:root {
  --brand: #ff5a36;
  --brand-dark: #e8441f;
  --brand-light: #fff1ec;
  --accent: #4a7cff;
  --accent-light: #eef5ff;
  --green: #34c759;
  --green-light: #f0fff4;
  --orange: #ffb347;
  --bg: #f7f8fc;
  --bg-elevated: #ffffff;
  --bg-glass: rgba(255, 255, 255, 0.72);
  --bg-glass-border: rgba(255, 255, 255, 0.5);
  --text-primary: #1a1d26;
  --text-secondary: #5a6072;
  --text-muted: #8b90a0;
  --border: rgba(0, 0, 0, 0.08);
  --border-strong: rgba(0, 0, 0, 0.14);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08), 0 2px 6px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.12), 0 4px 12px rgba(0, 0, 0, 0.06);
  --shadow-brand: 0 8px 28px rgba(255, 90, 54, 0.28);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-pill: 999px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --max-width: 1200px;
  --header-height: 68px;
  --transition-fast: 0.18s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

@media (prefers-color-scheme: dark) {
  :root {
    --brand: #ff6b4a;
    --brand-dark: #ff8468;
    --brand-light: #2a1a15;
    --accent: #6b96ff;
    --accent-light: #141c2e;
    --green: #4cd964;
    --green-light: #12261a;
    --orange: #ffc266;
    --bg: #0f1117;
    --bg-elevated: #181b24;
    --bg-glass: rgba(24, 27, 36, 0.78);
    --bg-glass-border: rgba(255, 255, 255, 0.08);
    --text-primary: #eef0f6;
    --text-secondary: #a8adbe;
    --text-muted: #6d7285;
    --border: rgba(255, 255, 255, 0.08);
    --border-strong: rgba(255, 255, 255, 0.14);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.5);
    --shadow-brand: 0 8px 28px rgba(255, 107, 74, 0.3);
  }
}

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

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg);
  color: var(--text-primary);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  transition: background-color var(--transition-base), color var(--transition-base);
}

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

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

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

ul,
ol {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

input,
textarea,
select {
  font-family: inherit;
  font-size: inherit;
}

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

/* ============ Header ============ */
#site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--bg-glass);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--bg-glass-border);
  transition: background-color var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

#site-header.is-scrolled {
  box-shadow: var(--shadow-md);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: var(--header-height);
  display: flex;
  align-items: center;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  transition: transform var(--transition-fast);
}

.brand:hover {
  transform: scale(1.03);
}

.brand svg {
  border-radius: 10px;
  box-shadow: var(--shadow-brand);
  transition: box-shadow var(--transition-base);
}

.brand:hover svg {
  box-shadow: 0 10px 32px rgba(255, 90, 54, 0.4);
}

.brand-name {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--brand), var(--orange));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  white-space: nowrap;
}

#site-header nav {
  flex: 1;
  min-width: 0;
}

#site-header nav ul {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-wrap: nowrap;
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

#site-header nav ul::-webkit-scrollbar {
  display: none;
}

#site-header nav a {
  display: block;
  padding: 8px 12px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-pill);
  white-space: nowrap;
  position: relative;
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

#site-header nav a::after {
  content: "";
  position: absolute;
  bottom: 2px;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--brand);
  border-radius: 2px;
  transform: translateX(-50%);
  transition: width var(--transition-base);
}

#site-header nav a:hover {
  color: var(--brand);
  background: var(--brand-light);
}

#site-header nav a:hover::after {
  width: 60%;
}

#site-header form[role="search"] {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

#site-header form[role="search"] label {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
}

#site-header form[role="search"] input {
  width: 180px;
  padding: 8px 14px;
  font-size: 0.875rem;
  color: var(--text-primary);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  outline: none;
  transition: width var(--transition-base), border-color var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-base);
}

#site-header form[role="search"] input::placeholder {
  color: var(--text-muted);
}

#site-header form[role="search"] input:focus {
  width: 220px;
  border-color: var(--brand);
  box-shadow: 0 0 0 3px rgba(255, 90, 54, 0.15);
}

#site-header form[role="search"] button {
  padding: 8px 18px;
  font-size: 0.875rem;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(135deg, var(--brand), var(--brand-dark));
  border-radius: var(--radius-pill);
  box-shadow: var(--shadow-brand);
  transition: transform var(--transition-fast), box-shadow var(--transition-base), filter var(--transition-fast);
}

#site-header form[role="search"] button:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 28px rgba(255, 90, 54, 0.4);
  filter: brightness(1.05);
}

#site-header form[role="search"] button:active {
  transform: translateY(0);
}

/* ============ Breadcrumb ============ */
body > nav[aria-label="面包屑导航"] {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 16px 24px 0;
}

body > nav[aria-label="面包屑导航"] ol {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8125rem;
  color: var(--text-muted);
}

body > nav[aria-label="面包屑导航"] li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--text-muted);
  opacity: 0.5;
}

body > nav[aria-label="面包屑导航"] a {
  color: var(--text-secondary);
}

body > nav[aria-label="面包屑导航"] a:hover {
  color: var(--brand);
}

body > nav[aria-label="面包屑导航"] li[aria-current="page"] {
  color: var(--text-primary);
  font-weight: 500;
}

/* ============ Main Layout ============ */
main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px 80px;
}

main > section {
  margin-top: 72px;
  scroll-margin-top: calc(var(--header-height) + 24px);
}

main > section:first-of-type {
  margin-top: 32px;
}

/* ============ Typography ============ */
h1 {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--brand) 120%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

h2 {
  font-size: clamp(1.375rem, 2.5vw, 1.875rem);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.02em;
  margin-bottom: 24px;
  position: relative;
  padding-left: 18px;
}

h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.15em;
  bottom: 0.15em;
  width: 5px;
  border-radius: 3px;
  background: linear-gradient(180deg, var(--brand), var(--orange));
}

h3 {
  font-size: 1.125rem;
  font-weight: 700;
  line-height: 1.4;
  margin-top: 28px;
  margin-bottom: 10px;
  color: var(--text-primary);
}

h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-top: 20px;
  margin-bottom: 6px;
  color: var(--brand);
}

p {
  color: var(--text-secondary);
  margin-bottom: 12px;
}

p:last-child {
  margin-bottom: 0;
}

time {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

blockquote {
  position: relative;
  margin: 16px 0;
  padding: 18px 22px 18px 52px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-left: 4px solid var(--brand);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

blockquote::before {
  content: "\201C";
  position: absolute;
  left: 16px;
  top: 8px;
  font-size: 2.5rem;
  line-height: 1;
  font-family: Georgia, serif;
  color: var(--brand);
  opacity: 0.35;
}

blockquote:hover {
  transform: translateX(4px);
  box-shadow: var(--shadow-md);
}

blockquote p {
  color: var(--text-secondary);
  font-style: italic;
  margin: 0;
}

/* ============ Hero Section ============ */
#hero {
  position: relative;
  padding: 56px 40px;
  border-radius: var(--radius-xl);
  background: linear-gradient(135deg, rgba(255, 90, 54, 0.12) 0%, rgba(255, 179, 71, 0.08) 40%, rgba(74, 124, 255, 0.1) 100%);
  border: 1px solid var(--border);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

#hero::before {
  content: "";
  position: absolute;
  top: -50%;
  right: -20%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(255, 90, 54, 0.18) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
  animation: floatOrb 12s ease-in-out infinite;
}

#hero::after {
  content: "";
  position: absolute;
  bottom: -40%;
  left: -10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(74, 124, 255, 0.14) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
  animation: floatOrb 15s ease-in-out infinite reverse;
}

@keyframes floatOrb {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(30px, -30px) scale(1.08); }
}

#hero > * {
  position: relative;
  z-index: 1;
}

#hero > p {
  max-width: 780px;
  font-size: 1.0625rem;
  line-height: 1.8;
}

/* ============ Banner Carousel ============ */
.banner-carousel {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
  margin: 36px 0;
}

.banner-carousel article {
  background: var(--bg-glass);
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-lg);
  padding: 20px;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
  overflow: hidden;
}

.banner-carousel article:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--brand);
}

.banner-carousel article svg {
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  margin-bottom: 16px;
  transition: transform var(--transition-slow);
}

.banner-carousel article:hover svg {
  transform: scale(1.04);
}

.banner-carousel article h3 {
  margin-top: 0;
  margin-bottom: 8px;
  font-size: 1.125rem;
}

.banner-carousel article p {
  font-size: 0.9375rem;
  line-height: 1.65;
}

/* ============ Stats (dl) ============ */
#hero dl {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 16px;
  margin-top: 36px;
}

#hero dl > div {
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-md);
  padding: 20px 16px;
  text-align: center;
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

#hero dl > div:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--brand);
}

#hero dt {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-bottom: 6px;
  font-weight: 500;
}

#hero dd {
  font-size: 1.625rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--brand), var(--orange));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1.2;
}

/* ============ Sections General ============ */
#intro,
#products,
#solutions,
#cases,
#news,
#articles,
#howto,
#faq,
#contact,
#sitemap {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-base), border-color var(--transition-base);
}

#intro:hover,
#products:hover,
#solutions:hover,
#cases:hover,
#news:hover,
#articles:hover,
#howto:hover,
#faq:hover,
#contact:hover,
#sitemap:hover {
  box-shadow: var(--shadow-md);
}

/* ============ Products ============ */
#products h4 {
  padding-left: 14px;
  position: relative;
}

#products h4::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.5em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--brand);
}

/* ============ News & Articles ============ */
#news article,
#articles article {
  padding: 18px 20px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  margin-bottom: 14px;
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base), background-color var(--transition-base);
}

#news article:last-child,
#articles article:last-child {
  margin-bottom: 0;
}

#news article:hover,
#articles article:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--brand);
}

#news article h3,
#articles article h3 {
  margin-top: 0;
  margin-bottom: 4px;
  font-size: 1.0625rem;
}

#news article p,
#articles article p {
  font-size: 0.9375rem;
  margin-bottom: 8px;
}

#articles article a {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--brand);
  transition: gap var(--transition-fast), color var(--transition-fast);
}

#articles article a::after {
  content: "\2192";
  transition: transform var(--transition-fast);
}

#articles article a:hover {
  gap: 8px;
  color: var(--brand-dark);
}

#articles article a:hover::after {
  transform: translateX(3px);
}

/* ============ HowTo ============ */
#howto ol {
  counter-reset: howto;
  margin: 16px 0;
}

#howto ol li {
  counter-increment: howto;
  position: relative;
  padding: 12px 16px 12px 52px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  margin-bottom: 10px;
  color: var(--text-secondary);
  transition: transform var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
}

#howto ol li::before {
  content: counter(howto);
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8125rem;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(135deg, var(--brand), var(--brand-dark));
  border-radius: 50%;
  box-shadow: var(--shadow-brand);
}

#howto ol li:hover {
  transform: translateX(4px);
  border-color: var(--brand);
  box-shadow: var(--shadow-sm);
}

/* ============ FAQ ============ */
#faq details {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  margin-bottom: 10px;
  overflow: hidden;
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

#faq details:last-child {
  margin-bottom: 0;
}

#faq details[open] {
  border-color: var(--brand);
  box-shadow: var(--shadow-sm);
}

#faq summary {
  padding: 16px 20px;
  font-weight: 600;
  font-size: 0.9375rem;
  color: var(--text-primary);
  cursor: pointer;
  list-style: none;
  position: relative;
  padding-right: 48px;
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

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

#faq summary::after {
  content: "+";
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.25rem;
  font-weight: 400;
  color: var(--brand);
  transition: transform var(--transition-base);
  line-height: 1;
}

#faq details[open] summary::after {
  transform: translateY(-50%) rotate(45deg);
}

#faq summary:hover {
  color: var(--brand);
  background: var(--brand-light);
}

#faq details p {
  padding: 0 20px 18px;
  font-size: 0.9375rem;
  line-height: 1.75;
  animation: fadeSlideIn 0.3s ease-out;
}

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

/* ============ Contact ============ */
#contact p {
  padding-left: 0;
}

#contact h3 {
  margin-top: 24px;
}

#contact h3:first-of-type {
  margin-top: 0;
}

/* ============ Sitemap ============ */
#sitemap ul {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 10px;
}

#sitemap a {
  display: block;
  padding: 10px 16px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  text-align: center;
  transition: all var(--transition-fast);
}

#sitemap a:hover {
  color: #fff;
  background: linear-gradient(135deg, var(--brand), var(--brand-dark));
  border-color: transparent;
  transform: translateY(-2px);
  box-shadow: var(--shadow-brand);
}

/* ============ Footer ============ */
footer {
  background: var(--bg-elevated);
  border-top: 1px solid var(--border);
  padding: 48px 24px 32px;
  margin-top: 40px;
}

footer > section {
  max-width: var(--max-width);
  margin: 0 auto 32px;
}

footer h2 {
  font-size: 1rem;
  font-weight: 700;
  padding-left: 0;
  margin-bottom: 14px;
  color: var(--text-primary);
}

footer h2::before {
  display: none;
}

footer h3 {
  font-size: 0.875rem;
  font-weight: 600;
  margin-top: 16px;
  margin-bottom: 6px;
  color: var(--text-secondary);
}

footer p {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.7;
}

footer ul {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

footer ul a {
  display: inline-block;
  padding: 6px 14px;
  font-size: 0.8125rem;
  color: var(--text-secondary);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  transition: all var(--transition-fast);
}

footer ul a:hover {
  color: var(--brand);
  border-color: var(--brand);
  background: var(--brand-light);
  transform: translateY(-2px);
}

footer > p {
  max-width: var(--max-width);
  margin: 0 auto;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  text-align: center;
  font-size: 0.8125rem;
  color: var(--text-muted);
}

/* ============ Back to Top ============ */
#back-to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 900;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0;
  color: #fff;
  background: linear-gradient(135deg, var(--brand), var(--brand-dark));
  border-radius: 50%;
  box-shadow: var(--shadow-brand);
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px) scale(0.9);
  transition: opacity var(--transition-base), transform var(--transition-base), visibility var(--transition-base), box-shadow var(--transition-base);
}

#back-to-top::before {
  content: "\2191";
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1;
}

#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 12px 36px rgba(255, 90, 54, 0.45);
}

#back-to-top:active {
  transform: translateY(-2px) scale(1.02);
}

/* ============ Scroll Animations ============ */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s cubic-bezier(0.4, 0, 0.2, 1), transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
  will-change: opacity, transform;
}

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

main > section {
  animation: sectionFadeIn 0.6s ease-out both;
}

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

@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;
  }
}

/* ============ Responsive: Tablet ============ */
@media (max-width: 1024px) {
  .header-inner {
    gap: 16px;
    padding: 0 20px;
  }

  #site-header nav ul {
    gap: 2px;
  }

  #site-header nav a {
    padding: 8px 10px;
    font-size: 0.8125rem;
  }

  #site-header form[role="search"] input {
    width: 140px;
  }

  #site-header form[role="search"] input:focus {
    width: 170px;
  }

  main {
    padding: 0 20px 64px;
  }

  main > section {
    margin-top: 56px;
  }

  #hero {
    padding: 44px 28px;
  }
}

/* ============ Responsive: Mobile ============ */
@media (max-width: 768px) {
  :root {
    --header-height: 60px;
  }

  body {
    font-size: 15px;
  }

  .header-inner {
    flex-wrap: wrap;
    height: auto;
    padding: 10px 16px;
    gap: 10px;
  }

  .brand {
    order: 1;
  }

  .brand svg {
    width: 34px;
    height: 34px;
  }

  .brand-name {
    font-size: 1.125rem;
  }

  #site-header form[role="search"] {
    order: 2;
    flex: 1;
    min-width: 0;
  }

  #site-header form[role="search"] input {
    width: 100%;
    min-width: 0;
  }

  #site-header form[role="search"] input:focus {
    width: 100%;
  }

  #site-header form[role="search"] button {
    padding: 8px 14px;
    font-size: 0.8125rem;
  }

  #site-header nav {
    order: 3;
    flex-basis: 100%;
    width: 100%;
  }

  #site-header nav ul {
    gap: 0;
    padding-bottom: 4px;
  }

  #site-header nav a {
    padding: 7px 10px;
    font-size: 0.8125rem;
  }

  body > nav[aria-label="面包屑导航"] {
    padding: 12px 16px 0;
  }

  main {
    padding: 0 16px 56px;
  }

  main > section {
    margin-top: 40px;
    scroll-margin-top: calc(var(--header-height) + 80px);
  }

  main > section:first-of-type {
    margin-top: 20px;
  }

  h2 {
    font-size: 1.25rem;
    padding-left: 14px;
    margin-bottom: 18px;
  }

  h2::before {
    width: 4px;
  }

  #hero {
    padding: 32px 20px;
    border-radius: var(--radius-lg);
  }

  #hero > p {
    font-size: 0.9375rem;
  }

  .banner-carousel {
    grid-template-columns: 1fr;
    gap: 16px;
    margin: 24px 0;
  }

  .banner-carousel article {
    padding: 16px;
  }

  #hero dl {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    margin-top: 24px;
  }

  #hero dl > div {
    padding: 16px 12px;
  }

  #hero dd {
    font-size: 1.375rem;
  }

  #intro,
  #products,
  #solutions,
  #cases,
  #news,
  #articles,
  #howto,
  #faq,
  #contact,
  #sitemap {
    padding: 24px 20px;
    border-radius: var(--radius-md);
  }

  #news article,
  #articles article {
    padding: 14px 16px;
  }

  #howto ol li {
    padding: 12px 14px 12px 46px;
  }

  #faq summary {
    padding: 14px 16px;
    padding-right: 44px;
    font-size: 0.9rem;
  }

  #faq details p {
    padding: 0 16px 16px;
  }

  #sitemap ul {
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
  }

  #sitemap a {
    padding: 9px 10px;
    font-size: 0.8125rem;
  }

  footer {
    padding: 36px 16px 24px;
  }

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

/* ============ Responsive: Small Mobile ============ */
@media (max-width: 400px) {
  #hero dl {
    grid-template-columns: 1fr;
  }

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

  .banner-carousel article h3 {
    font-size: 1rem;
  }
}

/* ============ Print ============ */
@media print {
  #site-header,
  #back-to-top,
  footer,
  body > nav[aria-label="面包屑导航"] {
    display: none;
  }

  body {
    background: #fff;
    color: #000;
  }

  main {
    max-width: 100%;
    padding: 0;
  }

  main > section {
    box-shadow: none;
    border: 1px solid #ddd;
    page-break-inside: avoid;
    margin-top: 24px;
  }

  #hero {
    background: #fff;
  }

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