:root {
  --primary: #e94560;
  --primary-dark: #c7354e;
  --secondary: #f5c518;
  --accent: #0f3460;
  --bg: #ffffff;
  --bg-alt: #f7f8fc;
  --bg-card: #ffffff;
  --text: #1a1a2e;
  --text-light: #555770;
  --text-muted: #8a8ca0;
  --border: #e8e9f0;
  --shadow-sm: 0 2px 8px rgba(26, 26, 46, 0.06);
  --shadow-md: 0 8px 24px rgba(26, 26, 46, 0.1);
  --shadow-lg: 0 16px 48px rgba(26, 26, 46, 0.14);
  --glass-bg: rgba(255, 255, 255, 0.72);
  --glass-border: rgba(255, 255, 255, 0.4);
  --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #e94560 100%);
  --gradient-hero: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
  --gradient-accent: linear-gradient(135deg, #e94560 0%, #f5c518 100%);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-xl: 32px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}

[data-theme="dark"] {
  --bg: #0f0f1a;
  --bg-alt: #16162a;
  --bg-card: #1c1c34;
  --text: #eef0f6;
  --text-light: #b0b3c8;
  --text-muted: #7a7d95;
  --border: #2a2a48;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.5);
  --glass-bg: rgba(28, 28, 52, 0.78);
  --glass-border: rgba(255, 255, 255, 0.08);
  --gradient-hero: linear-gradient(135deg, #0a0a14 0%, #12122a 50%, #1a1a3e 100%);
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  font-size: 16px;
}

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

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

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

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

ul, ol {
  list-style: none;
}

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

h1 { font-size: clamp(1.75rem, 4vw, 2.75rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.125rem); }
h3 { font-size: clamp(1.15rem, 2vw, 1.4rem); }
h4 { font-size: 1.05rem; }

p { margin-bottom: 0.75em; }

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

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}
::-webkit-scrollbar-track {
  background: var(--bg-alt);
}
::-webkit-scrollbar-thumb {
  background: var(--text-muted);
  border-radius: 5px;
  border: 2px solid var(--bg-alt);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--primary);
}

/* ===== Header ===== */
#siteHeader {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--glass-bg);
  backdrop-filter: blur(18px) saturate(180%);
  -webkit-backdrop-filter: blur(18px) saturate(180%);
  border-bottom: 1px solid var(--glass-border);
  transition: background var(--transition), box-shadow var(--transition), transform var(--transition);
}

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

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--text);
  letter-spacing: 0.5px;
  flex-shrink: 0;
  transition: transform var(--transition);
}

.logo:hover {
  transform: scale(1.04);
  color: var(--text);
}

.logo svg {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  transition: transform 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.logo:hover svg {
  transform: rotate(12deg) scale(1.08);
}

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

#mainNav a {
  display: block;
  padding: 8px 14px;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-light);
  border-radius: var(--radius-sm);
  position: relative;
  transition: color var(--transition), background var(--transition);
  white-space: nowrap;
}

#mainNav a::after {
  content: '';
  position: absolute;
  bottom: 4px;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--gradient-accent);
  border-radius: 2px;
  transform: translateX(-50%);
  transition: width var(--transition);
}

#mainNav a:hover,
#mainNav a.active {
  color: var(--primary);
  background: rgba(233, 69, 96, 0.08);
}

#mainNav a:hover::after,
#mainNav a.active::after {
  width: 60%;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}

.header-actions button {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: none;
  background: transparent;
  color: var(--text-light);
  border-radius: 50%;
  cursor: pointer;
  transition: background var(--transition), color var(--transition), transform var(--transition);
}

.header-actions button:hover {
  background: rgba(233, 69, 96, 0.1);
  color: var(--primary);
  transform: scale(1.1);
}

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

#mobileMenuBtn {
  display: none;
}

/* ===== Search Bar ===== */
.search-bar {
  border-top: 1px solid var(--border);
  padding: 16px 20px;
  background: var(--glass-bg);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  animation: slideDown 0.3s ease;
}

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

.search-bar form {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  gap: 10px;
}

.search-bar input {
  flex: 1;
  padding: 12px 18px;
  border: 2px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--bg-card);
  color: var(--text);
  font-size: 1rem;
  font-family: inherit;
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.search-bar input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(233, 69, 96, 0.12);
}

.search-bar button {
  padding: 12px 28px;
  border: none;
  border-radius: var(--radius-md);
  background: var(--gradient-accent);
  color: #fff;
  font-weight: 600;
  font-size: 1rem;
  font-family: inherit;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition);
}

.search-bar button:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(233, 69, 96, 0.35);
}

/* ===== Breadcrumb ===== */
.breadcrumb {
  max-width: 1200px;
  margin: 0 auto;
  padding: 16px 20px 0;
}

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

.breadcrumb li + li::before {
  content: '/';
  margin-right: 8px;
  color: var(--text-muted);
}

.breadcrumb a {
  color: var(--text-light);
}

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

/* ===== Hero ===== */
.hero {
  position: relative;
  max-width: 1200px;
  margin: 20px auto;
  padding: 0 20px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}

.hero-slider {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  aspect-ratio: 12 / 5;
  background: var(--gradient-hero);
}

.slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 0.8s ease, transform 0.8s ease;
  transform: scale(1.05);
}

.slide.active {
  opacity: 1;
  transform: scale(1);
}

.slide-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.slider-dots {
  position: absolute;
  bottom: 16px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 10px;
  z-index: 5;
}

.slider-dots button {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, 0.6);
  background: transparent;
  cursor: pointer;
  padding: 0;
  transition: all var(--transition);
}

.slider-dots button.active {
  background: var(--secondary);
  border-color: var(--secondary);
  width: 28px;
  border-radius: 6px;
}

.slider-dots button:hover {
  border-color: var(--secondary);
}

.hero-content h1 {
  margin-bottom: 16px;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-content > p {
  color: var(--text-light);
  font-size: 1rem;
  margin-bottom: 24px;
}

.hero-stats {
  display: flex;
  gap: 28px;
  margin-bottom: 28px;
  flex-wrap: wrap;
}

.stat-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.stat-number {
  font-size: 1.75rem;
  font-weight: 800;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1.2;
}

.stat-label {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.cta-btn {
  display: inline-block;
  padding: 14px 36px;
  background: var(--gradient-accent);
  color: #fff;
  font-weight: 700;
  font-size: 1rem;
  border-radius: var(--radius-xl);
  box-shadow: 0 8px 24px rgba(233, 69, 96, 0.3);
  transition: transform var(--transition), box-shadow var(--transition);
  position: relative;
  overflow: hidden;
}

.cta-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.3) 0%, transparent 50%);
  opacity: 0;
  transition: opacity var(--transition);
}

.cta-btn:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 14px 36px rgba(233, 69, 96, 0.45);
  color: #fff;
}

.cta-btn:hover::before {
  opacity: 1;
}

/* ===== Sections ===== */
.section {
  padding: 64px 0;
}

.section-alt {
  background: var(--bg-alt);
  transition: background var(--transition);
}

.section h2 {
  text-align: center;
  margin-bottom: 16px;
  position: relative;
  padding-bottom: 18px;
}

.section h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 4px;
  background: var(--gradient-accent);
  border-radius: 2px;
}

.section h3 {
  margin: 28px 0 14px;
}

.section-intro {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 40px;
  color: var(--text-light);
  font-size: 1.02rem;
}

/* ===== About ===== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 36px;
  margin-top: 36px;
}

.about-text h3 {
  color: var(--primary);
  margin-top: 24px;
}

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

.about-text p {
  color: var(--text-light);
  text-align: justify;
}

.timeline {
  position: relative;
  padding-left: 28px;
  margin: 16px 0;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 6px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: var(--gradient-accent);
  border-radius: 2px;
}

.timeline li {
  position: relative;
  padding: 6px 0 6px 4px;
  color: var(--text-light);
  font-size: 0.95rem;
}

.timeline li::before {
  content: '';
  position: absolute;
  left: -26px;
  top: 14px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--bg);
  border: 3px solid var(--primary);
  transition: transform var(--transition), background var(--transition);
}

.timeline li:hover::before {
  transform: scale(1.3);
  background: var(--secondary);
  border-color: var(--secondary);
}

.timeline strong {
  color: var(--primary);
  margin-right: 4px;
}

.about-sidebar {
  background: var(--glass-bg);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-md);
  height: fit-content;
  position: sticky;
  top: 90px;
  transition: background var(--transition), border-color var(--transition);
}

.about-sidebar h3 {
  margin-top: 0;
  color: var(--primary);
  padding-bottom: 12px;
  border-bottom: 2px solid var(--border);
}

.about-sidebar dl {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 10px 16px;
  font-size: 0.9rem;
}

.about-sidebar dt {
  color: var(--text-muted);
  font-weight: 500;
}

.about-sidebar dd {
  color: var(--text);
  font-weight: 600;
  word-break: break-all;
}

/* ===== Products ===== */
.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
  margin: 36px 0;
}

.product-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  position: relative;
  overflow: hidden;
}

.product-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}

.product-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}

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

.product-card svg {
  margin: 0 auto 18px;
  transition: transform 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.product-card:hover svg {
  transform: scale(1.12) rotate(-4deg);
}

.product-card h3 {
  margin: 0 0 10px;
  color: var(--text);
}

.product-card p {
  color: var(--text-light);
  font-size: 0.92rem;
  margin: 0;
  text-align: left;
}

/* ===== Advantages ===== */
.advantages {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  margin-top: 20px;
}

.adv-item {
  background: var(--bg-card);
  border-left: 4px solid var(--primary);
  border-radius: var(--radius-md);
  padding: 22px 24px;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.adv-item:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow-md);
  border-left-color: var(--secondary);
}

.adv-item h4 {
  color: var(--primary);
  margin-bottom: 8px;
  font-size: 1.05rem;
}

.adv-item p {
  color: var(--text-light);
  font-size: 0.9rem;
  margin: 0;
}

/* ===== Solutions ===== */
.solution-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
  margin: 36px 0;
}

.solution-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
  position: relative;
  overflow: hidden;
}

.solution-item::after {
  content: '';
  position: absolute;
  bottom: -40px;
  right: -40px;
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: var(--gradient-accent);
  opacity: 0.06;
  transition: transform var(--transition), opacity var(--transition);
}

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

.solution-item:hover::after {
  transform: scale(1.6);
  opacity: 0.12;
}

.solution-item h3 {
  margin-top: 0;
  color: var(--primary);
}

.solution-item p {
  color: var(--text-light);
  font-size: 0.92rem;
  margin: 0;
}

/* ===== Cases ===== */
.cases-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin: 36px 0;
}

.case-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
  transition: transform var(--transition), box-shadow var(--transition);
  position: relative;
}

.case-card::before {
  content: '"';
  position: absolute;
  top: 8px;
  right: 20px;
  font-size: 5rem;
  font-family: Georgia, serif;
  color: var(--primary);
  opacity: 0.1;
  line-height: 1;
}

.case-card:hover {
  transform: translateY(-6px) scale(1.01);
  box-shadow: var(--shadow-lg);
}

.case-card h3 {
  margin-top: 0;
  color: var(--text);
  font-size: 1.05rem;
}

.case-card p {
  color: var(--text-light);
  font-size: 0.9rem;
  margin: 0;
}

/* ===== Testimonials ===== */
.testimonials {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin-top: 20px;
}

.testimonials blockquote {
  background: var(--glass-bg);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  position: relative;
  transition: transform var(--transition), box-shadow var(--transition);
}

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

.testimonials blockquote::before {
  content: '';
  position: absolute;
  top: 0;
  left: 24px;
  width: 40px;
  height: 4px;
  background: var(--gradient-accent);
  border-radius: 0 0 4px 4px;
}

.testimonials p {
  color: var(--text-light);
  font-style: italic;
  font-size: 0.95rem;
  margin-bottom: 14px;
}

.testimonials cite {
  display: block;
  color: var(--primary);
  font-style: normal;
  font-weight: 600;
  font-size: 0.88rem;
}

/* ===== Articles ===== */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
  margin-top: 36px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 26px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  position: relative;
  overflow: hidden;
}

.article-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--gradient-accent);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform var(--transition);
}

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

.article-card:hover::before {
  transform: scaleY(1);
}

.article-card h3 {
  margin: 0 0 10px;
  font-size: 1.08rem;
  line-height: 1.4;
}

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

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

.article-card time {
  display: inline-block;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 12px;
  padding: 3px 10px;
  background: var(--bg-alt);
  border-radius: 20px;
}

.article-card p {
  color: var(--text-light);
  font-size: 0.88rem;
  flex: 1;
  margin-bottom: 16px;
}

.read-more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--primary);
  align-self: flex-start;
  transition: gap var(--transition), color var(--transition);
}

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

.read-more:hover {
  gap: 10px;
}

.read-more:hover::after {
  transform: translateX(3px);
}

/* ===== HowTo ===== */
.howto-content {
  max-width: 860px;
  margin: 0 auto;
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 36px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
}

.howto-content h3 {
  color: var(--primary);
  margin-top: 28px;
  padding-left: 14px;
  border-left: 4px solid var(--secondary);
}

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

.howto-content p {
  color: var(--text-light);
}

.howto-content ul,
.howto-content ol {
  padding-left: 24px;
  margin: 12px 0;
}

.howto-content ul li {
  position: relative;
  padding: 6px 0 6px 20px;
  color: var(--text-light);
  font-size: 0.94rem;
}

.howto-content ul li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 15px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--gradient-accent);
}

.howto-content ol {
  list-style: none;
  counter-reset: step;
}

.howto-content ol li {
  position: relative;
  padding: 10px 0 10px 44px;
  color: var(--text-light);
  font-size: 0.94rem;
  counter-increment: step;
  border-bottom: 1px dashed var(--border);
}

.howto-content ol li:last-child {
  border-bottom: none;
}

.howto-content ol li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 10px;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient-accent);
  color: #fff;
  font-weight: 700;
  font-size: 0.82rem;
  border-radius: 50%;
  box-shadow: 0 4px 10px rgba(233, 69, 96, 0.3);
}

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

/* ===== FAQ ===== */
.faq-list {
  max-width: 880px;
  margin: 36px auto 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

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

.faq-item:hover {
  box-shadow: var(--shadow-sm);
}

.faq-item[open] {
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
}

.faq-item summary {
  padding: 18px 52px 18px 22px;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.98rem;
  color: var(--text);
  position: relative;
  list-style: none;
  transition: color var(--transition), background var(--transition);
  user-select: none;
}

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

.faq-item summary::after {
  content: '+';
  position: absolute;
  right: 22px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.5rem;
  font-weight: 400;
  color: var(--primary);
  transition: transform var(--transition);
  line-height: 1;
}

.faq-item[open] summary::after {
  content: '−';
  transform: translateY(-50%) rotate(180deg);
}

.faq-item summary:hover {
  color: var(--primary);
  background: rgba(233, 69, 96, 0.04);
}

.faq-answer {
  padding: 0 22px 20px;
  animation: fadeIn 0.35s ease;
}

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

.faq-answer p {
  color: var(--text-light);
  font-size: 0.92rem;
  margin: 0;
  padding-top: 4px;
  border-top: 1px solid var(--border);
  padding-top: 16px;
}

/* ===== Contact ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 36px;
  margin-top: 36px;
}

.contact-info h3 {
  color: var(--primary);
  margin-top: 24px;
}

.contact-info h3:first-child {
  margin-top: 0;
}

.contact-info address {
  font-style: normal;
}

.contact-info address p {
  color: var(--text-light);
  font-size: 0.94rem;
  margin-bottom: 8px;
  padding-left: 4px;
}

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

.contact-info > p {
  color: var(--text-light);
  font-size: 0.94rem;
  text-align: justify;
}

.contact-form-area {
  background: var(--glass-bg);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-md);
  transition: background var(--transition), border-color var(--transition);
}

.contact-form-area h3 {
  margin-top: 0;
  color: var(--primary);
  margin-bottom: 20px;
}

.form-group {
  margin-bottom: 18px;
}

.form-group label {
  display: block;
  margin-bottom: 6px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  border: 2px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--bg-card);
  color: var(--text);
  font-size: 0.94rem;
  font-family: inherit;
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
  resize: vertical;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(233, 69, 96, 0.12);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--text-muted);
}

.contact-form-area button[type="submit"] {
  width: 100%;
  padding: 14px;
  border: none;
  border-radius: var(--radius-md);
  background: var(--gradient-accent);
  color: #fff;
  font-size: 1rem;
  font-weight: 700;
  font-family: inherit;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition);
}

.contact-form-area button[type="submit"]:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 28px rgba(233, 69, 96, 0.4);
}

.contact-form-area button[type="submit"]:active {
  transform: translateY(0);
}

/* ===== Sitemap ===== */
.sitemap-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 12px;
  margin: 28px 0 36px;
}

.sitemap-list li a {
  display: block;
  padding: 12px 18px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-light);
  font-size: 0.9rem;
  font-weight: 500;
  text-align: center;
  transition: all var(--transition);
}

.sitemap-list li a:hover {
  background: var(--gradient-accent);
  color: #fff;
  border-color: transparent;
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(233, 69, 96, 0.3);
}

.friend-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 16px;
}

.friend-links li a {
  display: inline-block;
  padding: 8px 18px;
  background: var(--bg-alt);
  border-radius: 20px;
  color: var(--text-light);
  font-size: 0.85rem;
  transition: all var(--transition);
}

.friend-links li a:hover {
  background: var(--primary);
  color: #fff;
  transform: translateY(-2px);
}

/* ===== Legal ===== */
#legal h3 {
  color: var(--primary);
  margin-top: 24px;
  padding-left: 14px;
  border-left: 4px solid var(--secondary);
}

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

#legal p {
  color: var(--text-light);
  font-size: 0.94rem;
  text-align: justify;
}

/* ===== Footer ===== */
footer {
  background: var(--gradient-hero);
  color: #c8cbe0;
  padding: 56px 0 0;
  margin-top: 0;
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px 40px;
  display: grid;
  grid-template-columns: 2fr 1fr 1.2fr 1fr;
  gap: 36px;
}

.footer-col h3 {
  color: #fff;
  font-size: 1.05rem;
  margin-bottom: 16px;
  position: relative;
  padding-bottom: 10px;
}

.footer-col h3::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 32px;
  height: 3px;
  background: var(--gradient-accent);
  border-radius: 2px;
}

.footer-col p {
  font-size: 0.88rem;
  line-height: 1.8;
  color: #a8abc4;
  margin-bottom: 8px;
}

.footer-col ul li {
  margin-bottom: 10px;
}

.footer-col ul li a {
  color: #a8abc4;
  font-size: 0.88rem;
  transition: color var(--transition), padding-left var(--transition);
  position: relative;
}

.footer-col ul li a::before {
  content: '›';
  position: absolute;
  left: -14px;
  opacity: 0;
  transition: opacity var(--transition), left var(--transition);
}

.footer-col ul li a:hover {
  color: var(--secondary);
  padding-left: 6px;
}

.footer-col ul li a:hover::before {
  opacity: 1;
  left: -8px;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 24px 20px;
  text-align: center;
  max-width: 1200px;
  margin: 0 auto;
}

.footer-bottom p {
  font-size: 0.82rem;
  color: #888ba8;
  margin-bottom: 6px;
}

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

/* ===== Back To Top ===== */
#backToTop {
  position: fixed;
  bottom: 28px;
  right: 28px;
  width: 48px;
  height: 48px;
  border: none;
  border-radius: 50%;
  background: var(--gradient-accent);
  color: #fff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 8px 24px rgba(233, 69, 96, 0.4);
  z-index: 900;
  transition: transform var(--transition), box-shadow var(--transition), opacity var(--transition);
  animation: popIn 0.3s ease;
}

@keyframes popIn {
  from { opacity: 0; transform: scale(0.5) translateY(20px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}

#backToTop:hover {
  transform: translateY(-4px) scale(1.08);
  box-shadow: 0 14px 36px rgba(233, 69, 96, 0.55);
}

#backToTop:active {
  transform: scale(0.95);
}

/* ===== Scroll Reveal ===== */
.reveal {
  opacity: 0;
  transform: translateY(36px);
  transition: opacity 0.7s ease, transform 0.7s ease;
  will-change: opacity, transform;
}

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

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .hero {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .hero-slider {
    aspect-ratio: 16 / 7;
  }

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

  .about-sidebar {
    position: static;
  }

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

  .footer-inner {
    grid-template-columns: 1fr 1fr;
    gap: 28px;
  }
}

@media (max-width: 768px) {
  html {
    font-size: 15px;
  }

  .header-inner {
    height: 60px;
  }

  #mainNav {
    position: fixed;
    top: 60px;
    left: 0;
    right: 0;
    background: var(--glass-bg);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--glass-border);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, padding 0.4s ease;
    box-shadow: var(--shadow-md);
  }

  #mainNav.open {
    max-height: 520px;
    padding: 12px 0;
  }

  #mainNav ul {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 0 16px;
  }

  #mainNav a {
    padding: 13px 16px;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
  }

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

  #mobileMenuBtn {
    display: flex;
  }

  .hero {
    margin: 12px auto;
    padding: 0 16px;
  }

  .hero-slider {
    aspect-ratio: 16 / 9;
    border-radius: var(--radius-lg);
  }

  .hero-stats {
    gap: 20px;
  }

  .stat-number {
    font-size: 1.45rem;
  }

  .section {
    padding: 44px 0;
  }

  .container {
    padding: 0 16px;
  }

  .product-grid,
  .solution-list,
  .cases-grid,
  .testimonials,
  .articles-grid {
    grid-template-columns: 1fr;
  }

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

  .howto-content {
    padding: 24px 20px;
  }

  .contact-form-area {
    padding: 24px 20px;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 24px;
    padding-bottom: 28px;
  }

  .sitemap-list {
    grid-template-columns: 1fr 1fr;
  }

  #backToTop {
    bottom: 20px;
    right: 20px;
    width: 42px;
    height: 42px;
  }

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

  .search-bar button {
    width: 100%;
  }
}

@media (max-width: 480px) {
  .logo span {
    font-size: 1rem;
  }

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

  .hero-content h1 {
    font-size: 1.5rem;
  }

  .hero-stats {
    gap: 16px;
  }

  .stat-number {
    font-size: 1.25rem;
  }

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

  .cta-btn {
    width: 100%;
    text-align: center;
    padding: 13px 24px;
  }

  .about-sidebar {
    padding: 22px 18px;
  }

  .about-sidebar dl {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .about-sidebar dt {
    margin-top: 8px;
  }

  .product-card {
    padding: 26px 20px;
  }

  .faq-item summary {
    padding: 15px 44px 15px 18px;
    font-size: 0.92rem;
  }

  .faq-answer {
    padding: 0 18px 18px;
  }

  .sitemap-list {
    grid-template-columns: 1fr;
  }

  .friend-links {
    gap: 8px;
  }
}

/* ===== Reduced Motion ===== */
@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;
  }
}

/* ===== Print ===== */
@media print {
  #siteHeader,
  #backToTop,
  .search-bar,
  .header-actions {
    display: none !important;
  }

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

  .section {
    padding: 20px 0;
  }
}