/* ── Reset & base ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --navy:  #12324A;
  --orange:#E07A3F;
  --cream: #F7F3EA;
  --teal:  #2A8C82;
  --white: #ffffff;
  --text:  #1a1a1a;
  --muted: #6b6b6b;
  --radius: 14px;
}

html { font-size: 16px; }
body {
  font-family: -apple-system, "Segoe UI", system-ui, sans-serif;
  background: var(--cream);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ── Header ── */
header {
  background: var(--navy);
  color: var(--white);
  padding: 14px 16px 0;
  position: sticky;
  top: 0;
  z-index: 100;
}
.header-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}
.app-title {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}
.app-subtitle {
  font-size: 0.72rem;
  opacity: 0.7;
}

/* ── Language toggle ── */
#lang-btn {
  background: var(--orange);
  color: var(--white);
  border: none;
  border-radius: 20px;
  padding: 6px 16px;
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  min-width: 60px;
  min-height: 36px;
}
#lang-btn:hover { opacity: 0.88; }

/* ── Tab navigation ── */
nav {
  display: flex;
  gap: 0;
}
.tab-btn {
  flex: 1;
  background: transparent;
  color: rgba(255,255,255,0.65);
  border: none;
  border-bottom: 3px solid transparent;
  padding: 10px 4px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
}
.tab-btn.active {
  color: var(--white);
  border-bottom-color: var(--orange);
}

/* ── Main content ── */
main { flex: 1; padding: 20px 16px; max-width: 480px; width: 100%; margin: 0 auto; }
.view { display: none; }
.view.active { display: block; }

/* ── Cards ── */
.card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 16px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.07);
}

/* ── Buttons ── */
.btn {
  display: inline-block;
  border: none;
  border-radius: 30px;
  padding: 12px 24px;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  min-height: 48px;
  transition: opacity 0.15s;
}
.btn:hover { opacity: 0.85; }
.btn-primary { background: var(--orange); color: var(--white); width: 100%; }
.btn-secondary { background: var(--teal); color: var(--white); }
.btn-ghost { background: transparent; color: var(--navy); border: 2px solid var(--navy); }
.btn:disabled { opacity: 0.4; cursor: not-allowed; }

/* ── Level badges ── */
.badge {
  display: inline-block;
  border-radius: 30px;
  padding: 8px 20px;
  font-size: 1rem;
  font-weight: 700;
  margin: 12px 0 8px;
}
.badge-understands  { background: #d4f5ef; color: #1a6b63; }
.badge-partly       { background: #fef3cd; color: #7a5c00; }
.badge-needs-help   { background: #fde8e0; color: #8b2e0e; }

/* ── Child view ── */
#child-view .question {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 14px;
  line-height: 1.4;
}
#child-view textarea {
  width: 100%;
  min-height: 130px;
  border: 2px solid #ddd;
  border-radius: var(--radius);
  padding: 12px;
  font-size: 1rem;
  font-family: inherit;
  resize: vertical;
  line-height: 1.5;
}
#child-view textarea:focus { outline: none; border-color: var(--teal); }

.hints { margin-top: 10px; }
.hint-item {
  background: #fffbe6;
  border-left: 4px solid var(--orange);
  border-radius: 6px;
  padding: 8px 12px;
  margin-bottom: 8px;
  font-size: 0.9rem;
  color: #5a3e00;
}
.result-area { text-align: center; }

/* sample answers */
.sample-select {
  width: 100%;
  padding: 10px 12px;
  border: 2px solid #ddd;
  border-radius: var(--radius);
  font-size: 0.9rem;
  background: var(--white);
  color: var(--navy);
  margin-top: 8px;
}

/* ── Parent view ── */
.wa-bubble p + p { margin-top: 8px; }
.parent-answer-hint {
  margin-top: 10px !important;
  padding-top: 10px;
  border-top: 1px dashed #b2d8b2;
  font-style: italic;
  font-size: 0.88rem;
  color: #3a5a3a;
}

.wa-bubble {
  background: #e7ffd5;
  border-radius: 14px 14px 14px 4px;
  padding: 16px 18px;
  font-size: 1rem;
  line-height: 1.65;
  color: #1a1a1a;
  position: relative;
  margin-bottom: 16px;
}
.wa-bubble::before {
  content: '';
  position: absolute;
  left: -8px; top: 14px;
  border: 8px solid transparent;
  border-right-color: #e7ffd5;
  border-left: 0;
}
.parent-btn-row { display: flex; gap: 10px; }
.parent-btn-row .btn { flex: 1; font-size: 0.9rem; }
.confirmation-text {
  text-align: center;
  color: var(--teal);
  font-weight: 700;
  font-size: 1rem;
  margin-top: 12px;
  min-height: 24px;
}

/* ── Teacher view ── */
.teacher-summary {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--navy);
  background: #eaf4f3;
  border-left: 3px solid var(--teal);
  border-radius: 8px;
  padding: 8px 12px;
  margin-bottom: 12px;
}
.student-name-block {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex: 1;
  min-width: 0;
}
.student-reason {
  font-size: 0.75rem;
  color: var(--muted);
  font-weight: 400;
  white-space: normal;
}
.badge-not-done {
  background: #9e9e9e;
  color: #fff;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 3px 9px;
  border-radius: 20px;
  white-space: nowrap;
}
.needs-help-section {
  background: #fde8e0;
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 16px;
}
.needs-help-section h2 { color: #8b2e0e; font-size: 1rem; margin-bottom: 10px; }
.student-list { display: flex; flex-direction: column; gap: 8px; }
.student-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  background: var(--white);
  border-radius: 10px;
  padding: 10px 14px;
  gap: 10px;
}
.student-name { font-size: 0.95rem; font-weight: 600; }
.badge-clickable { cursor: pointer; user-select: none; }
.badge-clickable:hover { opacity: 0.8; }

/* ── Progress bar ── */
.score-bar-wrap {
  background: #e8e3d8;
  border-radius: 8px;
  height: 12px;
  margin-top: 10px;
  overflow: hidden;
}
.score-bar-fill {
  height: 100%;
  border-radius: 8px;
  transition: width 0.4s ease, background 0.3s;
  background: var(--teal);
}

/* ── Details toggle ── */
.details-toggle-btn {
  background: none;
  border: none;
  color: var(--navy);
  font-size: 0.8rem;
  cursor: pointer;
  padding: 2px 0;
  text-decoration: underline;
  text-underline-offset: 2px;
}
.details-toggle-btn:hover { opacity: 0.7; }

/* ── Score breakdown grid ── */
.score-breakdown {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
  margin-top: 8px;
  padding: 10px 12px;
  background: var(--cream);
  border-radius: 10px;
  font-size: 0.82rem;
  color: var(--navy);
}
.score-breakdown span { font-weight: 600; }

/* ── Lesson panel ── */
.lesson-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 14px;
  text-align: center;
}
/* Diagram */
.lesson-diagram-wrap {
  position: relative;
  display: block;
  width: 100%;
  max-width: 320px;
  margin: 0 auto 6px;
}
.lesson-diagram-img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 10px;
}
.lesson-diagram-badge {
  position: absolute;
  transform: translate(-50%, -50%);
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--navy);
  color: #fff;
  border: 2px solid #fff;
  font-size: 0.72rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
  box-shadow: 0 1px 3px rgba(0,0,0,0.35);
}
.lesson-helper-note {
  font-size: 0.72rem;
  color: var(--muted);
  font-style: italic;
  text-align: center;
  margin: 0 0 16px;
}

/* Cards */
.lesson-grid {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-bottom: 14px;
}
.lesson-card {
  background: var(--cream);
  border: 1.5px solid #e0dbd0;
  border-radius: 12px;
  padding: 10px 12px;
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 10px;
}
.lesson-card-number {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--orange);
  color: #fff;
  font-size: 0.85rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}
.lesson-card-icon {
  flex-shrink: 0;
  width: 90px;
  height: 90px;
  object-fit: contain;
}
.lesson-card-body {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex: 1;
}
.lesson-card-organ {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--navy);
}
.lesson-card-fact {
  font-size: 0.82rem;
  color: var(--muted);
  line-height: 1.45;
}
.lesson-arrow {
  text-align: center;
  color: var(--orange);
  font-size: 1.1rem;
  line-height: 1;
  padding: 3px 0;
  user-select: none;
}
.lesson-note {
  font-size: 0.75rem;
  color: var(--muted);
  font-style: italic;
  text-align: center;
  margin-bottom: 16px;
  border-top: 1px solid #e0dbd0;
  padding-top: 10px;
}
.lesson-ready-btn {
  width: 100%;
  font-size: 1rem;
  padding: 14px;
}


/* ── Voice answer ── */
.voice-row {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 6px;
  margin-top: 10px;
}
.btn-voice {
  background: var(--teal);
  color: var(--white);
  border-radius: 30px;
  padding: 12px 24px;
  font-size: 1rem;
  font-weight: 700;
  border: none;
  cursor: pointer;
  min-height: 48px;
  transition: background 0.2s, opacity 0.15s;
}
.btn-voice:hover { opacity: 0.88; }
.voice-btn-listening {
  background: #c0392b !important;
}
.voice-indicator {
  display: none;
  font-size: 0.8rem;
  color: #c0392b;
  font-weight: 600;
  animation: voice-pulse 1.2s ease-in-out infinite;
}
@keyframes voice-pulse {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.35; }
}
.voice-note {
  font-size: 0.75rem;
  color: var(--muted);
  line-height: 1.45;
}
.voice-preview {
  display: none;
  font-size: 0.8rem;
  color: #888;
  font-style: italic;
  margin-top: 4px;
}
.voice-error {
  display: none;
  font-size: 0.82rem;
  color: #8b2e0e;
  background: #fde8e0;
  border-radius: 8px;
  padding: 6px 10px;
  margin-top: 4px;
}

/* ── Footer ── */
footer {
  text-align: center;
  padding: 16px;
  font-size: 0.72rem;
  color: var(--muted);
  border-top: 1px solid #e0dbd0;
}