:root {
  --bg: #f6f6f2;
  --card: #ffffff;
  --ink: #1f2a2e;
  --accent: #4caf50;
  --accent-dark: #2f8f46;
  --muted: #6b7b83;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Gill Sans", "Candara", "Optima", "Trebuchet MS", sans-serif;
  background: radial-gradient(circle at top, #ffffff 0%, #f0f4ef 40%, #eaf1ea 100%);
  color: var(--ink);
}

.app {
  max-width: 900px;
  margin: 0 auto;
  padding: 32px 20px 60px;
}

.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 28px;
}

.brand {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: 0.5px;
}

.subtitle {
  color: var(--muted);
  font-size: 14px;
  margin-top: 4px;
}

.badge {
  background: #e6f5e9;
  color: var(--accent-dark);
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 600;
}

.card {
  background: var(--card);
  border-radius: 16px;
  padding: 24px;
  box-shadow: var(--shadow);
}

.lesson-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.home-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 18px;
}

.home-card {
  background: #ffffff;
  border-radius: 18px;
  padding: 22px;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 16px;
  border: 1px solid #e4ece7;
}

.home-card h2 {
  margin: 0 0 6px;
  font-size: 20px;
}

.home-cta {
  width: 100%;
}

.lesson-card {
  border: 1px solid #e4ece7;
  border-radius: 14px;
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  background: #fcfdfc;
}


.lesson-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 14px 30px rgba(0, 0, 0, 0.08);
}

.lesson-card.active {
  border-color: #2f8f46;
  background-color: #dcf4e3;
}

.lesson-card h3 {
  margin: 0;
  font-size: 18px;
}

.lesson-meta {
  color: var(--muted);
  font-size: 14px;
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 18px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.lesson-screen {
  display: grid;
  gap: 20px;
}

.btn {
  border: none;
  border-radius: 10px;
  padding: 10px 16px;
  font-weight: 600;
  cursor: pointer;
  background: var(--accent);
  color: white;
  transition: background 0.2s ease;
}

.btn:disabled {
  background: #b9c9bf;
  cursor: not-allowed;
}

.btn:hover:not(:disabled) {
  background: var(--accent-dark);
}

.btn-secondary {
  background: #e8efe9;
  color: var(--accent-dark);
}

.btn-secondary:hover:not(:disabled) {
  background: #dbe8dd;
}

.quiz-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.progress {
  color: var(--muted);
  font-weight: 600;
}

.word-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 12px;
  margin-bottom: 20px;
}

.word-item {
  padding: 10px 12px;
  background: #f4f9f4;
  border-radius: 10px;
  display: flex;
  justify-content: space-between;
  gap: 8px;
  font-weight: 600;
}

.word-main {
  font-size: 18px;
}

.word-sub {
  font-size: 12px;
  color: var(--muted);
}

.word-meaning {
  color: var(--muted);
  font-weight: 600;
}

.option-list {
  display: grid;
  gap: 10px;
  margin-top: 14px;
}

.option {
  border: 1px solid #dbe5dd;
  border-radius: 12px;
  padding: 12px 14px;
  cursor: pointer;
  background: #f9fbf9;
  font-weight: 600;
}

.option.selected {
  border-color: var(--accent);
  background: #e6f5e9;
}

.option.correct {
  border-color: #2f8f46;
  background: #dcf4e3;
}

.option.wrong {
  border-color: #c04b3c;
  background: #fbe7e4;
}

.match-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 16px;
}

.match-row {
  display: flex;
  align-items: center;
  gap: 10px;
  background: #f6faf6;
  padding: 10px;
  border-radius: 10px;
}

.match-row.correct {
  background: #dcf4e3;
  border: 1px solid #2f8f46;
}

.match-row.wrong {
  background: #fbe7e4;
  border: 1px solid #c04b3c;
}

.match-row select {
  flex: 1;
  padding: 8px;
  border-radius: 8px;
  border: 1px solid #d3dfd6;
  background: white;
}

.footer-actions {
  display: flex;
  justify-content: space-between;
  margin-top: 20px;
  flex-wrap: wrap;
  gap: 10px;
}

.score {
  font-size: 20px;
  font-weight: 700;
}

.result {
  font-size: 18px;
  font-weight: 700;
  margin-top: 10px;
}

.result-pass {
  color: var(--accent-dark);
}

.result-fail {
  color: #c04b3c;
}

.sentence-meaning {
  font-weight: 700;
  margin-bottom: 4px;
}

.sentence-nepali {
  color: var(--muted);
  margin-top: 0;
}

.sentence-hint {
  color: var(--muted);
  font-size: 13px;
}

.sentence-answer {
  min-height: 56px;
  border: 1px dashed #d1ddd5;
  border-radius: 12px;
  padding: 12px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  background: #f7fbf7;
  margin-bottom: 14px;
}

.sentence-placeholder {
  color: var(--muted);
  font-size: 14px;
}

.sentence-bank {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.word-chip {
  border: 1px solid #dbe5dd;
  background: #f9fbf9;
  padding: 8px 12px;
  border-radius: 999px;
  cursor: pointer;
  font-weight: 600;
}

.word-chip.correct {
  border-color: #2f8f46;
  background: #dcf4e3;
}

.word-chip.wrong {
  border-color: #c04b3c;
  background: #fbe7e4;
}

.solution {
  margin-top: 12px;
  padding: 10px 12px;
  border-radius: 12px;
  background: #f2f7f2;
  color: var(--ink);
}

.vocab-card {
  padding: 20px;
}

.vocab-search-row {
  display: flex;
  margin-bottom: 12px;
  padding: 10px;
  border: 1px solid #e4ece7;
  border-radius: 12px;
  background: #ffffff;
}

.vocab-tab {
  border: 1px solid #dbe5dd;
  background: #f9fbf9;
  border-radius: 999px;
  padding: 8px 12px;
  font-weight: 600;
  cursor: pointer;
}

.vocab-tab.active {
  border-color: var(--accent);
  background: #e6f5e9;
}

.vocab-search {
  padding: 8px 12px;
  border-radius: 10px;
  border: 1px solid #d3dfd6;
  font-weight: 600;
  background: #ffffff;
  width: 100%;
}

.vocab-category-box {
  border: 1px solid #e4ece7;
  border-radius: 12px;
  padding: 12px;
  background: #fafdfb;
  margin-bottom: 14px;
}

.vocab-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.vocab-main {
  display: grid;
  grid-template-columns: 0.4fr 0.6fr;
  gap: 14px;
}

.vocab-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-height: 440px;
  overflow: auto;
  padding-right: 6px;
  border: 1px solid #e4ece7;
  border-radius: 12px;
  padding: 12px;
  background: #ffffff;
}

.vocab-item {
  display: flex;
  align-items: center;
  border: 1px solid #dbe5dd;
  border-radius: 10px;
  padding: 8px 12px;
  background: #f9fbf9;
  cursor: pointer;
  font-weight: 600;
  text-align: left;
}

.vocab-item.active {
  border-color: var(--accent);
  background: #e6f5e9;
}

.vocab-detail {
  border: 1px solid #dbe5dd;
  border-radius: 12px;
  padding: 16px;
  background: #ffffff;
  min-height: 200px;
}

.vocab-word {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 6px;
}

.vocab-meaning {
  color: var(--muted);
  font-weight: 600;
  margin-bottom: 10px;
}

.vocab-example {
  font-size: 14px;
}

@media (max-width: 720px) {
  .match-grid {
    grid-template-columns: 1fr;
  }

  .header {
    flex-direction: column;
    align-items: flex-start;
  }

  .section-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .vocab-main {
    grid-template-columns: 1fr;
  }
}