* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --page-bg: #f4ffbe;
  --panel-bg: #f6f2e8;
  --panel-bg-soft: #edf4e7;
  --line: #95ad89;
  --line-soft: #bfd0b6;
  --text: #273528;
  --text-soft: #53634f;
  --text-muted: #73806f;
  --accent: #6f8f5f;
  --accent-soft: #4f7044;
  --accent-quiet: rgba(111, 143, 95, 0.16);
  --rose: #b87362;
}

body {
  font-family: 'Segoe UI', sans-serif;
  background: var(--page-bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.language-select {
  position: absolute;
  top: 10px;
  right: 10px;
  z-index: 1000;
  width: 50px;
}

.language-select-toggle,
.language-select-option {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 50px;
  height: 32px;
  padding: 5px 15px 5px 5px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: var(--panel-bg);
  cursor: pointer;
}

.language-select-toggle {
  position: relative;
}

.language-select-toggle::after {
  content: '';
  position: absolute;
  top: 50%;
  right: 5px;
  width: 6px;
  height: 6px;
  border-right: 1.5px solid var(--text-soft);
  border-bottom: 1.5px solid var(--text-soft);
  transform: translateY(-65%) rotate(45deg);
}

.language-select svg {
  display: block;
  width: 24px;
  height: 16px;
  flex: 0 0 auto;
  overflow: hidden;
  border-radius: 2px;
  box-shadow: 0 0 0 1px rgba(39, 53, 40, 0.18);
}

.language-select-menu {
  position: absolute;
  top: calc(100% + 4px);
  right: 0;
  display: none;
  gap: 3px;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--panel-bg);
  box-shadow: 0 8px 20px rgba(39, 53, 40, 0.2);
}

.language-select.is-open .language-select-menu {
  display: grid;
}

.language-select-option {
  width: 40px;
  height: 27px;
  padding: 4px 8px;
  border-color: transparent;
}

.language-select-option:hover,
.language-select-option[aria-selected='true'] {
  border-color: var(--line);
  background: var(--panel-bg-soft);
}

.language-select-toggle:focus-visible,
.language-select-option:focus-visible {
  outline: 3px solid var(--accent-quiet);
  outline-offset: 2px;
}

header {
  background: var(--panel-bg);
  width: fit-content;
  margin: 32px auto 0;
  transform: translateY(0px);
  padding: 8px 24px;
  text-align: center;
  border: 2px solid var(--line);
  border-radius: 12px;
}

header h1 {
  display: flex;
  align-items: center;
  gap: 0.2em;
  font-family: 'Gaegu', cursive;
  font-size: 2.5rem;
  line-height: 1.1;
  color: #000;
}

header .site-logo {
  width: 1em;
  height: 1em;
  object-fit: contain;
}

header p {
  color: var(--text-soft);
  font-size: 1rem;
}

main {
  flex: 1;
  padding: 40px 20px;
  max-width: 1000px;
  width: 100%;
  margin: 0 auto;
}

.project-grid {
  --project-grid-gap: clamp(4px, 2vw, 20px);
  --project-grid-four-card-gaps: clamp(12px, 6vw, 60px);
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--project-grid-gap);
}

@media (max-width: 600px) and (orientation: portrait) {
  .project-grid {
    width: min(100%, 470px);
    margin-inline: auto;
    flex-wrap: nowrap;
  }

  .project-grid > .project-card {
    flex: 1 1 0;
  }
}

.site-introduction {
  width: min(100%, 470px);
  margin: 24px auto 0;
  padding: 18px 22px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--panel-bg);
  color: var(--text);
  font-size: 1rem;
  line-height: 1.7;
}

.site-introduction p + p {
  margin-top: 12px;
}

.site-introduction-link,
.site-introduction-link:visited {
  color: inherit;
  font-style: italic;
  text-decoration: underline;
  text-decoration-color: #000;
  text-underline-offset: 2px;
}

.main-video-panel {
  width: min(100%, 780px);
  margin: 24px auto 0;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--panel-bg);
  box-shadow: 0 14px 36px rgba(39, 53, 40, 0.16);
}

.main-video-panel-title {
  margin: 0 0 12px;
  color: var(--text);
  font-size: 1.5rem;
  font-weight: 900;
  text-align: center;
}

.developer-games-title {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.15em;
}

.developer-games-title-icon {
  display: block;
  width: 1.44em;
  height: 1.44em;
  flex: 0 0 auto;
  object-fit: contain;
}

.main-video-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}

.main-video-card {
  display: block;
  width: min(100%, 360px);
  overflow: hidden;
  border: 2px solid var(--line-soft);
  border-radius: 12px;
  background: var(--panel-bg);
  color: inherit;
  text-decoration: none;
  box-shadow: 0 8px 22px rgba(39, 53, 40, 0.15);
  transition: border-color 0.15s, transform 0.15s, box-shadow 0.15s;
}

.main-video-card[hidden] {
  display: none;
}

.main-video-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(39, 53, 40, 0.22);
}

.main-video-card:focus-visible {
  outline: 3px solid var(--accent-quiet);
  outline-offset: 3px;
}

.main-video-card-title {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 6px;
  padding: 8px 10px;
  color: var(--text);
  font-size: 1.32rem;
  font-weight: 800;
  text-align: center;
}

.main-video-shortcut {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.72em;
  font-weight: 900;
  line-height: 1;
  white-space: nowrap;
}

.main-video-shortcut-icon {
  display: block;
  width: 1.15em;
  height: 1.15em;
  flex: 0 0 auto;
}

.main-video-media {
  display: block;
  width: 100%;
  height: auto;
  background: #151a16;
  pointer-events: none;
}

.developer-social-card {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  width: fit-content;
  margin: 14px auto 0;
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--panel-bg);
  box-shadow: 0 8px 20px rgba(39, 53, 40, 0.12);
}

.developer-social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  padding: 4px;
  border: 1px solid var(--line-soft);
  border-radius: 9px;
  background: #fff;
  transition: border-color 0.15s, background 0.15s, transform 0.15s;
}

.developer-social-link:hover {
  border-color: var(--line);
  background: var(--panel-bg-soft);
  transform: translateY(-2px);
}

.developer-social-link:focus-visible {
  outline: 3px solid var(--accent-quiet);
  outline-offset: 2px;
}

.developer-social-link img {
  display: block;
  width: 42px;
  height: 42px;
  object-fit: contain;
}

.support-button {
  display: flex;
  justify-content: center;
  margin-top: 24px;
}

.project-card {
  flex: 0 1 min(225px, calc((100% - var(--project-grid-four-card-gaps)) / 4));
  min-width: 0;
  background: var(--panel-bg);
  border: 1px solid var(--line-soft);
  border-radius: 12px;
  padding: clamp(6px, 2.4vw, 24px) clamp(4px, 2vw, 20px);
  text-align: center;
  text-decoration: none;
  color: inherit;
  transition: border-color 0.2s, transform 0.2s, background 0.2s;
}

.project-card:hover {
  background: var(--panel-bg-soft);
  border-color: var(--accent);
  transform: translateY(-4px);
}

.project-thumb {
  display: block;
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border: 2px solid var(--line);
  border-radius: 8px;
  margin-bottom: 12px;
}

.project-card h3 {
  overflow-wrap: anywhere;
  font-size: clamp(0.62rem, 2.7vw, 1.1rem);
  margin-bottom: clamp(2px, 0.6vw, 6px);
  color: var(--text);
}

.project-card h3::after {
  content: ' \2192';
  color: #2563eb;
}

.project-card p {
  overflow-wrap: anywhere;
  font-size: clamp(0.55rem, 2.1vw, 0.85rem);
  color: var(--text-muted);
}

footer {
  text-align: center;
  padding: 20px;
  color: var(--text-muted);
  font-size: 0.85rem;
  border-top: 1px solid var(--line-soft);
}

/* Game page common */
.back-link {
  display: inline-block;
  margin: 20px;
  color: var(--accent-soft);
  text-decoration: none;
  font-size: 0.9rem;
}

.back-link:hover {
  color: var(--accent);
  text-decoration: underline;
}

.page-header {
  background: var(--panel-bg);
  padding: 30px 20px;
  text-align: center;
  border-bottom: 2px solid var(--accent);
}

.page-header h1 {
  font-size: 2rem;
  color: var(--accent-soft);
}

.page-container {
  max-width: 900px;
  margin: 40px auto;
  padding: 0 20px;
}

.export-result-overlay {
  position: fixed;
  inset: 0;
  z-index: 10050;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  background: rgba(24, 32, 25, 0.72);
  backdrop-filter: blur(5px);
}

.export-result-panel {
  position: relative;
  width: min(100%, 480px);
  max-height: calc(100vh - 32px);
  max-height: calc(100dvh - 32px);
  overflow-y: auto;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--panel-bg);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.35);
}

.export-result-title {
  margin: 0 36px 12px;
  color: var(--text);
  font-size: 1.35rem;
  text-align: center;
}

.export-result-close {
  position: absolute;
  top: 10px;
  right: 10px;
  width: 36px;
  height: 36px;
  padding: 0;
  border: 1px solid var(--line-soft);
  border-radius: 50%;
  background: #fffaf3;
  color: var(--text-soft);
  font-size: 1.55rem;
  line-height: 1;
  cursor: pointer;
}

.export-result-preview {
  display: block;
  width: 100%;
  max-height: 52vh;
  max-height: 52dvh;
  border-radius: 10px;
  background: #151a16;
  object-fit: contain;
}

.export-result-actions {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  margin-top: 12px;
}

.export-result-button {
  min-height: 46px;
  padding: 9px 10px;
  border: 2px solid var(--line-soft);
  border-radius: 10px;
  background: #fffaf3;
  color: var(--text);
  font-size: 0.9rem;
  font-weight: 800;
  line-height: 1.15;
  cursor: pointer;
}

.export-result-save {
  border-color: var(--accent);
  background: var(--accent);
  color: #fff;
}

.export-result-combined {
  grid-column: 1 / -1;
}

.export-result-button:focus-visible,
.export-result-close:focus-visible {
  outline: 3px solid rgba(37, 99, 235, 0.45);
  outline-offset: 2px;
}