.series-hub {
  max-width: 1120px;
  margin: 0 auto;
  padding: 1rem 0 4rem;
}

.series-hub__crumb {
  display: flex;
  gap: 0.55rem;
  align-items: center;
  margin: 0 0 1.5rem;
  font-size: 0.9rem;
  color: #73808c;
}

.series-hub__crumb a {
  text-decoration: none;
  font-weight: 700;
}

.series-hub__hero {
  padding: 2.75rem;
  margin-bottom: 2rem;
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: 22px;
  background: linear-gradient(145deg, #f8fbff, #ffffff 60%);
}

.series-hub__kicker,
.series-stage__range {
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
}

.series-hub__hero h1 {
  max-width: 900px;
  margin: 0.45rem 0 0.8rem;
  font-size: clamp(2.35rem, 5vw, 4.6rem);
  line-height: 1;
  letter-spacing: -0.045em;
}

.series-hub__description {
  max-width: 800px;
  margin: 0;
  font-size: 1.2rem;
  line-height: 1.6;
  color: #465361;
}

.series-hub__copy {
  max-width: 800px;
  margin-top: 0.8rem;
  color: #63707c;
}

.series-hub__meta,
.series-hub__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
}

.series-hub__meta {
  margin-top: 1.35rem;
}

.series-hub__meta span {
  padding: 0.45rem 0.7rem;
  border-radius: 999px;
  background: #eef3f8;
  font-size: 0.82rem;
  font-weight: 700;
  color: #52606d;
}

.series-hub__actions {
  margin-top: 1.35rem;
}

.series-hub__start,
.series-hub__prompt {
  display: inline-flex;
  padding: 0.7rem 1rem;
  border-radius: 10px;
  font-weight: 800;
  text-decoration: none !important;
}

.series-hub__start {
  background: #17202a;
  color: #fff !important;
}

.series-hub__start:hover {
  background: var(--accent);
}

.series-hub__prompt {
  border: 1px solid rgba(57, 120, 197, 0.3);
  background: #eef5fc;
  color: var(--accent) !important;
}

.series-hub__prompt:hover {
  border-color: var(--accent);
  background: #e2eef9;
}

.series-stages {
  display: grid;
  gap: 1.4rem;
}

.series-stage {
  overflow: hidden;
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: 18px;
  background: #fff;
}

.series-stage__header {
  display: grid;
  grid-template-columns: minmax(240px, 0.9fr) minmax(260px, 1.1fr);
  gap: 1.5rem;
  padding: 1.35rem 1.5rem;
  border-bottom: 1px solid rgba(0, 0, 0, 0.07);
  background: #f7f9fb;
}

.series-stage__header h2 {
  margin: 0.25rem 0 0;
  font-size: 1.3rem;
}

.series-stage__header p {
  margin: 0;
  color: #596672;
  line-height: 1.55;
}

.series-chapters {
  list-style: none;
  margin: 0;
  padding: 0;
}

.series-chapter + .series-chapter {
  border-top: 1px solid rgba(0, 0, 0, 0.06);
}

.series-chapter a {
  display: grid;
  grid-template-columns: 52px 1fr;
  gap: 0.9rem;
  align-items: baseline;
  padding: 0.9rem 1.5rem;
  color: #202a33;
  text-decoration: none;
}

.series-chapter a:hover {
  background: #f8fbfe;
  color: var(--accent);
}

.series-chapter__step {
  font-size: 0.8rem;
  font-weight: 800;
  color: #84909b;
}

.series-hub__footer {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 2rem;
  padding-top: 1.2rem;
  border-top: 1px solid rgba(0, 0, 0, 0.08);
  color: #77838d;
  font-size: 0.9rem;
}

.series-hub__footer a {
  font-weight: 700;
  text-decoration: none;
}

.series-identity {
  margin-bottom: 1rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid rgba(0, 0, 0, 0.08);
}

.series-identity__trail,
.series-identity__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.55rem;
}

.series-identity__trail {
  margin-bottom: 0.45rem;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #7a8691;
}

.series-identity__trail a {
  color: var(--accent);
  text-decoration: none;
}

.series-identity__meta {
  font-size: 0.84rem;
  color: #697681;
}

.series-identity__stage {
  font-weight: 750;
  color: #3e4b57;
}

.series-reader {
  margin: 0 0 1.6rem;
  padding: 1rem 1.1rem;
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: 14px;
  background: #f8fafc;
}

.main + .series-reader,
.series-reader + .authorbox {
  margin-top: 1.5rem;
}

.series-reader__topline {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: baseline;
}

.series-reader__series,
.series-reader__continue {
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.series-reader__series {
  text-decoration: none;
  color: var(--accent);
}

.series-reader__continue {
  color: #75818c;
}

.series-reader__progress {
  height: 4px;
  margin: 0.8rem 0 0.9rem;
  overflow: hidden;
  border-radius: 999px;
  background: #e3e8ed;
}

.series-reader__progress span {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: var(--accent);
}

.series-reader__links {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.2rem;
}

.series-reader__links > div {
  min-width: 0;
}

.series-reader__links > div > span {
  display: block;
  margin-bottom: 0.2rem;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #8a949d;
}

.series-reader__links a {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
}

.series-reader__next {
  text-align: right;
}

@media (max-width: 768px) {
  .series-hub__hero {
    padding: 1.6rem;
  }

  .series-stage__header {
    grid-template-columns: 1fr;
    gap: 0.65rem;
  }

  .series-chapter a {
    grid-template-columns: 40px 1fr;
    padding: 0.85rem 1rem;
  }

  .series-hub__footer {
    flex-direction: column;
  }

  .series-reader__topline,
  .series-reader__links {
    grid-template-columns: 1fr;
    display: grid;
  }

  .series-reader__next {
    text-align: left;
  }

  .series-reader__links a {
    white-space: normal;
  }
}