/* ===========================
   保育士試験 一問一答 - style.css
=========================== */

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

:root {
  --c-bg: #f5f3ef;
  --c-surface: #ffffff;
  --c-primary: #2c5f7a;
  --c-primary-dark: #1e4560;
  --c-primary-light: #d6e8f0;
  --c-accent: #8b6914;
  --c-correct: #2e7d52;
  --c-correct-bg: #e8f5ee;
  --c-wrong: #b94040;
  --c-wrong-bg: #faeaea;
  --c-text: #2a2a2a;
  --c-text-sub: #666;
  --c-border: #ddd;
  --radius: 12px;
  --shadow: 0 4px 20px rgba(0,0,0,0.08);
}

body {
  font-family: 'Noto Sans JP', sans-serif;
  background: var(--c-bg);
  color: var(--c-text);
  min-height: 100vh;
}

/* ---- Screens ---- */
.screen { display: none; min-height: 100vh; }
.screen.active { display: block; }

/* ===== START SCREEN ===== */
.app-header {
  background: var(--c-primary);
  color: #fff;
  text-align: center;
  padding: 40px 20px 32px;
}
.app-title {
  font-family: 'Noto Serif JP', serif;
  font-size: 1.8rem;
  font-weight: 600;
  letter-spacing: 0.05em;
}
.app-title span {
  display: block;
  font-size: 1.1rem;
  font-weight: 400;
  margin-top: 4px;
  opacity: 0.85;
}
.app-subtitle {
  margin-top: 8px;
  font-size: 0.8rem;
  opacity: 0.7;
  letter-spacing: 0.08em;
}

.start-main {
  max-width: 680px;
  margin: 0 auto;
  padding: 28px 16px 60px;
}

/* Subject grid */
.subject-section h2,
.history-section h2 {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--c-text-sub);
  text-transform: uppercase;
  margin-bottom: 12px;
}
.subject-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 32px;
}
.subject-btn {
  padding: 8px 16px;
  border-radius: 20px;
  border: 2px solid var(--c-border);
  background: var(--c-surface);
  color: var(--c-text);
  font-family: inherit;
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.2s;
}
.subject-btn:hover { border-color: var(--c-primary); color: var(--c-primary); }
.subject-btn.active {
  background: var(--c-primary);
  border-color: var(--c-primary);
  color: #fff;
  font-weight: 500;
}

/* History */
.history-section { margin-bottom: 32px; }
.history-stats {
  display: flex;
  gap: 12px;
  margin-bottom: 12px;
}
.stat-box {
  flex: 1;
  background: var(--c-surface);
  border-radius: var(--radius);
  padding: 14px 10px;
  text-align: center;
  box-shadow: var(--shadow);
}
.stat-num {
  display: block;
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--c-primary);
}
.stat-label {
  display: block;
  font-size: 0.7rem;
  color: var(--c-text-sub);
  margin-top: 2px;
}

/* Buttons */
.btn-primary {
  display: block;
  width: 100%;
  padding: 16px;
  background: var(--c-primary);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-family: inherit;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.2s;
  letter-spacing: 0.05em;
}
.btn-primary:hover { background: var(--c-primary-dark); }

.btn-secondary {
  display: block;
  width: 100%;
  padding: 14px;
  background: var(--c-surface);
  color: var(--c-primary);
  border: 2px solid var(--c-primary);
  border-radius: var(--radius);
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s;
  margin-top: 10px;
  letter-spacing: 0.05em;
}
.btn-secondary:hover { background: var(--c-primary-light); }

.btn-ghost {
  display: block;
  width: 100%;
  padding: 10px;
  background: transparent;
  color: var(--c-text-sub);
  border: none;
  font-family: inherit;
  font-size: 0.8rem;
  cursor: pointer;
  text-decoration: underline;
  margin-top: 8px;
}

.start-actions { margin-top: 8px; }

/* ===== QUIZ SCREEN ===== */
.quiz-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px 0;
  max-width: 720px;
  margin: 0 auto;
}
.btn-back {
  background: none;
  border: none;
  font-family: inherit;
  font-size: 0.85rem;
  color: var(--c-primary);
  cursor: pointer;
  padding: 6px 0;
}
.quiz-meta { text-align: right; }
.quiz-subject {
  display: block;
  font-size: 0.7rem;
  color: var(--c-text-sub);
  margin-bottom: 2px;
}
.quiz-progress {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--c-primary);
}

.progress-bar-wrap {
  height: 4px;
  background: var(--c-border);
  max-width: 720px;
  margin: 10px auto 0;
}
.progress-bar {
  height: 100%;
  background: var(--c-primary);
  transition: width 0.3s ease;
}

.card-wrap {
  max-width: 720px;
  margin: 20px auto;
  padding: 0 16px 60px;
}
.card {
  background: var(--c-surface);
  border-radius: 16px;
  box-shadow: var(--shadow);
  padding: 28px 24px;
}
.card-question {
  font-family: 'Noto Serif JP', serif;
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--c-text);
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--c-border);
}

/* Choices */
.choices { display: flex; flex-direction: column; gap: 10px; }
.choice-btn {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  width: 100%;
  padding: 14px 16px;
  background: var(--c-bg);
  border: 2px solid transparent;
  border-radius: 10px;
  font-family: inherit;
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--c-text);
  cursor: pointer;
  text-align: left;
  transition: all 0.15s;
}
.choice-btn:hover:not(:disabled) {
  border-color: var(--c-primary);
  background: var(--c-primary-light);
}
.choice-btn .choice-label {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--c-primary);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}
.choice-btn.correct {
  background: var(--c-correct-bg);
  border-color: var(--c-correct);
}
.choice-btn.correct .choice-label { background: var(--c-correct); }
.choice-btn.wrong {
  background: var(--c-wrong-bg);
  border-color: var(--c-wrong);
}
.choice-btn.wrong .choice-label { background: var(--c-wrong); }
.choice-btn:disabled { cursor: default; }

/* Answer area */
.card-answer { margin-top: 24px; padding-top: 20px; border-top: 1px solid var(--c-border); }
.card-answer.hidden { display: none; }

.answer-badge {
  display: inline-block;
  padding: 6px 20px;
  border-radius: 20px;
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 12px;
}
.answer-badge.correct-badge { background: var(--c-correct-bg); color: var(--c-correct); }
.answer-badge.wrong-badge { background: var(--c-wrong-bg); color: var(--c-wrong); }

.answer-correct-label {
  font-size: 0.8rem;
  color: var(--c-text-sub);
  margin-bottom: 12px;
  font-weight: 500;
}
.answer-explanation {
  font-size: 0.88rem;
  line-height: 1.8;
  color: var(--c-text);
  background: #faf9f6;
  border-left: 3px solid var(--c-accent);
  padding: 12px 14px;
  border-radius: 0 8px 8px 0;
  margin-bottom: 20px;
}

.btn-next {
  display: block;
  width: 100%;
  padding: 14px;
  background: var(--c-primary);
  color: #fff;
  border: none;
  border-radius: 10px;
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.2s;
}
.btn-next:hover { background: var(--c-primary-dark); }

/* ===== RESULT SCREEN ===== */
.result-wrap {
  max-width: 480px;
  margin: 0 auto;
  padding: 40px 16px 60px;
  text-align: center;
}
.result-title {
  font-family: 'Noto Serif JP', serif;
  font-size: 1.4rem;
  margin-bottom: 28px;
  color: var(--c-primary);
}
.score-circle {
  position: relative;
  width: 160px;
  margin: 0 auto 20px;
}
.score-circle svg { transform: rotate(-90deg); width: 160px; height: 160px; }
.score-bg { fill: none; stroke: var(--c-border); stroke-width: 10; }
.score-fill {
  fill: none;
  stroke: var(--c-primary);
  stroke-width: 10;
  stroke-linecap: round;
  stroke-dasharray: 326.7;
  stroke-dashoffset: 326.7;
  transition: stroke-dashoffset 1s ease;
}
.score-text {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}
.score-num { font-size: 2.4rem; font-weight: 700; color: var(--c-primary); }
.score-denom { font-size: 0.9rem; color: var(--c-text-sub); }

.score-rate {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--c-primary);
  margin-bottom: 8px;
}
.score-comment {
  font-size: 0.9rem;
  color: var(--c-text-sub);
  margin-bottom: 32px;
}

.result-actions { display: flex; flex-direction: column; gap: 10px; margin-bottom: 32px; }

.btn-twitter-share {
  display: block;
  width: 100%;
  padding: 12px;
  background: #000;
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
  letter-spacing: 0.03em;
  transition: background 0.2s;
}
.btn-twitter-share:hover { background: #333; }

.wrong-list-wrap {
  text-align: left;
  background: var(--c-surface);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
}
.wrong-list-wrap h3 {
  font-size: 0.85rem;
  color: var(--c-text-sub);
  margin-bottom: 12px;
  letter-spacing: 0.05em;
}
.wrong-item {
  padding: 10px 0;
  border-bottom: 1px solid var(--c-border);
  font-size: 0.85rem;
  line-height: 1.6;
}
.wrong-item:last-child { border-bottom: none; }
.wrong-item-subject {
  font-size: 0.7rem;
  color: var(--c-wrong);
  font-weight: 700;
  margin-bottom: 2px;
}

/* ===== REPORT BUTTON ===== */
.btn-report {
  display: block;
  width: 100%;
  margin-top: 10px;
  padding: 9px;
  background: transparent;
  border: 1px solid var(--c-border);
  border-radius: 8px;
  font-family: inherit;
  font-size: 0.78rem;
  color: var(--c-text-sub);
  cursor: pointer;
  transition: all 0.15s;
}
.btn-report:hover { border-color: var(--c-wrong); color: var(--c-wrong); }

/* ===== FOOTER ===== */
.app-footer {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  text-align: center;
  padding: 8px;
  background: var(--c-bg);
  border-top: 1px solid var(--c-border);
}
.btn-disclaimer {
  background: none;
  border: none;
  font-family: inherit;
  font-size: 0.75rem;
  color: var(--c-text-sub);
  cursor: pointer;
  text-decoration: underline;
}
.footer-privacy-link {
  display: inline-block;
  margin-left: 16px;
  font-size: 0.75rem;
  color: var(--c-text-sub);
  text-decoration: underline;
}

/* ===== MODALS ===== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.45);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 16px;
}
.modal-overlay.hidden { display: none; }
.modal {
  background: var(--c-surface);
  border-radius: 16px;
  padding: 28px 24px;
  max-width: 480px;
  width: 100%;
  max-height: 80vh;
  overflow-y: auto;
}
.modal-title {
  font-family: 'Noto Serif JP', serif;
  font-size: 1.1rem;
  margin-bottom: 16px;
  color: var(--c-primary);
}
.modal-body p {
  font-size: 0.85rem;
  line-height: 1.8;
  color: var(--c-text);
  margin-bottom: 12px;
}
.btn-modal-close {
  display: block;
  width: 100%;
  margin-top: 16px;
  padding: 12px;
  background: var(--c-primary);
  color: #fff;
  border: none;
  border-radius: 10px;
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
}
.report-question-preview {
  font-size: 0.82rem;
  color: var(--c-text-sub);
  background: var(--c-bg);
  padding: 10px 12px;
  border-radius: 8px;
  margin-bottom: 14px;
  line-height: 1.6;
}
.report-label {
  display: block;
  font-size: 0.8rem;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--c-text);
}
.report-textarea {
  width: 100%;
  height: 90px;
  padding: 10px 12px;
  border: 1px solid var(--c-border);
  border-radius: 8px;
  font-family: inherit;
  font-size: 0.85rem;
  resize: vertical;
}
.modal-actions { display: flex; flex-direction: column; gap: 8px; margin-top: 16px; }

/* ===== RESPONSIVE ===== */
@media (max-width: 480px) {
  .app-title { font-size: 1.5rem; }
  .card { padding: 20px 16px; }
  .card-question { font-size: 0.95rem; }
  .choice-btn { font-size: 0.85rem; padding: 12px 12px; }
}