/* ========================================
   PRODUCT DETAIL PAGE (shared by 3 products)
   ======================================== */

.pd-hero {
  padding: 200px 0 100px;
  text-align: center;
}

.pd-hero__content {
  max-width: 780px;
  margin: 0 auto;
}

.pd-hero__layer {
  display: inline-block;
  padding: 6px 16px;
  border-radius: 100px;
  background: var(--accent-light);
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.pd-hero h1 {
  font-family: var(--serif);
  font-size: clamp(2.75rem, 6vw, 4.5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.05;
  color: var(--ink);
  margin: 20px 0 0;
}

.pd-hero h1 p { margin: 0; }

.pd-hero__role {
  margin: 20px auto 0;
  max-width: 560px;
  font-size: 1.1875rem;
  line-height: 1.6;
  color: var(--ink-light);
}

.pd-hero__actions { margin-top: 32px; }

/* --- Problem --- */
.pd-problem__body {
  font-size: 1.3125rem;
  line-height: 1.6;
  color: var(--ink);
  text-align: center;
  max-width: 720px;
  margin: 0 auto;
}

/* --- Mechanism --- */
.pd-mechanism__visual {
  max-width: 900px;
  margin: 0 auto 48px;
}

.pd-mechanism__visual img {
  width: 100%;
  border-radius: 8px;
  border: 1px solid var(--paper-border);
}

.pd-mechanism__steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}

.pd-mechanism__step {
  padding: 28px;
  border: 1px solid var(--paper-border);
  border-radius: 6px;
  background: var(--white);
}

.pd-mechanism__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--ink);
  color: var(--white);
  font-weight: 700;
  margin-bottom: 14px;
}

.pd-mechanism__step h3 {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 8px;
}

.pd-mechanism__step p,
.pd-capability p {
  font-size: 0.9375rem;
  line-height: 1.55;
  color: var(--ink-light);
}

/* --- Capabilities --- */
.pd-capabilities__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}

.pd-capability {
  padding: 32px 28px;
  border: 1px solid var(--paper-border);
  border-radius: 6px;
  background: var(--white);
}

.pd-capability__icon {
  width: 40px;
  height: 40px;
  color: var(--accent);
  margin-bottom: 16px;
}

.pd-capability h3 {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 8px;
}

/* --- Proof --- */
.pd-proof__card {
  text-align: center;
  padding: 64px 56px;
  border-radius: 10px;
  background: var(--paper-dark);
  border: 1px solid var(--paper-border);
}

.pd-proof__stat-value {
  display: block;
  font-family: var(--serif);
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 800;
  color: var(--accent);
  letter-spacing: -0.02em;
}

.pd-proof__stat-label {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-muted);
  margin-top: 8px;
}

.pd-proof__quote {
  margin: 28px auto 0;
  max-width: 640px;
  font-family: var(--serif);
  font-size: 1.375rem;
  line-height: 1.5;
  color: var(--ink);
}

.pd-proof__cite {
  display: block;
  margin-top: 16px;
  font-size: 0.9375rem;
  font-style: normal;
  color: var(--ink-muted);
}

/* --- Cross links --- */
.pd-cross-links__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
}

.pd-cross-link {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 28px;
  border: 1px solid var(--paper-border);
  border-radius: 6px;
  background: var(--white);
  transition: transform 0.3s ease, border-color 0.3s ease;
}

.pd-cross-link:hover {
  transform: translateY(-3px);
  border-color: var(--accent);
}

.pd-cross-link__label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--ink);
}

.pd-cross-link__desc {
  font-size: 0.9375rem;
  line-height: 1.5;
  color: var(--ink-light);
}

/* --- Security note --- */
.pd-security-note__card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  padding: 40px 48px;
  border-radius: 10px;
  border: 1px solid var(--paper-border);
  background: var(--white);
  flex-wrap: wrap;
}

.pd-security-note__text h2 {
  font-family: var(--serif);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 8px;
}

.pd-security-note__text h2 p { margin: 0; }

.pd-security-note__text p {
  font-size: 0.9375rem;
  line-height: 1.55;
  color: var(--ink-light);
  max-width: 560px;
}

@media (max-width: 768px) {
  .pd-hero { padding: 150px 0 70px; }
  .pd-proof__card { padding: 44px 28px; }
  .pd-security-note__card { padding: 32px 28px; }
}