:root {
  --bg: #fff9f1;
  --ink: #1f2937;
  --muted: #6b7280;
  --card: rgba(255,255,255,0.88);
  --primary: #10b981;
  --primary-dark: #059669;
  --secondary: #2563eb;
  --accent: #f59e0b;
  --border: rgba(31,41,55,0.1);
  --shadow: 0 16px 48px rgba(31,41,55,0.12);
}
* { box-sizing: border-box; }
body { margin: 0; font-family: Inter, system-ui, sans-serif; color: var(--ink); background: linear-gradient(180deg, #fff7ed 0%, #eff6ff 100%); }
.app-shell { width: min(1180px, calc(100% - 28px)); margin: 0 auto; padding: 28px 0 80px; }
.hero { display: grid; grid-template-columns: 1.5fr 0.8fr; gap: 18px; align-items: stretch; }
.hero-copy, .hero-card, .progress-panel, .word-card, .quiz-card { background: var(--card); border: 1px solid var(--border); border-radius: 28px; box-shadow: var(--shadow); backdrop-filter: blur(10px); }
.hero-copy { padding: 30px; }
.hero-card { padding: 24px; display: grid; gap: 16px; align-content: center; }
.eyebrow { margin: 0 0 10px; text-transform: uppercase; letter-spacing: .12em; color: var(--secondary); font-size: .78rem; }
h1 { margin: 0 0 12px; font-size: clamp(2.2rem, 5vw, 4.2rem); line-height: .98; max-width: 12ch; }
.lead { color: var(--muted); line-height: 1.75; max-width: 62ch; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 22px; }
.btn { border: 0; border-radius: 999px; padding: 12px 18px; font-weight: 700; cursor: pointer; }
.btn.primary { background: var(--primary); color: white; }
.btn.primary:hover { background: var(--primary-dark); }
.btn.secondary { background: #dbeafe; color: var(--secondary); }
.btn.ghost { background: #f3f4f6; color: var(--ink); }
.stat { display: flex; justify-content: space-between; align-items: baseline; padding: 12px 0; border-bottom: 1px solid var(--border); }
.stat:last-child { border-bottom: 0; }
.stat span { font-size: 2rem; font-weight: 800; }
.controls { display: flex; gap: 12px; margin: 24px 0 18px; flex-wrap: wrap; }
.controls input, .controls select { flex: 1 1 240px; padding: 14px 16px; border-radius: 16px; border: 1px solid var(--border); font-size: 1rem; }
.progress-panel { padding: 18px 20px; margin-bottom: 18px; }
.progress-topline { display: flex; justify-content: space-between; gap: 10px; margin-bottom: 10px; }
.progress-bar { height: 14px; background: #e5e7eb; border-radius: 999px; overflow: hidden; }
#progress-fill { height: 100%; width: 0%; background: linear-gradient(90deg, var(--primary), var(--accent)); }
.lesson-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; }
.word-card { padding: 18px; }
.card-head { display: flex; justify-content: space-between; gap: 8px; align-items: center; }
.pill { display: inline-flex; padding: 6px 10px; border-radius: 999px; background: #eef2ff; color: var(--secondary); font-size: .78rem; }
.know-toggle { border: 0; background: transparent; font-size: 1.2rem; cursor: pointer; }
.know-toggle.known { color: var(--accent); }
.word-card h2 { margin: 14px 0 8px; font-size: 1.35rem; }
.persian { font-size: 1.8rem; margin: 0 0 8px; direction: rtl; }
.transliteration { margin: 0; color: var(--muted); font-style: italic; }
.quiz-panel { margin-top: 24px; }
.quiz-panel.hidden { display: none; }
.quiz-header { display: flex; justify-content: space-between; gap: 12px; align-items: end; margin-bottom: 12px; }
.quiz-card { padding: 22px; }
.quiz-prompt { font-size: 1.3rem; font-weight: 700; margin: 0 0 16px; }
.quiz-options { display: grid; gap: 10px; }
.quiz-options button { text-align: left; padding: 14px 16px; border-radius: 14px; border: 1px solid var(--border); background: white; cursor: pointer; }
.quiz-options button.correct { border-color: var(--primary); background: #ecfdf5; }
.quiz-options button.wrong { border-color: #ef4444; background: #fef2f2; }
.quiz-feedback { min-height: 24px; color: var(--muted); margin: 14px 0 0; }
@media (max-width: 820px) { .hero { grid-template-columns: 1fr; } }