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

:root {
  --primary:   #5b8dee;
  --primary-d: #3a6fd8;
  --success:   #34c47c;
  --danger:    #f05f5f;
  --warning:   #f7b731;
  --bg:        #f0f6ff;
  --card-bg:   #ffffff;
  --text:      #2d3748;
  --muted:     #718096;
  --radius:    18px;
  --shadow:    0 4px 24px rgba(91,141,238,.15);
}

body {
  font-family: 'Segoe UI', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

/* ── Header ── */
header {
  background: var(--primary);
  color: #fff;
  padding: .75rem 1.5rem;
  box-shadow: 0 2px 8px rgba(0,0,0,.15);
}
.header-inner {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.logo { font-size: 1.3rem; font-weight: 700; letter-spacing: .5px; }
.teacher-link {
  color: #fff;
  text-decoration: none;
  font-size: .9rem;
  background: rgba(255,255,255,.2);
  padding: .3rem .8rem;
  border-radius: 999px;
  transition: background .2s;
}
.teacher-link:hover { background: rgba(255,255,255,.35); }

/* ── Screens ── */
#app {
  max-width: 720px;
  margin: 2rem auto;
  padding: 0 1rem;
}

.screen { display: flex; flex-direction: column; align-items: center; }
.hidden { display: none !important; }

.card {
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 2.5rem 2rem;
  width: 100%;
  gap: 1.25rem;
}

/* ── Start screen ── */
.mascot { font-size: 4rem; line-height: 1; }

h1 { font-size: 2rem; color: var(--primary); text-align: center; }
h2 { font-size: 1.6rem; color: var(--primary); text-align: center; }

/* ── Buttons ── */
.btn-primary, .btn-secondary {
  border: none;
  border-radius: 999px;
  cursor: pointer;
  font-size: 1rem;
  font-weight: 700;
  padding: .7rem 1.8rem;
  transition: transform .1s, box-shadow .2s;
}
.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 4px 12px rgba(91,141,238,.4);
}
.btn-primary:hover  { background: var(--primary-d); }
.btn-primary:active { transform: scale(.97); }
.btn-secondary {
  background: #e8eef8;
  color: var(--primary);
}
.btn-secondary:hover { background: #d4e0f5; }
.big-btn { font-size: 1.2rem; padding: .9rem 2.5rem; }

.btn-row {
  display: flex;
  gap: .75rem;
  justify-content: center;
  margin-top: .5rem;
}

/* ── Lesson header ── */
.lesson-header {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: .5rem;
}
.phase-badge {
  background: var(--primary);
  color: #fff;
  border-radius: 999px;
  padding: .25rem .85rem;
  font-size: .85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .5px;
}
.sight-word-badge {
  background: #fff8e1;
  border: 2px solid var(--warning);
  border-radius: 999px;
  padding: .25rem 1rem;
  font-size: .9rem;
}

/* ── Sentence ── */
#sentence-area {
  width: 100%;
  min-height: 5rem;
  display: flex;
  align-items: center;
  justify-content: center;
}
.sentence {
  font-size: 2rem;
  line-height: 1.5;
  text-align: center;
  word-spacing: .3rem;
}
.word-token {
  display: inline-block;
  padding: .1rem .35rem;
  border-radius: 8px;
  cursor: default;
  transition: background .15s, transform .1s;
  position: relative;
}
/* Clickable mode */
.word-token.clickable {
  cursor: pointer;
}
.word-token.clickable:hover {
  background: #e8eef8;
  transform: scale(1.1);
}
/* Highlighted while being read */
.word-token.speaking {
  background: #fff176;
  transform: scale(1.15);
}
/* The sight word */
.word-token.sight-word {
  text-decoration: underline;
  text-decoration-color: var(--primary);
  text-decoration-thickness: 3px;
  font-weight: 700;
  color: var(--primary);
}
/* Correct / wrong feedback on the token */
.word-token.correct-flash {
  background: #c8f7dc;
  animation: pop .4s ease;
}
.word-token.wrong-flash {
  background: #ffd6d6;
  animation: shake .4s ease;
}

/* Hoverable words (listen & read phases only — not during tests) */
.word-token.hoverable { cursor: pointer; }
.word-token.hoverable:hover {
  background: #dbeafe;
  outline: 1.5px dashed var(--primary);
  outline-offset: 2px;
}

@keyframes pop {
  0%   { transform: scale(1); }
  50%  { transform: scale(1.25); }
  100% { transform: scale(1); }
}
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25%       { transform: translateX(-6px); }
  75%       { transform: translateX(6px); }
}

/* ── Audio pending indicator ── */
.audio-pending {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: .9rem;
  font-weight: 600;
  color: var(--primary);
  background: #dbeafe;
  border-radius: 999px;
  padding: .35rem 1.25rem;
  min-width: 11rem;  /* wide enough that text swaps don't cause layout shift */
  width: fit-content;
  margin: 0 auto;
  transition: background .3s, color .3s;
}

/* Show only the relevant child state */
.audio-pending .ap-loading,
.audio-pending .ap-playing,
.audio-pending .ap-done { display: none; }

.audio-pending:not(.is-playing):not(.is-done) .ap-loading {
  display: inline-flex; align-items: center; gap: .45rem;
}
.audio-pending.is-playing .ap-playing {
  display: inline-flex; align-items: center; gap: .45rem;
}
.audio-pending.is-done .ap-done {
  display: inline-flex; align-items: center; gap: .45rem;
}

/* Spinner (loading state) */
.audio-spinner {
  display: inline-block;
  flex-shrink: 0;
  width: 14px;
  height: 14px;
  border: 2.5px solid rgba(91,141,238,.3);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin .7s linear infinite;
}
@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Playing state: pulsing glow on the badge */
.audio-pending.is-playing {
  animation: glowPulse 1.2s ease-in-out infinite;
}
@keyframes glowPulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(91,141,238,.55); }
  50%       { box-shadow: 0 0 0 7px rgba(91,141,238,.0); }
}

/* Done state: green */
.audio-pending.is-done {
  background: #d1fae5;
  color: #065f46;
}

/* ── Instructions ── */
.instruction-box {
  background: #f0f6ff;
  border-left: 4px solid var(--primary);
  border-radius: 8px;
  padding: .6rem 1rem;
  font-size: 1rem;
  min-height: 2.2rem;
  width: 100%;
  color: var(--text);
}

/* ── Feedback overlay ── */
.feedback {
  font-size: 1.4rem;
  font-weight: 700;
  padding: .75rem 2rem;
  border-radius: var(--radius);
  text-align: center;
  animation: fadeIn .3s ease;
}
.feedback.correct { background: #c8f7dc; color: #1a7a47; }
.feedback.wrong   { background: #ffd6d6; color: #c0392b; }

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-8px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── Phase dots ── */
.phase-dots {
  display: flex;
  gap: .6rem;
  justify-content: center;
  margin-top: .25rem;
}
.dot {
  width: 12px; height: 12px;
  border-radius: 50%;
  background: #cbd5e0;
  transition: background .3s;
}
.dot.active   { background: var(--primary); }
.dot.done     { background: var(--success); }

/* ── Complete screen ── */
#round-summary {
  font-size: 1rem;
  text-align: center;
  line-height: 1.8;
}
#round-summary .score-line { font-size: 1.15rem; }

/* ── Teacher page ── */
.teacher-main {
  max-width: 1100px;
  margin: 2rem auto;
  padding: 0 1.5rem;
}
.teacher-main h1 { font-size: 2rem; margin-bottom: .25rem; }
.subtitle { color: var(--muted); margin-bottom: 1.5rem; }

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin-bottom: 2rem;
}
.badge {
  padding: .3rem .9rem;
  border-radius: 999px;
  font-size: .85rem;
  font-weight: 600;
}

.level-section { margin-bottom: 2.5rem; }
.level-title {
  font-size: 1.2rem;
  color: var(--primary);
  border-bottom: 2px solid #e2e8f0;
  padding-bottom: .4rem;
  margin-bottom: 1rem;
  text-transform: capitalize;
}

.word-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: .75rem;
}

.word-card {
  background: var(--card-bg);
  border-radius: 12px;
  padding: .75rem .85rem;
  box-shadow: 0 2px 8px rgba(0,0,0,.07);
  position: relative;
  border-left: 4px solid #cbd5e0;
  transition: transform .15s;
}
.word-card:hover { transform: translateY(-2px); }
.wc-word  { font-size: 1.1rem; font-weight: 700; display: block; margin-bottom: .3rem; }
.wc-stats { font-size: .75rem; color: var(--muted); margin-top: .3rem; }
.wc-status-icon { position: absolute; top: .5rem; right: .6rem; font-size: .9rem; }

.wc-bar-wrap {
  background: #e2e8f0;
  border-radius: 999px;
  height: 6px;
  overflow: hidden;
}
.wc-bar {
  height: 100%;
  border-radius: 999px;
  background: var(--primary);
  transition: width .4s;
}

/* Status colours */
.status-learned     { border-left-color: var(--success); background: #f0fdf7; }
.status-learned   .wc-bar { background: var(--success); }
.status-learning    { border-left-color: var(--primary); }
.status-needs_work  { border-left-color: var(--danger); background: #fff5f5; }
.status-needs_work .wc-bar { background: var(--danger); }
.status-unseen      { border-left-color: #cbd5e0; }
.status-unseen    .wc-bar { background: #cbd5e0; }

/* Badge colours (legend) */
.badge.status-learned    { background: #c8f7dc; color: #1a7a47; }
.badge.status-learning   { background: #dbeafe; color: #1e4fd0; }
.badge.status-needs_work { background: #ffd6d6; color: #c0392b; }
.badge.status-unseen     { background: #e2e8f0; color: #4a5568; }

/* ── PIN screen ── */
.pin-hint {
  color: var(--muted);
  font-size: .95rem;
  text-align: center;
}
.pin-dots {
  display: flex;
  gap: .75rem;
  justify-content: center;
  margin: .5rem 0;
}
.pin-dot {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 2.5px solid var(--primary);
  background: transparent;
  transition: background .15s;
}
.pin-dot.filled {
  background: var(--primary);
}
.pin-keypad {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: .6rem;
  max-width: 260px;
  margin: .5rem auto;
}
.pin-key {
  background: #e8eef8;
  border: none;
  border-radius: 12px;
  font-size: 1.4rem;
  font-weight: 700;
  padding: .8rem 0;
  cursor: pointer;
  color: var(--text);
  transition: background .15s, transform .1s;
}
.pin-key:hover  { background: #d4e0f5; }
.pin-key:active { transform: scale(.95); }
.pin-key-ok {
  background: var(--primary);
  color: #fff;
}
.pin-key-ok:hover { background: var(--primary-d); }
.pin-key-clear { font-size: 1.1rem; }
.pin-error {
  color: var(--danger);
  font-weight: 600;
  text-align: center;
  font-size: .95rem;
}
.pin-input {
  max-width: 140px;
}

/* ── Student selector ── */
.student-select-wrap {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: .5rem;
  margin-bottom: .5rem;
}
.student-label {
  font-size: .9rem;
  font-weight: 600;
  color: var(--muted);
}
.student-row {
  display: flex;
  gap: .5rem;
  align-items: center;
  flex-wrap: wrap;
}
.student-select {
  flex: 1;
  min-width: 0;
  padding: .45rem .75rem;
  border: 2px solid #d0daf0;
  border-radius: 999px;
  font-size: 1rem;
  background: #fff;
  color: var(--text);
  outline: none;
  cursor: pointer;
}
.student-select:focus { border-color: var(--primary); }
.student-input {
  flex: 1;
  padding: .45rem .75rem;
  border: 2px solid #d0daf0;
  border-radius: 999px;
  font-size: .95rem;
  outline: none;
}
.student-input:focus { border-color: var(--primary); }
.new-student-form {
  display: flex;
  gap: .5rem;
  align-items: center;
  flex-wrap: wrap;
  margin-top: .25rem;
}
.btn-sm {
  font-size: .85rem !important;
  padding: .35rem 1rem !important;
}

/* ── Teacher student bar ── */
.teacher-student-bar {
  display: flex;
  align-items: center;
  gap: .75rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

/* ── PIN management (teacher page) ── */
.pin-manage-form {
  display: flex;
  align-items: center;
  gap: .5rem;
  flex-wrap: wrap;
  background: #f0f6ff;
  border: 1.5px solid #d0daf0;
  border-radius: 12px;
  padding: .6rem 1rem;
  margin-bottom: 1rem;
}
.pin-manage-msg {
  font-size: .9rem;
  font-weight: 600;
  margin-left: .25rem;
}

@media (max-width: 600px) {
  .sentence { font-size: 1.4rem; }
  .card { padding: 1.5rem 1rem; }
}