@import url("https://fonts.googleapis.com/css2?family=Inter:wght@400;600;700;800&family=Noto+Sans+JP:wght@400;500;700;800&family=Noto+Sans+Thai:wght@400;500;700;800&display=swap");

:root {
  --ink: #15202b;
  --muted: #5b6778;
  --line: #d7dee8;
  --paper: #ffffff;
  --soft: #f3f7fb;
  --deep: #172436;
  --teal: #0d8a86;
  --blue: #2454a6;
  --gold: #c99417;
  --gold-light: #ffd86b;
  --gold-deep: #7c4d00;
  --font-base: "Inter", "Noto Sans", Arial, Helvetica, sans-serif;
  --font-thai: "Noto Sans Thai", "Tahoma", "Arial", sans-serif;
  --font-japanese: "Noto Sans JP", "Yu Gothic", "Meiryo", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--font-base);
  line-height: 1.55;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

html[lang="th"] body {
  font-family: var(--font-thai);
  line-height: 1.7;
}

html[lang="ja"] body {
  font-family: var(--font-japanese);
  line-height: 1.68;
}

a {
  color: inherit;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: auto minmax(320px, 1fr) auto;
  align-items: center;
  gap: 22px;
  padding: 12px clamp(18px, 4vw, 56px);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(247, 250, 253, 0.94)),
    linear-gradient(90deg, rgba(201, 148, 23, 0.13), transparent 34%, rgba(13, 138, 134, 0.08));
  border-bottom: 1px solid rgba(201, 148, 23, 0.28);
  box-shadow: 0 12px 30px rgba(21, 32, 43, 0.08);
  backdrop-filter: blur(14px);
}

.topbar::after {
  content: "";
  position: absolute;
  left: clamp(18px, 4vw, 56px);
  right: clamp(18px, 4vw, 56px);
  bottom: -1px;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(90deg, transparent, rgba(201, 148, 23, 0.72), transparent);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-size: 24px;
  font-weight: 700;
  letter-spacing: 0;
  text-decoration: none;
  white-space: nowrap;
  position: relative;
  z-index: 1;
}

.brand img {
  width: 72px;
  height: 72px;
  object-fit: contain;
}

nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px;
  color: #516071;
  font-size: 14px;
  font-weight: 600;
  position: relative;
  z-index: 1;
}

nav a {
  min-height: 34px;
  padding: 7px 12px;
  border: 1px solid rgba(201, 148, 23, 0.24);
  border-radius: 7px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.92), rgba(255, 249, 229, 0.88));
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.88);
  text-decoration: none;
  transition: background 160ms ease, border-color 160ms ease, color 160ms ease, box-shadow 160ms ease;
}

nav a:hover,
nav a:focus-visible {
  color: #1d1300;
  border-color: rgba(201, 148, 23, 0.72);
  background: linear-gradient(180deg, #ffe8a3, #f5bd38);
  box-shadow: 0 8px 18px rgba(201, 148, 23, 0.22);
}

.language-switcher {
  position: relative;
  z-index: 1;
  display: inline-flex;
  gap: 4px;
  padding: 4px;
  border: 1px solid rgba(201, 148, 23, 0.22);
  border-radius: 8px;
  background: rgba(243, 247, 251, 0.92);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.8), 0 8px 18px rgba(21, 32, 43, 0.06);
}

.language-switcher button {
  min-width: 38px;
  min-height: 32px;
  border: 0;
  border-radius: 6px;
  color: var(--muted);
  background: transparent;
  font-weight: 700;
  font-family: var(--font-base);
  cursor: pointer;
}

.language-switcher button.active {
  color: white;
  background: linear-gradient(180deg, #223247, #142033);
  box-shadow: 0 4px 10px rgba(21, 32, 43, 0.18);
}

.hero {
  display: flex;
  align-items: center;
  min-height: 470px;
  padding: clamp(42px, 6vw, 72px) clamp(20px, 5vw, 56px);
  color: white;
  background:
    linear-gradient(90deg, rgba(12, 7, 0, 0.9) 0%, rgba(26, 17, 5, 0.72) 42%, rgba(55, 35, 3, 0.34) 100%),
    url("assets/hero/gold-circuit-board.png") center / cover no-repeat;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hero::before {
  background: linear-gradient(180deg, rgba(255, 218, 104, 0.12), rgba(0, 0, 0, 0.18));
}

.hero-copy {
  position: relative;
  z-index: 2;
  max-width: 840px;
}

.circuit-flow {
  position: absolute;
  inset: 0;
  z-index: 1;
  width: 100%;
  height: 100%;
  opacity: 0.78;
  mix-blend-mode: screen;
  pointer-events: none;
}

.circuit-flow path {
  fill: none;
  stroke: rgba(255, 224, 126, 0.82);
  stroke-width: 3;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-dasharray: 34 220;
  stroke-dashoffset: 0;
  filter: drop-shadow(0 0 8px rgba(255, 200, 70, 0.78));
  animation: circuitPulse 4.8s linear infinite;
}

.circuit-flow path:nth-of-type(2),
.circuit-flow path:nth-of-type(5) {
  animation-duration: 6.2s;
  animation-delay: -1.6s;
}

.circuit-flow path:nth-of-type(3),
.circuit-flow path:nth-of-type(6) {
  animation-duration: 5.4s;
  animation-delay: -3s;
}

.circuit-flow circle {
  fill: rgba(255, 230, 150, 0.82);
  filter: drop-shadow(0 0 10px rgba(255, 203, 74, 0.95));
  animation: nodeGlow 2.8s ease-in-out infinite;
}

.circuit-flow circle:nth-of-type(2n) {
  animation-delay: -1.2s;
}

.circuit-flow circle:nth-of-type(3n) {
  animation-delay: -2s;
}

@keyframes circuitPulse {
  to {
    stroke-dashoffset: -254;
  }
}

@keyframes nodeGlow {
  0%,
  100% {
    opacity: 0.28;
    transform: scale(0.85);
  }

  45% {
    opacity: 1;
    transform: scale(1.12);
  }
}

@media (prefers-reduced-motion: reduce) {
  .circuit-flow path,
  .circuit-flow circle {
    animation: none;
  }
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--gold);
  font-size: clamp(11px, 0.9vw, 12px);
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: 0;
  text-transform: uppercase;
}

html[lang="th"] .eyebrow,
html[lang="ja"] .eyebrow {
  font-size: clamp(12px, 1vw, 13px);
  line-height: 1.45;
  text-transform: none;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 760px;
  margin-bottom: 18px;
  font-size: clamp(34px, 4.4vw, 54px);
  line-height: 1.08;
  font-weight: 800;
  letter-spacing: 0;
}

html[lang="th"] h1,
html[lang="ja"] h1 {
  max-width: 800px;
  font-size: clamp(31px, 4vw, 48px);
  line-height: 1.2;
}

h2 {
  margin-bottom: 14px;
  font-size: clamp(27px, 3.4vw, 40px);
  line-height: 1.14;
  font-weight: 800;
  letter-spacing: 0;
}

html[lang="th"] h2,
html[lang="ja"] h2 {
  font-size: clamp(25px, 3.1vw, 36px);
  line-height: 1.28;
}

h3 {
  margin-bottom: 10px;
  font-size: 20px;
  line-height: 1.2;
  font-weight: 700;
}

html[lang="th"] h3,
html[lang="ja"] h3 {
  line-height: 1.35;
}

.lead {
  max-width: 680px;
  color: rgba(255, 255, 255, 0.86);
  font-size: clamp(16px, 1.45vw, 18px);
  font-weight: 400;
}

html[lang="th"] .lead,
html[lang="ja"] .lead {
  max-width: 720px;
  font-size: clamp(15px, 1.35vw, 17px);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 46px;
  padding: 12px 18px;
  border: 1px solid rgba(255, 255, 255, 0.55);
  border-radius: 6px;
  font-weight: 700;
  line-height: 1.2;
  text-decoration: none;
}

.button.primary {
  color: #1d1300;
  border-color: rgba(255, 231, 150, 0.96);
  background: linear-gradient(180deg, #ffe38a, #f0a90f);
  box-shadow: 0 12px 30px rgba(240, 169, 15, 0.28);
}

.button.secondary {
  color: white;
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.5);
}

.download-button::before {
  content: "↓";
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  color: #1d1300;
  background: rgba(255, 255, 255, 0.5);
  font-size: 18px;
  font-weight: 800;
  line-height: 1;
}

.button-kicker {
  padding-right: 10px;
  border-right: 1px solid rgba(29, 19, 0, 0.28);
  text-transform: uppercase;
  font-size: 12px;
  letter-spacing: 0;
}

.section {
  padding: clamp(30px, 4.4vw, 48px) clamp(20px, 5vw, 56px);
}

.section-heading {
  max-width: 720px;
  margin-bottom: 20px;
}

.two-column,
.compact-copy {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 32px;
  color: var(--muted);
  font-size: 18px;
}

.compact-copy {
  grid-template-columns: minmax(0, 760px);
}

html[lang="th"] .two-column,
html[lang="ja"] .two-column {
  font-size: 17px;
}

.band {
  background: var(--soft);
}

.facts,
.service-grid,
.gallery {
  display: grid;
  gap: 14px;
}

.facts {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin-top: 20px;
  max-width: 1120px;
}

.facts div,
.service-grid article {
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: white;
}

.facts div {
  border-top: 3px solid var(--gold);
}

.facts dd,
.service-grid p,
.contact p,
dd,
figcaption {
  color: var(--muted);
}

.facts dt,
.service-grid h3 {
  margin-bottom: 6px;
}

.facts dd,
.service-grid p {
  line-height: 1.48;
}

html[lang="th"] .facts dd,
html[lang="th"] .service-grid p,
html[lang="ja"] .facts dd,
html[lang="ja"] .service-grid p {
  line-height: 1.62;
}

.service-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  max-width: 1280px;
}

.gallery {
  max-width: 1280px;
}

.service-grid article {
  min-height: 148px;
}

.gallery {
  grid-template-columns: repeat(5, minmax(0, 1fr));
}

figure {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: white;
}

figure img {
  display: block;
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

figcaption {
  min-height: 58px;
  padding: 11px 13px;
  font-size: 14px;
  line-height: 1.45;
}

.references {
  margin-top: 14px;
  padding: 14px 16px;
  border-left: 4px solid var(--teal);
  background: var(--soft);
  color: var(--muted);
}

.research-strip {
  display: grid;
  grid-template-columns: minmax(260px, 0.9fr) repeat(2, minmax(220px, 1fr));
  align-items: center;
  gap: 14px;
  margin: 0 clamp(20px, 5vw, 56px);
  padding: 18px;
  border: 1px solid rgba(201, 148, 23, 0.45);
  border-left: 5px solid var(--gold);
  border-radius: 8px;
  background: linear-gradient(180deg, #ffffff, #f7f9fc);
  box-shadow: 0 14px 36px rgba(21, 32, 43, 0.08);
}

.research-strip span {
  color: var(--ink);
  font-weight: 800;
}

.research-strip p {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.download-link {
  display: grid;
  gap: 5px;
  min-height: 72px;
  padding: 13px 14px;
  border: 1px solid rgba(201, 148, 23, 0.36);
  border-radius: 8px;
  color: var(--ink);
  background: #fffdf7;
  text-decoration: none;
}

.download-link span {
  color: var(--gold-deep);
  font-size: 12px;
  text-transform: uppercase;
}

.download-link strong {
  color: var(--blue);
  line-height: 1.35;
}

.contact {
  display: grid;
  grid-template-columns: minmax(320px, 0.9fr) minmax(420px, 1.1fr);
  gap: clamp(28px, 7vw, 86px);
  align-items: start;
  color: white;
  background: var(--deep);
}

.contact p,
.contact dd {
  color: rgba(255, 255, 255, 0.78);
}

.contact-intro {
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr);
  gap: 18px 22px;
  max-width: 740px;
}

.contact-intro img {
  width: 92px;
  height: 92px;
  object-fit: contain;
  filter: drop-shadow(0 18px 26px rgba(0, 0, 0, 0.25));
}

.contact-intro p:not(.eyebrow) {
  grid-column: 1 / -1;
  max-width: 720px;
}

.contact-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 30px;
}

dl {
  margin: 0;
}

.contact-list div + div {
  margin-top: 0;
}

dt {
  font-weight: 700;
}

dd {
  margin: 3px 0 0;
}

footer {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 18px clamp(20px, 5vw, 56px);
  color: var(--muted);
  border-top: 1px solid var(--line);
  font-size: 14px;
}

@media (max-width: 1100px) {
  .topbar {
    grid-template-columns: 1fr auto;
  }

  nav {
    grid-column: 1 / -1;
    justify-content: flex-start;
  }

  .service-grid,
  .gallery {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 820px) {
  .two-column,
  .compact-copy,
  .contact {
    grid-template-columns: 1fr;
  }

  .contact-list {
    grid-template-columns: 1fr;
  }

  .facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .research-strip {
    grid-template-columns: 1fr;
  }

  footer {
    flex-direction: column;
  }
}

@media (max-width: 560px) {
  .topbar {
    grid-template-columns: 1fr;
  }

  .brand {
    font-size: 20px;
    white-space: normal;
  }

  .brand img {
    width: 56px;
    height: 56px;
  }

  .hero {
    min-height: auto;
  }

  h1 {
    font-size: 38px;
  }

  .service-grid,
  .gallery,
  .facts {
    grid-template-columns: 1fr;
  }
}