/* ═══════════════════════════════════════════════════════════════
   playgriff.io — game.css
   Game Runner Shell
   Provides: viewport lockdown, iframe sizing, nav bar, safe-area
   insets, loading/error overlays, and entrance/exit animations.
   ═══════════════════════════════════════════════════════════════ */

/* ── DESIGN TOKENS ─────────────────────────────────────────────
   Mirrors style.css tokens so both files stay in sync.
   To retheme, edit only this :root block.
   ──────────────────────────────────────────────────────────────*/
:root {
  --clr-bg:             #0c0d14;
  --clr-surface:        #13151f;
  --clr-border:         rgba(255, 255, 255, 0.07);
  --clr-accent-violet:  #7c3aed;
  --clr-accent-cyan:    #06b6d4;
  --clr-text-primary:   #f1f2f7;
  --clr-text-secondary: #8892a4;
  --clr-text-muted:     #4a5260;

  --grad-brand: linear-gradient(135deg, #7c3aed, #06b6d4);

  --font-body:    'Space Grotesk', system-ui, sans-serif;
  --font-display: 'Syne',          system-ui, sans-serif;

  --ease-smooth:  cubic-bezier(0.4, 0, 0.2, 1);
  --ease-snappy:  cubic-bezier(0.22, 0.68, 0, 1.2);

  /* Nav bar height — used in both nav and stage offset calc */
  --gnav-h: 52px;

  /*
    CSS env() safe-area insets for notched/island phones.
    Fall back to 0px if the browser doesn't support viewport-fit=cover.
  */
  --sat: env(safe-area-inset-top,    0px);
  --sar: env(safe-area-inset-right,  0px);
  --sab: env(safe-area-inset-bottom, 0px);
  --sal: env(safe-area-inset-left,   0px);
}

/* ═══════════════════════════════════════════════════════════════
   CRITICAL VIEWPORT CONTAINMENT
   ═══════════════════════════════════════════════════════════════
   These rules form the "containment cage" that prevents the mobile
   browser from stealing touch events intended for the game.

   Root causes guarded against:
   • iOS Safari rubber-band / bounce scroll      → position:fixed body
   • Pull-to-refresh (Chrome Android)            → overscroll-behavior:none
   • Browser pinch-zoom chrome                   → viewport meta + touch-action
   • Momentum scroll behind iframe              → overflow:hidden everywhere
   • Double-tap zoom on UI elements             → touch-action:manipulation
   ─────────────────────────────────────────────────────────────── */
html {
  height: 100%;
  width: 100%;
  overflow: hidden;
  overscroll-behavior: none;       /* Chrome/Firefox: kill bounce & pull-refresh */
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  background: var(--clr-bg);
  color: var(--clr-text-primary);
  -webkit-font-smoothing: antialiased;

  /* ─── The four pillars of iOS bounce prevention ─── */
  position: fixed;                 /* Removes body from scroll context entirely   */
  inset: 0;                        /* top/right/bottom/left: 0                    */
  width: 100%;
  height: 100%;
  overflow: hidden;
  overscroll-behavior: none;

  /* Block every browser-native gesture on the outer shell.
     The iframe content is exempted (see .game-iframe below).      */
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
  -webkit-tap-highlight-color: transparent;

  display: flex;
  flex-direction: column;          /* nav stacks above stage vertically           */
}

/* ── ENTRANCE / EXIT PAGE CURTAIN ──────────────────────────────
   A full-viewport overlay that fades out on enter, fades back in
   on "Back to Hub". Controlled by game.js adding/removing .lifted.
   ──────────────────────────────────────────────────────────────*/
.page-curtain {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: var(--clr-bg);
  pointer-events: none;         /* Never blocks clicks during game               */
  opacity: 1;
  transition: opacity 0.42s var(--ease-smooth);
}

.page-curtain.lifted {
  opacity: 0;
}

/* When exiting, JS adds .dropping which re-opaques the curtain  */
.page-curtain.dropping {
  opacity: 1;
  pointer-events: all;
  transition: opacity 0.32s var(--ease-smooth);
}

/* ── NAVIGATION BAR ─────────────────────────────────────────────
   Glassmorphic top bar, always rendered above the iframe.
   Slides fully off-screen when .hidden is applied.
   ──────────────────────────────────────────────────────────────*/
.gnav {
  position: relative;
  z-index: 200;
  flex-shrink: 0;

  /* Glass effect */
  background: rgba(12, 13, 20, 0.85);
  backdrop-filter: blur(20px) saturate(160%);
  -webkit-backdrop-filter: blur(20px) saturate(160%);
  border-bottom: 1px solid var(--clr-border);

  /* Safe-area insets (notch / Dynamic Island) */
  padding-top: var(--sat);
  padding-left: var(--sal);
  padding-right: var(--sar);

  /* Slide-up transition for hide/show */
  transition: transform 0.38s var(--ease-smooth);
  will-change: transform;
}

/* Hidden: slides completely off-screen upward */
.gnav.hidden {
  transform: translateY(calc(-100% - var(--sat)));
}

/* Inner flex row */
.gnav__inner {
  height: var(--gnav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 10px;
  gap: 8px;
}

/* ── Back button ─────────────────────────────── */
.gnav__back {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  flex-shrink: 0;
  padding: 8px 14px 8px 8px;
  border-radius: 999px;
  border: 1px solid var(--clr-border);
  background: rgba(255, 255, 255, 0.07);
  color: var(--clr-text-primary);
  font-family: var(--font-body);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-decoration: none;

  /* Touch-friendly: tap fast, no double-tap zoom */
  min-height: 40px;
  min-width: 44px;
  touch-action: manipulation;

  transition:
    background   0.15s var(--ease-smooth),
    border-color 0.15s var(--ease-smooth);
}

.gnav__back:hover,
.gnav__back:focus-visible {
  background:    rgba(124, 58, 237, 0.2);
  border-color:  rgba(124, 58, 237, 0.5);
}

.gnav__back:active {
  background: rgba(124, 58, 237, 0.38);
  transform: scale(0.96);
}

.gnav__back-icon {
  color: var(--clr-accent-violet);
  flex-shrink: 0;
  transition: transform 0.15s var(--ease-snappy);
}

.gnav__back:hover .gnav__back-icon {
  transform: translateX(-2px);
}

/* ── Game title ──────────────────────────────── */
.gnav__title {
  flex: 1;
  text-align: center;
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  background: var(--grad-brand);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* ── Fullscreen button ───────────────────────── */
.gnav__action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  border-radius: 10px;
  border: 1px solid var(--clr-border);
  background: rgba(255, 255, 255, 0.06);
  color: var(--clr-text-secondary);
  cursor: pointer;
  touch-action: manipulation;

  transition:
    color        0.15s,
    background   0.15s,
    border-color 0.15s;
}

.gnav__action:hover,
.gnav__action:focus-visible {
  color: var(--clr-text-primary);
  background:   rgba(6, 182, 212, 0.15);
  border-color: rgba(6, 182, 212, 0.4);
}

.gnav__action:active {
  transform: scale(0.92);
}

/* ── Collapse handle ─────────────────────────── */
/*
  A small pill that peeks below the nav bar.
  Tapping collapses the nav; tapping it again (or the top-edge
  reveal zone) brings it back.
*/
.gnav__handle {
  display: block;
  position: absolute;
  bottom: -20px;           /* peek below the nav border               */
  left: 50%;
  transform: translateX(-50%);
  width: 52px;
  height: 20px;
  cursor: pointer;
  touch-action: manipulation;
  background: transparent;
  border: none;
  padding: 0;
  z-index: 201;

  /* Draw the pill via pseudo-element */
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding-bottom: 4px;
}

.gnav__handle::before {
  content: '';
  display: block;
  width: 38px;
  height: 4px;
  border-radius: 3px;
  background: rgba(255, 255, 255, 0.18);
  border: 1px solid var(--clr-border);
  transition:
    background 0.18s,
    width      0.18s var(--ease-snappy);
}

.gnav__handle:hover::before,
.gnav__handle:focus-visible::before {
  background: var(--clr-accent-violet);
  width: 46px;
}

/* ── Top-edge reveal zone ────────────────────────────────
   When the nav is hidden, a wider invisible tap target is
   exposed at the very top of the screen so thumbs can
   pull the nav back even in full-screen landscape.
   ──────────────────────────────────────────────────────*/
.gnav-reveal-zone {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: calc(28px + var(--sat));
  z-index: 202;
  cursor: pointer;
  touch-action: manipulation;
  display: none;             /* shown via JS when gnav.hidden */
}

/* ── Landscape compact mode ──────────────────────────────
   On short landscape screens (e.g. phones rotated), reduce
   the nav height so the game gets more vertical space.
   ──────────────────────────────────────────────────────*/
@media (orientation: landscape) and (max-height: 480px) {
  :root { --gnav-h: 38px; }

  .gnav__back-label { display: none; }  /* just show the arrow, save width */
  .gnav__back { padding: 6px 10px; }
  .gnav__title { font-size: 0.82rem; }
}

/* ═══════════════════════════════════════════════════════════════
   GAME STAGE
   The container that fills the remaining viewport below the nav.
   ═══════════════════════════════════════════════════════════════ */
.game-stage {
  flex: 1;                          /* Stretches to fill body after nav bar      */
  position: relative;
  overflow: hidden;
  overscroll-behavior: none;
  background: #000;

  /*
    Bottom safe-area padding so the game doesn't render behind the
    iOS home-indicator bar or Android gesture nav strip.
  */
  padding-bottom: var(--sab);

  /*
    Force a GPU compositing layer.
    This keeps WebGL content from tearing and prevents the browser
    from re-rasterising the stage on every scroll / resize.
  */
  transform: translateZ(0);
  -webkit-transform: translateZ(0);
  will-change: transform;
}

/* ─── THE IFRAME ─────────────────────────────────────────────── */
.game-iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
  margin: 0;
  padding: 0;
  display: block;
  background: #000;

  /*
    IMPORTANT: Do NOT set touch-action: none here.
    The iframe's own document handles all in-game touch events.
    Setting none here would block the game's pointer listeners.
    touch-action: auto restores normal browser pass-through.
  */
  touch-action: auto;
  pointer-events: auto;

  /* Fade-in reveal after iframe loads */
  opacity: 0;
  transition: opacity 0.4s var(--ease-smooth);
}

.game-iframe.loaded {
  opacity: 1;
}

/* ─── LOADING OVERLAY ─────────────────────────────────────────── */
.game-loading {
  position: absolute;
  inset: 0;
  z-index: 10;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 20px;
  background: var(--clr-bg);
  padding: 32px;
  text-align: center;

  transition: opacity 0.4s var(--ease-smooth);
}

.game-loading.done {
  opacity: 0;
  pointer-events: none;
}

/* Pulsing logo */
.loading-logo {
  animation: logo-pulse 2.2s ease-in-out infinite;
}

@keyframes logo-pulse {
  0%, 100% { transform: scale(1);    opacity: 0.85; }
  50%       { transform: scale(1.1); opacity: 1;    }
}

/* Game name in loading screen */
.loading-game-title {
  font-family: var(--font-display);
  font-size: clamp(1.1rem, 5vw, 1.4rem);
  font-weight: 800;
  background: var(--grad-brand);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Simulated progress bar */
.loading-bar-track {
  width: min(260px, 72vw);
  height: 4px;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.08);
  overflow: hidden;
}

.loading-bar-fill {
  height: 100%;
  width: 0%;
  border-radius: 4px;
  background: var(--grad-brand);
  /* Ease-out fill simulates typical game asset loading curve */
  animation: bar-progress 2.4s var(--ease-smooth) forwards;
}

@keyframes bar-progress {
  0%   { width:  0%; }
  25%  { width: 40%; }
  60%  { width: 72%; }
  88%  { width: 90%; }
  100% { width: 100%; }
}

/* "Tap anywhere" hint */
.loading-hint {
  font-size: 0.75rem;
  letter-spacing: 0.07em;
  color: var(--clr-text-muted);
  text-transform: uppercase;
  animation: hint-blink 1.8s ease-in-out infinite 2s both;
}

@keyframes hint-blink {
  0%, 100% { opacity: 0.5; }
  50%       { opacity: 1;   }
}

/* ─── ERROR OVERLAY ───────────────────────────────────────────── */
.game-error {
  position: absolute;
  inset: 0;
  z-index: 20;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  background: var(--clr-bg);
  padding: 40px 32px;
  text-align: center;
}

.game-error[hidden] { display: none; }

.error-icon {
  font-size: 3rem;
  line-height: 1;
}

.error-heading {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--clr-text-primary);
}

.error-body {
  font-size: 0.9rem;
  color: var(--clr-text-secondary);
  max-width: 300px;
  line-height: 1.6;
}

.error-back-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-top: 8px;
  padding: 14px 32px;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 700;
  color: #fff;
  background: var(--grad-brand);
  min-height: 52px;              /* Touch-friendly */
  touch-action: manipulation;
  text-decoration: none;
  transition: filter 0.15s, transform 0.15s;
}

.error-back-btn:hover  { filter: brightness(1.15); }
.error-back-btn:active { transform: scale(0.96); }

/* ── FOCUS STYLES (accessibility) ────────────────────────────── */
:focus-visible {
  outline: 2px solid var(--clr-accent-violet);
  outline-offset: 3px;
  border-radius: 6px;
}

/* ── REDUCED MOTION ──────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration:   0.01ms !important;
    transition-duration:  0.01ms !important;
    animation-iteration-count: 1 !important;
  }

  /* Still show curtain lift instantly */
  .page-curtain        { transition: none; }
  .page-curtain.lifted { opacity: 0; }
}