, .nav a[aria-current="page"]::after { transform: scaleX(1); }
.nav a[aria-current="page"] { color: var(--navy); }

.nav-toggle {
  display: none; background: none; border: 1px solid var(--line);
  border-radius: var(--radius); padding: 8px 10px; cursor: pointer;
}
.nav-toggle span {
  display: block; width: 22px; height: 2px; background: var(--navy); margin: 5px 0;
  transition: transform .2s ease, opacity .2s ease;
}

/* ---------- Hero ---------- */
.hero {
  background:
    radial-gradient(1200px 500px at 85% -10%, rgba(176,141,87,.22), transparent 60%),
    linear-gradient(180deg, var(--navy-deep), var(--navy));
  color: #e9edf3;
  padding: 96px 0 88px;
  position: relative; overflow: hidden;
}
.hero::before {
  content: ""; position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.035) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: linear-gradient(180deg, rgba(0,0,0,.8), transparent);
  pointer-events: none;
}
.hero .container { position: relative; }
.hero h1 { color: #fff; max-width: 17em; }
.hero .eyebrow { color: var(--accent); }
.hero .lead { color: #c5cedb; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 2rem; }

.hero--inner { padding: 72px 0 56px; }
.hero--inner h1 { font-size: clamp(1.9rem, 3.8vw, 2.8rem); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-block; padding: 13px 26px; border-radius: var(--radius);
  font-size: .95rem; letter-spacing: .02em; border: 1px solid transparent;
  transition: background .2s ease, color .2s ease, border-color .2s ease;
}
.btn-primary { background: var(--accent); color: #fff; border-color: var(--accent); }
.btn-primary:hover { background: var(--accent-dark); border-color: var(--accent-dark); color: #fff; }
.btn-outline { color: #fff; border-color: rgba(255,255,255,.45); }
.btn-outline:hover { border-color: #fff; color: #fff; }
.btn-navy { background: var(--navy); color: #fff; border-color: var(--navy); }
.btn-navy:hover { background: var(--navy-deep); color: #fff; }

/* ---------- Sections ---------- */
.section { padding: 80px 0; }
.section-alt { background: var(--paper-alt); }
.section-head { max-width: 46em; margin-bottom: 44px; }
.section-head p { color: var(--muted); }

.grid { display: grid; gap: 28px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 30px 28px; position: relative;
  transition: box-shadow .2s ease, transform .2s ease;
}
.card:hover { box-shadow: 0 10px 30px rgba(11,31,58,.08); transform: translateY(-2px); }
.card .num {
  font-family: var(--serif); font-size: .95rem; color: var(--accent-dark);
  letter-spacing: .1em; margin-bottom: 14px; display: block;
}
.card h3 { font-size: 1.2rem; }
.card p { color: var(--muted); font-size: .97rem; margin-bottom: 0; }
.card .more { display: inline-block; margin-top: 16px; font-size: .9rem; color: var(--navy); }
.card .more::after { content: " \2192"; }

/* Dual engine */
.engine {
  display: grid; grid-template-columns: 1fr auto 1fr; gap: 28px; align-items: stretch;
}
.engine .card { padding: 36px 32px; }
.engine .card h3 { font-size: 1.45rem; }
.engine .plus {
  display: flex; align-items: center; justify-content: center;
  font-family: var(--serif); font-size: 2.4rem; color: var(--accent);
}
.engine ul { padding-left: 1.1em; margin: 1em 0 0; color: var(--muted); font-size: .97rem; }
.engine li { margin-bottom: .45em; }

/* Prose pages */
.prose { max-width: 46em; }
.prose h2 { margin-top: 2.2em; }
.prose h2:first-child { margin-top: 0; }
.prose ul { padding-left: 1.2em; }
.prose li { margin-bottom: .5em; }

.service-block {
  display: grid; grid-template-columns: 1fr 2fr; gap: 40px;
  padding: 48px 0; border-top: 1px solid var(--line);
}
.service-block:first-of-type { border-top: 0; padding-top: 0; }
.service-block h2 { font-size: 1.7rem; }
.service-block .tag { color: var(--accent-dark); font-size: .8rem; letter-spacing: .16em; text-transform: uppercase; }
.service-block ul { padding-left: 1.1em; color: var(--muted); }
.service-block li { margin-bottom: .5em; }

.steps { counter-reset: step; list-style: none; padding: 0; margin: 0; display: grid; gap: 22px; }
.steps li {
  counter-increment: step; position: relative; padding-left: 64px;
}
.steps li::before {
  content: counter(step, decimal-leading-zero);
  position: absolute; left: 0; top: 0;
  font-family: var(--serif); font-size: 1.6rem; color: var(--accent);
}
.steps h3 { font-size: 1.15rem; margin-bottom: .25em; }
.steps p { color: var(--muted); margin: 0; }

.principles { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.principles div { border-top: 2px solid var(--accent); padding-top: 18px; }
.principles h3 { font-size: 1.1rem; }
.principles p { color: var(--muted); font-size: .95rem; margin: 0; }

/* Contact */
.contact-grid { display: grid; grid-template-columns: 1.1fr 1fr; gap: 48px; }
.contact-list { list-style: none; padding: 0; margin: 0; }
.contact-list li { padding: 18px 0; border-bottom: 1px solid var(--line); }
.contact-list li:first-child { border-top: 1px solid var(--line); }
.contact-list strong {
  display: block; font-size: .78rem; letter-spacing: .16em; text-transform: uppercase;
  color: var(--muted); font-weight: 600; margin-bottom: 4px;
}
.note {
  background: var(--paper-alt); border-left: 3px solid var(--accent);
  padding: 18px 22px; border-radius: 0 var(--radius) var(--radius) 0; color: var(--muted);
  font-size: .95rem;
}

/* CTA band */
.cta {
  background: var(--navy); color: #d7deea; padding: 72px 0;
}
.cta h2 { color: #fff; }
.cta .container { display: flex; justify-content: space-between; align-items: center; gap: 32px; flex-wrap: wrap; }
.cta p { margin: 0; max-width: 36em; }

/* ---------- Footer ---------- */
.site-footer {
  background: var(--navy-deep); color: #9aa7b8; padding: 56px 0 32px; font-size: .9rem;
}
.site-footer .container { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 40px; }
.site-footer h4 { color: #fff; font-family: var(--sans); font-size: .8rem; letter-spacing: .16em; text-transform: uppercase; margin-bottom: 14px; }
.site-footer a { color: #c9d2df; }
.site-footer a:hover { color: var(--accent); }
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer li { margin-bottom: 8px; }
.site-footer .brand { color: #fff; margin-bottom: 14px; }
.site-footer .brand small { color: #9aa7b8; }
.footer-bottom {
  grid-column: 1 / -1; border-top: 1px solid rgba(255,255,255,.1);
  padding-top: 22px; margin-top: 12px; font-size: .82rem;
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px;
}

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .engine { grid-template-columns: 1fr; }
  .engine .plus { padding: 4px 0; }
  .principles { grid-template-columns: 1fr; }
  .service-block { grid-template-columns: 1fr; gap: 16px; }
  .site-footer .container { grid-template-columns: 1fr 1fr; }
  .site-footer .container > div:first-child { grid-column: 1 / -1; }
}

@media (max-width: 720px) {
  body { font-size: 16px; }
  .section { padding: 56px 0; }
  .hero { padding: 64px 0 56px; }
  .grid-2, .grid-4, .contact-grid { grid-template-columns: 1fr; }
  .site-footer .container { grid-template-columns: 1fr; }

  .nav-toggle { display: block; }
  .nav {
    position: absolute; left: 0; right: 0; top: 72px;
    background: #fff; border-bottom: 1px solid var(--line);
    display: none; padding: 12px 24px 20px;
  }
  .nav.is-open { display: block; }
  .nav ul { flex-direction: column; gap: 4px; }
  .nav a { display: block; padding: 12px 0; font-size: 1.05rem; border-bottom: 1px solid var(--paper-alt); }
  .nav a::after { display: none; }
  .nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
  .nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
}

@media print {
  .site-header, .nav-toggle, .cta, .hero-actions { display: none; }
  body { font-size: 12pt; color: #000; }
  a::after { content: " (" attr(href) ")"; font-size: .85em; }
}

/* ---------- Utilities (kept so the site needs no inline styles under a strict CSP) ---------- */
.cta-link { color: #fff; text-decoration: underline; }
.cta-link:hover { color: var(--accent); }
.mt-lg { margin-top: 28px; }
.mb-0 { margin-bottom: 0; }

/* Anchored sections stop below the sticky header instead of underneath it */
.service-block[id] { scroll-margin-top: 90px; }
address { font-style: normal; }