/**
 * L05 讲义 · 专题内容组件（版式外壳见 ../shared/grammar-handout.css）
 */

body.grammar-handout-page.l05-handout {
  background:
    radial-gradient(circle at 12% 12%, rgba(204, 251, 241, 0.45) 0%, transparent 42%),
    radial-gradient(circle at 88% 88%, rgba(255, 237, 213, 0.35) 0%, transparent 40%),
    linear-gradient(168deg, #e0f2fe 0%, #f0fdfa 38%, #e2e8f0 100%);
}

body.grammar-handout-page main.sheet.l05-handout {
  max-width: var(--gh-sheet-max, 900px);
}

/* —— 封面（屏幕） —— */
body.grammar-handout-page.l05-handout .handout-cover {
  position: relative;
  margin: -0.25rem -0.5rem 1.25rem;
  padding: 2.5rem 1.5rem 2.75rem;
  border-radius: 10px 24px 12px 20px;
  overflow: hidden;
  text-align: center;
  color: #1a2a3a;
}

body.grammar-handout-page.l05-handout .handout-cover__bg {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(145deg, #ccfbf1 0%, #f0fdfa 42%, #fff 100%),
    radial-gradient(ellipse 80% 60% at 15% 10%, rgba(13, 148, 136, 0.2), transparent 55%),
    radial-gradient(ellipse 70% 50% at 90% 85%, rgba(14, 165, 233, 0.14), transparent 50%);
  border: 1px solid rgba(13, 148, 136, 0.22);
  border-radius: inherit;
  z-index: 0;
}

body.grammar-handout-page.l05-handout .handout-cover__bg::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 5px;
  background: linear-gradient(90deg, #0d9488, #14b8a6, #0d9488);
}

body.grammar-handout-page.l05-handout .handout-cover__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(
      circle at 20% 30%,
      rgba(13, 148, 136, 0.08) 0 1px,
      transparent 1px
    ),
    radial-gradient(circle at 80% 70%, rgba(14, 165, 233, 0.06) 0 1px, transparent 1px);
  background-size: 18px 18px, 22px 22px;
  opacity: 0.65;
  pointer-events: none;
}

body.grammar-handout-page.l05-handout .handout-cover__inner {
  position: relative;
  z-index: 1;
  max-width: 28rem;
  margin: 0 auto;
}

body.grammar-handout-page.l05-handout .handout-cover__brand {
  margin: 0 0 1rem;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: #0f766e;
}

body.grammar-handout-page.l05-handout .handout-cover__en {
  margin: 0 0 0.35rem;
  font-family: "Georgia", "Times New Roman", "Songti SC", serif;
  font-size: 1.05rem;
  font-style: italic;
  letter-spacing: 0.12em;
  color: #4a7c9b;
}

body.grammar-handout-page.l05-handout .handout-cover__title {
  margin: 0 0 0.5rem;
  font-size: clamp(1.85rem, 5vw, 2.55rem);
  font-weight: 800;
  letter-spacing: 0.12em;
  line-height: 1.22;
  color: #0d1b2a;
}

body.grammar-handout-page.l05-handout .handout-cover__rule {
  width: 3.5rem;
  height: 3px;
  margin: 0 auto 1rem;
  border-radius: 2px;
  background: linear-gradient(90deg, transparent, #0d9488, transparent);
}

body.grammar-handout-page.l05-handout .handout-cover__focus {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.65;
  font-weight: 500;
  color: #475569;
  letter-spacing: 0.04em;
}

body.grammar-handout-page.l05-handout .handout-section > h2.section-title:first-child {
  margin-top: 0;
}

/* 例句双栏（屏幕；打印见 shared/grammar-handout-print.css） */
body.grammar-handout-page.l05-handout .handout-ex-two-col {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.5rem;
  margin: 0.5rem 0 0;
}

@media screen and (min-width: 640px) {
  body.grammar-handout-page.l05-handout .handout-ex-two-col {
    grid-template-columns: 1fr 1fr;
    gap: 0.55rem 0.65rem;
  }
}

body.grammar-handout-page.l05-handout .handout-ex-two-col .ex-pair {
  margin: 0;
}

body.grammar-handout-page.l05-handout .handout-answers summary {
  cursor: pointer;
  font-weight: 800;
  color: var(--gh-accent-ink, #0f766e);
  margin: 0.5rem 0 0.35rem;
}

.print-pillars {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 0.65rem;
  margin: 0.65rem 0;
}

.print-pillar {
  text-align: center;
  padding: 0.75rem 0.55rem;
  border-radius: 12px;
  border: 2px dashed rgba(13, 148, 136, 0.35);
  background: rgba(204, 251, 241, 0.35);
  font-size: 0.88rem;
  line-height: 1.45;
}

.print-pillar strong {
  display: block;
  color: var(--gh-accent-ink, #0f766e);
  margin-bottom: 0.25rem;
}

.print-two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

.warn-strip {
  padding: 0.55rem 0.75rem;
  border-radius: 10px;
  background: rgba(211, 47, 47, 0.08);
  border-left: 4px solid #e53935;
  color: #b71c1c;
  margin: 0.5rem 0;
  font-weight: 700;
  font-size: 0.86rem;
  page-break-inside: avoid;
}

.practice-box {
  border: 2px dashed rgba(13, 148, 136, 0.4);
  border-radius: 10px;
  padding: 0.5rem 0.65rem;
  background: rgba(204, 251, 241, 0.18);
  margin: 0.4rem 0;
  font-size: 0.9rem;
  page-break-inside: avoid;
}

.answer-line {
  display: inline-block;
  min-width: 6em;
  border-bottom: 2px solid var(--gh-ink, #1e293b);
}

.print-list {
  margin: 0.35rem 0 0.5rem 1.1rem;
  padding-left: 1rem;
  font-size: 0.9rem;
}

.print-list li {
  margin-bottom: 0.28rem;
}

@media (max-width: 720px) {
  .print-two-col {
    grid-template-columns: 1fr;
  }

  body.grammar-handout-page.l05-handout .print-pillars {
    grid-template-columns: 1fr;
  }
}

/* 专题打印微调（页边距/分页主规则见 shared/grammar-handout-print.css） */
@media print {
  body.grammar-handout-page.l05-handout .practice-box,
  body.grammar-handout-page.l05-handout .warn-strip,
  body.grammar-handout-page.l05-handout .print-pillar,
  body.grammar-handout-page.l05-handout .print-pillars {
    break-inside: avoid;
    page-break-inside: avoid;
  }

  .print-pillars {
    grid-template-columns: repeat(2, 1fr);
    gap: 2mm;
  }

  .print-pillar {
    min-height: auto;
    padding: 2mm;
    font-size: 9pt;
    border: 0.45pt solid #333 !important;
    background: #f8fafc !important;
  }

  .warn-strip {
    border: 0.45pt solid #c62828 !important;
    background: #fff5f5 !important;
    color: #000 !important;
  }

  .practice-box {
    border: 0.45pt dashed #555 !important;
    background: #fff !important;
  }

  .answer-line {
    border-bottom: 0.5pt solid #000 !important;
  }
}