:root {
  --starter: #2f7d69;
  --starter-dark: #20594b;
  --starter-soft: #e9f6f1;
  --starter-warm: #fff8e8;
  --starter-orange: #e98b3a;
}

.starter-site { background: #f5f8f7; }
.starter-site .navbar-nav .active { background: var(--starter-soft); color: var(--starter-dark); }

.starter-hero {
  color: #fff;
  background:
    radial-gradient(circle at 85% 10%, rgba(255,255,255,.17), transparent 28%),
    linear-gradient(135deg, #215d50, #3e947d);
  padding: 64px 24px 58px;
}
.starter-hero-inner { max-width: 960px; margin: 0 auto; text-align: center; }
.starter-eyebrow { color: #c9f2e5; font-size: .85rem; font-weight: 700; letter-spacing: .12em; margin-bottom: 10px; }
.starter-hero h1 { font-size: clamp(2rem, 5vw, 3.2rem); line-height: 1.2; letter-spacing: .02em; }
.starter-hero > .starter-hero-inner > p { max-width: 720px; margin: 18px auto 0; color: rgba(255,255,255,.86); font-size: 1.05rem; }
.starter-main { max-width: 1080px; margin: 0 auto; padding: 42px 24px 72px; }

.starter-level-section { margin-top: 48px; }
.starter-level-section:first-child { margin-top: 0; }
.starter-level-heading { display: flex; align-items: end; justify-content: space-between; gap: 20px; border-bottom: 2px solid #dce9e5; padding-bottom: 12px; margin-bottom: 18px; }
.starter-level-heading span { color: var(--starter); font-size: .76rem; font-weight: 700; letter-spacing: .1em; }
.starter-level-heading h2 { font-size: 1.35rem; }
.starter-level-heading > p { color: #7c8f88; font-size: .82rem; }
.starter-lesson-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.starter-lesson-card { min-height: 160px; display: flex; flex-direction: column; position: relative; padding: 20px; background: #fff; border: 1px solid #dbe7e3; border-radius: 14px; transition: transform .18s, box-shadow .18s, border-color .18s; }
a.starter-lesson-card:hover { transform: translateY(-3px); border-color: #9fc9bb; box-shadow: 0 8px 22px rgba(34,93,80,.1); }
.starter-card-num { color: var(--starter); font-size: .78rem; font-weight: 800; }
.starter-card-domain { position: absolute; top: 16px; right: 16px; border-radius: 12px; background: var(--starter-soft); color: var(--starter-dark); padding: 2px 9px; font-size: .68rem; }
.starter-lesson-card strong { margin-top: 12px; font-size: 1.02rem; line-height: 1.4; }
.starter-card-zh { color: #75867f; font-size: .84rem; }
.starter-card-status { margin-top: auto; color: var(--starter); font-size: .76rem; font-weight: 700; }
.starter-lesson-card.is-planned { background: #f1f4f3; color: #82908b; border-style: dashed; }
.starter-lesson-card.is-planned .starter-card-status { color: #9ba8a4; }
.starter-lesson-card.is-complete { border-color: #73b6a1; box-shadow: inset 0 0 0 1px #73b6a1; }

.starter-lesson { max-width: 900px; margin: 0 auto; padding: 30px 24px 72px; }
.starter-loading, .starter-error { margin: 70px auto; padding: 40px; text-align: center; background: #fff; border-radius: 14px; }
.starter-error a { display: inline-block; margin-top: 18px; color: var(--starter); font-weight: 700; }
.starter-breadcrumb { display: flex; gap: 9px; color: #7a8c86; font-size: .82rem; margin-bottom: 18px; }
.starter-breadcrumb a { color: var(--starter); }
.starter-lesson-header { background: linear-gradient(135deg, #225f51, #3e947d); color: #fff; border-radius: 20px; padding: 38px 42px; box-shadow: 0 8px 26px rgba(34,93,80,.16); }
.starter-lesson-kicker { color: #c9f2e5; font-size: .78rem; font-weight: 700; letter-spacing: .08em; }
.starter-lesson-header h1 { margin-top: 7px; font-size: clamp(1.8rem, 5vw, 2.7rem); line-height: 1.25; }
.starter-lesson-header h1 span { opacity: .68; font-size: .55em; vertical-align: middle; margin-right: 8px; }
.starter-lesson-title-zh { font-size: 1.1rem; color: #e4f6f0; }
.starter-lesson-intro { margin-top: 20px; padding-top: 18px; border-top: 1px solid rgba(255,255,255,.22); color: rgba(255,255,255,.83); }
.starter-lesson-meta { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; }
.starter-lesson-meta span { padding: 4px 10px; border-radius: 14px; background: rgba(255,255,255,.12); font-size: .72rem; }

.starter-section { margin-top: 24px; padding: 28px 30px; background: #fff; border: 1px solid #dce8e4; border-radius: 16px; box-shadow: 0 3px 14px rgba(34,93,80,.05); }
.starter-section-heading { display: flex; justify-content: space-between; align-items: end; gap: 20px; border-bottom: 1px solid #e5ece9; padding-bottom: 13px; margin-bottom: 20px; }
.starter-section-heading span { color: var(--starter); font-size: .7rem; font-weight: 800; letter-spacing: .1em; }
.starter-section-heading h2 { font-size: 1.18rem; line-height: 1.4; }
.starter-pattern-preview { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; }
.starter-pattern-preview div { padding: 12px 14px; border-radius: 9px; background: var(--starter-soft); }
.starter-pattern-preview strong, .starter-pattern-preview span { display: block; }
.starter-pattern-preview strong { color: var(--starter-dark); }
.starter-pattern-preview span { color: #687a74; font-size: .78rem; }

.starter-submit, .starter-retry { border: 0; border-radius: 20px; padding: 9px 17px; color: #fff; background: var(--starter); cursor: pointer; font: inherit; font-size: .82rem; font-weight: 700; }
.starter-submit:hover { background: var(--starter-dark); }
.starter-dialogue { border-top: 1px solid #e4ebe8; }
.starter-line {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  gap: 14px;
  padding: 9px 0;
  border-bottom: 1px solid #e7eeeb;
}
.starter-speaker {
  color: var(--starter);
  font-size: .72rem;
  font-weight: 800;
  padding-top: 2px;
  text-align: right;
}
.starter-bubble { min-width: 0; }
.starter-bubble [lang="en"] { color: #233c35; font-size: .98rem; line-height: 1.45; font-weight: 600; }
.starter-line-zh { color: #7a8984; font-size: .74rem; line-height: 1.4; margin-top: 1px; }
.starter-term {
  display: inline;
  margin: 0 .08em;
  padding: 2px 4px;
  border-radius: 4px;
  box-decoration-break: clone;
  -webkit-box-decoration-break: clone;
  line-height: 1.8;
}
.starter-term-word {
  color: #203a32;
}
.starter-term-note {
  color: #50645d;
  font-size: .76em;
  font-weight: 500;
  white-space: nowrap;
}
/* 沿用上册的黄、绿、蓝、紫、红色系；加深一级以适应较宽的行内注释色块。 */
.starter-term-color-0 { background: #FFD84D !important; }
.starter-term-color-1 { background: #96E57D !important; }
.starter-term-color-2 { background: #8DD5F2 !important; }
.starter-term-color-3 { background: #D39BE3 !important; }
.starter-term-color-4 { background: #FFA9B4 !important; }

#starterReadButton[hidden] { display: none; }

@media (max-width: 600px) {
  .starter-site .ap-speed-wrap { display: flex; }
  .starter-site .ap-speed { padding: 3px 5px; }
}

.starter-quiz-list { display: flex; flex-direction: column; gap: 16px; }
.starter-question { border: 1px solid #dce8e4; border-radius: 12px; padding: 18px; }
.starter-question fieldset { border: 0; }
.starter-question legend { font-weight: 700; color: #2f443e; padding: 0 0 12px; }
.starter-options { display: grid; grid-template-columns: 1fr 1fr; gap: 9px; }
.starter-options label { display: flex; align-items: center; gap: 9px; padding: 10px 12px; border: 1px solid #e0e8e5; border-radius: 9px; cursor: pointer; color: #52645e; font-size: .84rem; }
.starter-options label:hover { background: #f5faf8; border-color: #a9cbbf; }
.starter-options input { accent-color: var(--starter); }
.starter-option-letter { flex: 0 0 23px; height: 23px; display: grid; place-items: center; border-radius: 50%; background: #edf3f1; color: var(--starter-dark); font-weight: 800; font-size: .72rem; }
.starter-question.is-correct { border-color: #73b69f; background: #f1fbf7; }
.starter-question.is-wrong { border-color: #e2a57b; background: #fff8f2; }
.starter-answer-note { margin-top: 12px; padding-top: 10px; border-top: 1px dashed #d8e2df; color: #60726c; font-size: .78rem; }
.starter-quiz-actions { display: flex; gap: 10px; margin-top: 20px; }
.starter-submit, .starter-retry { padding: 11px 24px; }
.starter-retry { background: #fff; color: var(--starter); border: 1px solid var(--starter); }
.starter-quiz-result { margin-top: 15px; border-radius: 11px; padding: 16px 18px; display: flex; justify-content: space-between; gap: 12px; }
.starter-quiz-result.good { background: #e8f7f1; color: #23614f; }
.starter-quiz-result.review, .starter-quiz-result.needs-answer { background: #fff4e7; color: #8b5627; }
.starter-quiz-result strong, .starter-quiz-result span { display: block; }

.starter-lesson-nav { display: grid; grid-template-columns: 1fr 1fr; gap: 15px; margin-top: 26px; }
.starter-lesson-nav a { display: flex; flex-direction: column; padding: 17px 19px; border: 1px solid #dce8e4; border-radius: 12px; background: #fff; }
.starter-lesson-nav a.next { text-align: right; }
.starter-lesson-nav span { color: #789088; font-size: .72rem; }
.starter-lesson-nav strong { color: var(--starter-dark); font-size: .88rem; }

@media (max-width: 760px) {
  .starter-lesson-grid { grid-template-columns: 1fr 1fr; }
  .starter-pattern-preview { grid-template-columns: 1fr; }
}

@media (max-width: 520px) {
  .starter-hero { padding: 44px 18px; }
  .starter-main, .starter-lesson { padding-left: 14px; padding-right: 14px; }
  .starter-lesson-grid { grid-template-columns: 1fr; }
  .starter-level-heading { align-items: flex-start; flex-direction: column; gap: 4px; }
  .starter-lesson-header { padding: 28px 22px; }
  .starter-section { padding: 22px 17px; }
  .starter-options { grid-template-columns: 1fr; }
  .starter-line { grid-template-columns: 54px minmax(0, 1fr); gap: 10px; padding: 8px 0; }
  .starter-quiz-result { flex-direction: column; }
  .starter-lesson-nav { grid-template-columns: 1fr; }
}