/* Lật Mảnh Ghép - kiểu trang (tách từ <style> nội tuyến; CSP không có 'unsafe-inline'). */
html,body{height:100%;margin:0;background:#080b0f;color:#fff;font-family:Segoe UI, Roboto, 'Helvetica Neue', Arial, sans-serif}
/* game container keeps canvas available - canvas is centered and fixed to viewport by scaler */
#gameWrap{position:relative;height:100%;width:100%;overflow:visible}
canvas{display:block;background:#0f1720;border-radius:12px;box-shadow:0 8px 30px rgba(2,6,23,0.7);outline:0}
/* Top bar: HUD + controls in a single fixed row to avoid overlap on small screens */
.topbar{position:fixed;left:12px;right:12px;top:12px;display:flex;align-items:center;justify-content:space-between;gap:12px;z-index:10003;padding:10px 12px;border-radius:12px;background:linear-gradient(180deg, rgba(6,10,14,0.92), rgba(14,20,26,0.88));box-shadow:0 12px 40px rgba(0,0,0,0.6)}
.topbar .hud-row{display:flex;gap:14px;align-items:center}
.topbar .controls{display:flex;gap:8px;align-items:center}
.topbar .top-select{background:rgba(255,255,255,0.03);border:1px solid rgba(255,255,255,0.04);color:#eaf2ff;padding:6px 8px;border-radius:8px;font-size:13px}
/* keep `.ui` for compatibility but don't fix its position (it's inside topbar now) */
.ui{position:relative;font-size:16px;color:#e6eef6}
/* Buttons: subtle lift + shadow for modern feel */
button{font-size:14px;padding:10px 14px;min-height:40px;border-radius:10px;border:0;background:#fff;color:#111;cursor:pointer;transition:transform .14s ease,box-shadow .14s ease,opacity .14s}
button:hover{transform:translateY(-3px);box-shadow:0 8px 24px rgba(2,6,23,0.35)}
button:active{transform:translateY(-1px) scale(.995)}
.settings{position:fixed;right:18px;top:64px;background:linear-gradient(180deg, rgba(10,12,16,0.98), rgba(18,22,28,0.98));border-radius:12px;padding:16px;width:300px;box-shadow:0 12px 40px rgba(0,0,0,0.6);color:#e6eef6;font-size:14px;z-index:10004}
  .settings input[type="text"], .settings input[type="number"], .settings select, .settings input[type="range"]{width:100%;box-sizing:border-box}
  .settings input[type="text"], .settings input[type="number"], .settings select{background:rgba(255,255,255,0.02);border:1px solid rgba(255,255,255,0.04);padding:8px;border-radius:8px;color:#eaf2ff}
  .settings select{color:#eaf2ff;background:rgba(255,255,255,0.02)}
  .settings option{color:#eaf2ff;background:#0e1620}
  .settings select, .settings option{color:#eaf2ff;background:#081018}
  .settings label{font-weight:600}
  .settings .row{display:flex;flex-direction:column;gap:6px;margin-bottom:8px}
.settings h3{margin:0 0 8px 0;font-size:16px}
.settings label{display:block;margin-top:8px;color:#cbd9e6}
.hud-row{display:flex;gap:24px;align-items:center}
.hud-item{background:rgba(255,255,255,0.03);padding:8px 12px;border-radius:10px;transition:transform .18s,opacity .18s}
.hud-item .hud-value{margin-left:6px;font-weight:700;transition:color .22s ease,transform .18s ease;color:inherit}
.hud-item .hud-value.changed{color:#ff6b6b;transform:scale(1.03);text-shadow:0 4px 18px rgba(255,107,107,0.12);transition:color .32s cubic-bezier(.2,.9,.2,1),transform .18s ease}
.hud-item.updated{transform:none}
/* Completion modal */
.modal-overlay{position:fixed;left:0;top:0;right:0;bottom:0;background:rgba(2,6,23,0.65);display:none;align-items:center;justify-content:center;z-index:10005;transition:opacity .22s ease}
.modal-overlay.show{display:flex;opacity:1}
.modal{background:linear-gradient(180deg,#081018,#0e1620);color:#eaf2ff;border-radius:12px;padding:20px;width:min(880px,92%);min-width:320px;max-width:920px;box-shadow:0 30px 80px rgba(0,0,0,0.7);transform:translateY(10px) scale(.98);opacity:0;transition:transform .22s cubic-bezier(.2,.9,.2,1),opacity .22s}
.modal-overlay.show .modal{transform:translateY(0) scale(1);opacity:1}
.modal h2{margin-top:0;color:#fff}
.modal .hs-list{max-height:260px;min-height:260px;overflow:auto;margin-top:8px;padding:8px;background:rgba(255,255,255,0.02);border-radius:8px}
/* difficulty buttons in highscores modal */
.hs-diff-btn{background:transparent;color:#d6e7ef;border:1px solid rgba(255,255,255,0.04);padding:6px 10px;border-radius:8px;cursor:pointer}
.hs-diff-btn.active{background:linear-gradient(90deg,#4aa1c9,#68c0c0);color:#072026;border:0;box-shadow:0 8px 20px rgba(6,12,20,0.6);transform:translateY(-2px)}
.hs-theme-btn{background:transparent;color:#d6e7ef;border:1px solid rgba(255,255,255,0.04);padding:6px 10px;border-radius:8px;cursor:pointer}
.hs-theme-btn.active{background:linear-gradient(90deg,#7ad59e,#68c0c0);color:#072026;border:0;box-shadow:0 8px 20px rgba(6,12,20,0.6);transform:translateY(-2px)}
.hs-theme-btn{background:transparent;color:#d6e7ef;border:1px solid rgba(255,255,255,0.04);padding:6px 10px;border-radius:8px;cursor:pointer}
.hs-theme-btn.active{background:linear-gradient(90deg,#7ad28f,#5fc5a6);color:#072026;border:0;box-shadow:0 8px 20px rgba(6,12,20,0.6);transform:translateY(-2px)}
.hs-player{font-size:14px;padding:6px 8px;border-radius:8px}
/* Highscore control groups border */
#hsDifficultyButtons, #hsThemeButtons{border:1px solid rgba(255,255,255,0.04);padding:6px;border-radius:8px;background:rgba(255,255,255,0.02)}
#hsDifficultyButtons button, #hsThemeButtons button{margin:0}
.hs-controls{display:flex;gap:18px;align-items:center}
.hs-group{display:flex;gap:8px;align-items:center}
.hs-group label{margin:0;white-space:nowrap;color:#d6e7ef;font-weight:700}
/* Highscore items */
.hs-item{display:flex;gap:12px;align-items:center;padding:10px;border-radius:8px;background:rgba(0,0,0,0.12);margin-bottom:8px;color:#e6eef6;opacity:0;transform:translateY(8px);transition:opacity .3s ease,transform .3s ease}
.hs-item.entered{opacity:1;transform:none}
.hs-item strong{display:inline-block;width:48px;color:#a8d0e6}
.hs-meta{color:#a8c0cd;font-size:13px;margin-left:auto}
.modal-notice{background:rgba(96,148,170,0.12);border-radius:8px;padding:8px;margin-bottom:8px;color:#cfe9f6}
/* responsive tweaks */
@media (max-width:900px){
  .settings{right:12px;left:12px;top:64px;bottom:auto;width:auto}
  .modal{min-width:auto;width:calc(100% - 32px);max-width:100%}
  .controls{right:12px}
  .ui{left:12px}
}
@media (max-width:520px){
  .topbar{padding:8px 10px;gap:8px}
  .topbar .hud-row{gap:10px}
  .topbar .controls button{padding:6px 10px;font-size:13px}
  .topbar{flex-wrap:wrap}
}
/* Ensure select dropdown options are readable */
select.top-select, select.top-select option{color:#eaf2ff;background:#081018}
select.top-select option{padding:6px}
select.top-select::-ms-expand{filter:invert(1)}
/* Mobile tweaks: ensure modals fit vertically and controls wrap */
@media (max-width:520px){
  .modal{max-height:calc(100vh - 40px);overflow:auto}
  .modal .hs-list{min-height:120px;max-height:40vh}
  .topbar .controls{flex-wrap:wrap;gap:6px}
  .topbar .controls button, .topbar .controls .top-select{font-size:12px;padding:6px 8px}
  .settings{left:12px;right:12px;top:64px;bottom:auto;width:auto;max-height:calc(100vh - 88px);overflow:auto}
  .modal .row > div{display:flex;flex-direction:column;align-items:flex-start;gap:8px}
  #hsDifficultyButtons, #hsThemeButtons{display:flex;flex-wrap:wrap}
  #hsThemeButtons{margin-top:6px}
}
@media (prefers-reduced-motion: reduce){
  .modal, .modal-overlay, button { transition: none !important; animation: none !important; }
}
/* 2026 large-screen refinement pass */
#gameWrap{background:radial-gradient(circle at 50% 12%, rgba(95,176,214,.16), transparent 34%), #080b0f}
canvas{border:1px solid rgba(255,255,255,.12)}
.modal .hs-list{scrollbar-width:thin;scrollbar-color:#5fb0d6 rgba(255,255,255,.08)}
.hs-controls{flex-wrap:wrap}
#completeSummary{line-height:1.5}
@media (max-width:720px){
  canvas{max-height:calc(100vh - 210px)}
  .modal-actions{gap:8px}
  .modal-actions button,.modal-actions select{min-height:40px}
  .hs-controls,.hs-group{align-items:flex-start}
}