:root {
  --clr-primary: #2b6cb0;
  --clr-primary-light: #4a90d9;
  --clr-primary-dark: #1a4a7a;
  --clr-accent: #e53e3e;
  --clr-accent-light: #fc8181;
  --clr-bg: #f7fafc;
  --clr-bg-alt: #edf2f7;
  --clr-surface: #ffffff;
  --clr-surface-glass: rgba(255, 255, 255, 0.72);
  --clr-border: #e2e8f0;
  --clr-text: #1a202c;
  --clr-text-secondary: #4a5568;
  --clr-text-muted: #718096;
  --clr-shadow: rgba(43, 108, 176, 0.12);
  --clr-shadow-lg: rgba(43, 108, 176, 0.2);
  --gradient-hero: linear-gradient(135deg, #1a365d 0%, #2b6cb0 40%, #4a90d9 70%, #63b3ed 100%);
  --gradient-card: linear-gradient(135deg, rgba(43, 108, 176, 0.05), rgba(99, 179, 237, 0.08));
  --gradient-accent: linear-gradient(135deg, #e53e3e, #ed8936);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-xl: 32px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 1180px;
  --header-height: 68px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --clr-bg: #0d1117;
    --clr-bg-alt: #161b22;
    --clr-surface: #1c2333;
    --clr-surface-glass: rgba(28, 35, 51, 0.78);
    --clr-border: #2d3748;
    --clr-text: #e2e8f0;
    --clr-text-secondary: #a0aec0;
    --clr-text-muted: #718096;
    --clr-shadow: rgba(0, 0, 0, 0.35);
    --clr-shadow-lg: rgba(0, 0, 0, 0.5);
    --gradient-hero: linear-gradient(135deg, #0d1b2a 0%, #1a365d 40%, #2b6cb0 75%, #4a90d9 100%);
    --gradient-card: linear-gradient(135deg, rgba(43, 108, 176, 0.12), rgba(99, 179, 237, 0.06));
  }
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 20px);
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.8;
  color: var(--clr-text);
  background-color: var(--clr-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  transition: background-color var(--transition-base), color var(--transition-base);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--clr-primary);
  text-decoration: none;
  transition: color var(--transition-fast), opacity var(--transition-fast);
}

a:hover {
  color: var(--clr-primary-light);
}

a:focus-visible {
  outline: 2px solid var(--clr-primary);
  outline-offset: 3px;
  border-radius: 4px;
}

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4 {
  line-height: 1.35;
  font-weight: 700;
  letter-spacing: -0.01em;
}

h1 {
  font-size: clamp(1.75rem, 4.5vw, 3rem);
}

h2 {
  font-size: clamp(1.4rem, 3vw, 2.1rem);
  margin-bottom: 1rem;
  position: relative;
}

h2::after {
  content: "";
  display: block;
  width: 56px;
  height: 4px;
  margin-top: 10px;
  border-radius: 2px;
  background: var(--gradient-hero);
}

h3 {
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  margin-bottom: 0.6rem;
  color: var(--clr-text);
}

p {
  margin-bottom: 1rem;
  color: var(--clr-text-secondary);
}

blockquote {
  border-left: 4px solid var(--clr-primary);
  padding: 1rem 1.25rem;
  margin: 1rem 0;
  background: var(--gradient-card);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-style: italic;
}

blockquote p {
  margin-bottom: 0;
  color: var(--clr-text);
}

time {
  font-size: 0.85rem;
  color: var(--clr-text-muted);
}

details {
  margin-bottom: 0.75rem;
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  background: var(--clr-surface);
  overflow: hidden;
  transition: box-shadow var(--transition-base), border-color var(--transition-base);
}

details:hover {
  border-color: var(--clr-primary-light);
  box-shadow: 0 4px 16px var(--clr-shadow);
}

details[open] {
  border-color: var(--clr-primary);
  box-shadow: 0 6px 24px var(--clr-shadow);
}

details summary {
  padding: 1rem 1.25rem;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--clr-text);
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  transition: background var(--transition-fast);
  user-select: none;
}

details summary::-webkit-details-marker {
  display: none;
}

details summary::before {
  content: "+";
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--gradient-hero);
  color: #fff;
  font-size: 1rem;
  font-weight: 400;
  flex-shrink: 0;
  transition: transform var(--transition-base);
}

details[open] summary::before {
  content: "−";
  transform: rotate(180deg);
}

details summary:hover {
  background: var(--gradient-card);
}

details p {
  padding: 0 1.25rem 1.25rem 1.25rem;
  font-size: 0.92rem;
  color: var(--clr-text-secondary);
  margin-bottom: 0;
  animation: fadeSlideIn 0.3s ease;
}

@keyframes fadeSlideIn {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

header[role="banner"] {
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--header-height);
  background: var(--clr-surface-glass);
  backdrop-filter: blur(18px) saturate(180%);
  -webkit-backdrop-filter: blur(18px) saturate(180%);
  border-bottom: 1px solid var(--clr-border);
  transition: background var(--transition-base), box-shadow var(--transition-base);
}

header[role="banner"]:hover {
  box-shadow: 0 4px 30px var(--clr-shadow);
}

nav[aria-label="主导航"] {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.25rem;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

nav[aria-label="主导航"] > a:first-child {
  font-size: 1.25rem;
  font-weight: 800;
  background: var(--gradient-hero);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -0.02em;
  white-space: nowrap;
  transition: opacity var(--transition-fast);
}

nav[aria-label="主导航"] > a:first-child:hover {
  opacity: 0.8;
}

nav[aria-label="主导航"] ul {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  flex-wrap: wrap;
}

nav[aria-label="主导航"] ul li a {
  display: block;
  padding: 0.45rem 0.85rem;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--clr-text-secondary);
  border-radius: var(--radius-sm);
  position: relative;
  transition: color var(--transition-fast), background var(--transition-fast);
}

nav[aria-label="主导航"] ul li a::after {
  content: "";
  position: absolute;
  bottom: 2px;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--gradient-hero);
  border-radius: 1px;
  transform: translateX(-50%);
  transition: width var(--transition-base);
}

nav[aria-label="主导航"] ul li a:hover {
  color: var(--clr-primary);
  background: var(--gradient-card);
}

nav[aria-label="主导航"] ul li a:hover::after {
  width: 60%;
}

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.25rem;
}

section {
  padding: 3.5rem 0;
}

section + section {
  border-top: 1px solid var(--clr-border);
}

section > h2 {
  margin-bottom: 1.5rem;
}

section > h3 {
  margin-top: 1.75rem;
}

section > h3:first-of-type {
  margin-top: 0.5rem;
}

#hero {
  position: relative;
  margin: 1.5rem 0 0;
  padding: 3.5rem 2.5rem;
  border-radius: var(--radius-xl);
  background: var(--gradient-hero);
  color: #fff;
  overflow: hidden;
  isolation: isolate;
}

#hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 80%, rgba(255, 255, 255, 0.12) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(255, 255, 255, 0.08) 0%, transparent 45%),
    radial-gradient(circle at 50% 50%, rgba(255, 255, 255, 0.05) 0%, transparent 60%);
  z-index: -1;
}

#hero::after {
  content: "";
  position: absolute;
  top: -40%;
  right: -15%;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
  animation: heroFloat 8s ease-in-out infinite;
  z-index: -1;
}

@keyframes heroFloat {
  0%, 100% {
    transform: translate(0, 0) scale(1);
  }
  50% {
    transform: translate(-20px, 20px) scale(1.08);
  }
}

#hero h1 {
  color: #fff;
  margin-bottom: 1.25rem;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.15);
  animation: heroSlideUp 0.8s ease both;
}

#hero p {
  color: rgba(255, 255, 255, 0.92);
  font-size: 1.05rem;
  max-width: 720px;
  animation: heroSlideUp 0.8s 0.15s ease both;
}

#hero p:last-child {
  margin-top: 1.5rem;
  margin-bottom: 0;
  animation-delay: 0.3s;
}

#hero p:last-child a {
  display: inline-block;
  padding: 0.55rem 1.4rem;
  margin: 0.25rem 0.35rem 0.25rem 0;
  border-radius: 50px;
  font-weight: 600;
  font-size: 0.92rem;
  color: #fff;
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.25);
  transition: background var(--transition-base), transform var(--transition-base), box-shadow var(--transition-base);
}

#hero p:last-child a:hover {
  background: rgba(255, 255, 255, 0.28);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
  color: #fff;
}

@keyframes heroSlideUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

#about,
#product,
#solution,
#case,
#news,
#knowledge,
#howto,
#faq,
#contact,
#sitemap,
#legal {
  animation: sectionFadeIn 0.7s ease both;
}

@keyframes sectionFadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

#product ul {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1rem;
  margin: 1.25rem 0;
}

#product ul li {
  position: relative;
  padding: 1.15rem 1.25rem 1.15rem 3.2rem;
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  font-size: 0.92rem;
  color: var(--clr-text-secondary);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

#product ul li::before {
  content: "✓";
  position: absolute;
  left: 1.1rem;
  top: 1.15rem;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--gradient-hero);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
}

#product ul li:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px var(--clr-shadow);
  border-color: var(--clr-primary-light);
}

#solution h3,
#case h3,
#about h3,
#howto h3,
#contact h3,
#legal h3 {
  padding-left: 1rem;
  position: relative;
}

#solution h3::before,
#case h3::before,
#about h3::before,
#howto h3::before,
#contact h3::before,
#legal h3::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.25em;
  bottom: 0.25em;
  width: 4px;
  border-radius: 2px;
  background: var(--gradient-hero);
}

#case blockquote {
  background: var(--gradient-card);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--clr-border);
  border-left: 4px solid var(--clr-primary);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

#case blockquote:hover {
  transform: translateX(6px);
  box-shadow: 0 8px 28px var(--clr-shadow);
}

#news article {
  padding: 1.5rem;
  margin-bottom: 1rem;
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
  position: relative;
  overflow: hidden;
}

#news article::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--gradient-hero);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-base);
}

#news article:hover {
  transform: translateY(-5px);
  box-shadow: 0 16px 40px var(--clr-shadow-lg);
  border-color: var(--clr-primary-light);
}

#news article:hover::before {
  transform: scaleX(1);
}

#news article h3 {
  margin-bottom: 0.35rem;
  transition: color var(--transition-fast);
}

#news article:hover h3 {
  color: var(--clr-primary);
}

#news article p {
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
}

#news article a {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--clr-primary);
  transition: gap var(--transition-base), color var(--transition-fast);
}

#news article a::after {
  content: "→";
  transition: transform var(--transition-base);
}

#news article a:hover {
  gap: 0.6rem;
  color: var(--clr-primary-light);
}

#news article a:hover::after {
  transform: translateX(4px);
}

#knowledge {
  background: var(--gradient-card);
  border-radius: var(--radius-lg);
  padding: 2.5rem 2rem;
  margin: 1.5rem 0;
  border: 1px solid var(--clr-border);
}

#howto ol {
  counter-reset: howto-step;
  margin: 1.25rem 0;
  display: grid;
  gap: 0.75rem;
}

#howto ol li {
  counter-increment: howto-step;
  position: relative;
  padding: 1rem 1.25rem 1rem 3.5rem;
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  font-size: 0.92rem;
  color: var(--clr-text-secondary);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

#howto ol li::before {
  content: counter(howto-step);
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--gradient-hero);
  color: #fff;
  font-size: 0.82rem;
  font-weight: 700;
  box-shadow: 0 2px 8px var(--clr-shadow);
}

#howto ol li:hover {
  transform: translateX(6px);
  box-shadow: 0 8px 24px var(--clr-shadow);
  border-color: var(--clr-primary-light);
}

#faq details {
  background: var(--clr-surface-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

#contact address {
  font-style: normal;
  padding: 1.5rem;
  background: var(--gradient-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--clr-border);
  margin-bottom: 1.5rem;
  transition: box-shadow var(--transition-base);
}

#contact address:hover {
  box-shadow: 0 8px 28px var(--clr-shadow);
}

#contact address p {
  margin-bottom: 0.5rem;
  font-size: 0.92rem;
}

#contact address p:last-child {
  margin-bottom: 0;
}

#contact address a {
  font-weight: 600;
  position: relative;
}

#contact address a::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--transition-base);
}

#contact address a:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

#sitemap ul {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 0.5rem;
  margin: 1rem 0 1.5rem;
}

#sitemap ul li a {
  display: block;
  padding: 0.5rem 0.85rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  color: var(--clr-text-secondary);
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  transition: background var(--transition-fast), color var(--transition-fast), transform var(--transition-fast), border-color var(--transition-fast);
}

#sitemap ul li a:hover {
  background: var(--gradient-hero);
  color: #fff;
  border-color: transparent;
  transform: translateY(-2px);
}

#sitemap h3 {
  margin-top: 1.5rem;
}

#legal {
  padding-bottom: 2rem;
}

#legal p small {
  display: block;
  font-size: 0.82rem;
  color: var(--clr-text-muted);
  margin-bottom: 0.25rem;
}

footer[role="contentinfo"] {
  margin-top: 2rem;
  padding: 2.5rem 1.25rem;
  background: var(--clr-bg-alt);
  border-top: 1px solid var(--clr-border);
  text-align: center;
  transition: background var(--transition-base);
}

footer[role="contentinfo"] p {
  font-size: 0.88rem;
  color: var(--clr-text-muted);
  margin-bottom: 0.5rem;
}

footer[role="contentinfo"] p:first-child {
  font-weight: 600;
  color: var(--clr-text-secondary);
  font-size: 0.95rem;
}

footer[role="contentinfo"] a {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  margin-top: 0.5rem;
  padding: 0.45rem 1.2rem;
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--clr-primary);
  border: 1px solid var(--clr-primary);
  transition: background var(--transition-base), color var(--transition-base), transform var(--transition-base), box-shadow var(--transition-base);
}

footer[role="contentinfo"] a::before {
  content: "↑";
  transition: transform var(--transition-base);
}

footer[role="contentinfo"] a:hover {
  background: var(--clr-primary);
  color: #fff;
  transform: translateY(-3px);
  box-shadow: 0 8px 24px var(--clr-shadow-lg);
}

footer[role="contentinfo"] a:hover::before {
  transform: translateY(-2px);
}

::selection {
  background: var(--clr-primary);
  color: #fff;
}

::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--clr-bg-alt);
}

::-webkit-scrollbar-thumb {
  background: var(--clr-primary-light);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--clr-primary);
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

@media (max-width: 900px) {
  :root {
    --header-height: 60px;
  }

  nav[aria-label="主导航"] ul {
    gap: 0;
  }

  nav[aria-label="主导航"] ul li a {
    padding: 0.4rem 0.6rem;
    font-size: 0.82rem;
  }

  section {
    padding: 2.5rem 0;
  }

  #hero {
    padding: 2.5rem 1.5rem;
    border-radius: var(--radius-lg);
  }

  #knowledge {
    padding: 1.75rem 1.25rem;
  }
}

@media (max-width: 640px) {
  :root {
    --header-height: 56px;
  }

  body {
    font-size: 15px;
  }

  nav[aria-label="主导航"] {
    padding: 0 0.85rem;
  }

  nav[aria-label="主导航"] > a:first-child {
    font-size: 1.05rem;
  }

  nav[aria-label="主导航"] ul {
    gap: 0;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    max-width: 70%;
  }

  nav[aria-label="主导航"] ul::-webkit-scrollbar {
    display: none;
  }

  nav[aria-label="主导航"] ul li a {
    padding: 0.35rem 0.5rem;
    font-size: 0.78rem;
    white-space: nowrap;
  }

  main {
    padding: 0 0.85rem;
  }

  section {
    padding: 2rem 0;
  }

  #hero {
    margin: 1rem 0 0;
    padding: 2rem 1.25rem;
    border-radius: var(--radius-md);
  }

  #hero p {
    font-size: 0.95rem;
  }

  #hero p:last-child a {
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
    display: block;
    text-align: center;
    margin: 0.35rem 0;
  }

  #product ul {
    grid-template-columns: 1fr;
  }

  #product ul li {
    padding: 1rem 1rem 1rem 2.8rem;
  }

  #product ul li::before {
    left: 0.85rem;
    top: 1rem;
  }

  #news article {
    padding: 1.15rem;
    border-radius: var(--radius-md);
  }

  #howto ol li {
    padding: 0.85rem 1rem 0.85rem 3rem;
  }

  #howto ol li::before {
    left: 0.75rem;
    width: 26px;
    height: 26px;
    font-size: 0.75rem;
  }

  #contact address {
    padding: 1.15rem;
  }

  #sitemap ul {
    grid-template-columns: repeat(2, 1fr);
  }

  #knowledge {
    padding: 1.5rem 1rem;
    border-radius: var(--radius-md);
  }

  footer[role="contentinfo"] {
    padding: 2rem 1rem;
  }

  details summary {
    padding: 0.85rem 1rem;
    font-size: 0.88rem;
  }

  details p {
    padding: 0 1rem 1rem 1rem;
    font-size: 0.86rem;
  }
}

@media (min-width: 641px) and (max-width: 900px) {
  #sitemap ul {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 1200px) {
  #hero {
    padding: 4.5rem 3.5rem;
  }

  #hero p {
    font-size: 1.12rem;
  }

  #news {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
  }

  #news > h2,
  #news > p {
    grid-column: 1 / -1;
  }

  #news article {
    margin-bottom: 0;
  }
}

@media print {
  header[role="banner"],
  footer[role="contentinfo"],
  #hero::before,
  #hero::after {
    display: none;
  }

  body {
    background: #fff;
    color: #000;
    font-size: 12pt;
  }

  #hero {
    background: none;
    color: #000;
    padding: 0;
  }

  #hero h1,
  #hero p {
    color: #000;
    text-shadow: none;
  }

  a {
    color: #000;
    text-decoration: underline;
  }

  section {
    page-break-inside: avoid;
  }
}