/* ==========================================================================
   layout.css — the app shell (topbar + stage) and the scrolling doc pages
   ========================================================================== */

/* --------------------------------------------------------------------------
   Game shell: sized to the real visible viewport, never scrolls
   -------------------------------------------------------------------------- */
.shell {
  display: flex;
  flex-direction: column;
  height: 100vh;
  height: 100dvh;
  width: 100%;
  padding-top: env(safe-area-inset-top);
  padding-bottom: env(safe-area-inset-bottom);
  padding-left: env(safe-area-inset-left);
  padding-right: env(safe-area-inset-right);
}

.topbar {
  flex: 0 0 auto;
  height: 50px;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 8px 0 4px;
}
.topbar .back {
  flex: 0 0 auto;
  min-width: var(--tap);
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 3px;
  padding: 0 13px 0 9px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fff;
  color: var(--muted);
  font-size: 20px;
  line-height: 1;
  text-decoration: none;
  cursor: pointer;
}
.topbar .back .bktxt { font-size: 12.5px; font-weight: 700; letter-spacing: .2px; }
.topbar .back:hover { color: var(--text); border-color: var(--line2); }
.topbar .back:active { background: var(--surface3); color: var(--text); }

.topbar .hlp {
  flex: 0 0 auto;
  width: 48px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
  font-size: 20px;
  font-weight: 800;
  line-height: 1;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(91, 87, 240, .30);
}
.topbar .hlp:hover { filter: brightness(1.12); }
.topbar .hlp:active { transform: scale(.95); }

.topbar .ttl {
  flex: 1 1 auto;
  min-width: 0;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.topbar .who {
  flex: 0 0 auto;
  max-width: 42vw;
  height: 34px;
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fff;
  color: var(--muted);
  font-size: 12.5px;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  cursor: pointer;
}
.topbar .who:active { background: var(--surface3); }
.topbar .who b { color: var(--text); font-weight: 700; }

.topbar .snd {
  flex: 0 0 auto;
  width: 38px;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fff;
  color: var(--text);
  font-size: 15px;
  line-height: 1;
  cursor: pointer;
}
.topbar .snd:active { background: var(--surface3); }
.topbar .snd[data-state="off"] { opacity: .5; }
.topbar .snd[data-state="full"] { border-color: var(--action); background: rgba(18, 161, 80, .14); }

.stage {
  flex: 1 1 auto;
  min-height: 0;
  position: relative;
  overflow: hidden;
  background: var(--surface);
  border-top: 1px solid var(--line);
}

canvas.gamecanvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  touch-action: none;
}

/* Roomier once there is desk space, still no page scroll. */
@media (min-width: 860px) and (min-height: 600px) {
  .shell {
    max-width: 1360px;
    margin: 0 auto;
    justify-content: center;
    padding: 0 20px 20px;
  }
  .topbar { height: 60px; padding: 0 4px; }
  .topbar .ttl { font-size: 17px; }
  .stage {
    flex: 0 1 auto;
    width: 100%;
    aspect-ratio: 16 / 9;
    max-height: calc(100dvh - 96px);
    border: 1px solid var(--line);
    border-radius: var(--r-lg);
    box-shadow: 0 24px 60px rgba(17, 23, 38, .22);
  }
}

/* --------------------------------------------------------------------------
   Doc pages: hub and progress. These scroll.
   -------------------------------------------------------------------------- */
.doc {
  max-width: 720px;
  margin: 0 auto;
  padding: calc(20px + env(safe-area-inset-top)) 16px calc(48px + env(safe-area-inset-bottom));
}
.doc h1 { margin: 0 0 6px; font-size: 26px; font-weight: 800; letter-spacing: -.4px; color: var(--text); }
.doc h2 { margin: 30px 0 12px; font-size: 17px; font-weight: 800; color: var(--text); }
.doc p.sub { margin: 0 0 22px; font-size: 14.5px; line-height: 1.65; color: var(--muted); }
.doc .note { margin: 14px 0 0; font-size: 12px; line-height: 1.6; color: var(--muted); }

.backlink {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 40px;
  color: var(--muted);
  font-size: 13.5px;
  font-weight: 700;
  text-decoration: none;
}