/* ──────────────────────────────────────────────────────────────
   K P LitWitChai Engineering — landing styles
   ────────────────────────────────────────────────────────────── */
:root {
  --bg: oklch(0.985 0.004 80);
  --surface: oklch(0.96 0.006 80);
  --ink: oklch(0.18 0.01 250);
  --mute: oklch(0.55 0.01 250);
  --accent: oklch(0.55 0.13 245);
  --accent-ink: oklch(0.98 0.01 245);
  --warm: oklch(0.72 0.10 55);
  --line: oklch(0.88 0.008 80);
  --radius: 14px;
  --pad-x: clamp(20px, 5vw, 88px);
  --section-y: clamp(72px, 9vw, 128px);

  --font-sans: "Sora", "IBM Plex Sans Thai", system-ui, sans-serif;
  --font-thai: "IBM Plex Sans Thai", "Sora", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;
}
html[data-density="compact"] {
  --section-y: clamp(48px, 6vw, 88px);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-feature-settings: "ss01", "ss02";
  line-height: 1.5;
}
:lang(th), .hero-th, .about-th, .contact-th, .service-th, .stat-th {
  font-family: var(--font-thai);
}
a { color: inherit; text-decoration: none; }
em { font-style: italic; color: var(--accent); font-weight: 500; }
strong { font-weight: 600; }

.page { overflow: hidden; }

/* ─────────────────────────  Nav  ─────────────────────────── */
.nav {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between;
  gap: 32px;
  padding: 16px var(--pad-x);
  background: color-mix(in oklab, var(--bg) 85%, transparent);
  backdrop-filter: blur(14px) saturate(1.3);
  border-bottom: 1px solid transparent;
  transition: border-color .25s ease, padding .2s ease;
}
.nav--scrolled {
  border-bottom-color: var(--line);
  padding-top: 12px; padding-bottom: 12px;
}
.logo {
  display: flex; align-items: baseline; gap: 4px;
  font-weight: 700; letter-spacing: -0.01em;
  font-size: 18px;
}
.logo-k, .logo-p {
  display: inline-grid; place-items: center;
  width: 28px; height: 28px; border-radius: 7px;
  background: var(--ink); color: var(--bg);
  font-family: var(--font-sans);
  font-size: 14px; font-weight: 700;
  align-self: center;
}
.logo-p { background: var(--accent); color: var(--accent-ink); }
.logo-dot {
  width: 4px; height: 4px; border-radius: 50%;
  background: var(--warm);
  margin: 0 2px 4px;
  align-self: center;
}
.logo-text {
  margin-left: 8px; font-size: 15px; font-weight: 600;
  display: inline-flex; gap: 6px; align-items: baseline;
}
.logo-text em {
  font-style: normal; color: var(--mute);
  font-weight: 400; font-size: 13px;
}
.logo-mark { gap: 10px; }
.logo-mark svg { align-self: center; }

.nav-links {
  display: flex; gap: 28px;
  font-size: 14px; color: var(--mute);
}
.nav-links a {
  position: relative; padding: 4px 0;
  transition: color .15s ease;
}
.nav-links a:hover { color: var(--ink); }
.nav-links a::after {
  content: ""; position: absolute; left: 0; bottom: -2px;
  width: 0; height: 1px; background: var(--accent);
  transition: width .2s ease;
}
.nav-links a:hover::after { width: 100%; }

/* ─────────────────────────  Buttons  ────────────────────────── */
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 10px 18px; border-radius: 999px;
  font: 600 14px/1 var(--font-sans);
  border: 1px solid transparent;
  cursor: pointer; transition: all .18s ease;
  white-space: nowrap;
}
.btn-lg { padding: 16px 24px; font-size: 15px; gap: 12px; border-radius: 14px; }
.btn-full { width: 100%; justify-content: center; }
.btn-primary {
  background: var(--ink); color: var(--bg);
}
.btn-primary:hover { background: var(--accent); color: var(--accent-ink); transform: translateY(-1px); }
.btn-ghost {
  border-color: var(--line); color: var(--ink);
  background: transparent;
}
.btn-ghost:hover { border-color: var(--ink); }
.btn-dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--warm);
  box-shadow: 0 0 0 4px color-mix(in oklab, var(--warm) 30%, transparent);
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 0 color-mix(in oklab, var(--warm) 40%, transparent); }
  50%      { box-shadow: 0 0 0 6px color-mix(in oklab, var(--warm) 0%, transparent); }
}
.btn-num {
  font-family: var(--font-mono); font-size: 12px;
  color: color-mix(in oklab, currentColor 65%, transparent);
  padding-left: 8px; margin-left: 2px;
  border-left: 1px solid color-mix(in oklab, currentColor 25%, transparent);
}

/* ─────────────────────────  Hero  ────────────────────────── */
.hero {
  padding: clamp(48px, 6vw, 96px) var(--pad-x) var(--section-y);
}
.hero-split {
  display: grid; grid-template-columns: minmax(0,1.05fr) minmax(0,1fr);
  gap: clamp(40px, 5vw, 80px); align-items: center;
}
@media (max-width: 920px) {
  .hero-split { grid-template-columns: 1fr; }
}

.eyebrow {
  display: inline-flex; align-items: center; gap: 12px;
  font-family: var(--font-mono); font-size: 12px;
  color: var(--mute); margin-bottom: 28px;
}
.eyebrow-tag {
  padding: 4px 10px; border: 1px solid var(--line); border-radius: 999px;
  color: var(--ink); font-weight: 600; letter-spacing: 0.04em;
}
.eyebrow-center { justify-content: center; margin-inline: auto; }

.display {
  font-size: clamp(48px, 7.4vw, 104px);
  line-height: 0.96; letter-spacing: -0.035em;
  font-weight: 600;
  margin: 0 0 28px;
  text-wrap: balance;
}
.display em {
  font-style: italic;
  background: linear-gradient(105deg, var(--accent), var(--warm));
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
  font-weight: 600;
}
.display-xl { font-size: clamp(56px, 8.5vw, 124px); }
.display-ed { font-size: clamp(72px, 11vw, 168px); letter-spacing: -0.045em; }

.hero-lede {
  font-size: clamp(16px, 1.3vw, 19px);
  color: var(--mute);
  max-width: 52ch;
  margin: 0 0 36px;
  text-wrap: pretty;
}
.hero-th {
  font-size: clamp(16px, 1.25vw, 19px);
  color: var(--ink);
  margin: -16px 0 24px;
  font-weight: 500;
}
.hero-lede-center, .hero-th-center {
  max-width: 56ch; margin-left: auto; margin-right: auto;
  text-align: center;
}
.hero-ctas { display: flex; gap: 12px; flex-wrap: wrap; }
.hero-ctas-center { justify-content: center; }

.hero-foot {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-top: 56px;
  padding-top: 32px;
  border-top: 1px solid var(--line);
  max-width: 540px;
}
.hero-foot-cell strong {
  display: block; font-size: 28px; font-weight: 600;
  letter-spacing: -0.02em; margin-bottom: 4px;
}
.hero-foot-cell span {
  font-size: 13px; color: var(--mute); line-height: 1.4;
}

/* Centered hero */
.hero-centered {
  text-align: center;
  display: flex; flex-direction: column; align-items: center;
}
.hero-art-wide { width: 100%; max-width: 920px; margin-top: 56px; }

/* Editorial hero */
.hero-editorial { display: flex; flex-direction: column; }
.hero-ed-top {
  display: flex; justify-content: space-between;
  border-top: 1px solid var(--ink); border-bottom: 1px solid var(--ink);
  padding: 12px 0; margin-bottom: 32px;
  font-family: var(--font-mono); font-size: 12px;
  letter-spacing: 0.05em; text-transform: uppercase;
}
.hero-ed-grid {
  display: grid; grid-template-columns: 1.4fr 1fr;
  gap: 56px; margin-top: 32px; align-items: end;
}
@media (max-width: 780px) {
  .hero-ed-grid { grid-template-columns: 1fr; }
}
.hero-ed-cta { display: flex; flex-direction: column; gap: 12px; }

/* Diagram */
.hero-art { display: flex; justify-content: center; }
.diagram {
  width: 100%; max-width: 560px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 18px;
  box-shadow:
    0 1px 0 color-mix(in oklab, var(--ink) 4%, transparent),
    0 30px 50px -30px color-mix(in oklab, var(--ink) 22%, transparent);
}
.diagram-wide { max-width: 100%; }
.diagram svg { width: 100%; height: auto; display: block; }

/* ─────────────────────────  Ticker  ────────────────────────── */
.ticker {
  border-block: 1px solid var(--line);
  background: var(--surface);
  overflow: hidden;
  padding: 18px 0;
}
.ticker-track {
  display: flex; gap: 0;
  animation: marquee 32s linear infinite;
  width: max-content;
}
.ticker-row {
  display: flex; align-items: center; gap: 28px;
  padding-right: 28px;
  font-family: var(--font-mono); font-size: 13px;
  color: var(--mute);
  text-transform: uppercase; letter-spacing: 0.08em;
  white-space: nowrap;
}
.ticker-row .dot { color: var(--accent); font-size: 8px; }
@keyframes marquee {
  from { transform: translateX(0); }
  to   { transform: translateX(-50%); }
}

/* ─────────────────────────  Section head  ───────────────────── */
.section-head {
  max-width: 720px;
  padding: var(--section-y) var(--pad-x) 48px;
}
.section-eyebrow {
  font-family: var(--font-mono); font-size: 12px;
  color: var(--accent); margin-bottom: 16px;
  letter-spacing: 0.06em;
}
.section-title {
  font-size: clamp(34px, 4.6vw, 64px);
  line-height: 1.02; letter-spacing: -0.03em;
  font-weight: 600; margin: 0 0 20px;
  text-wrap: balance;
}
.section-sub {
  font-size: clamp(15px, 1.2vw, 18px);
  color: var(--mute); margin: 0;
  max-width: 56ch; text-wrap: pretty;
}

/* ─────────────────────────  Partners  ────────────────────────── */
.partners { padding-bottom: var(--section-y); }
.partner-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1px;
  background: var(--line);
  border-block: 1px solid var(--line);
  padding: 0 var(--pad-x);
  margin: 0 calc(var(--pad-x) * -1) 64px;
  padding-left: var(--pad-x); padding-right: var(--pad-x);
}
@media (max-width: 920px) {
  .partner-grid { grid-template-columns: repeat(2, 1fr); }
}
.partner-card {
  background: var(--bg);
  padding: 36px 24px 28px;
  display: flex; flex-direction: column; gap: 6px;
  transition: background .2s ease;
  position: relative;
}
.partner-card:hover { background: var(--surface); }
.partner-card::before {
  content: ""; position: absolute; top: 16px; right: 16px;
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent);
}
.partner-name {
  font-family: var(--font-sans);
  font-size: clamp(22px, 2.2vw, 32px);
  font-weight: 700; letter-spacing: 0.04em;
  color: var(--ink);
}
.partner-tag {
  font-family: var(--font-mono); font-size: 12px;
  color: var(--mute); text-transform: uppercase;
  letter-spacing: 0.08em;
}
.partner-cert {
  margin-top: 14px; padding-top: 14px;
  border-top: 1px dashed var(--line);
  font-size: 12px; color: var(--mute);
}

.quote-row {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 24px; padding: 0 var(--pad-x);
}
@media (max-width: 780px) { .quote-row { grid-template-columns: 1fr; } }
.quote {
  margin: 0; padding: 32px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}
.quote blockquote {
  margin: 0 0 12px; font-size: clamp(18px, 1.6vw, 24px);
  line-height: 1.35; font-weight: 500;
  letter-spacing: -0.01em;
}
.quote figcaption {
  font-family: var(--font-mono); font-size: 12px;
  color: var(--mute); letter-spacing: 0.04em;
}

/* ─────────────────────────  About  ────────────────────────── */
.about { padding-bottom: var(--section-y); }
.about-grid {
  display: grid; grid-template-columns: 1.3fr 1fr;
  gap: clamp(40px, 5vw, 88px);
  padding: 0 var(--pad-x);
  align-items: start;
}
@media (max-width: 920px) { .about-grid { grid-template-columns: 1fr; } }

.about-th {
  font-size: 17px; color: var(--ink);
  font-weight: 500; margin: 0 0 20px;
}
.about-body {
  font-size: 17px; color: var(--mute);
  line-height: 1.65; text-wrap: pretty;
  margin: 0 0 28px;
}
.about-body strong { color: var(--ink); }
.about-list {
  list-style: none; padding: 0; margin: 0;
  display: grid; gap: 12px;
}
.about-list li {
  display: flex; align-items: center; gap: 12px;
  font-size: 15px;
}
.about-list svg { color: var(--accent); flex-shrink: 0; }

.about-stats {
  display: grid; grid-template-columns: 1fr 1fr; gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}
.stat {
  background: var(--surface);
  padding: 28px 24px;
}
.stat-n {
  font-size: clamp(36px, 4vw, 56px);
  font-weight: 600; letter-spacing: -0.03em;
  line-height: 1; margin-bottom: 10px;
  color: var(--ink);
}
.stat:nth-child(odd) .stat-n { color: var(--accent); }
.stat-label { font-size: 13px; color: var(--ink); font-weight: 500; }
.stat-th { font-size: 12px; color: var(--mute); margin-top: 2px; }

/* ─────────────────────────  Services  ────────────────────────── */
.services { padding-bottom: var(--section-y); background: var(--surface); }
.service-grid {
  display: grid; grid-template-columns: repeat(2, 1fr);
  gap: 1px; background: var(--line);
  border-block: 1px solid var(--line);
}
@media (max-width: 780px) { .service-grid { grid-template-columns: 1fr; } }
.service-card {
  background: var(--bg);
  padding: 36px clamp(24px, 3vw, 40px);
  display: flex; flex-direction: column; gap: 16px;
  transition: background .2s ease;
}
.service-card:hover { background: var(--surface); }
.service-card header {
  display: flex; flex-direction: column; gap: 6px;
  margin-bottom: 4px;
}
.service-code {
  font-family: var(--font-mono); font-size: 11px;
  color: var(--accent); letter-spacing: 0.1em;
}
.service-card h3 {
  margin: 0; font-size: 24px; font-weight: 600;
  letter-spacing: -0.015em;
}
.service-th { font-size: 13px; color: var(--mute); }
.service-card p {
  margin: 0; color: var(--mute);
  font-size: 15px; line-height: 1.55; text-wrap: pretty;
}
.service-card ul {
  list-style: none; padding: 0; margin: 0;
  display: grid; gap: 8px;
  font-size: 14px;
}
.service-card li {
  display: flex; align-items: center; gap: 10px;
}
.bullet {
  width: 5px; height: 5px; border-radius: 50%;
  background: var(--accent);
}

/* ─────────────────────────  Contact  ────────────────────────── */
.contact {
  padding: var(--section-y) var(--pad-x);
}
.contact-grid {
  display: grid; grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: clamp(32px, 4vw, 64px);
}
@media (max-width: 920px) { .contact-grid { grid-template-columns: 1fr; } }

.contact-th {
  font-size: 17px; margin: 0 0 24px; color: var(--ink); font-weight: 500;
}
.contact-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px;
  background: var(--surface);
  display: grid; gap: 18px;
}
.contact-row {
  display: grid; grid-template-columns: 80px 1fr;
  gap: 16px; align-items: baseline;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
}
.contact-row:nth-last-child(2) { border-bottom: none; padding-bottom: 0; }
.contact-key {
  font-family: var(--font-mono); font-size: 12px;
  color: var(--mute); text-transform: uppercase;
  letter-spacing: 0.06em;
}
.contact-val {
  font-size: 15px; color: var(--ink); line-height: 1.45;
}
.contact-phone {
  font-size: 22px; font-weight: 600; letter-spacing: -0.01em;
  color: var(--ink);
}
.contact-phone:hover { color: var(--accent); }
.btn-call { margin-top: 6px; }

.map-wrap {
  display: flex; flex-direction: column; gap: 16px;
}
.map-frame {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--surface);
  aspect-ratio: 4 / 3;
  box-shadow: 0 20px 40px -28px color-mix(in oklab, var(--ink) 30%, transparent);
}
.map-frame iframe {
  width: 100%; height: 100%; border: 0; display: block;
  filter: saturate(0.85) contrast(1.02);
}
.map-meta {
  display: flex; justify-content: space-between; align-items: center;
  padding: 0 4px; flex-wrap: wrap; gap: 12px;
}
.map-key {
  font-family: var(--font-mono); font-size: 11px;
  color: var(--mute); text-transform: uppercase;
  letter-spacing: 0.06em; margin-bottom: 2px;
}
.map-val { font-family: var(--font-mono); font-size: 14px; }

/* ─────────────────────────  Footer  ────────────────────────── */
.foot {
  border-top: 1px solid var(--line);
  padding: 48px var(--pad-x) 32px;
  background: var(--surface);
}
.foot-top {
  display: flex; justify-content: space-between; align-items: center;
  flex-wrap: wrap; gap: 16px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--line);
}
.foot-tag {
  font-family: var(--font-mono); font-size: 12px;
  color: var(--mute); letter-spacing: 0.04em;
}
.foot-bot {
  display: flex; justify-content: space-between; align-items: center;
  padding-top: 24px; flex-wrap: wrap; gap: 16px;
  font-size: 13px; color: var(--mute);
}
.foot-links { display: flex; gap: 24px; }
.foot-links a:hover { color: var(--ink); }

/* ─────────────────────────  Floating call  ───────────────────── */
.fab {
  position: fixed; right: 20px; bottom: 20px; z-index: 60;
  display: flex; align-items: center; gap: 10px;
  padding: 14px 20px; border-radius: 999px;
  background: var(--accent); color: var(--accent-ink);
  font-weight: 600; font-size: 14px;
  box-shadow: 0 14px 28px -10px color-mix(in oklab, var(--accent) 60%, transparent);
  opacity: 0; transform: translateY(20px) scale(0.9);
  transition: all .25s cubic-bezier(.2,.8,.2,1);
  pointer-events: none;
}
.fab--in { opacity: 1; transform: translateY(0) scale(1); pointer-events: auto; }
.fab:hover { transform: translateY(-2px) scale(1.03); }

/* Responsive nav */
@media (max-width: 720px) {
  .nav-links { display: none; }
  .nav-cta .btn-num { display: none; }
  .hero-foot { grid-template-columns: 1fr; }
}