/* ── Top-bar buttons — dark bg, white text, readable ────────────────────── */
#btn-shop {
  background: linear-gradient(135deg, #f76b1c, #e85d04);
  color: #fff; border: none; padding: 8px 14px; border-radius: 20px;
  font-family: 'Fredoka One', cursive; font-size: 13px; cursor: pointer;
  transition: all .2s; box-shadow: 0 4px 14px rgba(232,93,4,0.5); white-space: nowrap;
}
#btn-shop:hover { transform: scale(1.05); box-shadow: 0 4px 18px rgba(232,93,4,0.7); }

#btn-login {
  background: rgba(8,18,42,0.82); color: #fff;
  border: 1px solid rgba(255,255,255,0.28); padding: 8px 14px; border-radius: 20px;
  font-family: 'Fredoka One', cursive; font-size: 13px; cursor: pointer;
  transition: all .2s; white-space: nowrap; backdrop-filter: blur(10px);
}
#btn-login.logged-in { font-size: 11px; color: rgba(255,255,255,0.7); }
#btn-login:hover { background: rgba(30,50,90,0.9); border-color: rgba(255,255,255,0.5); }

.tl-btn {
  background: rgba(8,18,42,0.82); color: #fff;
  border: 1px solid rgba(255,255,255,0.28); padding: 8px 12px; border-radius: 20px;
  font-family: 'Fredoka One', cursive; font-size: 13px; cursor: pointer;
  transition: all .2s; white-space: nowrap; backdrop-filter: blur(10px);
}
.tl-btn:hover { background: rgba(30,50,90,0.9); border-color: rgba(255,255,255,0.5); color: #fff; }
* ═══════════════════════════════════════════════════
   2048 Drop — style.css (new bg — no pre-drawn board)
   bg.png: 1024×1536
   Logo/ribbon: y=0–28vh
   Board canvas drawn by JS: top=28vh, height=50vh, bottom=78vh
   Bottom area: 78–100vh (menu content, kgames logo)
   ═══════════════════════════════════════════════════ */
:root {
  --cyan:   #4cc9f0;
  --gold:   #ffd60a;
  --red:    #ff3b5c;
  --green:  #2ecc71;
  --dim:    rgba(255,255,255,0.55);
  --glass:  rgba(8,18,42,0.80);
  --card:   rgba(10,20,48,0.93);
  --border: rgba(255,255,255,0.18);
  --radius: 16px;
}

*, *::before, *::after { box-sizing:border-box; margin:0; padding:0; }
html, body {
  width:100%; height:100%; overflow:hidden;
  font-family:'Nunito',sans-serif; color:#fff;
  touch-action:none; -webkit-tap-highlight-color:transparent; user-select:none;
  background-color:#1a1a2e; /* dark neutral — themes set canvas bg */
}
body::before {
  content:''; position:fixed; inset:0; z-index:0;
  background-image:url('bg.png');
  background-size:auto 100vh;
  background-position:center top;
  background-repeat:no-repeat;
}

/* ── Screens ──────────────────────────────────────────────────────────────── */
.screen { position:fixed; inset:0; z-index:10; display:flex; flex-direction:column; align-items:center; }
.screen.hidden { display:none !important; }
#top-right.hidden, #top-left.hidden { display:none !important; }

/* ── Top bars — match other kgames: fixed at screen corners ─────────────── */
#top-right {
  position:fixed; top:12px; right:12px; z-index:1000;
  display:flex; gap:6px; align-items:center;
}
#top-left {
  position:fixed; top:12px; left:12px; z-index:1000;
  display:flex; gap:6px; align-items:center;
}










/* ══════════════════════════════
   MENU SCREEN
   Content centred over bottom area (below board ~78vh)
   ══════════════════════════════ */
#screen-menu { justify-content:flex-start; }

#menu-overlay {
  position:fixed;
  top:44vh;
  left:50%; transform:translateX(-50%);
  width:min(100vw, calc(100vh * 0.6667));
  display:flex; flex-direction:column; align-items:center;
  gap:10px; padding:0 16px;
}

.menu-stats { display:flex; gap:8px; justify-content:center; }
.stat-pill {
  background:var(--glass); backdrop-filter:blur(10px);
  border:2px solid var(--border); border-radius:20px;
  padding:5px 14px; display:flex; flex-direction:column; align-items:center;
  min-width:66px; box-shadow:0 4px 14px rgba(0,0,0,0.45);
}
.coin-pill { flex-direction:row; gap:5px; align-items:center; padding:5px 12px; }
.coin-lbl  { font-size:16px; line-height:1; }
.stat-lbl  { font-size:8px; letter-spacing:1.2px; color:var(--dim); font-weight:800; text-transform:uppercase; }
.stat-val  { font-family:'Fredoka One',cursive; font-size:18px; line-height:1.15; }
.stat-val.gold { color:var(--gold); }
.stat-val.cyan { color:var(--cyan); }

.play-btn {
  background:linear-gradient(135deg,#43e97b,#38f9d7);
  border:3px solid rgba(255,255,255,0.55);
  color:#145a32; font-family:'Fredoka One',cursive;
  font-size:20px; padding:11px 0; border-radius:50px;
  cursor:pointer; width:80%; max-width:260px;
  box-shadow:0 5px 18px rgba(56,249,215,0.45), 0 3px 0 #0e6b38; transition:all .15s;
}
.play-btn:hover  { transform:translateY(-2px); box-shadow:0 9px 24px rgba(56,249,215,0.5), 0 3px 0 #0e6b38; }
.play-btn:active { transform:translateY(1px); }

.daily-btn {
  display:none;
  background:linear-gradient(135deg,#f9a825,#e65100);
  border:3px solid rgba(255,255,255,0.45);
  color:#fff; font-family:'Fredoka One',cursive;
  font-size:13px; padding:9px 0; border-radius:50px;
  cursor:pointer; width:80%; max-width:260px;
  box-shadow:0 4px 14px rgba(249,168,37,0.45); transition:all .15s;
}
.daily-btn.visible { display:block; }
.site-link { font-size:11px; color:rgba(255,255,255,0.4); text-decoration:none; font-weight:700; }

/* ══════════════════════════════
   GAME SCREEN
   Board: top=28vh, height=50vh, centred
   ══════════════════════════════ */
#screen-game { justify-content:flex-start; align-items:center; }

/* Game grid canvas — drawn board over sandy path */
#game-canvas {
  position:absolute;
  top:25vh;
  height:42vh;
  left:50%; transform:translateX(-50%);
  width:min(78vw, 52vh);
  cursor:pointer; touch-action:none; background:transparent;
}

/* Drop-zone arrows — just above board */
#drop-zones {
  position:absolute;
  top:calc(25vh - 52px);
  left:50%; transform:translateX(-50%);
  width:min(78vw, 52vh);
  height:52px; background:transparent; cursor:pointer;
}

/* HUD: score / next / best — in ribbon area above drop-zones
   Ribbon top ≈ 15vh, ribbon bottom ≈ 26vh
   Place HUD at bottom of ribbon: centred at ~24vh              */
#game-hud {
  display:none; /* score/best moved to right strip */
}

.hud-pill {
  background:rgba(8,18,42,0.88); backdrop-filter:blur(10px);
  border:2px solid rgba(255,255,255,0.24); border-radius:14px;
  padding:3px 11px; display:flex; flex-direction:column; align-items:center;
  box-shadow:0 2px 8px rgba(0,0,0,0.55); min-width:56px;
}
.hud-lbl { font-size:7px; letter-spacing:1px; color:var(--dim); font-weight:800; text-transform:uppercase; line-height:1.2; }
.hud-val { font-family:'Fredoka One',cursive; font-size:14px; line-height:1.2; color:#fff; }
.hud-val.cyan { color:var(--cyan); }
.hud-val.gold { color:var(--gold); }

/* NEXT tile box in HUD */
.next-hud-box {
  background:rgba(8,18,42,0.88); backdrop-filter:blur(10px);
  border:2px solid rgba(255,255,255,0.24); border-radius:12px;
  padding:3px 6px; display:flex; flex-direction:column; align-items:center; gap:1px;
  box-shadow:0 2px 8px rgba(0,0,0,0.55);
}
#next-tile { border-radius:7px; display:block; }

.badge-2x {
  position:absolute; top:calc(25vh - 22px); left:50%; transform:translateX(-50%);
  background:linear-gradient(135deg,var(--gold),#ff6f00);
  color:#1a0500; font-family:'Fredoka One',cursive;
  font-size:11px; padding:2px 12px; border-radius:20px;
  box-shadow:0 2px 10px rgba(255,111,0,0.55); z-index:25;
}

/* ── Side strips — centred between bg edge and board edge ─────────────────
   bg image width = min(100vw, 66.67vh)
   Board half-width = min(39vw, 26vh)
   bg half-width = min(50vw, 33.33vh)
   Gap half = min(50vw,33.33vh) - min(39vw,26vh)
   At typical desktop (vh=800, vw=1511): bg_hw=533/2=267, board_hw=416/2=208, gap=59px
   Strip centred at bg_left + gap/2 = image_left + gap/2 from board left
   Midpoint: 50vw - (33.33vh + 26vh)/2 = 50vw - 29.67vh                      */
.side-strip {
  width:min(10vw, 6.2vh);
  height:60vh;
  position:absolute;
  top:22vh;
  background:var(--glass); backdrop-filter:blur(14px);
  border:2px solid rgba(255,255,255,0.15);
  border-radius:var(--radius);
  box-shadow:0 6px 24px rgba(0,0,0,0.5), inset 0 1px 0 rgba(255,255,255,0.1);
  display:flex; flex-direction:column; align-items:center; gap:3px; padding:5px 3px;
  overflow:hidden;
}
/* strips flush against canvas edges — works on all screen sizes */
#strip-left  { left:  calc(50vw - min(39vw, 26vh) - min(10vw, 6.2vh) - 4px); }
#strip-right { right: calc(50vw - min(39vw, 26vh) - min(10vw, 6.2vh) - 4px); }

.strip-sep { flex:1; }

.pu-slot {
  position:relative;
  width:min(6.5vw,4.2vh); height:min(6.5vw,4.2vh); min-width:26px; min-height:26px;
  background:rgba(255,255,255,0.05); border:2px solid rgba(255,255,255,0.1);
  border-radius:10px; display:flex; align-items:center; justify-content:center;
  cursor:pointer; transition:all .15s; opacity:0.28;
}
.pu-slot.has-powerup { opacity:1; border-color:rgba(76,201,240,0.5); background:rgba(76,201,240,0.12); }
.pu-slot.has-powerup:hover { transform:scale(1.1); box-shadow:0 0 12px rgba(76,201,240,0.5); }
.pu-ico { font-size:clamp(13px,3.2vw,18px); line-height:1; }
.pu-cnt { position:absolute; bottom:1px; right:2px; font-size:9px; font-weight:900; color:var(--cyan); font-family:'Fredoka One',cursive; line-height:1; }

.mute-btn {
  width:min(6vw,4vh); height:min(6vw,4vh); min-width:24px; min-height:24px;
  background:rgba(255,255,255,0.07); border:2px solid var(--border);
  border-radius:9px; font-size:clamp(11px,2.8vw,14px); cursor:pointer;
  display:flex; align-items:center; justify-content:center; color:var(--dim); transition:all .15s;
}
.mute-btn:hover { background:rgba(255,255,255,0.15); color:#fff; }

.side-stat {
  background:rgba(255,255,255,0.07); border:1px solid rgba(255,255,255,0.12);
  border-radius:9px; padding:3px 2px; width:calc(100% - 4px);
  display:flex; flex-direction:column; align-items:center; gap:0;
}

/* ═══════════════════════════════
   OVERLAY CARDS
   ═══════════════════════════════ */
.screen:not(#screen-menu):not(#screen-game) { justify-content:center; padding:16px; }

.overlay-card {
  background:var(--card); backdrop-filter:blur(18px);
  border:2px solid rgba(255,255,255,0.14); border-radius:24px;
  padding:24px 20px 20px; width:100%; max-width:380px; max-height:90vh;
  overflow-y:auto; position:relative;
  box-shadow:0 20px 60px rgba(0,0,0,0.65), inset 0 1px 0 rgba(255,255,255,0.12);
}
.overlay-card.wide   { max-width:480px; }
.overlay-card.narrow { max-width:340px; }

.card-title { font-family:'Fredoka One',cursive; font-size:28px; text-align:center; margin-bottom:5px; letter-spacing:1px; }
.card-title.cyan { color:var(--cyan); }
.card-title.gold { color:var(--gold); }
.card-title.red  { color:var(--red);  }
.card-sub { font-size:12px; color:var(--dim); text-align:center; margin-bottom:14px; }

.close-btn {
  position:absolute; top:12px; right:14px; width:32px; height:32px; border-radius:10px;
  background:rgba(255,255,255,0.08); border:none; color:var(--dim); font-size:22px;
  cursor:pointer; display:flex; align-items:center; justify-content:center; transition:all .15s;
}
.close-btn:hover { background:rgba(255,255,255,0.16); color:#fff; }

.go-score { font-family:'Fredoka One',cursive; font-size:56px; color:var(--cyan); text-align:center; line-height:1; margin:8px 0; text-shadow:0 0 20px rgba(76,201,240,0.5); }
.go-stats { display:flex; justify-content:space-between; font-size:12px; color:var(--dim); margin-bottom:12px; padding:0 4px; }
.go-stats strong { color:#fff; }
.new-best-badge { font-family:'Fredoka One',cursive; font-size:16px; color:var(--gold); text-align:center; margin-bottom:12px; animation:pulse 1s ease-in-out infinite alternate; }
@keyframes pulse { from{opacity:0.7} to{opacity:1;transform:scale(1.05)} }

.card-btn { width:100%; padding:13px; border-radius:50px; font-family:'Fredoka One',cursive; font-size:15px; cursor:pointer; border:none; transition:all .15s; margin-bottom:9px; display:block; text-align:center; }
.card-btn.primary { background:linear-gradient(135deg,#43e97b,#38f9d7); color:#145a32; box-shadow:0 4px 16px rgba(56,249,215,0.45),0 2px 0 #0e6b38; }
.card-btn.primary:hover { transform:translateY(-2px); }
.card-btn.secondary { background:rgba(255,255,255,0.07); border:2px solid var(--border); color:var(--dim); }
.card-btn.secondary:hover { background:rgba(255,255,255,0.13); color:#fff; }

.text-input { width:100%; padding:12px 14px; border-radius:12px; background:rgba(255,255,255,0.07); border:2px solid rgba(76,201,240,0.25); color:#fff; font-family:'Nunito',sans-serif; font-size:14px; outline:none; margin-bottom:10px; display:block; transition:border-color .2s; text-align:center; }
.text-input::placeholder { color:rgba(255,255,255,0.3); }
.form-error { color:var(--red); font-size:12px; text-align:center; min-height:18px; margin-bottom:8px; }
.auth-switch { font-size:12px; color:var(--dim); text-align:center; margin-top:6px; }
.link { color:var(--cyan); text-decoration:none; font-weight:800; }

/* ── Shop ─────────────────────────────────────────────────────────────────── */
.shop-balance { font-size:14px; color:var(--dim); text-align:center; margin-bottom:12px; display:flex; align-items:center; justify-content:center; gap:5px; font-weight:700; }
.shop-balance > span:first-child { font-family:'Fredoka One',cursive; font-size:18px; color:var(--gold); }
.coin-emoji { font-size:16px; line-height:1; display:inline-flex; align-items:center; }

.shop-tabs-row { display:flex; gap:5px; margin-bottom:12px; flex-wrap:wrap; }
.shop-tab { flex:1; min-width:60px; padding:7px 6px; border-radius:22px; font-family:'Fredoka One',cursive; font-size:11px; background:rgba(255,255,255,0.06); border:2px solid rgba(255,255,255,0.1); color:var(--dim); cursor:pointer; transition:all .15s; text-align:center; }
.shop-tab.active { background:rgba(76,201,240,0.18); border-color:var(--cyan); color:var(--cyan); }

.shop-items-grid { display:grid; grid-template-columns:repeat(auto-fill,minmax(126px,1fr)); gap:9px; max-height:360px; overflow-y:auto; padding:2px; }
.shop-item { background:rgba(255,255,255,0.05); border:2px solid rgba(255,255,255,0.1); border-radius:14px; padding:11px 10px; display:flex; flex-direction:column; gap:6px; transition:border-color .15s; }
.shop-item.active { border-color:var(--cyan); background:rgba(76,201,240,0.08); }
.shop-item-header { display:flex; align-items:center; gap:5px; flex-wrap:wrap; }
.item-name { font-family:'Fredoka One',cursive; font-size:12px; color:#fff; }
.item-price-tag { font-family:'Fredoka One',cursive; font-size:12px; color:var(--gold); display:flex; align-items:center; gap:2px; margin-left:auto; }
.item-desc { font-size:10px; color:var(--dim); line-height:1.4; }
.badge-active { font-size:10px; color:var(--green); font-weight:900; margin-left:auto; }
.swatch-row { display:flex; gap:3px; flex-wrap:wrap; }
.coin-icon-shop { font-size:13px; line-height:1; display:inline-block; vertical-align:middle; margin-right:2px; }

.shop-action-btn { padding:7px 8px; border-radius:10px; font-size:12px; font-family:'Fredoka One',cursive; cursor:pointer; border:none; width:100%; transition:all .15s; display:flex; align-items:center; justify-content:center; gap:3px; }
.btn-buy { background:rgba(76,201,240,0.18); color:var(--cyan); border:2px solid rgba(76,201,240,0.4); }
.btn-buy:hover:not(.disabled) { background:rgba(76,201,240,0.32); }
.btn-buy.disabled { opacity:0.35; cursor:not-allowed; }
.btn-equip { background:rgba(46,204,113,0.18); color:var(--green); border:2px solid rgba(46,204,113,0.4); }
.btn-equip:hover { background:rgba(46,204,113,0.32); }

.paypal-note,.paypal-footer { font-size:10px; color:var(--dim); text-align:center; grid-column:1/-1; padding:3px 0; }
.paypal-pack { grid-column:1/-1; display:flex; justify-content:space-between; align-items:center; background:rgba(255,255,255,0.04); border:2px solid rgba(255,255,255,0.1); border-radius:14px; padding:12px; }
.paypal-pack:hover { border-color:rgba(255,255,255,0.2); }
.pack-left { display:flex; gap:11px; align-items:center; }
.pack-emoji { font-size:28px; }
.pack-label { font-family:'Fredoka One',cursive; font-size:13px; }
.pack-bonus { font-size:10px; font-weight:800; margin-top:2px; }
.pack-price { font-family:'Fredoka One',cursive; font-size:15px; text-align:right; margin-bottom:5px; }
.pp-btn-wrap { min-width:90px; min-height:36px; display:flex; align-items:center; justify-content:center; }
.pp-loading { font-size:10px; color:var(--dim); }
.pp-login-btn { background:rgba(76,201,240,0.18); color:var(--cyan); border:2px solid var(--cyan); border-radius:8px; padding:6px 10px; font-size:10px; cursor:pointer; font-family:'Fredoka One',cursive; }

/* ── Leaderboard ──────────────────────────────────────────────────────────── */
.lb-tab-row { display:flex; gap:8px; margin-bottom:12px; }
.lb-tab { flex:1; padding:8px; border-radius:22px; text-align:center; font-family:'Fredoka One',cursive; font-size:12px; background:rgba(255,255,255,0.06); border:2px solid rgba(255,255,255,0.1); color:var(--dim); cursor:pointer; transition:all .15s; }
.lb-tab.active { background:rgba(255,214,10,0.16); border-color:var(--gold); color:var(--gold); }
.lb-row { display:flex; align-items:center; gap:10px; padding:9px 12px; border-radius:11px; margin-bottom:5px; background:rgba(255,255,255,0.04); border:1px solid rgba(255,255,255,0.08); }
.lb-row.lb-me { background:rgba(76,201,240,0.1); border-color:rgba(76,201,240,0.3); }
.lb-rank { font-size:16px; min-width:28px; text-align:center; }
.lb-name { flex:1; font-weight:700; overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
.lb-score { font-family:'Fredoka One',cursive; color:var(--gold); font-size:14px; }
.lb-empty { text-align:center; padding:24px; color:var(--dim); font-size:13px; }

/* ── Achievements ─────────────────────────────────────────────────────────── */
.ach-scroll { max-height:420px; overflow-y:auto; }
.ach-cat { margin-bottom:14px; }
.ach-cat-title { font-family:'Fredoka One',cursive; font-size:11px; letter-spacing:1px; color:var(--cyan); padding:6px 0 4px; border-bottom:1px solid rgba(76,201,240,0.2); margin-bottom:7px; }
.ach-row { display:flex; align-items:center; gap:10px; padding:8px 10px; border-radius:11px; margin-bottom:4px; }
.ach-row.unlocked { background:rgba(46,204,113,0.07); border:1px solid rgba(46,204,113,0.2); }
.ach-row.locked   { background:rgba(255,255,255,0.02); border:1px solid rgba(255,255,255,0.06); opacity:0.55; }
.ach-icon { font-size:20px; flex-shrink:0; }
.ach-info { flex:1; }
.ach-name { font-size:12px; font-weight:800; }
.ach-desc { font-size:10px; color:var(--dim); margin-top:1px; }
.ach-check { color:var(--green); font-size:16px; font-weight:900; }
.ach-xp { font-size:10px; color:var(--cyan); font-weight:800; white-space:nowrap; }
.ach-total { text-align:center; padding:10px; font-size:11px; color:var(--dim); }

/* ── Toast ────────────────────────────────────────────────────────────────── */
#toast { position:fixed; top:22.5vh; left:50%; transform:translateX(-50%);
  background:rgba(10,20,45,0.96); backdrop-filter:blur(12px);
  border:2px solid rgba(76,201,240,0.35); border-radius:28px;
  padding:10px 24px; font-family:'Fredoka One',cursive; font-size:15px;
  color:#fff; white-space:nowrap; pointer-events:none; z-index:9999;
  opacity:0; transition:opacity .2s, transform .2s, background .2s, border-color .2s;
  box-shadow:0 6px 28px rgba(0,0,0,0.55); }
#toast.visible { opacity:1; }
#toast strong { font-size:17px; }


/* ── Next tile overlay — between bg "2" and "16" tiles, with NEXT label ─── */
#next-tile-overlay {
  position: fixed;
  top: 68vh;
  left: 50%;
  transform: translateX(-50%);
  z-index: 20;
  pointer-events: none;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}
#next-tile-overlay .next-overlay-label {
  font-family: 'Fredoka One', cursive;
  font-size: clamp(10px, 1.4vh, 14px);
  color: rgba(255,255,255,0.85);
  letter-spacing: 2px;
  text-shadow: 0 1px 4px rgba(0,0,0,0.6);
}
#next-tile-overlay canvas {
  width: min(9vh, 13vw);
  height: min(9vh, 13vw);
  border-radius: 16%;
  display: block;
  box-shadow: 0 4px 16px rgba(0,0,0,0.4);
}


/* Score/best in right strip — smaller font to fit long numbers */
#strip-right .hud-val {
  font-size: clamp(10px, 1.3vh, 13px);
  line-height: 1.1;
  word-break: break-all;
  text-align: center;
  max-width: 100%;
}
#strip-right .hud-lbl {
  font-size: 7px;
}



/* ── Right-strip nav icon buttons (gameplay: shop, lb, ach, login) ────────── */
.strip-nav-btn {
  width: calc(100% - 4px); height: min(6.5vw, 4.2vh); min-height: 26px;
  background: rgba(255,255,255,0.07); border: 1px solid rgba(255,255,255,0.15);
  border-radius: 8px; font-size: clamp(13px, 2.5vh, 16px); line-height: 1;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; transition: all .15s; color: #fff;
}
.strip-nav-btn:hover { background: rgba(76,201,240,0.18); border-color: var(--cyan); transform: scale(1.08); }
/* ── Coin icon — CSS-based for universal rendering (no emoji font needed) ──── */
.coin-icon-shop, .coin-icon-inline {
  display: inline-block;
  width: 14px; height: 14px;
  background: radial-gradient(circle at 35% 35%, #ffe066, #f5a623, #c8820a);
  border-radius: 50%;
  border: 1.5px solid rgba(255,255,255,0.5);
  box-shadow: 0 1px 3px rgba(0,0,0,0.4), inset 0 1px 0 rgba(255,255,255,0.3);
  vertical-align: middle;
  margin-right: 3px;
  position: relative;
  flex-shrink: 0;
}
.coin-icon-shop {
  width: 13px; height: 13px;
}
/* Coin in HUD / stat pills uses emoji fallback + CSS */
.coin-lbl { font-size: 16px; line-height: 1; }

/* ── Overlay screens sit on top of game — game stays visible underneath ───── */
#screen-shop, #screen-leaderboard, #screen-achievements,
#screen-auth, #screen-changepw, #screen-gameover {
  background: rgba(0,0,0,0.72);
  backdrop-filter: blur(4px);
  z-index: 50;
}
/* ── Scrollbars ───────────────────────────────────────────────────────────── */
::-webkit-scrollbar { width:4px; }
::-webkit-scrollbar-thumb { background:rgba(76,201,240,0.35); border-radius:2px; }
::-webkit-scrollbar-track { background:transparent; }