/* ============================================================
   knee-pain.css — 膝の痛み・変形性膝関節症ページ
   ============================================================ */

.knee-pain-page {
  background-color: var(--color-white);
}

.knee-pain-hero {
  padding-block: 0;
  background-color: var(--color-brand);
  color: var(--color-white);
}

.knee-pain-hero__inner {
  padding-block: clamp(1.5rem, 3vw, 3rem);
}

.knee-pain-hero__media {
  position: relative;
  overflow: hidden;
  min-height: clamp(28rem, 50vw, 40rem);
  margin: 0;
  border-radius: var(--radius-xl);
  box-shadow: 0 22px 56px rgb(0 0 0 / 0.18);
  isolation: isolate;
}

.knee-pain-hero__figure,
.knee-pain-hero__figure img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.knee-pain-hero__figure img {
  object-fit: cover;
  object-position: center 34%;
}

.knee-pain-hero__shade {
  display: none;
}

.knee-pain-hero__content {
  position: absolute;
  inset-block-start: clamp(1.25rem, 4vw, 4rem);
  inset-inline-start: clamp(1.25rem, 4vw, 4rem);
  z-index: 1;
  display: grid;
  gap: var(--space-4);
}

.knee-pain-hero__eyebrow {
  width: fit-content;
  padding: 0.5rem 0.9rem;
  border: 1px solid rgb(255 255 255 / 0.34);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.06em;
  text-shadow: 0 1px 10px rgb(0 0 0 / 0.16);
}

.knee-pain-hero__title {
  max-width: 11em;
  margin-block-end: 0;
  font-size: clamp(1.6rem, calc(0.8rem + 4vw), 2.8rem);
  font-weight: 900;
  line-height: 1.16;
  text-shadow: 0 1px 12px rgb(0 0 0 / 0.18);
}

.knee-pain-hero__title-line {
  display: block;
}

.knee-pain-hero__title-line:first-child {
  margin-block-end: 20px;
}

.knee-pain-intro {
  background-color: #edf9ff;
}

.knee-pain-intro__head {
  justify-items: center;
  text-align: center;
}

.knee-pain-intro__panel {
  display: grid;
  gap: var(--space-4);
  justify-items: center;
  padding-block: clamp(1.25rem, 2vw, 1.75rem);
  text-align: center;
}

.knee-pain-intro__lead {
  margin: 0;
  font-size: clamp(1.05rem, 1rem + 0.45vw, 1.4rem);
  font-weight: 900;
  line-height: 1.9;
  color: var(--color-brand);
  max-width: 60rem;
}

.knee-pain-intro__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  justify-content: center;
}

.knee-pain-section--alt {
  background-color: var(--color-bg-band);
}

.knee-pain-section__head {
  display: grid;
  gap: 0.25rem;
}

.knee-pain-section__head .section-head__en {
  justify-content: flex-start;
}

.knee-pain-section__head .section-head__ja {
  position: relative;
  width: fit-content;
  max-width: 100%;
  padding-block-end: 0.85rem;
  font-size: var(--text-3xl);
  line-height: 1.45;
}

.knee-pain-section__head .section-head__ja::after {
  content: "";
  position: absolute;
  inset-inline-start: 0;
  inset-block-end: 0;
  width: min(6.5rem, 38%);
  height: 3px;
  border-radius: var(--radius-full);
  background-color: var(--color-brand-light);
}

.knee-pain-panel {
  padding: clamp(1.25rem, 1.8vw, 2rem);
  border-radius: var(--radius-lg);
  background-color: var(--color-white);
  box-shadow: var(--shadow-card);
}

.knee-pain-copy {
  display: grid;
  gap: var(--space-4);
  color: var(--color-ink);
}

.knee-pain-copy--columns {
  display: block;
  max-width: none;
  column-count: 2;
  column-gap: 1.5rem;
  margin-block-start: 0;
  margin-block-end: 10px;
}

.knee-pain-copy p {
  margin: 0;
  line-height: 1.95;
}

.knee-pain-copy--columns p {
  break-inside: avoid;
  margin-block-end: var(--space-3);
}

.knee-pain-copy--columns p:last-child {
  margin-block-end: 0;
}

.knee-pain-copy__figure {
  break-inside: avoid;
  margin: 0 0 var(--space-4);
  overflow: hidden;
  border-radius: var(--radius-lg);
  background-color: var(--color-bg-light);
  box-shadow: var(--shadow-image);
}

.knee-pain-copy__figure img {
  display: block;
  width: 100%;
  height: auto;
}

.knee-pain-copy strong {
  font-weight: 900;
}

.knee-pain-list {
  display: grid;
  gap: 0.7rem;
  margin: 0.2rem 0 0.4rem;
  padding: 0;
}

.knee-pain-list li {
  position: relative;
  padding: 0.85rem 1rem 0.85rem 2.6rem;
  border-radius: var(--radius-md);
  background-color: rgb(var(--color-brand-rgb) / 0.045);
  box-shadow: inset 0 0 0 1px rgb(var(--color-brand-rgb) / 0.08);
  font-weight: 700;
  line-height: 1.8;
}

@media (min-width: 768px) {
  .knee-pain-list li {
    justify-self: start;
    width: min(100%, 37rem);
  }
}

.knee-pain-list li::before {
  content: "";
  position: absolute;
  inset-block-start: 1.5rem;
  inset-inline-start: 1rem;
  width: 0.7rem;
  height: 0.7rem;
  border-radius: 50%;
  background-color: var(--color-brand);
  box-shadow: 0 0 0 0.28rem rgb(var(--color-brand-rgb) / 0.12);
}

.knee-pain-steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.knee-pain-step {
  padding: 1.5rem;
  border: 1px solid rgb(var(--color-brand-rgb) / 0.08);
  border-radius: var(--radius-lg);
  background-color: var(--color-white);
  box-shadow: var(--shadow-card);
}

.knee-pain-step > .knee-pain-step__num {
  width: fit-content;
  margin-block-end: var(--space-2);
  padding: 0.4rem 1rem;
  border-radius: var(--radius-full);
  background-color: rgb(var(--color-brand-rgb) / 0.08);
  color: var(--color-brand);
  font-size: var(--text-sm);
  font-weight: 900;
  line-height: 1;
}

.knee-pain-step__num + :is(h3, p) {
  margin-block-start: 0;
}

.knee-pain-step h3 {
  position: relative;
  margin-block-end: var(--space-4);
  padding-inline-start: 0.9rem;
  font-size: var(--text-lg);
  font-weight: 900;
  line-height: 1.5;
  color: var(--color-brand);
}

.knee-pain-step h3::before {
  content: "";
  position: absolute;
  inset-block: 0.35em;
  inset-inline-start: 0;
  width: 4px;
  border-radius: var(--radius-full);
  background-color: var(--color-brand-mid);
}

.knee-pain-step p,
.knee-pain-treatment-card p {
  margin: 0;
  line-height: 1.9;
}

.knee-pain-faq {
  display: grid;
  gap: 0.875rem;
}

.knee-pain-faq__item {
  overflow: hidden;
  border: 1px solid rgb(var(--color-brand-rgb) / 0.1);
  border-radius: var(--radius-lg);
  background-color: var(--color-white);
  box-shadow: var(--shadow-card);
}

.knee-pain-faq__item summary {
  position: relative;
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 3.25rem 1rem 1.25rem;
  font-weight: 900;
  line-height: 1.7;
  cursor: pointer;
  list-style: none;
}

.knee-pain-faq__item summary::-webkit-details-marker {
  display: none;
}

.knee-pain-faq__item summary::after {
  content: "+";
  position: absolute;
  inset-inline-end: 1.1rem;
  inset-block-start: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.9rem;
  height: 1.9rem;
  border-radius: var(--radius-full);
  background-color: rgb(var(--color-brand-rgb) / 0.08);
  color: var(--color-brand);
  font-size: 1.2rem;
  font-weight: 900;
  transform: translateY(-50%);
}

.knee-pain-faq__item[open] summary::after {
  content: "−";
}

.knee-pain-faq__body {
  padding: 0 1.25rem 1.2rem;
}

.knee-pain-faq__body p {
  margin: 0;
  line-height: 1.9;
}

@media (max-width: 900px) {
  .knee-pain-hero__media {
    min-height: 24rem;
  }

  .knee-pain-hero__content {
    max-width: min(34rem, calc(100% - 2rem));
  }

  .knee-pain-steps {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 767px) {
  .knee-pain-hero__inner {
    padding-block: var(--space-4);
  }

  .knee-pain-hero__media {
    min-height: 20rem;
  }

  .knee-pain-hero__content {
    inset-inline-start: var(--space-4);
    inset-block-start: var(--space-4);
    max-width: none;
    gap: 0.75rem;
  }

  .knee-pain-hero__eyebrow {
    padding-inline: 0.75rem;
  }

  .knee-pain-intro__actions {
    gap: 0.75rem;
  }

  .knee-pain-intro__panel {
    padding-inline: var(--space-4);
  }

  .knee-pain-list li {
    padding-inline-start: 2.45rem;
  }

  .knee-pain-copy--columns {
    column-count: 1;
  }

  .knee-pain-step,
  .knee-pain-treatment-card {
    padding: 1.25rem;
  }

  .knee-pain-faq__item summary {
    padding-inline-end: 3rem;
  }
}