/* ═══ AI Academy — Styles ═══ */
*{margin:0;padding:0;box-sizing:border-box;-webkit-tap-highlight-color:transparent}
:root{
  --bg:#0a0e27;--card:rgba(15,20,50,0.85);--card-border:rgba(139,113,255,0.15);
  --purple:#8B71FF;--cyan:#20E8FF;--gold:#FFD700;--green:#00E676;--red:#FF4D6A;
  --text:#E8E8F0;--text2:#8B9CB6;
  --font:'Inter',sans-serif;--font-title:'Unbounded',sans-serif;--font-game:'Press Start 2P',monospace;
  --radius:16px;
}
html,body{height:100%;font-family:var(--font);background:var(--bg);color:var(--text);overflow:hidden}

/* ─── Backgrounds ─── */
.bg-image{position:fixed;inset:0;z-index:0;background:url('../img/bg.png') center 50%/cover no-repeat;pointer-events:none}
.bg-overlay{position:fixed;inset:0;z-index:0;pointer-events:none;
  background:linear-gradient(-45deg,rgba(139,113,255,0.12),rgba(32,232,255,0.06),rgba(10,14,39,0),rgba(255,215,0,0.04),rgba(139,113,255,0.08));
  background-size:400% 400%;animation:gradientShift 20s ease infinite}
@keyframes gradientShift{0%{background-position:0% 50%}50%{background-position:100% 50%}100%{background-position:0% 50%}}

/* ─── Comets ─── */
.comet{position:fixed;height:2px;pointer-events:none;z-index:0;opacity:0;
  border-radius:2px;filter:blur(0.5px)}
.c1{width:180px;top:12%;left:-200px;
  background:linear-gradient(90deg,transparent,rgba(139,113,255,0.9),rgba(32,232,255,0.5),transparent);
  animation:cometFly 9s ease-in 0.5s infinite}
.c2{width:240px;top:40%;left:-260px;
  background:linear-gradient(90deg,transparent,rgba(32,232,255,0.8),rgba(139,113,255,0.4),transparent);
  animation:cometFly 13s ease-in 5s infinite}
.c3{width:150px;top:68%;left:-170px;
  background:linear-gradient(90deg,transparent,rgba(255,215,0,0.6),rgba(139,113,255,0.5),transparent);
  animation:cometFly 10s ease-in 10s infinite}
@keyframes cometFly{
  0%{transform:translate(0,0) rotate(22deg);opacity:0}
  6%{opacity:1}
  75%{opacity:0.6}
  100%{transform:translate(140vw,55vw) rotate(22deg);opacity:0}
}

#bgCanvas{position:fixed;inset:0;z-index:0;pointer-events:none;opacity:0.7}
#app{position:relative;z-index:1;height:100%;display:flex;flex-direction:column}

/* ─── Topbar ─── */
.topbar{display:flex;align-items:center;justify-content:space-between;padding:12px 16px;
  background:rgba(10,14,39,0.9);backdrop-filter:blur(12px);border-bottom:1px solid var(--card-border);z-index:10}
.topbar__logo{font-family:var(--font-title);font-size:18px;font-weight:800;
  background:linear-gradient(135deg,var(--purple),var(--cyan));-webkit-background-clip:text;-webkit-text-fill-color:transparent}
.topbar__stats{display:flex;gap:12px;font-size:12px;font-weight:600}
.stat{padding:4px 10px;background:rgba(255,255,255,0.06);border-radius:20px}

/* ─── Main ─── */
.main{flex:1;overflow-y:auto;overflow-x:hidden;padding-bottom:72px;scroll-behavior:smooth}
.screen{display:none;padding:20px 16px}
.screen--active{display:block}

/* ─── Bottom Nav ─── */
.bnav{position:fixed;bottom:0;left:0;right:0;display:flex;background:rgba(10,14,39,0.95);
  backdrop-filter:blur(12px);border-top:1px solid var(--card-border);z-index:10;
  padding:8px 0 max(8px,env(safe-area-inset-bottom))}
.bnav__btn{flex:1;display:flex;flex-direction:column;align-items:center;gap:2px;
  background:none;border:none;color:var(--text2);font-size:10px;cursor:pointer;padding:6px;font-family:var(--font)}
.bnav__btn--active{color:var(--gold)}
.bnav__btn span{font-size:10px}

/* ─── Map Screen ─── */
.map-title{text-align:center;margin:20px 0 8px;font-family:var(--font-title);font-size:24px;font-weight:800;
  background:linear-gradient(135deg,var(--purple),var(--cyan),var(--gold));-webkit-background-clip:text;-webkit-text-fill-color:transparent}
.map-subtitle{text-align:center;color:var(--text2);font-size:13px;margin-bottom:24px}

.worlds{display:flex;flex-direction:column;gap:16px;max-width:500px;margin:0 auto}

/* World Card */
.world-card{position:relative;padding:20px;border-radius:var(--radius);
  background:rgba(15,20,50,0.8);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);
  border:1px solid rgba(139,113,255,0.25);cursor:pointer;
  transition:transform 0.25s,box-shadow 0.25s;overflow:hidden}
.world-card:hover{transform:translateY(-4px);box-shadow:0 10px 40px var(--world-glow,rgba(139,113,255,0.35))}
.world-card:active{transform:scale(0.98)}
.world-card--locked{opacity:0.4;pointer-events:none;filter:grayscale(0.5)}
.world-card--current{border-color:var(--purple);box-shadow:0 0 20px rgba(139,113,255,0.3)}
.world-card--done{border-color:var(--green)}
.world-card__free{position:absolute;top:10px;right:10px;font-size:9px;font-family:var(--font-game);
  color:var(--green);background:rgba(0,230,118,0.1);padding:3px 8px;border-radius:8px}
.world-card__inner{display:flex;align-items:center;gap:16px}
.world-card__icon{width:56px;height:56px;border-radius:14px;display:flex;align-items:center;
  justify-content:center;font-size:28px;flex-shrink:0;
  animation:iconPulse 4s ease-in-out infinite}
.world-card--locked .world-card__icon{animation:none}
@keyframes iconPulse{
  0%,100%{transform:scale(1) rotate(0deg)}
  30%{transform:scale(1.1) rotate(4deg)}
  70%{transform:scale(1.06) rotate(-3deg)}
}
.world-card__info{flex:1}
.world-card__name{font-family:var(--font-title);font-size:16px;font-weight:700;margin-bottom:4px}
.world-card__desc{font-size:12px;color:var(--text2);margin-bottom:8px}
.world-card__progress{height:6px;background:rgba(255,255,255,0.08);border-radius:3px;overflow:hidden}
.world-card__fill{height:100%;border-radius:3px;transition:width 0.5s ease}
.world-card__count{font-size:11px;color:var(--text2);margin-top:4px}
.world-card__lock{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;
  font-size:32px;background:rgba(0,0,0,0.3);border-radius:var(--radius)}

/* ─── World Screen (lessons list) ─── */
.world-header{display:flex;align-items:center;gap:12px;margin-bottom:20px}
.world-back{background:none;border:none;color:var(--text);font-size:24px;cursor:pointer;padding:4px}
.world-name{font-family:var(--font-title);font-size:20px;font-weight:700}

.lessons-path{display:flex;flex-direction:column;align-items:center;gap:0;max-width:400px;margin:0 auto}
.lesson-connector{width:2px;height:24px;background:rgba(139,113,255,0.2)}
.lesson-connector--done{background:var(--green)}

.lesson-node{width:64px;height:64px;border-radius:50%;display:flex;align-items:center;justify-content:center;
  font-family:var(--font-title);font-size:16px;font-weight:700;cursor:pointer;
  background:var(--card);border:2px solid var(--card-border);transition:all 0.2s;position:relative}
.lesson-node:hover{transform:scale(1.1)}
.lesson-node--done{background:var(--green);border-color:var(--green);color:#0a0a0a}
.lesson-node--current{border-color:var(--purple);box-shadow:0 0 20px rgba(139,113,255,0.4);animation:pulse 2s infinite}
.lesson-node--locked{opacity:0.3;pointer-events:none}
.lesson-node--boss{background:linear-gradient(135deg,#FF4D6A,#d63031);border-color:#FF4D6A;
  width:72px;height:72px;font-size:20px}
.lesson-node__title{position:absolute;top:72px;white-space:nowrap;font-size:10px;color:var(--text2);
  font-family:var(--font);font-weight:400;max-width:120px;text-align:center;overflow:hidden;text-overflow:ellipsis}

@keyframes pulse{0%,100%{box-shadow:0 0 20px rgba(139,113,255,0.4)}50%{box-shadow:0 0 40px rgba(139,113,255,0.7)}}

/* ─── Lesson Screen ─── */
.lesson-header{display:flex;align-items:center;gap:12px;margin-bottom:20px}
.lesson-back{background:none;border:none;color:var(--text);font-size:24px;cursor:pointer}
.lesson-title{font-family:var(--font-title);font-size:18px;font-weight:700;flex:1}
.lesson-xp{font-family:var(--font-game);font-size:10px;color:var(--gold)}

.lesson-blocks{max-width:600px;margin:0 auto;display:flex;flex-direction:column;gap:20px}

/* Theory block */
.block-theory{background:var(--card);border:1px solid var(--card-border);border-radius:var(--radius);padding:20px;
  animation:fadeIn 0.5s ease both}
.block-theory h3{font-family:var(--font-title);font-size:16px;margin-bottom:12px;
  background:linear-gradient(135deg,var(--purple),var(--cyan));-webkit-background-clip:text;-webkit-text-fill-color:transparent}
.block-theory p{font-size:14px;line-height:1.7;color:rgba(255,255,255,0.85);margin-bottom:10px}
.block-theory strong{
  background:linear-gradient(135deg,var(--cyan),var(--purple));
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;
  background-clip:text;font-weight:700}

/* Fact block */
.block-fact{background:linear-gradient(135deg,rgba(255,215,0,0.08),rgba(255,215,0,0.02));
  border:1px solid rgba(255,215,0,0.2);border-radius:var(--radius);padding:16px;display:flex;gap:12px;align-items:flex-start}
.block-fact__icon{font-size:24px;flex-shrink:0;animation:bulbBlink 2.5s ease-in-out infinite}
@keyframes bulbBlink{
  0%,85%,100%{filter:drop-shadow(0 0 8px rgba(255,215,0,0.9));opacity:1}
  92%{filter:drop-shadow(0 0 0px transparent);opacity:0.5}
}
.block-fact__text{font-size:13px;line-height:1.6;color:var(--gold)}

/* Quiz block */
.block-quiz{background:var(--card);border:1px solid var(--card-border);border-radius:var(--radius);padding:20px}
.block-quiz__q{font-size:15px;font-weight:600;margin-bottom:16px}
.block-quiz__opts{display:flex;flex-direction:column;gap:10px}
.quiz-opt{padding:14px 16px;background:rgba(255,255,255,0.04);border:2px solid transparent;
  border-radius:12px;font-size:14px;cursor:pointer;transition:all 0.2s;text-align:left}
.quiz-opt:hover{background:rgba(139,113,255,0.08);border-color:rgba(139,113,255,0.3)}
.quiz-opt--correct{border-color:var(--green)!important;background:rgba(0,230,118,0.1)!important;animation:bounce 0.4s}
.quiz-opt--wrong{border-color:var(--red)!important;background:rgba(255,77,106,0.1)!important;animation:shake 0.4s}
.quiz-opt--disabled{pointer-events:none;opacity:0.6}
.quiz-explain{margin-top:12px;padding:12px;border-radius:10px;font-size:13px;line-height:1.5;display:none}
.quiz-explain--show{display:block}
.quiz-explain--correct{background:rgba(0,230,118,0.08);color:var(--green)}
.quiz-explain--wrong{background:rgba(255,77,106,0.08);color:#fab1a0}

/* Practice block */
.block-practice{background:linear-gradient(135deg,rgba(139,113,255,0.08),rgba(32,232,255,0.05));
  border:1px solid rgba(139,113,255,0.2);border-radius:var(--radius);padding:20px}
.block-practice__title{font-family:var(--font-title);font-size:14px;color:var(--gold);margin-bottom:12px}
.block-practice__steps{list-style:none;counter-reset:step}
.block-practice__steps li{counter-increment:step;padding:8px 0 8px 36px;position:relative;
  font-size:13px;color:rgba(255,255,255,0.75);line-height:1.5}
.block-practice__steps li::before{content:counter(step);position:absolute;left:0;top:6px;
  width:24px;height:24px;border-radius:50%;background:var(--purple);color:#fff;font-size:11px;
  font-weight:700;display:flex;align-items:center;justify-content:center}

/* Complete button */
.btn-complete{width:100%;padding:16px;border:none;border-radius:var(--radius);
  background:linear-gradient(135deg,var(--purple),var(--cyan));color:#fff;
  font-family:var(--font-title);font-size:15px;font-weight:700;cursor:pointer;
  transition:transform 0.15s;margin-top:10px}
.btn-complete:hover{transform:translateY(-2px)}
.btn-complete:active{transform:scale(0.97)}
.btn-complete:disabled{opacity:0.4;cursor:not-allowed}

/* ─── Boss Battle ─── */
.boss{text-align:center;padding:20px}
.boss__title{font-family:var(--font-title);font-size:22px;color:var(--red);margin-bottom:8px}
.boss__subtitle{color:var(--text2);font-size:13px;margin-bottom:24px}
.boss__arena{max-width:400px;margin:0 auto}
.boss__icon{font-size:64px;margin-bottom:16px;animation:float 3s ease-in-out infinite}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-10px)}}
.hp-bar{height:20px;background:rgba(255,255,255,0.08);border-radius:10px;overflow:hidden;margin-bottom:8px;position:relative}
.hp-bar__fill{height:100%;border-radius:10px;transition:width 0.5s ease}
.hp-bar__fill--boss{background:linear-gradient(90deg,var(--red),#ff6b6b)}
.hp-bar__fill--player{background:linear-gradient(90deg,var(--green),#66ff66)}
.hp-bar__label{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;
  font-family:var(--font-game);font-size:8px;color:#fff;text-shadow:1px 1px 2px rgba(0,0,0,0.5)}
.boss__question{background:var(--card);border:1px solid var(--card-border);border-radius:var(--radius);
  padding:20px;margin:20px 0}
.boss__timer{font-family:var(--font-game);font-size:14px;color:var(--gold);margin-bottom:12px}
.boss__timer--danger{color:var(--red);animation:pulse 0.5s infinite}

/* Boss screen shake */
@keyframes bodyShake{
  0%,100%{transform:translate(0,0) rotate(0deg)}
  10%{transform:translate(-8px,3px) rotate(-0.5deg)}
  25%{transform:translate(8px,-4px) rotate(0.5deg)}
  40%{transform:translate(-6px,5px) rotate(-0.3deg)}
  55%{transform:translate(6px,-3px) rotate(0.3deg)}
  70%{transform:translate(-3px,2px) rotate(-0.2deg)}
  85%{transform:translate(3px,-2px) rotate(0.2deg)}
}
body.shake{animation:bodyShake 0.45s ease}

/* Floating damage text */
@keyframes floatUp{
  0%{transform:translateY(0) scale(1);opacity:1}
  40%{transform:translateY(-30px) scale(1.3);opacity:0.9}
  100%{transform:translateY(-80px) scale(0.7);opacity:0}
}
.damage-float{
  position:fixed;pointer-events:none;z-index:200;
  font-family:var(--font-game);font-size:16px;font-weight:700;
  text-shadow:0 2px 10px rgba(0,0,0,0.7);
  animation:floatUp 0.9s ease forwards;
  white-space:nowrap
}

/* XP Popup */
.xp-popup{position:fixed;top:50%;left:50%;transform:translate(-50%,-50%) scale(0);
  background:var(--card);border:2px solid var(--gold);border-radius:24px;padding:40px;text-align:center;
  z-index:100;transition:transform 0.3s cubic-bezier(0.34,1.56,0.64,1)}
.xp-popup--show{transform:translate(-50%,-50%) scale(1)}
.xp-popup__emoji{font-size:56px;margin-bottom:12px}
.xp-popup__title{font-family:var(--font-title);font-size:20px;color:var(--gold);margin-bottom:8px}
.xp-popup__xp{font-family:var(--font-game);font-size:24px;color:var(--cyan);margin-bottom:16px}
.xp-popup__btn{padding:12px 32px;border:none;border-radius:12px;background:var(--gold);color:#0a0a0a;
  font-family:var(--font-title);font-weight:700;cursor:pointer}
.xp-overlay{position:fixed;inset:0;background:rgba(0,0,0,0.6);z-index:99;display:none}
.xp-overlay--show{display:block}

/* ─── Profile ─── */
.profile{text-align:center;padding:30px 0}
.profile__avatar{width:80px;height:80px;border-radius:50%;margin:0 auto 12px;
  background:linear-gradient(135deg,var(--purple),var(--cyan));display:flex;align-items:center;
  justify-content:center;font-size:32px;font-weight:700;font-family:var(--font-title)}
.profile__name{font-family:var(--font-title);font-size:20px;font-weight:700;margin-bottom:4px}
.profile__level{font-size:13px;color:var(--text2);margin-bottom:20px}
.profile__stats{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-bottom:24px}
.profile__stat{background:var(--card);border:1px solid var(--card-border);border-radius:var(--radius);padding:16px}
.profile__stat-val{font-family:var(--font-title);font-size:20px;font-weight:700;color:var(--gold)}
.profile__stat-label{font-size:11px;color:var(--text2);margin-top:4px}
.badges{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.badge{background:var(--card);border:1px solid var(--card-border);border-radius:var(--radius);padding:14px;text-align:center}
.badge--locked{opacity:0.25}
.badge__icon{font-size:28px;margin-bottom:6px}
.badge__name{font-size:10px;color:var(--text2)}

/* ─── Paywall ─── */
.paywall{text-align:center;padding:40px 20px}
.paywall__emoji{font-size:48px;margin-bottom:16px}
.paywall__title{font-family:var(--font-title);font-size:20px;margin-bottom:8px}
.paywall__text{color:var(--text2);font-size:14px;margin-bottom:20px}
.paywall__price{font-family:var(--font-title);font-size:28px;color:var(--gold);margin-bottom:4px}
.paywall__period{font-size:12px;color:var(--text2);margin-bottom:20px}
.paywall__btn{padding:14px 32px;border:none;border-radius:var(--radius);background:var(--gold);
  color:#0a0a0a;font-family:var(--font-title);font-weight:700;font-size:15px;cursor:pointer}

/* ─── Animations ─── */
@keyframes bounce{0%{transform:scale(1)}50%{transform:scale(1.05)}100%{transform:scale(1)}}
@keyframes shake{0%,100%{transform:translateX(0)}25%{transform:translateX(-6px)}75%{transform:translateX(6px)}}
@keyframes fadeIn{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:translateY(0)}}
.fade-in{animation:fadeIn 0.4s ease both}

/* ─── Drag-Drop block ─── */
.block-dragdrop{background:var(--card);border:1px solid var(--card-border);border-radius:var(--radius);padding:20px}
.block-dragdrop__q{font-size:15px;font-weight:600;margin-bottom:14px}
.block-dragdrop__items{display:flex;flex-wrap:wrap;gap:8px;min-height:52px;padding:10px;
  background:rgba(255,255,255,0.025);border-radius:12px;border:2px dashed rgba(139,113,255,0.25);margin-bottom:14px;
  transition:border-color 0.2s,background 0.2s}
.drag-item{padding:9px 16px;background:linear-gradient(135deg,rgba(139,113,255,0.18),rgba(32,232,255,0.1));
  border:2px solid rgba(139,113,255,0.4);border-radius:10px;font-size:13px;font-weight:600;
  cursor:grab;user-select:none;touch-action:none;transition:all 0.2s}
.drag-item:active,.drag-item:hover{transform:scale(1.04);box-shadow:0 4px 16px rgba(139,113,255,0.35)}
.drag-item--dragging{opacity:0.35;transform:scale(0.95)!important}
.drag-item--correct{border-color:var(--green)!important;background:rgba(0,230,118,0.15)!important;cursor:default}
.drag-item--wrong{border-color:var(--red)!important;background:rgba(255,77,106,0.15)!important;animation:shake 0.4s;cursor:default}
.block-dragdrop__zones{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:14px}
.drop-zone{flex:1;min-width:130px;border-radius:12px;padding:10px;
  border:2px dashed rgba(255,255,255,0.12);background:rgba(255,255,255,0.02);transition:all 0.2s}
.drop-zone__label{font-size:11px;font-weight:700;color:var(--text2);margin-bottom:8px;
  text-transform:uppercase;letter-spacing:0.6px}
.drop-zone__items{display:flex;flex-wrap:wrap;gap:6px;min-height:44px}
.drop-zone--over{border-color:var(--purple)!important;background:rgba(139,113,255,0.08)!important}
.dragdrop-check{padding:10px 22px;border:none;border-radius:10px;
  background:linear-gradient(135deg,var(--purple),var(--cyan));color:#fff;
  font-family:var(--font-title);font-size:13px;font-weight:700;cursor:pointer;
  transition:all 0.2s;margin-bottom:4px}
.dragdrop-check:hover{transform:translateY(-2px);box-shadow:0 4px 16px rgba(139,113,255,0.4)}
.dragdrop-check:disabled{opacity:0.5;cursor:not-allowed;transform:none}

/* ─── Matching block ─── */
.block-matching{background:var(--card);border:1px solid var(--card-border);border-radius:var(--radius);padding:20px}
.block-matching__q{font-size:15px;font-weight:600;margin-bottom:14px}
.matching-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-bottom:10px}
.match-item{padding:12px 10px;background:rgba(255,255,255,0.04);border:2px solid transparent;
  border-radius:10px;font-size:13px;cursor:pointer;transition:all 0.2s;text-align:center;line-height:1.4}
.match-item:hover{background:rgba(139,113,255,0.08);border-color:rgba(139,113,255,0.3)}
.match-item--selected{border-color:var(--cyan)!important;background:rgba(32,232,255,0.1)!important;
  box-shadow:0 0 12px rgba(32,232,255,0.25);animation:bounce 0.3s}
.match-item--correct{border-color:var(--green)!important;background:rgba(0,230,118,0.12)!important;
  pointer-events:none;animation:bounce 0.4s}
.match-item--wrong{border-color:var(--red)!important;background:rgba(255,77,106,0.12)!important;animation:shake 0.4s}
.match-item--disabled{pointer-events:none;opacity:0.55}
.matching-hint{font-size:12px;color:var(--text2);text-align:center;margin-bottom:4px}

/* ─── Fill-Blank block ─── */
.block-fillblank{background:var(--card);border:1px solid var(--card-border);border-radius:var(--radius);padding:20px}
.block-fillblank__q{font-size:15px;font-weight:600;margin-bottom:14px}
.fillblank-text{font-size:15px;line-height:2.4;color:rgba(255,255,255,0.88)}
.blank{display:inline-block;min-width:72px;border-bottom:2px solid var(--purple);padding:2px 10px;
  margin:0 3px;cursor:pointer;color:var(--cyan);font-weight:700;border-radius:6px;
  transition:all 0.2s;position:relative;text-align:center;vertical-align:middle}
.blank:hover{background:rgba(139,113,255,0.12)}
.blank--active{background:rgba(139,113,255,0.16);border-color:var(--cyan);
  box-shadow:0 0 10px rgba(32,232,255,0.2)}
.blank--correct{border-color:var(--green)!important;color:var(--green)!important;
  background:rgba(0,230,118,0.1);cursor:default;animation:bounce 0.3s}
.blank--wrong{border-color:var(--red)!important;color:var(--red)!important;animation:shake 0.4s}
.blank-choices{position:absolute;top:calc(100% + 8px);left:50%;transform:translateX(-50%);
  background:rgba(12,16,44,0.97);border:1px solid var(--card-border);border-radius:12px;
  padding:6px;display:flex;flex-direction:column;gap:4px;z-index:50;min-width:140px;
  box-shadow:0 10px 32px rgba(0,0,0,0.5);animation:fadeIn 0.15s ease}
.blank-choice{padding:9px 16px;border-radius:8px;font-size:13px;font-weight:600;
  cursor:pointer;text-align:center;transition:all 0.15s;color:var(--text);white-space:nowrap}
.blank-choice:hover{background:rgba(139,113,255,0.22);color:var(--cyan);transform:scale(1.02)}

/* ─── True-False block ─── */
.block-truefalse{background:var(--card);border:1px solid var(--card-border);border-radius:var(--radius);padding:20px}
.block-truefalse__q{font-size:15px;font-weight:600;line-height:1.55;margin-bottom:20px}
.truefalse-btns{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-bottom:4px}
.tf-btn{padding:18px 12px;border:2px solid transparent;border-radius:14px;
  font-family:var(--font-title);font-size:14px;font-weight:700;cursor:pointer;
  transition:all 0.2s;position:relative;overflow:hidden;background:none}
.tf-btn--true{background:rgba(0,230,118,0.07);border-color:rgba(0,230,118,0.28);color:var(--green)}
.tf-btn--false{background:rgba(255,77,106,0.07);border-color:rgba(255,77,106,0.28);color:var(--red)}
.tf-btn:hover:not(.tf-btn--disabled){transform:translateY(-3px);box-shadow:0 6px 20px rgba(0,0,0,0.3)}
.tf-btn:active:not(.tf-btn--disabled){transform:scale(0.96)}
.tf-btn--correct{animation:tfPop 0.45s ease;box-shadow:0 0 20px rgba(0,230,118,0.3)!important}
.tf-btn--true.tf-btn--correct{border-color:var(--green)!important;background:rgba(0,230,118,0.18)!important}
.tf-btn--false.tf-btn--correct{border-color:var(--green)!important;background:rgba(0,230,118,0.18)!important;color:var(--green)!important}
.tf-btn--wrong{animation:shake 0.4s;opacity:0.5}
.tf-btn--disabled{pointer-events:none}
@keyframes tfPop{0%{transform:scale(1)}40%{transform:scale(1.07)}100%{transform:scale(1)}}
.tf-result{margin-top:12px;padding:12px;border-radius:10px;font-size:13px;line-height:1.5;display:none;text-align:center}
.tf-result--show{display:block;animation:fadeIn 0.3s ease}
.tf-result--correct{background:rgba(0,230,118,0.08);color:var(--green)}
.tf-result--wrong{background:rgba(255,77,106,0.08);color:#fab1a0}

/* ─── Responsive ─── */
@media(min-width:768px){
  .worlds{max-width:600px}
  .lesson-blocks{max-width:700px}
  .topbar{padding:12px 32px}
}