/* 八字入门 · 课后作业 —— 宣纸墨字风格 */
* { box-sizing: border-box; margin: 0; padding: 0; -webkit-tap-highlight-color: transparent; }
html { font-size: 16px; }
body {
  font-family: "Songti SC", "STSong", "Noto Serif SC", "SimSun", serif;
  background: #f6f1e5;
  background-image:
    radial-gradient(ellipse at 20% 10%, rgba(158, 43, 37, 0.03), transparent 50%),
    radial-gradient(ellipse at 80% 90%, rgba(43, 43, 38, 0.04), transparent 50%);
  color: #2b2b26; min-height: 100vh; line-height: 1.75;
}
.app { max-width: 720px; margin: 0 auto; padding: 20px 18px 60px; }

/* ── 首页 ── */
.seal-img {
  display: block; width: 118px; height: auto; margin: 22px auto 10px;
  mix-blend-mode: multiply;          /* 白底化进宣纸底色 */
  transform: rotate(-2deg);
  filter: contrast(1.05);
}
.home-title { text-align: center; font-size: 26px; letter-spacing: 6px; margin-bottom: 4px; }
.home-sub { text-align: center; color: #6b6455; font-size: 14px; letter-spacing: 2px; margin-bottom: 26px; }
.card {
  background: #fffdf7; border: 1px solid #ddd3ba; border-radius: 10px;
  padding: 20px 18px; margin-bottom: 16px;
  box-shadow: 0 1px 0 rgba(43,43,38,.06);
}
.quiz-card h2 { font-size: 19px; margin-bottom: 4px; }
.quiz-card .sub { color: #6b6455; font-size: 13.5px; margin-bottom: 8px; }
.quiz-card .intro { font-size: 14px; color: #4a463c; margin-bottom: 10px; }
.meta-row { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 12px; }
.chip {
  display: inline-block; padding: 2px 10px; border: 1px solid #c9bd9e; border-radius: 999px;
  font-size: 12.5px; color: #6b6455; background: #faf6ea;
}
.chip.lesson { color: #9e2b25; border-color: #d9a29c; background: #faf0ec; }

.nick-row { display: flex; gap: 10px; margin: 18px 0 8px; }
.nick-row input {
  flex: 1; padding: 12px 14px; font-size: 16px; font-family: inherit;
  border: 1px solid #c9bd9e; border-radius: 8px; background: #fffdf7; color: #2b2b26;
}
.nick-row input:focus { outline: 2px solid #9e2b25; outline-offset: -1px; }

.btn {
  display: inline-block; border: none; cursor: pointer; font-family: inherit;
  background: #9e2b25; color: #fdf9ef; font-size: 16px; letter-spacing: 3px;
  padding: 13px 26px; border-radius: 8px; box-shadow: 0 2px 0 rgba(43,43,38,.2);
}
.btn:active { transform: translateY(1px); box-shadow: none; }
.btn.ghost { background: transparent; color: #6b6455; border: 1px solid #c9bd9e; box-shadow: none; letter-spacing: 1px; }
.btn.block { display: block; width: 100%; }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn-row { display: flex; gap: 10px; margin-top: 14px; }
.btn-row .btn { flex: 1; }

.resume-card { border-left: 5px solid #9e2b25; }
.resume-card .sub { color: #6b6455; font-size: 13.5px; margin: 4px 0 12px; }

.footnote { text-align: center; color: #8a8271; font-size: 12.5px; margin-top: 26px; line-height: 2; }

/* ── 答题页 ── */
.quiz-head { display: flex; align-items: center; gap: 12px; margin-bottom: 6px; }
.quiz-head .back { color: #8a8271; text-decoration: none; font-size: 14px; white-space: nowrap; }
.quiz-head h1 { font-size: 16px; flex: 1; letter-spacing: 1px; }
.quiz-head .score-now { font-size: 13px; color: #9e2b25; white-space: nowrap; }
.progress-wrap { height: 6px; background: #e6dcc4; border-radius: 3px; margin: 6px 0 4px; overflow: hidden; }
.progress-bar { height: 100%; background: #9e2b25; border-radius: 3px; transition: width .3s; }
.progress-text { font-size: 12.5px; color: #8a8271; margin-bottom: 14px; display: flex; justify-content: space-between; }

.qcard { background: #fffdf7; border: 1px solid #ddd3ba; border-radius: 10px; padding: 22px 18px; }
.qtag-row { display: flex; align-items: center; gap: 8px; margin-bottom: 12px; }
.qtag {
  font-size: 12.5px; padding: 2px 10px; border-radius: 4px; letter-spacing: 1px;
  background: #efe7d2; color: #6b6455; border: 1px solid #ddd3ba;
}
.qtag.t-single { background: #eef0e6; border-color: #cfd6bd; color: #4f5c3a; }
.qtag.t-multi  { background: #e8eef0; border-color: #c3d2d6; color: #39565c; }
.qtag.t-judge  { background: #f2e9df; border-color: #e0cdb8; color: #7a5230; }
.qtag.t-blank  { background: #efe6ee; border-color: #d9c3d4; color: #65405c; }
.qtag.t-essay  { background: #faf0ec; border-color: #d9a29c; color: #9e2b25; }
.qscore { font-size: 12.5px; color: #8a8271; }
.qno { font-size: 12.5px; color: #8a8271; margin-left: auto; }

.stem { font-size: 17.5px; line-height: 1.9; margin-bottom: 18px; }

.opt {
  display: flex; gap: 12px; align-items: flex-start;
  border: 1px solid #ddd3ba; border-radius: 8px; background: #fffef9;
  padding: 13px 14px; margin-bottom: 10px; cursor: pointer; font-size: 15.5px;
  transition: border-color .15s, background .15s;
}
.opt .letter {
  flex: none; width: 26px; height: 26px; border: 1px solid #c9bd9e; border-radius: 50%;
  display: flex; align-items: center; justify-content: center; font-size: 14px; color: #6b6455;
  background: #faf6ea;
}
.opt.sel { border-color: #9e2b25; background: #faf0ec; }
.opt.sel .letter { background: #9e2b25; color: #fdf9ef; border-color: #9e2b25; }
.opt.right { border-color: #3d6b57; background: #eef3ec; }
.opt.right .letter { background: #3d6b57; color: #fff; border-color: #3d6b57; }
.opt.miss { border-color: #9e2b25; background: #faf0ec; }
.opt.miss .letter { background: #9e2b25; color: #fff; border-color: #9e2b25; }
.opt.disabled { cursor: default; }

.judge-row { display: flex; gap: 12px; }
.judge-btn {
  flex: 1; padding: 18px 0; text-align: center; font-size: 19px; cursor: pointer;
  border: 1px solid #ddd3ba; border-radius: 8px; background: #fffef9; font-family: inherit; color: #2b2b26;
}
.judge-btn.sel { border-color: #9e2b25; background: #faf0ec; color: #9e2b25; font-weight: bold; }

.blank-item { display: flex; align-items: center; gap: 10px; margin-bottom: 10px; }
.blank-item label { flex: none; font-size: 14px; color: #6b6455; }
.blank-item input {
  flex: 1; padding: 11px 12px; font-size: 16px; font-family: inherit;
  border: 1px solid #c9bd9e; border-radius: 8px; background: #fffdf7; color: #2b2b26;
}
.blank-item input:focus { outline: 2px solid #9e2b25; outline-offset: -1px; }
.blank-item input.b-right { border-color: #3d6b57; background: #eef3ec; }
.blank-item input.b-wrong { border-color: #9e2b25; background: #faf0ec; }

textarea.essay-input {
  width: 100%; min-height: 160px; padding: 12px; font-size: 15.5px; font-family: inherit;
  border: 1px solid #c9bd9e; border-radius: 8px; background: #fffdf7; color: #2b2b26;
  line-height: 1.8; resize: vertical;
}
textarea.essay-input:focus { outline: 2px solid #9e2b25; outline-offset: -1px; }

.submit-row { margin-top: 18px; }

/* ── 反馈面板 ── */
.feedback { margin-top: 16px; border-radius: 10px; padding: 18px; border: 1px solid; }
.feedback.ok { background: #eef3ec; border-color: #b9cbb4; }
.feedback.no { background: #faf0ec; border-color: #d9a29c; }
.feedback.partial { background: #f7f2e2; border-color: #dccb9a; }
.fb-title { font-size: 17px; font-weight: bold; margin-bottom: 10px; letter-spacing: 2px; }
.feedback.ok .fb-title { color: #3d6b57; }
.feedback.no .fb-title { color: #9e2b25; }
.feedback.partial .fb-title { color: #8a6d1f; }
.fb-line { font-size: 14.5px; margin-bottom: 8px; }
.fb-line .k { color: #6b6455; }
.fb-ans { color: #3d6b57; font-weight: bold; }
.fb-your-wrong { color: #9e2b25; text-decoration: line-through; }
.fb-analysis { font-size: 14.5px; background: rgba(255,255,255,.55); border-radius: 8px; padding: 12px 14px; margin: 10px 0; line-height: 1.9; }
.fb-analysis .k { display: block; color: #6b6455; font-size: 13px; margin-bottom: 2px; letter-spacing: 2px; }
.fb-ref { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; margin-top: 10px; }
.self-assess { margin-top: 14px; }
.self-assess p { font-size: 14px; color: #6b6455; margin-bottom: 8px; }
.self-assess .btn-row { margin-top: 0; }
.self-assess .btn { letter-spacing: 0; font-size: 14.5px; padding: 11px 8px; }

/* ── 结果页 ── */
.result-card { text-align: center; padding: 34px 18px; }
.score-big { font-size: 64px; font-weight: bold; color: #2b2b26; line-height: 1.1; }
.score-big small { font-size: 20px; color: #8a8271; }
.stamp {
  display: inline-block; margin: 14px auto 6px; padding: 6px 18px;
  border: 3px solid #9e2b25; color: #9e2b25; border-radius: 6px;
  font-size: 22px; letter-spacing: 6px; transform: rotate(-3deg); font-weight: bold;
}
.stamp.green { border-color: #3d6b57; color: #3d6b57; }
.stamp.gray { border-color: #8a8271; color: #8a8271; }
.result-sub { color: #6b6455; font-size: 14px; margin-bottom: 6px; }
.breakdown { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; margin-top: 16px; }
.bd-item { border: 1px solid #ddd3ba; background: #faf6ea; border-radius: 8px; padding: 8px 14px; font-size: 13.5px; color: #4a463c; }
.bd-item b { color: #2b2b26; }

.wrong-list { text-align: left; margin-top: 20px; }
.wrong-list h3 { font-size: 16px; margin-bottom: 10px; letter-spacing: 2px; }
.wrong-item {
  background: #fffdf7; border: 1px solid #ddd3ba; border-radius: 8px;
  padding: 12px 14px; margin-bottom: 8px; font-size: 14px;
}
.wrong-item .top { display: flex; gap: 8px; align-items: center; margin-bottom: 4px; }
.wrong-item .stem-s { color: #4a463c; line-height: 1.7; }
.all-right { text-align: center; color: #3d6b57; font-size: 15px; padding: 16px 0 4px; }

@media (min-width: 640px) {
  .home-title { font-size: 30px; }
  .stem { font-size: 18.5px; }
}