:root {
  --primary: #e63946;
  --primary-dark: #c1121f;
  --primary-light: #ff6b7a;
  --secondary: #457b9d;
  --accent: #a8dadc;
  --dark: #1d3557;
  --darker: #0d1b2a;
  --light: #f1faee;
  --white: #ffffff;
  --gray-50: #f8f9fa;
  --gray-100: #e9ecef;
  --gray-200: #dee2e6;
  --gray-300: #ced4da;
  --gray-400: #adb5bd;
  --gray-500: #6c757d;
  --gray-600: #495057;
  --gray-700: #343a40;
  --gray-800: #212529;
  --gray-900: #0d1b2a;
  --bg-body: #f5f7fa;
  --bg-card: rgba(255, 255, 255, 0.85);
  --bg-card-solid: #ffffff;
  --bg-header: rgba(255, 255, 255, 0.82);
  --bg-footer: #1d3557;
  --text-primary: #212529;
  --text-secondary: #495057;
  --text-muted: #6c757d;
  --text-inverse: #f1faee;
  --border-color: rgba(0, 0, 0, 0.08);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.12);
  --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.16);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 24px;
  --radius-full: 9999px;
  --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);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --max-width: 1200px;
  --header-height: 64px;
}

[data-theme="dark"] {
  --bg-body: #0d1b2a;
  --bg-card: rgba(29, 53, 87, 0.7);
  --bg-card-solid: #1b2a41;
  --bg-header: rgba(13, 27, 42, 0.85);
  --bg-footer: #0a1628;
  --text-primary: #f1faee;
  --text-secondary: #ced4da;
  --text-muted: #adb5bd;
  --text-inverse: #1d3557;
  --border-color: rgba(255, 255, 255, 0.1);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.5);
  --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.6);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg-body: #0d1b2a;
    --bg-card: rgba(29, 53, 87, 0.7);
    --bg-card-solid: #1b2a41;
    --bg-header: rgba(13, 27, 42, 0.85);
    --bg-footer: #0a1628;
    --text-primary: #f1faee;
    --text-secondary: #ced4da;
    --text-muted: #adb5bd;
    --text-inverse: #1d3557;
    --border-color: rgba(255, 255, 255, 0.1);
  }
}

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

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

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

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

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

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

ul,
ol {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  transition: all var(--transition-fast);
}

input {
  font-family: inherit;
}

h1, h2, h3, h4, h5, h6 {
  line-height: 1.3;
  font-weight: 700;
  color: var(--text-primary);
  transition: color var(--transition-base);
}

h1 { font-size: 2.2rem; }
h2 { font-size: 1.75rem; }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.1rem; }

p {
  margin-bottom: 0.75rem;
  color: var(--text-secondary);
  transition: color var(--transition-base);
}

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

::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--gray-100);
}

[data-theme="dark"] ::-webkit-scrollbar-track {
  background: var(--darker);
}

::-webkit-scrollbar-thumb {
  background: var(--gray-400);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--gray-500);
}

#siteHeader {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--bg-header);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border-bottom: 1px solid var(--border-color);
  transition: background var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

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

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
  height: var(--header-height);
  display: flex;
  align-items: center;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-primary);
  white-space: nowrap;
  flex-shrink: 0;
  transition: transform var(--transition-fast);
}

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

.brand svg {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
  border-radius: 10px;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.brand:hover svg {
  transform: rotate(-6deg) scale(1.08);
  box-shadow: 0 4px 14px rgba(230, 57, 70, 0.35);
}

#mainNav {
  display: flex;
  align-items: center;
  gap: 2px;
  flex: 1;
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

#mainNav::-webkit-scrollbar {
  display: none;
}

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

#mainNav a::after {
  content: "";
  position: absolute;
  bottom: 4px;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 60%;
  height: 2px;
  background: var(--primary);
  border-radius: var(--radius-full);
  transition: transform var(--transition-base);
}

#mainNav a:hover {
  color: var(--primary);
  background: rgba(230, 57, 70, 0.06);
}

#mainNav a:hover::after {
  transform: translateX(-50%) scaleX(1);
}

.search-form {
  display: flex;
  align-items: center;
  gap: 0;
  flex-shrink: 0;
  border-radius: var(--radius-full);
  overflow: hidden;
  border: 1px solid var(--border-color);
  background: var(--bg-card-solid);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.search-form:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(230, 57, 70, 0.15);
}

.search-form input {
  width: 160px;
  padding: 8px 14px;
  font-size: 0.85rem;
  border: none;
  outline: none;
  background: transparent;
  color: var(--text-primary);
  transition: width var(--transition-base);
}

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

.search-form input:focus {
  width: 200px;
}

.search-form button {
  padding: 8px 16px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--white);
  background: var(--primary);
  border-radius: 0 var(--radius-full) var(--radius-full) 0;
  transition: background var(--transition-fast);
}

.search-form button:hover {
  background: var(--primary-dark);
}

#menuToggle {
  display: none;
  padding: 8px 16px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  background: var(--bg-card-solid);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

#menuToggle:hover {
  border-color: var(--primary);
  color: var(--primary);
}

#themeToggle {
  padding: 8px 14px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
  background: var(--bg-card-solid);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  white-space: nowrap;
  flex-shrink: 0;
  transition: all var(--transition-fast);
}

#themeToggle:hover {
  color: var(--primary);
  border-color: var(--primary);
  background: rgba(230, 57, 70, 0.06);
  transform: translateY(-1px);
}

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

.hero {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  padding: 60px 0 48px;
  position: relative;
}

.hero::before {
  content: "";
  position: absolute;
  top: -60px;
  left: -20px;
  right: -20px;
  bottom: 0;
  background: linear-gradient(135deg, rgba(230, 57, 70, 0.06) 0%, rgba(69, 123, 157, 0.08) 50%, rgba(168, 218, 220, 0.06) 100%);
  border-radius: var(--radius-xl);
  z-index: -1;
  pointer-events: none;
}

.hero-text h1 {
  font-size: 2.4rem;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 20px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 60%, var(--accent) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: heroTitleIn 0.8s ease-out both;
}

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

.hero-text > p {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text-secondary);
  margin-bottom: 16px;
  animation: heroTextIn 0.8s ease-out 0.15s both;
}

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

.hero-actions {
  display: flex;
  gap: 14px;
  margin-top: 24px;
  margin-bottom: 32px;
  flex-wrap: wrap;
  animation: heroTextIn 0.8s ease-out 0.3s both;
}

.btn-primary,
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.btn-primary {
  color: var(--white);
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  box-shadow: 0 4px 16px rgba(230, 57, 70, 0.35);
}

.btn-primary:hover {
  color: var(--white);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(230, 57, 70, 0.45);
}

.btn-primary::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent 0%, rgba(255, 255, 255, 0.2) 100%);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.btn-primary:hover::after {
  opacity: 1;
}

.btn-secondary {
  color: var(--primary);
  background: var(--bg-card-solid);
  border: 2px solid var(--primary);
}

.btn-secondary:hover {
  color: var(--white);
  background: var(--primary);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(230, 57, 70, 0.3);
}

.hero-stats {
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
  animation: heroTextIn 0.8s ease-out 0.45s both;
}

.hero-stats li {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.hero-stats strong {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--primary);
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.hero-stats span {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 500;
}

.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
  animation: heroVisualIn 1s ease-out 0.2s both;
}

@keyframes heroVisualIn {
  from {
    opacity: 0;
    transform: translateX(30px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateX(0) scale(1);
  }
}

.hero-visual svg {
  width: 100%;
  max-width: 520px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  transition: transform var(--transition-slow), box-shadow var(--transition-slow);
}

.hero-visual svg:hover {
  transform: translateY(-6px) scale(1.01);
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.2);
}

.breadcrumb {
  padding: 16px 0;
  animation: fadeInUp 0.6s ease-out both;
}

.breadcrumb ol {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  font-size: 0.85rem;
}

.breadcrumb li {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
}

.breadcrumb li + li::before {
  content: "/";
  color: var(--gray-400);
  font-weight: 400;
}

.breadcrumb a {
  color: var(--text-secondary);
  font-weight: 500;
  transition: color var(--transition-fast);
}

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

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

.section {
  padding: 48px 0;
  animation: fadeInUp 0.7s ease-out both;
}

.section h2 {
  font-size: 1.75rem;
  font-weight: 800;
  margin-bottom: 28px;
  padding-bottom: 14px;
  position: relative;
  color: var(--text-primary);
}

.section h2::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 56px;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--primary-light));
  border-radius: var(--radius-full);
}

.section h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-top: 28px;
  margin-bottom: 12px;
  color: var(--text-primary);
  padding-left: 14px;
  border-left: 4px solid var(--primary);
  transition: border-color var(--transition-fast), padding-left var(--transition-fast);
}

.section h3:hover {
  border-color: var(--primary-light);
  padding-left: 18px;
}

.section p {
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--text-secondary);
  margin-bottom: 12px;
}

.section ul,
.section ol {
  margin: 12px 0 20px;
  padding-left: 4px;
}

.section ul li,
.section ol li {
  position: relative;
  padding: 8px 0 8px 28px;
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--text-secondary);
  transition: color var(--transition-fast), transform var(--transition-fast);
}

.section ul li::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 16px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.section ul li:hover::before {
  transform: scale(1.4);
  box-shadow: 0 0 0 4px rgba(230, 57, 70, 0.15);
}

.section ol {
  counter-reset: item;
}

.section ol li {
  counter-increment: item;
}

.section ol li::before {
  content: counter(item);
  position: absolute;
  left: 0;
  top: 10px;
  width: 22px;
  height: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--white);
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  border-radius: 50%;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.section ol li:hover::before {
  transform: scale(1.15);
  box-shadow: 0 0 0 4px rgba(230, 57, 70, 0.15);
}

#brand,
#products,
#solutions,
#cases,
#articles,
#faq,
#howto,
#knowledge,
#contact,
#sitemap,
#links,
#legal {
  background: var(--bg-card);
  backdrop-filter: blur(12px) saturate(150%);
  -webkit-backdrop-filter: blur(12px) saturate(150%);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 36px 32px;
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-base), border-color var(--transition-base), background var(--transition-base), transform var(--transition-base);
}

#brand:hover,
#products:hover,
#solutions:hover,
#cases:hover,
#articles:hover,
#faq:hover,
#howto:hover,
#knowledge:hover,
#contact:hover,
#sitemap:hover,
#links:hover,
#legal:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

blockquote {
  margin: 20px 0;
  padding: 20px 24px;
  background: linear-gradient(135deg, rgba(230, 57, 70, 0.05) 0%, rgba(69, 123, 157, 0.05) 100%);
  border-left: 4px solid var(--primary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

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

blockquote p {
  font-style: italic;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

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

.article-card {
  background: var(--bg-card-solid);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 16px;
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
  position: relative;
  overflow: hidden;
}

.article-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 0;
  background: linear-gradient(180deg, var(--primary), var(--secondary));
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  transition: height var(--transition-slow);
}

.article-card:hover::before {
  height: 100%;
}

.article-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(230, 57, 70, 0.2);
}

.article-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin: 0 0 8px;
  padding-left: 0;
  border-left: none;
  color: var(--text-primary);
  transition: color var(--transition-fast);
}

.article-card:hover h3 {
  color: var(--primary);
}

.article-card time {
  display: inline-block;
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 10px;
  padding: 2px 10px;
  background: rgba(230, 57, 70, 0.08);
  border-radius: var(--radius-full);
  font-weight: 500;
}

.article-card p {
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: 12px;
}

.article-card a {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--primary);
  transition: gap var(--transition-fast), color var(--transition-fast);
}

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

.article-card a:hover {
  gap: 8px;
  color: var(--primary-dark);
}

.article-card a:hover::after {
  transform: translateX(2px);
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.faq-list details {
  background: var(--bg-card-solid);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
}

.faq-list details:hover {
  border-color: rgba(230, 57, 70, 0.25);
  box-shadow: var(--shadow-sm);
}

.faq-list details[open] {
  border-color: rgba(230, 57, 70, 0.3);
  box-shadow: var(--shadow-md);
}

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

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

.faq-list summary::after {
  content: "+";
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--primary);
  background: rgba(230, 57, 70, 0.08);
  border-radius: 50%;
  transition: transform var(--transition-base), background var(--transition-base), color var(--transition-base);
}

.faq-list details[open] summary::after {
  content: "−";
  transform: rotate(180deg);
  background: var(--primary);
  color: var(--white);
}

.faq-list summary:hover {
  color: var(--primary);
  background: rgba(230, 57, 70, 0.03);
}

.faq-list details p {
  padding: 0 20px 18px;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--text-secondary);
  animation: faqSlideIn 0.3s ease-out both;
}

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

#howto ol {
  counter-reset: howto;
}

#howto ol li {
  counter-increment: howto;
}

#howto ol li::before {
  content: counter(howto);
  background: linear-gradient(135deg, var(--secondary), var(--dark));
}

#contact p {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 6px 0;
  font-size: 0.92rem;
}

#contact p::before {
  content: "";
  flex-shrink: 0;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--primary);
  margin-top: 6px;
}

#sitemap ul,
#links ul {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 8px;
}

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

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

#sitemap a,
#links a {
  display: block;
  padding: 10px 16px;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--bg-card-solid);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

#sitemap a:hover,
#links a:hover {
  color: var(--white);
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  border-color: transparent;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(230, 57, 70, 0.25);
}

.back-to-top-wrap {
  display: flex;
  justify-content: center;
  padding: 24px 0 40px;
}

#backToTop {
  padding: 12px 32px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--primary);
  background: var(--bg-card-solid);
  border: 2px solid var(--primary);
  border-radius: var(--radius-full);
  transition: all var(--transition-base);
  box-shadow: var(--shadow-sm);
}

#backToTop:hover {
  color: var(--white);
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  border-color: transparent;
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(230, 57, 70, 0.35);
}

#backToTop:active {
  transform: translateY(-1px);
}

footer {
  background: var(--bg-footer);
  color: var(--text-inverse);
  text-align: center;
  padding: 36px 20px;
  margin-top: 24px;
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
  transition: background var(--transition-base);
}

footer p {
  color: rgba(241, 250, 238, 0.75);
  font-size: 0.85rem;
  margin-bottom: 6px;
}

footer p:last-child {
  margin-bottom: 0;
  font-weight: 500;
  color: rgba(241, 250, 238, 0.9);
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.section.visible {
  animation: fadeInUp 0.7s ease-out both;
}

@media (max-width: 1024px) {
  .hero {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 40px 0 32px;
  }

  .hero-text h1 {
    font-size: 2rem;
  }

  .hero-visual {
    order: -1;
  }

  .hero-visual svg {
    max-width: 420px;
  }

  .search-form input {
    width: 120px;
  }

  .search-form input:focus {
    width: 150px;
  }

  #mainNav a {
    padding: 8px 10px;
    font-size: 0.82rem;
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 56px;
  }

  body {
    font-size: 15px;
  }

  h1 { font-size: 1.6rem; }
  h2 { font-size: 1.35rem; }
  h3 { font-size: 1.1rem; }

  .header-inner {
    padding: 0 14px;
    gap: 10px;
    flex-wrap: wrap;
  }

  .brand span {
    font-size: 1.05rem;
  }

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

  #menuToggle {
    display: block;
    margin-left: auto;
  }

  #mainNav {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--bg-header);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--border-color);
    padding: 12px 14px;
    gap: 4px;
    box-shadow: var(--shadow-lg);
    animation: navSlideDown 0.25s ease-out both;
    max-height: calc(100vh - var(--header-height));
    overflow-y: auto;
  }

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

  #mainNav.open {
    display: flex;
  }

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

  #mainNav a::after {
    display: none;
  }

  .search-form {
    order: 10;
    width: 100%;
    margin-top: 4px;
    margin-bottom: 8px;
  }

  .search-form input {
    flex: 1;
    width: auto;
  }

  .search-form input:focus {
    width: auto;
  }

  #themeToggle {
    padding: 7px 12px;
    font-size: 0.75rem;
  }

  main {
    padding: 0 14px;
  }

  .hero {
    padding: 28px 0 24px;
  }

  .hero::before {
    top: -20px;
    left: -14px;
    right: -14px;
    border-radius: var(--radius-lg);
  }

  .hero-text h1 {
    font-size: 1.5rem;
    margin-bottom: 14px;
  }

  .hero-text > p {
    font-size: 0.9rem;
  }

  .hero-actions {
    gap: 10px;
    margin-top: 18px;
    margin-bottom: 24px;
  }

  .btn-primary,
  .btn-secondary {
    padding: 10px 22px;
    font-size: 0.88rem;
  }

  .hero-stats {
    gap: 20px;
  }

  .hero-stats strong {
    font-size: 1.4rem;
  }

  .hero-stats span {
    font-size: 0.72rem;
  }

  .hero-visual svg {
    max-width: 100%;
  }

  .section {
    padding: 32px 0;
  }

  #brand,
  #products,
  #solutions,
  #cases,
  #articles,
  #faq,
  #howto,
  #knowledge,
  #contact,
  #sitemap,
  #links,
  #legal {
    padding: 24px 18px;
    border-radius: var(--radius-lg);
    margin-bottom: 16px;
  }

  .section h2 {
    font-size: 1.3rem;
    margin-bottom: 20px;
    padding-bottom: 12px;
  }

  .section h2::after {
    width: 44px;
    height: 3px;
  }

  .section h3 {
    font-size: 1.05rem;
    margin-top: 22px;
    margin-bottom: 10px;
    padding-left: 10px;
    border-left-width: 3px;
  }

  .section p {
    font-size: 0.88rem;
  }

  .section ul li,
  .section ol li {
    font-size: 0.88rem;
    padding: 6px 0 6px 24px;
  }

  .section ol li::before {
    width: 20px;
    height: 20px;
    font-size: 0.65rem;
  }

  .article-card {
    padding: 18px;
  }

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

  .faq-list summary {
    padding: 14px 16px;
    font-size: 0.88rem;
  }

  .faq-list details p {
    padding: 0 16px 14px;
    font-size: 0.85rem;
  }

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

  #sitemap a,
  #links a {
    padding: 8px 12px;
    font-size: 0.82rem;
  }

  #backToTop {
    padding: 10px 26px;
    font-size: 0.85rem;
  }

  footer {
    padding: 28px 16px;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  }
}

@media (max-width: 480px) {
  .hero-text h1 {
    font-size: 1.3rem;
  }

  .hero-stats {
    gap: 16px;
  }

  .hero-stats strong {
    font-size: 1.2rem;
  }

  .hero-actions {
    flex-direction: column;
  }

  .btn-primary,
  .btn-secondary {
    width: 100%;
    justify-content: center;
  }

  .section h2 {
    font-size: 1.15rem;
  }

  .section h3 {
    font-size: 0.98rem;
  }

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

  .faq-list summary {
    font-size: 0.84rem;
    padding: 12px 14px;
  }
}

@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;
  }
}

@media print {
  #siteHeader,
  #backToTop,
  .back-to-top-wrap,
  .hero-actions,
  .search-form,
  #menuToggle,
  #themeToggle {
    display: none !important;
  }

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

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