:root {
  --bg: #f4f5fb;
  --bg-alt: #ffffff;
  --surface: rgba(255, 255, 255, 0.72);
  --surface-solid: #ffffff;
  --glass-border: rgba(255, 255, 255, 0.55);
  --text: #1a1a2e;
  --text-soft: #4a4a63;
  --text-muted: #77778c;
  --primary: #e94560;
  --primary-dark: #c72f49;
  --secondary: #f5a623;
  --accent: #0f3460;
  --navy: #16213e;
  --border: rgba(26, 26, 46, 0.1);
  --shadow-sm: 0 2px 8px rgba(22, 33, 62, 0.08);
  --shadow-md: 0 8px 24px rgba(22, 33, 62, 0.12);
  --shadow-lg: 0 18px 48px rgba(22, 33, 62, 0.18);
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --header-h: 72px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --gradient-hero: linear-gradient(135deg, #1a1a2e 0%, #16213e 45%, #0f3460 100%);
  --gradient-accent: linear-gradient(135deg, #e94560 0%, #f5a623 100%);
  --gradient-soft: linear-gradient(135deg, rgba(233, 69, 96, 0.12), rgba(245, 166, 35, 0.12));
}

html[data-theme="dark"] {
  --bg: #0d0d16;
  --bg-alt: #14141f;
  --surface: rgba(30, 30, 48, 0.72);
  --surface-solid: #1a1a2e;
  --glass-border: rgba(255, 255, 255, 0.08);
  --text: #eef0f8;
  --text-soft: #c3c6d6;
  --text-muted: #8f93a8;
  --primary: #ff5c78;
  --primary-dark: #e94560;
  --secondary: #ffb84d;
  --accent: #4a7fc1;
  --border: rgba(255, 255, 255, 0.1);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 18px 48px rgba(0, 0, 0, 0.6);
  --gradient-hero: linear-gradient(135deg, #0d0d16 0%, #1a1a2e 50%, #0f3460 100%);
  --gradient-soft: linear-gradient(135deg, rgba(255, 92, 120, 0.14), rgba(255, 184, 77, 0.14));
}

@media (prefers-color-scheme: dark) {
  html:not([data-theme="light"]) {
    --bg: #0d0d16;
    --bg-alt: #14141f;
    --surface: rgba(30, 30, 48, 0.72);
    --surface-solid: #1a1a2e;
    --glass-border: rgba(255, 255, 255, 0.08);
    --text: #eef0f8;
    --text-soft: #c3c6d6;
    --text-muted: #8f93a8;
    --primary: #ff5c78;
    --primary-dark: #e94560;
    --secondary: #ffb84d;
    --accent: #4a7fc1;
    --border: rgba(255, 255, 255, 0.1);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 18px 48px rgba(0, 0, 0, 0.6);
    --gradient-hero: linear-gradient(135deg, #0d0d16 0%, #1a1a2e 50%, #0f3460 100%);
    --gradient-soft: linear-gradient(135deg, rgba(255, 92, 120, 0.14), rgba(255, 184, 77, 0.14));
  }
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 16px);
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.75;
  font-size: 16px;
  overflow-x: hidden;
  transition: background var(--transition), color var(--transition);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(circle at 12% 8%, rgba(233, 69, 96, 0.14), transparent 42%),
    radial-gradient(circle at 88% 4%, rgba(245, 166, 35, 0.12), transparent 40%),
    radial-gradient(circle at 50% 100%, rgba(15, 52, 96, 0.14), transparent 55%);
  pointer-events: none;
}

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

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

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

ul,
ol {
  list-style: none;
}

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

h1 {
  font-size: clamp(1.6rem, 4vw, 2.4rem);
}

h2 {
  font-size: clamp(1.35rem, 3vw, 1.9rem);
}

h3 {
  font-size: clamp(1.1rem, 2.2vw, 1.3rem);
}

p {
  color: var(--text-soft);
}

strong {
  color: var(--text);
  font-weight: 700;
}

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

:focus-visible {
  outline: 3px solid var(--secondary);
  outline-offset: 3px;
  border-radius: 4px;
}

#site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--header-h);
  background: var(--surface);
  backdrop-filter: saturate(180%) blur(18px);
  -webkit-backdrop-filter: saturate(180%) blur(18px);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: var(--shadow-sm);
  transition: background var(--transition), box-shadow var(--transition);
}

.header-inner {
  max-width: 1240px;
  height: 100%;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 20px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.logo {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  box-shadow: 0 4px 14px rgba(233, 69, 96, 0.35);
  transition: transform var(--transition);
}

.brand:hover .logo {
  transform: rotate(-6deg) scale(1.06);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.brand-name {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text);
  letter-spacing: 0.02em;
}

.brand-sub {
  font-size: 0.72rem;
  color: var(--primary);
  font-weight: 600;
  letter-spacing: 0.08em;
}

#main-nav {
  flex: 1;
  display: flex;
  justify-content: center;
}

#main-nav ul {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-wrap: wrap;
}

#main-nav a {
  display: inline-block;
  padding: 8px 12px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-soft);
  border-radius: var(--radius-sm);
  position: relative;
  transition: color var(--transition), background var(--transition);
}

#main-nav a::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 3px;
  height: 2px;
  border-radius: 2px;
  background: var(--gradient-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}

#main-nav a:hover {
  color: var(--text);
  background: var(--gradient-soft);
}

#main-nav a:hover::after {
  transform: scaleX(1);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

#site-search {
  display: flex;
  align-items: center;
  background: var(--surface-solid);
  border: 1px solid var(--border);
  border-radius: 999px;
  overflow: hidden;
  transition: box-shadow var(--transition), border-color var(--transition);
}

#site-search:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(233, 69, 96, 0.15);
}

#site-search input {
  border: none;
  outline: none;
  background: transparent;
  padding: 9px 14px;
  font-size: 0.85rem;
  color: var(--text);
  width: 150px;
  transition: width var(--transition);
}

#site-search input::placeholder {
  color: var(--text-muted);
}

#site-search input:focus {
  width: 190px;
}

#site-search button {
  border: none;
  cursor: pointer;
  padding: 9px 16px;
  font-size: 0.85rem;
  font-weight: 600;
  color: #fff;
  background: var(--gradient-accent);
  transition: filter var(--transition);
}

#site-search button:hover {
  filter: brightness(1.08);
}

#theme-toggle,
#menu-toggle {
  width: 42px;
  height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  cursor: pointer;
  border: 1px solid var(--border);
  border-radius: 50%;
  background: var(--surface-solid);
  color: var(--text);
  transition: transform var(--transition), box-shadow var(--transition),
    background var(--transition);
}

#theme-toggle:hover,
#menu-toggle:hover {
  transform: translateY(-2px) scale(1.05);
  box-shadow: var(--shadow-md);
}

#menu-toggle {
  display: none;
}

#banner {
  max-width: 1240px;
  margin: 28px auto 0;
  padding: 0 24px;
}

.carousel {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  background: var(--gradient-hero);
  isolation: isolate;
}

.slide {
  display: none;
  position: relative;
  animation: fadeSlide 0.7s ease both;
}

.slide.active {
  display: block;
}

.slide svg {
  width: 100%;
  height: auto;
  min-height: 240px;
  object-fit: cover;
}

.slide-caption {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 14px;
  padding: clamp(20px, 5vw, 64px);
  background: linear-gradient(
    90deg,
    rgba(13, 13, 22, 0.78) 0%,
    rgba(13, 13, 22, 0.45) 55%,
    rgba(13, 13, 22, 0.05) 100%
  );
}

.slide-caption h2 {
  color: #fff;
  max-width: 620px;
  font-size: clamp(1.25rem, 3.2vw, 2.1rem);
  text-shadow: 0 2px 18px rgba(0, 0, 0, 0.45);
}

.slide-caption p {
  color: rgba(255, 255, 255, 0.86);
  max-width: 560px;
  font-size: clamp(0.85rem, 1.6vw, 1rem);
}

.carousel-prev,
.carousel-next {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.35);
  background: rgba(255, 255, 255, 0.14);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  color: #fff;
  font-size: 1.6rem;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 3;
  transition: background var(--transition), transform var(--transition);
}

.carousel-prev {
  left: 18px;
}

.carousel-next {
  right: 18px;
}

.carousel-prev:hover,
.carousel-next:hover {
  background: rgba(233, 69, 96, 0.85);
  transform: translateY(-50%) scale(1.08);
}

.carousel-dots {
  position: absolute;
  bottom: 18px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 10px;
  z-index: 3;
}

.carousel-dots button {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: none;
  cursor: pointer;
  background: rgba(255, 255, 255, 0.45);
  transition: background var(--transition), width var(--transition);
}

.carousel-dots button.active,
.carousel-dots button[aria-selected="true"] {
  width: 28px;
  border-radius: 999px;
  background: var(--gradient-accent);
}

#breadcrumb {
  max-width: 1240px;
  margin: 20px auto 0;
  padding: 0 24px;
}

#breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

#breadcrumb li + li::before {
  content: "›";
  margin-right: 8px;
  color: var(--text-muted);
}

#breadcrumb a {
  color: var(--text-soft);
  font-weight: 500;
}

#breadcrumb a:hover {
  color: var(--primary);
}

#breadcrumb [aria-current="page"] {
  color: var(--primary);
  font-weight: 600;
}

main > section:not(#banner):not(#breadcrumb) {
  max-width: 1240px;
  margin: 0 auto;
  padding: 56px 24px;
}

main > section:nth-of-type(even):not(#banner):not(#breadcrumb) {
  position: relative;
}

#intro,
#about,
#products,
#services,
#scenarios,
#cases,
#news,
#articles,
#knowledge,
#faq,
#howto,
#contact,
#sitemap,
#links {
  opacity: 0;
  transform: translateY(36px);
  transition: opacity 0.7s ease, transform 0.7s ease;
  will-change: opacity, transform;
}

#intro.is-visible,
#about.is-visible,
#products.is-visible,
#services.is-visible,
#scenarios.is-visible,
#cases.is-visible,
#news.is-visible,
#articles.is-visible,
#knowledge.is-visible,
#faq.is-visible,
#howto.is-visible,
#contact.is-visible,
#sitemap.is-visible,
#links.is-visible {
  opacity: 1;
  transform: translateY(0);
}

section h2 {
  position: relative;
  padding-bottom: 14px;
  margin-bottom: 28px;
}

section h2::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 64px;
  height: 4px;
  border-radius: 4px;
  background: var(--gradient-accent);
}

#intro {
  text-align: left;
}

#intro h1 {
  margin-bottom: 20px;
  background: linear-gradient(120deg, var(--primary) 0%, var(--secondary) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.lead {
  font-size: clamp(0.95rem, 1.8vw, 1.08rem);
  line-height: 1.9;
  color: var(--text-soft);
  padding: 24px 28px;
  border-radius: var(--radius-lg);
  background: var(--surface);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: var(--shadow-md);
  border-left: 5px solid var(--primary);
}

#about article,
#products article,
#services article,
#scenarios article,
#cases article,
#news article,
#knowledge article,
#howto article {
  display: grid;
  gap: 20px;
}

#about h3,
#products h3,
#services h3,
#scenarios h3,
#cases h3,
#news h3,
#knowledge h3,
#howto h3 {
  color: var(--accent);
  padding-left: 14px;
  border-left: 4px solid var(--secondary);
  margin-top: 8px;
}

html[data-theme="dark"] #about h3,
html[data-theme="dark"] #products h3,
html[data-theme="dark"] #services h3,
html[data-theme="dark"] #scenarios h3,
html[data-theme="dark"] #cases h3,
html[data-theme="dark"] #news h3,
html[data-theme="dark"] #knowledge h3,
html[data-theme="dark"] #howto h3 {
  color: var(--secondary);
}

#about ul,
#products ul,
#howto ul,
#howto ol {
  display: grid;
  gap: 10px;
  margin: 4px 0;
}

#about ul li,
#products ul li,
#howto ul li,
#howto ol li {
  position: relative;
  padding: 12px 16px 12px 44px;
  background: var(--surface);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  color: var(--text-soft);
  font-size: 0.94rem;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: transform var(--transition), box-shadow var(--transition),
    border-color var(--transition);
}

#about ul li::before,
#products ul li::before,
#howto ul li::before {
  content: "";
  position: absolute;
  left: 18px;
  top: 50%;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--gradient-accent);
  transform: translateY(-50%);
}

#howto ol {
  counter-reset: step;
}

#howto ol li {
  counter-increment: step;
  padding-left: 52px;
}

#howto ol li::before {
  content: counter(step);
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--gradient-accent);
  color: #fff;
  font-size: 0.8rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

#about ul li:hover,
#products ul li:hover,
#howto ul li:hover,
#howto ol li:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow-md);
  border-color: rgba(233, 69, 96, 0.4);
}

#products article {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

#products h3,
#products p {
  grid-column: auto;
}

#products h3 {
  background: var(--surface);
  border: 1px solid var(--glass-border);
  border-left: 4px solid var(--secondary);
  border-radius: var(--radius-md);
  padding: 16px 18px;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}

#products h3:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

#products p {
  padding: 0 4px;
}

#products ul {
  grid-column: 1 / -1;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

#services article {
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 22px;
}

#services h3,
#services p {
  grid-column: auto;
}

#services h3 {
  background: var(--surface);
  border: 1px solid var(--glass-border);
  border-left: 4px solid var(--primary);
  border-radius: var(--radius-md);
  padding: 16px 18px;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition),
    border-color var(--transition);
}

#services h3:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary);
}

#scenarios article {
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 22px;
}

#scenarios h3,
#scenarios p {
  grid-column: auto;
}

#scenarios h3 {
  background: var(--gradient-soft);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: 16px 18px;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: transform var(--transition), box-shadow var(--transition);
}

#scenarios h3:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

#cases blockquote {
  display: grid;
  gap: 14px;
  margin-top: 8px;
}

#cases blockquote p {
  position: relative;
  padding: 20px 24px 20px 56px;
  background: var(--surface);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--shadow-sm);
  font-style: italic;
  color: var(--text-soft);
  transition: transform var(--transition), box-shadow var(--transition);
}

#cases blockquote p::before {
  content: "“";
  position: absolute;
  left: 18px;
  top: 4px;
  font-size: 2.6rem;
  font-family: Georgia, serif;
  line-height: 1;
  color: var(--primary);
  opacity: 0.65;
}

#cases blockquote p:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

#news article {
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 22px;
}

#news h3,
#news p {
  grid-column: auto;
}

#news h3 {
  background: var(--surface);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: 16px 18px;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}

#news h3:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

#news p {
  font-size: 0.92rem;
}

#articles .section-intro {
  margin-bottom: 26px;
  padding: 16px 20px;
  border-radius: var(--radius-md);
  background: var(--gradient-soft);
  border: 1px solid var(--glass-border);
  font-size: 0.94rem;
}

.article-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 22px;
}

.article-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 24px;
  border-radius: var(--radius-lg);
  background: var(--surface);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition),
    border-color var(--transition);
}

.article-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}

.article-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(233, 69, 96, 0.35);
}

.article-card:hover::before {
  transform: scaleX(1);
}

.article-card h3 {
  font-size: 1.05rem;
  color: var(--text);
  line-height: 1.5;
}

.article-card .meta {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-weight: 500;
  letter-spacing: 0.02em;
}

.article-card p:not(.meta) {
  font-size: 0.9rem;
  color: var(--text-soft);
  flex: 1;
}

.article-card a {
  align-self: flex-start;
  margin-top: 4px;
  padding: 8px 18px;
  font-size: 0.85rem;
  font-weight: 600;
  color: #fff;
  background: var(--gradient-accent);
  border-radius: 999px;
  transition: transform var(--transition), box-shadow var(--transition),
    filter var(--transition);
}

.article-card a:hover {
  color: #fff;
  transform: translateX(4px);
  box-shadow: 0 6px 18px rgba(233, 69, 96, 0.4);
  filter: brightness(1.06);
}

#knowledge article {
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 22px;
}

#knowledge h3,
#knowledge p {
  grid-column: auto;
}

#knowledge h3 {
  background: var(--surface);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: 16px 18px;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}

#knowledge h3:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.faq-list {
  display: grid;
  gap: 14px;
}

.faq-list details {
  background: var(--surface);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: box-shadow var(--transition), border-color var(--transition),
    transform var(--transition);
}

.faq-list details:hover {
  box-shadow: var(--shadow-md);
  border-color: rgba(233, 69, 96, 0.3);
}

.faq-list details[open] {
  border-color: rgba(233, 69, 96, 0.45);
  box-shadow: var(--shadow-md);
}

.faq-list summary {
  position: relative;
  cursor: pointer;
  padding: 18px 52px 18px 22px;
  font-weight: 600;
  font-size: 0.98rem;
  color: var(--text);
  list-style: none;
  user-select: none;
  transition: color var(--transition), background var(--transition);
}

.faq-list summary::-webkit-details-marker {
  display: none;
}

.faq-list summary::after {
  content: "+";
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--gradient-accent);
  color: #fff;
  font-size: 1.1rem;
  font-weight: 700;
  line-height: 1;
  transition: transform var(--transition);
}

.faq-list details[open] summary::after {
  content: "−";
  transform: translateY(-50%) rotate(180deg);
}

.faq-list summary:hover {
  color: var(--primary);
}

.faq-list details p {
  padding: 0 22px 20px;
  font-size: 0.92rem;
  color: var(--text-soft);
  animation: fadeSlide 0.35s ease both;
}

#howto article > p,
#howto article > h3 {
  margin-top: 0;
}

#contact address {
  font-style: normal;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 14px;
  margin-bottom: 26px;
}

#contact address p {
  padding: 16px 20px;
  background: var(--surface);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--shadow-sm);
  font-size: 0.92rem;
  transition: transform var(--transition), box-shadow var(--transition);
}

#contact address p:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

#contact h3 {
  margin-top: 22px;
  color: var(--accent);
  padding-left: 14px;
  border-left: 4px solid var(--secondary);
}

html[data-theme="dark"] #contact h3 {
  color: var(--secondary);
}

#sitemap ul,
#links ul {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

#sitemap a,
#links a {
  display: inline-block;
  padding: 10px 20px;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-soft);
  background: var(--surface);
  border: 1px solid var(--glass-border);
  border-radius: 999px;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), color var(--transition),
    box-shadow var(--transition), border-color var(--transition);
}

#sitemap a:hover,
#links a:hover {
  color: #fff;
  background: var(--gradient-accent);
  border-color: transparent;
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(233, 69, 96, 0.35);
}

#site-footer {
  margin-top: 40px;
  background: var(--gradient-hero);
  color: rgba(255, 255, 255, 0.82);
  padding: 56px 24px 28px;
  position: relative;
  overflow: hidden;
}

#site-footer::before {
  content: "";
  position: absolute;
  top: -120px;
  right: -80px;
  width: 320px;
  height: 320px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(233, 69, 96, 0.35), transparent 70%);
  pointer-events: none;
}

.footer-inner {
  max-width: 1240px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 32px;
  position: relative;
  z-index: 1;
}

.footer-col h3 {
  color: #fff;
  font-size: 1rem;
  margin-bottom: 14px;
  position: relative;
  padding-bottom: 10px;
}

.footer-col h3::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 36px;
  height: 3px;
  border-radius: 3px;
  background: var(--gradient-accent);
}

.footer-col p {
  color: rgba(255, 255, 255, 0.72);
  font-size: 0.86rem;
  line-height: 1.8;
  margin-bottom: 6px;
}

.footer-col a {
  color: rgba(255, 255, 255, 0.78);
  font-size: 0.86rem;
}

.footer-col a:hover {
  color: var(--secondary);
}

.footer-note {
  max-width: 1240px;
  margin: 32px auto 0;
  padding-top: 22px;
  border-top: 1px solid rgba(255, 255, 255, 0.14);
  text-align: center;
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.55);
  position: relative;
  z-index: 1;
}

#back-to-top {
  position: fixed;
  right: 22px;
  bottom: 26px;
  z-index: 900;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: none;
  cursor: pointer;
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
  background: var(--gradient-accent);
  box-shadow: 0 10px 26px rgba(233, 69, 96, 0.45);
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px) scale(0.9);
  transition: opacity var(--transition), transform var(--transition),
    visibility var(--transition), box-shadow var(--transition);
}

#back-to-top.show,
#back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}

#back-to-top:hover {
  transform: translateY(-4px) scale(1.06);
  box-shadow: 0 16px 34px rgba(233, 69, 96, 0.55);
}

@keyframes fadeSlide {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  #intro,
  #about,
  #products,
  #services,
  #scenarios,
  #cases,
  #news,
  #articles,
  #knowledge,
  #faq,
  #howto,
  #contact,
  #sitemap,
  #links {
    opacity: 1;
    transform: none;
  }
}

@media (max-width: 1080px) {
  #main-nav {
    display: none;
  }

  #main-nav.open {
    display: flex;
    position: absolute;
    top: var(--header-h);
    left: 0;
    right: 0;
    background: var(--surface);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid var(--glass-border);
    box-shadow: var(--shadow-lg);
    padding: 16px 20px;
    animation: fadeSlide 0.3s ease both;
  }

  #main-nav.open ul {
    flex-direction: column;
    align-items: stretch;
    width: 100%;
    gap: 6px;
  }

  #main-nav.open a {
    display: block;
    padding: 12px 16px;
    font-size: 0.95rem;
  }

  #main-nav.open a::after {
    display: none;
  }

  #menu-toggle {
    display: inline-flex;
  }

  #site-search input {
    width: 120px;
  }

  #site-search input:focus {
    width: 150px;
  }
}

@media (max-width: 820px) {
  :root {
    --header-h: 64px;
  }

  .header-inner {
    gap: 12px;
    padding: 0 16px;
  }

  .brand-sub {
    display: none;
  }

  #site-search {
    display: none;
  }

  #banner {
    margin-top: 18px;
    padding: 0 16px;
  }

  .carousel {
    border-radius: var(--radius-lg);
  }

  .slide svg {
    min-height: 220px;
  }

  .slide-caption {
    padding: 24px 22px;
    background: linear-gradient(
      180deg,
      rgba(13, 13, 22, 0.35) 0%,
      rgba(13, 13, 22, 0.82) 100%
    );
    justify-content: flex-end;
    padding-bottom: 52px;
  }

  .carousel-prev,
  .carousel-next {
    width: 38px;
    height: 38px;
    font-size: 1.3rem;
  }

  .carousel-prev {
    left: 10px;
  }

  .carousel-next {
    right: 10px;
  }

  #breadcrumb {
    padding: 0 16px;
    margin-top: 14px;
  }

  main > section:not(#banner):not(#breadcrumb) {
    padding: 40px 16px;
  }

  .lead {
    padding: 20px;
  }

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

  #products article,
  #services article,
  #scenarios article,
  #news article,
  #knowledge article,
  #contact address {
    grid-template-columns: 1fr;
  }

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

  #site-footer {
    padding: 44px 16px 24px;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  #back-to-top {
    right: 14px;
    bottom: 16px;
    width: 44px;
    height: 44px;
  }
}

@media (max-width: 480px) {
  body {
    font-size: 15px;
  }

  .brand-name {
    font-size: 1rem;
  }

  .logo {
    width: 36px;
    height: 36px;
  }

  #theme-toggle,
  #menu-toggle {
    width: 38px;
    height: 38px;
    font-size: 1rem;
  }

  .slide-caption h2 {
    font-size: 1.1rem;
  }

  .slide-caption p {
    font-size: 0.82rem;
  }

  section h2 {
    margin-bottom: 22px;
  }

  .article-card {
    padding: 20px;
  }

  .faq-list summary {
    padding: 15px 48px 15px 18px;
    font-size: 0.92rem;
  }

  .faq-list details p {
    padding: 0 18px 18px;
  }
}