:root {
  --brand-primary: #1a237e;
  --brand-primary-light: #3949ab;
  --brand-primary-lighter: #5c6bc0;
  --brand-accent: #ffd54f;
  --brand-accent-dark: #ffb300;
  --brand-gradient: linear-gradient(135deg, #1a237e 0%, #283593 30%, #3949ab 60%, #5c6bc0 100%);
  --brand-gradient-2: linear-gradient(135deg, #0d47a1 0%, #1565c0 50%, #1e88e5 100%);
  --brand-gradient-3: linear-gradient(135deg, #1b5e20 0%, #2e7d32 50%, #43a047 100%);
  --bg-body: #f5f6fa;
  --bg-card: #ffffff;
  --bg-card-hover: #ffffff;
  --bg-glass: rgba(255, 255, 255, 0.72);
  --bg-glass-border: rgba(255, 255, 255, 0.5);
  --bg-header: rgba(255, 255, 255, 0.82);
  --bg-input: #ffffff;
  --bg-code: #eef0f7;
  --text-primary: #1a1a2e;
  --text-secondary: #4a4a6a;
  --text-tertiary: #7a7a9a;
  --text-inverse: #ffffff;
  --border-color: #e2e4ee;
  --border-light: #eef0f7;
  --shadow-sm: 0 1px 3px rgba(26, 35, 126, 0.06);
  --shadow-md: 0 4px 16px rgba(26, 35, 126, 0.08);
  --shadow-lg: 0 12px 40px rgba(26, 35, 126, 0.12);
  --shadow-xl: 0 20px 60px rgba(26, 35, 126, 0.16);
  --shadow-glass: 0 8px 32px rgba(26, 35, 126, 0.1);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Fira Mono", "Roboto Mono", monospace;
  --transition-fast: 0.2s 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);
  --container-max: 1200px;
  --container-padding: 20px;
  --header-height: 68px;
}

[data-theme="dark"] {
  --brand-primary: #5c6bc0;
  --brand-primary-light: #7986cb;
  --brand-primary-lighter: #9fa8da;
  --brand-accent: #ffd54f;
  --brand-accent-dark: #ffca28;
  --brand-gradient: linear-gradient(135deg, #0d1442 0%, #1a237e 30%, #283593 60%, #3949ab 100%);
  --brand-gradient-2: linear-gradient(135deg, #0a1a3a 0%, #0d47a1 50%, #1565c0 100%);
  --brand-gradient-3: linear-gradient(135deg, #0a2a0a 0%, #1b5e20 50%, #2e7d32 100%);
  --bg-body: #0a0a14;
  --bg-card: #14142a;
  --bg-card-hover: #1a1a35;
  --bg-glass: rgba(20, 20, 42, 0.78);
  --bg-glass-border: rgba(92, 107, 192, 0.2);
  --bg-header: rgba(10, 10, 20, 0.82);
  --bg-input: #1a1a35;
  --bg-code: #1a1a35;
  --text-primary: #e8e8f0;
  --text-secondary: #a8a8c0;
  --text-tertiary: #6a6a8a;
  --text-inverse: #0a0a14;
  --border-color: #2a2a4a;
  --border-light: #1f1f3a;
  --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-xl: 0 20px 60px rgba(0, 0, 0, 0.6);
  --shadow-glass: 0 8px 32px rgba(0, 0, 0, 0.4);
}

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

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

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text-primary);
  background-color: var(--bg-body);
  transition: background-color var(--transition-base), color var(--transition-base);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

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

a:hover {
  color: var(--brand-accent-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-color: var(--brand-accent);
  color: #1a237e;
}

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

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

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

.header-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  white-space: nowrap;
  transition: transform var(--transition-fast);
}

.logo:hover {
  transform: scale(1.03);
  color: var(--text-primary);
}

.logo svg {
  flex-shrink: 0;
  transition: transform var(--transition-slow);
}

.logo:hover svg {
  transform: rotate(72deg);
}

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

#main-nav a {
  display: block;
  padding: 8px 14px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-full);
  transition: color var(--transition-fast), background var(--transition-fast), transform var(--transition-fast);
  position: relative;
}

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

#main-nav a:hover {
  color: var(--brand-primary-light);
  background: rgba(92, 107, 192, 0.08);
  transform: translateY(-1px);
}

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

.header-actions {
  display: flex;
  align-items: center;
  gap: 6px;
}

.header-actions button {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  border-radius: var(--radius-full);
  background: transparent;
  color: var(--text-secondary);
  transition: background var(--transition-fast), transform var(--transition-fast), color var(--transition-fast);
}

.header-actions button:hover {
  background: rgba(92, 107, 192, 0.12);
  color: var(--brand-primary-light);
  transform: scale(1.1);
}

.header-actions button:active {
  transform: scale(0.95);
}

#menu-toggle {
  display: none;
}

#search-bar {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding) 16px;
  animation: slideDown 0.3s ease;
}

#search-bar[hidden] {
  display: none;
}

#search-bar form {
  display: flex;
  gap: 10px;
  max-width: 600px;
  margin: 0 auto;
}

#search-input {
  flex: 1;
  padding: 12px 20px;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-full);
  background: var(--bg-input);
  color: var(--text-primary);
  font-size: 0.95rem;
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

#search-input:focus {
  border-color: var(--brand-primary-light);
  box-shadow: 0 0 0 4px rgba(92, 107, 192, 0.15);
}

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

#search-bar button[type="submit"] {
  padding: 12px 28px;
  background: var(--brand-gradient);
  color: #fff;
  font-weight: 600;
  font-size: 0.95rem;
  border-radius: var(--radius-full);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

#search-bar button[type="submit"]:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

#breadcrumb {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 16px var(--container-padding) 0;
}

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

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

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

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

#breadcrumb li[aria-current="page"] {
  color: var(--text-primary);
  font-weight: 500;
}

main {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding) 80px;
}

section {
  margin-top: 64px;
}

section > h2 {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 20px;
  padding-bottom: 12px;
  position: relative;
  letter-spacing: -0.01em;
}

section > h2::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 56px;
  height: 3px;
  background: var(--brand-gradient);
  border-radius: var(--radius-full);
}

section h3 {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-top: 28px;
  margin-bottom: 10px;
}

section p {
  color: var(--text-secondary);
  margin-bottom: 14px;
  font-size: 0.95rem;
}

#banner {
  margin-top: 24px;
  background: var(--brand-gradient);
  border-radius: var(--radius-xl);
  padding: 48px 40px;
  color: #fff;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

#banner::before {
  content: "";
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(255, 213, 79, 0.15) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

#banner::after {
  content: "";
  position: absolute;
  bottom: -40%;
  left: -10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.08) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

#banner h1 {
  font-size: 2.2rem;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 16px;
  position: relative;
  z-index: 1;
  letter-spacing: -0.02em;
}

.banner-lead {
  font-size: 1rem;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.88);
  max-width: 820px;
  margin-bottom: 32px;
  position: relative;
  z-index: 1;
}

.banner-slides {
  position: relative;
  z-index: 1;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: rgba(0, 0, 0, 0.15);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.12);
}

.slide {
  margin: 0;
  position: relative;
}

.slide[hidden] {
  display: none;
}

.slide svg {
  width: 100%;
  height: auto;
  display: block;
}

.slide figcaption {
  padding: 14px 20px;
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.85);
  background: rgba(0, 0, 0, 0.2);
  text-align: center;
}

.banner-controls {
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  transform: translateY(-50%);
  display: flex;
  justify-content: space-between;
  padding: 0 12px;
  pointer-events: none;
}

.banner-controls button {
  pointer-events: auto;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  color: #fff;
  background: rgba(255, 255, 255, 0.18);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: var(--radius-full);
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.banner-controls button:hover {
  background: rgba(255, 255, 255, 0.35);
  transform: scale(1.1);
}

.banner-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 32px;
  position: relative;
  z-index: 1;
}

.stat {
  text-align: center;
  padding: 20px 12px;
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-md);
  transition: transform var(--transition-base), background var(--transition-base);
}

.stat:hover {
  transform: translateY(-4px);
  background: rgba(255, 255, 255, 0.18);
}

.stat .num {
  display: block;
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--brand-accent);
  line-height: 1.2;
  font-variant-numeric: tabular-nums;
}

.stat span:last-child {
  font-size: 0.82rem;
  color: rgba(255, 255, 255, 0.8);
}

#brand-intro,
#products,
#advantages,
#solutions,
#industry,
#cases,
#news,
#articles,
#faq,
#howto,
#contact,
#sitemap,
#links,
#copyright,
#privacy,
#disclaimer {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-light);
  transition: background var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
}

#products h3,
#advantages h3,
#solutions h3,
#industry h3,
#cases h3,
#articles h3,
#news h3,
#howto h3,
#contact h3 {
  display: flex;
  align-items: center;
  gap: 8px;
}

#products h3::before,
#advantages h3::before,
#solutions h3::before,
#industry h3::before,
#cases h3::before {
  content: "";
  width: 4px;
  height: 20px;
  background: var(--brand-gradient);
  border-radius: var(--radius-full);
  flex-shrink: 0;
}

#news article {
  padding: 20px 0;
  border-bottom: 1px solid var(--border-light);
  transition: transform var(--transition-base), padding var(--transition-base);
}

#news article:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

#news article:hover {
  transform: translateX(6px);
}

#news article h3 {
  font-size: 1.1rem;
  margin-top: 0;
  margin-bottom: 6px;
  color: var(--brand-primary-light);
}

#news time {
  font-size: 0.82rem;
  color: var(--text-tertiary);
  display: inline-block;
  margin-bottom: 8px;
}

#articles article {
  padding: 24px 0;
  border-bottom: 1px solid var(--border-light);
  transition: transform var(--transition-base);
}

#articles article:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

#articles article:hover {
  transform: translateX(6px);
}

#articles article h3 {
  font-size: 1.08rem;
  margin-top: 0;
  margin-bottom: 6px;
  color: var(--brand-primary-light);
}

#articles article p {
  margin-bottom: 8px;
}

#articles article a {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--brand-primary-light);
  padding: 4px 0;
  transition: gap var(--transition-fast), color var(--transition-fast);
}

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

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

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

#cases blockquote {
  margin: 16px 0;
  padding: 20px 24px;
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-left: 4px solid var(--brand-accent);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  box-shadow: var(--shadow-glass);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

#cases blockquote:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow-md);
}

#cases blockquote p {
  margin: 0;
  font-style: italic;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

#faq details {
  margin-bottom: 12px;
  background: var(--bg-body);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: box-shadow var(--transition-base), border-color var(--transition-base), background var(--transition-base);
}

#faq details:hover {
  border-color: var(--brand-primary-lighter);
  box-shadow: var(--shadow-sm);
}

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

#faq summary {
  padding: 16px 20px;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-primary);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  transition: background var(--transition-fast), color var(--transition-fast);
  position: relative;
}

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

#faq summary::after {
  content: "+";
  font-size: 1.3rem;
  font-weight: 400;
  color: var(--brand-primary-light);
  flex-shrink: 0;
  transition: transform var(--transition-base), color var(--transition-base);
  line-height: 1;
}

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

#faq summary:hover {
  background: rgba(92, 107, 192, 0.06);
  color: var(--brand-primary-light);
}

#faq details p {
  padding: 0 20px 18px;
  margin: 0;
  font-size: 0.92rem;
  color: var(--text-secondary);
  animation: fadeInUp 0.3s ease;
}

#howto ol {
  counter-reset: howto-step;
  margin: 20px 0;
  padding: 0;
  list-style: none;
}

#howto ol li {
  counter-increment: howto-step;
  position: relative;
  padding: 14px 16px 14px 56px;
  margin-bottom: 10px;
  background: var(--bg-body);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  font-size: 0.93rem;
  color: var(--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: 14px;
  top: 50%;
  transform: translateY(-50%);
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--brand-gradient);
  color: #fff;
  font-size: 0.82rem;
  font-weight: 700;
  border-radius: var(--radius-full);
}

#howto ol li:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow-sm);
  border-color: var(--brand-primary-lighter);
}

#contact address {
  font-style: normal;
}

#contact address p {
  margin-bottom: 8px;
}

#contact address a {
  font-weight: 500;
}

#sitemap ul,
#links ul {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 10px;
}

#sitemap li,
#links li {
  font-size: 0.92rem;
}

#sitemap a,
#links a {
  display: block;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  background: var(--bg-body);
  border: 1px solid var(--border-light);
  transition: all var(--transition-fast);
}

#sitemap a:hover,
#links a:hover {
  color: var(--brand-primary-light);
  border-color: var(--brand-primary-lighter);
  background: rgba(92, 107, 192, 0.08);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

#links a[target="_blank"]::after {
  content: " ↗";
  font-size: 0.75rem;
  opacity: 0.6;
}

footer {
  background: var(--brand-gradient);
  color: rgba(255, 255, 255, 0.85);
  margin-top: 40px;
  position: relative;
  overflow: hidden;
}

footer::before {
  content: "";
  position: absolute;
  top: -50%;
  right: -10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(255, 213, 79, 0.08) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.footer-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 48px var(--container-padding) 32px;
  position: relative;
  z-index: 1;
  text-align: center;
}

.footer-inner p {
  font-size: 0.85rem;
  margin-bottom: 8px;
  color: rgba(255, 255, 255, 0.75);
}

.footer-inner nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px 20px;
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
}

.footer-inner nav a {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.75);
  transition: color var(--transition-fast), transform var(--transition-fast);
}

.footer-inner nav a:hover {
  color: var(--brand-accent);
  transform: translateY(-2px);
}

#back-to-top {
  position: fixed;
  bottom: 28px;
  right: 28px;
  z-index: 900;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  color: #fff;
  background: var(--brand-gradient);
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-lg);
  transition: transform var(--transition-base), box-shadow var(--transition-base), opacity var(--transition-base);
}

#back-to-top[hidden] {
  display: none;
}

#back-to-top:hover {
  transform: translateY(-4px) scale(1.05);
  box-shadow: var(--shadow-xl);
}

#back-to-top:active {
  transform: translateY(-2px) scale(0.98);
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.reveal {
  opacity: 0;
  transform: translateY(24px);
  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.visible {
  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;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}

@media (max-width: 1024px) {
  #main-nav a {
    padding: 8px 10px;
    font-size: 0.85rem;
  }

  #banner {
    padding: 40px 28px;
  }

  #banner h1 {
    font-size: 1.8rem;
  }

  .banner-stats {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 60px;
    --container-padding: 16px;
  }

  body {
    font-size: 15px;
  }

  .header-inner {
    gap: 10px;
  }

  .logo {
    font-size: 1.1rem;
  }

  .logo svg {
    width: 30px;
    height: 30px;
  }

  #main-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--bg-header);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--border-light);
    box-shadow: var(--shadow-lg);
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-slow), opacity var(--transition-base);
    opacity: 0;
  }

  #main-nav.open {
    max-height: 500px;
    opacity: 1;
    overflow-y: auto;
  }

  #main-nav ul {
    flex-direction: column;
    align-items: stretch;
    padding: 12px 16px;
    gap: 2px;
  }

  #main-nav a {
    padding: 12px 16px;
    font-size: 0.95rem;
    border-radius: var(--radius-sm);
  }

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

  #menu-toggle {
    display: flex;
  }

  .header-actions button {
    width: 36px;
    height: 36px;
    font-size: 1rem;
  }

  #search-bar form {
    flex-direction: column;
  }

  #search-bar button[type="submit"] {
    padding: 12px;
  }

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

  #banner h1 {
    font-size: 1.5rem;
  }

  .banner-lead {
    font-size: 0.92rem;
    margin-bottom: 24px;
  }

  .banner-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
    margin-top: 24px;
  }

  .stat {
    padding: 14px 8px;
  }

  .stat .num {
    font-size: 1.4rem;
  }

  .stat span:last-child {
    font-size: 0.75rem;
  }

  section {
    margin-top: 40px;
  }

  section > h2 {
    font-size: 1.4rem;
  }

  section h3 {
    font-size: 1.08rem;
  }

  #brand-intro,
  #products,
  #advantages,
  #solutions,
  #industry,
  #cases,
  #news,
  #articles,
  #faq,
  #howto,
  #contact,
  #sitemap,
  #links,
  #copyright,
  #privacy,
  #disclaimer {
    padding: 24px 18px;
    border-radius: var(--radius-md);
  }

  .banner-controls button {
    width: 36px;
    height: 36px;
    font-size: 1.3rem;
  }

  #sitemap ul,
  #links ul {
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 8px;
  }

  #sitemap a,
  #links a {
    padding: 8px 12px;
    font-size: 0.85rem;
  }

  #back-to-top {
    bottom: 20px;
    right: 20px;
    width: 42px;
    height: 42px;
    font-size: 1.1rem;
  }

  .footer-inner {
    padding: 36px var(--container-padding) 28px;
  }

  .footer-inner nav {
    gap: 6px 16px;
  }
}

@media (max-width: 480px) {
  :root {
    --container-padding: 14px;
  }

  #banner {
    padding: 28px 16px;
  }

  #banner h1 {
    font-size: 1.3rem;
  }

  .banner-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
  }

  .stat .num {
    font-size: 1.2rem;
  }

  section > h2 {
    font-size: 1.25rem;
  }

  #brand-intro,
  #products,
  #advantages,
  #solutions,
  #industry,
  #cases,
  #news,
  #articles,
  #faq,
  #howto,
  #contact,
  #sitemap,
  #links,
  #copyright,
  #privacy,
  #disclaimer {
    padding: 20px 14px;
  }

  #howto ol li {
    padding: 12px 12px 12px 48px;
    font-size: 0.88rem;
  }

  #howto ol li::before {
    left: 10px;
    width: 24px;
    height: 24px;
    font-size: 0.75rem;
  }

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

  #faq details p {
    padding: 0 16px 16px;
    font-size: 0.88rem;
  }

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

@media print {
  #site-header,
  #back-to-top,
  .banner-controls,
  #search-bar,
  .header-actions {
    display: none !important;
  }

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

  #banner {
    background: #1a237e !important;
    -webkit-print-color-adjust: exact;
    print-color-adjust: exact;
  }

  section {
    page-break-inside: avoid;
  }

  a {
    color: #1a237e;
  }
}