/* ============================================================
   quiz.css — 测验模块
   （斐波那契教学页面 · 样式封装 part 5）
   ============================================================ */

.quiz-box {
  max-width: 680px;
  margin: 0 auto;
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 34px;
  box-shadow: var(--shadow);
}
.quiz-q {
  font-size: 1.2rem; font-weight: 700; margin-bottom: 20px; min-height: 55px;
  display: flex; align-items: center; gap: 12px;
}
/* 题目前的小序号圆徽 */
.quiz-q .q-num {
  flex-shrink: 0;
  width: 34px; height: 34px;
  display: grid; place-items: center;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--teal), var(--purple));
  color: #0f1524; font-weight: 800; font-size: 0.95rem;
  box-shadow: 0 4px 14px rgba(45,212,191,0.3);
}
/* 顶部进度指示器 */
.quiz-progress {
  display: flex; align-items: center; gap: 12px;
  margin-bottom: 20px;
}
.quiz-progress-track {
  flex: 1; height: 6px; border-radius: 50px;
  background: var(--bg-2);
  border: 1px solid var(--card-border);
  overflow: hidden;
}
.quiz-progress-fill {
  width: 0%; height: 100%;
  border-radius: 50px;
  background: var(--teal);
  transition: width 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}
.quiz-progress-label {
  font-size: 0.85rem; font-weight: 700; color: var(--muted);
  letter-spacing: 1px; white-space: nowrap; min-width: 52px; text-align: right;
}
.quiz-options { display: grid; gap: 12px; }
.quiz-opt {
  position: relative;
  text-align: left;
  padding: 16px 20px;
  border-radius: 14px;
  background: var(--bg-2);
  border: 1px solid var(--card-border);
  color: var(--text);
  font-size: 1rem;
  cursor: pointer;
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease, background 0.25s ease, opacity 0.3s ease;
  font-family: inherit;
  overflow: hidden;
}
/* 悬停浮起 + 柔和金色光晕 */
.quiz-opt:hover:not(:disabled) {
  border-color: var(--gold-1);
  transform: translateX(6px);
  box-shadow: 0 8px 24px rgba(251,191,36,0.18), 0 0 0 1px rgba(251,191,36,0.15);
}
/* 左上角的选项字母 A/B/C/D */
.quiz-opt .opt-key {
  display: inline-flex; align-items: center; justify-content: center;
  width: 26px; height: 26px; margin-right: 12px;
  border-radius: 8px;
  background: rgba(167,139,250,0.16);
  border: 1px solid rgba(167,139,250,0.25);
  color: var(--purple);
  font-weight: 800; font-size: 0.85rem;
  transition: background 0.25s, color 0.25s, border-color 0.25s;
  vertical-align: middle;
}
.quiz-opt:hover:not(:disabled) .opt-key {
  background: rgba(251,191,36,0.18);
  border-color: var(--gold-1);
  color: var(--gold-1);
}
/* 正确：沿用青绿色主题，仅用绿色 ✓ 标记突出对错 */
.quiz-opt.correct {
  background: rgba(45,212,191,0.22);
  border-color: var(--teal);
  box-shadow: 0 0 0 2px rgba(45,212,191,0.25), 0 8px 22px rgba(45,212,191,0.15);
  color: var(--text);
  font-weight: 700;
  transform: none;
}
.quiz-opt.correct::after {
  content: '✓';
  position: absolute; right: 18px; top: 50%;
  transform: translateY(-50%);
  font-weight: 900;
  color: #22c55e;
  font-size: 1.25rem;
  text-shadow: 0 0 12px rgba(34,197,94,0.5);
}
.quiz-opt.correct .opt-key {
  background: rgba(45,212,191,0.25);
  border-color: var(--teal);
  color: var(--teal);
}
/* 选对时的吸入弹跳动画 */
.quiz-opt.pop-correct { animation: popCorrect 0.5s cubic-bezier(0.34, 1.56, 0.64, 1); }
@keyframes popCorrect {
  0% { transform: scale(1); }
  45% { transform: scale(1.045); }
  100% { transform: scale(1); }
}

/* 错误：沿用粉色主题，仅用红色 ✗ 标记突出对错 */
.quiz-opt.wrong {
  background: rgba(244,114,182,0.22);
  border-color: var(--pink);
  box-shadow: 0 0 0 2px rgba(244,114,182,0.25);
  color: var(--text);
  font-weight: 700;
  transform: none;
}
.quiz-opt.wrong::after {
  content: '✗';
  position: absolute; right: 18px; top: 50%;
  transform: translateY(-50%);
  font-weight: 900;
  color: #ef4444;
  font-size: 1.25rem;
  text-shadow: 0 0 12px rgba(239,68,68,0.5);
}
.quiz-opt.wrong .opt-key {
  background: rgba(244,114,182,0.25);
  border-color: var(--pink);
  color: var(--pink);
}
/* 选错时的水平抖动 */
.quiz-opt.shake-wrong { animation: shakeX 0.5s ease; }
@keyframes shakeX {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-8px); }
  40% { transform: translateX(8px); }
  60% { transform: translateX(-5px); }
  80% { transform: translateX(5px); }
}
/* 当用户选错时，自动标记为正确的高亮选项会带 ✓；其余未选且非正确的选项变暗，进一步突出反馈 */
.quiz-opt:disabled:not(.correct):not(.wrong) {
  opacity: 0.4;
}
.quiz-opt:disabled { cursor: not-allowed; }
/* 选答后的题目解析提示框：柔和紫色系，避免高亮刺眼。默认被 GSAP 滑入显现 */
.quiz-expl {
  margin-top: 18px;
  padding: 14px 16px;
  border-radius: 12px;
  background: rgba(167,139,250,0.06);
  border: 1px solid rgba(167,139,250,0.18);
  border-left: 3px solid var(--purple);
  color: var(--text);
  font-size: 0.95rem;
  line-height: 1.7;
  opacity: 0;
  transform: translateY(14px);
}
.quiz-expl.revealed { opacity: 1; transform: translateY(0); }
.quiz-expl .expl-label {
  display: block;
  font-weight: 700;
  color: var(--purple);
  letter-spacing: 1px;
  margin-bottom: 6px;
}
.quiz-foot {
  margin-top: 22px;
  display: flex; align-items: center; justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}
.quiz-foot-left {
  display: flex; align-items: center; gap: 14px;
  flex-wrap: wrap;
}
/* 「下载题目」按钮：青色细边 + 浮起，随时可用（不依赖答题进度），JS 触发下载 */
.quiz-dl {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 9px 18px; border-radius: 50px;
  background: rgba(45,212,191,0.1);
  border: 1px solid rgba(45,212,191,0.45);
  color: var(--teal);
  font-weight: 700; font-size: 0.9rem;
  cursor: pointer; font-family: inherit;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.25s ease;
}
.quiz-dl:hover {
  transform: translateY(-2px);
  background: rgba(45,212,191,0.18);
  box-shadow: 0 8px 20px rgba(45,212,191,0.28);
}
.quiz-score {
  font-weight: 800; color: var(--gold-1);
  transition: transform 0.3s ease;
  display: inline-block;
}
.quiz-score.bump { animation: scoreBump 0.4s ease; }
@keyframes scoreBump {
  0% { transform: scale(1); }
  50% { transform: scale(1.2); color: var(--gold-2); }
  100% { transform: scale(1); }
}
.quiz-next {
  padding: 10px 26px; border-radius: 50px;
  background: linear-gradient(135deg, var(--gold-1), var(--gold-2));
  color: #0f1524; font-weight: 700; border: none; cursor: pointer;
  box-shadow: 0 6px 18px rgba(251,191,36,0.3);
  transition: transform 0.2s ease, box-shadow 0.2s ease, opacity 0.3s ease;
}
.quiz-next:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 10px 24px rgba(251,191,36,0.4);
}
.quiz-next:disabled { opacity: 0.4; cursor: not-allowed; }

/* 测验完成庆祝 */
.quiz-done {
  text-align: center; padding: 26px 10px;
}
.quiz-done .done-emoji {
  font-size: 3.2rem; display: block; margin-bottom: 14px;
  animation: floaty 2.6s ease-in-out infinite;
}
@keyframes floaty {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}
.quiz-done .done-title {
  font-size: 1.4rem; font-weight: 800; margin-bottom: 8px;
  background: linear-gradient(90deg, var(--gold-1), var(--pink), var(--purple), var(--teal));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.quiz-done .done-stars { font-size: 1.4rem; letter-spacing: 6px; margin-top: 6px; }
.quiz-retry {
  margin-top: 20px;
  padding: 12px 34px; border-radius: 50px;
  background: linear-gradient(135deg, var(--teal), var(--purple));
  color: #0f1524; font-weight: 700; font-size: 1rem; border: none; cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.quiz-retry:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 24px rgba(45,212,191,0.35);
}

/* ---------- 下载题册说明弹窗（黑色底居中卡片） ---------- */
.ql-overlay {
  position: fixed; inset: 0; z-index: 260;
  display: grid; place-items: center;
  background: rgba(8, 11, 18, 0.78);
  backdrop-filter: blur(4px);
  opacity: 0; visibility: hidden; pointer-events: none;
  transition: opacity 0.35s ease, visibility 0.35s;
}
.ql-overlay.show { opacity: 1; visibility: visible; pointer-events: auto; }
.ql-content {
  position: relative;
  width: min(560px, 92%);
  max-height: 86vh; overflow-y: auto;
  background: linear-gradient(160deg, #151b2c 0%, #0f1524 100%);
  border: 1px solid rgba(45,212,191,0.35);
  border-radius: 20px;
  box-shadow: 0 30px 80px rgba(0,0,0,0.6), inset 0 1px 0 rgba(255,255,255,0.06);
  padding: 40px 38px 30px;
}
.ql-close {
  position: absolute; top: 16px; right: 18px;
  width: 36px; height: 36px;
  display: grid; place-items: center;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.14);
  color: var(--muted);
  border-radius: 50%;
  font-size: 1rem; line-height: 1;
  cursor: pointer; font-family: inherit;
  transition: background 0.25s, color 0.25s, transform 0.2s;
}
.ql-close:hover { background: rgba(244,114,182,0.18); color: var(--pink); transform: rotate(90deg); }
.ql-kicker {
  letter-spacing: 4px; font-size: 0.72rem; font-weight: 700;
  color: var(--teal); text-transform: uppercase; margin-bottom: 8px;
}
.ql-title {
  font-size: 1.6rem; font-weight: 800; line-height: 1.3; margin-bottom: 6px;
  background: linear-gradient(90deg, var(--teal), var(--purple));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.ql-sub { color: var(--muted); font-size: 0.95rem; margin-bottom: 22px; }
.ql-features { list-style: none; display: flex; flex-direction: column; gap: 10px; padding: 0; margin-bottom: 28px; }
.ql-features li {
  /* 图标与文字同行自然流动（行内排版），避免「图标列 + 文字列」的锯齿阅读顺序 */
  color: var(--text); font-size: 0.95rem; line-height: 1.7;
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.06);
  border-left: 3px solid var(--teal);
  border-radius: 10px;
  padding: 12px 16px;
  text-align: left;
}
.ql-features li span { font-size: 1.1rem; margin-right: 8px; }
.ql-features b { color: var(--teal); font-weight: 800; }
.ql-actions { display: flex; gap: 12px; justify-content: flex-end; }
.ql-cancel, .ql-go {
  padding: 11px 24px; border-radius: 50px;
  font-weight: 700; font-size: 0.95rem; cursor: pointer; font-family: inherit;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.25s, color 0.25s;
}
.ql-cancel {
  background: transparent;
  border: 1px solid rgba(255,255,255,0.22);
  color: var(--muted);
}
.ql-cancel:hover { color: var(--text); border-color: rgba(255,255,255,0.4); }
.ql-go {
  background: linear-gradient(135deg, var(--teal), var(--purple));
  border: none; color: #0f1524;
  box-shadow: 0 8px 22px rgba(45,212,191,0.3);
}
.ql-go:hover { transform: translateY(-2px); box-shadow: 0 12px 28px rgba(45,212,191,0.42); }
@media (max-width: 480px) {
  .ql-content { padding: 30px 18px 24px; }
  .ql-features li { padding: 11px 13px; }
  .ql-actions { justify-content: center; }
}