/* ==========================================================================
   KN BUILT — Design tokens
   Palette:
     --navy-deep    #0A2647  (headers, footer, dark sections)
     --blue-primary #1B5FA8  (brand blue, buttons, links)
     --blue-bright  #2E86DE  (hover / highlight accent)
     --steel-gray   #5C6B73  (secondary text, borders)
     --amber        #F5A623  (signature accent — safety / measuring-tool nod)
     --paper        #F5F7F9  (light background)
     --ink          #16232E  (body text)
   Type:
     Display — 'Kanit'        (headlines, industrial geometric Thai sans)
     Body    — 'Sarabun'      (paragraphs, UI text)
     Utility — 'IBM Plex Mono'(spec labels, eyebrows, numbers)
   ========================================================================== */

:root {
  --navy-deep: #0A2647;
  --navy-mid: #123A6B;
  --blue-primary: #1B5FA8;
  --blue-bright: #2E86DE;
  --steel-gray: #5C6B73;
  --amber: #F5A623;
  --amber-dark: #D98C0F;
  --paper: #F5F7F9;
  --paper-dim: #E9EEF2;
  --ink: #16232E;
  --white: #FFFFFF;

  --font-display: 'Kanit', sans-serif;
  --font-body: 'Sarabun', sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;

  --radius: 4px;
  --container: 1160px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; scroll-behavior: auto !important; }
}

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

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.25;
  margin: 0 0 0.5em;
  color: var(--navy-deep);
}

h1 { font-size: clamp(2.1rem, 4.5vw, 3.4rem); font-weight: 800; }
h2 { font-size: clamp(1.6rem, 3vw, 2.3rem); }
h3 { font-size: 1.25rem; }

p { margin: 0 0 1em; color: var(--ink); }

a { color: var(--blue-primary); text-decoration: none; }
a:hover { color: var(--blue-bright); }

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

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

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--amber-dark);
  font-weight: 600;
}

/* Focus visibility */
a:focus-visible, button:focus-visible, .btn:focus-visible {
  outline: 3px solid var(--amber);
  outline-offset: 2px;
}

/* ==========================================================================
   Blueprint grid texture — signature background used behind dark sections
   ========================================================================== */
.blueprint-bg {
  background-color: var(--navy-deep);
  background-image:
    linear-gradient(rgba(255,255,255,0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.045) 1px, transparent 1px);
  background-size: 36px 36px;
}

.blueprint-bg-light {
  background-color: var(--paper);
  background-image:
    linear-gradient(rgba(10,38,71,0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(10,38,71,0.05) 1px, transparent 1px);
  background-size: 32px 32px;
}

/* ==========================================================================
   Signature element — corner bracket frame (carpenter's-square marks)
   Applied around photos and cards to nod to measuring tools / framing squares
   ========================================================================== */
.bracket-frame {
  position: relative;
  padding: 10px;
}
.bracket-frame::before,
.bracket-frame::after,
.bracket-frame .bracket-frame-inner::before,
.bracket-frame .bracket-frame-inner::after {
  content: "";
  position: absolute;
  width: 26px;
  height: 26px;
  border: 3px solid var(--amber);
  z-index: 2;
}
.bracket-frame::before { top: 0; left: 0; border-right: none; border-bottom: none; }
.bracket-frame::after { top: 0; right: 0; border-left: none; border-bottom: none; }
.bracket-frame .bracket-frame-inner { position: absolute; inset: 10px; pointer-events: none; }
.bracket-frame .bracket-frame-inner::before { bottom: 0; left: 0; border-right: none; border-top: none; }
.bracket-frame .bracket-frame-inner::after { bottom: 0; right: 0; border-left: none; border-top: none; }
.bracket-frame img { width: 100%; height: 100%; object-fit: cover; }

/* ==========================================================================
   Header / Nav
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--navy-deep);
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 24px;
  max-width: var(--container);
  margin: 0 auto;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.3rem;
  color: var(--white);
  letter-spacing: 0.02em;
}
.logo-mark {
  width: 38px;
  height: 38px;
  border: 2.5px solid var(--amber);
  border-radius: 3px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--amber);
  transform: rotate(-3deg);
  flex-shrink: 0;
}
.logo small {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  font-weight: 400;
  letter-spacing: 0.15em;
  color: var(--amber);
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav-links a {
  color: rgba(255,255,255,0.85);
  font-weight: 600;
  font-size: 0.96rem;
  position: relative;
  padding: 6px 2px;
}
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0; right: 100%;
  bottom: 0;
  height: 2px;
  background: var(--amber);
  transition: right 0.2s ease;
}
.nav-links a:hover { color: var(--white); }
.nav-links a:hover::after { right: 0; }
.nav-links a.current { color: var(--amber); }

.nav-cta {
  background: var(--amber);
  color: var(--navy-deep) !important;
  padding: 9px 18px;
  border-radius: var(--radius);
  font-weight: 700 !important;
  font-size: 0.9rem !important;
}
.nav-cta::after { display: none; }
.nav-cta:hover { background: var(--white); color: var(--navy-deep) !important; }

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid rgba(255,255,255,0.3);
  border-radius: 3px;
  padding: 8px 10px;
  cursor: pointer;
}
.nav-toggle span, .nav-toggle span::before, .nav-toggle span::after {
  content: "";
  display: block;
  width: 20px;
  height: 2px;
  background: var(--white);
  position: relative;
  transition: 0.2s;
}
.nav-toggle span::before { position: absolute; top: -6px; }
.nav-toggle span::after { position: absolute; top: 6px; }

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 26px;
  border-radius: var(--radius);
  font-weight: 700;
  font-family: var(--font-body);
  font-size: 0.98rem;
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, background 0.15s ease, color 0.15s ease;
}
.btn-primary { background: var(--amber); color: var(--navy-deep); }
.btn-primary:hover { background: var(--amber-dark); color: var(--navy-deep); transform: translateY(-2px); }
.btn-outline { border-color: rgba(255,255,255,0.5); color: var(--white); }
.btn-outline:hover { border-color: var(--amber); color: var(--amber); transform: translateY(-2px); }
.btn-outline-navy { border-color: var(--navy-deep); color: var(--navy-deep); }
.btn-outline-navy:hover { background: var(--navy-deep); color: var(--white); }

/* ==========================================================================
   Hero
   ========================================================================== */
.hero {
  position: relative;
  color: var(--white);
  overflow: hidden;
  background: var(--navy-deep);
}
.hero-media {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.hero-media img {
  width: 100%; height: 100%; object-fit: cover;
  opacity: 0.55;
}
.hero-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(100deg, rgba(10,38,71,0.97) 20%, rgba(10,38,71,0.75) 55%, rgba(10,38,71,0.4) 100%);
}
.hero-inner {
  position: relative;
  z-index: 1;
  padding: 110px 24px 90px;
  max-width: var(--container);
  margin: 0 auto;
}
.hero-inner .eyebrow { color: var(--amber); }
.hero-inner h1 { color: var(--white); max-width: 720px; }
.hero-inner p.lead {
  max-width: 560px;
  font-size: 1.1rem;
  color: rgba(255,255,255,0.85);
}
.hero-cta-row { display: flex; gap: 16px; flex-wrap: wrap; margin-top: 30px; }

.hero-specs {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid rgba(255,255,255,0.15);
  max-width: var(--container);
  margin: 0 auto;
}
.hero-specs div {
  padding: 22px 24px;
  border-right: 1px solid rgba(255,255,255,0.15);
}
.hero-specs div:last-child { border-right: none; }
.hero-specs .spec-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--amber);
  display: block;
  margin-bottom: 6px;
}
.hero-specs .spec-value { font-family: var(--font-display); font-weight: 700; font-size: 1.05rem; color: var(--white); }

/* ==========================================================================
   Sections
   ========================================================================== */
section { padding: 88px 0; }
.section-head {
  max-width: 640px;
  margin: 0 0 48px;
}
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }

.section-dark { background: var(--navy-deep); color: rgba(255,255,255,0.85); }
.section-dark h2 { color: var(--white); }
.section-dark p { color: rgba(255,255,255,0.75); }

/* Category / service cards */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; }

.card {
  background: var(--white);
  border: 1px solid var(--paper-dim);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.card:hover { transform: translateY(-4px); box-shadow: 0 16px 30px -14px rgba(10,38,71,0.25); }
.card-media { aspect-ratio: 4/3; overflow: hidden; background: var(--paper-dim); }
.card-media img { width: 100%; height: 100%; object-fit: cover; }
.card-body { padding: 22px 24px 26px; }
.card-body .eyebrow { display: block; margin-bottom: 8px; }
.card-body p { color: var(--steel-gray); font-size: 0.96rem; margin-bottom: 0; }

/* checklist style list */
.check-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 14px; }
.check-list li {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  font-size: 1rem;
}
.check-list li::before {
  content: "";
  flex-shrink: 0;
  width: 20px; height: 20px;
  margin-top: 3px;
  border: 2px solid var(--amber);
  transform: rotate(45deg);
}

/* Split layout (image + text) */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}
.split-media { aspect-ratio: 4/3; }
.split-media img { width: 100%; height: 100%; object-fit: cover; }

/* Stats strip */
.stats-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  padding: 44px 0;
}
.stat { text-align: center; }
.stat .num { font-family: var(--font-display); font-weight: 800; font-size: 2.4rem; color: var(--amber); }
.stat .label { font-family: var(--font-mono); font-size: 0.78rem; letter-spacing: 0.06em; text-transform: uppercase; color: rgba(255,255,255,0.7); }

/* Values / timeline (about page) */
.value-row {
  display: grid;
  grid-template-columns: 90px 1fr;
  gap: 20px;
  padding: 26px 0;
  border-bottom: 1px solid var(--paper-dim);
}
.value-row:last-child { border-bottom: none; }
.value-row .value-code { font-family: var(--font-mono); color: var(--blue-primary); font-weight: 700; font-size: 1rem; }

/* Contact page */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 40px;
}
.contact-card {
  background: var(--white);
  border: 1px solid var(--paper-dim);
  border-radius: var(--radius);
  padding: 32px;
}
.contact-item {
  display: flex;
  gap: 16px;
  padding: 18px 0;
  border-bottom: 1px solid var(--paper-dim);
}
.contact-item:last-child { border-bottom: none; }
.contact-item .icon {
  width: 42px; height: 42px;
  border-radius: 3px;
  background: var(--paper);
  border: 1.5px solid var(--amber);
  color: var(--navy-deep);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  font-family: var(--font-mono);
  font-weight: 700;
}
.contact-item h3 { margin-bottom: 4px; font-size: 1.02rem; }
.contact-item p { color: var(--steel-gray); margin-bottom: 0; font-size: 0.95rem; }
.map-frame { border: 0; width: 100%; height: 100%; min-height: 420px; border-radius: var(--radius); }

/* CTA banner */
.cta-banner {
  background: var(--blue-primary);
  color: var(--white);
  border-radius: var(--radius);
  padding: 52px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}
.cta-banner h2 { color: var(--white); margin-bottom: 8px; }
.cta-banner p { color: rgba(255,255,255,0.85); margin-bottom: 0; }

/* Footer */
.site-footer {
  background: var(--navy-deep);
  color: rgba(255,255,255,0.75);
  padding: 64px 0 28px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,0.12);
}
.footer-grid h4 { color: var(--white); font-size: 0.95rem; letter-spacing: 0.04em; margin-bottom: 18px; font-family: var(--font-mono); text-transform: uppercase; }
.footer-grid p, .footer-grid a { color: rgba(255,255,255,0.68); font-size: 0.94rem; }
.footer-grid ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.footer-grid a:hover { color: var(--amber); }
.footer-bottom {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  padding-top: 24px;
  font-size: 0.85rem;
  color: rgba(255,255,255,0.5);
}
.footer-bottom a { color: rgba(255,255,255,0.5); }

/* Privacy policy page */
.policy-split { grid-template-columns: 260px 1fr; align-items: start; gap: 48px; }
@media (max-width: 880px) { .policy-split { grid-template-columns: 1fr; } }

.policy-content h2 { margin-top: 2em; font-size: 1.35rem; }
.policy-content h2:first-child { margin-top: 0; }
.policy-content ul { padding-right: 0; padding-left: 20px; }
.policy-content li { margin-bottom: 8px; }
.policy-meta {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--steel-gray);
  border-left: 3px solid var(--amber);
  padding-left: 14px;
}

/* Reveal-on-scroll (subtle, respects reduced motion) */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.is-visible { opacity: 1; transform: translateY(0); }

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 880px) {
  .grid-3, .grid-2, .split, .contact-grid { grid-template-columns: 1fr; }
  .split { gap: 32px; }
  .split-media { order: -1; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .hero-specs { grid-template-columns: 1fr; }
  .hero-specs div { border-right: none; border-bottom: 1px solid rgba(255,255,255,0.15); }
  .hero-specs div:last-child { border-bottom: none; }
  .stats-strip { grid-template-columns: repeat(2, 1fr); }
  .value-row { grid-template-columns: 1fr; gap: 6px; }
  .cta-banner { padding: 36px; flex-direction: column; text-align: center; }
}

@media (max-width: 720px) {
  .nav-links {
    position: fixed;
    top: 66px; left: 0; right: 0;
    background: var(--navy-deep);
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 8px 24px 20px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
    transform: translateY(-130%);
    transition: transform 0.25s ease;
  }
  .nav-links.open { transform: translateY(0); }
  .nav-links li { width: 100%; padding: 10px 0; border-bottom: 1px solid rgba(255,255,255,0.06); }
  .nav-links a { display: block; }
  .nav-toggle { display: block; }
  .nav-cta { display: inline-block; margin-top: 10px; }
}