/* =========================================================
   Intro (index.html): rain behind wet glass, liquid title, Enter
   Builds on the tokens in style.css.
   ========================================================= */

.splash {
  --intro-ink: #1F6FB0;
  --intro-band: rgba(8, 40, 52, 0.62);   /* dark band so white text reads on white clouds */
  --intro-text: #EAF6F8;
  --intro-muted: rgba(234, 246, 248, 0.86);

  min-height: 100vh;
  min-height: 100svh;
  overflow: hidden;
  background: var(--intro-ink);
  color: var(--intro-text);
}

/* ---------- Background ---------- */

.intro__bg {
  position: fixed;
  inset: 0;
  overflow: hidden;
  background: var(--intro-ink) url("../assets/img/sky-blue-poster.jpg") center / cover no-repeat;
}

/* The video stays in view (browsers pause muted video that leaves the viewport);
   the WebGL canvas covers it and draws the blurred and refracted versions. */
.intro__video {
  position: absolute;
  inset: -4%;
  width: 108%;
  height: 108%;
  object-fit: cover;
  filter: blur(6px) saturate(1.05);
}

.intro__glass {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  transition: opacity 900ms var(--ease);
}
.splash.gl-ready .intro__glass { opacity: 1; }

/* ---------- Stage ---------- */

.intro__stage {
  position: relative;
  z-index: 2;
  display: grid;
  justify-items: center;
  align-content: center;
  gap: var(--s-6);
  min-height: 100vh;
  min-height: 100svh;
  padding: var(--s-16) var(--gutter) 9rem;
  text-align: center;
  perspective: 900px;
}

.intro__title {
  width: min(94vw, 1120px);
  margin: 0;
  transform-origin: 50% 55%;
  will-change: transform;
}

.title-slot {
  display: block;
  width: 100%;
  aspect-ratio: 1000 / 260;
}
/* WebGL draws the glass title into the slot; the SVG only shows without WebGL */
.splash.gl-ready .title-slot svg { visibility: hidden; }

.liquid {
  display: block;
  width: 100%;
  height: auto;
  overflow: visible;
}
.liquid text {
  font-family: var(--font-display);
  font-size: 196px;
  font-weight: 700;
  letter-spacing: -5px;
}

.intro__tag {
  margin-top: calc(var(--s-4) * -1);
  padding: var(--s-1) var(--s-4);
  border-radius: var(--r-md);
  background: var(--intro-band);
  font-family: var(--font-display);
  font-size: var(--fs-18);
  font-weight: 500;
  letter-spacing: 0.01em;
  color: var(--intro-text);
}
:lang(th) .intro__tag { font-family: var(--font-body); letter-spacing: 0; }

/* ---------- Enter ---------- */

.enter {
  display: inline-flex;
  align-items: center;
  gap: var(--s-6);
  min-height: 3.5rem;
  margin-top: var(--s-4);
  padding: var(--s-2) var(--s-6) var(--s-2) var(--s-8);
  border: 1px solid rgba(234, 246, 248, 0.6);
  border-radius: var(--r-md);
  background: var(--intro-band);
  color: var(--intro-text);
  font-family: var(--font-display);
  font-size: var(--fs-18);
  font-weight: 600;
  letter-spacing: 0.02em;
  text-decoration: none;
  transition:
    background-color var(--dur-fast) var(--ease),
    border-color var(--dur-fast) var(--ease),
    color var(--dur-fast) var(--ease);
}
:lang(th) .enter { font-family: var(--font-body); letter-spacing: 0; }
.enter svg { width: 20px; height: 20px; }
.enter:hover {
  background: var(--intro-text);
  border-color: var(--intro-text);
  color: var(--c-ink-900);
}
.enter:focus-visible {
  outline: 2px solid var(--c-aqua-200);
  outline-offset: 4px;
  border-radius: var(--r-md);
}

/* ---------- Top bar ---------- */

.intro__top {
  position: fixed;
  top: 0;
  right: 0;
  z-index: 3;
  padding: var(--s-4) var(--gutter);
}

/* ---------- Footer ---------- */

.intro__footer {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 2;
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--s-2) var(--s-8);
  padding: var(--s-3) var(--gutter);
  font-size: var(--fs-12);
  line-height: 1.6;
  color: var(--intro-muted);
  background: var(--intro-band);
}
.intro__footer ul {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-1) var(--s-6);
  margin: 0;
  padding: 0;
  list-style: none;
}
.intro__footer a {
  color: var(--intro-text);
  text-decoration: underline;
  text-decoration-color: rgba(234, 246, 248, 0.35);
  text-underline-offset: 3px;
  transition: text-decoration-color var(--dur-fast) var(--ease);
}
.intro__footer a:hover { text-decoration-color: currentColor; }
.intro__footer a:focus-visible { outline-color: var(--c-aqua-200); }

.intro__footer p { max-width: 42rem; }
.intro__credit { white-space: nowrap; }

/* ---------- Warp into the site ---------- */

[data-fade] { transition: opacity 360ms var(--ease); }
.is-warping [data-fade] { opacity: 0; pointer-events: none; }

.is-warping .intro__title {
  transform: translate3d(0, -2%, 620px);
  opacity: 0;
  transition:
    transform 1500ms cubic-bezier(0.55, 0, 0.8, 0.2),
    opacity 700ms cubic-bezier(0.55, 0, 1, 0.45) 650ms;
}

/* Without WebGL the blurred video is the background on its own */
.splash.no-gl .intro__glass { display: none; }

/* ---------- Small screens ---------- */

@media (max-width: 640px) {
  .intro__stage { gap: var(--s-4); padding-bottom: 12rem; }
  .intro__tag { margin-top: 0; font-size: var(--fs-16); }
  .enter { gap: var(--s-4); padding-left: var(--s-6); }
  .intro__footer { justify-content: flex-start; }
}

@media (prefers-reduced-motion: reduce) {
  .is-warping .intro__title { transform: none; }
}