:root {
  --bg: #f3f6fb;
  --panel-bg: rgba(255, 255, 255, 0.00);
  --card-bg: rgba(255, 255, 255, 1.00);
  --footer-bg: repeating-linear-gradient(
    -58deg,
    #ffffff 0 10px,
    #ff7070 10px 13px,
    #ffffff 13px 23px,
    #4ca5ff 23px 26px,
    #ffffff 26px 36px
  );
  --shadow-header: 0 8px 24px rgba(0, 0, 0, 0.22);
  --shadow-card: 0 4px 14px rgba(0, 0, 0, 0.16);
  --card-hover-bg: rgba(207, 237, 255, 0.72);
  --shadow-card-hover: 0 10px 22px rgba(61, 138, 207, 0.28);
  --text: #253041;
  --text-soft: #5f6d80;
  --accent: #2a6ecb;
  --accent-hover: #1f5aaa;
  --border: #d9e2ef;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Yu Gothic UI", "Meiryo", sans-serif;
  color: var(--text);
  background:
    linear-gradient(rgba(243, 246, 251, 0.8), rgba(243, 246, 251, 0.8)),
    url("wallpaper/wallpaper_1.jpg") center / cover fixed no-repeat;
  line-height: 1.5;
  position: relative;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: calc(min(1120px, calc(100% - 32px)) + 56px);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.82), rgba(255, 255, 255, 0.68)),
    linear-gradient(90deg, rgba(76, 165, 255, 0.08) 0%, rgba(255, 255, 255, 0) 16%, rgba(255, 255, 255, 0) 84%, rgba(255, 112, 112, 0.08) 100%);
  -webkit-mask:
    linear-gradient(#000 0 0) center / calc(100% - 20px) 100% no-repeat,
    conic-gradient(from 45deg at 0 50%, #000 90deg, transparent 0) left top / 10px 20px repeat-y,
    conic-gradient(from 225deg at 100% 50%, #000 90deg, transparent 0) right top / 10px 20px repeat-y;
  mask:
    linear-gradient(#000 0 0) center / calc(100% - 20px) 100% no-repeat,
    conic-gradient(from 45deg at 0 50%, #000 90deg, transparent 0) left top / 10px 20px repeat-y,
    conic-gradient(from 225deg at 100% 50%, #000 90deg, transparent 0) right top / 10px 20px repeat-y;
  box-shadow:
    0 0 0 1px rgba(255, 255, 255, 0.42),
    0 22px 52px rgba(47, 73, 105, 0.18),
    inset 0 1px 0 rgba(255, 255, 255, 0.92),
    inset 14px 0 24px rgba(76, 165, 255, 0.06),
    inset -14px 0 24px rgba(255, 112, 112, 0.06);
  pointer-events: none;
  z-index: 0;
}

body > * {
  position: relative;
  z-index: 1;
}

.container {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  width: 100%;
  color: var(--text-soft);
  font-size: 0.95rem;
}

.breadcrumb a {
  color: var(--accent);
  text-decoration: none;
}

.breadcrumb a:hover {
  text-decoration: underline;
}

.breadcrumb-separator {
  color: var(--text-soft);
}

.hero {
  position: relative;
  min-height: 0;
  display: flex;
  align-items: stretch;
  padding-top: 12px;
}

.hero__overlay {
  display: none;
}

.hero__content {
  position: relative;
  z-index: 1;
  color: #fff;
  aspect-ratio: 2276 / 377;
  padding: 16px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: var(--shadow-header);
}

.hero__content::before {
  content: "";
  position: absolute;
  inset: 0;
  background: url("header/header.jpg") center top / 100% 100% no-repeat;
  border-radius: inherit;
  z-index: 0;
}

.main-layout {
  padding: 20px 0 36px;
  display: grid;
  gap: 16px;
}

.subpage-layout {
  padding: 20px 0 36px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.subpage-layout > * {
  width: 100%;
  min-width: 0;
}

#simulator-list {
  grid-template-columns: repeat(2, minmax(220px, 1fr));
}

#article-list {
  grid-template-columns: repeat(2, minmax(220px, 1fr));
}

@media (min-width: 960px) {
  .main-layout {
    grid-template-columns: 2fr 1fr;
    grid-template-areas:
      "sim search"
      "sim notice"
      "article notice"
      "youtube youtube";
    align-items: start;
  }

  #simulator-section {
    grid-area: sim;
  }

  #search-section {
    grid-area: search;
  }

  #notice-section {
    grid-area: notice;
  }

  #article-section {
    grid-area: article;
  }

  #youtube-section {
    grid-area: youtube;
  }
}

@media (max-width: 959px) {
  #simulator-list {
    grid-template-columns: 1fr;
  }

  #article-list {
    grid-template-columns: 1fr;
  }
}

.panel {
  background: var(--panel-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
}

.about-panel {
  display: grid;
  gap: 18px;
}

.about-content {
  display: grid;
  gap: 18px;
}

.about-block {
  display: grid;
  gap: 10px;
}

.about-block h3 {
  margin: 0;
  font-size: 1.05rem;
  color: var(--accent);
}

.about-subheading {
  margin: 4px 0 0;
  font-size: 1rem;
}

.about-block p {
  margin: 0;
}

.about-numbered-list {
  margin: 0;
  padding-left: 1.4rem;
  display: grid;
  gap: 8px;
}

.about-list {
  margin: 0;
  display: grid;
  gap: 12px;
}

.about-item {
  display: grid;
  grid-template-columns: minmax(120px, 180px) 1fr;
  gap: 12px;
  align-items: start;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.72);
}

.about-item dt {
  font-weight: 700;
}

.about-item dd {
  margin: 0;
  word-break: break-all;
}

.panel__header {
  display: flex;
  align-items: center;
  gap: 10px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 10px;
  margin-bottom: 14px;
}

.panel__header h2 {
  margin: 0;
  font-size: 1.2rem;
}

.panel-icon {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  object-fit: cover;
}

.search-row {
  display: flex;
  gap: 8px;
  flex-wrap: nowrap;
  align-items: center;
}

.search-row input[type="search"] {
  min-width: 0;
}

.search-row button {
  flex: 0 0 auto;
  white-space: nowrap;
}

input[type="search"],
input[type="text"] {
  flex: 1;
  min-width: 220px;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
  font: inherit;
}

button {
  border: none;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  padding: 10px 14px;
  font: inherit;
  cursor: pointer;
}

button:hover {
  background: var(--accent-hover);
}

.search-result {
  margin: 8px 0 0;
  color: var(--text-soft);
  font-size: 0.95rem;
}

.search-results-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.search-result-item {
  margin: 0;
}

.search-result-link {
  display: grid;
  gap: 4px;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.72);
  color: inherit;
  text-decoration: none;
  transition: background-color 0.18s ease, box-shadow 0.18s ease, transform 0.18s ease;
}

.search-result-link:hover,
.search-result-link:focus-visible {
  background: var(--card-hover-bg);
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-2px);
}

.search-result-link:focus-visible {
  outline: 2px solid #7dbdf0;
  outline-offset: 2px;
}

.search-result-path {
  color: var(--accent);
  font-weight: 700;
}

.search-result-title {
  font-size: 1rem;
}

.search-result-description,
.search-empty {
  color: var(--text-soft);
  font-size: 0.95rem;
}

.search-empty {
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.72);
}

.notice-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.notice-list--scrollable {
  overflow-y: auto;
  padding-right: 4px;
}

.notice-item {
  display: block;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px;
  background: rgba(255, 255, 255, 0.72);
}

.notice-body {
  display: grid;
  gap: 4px;
}

.notice-text a {
  color: var(--accent);
  font-weight: 700;
  text-decoration: none;
}

.notice-text a:hover {
  text-decoration: underline;
}

.notice-date {
  color: var(--text-soft);
  font-size: 0.9rem;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
}

.card {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px;
  background: var(--card-bg);
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: background-color 0.18s ease, box-shadow 0.18s ease, transform 0.18s ease;
}

.card-title-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.card-feature-icon {
  width: 32px;
  height: 32px;
  object-fit: contain;
  flex: 0 0 auto;
}

.card-link {
  color: inherit;
  text-decoration: none;
  cursor: pointer;
}

.card-link:hover,
.card-link:focus-visible {
  background: var(--card-hover-bg);
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-2px);
}

.card-link:focus-visible {
  outline: 2px solid #7dbdf0;
  outline-offset: 2px;
}

.card h4 {
  margin: 0;
  font-size: 1rem;
}

.card p {
  margin: 0;
  color: var(--text-soft);
  font-size: 0.9rem;
}

.card a {
  color: var(--accent);
  font-weight: 700;
}

.card a {
  text-decoration: none;
}

.card a:hover {
  text-decoration: underline;
}

.video-thumb {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: 6px;
  border: 1px solid var(--border);
}

.video-block + .video-block {
  margin-top: 14px;
}

.video-block h3 {
  margin: 0 0 10px;
  font-size: 1.05rem;
}

.site-footer {
  border-top: 1px solid rgba(255, 255, 255, 0.92);
  background: var(--footer-bg);
  position: relative;
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.76), rgba(255, 255, 255, 0.66));
  pointer-events: none;
}

.footer-inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 12px;
  padding: 14px 0 18px;
  justify-items: center;
  text-align: center;
}

.footer-copy p {
  margin: 0;
  color: #35506c;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: center;
}

.footer-links a {
  color: #35506c;
  text-decoration: none;
}

.footer-links span {
  color: #35506c;
}

.footer-links a:hover {
  color: #ff7070;
}

@media (max-width: 640px) {
  .panel {
    padding: 12px;
  }

  .about-item {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .footer-inner {
    padding: 10px 0 14px;
  }
}