:root {
  --paper: #f7f2e7;
  --card: #fffdf8;
  --ink: #2f2a24;
  --muted: #6d6458;
  --line: #e4dccb;
  --leaf: #3f7a4a;
  --leaf-dark: #2f5e38;
  --leaf-soft: #e3efdf;
  --tomato: #b9442f;
  --tomato-soft: #f8e1da;
  --mark: #ffe27a;
  --radius: 18px;
  --read: "LXGW WenKai TC", "Kaiti TC", "DFKai-SB", "BiauKai", serif;
  --ui: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--ui);
  line-height: 1.6;
}
[hidden] { display: none !important; }
.wrap { max-width: 760px; margin: 0 auto; padding: 24px 18px 56px; }

.top { text-align: center; margin-bottom: 18px; }
.kicker { margin: 0; color: var(--muted); font-size: 16px; letter-spacing: .1em; }
h1 { font-family: var(--read); font-size: clamp(34px, 6vw, 46px); margin: 4px 0 14px; color: var(--leaf-dark); }

.progress { list-style: none; display: flex; justify-content: center; gap: 8px; padding: 0; margin: 0; flex-wrap: wrap; }
.progress li {
  width: 34px; height: 34px; border-radius: 50%;
  display: grid; place-items: center;
  font-size: 15px; font-weight: 700;
  background: var(--card); border: 2px solid var(--line); color: var(--muted);
}
.progress li.done { background: var(--leaf); border-color: var(--leaf); color: #fff; }
.progress li.now { border-color: var(--leaf); color: var(--leaf-dark); box-shadow: 0 0 0 4px var(--leaf-soft); }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: clamp(20px, 4vw, 36px);
  box-shadow: 0 6px 20px rgba(80, 60, 30, .07);
}
.start { text-align: center; }
.big { font-family: var(--read); font-size: 28px; margin: 0 0 12px; }
.rules { list-style: none; padding: 0; margin: 0 0 24px; font-size: 21px; color: var(--muted); }
.rules li { margin: 4px 0; }

.btn {
  font-family: var(--ui); font-size: 22px; font-weight: 700;
  border-radius: 999px; border: 0; cursor: pointer;
  padding: 14px 32px; min-height: 56px;
}
.btn.primary { background: var(--leaf); color: #fff; }
.btn.primary:hover { background: var(--leaf-dark); }
.btn.ghost { background: transparent; color: var(--leaf-dark); border: 2px solid var(--leaf); font-size: 18px; padding: 10px 22px; min-height: 48px; }
.btn:focus-visible, .opt:focus-visible { outline: 4px solid #1d5fa8; outline-offset: 3px; }

.earlier { margin-bottom: 14px; }
.earlier-text {
  margin-top: 12px; padding: 16px 20px; border-radius: 14px;
  background: #efe8d8; color: #4b4339;
  font-family: var(--read); font-size: 22px; line-height: 1.9;
}
.earlier-text p { margin: 0 0 8px; text-indent: 2em; }

.stage-label { margin: 0 0 12px; color: var(--muted); font-size: 17px; font-weight: 700; }
.passage {
  font-family: var(--read);
  font-size: clamp(28px, 4.6vw, 34px);
  line-height: 2;
  padding: 18px 22px;
  background: var(--leaf-soft);
  border-radius: 14px;
  margin-bottom: 24px;
}
.sent { display: block; }
.sent + .sent { margin-top: 10px; }
mark { background: var(--mark); color: inherit; padding: 0 3px; border-radius: 4px; }

.q { font-size: 24px; font-weight: 700; margin: 0 0 14px; }
.options { display: grid; gap: 12px; }
.opt {
  display: flex; align-items: center; gap: 14px;
  width: 100%; text-align: left;
  font-family: var(--ui); font-size: 23px; color: var(--ink);
  background: #fff; border: 2px solid var(--line); border-radius: 14px;
  padding: 14px 18px; min-height: 64px; cursor: pointer;
}
.opt:hover:not(:disabled) { border-color: var(--leaf); }
.opt .letter {
  flex: none; width: 38px; height: 38px; border-radius: 50%;
  display: grid; place-items: center; font-weight: 700; font-size: 19px;
  background: var(--paper); color: var(--muted);
}
.opt.right { border-color: var(--leaf); background: var(--leaf-soft); }
.opt.right .letter { background: var(--leaf); color: #fff; }
.opt.wrong { border-color: var(--tomato); background: var(--tomato-soft); }
.opt:disabled { cursor: default; }
.opt:disabled:not(.right) { opacity: .55; }
.shake { animation: shake .35s; }
@keyframes shake { 25% { transform: translateX(-6px); } 75% { transform: translateX(6px); } }
@media (prefers-reduced-motion: reduce) { .shake { animation: none; } }

.feedback { min-height: 32px; margin: 16px 0 0; font-size: 21px; font-weight: 700; }
.feedback.ok { color: var(--leaf-dark); }
.feedback.try { color: var(--tomato); }
.help {
  margin-top: 12px; padding: 12px 18px; border-radius: 12px;
  background: #fff4d6; border: 2px dashed #d9a521; font-size: 20px; font-weight: 700;
}
.help p { margin: 0; }
#nextBtn { margin-top: 20px; width: 100%; }

.finish h2 { font-family: var(--read); font-size: 32px; margin: 0 0 6px; color: var(--leaf-dark); }
.note { font-size: 21px; margin: 0 0 20px; }
.full {
  font-family: var(--read); font-size: clamp(24px, 4vw, 29px); line-height: 2;
  padding: 22px 24px; border: 2px solid var(--line); border-radius: 14px; background: #fff;
  margin-bottom: 22px;
}
.full h3 { text-align: center; margin: 0 0 8px; font-size: 1.15em; }
.full p { margin: 0 0 10px; text-indent: 2em; }

@media (max-width: 480px) {
  .wrap { padding: 16px 12px 40px; }
  .progress li { width: 30px; height: 30px; font-size: 14px; }
  .opt { font-size: 21px; }
}