:root {
  --bg-deep: #041d2b; /* deep ocean */
  --bg-mid: #063a52; /* mid-teal */
  --bg-surface: #0b5b73; /* surface turquoise */
  --muted: #9fc0c9; /* soft seafoam */
  --accent: #e6fbff; /* pale aqua */
  --card: rgba(6,58,82,0.24);
  --glass: rgba(255,255,255,0.03);
  --page-padding: clamp(12px, 3vw, 24px);
  --gap: clamp(0.25rem, 1.2vh, 0.75rem);
  --max-image-width: min(100vh, 420px);
  --radius: clamp(8px, 1.6vw, 12px);
}

/* Atlantic theme by 30metistevas — oceanic blues and seafoam */

html, body { height: 100%; }

body {
  margin: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: var(--gap);
  min-height: 100vh;
  padding: var(--page-padding);
  box-sizing: border-box;
  font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  color: var(--accent);
  text-align: center;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background:
    radial-gradient(800px 250px at 15% 10%, rgba(255,255,255,0.02), transparent 8%),
    linear-gradient(180deg, var(--bg-deep) 0%, var(--bg-mid) 50%, var(--bg-surface) 100%);
}

h1,h2,p {
  font-size: clamp(1rem, 2.4vw, 1.375rem);
  font-weight: 600;
  margin: 0;
  color: var(--muted);
}

#countdown {
  font-family: 'Space Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, 'Roboto Mono', monospace;
  font-weight: 600;
  font-size: clamp(1.8rem, 9vw, 3.5rem);
  color: var(--accent);
  letter-spacing: 0.02em;
  padding: clamp(0.5rem, 1.4vw, 0.85rem) clamp(0.9rem, 2.8vw, 1.2rem);
  border-radius: var(--radius);
  line-height: 1;
  background: linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.01));
  backdrop-filter: blur(6px) saturate(120%);
  box-shadow: 0 18px 40px rgba(3,23,30,0.55), inset 0 1px 0 rgba(255,255,255,0.02);
  transition: transform 300ms cubic-bezier(.2,.9,.3,1), box-shadow 260ms ease, color 160ms ease;
  border: 1px solid rgba(255,255,255,0.04);
  position: relative;
  z-index: 2;
}

/* smaller on narrow screens */
@media (max-width: 420px) {
  h1 { font-size: clamp(0.95rem, 3.4vw, 1.1rem); }
  #countdown { font-size: clamp(1.4rem, 8vw, 2.2rem); }
}

/* subtle ocean surface overlay */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image: radial-gradient(1200px 400px at 10% 10%, rgba(255,255,255,0.015), transparent 8%),
                    linear-gradient(180deg, rgba(255,255,255,0.01), transparent 40%);
  pointer-events: none;
  mix-blend-mode: screen;
  z-index: -2;
}

/* decorative animated wave at the bottom */
body::after {
  content: "";
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  height: 36vh;
  background-image: url("img/wave.svg");
  background-repeat: no-repeat;
  background-position: 50% 100%;
  background-size: 140% auto;
  opacity: 0.36;
  pointer-events: none;
  z-index: -1;
  will-change: background-position;
  filter: contrast(1.05) saturate(1.05) drop-shadow(0 -6px 18px rgba(3,23,30,0.18));
  animation: waveMove 14s cubic-bezier(.2,.6,.35,.95) infinite;
}

@keyframes waveMove {
  0% { background-position: 50% 100%; }
  25% { background-position: 46% 94%; }
  50% { background-position: 52% 92%; }
  75% { background-position: 48% 90%; }
  100% { background-position: 50% 100%; }
}

/* gentle pulse / swell animation used when countdown updates */
.pulse {
  animation: swell 420ms cubic-bezier(.2,.9,.3,1);
}

@keyframes swell {
  0% { transform: translateY(0) scale(1); box-shadow: 0 12px 34px rgba(3,23,30,0.45); }
  45% { transform: translateY(-3px) scale(1.03); box-shadow: 0 26px 60px rgba(3,23,30,0.55); }
  100% { transform: translateY(0) scale(1); box-shadow: 0 12px 34px rgba(3,23,30,0.45); }
}

/* respect user preference for reduced motion */
@media (prefers-reduced-motion: reduce) {
  #countdown, .pulse { transition: none; animation: none; }
}

/* images */
img {
  max-width: var(--max-image-width);
  width: 100%;
  height: auto;
  display: block;
  margin: clamp(0.5rem, 2.5vh, 1.25rem) auto 0;
  border-radius: 8px;
  box-shadow: 0 8px 30px rgba(3,23,30,0.45);
}

#surprise-img { cursor: pointer; }
#surprise-img:focus { outline: 2px solid rgba(159,192,201,0.12); outline-offset: 4px; }

/* footer */
.site-footer {
  color: var(--muted);
  font-size: clamp(0.75rem, 1.6vw, 0.95rem);
  position: fixed;
  bottom: clamp(8px, 2vh, 12px);
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.01));
  padding: clamp(6px, 1vh, 10px) clamp(10px, 2vw, 14px);
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,0.03);
  z-index: 3;
}

.site-footer a { color: var(--muted); text-decoration: none; display: inline-block; }
.site-footer a:hover, .site-footer a:focus { text-decoration: underline; }
.site-footer a { cursor: pointer; }