:root {
  --bg-white: #ffffff;
  --text-black: #000000;
  --border-color: #cccccc;

  --blue: #1d4ed8;
  --blue-light: #eff6ff;

  --orange: #ea580c;
  --orange-light: #fff7ed;

  --green: #16a34a;
  --green-light: #dcfce7;

  --red: #dc2626;
  --red-light: #fee2e2;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--bg-white);
  color: var(--text-black);
  font-family: Arial, "Noto Sans KR", sans-serif;
  line-height: 1.5;
}

.container {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 16px;
}

.hidden {
  display: none !important;
}

/* Header */
.site-header {
  border-bottom: 2px solid var(--blue);
  padding: 14px 0;
  background-color: var(--bg-white);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
  cursor: pointer;
}

.brand-kr {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--orange);
}

.brand-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-black);
}

/* Main Content */
.main-content {
  padding: 24px 16px 48px;
}

.intro-text {
  margin-bottom: 20px;
  font-size: 1rem;
  color: var(--text-black);
}

.section-box {
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 20px;
  margin-bottom: 20px;
  background-color: var(--bg-white);
}

.section-box h2 {
  font-size: 1.2rem;
  margin-bottom: 14px;
  color: var(--text-black);
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.section-header h2 {
  margin-bottom: 0;
}

.form-group {
  margin-bottom: 18px;
}

.form-label {
  display: block;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-black);
}

.muted-note {
  font-weight: 400;
  font-size: 0.9rem;
}

/* Chapters Grid */
.chapters-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 8px;
}

.chapter-option {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  cursor: pointer;
  user-select: none;
  color: var(--text-black);
}

.chapter-option.selected {
  border-color: var(--blue);
  background-color: var(--blue-light);
}

.chapter-option input[type="checkbox"] {
  accent-color: var(--blue);
  width: 16px;
  height: 16px;
  cursor: pointer;
}

.count-row {
  display: flex;
  align-items: center;
  gap: 12px;
}

.count-row .form-label {
  margin-bottom: 0;
}

.input-number,
.input-text {
  padding: 8px 10px;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  font-size: 1rem;
  color: var(--text-black);
  background-color: var(--bg-white);
}

.input-number {
  width: 90px;
}

/* Buttons */
.btn {
  padding: 8px 16px;
  font-size: 0.95rem;
  font-weight: 700;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-family: inherit;
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.btn-large {
  padding: 10px 22px;
  font-size: 1rem;
}

.btn-blue {
  background-color: var(--blue);
  color: var(--bg-white);
}

.btn-orange {
  background-color: var(--orange);
  color: var(--bg-white);
}

.btn-green {
  background-color: var(--green);
  color: var(--bg-white);
}

.error-msg {
  color: var(--red);
  font-size: 0.9rem;
  margin-top: 6px;
}

/* Scoring Chart Table */
.chart-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}

.chart-table th,
.chart-table td {
  text-align: left;
  padding: 8px 10px;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-black);
}

.chart-table th {
  border-bottom: 2px solid var(--orange);
  font-weight: 700;
}

.empty-state {
  color: var(--text-black);
  padding: 8px 0;
}

/* Flashcard Quiz */
.quiz-top-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 14px;
  font-weight: 700;
}

.counter-text {
  color: var(--text-black);
}

.chapter-text {
  color: var(--orange);
}

.flashcard-stage {
  border: 2px solid var(--blue);
  border-radius: 6px;
  padding: 36px 20px;
  text-align: center;
  margin-bottom: 18px;
}

.flashcard-korean-word {
  font-size: 2.4rem;
  font-weight: 700;
  color: var(--text-black);
}

.options-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-bottom: 16px;
}

@media (max-width: 560px) {
  .options-grid {
    grid-template-columns: 1fr;
  }
}

.option-box {
  padding: 14px;
  border: 2px solid var(--border-color);
  border-radius: 4px;
  background-color: var(--bg-white);
  color: var(--text-black);
  font-size: 1rem;
  text-align: left;
  cursor: pointer;
  font-family: inherit;
}

.option-box:hover:not(.locked) {
  border-color: var(--blue);
}

.option-box.selected:not(.correct):not(.wrong) {
  border-color: var(--orange);
  background-color: var(--orange-light);
  font-weight: 700;
}

.option-box.correct {
  background-color: var(--green-light) !important;
  border-color: var(--green) !important;
  color: var(--text-black) !important;
  font-weight: 700;
}

.option-box.wrong {
  background-color: var(--red-light) !important;
  border-color: var(--red) !important;
  color: var(--text-black) !important;
  font-weight: 700;
}

.option-box.locked {
  cursor: default;
}

.feedback-banner {
  padding: 10px 14px;
  border-radius: 4px;
  margin-bottom: 16px;
  font-weight: 700;
  color: var(--text-black);
}

.feedback-banner.feedback-correct {
  background-color: var(--green-light);
  border: 1px solid var(--green);
}

.feedback-banner.feedback-wrong {
  background-color: var(--red-light);
  border: 1px solid var(--red);
}

.feedback-banner.feedback-skipped {
  background-color: var(--orange-light);
  border: 1px solid var(--orange);
}

.quiz-actions {
  display: flex;
  gap: 10px;
}

.quiz-actions .btn {
  flex: 1;
}

/* Results View */
.score-line {
  font-size: 1.15rem;
  margin-bottom: 18px;
}

.save-score-form {
  margin-bottom: 18px;
}

.save-score-row {
  display: flex;
  gap: 8px;
  max-width: 360px;
}

.save-score-row .input-text {
  flex: 1;
}

.save-score-msg {
  margin-top: 8px;
  font-weight: 700;
}

.results-word-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.word-review-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 14px;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  background-color: var(--bg-white);
  color: var(--text-black);
  cursor: pointer;
  text-align: left;
  font-size: 0.98rem;
  font-family: inherit;
}

.word-review-item:hover {
  border-color: var(--blue);
}

.word-status-correct {
  color: var(--green);
  font-weight: 700;
}

.word-status-wrong {
  color: var(--red);
  font-weight: 700;
}

.word-status-skipped {
  color: var(--orange);
  font-weight: 700;
}

/* Review Header */
.review-nav-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-color);
}

.locked-label {
  font-weight: 700;
  color: var(--orange);
}