/* ============================================================
   偷分课详情页 · 克制设计系统
   - 字体：Arial + 微软雅黑（与站内一致）
   - 宽度：580（窄） / 760（宽）两档
   - 颜色：黑字 + 主蓝（CTA）+ 高亮黄；不靠彩色卡片
   - 圆角：8px 卡片 / 12px 大区块
   - 分区：靠分隔线和留白，不靠色块
   ============================================================ */

:root {
  --bg: #f6f8fc;
  --surface: #ffffff;
  --ink: #161816;
  --ink-2: #475569;
  --ink-3: #94a3b8;
  --line: #dbe2e9;
  --line-2: #e5e7eb;
  --brand: #dc2626;
  --brand-soft: #fee2e2;
  --highlight: #fff3b0;
  --highlight-warm: #fff7e8;
}

/* ----- 容器宽度档 ----- */
.sc-narrow { width: min(580px, calc(100% - 32px)); margin: 0 auto; }
.sc-wide   { width: min(760px, calc(100% - 32px)); margin: 0 auto; }

/* ----- Hero ----- */
.sc-hero { padding: 64px 0 12px; text-align: center; }
.sc-hero .section-tag {
  font-family: Arial, "Microsoft YaHei", "微软雅黑", sans-serif;
  color: var(--brand);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  margin-bottom: 14px;
}
.sc-hero h1 {
  margin: 0 auto 16px;
  max-width: 760px;
  font-size: 2rem;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: 0;
  line-height: 1.3;
}
.sc-hero > p {
  margin: 0 auto 18px;
  max-width: 580px;
  color: var(--ink-2);
  font-size: 0.95rem;
  line-height: 1.85;
}
.sc-hero .hero-actions { margin-top: 18px; }
.sc-hero .hero-actions span { color: var(--ink-2); font-size: 0.9rem; }

/* Hero bullets · Hero 区3个价值点（一行一个，窄栏居中） */
.sc-hero-bullets {
  list-style: none;
  margin: 18px auto 0;
  padding: 0;
  width: min(580px, calc(100% - 32px));
  text-align: left;
}
.sc-hero-bullets li {
  padding: 8px 0 8px 22px;
  position: relative;
  font-size: 0.95rem;
  color: var(--ink-2);
  line-height: 1.7;
  border-bottom: 1px dashed var(--line-2);
}
.sc-hero-bullets li:last-child { border-bottom: none; }
.sc-hero-bullets li::before {
  content: "·";
  position: absolute;
  left: 8px;
  top: 8px;
  color: var(--brand);
  font-weight: 700;
  font-size: 1.2rem;
  line-height: 1;
}
.sc-hero-bullets li b {
  color: var(--ink);
  font-weight: 700;
  margin-right: 8px;
}

/* ----- 段落标题（统一节奏） ----- */
.sc-h {
  font-family: Arial, "Microsoft YaHei", "微软雅黑", sans-serif;
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--ink);
  margin: 60px auto 16px;
  width: min(760px, calc(100% - 32px));
  text-align: center;
}

/* ----- 三门课程概览（窄栏，靠分隔线） ----- */
.sc-overview {
  width: min(760px, calc(100% - 32px));
  margin: 0 auto 44px;
  display: grid;
  gap: 12px;
}
.sc-course {
  padding: 20px 24px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 18px;
  align-items: center;
}
.sc-course .num {
  font-family: Arial, "Microsoft YaHei", "微软雅黑", sans-serif;
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--brand);
}
.sc-course .info b {
  display: block;
  font-size: 1rem;
  color: var(--ink);
  font-weight: 700;
  margin-bottom: 4px;
}
.sc-course .info span {
  display: block;
  font-size: 0.85rem;
  color: var(--ink-3);
  line-height: 1.55;
}
.sc-course .price { color: var(--ink-2); font-size: 0.95rem; }
.sc-course .price b { color: var(--ink); font-size: 1.15rem; }

/* ----- 一句话点睛（高亮黄底） ----- */
.sc-quote {
  width: min(760px, calc(100% - 32px));
  margin: 0 auto 44px;
  padding: 26px 30px;
  background: var(--highlight);
  border-radius: 8px;
  color: var(--ink);
  font-size: 1rem;
  line-height: 1.85;
  text-align: center;
}

/* ----- 通用段落 ----- */
.sc-prose { width: min(580px, calc(100% - 32px)); margin: 0 auto 24px; color: var(--ink-2); font-size: 0.95rem; line-height: 1.95; }
.sc-prose b { color: var(--ink); font-weight: 700; }

/* ----- Tab 切换 ----- */
.sc-tabs {
  width: min(760px, calc(100% - 32px));
  margin: 60px auto 0;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 0;
  border-bottom: 1px solid var(--line);
}
.sc-tab {
  appearance: none;
  background: transparent;
  border: none;
  border-bottom: 3px solid transparent;
  font: inherit;
  padding: 14px 12px 16px;
  cursor: pointer;
  text-align: center;
  color: var(--ink-2);
  transition: color .15s, border-color .15s;
  margin-bottom: -1px;
}
.sc-tab:hover { color: var(--ink); }
.sc-tab.active {
  color: var(--brand);
  border-bottom-color: var(--brand);
  font-weight: 700;
}
.sc-tab .t-num {
  display: block;
  font-size: 0.72rem;
  color: var(--ink-3);
  font-weight: 400;
  letter-spacing: 0.04em;
  margin-bottom: 4px;
}
.sc-tab.active .t-num { color: var(--brand); opacity: .85; }
.sc-tab .t-label {
  display: block;
  font-size: 0.92rem;
}
.sc-pane { display: none; padding-top: 30px; }
.sc-pane.active { display: block; }

/* ============================================================
   三段价值导向结构 · 每个 Pane 内：解决什么问题 / 为什么是我 / 你拿走什么
   ============================================================ */

/* ----- ① 这个判断解决什么问题（浅蓝条） ----- */
.sc-problem {
  width: min(760px, calc(100% - 32px));
  margin: 0 auto 14px;
  padding: 26px 30px;
  background: var(--brand-soft);
  border-left: 4px solid var(--brand);
  border-radius: 0 8px 8px 0;
}
.sc-problem .problem-eyebrow {
  margin: 0 0 12px;
  font-family: Arial, "Microsoft YaHei", "微软雅黑", sans-serif;
  color: var(--brand);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
}
.sc-problem h3 {
  margin: 0 0 14px;
  font-family: Arial, "Microsoft YaHei", "微软雅黑", sans-serif;
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--ink);
  line-height: 1.4;
}
.sc-problem > p {
  margin: 0;
  font-size: 0.95rem;
  color: var(--ink-2);
  line-height: 1.9;
}
.sc-problem > p b { color: var(--ink); font-weight: 700; }

/* ----- ② 为什么我讲、不买别的课（白底卡） ----- */
.sc-different {
  width: min(760px, calc(100% - 32px));
  margin: 0 auto 14px;
  padding: 22px 26px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
}
.sc-different .diff-eyebrow {
  margin: 0 0 14px;
  font-family: Arial, "Microsoft YaHei", "微软雅黑", sans-serif;
  color: var(--brand);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
}
.sc-diff-list {
  margin: 0;
  padding: 0;
  list-style: none;
}
.sc-diff-list li {
  padding: 10px 0 10px 22px;
  position: relative;
  font-size: 0.92rem;
  color: var(--ink-2);
  line-height: 1.85;
  border-bottom: 1px dashed var(--line-2);
}
.sc-diff-list li:last-child { border-bottom: none; }
.sc-diff-list li::before {
  content: "→";
  position: absolute;
  left: 4px;
  top: 10px;
  color: var(--brand);
  font-weight: 700;
}
.sc-diff-list li b { color: var(--ink); font-weight: 700; }

/* ----- ③ 你看完这一节能拿走的（暖黄底） ----- */
.sc-takeaway {
  width: min(760px, calc(100% - 32px));
  margin: 0 auto 14px;
  padding: 26px 30px;
  background: var(--highlight-warm);
  border-radius: 8px;
}
.sc-takeaway .take-eyebrow {
  margin: 0 0 16px;
  font-family: Arial, "Microsoft YaHei", "微软雅黑", sans-serif;
  color: var(--ink);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
}
.sc-take-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 12px;
}
.sc-take {
  padding: 18px 20px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
}
.sc-take > b {
  display: block;
  font-size: 0.98rem;
  color: var(--ink);
  font-weight: 700;
  margin-bottom: 8px;
  line-height: 1.4;
}
.sc-take p {
  margin: 0;
  font-size: 0.85rem;
  color: var(--ink-2);
  line-height: 1.75;
}

/* ----- ④ 微型预告（直接展示不折叠：让买家看到"有一点料"但不交底） ----- */
.sc-preview {
  width: min(760px, calc(100% - 32px));
  margin: 14px auto 0;
  padding: 20px 22px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
}
.sc-preview .preview-head {
  margin: 0 0 2px;
  font-size: 0.86rem;
  color: var(--ink);
  font-weight: 700;
  letter-spacing: 0.05em;
}
.sc-preview .preview-head::before {
  content: "▍";
  margin-right: 6px;
  color: var(--brand);
}
.sc-preview .preview-body {
  padding: 8px 0 0;
}
.sc-preview .preview-line {
  margin: 12px 0 0;
  padding-top: 12px;
  border-top: 1px dashed var(--line-2);
  font-size: 0.88rem;
  color: var(--ink-2);
  line-height: 1.85;
}
.sc-preview .preview-line:first-child { margin-top: 0; padding-top: 0; border-top: none; }
.sc-preview .preview-line b { color: var(--ink); font-weight: 700; }

/* ----- 它不是什么 ----- */
.sc-not {
  width: min(580px, calc(100% - 32px));
  margin: 0 auto;
  padding: 22px 24px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  text-align: center;
  color: var(--ink-2);
  font-size: 0.92rem;
  line-height: 1.85;
}

/* ----- 购买区 ----- */
.sc-buy {
  width: min(960px, calc(100% - 32px));
  margin: 60px auto 0;
  padding: 60px 0;
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: 1fr 360px;
  align-items: center;
  gap: 60px;
}
.sc-buy .section-tag {
  color: var(--brand);
  font-size: 0.85rem;
  font-weight: 700;
  margin-bottom: 14px;
  font-family: Arial, "Microsoft YaHei", "微软雅黑", sans-serif;
}
.sc-buy h2 {
  margin: 0 0 20px;
  font-size: 1.7rem;
  color: var(--ink);
  font-weight: 700;
  line-height: 1.3;
}
.sc-buy .plain-list { margin: 0; padding: 0; list-style: none; }
.sc-buy .plain-list li {
  padding-left: 18px;
  position: relative;
  font-size: 0.95rem;
  color: var(--ink-2);
  line-height: 1.9;
}
.sc-buy .plain-list li::before {
  content: "·";
  position: absolute;
  left: 4px;
  top: 0;
  color: var(--ink-3);
}

.sc-pricecard {
  padding: 24px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  text-align: center;
}
.sc-pricecard small {
  display: block;
  color: var(--ink-3);
  font-size: 0.85rem;
  margin-bottom: 6px;
}
.sc-pricecard strong {
  display: block;
  font-family: Arial, "Microsoft YaHei", "微软雅黑", sans-serif;
  font-size: 2.4rem;
  color: var(--ink);
  line-height: 1.1;
  margin: 8px 0 10px;
}
.sc-pricecard sup { font-size: 1.1rem; vertical-align: super; }
.sc-pricecard p { margin: 0 0 14px; color: var(--ink-2); font-size: 0.85rem; }
.sc-pricecard .primary-button {
  display: block;
  padding: 12px 20px;
  background: var(--brand);
  color: #fff;
  font-size: 0.95rem;
  font-weight: 700;
  border-radius: 8px;
  text-decoration: none;
}

/* ----- 响应式 ----- */
@media (max-width: 700px) {
  .sc-hero { padding: 40px 0 8px; }
  .sc-hero h1 { font-size: 1.6rem; }
  .sc-h { font-size: 1.25rem; }
  .sc-buy { grid-template-columns: 1fr; gap: 30px; padding: 40px 0; }
  .sc-buy h2 { font-size: 1.4rem; }
  .sc-tabs { grid-template-columns: 1fr; }
  .sc-tab { border-bottom: 1px solid var(--line-2); }
  .sc-tab.active { border-bottom-color: var(--brand); }
  .sc-take-grid { grid-template-columns: 1fr; }
  .sc-problem { padding: 20px 22px; }
  .sc-problem h3 { font-size: 1.15rem; }
}