:root {
  --color-bg: #f6f7f9;
  --color-surface: #ffffff;
  --color-text: #151a26;
  --color-muted: #5b6474;
  --color-border: #e5e7ec;
  --color-accent: #0f6bff;
  --color-accent-soft: #e9f1ff;
  --radius: 16px;
  --shadow: 0 10px 30px rgba(20, 28, 44, 0.08);
  --max-width: 1160px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Roboto, Arial, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
}

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

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

img {
  max-width: 100%;
  height: auto;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: 999px;
  padding: 12px 22px;
  font-weight: 600;
  border: none;
  cursor: pointer;
}

.btn-primary {
  background: var(--color-accent);
  color: #fff;
}

.btn-ghost {
  background: rgba(15, 107, 255, 0.08);
  color: var(--color-accent);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(140%) blur(14px);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  padding-bottom: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand img {
  height: 32px;
  width: 32px;
  object-fit: contain;
}

.brand-name {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.4px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.site-nav a {
  font-size: 14px;
  color: var(--color-muted);
  transition: color 0.2s;
}

.site-nav a:hover {
  color: var(--color-accent);
}

.hero {
  padding: 80px 0 96px;
  background: linear-gradient(135deg, #ffffff 0%, #f4f8ff 100%);
}

.eyebrow {
  display: inline-block;
  margin-bottom: 14px;
  padding: 6px 14px;
  border-radius: 999px;
  background: var(--color-accent-soft);
  color: var(--color-accent);
  font-size: 13px;
  font-weight: 600;
}

.hero h1 {
  max-width: 860px;
  font-size: 44px;
  line-height: 1.18;
  font-weight: 700;
  letter-spacing: -0.3px;
}

.hero-desc {
  max-width: 720px;
  margin-top: 20px;
  color: var(--color-muted);
  font-size: 17px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 32px;
}

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
  margin-top: 56px;
}

.metric {
  padding: 18px 0;
  border-top: 1px solid var(--color-border);
}

.metric-value {
  display: block;
  font-size: 28px;
  font-weight: 700;
}

.metric-label {
  display: block;
  margin-top: 4px;
  color: var(--color-muted);
  font-size: 13px;
}

.solutions {
  padding: 96px 0;
  background: var(--color-surface);
}

.section-header {
  max-width: 760px;
}

.section-header.centered {
  text-align: center;
  margin-left: auto;
  margin-right: auto;
}

.section-header h2 {
  font-size: 30px;
  font-weight: 700;
}

.section-header p {
  margin-top: 12px;
  color: var(--color-muted);
  font-size: 16px;
}

.section-header + .solution-grid,
.section-header + .service-list,
.section-header + .case-tags {
  margin-top: 44px;
}

.solution-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

/* ========== PRODUCT SECTION ========== */
.product {
  padding: 96px 0;
  background: var(--color-bg);
}

.product-intro {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  margin-top: 44px;
  padding: 32px;
  border-radius: var(--radius);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
}

.product-intro-text p {
  color: var(--color-muted);
  font-size: 15px;
  line-height: 1.8;
}

.product-intro-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  align-content: start;
}

.pstat {
  padding: 16px;
  border-radius: 12px;
  background: var(--color-bg);
}

.pstat-value {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
}

.pstat-label {
  display: block;
  margin-top: 4px;
  font-size: 12px;
  color: var(--color-muted);
}

.product-features {
  margin-top: 48px;
}

.product-features h3,
.product-editions h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 20px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.feature-card {
  padding: 24px;
  border-radius: var(--radius);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
}

.feature-card h4 {
  font-size: 15px;
  font-weight: 600;
}

.feature-card p {
  margin-top: 10px;
  color: var(--color-muted);
  font-size: 13px;
  line-height: 1.7;
}

.product-editions {
  margin-top: 48px;
}

.edition-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.edition-item {
  padding: 24px;
  border-radius: var(--radius);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
}

.edition-role {
  display: inline-block;
  margin-bottom: 10px;
  padding: 4px 12px;
  border-radius: 999px;
  background: var(--color-accent-soft);
  color: var(--color-accent);
  font-size: 13px;
  font-weight: 600;
}

.edition-item p {
  color: var(--color-muted);
  font-size: 13px;
  line-height: 1.7;
}

.solution-card {
  padding: 26px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
  transition: transform 0.2s, box-shadow 0.2s;
}

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

.solution-card h3 {
  font-size: 16px;
  font-weight: 600;
}

.solution-card p {
  margin-top: 10px;
  color: var(--color-muted);
  font-size: 14px;
}

.services {
  padding: 96px 0;
  background: var(--color-bg);
}

.service-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.service-item {
  padding: 28px;
  border-radius: var(--radius);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
}

.service-item h3 {
  font-size: 16px;
  font-weight: 600;
}

.service-item p {
  margin-top: 10px;
  color: var(--color-muted);
  font-size: 14px;
}

.cases {
  padding: 96px 0;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.case-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.case-tag {
  padding: 10px 18px;
  border-radius: 999px;
  border: 1px solid var(--color-border);
  background: var(--color-bg);
  color: var(--color-text);
  font-size: 14px;
}

.contact {
  padding: 96px 0;
  background: linear-gradient(135deg, #f6f7f9 0%, #edf4ff 100%);
}

.contact-card {
  max-width: 640px;
  margin: 0 auto;
  padding: 36px;
  border-radius: var(--radius);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow);
}

.contact-card h2 {
  font-size: 26px;
  font-weight: 700;
}

.contact-card > p {
  margin-top: 10px;
  color: var(--color-muted);
  font-size: 15px;
}

.contact-form {
  display: grid;
  gap: 18px;
  margin-top: 28px;
}

.contact-form label {
  display: grid;
  gap: 8px;
}

.contact-form label span {
  font-size: 13px;
  color: var(--color-muted);
}

.contact-form input,
.contact-form textarea {
  padding: 14px 16px;
  border-radius: 14px;
  border: 1px solid var(--color-border);
  background: var(--color-bg);
  color: var(--color-text);
  font: inherit;
  outline: none;
}

.contact-form input:focus,
.contact-form textarea:focus {
  border-color: var(--color-accent);
}

.contact-form textarea {
  resize: vertical;
}

.site-footer {
  padding: 28px 0;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-left {
  display: flex;
  align-items: center;
  gap: 14px;
}

.footer-left img {
  height: 26px;
  width: 26px;
  object-fit: contain;
}

.footer-copy {
  color: var(--color-muted);
  font-size: 13px;
}

.footer-right p {
  color: var(--color-muted);
  font-size: 13px;
}

@media (max-width: 820px) {
  .hero h1 {
    font-size: 30px;
  }

  .hero-metrics {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

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

  .product-intro {
    grid-template-columns: 1fr;
  }

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

  .site-nav {
    display: none;
  }
}