*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
:root{
  --bg-deep:#060a18;--bg-mid:#0d1530;--gold:#f0c14b;--gold-bright:#ffd966;
  --gold-glow:rgba(240,193,75,.35);--ink:#e8e4f0;--ink-dim:#9a93b8;--ink-mute:#6b6588;
  --panel:rgba(15,22,50,.85);--panel-border:rgba(240,193,75,.18);
  --cyan:#36d6e7;--fire:#ff6b35;--leaf:#52c41a;--moon:#4a9eff;--purple:#b37feb;
}
html{scroll-behavior:smooth;font-size:16px}
body{background:var(--bg-deep);color:var(--ink);font-family:'Noto Sans Bengali','Segoe UI',sans-serif;overflow-x:hidden;min-height:100vh}
#particles{position:fixed;top:0;left:0;width:100%;height:100%;pointer-events:none;z-index:0}

.screen{display:none;min-height:100vh;position:relative;z-index:1}
.screen.active{display:block}
#title-screen.active,#prologue-screen.active,#complete-screen.active{display:flex;flex-direction:column;align-items:center;justify-content:center}
#title-screen,#prologue-screen{min-height:100vh;text-align:center;padding:2rem;background:radial-gradient(ellipse at center,#0d1535 0%,#060a18 70%)}

.title-arabic{font-family:'Amiri',serif;font-size:clamp(1.3rem,3.5vw,2rem);color:var(--cyan);opacity:.7;margin-bottom:.5rem;letter-spacing:.05em}
.title-main{font-family:'Cinzel',serif;font-size:clamp(1.8rem,5.5vw,4rem);font-weight:900;background:linear-gradient(135deg,var(--gold-bright),var(--cyan),var(--gold));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;letter-spacing:.03em;line-height:1.15;margin-bottom:.5rem;animation:titlePulse 4s ease-in-out infinite}
.title-sub{font-size:clamp(.95rem,2.2vw,1.3rem);color:var(--ink-dim);font-weight:600;margin-bottom:2.5rem}
.title-quote{max-width:580px;font-size:clamp(.85rem,1.4vw,1rem);color:var(--ink-mute);line-height:1.8;font-style:italic;border-left:2px solid var(--gold-glow);padding-left:1.5rem;margin-bottom:2.5rem;text-align:left}
.start-btn{font-family:'Cinzel',serif;font-size:clamp(1rem,1.8vw,1.25rem);font-weight:700;padding:1rem 3rem;background:linear-gradient(135deg,var(--cyan),#1a9aaa);color:#060a18;border:none;border-radius:50px;cursor:pointer;letter-spacing:.08em;text-transform:uppercase;box-shadow:0 0 40px rgba(54,214,231,.3),0 4px 20px rgba(0,0,0,.5);transition:all .4s ease}
.start-btn:hover{transform:translateY(-3px) scale(1.05);box-shadow:0 0 60px rgba(54,214,231,.4),0 6px 30px rgba(0,0,0,.6)}
.start-btn:active{transform:translateY(0) scale(1.02)}
@keyframes titlePulse{0%,100%{filter:drop-shadow(0 0 20px rgba(54,214,231,.25))}50%{filter:drop-shadow(0 0 40px rgba(54,214,231,.4))}}

.prologue-body{max-width:640px;text-align:left}
.prologue-body p{font-size:clamp(.95rem,1.5vw,1.1rem);line-height:2;color:var(--ink);margin-bottom:1rem}
.prologue-body p.en{color:var(--ink-mute);font-style:italic;font-size:.875rem;line-height:1.7;margin-top:-0.5rem;margin-bottom:1.4rem;padding-left:1rem;border-left:2px solid rgba(240,193,75,.08)}
.prologue-body .p-divider{border:none;border-top:1px solid var(--panel-border);margin:1.5rem 0}
.prologue-title{font-family:'Cinzel',serif;font-size:clamp(1.1rem,2.3vw,1.5rem);font-weight:700;color:var(--gold-bright);margin-bottom:1.5rem;text-align:center}

#hud{position:sticky;top:0;z-index:100;background:rgba(6,10,24,.92);backdrop-filter:blur(12px);border-bottom:1px solid var(--panel-border);padding:.6rem 1rem;display:flex;align-items:center;justify-content:space-between;gap:.6rem;flex-wrap:wrap}
.hud-rank{font-family:'Cinzel',serif;font-size:clamp(.8rem,1.4vw,1rem);font-weight:700;color:var(--cyan);display:flex;align-items:center;gap:.4rem}
.hud-level{font-size:.8rem;color:var(--ink-dim);background:rgba(54,214,231,.1);padding:.2rem .7rem;border-radius:20px;border:1px solid var(--panel-border)}
.hud-xp-wrap{flex:1;max-width:260px;min-width:100px}
.hud-xp-bar{height:8px;background:rgba(255,255,255,.08);border-radius:10px;overflow:hidden;border:1px solid rgba(54,214,231,.15)}
.hud-xp-fill{height:100%;background:linear-gradient(90deg,var(--fire),var(--gold-bright),var(--cyan));border-radius:10px;transition:width .8s cubic-bezier(.4,0,.2,1);box-shadow:0 0 10px rgba(54,214,231,.4)}
.hud-xp-text{font-size:0.75rem;color:var(--ink-mute);text-align:center;margin-top:.2rem}
.hud-btn{font-size:0.8rem;color:var(--ink-mute);background:none;border:1px solid var(--panel-border);border-radius:12px;padding:.25rem .55rem;cursor:pointer;transition:all .3s;font-family:'Noto Sans Bengali',sans-serif;white-space:nowrap}
.hud-btn:hover{color:var(--cyan);border-color:var(--cyan)}
.hud-btn.danger:hover{color:var(--fire);border-color:var(--fire)}

#map-screen{padding:1rem .5rem 3rem}
.map-header{text-align:center;padding:1.5rem 1rem 1rem}
.map-header h2{font-family:'Cinzel',serif;font-size:clamp(1.3rem,2.8vw,1.9rem);font-weight:700;color:var(--gold-bright);margin-bottom:.3rem}
.map-header p{color:var(--ink-mute);font-size:.9rem}
.doors-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:1.2rem;max-width:1000px;margin:0 auto;padding:1.5rem 1rem}
.map-phase-divider{grid-column:1/-1;text-align:center;padding:1.5rem 0 .5rem;margin:.5rem 0;border-top:1px dashed var(--panel-border)}
.map-phase-divider span{font-family:'Cinzel',serif;font-size:.85rem;color:var(--gold-bright);letter-spacing:.1em;opacity:.8}
.map-phase-divider.phase-3 span{color:#42a5f5}
.map-phase-divider.phase-4 span{color:#d4a574}
.map-phase-divider.phase-5 span{color:#8d6e63}
.map-phase-divider.phase-6 span{color:#6a1b9a}
.door-card{position:relative;background:var(--panel);border:1px solid var(--panel-border);border-radius:16px;padding:1.5rem;cursor:pointer;transition:all .4s cubic-bezier(.4,0,.2,1);overflow:hidden;min-height:180px;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center}
.door-card:hover{transform:translateY(-4px);border-color:var(--cyan);box-shadow:0 8px 30px rgba(0,0,0,.4),0 0 30px rgba(54,214,231,.2)}
.door-card:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-color:var(--cyan)}
.door-card.locked{opacity:.4;cursor:not-allowed;filter:grayscale(.7)}
.door-card.locked:hover{transform:none;box-shadow:none}
.door-card.completed{border-color:var(--leaf)}
.door-card.completed::after{content:'✓ সম্পন্ন';position:absolute;top:.8rem;right:.8rem;font-size:0.75rem;color:var(--leaf);font-weight:700;background:rgba(82,196,26,.1);padding:.2rem .5rem;border-radius:10px}
.door-card.next-door{border-color:var(--cyan);animation:nextPulse 2.5s ease-in-out infinite}
.door-card.next-door::before{content:'▶ এখানে যাও';position:absolute;top:.8rem;right:.8rem;font-size:0.75rem;color:var(--cyan);font-weight:700;background:rgba(54,214,231,.12);padding:.2rem .5rem;border-radius:10px}
@keyframes nextPulse{0%,100%{box-shadow:0 0 15px rgba(54,214,231,.2)}50%{box-shadow:0 0 40px rgba(54,214,231,.3),0 0 70px rgba(54,214,231,.08)}}
.door-num{font-family:'Cinzel',serif;font-size:0.75rem;color:var(--ink-mute);letter-spacing:.15em;margin-bottom:.5rem}
.door-icon{font-size:2.5rem;margin-bottom:.6rem;line-height:1}
.door-title{font-family:'Cinzel',serif;font-weight:700;font-size:1.1rem;color:var(--ink);margin-bottom:.3rem}
.door-subtitle{font-size:0.78rem;color:var(--ink-dim);margin-bottom:.5rem}
.door-tech{font-size:0.78rem;color:var(--cyan);font-weight:600;background:rgba(54,214,231,.08);padding:.2rem .6rem;border-radius:8px}
.door-lock-icon{font-size:1.5rem;color:var(--ink-mute);margin-top:.5rem}
.door-lock-hint{font-size:0.78rem;color:var(--ink-mute);margin-top:.3rem;font-style:italic}

#story-screen{padding:0;min-height:100vh}
.story-back{position:sticky;top:0;z-index:50;padding:.5rem 1rem;background:rgba(6,10,24,.92);backdrop-filter:blur(8px);border-bottom:1px solid var(--panel-border)}
.back-btn{font-family:'Noto Sans Bengali',sans-serif;font-size:.85rem;color:var(--ink-dim);background:none;border:none;cursor:pointer;padding:.3rem .6rem;border-radius:8px;transition:color .3s}
.back-btn:hover{color:var(--cyan)}
.story-container{max-width:820px;margin:0 auto;padding:2rem 1.2rem 4rem}
.story-progress{text-align:center;font-family:'Cinzel',serif;font-size:.8rem;color:var(--ink-mute);letter-spacing:.15em;text-transform:uppercase;margin-bottom:1rem;padding-bottom:.8rem;border-bottom:1px solid var(--panel-border)}
.story-door-banner{text-align:center;margin-bottom:2rem;padding-bottom:1.5rem;border-bottom:1px solid var(--panel-border)}
.story-door-icon{font-size:3.5rem;margin-bottom:.5rem}
.story-door-name{font-family:'Cinzel',serif;font-size:clamp(1.4rem,2.8vw,1.8rem);font-weight:700;margin-bottom:.3rem}
.story-door-tech{font-size:.85rem;font-weight:600;padding:.3rem 1rem;border-radius:12px;display:inline-block}
.story-text{font-size:clamp(.95rem,1.5vw,1.1rem);line-height:2;color:var(--ink)}
.story-text p{margin-bottom:1.2rem}
.story-text .scene-setting{color:var(--ink-dim);font-style:italic;font-size:.9rem;border-left:2px solid rgba(54,214,231,.25);padding-left:1rem;margin:1.5rem 0}
.story-text .dialogue{background:rgba(240,193,75,.05);border-radius:12px;padding:1rem 1.2rem;margin:.8rem 0;border:1px solid rgba(240,193,75,.1)}
.story-text .dialogue::before{content:'➤';color:var(--gold);margin-right:.5rem;font-size:.8rem}
.story-text .verse{text-align:center;font-family:'Amiri',serif;font-size:1.1rem;color:var(--gold-bright);margin:1.5rem 0;padding:1.2rem;background:rgba(240,193,75,.04);border-radius:16px;border:1px solid var(--panel-border)}
.story-text .secret-box{background:linear-gradient(135deg,rgba(54,214,231,.08),rgba(82,196,26,.05));border:1px solid rgba(54,214,231,.3);border-radius:16px;padding:1.2rem;margin:1.5rem 0;text-align:center}
.story-text .secret-box .label{font-size:0.75rem;color:var(--cyan);letter-spacing:.15em;text-transform:uppercase;margin-bottom:.4rem;font-weight:700}
.story-text .secret-box .text{font-size:1rem;font-weight:600;color:var(--ink)}
.story-text .code-block{background:rgba(0,0,0,.4);border:1px solid rgba(54,214,231,.15);border-radius:12px;padding:1rem 1.2rem;margin:1rem 0;font-family:'Courier New',monospace;font-size:0.875rem;color:var(--cyan);overflow-x:auto;line-height:1.6;white-space:pre-wrap;overflow-wrap:break-word}
.story-text .code-block pre{margin:0;background:transparent!important;padding:0!important;white-space:pre-wrap;overflow-wrap:break-word}
.story-text .code-block code{font-family:inherit!important;font-size:inherit!important;background:transparent!important;text-shadow:none!important;white-space:pre-wrap!important}
.story-text .code-block table,.story-text .code-block th,.story-text .code-block td{white-space:normal;overflow-wrap:anywhere}
.story-text p.en,.story-text .scene-setting.en{color:var(--ink-mute);font-style:italic;font-size:.875rem;line-height:1.7;margin-top:-0.6rem;margin-bottom:1.5rem;padding-left:1rem;border-left:2px solid rgba(54,214,231,.08)}
.story-text .dialogue.en{background:rgba(240,193,75,.02);border-color:rgba(240,193,75,.06);color:var(--ink-mute);font-style:italic;font-size:.875rem;margin-top:-0.4rem}
.story-text .dialogue.en::before{content:'↳';color:var(--ink-mute)}

.recall-box{background:rgba(74,158,255,.05);border:1px solid rgba(74,158,255,.2);border-radius:16px;padding:1.2rem 1.4rem;margin:1.5rem 0}

/* ── CALLOUT ── */
.story-text .callout{display:flex;gap:.6rem;border-radius:12px;padding:.7rem .9rem;margin:.9rem 0;font-size:0.9rem;line-height:1.6}
.story-text .callout .co-icon{font-size:1.05rem;flex-shrink:0;line-height:1.5}
.story-text .callout.warn{background:rgba(240,98,146,.08);border:1px solid rgba(240,98,146,.24)}
.recall-title{font-weight:700;color:var(--moon);margin-bottom:.6rem;font-size:.85rem;letter-spacing:.05em}
.recall-q{font-size:.95rem;color:var(--ink);margin-bottom:.8rem;line-height:1.7}
.recall-q.en{font-size:0.875rem;color:var(--ink-mute);font-style:italic;margin-top:-.4rem;margin-bottom:.8rem}
.recall-toggle{font-family:'Noto Sans Bengali',sans-serif;font-size:0.85rem;color:var(--moon);background:rgba(74,158,255,.1);border:1px solid rgba(74,158,255,.25);border-radius:8px;padding:.3rem .8rem;cursor:pointer;transition:all .3s}
.recall-toggle:hover{background:rgba(74,158,255,.2)}
.recall-a{display:none;font-size:.9rem;color:var(--ink-dim);font-style:italic;padding:.7rem 0 0;border-top:1px solid rgba(74,158,255,.12);margin-top:.6rem;line-height:1.7}

.real-example-section{margin:2rem 0;padding:0;border:1px solid #2d5a3d;border-radius:14px;overflow:hidden;background:rgba(0,20,10,.3)}

.code-bridge{margin:2rem 0 0;padding:1.2rem 1.5rem;background:rgba(74,158,255,.06);border-left:3px solid rgba(74,158,255,.3);border-radius:0 12px 0 0}
.code-bridge-title{font-family:'Cinzel',serif;font-size:.8rem;color:var(--cyan);letter-spacing:.05em;margin-bottom:.8rem}
.code-bridge-row{display:flex;gap:.6rem;margin-bottom:.6rem;align-items:flex-start}
.code-bridge-row:last-child{margin-bottom:0}
.code-bridge-icon{font-size:.9rem;flex-shrink:0;margin-top:.1rem}
.code-bridge-text{font-size:.82rem;line-height:1.6;color:var(--ink-dim)}
.code-bridge-text strong{color:var(--ink);font-weight:600}
.code-bridge-text .en{display:block;font-size:.75rem;opacity:.7;margin-top:.2rem}
.real-example-header{background:linear-gradient(135deg,#1a3a2a,#0d2818);padding:.7rem 1.2rem;display:flex;align-items:center;gap:.6rem}
.real-example-header .terminal-dots{display:flex;gap:.35rem}
.real-example-header .terminal-dots span{width:10px;height:10px;border-radius:50%;display:block}
.real-example-header .terminal-dots span:nth-child(1){background:#ff5f57}
.real-example-header .terminal-dots span:nth-child(2){background:#febc2e}
.real-example-header .terminal-dots span:nth-child(3){background:#28c840}
.real-example-title{font-family:'Cinzel',serif;font-size:.8rem;color:#28c840;letter-spacing:.06em;margin-left:.3rem}
.real-example-lang{margin-left:auto;font-size:0.75rem;color:#28c84088;font-family:monospace;letter-spacing:.05em}
.real-example-body{padding:1.2rem;font-family:'Fira Code','Courier New',monospace;font-size:0.875rem;line-height:1.65;color:#a8d8b8;overflow-x:auto;white-space:pre-wrap;overflow-wrap:break-word}
.real-example-body .c-keyword{color:#c792ea}
.real-example-body .c-string{color:#c3e88d}
.real-example-body .c-comment{color:#5c6c73;font-style:italic}
.real-example-body .c-func{color:#82aaff}
.real-example-body .c-var{color:#f78c6c}
.real-example-note{padding:.5rem 1.2rem .8rem;font-size:0.75rem;color:#5c8a6e;border-top:1px solid rgba(40,200,64,.1);font-style:italic}

.continue-area{text-align:center;margin:2rem 0 1rem}
.continue-btn{font-family:'Noto Sans Bengali',sans-serif;font-size:1rem;font-weight:700;padding:.9rem 2.5rem;background:linear-gradient(135deg,var(--leaf),#389e0d);color:#fff;border:none;border-radius:50px;cursor:pointer;box-shadow:0 0 30px rgba(82,196,26,.3),0 4px 15px rgba(0,0,0,.4);transition:all .4s ease}
.continue-btn:hover{transform:translateY(-3px) scale(1.05);box-shadow:0 0 50px rgba(82,196,26,.4)}
.continue-btn:active{transform:translateY(0) scale(1.02)}

.xp-popup{position:fixed;top:50%;left:50%;transform:translate(-50%,-50%) scale(0);background:linear-gradient(135deg,var(--cyan),#1a9aaa);color:#060a18;font-family:'Cinzel',serif;font-weight:900;font-size:2rem;padding:1.5rem 3rem;border-radius:20px;box-shadow:0 0 80px rgba(54,214,231,.4),0 10px 40px rgba(0,0,0,.5);z-index:1000;pointer-events:none;text-align:center;transition:transform .5s cubic-bezier(.34,1.56,.64,1)}
.xp-popup.show{transform:translate(-50%,-50%) scale(1)}
.xp-popup .xp-amount{font-size:2.5rem;display:block}
.xp-popup .xp-label{font-size:.8rem;letter-spacing:.1em;margin-top:.3rem;display:block}

#cheat-modal{display:none;position:fixed;inset:0;background:rgba(0,0,0,.82);z-index:500;overflow-y:auto;padding:2rem 1rem}
.cheat-modal-inner{max-width:720px;margin:0 auto;background:#0d1530;border-radius:20px;padding:1.8rem;border:1px solid var(--panel-border)}
.cheat-modal-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:1.2rem}
.cheat-modal-head h3{font-family:'Cinzel',serif;color:var(--gold-bright);font-size:1.2rem}
.cheat-close{background:none;border:none;color:var(--ink-mute);font-size:1.4rem;cursor:pointer;line-height:1;padding:.2rem .4rem;border-radius:6px;transition:color .3s}
.cheat-close:hover{color:var(--ink)}
.cheat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:.8rem}
.cheat-card{background:var(--panel);border:1px solid var(--panel-border);border-radius:12px;padding:1rem;text-align:center;transition:transform .3s}
.cheat-card:hover{transform:translateY(-3px)}
.cheat-card .icon{font-size:1.8rem;margin-bottom:.4rem}
.cheat-card .name{font-size:.8rem;font-weight:700;color:var(--ink);margin-bottom:.2rem}
.cheat-card .tech{font-size:0.78rem;color:var(--cyan);margin-bottom:.5rem}
.cheat-card .secret{font-size:0.875rem;color:var(--ink);line-height:1.5;padding-top:.5rem;border-top:1px solid var(--panel-border)}
.cheat-empty{text-align:center;color:var(--ink-mute);font-size:.9rem;padding:1rem 0}

#complete-screen{display:none;flex-direction:column;align-items:center;justify-content:center;min-height:100vh;text-align:center;padding:2rem;background:radial-gradient(ellipse at center,#0d1535 0%,#060a18 70%)}
#complete-screen.active{display:flex}
.complete-crown{font-size:4rem;margin-bottom:1rem;animation:spin 6s linear infinite}
@keyframes spin{from{transform:rotate(0deg)}to{transform:rotate(360deg)}}
.complete-title{font-family:'Cinzel',serif;font-size:clamp(1.8rem,4.5vw,2.8rem);font-weight:900;background:linear-gradient(135deg,var(--gold-bright),var(--cyan),var(--gold-bright));background-size:200% auto;-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;animation:shimmer 3s linear infinite;margin-bottom:1rem}
@keyframes shimmer{to{background-position:200% center}}
.complete-text{font-size:1.1rem;color:var(--ink);max-width:600px;line-height:1.8;margin-bottom:2rem}
.complete-verse{font-family:'Amiri',serif;font-size:1.4rem;color:var(--gold-bright);margin-bottom:.5rem}
.complete-verse-trans{font-size:.95rem;color:var(--ink-dim);margin-bottom:2rem}
.cheat-section-end{max-width:800px;margin:0 auto;padding:2rem 1rem}
.cheat-section-end h3{font-family:'Cinzel',serif;text-align:center;font-size:1.5rem;color:var(--gold-bright);margin-bottom:1.5rem}

@media(max-width:600px){
  .doors-grid{grid-template-columns:1fr}
  .door-card{min-height:140px;padding:1.2rem}
  .story-container{padding:1.5rem 1rem 3rem}
  .hud-xp-wrap{max-width:none;flex:1 1 100%;order:3}
  #hud{gap:.4rem;padding:.5rem .6rem}
  .hud-btn{font-size:0.8rem;padding:.2rem .4rem}
  .hud-rank{font-size:.85rem}
  .hud-level{font-size:0.78rem;padding:.15rem .5rem}
}
@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
  .title-main{animation:none!important}
  .door-card.next-door{animation:none!important}
  .complete-crown{animation:none!important}
  .complete-title{animation:none!important}
}

/* Diagram SVGs */
.diagram{background:linear-gradient(135deg,rgba(19,26,43,.6),rgba(7,10,15,.8));border:1px solid rgba(45,212,191,.15);border-radius:14px;padding:1rem;margin:1.2rem 0;overflow:hidden}.diagram svg{display:block;width:100%;height:auto;max-width:800px;margin:0 auto;font-family:sans-serif}