.soundbar-playbook {
  max-width: 1140px;
  margin: 0 auto;
  padding: 30px 18px;
  color: #1f1f1f;
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.75;
}

.soundbar-playbook h1 {
  font-size: 44px;
  line-height: 1.16;
  color: #111;
  margin: 16px 0 18px;
}

.soundbar-playbook h2 {
  font-size: 30px;
  color: #111;
  margin: 46px 0 16px;
}

.soundbar-playbook h3 {
  font-size: 22px;
  color: #111;
  margin: 28px 0 10px;
}

.soundbar-playbook p,
.soundbar-playbook li {
  font-size: 16px;
}

.soundbar-playbook a {
  color: #d71920;
  text-decoration: none;
  font-weight: 700;
}

.spb-cover {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 28px;
  align-items: stretch;
  margin-bottom: 36px;
}

.spb-cover-main {
  background: #111;
  color: #fff;
  border-radius: 28px;
  padding: 40px 34px;
}

.spb-cover-main h1 {
  color: #fff;
}

.spb-cover-main p {
  color: #f2f2f2;
  font-size: 17px;
  max-width: 760px;
}

.spb-label {
  display: inline-block;
  color: #fff;
  background: #d71920;
  padding: 7px 14px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .04em;
  text-transform: uppercase;
}

.spb-cover-side {
  background: #f5f5f5;
  border: 1px solid #e7e7e7;
  border-radius: 28px;
  padding: 28px;
}

.spb-cover-side strong {
  display: block;
  font-size: 20px;
  color: #111;
  margin-bottom: 10px;
}

.spb-mini-list {
  padding-left: 18px;
  margin: 12px 0 0;
}

.spb-section-note {
  background: #fff6f6;
  border-left: 5px solid #d71920;
  border-radius: 0 18px 18px 0;
  padding: 20px 22px;
  margin: 26px 0;
}

.spb-phase {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 22px;
  margin: 24px 0;
  padding: 24px;
  border: 1px solid #e8e8e8;
  border-radius: 22px;
  background: #fff;
  box-shadow: 0 12px 28px rgba(0,0,0,0.04);
}

.spb-phase-number {
  width: 84px;
  height: 84px;
  border-radius: 24px;
  background: #111;
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 34px;
  font-weight: 800;
}

.spb-phase h3 {
  margin-top: 0;
}

.spb-board {
  background: #f7f7f7;
  border-radius: 26px;
  padding: 28px;
  margin: 34px 0;
}

.spb-board-title {
  font-size: 24px;
  font-weight: 800;
  color: #111;
  margin-bottom: 14px;
}

.spb-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-top: 18px;
}

.spb-card {
  background: #fff;
  border: 1px solid #e7e7e7;
  border-radius: 18px;
  padding: 22px;
}

.spb-card strong {
  display: block;
  font-size: 18px;
  color: #111;
  margin-bottom: 8px;
}

.spb-table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  border-radius: 18px;
  overflow: hidden;
}

.spb-table th {
  background: #111;
  color: #fff;
  padding: 15px;
  text-align: left;
  font-size: 15px;
}

.spb-table td {
  border: 1px solid #e5e5e5;
  padding: 15px;
  vertical-align: top;
  font-size: 15px;
}

.spb-table tr:nth-child(even) td {
  background: #fafafa;
}

.spb-brief {
  background: #111;
  color: #fff;
  border-radius: 26px;
  padding: 30px;
  margin: 40px 0;
}

.spb-brief h2 {
  color: #fff;
  margin-top: 0;
}

.spb-brief p,
.spb-brief li {
  color: #f2f2f2;
}

.spb-product-strip {
  background: #f6f6f6;
  border-radius: 26px;
  padding: 30px;
  margin: 42px 0;
}

.spb-link-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-top: 18px;
}

.spb-link-grid a {
  display: block;
  background: #fff;
  border: 1px solid #e6e6e6;
  border-radius: 15px;
  padding: 15px;
}

.spb-cta {
  background: linear-gradient(135deg, #111 0%, #2b2b2b 55%, #d71920 135%);
  color: #fff;
  border-radius: 28px;
  padding: 36px 28px;
  margin: 46px 0;
  text-align: center;
}

.spb-cta h2 {
  color: #fff;
  margin-top: 0;
}

.spb-cta p {
  color: #f2f2f2;
  max-width: 780px;
  margin-left: auto;
  margin-right: auto;
}

.spb-cta a {
  display: inline-block;
  margin-top: 12px;
  background: #fff;
  color: #111;
  padding: 13px 28px;
  border-radius: 999px;
}

.spb-faq {
  border-top: 1px solid #e5e5e5;
  padding-top: 18px;
}

@media (max-width: 768px) {
  .soundbar-playbook {
    padding: 22px 14px;
  }

  .soundbar-playbook h1 {
    font-size: 30px;
  }

  .soundbar-playbook h2 {
    font-size: 24px;
  }

  .spb-cover,
  .spb-phase,
  .spb-cards,
  .spb-link-grid {
    grid-template-columns: 1fr;
  }

  .spb-cover-main,
  .spb-cover-side,
  .spb-board,
  .spb-brief,
  .spb-product-strip,
  .spb-cta {
    padding: 24px 18px;
  }

  .spb-phase-number {
    width: 66px;
    height: 66px;
    font-size: 26px;
  }

  .spb-table,
  .spb-table tbody,
  .spb-table tr,
  .spb-table td,
  .spb-table th {
    display: block;
    width: 100%;
  }

  .spb-table th {
    display: none;
  }
}