:root {
  --ink: #14262e;
  --ink-soft: #5b6b74;
  --line: #dfe7ea;
  --bg: #f3f7f8;
  --card: #ffffff;
  --brand: #0f766e;
  --brand-2: #0e7490;
  --brand-soft: #e6f4f2;
  --accent: #b45309;
  --accent-soft: #fdf3e3;
  --danger: #b91c1c;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(16, 38, 45, 0.05), 0 8px 24px -12px rgba(16, 38, 45, 0.12);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
}

.wrap { max-width: 1080px; margin: 0 auto; padding: 0 20px; }

/* —— 头部 —— */
.hero {
  background: linear-gradient(135deg, #134e4a 0%, #0f766e 55%, #0e7490 100%);
  color: #fff;
  padding: 44px 0 40px;
}
.hero h1 { margin: 0; font-size: 32px; letter-spacing: 0.5px; }
.hero .logo { font-size: 28px; }
.tagline { margin: 10px 0 6px; font-size: 17px; font-weight: 600; opacity: 0.95; }
.sub { margin: 0; max-width: 780px; font-size: 14px; opacity: 0.85; }

/* —— 卡片 —— */
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 22px 24px;
  margin: 22px 0;
}
.card h2 { margin: 0 0 14px; font-size: 18px; }
.hidden { display: none !important; }
.sec-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-bottom: 14px; }
.sec-head h2 { margin: 0; }
.actions { display: flex; gap: 8px; flex-wrap: wrap; }

/* —— 输入区 —— */
.sample-row { display: flex; align-items: center; flex-wrap: wrap; gap: 8px; margin-bottom: 10px; }
.sample-label { font-size: 13px; color: var(--ink-soft); }
.sample-btns { display: flex; gap: 8px; flex-wrap: wrap; }
.sample-btn {
  border: 1px solid var(--line); background: var(--brand-soft); color: var(--brand);
  border-radius: 999px; padding: 5px 14px; font-size: 13px; cursor: pointer; font-weight: 600;
}
.sample-btn:hover { background: #d7ece9; }
.sample-btn.active { background: var(--brand); color: #fff; }
.upload-btn { font-size: 13px; color: var(--ink-soft); cursor: pointer; text-decoration: underline dotted; margin-left: auto; }

textarea {
  width: 100%; min-height: 170px; resize: vertical;
  border: 1px solid var(--line); border-radius: 10px; padding: 12px 14px;
  font: 13px/1.6 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  color: var(--ink); background: #fbfdfd;
}
textarea:focus { outline: 2px solid var(--brand-soft); border-color: var(--brand); }

.opts { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; margin-top: 12px; font-size: 14px; }
.hint-inline { font-size: 13px; color: var(--ink-soft); }

/* —— 按钮 —— */
.btn {
  border: 1px solid var(--line); background: #fff; color: var(--ink);
  border-radius: 10px; padding: 9px 18px; font-size: 14px; font-weight: 600;
  cursor: pointer; transition: 0.15s;
}
.btn:hover { border-color: var(--brand); color: var(--brand); }
.btn.primary { background: var(--brand); border-color: var(--brand); color: #fff; }
.btn.primary:hover { background: #0c5d56; }
.btn.small { padding: 5px 12px; font-size: 13px; border-radius: 8px; }

/* —— 章节卡片 —— */
.stats { font-size: 13px; font-weight: 500; color: var(--ink-soft); margin-left: 8px; }
.chapter-list { display: grid; gap: 12px; }
.chapter-card { border: 1px solid var(--line); border-radius: 12px; padding: 14px 16px; background: #fbfdfd; }
.chapter-head { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.chap-idx {
  display: inline-flex; align-items: center; justify-content: center;
  min-width: 30px; height: 30px; border-radius: 8px;
  background: var(--brand); color: #fff; font-weight: 700; font-size: 14px;
}
.chap-title { font-weight: 700; font-size: 15.5px; }
.chap-time {
  font-family: ui-monospace, Menlo, monospace; font-size: 12.5px; font-weight: 700;
  background: var(--brand-soft); color: var(--brand); border-radius: 6px; padding: 2px 8px;
}
.chap-meta { font-size: 12.5px; color: var(--ink-soft); margin-left: auto; }
.kw-chips { display: flex; gap: 6px; flex-wrap: wrap; margin: 8px 0 4px; }
.kw-chip {
  background: #fff; border: 1px solid var(--line); border-radius: 999px;
  padding: 2px 11px; font-size: 12.5px; color: var(--ink-soft);
}
.chapter-card details { margin-top: 6px; }
.chapter-card summary { cursor: pointer; font-size: 12.5px; color: var(--brand); }
.chapter-text { font-size: 13px; color: var(--ink-soft); margin: 8px 0 0; max-height: 180px; overflow-y: auto; }

/* —— 作业包 —— */
.packet-ch { margin: 18px 0; padding-top: 14px; border-top: 1px dashed var(--line); }
.packet-ch:first-child { border-top: none; padding-top: 0; }
.q-item { display: flex; gap: 10px; margin: 10px 0; align-items: flex-start; }
.q-no {
  flex: none; width: 24px; height: 24px; border-radius: 6px; margin-top: 1px;
  background: var(--accent-soft); color: var(--accent);
  display: inline-flex; align-items: center; justify-content: center; font-size: 12.5px; font-weight: 700;
}
.q-text { font-size: 14.5px; }
.q-text .en { color: var(--ink-soft); font-style: italic; }
.q-label {
  display: inline-block; margin-right: 6px; font-size: 11.5px; font-weight: 700;
  color: var(--brand); background: var(--brand-soft); border-radius: 5px; padding: 1px 7px; vertical-align: 1px;
}
.write-line { border-bottom: 1px solid var(--line); height: 26px; margin: 6px 0 2px 34px; }
.answers { margin-top: 18px; border: 1px solid var(--line); border-radius: 10px; padding: 10px 16px; background: #fbfdfd; }
.answers summary { cursor: pointer; font-weight: 600; font-size: 14px; color: var(--brand); }
.answer-item { font-size: 13.5px; margin: 8px 0; }

/* —— 家长摘要 —— */
.sum-stats { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 16px; }
.stat-pill {
  border: 1px solid var(--line); border-radius: 10px; padding: 8px 16px; background: #fbfdfd;
  display: flex; flex-direction: column; min-width: 90px;
}
.stat-pill b { font-size: 20px; color: var(--brand); }
.stat-pill span { font-size: 12px; color: var(--ink-soft); }
.sum-ch { border-left: 3px solid var(--brand); padding: 2px 0 2px 14px; margin: 14px 0; }
.sum-ch-title { font-weight: 700; font-size: 14.5px; }
.sum-ch-title .time { font-family: ui-monospace, Menlo, monospace; font-size: 12px; color: var(--brand); font-weight: 700; }
.sum-line { font-size: 13.5px; color: var(--ink-soft); margin: 3px 0 0; }
.sum-suggest { font-size: 13.5px; margin: 5px 0 0; background: var(--accent-soft); border-radius: 8px; padding: 6px 12px; }
.sum-overview {
  margin-top: 18px; font-size: 14px; line-height: 1.8;
  background: var(--brand-soft); border-radius: 10px; padding: 14px 18px;
}

.hint { font-size: 12.5px; color: var(--ink-soft); margin: 12px 0 0; }

/* —— 页脚 —— */
.footer { padding: 26px 0 40px; color: var(--ink-soft); font-size: 13px; border-top: 1px solid var(--line); margin-top: 30px; background: #fff; }

/* —— 打印 —— */
@media print {
  body { background: #fff; }
  body.print-packet .not-packet { display: none !important; }
  body.print-summary .not-summary { display: none !important; }
  .card { box-shadow: none; border: none; padding: 0; margin: 0 0 18px; }
  .write-line { border-bottom: 1px solid #999; }
  .answers { display: none; }
  .chapter-text { max-height: none; overflow: visible; }
}

@media (max-width: 640px) {
  .hero h1 { font-size: 26px; }
  .card { padding: 16px; }
  .chap-meta { margin-left: 0; }
}