:root {
  --bg: #07111f;
  --bg-soft: #0c172a;
  --surface: rgba(255, 255, 255, 0.82);
  --surface-strong: #ffffff;
  --surface-dark: rgba(10, 18, 34, 0.72);
  --line: rgba(148, 163, 184, 0.22);
  --text: #0f172a;
  --text-light: #dbe7ff;
  --muted: #64748b;
  --primary: #246bff;
  --primary-strong: #144cd1;
  --accent: #50c9ff;
  --accent-soft: rgba(80, 201, 255, 0.14);
  --success: #10b981;
  --shadow-xl: 0 32px 80px rgba(2, 8, 23, 0.18);
  --shadow-lg: 0 20px 50px rgba(2, 8, 23, 0.12);
  --radius-xl: 28px;
  --radius-lg: 22px;
  --radius-md: 16px;
  --container: 1180px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text);
  line-height: 1.65;
  background:
    radial-gradient(circle at top left, rgba(36, 107, 255, 0.11), transparent 26%),
    linear-gradient(180deg, #edf4ff 0%, #f7f9fc 38%, #eef3fb 100%);
}

body.menu-open {
  overflow: hidden;
}

.cn,
.en {
  display: inline;
}

body.lang-zh .en {
  display: none;
}

body.lang-en .cn {
  display: none;
}

img,
svg {
  display: block;
}

button,
input,
textarea,
select {
  font: inherit;
}

button {
  cursor: pointer;
}

.container {
  width: min(var(--container), calc(100% - 32px));
  margin: 0 auto;
}

.site-shell {
  min-height: 100vh;
}

.navbar {
  position: sticky;
  top: 0;
  z-index: 200;
  background: rgba(245, 248, 255, 0.82);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(148, 163, 184, 0.18);
}

.navbar.scrolled {
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.06);
}

.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 78px;
  gap: 24px;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  text-decoration: none;
  color: inherit;
  min-width: 0;
}

.logo-mark {
  width: 42px;
  height: 42px;
  border-radius: 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  color: #fff;
  background: linear-gradient(135deg, #1f6bff, #46c6ff);
  box-shadow: 0 14px 30px rgba(36, 107, 255, 0.26);
}

.logo-text {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.logo-main {
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.logo-sub {
  font-size: 12px;
  color: var(--muted);
}

.nav-panel {
  display: flex;
  align-items: center;
  gap: 24px;
  margin-left: auto;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 18px;
}

.nav-links a,
.footer-links a {
  text-decoration: none;
  color: #334155;
  font-size: 14px;
  transition: color 0.2s ease, opacity 0.2s ease;
}

.nav-links a:hover,
.footer-links a:hover {
  color: var(--primary);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

.lang-switch {
  display: inline-flex;
  background: rgba(148, 163, 184, 0.14);
  padding: 4px;
  border-radius: 999px;
}

.lang-switch button {
  border: none;
  background: transparent;
  min-width: 40px;
  height: 34px;
  border-radius: 999px;
  color: #475569;
  font-size: 13px;
}

.lang-switch button.active {
  background: #ffffff;
  color: var(--primary);
  box-shadow: 0 8px 20px rgba(15, 23, 42, 0.08);
}

.menu-toggle {
  display: none;
  border: 1px solid rgba(148, 163, 184, 0.25);
  background: rgba(255, 255, 255, 0.82);
  width: 46px;
  height: 46px;
  border-radius: 14px;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
}

.menu-toggle span {
  width: 18px;
  height: 2px;
  border-radius: 999px;
  background: #0f172a;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.menu-toggle.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.menu-toggle.active span:nth-child(2) {
  opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 48px;
  padding: 0 20px;
  border-radius: 999px;
  text-decoration: none;
  border: 1px solid transparent;
  font-weight: 600;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease,
    border-color 0.2s ease, color 0.2s ease;
}

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

.btn-primary {
  background: linear-gradient(135deg, var(--primary), #2b8cff);
  color: #ffffff;
  box-shadow: 0 16px 30px rgba(36, 107, 255, 0.24);
}

.btn-primary:hover {
  box-shadow: 0 20px 34px rgba(36, 107, 255, 0.28);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.75);
  color: var(--primary);
  border-color: rgba(36, 107, 255, 0.18);
}

.full-width {
  width: 100%;
}

.hero {
  position: relative;
  overflow: hidden;
  padding: 56px 0 32px;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 18% 20%, rgba(36, 107, 255, 0.18), transparent 28%),
    radial-gradient(circle at 88% 18%, rgba(80, 201, 255, 0.16), transparent 24%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.52), rgba(255, 255, 255, 0));
  pointer-events: none;
}

.hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(360px, 0.85fr);
  gap: 36px;
  align-items: stretch;
}

.hero-copy,
.hero-panel,
.panel-card,
.metric-card,
.positioning-card,
.capability-card,
.detail-panel,
.business-card,
.strip-card,
.application-card,
.proof-card,
.timeline-item,
.faq-item,
.contact-form,
.contact-copy {
  backdrop-filter: blur(14px);
}

.hero-copy {
  padding: 34px 0 18px;
}

.eyebrow-group {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 20px;
}

.eyebrow,
.section-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.76);
  border: 1px solid rgba(36, 107, 255, 0.12);
  color: var(--primary);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero h1 {
  font-size: clamp(2.35rem, 5vw, 4.3rem);
  line-height: 1.05;
  letter-spacing: -0.03em;
  max-width: 14ch;
  margin-bottom: 20px;
  color: #081224;
}

.hero-lead {
  font-size: 1.06rem;
  color: #334155;
  max-width: 720px;
}

.hero-lead strong {
  color: #0f172a;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 28px;
}

.hero-note {
  margin-top: 18px;
  color: #64748b;
  font-size: 0.94rem;
}

.hero-panel {
  display: grid;
  gap: 18px;
}

.panel-card {
  border-radius: var(--radius-xl);
  padding: 26px;
  border: 1px solid rgba(255, 255, 255, 0.52);
  box-shadow: var(--shadow-xl);
}

.panel-card-main {
  background:
    linear-gradient(180deg, rgba(6, 19, 38, 0.98), rgba(8, 22, 44, 0.92));
  color: var(--text-light);
}

.panel-label {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: rgba(219, 231, 255, 0.7);
  margin-bottom: 10px;
}

.panel-card-main h2 {
  font-size: 1.6rem;
  line-height: 1.2;
  margin-bottom: 18px;
}

.panel-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.mini-card {
  min-height: 110px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 10px;
  padding: 16px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(148, 163, 184, 0.18);
}

.mini-card strong {
  color: var(--accent);
  font-size: 0.9rem;
}

.panel-card-accent {
  background: rgba(255, 255, 255, 0.78);
}

.panel-card-accent p {
  color: var(--primary);
  font-weight: 700;
  margin-bottom: 12px;
}

.panel-card-accent ul {
  list-style: none;
  display: grid;
  gap: 10px;
}

.panel-card-accent li {
  position: relative;
  padding-left: 18px;
  color: #334155;
}

.panel-card-accent li::before,
.feature-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 8px;
  height: 8px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
}

.metrics-section {
  padding: 10px 0 24px;
}

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.metric-card {
  padding: 22px 20px;
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid rgba(255, 255, 255, 0.8);
  box-shadow: var(--shadow-lg);
}

.metric-card strong {
  font-size: 1.35rem;
  color: #081224;
}

.metric-card p {
  margin-top: 6px;
  color: #475569;
  font-size: 0.96rem;
}

.metric-disclaimer {
  margin-top: 12px;
  color: #64748b;
  font-size: 0.88rem;
}

.section {
  padding: 84px 0;
}

.section-alt {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.72), rgba(255, 255, 255, 0.94));
  border-top: 1px solid rgba(148, 163, 184, 0.1);
  border-bottom: 1px solid rgba(148, 163, 184, 0.1);
}

.section-head {
  display: grid;
  gap: 16px;
  margin-bottom: 30px;
}

.section-head h2 {
  font-size: clamp(1.85rem, 3vw, 2.95rem);
  line-height: 1.14;
  max-width: 17ch;
  letter-spacing: -0.02em;
}

.about-grid,
.dual-panel,
.contact-wrap {
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(360px, 0.88fr);
  gap: 24px;
  align-items: stretch;
}

.about-copy,
.contact-copy {
  background: rgba(255, 255, 255, 0.58);
  border: 1px solid rgba(255, 255, 255, 0.78);
  border-radius: var(--radius-xl);
  padding: 28px;
  box-shadow: var(--shadow-lg);
}

.about-copy p,
.contact-copy p {
  color: #334155;
  font-size: 1rem;
}

.about-copy p + p,
.contact-copy p + p {
  margin-top: 14px;
}

.positioning-card,
.detail-panel,
.contact-form {
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid rgba(255, 255, 255, 0.82);
  border-radius: var(--radius-xl);
  padding: 28px;
  box-shadow: var(--shadow-lg);
}

.stack-item {
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: 14px;
  align-items: start;
}

.stack-item + .stack-item {
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid rgba(148, 163, 184, 0.14);
}

.stack-index {
  width: 40px;
  height: 40px;
  border-radius: 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  color: var(--primary);
  background: rgba(36, 107, 255, 0.08);
}

.stack-item h3,
.detail-panel h3,
.business-card h3,
.application-card h3,
.proof-card h3,
.timeline-body h3,
.contact-copy h2 {
  font-size: 1.14rem;
  margin-bottom: 8px;
}

.stack-item p,
.detail-panel p,
.business-card p,
.application-card p,
.proof-card p,
.timeline-body p,
.faq-answer p {
  color: #475569;
}

.capability-grid,
.business-grid,
.application-grid,
.proof-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.capability-card,
.business-card,
.application-card,
.proof-card,
.strip-card,
.timeline-item,
.faq-item {
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid rgba(255, 255, 255, 0.82);
  border-radius: 24px;
  padding: 24px;
  box-shadow: var(--shadow-lg);
}

.capability-tag,
.business-phase {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 52px;
  height: 34px;
  border-radius: 999px;
  background: rgba(36, 107, 255, 0.08);
  color: var(--primary);
  font-size: 0.88rem;
  font-weight: 700;
  margin-bottom: 14px;
}

.feature-list {
  list-style: none;
  display: grid;
  gap: 14px;
  margin-top: 12px;
}

.feature-list li {
  position: relative;
  padding-left: 18px;
  color: #334155;
}

.collaboration-strip {
  margin-top: 18px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.strip-card h3 {
  font-size: 1rem;
  margin-bottom: 8px;
}

.timeline {
  display: grid;
  gap: 18px;
}

.timeline-item {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 18px;
  align-items: start;
}

.timeline-date {
  font-size: 1.02rem;
  font-weight: 800;
  color: var(--primary);
}

.faq-list {
  display: grid;
  gap: 14px;
}

.faq-item {
  padding: 0;
  overflow: hidden;
}

.faq-question {
  width: 100%;
  border: none;
  background: transparent;
  padding: 22px 24px;
  text-align: left;
  font-weight: 700;
  color: #0f172a;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.faq-question::after {
  content: "+";
  color: var(--primary);
  font-size: 1.35rem;
  flex-shrink: 0;
}

.faq-item.open .faq-question::after {
  content: "−";
}

.faq-answer {
  display: none;
  padding: 0 24px 22px;
}

.faq-item.open .faq-answer {
  display: block;
}

.contact-section {
  padding-bottom: 96px;
}

.contact-points {
  margin-top: 22px;
  display: grid;
  gap: 14px;
}

.contact-points > div {
  padding: 16px 18px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.52);
  border: 1px solid rgba(255, 255, 255, 0.65);
}

.contact-points a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 700;
}

.label {
  display: block;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #64748b;
  margin-bottom: 4px;
}

.contact-form {
  display: grid;
  gap: 16px;
}

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

.form-row label {
  font-size: 0.95rem;
  font-weight: 600;
  color: #334155;
}

.form-row.two-up {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.contact-form input,
.contact-form textarea,
.contact-form select {
  width: 100%;
  min-height: 48px;
  border-radius: 16px;
  border: 1px solid rgba(148, 163, 184, 0.22);
  padding: 0 14px;
  background: rgba(249, 251, 255, 0.92);
  color: #0f172a;
  transition: border-color 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.contact-form textarea {
  padding-top: 12px;
  min-height: 132px;
  resize: vertical;
}

.contact-form input:focus,
.contact-form textarea:focus,
.contact-form select:focus {
  outline: none;
  border-color: rgba(36, 107, 255, 0.42);
  box-shadow: 0 0 0 4px rgba(36, 107, 255, 0.08);
  background: #ffffff;
}

.form-status {
  min-height: 20px;
  color: var(--primary);
  font-size: 0.94rem;
}

.footer {
  background: #07111f;
  color: rgba(219, 231, 255, 0.86);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 28px 0 36px;
}

.footer strong {
  display: block;
  margin-bottom: 4px;
}

.footer p {
  color: rgba(219, 231, 255, 0.68);
}

.footer-links {
  display: flex;
  align-items: center;
  gap: 18px;
}

.footer-links a {
  color: rgba(219, 231, 255, 0.9);
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

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

.delay-1 {
  transition-delay: 0.08s;
}

.delay-2 {
  transition-delay: 0.16s;
}

@media (max-width: 1100px) {
  .nav-links {
    gap: 14px;
  }

  .hero-inner,
  .about-grid,
  .dual-panel,
  .contact-wrap {
    grid-template-columns: minmax(0, 1fr);
  }

  .hero-copy {
    padding-top: 10px;
  }

  .hero h1,
  .section-head h2 {
    max-width: none;
  }

  .metrics-grid,
  .capability-grid,
  .business-grid,
  .application-grid,
  .proof-grid,
  .collaboration-strip {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 920px) {
  .navbar-inner {
    min-height: 72px;
  }

  .menu-toggle {
    display: inline-flex;
    margin-left: auto;
  }

  .nav-panel {
    position: fixed;
    inset: 72px 16px auto 16px;
    background: rgba(255, 255, 255, 0.98);
    border: 1px solid rgba(148, 163, 184, 0.18);
    border-radius: 26px;
    padding: 18px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 16px;
    box-shadow: 0 28px 80px rgba(15, 23, 42, 0.18);
  }

  .nav-panel.open {
    display: flex;
  }

  .nav-links,
  .nav-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .nav-links a {
    padding: 8px 0;
  }

  .nav-cta {
    width: 100%;
  }

  .hero {
    padding-top: 36px;
  }

  .hero-inner {
    gap: 22px;
  }

  .hero-panel {
    grid-template-columns: 1fr;
  }

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

  .timeline-item {
    grid-template-columns: 1fr;
    gap: 8px;
  }

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

@media (max-width: 680px) {
  .container {
    width: min(var(--container), calc(100% - 22px));
  }

  .hero h1 {
    font-size: 2.45rem;
  }

  .panel-grid,
  .metrics-grid,
  .capability-grid,
  .business-grid,
  .application-grid,
  .proof-grid,
  .collaboration-strip,
  .form-row.two-up {
    grid-template-columns: 1fr;
  }

  .panel-card,
  .about-copy,
  .positioning-card,
  .detail-panel,
  .business-card,
  .application-card,
  .proof-card,
  .timeline-item,
  .contact-form,
  .contact-copy {
    padding: 22px;
  }

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

  .btn {
    width: 100%;
  }

  .logo-sub {
    display: none;
  }

  .faq-question {
    padding: 18px 20px;
  }

  .faq-answer {
    padding: 0 20px 18px;
  }
}