:root {
    --bg: #f5f0e6;        /* 暖米白 */
    --ink: #2d2a24;       /* 深炭 */
    --body: #5a5349;      /* 暖灰 */
    --accent: #b85c3a;    /* 锈红 */
    --green: #6b8f71;     /* 雾绿 */
    --brown: #7a6a5a;     /* 暖棕 */
    --line: #c8c0b4;      /* 边框 */
    --line-soft: #e2d9c9; /* 浅边框 */
    --card: #f0ebe2;      /* 浅米卡片 */
    --bubble: #ede5d6;    /* 气泡浅底 */
    --font-display: "Noto Serif SC", "Noto Serif CJK SC", "Source Han Serif SC", "Songti SC", serif;
    --font-body: "Noto Sans CJK SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  }

  * { margin: 0; padding: 0; box-sizing: border-box; }

  body {
    background: var(--bg);
    color: var(--body);
    font-family: var(--font-body);
    font-size: 17px;
    line-height: 1.8;
    -webkit-font-smoothing: antialiased;
  }

  .wrap { max-width: 960px; margin: 0 auto; padding: 0 28px; }

  /* ============ HERO（封面作背景） ============ */
  .hero {
    position: relative;
    min-height: 700px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    overflow: hidden;
  }
  .hero-bg {
    position: absolute;
    inset: 0;
    background-image: url('cover-web.jpg');
    background-size: cover;
    background-position: center 22%;
  }
  .hero-bg::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(to bottom,
      rgba(245,240,230,.96) 0%,
      rgba(245,240,230,.90) 30%,
      rgba(245,240,230,.86) 50%,
      rgba(245,240,230,.82) 65%,
      rgba(245,240,230,.97) 100%);
  }
  .hero .wrap { position: relative; z-index: 1; padding-top: 40px; }
  .series-tag {
    font-size: 14px;
    color: var(--brown);
    letter-spacing: 0.12em;
    margin-bottom: 28px;
  }
  .series-tag .dot { color: var(--accent); }
  h1 {
    font-size: clamp(44px, 6.5vw, 64px);
    font-weight: 800;
    font-family: var(--font-display);
    color: var(--ink);
    letter-spacing: 0.06em;
    line-height: 1.25;
    margin-bottom: 26px;
  }
  .tagline {
    font-size: clamp(16px, 2.2vw, 20px);
    color: var(--body);
    max-width: 520px;
    margin: 0 auto 46px;
  }
  .cta-row {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
  }
  .cta {
    display: inline-block;
    background: var(--accent);
    color: #fff;
    font-size: 18px;
    font-weight: 600;
    padding: 13px 38px;
    border-radius: 10px;
    text-decoration: none;
    box-shadow: 0 1px 0 rgba(0,0,0,.12), 0 6px 18px rgba(184,92,58,.28);
    transition: transform .12s ease, box-shadow .12s ease;
  }
  .cta:hover { transform: translateY(-1px); box-shadow: 0 1px 0 rgba(0,0,0,.12), 0 8px 22px rgba(184,92,58,.34); }
  .cta-sub {
    font-size: 13px;
    color: var(--brown);
  }

  /* ============ PAIN ============ */
  .pain { padding: 112px 0 96px; }
  .pain .inner {
    max-width: 660px;
    margin: 0 auto;
    text-align: center;
  }
  .eyebrow {
    font-size: 13px;
    color: var(--accent);
    letter-spacing: 0.16em;
    margin-bottom: 28px;
    font-weight: 600;
  }
  .pain h2 {
    font-size: clamp(24px, 3.6vw, 32px);
    font-weight: 700;
    font-family: var(--font-display);
    color: var(--ink);
    line-height: 1.5;
    margin-bottom: 34px;
  }
  .pain p {
    font-size: 17px;
    color: var(--body);
  }
  .pain .problem {
    font-size: 19px;
    color: var(--ink);
    font-weight: 500;
    margin-bottom: 30px;
    line-height: 1.9;
    font-family: "Kaiti SC", "STKaiti", "KaiTi", serif;
  }
  .pain .promise {
    line-height: 1.9;
  }
  .pain .promise .hl {
    color: var(--accent);
    font-weight: 600;
  }
  .pain .q { color: var(--ink); font-weight: 600; }

  /* ============ STATIONS (八讲) ============ */
  .stations {
    background: var(--card);
    padding: 112px 0 116px;
    border-top: 1px solid var(--line-soft);
    border-bottom: 1px solid var(--line-soft);
  }
  .stations .head { text-align: center; margin-bottom: 60px; }
  .stations h2 {
    font-size: clamp(24px, 3.6vw, 32px);
    font-weight: 700;
    font-family: var(--font-display);
    color: var(--ink);
    line-height: 1.4;
    margin-bottom: 10px;
  }
  .stations .sub {
    font-size: 15px;
    color: var(--brown);
  }

  .line-wrap {
    position: relative;
    max-width: 620px;
    margin: 0 auto;
    padding-left: 58px;
  }
  .rail {
    position: absolute;
    left: 16.5px;
    top: 8px;
    bottom: 40px;
    width: 3px;
    background: var(--line-soft);
    border-radius: 2px;
  }
  .station {
    position: relative;
    margin-bottom: 28px;
  }
  .node {
    position: absolute;
    left: -58px;
    top: 18px;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--accent);
    color: #fff;
    font-size: 15px;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 0 0 6px var(--card);
  }
  .node.done { background: var(--green); }
  .st-card {
    background: var(--bg);
    border: 1px solid var(--line-soft);
    border-radius: 12px;
    padding: 20px 28px;
  }
  .st-card .st-title {
    font-size: 19px;
    font-weight: 600;
    font-family: var(--font-display);
    color: var(--ink);
    margin-bottom: 3px;
  }
  .st-card .st-kw {
    font-size: 15px;
    color: var(--body);
  }
  .st-card .st-kw .hl { color: var(--accent); font-weight: 600; }

  /* ============ TEACHER ============ */
  .teacher { padding: 112px 0 96px; }
  .teacher .inner {
    max-width: 720px;
    margin: 0 auto;
    display: flex;
    gap: 44px;
    align-items: flex-start;
  }
  .avatar {
    flex-shrink: 0;
    width: 104px;
    height: 104px;
    border-radius: 50%;
    border: 1px solid var(--line);
    overflow: hidden;
    background: var(--bubble);
  }
  .avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
  }
  .teacher h2 {
    font-size: 26px;
    font-weight: 700;
    font-family: var(--font-display);
    color: var(--ink);
    line-height: 1.4;
    margin-bottom: 6px;
  }
  .teacher .who {
    font-size: 15px;
    color: var(--brown);
    margin-bottom: 14px;
  }
  .teacher p {
    font-size: 15px;
    color: var(--body);
    margin-bottom: 18px;
  }
  .teacher p a {
    color: var(--accent);
    text-decoration: none;
    border-bottom: 1px solid rgba(184,92,58,.4);
  }
  .teacher p a:hover { border-bottom-color: var(--accent); }
  .stats {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
  }
  .stat {
    background: var(--card);
    border: 1px solid var(--line-soft);
    border-radius: 8px;
    padding: 10px 16px;
    font-size: 14px;
    color: var(--body);
    text-decoration: none;
    transition: border-color .12s ease, background .12s ease;
  }
  .stat:hover {
    border-color: var(--accent);
    background: var(--bubble);
  }
  .stat b {
    color: var(--accent);
    font-size: 15px;
    font-weight: 700;
  }
  .verify {
    font-size: 13px;
    color: var(--brown);
    margin-top: 14px;
  }

  /* ============ TAKEAWAY ============ */
  .takeaway {
    background: var(--card);
    border-top: 1px solid var(--line-soft);
    border-bottom: 1px solid var(--line-soft);
    padding: 176px 0;
  }
  .takeaway .inner {
    max-width: 680px;
    margin: 0 auto;
    text-align: center;
  }
  .takeaway .label {
    font-size: 13px;
    color: var(--accent);
    letter-spacing: 0.16em;
    font-weight: 600;
    margin-bottom: 28px;
  }
  .takeaway .text {
    font-size: clamp(24px, 3.6vw, 32px);
    font-weight: 700;
    font-family: var(--font-display);
    color: var(--ink);
    line-height: 1.5;
    margin-bottom: 22px;
  }
  .takeaway .desc {
    font-size: 17px;
    line-height: 1.9;
  }

  /* ============ PRICE ============ */
  .price { padding: 112px 0; }
  .price .card {
    max-width: 520px;
    margin: 0 auto;
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 16px;
    padding: 56px 48px;
    text-align: center;
  }
  .price .old {
    font-size: 15px;
    color: var(--brown);
    text-decoration: line-through;
    margin-bottom: 10px;
  }
  .price .now {
    font-size: 48px;
    font-weight: 800;
    font-family: var(--font-display);
    color: var(--accent);
    line-height: 1.25;
  }
  .price .now small {
    font-size: 20px;
    font-weight: 600;
  }
  .price .note {
    font-size: 13px;
    color: var(--brown);
    margin: 10px 0 32px;
  }
  .price .cta {
    font-size: 18px;
    padding: 14px 46px;
    margin-bottom: 24px;
  }
  .price ul {
    list-style: none;
    text-align: left;
    font-size: 14px;
    color: var(--body);
    border-top: 1px solid var(--line-soft);
    padding-top: 18px;
  }
  .price ul li {
    padding: 4px 0 4px 24px;
    position: relative;
  }
  .price ul li::before {
    content: "";
    position: absolute;
    left: 4px;
    top: 13px;
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--green);
  }

  /* ============ FAQ ============ */
  .faq {
    background: var(--card);
    border-top: 1px solid var(--line-soft);
    padding: 112px 0;
  }
  .faq h2 {
    text-align: center;
    font-size: clamp(24px, 3.6vw, 32px);
    font-weight: 700;
    font-family: var(--font-display);
    color: var(--ink);
    line-height: 1.4;
    margin-bottom: 44px;
  }
  .faq-list { max-width: 640px; margin: 0 auto; }
  .faq-item {
    border-bottom: 1px solid var(--line-soft);
    padding: 28px 4px;
  }
  .faq-item:first-child { border-top: 1px solid var(--line-soft); }
  .faq-item .q {
    font-size: 17px;
    font-weight: 600;
    font-family: var(--font-display);
    color: var(--ink);
    margin-bottom: 5px;
    padding-left: 22px;
    position: relative;
  }
  .faq-item .q::before {
    content: "问";
    position: absolute;
    left: 0;
    top: 3px;
    font-size: 11px;
    font-weight: 600;
    color: var(--accent);
    border: 1px solid var(--accent);
    border-radius: 4px;
    padding: 0 4px;
    line-height: 1.5;
  }
  .faq-item .a {
    font-size: 15px;
    color: var(--body);
    padding-left: 22px;
  }

  /* ============ FOOTER ============ */
  footer {
    padding: 56px 0 72px;
    text-align: center;
  }
  footer .series {
    font-size: 15px;
    color: var(--body);
    letter-spacing: 0.08em;
    margin-bottom: 6px;
  }
  footer .next {
    font-size: 13px;
    color: var(--brown);
    margin-bottom: 14px;
  }
  footer .brand {
    font-size: 14px;
    color: var(--brown);
    letter-spacing: 0.3em;
  }

  @media (max-width: 640px) {
    .pain h2 br { display: none; }
    .rail { bottom: 88px; }
    .teacher .inner { flex-direction: column; align-items: center; text-align: center; }
    .stats { justify-content: center; }
    .price .card { padding: 36px 24px; }
    .hero { min-height: 560px; }
  }

/* ===== 系列三站概览 ===== */
.series-map { padding: 112px 0 100px; }
.series-map .head { text-align: center; margin-bottom: 60px; }
.series-map h2 {
  font-size: clamp(24px, 3.6vw, 32px);
  font-weight: 700;
  font-family: var(--font-display);
  color: var(--ink);
  line-height: 1.4;
  margin-bottom: 10px;
}
.series-map .sub { font-size: 15px; color: var(--brown); }
.series-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.scard {
  background: var(--bg);
  border: 1px solid var(--line-soft);
  border-radius: 14px;
  padding: 28px 26px;
  display: flex;
  flex-direction: column;
  transition: border-color .15s ease;
}
.scard.current { border-color: var(--line); }
.scard-tag {
  font-size: 13px;
  color: var(--accent);
  letter-spacing: 0.08em;
  font-weight: 600;
  margin-bottom: 14px;
}
.scard-title {
  font-size: 22px;
  font-weight: 700;
  font-family: var(--font-display);
  color: var(--ink);
  margin-bottom: 10px;
}
.scard-desc {
  font-size: 15px;
  color: var(--body);
  line-height: 1.8;
  flex-grow: 1;
  margin-bottom: 18px;
}
.scard-foot {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  border-top: 1px solid var(--line-soft);
  padding-top: 14px;
  margin-bottom: 18px;
}
.scard-foot b {
  font-size: 18px;
  color: var(--accent);
  font-weight: 800;
}
.scard-foot span { font-size: 13px; color: var(--brown); }
.scard .cta {
  display: block;
  text-align: center;
  font-size: 16px;
  padding: 11px 0;
}
@media (max-width: 860px) {
  .series-cards { grid-template-columns: 1fr; }
}