/* ===== 卒業研究ページ ===== */
.fixed-top-menu {
  position: sticky;
  top: 0;
  z-index: 1000;
}

.research-page {
  width: 100%;
  padding: 32px 0 64px;
  background-color: #f5f6f7;
}

.research-title-area {
  margin-bottom: 18px;
  text-align: center;
}

.research-title-en {
  margin-bottom: 8px;
  font-size: clamp(1.45rem, 3vw, 2rem);
  font-weight: 900;
  line-height: 1;
}

.research-title-logo {
  width: min(74%, 520px);
  margin: 0 auto;
}

.research-lead {
  margin: 0 auto 34px;
  font-size: clamp(1.25rem, 2.5vw, 1.65rem);
  font-weight: 700;
  line-height: 1.35;
  text-align: center;
  letter-spacing: -0.03em;
}

.research-year-block {
  width: min(100%, 640px);
  margin: 0 auto 42px;
}

.research-year-label {
  display: inline-grid;
  place-items: center;
  min-width: 200px;
  min-height: 42px;
  margin-bottom: 18px;
  padding: 0 38px;
  transform: skew(-12deg);
  background: linear-gradient(135deg, #fff574 0%, #ffe600 42%, #f4c900 100%);
  border: 4px solid #111111;
  box-shadow: 4px 5px 0 #111111, 12px 12px 0 rgba(0, 0, 0, 0.22);
  color: #111111;
  font-size: clamp(1.65rem, 4vw, 2.35rem);
  font-weight: 900;
  line-height: 1;
  text-shadow: 2px 2px 0 rgba(0, 0, 0, 0.42);
}

.research-year-label::first-line {
  transform: skew(12deg);
}

.research-category {
  margin-bottom: 28px;
}

.research-category h2 {
  margin: 0 0 8px;
  font-size: clamp(1.65rem, 3vw, 2.25rem);
  font-weight: 900;
  line-height: 1.2;
  text-shadow: 3px 4px 0 rgba(0, 0, 0, 0.2);
}

.research-list {
  margin: 0;
  padding-left: 28px;
  list-style: none;
  font-size: clamp(1.15rem, 2.4vw, 1.55rem);
  font-weight: 700;
  line-height: 1.65;
  letter-spacing: -0.02em;
}

.research-list li {
  position: relative;
  margin-bottom: 8px;
}

.research-list li::before {
  content: "・";
  position: absolute;
  left: -26px;
  color: #f2d900;
  font-weight: 900;
}

.research-archive-link-area {
  width: min(100%, 640px);
  margin: 54px auto 0;
  text-align: center;
}

.research-archive-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  color: #111111;
  font-size: clamp(1.65rem, 3vw, 2.15rem);
  font-weight: 900;
  line-height: 1.15;
  text-shadow: 3px 4px 0 rgba(0, 0, 0, 0.2);
}

.research-archive-link::after {
  content: "";
  position: absolute;
  left: 58px;
  right: 0;
  bottom: -8px;
  height: 6px;
  background-color: #fff000;
  box-shadow: 3px 4px 0 rgba(0, 0, 0, 0.18);
}

.research-archive-badge {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: #fff000;
  color: #111111;
  font-size: 2rem;
  font-weight: 900;
  text-align: center;
  line-height: 1;
  box-shadow: 4px 5px 0 rgba(0, 0, 0, 0.2);
  text-shadow: 2px 2px 0 rgba(0, 0, 0, 0.18);
}

.research-archive-text {
  position: relative;
  z-index: 1;
}

@media (max-width: 640px) {
  .research-page {
    padding: 20px 0 44px;
  }

  .research-frame {
    width: min(100% - 28px, 520px);
    padding: 28px 18px 44px;
  }

  .research-title-logo {
    width: min(86%, 420px);
  }

  .research-lead {
    margin-bottom: 30px;
    font-size: 1rem;
    line-height: 1.45;
  }

  .research-year-block {
    width: 100%;
    margin-bottom: 38px;
  }

  .research-year-label {
    min-width: 190px;
    min-height: 56px;
    padding: 0 28px;
    font-size: 1.55rem;
  }

  .research-category h2 {
    font-size: 1.65rem;
  }

  .research-list {
    padding-left: 24px;
    font-size: 1rem;
    line-height: 1.65;
  }

  .research-list li::before {
    left: -22px;
  }

  .research-archive-link-area {
    margin-top: 42px;
  }

  .research-archive-link {
    font-size: 1.25rem;
  }

  .research-archive-badge {
    width: 30px;
    height: 30px;
    font-size: 1.55rem;
  }

  .research-archive-link::after {
    left: 46px;
    height: 4px;
  }
}