:root {
  --bg: #0f1117;
  --bg-soft: #161a23;
  --surface: #1c212d;
  --surface-2: #232a39;
  --border: #2d3548;
  --text: #e8ecf4;
  --muted: #9aa6bd;
  --primary: #2dd4bf;
  --primary-d: #14b8a6;
  --accent: #f59e0b;
  --green: #34d399;
  --red: #f87171;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
  --radius: 16px;
  --arabic: 'Noto Naskh Arabic', 'Amiri', 'Segoe UI', serif;
  --sans: 'Plus Jakarta Sans', system-ui, -apple-system, 'Segoe UI', sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background:
    radial-gradient(1200px 600px at 85% -10%, rgba(45, 212, 191, 0.12), transparent 60%),
    radial-gradient(900px 500px at 0% 0%, rgba(245, 158, 11, 0.08), transparent 55%),
    var(--bg);
  color: var(--text);
  font-family: var(--sans);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a { color: inherit; text-decoration: none; }
button { font-family: inherit; }

/* ---------- Header / nav ---------- */
.app-header {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.75rem 1.25rem;
  background: rgba(15, 17, 23, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.brand { display: flex; align-items: center; gap: 0.7rem; cursor: pointer; }
.brand-mark {
  font-family: var(--arabic);
  font-size: 1.9rem;
  line-height: 1;
  width: 46px; height: 46px;
  display: grid; place-items: center;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #06231f;
  font-weight: 700;
  box-shadow: var(--shadow);
}
.brand-text strong { display: block; font-size: 1.15rem; letter-spacing: 0.2px; }
.brand-text small { color: var(--muted); font-size: 0.72rem; }

.tabs { display: flex; gap: 0.25rem; margin-left: auto; }
.tabs a {
  padding: 0.55rem 0.95rem;
  border-radius: 10px;
  color: var(--muted);
  font-weight: 600;
  font-size: 0.92rem;
  transition: all 0.15s ease;
}
.tabs a:hover { color: var(--text); background: var(--surface); }
.tabs a.active { color: #06231f; background: var(--primary); }

.menu-toggle {
  display: none;
  margin-left: auto;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  font-size: 1.3rem;
  border-radius: 10px;
  padding: 0.35rem 0.6rem;
  cursor: pointer;
}

/* ---------- Layout ---------- */
.view {
  width: 100%;
  max-width: 1040px;
  margin: 0 auto;
  padding: 2rem 1.25rem 4rem;
  flex: 1;
  animation: fade 0.25s ease;
}
@keyframes fade { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

.app-footer {
  text-align: center;
  color: var(--muted);
  font-size: 0.78rem;
  padding: 1.25rem;
  border-top: 1px solid var(--border);
}

.page-head { margin-bottom: 1.5rem; }
.page-head h1 { margin: 0 0 0.3rem; font-size: 1.8rem; }
.page-head p { margin: 0; color: var(--muted); }

/* ---------- Cards ---------- */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
}
.grid { display: grid; gap: 1rem; }
.cols-2 { grid-template-columns: repeat(2, 1fr); }
.cols-3 { grid-template-columns: repeat(3, 1fr); }
.cols-4 { grid-template-columns: repeat(4, 1fr); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text);
  padding: 0.65rem 1.1rem;
  border-radius: 11px;
  font-weight: 600;
  font-size: 0.92rem;
  cursor: pointer;
  transition: all 0.15s ease;
}
.btn:hover { border-color: var(--primary); transform: translateY(-1px); }
.btn-primary { background: var(--primary); color: #06231f; border-color: transparent; }
.btn-primary:hover { background: var(--primary-d); }
.btn-ghost { background: transparent; }
.btn-block { width: 100%; }
.btn-lg { padding: 0.85rem 1.4rem; font-size: 1rem; }
.btn-sm { padding: 0.4rem 0.7rem; font-size: 0.82rem; }

.speak-btn {
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--primary);
  width: 40px; height: 40px;
  border-radius: 50%;
  font-size: 1.1rem;
  cursor: pointer;
  display: inline-grid;
  place-items: center;
  transition: all 0.15s ease;
}
.speak-btn:hover { background: var(--primary); color: #06231f; transform: scale(1.05); }
.speak-btn.speaking { animation: pulse 0.8s ease infinite; }
@keyframes pulse { 50% { box-shadow: 0 0 0 6px rgba(45,212,191,0.18); } }

/* ---------- Arabic text ---------- */
.ar { font-family: var(--arabic); direction: rtl; line-height: 1.6; }
.translit { color: var(--accent); font-style: italic; }

/* ---------- Progress ---------- */
.progress { height: 9px; background: var(--surface-2); border-radius: 999px; overflow: hidden; }
.progress > span { display: block; height: 100%; background: linear-gradient(90deg, var(--primary), var(--green)); border-radius: 999px; transition: width 0.4s ease; }

.stat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; margin-bottom: 1.75rem; }
.stat { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.1rem; }
.stat .num { font-size: 1.9rem; font-weight: 800; line-height: 1; }
.stat .lbl { color: var(--muted); font-size: 0.8rem; margin-top: 0.35rem; }
.stat .num.fire { color: var(--accent); }

.module-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.1rem; }
.module {
  display: block;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.4rem;
  cursor: pointer;
  transition: all 0.18s ease;
}
.module:hover { border-color: var(--primary); transform: translateY(-3px); box-shadow: var(--shadow); }
.module .emoji { font-size: 2rem; }
.module h3 { margin: 0.6rem 0 0.3rem; }
.module p { margin: 0 0 1rem; color: var(--muted); font-size: 0.9rem; }

/* ---------- Alphabet ---------- */
.letter-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 0.8rem; }
.letter-tile {
  position: relative;
  aspect-ratio: 1;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  display: grid;
  place-items: center;
  cursor: pointer;
  transition: all 0.15s ease;
}
.letter-tile:hover { border-color: var(--primary); transform: translateY(-2px); }
.letter-tile.learned { border-color: var(--green); }
.letter-tile.learned::after { content: '✓'; position: absolute; top: 6px; right: 8px; color: var(--green); font-size: 0.8rem; }
.letter-tile .glyph { font-family: var(--arabic); font-size: 2.4rem; }
.letter-tile .name { position: absolute; bottom: 6px; font-size: 0.7rem; color: var(--muted); }

.letter-detail { display: grid; grid-template-columns: 1.1fr 1fr; gap: 1.5rem; align-items: start; }
.big-glyph { font-family: var(--arabic); font-size: 6rem; text-align: center; line-height: 1; }
.forms-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0.6rem; text-align: center; }
.form-box { background: var(--surface-2); border: 1px solid var(--border); border-radius: 12px; padding: 0.8rem 0.4rem; }
.form-box .f { font-family: var(--arabic); font-size: 2rem; }
.form-box .t { color: var(--muted); font-size: 0.72rem; margin-top: 0.3rem; }

/* ---------- Flashcards ---------- */
.deck-card { cursor: pointer; }
.flashcard-wrap { max-width: 480px; margin: 0 auto; }
.flashcard {
  perspective: 1200px;
  height: 280px;
  margin-bottom: 1.25rem;
}
.flashcard-inner {
  position: relative;
  width: 100%; height: 100%;
  transition: transform 0.5s;
  transform-style: preserve-3d;
  cursor: pointer;
}
.flashcard.flipped .flashcard-inner { transform: rotateY(180deg); }
.flashcard-face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.8rem;
  padding: 1.5rem;
}
.flashcard-face.back { transform: rotateY(180deg); background: var(--surface-2); }
.flashcard-face .word-ar { font-family: var(--arabic); font-size: 3.4rem; line-height: 1.2; }
.flashcard-face .word-en { font-size: 2rem; font-weight: 700; }
.flashcard-face .hint { color: var(--muted); font-size: 0.85rem; }

/* ---------- Quiz ---------- */
.quiz-options { display: grid; gap: 0.8rem; margin-top: 1.25rem; }
.quiz-option {
  text-align: left;
  padding: 1rem 1.2rem;
  font-size: 1.05rem;
}
.quiz-option.correct { background: rgba(52, 211, 153, 0.18); border-color: var(--green); }
.quiz-option.wrong { background: rgba(248, 113, 113, 0.16); border-color: var(--red); }
.quiz-prompt { font-size: 2.6rem; text-align: center; margin: 1rem 0; }
.quiz-prompt.ar { font-family: var(--arabic); }
.quiz-bar { display: flex; justify-content: space-between; align-items: center; color: var(--muted); font-size: 0.9rem; }
.match-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0.7rem; }
.match-item { padding: 0.9rem; text-align: center; }
.match-item.selected { border-color: var(--accent); }
.match-item.matched { opacity: 0.35; pointer-events: none; border-color: var(--green); }
.feedback { text-align: center; font-weight: 700; min-height: 1.4rem; margin-top: 1rem; }
.feedback.ok { color: var(--green); }
.feedback.no { color: var(--red); }
.quiz-input { width: 100%; padding: 0.9rem 1rem; font-size: 1.1rem; border-radius: 12px; border: 1px solid var(--border); background: var(--surface-2); color: var(--text); text-align: center; }
.quiz-input:focus { outline: none; border-color: var(--primary); }

/* ---------- Grammar ---------- */
.lesson-nav { display: flex; gap: 0.5rem; flex-wrap: wrap; margin-bottom: 1.5rem; }
.lesson-chip { padding: 0.5rem 0.9rem; border-radius: 999px; font-size: 0.85rem; }
.lesson-chip.active { background: var(--primary); color: #06231f; border-color: transparent; }
.lesson-chip.done::before { content: '✓ '; color: var(--green); }
.phrase-row {
  display: flex; align-items: center; gap: 1rem;
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}
.phrase-row:last-child { border-bottom: none; }
.phrase-row .ar { font-size: 1.8rem; flex: 0 1 auto; min-width: 120px; text-align: right; line-height: 1.7; }
.phrase-row .meaning { flex: 1 1 180px; }
.phrase-row .meaning strong { display: block; }
.phrase-row .meaning small { color: var(--accent); font-style: italic; }
.note { background: var(--surface-2); border-left: 3px solid var(--accent); border-radius: 8px; padding: 0.9rem 1.1rem; margin: 1rem 0; color: var(--muted); }
.note strong { color: var(--text); }
.conj-table { width: 100%; border-collapse: collapse; margin-top: 1rem; }
.conj-table th, .conj-table td { padding: 0.6rem 0.8rem; border-bottom: 1px solid var(--border); text-align: left; }
.conj-table th { color: var(--muted); font-weight: 600; font-size: 0.85rem; }
.conj-table .ar { font-size: 1.5rem; }

.toolbar { display: flex; gap: 0.6rem; align-items: center; flex-wrap: wrap; margin-bottom: 1.25rem; }
.toolbar .spacer { flex: 1; }
.pill { padding: 0.45rem 0.85rem; border-radius: 999px; background: var(--surface); border: 1px solid var(--border); font-size: 0.85rem; color: var(--muted); }
.center { text-align: center; }
.muted { color: var(--muted); }
.mt { margin-top: 1.25rem; }
.row { display: flex; gap: 0.7rem; align-items: center; flex-wrap: wrap; }
.between { justify-content: space-between; }

/* ---------- Responsive ---------- */
@media (max-width: 760px) {
  .tabs { position: fixed; top: 70px; right: 1rem; flex-direction: column; background: var(--surface); border: 1px solid var(--border); border-radius: 14px; padding: 0.5rem; box-shadow: var(--shadow); display: none; }
  .tabs.open { display: flex; }
  .menu-toggle { display: block; }
  .letter-grid { grid-template-columns: repeat(4, 1fr); }
  .letter-detail { grid-template-columns: 1fr; }
  .module-grid, .cols-2, .cols-3, .cols-4 { grid-template-columns: 1fr; }
  .stat-grid { grid-template-columns: repeat(2, 1fr); }
}