:root {
  --font-en: "Outfit", sans-serif;
  --blue: #0D47BC;
  --green: #009A48;
  --red: #CD2900;
  --orange: #E8A200;
  --purple: #7400C4;
  --black: #000000;
}

/* ================================
   Common (base / utilities)
================================ */
.hidden {
  display: none !important;
}

/* select の矢印は共通で定義 */
.select-wrap {
  position: relative;
}
.select-wrap::after {
  content: "";
  position: absolute;
  right: 19px;
  top: 50%;
  width: 12px;
  height: 8px;
  transform: translateY(-50%) rotate(0deg); /* 閉＝下向き */
  transition: transform 0.2s ease;
  background-repeat: no-repeat;
  background-size: 12px 8px;
  pointer-events: none;
  background-image: url('data:image/svg+xml;utf8,<svg width="12" height="8" viewBox="0 0 12 8" fill="none" xmlns="http://www.w3.org/2000/svg"><path d="M11 1.5L6 6.5L1 1.5" stroke="black" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/></svg>');
}
.select-wrap.is-open::after {
  transform: translateY(-50%) rotate(180deg);
}

/* select 本体の共通体裁（サイズはブレイクポイントで上書き） */
#categoryFilter {
  padding: 8px 40px 8px 20px;
  border: 1px solid #ccc;
  border-radius: 8px;
  background: #fff;
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
}
#categoryFilter:focus-visible {
  outline: 0;
}

/* ================================
   Desktop ≥ 769px
================================ */
@media screen and (min-width: 769px) {
  .content {
    max-width: 1024px;
    margin-left: auto;
    margin-right: auto;
    padding-left: 30px;
    padding-right: 30px;
  }

  .top-area {
    padding: 146px 0;
    background: linear-gradient(
      120deg,
      rgb(107, 227, 255) 0%,
      rgb(0, 135, 255) 39%,
      rgb(160, 80, 255) 100%
    );
  }
  .top-area__wrapper {
    max-width: 1024px;
    margin-left: auto;
    margin-right: auto;
  }
  .top-area__ttl {
    font-size: 32px;
    font-weight: 600;
    letter-spacing: 0.04em;
    color: #fff;
  }
  .top-area__note {
    line-height: 2;
  }

  .contents {
    max-width: 1064px;
    margin-left: auto;
    margin-right: auto;
    padding: 120px 0;
  }
  .contents__text {
    font-size: 18px;
    line-height: 2;
    letter-spacing: 0.04em;
  }
  .contents__list {
    margin-top: 80px;
  }

  /* grid */
  .cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 63px 56px;
  }

  /* card */
  .card {
    position: relative;
    transition: all 0.3s ease;
  }
  .card--limited {
    position: relative;
  }
  .card--limited::after {
    content: "";
    position: absolute;
    inset: 0;
    z-index: -1;
    opacity: 0.1;
    background: linear-gradient(135deg, #6BE3FF 0%, #0093E9 47.92%, #8863FF 100%);
  }

  .card__link {
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 20px 20px 30px;
    /* min-height: 438px; */
  }
  .card__link .new {
    position: absolute;
    top: 0;
    left: 0;
    z-index: 2;
    display: inline-block;
    padding: 8px 17px 8px 16px;
    border-top-left-radius: 10px;
    border-bottom-right-radius: 10px;
    background: #E7380D;
    color: #fff;
    font-size: 16px;
    font-weight: 700;
    letter-spacing: 0;
  }

  .term {
    margin-top: 13px;
    color: #007AE5;
    font-size: 14px;
    font-weight: 700;
    letter-spacing: 0.04em;
  }

  .card__ttl {
    margin-top: 13px;
    font-size: 16px;
    font-weight: 600;
    line-height: 1.75;
    letter-spacing: 0.08em;
  }

  .card__btn {
    position: relative;
    display: block;
    width: 140px;
    padding: 11px 0 11px 20px;
    border: 1px solid #000;
    border-radius: 10px;
    background: #fff;
    color: #000;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.08em;
    transition: all 0.3s ease;
  }
  .card__btn::after {
    content: "";
    position: absolute;
    top: 50%;
    right: 16px;
    width: 12px;
    height: 12px;
    transform: translateY(-50%);
    mask-image: url(/mastrum/assets/images/download/download_icon.svg);
    -webkit-mask-image: url(/mastrum/assets/images/download/download_icon.svg);
    mask-repeat: no-repeat;
    background-color: #000;
    transition: all 0.3s ease;
  }

  .card .ico--limited {
    position: absolute;
    right: 20px;
    bottom: 20px;
    display: inline-block;
    width: 91px;
    padding: 11px 0;
    border-radius: 10px;
    text-align: center;
    background: linear-gradient(135deg, #6BE3FF 0%, #0093E9 47.92%, #8863FF 100%);
    color: #fff;
    font-size: 12px;
    font-weight: 700;
  }

  /* blog/filter (PC) */
  .blog-container {
    margin: 0 auto;
    padding: 0 20px;
  }
  .filter {
    display: flex;
    gap: 24px;
    margin-bottom: 88px;
  }
  #categoryFilter {
    width: 320px;
    height: 56px;
  }
  #filterBtn {
    padding: 8px 22px;
    border: 0;
    border-radius: 30px;
    background: linear-gradient(135deg, #6BE3FF 0%, #0087FF 40%, #A050FF 100%);
    color: #fff;
    cursor: pointer;
    letter-spacing: 0.18em;
    font-weight: 500;
  }

  /* card parts (PC) */
  .card .tag-new {
    position: absolute;
    top: 0;
    left: 0;
    z-index: 1;
    padding: 6px 17px 9px;
    border-bottom-right-radius: 8px;
    background: #CD2900;
    color: #fff;
    font-family: var(--font-en);
    font-size: 16px;
    letter-spacing: 0.04em;
  }
  .card .thumb {
    position: relative;
    width: 100%;
    margin-bottom: 18px;
    padding-bottom: 56.25%; /* 16:9 */
    background: #ccc;
    border-radius: 8px;
    overflow: hidden;
  }
  .card .thumb img {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
  }
  .card .tag-cat {
    display: inline-block;
    margin-bottom: 8px;
    padding: 9px 10px;
    border-radius: 2px;
    background: #F0F2F9;
    color: #007AE5;
    font-size: 14px;
    letter-spacing: 0.02em;
  }
  .card h3 {
    margin: 5px 0 16px;
    font-size: 16px;
    line-height: 2;
  }
  .card .info {
    display: flex;
    align-items: center;
    justify-content: space-between;
  }
  .card time {
    color: #969696;
    font-family: var(--font-en);
    font-size: 16px;
    letter-spacing: 0.04em;
  }
  .card .more-link {
    position: relative;
    padding-right: 22px;
    color: #007AE5;
    font-family: var(--font-en);
    font-size: 18px;
    font-weight: 600;
    letter-spacing: 0.04em;
  }
  .card .more-link::after {
    content: "";
    position: absolute;
    right: 0;
    top: 9px;
    width: 12px;
    height: 8px;
    transform: translateY(-50%) rotate(270deg);
    background-repeat: no-repeat;
    background-size: 12px 8px;
    pointer-events: none;
    background-image: url('data:image/svg+xml;utf8,<svg width="12" height="8" viewBox="0 0 12 8" fill="none" xmlns="http://www.w3.org/2000/svg"><path d="M11 1.5L6 6.5L1 1.5" stroke="%23007AE5" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/></svg>');
  }

  /* Load more (PC) */
  #loadMoreBtn {
    position: relative;
    display: block;
    margin: 118px auto 0;
    padding: 18px 88px;
    border: 0;
    border-radius: 50px;
    background: #007AE5;
    color: #fff;
    cursor: pointer;
    font-family: var(--font-en);
    font-size: 20px;
    letter-spacing: 0.1em;
  }
  #loadMoreBtn::after {
    content: "";
    position: absolute;
    right: 20px;
    top: 50%;
    width: 14px;
    height: 10px;
    transform: translateY(-50%) rotate(0deg);
    transition: transform 0.2s ease;
    background-repeat: no-repeat;
    background-size: 14px 10px;
    pointer-events: none;
    background-image: url('data:image/svg+xml;utf8,<svg width="12" height="8" viewBox="0 0 12 8" fill="none" xmlns="http://www.w3.org/2000/svg"><path d="M11 1.5L6 6.5L1 1.5" stroke="%23ffffff" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/></svg>');
  }

  /* breadcrumbs (PC) */
  .breadcrumbs {
    padding: 13px 0;
    background: linear-gradient(135deg, #6BE3FF 0%, #0093E9 47.92%, #8863FF 100%);
  }
  .breadcrumbs__list {
    display: flex;
    align-items: center;
    max-width: 1084px;
    margin-left: auto;
    margin-right: auto;
    padding-left: 30px;
    padding-right: 30px;
  }
  .breadcrumbs__list li {
    position: relative;
    padding: 0 10px;
    color: #fff;
    font-size: 12px;
    font-weight: 500;
  }
  .breadcrumbs__list li:not(:first-of-type) {
    margin-left: 30px;
  }
  .breadcrumbs__list li:not(:first-of-type)::after {
    content: "";
    position: absolute;
    top: 50%;
    left: -22px;
    width: 7px;
    height: 7px;
    transform: translateY(-50%) rotate(45deg);
    border-top: 1px solid #fff;
    border-right: 1px solid #fff;
  }
}

/* ================================
   Tablet ≤ 920px
   （カードの列数調整）
================================ */
@media (max-width: 920px) {
  .contents__list.cards {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ================================
   Mobile ≤ 768px
================================ */
@media screen and (max-width: 768px) {
  .content {
    padding-left: 5.07vw;
    padding-right: 5.07vw;
  }

  .top-area {
    padding: 22.13vw 0 21.6vw;
    background: linear-gradient(95deg, #6BE3FF 0%, #0093E9 47.92%, #8863FF 100%);
  }
  .top-area__wrapper {
    padding-left: 6.4vw;
    padding-right: 6.4vw;
  }
  .top-area__ttl {
    text-align: center;
    color: #fff;
    font-size: 5.87vw;
    font-weight: 600;
    letter-spacing: 0.04em;
  }
  .top-area__note {
    line-height: 2;
  }

  .contents {
    padding: 18.5vw 6.4vw 26.67vw;
  }
  .contents__text {
    font-size: 4.27vw;
    line-height: 2.125;
    letter-spacing: 0.04em;
  }

  /* grid */
  .cards {
    display: grid;
    gap: 16vw;
  }

  /* card */
  .card {
    position: relative;
    transition: all 0.3s ease;
  }
  .card--limited {
    position: relative;
  }
  .card--limited::after {
    content: "";
    position: absolute;
    inset: 0;
    z-index: -1;
    opacity: 0.1;
    background: linear-gradient(135deg, #6BE3FF 0%, #0093E9 47.92%, #8863FF 100%);
  }

  .card__link {
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 5.33vw;
    /* min-height: 105.33vw; */
  }
  .card__link .new {
    position: absolute;
    top: 0;
    left: 0;
    z-index: 2;
    display: inline-block;
    padding: 2.134vw 4.53vw;
    border-top-left-radius: 10px;
    border-bottom-right-radius: 10px;
    background: #E7380D;
    color: #fff;
    font-size: 4.267vw;
    font-weight: 700;
    letter-spacing: 0;
  }

  .term {
    margin-top: 3.467vw;
    color: #007AE5;
    font-size: 3.73vw;
    font-weight: 700;
    letter-spacing: 0.04em;
  }

  .card__ttl {
    margin-top: 2.87vw;
    font-size: 4.27vw;
    font-weight: 600;
    line-height: 1.75;
    letter-spacing: 0.08em;
  }

  .card__btn {
    position: relative;
    display: block;
    width: 37.07vw;
    margin-top: 7vw;
    padding: 2.93vw 0 2.93vw 5.33vw;
    border: 1px solid #000;
    border-radius: 10px;
    background: #fff;
    color: #000;
    font-size: 3.2vw;
    font-weight: 600;
    letter-spacing: 0.08em;
  }
  .card__btn::after {
    content: "";
    position: absolute;
    top: 50%;
    right: 4.33vw;
    width: 3.2vw;
    height: 3.2vw;
    transform: translateY(-50%);
    mask-image: url(/mastrum/assets/images/download/download_icon.svg);
    -webkit-mask-image: url(/mastrum/assets/images/download/download_icon.svg);
    mask-repeat: no-repeat;
    background-repeat: no-repeat;
    background-size: contain;
    background-color: #000;
  }

  .card .ico--limited {
    position: absolute;
    right: 5.33vw;
    bottom: 5.33vw;
    display: inline-block;
    width: 24vw;
    padding: 2.93vw 0;
    border-radius: 10px;
    text-align: center;
    background: linear-gradient(135deg, #6BE3FF 0%, #0093E9 47.92%, #8863FF 100%);
    color: #fff;
    font-size: 3.2vw;
    font-weight: 700;
  }

  /* blog/filter (SP) */
  .blog-container {
    margin: 0 auto;
  }
  .filter {
    margin-bottom: 18.5vw;
  }
  #categoryFilter {
    width: 100%;
    height: 14vw;
  }
  #filterBtn {
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 5vw auto;
    padding: 5vw 21vw;
    border: 0;
    border-radius: 50px;
    background: linear-gradient(135deg, #6BE3FF 0%, #0087FF 40%, #A050FF 100%);
    color: #fff;
    cursor: pointer;
    letter-spacing: 0.18em;
    font-weight: 500;
    font-size: 4vw;
  }

  /* card parts (SP) */
  .card .tag-new {
    position: absolute;
    top: 0;
    left: 0;
    z-index: 1;
    padding: 2vw 4.4vw;
    border-bottom-right-radius: 8px;
    background: #CD2900;
    color: #fff;
    font-family: var(--font-en);
    font-size: 4vw;
    letter-spacing: 0.04em;
  }
  .card .thumb {
    position: relative;
    width: 100%;
    margin-bottom: 5vw;
    padding-bottom: 56.25%; /* 16:9 */
    background: #ccc;
    border-radius: 8px;
    overflow: hidden;
  }
  .card .thumb img {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
  }
  .card .tag-cat {
    display: inline-block;
    margin-bottom: 8px;
    padding: 2vw 2vw;
    border-radius: 6px;
    background: #F0F2F9;
    color: #007AE5;
    font-size: 3.5vw;
    letter-spacing: 0.02em;
  }
  .card h3 {
    margin: 1.8vw 0 3.6vw;
    font-size: 4.2vw;
    line-height: 2;
  }
  .card .info {
    display: flex;
    align-items: center;
    justify-content: space-between;
  }
  .card time {
    color: #969696;
    font-family: var(--font-en);
    font-size: 4vw;
    letter-spacing: 0.04em;
  }
  .card .more-link {
    position: relative;
    padding-right: 6vw;
    color: #007AE5;
    font-family: var(--font-en);
    font-size: 4.6vw;
    font-weight: 600;
    letter-spacing: 0.04em;
  }
  .card .more-link::after {
    content: "";
    position: absolute;
    right: 0;
    top: 46%;
    width: 12px;
    height: 8px;
    transform: translateY(-50%) rotate(270deg);
    background-repeat: no-repeat;
    background-size: 12px 8px;
    pointer-events: none;
    background-image: url('data:image/svg+xml;utf8,<svg width="12" height="8" viewBox="0 0 12 8" fill="none" xmlns="http://www.w3.org/2000/svg"><path d="M11 1.5L6 6.5L1 1.5" stroke="%23007AE5" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/></svg>');
  }

  /* Load more (SP) */
  #loadMoreBtn {
    position: relative;
    display: block;
    margin: 26vw auto 0;
    padding: 4.6vw 22.5vw;
    border: 0;
    border-radius: 50px;
    background: #007AE5;
    color: #fff;
    cursor: pointer;
    font-family: var(--font-en);
    font-size: 5.1vw;
    letter-spacing: 0.1em;
  }
  #loadMoreBtn::after {
    content: "";
    position: absolute;
    right: 20px;
    top: 50%;
    width: 14px;
    height: 10px;
    transform: translateY(-50%) rotate(0deg);
    transition: transform 0.2s ease;
    background-repeat: no-repeat;
    background-size: 14px 10px;
    pointer-events: none;
    background-image: url('data:image/svg+xml;utf8,<svg width="12" height="8" viewBox="0 0 12 8" fill="none" xmlns="http://www.w3.org/2000/svg"><path d="M11 1.5L6 6.5L1 1.5" stroke="%23ffffff" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/></svg>');
  }
}

/* ================================
   Phone ≤ 560px
   （カードの列数 1 列）
================================ */
@media (max-width: 560px) {
  .contents__list.cards {
    grid-template-columns: 1fr;
  }
}