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

:root {
  --green: #25d366;
  --dark: #111b21;
  --text: #3b4a54;
  --light: #f0f2f5;
  --border: #e9edef;
  --max-w: 820px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  line-height: 1.75;
  font-size: 16px;
}

a { color: var(--green); text-decoration: none; }
a:hover { text-decoration: underline; }

nav {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.logo { font-size: 1.2rem; font-weight: 700; color: var(--dark); }
.logo span { color: var(--green); }
nav time { font-size: 0.78rem; color: #8696a0; }

.hero {
  text-align: center;
  padding: 3.5rem 1.5rem 2rem;
  max-width: var(--max-w);
  margin: 0 auto;
}
.hero h1 { font-size: 2rem; color: var(--dark); margin-bottom: 0.5rem; }
.hero > p { font-size: 1rem; margin-bottom: 1.25rem; }
.btn {
  display: inline-block;
  background: var(--green);
  color: #fff;
  padding: 0.65rem 1.8rem;
  border-radius: 6px;
  font-weight: 600;
  transition: opacity 0.2s;
}
.btn:hover { opacity: 0.85; text-decoration: none; }

.video-wrap {
  margin-top: 1.5rem;
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--border);
}
.video-wrap video { display: block; width: 100%; }

section {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

#cards { padding-top: 0; }

h2 { font-size: 1.15rem; color: var(--dark); margin-bottom: 0.5rem; }

.grid { display: flex; flex-direction: column; gap: 1rem; }

.card {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.25rem 1.5rem;
}
.card h2 { margin-bottom: 0.4rem; }
.card p { font-size: 0.93rem; }

code {
  background: var(--light);
  padding: 0.1rem 0.35rem;
  border-radius: 3px;
  font-size: 0.87rem;
}

.faq-list { display: flex; flex-direction: column; gap: 0.5rem; }
details {
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}
summary {
  padding: 0.8rem 1.1rem;
  cursor: pointer;
  font-weight: 600;
  color: var(--dark);
  font-size: 0.93rem;
  list-style: none;
}
summary::-webkit-details-marker { display: none; }
summary::before { content: "+"; margin-right: 0.5rem; color: var(--green); font-weight: 400; }
details[open] summary::before { content: "−"; }
details p { padding: 0 1.1rem 0.8rem; font-size: 0.93rem; }

#about { border-top: 1px solid var(--border); margin-top: 1rem; }
#about p { font-size: 0.85rem; color: #8696a0; }

@media (max-width: 600px) {
  .hero h1 { font-size: 1.5rem; }
  .hero { padding: 2.5rem 1.25rem 1.5rem; }
  section { padding: 1.5rem 1.25rem; }
  .card { padding: 1rem 1.15rem; }
}