/* ===== Yousef VHP-Tram companion — mobile-first, RTL ===== */
:root{
  --bg:#0b1f36;
  --bg2:#0e2a47;
  --card:#132f4f;
  --card2:#1a3a5f;
  --line:#24466e;
  --text:#eaf2fb;
  --muted:#9db4cc;
  --accent:#ffc93c;
  --accent2:#ff9f1c;
  --green:#2ec4a0;
  --red:#ff5d6c;
  --blue:#4da3ff;
  --radius:16px;
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
/* mobile QoL: kill double-tap zoom delay & accidental text selection on controls */
button, .unit-card, .tool-card, .flashcard, .q-opt, .chip{
  touch-action:manipulation;
  -webkit-user-select:none;user-select:none;
}
html,body{margin:0;padding:0}
body{
  background:linear-gradient(180deg,var(--bg) 0%,var(--bg2) 100%);
  color:var(--text);
  font-family:'Tajawal',system-ui,-apple-system,'Segoe UI',sans-serif;
  min-height:100vh;
  font-size:17px;
  line-height:1.7;
}
#app{max-width:560px;margin:0 auto;padding-bottom:40px}
.hidden{display:none!important}
b,strong{font-weight:700}
.nl{direction:ltr;unicode-bidi:isolate;font-weight:600}

/* ===== Topbar ===== */
#topbar{
  position:sticky;top:0;z-index:50;
  display:flex;align-items:center;gap:8px;
  padding:calc(env(safe-area-inset-top) + 10px) 14px 10px;
  background:rgba(11,31,54,.92);backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);
}
#topTitle{flex:1;text-align:center;font-weight:800;font-size:18px}
.icon-btn{
  background:var(--card);color:var(--text);border:1px solid var(--line);
  width:40px;height:40px;border-radius:12px;font-size:22px;line-height:1;
  display:flex;align-items:center;justify-content:center;cursor:pointer;
}
.icon-btn:active{transform:scale(.94)}
/* RTL: back chevron sits on the right, so it must point right */
#backBtn{transform:scaleX(-1)}
#backBtn:active{transform:scaleX(-1) scale(.94)}

/* ===== Screens ===== */
.screen{padding:16px 16px 8px;animation:fadeIn .25s ease}
@keyframes fadeIn{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
.screen-title{margin:6px 0 4px;font-size:22px;font-weight:800}
.screen-sub{margin:0 0 16px;color:var(--muted);font-size:15px}

/* ===== Hero ===== */
.hero{text-align:center;padding:10px 0 4px}
.hero-ring{position:relative;width:130px;height:130px;margin:0 auto 8px}
.hero-ring svg{width:100%;height:100%}
.hero-ring-label{
  position:absolute;inset:0;display:flex;flex-direction:column;
  align-items:center;justify-content:center;
}
.hero-ring-label span{font-size:26px;font-weight:800;color:var(--accent)}
.hero-ring-label small{color:var(--muted);font-size:12px}
.hero h1{margin:4px 0 2px;font-size:24px}
.hero-sub{margin:0;color:var(--muted);font-size:15px}
.streak-box{
  display:flex;justify-content:space-between;align-items:center;
  background:var(--card);border:1px solid var(--line);border-radius:12px;
  padding:8px 14px;margin:14px 4px 0;font-size:14px;
}
.streak-box span:last-child{color:var(--muted)}

/* ===== Buttons ===== */
.big-btn{
  display:block;width:100%;margin:16px 0;
  background:linear-gradient(135deg,var(--accent) 0%,var(--accent2) 100%);
  color:#231a00;border:none;border-radius:var(--radius);
  padding:16px 18px;font-family:inherit;font-size:19px;font-weight:800;
  cursor:pointer;text-align:center;box-shadow:0 6px 18px rgba(255,201,60,.25);
}
.big-btn:active{transform:scale(.98)}
.big-btn-sub{display:block;font-size:13px;font-weight:500;opacity:.75}
.nav-btn{
  background:var(--card);color:var(--text);border:1px solid var(--line);
  border-radius:12px;padding:12px 22px;font-family:inherit;font-size:16px;font-weight:700;
  cursor:pointer;min-width:96px;
}
.nav-btn:disabled{opacity:.35}
.nav-btn.primary{background:var(--accent);color:#231a00;border-color:var(--accent)}
.nav-btn.danger{background:var(--red);color:#fff;border-color:var(--red)}

/* ===== Unit list ===== */
.unit-list{display:flex;flex-direction:column;gap:10px;margin-top:6px}
.unit-card{
  display:flex;align-items:center;gap:12px;
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:14px;cursor:pointer;text-align:right;width:100%;font-family:inherit;color:var(--text);
}
.unit-card:active{background:var(--card2)}
.unit-emoji{font-size:30px;flex-shrink:0}
.unit-info{flex:1;min-width:0}
.unit-title{font-weight:800;font-size:16px}
.unit-title small{display:block;color:var(--muted);font-weight:500;font-size:12.5px;direction:ltr;text-align:right}
.unit-meta{color:var(--muted);font-size:12.5px;margin-top:2px}
.unit-check{font-size:22px;flex-shrink:0}
.unit-bar{height:5px;background:var(--line);border-radius:3px;margin-top:7px;overflow:hidden}
.unit-bar>div{height:100%;background:var(--green);border-radius:3px;transition:width .4s}

/* ===== Tools grid ===== */
.home-tools{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:16px}
.tool-card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:16px 12px;display:flex;flex-direction:column;align-items:center;gap:6px;
  color:var(--text);font-family:inherit;cursor:pointer;font-size:15px;font-weight:700;
}
.tool-card:active{background:var(--card2)}
.tool-icon{font-size:30px}
.tool-name small{color:var(--muted);font-weight:500;font-size:12px}
.footer-note{color:var(--muted);font-size:12px;text-align:center;margin-top:22px;padding:0 10px}

/* ===== Lesson ===== */
.lesson-progress{height:6px;background:var(--line);border-radius:3px;overflow:hidden;margin-bottom:14px}
.lesson-progress>div{height:100%;background:var(--accent);width:0;transition:width .3s}
.card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:18px 16px;margin-bottom:14px;
}
.card h3{margin:0 0 10px;font-size:19px;color:var(--accent)}
.card .nl-big{font-size:24px;font-weight:800;direction:ltr;text-align:center;display:block;margin:6px 0}
.card p{margin:8px 0}
.card .ar-note{color:var(--muted);font-size:14.5px}
.callout{
  border-right:4px solid var(--accent);background:rgba(255,201,60,.08);
  border-radius:10px;padding:10px 12px;margin:10px 0;font-size:15px;
}
.callout.warn{border-color:var(--red);background:rgba(255,93,108,.1)}
.callout.good{border-color:var(--green);background:rgba(46,196,160,.1)}
.figure{background:#fff;border-radius:12px;padding:8px;margin:12px 0;text-align:center}
.figure svg{max-width:100%;height:auto}
.figure figcaption{color:#33475e;font-size:13px;font-weight:700;margin-top:4px;direction:ltr}
.vocab-table{width:100%;border-collapse:collapse;margin:8px 0}
.vocab-table td{padding:9px 6px;border-bottom:1px solid var(--line);vertical-align:top}
.vocab-table td:first-child{direction:ltr;text-align:left;font-weight:700;font-size:17px;color:var(--accent);white-space:nowrap}
.vocab-table td:last-child{font-size:15.5px}
.vocab-table tr:last-child td{border-bottom:none}
.lesson-nav{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:6px 0 16px}
.lesson-nav span{color:var(--muted);font-size:14px}

/* ===== Flashcards ===== */
.chip-row{display:flex;gap:8px;overflow-x:auto;padding:4px 0 12px;scrollbar-width:none}
.chip-row::-webkit-scrollbar{display:none}
.chip{
  flex-shrink:0;background:var(--card);border:1px solid var(--line);color:var(--text);
  border-radius:20px;padding:7px 14px;font-family:inherit;font-size:13.5px;font-weight:700;cursor:pointer;
}
.chip.active{background:var(--accent);color:#231a00;border-color:var(--accent)}
.flashcard{perspective:1200px;height:300px;margin:6px 0 14px;cursor:pointer}
.flashcard-inner{position:relative;width:100%;height:100%;transition:transform .45s;transform-style:preserve-3d}
.flashcard.flipped .flashcard-inner{transform:rotateY(180deg)}
.flash-face{
  position:absolute;inset:0;backface-visibility:hidden;-webkit-backface-visibility:hidden;
  background:var(--card);border:1px solid var(--line);border-radius:20px;
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  padding:20px;text-align:center;
}
.flash-back{transform:rotateY(180deg);background:var(--card2)}
.flash-face .nl-word{font-size:30px;font-weight:800;direction:ltr}
.flash-face .ar-word{font-size:26px;font-weight:700}
.flash-face .extra{color:var(--muted);font-size:14px;margin-top:10px}
.tap-hint{position:absolute;bottom:14px;color:var(--muted);font-size:12px}
.flash-controls{display:flex;align-items:center;justify-content:center;gap:18px}
.flash-controls span{color:var(--muted);min-width:70px;text-align:center}

/* ===== Quiz ===== */
.quiz-top{display:flex;justify-content:space-between;color:var(--muted);font-size:14px;margin-bottom:8px}
.quiz-list{display:flex;flex-direction:column;gap:10px}
.quiz-item{
  display:flex;align-items:center;gap:12px;background:var(--card);
  border:1px solid var(--line);border-radius:var(--radius);padding:14px;
  cursor:pointer;width:100%;text-align:right;color:var(--text);font-family:inherit;
}
.quiz-item:active{background:var(--card2)}
.quiz-item .q-emoji{font-size:26px}
.quiz-item .q-title{font-weight:800;font-size:15.5px}
.quiz-item .q-sub{color:var(--muted);font-size:12.5px}
.quiz-item .q-score{margin-right:auto;font-weight:800;color:var(--accent);font-size:14px;flex-shrink:0}
.q-question{font-size:19px;font-weight:700;margin:14px 0;direction:ltr;text-align:left;line-height:1.5}
.q-question .q-img{display:block;margin:0 auto 12px;max-width:100%}
.q-opts{display:flex;flex-direction:column;gap:10px}
.q-opt{
  background:var(--card);border:2px solid var(--line);border-radius:14px;
  padding:13px 14px;font-family:inherit;font-size:16.5px;color:var(--text);
  cursor:pointer;text-align:left;direction:ltr;font-weight:600;line-height:1.4;
}
.q-opt:disabled{cursor:default}
.q-opt.correct{border-color:var(--green);background:rgba(46,196,160,.15)}
.q-opt.wrong{border-color:var(--red);background:rgba(255,93,108,.15)}
.q-expl{
  margin-top:14px;background:rgba(77,163,255,.1);border:1px solid rgba(77,163,255,.35);
  border-radius:12px;padding:12px 14px;font-size:15px;animation:fadeIn .3s ease;
}
.q-expl b{color:var(--blue)}
.q-expl{cursor:pointer}
.q-expl .next-hint{
  display:block;margin-top:6px;font-size:12.5px;font-weight:700;
  color:var(--muted);opacity:.85;
}
.quiz-result{text-align:center;padding:30px 10px}
.quiz-result .big-emoji{font-size:64px}
.quiz-result h2{margin:10px 0 4px}
.quiz-result p{color:var(--muted)}

/* ===== Signals reference ===== */
.signals-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.signal-card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:10px;text-align:center}
.signal-card .fig{background:#fff;border-radius:10px;padding:6px}
.signal-card .fig svg{max-width:100%;height:auto}
.signal-card .s-code{font-weight:800;color:var(--accent);font-size:15px;margin-top:6px;direction:ltr}
.signal-card .s-name{font-size:13px;color:var(--muted)}
.signal-card .s-ar{font-size:13.5px;margin-top:2px}

/* ===== Exam ===== */
.exam-info-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:14px 16px;margin:12px 0}
.exam-info-card p{margin:6px 0}
.toggle-row{display:flex;align-items:center;gap:10px;background:var(--card);border:1px solid var(--line);border-radius:12px;padding:12px 14px;margin-bottom:6px;font-size:15.5px}
.toggle-row input{width:20px;height:20px;accent-color:var(--accent)}
#examHistory{margin-top:16px}
.exam-hist-item{display:flex;justify-content:space-between;background:var(--card);border:1px solid var(--line);border-radius:10px;padding:10px 14px;margin-bottom:8px;font-size:14px}
.exam-hist-item b{color:var(--accent)}

/* ===== Info ===== */
.info-body .card h3{font-size:17px}
.info-body ul{padding-right:20px;margin:8px 0}
.info-body li{margin:6px 0;font-size:15px}

/* ===== Tutorial (first visit) ===== */
.tutorial{
  position:fixed;inset:0;z-index:200;
  background:rgba(7,20,36,.92);backdrop-filter:blur(6px);
  display:flex;align-items:center;justify-content:center;padding:24px;
}
.tut-card{
  background:var(--card);border:1px solid var(--line);border-radius:22px;
  padding:28px 22px 20px;max-width:400px;width:100%;text-align:center;
  animation:fadeIn .3s ease;
}
.tut-emoji{font-size:56px;margin-bottom:12px}
.tut-text{font-size:17.5px;line-height:1.9;font-weight:500}
.tut-text b{color:var(--accent)}
.tut-dots{display:flex;justify-content:center;gap:7px;margin:18px 0 4px}
.tut-dots span{width:9px;height:9px;border-radius:50%;background:var(--line);transition:background .2s}
.tut-dots span.on{background:var(--accent)}
.tut-skip{
  background:none;border:none;color:var(--muted);font-family:inherit;
  font-size:14px;margin-top:10px;cursor:pointer;text-decoration:underline;
}

/* ===== Toast ===== */
.toast{
  position:fixed;bottom:24px;left:50%;transform:translateX(-50%);
  background:#1d3a5f;border:1px solid var(--line);color:var(--text);
  border-radius:12px;padding:12px 20px;font-size:15px;font-weight:700;
  z-index:100;box-shadow:0 8px 24px rgba(0,0,0,.4);max-width:90vw;text-align:center;
  animation:fadeIn .25s ease;
}

/* ===== Audio button ===== */
.sound-btn{
  display:inline-flex;align-items:center;gap:8px;background:var(--card2);
  border:1px solid var(--line);color:var(--text);border-radius:12px;
  padding:10px 16px;font-family:inherit;font-size:15px;font-weight:700;cursor:pointer;margin:6px 4px;
}
.sound-btn:active{transform:scale(.96)}
.sound-pattern{direction:ltr;font-weight:800;color:var(--accent);letter-spacing:2px}

@media (min-width:480px){
  .signals-grid{grid-template-columns:1fr 1fr 1fr}
}