*{box-sizing:border-box}
:root{
  --safe-top:env(safe-area-inset-top,0px);
  --safe-bottom:env(safe-area-inset-bottom,0px);
}
html,body{margin:0;min-height:100%;background:#0f2518;color:#fff;font-family:"Noto Sans KR","Apple SD Gothic Neo",sans-serif}
body{
  min-height:100svh;
  background:
    radial-gradient(circle at 50% 0%,rgba(255,220,96,.16),transparent 38%),
    linear-gradient(180deg,#173d27 0%,#0d2115 100%);
}
button{font:inherit}
.app{
  width:min(100%,760px);
  min-height:100svh;
  margin:0 auto;
  padding:calc(10px + var(--safe-top)) 10px calc(18px + var(--safe-bottom));
  display:flex;
  flex-direction:column;
  justify-content:center;
}
.viewer{
  position:relative;
  width:100%;
  height:min(76svh,980px);
  border-radius:20px;
  overflow:hidden;
  background:#07110b;
  box-shadow:0 16px 45px rgba(0,0,0,.45);
  touch-action:pan-y;
}
.viewer img{
  width:100%;
  height:100%;
  display:block;
  object-fit:contain;
  background:#050807;
  user-select:none;
  transition:opacity .18s ease,transform .18s ease;
}
.viewer img.changing{opacity:.35;transform:scale(.985)}
.page-badge{
  position:absolute;top:14px;left:14px;
  padding:8px 13px;border-radius:999px;
  color:#fff;background:rgba(0,0,0,.58);
  backdrop-filter:blur(7px);
  font-size:14px;font-weight:800;
  border:1px solid rgba(255,255,255,.18);
}
.nav{
  position:absolute;top:50%;transform:translateY(-50%);
  width:48px;height:70px;border:0;border-radius:16px;
  color:#fff;background:rgba(0,0,0,.42);
  backdrop-filter:blur(5px);
  font-size:46px;line-height:1;cursor:pointer;
}
.nav:disabled{opacity:.2;cursor:default}
.prev{left:10px}.next{right:10px}
.tap-start{
  position:absolute;inset:0;
  display:grid;place-items:center;
  background:rgba(0,0,0,.35);
  backdrop-filter:blur(2px);
  transition:opacity .25s ease;
}
.tap-start.hidden{opacity:0;pointer-events:none}
.tap-start button{
  width:min(78%,360px);
  border:1px solid rgba(255,255,255,.4);
  border-radius:22px;
  padding:20px 18px;
  color:#fff;
  background:rgba(17,73,42,.88);
  box-shadow:0 12px 30px rgba(0,0,0,.35);
  cursor:pointer;
}
.tap-start strong,.tap-start small{display:block}
.tap-start strong{font-size:24px;margin:8px 0 5px}
.tap-start small{font-size:13px;opacity:.88;line-height:1.45}
.play-icon{display:inline-grid;place-items:center;width:52px;height:52px;border-radius:50%;background:#fff;color:#18492c;font-size:22px;padding-left:4px}
.controls{display:grid;grid-template-columns:1fr 1fr;gap:9px;margin-top:11px}
.controls button{
  min-height:50px;border:1px solid rgba(255,255,255,.14);
  border-radius:14px;color:#fff;background:rgba(255,255,255,.1);
  font-weight:800;cursor:pointer
}
.controls button:active,.nav:active{transform:scale(.97)}
.nav:active{transform:translateY(-50%) scale(.96)}
.dots{display:flex;justify-content:center;gap:9px;padding:13px 0 5px}
.dot{
  width:11px;height:11px;border-radius:50%;border:0;padding:0;
  background:rgba(255,255,255,.3);cursor:pointer
}
.dot.active{width:26px;border-radius:999px;background:#ffd45b}
.guide{text-align:center;font-size:13px;opacity:.72;margin:4px 0 0}
@media (max-width:520px){
  .app{padding-left:0;padding-right:0;padding-top:var(--safe-top)}
  .viewer{height:78svh;border-radius:0}
  .controls,.dots,.guide{margin-left:10px;margin-right:10px}
  .nav{width:42px;height:62px}
}
@media (orientation:landscape) and (max-height:700px){
  .app{width:100%;padding:0;display:grid;grid-template-columns:1fr 210px;gap:10px}
  .viewer{height:100svh;border-radius:0}
  .controls{grid-template-columns:1fr;margin:12px 10px 0 0;align-content:center}
  .dots,.guide{grid-column:2;margin-right:10px}
}

.version-badge{
  position:absolute;top:14px;right:14px;
  padding:8px 12px;border-radius:999px;
  background:#ffd45b;color:#173d27;
  font-size:13px;font-weight:900;
  box-shadow:0 4px 14px rgba(0,0,0,.25);
}