/* The simulation stays inside the welcome panel. */
.fluid-tank {
  position: relative;
  isolation: isolate;
  width: min(1440px, 100%);
  height: clamp(360px, 33vw, 500px);
  margin: 36px auto 64px;
  box-sizing: border-box;
  overflow: hidden;
  border: 1px solid rgba(205, 235, 240, .28);
  border-radius: 24px;
  background: radial-gradient(ellipse at 20% 65%, #122b32 0, transparent 65%), linear-gradient(130deg, #101a20, #0b1117 65%, #151922);
  box-shadow: inset 0 1px 0 #ffffff26, inset 0 0 40px #84dfff06, 0 24px 70px #0005;
}
.fluid-tank::after {
  content: ''; position: absolute; inset: 7px; border-radius: 18px;
  border: 1px solid #b3eaf512; pointer-events: none; z-index: 4;
  background: linear-gradient(115deg, #ffffff05, transparent 26%, transparent 80%, #ffffff03);
}
.tank-fluid, .tank-lettering { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }
.tank-fluid { z-index: 1; cursor: crosshair; touch-action: pan-y; }
.fluid-tank[data-touch="ink"] .tank-fluid { touch-action: none; }
.tank-lettering { z-index: 3; pointer-events: none; }
.tank-copy { position: absolute; inset: 65px 7% 72px; display: flex; flex-direction: column; justify-content: center; align-items: center; pointer-events: none; z-index: 2; }
.fluid-tank .welcome-text { margin: 0; max-width: 100%; font-size: clamp(25px, 3.2vw, 46px); line-height: 1.65; letter-spacing: .06em; font-weight: 400; text-wrap: balance; }
.fluid-tank .welcome-text span { display: inline-block; }
.fluid-tank .beijing-time { margin: 22px 0 0; font-size: clamp(11px, 1.15vw, 16px); letter-spacing: .04em; line-height: 1.8; text-wrap: balance; }
.fluid-tank.fluid-ready .tank-copy { opacity: 0; }
.tank-top, .tank-bottom { position: absolute; left: 25px; right: 25px; z-index: 5; display: flex; align-items: center; justify-content: space-between; gap: 16px; pointer-events: none; font: 11px/1.5 -apple-system, BlinkMacSystemFont, 'PingFang SC', sans-serif; color: #a0bbc2; letter-spacing: .08em; }
.tank-top { top: 20px; }
.tank-bottom { bottom: 18px; justify-content: flex-end; }
.tank-flow-label { display: flex; align-items: center; gap: 9px; }
.tank-buttons { display: flex; gap: 8px; pointer-events: auto; }
.tank-buttons button { appearance: none; border: 1px solid #c6e7ed30; border-radius: 20px; padding: 6px 12px; background: #101c238c; color: #c1d7dc; font: inherit; letter-spacing: .02em; cursor: pointer; }
.tank-buttons button:hover { background: #28414c; }
.tank-buttons button:focus-visible { outline: 2px solid #ace8ef; outline-offset: 3px; }
@media (max-width: 600px) {
  .fluid-tank { height: 410px; margin: 20px auto 40px; border-radius: 18px; }
  .tank-copy { inset: 80px 22px; }
  .fluid-tank .welcome-text { font-size: 27px; }
  .fluid-tank .beijing-time { max-width: 245px; margin-top: 24px; font-size: 11px; }
  .tank-top, .tank-bottom { left: 17px; right: 17px; letter-spacing: .02em; }
  .tank-bottom { flex-wrap: wrap; gap: 9px; }
  .tank-buttons button { padding: 7px 10px; }
}
@media (prefers-reduced-motion: reduce) { .tank-fluid { cursor: default; } }