:root {
  --brand-red: #c8102e;
  --brand-red-dark: #a00d24;
  --brand-red-light: #e63950;
  --brand-gold: #ffd166;
  --brand-gold-dark: #f0b429;
  --bg-body: #f7f5f2;
  --bg-card: #ffffff;
  --bg-elevated: #ffffff;
  --bg-glass: rgba(255, 255, 255, 0.72);
  --bg-glass-strong: rgba(255, 255, 255, 0.88);
  --bg-subtle: #f0ece6;
  --text-primary: #1b1b1f;
  --text-secondary: #4a4a55;
  --text-muted: #7c7c88;
  --text-inverse: #ffffff;
  --border-color: #e4ddd3;
  --border-strong: #d0c6b8;
  --shadow-sm: 0 1px 3px rgba(27, 27, 31, 0.06);
  --shadow-md: 0 4px 16px rgba(27, 27, 31, 0.08);
  --shadow-lg: 0 12px 32px rgba(27, 27, 31, 0.12);
  --shadow-xl: 0 20px 48px rgba(27, 27, 31, 0.16);
  --shadow-brand: 0 8px 24px rgba(200, 16, 46, 0.24);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 999px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Consolas", "Monaco", monospace;
  --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);
  --header-height: 68px;
  --max-width: 1240px;
}

[data-theme="dark"] {
  --bg-body: #0e0e12;
  --bg-card: #1a1a22;
  --bg-elevated: #22222c;
  --bg-glass: rgba(26, 26, 34, 0.78);
  --bg-glass-strong: rgba(26, 26, 34, 0.92);
  --bg-subtle: #16161d;
  --text-primary: #f2f0ed;
  --text-secondary: #b8b6c0;
  --text-muted: #7e7c88;
  --text-inverse: #0e0e12;
  --border-color: #2e2e3a;
  --border-strong: #3e3e4c;
  --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 32px rgba(0, 0, 0, 0.5);
  --shadow-xl: 0 20px 48px rgba(0, 0, 0, 0.6);
  --shadow-brand: 0 8px 24px rgba(200, 16, 46, 0.35);
}

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

html {
  scroll-behavior: smooth;
  -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);
  background-image:
    radial-gradient(circle at 12% 8%, rgba(200, 16, 46, 0.06) 0%, transparent 45%),
    radial-gradient(circle at 88% 92%, rgba(255, 209, 102, 0.08) 0%, transparent 45%);
  background-attachment: fixed;
  transition: background-color var(--transition-base), color var(--transition-base);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

a:focus-visible,
button:focus-visible,
input:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--brand-red);
  outline-offset: 2px;
  border-radius: 4px;
}

ul,
ol {
  list-style: none;
}

.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;
  width: 100%;
  background: var(--bg-glass-strong);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border-color);
  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(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: var(--header-height);
  display: flex;
  align-items: center;
  gap: 24px;
}

.logo-area {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
  cursor: pointer;
  transition: transform var(--transition-base);
}

.logo-area:hover {
  transform: scale(1.03);
}

.logo-area svg {
  border-radius: 9px;
  box-shadow: var(--shadow-brand);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.logo-area:hover svg {
  transform: rotate(-6deg) scale(1.08);
  box-shadow: 0 12px 32px rgba(200, 16, 46, 0.4);
}

.site-name {
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  background: linear-gradient(120deg, var(--brand-red) 0%, var(--brand-red-light) 50%, var(--brand-gold-dark) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  white-space: nowrap;
}

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

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

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

#main-nav a {
  display: block;
  padding: 8px 12px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-full);
  white-space: nowrap;
  position: relative;
  transition: color var(--transition-fast), background var(--transition-fast);
}

#main-nav a::after {
  content: "";
  position: absolute;
  bottom: 2px;
  left: 50%;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--brand-red), var(--brand-gold));
  border-radius: 2px;
  transform: translateX(-50%);
  transition: width var(--transition-base);
}

#main-nav a:hover {
  color: var(--brand-red);
  background: rgba(200, 16, 46, 0.07);
}

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

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

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

#site-search:focus-within {
  border-color: var(--brand-red);
  box-shadow: 0 0 0 3px rgba(200, 16, 46, 0.12);
  background: var(--bg-card);
}

#search-input {
  width: 180px;
  padding: 8px 14px;
  font-size: 0.85rem;
  font-family: inherit;
  color: var(--text-primary);
  background: transparent;
  border: none;
  outline: none;
  transition: width var(--transition-base);
}

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

#search-input:focus {
  width: 220px;
}

#site-search button {
  padding: 8px 16px;
  font-size: 0.85rem;
  font-weight: 600;
  font-family: inherit;
  color: var(--text-inverse);
  background: linear-gradient(135deg, var(--brand-red), var(--brand-red-dark));
  border: none;
  cursor: pointer;
  transition: background var(--transition-fast), transform var(--transition-fast);
}

#site-search button:hover {
  background: linear-gradient(135deg, var(--brand-red-light), var(--brand-red));
}

#site-search button:active {
  transform: scale(0.96);
}

#theme-toggle,
#menu-toggle {
  padding: 8px 14px;
  font-size: 0.85rem;
  font-weight: 600;
  font-family: inherit;
  color: var(--text-secondary);
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

#theme-toggle:hover,
#menu-toggle:hover {
  color: var(--brand-red);
  border-color: var(--brand-red);
  background: rgba(200, 16, 46, 0.07);
  transform: translateY(-1px);
}

#menu-toggle {
  display: none;
}

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px 64px;
}

.breadcrumb {
  padding: 20px 0 8px;
}

.breadcrumb ol {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.breadcrumb li {
  display: flex;
  align-items: center;
  gap: 6px;
}

.breadcrumb li:not(:last-child)::after {
  content: "/";
  color: var(--border-strong);
  font-size: 0.75rem;
}

.breadcrumb a {
  color: var(--text-secondary);
  padding: 2px 4px;
  border-radius: 4px;
  transition: color var(--transition-fast), background var(--transition-fast);
}

.breadcrumb a:hover {
  color: var(--brand-red);
  background: rgba(200, 16, 46, 0.07);
}

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

section {
  margin-bottom: 56px;
  scroll-margin-top: calc(var(--header-height) + 16px);
}

section h2 {
  font-size: 1.6rem;
  font-weight: 800;
  line-height: 1.35;
  margin-bottom: 20px;
  padding-left: 16px;
  position: relative;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

section h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.18em;
  bottom: 0.18em;
  width: 5px;
  border-radius: var(--radius-full);
  background: linear-gradient(180deg, var(--brand-red), var(--brand-gold));
  box-shadow: 0 0 12px rgba(200, 16, 46, 0.35);
}

section h3 {
  font-size: 1.18rem;
  font-weight: 700;
  line-height: 1.45;
  margin: 28px 0 12px;
  color: var(--text-primary);
}

section h4 {
  font-size: 1.02rem;
  font-weight: 600;
  margin: 20px 0 8px;
  color: var(--brand-red);
}

section p {
  margin-bottom: 14px;
  color: var(--text-secondary);
  line-height: 1.85;
}

section ul,
section ol {
  margin: 0 0 16px;
  padding-left: 0;
}

section ul li,
section ol li {
  position: relative;
  padding-left: 26px;
  margin-bottom: 10px;
  color: var(--text-secondary);
  line-height: 1.8;
}

section ul li::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 0.72em;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--brand-red), var(--brand-gold));
  box-shadow: 0 0 8px rgba(200, 16, 46, 0.3);
}

section ol {
  counter-reset: item;
}

section ol li {
  counter-increment: item;
  padding-left: 34px;
}

section ol li::before {
  content: counter(item);
  position: absolute;
  left: 0;
  top: 0.3em;
  width: 22px;
  height: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--text-inverse);
  background: linear-gradient(135deg, var(--brand-red), var(--brand-red-dark));
  border-radius: 50%;
  box-shadow: 0 2px 8px rgba(200, 16, 46, 0.3);
}

#hero {
  position: relative;
  padding: 40px 36px 36px;
  margin-bottom: 56px;
  border-radius: var(--radius-xl);
  background: linear-gradient(135deg, #c8102e 0%, #8f0a20 40%, #1b1b1f 100%);
  background-size: 200% 200%;
  animation: heroGradient 12s ease infinite;
  box-shadow: var(--shadow-xl);
  overflow: hidden;
}

#hero::before {
  content: "";
  position: absolute;
  top: -60%;
  right: -20%;
  width: 520px;
  height: 520px;
  background: radial-gradient(circle, rgba(255, 209, 102, 0.28) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
  animation: floatOrb 9s ease-in-out infinite;
}

#hero::after {
  content: "";
  position: absolute;
  bottom: -50%;
  left: -15%;
  width: 420px;
  height: 420px;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.12) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
  animation: floatOrb 11s ease-in-out infinite reverse;
}

@keyframes heroGradient {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

@keyframes floatOrb {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(-24px, 24px) scale(1.08); }
}

#hero-title {
  position: relative;
  z-index: 2;
  font-size: 2.1rem;
  font-weight: 800;
  line-height: 1.3;
  color: #ffffff;
  margin-bottom: 18px;
  letter-spacing: -0.02em;
  text-shadow: 0 2px 20px rgba(0, 0, 0, 0.35);
  background: linear-gradient(120deg, #ffffff 0%, #ffe9b0 60%, #ffd166 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-lead {
  position: relative;
  z-index: 2;
  max-width: 860px;
  font-size: 1rem;
  line-height: 1.9;
  color: rgba(255, 255, 255, 0.92);
  margin-bottom: 28px;
  text-shadow: 0 1px 8px rgba(0, 0, 0, 0.25);
}

.hero-banner {
  position: relative;
  z-index: 2;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.18);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.3);
  margin-bottom: 28px;
}

.banner-slide {
  display: none;
  opacity: 0;
  transition: opacity var(--transition-slow);
}

.banner-slide.active {
  display: block;
  opacity: 1;
  animation: slideFadeIn 0.6s ease forwards;
}

@keyframes slideFadeIn {
  from { opacity: 0; transform: scale(1.02); }
  to { opacity: 1; transform: scale(1); }
}

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

.banner-controls {
  position: absolute;
  bottom: 16px;
  right: 16px;
  display: flex;
  gap: 10px;
  z-index: 3;
}

.banner-controls button {
  padding: 7px 16px;
  font-size: 0.8rem;
  font-weight: 600;
  font-family: inherit;
  color: #ffffff;
  background: rgba(0, 0, 0, 0.45);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.banner-controls button:hover {
  background: var(--brand-red);
  border-color: var(--brand-red);
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(200, 16, 46, 0.45);
}

.banner-controls button:active {
  transform: translateY(0) scale(0.97);
}

.hero-stats {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.hero-stats li {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 20px 12px;
  text-align: center;
  background: rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-md);
  transition: transform var(--transition-base), background var(--transition-base), box-shadow var(--transition-base);
}

.hero-stats li:hover {
  transform: translateY(-6px);
  background: rgba(255, 255, 255, 0.2);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.3);
}

.stat-num {
  font-size: 1.9rem;
  font-weight: 800;
  line-height: 1.1;
  color: var(--brand-gold);
  text-shadow: 0 2px 12px rgba(255, 209, 102, 0.45);
  font-variant-numeric: tabular-nums;
}

.stat-label {
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.88);
  letter-spacing: 0.02em;
}

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

#intro:hover,
#products:hover,
#solutions:hover,
#cases:hover,
#news:hover,
#articles:hover,
#faq:hover,
#howto:hover,
#knowledge:hover,
#contact:hover {
  box-shadow: var(--shadow-lg);
  border-color: var(--border-strong);
}

#cases blockquote {
  position: relative;
  margin: 16px 0;
  padding: 20px 24px 20px 56px;
  background: var(--bg-subtle);
  border-left: 4px solid var(--brand-red);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  transition: transform var(--transition-base), box-shadow var(--transition-base), background var(--transition-base);
}

#cases blockquote::before {
  content: "\201C";
  position: absolute;
  left: 18px;
  top: 6px;
  font-size: 3rem;
  line-height: 1;
  font-family: Georgia, serif;
  color: var(--brand-red);
  opacity: 0.35;
}

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

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

#news h3,
#articles h3 {
  padding-bottom: 8px;
  border-bottom: 1px dashed var(--border-color);
}

#news p:first-of-type,
#articles p:first-of-type {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 500;
  letter-spacing: 0.02em;
}

#articles a {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--brand-red);
  padding: 4px 12px;
  border-radius: var(--radius-full);
  background: rgba(200, 16, 46, 0.07);
  transition: all var(--transition-fast);
}

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

#articles a:hover {
  background: var(--brand-red);
  color: #ffffff;
  box-shadow: var(--shadow-brand);
  transform: translateY(-1px);
}

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

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

#faq details:hover {
  border-color: var(--brand-red);
  box-shadow: var(--shadow-md);
}

#faq details[open] {
  background: var(--bg-card);
  border-color: var(--brand-red);
  box-shadow: var(--shadow-md);
}

#faq summary {
  position: relative;
  padding: 16px 48px 16px 20px;
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--text-primary);
  cursor: pointer;
  list-style: none;
  transition: color var(--transition-fast), background var(--transition-fast);
}

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

#faq summary::after {
  content: "+";
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--brand-red);
  background: rgba(200, 16, 46, 0.09);
  border-radius: 50%;
  transition: transform var(--transition-base), background var(--transition-base), color var(--transition-base);
}

#faq details[open] summary::after {
  content: "\2212";
  background: var(--brand-red);
  color: #ffffff;
  transform: translateY(-50%) rotate(180deg);
}

#faq summary:hover {
  color: var(--brand-red);
  background: rgba(200, 16, 46, 0.05);
}

#faq details p {
  padding: 0 20px 18px;
  margin: 0;
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.85;
  animation: faqReveal 0.35s ease;
}

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

#howto ol {
  margin-bottom: 24px;
}

#howto ol li strong {
  color: var(--text-primary);
  font-weight: 700;
}

#howto ul li::before {
  background: linear-gradient(135deg, var(--brand-gold-dark), var(--brand-red));
}

#contact ul li {
  padding: 10px 14px 10px 40px;
  margin-bottom: 8px;
  background: var(--bg-subtle);
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast), transform var(--transition-fast);
}

#contact ul li::before {
  left: 16px;
}

#contact ul li:hover {
  background: rgba(200, 16, 46, 0.06);
  transform: translateX(4px);
}

#sitemap ul,
#links ul {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 10px;
}

#sitemap ul li,
#links ul li {
  padding: 0;
  margin: 0;
}

#sitemap ul li::before,
#links ul li::before {
  display: none;
}

#sitemap a,
#links a {
  display: block;
  padding: 12px 16px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

#sitemap a:hover,
#links a:hover {
  color: var(--text-inverse);
  background: linear-gradient(135deg, var(--brand-red), var(--brand-red-dark));
  border-color: var(--brand-red);
  transform: translateY(-3px);
  box-shadow: var(--shadow-brand);
}

#site-footer {
  background: linear-gradient(160deg, #1b1b1f 0%, #141418 60%, #0e0e12 100%);
  color: rgba(255, 255, 255, 0.82);
  padding: 56px 24px 32px;
  margin-top: 40px;
  position: relative;
  overflow: hidden;
}

#site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--brand-red), var(--brand-gold), var(--brand-red));
  background-size: 200% 100%;
  animation: footerLine 6s linear infinite;
}

@keyframes footerLine {
  0% { background-position: 0% 50%; }
  100% { background-position: 200% 50%; }
}

#site-footer section {
  max-width: var(--max-width);
  margin: 0 auto 28px;
  padding: 0;
  background: transparent;
  border: none;
  box-shadow: none;
  border-radius: 0;
}

#site-footer section:hover {
  box-shadow: none;
  border: none;
}

#site-footer h2 {
  font-size: 1.05rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 12px;
  padding-left: 14px;
}

#site-footer h2::before {
  width: 4px;
  background: linear-gradient(180deg, var(--brand-red), var(--brand-gold));
}

#site-footer p {
  font-size: 0.88rem;
  line-height: 1.85;
  color: rgba(255, 255, 255, 0.72);
  margin-bottom: 8px;
}

#site-footer a {
  color: var(--brand-gold);
}

#site-footer a:hover {
  color: #ffffff;
}

.update-info {
  max-width: var(--max-width);
  margin: 0 auto;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  text-align: center;
  font-size: 0.82rem;
  color: rgba(255, 255, 255, 0.5);
  letter-spacing: 0.02em;
}

#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: 0.72rem;
  font-weight: 700;
  font-family: inherit;
  color: #ffffff;
  background: linear-gradient(135deg, var(--brand-red), var(--brand-red-dark));
  border: none;
  border-radius: 50%;
  cursor: pointer;
  box-shadow: var(--shadow-brand);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px) scale(0.85);
  transition: opacity var(--transition-base), visibility var(--transition-base), transform var(--transition-base), box-shadow var(--transition-base);
}

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

#back-to-top:hover {
  transform: translateY(-4px) scale(1.08);
  box-shadow: 0 12px 32px rgba(200, 16, 46, 0.5);
}

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

.reveal {
  opacity: 0;
  transform: translateY(32px);
  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.revealed {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay-1 { transition-delay: 0.08s; }
.reveal-delay-2 { transition-delay: 0.16s; }
.reveal-delay-3 { transition-delay: 0.24s; }
.reveal-delay-4 { transition-delay: 0.32s; }

@media (max-width: 1080px) {
  #main-nav ul {
    gap: 2px;
  }

  #main-nav a {
    padding: 8px 9px;
    font-size: 0.84rem;
  }

  #search-input {
    width: 140px;
  }

  #search-input:focus {
    width: 170px;
  }
}

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

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

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

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

  #main-nav.open {
    max-height: 70vh;
    overflow-y: auto;
    padding: 12px 0;
  }

  #main-nav ul {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    padding: 0 16px;
    overflow: visible;
  }

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

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

  #menu-toggle {
    display: block;
  }

  #site-search {
    display: none;
  }

  main {
    padding: 0 16px 48px;
  }

  #hero {
    padding: 28px 20px 24px;
    border-radius: var(--radius-lg);
  }

  #hero-title {
    font-size: 1.5rem;
  }

  .hero-lead {
    font-size: 0.92rem;
  }

  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }

  .stat-num {
    font-size: 1.5rem;
  }

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

  section h2 {
    font-size: 1.3rem;
    padding-left: 14px;
  }

  section h3 {
    font-size: 1.06rem;
  }

  #sitemap ul,
  #links ul {
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  }
}

@media (max-width: 560px) {
  body {
    font-size: 15px;
  }

  .logo-area svg {
    width: 34px;
    height: 34px;
  }

  .site-name {
    font-size: 0.92rem;
  }

  #theme-toggle,
  #menu-toggle {
    padding: 7px 11px;
    font-size: 0.78rem;
  }

  #hero {
    padding: 24px 16px 20px;
  }

  #hero-title {
    font-size: 1.28rem;
  }

  .hero-lead {
    font-size: 0.86rem;
    line-height: 1.8;
  }

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

  .hero-stats li {
    padding: 14px 8px;
  }

  .stat-num {
    font-size: 1.3rem;
  }

  .stat-label {
    font-size: 0.72rem;
  }

  .banner-controls {
    bottom: 10px;
    right: 10px;
    gap: 6px;
  }

  .banner-controls button {
    padding: 5px 12px;
    font-size: 0.72rem;
  }

  section h2 {
    font-size: 1.15rem;
  }

  section h3 {
    font-size: 1rem;
  }

  section h4 {
    font-size: 0.94rem;
  }

  section p,
  section ul li,
  section ol li {
    font-size: 0.9rem;
  }

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

  #faq details p {
    padding: 0 16px 16px;
    font-size: 0.86rem;
  }

  #sitemap ul,
  #links ul {
    grid-template-columns: 1fr 1fr;
    gap: 8px;
  }

  #sitemap a,
  #links a {
    padding: 10px 12px;
    font-size: 0.82rem;
  }

  #site-footer {
    padding: 40px 16px 24px;
  }

  #back-to-top {
    right: 16px;
    bottom: 16px;
    width: 44px;
    height: 44px;
    font-size: 0.66rem;
  }
}

@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 print {
  #site-header,
  #back-to-top,
  .banner-controls,
  #theme-toggle,
  #menu-toggle,
  #site-search {
    display: none !important;
  }

  body {
    background: #ffffff;
    color: #000000;
  }

  section {
    break-inside: avoid;
    box-shadow: none;
    border: 1px solid #ccc;
  }

  a {
    color: #000000;
    text-decoration: underline;
  }
}