/* ===== CSS Reset & Base ===== */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
  background: var(--bg-dark);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
  transition: background 0.3s ease, color 0.3s ease;
}
a {
  color: var(--primary);
  text-decoration: none;
  transition: color var(--transition);
}
a:hover {
  color: var(--primary-dark);
}
img {
  max-width: 100%;
  height: auto;
  display: block;
}
ul, ol {
  padding-left: 1.5em;
}
button {
  cursor: pointer;
  font-family: inherit;
}

/* ===== CSS Custom Properties ===== */
:root {
  --primary: #00d4aa;
  --primary-dark: #00b894;
  --primary-glow: rgba(0,212,170,0.3);
  --bg-dark: #0f0f1a;
  --bg-card: #1a1a2e;
  --bg-card-hover: #252540;
  --text-primary: #f0f0f5;
  --text-secondary: #a0a0b8;
  --text-muted: #6c6c8a;
  --shadow: 0 8px 32px rgba(0,0,0,0.3);
  --shadow-hover: 0 12px 40px rgba(0,0,0,0.4);
  --radius: 16px;
  --radius-sm: 8px;
  --radius-lg: 24px;
  --transition: 0.3s ease;
  --transition-slow: 0.5s ease;
  --max-width: 1200px;
  --header-height: 70px;
  --glass-bg: rgba(15,15,26,0.85);
  --glass-border: rgba(255,255,255,0.08);
  --glass-shadow: 0 8px 32px rgba(0,0,0,0.25);
  --gradient-primary: linear-gradient(135deg, #00d4aa, #00f5d4);
  --gradient-hero: linear-gradient(135deg, #0f0f1a 0%, #1a1a2e 50%, #0d1b2a 100%);
  --gradient-section: linear-gradient(180deg, #0f0f1a 0%, #1a1a2e 100%);
  --gradient-section-reverse: linear-gradient(180deg, #1a1a2e 0%, #0f0f1a 100%);
  --scrollbar-thumb: #2a2a45;
  --scrollbar-track: #1a1a2e;
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar {
  width: 8px;
}
::-webkit-scrollbar-track {
  background: var(--scrollbar-track);
}
::-webkit-scrollbar-thumb {
  background: var(--scrollbar-thumb);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* ===== Container ===== */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  width: 100%;
}

/* ===== Glass Effect Utility ===== */
.glass {
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
}

/* ===== Header / Navigation ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--glass-border);
  height: var(--header-height);
  transition: background var(--transition), backdrop-filter var(--transition);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-primary);
  user-select: none;
}
.logo svg {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
  filter: drop-shadow(0 0 8px rgba(0,212,170,0.2));
}
.logo span {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.main-nav {
  display: flex;
  align-items: center;
  gap: 32px;
}
.main-nav a {
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
  position: relative;
  padding: 4px 0;
  transition: color var(--transition);
}
.main-nav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: width var(--transition);
  border-radius: 1px;
}
.main-nav a:hover::after,
.main-nav a.active::after {
  width: 100%;
}
.main-nav a:hover,
.main-nav a.active {
  color: var(--text-primary);
}
.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.6rem;
  cursor: pointer;
  padding: 4px;
  transition: transform 0.2s ease;
}
.nav-toggle:hover {
  transform: scale(1.1);
}
.theme-toggle {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 1.2rem;
  cursor: pointer;
  padding: 4px 8px;
  transition: color var(--transition), transform 0.2s ease;
}
.theme-toggle:hover {
  color: var(--text-primary);
  transform: scale(1.1);
}

/* ===== Hero Section ===== */
.hero {
  padding: 140px 0 80px;
  background: var(--gradient-hero);
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: -30%;
  right: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(0,212,170,0.1) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
  animation: heroGlow 8s ease-in-out infinite alternate;
}
.hero::after {
  content: '';
  position: absolute;
  bottom: -20%;
  left: -5%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(0,245,212,0.06) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
  animation: heroGlow2 10s ease-in-out infinite alternate;
}
@keyframes heroGlow {
  0% { transform: translate(0, 0) scale(1); opacity: 0.8; }
  100% { transform: translate(-40px, 30px) scale(1.1); opacity: 1; }
}
@keyframes heroGlow2 {
  0% { transform: translate(0, 0) scale(1); opacity: 0.5; }
  100% { transform: translate(30px, -20px) scale(1.2); opacity: 0.8; }
}
.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  position: relative;
  z-index: 1;
}
.hero-content h1 {
  font-size: 3rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 20px;
  background: linear-gradient(135deg, #fff 20%, var(--primary) 80%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: fadeInUp 0.8s ease;
}
.hero-content p {
  font-size: 1.15rem;
  color: var(--text-secondary);
  margin-bottom: 32px;
  max-width: 520px;
  animation: fadeInUp 0.8s ease 0.1s both;
}
.hero-buttons {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  animation: fadeInUp 0.8s ease 0.2s both;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 50px;
  font-weight: 600;
  font-size: 1rem;
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.btn-primary {
  background: var(--gradient-primary);
  color: #0f0f1a;
  box-shadow: 0 4px 16px rgba(0,212,170,0.2);
}
.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 28px rgba(0,212,170,0.35);
}
.btn-primary:active {
  transform: translateY(-1px);
}
.btn-outline {
  background: transparent;
  border: 2px solid var(--primary);
  color: var(--primary);
  box-shadow: none;
}
.btn-outline:hover {
  background: var(--primary);
  color: #0f0f1a;
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(0,212,170,0.2);
}
.btn-outline:active {
  transform: translateY(-1px);
}
.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
  animation: fadeInUp 0.8s ease 0.3s both;
}
.hero-card {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-radius: var(--radius);
  padding: 32px;
  width: 100%;
  max-width: 420px;
  box-shadow: var(--glass-shadow);
  border: 1px solid var(--glass-border);
  transition: transform var(--transition), box-shadow var(--transition);
}
.hero-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0,0,0,0.35);
}
.hero-card .stat-row {
  display: flex;
  justify-content: space-between;
  padding: 12px 0;
  border-bottom: 1px solid rgba(255,255,255,0.05);
  transition: background 0.2s ease;
}
.hero-card .stat-row:hover {
  background: rgba(255,255,255,0.03);
  border-radius: 4px;
}
.hero-card .stat-row:last-child {
  border-bottom: none;
}
.hero-card .stat-label {
  color: var(--text-secondary);
  font-size: 0.9rem;
}
.hero-card .stat-value {
  color: var(--primary);
  font-weight: 700;
  font-size: 1.05rem;
}
.hero-card .live-badge {
  display: inline-block;
  background: #e74c3c;
  color: #fff;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  animation: pulse 2s infinite;
  box-shadow: 0 0 12px rgba(231,76,60,0.3);
}
@keyframes pulse {
  0%,100% { opacity: 1; }
  50% { opacity: 0.6; }
}

/* ===== Animations ===== */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* ===== Section Common ===== */
section {
  padding: 80px 0;
}
.section-label {
  display: inline-block;
  color: var(--primary);
  font-weight: 600;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 12px;
  position: relative;
}
.section-label::after {
  content: '';
  display: block;
  width: 40px;
  height: 2px;
  background: var(--primary);
  margin: 8px auto 0;
  border-radius: 1px;
}
.text-center .section-label::after {
  margin-left: auto;
  margin-right: auto;
}
.section-title {
  font-size: 2.2rem;
  font-weight: 700;
  margin-bottom: 16px;
  line-height: 1.25;
}
.section-desc {
  color: var(--text-secondary);
  font-size: 1.05rem;
  max-width: 680px;
  margin-bottom: 48px;
  line-height: 1.6;
}
.text-center {
  text-align: center;
}
.mx-auto {
  margin-left: auto;
  margin-right: auto;
}

/* ===== About Section ===== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.about-text h3 {
  font-size: 1.5rem;
  margin-bottom: 16px;
  color: var(--text-primary);
}
.about-text p {
  color: var(--text-secondary);
  margin-bottom: 16px;
  line-height: 1.7;
}
.about-stats {
  display: grid;
  grid-template-columns: repeat(2,1fr);
  gap: 24px;
}
.stat-card {
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  padding: 28px 24px;
  text-align: center;
  border: 1px solid rgba(255,255,255,0.05);
  transition: all var(--transition);
}
.stat-card:hover {
  transform: translateY(-4px);
  background: var(--bg-card-hover);
  box-shadow: var(--shadow);
}
.stat-card .number {
  font-size: 2.4rem;
  font-weight: 800;
  color: var(--primary);
  line-height: 1;
}
.stat-card .label {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-top: 8px;
}

/* ===== Services Section ===== */
#services {
  background: var(--gradient-section);
}
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}
.service-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 32px;
  transition: all var(--transition);
  border: 1px solid rgba(255,255,255,0.05);
  position: relative;
  overflow: hidden;
}
.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, transparent, rgba(0,212,170,0.03));
  opacity: 0;
  transition: opacity var(--transition);
}
.service-card:hover::before {
  opacity: 1;
}
.service-card:hover {
  transform: translateY(-6px);
  background: var(--bg-card-hover);
  box-shadow: var(--shadow-hover);
}
.service-card .icon {
  font-size: 2.4rem;
  margin-bottom: 16px;
  display: inline-block;
  transition: transform var(--transition);
}
.service-card:hover .icon {
  transform: scale(1.1);
}
.service-card h3 {
  font-size: 1.2rem;
  margin-bottom: 12px;
  position: relative;
  z-index: 1;
}
.service-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  position: relative;
  z-index: 1;
}

/* ===== Advantages Section ===== */
.advantages-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
}
.advantage-item {
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  padding: 24px;
  border-left: 4px solid var(--primary);
  transition: all var(--transition);
}
.advantage-item:hover {
  transform: translateX(4px);
  background: var(--bg-card-hover);
  box-shadow: var(--shadow);
}
.advantage-item h4 {
  margin-bottom: 8px;
  font-size: 1.05rem;
}
.advantage-item p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* ===== Testimonials Section ===== */
#testimonials {
  background: var(--gradient-section-reverse);
}
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}
.testimonial-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 28px;
  border: 1px solid rgba(255,255,255,0.05);
  transition: all var(--transition);
}
.testimonial-card:hover {
  transform: translateY(-4px);
  background: var(--bg-card-hover);
  box-shadow: var(--shadow);
}
.testimonial-card .quote {
  color: var(--text-secondary);
  font-style: italic;
  margin-bottom: 16px;
  line-height: 1.6;
  position: relative;
  padding-left: 20px;
}
.testimonial-card .quote::before {
  content: '"';
  position: absolute;
  left: 0;
  top: -4px;
  font-size: 1.8rem;
  color: var(--primary);
  font-style: normal;
  line-height: 1;
}
.testimonial-card .author {
  font-weight: 600;
  color: var(--primary);
}
.testimonial-card .role {
  color: var(--text-muted);
  font-size: 0.85rem;
  margin-top: 2px;
}

/* ===== Case Studies ===== */
.cases-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}
.case-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 28px;
  border: 1px solid rgba(255,255,255,0.05);
  transition: all var(--transition);
}
.case-card:hover {
  transform: translateY(-4px);
  background: var(--bg-card-hover);
  box-shadow: var(--shadow);
}
.case-card h4 {
  margin-bottom: 8px;
  font-size: 1.1rem;
}
.case-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.6;
}
.case-card .tag {
  display: inline-block;
  background: rgba(0,212,170,0.15);
  color: var(--primary);
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.75rem;
  margin-top: 12px;
  font-weight: 500;
  transition: background var(--transition);
}
.case-card:hover .tag {
  background: rgba(0,212,170,0.25);
}

/* ===== Knowledge Center / Insights ===== */
#insights {
  background: var(--gradient-section);
}
.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}
.article-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 28px;
  border: 1px solid rgba(255,255,255,0.05);
  transition: all var(--transition);
}
.article-card:hover {
  transform: translateY(-4px);
  background: var(--bg-card-hover);
  box-shadow: var(--shadow);
}
.article-card .date {
  color: var(--text-muted);
  font-size: 0.8rem;
  margin-bottom: 8px;
  font-weight: 500;
}
.article-card h4 {
  font-size: 1.1rem;
  margin-bottom: 8px;
  line-height: 1.4;
}
.article-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 12px;
  line-height: 1.6;
}
.article-card .read-more {
  color: var(--primary);
  font-weight: 600;
  font-size: 0.9rem;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: gap var(--transition);
}
.article-card .read-more:hover {
  gap: 8px;
}

/* ===== Search Box ===== */
.search-box {
  display: flex;
  align-items: center;
  background: var(--bg-card);
  border-radius: 50px;
  padding: 8px 16px;
  border: 1px solid rgba(255,255,255,0.1);
  max-width: 320px;
  margin: 0 auto 40px;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.search-box:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 20px rgba(0,212,170,0.1);
}
.search-box input {
  background: none;
  border: none;
  color: var(--text-primary);
  padding: 8px;
  width: 100%;
  font-size: 0.95rem;
}
.search-box input::placeholder {
  color: var(--text-muted);
}
.search-box input:focus {
  outline: none;
}
.search-box button {
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 1.1rem;
  padding: 4px;
  transition: color var(--transition), transform 0.2s ease;
}
.search-box button:hover {
  color: var(--primary);
  transform: scale(1.1);
}

/* ===== Banner Carousel ===== */
.banner-carousel {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  max-width: 900px;
  margin: 0 auto 60px;
  box-shadow: var(--shadow);
}
.carousel-track {
  display: flex;
  transition: transform 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}
.carousel-slide {
  min-width: 100%;
  padding: 60px 40px;
  background: linear-gradient(135deg, #1a1a2e, #16213e);
  text-align: center;
}
.carousel-slide h3 {
  font-size: 1.6rem;
  margin-bottom: 12px;
  color: var(--text-primary);
}
.carousel-slide p {
  color: var(--text-secondary);
  max-width: 500px;
  margin: 0 auto;
  line-height: 1.6;
}
.carousel-nav {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-top: 20px;
  padding-bottom: 20px;
}
.carousel-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--text-muted);
  border: none;
  cursor: pointer;
  transition: background var(--transition), transform 0.2s ease;
}
.carousel-dot.active {
  background: var(--primary);
  transform: scale(1.2);
}
.carousel-dot:hover {
  background: var(--primary-dark);
}

/* ===== FAQ Section ===== */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}
.faq-item {
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
  border: 1px solid rgba(255,255,255,0.05);
  overflow: hidden;
  transition: border-color var(--transition);
}
.faq-item.open {
  border-color: var(--primary);
}
.faq-question {
  padding: 20px 24px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
  font-size: 1rem;
  transition: background var(--transition);
  user-select: none;
}
.faq-question:hover {
  background: var(--bg-card-hover);
}
.faq-question .arrow {
  transition: transform 0.3s ease;
  font-size: 1.2rem;
  color: var(--text-muted);
}
.faq-item.open .faq-question .arrow {
  transform: rotate(180deg);
  color: var(--primary);
}
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s ease;
  padding: 0 24px;
  color: var(--text-secondary);
  line-height: 1.6;
}
.faq-item.open .faq-answer {
  max-height: 400px;
  padding: 0 24px 20px;
}

/* ===== HowTo Section ===== */
#howto {
  background: var(--gradient-section-reverse);
}
.howto-steps {
  max-width: 700px;
  margin: 0 auto;
}
.howto-step {
  display: flex;
  gap: 20px;
  margin-bottom: 28px;
  transition: transform var(--transition);
}
.howto-step:hover {
  transform: translateX(4px);
}
.howto-step .step-num {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  background: var(--gradient-primary);
  color: #0f0f1a;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.1rem;
  box-shadow: 0 4px 12px rgba(0,212,170,0.2);
}
.howto-step .step-content h4 {
  margin-bottom: 6px;
  font-size: 1.05rem;
}
.howto-step .step-content p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* ===== Contact Section ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}
.contact-info h3 {
  margin-bottom: 20px;
  font-size: 1.3rem;
}
.contact-info p {
  color: var(--text-secondary);
  margin-bottom: 12px;
}
.contact-info .detail {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  margin-bottom: 16px;
}
.contact-info .detail .label {
  color: var(--text-muted);
  min-width: 80px;
  font-weight: 500;
}
.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 14px 16px;
  background: var(--bg-card);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 1rem;
  transition: border var(--transition), box-shadow var(--transition);
  margin-bottom: 16px;
  font-family: inherit;
}
.contact-form input:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 20px rgba(0,212,170,0.08);
}
.contact-form textarea {
  min-height: 120px;
  resize: vertical;
}
.contact-form .btn {
  width: 100%;
  justify-content: center;
}

/* ===== Footer ===== */
.site-footer {
  background: #0a0a14;
  border-top: 1px solid rgba(255,255,255,0.05);
  padding: 60px 0 30px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-col h4 {
  margin-bottom: 16px;
  font-size: 1rem;
  color: var(--text-primary);
}
.footer-col p,
.footer-col a {
  color: var(--text-secondary);
  font-size: 0.9rem;
  display: block;
  margin-bottom: 8px;
  transition: color var(--transition);
}
.footer-col a:hover {
  color: var(--primary);
}
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.05);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.85rem;
  color: var(--text-muted);
}
.footer-bottom a {
  color: var(--text-muted);
  transition: color var(--transition);
}
.footer-bottom a:hover {
  color: var(--primary);
}

/* ===== Back to Top ===== */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 48px;
  height: 48px;
  background: var(--gradient-primary);
  color: #0f0f1a;
  border: none;
  border-radius: 50%;
  font-size: 1.4rem;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
  z-index: 50;
  box-shadow: 0 4px 16px rgba(0,212,170,0.3);
  display: flex;
  align-items: center;
  justify-content: center;
}
.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}
.back-to-top:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0,212,170,0.4);
}
.back-to-top:active {
  transform: translateY(-2px);
}

/* ===== Responsive Design ===== */
@media (max-width: 1024px) {
  .hero-grid {
    gap: 40px;
  }
  .hero-content h1 {
    font-size: 2.6rem;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}
@media (max-width: 768px) {
  .main-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--bg-dark);
    flex-direction: column;
    padding: 24px;
    gap: 20px;
    transform: translateY(-120%);
    transition: transform 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    border-bottom: 1px solid rgba(255,255,255,0.05);
    z-index: 99;
    max-height: calc(100vh - var(--header-height));
    overflow-y: auto;
  }
  .main-nav.open {
    transform: translateY(0);
  }
  .nav-toggle {
    display: block;
  }
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .hero-content h1 {
    font-size: 2.2rem;
  }
  .hero-content p {
    font-size: 1rem;
  }
  .about-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 24px;
  }
  .section-title {
    font-size: 1.8rem;
  }
  section {
    padding: 60px 0;
  }
  .hero {
    padding: 120px 0 60px;
  }
  .carousel-slide {
    padding: 40px 24px;
  }
  .carousel-slide h3 {
    font-size: 1.3rem;
  }
}
@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }
  .section-title {
    font-size: 1.6rem;
  }
  .hero-content h1 {
    font-size: 1.8rem;
  }
  .btn {
    padding: 12px 24px;
    font-size: 0.9rem;
  }
  .hero-card {
    padding: 24px;
  }
  .stat-card {
    padding: 20px 16px;
  }
  .stat-card .number {
    font-size: 2rem;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 44px;
    height: 44px;
    font-size: 1.2rem;
  }
  .testimonials-grid {
    grid-template-columns: 1fr;
  }
  .services-grid {
    grid-template-columns: 1fr;
  }
  .advantages-list {
    grid-template-columns: 1fr;
  }
  .cases-grid {
    grid-template-columns: 1fr;
  }
  .articles-grid {
    grid-template-columns: 1fr;
  }
}

/* ===== Light Mode Override ===== */
body.light-mode {
  --bg-dark: #f5f5fa;
  --bg-card: #ffffff;
  --bg-card-hover: #f0f0f5;
  --text-primary: #1a1a2e;
  --text-secondary: #4a4a6a;
  --text-muted: #8a8aaa;
  --shadow: 0 8px 32px rgba(0,0,0,0.08);
  --shadow-hover: 0 12px 40px rgba(0,0,0,0.12);
  --glass-bg: rgba(245,245,250,0.85);
  --glass-border: rgba(0,0,0,0.06);
  --scrollbar-thumb: #c0c0d0;
  --scrollbar-track: #e8e8f0;
  --gradient-hero: linear-gradient(135deg, #f5f5fa 0%, #e8e8f0 50%, #dcdce8 100%);
  --gradient-section: linear-gradient(180deg, #f5f5fa 0%, #e8e8f0 100%);
  --gradient-section-reverse: linear-gradient(180deg, #e8e8f0 0%, #f5f5fa 100%);
}
body.light-mode .site-header {
  background: var(--glass-bg);
  border-bottom: 1px solid var(--glass-border);
}
body.light-mode .hero::before {
  background: radial-gradient(circle, rgba(0,212,170,0.12) 0%, transparent 70%);
}
body.light-mode .hero::after {
  background: radial-gradient(circle, rgba(0,245,212,0.08) 0%, transparent 70%);
}
body.light-mode .hero-content h1 {
  background: linear-gradient(135deg, #1a1a2e 20%, #00b894 80%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
body.light-mode .btn-primary {
  color: #fff;
}
body.light-mode .btn-outline {
  color: #00b894;
  border-color: #00b894;
}
body.light-mode .btn-outline:hover {
  color: #fff;
  background: #00b894;
}
body.light-mode .site-footer {
  background: #e8e8f0;
  border-top: 1px solid rgba(0,0,0,0.06);
}
body.light-mode .carousel-slide {
  background: linear-gradient(135deg, #ffffff, #f0f0f5);
}
body.light-mode .carousel-slide h3 {
  color: var(--text-primary);
}
body.light-mode .carousel-slide p {
  color: var(--text-secondary);
}
body.light-mode .hero-card .stat-row {
  border-bottom: 1px solid rgba(0,0,0,0.05);
}
body.light-mode .hero-card .stat-row:hover {
  background: rgba(0,0,0,0.02);
}
body.light-mode .stat-card,
body.light-mode .service-card,
body.light-mode .testimonial-card,
body.light-mode .case-card,
body.light-mode .article-card,
body.light-mode .faq-item,
body.light-mode .advantage-item,
body.light-mode .howto-step .step-content p {
  border-color: rgba(0,0,0,0.06);
}
body.light-mode .search-box {
  border-color: rgba(0,0,0,0.1);
}
body.light-mode .contact-form input,
body.light-mode .contact-form textarea {
  border-color: rgba(0,0,0,0.1);
  background: #ffffff;
}
body.light-mode .contact-form input:focus,
body.light-mode .contact-form textarea:focus {
  border-color: var(--primary);
}

/* ===== Scroll Animation (IntersectionObserver will add class) ===== */
.scroll-animate {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.scroll-animate.animate {
  opacity: 1;
  transform: translateY(0);
}

/* ===== Selection ===== */
::selection {
  background: var(--primary);
  color: #0f0f1a;
}

/* ===== Focus visible ===== */
:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

/* ===== Print ===== */
@media print {
  .site-header,
  .back-to-top,
  .nav-toggle,
  .theme-toggle,
  .search-box,
  .banner-carousel,
  .carousel-nav {
    display: none !important;
  }
  body {
    background: #fff;
    color: #000;
  }
  .container {
    max-width: 100%;
    padding: 0;
  }
  section {
    padding: 40px 0;
    page-break-inside: avoid;
  }
}