:root {
  --bg: #0b1f3a;
  --bg-card: #132a4a;
  --text: #f1f5f9;
  --muted: #94a3b8;
  --blue: #3b82f6;
  --blue-dark: #2563eb;
  --green: #22c55e;
  --radius: 12px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

a {
  color: #93c5fd;
}

.wrap {
  max-width: 1040px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

.header {
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  position: sticky;
  top: 0;
  background: rgba(11, 31, 58, 0.92);
  backdrop-filter: blur(8px);
  z-index: 10;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 3.5rem;
}

.logo {
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--text);
  text-decoration: none;
}

.nav {
  display: flex;
  gap: 1.25rem;
  align-items: center;
  font-size: 0.9rem;
}

.nav a {
  color: var(--muted);
  text-decoration: none;
}

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

.nav-cta {
  color: var(--text) !important;
  background: var(--blue);
  padding: 0.35rem 0.85rem;
  border-radius: 8px;
}

.nav-cta:hover {
  background: var(--blue-dark);
}

.hero {
  padding: 4rem 0 3rem;
}

.hero-grid {
  display: grid;
  gap: 2.5rem;
  align-items: center;
}

@media (min-width: 768px) {
  .hero-grid {
    grid-template-columns: 1fr 280px;
  }
}

.eyebrow {
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 0.75rem;
}

h1 {
  font-size: clamp(2rem, 5vw, 2.75rem);
  line-height: 1.15;
  margin: 0;
}

h1 span {
  color: #60a5fa;
}

.lead {
  margin: 1.25rem 0 0;
  color: var(--muted);
  max-width: 32rem;
  font-size: 1.05rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border-radius: 999px;
  font-weight: 600;
  text-decoration: none;
  font-size: 1rem;
  border: none;
  cursor: pointer;
}

.btn-primary {
  background: linear-gradient(135deg, var(--blue), var(--blue-dark));
  color: #fff;
  box-shadow: 0 8px 24px rgba(59, 130, 246, 0.35);
}

.btn-primary:hover {
  filter: brightness(1.08);
}

.btn-disabled {
  opacity: 0.65;
  cursor: not-allowed;
}

.btn-ghost {
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: var(--text);
}

.hint {
  margin-top: 1rem;
  font-size: 0.85rem;
  color: var(--muted);
}

.hero-card {
  background: var(--bg-card);
  border-radius: 1.5rem;
  padding: 2.5rem 1.5rem;
  text-align: center;
  border: 1px solid rgba(255, 255, 255, 0.06);
}

.mock-status {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #64748b;
}

.dot.connected {
  background: var(--green);
  box-shadow: 0 0 12px rgba(34, 197, 94, 0.6);
}

.mock-btn {
  margin-top: 2rem;
  width: 140px;
  height: 140px;
  border-radius: 50%;
  border: none;
  background: linear-gradient(135deg, var(--blue), var(--blue-dark));
  color: #fff;
  font-size: 1.25rem;
  font-weight: 600;
}

.steps,
.faq {
  padding: 3rem 0;
}

.steps h2,
.faq h2 {
  margin: 0 0 1.5rem;
  font-size: 1.5rem;
}

.step-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 1rem;
}

@media (min-width: 640px) {
  .step-list {
    grid-template-columns: repeat(3, 1fr);
  }
}

.step-list li {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 1.25rem;
  border: 1px solid rgba(255, 255, 255, 0.06);
}

.step-list strong {
  display: block;
  margin-bottom: 0.35rem;
}

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

.faq details {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 0.75rem 1rem;
  margin-bottom: 0.5rem;
  border: 1px solid rgba(255, 255, 255, 0.06);
}

.faq summary {
  cursor: pointer;
  font-weight: 600;
}

.faq p {
  margin: 0.5rem 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.footer {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 2rem 0;
  margin-top: 2rem;
}

.footer-inner {
  text-align: center;
  font-size: 0.85rem;
  color: var(--muted);
}

.footer-inner p {
  margin: 0.35rem 0;
}