/* ═══════════ بوز آکادمی — design system (RTL, tablet-first, dark) ═══════════ */
@font-face{font-family:'Vazirmatn';src:url('fonts/Vazirmatn-Regular.woff2') format('woff2');font-weight:400;font-display:swap}
@font-face{font-family:'Vazirmatn';src:url('fonts/Vazirmatn-Bold.woff2') format('woff2');font-weight:700;font-display:swap}
@font-face{font-family:'Vazirmatn';src:url('fonts/Vazirmatn-Black.woff2') format('woff2');font-weight:900;font-display:swap}

:root{
  --bg:#0b0d12; --bg2:#12151d; --card:#171b25; --card2:#1e2432;
  --line:#2a3142; --txt:#eef1f7; --mut:#8b93a7;
  --green:#4ade80; --green-d:#22a35a; --green-glow:rgba(74,222,128,.25);
  --gold:#fbbf24; --red:#f87171; --purple:#a78bfa; --blue:#38bdf8;
  --r:20px; --shadow:0 10px 30px rgba(0,0,0,.45);
}
*{margin:0;padding:0;box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{height:100%}
body{
  font-family:'Vazirmatn',-apple-system,'Segoe UI',Tahoma,sans-serif;
  background:var(--bg); color:var(--txt); overflow-x:hidden;
  min-height:100dvh;
}
.hidden{display:none!important}
.code,code,.mono{font-family:'Vazirmatn',ui-monospace,Consolas,monospace;direction:ltr;display:inline-block}

/* ── background glows ── */
.bg-glow{position:fixed;border-radius:50%;filter:blur(90px);opacity:.14;pointer-events:none;z-index:0}
.bg-glow-1{width:420px;height:420px;background:var(--green);top:-120px;left:-120px;animation:drift 16s ease-in-out infinite alternate}
.bg-glow-2{width:380px;height:380px;background:var(--purple);bottom:-100px;right:-100px;animation:drift 20s ease-in-out infinite alternate-reverse}
@keyframes drift{to{transform:translate(40px,30px) scale(1.08)}}

/* ── screens ── */
.screen{position:relative;z-index:1;max-width:780px;margin:0 auto;min-height:100dvh;display:flex;flex-direction:column;padding:env(safe-area-inset-top) 18px calc(18px + env(safe-area-inset-bottom))}

/* ── buttons ── */
.btn{border:0;cursor:pointer;font-family:inherit;font-weight:900;border-radius:16px;transition:transform .12s,box-shadow .12s,filter .12s;user-select:none}
.btn:active{transform:translateY(3px)}
.btn:disabled{opacity:.45;cursor:default;filter:grayscale(.4)}
.btn-primary{background:linear-gradient(180deg,#53e88b,#2fbf67);color:#052e16;font-size:19px;padding:16px 28px;box-shadow:0 6px 0 #1a7a43,0 14px 28px rgba(74,222,128,.25)}
.btn-primary:not(:disabled):hover{filter:brightness(1.06)}
.btn-primary:active{box-shadow:0 2px 0 #1a7a43}
.btn-xl{width:100%;min-height:60px;font-size:20px}
.btn-ghost{background:var(--card);color:var(--mut);border:1px solid var(--line);padding:13px 20px;font-size:15px;font-weight:700}
.btn-ghost:hover{color:var(--txt);border-color:var(--green)}
.icon-btn{background:var(--card);border:1px solid var(--line);color:var(--mut);width:48px;height:48px;border-radius:14px;font-size:19px;cursor:pointer;font-weight:900}
.icon-btn:hover{color:var(--txt)}

/* ── floating sound toggle ── */
.sound-btn{position:fixed;left:16px;bottom:calc(16px + env(safe-area-inset-bottom));z-index:70;width:54px;height:54px;border-radius:50%;background:var(--card);border:1.5px solid var(--line);color:var(--txt);font-size:22px;cursor:pointer;box-shadow:var(--shadow);transition:transform .15s,border-color .15s;user-select:none}
.sound-btn:hover{border-color:var(--green);transform:scale(1.08)}
.sound-btn:active{transform:scale(.92)}
.sound-btn.muted{opacity:.55}

/* ═══════════ INTRO ═══════════ */
#screen-intro{justify-content:center;align-items:center;text-align:center;gap:8px}
.intro-title{font-size:52px;font-weight:900;letter-spacing:-.5px;margin-top:6px}
.grad{background:linear-gradient(90deg,var(--green),var(--gold));-webkit-background-clip:text;background-clip:text;color:transparent}
.intro-sub{color:var(--mut);font-size:19px;font-weight:700;margin-bottom:22px}
.intro-cards{display:flex;flex-direction:column;gap:12px;width:100%;max-width:460px;margin-bottom:28px}
.intro-card{display:flex;align-items:center;gap:14px;background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:16px 18px;font-size:15.5px;font-weight:700;text-align:right;animation:pop .5s both}
.intro-card:nth-child(2){animation-delay:.12s}.intro-card:nth-child(3){animation-delay:.24s}
.intro-card .ic{font-size:26px}
.intro-hint{color:var(--mut);font-size:13.5px;margin-top:14px;font-weight:700}
.intro-wrap{width:100%;max-width:520px;display:flex;flex-direction:column;align-items:center}

/* ── mascot ── */
.mascot-xl,.mascot-sm,.result-mascot{display:inline-block;filter:drop-shadow(0 12px 24px rgba(74,222,128,.3));animation:float 3.4s ease-in-out infinite}
.mascot-xl svg,.result-mascot svg{width:150px;height:150px}
.mascot-sm svg{width:78px;height:78px}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-9px)}}
.mascot-happy{animation:jump .5s ease}
@keyframes jump{0%{transform:scale(1)}40%{transform:scale(1.15) rotate(-4deg)}100%{transform:scale(1)}}
.mascot-sad{animation:shake .45s ease}
@keyframes shake{0%,100%{transform:translateX(0)}25%{transform:translateX(-7px)}50%{transform:translateX(7px)}75%{transform:translateX(-4px)}}

/* ═══════════ HOME ═══════════ */
.topbar{display:flex;align-items:center;gap:10px;padding:14px 2px 6px;position:sticky;top:0;z-index:5;background:linear-gradient(180deg,var(--bg) 75%,transparent)}
.stat-chip{display:flex;align-items:center;gap:6px;background:var(--card);border:1px solid var(--line);padding:8px 14px;border-radius:999px;font-weight:900;font-size:16px}
.stat-chip .fire{animation:flicker 1.6s infinite}
@keyframes flicker{0%,100%{transform:scale(1) rotate(-3deg)}50%{transform:scale(1.14) rotate(3deg)}}
.lvl-chip{margin-inline-start:auto;background:linear-gradient(90deg,rgba(251,191,36,.16),rgba(74,222,128,.16));border:1px solid rgba(251,191,36,.4);color:var(--gold);padding:8px 16px;border-radius:999px;font-weight:900;font-size:14.5px}
.hero{display:flex;align-items:center;gap:16px;padding:14px 4px 4px}
.hero-title{font-size:27px;font-weight:900}
.hero-sub{color:var(--mut);font-size:14.5px;font-weight:700}

/* ── winding path ── */
.path{display:flex;flex-direction:column;align-items:center;gap:0;padding:18px 0 30px;flex:1}
.node-row{display:flex;width:100%;justify-content:center;position:relative;padding:17px 0}
.node-row:nth-child(odd){transform:translateX(-46px)}
.node-row:nth-child(even){transform:translateX(46px)}
@media(max-width:560px){.node-row:nth-child(odd){transform:translateX(-30px)}.node-row:nth-child(even){transform:translateX(30px)}}
.node{position:relative;width:84px;height:84px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:38px;cursor:pointer;border:0;transition:transform .15s;font-family:inherit}
.node:hover{transform:scale(1.07)}
.node::before{content:'';position:absolute;inset:-9px;border-radius:50%;z-index:-1}
.node-done{background:linear-gradient(180deg,#53e88b,#2fbf67);box-shadow:0 7px 0 #1a7a43,0 16px 30px rgba(74,222,128,.3)}
.node-current{background:linear-gradient(180deg,#ffd76a,#f0a819);box-shadow:0 7px 0 #a16207,0 16px 30px rgba(251,191,36,.35);animation:pulse 1.8s infinite}
.node-locked{background:var(--card2);box-shadow:0 7px 0 #0d1017;border:2px solid var(--line);filter:grayscale(.65);opacity:.75}
@keyframes pulse{0%,100%{box-shadow:0 7px 0 #a16207,0 0 0 0 rgba(251,191,36,.45)}50%{box-shadow:0 7px 0 #a16207,0 0 0 18px rgba(251,191,36,0)}}
.node-crown{position:absolute;top:-16px;right:-8px;font-size:26px;transform:rotate(18deg);filter:drop-shadow(0 4px 6px rgba(0,0,0,.4))}
.node-idx{position:absolute;bottom:-9px;left:50%;transform:translateX(-50%);background:var(--bg2);border:1px solid var(--line);color:var(--mut);font-size:11.5px;font-weight:900;padding:2px 10px;border-radius:999px;white-space:nowrap}
.node-row::after{content:'';position:absolute;top:50%;height:2.5px;width:74px;background:repeating-linear-gradient(90deg,var(--line) 0 9px,transparent 9px 17px);z-index:-2}
.node-row:first-child::after{display:none}
.node-row:nth-child(odd)::after{left:calc(50% + 40px)}
.node-row:nth-child(even)::after{right:calc(50% + 40px)}
.home-footer{display:flex;gap:12px;justify-content:center;padding:10px 0 16px;flex-wrap:wrap}

/* ═══════════ SHEETS ═══════════ */
.sheet-backdrop{position:fixed;inset:0;background:rgba(4,6,10,.72);backdrop-filter:blur(6px);z-index:40;display:flex;align-items:flex-end;justify-content:center;animation:fade .2s}
@keyframes fade{from{opacity:0}}
.sheet{background:var(--bg2);border:1px solid var(--line);border-bottom:0;border-radius:26px 26px 0 0;width:100%;max-width:560px;max-height:86dvh;overflow-y:auto;padding:26px 24px calc(26px + env(safe-area-inset-bottom));position:relative;animation:rise .28s cubic-bezier(.2,.9,.3,1.2)}
@keyframes rise{from{transform:translateY(60px);opacity:0}}
.sheet-close{position:absolute;top:16px;left:16px;background:var(--card);border:1px solid var(--line);color:var(--mut);width:42px;height:42px;border-radius:12px;font-size:17px;cursor:pointer;font-weight:900}
.sheet-icon{font-size:44px;margin-bottom:6px}
.sheet h3{font-size:24px;font-weight:900;margin-bottom:8px}
.sheet>p{color:var(--mut);font-size:15px;line-height:1.9;font-weight:700}
.us-progress{display:flex;align-items:center;gap:12px;margin:14px 0 18px}
.us-bar{flex:1;height:10px;background:var(--card);border-radius:99px;overflow:hidden}
.us-bar i{display:block;height:100%;background:linear-gradient(90deg,var(--green),var(--gold));border-radius:99px;transition:width .5s}
.us-progress span{font-size:13px;font-weight:900;color:var(--mut);white-space:nowrap}
.lesson-list{display:flex;flex-direction:column;gap:10px}
.lesson-row{display:flex;align-items:center;gap:14px;background:var(--card);border:1.5px solid var(--line);border-radius:18px;padding:15px 16px;cursor:pointer;transition:border .15s,transform .12s;font-family:inherit;text-align:right;color:var(--txt);width:100%}
.lesson-row:not(:disabled):hover{border-color:var(--green);transform:translateY(-1px)}
.lesson-row:disabled{opacity:.45;cursor:default}
.lesson-ic{font-size:26px;width:40px;text-align:center}
.lesson-name{flex:1;font-weight:900;font-size:15.5px}
.lesson-sub{display:block;color:var(--mut);font-size:12.5px;font-weight:700;margin-top:2px}
.lesson-state{font-size:20px}
.about-p{margin-bottom:12px}
.about-small{font-size:12.5px;opacity:.6}

/* ═══════════ LESSON ═══════════ */
#screen-lesson{padding-top:0}
.lesson-top{display:flex;align-items:center;gap:14px;padding:14px 0 10px;position:sticky;top:0;background:var(--bg);z-index:5}
.progress-track{flex:1;height:14px;background:var(--card);border-radius:99px;overflow:hidden}
.progress-fill{height:100%;width:0%;background:linear-gradient(90deg,var(--green),var(--gold));border-radius:99px;transition:width .45s cubic-bezier(.2,.8,.3,1.1)}
.hearts{font-size:19px;font-weight:900;white-space:nowrap;letter-spacing:1px}
.lesson-body{position:relative;flex:1;display:flex;flex-direction:column;justify-content:center;gap:18px;padding:12px 2px 14px;max-width:640px;width:100%;margin:0 auto}
.q-kicker{color:var(--gold);font-weight:900;font-size:14px;letter-spacing:.3px}
.q-title{font-size:23px;font-weight:900;line-height:1.65}
.teach-card{background:linear-gradient(160deg,var(--card),var(--card2));border:1.5px solid var(--line);border-radius:24px;padding:22px;position:relative}
.teach-bubble{background:var(--card2);border:1px solid var(--line);border-radius:18px;padding:16px 18px;margin-bottom:12px}
.teach-bubble h4{font-size:17px;font-weight:900;color:var(--green);margin-bottom:8px}
.teach-bubble p{font-size:15.5px;line-height:2;color:#d7dce8;font-weight:600}
.teach-bubble .code{background:#0d1017;border:1px solid var(--line);border-radius:8px;padding:1px 8px;color:var(--blue);font-size:13.5px;font-weight:700;margin:0 2px}
.teach-tip{display:flex;gap:10px;align-items:flex-start;background:rgba(251,191,36,.09);border:1px solid rgba(251,191,36,.35);border-radius:14px;padding:12px 14px;font-size:14px;font-weight:700;color:var(--gold);line-height:1.9}

/* options */
.opts{display:flex;flex-direction:column;gap:12px}
.opt{background:var(--card);border:2px solid var(--line);border-radius:18px;padding:17px 18px;font-size:17px;font-weight:800;color:var(--txt);cursor:pointer;text-align:right;transition:all .14s;font-family:inherit;line-height:1.7;min-height:56px}
.opt:hover{border-color:var(--green)}
.opt.sel{border-color:var(--green);background:rgba(74,222,128,.1)}
.opt.correct{border-color:var(--green);background:rgba(74,222,128,.16);animation:pop .35s}
.opt.wrong{border-color:var(--red);background:rgba(248,113,113,.13);animation:shake .4s}
.opt:disabled{cursor:default}
.tf-row{display:flex;gap:12px}
.tf-row .opt{flex:1;text-align:center;font-size:19px;justify-content:center}
@keyframes pop{0%{transform:scale(.92)}60%{transform:scale(1.04)}100%{transform:scale(1)}}

/* chips (blank) */
.blank-sentence{font-size:19px;font-weight:900;line-height:2.2;background:var(--card);border:1.5px solid var(--line);border-radius:18px;padding:18px;min-height:70px}
.blank-slot{display:inline-block;min-width:96px;border-bottom:3px dashed var(--gold);color:var(--gold);text-align:center;padding:0 8px}
.chips{display:flex;flex-wrap:wrap;gap:10px}
.chip{background:var(--card2);border:2px solid var(--line);border-radius:14px;padding:12px 18px;font-size:16px;font-weight:800;cursor:pointer;transition:all .13s;font-family:inherit;color:var(--txt);min-height:48px}
.chip:not(:disabled):hover{border-color:var(--green)}
.chip.used{opacity:.28;pointer-events:none}
.chip.correct{border-color:var(--green);background:rgba(74,222,128,.16)}
.chip.wrong{border-color:var(--red);background:rgba(248,113,113,.13);animation:shake .4s}

/* match */
.match-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.match-item{background:var(--card);border:2px solid var(--line);border-radius:14px;padding:13px 12px;font-size:14.5px;font-weight:800;cursor:pointer;text-align:center;transition:all .13s;font-family:inherit;color:var(--txt);min-height:52px;line-height:1.6}
.match-item.sel{border-color:var(--gold);background:rgba(251,191,36,.1)}
.match-item.paired{border-color:var(--green);background:rgba(74,222,128,.14);pointer-events:none}
.match-item.err{border-color:var(--red);animation:shake .4s}
.match-item code{font-size:13px}

/* order */
.order-pool,.order-line{display:flex;flex-direction:column;gap:9px}
.oline{background:var(--card2);border:2px solid var(--line);border-radius:13px;padding:12px 15px;font-size:14.5px;font-weight:800;cursor:pointer;transition:all .13s;font-family:inherit;color:var(--txt);text-align:ltr;direction:ltr;line-height:1.55;min-height:48px}
.oline:hover{border-color:var(--gold)}
.oline.placed{opacity:.4;border-style:dashed}
.oline.error-flash{border-color:var(--red);animation:shake .4s}
.order-answer{background:rgba(74,222,128,.06);border:2px dashed var(--green);border-radius:16px;padding:12px;min-height:60px}

/* feedback bar */
#feedback-slot{min-height:0}
.fb{display:flex;gap:12px;align-items:flex-start;border-radius:18px;padding:14px 16px;margin-bottom:12px;animation:rise .25s;font-size:15px;line-height:1.9;font-weight:700}
.fb-ok{background:rgba(74,222,128,.13);border:1.5px solid var(--green);color:#d9ffe7}
.fb-no{background:rgba(248,113,113,.12);border:1.5px solid var(--red);color:#ffe4e4}
.fb .ic{font-size:24px}
.fb b{font-weight:900}
.lesson-actions{position:sticky;bottom:0;background:linear-gradient(180deg,transparent,var(--bg) 30%);padding:14px 0 calc(14px + env(safe-area-inset-bottom));z-index:5}

/* ── juice: xp flyup + combo badge ── */
.xp-flyup{position:absolute;left:50%;top:-6px;transform:translateX(-50%);color:var(--gold);font-weight:900;font-size:21px;pointer-events:none;animation:flyup .95s ease-out forwards;text-shadow:0 2px 10px rgba(251,191,36,.45);white-space:nowrap}
@keyframes flyup{0%{opacity:0;transform:translate(-50%,10px) scale(.7)}25%{opacity:1;transform:translate(-50%,0) scale(1.12)}100%{opacity:0;transform:translate(-50%,-52px) scale(1)}}
.combo-badge{position:absolute;top:6px;left:50%;transform:translateX(-50%);background:linear-gradient(90deg,#ff9d3c,#fbbf24);color:#3b1d00;padding:10px 22px;border-radius:999px;font-weight:900;font-size:17.5px;box-shadow:0 10px 26px rgba(255,157,60,.35);z-index:6;pointer-events:none;animation:combopop 1.2s ease forwards;white-space:nowrap}
@keyframes combopop{0%{opacity:0;transform:translate(-50%,16px) scale(.55)}18%{opacity:1;transform:translate(-50%,0) scale(1.12)}32%{transform:translate(-50%,0) scale(1)}78%{opacity:1;transform:translate(-50%,0) scale(1)}100%{opacity:0;transform:translate(-50%,-20px) scale(1)}}

/* ═══════════ RESULT ═══════════ */
#screen-result{justify-content:center;align-items:center;text-align:center}
#confetti,.fx-canvas{position:fixed;inset:0;width:100%;height:100%;pointer-events:none;z-index:50}
.result-wrap{display:flex;flex-direction:column;align-items:center;gap:14px;max-width:480px;animation:pop .5s}
.result-wrap h2{font-size:34px;font-weight:900}
.result-stats{display:flex;gap:12px;width:100%;justify-content:center}
.rstat{background:var(--card);border:1.5px solid var(--line);border-radius:18px;padding:16px 22px;min-width:110px}
.rstat b{display:block;font-size:26px;font-weight:900;color:var(--gold);animation:statpop .5s both}
.rstat:nth-child(2) b{animation-delay:.12s}.rstat:nth-child(3) b{animation-delay:.24s}.rstat:nth-child(4) b{animation-delay:.36s}
@keyframes statpop{0%{transform:scale(.4);opacity:0}70%{transform:scale(1.18)}100%{transform:scale(1);opacity:1}}
.levelup{background:linear-gradient(90deg,rgba(167,139,250,.16),rgba(251,191,36,.16));border:1.5px solid rgba(167,139,250,.55);color:#e4dbff;padding:10px 24px;border-radius:999px;font-weight:900;font-size:16px;animation:pop .55s .3s both}
.rstat span{font-size:12.5px;color:var(--mut);font-weight:700}
.result-msg{color:var(--mut);font-size:16px;font-weight:800;line-height:2}
#screen-result .btn-xl{max-width:340px}
@media (max-width:480px){
  .intro-title{font-size:40px}
  .q-title{font-size:20px}
  .rstat{min-width:90px;padding:13px 14px}
  .node-row:nth-child(odd){transform:translateX(-22px)}
  .node-row:nth-child(even){transform:translateX(22px)}
  .result-stats{flex-wrap:wrap}
}