:root {
  --primary: #1a6ee8;
  --primary-dark: #0d3b8f;
  --primary-light: #4f9cf9;
  --accent: #ffd166;
  --bg: #f5f8fd;
  --bg-elevated: #ffffff;
  --text: #14213d;
  --text-muted: #5a6b8c;
  --border: #dbe4f3;
  --glass-bg: rgba(255, 255, 255, 0.65);
  --glass-border: rgba(255, 255, 255, 0.45);
  --shadow-sm: 0 2px 8px rgba(20, 33, 61, 0.06);
  --shadow-md: 0 8px 24px rgba(20, 33, 61, 0.1);
  --shadow-lg: 0 16px 48px rgba(20, 33, 61, 0.16);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-xl: 32px;
  --header-h: 68px;
  --maxw: 1180px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html[data-theme="dark"] {
  --bg: #0b1220;
  --bg-elevated: #141d31;
  --text: #e6edf9;
  --text-muted: #9aaac6;
  --border: #24314d;
  --glass-bg: rgba(20, 29, 49, 0.65);
  --glass-border: rgba(255, 255, 255, 0.08);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.55);
}

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

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

body {
  margin: 0;
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background-color: var(--bg);
  background-image:
    radial-gradient(1200px 600px at 10% -10%, rgba(26, 110, 232, 0.1), transparent 60%),
    radial-gradient(1000px 500px at 100% 0%, rgba(255, 209, 102, 0.08), transparent 55%);
  background-attachment: fixed;
  transition: background-color var(--transition), color var(--transition);
  overflow-x: hidden;
}

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

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

a:hover,
a:focus-visible {
  color: var(--primary-light);
  text-decoration: underline;
}

h1, h2, h3, h4, h5, h6 {
  line-height: 1.35;
  color: var(--text);
  margin: 1.6em 0 0.6em;
  font-weight: 700;
  letter-spacing: 0.01em;
}

h1 {
  font-size: clamp(1.6rem, 3.4vw, 2.4rem);
  background: linear-gradient(100deg, var(--primary) 0%, var(--primary-light) 55%, var(--accent) 130%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  margin-top: 0.4em;
}

h2 {
  font-size: clamp(1.3rem, 2.4vw, 1.75rem);
  padding-left: 14px;
  border-left: 4px solid var(--primary);
  border-radius: 2px;
}

h3 {
  font-size: clamp(1.1rem, 1.8vw, 1.3rem);
  color: var(--primary-dark);
}

html[data-theme="dark"] h3 {
  color: var(--primary-light);
}

h4 {
  font-size: 1.05rem;
}

p {
  margin: 0 0 1em;
  color: var(--text);
}

ul, ol {
  padding-left: 1.4em;
  margin: 0 0 1em;
}

li {
  margin-bottom: 0.35em;
}

blockquote {
  margin: 1.2em 0;
  padding: 16px 20px;
  border-left: 4px solid var(--accent);
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  box-shadow: var(--shadow-sm);
  color: var(--text-muted);
  font-style: italic;
}

blockquote p {
  margin: 0;
  color: inherit;
}

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

code, pre {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

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

::selection {
  background: rgba(26, 110, 232, 0.25);
}

/* ============ Header ============ */
#site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--glass-bg);
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: var(--shadow-sm);
  transition: background var(--transition), box-shadow var(--transition);
}

.header-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 20px;
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

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

.brand-logo {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  box-shadow: 0 4px 14px rgba(26, 110, 232, 0.35);
  transition: transform var(--transition);
}

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

.brand-name {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text);
  white-space: nowrap;
  background: linear-gradient(90deg, var(--primary), var(--primary-light));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

#main-nav {
  flex: 1 1 auto;
}

#main-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

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

#main-nav a:hover,
#main-nav a:focus-visible {
  background: rgba(26, 110, 232, 0.12);
  color: var(--primary);
  text-decoration: none;
  transform: translateY(-1px);
}

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

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

#site-search:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(26, 110, 232, 0.16);
}

#search-input {
  border: none;
  background: transparent;
  padding: 9px 14px;
  font-size: 0.88rem;
  color: var(--text);
  width: 190px;
  min-width: 0;
  outline: none;
}

#search-input::placeholder {
  color: var(--text-muted);
  opacity: 0.8;
}

#site-search button[type="submit"] {
  border: none;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff;
  padding: 9px 16px;
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: filter var(--transition);
}

#site-search button[type="submit"]:hover {
  filter: brightness(1.1);
}

#theme-toggle,
#menu-toggle {
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  color: var(--text);
  border-radius: 999px;
  padding: 9px 16px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: background var(--transition), color var(--transition), transform var(--transition), box-shadow var(--transition);
}

#theme-toggle:hover,
#menu-toggle:hover {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
  transform: translateY(-1px);
  box-shadow: 0 6px 18px rgba(26, 110, 232, 0.3);
}

#menu-toggle {
  display: none;
}

/* ============ Main / Layout ============ */
main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 20px 60px;
}

section {
  margin-bottom: 44px;
}

/* ============ Banner ============ */
#banner {
  position: relative;
  margin: 28px 0 36px;
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  background: linear-gradient(135deg, #0d3b8f 0%, #1a6ee8 55%, #4f9cf9 100%);
  isolation: isolate;
}

#banner::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(600px 300px at 85% 15%, rgba(255, 209, 102, 0.28), transparent 60%),
    radial-gradient(500px 260px at 5% 90%, rgba(255, 255, 255, 0.14), transparent 60%);
  pointer-events: none;
  z-index: 1;
}

.banner-slides {
  position: relative;
  min-height: 380px;
}

.banner-slide {
  position: absolute;
  inset: 0;
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  align-items: center;
  gap: 28px;
  padding: 36px 44px;
  opacity: 0;
  visibility: hidden;
  transform: translateX(24px);
  transition: opacity 0.6s ease, transform 0.6s ease, visibility 0.6s;
  z-index: 2;
}

.banner-slide.is-active {
  opacity: 1;
  visibility: visible;
  transform: translateX(0);
}

.banner-img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.35);
  border: 1px solid rgba(255, 255, 255, 0.18);
  transition: transform 0.6s ease;
}

.banner-slide:hover .banner-img {
  transform: scale(1.02);
}

.banner-text {
  color: #fff;
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: var(--radius-lg);
  padding: 26px 28px;
  box-shadow: var(--shadow-md);
}

.banner-text h2 {
  color: #fff;
  border-left: none;
  padding-left: 0;
  margin: 0 0 12px;
  font-size: clamp(1.25rem, 2.2vw, 1.7rem);
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.25);
}

.banner-text p {
  color: rgba(255, 255, 255, 0.9);
  margin: 0;
  font-size: 0.98rem;
}

.banner-dots {
  position: absolute;
  bottom: 18px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 10px;
  z-index: 5;
}

.banner-dots button {
  width: 34px;
  height: 8px;
  border-radius: 999px;
  border: none;
  background: rgba(255, 255, 255, 0.4);
  cursor: pointer;
  font-size: 0;
  padding: 0;
  transition: background var(--transition), width var(--transition);
}

.banner-dots button.is-active {
  background: var(--accent);
  width: 52px;
}

.banner-dots button:hover {
  background: rgba(255, 255, 255, 0.75);
}

/* ============ Stats ============ */
#stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  margin: 0 0 36px;
}

.stat-item {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 24px 16px;
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  position: relative;
  overflow: hidden;
}

.stat-item::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(26, 110, 232, 0.08), transparent 60%);
  opacity: 0;
  transition: opacity var(--transition);
}

.stat-item:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
  border-color: rgba(26, 110, 232, 0.4);
}

.stat-item:hover::after {
  opacity: 1;
}

.stat-num {
  display: block;
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 800;
  background: linear-gradient(120deg, var(--primary), var(--primary-light), var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1.2;
}

.stat-label {
  display: block;
  margin-top: 6px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ============ Breadcrumb ============ */
#breadcrumb {
  margin-bottom: 24px;
}

#breadcrumb ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 10px 16px;
  margin: 0;
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  border-radius: 999px;
  font-size: 0.85rem;
  box-shadow: var(--shadow-sm);
  width: fit-content;
}

#breadcrumb li {
  margin: 0;
  color: var(--text-muted);
}

#breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--text-muted);
  opacity: 0.6;
}

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

/* ============ Content Sections ============ */
#intro {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 36px clamp(20px, 4vw, 48px);
  box-shadow: var(--shadow-md);
  transition: box-shadow var(--transition), border-color var(--transition);
}

#intro:hover {
  box-shadow: var(--shadow-lg);
}

.lead {
  font-size: 1.05rem;
  color: var(--text-muted);
  padding: 18px 22px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, rgba(26, 110, 232, 0.08), rgba(255, 209, 102, 0.08));
  border: 1px solid rgba(26, 110, 232, 0.18);
  margin-bottom: 1.4em;
}

#products,
#solutions,
#scenarios,
#cases,
#howto,
#news,
#articles,
#faq,
#about,
#contact {
  margin-top: 12px;
}

/* Products cards feel */
#products h3,
#solutions h3,
#scenarios h3,
#cases h3,
#howto h3 {
  background: var(--glass-bg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: 12px 18px;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}

#products h3:hover,
#solutions h3:hover,
#scenarios h3:hover,
#cases h3:hover,
#howto h3:hover {
  transform: translateX(4px);
  box-shadow: var(--shadow-md);
}

#howto h4 {
  color: var(--primary);
  margin-top: 1.2em;
}

/* ============ News / Articles ============ */
#news,
#articles {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

#news article,
#articles article {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 22px 22px 20px;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

#news article::before,
#articles article::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--primary-light), var(--accent));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}

#news article:hover,
#articles article:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
  border-color: rgba(26, 110, 232, 0.35);
}

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

#news article h3,
#articles article h3 {
  margin: 0 0 8px;
  font-size: 1.05rem;
  color: var(--text);
}

#news article p,
#articles article p {
  margin: 0 0 10px;
  font-size: 0.92rem;
  color: var(--text-muted);
}

#articles article a {
  margin-top: auto;
  align-self: flex-start;
  display: inline-block;
  padding: 7px 16px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff;
  font-size: 0.85rem;
  font-weight: 600;
  transition: transform var(--transition), box-shadow var(--transition), filter var(--transition);
}

#articles article a:hover {
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(26, 110, 232, 0.35);
  filter: brightness(1.08);
}

/* ============ FAQ ============ */
#faq details {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 4px 20px;
  margin-bottom: 12px;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), border-color var(--transition), background var(--transition);
}

#faq details:hover {
  border-color: rgba(26, 110, 232, 0.35);
  box-shadow: var(--shadow-md);
}

#faq details[open] {
  background: linear-gradient(180deg, rgba(26, 110, 232, 0.06), transparent 40%), var(--bg-elevated);
  border-color: rgba(26, 110, 232, 0.4);
}

#faq summary {
  cursor: pointer;
  padding: 14px 0;
  font-weight: 600;
  font-size: 0.98rem;
  color: var(--text);
  list-style: none;
  position: relative;
  padding-right: 34px;
  transition: color var(--transition);
}

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

#faq summary::after {
  content: "+";
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 26px;
  height: 26px;
  line-height: 24px;
  text-align: center;
  border-radius: 50%;
  background: rgba(26, 110, 232, 0.12);
  color: var(--primary);
  font-weight: 700;
  transition: transform var(--transition), background var(--transition);
}

#faq details[open] summary::after {
  content: "−";
  transform: translateY(-50%) rotate(180deg);
  background: var(--primary);
  color: #fff;
}

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

#faq details p {
  margin: 0 0 16px;
  color: var(--text-muted);
  font-size: 0.94rem;
  animation: fadeInUp 0.35s ease both;
}

/* ============ Contact / About ============ */
#contact address {
  font-style: normal;
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 24px 26px;
  box-shadow: var(--shadow-sm);
  display: grid;
  gap: 6px;
}

#contact address p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.94rem;
}

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

#about h3 {
  border-left-color: var(--accent);
}

/* ============ Sitemap / Friend links ============ */
#sitemap ul,
#friend-links ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

#sitemap li,
#friend-links li {
  margin: 0;
}

#sitemap a,
#friend-links a {
  display: inline-block;
  padding: 8px 16px;
  font-size: 0.88rem;
  border-radius: 999px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--text-muted);
  transition: all var(--transition);
}

#sitemap a:hover,
#friend-links a:hover {
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border-color: transparent;
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(26, 110, 232, 0.3);
}

/* ============ Footer ============ */
#site-footer {
  background: linear-gradient(160deg, #0d1a33 0%, #0a1226 100%);
  color: rgba(230, 237, 249, 0.78);
  padding: 40px 20px 32px;
  margin-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.footer-info {
  max-width: var(--maxw);
  margin: 0 auto;
  display: grid;
  gap: 8px;
}

.footer-info p {
  margin: 0;
  font-size: 0.85rem;
  color: rgba(230, 237, 249, 0.68);
  line-height: 1.7;
}

.footer-info p:last-child {
  margin-top: 12px;
  padding-top: 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  color: rgba(230, 237, 249, 0.5);
  text-align: center;
}

.footer-info time {
  color: var(--accent);
  font-size: inherit;
}

/* ============ Back to top ============ */
#back-to-top {
  position: fixed;
  right: 22px;
  bottom: 22px;
  z-index: 90;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  color: var(--primary);
  font-size: 0;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  transition: transform var(--transition), background var(--transition), color var(--transition), opacity var(--transition);
  opacity: 0;
  pointer-events: none;
}

#back-to-top::before {
  content: "↑";
  font-size: 1.3rem;
  font-weight: 700;
  line-height: 52px;
  display: block;
}

#back-to-top.is-visible {
  opacity: 1;
  pointer-events: auto;
}

#back-to-top:hover {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff;
  transform: translateY(-4px) scale(1.05);
}

/* ============ Scroll animations ============ */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s ease, transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
  will-change: opacity, transform;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  .reveal {
    opacity: 1;
    transform: none;
  }
}

/* ============ Responsive ============ */
@media (max-width: 1024px) {
  .header-inner {
    gap: 14px;
  }
  #main-nav a {
    padding: 7px 9px;
    font-size: 0.85rem;
  }
  #search-input {
    width: 150px;
  }
  .banner-slide {
    grid-template-columns: 1fr;
    padding: 28px 26px 60px;
    text-align: center;
  }
  .banner-text {
    padding: 20px 22px;
  }
  .banner-slides {
    min-height: 560px;
  }
  #stats {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  :root {
    --header-h: 60px;
  }
  .header-inner {
    padding: 10px 16px;
    min-height: var(--header-h);
  }
  .brand-name {
    font-size: 0.95rem;
  }
  #menu-toggle {
    display: inline-block;
  }
  #main-nav {
    order: 4;
    flex-basis: 100%;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease;
  }
  #main-nav.is-open {
    max-height: 520px;
    overflow-y: auto;
  }
  #main-nav ul {
    flex-direction: column;
    gap: 2px;
    padding: 8px 0 4px;
  }
  #main-nav a {
    display: block;
    padding: 10px 14px;
    font-size: 0.92rem;
  }
  .header-tools {
    margin-left: auto;
  }
  #site-search {
    display: none;
  }
  #theme-toggle,
  #menu-toggle {
    padding: 8px 12px;
    font-size: 0.8rem;
  }
  main {
    padding: 0 14px 40px;
  }
  #banner {
    margin: 18px 0 26px;
    border-radius: var(--radius-lg);
  }
  .banner-slides {
    min-height: 520px;
  }
  .banner-slide {
    padding: 20px 16px 56px;
    gap: 18px;
  }
  .banner-text {
    padding: 16px 18px;
  }
  .banner-text h2 {
    font-size: 1.15rem;
  }
  .banner-text p {
    font-size: 0.88rem;
  }
  .banner-dots {
    bottom: 14px;
  }
  #stats {
    gap: 12px;
    margin-bottom: 26px;
  }
  .stat-item {
    padding: 18px 10px;
    border-radius: var(--radius-md);
  }
  .stat-num {
    font-size: 1.5rem;
  }
  .stat-label {
    font-size: 0.78rem;
  }
  #breadcrumb ol {
    font-size: 0.8rem;
    padding: 8px 14px;
  }
  #intro {
    padding: 22px 16px;
    border-radius: var(--radius-lg);
  }
  .lead {
    padding: 14px 16px;
    font-size: 0.95rem;
  }
  h2 {
    padding-left: 10px;
    border-left-width: 3px;
  }
  #news,
  #articles {
    grid-template-columns: 1fr;
    gap: 14px;
  }
  #news article,
  #articles article {
    padding: 18px;
  }
  #products h3,
  #solutions h3,
  #scenarios h3,
  #cases h3,
  #howto h3 {
    padding: 10px 14px;
  }
  #faq details {
    padding: 2px 16px;
  }
  #faq summary {
    font-size: 0.92rem;
  }
  #contact address {
    padding: 18px;
  }
  #sitemap a,
  #friend-links a {
    padding: 7px 13px;
    font-size: 0.82rem;
  }
  #site-footer {
    padding: 28px 16px 24px;
  }
  .footer-info p {
    font-size: 0.8rem;
  }
  #back-to-top {
    width: 46px;
    height: 46px;
    right: 14px;
    bottom: 14px;
  }
  #back-to-top::before {
    line-height: 46px;
    font-size: 1.15rem;
  }
}

@media (max-width: 480px) {
  .brand-name {
    max-width: 120px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }
  .banner-slides {
    min-height: 480px;
  }
  #stats {
    grid-template-columns: 1fr 1fr;
  }
  .stat-num {
    font-size: 1.35rem;
  }
}

@media print {
  #site-header,
  #banner,
  #back-to-top,
  .banner-dots,
  #site-search,
  #theme-toggle,
  #menu-toggle {
    display: none !important;
  }
  body {
    background: #fff;
    color: #000;
  }
  main {
    max-width: 100%;
    padding: 0;
  }
  a {
    color: #000;
    text-decoration: underline;
  }
  #intro,
  #news article,
  #articles article,
  #faq details {
    box-shadow: none;
    border: 1px solid #ccc;
  }
}