:root {
  --bg: #0f1115;
  --bg-alt: #161922;
  --card: #1b1f2a;
  --text: #e8eaf0;
  --text-dim: #9aa1b2;
  --accent: #5b8def;
  --accent-2: #7ee787;
  --radius: 12px;
}

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

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

.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 40px;
}

.logo { font-weight: 700; font-size: 1.2rem; color: var(--accent); }

.nav-links { list-style: none; display: flex; gap: 28px; }
.nav-links a { color: var(--text-dim); text-decoration: none; font-size: 0.95rem; }
.nav-links a:hover { color: var(--text); }

.hero {
  background: radial-gradient(circle at 20% -10%, rgba(91,141,239,0.25), transparent 50%),
              radial-gradient(circle at 80% 0%, rgba(126,231,135,0.15), transparent 50%);
}

.hero-content {
  max-width: 720px;
  margin: 0 auto;
  padding: 80px 24px 100px;
  text-align: center;
}

.hero-content h1 {
  font-size: 2.6rem;
  margin-bottom: 16px;
}

.hero-content p {
  color: var(--text-dim);
  margin-bottom: 32px;
  font-size: 1.05rem;
}

.cta {
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 12px 28px;
  border-radius: 999px;
  font-size: 1rem;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.cta:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(91,141,239,0.35); }

.result {
  margin-top: 24px;
  background: var(--card);
  border-radius: var(--radius);
  padding: 16px;
  text-align: left;
  font-size: 0.85rem;
  color: var(--accent-2);
  min-height: 24px;
  white-space: pre-wrap;
  word-break: break-all;
}

.section {
  max-width: 960px;
  margin: 0 auto;
  padding: 64px 24px;
}

.section.alt { background: var(--bg-alt); max-width: 100%; }
.section.alt > * { max-width: 960px; margin: 0 auto; }
.section.alt p { margin-bottom: 8px; }

.section h2 {
  font-size: 1.6rem;
  margin-bottom: 24px;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
}

.card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 24px;
}

.card h3 { color: var(--accent); margin-bottom: 8px; font-size: 1.05rem; }
.card p { color: var(--text-dim); font-size: 0.92rem; }

code {
  background: rgba(255,255,255,0.08);
  padding: 2px 8px;
  border-radius: 6px;
  font-size: 0.9em;
}

footer {
  text-align: center;
  padding: 32px 24px 48px;
  color: var(--text-dim);
  font-size: 0.85rem;
}

@media (max-width: 600px) {
  .nav-links { display: none; }
  .hero-content h1 { font-size: 2rem; }
}