/* ==========================================================================
   Ceylon AAC — stylesheet
   Design tokens grounded in the product: poured-concrete grey surfaces,
   a cinnabar-red accent (nod to the Tang Dynasty name), jade for the
   sustainability content, and a cellular "trapped air" bubble motif used
   as the recurring signature graphic (AAC is ~80% air by volume).
   ========================================================================== */

/* Optional local webfonts — populate assets/fonts/ via scripts/download-assets.sh
   and these upgrade automatically. Until then the system stack below is used. */
@font-face {
  font-family: 'Archivo';
  src: url('../fonts/archivo-800.woff2') format('woff2');
  font-weight: 800;
  font-display: swap;
}
@font-face {
  font-family: 'Archivo';
  src: url('../fonts/archivo-600.woff2') format('woff2');
  font-weight: 600;
  font-display: swap;
}
@font-face {
  font-family: 'IBM Plex Sans';
  src: url('../fonts/plex-sans-400.woff2') format('woff2');
  font-weight: 400;
  font-display: swap;
}
@font-face {
  font-family: 'IBM Plex Sans';
  src: url('../fonts/plex-sans-500.woff2') format('woff2');
  font-weight: 500;
  font-display: swap;
}
@font-face {
  font-family: 'IBM Plex Mono';
  src: url('../fonts/plex-mono-500.woff2') format('woff2');
  font-weight: 500;
  font-display: swap;
}

:root {
  /* Palette */
  --concrete-50:  #ECEAE4;
  --concrete-100: #F7F6F3;
  --concrete-200: #DEDBD3;
  --concrete-ink: #1E1C1A;
  --steel-600:    #4A5560;
  --steel-700:    #333B42;
  --cinnabar:     #B5391F;
  --cinnabar-dark:#8E2C17;
  --jade:         #3F5A4E;
  --jade-light:   #E4EBE7;
  --white:        #FFFFFF;

  /* Type */
  --font-display: 'Archivo', 'Arial Black', 'Helvetica Neue', Arial, sans-serif;
  --font-body: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, 'SFMono-Regular', Menlo, monospace;

  /* Layout */
  --container: 1180px;
  --container-wide: 1600px;
  --radius: 6px;
  --shadow-sm: 0 1px 3px rgba(30,28,26,0.08);
  --shadow-md: 0 8px 24px rgba(30,28,26,0.10);
  --header-h: 96px;
  --topbar-h: 38px;
}

/* --- Reset --- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--concrete-ink);
  background: var(--concrete-100);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; margin: 0; padding: 0; }
h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 800; line-height: 1.15; margin: 0 0 .5em; letter-spacing: -0.01em; }
p { margin: 0 0 1em; }
.skip-link { position: absolute; left: -999px; top: 0; background: var(--cinnabar); color: #fff; padding: .75rem 1.25rem; z-index: 999; }
.skip-link:focus { left: 0; }

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; scroll-behavior: auto !important; }
}

.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }
section { position: relative; }

/* --- Buttons --- */
.btn {
  display: inline-flex; align-items: center; gap: .5rem;
  font-family: var(--font-body); font-weight: 600; font-size: .95rem;
  padding: .85rem 1.6rem; border-radius: var(--radius);
  border: 1.5px solid transparent; cursor: pointer;
  transition: transform .15s ease, background .2s ease, color .2s ease, border-color .2s ease;
}
.btn-primary { background: var(--cinnabar); color: #fff; }
.btn-primary:hover { background: var(--cinnabar-dark); transform: translateY(-1px); }
.btn-outline { border-color: currentColor; background: transparent; }
.btn-outline:hover { background: var(--concrete-ink); color: #fff; border-color: var(--concrete-ink); }
.btn-light { background: #fff; color: var(--concrete-ink); }
.btn-light:hover { background: var(--concrete-50); transform: translateY(-1px); }

/* --- Top utility bar --- */
.topbar { background: var(--concrete-ink); color: var(--concrete-50); font-size: .82rem; height: var(--topbar-h); }
.topbar-inner { max-width: var(--container-wide); margin: 0 auto; padding: 0 24px; height: 100%; display: flex; align-items: center; justify-content: space-between; }
.topbar-hotline a { color: #fff; font-weight: 600; }
.topbar-hotline a:hover { color: var(--cinnabar); }
.topbar-label { color: #9A958D; margin-right: .5em; text-transform: uppercase; letter-spacing: .06em; font-size: .72rem; }
.topbar-divider { margin: 0 .4em; color: #5B564E; }
.topbar-whatsapp { display: inline-flex; align-items: center; gap: .4em; color: #fff; font-weight: 600; }
.topbar-whatsapp:hover { color: #4CBB63; }

/* --- Header / Nav --- */
.site-header { background: #fff; box-shadow: var(--shadow-sm); position: sticky; top: 0; z-index: 100; }
.site-header-inner { max-width: var(--container-wide); margin: 0 auto; padding: 14px 24px; min-height: var(--header-h); display: flex; flex-wrap: wrap; align-items: center; row-gap: 10px; gap: 1.5rem; }
.brand { display: flex; align-items: center; gap: 1.75rem; flex-shrink: 0; }
.brand-logo-icon { height: 50px; width: auto; display: block; }
.brand-name-text { font-family: var(--font-body); font-weight: 600; font-size: .95rem; line-height: 1.3; color: var(--concrete-ink); white-space: nowrap; }

.site-nav { display: flex; align-items: center; gap: 2rem; margin-left: auto; }
.site-nav ul { display: flex; gap: 1.75rem; }
.site-nav a:not(.btn) { font-weight: 600; font-size: .95rem; color: var(--steel-700); padding: .5rem 0; position: relative; }
.site-nav a:not(.btn)::after { content: ''; position: absolute; left: 0; right: 0; bottom: 0; height: 2px; background: var(--cinnabar); transform: scaleX(0); transition: transform .2s ease; }
.site-nav a:not(.btn):hover, .site-nav a.is-active { color: var(--concrete-ink); }
.site-nav a:not(.btn):hover::after, .site-nav a.is-active::after { transform: scaleX(1); }
.nav-cta { white-space: nowrap; }

.nav-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: 0; cursor: pointer; padding: 8px; }
.nav-toggle span { width: 24px; height: 2px; background: var(--concrete-ink); transition: all .2s ease; }

/* --- Hero (home) — contained split layout, built for a labelled diagram
   rather than a full-bleed photo --- */
.hero { padding: 56px 0 72px; background: var(--concrete-50); overflow: hidden; }
.hero-inner { position: relative; z-index: 1; display: grid; grid-template-columns: 1.05fr 1fr; gap: 3rem; align-items: center; }
.eyebrow { font-family: var(--font-mono); font-size: .8rem; letter-spacing: .12em; text-transform: uppercase; color: var(--cinnabar); margin-bottom: .9rem; }
.hero-copy h1 { font-size: clamp(2.1rem, 4vw, 3.15rem); margin-bottom: .6rem; }
.hero-lead { font-size: 1.1rem; color: var(--steel-600); max-width: 460px; margin-bottom: 1.85rem; }
.hero-media { position: relative; }
.hero-media img {
  width: 100%; height: auto; border-radius: 10px;
  background: #fff; box-shadow: var(--shadow-md);
  border: 1px solid var(--concrete-200);
}

/* --- Fixed page banner (all inner pages) --- */
.page-banner { background: var(--concrete-ink); color: #fff; padding: 68px 0 52px; overflow: hidden; }
.page-banner-pattern {
  position: absolute; inset: 0;
  background-image: radial-gradient(circle, rgba(255,255,255,.07) 2.5px, transparent 2.5px);
  background-size: 26px 26px;
  mask-image: linear-gradient(120deg, #000 10%, transparent 75%);
}
.page-banner-inner { position: relative; max-width: var(--container); margin: 0 auto; padding: 0 24px; }
.breadcrumb { font-family: var(--font-mono); font-size: .8rem; color: #B8B2A8; margin-bottom: .9rem; }
.breadcrumb a { color: #E8A48F; }
.page-banner h1 { color: #fff; font-size: clamp(1.9rem, 3.6vw, 2.75rem); margin-bottom: .3rem; }
.page-banner-sub { color: #C9C4BA; max-width: 560px; margin: 0; }

/* --- Cellular / aerated bubble motif (signature) --- */
.cell-motif {
  position: absolute; inset: 0; z-index: 0; pointer-events: none;
  background-image:
    radial-gradient(circle, rgba(181,57,31,.05) 8px, transparent 8px),
    radial-gradient(circle, rgba(63,90,78,.05) 5px, transparent 5px);
  background-size: 64px 64px, 38px 38px;
  background-position: 0 0, 20px 30px;
}
.cell-divider { height: 64px; position: relative; overflow: hidden; }
.cell-divider::before {
  content: ''; position: absolute; inset: 0;
  background-image: radial-gradient(circle, var(--concrete-200) 3px, transparent 3px);
  background-size: 22px 22px;
  opacity: .6;
}

/* --- Section scaffolding --- */
.section { padding: 84px 0; }
.section-tight { padding: 56px 0; }
.section-dark { background: var(--concrete-ink); color: #fff; }
.section-dark h2, .section-dark h3 { color: #fff; }
.section-tint { background: var(--concrete-50); }
.section-jade { background: var(--jade-light); }

.section-head { max-width: 640px; margin-bottom: 3rem; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.kicker { display: inline-flex; align-items: center; gap: .5em; font-family: var(--font-mono); font-size: .78rem; letter-spacing: .1em; text-transform: uppercase; color: var(--cinnabar); margin-bottom: .9rem; }
.kicker::before { content: ''; width: 24px; height: 2px; background: var(--cinnabar); display: inline-block; }
.section-head h2 { font-size: clamp(1.7rem, 3vw, 2.35rem); }
.section-head p { color: var(--steel-600); font-size: 1.05rem; }
.section-dark .section-head p { color: #C9C4BA; }

/* --- Two column layout --- */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 3.5rem; align-items: center; }
.split-top { align-items: start; }
.split img { border-radius: var(--radius); box-shadow: var(--shadow-md); }
.split-reverse .split-media { order: 2; }

/* --- Cards / grids --- */
.grid { display: grid; gap: 1.75rem; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-5 { grid-template-columns: repeat(5, 1fr); }

.card { background: #fff; border-radius: var(--radius); padding: 2rem 1.75rem; box-shadow: var(--shadow-sm); border: 1px solid var(--concrete-200); transition: transform .2s ease, box-shadow .2s ease; }
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.card h3 { font-size: 1.1rem; margin-bottom: .5rem; }
.card p { color: var(--steel-600); font-size: .95rem; margin-bottom: 0; }
.card-icon { width: 46px; height: 46px; margin-bottom: 1.1rem; color: var(--cinnabar); }

.icon-tile { text-align: center; padding: 1.6rem 1rem; }
.icon-tile .card-icon { margin-left: auto; margin-right: auto; }
.icon-tile h3 { font-size: .98rem; }

/* --- Stat strip --- */
.stat-strip { background: var(--jade); color: #fff; padding: 48px 0; }
.stat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; text-align: center; }
.stat-num { font-family: var(--font-display); font-weight: 800; font-size: clamp(1.9rem, 3.2vw, 2.6rem); display: block; }
.stat-label { font-size: .85rem; color: #CFE0D6; text-transform: uppercase; letter-spacing: .05em; }

/* --- Values / feature list (alternating) --- */
.feature-row { display: grid; grid-template-columns: 44px 1fr; gap: 1.25rem; padding: 1.6rem 0; border-top: 1px solid var(--concrete-200); }
.feature-row:first-of-type { border-top: none; }
.feature-row .feature-num { font-family: var(--font-mono); color: var(--cinnabar); font-weight: 600; }
.feature-row h3 { font-size: 1.05rem; margin-bottom: .35rem; }
.feature-row p { color: var(--steel-600); margin: 0; }

/* --- Quote / callout --- */
.blockquote { border-left: 3px solid var(--cinnabar); padding-left: 1.5rem; font-family: var(--font-display); font-weight: 600; font-size: 1.25rem; color: var(--concrete-ink); margin: 0; }

/* --- Company panel image pair (available for future use — not currently
   referenced; kept for portrait photo pairs, e.g. if better client photos
   arrive later) --- */
.panel-pair { display: grid; grid-template-columns: 1.1fr .9fr; gap: 0; border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-md); }
.panel-pair img { height: 100%; object-fit: cover; }

/* --- CTA band --- */
.cta-band { background: var(--concrete-ink); color: #fff; padding: 64px 0; text-align: center; position: relative; overflow: hidden; }
.cta-band h2 { color: #fff; margin-bottom: .5rem; }
.cta-band p { color: #C9C4BA; margin-bottom: 1.75rem; }
.cta-actions { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }

/* --- Gallery (factory) --- */
.gallery-figure { border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-md); margin-bottom: 1.5rem; }
.gallery-figure img { width: 100%; }
.gallery-figure figcaption { background: #fff; padding: 1rem 1.25rem; font-size: .9rem; color: var(--steel-600); border: 1px solid var(--concrete-200); border-top: 0; }
.figure-stack { display: flex; flex-direction: column; gap: 1.5rem; }
.figure-stack .gallery-figure { margin: 0; }

/* --- Contact page --- */
.contact-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.75rem; margin-bottom: 3rem; }
.contact-card { background: #fff; border-radius: var(--radius); padding: 2rem; border: 1px solid var(--concrete-200); }
.contact-card .card-icon { color: var(--cinnabar); margin-bottom: 1rem; }
.contact-card h3 { font-size: 1rem; text-transform: uppercase; letter-spacing: .04em; color: var(--steel-600); margin-bottom: .6rem; }
.contact-card a, .contact-card p { font-size: 1.05rem; font-weight: 600; color: var(--concrete-ink); margin: 0; }
.map-embed { border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-md); border: 0; width: 100%; height: 380px; }

/* --- Floating action buttons --- */
.floating-actions { position: fixed; right: 20px; bottom: 24px; z-index: 200; display: flex; flex-direction: column; gap: 12px; }
.fab { width: 54px; height: 54px; border-radius: 50%; display: flex; align-items: center; justify-content: center; box-shadow: var(--shadow-md); position: relative; transition: transform .2s ease; }
.fab:hover { transform: scale(1.08); }
.fab-whatsapp { background: #25D366; color: #fff; }
.fab-call { background: var(--cinnabar); color: #fff; animation: pulse 2.4s ease-in-out infinite; }
.fab-tooltip { position: absolute; right: 64px; top: 50%; transform: translateY(-50%); background: var(--concrete-ink); color: #fff; font-size: .8rem; padding: .4rem .75rem; border-radius: 4px; white-space: nowrap; opacity: 0; pointer-events: none; transition: opacity .2s ease; }
.fab:hover .fab-tooltip { opacity: 1; }
@keyframes pulse { 0%, 100% { box-shadow: 0 0 0 0 rgba(181,57,31,.45), var(--shadow-md); } 50% { box-shadow: 0 0 0 8px rgba(181,57,31,0), var(--shadow-md); } }

/* --- Footer --- */
.site-footer { background: var(--concrete-ink); color: #C9C4BA; }
.site-footer-top { max-width: var(--container); margin: 0 auto; padding: 64px 24px 40px; display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 2.5rem; }
.footer-col h4 { color: #fff; font-size: .95rem; text-transform: uppercase; letter-spacing: .05em; margin-bottom: 1.1rem; }
.footer-col ul li { margin-bottom: .6rem; font-size: .92rem; }
.footer-col a:hover { color: var(--cinnabar); }
.footer-logos { display: flex; gap: .6rem; margin-bottom: 1.1rem; flex-wrap: wrap; }
.footer-logos img { background: #fff; padding: 8px 10px; border-radius: 6px; display: block; }
.footer-legal-name { color: #fff; font-weight: 600; font-size: .95rem; max-width: 280px; margin-bottom: 1.1rem; }
.footer-social { display: inline-flex; align-items: center; justify-content: center; width: 36px; height: 36px; border-radius: 50%; background: rgba(255,255,255,.08); }
.footer-social:hover { background: var(--cinnabar); }
.footer-contact li { color: #C9C4BA; }
.site-footer-bottom { border-top: 1px solid rgba(255,255,255,.1); padding: 1.4rem 24px; max-width: var(--container); margin: 0 auto; display: flex; justify-content: space-between; flex-wrap: wrap; gap: .5rem; font-size: .8rem; color: #8A8479; }
.site-footer-bottom a { color: #C9C4BA; font-weight: 600; }
.site-footer-bottom a:hover { color: var(--cinnabar); }

/* --- Scroll reveal (light touch, respects reduced motion) --- */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .6s ease, transform .6s ease; }
.reveal.is-visible { opacity: 1; transform: none; }

/* --- 404 / 403 --- */
.error-page { min-height: 60vh; display: flex; align-items: center; }
.error-code { font-family: var(--font-display); font-size: clamp(4rem, 12vw, 8rem); color: var(--concrete-200); line-height: 1; }

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-5 { grid-template-columns: repeat(3, 1fr); }
  .site-footer-top { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 1180px) {
  .brand-logo-icon { height: 42px; }
  .brand-name-text { font-size: .85rem; }
  .site-nav ul { gap: 1.15rem; }
  .site-nav { gap: 1.25rem; }
}

@media (max-width: 860px) {
  .topbar-label { display: none; }
  .nav-toggle { display: flex; }
  .brand-logo-icon { height: 38px; }
  .brand-name-text { font-size: .8rem; }
  .hero-inner { grid-template-columns: 1fr; gap: 2.5rem; text-align: center; }
  .hero-copy { display: flex; flex-direction: column; align-items: center; }
  .hero-media { order: -1; }
  .site-nav {
    position: fixed; top: calc(var(--topbar-h) + var(--header-h)); left: 0; right: 0; bottom: 0;
    background: #fff; flex-direction: column; align-items: flex-start; padding: 2rem 24px;
    transform: translateX(100%); transition: transform .25s ease; overflow-y: auto;
  }
  .site-nav.is-open { transform: translateX(0); }
  .site-nav ul { flex-direction: column; gap: 0; width: 100%; }
  .site-nav ul li { width: 100%; border-bottom: 1px solid var(--concrete-200); }
  .site-nav ul li a { display: block; padding: 1rem 0; }
  .nav-cta { margin-top: 1.5rem; }

  .split, .panel-pair { grid-template-columns: 1fr; }
  .split-reverse .split-media { order: 0; }
  .grid-3, .grid-4, .grid-5 { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; }
  .stat-grid { grid-template-columns: repeat(2, 1fr); gap: 2rem 1rem; }
  .site-footer-top { grid-template-columns: 1fr; padding: 48px 24px 32px; }
  .section { padding: 60px 0; }
}

@media (max-width: 540px) {
  .grid-3, .grid-4, .grid-5 { grid-template-columns: 1fr 1fr; }
  .site-footer-bottom { flex-direction: column; text-align: center; }
}

@media (max-width: 400px) {
  .brand-logo-icon { height: 34px; }
  .brand-name-text, .brand-logo-secondary { display: none; }
}