:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: "SF Mono", Consolas, monospace;
  --theme-color: #1a73e8;
  --theme-heading: #1a73e8;
  --theme-header: #1a73e8;
  --theme-border: #e8f0fe;
  --theme-notice: #e8f0fe;
  --theme-button: #1a73e8;
  --theme-button-hover: #1765cc;
  --theme-button-active: #1357b0;
  --theme-shadow: 26, 115, 232;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
body {
  font-family: var(--font-sans);
  font-size: 1rem;
  color: #202124;
  background: #fff;
  line-height: 1.6;
}
a {
  color: var(--theme-color);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

.app-page header {
  background: var(--theme-header);
  color: #fff;
  padding: 48px 24px;
  text-align: center;
}
.app-page header img {
  width: 96px;
  height: 96px;
  object-fit: contain;
  border-radius: 20px;
  margin-bottom: 16px;
  display: block;
  margin-left: auto;
  margin-right: auto;
}
.app-page header h1 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 8px;
}
.app-page header p {
  font-size: 1.1rem;
  opacity: 0.9;
  max-width: 580px;
  margin: 0 auto;
}

.app-page nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 8px 24px;
  background: #f8f9fa;
  border-bottom: 1px solid #e0e0e0;
  padding: 12px 24px;
  text-align: center;
  position: sticky;
  top: 0;
  z-index: 100;
}
.app-page nav a {
  white-space: nowrap;
  font-size: 0.95rem;
  color: var(--theme-color);
  font-weight: 500;
}

.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 40px 24px;
  overflow-wrap: anywhere;
}

.section {
  margin-bottom: 64px;
}
.section:last-child {
  margin-bottom: 0;
}
.section h2 {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--theme-heading);
  border-bottom: 2px solid var(--theme-border);
  padding-bottom: 8px;
  margin-bottom: 24px;
}
.section h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin: 24px 0 8px;
  color: #202124;
}
.section p {
  margin-bottom: 12px;
  color: #3c4043;
}
.section ul,
.section ol {
  margin: 8px 0 12px 20px;
  color: #3c4043;
}
.section ul li,
.section ol li {
  margin-bottom: 4px;
}
.section code {
  background: #f1f3f4;
  padding: 1px 5px;
  border-radius: 4px;
  font-size: 0.88rem;
  font-family: var(--font-mono);
}

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 220px), 1fr));
  gap: 16px;
  margin: 24px 0;
}
.feature {
  background: #f3f4f6;
  border-radius: 14px;
  padding: 24px;
}
.feature h3 {
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: 6px;
  color: #111;
  margin-top: 0;
}
.feature p {
  font-size: 0.88rem;
  color: #555;
  margin: 0;
  line-height: 1.6;
}

.meta {
  font-size: 0.85rem;
  color: #80868b;
  margin-bottom: 20px;
}

.notice {
  background: var(--theme-notice);
  border-left: 4px solid var(--theme-color);
  padding: 16px 20px;
  margin: 16px 0;
  border-radius: 0 8px 8px 0;
}
.notice-title {
  display: block;
  margin-bottom: 4px;
}

.warning {
  background: #fef9e7;
  border-left: 4px solid #f59e0b;
  padding: 16px 20px;
  margin: 16px 0;
  border-radius: 0 8px 8px 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 12px 0;
}
thead tr {
  background: #f8f9fa;
}
th {
  text-align: left;
  padding: 12px 16px;
  border: 1px solid #e0e0e0;
  font-size: 0.9rem;
  vertical-align: top;
}
td {
  padding: 12px 16px;
  border: 1px solid #e0e0e0;
  font-size: 0.9rem;
  color: #3c4043;
  vertical-align: top;
}
td code {
  background: #f1f3f4;
  padding: 1px 5px;
  border-radius: 4px;
  font-size: 0.82rem;
}

.install-button {
  width: fit-content;
  max-width: 100%;
  justify-content: center;
  text-align: center;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 28px;
  background: var(--theme-button);
  color: #fff;
  border-radius: 50px;
  font-size: 1.05rem;
  font-weight: 700;
  text-decoration: none;
  box-shadow: 0 2px 8px rgba(var(--theme-shadow), 0.25);
  transition:
    background 0.15s,
    box-shadow 0.15s,
    transform 0.1s;
  margin: 0 0 8px;
}
.install-button:hover {
  background: var(--theme-button-hover);
  box-shadow: 0 4px 14px rgba(var(--theme-shadow), 0.35);
  transform: translateY(-1px);
  text-decoration: none;
}
.install-button:active {
  background: var(--theme-button-active);
  transform: scale(0.98);
}
.install-button:focus-visible {
  outline: 3px solid var(--theme-color);
  outline-offset: 4px;
}
.install-button svg {
  width: 22px;
  height: 22px;
  flex-shrink: 0;
}
.section .install-note {
  font-size: 0.82rem;
  color: #80868b;
  margin-bottom: 20px;
}

.app-page footer {
  background: #f8f9fa;
  border-top: 1px solid #e0e0e0;
  text-align: center;
  padding: 24px;
  font-size: 0.85rem;
  color: #5f6368;
}

@media (max-width: 600px) {
  .app-page nav {
    gap: 8px 16px;
    padding: 12px 16px;
  }

  th,
  td {
    padding: 10px 12px;
  }
}