:root {
  --bg: #f9f9f7;
  --paper: #ffffff;
  --ink: #171717;
  --muted: #5d5d5d;
  --line: #d7d7d2;
  --line-dark: #bdbdb4;
  --accent: #111111;
  --radius: 14px;
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: "Noto Sans SC", "Work Sans", sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.5;
}

.home-body {
  min-height: 100vh;
}

.is-lightbox-open {
  overflow: hidden;
}

.site-shell {
  width: min(1120px, 94vw);
  margin: 0 auto;
  padding: 28px 0 56px;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 14px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
}

.brand-box {
  display: flex;
  align-items: center;
  gap: 14px;
}

.app-icon {
  width: 64px;
  height: 64px;
  object-fit: cover;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: #fff;
}

.pixel-label {
  margin: 0;
  font-family: "Press Start 2P", monospace;
  font-size: 10px;
  color: #333;
  letter-spacing: 0.4px;
}

.brand-title {
  margin: 6px 0 0;
  font-family: "Outfit", "Noto Sans SC", sans-serif;
  font-size: clamp(1.2rem, 2.4vw, 1.7rem);
  font-weight: 600;
}

.hero-card,
.section-block {
  margin-top: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
}

.hero-card {
  padding: clamp(18px, 4vw, 32px);
}

.hero-card h2 {
  margin: 0;
  font-family: "Outfit", "Noto Sans SC", sans-serif;
  font-size: clamp(1.35rem, 3vw, 2rem);
  font-weight: 600;
}

.hero-card p {
  margin: 12px 0 0;
  color: var(--muted);
  max-width: 720px;
}

.section-block {
  padding: 18px;
}

.section-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 8px;
  margin-bottom: 14px;
}

.section-head h3,
.section-head h2 {
  margin: 0;
  font-family: "Outfit", "Noto Sans SC", sans-serif;
  font-size: 1.22rem;
  font-weight: 600;
}

.section-note {
  color: var(--muted);
  font-size: 0.9rem;
}

.download-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
}

.preview-grid {
  display: flex;
  gap: 14px;
  overflow-x: auto;
  overscroll-behavior-inline: contain;
  padding: 2px 2px 12px;
  scroll-padding-inline: 2px;
  scroll-snap-type: x mandatory;
  scrollbar-width: thin;
}

.preview-grid::-webkit-scrollbar {
  height: 8px;
}

.preview-grid::-webkit-scrollbar-track {
  background: #ededeb;
  border-radius: 999px;
}

.preview-grid::-webkit-scrollbar-thumb {
  background: #c8c8c1;
  border-radius: 999px;
}

.preview-card {
  flex: 0 0 clamp(132px, 17vw, 178px);
  margin: 0;
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
  background: #f5f5f2;
  aspect-ratio: 9 / 19.5;
  cursor: zoom-in;
  scroll-snap-align: start;
  transition: border-color 0.2s ease-out, transform 0.2s ease-out;
}

.preview-grid-desktop .preview-card {
  flex-basis: clamp(240px, 33vw, 380px);
  aspect-ratio: 16 / 9;
}

.preview-card:hover {
  border-color: var(--line-dark);
  transform: translateY(-2px);
}

.preview-card:focus-visible {
  outline: 2px solid #232323;
  outline-offset: 3px;
}

.preview-card img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.preview-lightbox {
  position: fixed;
  inset: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: minmax(44px, 1fr) minmax(0, auto) minmax(44px, 1fr);
  align-items: center;
  justify-items: center;
  gap: 14px;
  padding: clamp(14px, 3vw, 28px);
  background: rgba(12, 12, 12, 0.82);
}

.preview-lightbox-frame {
  grid-column: 2;
  margin: 0;
  min-width: 0;
  max-width: min(1120px, 84vw);
  max-height: 86vh;
  display: grid;
  gap: 10px;
  justify-items: center;
}

.preview-lightbox-frame img {
  display: block;
  max-width: 100%;
  max-height: calc(86vh - 34px);
  object-fit: contain;
  border-radius: 12px;
  background: #f5f5f2;
}

.preview-lightbox-caption {
  color: #fff;
  font-size: 0.92rem;
}

.preview-lightbox-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 999px;
  color: #fff;
  background: rgba(255, 255, 255, 0.12);
  cursor: pointer;
  transition: background-color 0.2s ease-out, border-color 0.2s ease-out;
}

.preview-lightbox-btn:hover {
  background: rgba(255, 255, 255, 0.2);
  border-color: rgba(255, 255, 255, 0.45);
}

.preview-lightbox-btn:focus-visible {
  outline: 2px solid #fff;
  outline-offset: 3px;
}

.preview-lightbox-btn svg {
  width: 22px;
  height: 22px;
}

.preview-lightbox-close {
  position: absolute;
  top: clamp(12px, 3vw, 24px);
  right: clamp(12px, 3vw, 24px);
}

.preview-lightbox-prev {
  grid-column: 1;
  justify-self: end;
}

.preview-lightbox-next {
  grid-column: 3;
  justify-self: start;
}

.preview-lightbox-nav[disabled] {
  opacity: 0.35;
  cursor: default;
}

.empty-note {
  margin: 0;
  padding: 14px;
  color: var(--muted);
  border: 1px dashed var(--line-dark);
  border-radius: 10px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  min-height: 42px;
  border-radius: 10px;
  border: 1px solid transparent;
  text-decoration: none;
  font-weight: 600;
  padding: 0 14px;
  transition: background-color 0.2s ease-out, color 0.2s ease-out, border-color 0.2s ease-out;
}

.btn:focus-visible,
.changelog-toggle:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 2px solid #232323;
  outline-offset: 2px;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-primary:hover {
  background: #2a2a2a;
}

.btn-secondary {
  margin-top: 12px;
  border-color: var(--accent);
  color: var(--accent);
  background: #fff;
}

.btn-secondary:hover {
  background: #f3f3f1;
}

.btn-ghost {
  border-color: var(--line);
  color: var(--ink);
  background: #fff;
}

.btn-ghost:hover {
  border-color: var(--line-dark);
  background: #f6f6f4;
}

.download-btn {
  width: 100%;
}

.changelog-wrap {
  padding: 0;
  overflow: hidden;
}

.changelog-toggle {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border: 0;
  border-bottom: 1px solid transparent;
  background: #fff;
  color: inherit;
  font: inherit;
  cursor: pointer;
  padding: 16px 18px;
  transition: background-color 0.2s ease-out;
}

.changelog-toggle:hover {
  background: #f7f7f5;
}

.chevron {
  width: 20px;
  height: 20px;
  transition: transform 0.2s ease-out;
}

.changelog-toggle[aria-expanded="true"] .chevron {
  transform: rotate(180deg);
}

.changelog-panel {
  border-top: 1px solid var(--line);
  padding: 12px 18px 18px;
}

.changelog-list {
  display: grid;
  gap: 10px;
}

.log-item {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 12px;
}

.log-item h4 {
  margin: 0;
  font-family: "Outfit", "Noto Sans SC", sans-serif;
}

.log-meta {
  margin: 4px 0 8px;
  color: var(--muted);
  font-size: 0.88rem;
}

.log-content {
  margin: 0;
  color: #2c2c2c;
  white-space: pre-wrap;
  word-break: break-word;
}

.friend-section {
  padding: 0;
}

.friend-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  flex-wrap: wrap;
}

.friend-label {
  font-family: "Outfit", "Noto Sans SC", sans-serif;
  font-weight: 600;
}

.friend-links {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.friend-link-item {
  color: #2d2d2d;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease-out, color 0.2s ease-out;
}

.friend-link-item:hover {
  color: #000;
  border-color: #000;
}

input,
textarea {
  width: 100%;
  border: 1px solid var(--line-dark);
  border-radius: 10px;
  padding: 10px 12px;
  font: inherit;
  background: #fff;
}

@media (max-width: 1024px) {
  .download-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 768px) {
  .site-shell {
    width: min(1120px, 95vw);
    padding-top: 14px;
  }

  .topbar {
    flex-direction: column;
    align-items: flex-start;
  }

  .download-grid {
    grid-template-columns: 1fr;
  }

  .preview-grid {
    gap: 12px;
    margin-inline: -18px;
    padding-inline: 18px;
  }

  .preview-card {
    flex-basis: 128px;
  }

  .preview-grid-desktop .preview-card {
    flex-basis: 260px;
  }

  .preview-lightbox {
    grid-template-columns: 1fr 1fr;
    grid-template-rows: 1fr auto;
    gap: 12px;
    padding: 14px;
  }

  .preview-lightbox-frame {
    grid-column: 1 / -1;
    grid-row: 1;
    max-width: 100%;
    max-height: 82vh;
  }

  .preview-lightbox-frame img {
    max-height: calc(82vh - 34px);
  }

  .preview-lightbox-prev,
  .preview-lightbox-next {
    grid-row: 2;
    justify-self: center;
  }

  .preview-lightbox-prev {
    grid-column: 1;
  }

  .preview-lightbox-next {
    grid-column: 2;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
    animation: none !important;
  }
}