@font-face {
  font-family: "Kalam";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("../fonts/Kalam-Regular.woff2") format("woff2");
}
@font-face {
  font-family: "Kalam";
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url("../fonts/Kalam-Bold.woff2") format("woff2");
}

:root {
  --navy: #1e3a5f;
  --navy-dark: #142943;
  --teal: #2f9e91;
  --teal-light: #e6f7f5;
  --ink: #1f2933;
  --muted: #5c6b7a;
  --border: #dfe4ea;
  --bg: #f6f8fa;
  --card: #ffffff;
  --danger: #c0392b;
  --danger-bg: #fdecea;
  --success: #1e7d4f;
  --success-bg: #e8f7ef;
  --board-green: #1f3b2c;
  --board-frame: #6b4226;
  --chalk: #f3efe0;
  --gold: #c9932f;
  --gold-bg: #fbf1dc;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, Verdana, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.55;
}

.app-header {
  background: var(--navy);
  color: #fff;
  position: sticky;
  top: 0;
  z-index: 10;
}

.app-header-inner {
  max-width: 900px;
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.app-title {
  font-weight: 600;
  font-size: 1.1rem;
  letter-spacing: 0.02em;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.save-status {
  font-size: 0.85rem;
  color: var(--teal-light);
  min-width: 60px;
  text-align: right;
}

.btn {
  font-size: 0.95rem;
  padding: 9px 16px;
  border-radius: 6px;
  border: 1px solid transparent;
  cursor: pointer;
  font-family: inherit;
}

.btn-save {
  background: var(--teal);
  color: #fff;
}
.btn-save:hover { background: #278276; }

.btn-primary {
  background: var(--navy);
  color: #fff;
}
.btn-primary:hover { background: var(--navy-dark); }

.btn-link {
  background: none;
  border: none;
  color: var(--navy);
  padding: 6px 0;
  font-weight: 600;
  text-decoration: underline;
}

.btn-icon {
  width: 34px;
  height: 34px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.35);
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
}
.btn-icon:hover { background: rgba(255, 255, 255, 0.18); }
.btn-icon svg { width: 17px; height: 17px; }

#app-main {
  max-width: 900px;
  margin: 0 auto;
  padding: 28px 20px 80px;
}

.view[hidden] { display: none; }

.subtitle { color: var(--muted); margin-top: -8px; }

/* Setup screen */
.setup-card {
  max-width: 480px;
  margin: 60px auto;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 32px;
  text-align: center;
}
.setup-error {
  color: var(--danger);
  background: var(--danger-bg);
  padding: 10px;
  border-radius: 6px;
  margin-top: 14px;
}

/* Name prompt */
.name-input {
  width: 100%;
  padding: 10px 12px;
  border-radius: 6px;
  border: 1px solid var(--border);
  font-size: 1rem;
  font-family: inherit;
  margin: 14px 0;
}
#name-form { display: flex; flex-direction: column; }

/* Home header + status pills (also used on the progress page) */
.home-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.status-pill {
  font-size: 0.78rem;
  padding: 4px 10px;
  border-radius: 999px;
  white-space: nowrap;
}
.status-not-started { background: #eef1f4; color: var(--muted); }
.status-in-progress { background: #fff4de; color: #8a5a00; }
.status-completed { background: var(--success-bg); color: var(--success); }
.status-locked { background: #eef1f4; color: var(--muted); }

/* Term path */
.path-list {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 22px;
}

.path-item { display: flex; width: 100%; }

.path-node {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  width: 160px;
  background: none;
  border: none;
  cursor: pointer;
  font-family: inherit;
  padding: 4px;
}
.path-node-left { margin-right: auto; }
.path-node-right { margin-left: auto; }

.path-node-circle {
  width: 58px;
  height: 58px;
  border-radius: 999px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.2rem;
  border: 3px solid var(--border);
  background: var(--card);
  color: var(--muted);
  transition: transform 0.15s ease;
}
.path-node-title {
  font-size: 0.82rem;
  text-align: center;
  color: var(--ink);
  line-height: 1.3;
}

.path-node:not(.status-locked):hover .path-node-circle { transform: scale(1.06); }

.path-node.status-not-started .path-node-circle { border-color: var(--teal); color: var(--teal); }
.path-node.status-in-progress .path-node-circle { border-color: var(--teal); background: var(--teal); color: #fff; }
.path-node.status-completed .path-node-circle { border-color: var(--gold); background: var(--gold); color: #fff; }
.path-node.status-locked { cursor: pointer; opacity: 0.55; }
.path-node.status-locked .path-node-circle { border-style: dashed; }

/* My Progress page */
.progress-summary {
  display: flex;
  gap: 16px;
  margin: 18px 0 24px;
}
.progress-stat {
  flex: 1;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  text-align: center;
}
.progress-stat-value { display: block; font-size: 1.8rem; font-weight: 700; color: var(--navy); }
.progress-stat-label { display: block; font-size: 0.8rem; color: var(--muted); margin-top: 2px; }

.progress-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.progress-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 16px;
}
.progress-row-title { font-weight: 600; flex: 1; }
.progress-row-score { color: var(--muted); font-size: 0.9rem; white-space: nowrap; }

/* Toast */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(10px);
  background: var(--navy-dark);
  color: #fff;
  padding: 10px 18px;
  border-radius: 999px;
  font-size: 0.88rem;
  opacity: 0;
  transition: opacity 0.25s ease, transform 0.25s ease;
  z-index: 60;
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
}
.toast.toast-visible { opacity: 1; transform: translateX(-50%) translateY(0); }

/* Progress bar (lesson steps) */
.progress-bar-wrap {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 14px 0 22px;
}
.progress-bar {
  flex: 1;
  height: 8px;
  background: #e4e9ee;
  border-radius: 999px;
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  background: var(--teal);
  border-radius: 999px;
  transition: width 0.3s ease;
  width: 0%;
}
.progress-label {
  font-size: 0.82rem;
  color: var(--muted);
  white-space: nowrap;
}

/* Step card (lesson + exercises) */
.step-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 24px 26px;
  min-height: 200px;
}
.step-card.step-enter { animation: stepIn 0.28s ease; }
@keyframes stepIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.step-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 4px;
}
.step-icon {
  flex: none;
  width: 34px;
  height: 34px;
  border-radius: 999px;
  background: var(--teal-light);
  color: var(--teal);
  display: flex;
  align-items: center;
  justify-content: center;
}
.step-icon svg { width: 19px; height: 19px; }
.step-header h1 { font-size: 1.3rem; margin: 0; }

.step-subtitle { color: var(--muted); font-size: 0.85rem; margin-top: -4px; }
.lesson-meta { color: var(--muted); margin-top: -4px; }

.checklist { padding-left: 22px; margin: 10px 0 0; }
.checklist li { margin-bottom: 8px; }

.step-nav {
  display: flex;
  justify-content: space-between;
  margin-top: 18px;
}
.step-nav .btn-primary { margin-left: auto; }

/* Vocabulary flip cards */
.vocab-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 10px;
  margin-top: 14px;
}
.vocab-card {
  background: var(--teal-light);
  border: 1px solid transparent;
  border-radius: 8px;
  padding: 16px 12px;
  min-height: 64px;
  font-weight: 600;
  color: var(--navy);
  cursor: pointer;
  font-family: inherit;
  font-size: 0.92rem;
  text-align: center;
  transition: background 0.15s ease;
}
.vocab-card:hover { border-color: var(--teal); }
.vocab-card.flipped {
  background: var(--navy);
  color: #fff;
  font-weight: 400;
  text-align: left;
}

/* Worked examples with progressive reveal */
.worked-example {
  background: var(--teal-light);
  border-left: 4px solid var(--teal);
  border-radius: 4px;
  padding: 12px 16px;
  margin: 14px 0;
}
.worked-example-problem { font-weight: 600; margin: 0 0 6px; }
.reveal-steps { margin: 8px 0; padding-left: 22px; }
.reveal-steps li { margin-bottom: 6px; animation: stepIn 0.25s ease; }
.btn-secondary {
  background: #fff;
  border: 1px solid var(--teal);
  color: var(--teal);
  font-weight: 600;
}
.btn-secondary:hover { background: var(--teal-light); }
.btn-secondary:disabled { opacity: 0.6; cursor: default; }

/* Misconceptions */
.misconception-card {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  background: var(--danger-bg);
  border-radius: 8px;
  padding: 12px 14px;
  margin-top: 12px;
}
.misconception-icon { flex: none; width: 20px; height: 20px; color: var(--danger); margin-top: 2px; }
.misconception-icon svg { width: 20px; height: 20px; }
.misconception-card p { margin: 0; }

/* Guided practice */
.practice-card {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 16px;
  margin-top: 12px;
}
.practice-question { font-weight: 600; margin: 0 0 8px; }
.practice-answer {
  background: var(--success-bg);
  color: var(--success);
  border-radius: 6px;
  padding: 8px 10px;
  margin: 8px 0;
}

/* Exercise progress dots */
.exercise-dots {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin: 14px 0 22px;
}
.dot {
  width: 26px;
  height: 26px;
  border-radius: 999px;
  border: 2px solid var(--border);
  background: #fff;
  cursor: pointer;
  padding: 0;
}
.dot:disabled { cursor: default; opacity: 0.6; }
.dot-current { border-color: var(--navy); }
.dot-correct { background: var(--success-bg); border-color: var(--success); }
.dot-incorrect { background: var(--danger-bg); border-color: var(--danger); }

.exercise-question { font-weight: 600; margin: 4px 0 16px; font-size: 1.05rem; }

.exercise-subtitle-row { display: flex; align-items: center; flex-wrap: wrap; gap: 4px; }

.number-line-row { margin-bottom: 8px; }

.exercise-options {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.option-btn {
  text-align: left;
  padding: 10px 14px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: #fff;
  cursor: pointer;
  font-family: inherit;
  font-size: 0.95rem;
}
.option-btn:hover { border-color: var(--teal); }
.option-btn.selected { border-color: var(--navy); }
.option-btn.correct { background: var(--success-bg); border-color: var(--success); color: var(--success); }
.option-btn.incorrect { background: var(--danger-bg); border-color: var(--danger); color: var(--danger); }
.option-btn:disabled { cursor: default; }
.option-btn.correct.bounce-pop { animation: bouncePop 0.4s ease; }
.option-btn.incorrect.shake-anim { animation: shake 0.4s ease; }

@keyframes bouncePop {
  0% { transform: scale(1); }
  35% { transform: scale(1.06); }
  65% { transform: scale(0.97); }
  100% { transform: scale(1); }
}
@keyframes shake {
  10%, 90% { transform: translateX(-2px); }
  20%, 80% { transform: translateX(4px); }
  30%, 50%, 70% { transform: translateX(-6px); }
  40%, 60% { transform: translateX(6px); }
}

.exercise-feedback {
  margin-top: 10px;
  padding: 10px 12px;
  border-radius: 6px;
  font-size: 0.92rem;
}
.exercise-feedback.correct { background: var(--success-bg); color: var(--success); }
.exercise-feedback.incorrect { background: var(--danger-bg); color: var(--danger); }
.exercise-feedback.retry-hint { background: var(--gold-bg); color: var(--gold); }
.exercise-feedback.feedback-pop { animation: feedbackPop 0.3s ease; }
@keyframes feedbackPop {
  0% { transform: scale(0.96); opacity: 0; }
  100% { transform: scale(1); opacity: 1; }
}

.next-question-btn { margin-top: 16px; }

/* Results */
.results-card { text-align: center; }
.results-card .step-header { justify-content: center; }

.score-ring-wrap {
  position: relative;
  width: 168px;
  height: 168px;
  margin: 14px auto 6px;
}
.score-ring-wrap svg { width: 100%; height: 100%; transform: rotate(-90deg); }
.score-ring-track { fill: none; stroke: #e4e9ee; stroke-width: 10; }
.score-ring-fill {
  fill: none;
  stroke: var(--teal);
  stroke-width: 10;
  stroke-linecap: round;
  transition: stroke-dashoffset 1s cubic-bezier(0.25, 0.9, 0.35, 1);
}
.score-ring-value {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  font-weight: 700;
  color: var(--navy);
}
.score-ring-value.grow-spin { animation: growSpin 0.5s cubic-bezier(0.25, 0.9, 0.35, 1); }

.perfect-badge {
  display: inline-block;
  background: var(--gold-bg);
  color: var(--gold);
  font-weight: 700;
  padding: 6px 16px;
  border-radius: 999px;
  margin: 4px 0 14px;
}
.perfect-badge.grow-spin { animation: growSpin 0.5s cubic-bezier(0.25, 0.9, 0.35, 1) 0.15s backwards; }

@keyframes growSpin {
  from { transform: scale(0.4) rotate(-12deg); opacity: 0; }
  to { transform: scale(1) rotate(0deg); opacity: 1; }
}

.results-message { color: var(--muted); margin-bottom: 20px; }
.results-actions {
  display: flex;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
}

/* Streak counter */
.streak-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 0.82rem;
  font-weight: 600;
  color: #b3641f;
  background: #fff2e2;
  padding: 3px 10px;
  border-radius: 999px;
  margin-left: 10px;
}
.streak-badge svg { width: 13px; height: 13px; }

/* Confetti */
.confetti-container {
  position: fixed;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  z-index: 50;
}
.confetti-piece {
  position: absolute;
  top: -12px;
  width: 8px;
  height: 14px;
  opacity: 0.9;
  animation-name: confettiFall;
  animation-timing-function: cubic-bezier(0.4, 0.1, 0.7, 1);
  animation-fill-mode: forwards;
}
@keyframes confettiFall {
  from { transform: translateY(0) rotate(0deg); opacity: 1; }
  to { transform: translateY(105vh) rotate(600deg); opacity: 0.4; }
}

/* Chalkboard (worked examples) */
.worked-example-actions { margin-top: 10px; }

.chalkboard-wrap { perspective: 900px; margin-top: 14px; }

.chalkboard {
  background: var(--board-green);
  border: 10px solid var(--board-frame);
  border-radius: 6px;
  padding: 18px 20px;
  box-shadow: 0 8px 18px rgba(0, 0, 0, 0.18);
  transform-origin: top center;
}
.chalkboard.flip-in { animation: chalkFlip 0.45s ease; }
@keyframes chalkFlip {
  from { transform: rotateX(-90deg); opacity: 0.2; }
  to { transform: rotateX(0deg); opacity: 1; }
}

.chalk-text {
  font-family: "Kalam", "Segoe Script", "Segoe Print", cursive;
  color: var(--chalk);
  font-size: 1.15rem;
  line-height: 1.6;
  margin: 0 0 10px;
  min-height: 1.6em;
}
.chalk-cursor {
  display: inline-block;
  width: 2px;
  margin-left: 1px;
  background: var(--chalk);
  animation: chalkBlink 0.8s step-end infinite;
}
@keyframes chalkBlink {
  50% { opacity: 0; }
}

.chalkboard-continue-btn {
  background: transparent;
  border: 1px solid rgba(243, 239, 224, 0.5);
  color: var(--chalk);
  font-weight: 600;
  border-radius: 6px;
  padding: 8px 16px;
  cursor: pointer;
  font-family: inherit;
  margin-top: 6px;
}
.chalkboard-continue-btn:hover { background: rgba(243, 239, 224, 0.12); }
.chalkboard-continue-btn:disabled { opacity: 0.5; cursor: default; }

.chalkboard-alt-toggle { margin-top: 12px; }

/* Column arithmetic (chalkboard Tier B) */
.column-math {
  display: inline-flex;
  flex-direction: column;
  align-items: flex-end;
  font-family: "Consolas", "Courier New", monospace;
  color: var(--chalk);
  font-size: 1.4rem;
  letter-spacing: 0.05em;
  margin: 10px 0;
}
.column-math-row { display: flex; }
.column-math-cell {
  width: 1.5em;
  text-align: center;
  position: relative;
}
.column-math-cell.op-cell { text-align: left; width: 1.2em; }
.column-math-carry {
  position: absolute;
  top: -1.1em;
  left: 0;
  right: 0;
  font-size: 0.55em;
  color: #f5c56b;
  text-align: center;
}
.column-math-borrow {
  position: absolute;
  top: -1.1em;
  left: 0;
  right: 0;
  font-size: 0.55em;
  color: #f08a6c;
  text-align: center;
  text-decoration: line-through;
}
.column-math-rule { border-top: 2px solid var(--chalk); margin: 2px 0; }
.column-math-cell.active { background: rgba(243, 239, 224, 0.15); border-radius: 4px; }

/* Number line (chalkboard Tier B, rounding) */
.number-line-wrap { margin: 16px 0 6px; }
.number-line-wrap svg { width: 100%; height: 90px; overflow: visible; }
.number-line-track { stroke: var(--chalk); stroke-width: 2; }
.number-line-tick { stroke: var(--chalk); stroke-width: 2; }
.number-line-label {
  fill: var(--chalk);
  font-family: "Consolas", "Courier New", monospace;
  font-size: 13px;
  text-anchor: middle;
}
.number-line-point {
  fill: #f5c56b;
  transition: cx 1s cubic-bezier(0.25, 0.9, 0.35, 1);
}
.number-line-point-label {
  fill: #f5c56b;
  font-family: "Kalam", cursive;
  font-size: 15px;
  font-weight: 700;
  text-anchor: middle;
  transition: x 1s cubic-bezier(0.25, 0.9, 0.35, 1);
}