/* ========== Mobile-first 基礎樣式 ========== */
:root {
  --pm-maxw: 760px; /* 版寬上限，跟容器走 */
  --pm-gap: 16px;
  --pm-radius: 12px;
  --pm-ease: cubic-bezier(0.2, 0.7, 0.2, 1);
  --pm-shadow: 0 6px 16px rgba(0, 0, 0, 0.06);
  --pm-accent: #3e3b7a;
}
.pm-section {
  padding: 24px 16px 40px;
}
.pm-container {
  max-width: var(--pm-maxw);
  margin: 0 auto;
}
.pm-block + .pm-block {
  margin-top: 56px;
}

.pm-figure {
  margin: 0 0 12px;
}
.pm-img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 8px;
  box-shadow: var(--pm-shadow);
}

.pm-title {
  font-size: clamp(20px, 4.8vw, 28px);
  font-weight: 600;
  text-align: center;
  margin: 12px 0 6px;
}
.pm-subtitle {
  font-size: clamp(16px, 4.2vw, 20px);
  line-height: 1.5;
  text-align: center;
  margin: 8px auto 10px;
}
.pm-desc {
  font-size: clamp(15px, 4.2vw, 17px); /* 原本約14px → 放大 */
  line-height: 1.8;
  color: #585858;
  text-align: center;
}

/* Button */
.pm-accordion__btn {
  width: 220px;
  margin: 14px auto 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 16px;
  font-size: 16px;
  font-weight: 700;
  background: #2c295a;
  color: #fff;
  border: 0;
  border-radius: 999px;
  cursor: pointer;
  box-shadow: var(--pm-shadow);
  transition: transform 0.12s var(--pm-ease);
}
.pm-accordion__btn:active {
  transform: scale(0.98);
}
.pm-accordion__icon {
  width: 14px;
  height: 14px;
  position: relative;
  display: inline-block;
}
.pm-accordion__icon::before,
.pm-accordion__icon::after {
  content: "";
  position: absolute;
  inset: 0;
  margin: auto;
  width: 14px;
  height: 2px;
  background: #fff;
  border-radius: 1px;
  transform-origin: center;
}
.pm-accordion__icon::after {
  transform: rotate(90deg);
  transition: transform 0.25s var(--pm-ease);
}
.pm-accordion__btn[aria-expanded="true"] .pm-accordion__icon::after {
  transform: rotate(0deg);
}

/* Panel（下拉內容） */
.pm-accordion__panel {
  overflow: hidden;
  max-height: 0;
  opacity: 0;
  transition: max-height 0.36s var(--pm-ease), opacity 0.25s var(--pm-ease);
  will-change: max-height, opacity;
  background: #fff;
  border-radius: var(--pm-radius);
  box-shadow: var(--pm-shadow);
  margin-top: 12px;
}
.pm-accordion__panel.is-open {
  opacity: 1;
}
.pm-accordion__inner {
  padding: 16px;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--pm-gap);
}
.pm-accordion__media img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 8px;
}
.pm-accordion__text h4 {
  margin: 2px 0 6px;
  font-size: 16px;
}
.pm-accordion__text p,
.pm-accordion__text li {
  font-size: 14px;
  line-height: 1.7;
}

.pm-heading-main {
  display: block;
  font-size: clamp(24px, 6vw, 36px);
  line-height: 1.25;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-align: center;
  color: #000000;
  margin: 0 0 clamp(16px, 4.8vw, 32px); /* 與下方圖片距離 */
}

/* 只給有加 .pm-title--underline 的 h2 用 */
.pm-title--underline {
  position: relative;
  padding-bottom: clamp(14px, 4vw, 24px); /* 原：clamp(8px, 2.4vw, 12px) */
  margin-bottom: clamp(16px, 4vw, 28px); /* 視覺留白同步加一些 */
}

.pm-title--underline::after {
  content: "";
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  bottom: 0;
  width: clamp(80px, 40%, 160px); /* 橫線寬度，依容器縮放 */
  height: 2px; /* 線條粗細 */
  background: #000000; /* 線條顏色（可改） */
  border-radius: 2px;
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.25); /* 視覺微浮起，可移除 */
}

.pm-figure + .pm-title {
  margin-top: clamp(16px, 4.5vw, 32px); /* 手機～桌機自適應 */
}

/* ========== >=768px：平板以上，內容左右排，接近示意圖 ========== */
@media (min-width: 768px) {
  /* 平板以上可稍微加寬（可要可不要） */
  .pm-title--underline::after {
    width: clamp(100px, 28%, 200px);
  }

  /* 平板以上再放大、加大間距 */
  .pm-heading-main {
    font-size: clamp(30px, 4vw, 44px);
    margin-bottom: clamp(20px, 3.2vw, 40px);
  }
  .pm-section {
    padding: 32px 24px 64px;
  }
  .pm-container {
    --pm-maxw: 920px;
  }
  .pm-accordion__inner {
    grid-template-columns: 5fr 7fr;
    align-items: start;
    gap: 20px;
    padding: 20px;
  }
  .pm-title {
    font-size: clamp(24px, 3.2vw, 34px);
  }
  .pm-subtitle {
    font-size: clamp(18px, 2.2vw, 22px);
  }
  .pm-desc {
    font-size: clamp(16px, 2.1vw, 18px);
    line-height: 1.85;
  }
  .pm-accordion__btn {
    font-size: 17px;
  }
}

/* ========== >=1024px：桌機更寬，維持整體比例 ========== */
@media (min-width: 1024px) {
  .pm-container {
    --pm-maxw: 1080px;
  }
  .pm-accordion__inner {
    padding: 24px;
    gap: 24px;
  }

  .pm-desc {
    font-size: clamp(17px, 1.6vw, 19px);
    line-height: 1.9;
    text-align: left;
  }
}