:root {
  --bg: #050816;
  --bg-2: #0a1026;
  --card: rgba(12, 18, 40, 0.78);
  --card-2: rgba(16, 26, 58, 0.88);
  --line: rgba(112, 154, 255, 0.18);
  --text: #eaf0ff;
  --muted: #a9b7db;
  --brand: #65d9ff;
  --brand-2: #8f7bff;
  --accent: #6cffc1;
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.35);
  --radius: 22px;
  --radius-sm: 14px;
  --container: 1200px;
  --transition: 0.28s ease;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background:
    radial-gradient(circle at 20% 20%, rgba(101, 217, 255, 0.12), transparent 30%),
    radial-gradient(circle at 80% 10%, rgba(143, 123, 255, 0.14), transparent 25%),
    radial-gradient(circle at 50% 80%, rgba(108, 255, 193, 0.08), transparent 30%),
    linear-gradient(180deg, var(--bg), var(--bg-2));
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
}

img {
  display: block;
  max-width: 100%;
}

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

button,
textarea {
  font: inherit;
}

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

.bg-grid {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(120, 150, 255, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(120, 150, 255, 0.06) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: linear-gradient(to bottom, rgba(0,0,0,0.55), transparent 95%);
  z-index: -3;
}

.bg-glow {
  position: fixed;
  width: 520px;
  height: 520px;
  border-radius: 50%;
  filter: blur(30px);
  opacity: 0.35;
  z-index: -4;
  pointer-events: none;
}

.bg-glow-1 {
  top: -120px;
  left: -120px;
  background: rgba(101, 217, 255, 0.18);
}

.bg-glow-2 {
  right: -160px;
  top: 220px;
  background: rgba(143, 123, 255, 0.16);
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 999;
  backdrop-filter: blur(14px);
  background: rgba(6, 10, 24, 0.55);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.navbar {
  padding: 14px 0;
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 190px;
}

.brand-logo,
.panel-logo {
  width: 44px;
  height: 44px;
  object-fit: cover;
  border-radius: 12px;
  border: 1px solid rgba(255,255,255,0.16);
  box-shadow: 0 8px 28px rgba(101, 217, 255, 0.2);
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.brand-name {
  font-weight: 800;
  letter-spacing: 0.6px;
}

.brand-subtitle {
  font-size: 12px;
  color: var(--muted);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 10px;
  list-style: none;
  padding: 0;
  margin: 0;
}

.nav-links a,
.lang-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 44px;
  padding: 0 16px;
  border-radius: 999px;
  border: 1px solid transparent;
  color: var(--text);
  background: transparent;
  transition: transform var(--transition), border-color var(--transition),
    background var(--transition), box-shadow var(--transition);
}

.nav-links a:hover,
.lang-btn:hover {
  transform: translateY(-1px);
  border-color: var(--line);
  background: rgba(255, 255, 255, 0.04);
}

.nav-cta {
  background: linear-gradient(135deg, rgba(101,217,255,0.18), rgba(143,123,255,0.18)) !important;
  border-color: rgba(101, 217, 255, 0.35) !important;
  box-shadow: 0 10px 28px rgba(101, 217, 255, 0.12);
}

.lang-btn {
  color: var(--accent);
  border-color: rgba(108, 255, 193, 0.25);
}

.nav-toggle {
  display: none;
  width: 46px;
  height: 46px;
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 14px;
  background: rgba(255,255,255,0.04);
  color: var(--text);
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 4px auto;
  border-radius: 2px;
  background: var(--text);
  transition: transform var(--transition), opacity var(--transition);
}

/* Sections */
.section {
  padding: 100px 0;
}

.section-dark {
  background: linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.00));
}

.hero {
  min-height: calc(100vh - 80px);
  display: flex;
  align-items: center;
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 36px;
  align-items: center;
}

.eyebrow,
.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: 999px;
  background: rgba(101, 217, 255, 0.08);
  border: 1px solid rgba(101, 217, 255, 0.18);
  color: var(--brand);
  font-size: 13px;
  letter-spacing: 0.3px;
}

.hero h1,
.section-heading h2,
.cta-copy h2 {
  margin: 18px 0 16px;
  line-height: 1.12;
  letter-spacing: -0.02em;
}

.hero h1 {
  font-size: clamp(2.6rem, 5vw, 4.8rem);
  max-width: 12ch;
}

.section-heading h2,
.cta-copy h2 {
  font-size: clamp(2rem, 3vw, 3.2rem);
  max-width: 50ch;
}

.hero-desc,
.section-heading p,
.cta-copy p,
.faq-answer,
.info-card p,
.feature-card p,
.solution-card p {
  color: var(--muted);
  font-size: 1.02rem;
}

.hero-desc {
  max-width: 60ch;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin: 28px 0 18px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 20px;
  border-radius: 14px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition),
    border-color var(--transition), background var(--transition);
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  color: #06111f;
  font-weight: 700;
  box-shadow: 0 14px 34px rgba(101, 217, 255, 0.18);
}

.btn-secondary {
  background: rgba(255,255,255,0.04);
  border-color: rgba(255,255,255,0.1);
  color: var(--text);
}

.hero-chips,
.prompt-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.chip,
.prompt-chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 38px;
  padding: 0 14px;
  border-radius: 999px;
  border: 1px solid rgba(101, 217, 255, 0.18);
  background: rgba(255,255,255,0.04);
  color: var(--text);
}

.prompt-chip {
  cursor: pointer;
  transition: transform var(--transition), background var(--transition), border-color var(--transition);
}

.prompt-chip:hover {
  transform: translateY(-1px);
  background: rgba(101, 217, 255, 0.08);
  border-color: rgba(101, 217, 255, 0.35);
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-top: 28px;
}

.stat-card,
.panel-card,
.info-card,
.feature-card,
.solution-card,
.demo-card,
.faq-item,
.advantage-band {
  background: var(--card);
  border: 1px solid rgba(136, 169, 255, 0.14);
  box-shadow: var(--shadow);
  backdrop-filter: blur(12px);
}

.stat-card {
  padding: 16px;
  border-radius: 18px;
}

.stat-card strong {
  display: block;
  font-size: 1.2rem;
  color: #ffffff;
}

.stat-card span {
  color: var(--muted);
  font-size: 0.92rem;
}

.hero-panel {
  display: grid;
  gap: 16px;
}

.panel-card {
  border-radius: var(--radius);
  padding: 22px;
}

.panel-card-main {
  background: linear-gradient(180deg, rgba(13, 19, 44, 0.92), rgba(10, 15, 33, 0.82));
  position: relative;
  overflow: hidden;
}

.panel-card-main::after {
  content: "";
  position: absolute;
  inset: auto -20% -40% auto;
  width: 260px;
  height: 260px;
  border-radius: 50%;
  background: rgba(101, 217, 255, 0.12);
  filter: blur(20px);
}

.panel-top {
  display: flex;
  gap: 14px;
  align-items: center;
  position: relative;
  z-index: 1;
}

.panel-title {
  margin: 0;
  font-weight: 800;
  font-size: 1.08rem;
}

.panel-subtitle {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.code-window {
  margin-top: 18px;
  border-radius: 18px;
  overflow: hidden;
  border: 1px solid rgba(101,217,255,0.16);
  background: rgba(2, 7, 18, 0.85);
  position: relative;
  z-index: 1;
}

.code-bar {
  display: flex;
  gap: 8px;
  padding: 12px 14px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.code-bar span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255,255,255,0.24);
}

.code-text {
  margin: 0;
  padding: 18px 16px 20px;
  color: #bce6ff;
  font-size: 0.98rem;
  line-height: 1.8;
  white-space: pre-wrap;
}

.mini-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 16px;
  position: relative;
  z-index: 1;
}

.mini-item {
  padding: 14px 12px;
  border-radius: 16px;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.07);
  text-align: center;
}

.mini-item strong {
  display: block;
  font-size: 1.1rem;
  margin-bottom: 4px;
}

.mini-item span {
  color: var(--muted);
  font-size: 0.9rem;
}

.panel-card-side h3 {
  margin-top: 0;
  margin-bottom: 12px;
}

.check-list {
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
}

.check-list li + li {
  margin-top: 8px;
}

/* Content cards */
.section-heading {
  text-align: center;
  max-width: 820px;
  margin: 0 auto 42px;
}

.card-grid {
  display: grid;
  gap: 18px;
}

.four-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.info-card,
.feature-card,
.solution-card {
  border-radius: var(--radius);
  padding: 24px;
}

.icon-badge,
.feature-top {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, rgba(101,217,255,0.18), rgba(143,123,255,0.18));
  border: 1px solid rgba(101,217,255,0.18);
  color: var(--brand);
  font-weight: 700;
  margin-bottom: 16px;
}

.info-card h3,
.feature-card h3,
.solution-card h3 {
  margin: 0 0 12px;
  font-size: 1.15rem;
}

.advantage-band {
  margin-top: 20px;
  padding: 22px 24px;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.band-label {
  color: var(--brand);
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.advantage-band p {
  margin: 6px 0 0;
  font-size: 1.2rem;
  color: #ffffff;
  font-weight: 700;
}

.faq-list {
  display: grid;
  gap: 14px;
  max-width: 920px;
  margin: 0 auto;
}

.faq-item {
  border-radius: 18px;
  padding: 2px 18px;
}

.faq-item summary {
  list-style: none;
  cursor: pointer;
  padding: 18px 0;
  font-weight: 700;
  position: relative;
  padding-right: 28px;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 0;
  top: 16px;
  color: var(--brand);
  font-size: 1.4rem;
  transition: transform var(--transition);
}

.faq-item[open] summary::after {
  content: "–";
}

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

.solution-card ul {
  margin: 16px 0 0;
  padding-left: 18px;
  color: var(--text);
}

.solution-card li + li {
  margin-top: 8px;
}

.section-cta {
  padding-top: 120px;
}

.cta-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 22px;
  align-items: start;
}

.demo-card {
  border-radius: var(--radius);
  padding: 22px;
}

.demo-top {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

.demo-badge,
.demo-status {
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.demo-badge {
  color: var(--brand);
}

.demo-status {
  color: var(--accent);
}

.prompt-input {
  width: 100%;
  resize: vertical;
  min-height: 150px;
  color: var(--text);
  background: rgba(3, 8, 19, 0.9);
  border: 1px solid rgba(101, 217, 255, 0.16);
  border-radius: 18px;
  padding: 16px;
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.prompt-input:focus {
  border-color: rgba(101, 217, 255, 0.42);
  box-shadow: 0 0 0 4px rgba(101, 217, 255, 0.09);
}

.demo-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 16px 0;
}

.demo-output {
  min-height: 132px;
  border-radius: 18px;
  padding: 16px;
  background: linear-gradient(180deg, rgba(8, 15, 34, 0.92), rgba(4, 10, 22, 0.96));
  border: 1px solid rgba(255,255,255,0.08);
  color: var(--muted);
}

.demo-output strong {
  color: var(--text);
}

.demo-output ul {
  margin: 12px 0 0;
  padding-left: 18px;
}

.demo-output li + li {
  margin-top: 6px;
}

/* Footer */
.site-footer {
  padding: 40px 0 50px;
  border-top: 1px solid rgba(255,255,255,0.06);
  background: rgba(2, 6, 14, 0.35);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.footer-brand {
  margin: 0 0 6px;
  font-size: 1.1rem;
  font-weight: 800;
}

.footer-inner p {
  margin: 0;
  color: var(--muted);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-links a {
  color: var(--muted);
  transition: color var(--transition);
}

.footer-links a:hover {
  color: var(--text);
}

.noscript-notice {
  position: fixed;
  left: 16px;
  right: 16px;
  bottom: 16px;
  padding: 14px 16px;
  border-radius: 14px;
  background: rgba(255, 196, 80, 0.12);
  border: 1px solid rgba(255, 196, 80, 0.24);
  color: #ffe6b0;
  z-index: 9999;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

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

/* Responsive */
@media (max-width: 1080px) {
  .four-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .hero h1 {
    max-width: 100%;
  }
}

@media (max-width: 760px) {
  .nav-toggle {
    display: inline-block;
  }

  .nav-links {
    position: absolute;
    left: 16px;
    right: 16px;
    top: calc(100% + 12px);
    display: grid;
    gap: 8px;
    padding: 14px;
    border-radius: 18px;
    background: rgba(5, 8, 22, 0.96);
    border: 1px solid rgba(255,255,255,0.08);
    box-shadow: var(--shadow);
    transform: translateY(-10px);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition), transform var(--transition);
  }

  .nav-links.open {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }

  .nav-links a,
  .nav-links .lang-btn {
    width: 100%;
    justify-content: flex-start;
  }

  .hero {
    min-height: auto;
    padding-top: 40px;
  }

  .section {
    padding: 78px 0;
  }

  .hero-stats,
  .mini-grid,
  .four-grid,
  .footer-inner {
    grid-template-columns: 1fr;
    display: grid;
  }

  .advantage-band {
    flex-direction: column;
    align-items: flex-start;
  }

  .footer-inner {
    gap: 18px;
  }
}

@media (max-width: 520px) {
  .container {
    width: min(100% - 20px, var(--container));
  }

  .brand-subtitle {
    display: none;
  }

  .hero-actions,
  .demo-actions {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }

  .panel-card,
  .info-card,
  .feature-card,
  .solution-card,
  .demo-card {
    padding: 18px;
  }
}