/* v1.5 SEO entry pages */

.seo-v15 {
  background:
    radial-gradient(circle at 50% -10%, rgba(37, 99, 235, 0.08), transparent 32rem),
    var(--bg);
}

.seo-shell {
  max-width: 680px;
  padding-top: 0;
}

.seo-hero {
  margin: 0 -1rem 1rem;
  padding: calc(0.6rem + env(safe-area-inset-top)) 1rem 1.2rem;
  border-bottom-left-radius: 28px;
  border-bottom-right-radius: 28px;
  background: linear-gradient(160deg, var(--card), color-mix(in srgb, var(--primary) 7%, var(--card)));
  box-shadow: 0 10px 28px rgba(15, 23, 42, 0.06);
}

.seo-topline {
  min-height: 44px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.seo-brand {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--text);
  text-decoration: none;
  font-size: 0.8rem;
  font-weight: 800;
}

.seo-brand span {
  font-size: 1.3rem;
}

.seo-home-link {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  color: var(--muted);
  text-decoration: none;
  font-size: 0.76rem;
  font-weight: 700;
}

.seo-kicker {
  margin: 0.9rem 0 0.15rem;
  color: var(--primary);
  font-size: 0.7rem;
  font-weight: 900;
  letter-spacing: 0.08em;
}

.seo-hero h1 {
  margin: 0;
  font-size: clamp(1.45rem, 6vw, 2rem);
  line-height: 1.35;
}

.seo-lead {
  margin: 0.55rem 0 0;
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.7;
}

.seo-facts {
  margin-top: 1rem;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.5rem;
}

.seo-fact {
  min-height: 84px;
  padding: 0.65rem 0.35rem;
  border: 1px solid var(--border);
  border-radius: 14px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--card);
  text-align: center;
}

.seo-fact strong {
  font-size: 1.15rem;
  line-height: 1.1;
}

.seo-fact span {
  margin-top: 0.25rem;
  color: var(--muted);
  font-size: 0.62rem;
}

.seo-cta {
  margin-top: 1rem;
}

.seo-cta .btn {
  min-height: 54px;
  border-radius: 14px;
  font-size: 1rem;
}

.seo-cta-note {
  margin: 0.4rem 0 0;
  color: var(--muted);
  text-align: center;
  font-size: 0.68rem;
}

.seo-section {
  margin-bottom: 1rem;
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: var(--card);
  box-shadow: 0 5px 18px rgba(15, 23, 42, 0.04);
}

.seo-section h2 {
  margin: 0 0 0.65rem;
  font-size: 1.1rem;
  line-height: 1.5;
}

.seo-section h3 {
  margin: 1rem 0 0.35rem;
  font-size: 0.95rem;
}

.seo-section p,
.seo-section li {
  font-size: 0.84rem;
  line-height: 1.8;
}

.seo-section p {
  margin: 0.45rem 0;
}

.seo-section ul,
.seo-section ol {
  margin: 0.55rem 0;
  padding-left: 1.25rem;
}

.seo-highlight {
  border-color: color-mix(in srgb, var(--primary) 24%, var(--border));
  background: color-mix(in srgb, var(--primary) 4%, var(--card));
}

.seo-topic-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
  margin-top: 0.7rem;
}

.seo-topic {
  min-height: 58px;
  padding: 0.65rem;
  border-radius: 12px;
  background: var(--bg);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  font-size: 0.75rem;
  font-weight: 700;
  line-height: 1.45;
}

.seo-exam-table {
  width: 100%;
  margin-top: 0.6rem;
  border-collapse: collapse;
  font-size: 0.78rem;
}

.seo-exam-table th,
.seo-exam-table td {
  padding: 0.55rem 0.4rem;
  border-bottom: 1px solid var(--border);
  text-align: left;
}

.seo-exam-table th:last-child,
.seo-exam-table td:last-child {
  text-align: right;
  white-space: nowrap;
}

.seo-links {
  display: grid;
  gap: 0.55rem;
}

.seo-link-card {
  padding: 0.75rem;
  border: 1px solid var(--border);
  border-radius: 13px;
  display: block;
  color: var(--text);
  text-decoration: none;
  background: var(--bg);
}

.seo-link-card strong,
.seo-link-card span {
  display: block;
}

.seo-link-card strong {
  font-size: 0.84rem;
}

.seo-link-card span {
  margin-top: 0.15rem;
  color: var(--muted);
  font-size: 0.7rem;
}

.seo-source {
  padding-top: 0.65rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.72rem !important;
}

.seo-source a {
  color: var(--primary);
}

.seo-footer {
  margin-bottom: calc(1rem + env(safe-area-inset-bottom));
}

@media (max-width: 360px) {
  .seo-facts {
    gap: 0.35rem;
  }

  .seo-fact {
    padding-inline: 0.2rem;
  }

  .seo-topic-grid {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 700px) {
  .seo-shell {
    max-width: 720px;
  }
}


/* ===== v1.7 desktop SEO layout ===== */
@media (min-width: 900px) {
  .seo-v15 {
    background:
      radial-gradient(circle at 10% 8%, rgba(124, 153, 87, 0.08), transparent 28rem),
      radial-gradient(circle at 90% 9%, rgba(37, 99, 235, 0.07), transparent 24rem),
      #f8f7f3;
  }

  .seo-shell {
    max-width: 1020px;
    padding-top: 1rem;
    padding-bottom: 4rem;
  }

  .seo-hero {
    margin: 0 0 1.25rem;
    padding: 1.2rem 1.4rem 1.5rem;
    border: 1px solid var(--border);
    border-radius: 28px;
  }

  .seo-hero h1 {
    max-width: 760px;
    font-size: clamp(2rem, 3vw, 2.65rem);
  }

  .seo-lead {
    max-width: 820px;
    font-size: 0.96rem;
  }

  .seo-facts {
    max-width: 760px;
    gap: 0.75rem;
  }

  .seo-fact {
    min-height: 96px;
    border-radius: 16px;
  }

  .seo-fact strong {
    font-size: 1.35rem;
  }

  .seo-cta {
    max-width: 520px;
  }

  .seo-section {
    padding: 1.35rem 1.45rem;
    border-radius: 22px;
  }

  .seo-section h2 {
    font-size: 1.22rem;
  }

  .seo-section p,
  .seo-section li {
    font-size: 0.9rem;
  }

  .seo-topic-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 0.7rem;
  }

  .seo-topic {
    min-height: 72px;
    padding: 0.8rem;
  }

  .seo-links {
    grid-template-columns: repeat(3, 1fr);
    gap: 0.75rem;
  }

  .seo-link-card {
    min-height: 112px;
    padding: 0.9rem;
    transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
  }

  .seo-link-card:hover {
    transform: translateY(-2px);
    border-color: color-mix(in srgb, var(--primary) 30%, var(--border));
    box-shadow: 0 9px 20px rgba(15, 23, 42, 0.06);
  }

  .seo-footer {
    margin-bottom: 0;
  }
}