:root {
  --color-bg: #faf7f2;
  --color-card: #ffffff;
  --color-primary: #2f6f5e;
  --color-primary-dark: #234f43;
  --color-accent: #e8935c;
  --color-text: #2b2b2b;
  --color-muted: #6b6b6b;
  --color-border: #e7e1d8;
  --color-success: #3a8f5c;
  --color-error: #c0503b;
  --radius: 16px;
  --shadow: 0 2px 10px rgba(0,0,0,0.06);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, Helvetica, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  -webkit-font-smoothing: antialiased;
}

.app {
  max-width: 560px;
  margin: 0 auto;
  padding: 16px 16px 100px;
  min-height: 100vh;
}

.hidden { display: none !important; }

.brand { text-align: center; padding: 24px 0 8px; }
.brand-emoji { font-size: 40px; }
.brand h1 { margin: 4px 0 0; font-size: 28px; color: var(--color-primary-dark); }
.tagline { margin: 4px 0 0; color: var(--color-muted); font-size: 14px; }

.card {
  background: var(--color-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px;
  margin-bottom: 16px;
}

.field { display: block; margin-bottom: 18px; }
.field > span, fieldset.field > legend { display: block; font-weight: 600; margin-bottom: 8px; font-size: 15px; }
fieldset.field { border: none; padding: 0; margin: 0 0 18px; }

input[type="text"], textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1.5px solid var(--color-border);
  border-radius: 12px;
  font-size: 16px;
  font-family: inherit;
  background: #fff;
}
textarea { resize: vertical; }
input[type="text"]:focus, textarea:focus { outline: none; border-color: var(--color-primary); }

.tags { display: flex; flex-direction: column; gap: 8px; }
.tag-option {
  display: flex; align-items: center; gap: 10px;
  border: 1.5px solid var(--color-border);
  border-radius: 12px; padding: 10px 12px; cursor: pointer;
  font-size: 14px;
}
.tag-option input { width: 18px; height: 18px; }
.tag-option:has(input:checked) { border-color: var(--color-primary); background: #eef6f2; }

.btn {
  display: block;
  width: 100%;
  padding: 14px 16px;
  border-radius: 14px;
  border: none;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  text-align: center;
  text-decoration: none;
}
.btn-primary { background: var(--color-primary); color: #fff; }
.btn-primary:active { background: var(--color-primary-dark); }
.btn-primary:disabled { opacity: 0.5; cursor: default; }
.btn-secondary { background: transparent; color: var(--color-primary-dark); border: 1.5px solid var(--color-border); }
.btn-cta { background: #25D366; color: #fff; margin-top: 10px; }

.sticky-btn {
  position: sticky;
  bottom: 12px;
  margin-top: 4px;
}

.topbar { display: flex; justify-content: space-between; align-items: center; padding: 12px 0; }
.hello { font-size: 18px; font-weight: 700; color: var(--color-primary-dark); }

.banner {
  background: #fff3e6; border: 1.5px solid #f0c69a; color: #8a5a24;
  padding: 12px 14px; border-radius: 12px; margin-bottom: 14px; font-size: 14px;
}

.section-title { font-size: 16px; margin: 8px 0 12px; color: var(--color-muted); }

.topics-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.topic-card {
  background: var(--color-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px 10px;
  text-align: center;
  cursor: pointer;
  border: 2px solid transparent;
  position: relative;
}
.topic-card .emoji { font-size: 30px; display: block; margin-bottom: 6px; }
.topic-card .label { font-weight: 700; font-size: 14px; }
.topic-card.unlocked { border-color: var(--color-primary); }
.topic-card.locked { opacity: 0.6; }
.topic-card .lock { position: absolute; top: 8px; left: 8px; font-size: 14px; }

.hint-note { font-size: 13px; color: var(--color-muted); margin-top: 16px; text-align: center; }

.progress-bar { height: 8px; background: var(--color-border); border-radius: 8px; overflow: hidden; margin-bottom: 12px; }
.progress-fill { height: 100%; background: var(--color-accent); width: 0%; transition: width .3s; }
.progress-label { font-size: 13px; color: var(--color-muted); margin-bottom: 10px; text-align: center; }

.text-title { margin: 0 0 12px; font-size: 20px; }
.skim-instruction { font-size: 14px; color: var(--color-muted); margin: 0 0 14px; direction: rtl; text-align: right; }
.text-body { font-size: 16px; line-height: 1.9; }
.text-line { margin-bottom: 4px; }
.text-line .line-no { color: #bbb; font-size: 12px; margin-inline-end: 6px; user-select: none; }

.btn-text-toggle {
  display: block;
  width: 100%;
  background: transparent;
  border: 1.5px dashed var(--color-border);
  color: var(--color-primary-dark);
  border-radius: 12px;
  padding: 10px 12px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  margin-bottom: 12px;
}

.answer-actions { display: flex; flex-direction: column; gap: 8px; }
.answer-actions .btn { margin: 0; }

.text-overlay {
  position: fixed; inset: 0; background: rgba(43,43,43,0.5);
  display: flex; align-items: flex-end; justify-content: center;
  z-index: 80; padding: 0;
}
.text-overlay-card {
  background: var(--color-card);
  border-radius: var(--radius) var(--radius) 0 0;
  padding: 18px;
  width: 100%;
  max-width: 560px;
  max-height: 82vh;
  overflow-y: auto;
}
.text-overlay-header { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 8px; }
.text-overlay-header .text-title { margin: 0; }
.btn-close {
  background: var(--color-bg); border: 1.5px solid var(--color-border);
  border-radius: 50%; width: 32px; height: 32px; flex-shrink: 0;
  font-size: 15px; cursor: pointer; color: var(--color-text);
}

.q-prompt { font-size: 17px; font-weight: 600; margin: 0 0 16px; line-height: 1.5; }

.mc-options { display: flex; flex-direction: column; gap: 10px; margin-bottom: 12px; }
.mc-option {
  border: 1.5px solid var(--color-border);
  border-radius: 12px;
  padding: 12px 14px;
  cursor: pointer;
  font-size: 15px;
  direction: ltr;
  text-align: left;
}
.mc-option:hover { border-color: var(--color-primary); }
.mc-option.selected { border-color: var(--color-primary); background: #eef6f2; }
.mc-option.correct { border-color: var(--color-success); background: #eaf7ee; }
.mc-option.incorrect { border-color: var(--color-error); background: #fbece9; }

.feedback-box {
  margin-top: 14px;
  padding: 12px 14px;
  border-radius: 12px;
  background: #f4f8f6;
  border: 1.5px solid #cfe4da;
  font-size: 14.5px;
  line-height: 1.6;
}
.feedback-box.correct { background: #eaf7ee; border-color: #b9e0c4; }
.feedback-box.incorrect { background: #fdf3ee; border-color: #f0c9b5; }

.summary-card { text-align: center; }
.score-circle {
  width: 84px; height: 84px; border-radius: 50%;
  background: var(--color-primary); color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 24px; font-weight: 800;
  margin: 0 auto 14px;
}
.summary-title { margin: 0 0 8px; font-size: 20px; }
.summary-text { color: var(--color-text); line-height: 1.7; }

.cta-card { text-align: center; }
.cta-primary { font-weight: 700; font-size: 16px; margin: 0 0 4px; }
.cta-nudge { margin-top: 14px; font-size: 14px; color: var(--color-muted); background: #fff3e6; border-radius: 10px; padding: 10px; }

.toast {
  position: fixed; bottom: 20px; left: 50%; transform: translateX(-50%);
  background: #2b2b2b; color: #fff; padding: 10px 18px; border-radius: 10px;
  font-size: 14px; max-width: 90%; text-align: center; z-index: 50;
}

.loading {
  position: fixed; inset: 0; background: rgba(250,247,242,0.92);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 12px; z-index: 100;
}
.spinner {
  width: 36px; height: 36px; border-radius: 50%;
  border: 4px solid var(--color-border); border-top-color: var(--color-primary);
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

@media (min-width: 600px) {
  .topics-grid { grid-template-columns: 1fr 1fr 1fr; }
}