:root {
  --ink: #eaf4ff;
}
* { margin: 0; padding: 0; box-sizing: border-box; }

html, body {
  height: 100%;
  overflow: hidden;
  font-family: "Segoe UI", "Helvetica Neue", system-ui, -apple-system, sans-serif;
  color: var(--ink);
  background: #04182b;
}

#c {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  cursor: grab;
}
#c:active { cursor: grabbing; }

body.intro #c {
  filter: brightness(0.55) saturate(1.05);
  transition: filter 2.2s ease;
}
body.sailing #c {
  filter: none;
}

/* ---------- HUD ---------- */
#hud {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 10;
}

#clock {
  position: absolute;
  top: 18px;
  left: 20px;
  font-size: 22px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  text-shadow: 0 1px 12px rgba(0,0,0,.55);
  opacity: 0;
  transition: opacity 1.5s ease;
}
body.sailing #clock { opacity: 1; }

#status {
  position: absolute;
  left: 20px;
  bottom: 18px;
  font-size: 13px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: rgba(234,244,255,.78);
  text-shadow: 0 1px 8px rgba(0,0,0,.5);
  opacity: 0;
  transition: opacity 1.5s ease;
}
body.sailing #status { opacity: 1; }

/* ---------- Intro overlay ---------- */
#overlay-wrap {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: auto;      /* "click anywhere to begin" during intro */
  transition: opacity 2s ease, visibility 2s ease;
}
body.sailing #overlay-wrap {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

#overlay {
  text-align: center;
  /* spans whole sky during intro so "click anywhere" works */
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

#overlay h1 {
  font-size: clamp(44px, 8vw, 84px);
  font-weight: 300;
  letter-spacing: 0.28em;
  text-indent: 0.28em;
  background: linear-gradient(180deg, #fff8e6 0%, #bfe0ff 60%, #64b5f6 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 2px 18px rgba(0,40,90,.6));
  animation: floatIn 2.4s ease both;
}

#overlay-msg {
  margin-top: 26px;
  font-size: 15px;
  line-height: 1.75;
  letter-spacing: .04em;
  color: rgba(234,244,255,.85);
  text-shadow: 0 1px 10px rgba(0,20,50,.7);
  opacity: 0;
  animation: fadeUp 1.6s .5s ease both;
}

#overlay .hint {
  margin-top: 30px;
  font-size: 13px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: #ffdda0;
  text-shadow: 0 1px 8px rgba(0,0,0,.5);
  animation: breathe 2.6s ease-in-out infinite;
  opacity: 0;
  animation: fadeUp 1.6s 1.5s ease both, breathe 2.6s 3.2s ease-in-out infinite;
}

#start {
  margin-top: 26px;
  pointer-events: auto;
  font: inherit;
  font-size: 15px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: #04182b;
  background: linear-gradient(180deg, #ffe9bd, #ffcf7e);
  border: none;
  border-radius: 999px;
  padding: 14px 38px;
  cursor: pointer;
  box-shadow: 0 6px 24px rgba(255,180,80,.35);
  opacity: 0;
  animation: fadeUp 1.4s 2.1s ease both;
  transition: transform .15s ease, box-shadow .15s ease;
}
#start:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(255,190,100,.5);
}
#start:active { transform: translateY(0); }

/* ---------- Animations ---------- */
@keyframes floatIn {
  from { opacity: 0; transform: translateY(-18px) scale(.96); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(14px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes breathe {
  0%, 100% { opacity: .55; }
  50%      { opacity: 1; }
}