:root {
  --primary: #6a4c9c;
  --primary-light: #8b6bb5;
  --primary-dark: #4a2c7a;
  --primary-lighter: #b39ddb;
  --accent: #ffd966;
  --accent-hover: #ffcc33;
  --bg-body: #faf9fc;
  --bg-card: #ffffff;
  --bg-elevated: #f0edf5;
  --bg-header: rgba(255, 255, 255, 0.92);
  --bg-footer: #1e1e2e;
  --text-primary: #1e1e2e;
  --text-secondary: #555;
  --text-muted: #999;
  --border-color: #eee;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 8px 24px rgba(106, 76, 156, 0.15);
  --shadow-hover: 0 12px 32px rgba(106, 76, 156, 0.12);
  --radius-sm: 12px;
  --radius-md: 16px;
  --radius-lg: 20px;
  --radius-pill: 30px;
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.6s ease;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  --max-width: 1200px;
  --header-height: 64px;
}

body.dark-mode {
  --bg-body: #121212;
  --bg-card: #1e1e2e;
  --bg-elevated: #2a2a3a;
  --bg-header: rgba(18, 18, 18, 0.92);
  --bg-footer: #0a0a0a;
  --text-primary: #e0e0e0;
  --text-secondary: #aaa;
  --text-muted: #777;
  --border-color: #2a2a3a;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-hover: 0 12px 32px rgba(179, 157, 219, 0.15);
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  line-height: 1.7;
  color: var(--text-primary);
  background-color: var(--bg-body);
  transition: background-color var(--transition-base), color var(--transition-base);
  overflow-x: hidden;
  min-height: 100vh;
}

body.dark-mode {
  background-color: var(--bg-body);
  color: var(--text-primary);
}

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

body.dark-mode a {
  color: var(--primary-lighter);
}

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

body.dark-mode a:hover {
  color: #d1c4e9;
}

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

ul,
ol {
  padding-left: 1.5rem;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  line-height: 1.3;
  margin-bottom: 0.5em;
  font-weight: 700;
  color: var(--text-primary);
}

h2 {
  font-size: clamp(1.4rem, 3vw, 1.8rem);
  border-left: 5px solid var(--primary);
  padding-left: 0.75rem;
  margin-top: 2rem;
  margin-bottom: 1rem;
  transition: border-color var(--transition-base);
}

body.dark-mode h2 {
  border-left-color: var(--primary-lighter);
}

h3 {
  font-size: clamp(1.1rem, 2.5vw, 1.3rem);
}

p {
  margin-bottom: 0.75rem;
}

section {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2rem 1.5rem;
  scroll-margin-top: calc(var(--header-height) + 1rem);
}

#site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: var(--bg-header);
  backdrop-filter: blur(12px) saturate(180%);
  -webkit-backdrop-filter: blur(12px) saturate(180%);
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.06), 0 2px 12px rgba(0, 0, 0, 0.04);
  transition: background-color var(--transition-base), box-shadow var(--transition-base);
}

body.dark-mode #site-header {
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.06), 0 2px 12px rgba(0, 0, 0, 0.3);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1.5rem;
  gap: 1rem;
  min-height: var(--header-height);
}

.logo-area {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--primary);
  flex-shrink: 0;
  transition: color var(--transition-base);
  cursor: pointer;
}

body.dark-mode .logo-area {
  color: var(--primary-lighter);
}

.logo-area svg {
  transition: transform var(--transition-base);
}

.logo-area:hover svg {
  transform: rotate(-10deg) scale(1.1);
}

.site-name {
  white-space: nowrap;
}

#main-nav ul {
  display: flex;
  list-style: none;
  gap: 1.25rem;
  padding: 0;
}

#main-nav a {
  font-size: 0.95rem;
  font-weight: 500;
  padding: 0.25rem 0;
  border-bottom: 2px solid transparent;
  transition: border-color var(--transition-fast), color var(--transition-fast);
  color: var(--text-primary);
  white-space: nowrap;
}

#main-nav a:hover {
  border-bottom-color: var(--primary);
  text-decoration: none;
  color: var(--primary);
}

body.dark-mode #main-nav a:hover {
  border-bottom-color: var(--primary-lighter);
  color: var(--primary-lighter);
}

.header-tools {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
}

#search-form {
  display: flex;
  align-items: center;
  background: var(--bg-elevated);
  border-radius: var(--radius-pill);
  padding: 0.25rem 0.5rem;
  transition: background var(--transition-base), box-shadow var(--transition-fast);
  border: 1px solid transparent;
}

#search-form:focus-within {
  box-shadow: 0 0 0 2px var(--primary);
  border-color: transparent;
}

body.dark-mode #search-form {
  background: var(--bg-elevated);
}

#search-form input {
  border: none;
  background: transparent;
  padding: 0.4rem 0.5rem;
  font-size: 0.9rem;
  outline: none;
  width: 160px;
  color: var(--text-primary);
  font-family: inherit;
  transition: width var(--transition-base);
}

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

#search-form button {
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.25rem;
  color: var(--primary);
  display: flex;
  align-items: center;
  transition: color var(--transition-fast), transform var(--transition-fast);
}

#search-form button:hover {
  color: var(--primary-dark);
  transform: scale(1.1);
}

body.dark-mode #search-form button {
  color: var(--primary-lighter);
}

#dark-mode-toggle,
#mobile-menu-toggle {
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.45rem;
  color: var(--primary);
  display: flex;
  align-items: center;
  border-radius: 50%;
  transition: background var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}

#dark-mode-toggle:hover,
#mobile-menu-toggle:hover {
  background: var(--bg-elevated);
  transform: scale(1.1);
}

body.dark-mode #dark-mode-toggle,
body.dark-mode #mobile-menu-toggle {
  color: var(--primary-lighter);
}

#mobile-menu-toggle {
  display: none;
}

.breadcrumb {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0.75rem 1.5rem;
}

.breadcrumb ol {
  display: flex;
  list-style: none;
  gap: 0.5rem;
  font-size: 0.85rem;
  padding: 0;
  flex-wrap: wrap;
}

.breadcrumb li {
  color: var(--text-muted);
}

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

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

body.dark-mode .breadcrumb li a:hover {
  color: var(--primary-lighter);
}

.breadcrumb li:not(:last-child)::after {
  content: "/";
  margin-left: 0.5rem;
  color: var(--text-muted);
}

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

body.dark-mode .breadcrumb li[aria-current="page"] {
  color: var(--primary-lighter);
}

#home-banner {
  padding-top: 0.5rem;
}

.carousel {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  background: var(--primary-dark);
}

.slide {
  display: none;
  position: relative;
  animation: slideFadeIn 0.6s ease forwards;
}

.slide.active {
  display: block;
}

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

.slide-bg {
  width: 100%;
  height: auto;
  display: block;
  min-height: 280px;
  object-fit: cover;
}

.slide-content {
  position: absolute;
  top: 50%;
  left: 8%;
  transform: translateY(-50%);
  color: #fff;
  max-width: 520px;
  animation: slideContentUp 0.8s ease 0.2s both;
}

@keyframes slideContentUp {
  from {
    opacity: 0;
    transform: translateY(-40%);
  }
  to {
    opacity: 1;
    transform: translateY(-50%);
  }
}

.slide-content h2 {
  font-size: clamp(1.2rem, 3.5vw, 2rem);
  border: none;
  padding: 0;
  color: #fff;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.5);
  margin-bottom: 0.5rem;
}

.slide-content p {
  margin: 0.75rem 0 1.25rem;
  font-size: clamp(0.85rem, 2vw, 1.05rem);
  text-shadow: 0 1px 6px rgba(0, 0, 0, 0.4);
  opacity: 0.95;
}

.btn {
  display: inline-block;
  background: linear-gradient(135deg, var(--accent), var(--accent-hover));
  color: #1e1e2e;
  padding: 0.6rem 1.5rem;
  border-radius: var(--radius-pill);
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
  box-shadow: 0 4px 12px rgba(255, 217, 102, 0.3);
  position: relative;
  overflow: hidden;
}

.btn::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent, rgba(255, 255, 255, 0.3), transparent);
  transform: translateX(-100%);
  transition: transform 0.5s ease;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(255, 217, 102, 0.5);
  text-decoration: none;
  color: #1e1e2e;
}

.btn:hover::after {
  transform: translateX(100%);
}

.carousel-dots {
  position: absolute;
  bottom: 16px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 8px;
  z-index: 2;
}

.carousel-dots button {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: none;
  background: rgba(255, 255, 255, 0.5);
  cursor: pointer;
  padding: 0;
  transition: background var(--transition-fast), transform var(--transition-fast), width var(--transition-fast);
}

.carousel-dots button:hover {
  background: rgba(255, 255, 255, 0.8);
  transform: scale(1.2);
}

.carousel-dots button[aria-selected="true"] {
  background: var(--accent);
  width: 24px;
  border-radius: var(--radius-pill);
}

.about-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 2rem;
  align-items: start;
}

.about-text h3 {
  margin-top: 1.25rem;
  color: var(--primary);
  transition: color var(--transition-base);
}

body.dark-mode .about-text h3 {
  color: var(--primary-lighter);
}

.about-text h3:first-child {
  margin-top: 0;
}

.about-text p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.about-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  background: linear-gradient(135deg, var(--bg-elevated), rgba(106, 76, 156, 0.08));
  border-radius: var(--radius-md);
  padding: 1.5rem;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid rgba(106, 76, 156, 0.1);
  transition: background var(--transition-base), border-color var(--transition-base);
}

body.dark-mode .about-stats {
  background: linear-gradient(135deg, var(--bg-elevated), rgba(179, 157, 219, 0.08));
  border-color: rgba(179, 157, 219, 0.1);
}

.stat-item {
  text-align: center;
  padding: 0.5rem;
  border-radius: var(--radius-sm);
  transition: transform var(--transition-fast), background var(--transition-fast);
}

.stat-item:hover {
  transform: translateY(-3px);
  background: rgba(106, 76, 156, 0.06);
}

body.dark-mode .stat-item:hover {
  background: rgba(179, 157, 219, 0.08);
}

.stat-number {
  display: block;
  font-size: clamp(1.4rem, 3vw, 1.8rem);
  font-weight: 700;
  color: var(--primary);
  transition: color var(--transition-base);
  font-variant-numeric: tabular-nums;
}

body.dark-mode .stat-number {
  color: var(--primary-lighter);
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  transition: color var(--transition-base);
}

body.dark-mode .stat-label {
  color: var(--text-muted);
}

.product-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
}

.card {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base), background var(--transition-base);
  border: 1px solid var(--border-color);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--primary-light), var(--accent));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-base);
}

.card:hover::before {
  transform: scaleX(1);
}

body.dark-mode .card {
  background: var(--bg-card);
  border-color: var(--border-color);
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
}

.card h3 {
  color: var(--primary);
  transition: color var(--transition-base);
  margin-bottom: 0.75rem;
}

body.dark-mode .card h3 {
  color: var(--primary-lighter);
}

.card h4 {
  margin-top: 0.75rem;
  font-size: 0.95rem;
  color: var(--text-secondary);
  font-weight: 600;
}

body.dark-mode .card h4 {
  color: var(--text-secondary);
}

.card ul {
  margin-top: 0.5rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.card ul li {
  margin-bottom: 0.25rem;
  position: relative;
  list-style: none;
  padding-left: 1.2rem;
}

.card ul li::before {
  content: "✦";
  position: absolute;
  left: 0;
  color: var(--primary);
  font-size: 0.7rem;
}

body.dark-mode .card ul li::before {
  color: var(--primary-lighter);
}

.solution-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
}

.solution-item {
  background: linear-gradient(135deg, rgba(106, 76, 156, 0.06), rgba(139, 107, 181, 0.1));
  border-radius: var(--radius-md);
  padding: 1.5rem;
  border-left: 4px solid var(--primary);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base), background var(--transition-base);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

body.dark-mode .solution-item {
  background: linear-gradient(135deg, rgba(179, 157, 219, 0.06), rgba(179, 157, 219, 0.1));
  border-left-color: var(--primary-lighter);
}

.solution-item:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow-md);
}

.solution-item h3 {
  color: var(--primary);
  transition: color var(--transition-base);
}

body.dark-mode .solution-item h3 {
  color: var(--primary-lighter);
}

.solution-item p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.case-list {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.case-item {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-base), box-shadow var(--transition-base), background var(--transition-base);
  border: 1px solid var(--border-color);
}

body.dark-mode .case-item {
  background: var(--bg-card);
  border-color: var(--border-color);
}

.case-item:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.case-item h3 {
  color: var(--primary);
  transition: color var(--transition-base);
}

body.dark-mode .case-item h3 {
  color: var(--primary-lighter);
}

.case-item p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

blockquote {
  margin-top: 1rem;
  padding: 1rem 1.25rem;
  border-left: 3px solid var(--primary);
  background: var(--bg-elevated);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-style: italic;
  color: var(--text-secondary);
  transition: border-color var(--transition-base), background var(--transition-base);
}

body.dark-mode blockquote {
  color: var(--text-secondary);
  border-left-color: var(--primary-lighter);
  background: var(--bg-elevated);
}

blockquote p {
  margin-bottom: 0.5rem;
}

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

.article-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.article-card {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-base), box-shadow var(--transition-base), background var(--transition-base), border-color var(--transition-base);
  border: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
}

body.dark-mode .article-card {
  background: var(--bg-card);
  border-color: var(--border-color);
}

.article-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
}

.article-card h3 {
  font-size: 1.05rem;
  margin-bottom: 0.25rem;
  line-height: 1.4;
}

.article-card h3 a {
  color: var(--text-primary);
  transition: color var(--transition-fast);
  display: block;
}

.article-card h3 a:hover {
  color: var(--primary);
  text-decoration: none;
}

body.dark-mode .article-card h3 a:hover {
  color: var(--primary-lighter);
}

.article-card time {
  font-size: 0.8rem;
  color: var(--text-muted);
  display: block;
  margin-bottom: 0.5rem;
}

.article-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.read-more {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  transition: gap var(--transition-fast), color var(--transition-fast);
  margin-top: auto;
}

.read-more::after {
  content: "→";
  transition: transform var(--transition-fast);
}

.read-more:hover {
  text-decoration: none;
  gap: 0.5rem;
}

.read-more:hover::after {
  transform: translateX(4px);
}

body.dark-mode .read-more {
  color: var(--primary-lighter);
}

.faq-list details {
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  margin-bottom: 0.75rem;
  padding: 0.75rem 1rem;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-base), background var(--transition-base), border-color var(--transition-base);
  border: 1px solid var(--border-color);
  overflow: hidden;
}

body.dark-mode .faq-list details {
  background: var(--bg-card);
  border-color: var(--border-color);
}

.faq-list details[open] {
  box-shadow: var(--shadow-md);
}

.faq-list summary {
  cursor: pointer;
  font-weight: 600;
  padding: 0.5rem 0;
  color: var(--primary);
  transition: color var(--transition-fast);
  list-style: none;
  position: relative;
  padding-right: 1.5rem;
}

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

.faq-list summary::after {
  content: "+";
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.2rem;
  font-weight: 400;
  color: var(--primary);
  transition: transform var(--transition-base), color var(--transition-base);
}

details[open] summary::after {
  content: "−";
  transform: translateY(-50%) rotate(180deg);
}

body.dark-mode .faq-list summary {
  color: var(--primary-lighter);
}

body.dark-mode .faq-list summary::after {
  color: var(--primary-lighter);
}

.faq-list summary:hover {
  color: var(--primary-dark);
}

body.dark-mode .faq-list summary:hover {
  color: #d1c4e9;
}

.faq-list p {
  margin-top: 0.5rem;
  font-size: 0.95rem;
  color: var(--text-secondary);
  animation: fadeInUp 0.3s ease;
}

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

.howto-content {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  transition: background var(--transition-base), border-color var(--transition-base);
}

body.dark-mode .howto-content {
  background: var(--bg-card);
  border-color: var(--border-color);
}

.howto-content h3 {
  margin-top: 1.25rem;
  color: var(--primary);
  transition: color var(--transition-base);
}

body.dark-mode .howto-content h3 {
  color: var(--primary-lighter);
}

.howto-content h3:first-child {
  margin-top: 0;
}

.howto-content ol,
.howto-content ul {
  margin-bottom: 1rem;
  color: var(--text-secondary);
}

.howto-content li {
  margin-bottom: 0.4rem;
  font-size: 0.95rem;
}

.howto-content strong {
  color: var(--text-primary);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

.contact-info,
.contact-extra {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  transition: background var(--transition-base), border-color var(--transition-base);
}

body.dark-mode .contact-info,
body.dark-mode .contact-extra {
  background: var(--bg-card);
  border-color: var(--border-color);
}

.contact-info h3,
.contact-extra h3 {
  color: var(--primary);
  transition: color var(--transition-base);
  margin-bottom: 0.75rem;
}

body.dark-mode .contact-info h3,
body.dark-mode .contact-extra h3 {
  color: var(--primary-lighter);
}

.contact-info p,
.contact-extra p {
  margin-bottom: 0.4rem;
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.contact-info strong {
  color: var(--text-primary);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
}

.footer-col h3 {
  font-size: 1rem;
  color: var(--primary);
  margin-bottom: 0.75rem;
  transition: color var(--transition-base);
}

body.dark-mode .footer-col h3 {
  color: var(--primary-lighter);
}

.footer-col ul {
  list-style: none;
  padding: 0;
}

.footer-col li {
  margin-bottom: 0.4rem;
  font-size: 0.9rem;
}

.footer-col a {
  color: var(--text-secondary);
  transition: color var(--transition-fast), padding-left var(--transition-fast);
  display: inline-block;
}

.footer-col a:hover {
  color: var(--primary);
  padding-left: 4px;
  text-decoration: none;
}

body.dark-mode .footer-col a:hover {
  color: var(--primary-lighter);
}

.footer-col p {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.6;
}

#back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 16px rgba(106, 76, 156, 0.4);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: opacity var(--transition-base), visibility var(--transition-base), transform var(--transition-base), box-shadow var(--transition-fast);
  z-index: 999;
}

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

#back-to-top:hover {
  transform: translateY(-4px) scale(1.05);
  box-shadow: 0 8px 24px rgba(106, 76, 156, 0.6);
}

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

#site-footer {
  background: var(--bg-footer);
  color: #ccc;
  padding: 2rem 1.5rem;
  margin-top: 2rem;
  transition: background var(--transition-base);
}

body.dark-mode #site-footer {
  background: var(--bg-footer);
}

.footer-bottom {
  max-width: var(--max-width);
  margin: 0 auto;
  text-align: center;
  font-size: 0.85rem;
  line-height: 1.8;
}

.footer-bottom p {
  margin-bottom: 0.25rem;
}

.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
  will-change: opacity, transform;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

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

body.dark-mode ::selection {
  background: var(--primary-lighter);
  color: #121212;
}

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

::-webkit-scrollbar-track {
  background: var(--bg-elevated);
}

::-webkit-scrollbar-thumb {
  background: var(--primary-light);
  border-radius: 4px;
}

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

body.dark-mode ::-webkit-scrollbar-track {
  background: var(--bg-elevated);
}

body.dark-mode ::-webkit-scrollbar-thumb {
  background: var(--primary-dark);
}

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

body.dark-mode *:focus-visible {
  outline-color: var(--primary-lighter);
}

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

  .header-inner {
    padding: 0.6rem 1rem;
  }

  #main-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-card);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--border-color);
    animation: menuSlideDown 0.3s ease;
  }

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

  body.dark-mode #main-nav {
    background: var(--bg-card);
    border-top-color: var(--border-color);
  }

  #main-nav.open {
    display: block;
  }

  #main-nav ul {
    flex-direction: column;
    gap: 0.75rem;
  }

  #main-nav a {
    display: block;
    padding: 0.5rem 0;
    font-size: 1rem;
  }

  #mobile-menu-toggle {
    display: flex;
  }

  .about-grid {
    grid-template-columns: 1fr;
  }

  .contact-grid {
    grid-template-columns: 1fr;
  }

  .slide-content h2 {
    font-size: 1.4rem;
  }

  .slide-content p {
    font-size: 0.9rem;
  }

  #search-form input {
    width: 110px;
  }

  #back-to-top {
    bottom: 1.5rem;
    right: 1.5rem;
    width: 42px;
    height: 42px;
  }
}

@media (max-width: 600px) {
  section {
    padding: 1.5rem 1rem;
  }

  .breadcrumb {
    padding: 0.5rem 1rem;
  }

  .slide-bg {
    min-height: 220px;
  }

  .slide-content {
    left: 6%;
    max-width: 88%;
  }

  .slide-content h2 {
    font-size: 1.15rem;
  }

  .slide-content p {
    font-size: 0.8rem;
    margin: 0.5rem 0 0.75rem;
  }

  .btn {
    padding: 0.5rem 1.1rem;
    font-size: 0.85rem;
  }

  .about-stats {
    grid-template-columns: 1fr 1fr;
    padding: 1rem;
    gap: 0.75rem;
  }

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

  .product-cards,
  .solution-grid,
  .article-grid {
    grid-template-columns: 1fr;
  }

  .card,
  .solution-item,
  .article-card,
  .case-item,
  .howto-content,
  .contact-info,
  .contact-extra {
    padding: 1.25rem;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
}

@media (max-width: 480px) {
  .header-inner {
    flex-wrap: wrap;
    gap: 0.5rem;
  }

  .logo-area {
    font-size: 1rem;
  }

  .logo-area svg {
    width: 32px;
    height: 32px;
  }

  #search-form {
    order: 3;
    width: 100%;
  }

  #search-form input {
    width: 100%;
  }

  .header-tools {
    gap: 0.4rem;
  }

  .slide-content {
    left: 5%;
    max-width: 90%;
  }

  .slide-content h2 {
    font-size: 1rem;
  }

  .slide-content p {
    font-size: 0.75rem;
  }

  .carousel-dots button {
    width: 8px;
    height: 8px;
  }

  .carousel-dots button[aria-selected="true"] {
    width: 20px;
  }

  .about-stats {
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
  }

  .stat-number {
    font-size: 1.1rem;
  }

  .stat-label {
    font-size: 0.75rem;
  }

  #back-to-top {
    bottom: 1rem;
    right: 1rem;
    width: 38px;
    height: 38px;
  }

  #back-to-top svg {
    width: 18px;
    height: 18px;
  }
}

@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;
  }

  .fade-in {
    opacity: 1;
    transform: none;
  }
}

@media print {
  #site-header,
  #back-to-top,
  #site-footer,
  .carousel-dots,
  #dark-mode-toggle,
  #mobile-menu-toggle,
  #search-form {
    display: none !important;
  }

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

  .card,
  .article-card,
  .case-item,
  .faq-list details {
    box-shadow: none;
    border: 1px solid #ddd;
  }
}