:root {
  --primary: #409eff;
  --primary-dark: #337ecc;
  --primary-light: #ecf5ff;
  --text-primary: #1d2129;
  --text-regular: #4e5969;
  --text-secondary: #86909c;
  --border: #e5e6eb;
  --border-light: #f2f3f5;
  --page-bg: #f7f8fa;
  --white: #ffffff;
  --shadow: 0 30px 80px rgba(30, 64, 98, 0.09);
  --shadow-line: inset 0 1px 0 rgba(255, 255, 255, 0.92);
  --font-display: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", serif;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scrollbar-color: rgba(64, 158, 255, 0.38) rgba(245, 249, 253, 0.78);
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text-primary);
  background:
    radial-gradient(circle at 50% 0%, rgba(64, 158, 255, 0.13), transparent 34rem),
    radial-gradient(circle at 8% 36%, rgba(64, 158, 255, 0.08), transparent 28rem),
    linear-gradient(180deg, #fbfdff 0%, #f5f9fd 52%, #ffffff 100%);
  font-family: var(--font-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a {
  color: inherit;
}

.container {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
}

.header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid rgba(202, 219, 236, 0.66);
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(18px);
  box-shadow: 0 14px 34px rgba(30, 64, 98, 0.04);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 72px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.brand-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: 1px solid rgba(64, 158, 255, 0.26);
  border-radius: 999px;
  color: var(--primary-dark);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: -0.02em;
  background: linear-gradient(145deg, #fff 0%, #edf7ff 100%);
  box-shadow: 0 12px 26px rgba(64, 158, 255, 0.12);
}

.brand-text {
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: #182333;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.btn {
  text-decoration: none;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  padding: 0 24px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 800;
  letter-spacing: 0.01em;
  box-shadow: var(--shadow-line);
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease, background 0.18s ease;
}

.btn:hover,
.btn:focus-visible {
  transform: translateY(-1px);
}

.btn-primary {
  color: #fff;
  border-color: rgba(40, 134, 226, 0.44);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.24), transparent 42%),
    linear-gradient(135deg, #2f8ee9, #62b2ff);
  box-shadow:
    var(--shadow-line),
    0 14px 30px rgba(64, 158, 255, 0.24);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  box-shadow:
    var(--shadow-line),
    0 16px 32px rgba(64, 158, 255, 0.28);
}

.btn-ghost {
  color: #253347;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.88), rgba(255, 255, 255, 0.68));
  border-color: rgba(202, 219, 236, 0.9);
}

.btn-ghost:hover,
.btn-ghost:focus-visible {
  color: var(--primary);
  border-color: rgba(64, 158, 255, 0.34);
  box-shadow: 0 10px 24px rgba(64, 158, 255, 0.08);
}

.hero {
  padding: 108px 0 70px;
}

.hero-inner {
  position: relative;
  max-width: 900px;
  text-align: center;
}

html[lang="en-US"] .hero-inner {
  max-width: 1040px;
}

.hero-inner::after {
  display: block;
  width: min(560px, 72%);
  height: 1px;
  margin: 54px auto 0;
  background: linear-gradient(90deg, transparent, rgba(64, 158, 255, 0.26), transparent);
  content: "";
}

.hero h1 {
  max-width: 1000px;
  margin: 0;
  color: #101828;
  font-family: var(--font-display);
  font-size: clamp(38px, 5.2vw, 60px);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -0.03em;
  text-wrap: balance;
}

html[lang="en-US"] .hero h1 {
  max-width: 1040px;
  font-size: clamp(38px, 4.6vw, 56px);
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 34px;
}

.hero-actions span {
  color: var(--text-secondary);
  font-size: 14px;
}

.section {
  padding: 28px 0 84px;
}

.section-soft {
  background: rgba(255, 255, 255, 0.56);
  border-top: 1px solid var(--border-light);
  border-bottom: 1px solid var(--border-light);
}

.section-low {
  padding: 4px 0 96px;
}

.section-head {
  max-width: 780px;
  margin: 0 auto 24px;
  text-align: center;
}

.section-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(26px, 3.2vw, 36px);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.03em;
}

.section-head p,
.detail-card p,
.product-card-head p {
  margin: 12px 0 0;
  color: var(--text-regular);
}

.section-head p {
  max-width: 66ch;
  margin-right: auto;
  margin-left: auto;
}

.product-grid {
  position: relative;
  align-items: stretch;
  isolation: isolate;
  overflow: hidden;
  border: 1px solid rgba(202, 219, 236, 0.82);
  border-radius: 32px;
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.92) 0%, rgba(243, 249, 255, 0.78) 100%);
  box-shadow:
    var(--shadow-line),
    var(--shadow);
}

.product-grid::before {
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.82) 0%, transparent 46%),
    radial-gradient(circle at 84% 18%, rgba(64, 158, 255, 0.08), transparent 16rem);
  content: "";
}

.detail-card {
  position: relative;
  padding: clamp(28px, 3.8vw, 44px);
  border: 0;
  border-radius: 0;
  background: rgba(255, 255, 255, 0.62);
  box-shadow: none;
}

.product-grid .detail-card + .detail-card {
  border-left: 1px solid rgba(202, 219, 236, 0.72);
}

.product-card {
  display: flex;
  flex-direction: column;
}

.product-card-primary {
  background:
    radial-gradient(circle at 12% 8%, rgba(64, 158, 255, 0.14), transparent 18rem),
    linear-gradient(145deg, rgba(255, 255, 255, 0.96) 0%, rgba(244, 249, 255, 0.82) 100%);
}

.product-card-head {
  position: relative;
  margin-bottom: 24px;
}

.product-card-head p {
  max-width: 45ch;
}

.product-card-title {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 18px;
}

.product-domain {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 0 11px;
  border: 1px solid rgba(64, 158, 255, 0.18);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.74);
  color: #6b7c93;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.01em;
  white-space: nowrap;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.84);
}

.product-card-head::after {
  display: block;
  width: 48px;
  height: 2px;
  margin-top: 20px;
  border-radius: 999px;
  background: linear-gradient(90deg, rgba(64, 158, 255, 0.78), rgba(64, 158, 255, 0.1));
  content: "";
}

.product-card-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.03em;
}

.product-visual {
  position: relative;
  min-height: 136px;
  margin: 0 0 20px;
  overflow: hidden;
  border: 1px solid rgba(202, 219, 236, 0.68);
  border-radius: 24px;
  background:
    radial-gradient(circle at 22% 18%, rgba(64, 158, 255, 0.13), transparent 12rem),
    linear-gradient(145deg, rgba(255, 255, 255, 0.9), rgba(242, 248, 255, 0.72));
  box-shadow: var(--shadow-line);
}

.product-visual::before {
  position: absolute;
  inset: 18px;
  background:
    linear-gradient(90deg, transparent 8%, rgba(64, 158, 255, 0.2) 8% 92%, transparent 92%) 50% 50% / 100% 1px no-repeat,
    linear-gradient(180deg, transparent 10%, rgba(64, 158, 255, 0.18) 10% 88%, transparent 88%) 50% 50% / 1px 100% no-repeat;
  content: "";
}

.product-visual::after {
  position: absolute;
  inset: auto 24px 18px;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(64, 158, 255, 0.26), transparent);
  content: "";
}

.visual-node,
.visual-client,
.visual-stack span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 36px;
  border: 1px solid rgba(64, 158, 255, 0.24);
  border-radius: 999px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.96), rgba(239, 247, 255, 0.86));
  color: #216aa9;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.02em;
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.96),
    0 12px 24px rgba(64, 158, 255, 0.08);
}

.visual-node {
  position: absolute;
  z-index: 1;
  min-width: 82px;
  padding: 0 14px;
}

.visual-node-center {
  left: 50%;
  top: 50%;
  min-width: 96px;
  min-height: 44px;
  transform: translate(-50%, -50%);
  color: #fff;
  border-color: rgba(40, 134, 226, 0.34);
  background: linear-gradient(135deg, #2f8ee9, #69b8ff);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.28),
    0 16px 34px rgba(64, 158, 255, 0.22);
}

.product-visual-routing .visual-node-top {
  left: 50%;
  top: 20px;
  transform: translateX(-50%);
}

.product-visual-routing .visual-node-left {
  left: 24px;
  bottom: 26px;
}

.product-visual-routing .visual-node-right {
  right: 24px;
  bottom: 26px;
}

.product-visual-kit::before {
  background:
    linear-gradient(90deg, transparent 12%, rgba(64, 158, 255, 0.2) 12% 88%, transparent 88%) 50% 50% / 100% 1px no-repeat,
    radial-gradient(circle at 50% 50%, rgba(64, 158, 255, 0.14) 0 2px, transparent 3px);
}

.visual-client {
  position: absolute;
  left: 22px;
  top: 38px;
  z-index: 1;
  width: 96px;
  height: 64px;
  border-radius: 18px;
}

.visual-client::before {
  position: absolute;
  top: 10px;
  left: 14px;
  right: 14px;
  height: 5px;
  border-radius: 999px;
  background: rgba(64, 158, 255, 0.18);
  content: "";
}

.visual-stack {
  position: absolute;
  top: 18px;
  right: 22px;
  bottom: 18px;
  z-index: 1;
  display: grid;
  width: 112px;
  gap: 8px;
}

.visual-stack span {
  min-height: 0;
  border-radius: 14px;
}

.feature-list {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  border-top: 1px solid rgba(202, 219, 236, 0.62);
  border-bottom: 1px solid rgba(202, 219, 236, 0.62);
  list-style: none;
}

.feature-list li {
  position: relative;
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr);
  align-items: start;
  gap: 18px;
  padding: 16px 0;
  border-bottom: 1px solid rgba(202, 219, 236, 0.58);
  color: #42526a;
  font-size: 14px;
  line-height: 1.66;
}

.feature-list li:last-child {
  border-bottom: 0;
}

.feature-key {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 30px;
  padding: 0 10px;
  border: 1px solid rgba(64, 158, 255, 0.2);
  border-radius: 999px;
  background: rgba(236, 245, 255, 0.82);
  color: #216aa9;
  font-size: 12px;
  font-weight: 800;
  line-height: 1.2;
  text-align: center;
  white-space: nowrap;
}

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

html[lang="en-US"] .feature-list li {
  grid-template-columns: 150px minmax(0, 1fr);
}

@media (min-width: 769px) {
  .product-card-head {
    min-height: 166px;
  }
}

.card-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: auto;
  padding-top: 28px;
}

.experience-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  justify-content: space-between;
  max-width: 960px;
  margin: 0 auto;
  padding: 30px 34px;
  border: 1px solid rgba(202, 219, 236, 0.76);
  border-radius: 28px;
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.84), rgba(246, 251, 255, 0.74));
  box-shadow:
    var(--shadow-line),
    0 18px 48px rgba(30, 64, 98, 0.06);
  gap: 32px;
}

.section-head-experience {
  max-width: 660px;
  margin: 0;
  text-align: left;
}

.section-head-experience p {
  margin-right: 0;
  margin-left: 0;
}

.experience-actions {
  flex: 0 0 auto;
  margin-top: 0;
  padding-top: 0;
}

.experience-actions .btn {
  width: auto;
  min-width: 156px;
}

.footer {
  padding: 30px 0 38px;
  border-top: 1px solid rgba(202, 219, 236, 0.62);
  background: rgba(255, 255, 255, 0.78);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  color: var(--text-secondary);
  font-size: 14px;
}

.footer-inner nav {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.footer-inner a {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 700;
}

.footer-inner a:hover,
.footer-inner a:focus-visible {
  color: var(--primary);
}

:focus-visible {
  outline: 3px solid rgba(64, 158, 255, 0.22);
  outline-offset: 3px;
}

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

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: rgba(245, 249, 253, 0.78);
}

::-webkit-scrollbar-thumb {
  border: 3px solid rgba(245, 249, 253, 0.78);
  border-radius: 999px;
  background: rgba(64, 158, 255, 0.42);
  background-clip: content-box;
}

@media (max-width: 768px) {
  .container {
    width: min(100% - 28px, 1080px);
  }

  .header-inner {
    min-height: 60px;
    align-items: flex-start;
    flex-direction: column;
    padding: 12px 0;
  }

  .header-actions {
    width: 100%;
    justify-content: space-between;
  }

  .hero {
    padding: 60px 0 44px;
  }

  .hero-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }

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

  .product-grid {
    border-radius: 26px;
  }

  .product-grid .detail-card + .detail-card {
    border-top: 1px solid rgba(202, 219, 236, 0.72);
    border-left: 0;
  }

  .product-visual {
    min-height: 132px;
  }

  .feature-list li {
    grid-template-columns: max-content minmax(0, 1fr);
  }

  .experience-panel {
    align-items: flex-start;
    grid-template-columns: 1fr;
    gap: 18px;
    padding-top: 24px;
  }

  .section-head-experience {
    text-align: left;
  }

  .experience-actions {
    width: 100%;
  }

  .experience-actions .btn {
    width: 100%;
    min-width: 0;
  }

  .footer-inner {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 36px;
  }

  .detail-card {
    padding: 22px;
  }

  .product-grid .detail-card {
    border-radius: 0;
  }

  .product-card-title {
    align-items: flex-start;
    flex-direction: column;
    gap: 10px;
  }

  .product-visual {
    min-height: 118px;
    border-radius: 20px;
  }

  .product-visual-routing .visual-node-left {
    left: 16px;
  }

  .product-visual-routing .visual-node-right {
    right: 16px;
  }

  .visual-node {
    min-width: 70px;
    padding: 0 10px;
  }

  .visual-node-center {
    min-width: 92px;
  }

  .visual-client {
    left: 12px;
    width: 76px;
    font-size: 10px;
  }

  .visual-stack {
    right: 12px;
    width: 86px;
    gap: 6px;
  }

  .visual-stack span {
    font-size: 10px;
  }

  .product-visual-kit .visual-node-center {
    left: 47%;
    min-width: 82px;
    padding: 0 8px;
    font-size: 10px;
  }

  .feature-list li {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .feature-key {
    justify-self: start;
  }
}