:root {
  --ink: #0b1c2c;
  --ink-soft: #2a4054;
  --mist: #e8f2f6;
  --paper: #f4f8fa;
  --brand: #0e7c9b;
  --brand-deep: #0a4f6e;
  --accent: #1ab8c4;
  --line: rgba(14, 124, 155, 0.18);
  --font: "Instrument Sans", "Noto Sans Thai", "Noto Sans SC", system-ui, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.55;
}

img, video { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

.top {
  position: fixed;
  inset: 0 0 auto;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.65rem clamp(1rem, 4vw, 2.5rem);
  background: rgba(244, 248, 250, 0.86);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.brand-mark img {
  height: clamp(56px, 8vw, 78px);
  width: auto;
  max-width: min(280px, 48vw);
  object-fit: contain;
}
.top-right {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}
.top nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem 1.25rem;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--ink-soft);
}
.top nav a:hover { color: var(--brand-deep); }
.lang {
  display: inline-flex;
  border: 1px solid var(--line);
  border-radius: 999px;
  overflow: hidden;
  background: #fff;
}
.lang-btn {
  appearance: none;
  border: 0;
  background: transparent;
  padding: 0.35rem 0.7rem;
  font: inherit;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
  cursor: pointer;
}
.lang-btn.is-active {
  background: var(--brand-deep);
  color: #fff;
}
.lang-btn:not(.is-active):hover { color: var(--brand-deep); }

html[data-lang="th"] body {
  font-family: "Noto Sans Thai", "Instrument Sans", system-ui, sans-serif;
}
html[data-lang="zh"] body {
  font-family: "Noto Sans SC", "Instrument Sans", system-ui, sans-serif;
}

.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100dvh;
  display: grid;
  align-items: end;
  overflow: hidden;
}
.hero-media {
  position: absolute;
  inset: 0;
}
.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 30%;
  transform: scale(1.04);
  animation: heroDrift 18s ease-in-out infinite alternate;
}
.hero-veil {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(100deg, rgba(8, 24, 38, 0.88) 8%, rgba(8, 24, 38, 0.35) 55%, rgba(8, 24, 38, 0.2) 100%),
    linear-gradient(to top, rgba(8, 24, 38, 0.75), transparent 42%);
}
.hero-copy {
  position: relative;
  z-index: 2;
  padding: clamp(6rem, 14vh, 9rem) clamp(1.25rem, 5vw, 4rem) clamp(3rem, 8vh, 5rem);
  max-width: 42rem;
  color: #f5fafc;
  animation: riseIn 1s ease both;
}
.brand-name {
  margin: 0 0 0.85rem;
  font-size: clamp(1.35rem, 3.2vw, 2rem);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: #9fe8ef;
}
.hero h1 {
  margin: 0 0 1rem;
  font-size: clamp(2.1rem, 5.5vw, 3.6rem);
  line-height: 1.12;
  font-weight: 700;
  letter-spacing: -0.02em;
}
.lead {
  margin: 0 0 1.75rem;
  font-size: clamp(1rem, 2vw, 1.15rem);
  color: rgba(245, 250, 252, 0.88);
  max-width: 34rem;
}
.cta-row { display: flex; flex-wrap: wrap; gap: 0.75rem; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 1.35rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform 0.2s ease, background 0.2s ease, color 0.2s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn.primary { background: var(--accent); color: #052530; }
.btn.ghost {
  border: 1px solid rgba(255,255,255,0.45);
  color: #fff;
}
.btn.ghost:hover { background: rgba(255,255,255,0.1); }

.band {
  padding: clamp(3.5rem, 9vh, 6rem) clamp(1.25rem, 5vw, 4rem);
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.band.in { opacity: 1; transform: none; }
.eyebrow {
  margin: 0 0 0.5rem;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--brand);
}
.band h2 {
  margin: 0 0 0.85rem;
  font-size: clamp(1.7rem, 3.5vw, 2.45rem);
  line-height: 1.2;
  letter-spacing: -0.02em;
}
.section-lead {
  margin: 0 0 2rem;
  max-width: 40rem;
  color: var(--ink-soft);
  font-size: 1.05rem;
}

.about {
  background:
    radial-gradient(ellipse at top right, rgba(26, 184, 196, 0.12), transparent 50%),
    linear-gradient(180deg, #f7fbfd, #eef5f8);
}
.hubs {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}
.hubs li {
  padding: 0;
  border-top: 2px solid var(--brand);
  padding-top: 1.1rem;
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s ease 0.1s, transform 0.6s ease 0.1s;
}
.hubs li.in { opacity: 1; transform: none; }
.hub-city {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 0.35rem;
}
.hubs strong {
  display: block;
  font-size: 1.15rem;
  margin-bottom: 0.4rem;
}
.hubs p { margin: 0; color: var(--ink-soft); font-size: 0.95rem; }

.product {
  background: var(--ink);
  color: #eef7fa;
}
.product .eyebrow { color: var(--accent); }
.product .section-lead { color: rgba(238, 247, 250, 0.78); }
.specs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem 1.5rem;
  margin: 0 0 2rem;
}
.specs div {
  border-left: 2px solid rgba(26, 184, 196, 0.55);
  padding-left: 0.9rem;
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}
.specs div.in { opacity: 1; transform: none; }
.specs dt {
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: rgba(238, 247, 250, 0.55);
  margin-bottom: 0.25rem;
}
.specs dd {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 600;
}
.pillars {
  margin: 0;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--accent);
}

.edu {
  background:
    linear-gradient(135deg, #dff3f6 0%, #f4f8fa 45%, #e8f4e9 100%);
}
.edu-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.75rem 2rem;
}
.edu-grid article {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}
.edu-grid article.in { opacity: 1; transform: none; }
.edu-grid h3 {
  margin: 0 0 0.45rem;
  font-size: 1.15rem;
  color: var(--brand-deep);
}
.edu-grid p { margin: 0; color: var(--ink-soft); }

.scenes {
  background: #fff;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.scene-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1rem;
  max-width: 42rem;
}
.scene-list li {
  padding: 1rem 0;
  border-bottom: 1px solid var(--line);
  color: var(--ink-soft);
}
.scene-list strong { color: var(--ink); }

.demo { background: var(--mist); }
.videos {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}
.videos figure { margin: 0; }
.videos video {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  background: #0b1c2c;
}
.videos figcaption {
  margin-top: 0.5rem;
  font-size: 0.9rem;
  color: var(--ink-soft);
}

.contact {
  background:
    radial-gradient(circle at 20% 20%, rgba(26,184,196,0.15), transparent 40%),
    linear-gradient(180deg, #f4f8fa, #e7f1f5);
}
.contact-lines {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.65rem;
  font-size: 1.05rem;
  color: var(--ink-soft);
}

footer {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  padding: 1.5rem clamp(1.25rem, 5vw, 4rem) 2.5rem;
  border-top: 1px solid var(--line);
  background: #fff;
  color: var(--ink-soft);
  font-size: 0.9rem;
}
.foot-logo {
  height: clamp(48px, 7vw, 68px);
  width: auto;
  max-width: 240px;
  object-fit: contain;
}

@keyframes heroDrift {
  from { transform: scale(1.04) translate3d(0, 0, 0); }
  to { transform: scale(1.08) translate3d(-1.5%, -1%, 0); }
}
@keyframes riseIn {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: none; }
}

@media (max-width: 860px) {
  .hubs, .specs, .edu-grid, .videos { grid-template-columns: 1fr; }
  .top nav { display: none; }
}