/* ==========================================================================
   Global Layout Pty Ltd — Design Tokens
   A letterhead-and-seal system: warm parchment neutrals, an espresso-brown
   ground, and a brass accent that stands in for an official stamp/seal —
   fitting a firm whose job is turning formal visits into real outcomes.
   ========================================================================== */
:root {
  /* Colour */
  --ink:            #241a12;   /* primary text, warm near-black */
  --ink-soft:       #5a4c3f;   /* secondary text */
  --paper:          #f7f2e7;   /* base background, warm parchment */
  --paper-alt:      #efe4cf;   /* alternating section background */
  --paper-line:     rgba(36, 26, 18, 0.12);
  --espresso:       #2e2013;   /* deep brown ground (hero / approach / footer) */
  --espresso-soft:  #4a3520;
  --brass:          #a9812e;   /* seal / accent */
  --brass-deep:     #8a6a24;
  --cream:          #f2e9d8;   /* light text/lines on dark ground */
  --white:          #fffdf9;

  /* Type */
  --font-display: "Songti SC", "STSong", "Noto Serif SC", Georgia, "Times New Roman", serif;
  --font-body: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;

  /* Layout */
  --container-w: 1180px;
  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.75rem;
  --space-4: 2.75rem;
  --space-5: 4.5rem;
  --space-6: 7rem;
  --radius: 3px;
}

/* ==========================================================================
   Reset & base
   ========================================================================== */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.3;
  margin: 0 0 var(--space-2);
  color: var(--ink);
  letter-spacing: 0.01em;
}
h1 { font-size: clamp(2.1rem, 4.4vw, 3.4rem); font-weight: 500; }
h2 { font-size: clamp(1.6rem, 3vw, 2.2rem); }
h3 { font-size: 1.15rem; }
p { margin: 0 0 var(--space-2); }
a { color: inherit; text-decoration: none; }
ul { margin: 0; padding: 0; list-style: none; }
img, svg { display: block; max-width: 100%; }

.container { max-width: var(--container-w); margin: 0 auto; padding: 0 var(--space-3); }

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}
.skip-link {
  position: absolute; left: -999px; top: 0; background: var(--espresso); color: var(--white);
  padding: 0.75rem 1.25rem; z-index: 200; border-radius: 0 0 var(--radius) 0;
}
.skip-link:focus { left: 0; }

a:focus-visible, button:focus-visible {
  outline: 2px solid var(--brass);
  outline-offset: 3px;
}

/* Eyebrow + signature "letterhead rule": a thin brass line with a centred
   diamond — the one recurring device that ties every section back to the
   idea of an official seal / letterhead, used sparingly and consistently. */
.eyebrow {
  font-family: var(--font-body);
  font-size: 0.8rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--brass-deep);
  margin: 0;
}
.eyebrow-light { color: var(--brass); }

.rule {
  width: 64px;
  height: 1px;
  background: var(--paper-line);
  margin: var(--space-2) 0 var(--space-3);
  position: relative;
}
.rule::after {
  content: "";
  position: absolute;
  left: 0; top: -3px;
  width: 6px; height: 6px;
  background: var(--brass);
  transform: rotate(45deg);
}
.rule-light { background: rgba(242, 233, 216, 0.25); }
.rule-light::after { background: var(--brass); }

.section { padding: var(--space-6) 0; }
.section-note { color: var(--ink-soft); max-width: 62ch; }
.lede { color: var(--ink-soft); max-width: 62ch; }

.text-link {
  display: inline-block;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--brass-deep);
  border-bottom: 1px solid var(--paper-line);
  padding-bottom: 3px;
  transition: border-color 0.25s ease, color 0.25s ease, transform 0.25s ease;
}
.text-link:hover { border-color: var(--brass-deep); transform: translateX(2px); }
.text-link-light { color: var(--cream); border-color: rgba(242,233,216,0.35); }
.text-link-light:hover { border-color: var(--brass); color: var(--white); }

/* ==========================================================================
   Header
   ========================================================================== */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(247, 242, 231, 0.92);
  backdrop-filter: saturate(140%) blur(8px);
  border-bottom: 1px solid var(--paper-line);
}
.header-inner {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0.9rem var(--space-3);
  display: flex;
  align-items: center;
  gap: var(--space-3);
}
.brand { display: flex; align-items: center; gap: 0.65rem; margin-right: auto; }
.brand-mark { color: var(--brass-deep); flex-shrink: 0; }
.brand-text { display: flex; flex-direction: column; line-height: 1.2; }
.brand-cn { font-family: var(--font-display); font-size: 1.05rem; font-weight: 600; }
.brand-en { font-size: 0.62rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink-soft); }

.main-nav ul { display: flex; gap: var(--space-3); }
.main-nav a {
  font-size: 0.92rem;
  color: var(--ink-soft);
  position: relative;
  padding: 0.3rem 0.05rem;
  transition: color 0.2s ease;
  white-space: nowrap;
}
.main-nav a::after {
  content: "";
  position: absolute; left: 0; right: 100%; bottom: -2px; height: 1px;
  background: var(--brass-deep);
  transition: right 0.25s ease;
}
.main-nav a:hover, .main-nav a.is-active { color: var(--ink); }
.main-nav a:hover::after, .main-nav a.is-active::after { right: 0; }

.header-actions { display: flex; align-items: center; gap: var(--space-3); }
.lang-switch { display: flex; align-items: center; gap: 0.4rem; font-size: 0.85rem; color: var(--ink-soft); }
.lang-switch a { padding: 0.15rem 0.15rem; }
.lang-switch a.is-active { color: var(--brass-deep); font-weight: 700; }
.lang-switch a:hover { color: var(--ink); }

.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 34px; height: 34px;
  background: none; border: none; cursor: pointer; padding: 0;
}
.menu-toggle span { display: block; width: 100%; height: 1.5px; background: var(--ink); transition: transform 0.25s ease, opacity 0.25s ease; }
.menu-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.menu-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.menu-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* ==========================================================================
   Hero
   ========================================================================== */
.hero {
  position: relative;
  background: linear-gradient(180deg, var(--espresso) 0%, var(--espresso-soft) 100%);
  color: var(--cream);
  padding: var(--space-6) 0 var(--space-5);
  overflow: hidden;
  min-height: 78vh;
  display: flex;
  align-items: flex-end;
}
.hero-scene {
  position: absolute; inset: 0;
  color: rgba(242, 233, 216, 0.14);
}
.skyline { width: 100%; height: 100%; position: absolute; bottom: 0; left: 0; }
.hero-content {
  position: relative;
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 var(--space-3);
  width: 100%;
  animation: hero-rise 0.9s cubic-bezier(.2,.7,.2,1) both;
}
@keyframes hero-rise {
  from { opacity: 0; transform: translateY(18px); }
  to { opacity: 1; transform: translateY(0); }
}
.hero h1 { color: var(--white); max-width: 18ch; margin-top: 0.6rem; }
.hero-tagline { color: var(--cream); opacity: 0.85; font-size: 1.05rem; max-width: 46ch; margin-top: var(--space-2); }
.hero-links { display: flex; flex-wrap: wrap; gap: var(--space-4); margin-top: var(--space-4); }

/* ==========================================================================
   About
   ========================================================================== */
.about-grid {
  display: grid;
  grid-template-columns: 1.3fr 0.7fr;
  gap: var(--space-5);
  align-items: center;
}
.about-figure { color: var(--paper-line); justify-self: center; }
.seal-figure { width: 220px; color: var(--brass); opacity: 0.55; }

/* ==========================================================================
   Capabilities
   ========================================================================== */
.capability-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--paper-line);
  border: 1px solid var(--paper-line);
}
.capability-card {
  background: var(--paper);
  padding: var(--space-4) var(--space-3);
  transition: background 0.25s ease, transform 0.25s ease;
}
.capability-card:hover { background: var(--white); transform: translateY(-3px); }
.card-icon { display: inline-flex; color: var(--brass-deep); width: 34px; height: 34px; margin-bottom: var(--space-2); }
.capability-card h3 { margin-bottom: 0.4rem; font-size: 1.05rem; }
.capability-card p { color: var(--ink-soft); font-size: 0.92rem; margin: 0; }

/* ==========================================================================
   Sectors
   ========================================================================== */
.section-sectors { background: var(--paper-alt); }
.sector-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--paper-line);
  border: 1px solid var(--paper-line);
  margin-bottom: var(--space-3);
}
.sector-list li {
  background: var(--paper-alt);
  padding: var(--space-2) var(--space-2);
  font-size: 0.92rem;
  color: var(--ink-soft);
}

/* ==========================================================================
   Approach
   ========================================================================== */
.section-approach { background: var(--espresso); color: var(--cream); }
.approach-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
  margin-bottom: var(--space-4);
}
.approach-col h3 { color: var(--white); font-size: 1rem; letter-spacing: 0.04em; margin-bottom: var(--space-2); }
.approach-col li {
  padding: 0.55rem 0;
  border-top: 1px solid rgba(242,233,216,0.14);
  font-size: 0.92rem;
  color: rgba(242,233,216,0.82);
}
.approach-col li:last-child { border-bottom: 1px solid rgba(242,233,216,0.14); }
.approach-line { font-family: var(--font-display); font-size: 1.15rem; color: var(--white); margin: 0; }

/* ==========================================================================
   CTA
   ========================================================================== */
.section-cta { padding: var(--space-5) 0; }
.cta-inner { text-align: center; max-width: 52ch; margin: 0 auto; }
.cta-inner h2 { margin-bottom: var(--space-3); }

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer { background: var(--paper-alt); border-top: 1px solid var(--paper-line); }
.footer-inner {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: var(--space-5) var(--space-3) var(--space-4);
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: var(--space-4);
}
.footer-brand .brand-cn { display: block; font-family: var(--font-display); font-size: 1.2rem; }
.footer-brand .brand-en { display: block; font-size: 0.7rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink-soft); margin: 0.2rem 0 var(--space-2); }
.footer-tagline { color: var(--ink-soft); font-size: 0.88rem; max-width: 32ch; }
.footer-col h3 { font-size: 0.85rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--brass-deep); margin-bottom: var(--space-2); }
.footer-col ul li { margin-bottom: 0.55rem; font-size: 0.92rem; }
.footer-col a:hover { color: var(--brass-deep); }
.footer-contact li { display: flex; flex-direction: column; gap: 0.15rem; }
.footer-contact span { font-size: 0.72rem; color: var(--ink-soft); text-transform: uppercase; letter-spacing: 0.06em; }
.footer-bottom {
  border-top: 1px solid var(--paper-line);
  padding: var(--space-2) var(--space-3);
  text-align: center;
  font-size: 0.8rem;
  color: var(--ink-soft);
}

/* ==========================================================================
   Scroll reveal (progressive enhancement via IntersectionObserver)
   ========================================================================== */
.reveal { opacity: 0; transform: translateY(16px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal-in { opacity: 1; transform: translateY(0); }
.hero.reveal { opacity: 1; transform: none; } /* hero has its own entrance animation */

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 980px) {
  .main-nav { display: none; }
  .menu-toggle { display: flex; }
  .header-actions { gap: var(--space-2); }

  .site-header.nav-open .main-nav {
    display: block;
    position: absolute;
    top: 100%; left: 0; right: 0;
    background: var(--paper);
    border-bottom: 1px solid var(--paper-line);
    box-shadow: 0 12px 24px rgba(36,26,18,0.08);
  }
  .site-header.nav-open .main-nav ul { flex-direction: column; gap: 0; padding: var(--space-2) var(--space-3); }
  .site-header.nav-open .main-nav a { display: block; padding: 0.8rem 0; border-bottom: 1px solid var(--paper-line); }
  .site-header.nav-open .main-nav a::after { display: none; }

  .about-grid { grid-template-columns: 1fr; }
  .about-figure { order: -1; }
  .seal-figure { width: 140px; }

  .capability-grid { grid-template-columns: repeat(2, 1fr); }
  .sector-list { grid-template-columns: repeat(2, 1fr); }
  .approach-grid { grid-template-columns: 1fr; gap: var(--space-3); }
  .footer-inner { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 620px) {
  .container { padding: 0 var(--space-2); }
  .hero { min-height: 70vh; padding: var(--space-5) 0 var(--space-4); }
  .hero-links { gap: var(--space-2) var(--space-3); flex-direction: column; align-items: flex-start; }
  .capability-grid { grid-template-columns: 1fr; }
  .sector-list { grid-template-columns: 1fr 1fr; }
  .section { padding: var(--space-5) 0; }
  .brand-en { display: none; }
  .footer-inner { grid-template-columns: 1fr; }
}