/* =============================================================================
   Base
   ============================================================================= */

body {
  font-family:
    "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", "Hiragino Sans",
    "BIZ UDPGothic", Meiryo, sans-serif;
}

/* =============================================================================
   Header
   ============================================================================= */

#header {
  padding: 1.5rem 0;
  background: url("./img/topimage-d.jpg") no-repeat center top;
  background-size: cover;
}

body.home #header {
  padding: 1.5rem 0;
}

/* --- Page Title --- */

#header h1 {
  margin-top: 1rem;
  margin-bottom: 0;
  font-size: 3rem;
  line-height: 0.7;
  color: white;
}

/* --- Global Navigation --- */

#header #gnav ul.nav {
  margin: 1.5rem 0 0;
}

#header #gnav .nav-item:first-child a {
  border-left: 1px solid white;
}

#header #gnav .nav-item a {
  border-right: 1px solid white;
  color: white;
}

#gnav .nav-link.active {
  font-weight: bold;
  text-decoration: underline;
  text-underline-offset: 4px;
}

/* --- Top Image (home only) --- */

#header #header-topimage {
  display: none;
}

body.home #header #header-topimage {
  display: block;
  margin: 3rem 0 12rem;
}

@media (min-width: 992px) {
  body.home #header #header-topimage {
    margin: 3rem 0 15rem;
  }
}

/* --- Breadcrumb --- */

#breadcrumb {
  margin-top: 0.5rem;
}

body.home #breadcrumb {
  display: none;
}

#breadcrumb .breadcrumb {
  margin: 0;
}

#breadcrumb .breadcrumb-item + .breadcrumb-item::before {
  content: ">";
}

/* =============================================================================
   Main
   ============================================================================= */

#main {
  min-height: 300px;
}

/* --- Section Spacing --- */

#main > section {
  padding: 4rem 0;
}

#main > section:first-of-type {
  padding-top: 3rem;
}

#main > section:nth-child(even) {
  background-color: #eaeaea;
}

body.home #main > section {
  padding-top: 4rem;
}

/* --- Headings --- */

#main h2 {
  margin-top: 4rem;
  margin-bottom: 2rem;
  padding-left: 1rem;
  border-left: 10px solid #008bac;
  font-size: 2rem;
}

#main h2:first-child {
  margin-top: 0;
}

#main h3 {
  margin-top: 3rem;
  margin-bottom: 1.5rem;
  padding-left: 0.75rem;
  border-left: 4px solid #55a0d0;
  font-size: 1.5rem;
}

#main h2 + h3 {
  margin-top: 0;
}

#main h4 {
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  padding-left: 0.75rem;
  border-left: 3px solid #ccc;
  font-size: 1.1rem;
  color: #555;
}

#main h3 + h4,
#main h2 + h4 {
  margin-top: 0;
}

/* --- Buttons --- */

#main .btn {
  margin-bottom: 0.5rem;
}

#main .btn-lg {
  padding: 1rem 0;
}

#main .btn-recruit {
  background-color: #55a0d0;
  color: white;
}

/* --- News --- */

#main dl.news {
  height: 20rem;
  overflow-y: scroll;
}

#main dt {
  margin-bottom: 0;
}

#main dd {
  margin-bottom: 0.5rem;
}

/* --- Iframe --- */

#main .iframe {
  position: relative;
  width: 100%;
  height: 0;
  padding-bottom: 50%;
}

#main .iframe iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

/* --- Research Images --- */

#main .research-img {
  width: 100%;
  height: auto;
  object-fit: contain;
}

@media (min-width: 992px) {
  #main .research-img {
    width: auto;
    max-width: 100%;
    height: 200px;
  }
}

/* --- Lightbox --- */

#main a[data-lightbox] {
  position: relative;
  display: inline-block;
}

#main a[data-lightbox]::after {
  content: "\F52A";
  position: absolute;
  right: 6px;
  bottom: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.5);
  font-family: "bootstrap-icons";
  font-size: 1.2rem;
  color: white;
  opacity: 0.6;
}

#main a[data-lightbox]:hover::after {
  opacity: 1;
}

#main .img-badge {
  position: absolute;
  left: 6px;
  bottom: 6px;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  background: rgba(0, 0, 0, 0.5);
  font-size: 0.8rem;
  color: white;
}

.lb-image {
  min-width: min(80vw, 600px);
  min-height: min(80vh, 600px);
  object-fit: contain;
}

/* --- Staff (Member page) --- */

#main .staff {
  margin-bottom: 1rem;
  border-bottom: 1px solid #000;
}

#main .staff:first-of-type {
  padding-top: 1rem;
  border-top: 1px solid #000;
}

#main .staff .staff-name {
  margin-bottom: 0.5rem;
  font-size: 1.2rem;
  font-weight: bold;
}

#main .staff .staff-link {
  margin-bottom: 1rem;
}

#main .staff .staff-link a.btn {
  margin-right: 0.5rem;
}

/* --- Equipment (Equipment page) --- */

#main .accordion-button {
  font-size: 1.5rem;
  font-weight: bolder;
}

#main .equipment:not(:has(.equipment-img))::before {
  content: "";
  display: block;
  margin-bottom: 0.5rem;
  aspect-ratio: 1 / 1;
  background-color: #e0e0e0;
}

#main .equipment-title {
  font-weight: bold;
}

#main .equipment-description {
  margin-bottom: 0;
}

#main .equipment-description:last-of-type {
  margin-bottom: 1rem;
}

#main .equipment-img {
  max-width: 83.333%;
  margin-inline: auto;
}

@media (min-width: 576px) {
  #main .equipment-img {
    max-width: 66.666%;
  }
}

@media (min-width: 992px) {
  #main .equipment-img {
    max-width: 100%;
  }
}

#main .equipment-img a[data-lightbox] {
  display: block;
  overflow: hidden;
  aspect-ratio: 1 / 1;
}

#main .equipment-img a[data-lightbox] img {
  width: 100%;
  max-width: none;
  height: 100%;
  object-fit: cover;
}

/* =============================================================================
   Footer
   ============================================================================= */

#footer {
  padding: 2rem 0;
  background-color: #a8a8a8;
  color: white;
}

#footer h2 {
  margin-bottom: 2rem;
  font-size: 2rem;
}

#footer a {
  color: #ffffff;
}

/* =============================================================================
   Mobile Navigation
   ============================================================================= */

#mnav {
  display: none;
  position: fixed;
  top: 0;
  width: 100%;
  height: 100%;
  overflow-y: auto;
  background-color: #008bac;
  font-size: 2rem;
  color: white;
  z-index: 9999;
}

#mnav .nav {
  flex-direction: column;
  align-items: center;
}

#mnav li {
  margin: 0.5rem 1rem;
  list-style-type: none;
  text-align: center;
}

#mnav a {
  color: white;
  text-decoration: none;
}

#mnav i {
  margin-right: 1rem;
  font-size: 4rem;
}

/* =============================================================================
   Utilities
   ============================================================================= */

#pagetop {
  position: fixed;
  right: 1.5rem;
  bottom: 1.5rem;
  font-size: 2.5rem;
  color: #008bac;
  text-decoration: none;
  opacity: 0.7;
  z-index: 999;
}

#pagetop:hover {
  opacity: 1;
}