:root {
  --bg: #f8fafc;
  --bg-white: #ffffff;
  --bg-dark: #0f172a;
  --text: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #3b82f6;
  --primary-bg: #eff6ff;
  --accent: #f59e0b;
  --accent-dark: #d97706;
  --gradient: linear-gradient(135deg, #1e40af 0%, #2563eb 45%, #f59e0b 100%);
  --gradient-text: linear-gradient(135deg, #1d4ed8, #2563eb, #f59e0b);
  --border: #e2e8f0;
  --shadow: 0 1px 3px rgba(0,0,0,0.06), 0 8px 24px rgba(0,0,0,0.04);
  --shadow-lg: 0 20px 50px rgba(37,99,235,0.12);
  --radius: 12px;
  --radius-lg: 16px;
  --max: 1180px;
  --font: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }

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

/* ===== HEADER ===== */
.header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s, box-shadow 0.3s;
}

.header.scrolled {
  border-color: var(--border);
  box-shadow: 0 1px 8px rgba(0,0,0,0.04);
}

.header-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text);
}

.logo-icon {
  width: 36px; height: 36px;
  background: var(--gradient);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1rem;
  font-weight: 700;
}

.nav { display: flex; align-items: center; gap: 32px; }

.nav-link {
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: color 0.2s;
  cursor: pointer;
}

.nav-link:hover, .nav-link.active { color: var(--primary); }

.nav-cta {
  padding: 8px 20px;
  background: var(--primary);
  color: white !important;
  border-radius: 8px;
  font-size: 0.875rem;
  font-weight: 500;
  transition: background 0.2s, transform 0.2s;
}

.nav-cta:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text);
}

/* ===== HERO ===== */
.hero {
  padding: 140px 0 100px;
  position: relative;
  overflow: hidden;
  background: var(--bg-white);
}

.hero-bg {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}

.hero-bg-blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
}

.hero-bg-blob-1 {
  width: 500px; height: 500px;
  background: rgba(37,99,235,0.08);
  top: -100px; right: -100px;
}

.hero-bg-blob-2 {
  width: 400px; height: 400px;
  background: rgba(245,158,11,0.07);
  bottom: -100px; left: -50px;
}

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

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px 6px 8px;
  background: var(--primary-bg);
  border: 1px solid rgba(37,99,235,0.15);
  border-radius: 100px;
  font-size: 0.8rem;
  color: var(--primary);
  font-weight: 500;
  margin-bottom: 24px;
}

.hero-badge-dot {
  width: 8px; height: 8px;
  background: var(--primary);
  border-radius: 50%;
  animation: blink 2s ease-in-out infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.hero-title {
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 24px;
  letter-spacing: -0.02em;
}

.hero-title .highlight {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.85;
  margin-bottom: 36px;
  max-width: 520px;
}

.hero-btns { display: flex; gap: 14px; flex-wrap: wrap; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.25s;
  border: none;
}

.btn-primary {
  background: var(--primary);
  color: white;
  box-shadow: 0 4px 14px rgba(37,99,235,0.35);
}

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(37,99,235,0.4);
}

.btn-outline {
  background: white;
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-outline:hover {
  border-color: var(--primary);
  color: var(--primary);
}

/* Hero floating cards */
.hero-cards {
  position: relative;
  height: 420px;
}

.float-card {
  position: absolute;
  background: white;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 14px;
  animation: float 6s ease-in-out infinite;
}

.float-card-1 {
  top: 20px; right: 20px;
  animation-delay: 0s;
}

.float-card-2 {
  bottom: 60px; left: 0;
  animation-delay: -3s;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

.float-card-icon {
  width: 44px; height: 44px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  font-weight: 700;
  flex-shrink: 0;
}

.float-card-icon.blue { background: var(--primary-bg); color: var(--primary); }
.float-card-icon.cyan { background: #ecfeff; color: #0891b2; }

.float-card-text strong {
  display: block;
  font-size: 0.95rem;
  margin-bottom: 2px;
}

.float-card-text span {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.hero-main-card {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  width: 280px;
  background: white;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-lg);
  text-align: center;
}

.hero-main-card-icon {
  width: 64px; height: 64px;
  background: var(--gradient);
  border-radius: 16px;
  margin: 0 auto 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.5rem;
  font-weight: 700;
}

.hero-main-card h3 {
  font-size: 1.1rem;
  margin-bottom: 8px;
}

.hero-main-card p {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ===== SECTION ===== */
.section { padding: 100px 0; }
.section-gray { background: var(--bg); }

.section-head {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 56px;
}

.section-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 700;
  margin-bottom: 16px;
  letter-spacing: -0.01em;
}

.section-desc {
  color: var(--text-secondary);
  line-height: 1.85;
}

/* ===== SERVICE CARDS ===== */
.services-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.service-card {
  background: white;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: all 0.3s;
  cursor: default;
}

.service-card:hover {
  border-color: rgba(37,99,235,0.2);
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.service-icon {
  width: 48px; height: 48px;
  background: var(--primary-bg);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 20px;
}

.service-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.service-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 20px;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  padding: 4px 12px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.75rem;
  color: var(--text-secondary);
  font-weight: 500;
}

/* ===== ABOUT ===== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.about-text p {
  color: var(--text-secondary);
  margin-bottom: 18px;
  line-height: 1.9;
}

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

.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.stats-grid.stats-4 {
  grid-template-columns: repeat(4, 1fr);
}

.stat-box {
  background: white;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  text-align: center;
  transition: box-shadow 0.3s;
}

.stat-box:hover { box-shadow: var(--shadow); }

.stat-num {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--primary);
  line-height: 1;
  margin-bottom: 8px;
}

.stat-num .unit {
  font-size: 1.2rem;
  font-weight: 600;
}

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

/* ===== TAG CLOUD ===== */
.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
}

.tag-cloud-item {
  padding: 10px 20px;
  background: white;
  border: 1px solid var(--border);
  border-radius: 100px;
  font-size: 0.875rem;
  color: var(--text-secondary);
  transition: all 0.25s;
  cursor: default;
}

.tag-cloud-item:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--primary-bg);
}

/* ===== VALUES ===== */
.values-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.value-card {
  text-align: center;
  padding: 40px 28px;
  background: white;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: all 0.3s;
}

.value-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.value-icon {
  width: 56px; height: 56px;
  background: var(--gradient);
  border-radius: 14px;
  margin: 0 auto 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.4rem;
}

.value-card h3 {
  font-size: 1.1rem;
  margin-bottom: 10px;
}

.value-card p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.75;
}

/* ===== PRODUCT SHOWCASE ===== */
.product-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.product-card {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform 0.3s, box-shadow 0.3s;
}

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

.product-img-wrap {
  position: relative;
  aspect-ratio: 4/3;
  overflow: hidden;
  background: #f1f5f9;
}

.product-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s;
}

.product-card:hover .product-img-wrap img {
  transform: scale(1.05);
}

.product-badge {
  position: absolute;
  top: 12px;
  left: 12px;
  padding: 4px 10px;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--primary-dark);
  background: rgba(255,255,255,0.92);
  border: 1px solid var(--border);
  border-radius: 20px;
}

.product-info {
  padding: 20px 22px 22px;
}

.product-info h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text);
}

.product-info p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.product-note {
  margin-top: 32px;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ===== CTA ===== */
.cta {
  padding: 36px 0;
  background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
  position: relative;
  overflow: hidden;
}

.cta::before {
  content: '';
  position: absolute;
  top: 50%; right: 10%;
  transform: translateY(-50%);
  width: 280px; height: 140px;
  background: radial-gradient(ellipse, rgba(245,158,11,0.12) 0%, transparent 70%);
  pointer-events: none;
}

.cta-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
  position: relative;
}

.cta-text h2 {
  font-size: clamp(1.15rem, 2.5vw, 1.4rem);
  color: white;
  margin-bottom: 6px;
}

.cta-text p {
  color: rgba(255,255,255,0.55);
  font-size: 0.875rem;
  line-height: 1.6;
  max-width: 480px;
}

.cta-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-shrink: 0;
}

.cta-email {
  font-size: 0.8rem;
  color: rgba(255,255,255,0.4);
}

.cta .btn-primary {
  padding: 10px 24px;
  font-size: 0.875rem;
}

/* ===== PAGE HEADER ===== */
.page-header {
  padding: 140px 0 60px;
  background: var(--bg-white);
  text-align: center;
  border-bottom: 1px solid var(--border);
}

.page-title {
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 800;
  margin-bottom: 12px;
}

.page-title .highlight {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.page-desc { color: var(--text-secondary); }

/* ===== CONTACT ===== */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.contact-item {
  background: white;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: box-shadow 0.3s;
}

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

.contact-label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 8px;
}

.contact-value { font-size: 1.05rem; font-weight: 500; }

.info-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.info-card {
  background: white;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
}

/* ===== FOOTER ===== */
.footer {
  background: var(--bg-dark);
  color: rgba(255,255,255,0.6);
  padding: 48px 0 24px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 36px;
  margin-bottom: 32px;
}

.footer-brand p {
  font-size: 0.875rem;
  line-height: 1.85;
  margin-top: 16px;
  max-width: 280px;
}

.footer-brand .logo { color: white; }

.footer-col h4 {
  font-size: 0.8rem;
  font-weight: 600;
  color: white;
  margin-bottom: 20px;
  letter-spacing: 0.05em;
}

.footer-links { list-style: none; }
.footer-links li { margin-bottom: 12px; }
.footer-links a {
  font-size: 0.875rem;
  color: rgba(255,255,255,0.5);
  transition: color 0.2s;
  cursor: pointer;
}
.footer-links a:hover { color: white; }

.footer-bottom {
  padding-top: 32px;
  border-top: 1px solid rgba(255,255,255,0.08);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  font-size: 0.8rem;
  color: rgba(255,255,255,0.35);
}

.footer-bottom a { color: rgba(255,255,255,0.35); }
.footer-bottom a:hover { color: rgba(255,255,255,0.6); }

/* ===== REVEAL ===== */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ===== 404 ===== */
.error-page {
  min-height: 60vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 120px 24px;
}

.error-code {
  font-size: 6rem;
  font-weight: 900;
  color: var(--primary);
  line-height: 1;
  margin-bottom: 16px;
}

/* ===== TIMELINE ===== */
.timeline { position: relative; padding-left: 28px; max-width: 600px; }

.timeline::before {
  content: '';
  position: absolute;
  left: 0; top: 6px; bottom: 6px;
  width: 2px;
  background: linear-gradient(to bottom, var(--primary), var(--accent));
}

.timeline-item { position: relative; padding-bottom: 36px; }
.timeline-item:last-child { padding-bottom: 0; }

.timeline-item::before {
  content: '';
  position: absolute;
  left: -32px; top: 6px;
  width: 10px; height: 10px;
  background: white;
  border: 2px solid var(--primary);
  border-radius: 50%;
}

.timeline-year {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: 0.08em;
  margin-bottom: 6px;
}

.timeline-text {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.85;
}

/* ===== STEPS ===== */
.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  counter-reset: step;
}

.step-card {
  background: white;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  text-align: center;
  position: relative;
  transition: box-shadow 0.3s, transform 0.3s;
}

.step-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.step-num {
  width: 40px; height: 40px;
  background: var(--gradient);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
  margin: 0 auto 16px;
}

.step-card h3 {
  font-size: 1rem;
  margin-bottom: 10px;
}

.step-card p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.75;
}

/* ===== CATEGORY GRID ===== */
.category-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.category-card {
  background: white;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: all 0.3s;
}

.category-card:hover {
  border-color: rgba(37,99,235,0.2);
  box-shadow: var(--shadow);
  transform: translateY(-3px);
}

.category-icon {
  width: 44px; height: 44px;
  background: var(--primary-bg);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 16px;
}

.category-card h3 {
  font-size: 1.05rem;
  margin-bottom: 8px;
}

.category-card p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ===== CHECK LIST ===== */
.check-list { list-style: none; }

.check-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px 0;
  border-bottom: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
}

.check-list li:last-child { border-bottom: none; }

.check-list li::before {
  content: '✓';
  flex-shrink: 0;
  width: 22px; height: 22px;
  background: var(--primary-bg);
  color: var(--primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  font-weight: 700;
  margin-top: 2px;
}

/* ===== PROMISE BOX ===== */
.promise-box {
  background: white;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 48px;
  box-shadow: var(--shadow);
}

.promise-box h3 {
  font-size: 1.25rem;
  margin-bottom: 20px;
}

.promise-box p {
  color: var(--text-secondary);
  line-height: 1.95;
  margin-bottom: 16px;
}

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

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .hero-grid, .about-grid { grid-template-columns: 1fr; }
  .hero-cards { height: 300px; margin-top: 40px; }
  .services-grid { grid-template-columns: 1fr; }
  .values-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .info-grid { grid-template-columns: 1fr; }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .category-grid { grid-template-columns: repeat(2, 1fr); }
  .product-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .nav-toggle { display: block; }
  .nav {
    position: fixed;
    top: 64px; left: 0; right: 0;
    background: white;
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: 20px 24px;
    gap: 16px;
    display: none;
    box-shadow: var(--shadow);
  }
  .nav.open { display: flex; }
  .nav-cta { text-align: center; }
  .hero { padding: 120px 0 60px; }
  .hero-cards { display: none; }
  .stats-grid, .contact-grid { grid-template-columns: 1fr; }
  .stats-grid.stats-4 { grid-template-columns: repeat(2, 1fr); }
  .section { padding: 72px 0; }
  .footer-grid { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; }
  .category-grid { grid-template-columns: 1fr; }
  .product-grid { grid-template-columns: 1fr; }
  .cta-inner { flex-direction: column; text-align: center; }
  .cta-actions { flex-direction: column; width: 100%; }
  .promise-box { padding: 32px 24px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition-duration: 0.01ms !important; }
  .reveal { opacity: 1; transform: none; }
}