:root {
  --bg: #0d1117;
  --bg-surface: #161b22;
  --bg-elevated: #1c2128;
  --border: #30363d;
  --text: #e6edf3;
  --text-muted: #8b949e;
  --accent: #58a6ff;
  --accent-hover: #79b8ff;
  --accent-dim: #1f6feb;
  --radius: 8px;
  --max-width: 760px;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 24px;
  max-width: var(--max-width);
  margin: 0 auto;
}

.nav-brand {
  font-weight: 700;
  font-size: 18px;
}

.nav-brand .accent { color: var(--accent); }

.nav-tag {
  font-size: 13px;
  color: var(--text-muted);
  border: 1px solid var(--border);
  padding: 4px 10px;
  border-radius: 20px;
}

.hero {
  padding: 80px 0 64px;
  text-align: center;
}

.hero h1 {
  font-size: clamp(28px, 5vw, 42px);
  line-height: 1.15;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

.subheadline {
  font-size: 19px;
  color: var(--text-muted);
  max-width: 580px;
  margin: 0 auto 36px;
}

.cta {
  display: inline-block;
  background: var(--accent-dim);
  color: var(--text);
  font-size: 17px;
  font-weight: 600;
  padding: 14px 28px;
  border-radius: var(--radius);
  text-decoration: none;
  transition: background 0.15s ease, transform 0.1s ease;
  border: none;
  cursor: pointer;
}

.cta:hover {
  background: var(--accent);
  color: #fff;
  text-decoration: none;
}

.cta:active { transform: scale(0.98); }

.cta-large {
  font-size: 19px;
  padding: 16px 36px;
}

.microcopy {
  margin-top: 12px;
  font-size: 14px;
  color: var(--text-muted);
}

.problem {
  padding: 48px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: var(--bg-surface);
}

.problem-list {
  list-style: none;
}

.problem-list li {
  padding: 12px 0 12px 28px;
  position: relative;
  color: var(--text-muted);
}

.problem-list li::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--accent);
}

.problem-list li em {
  color: var(--text);
  font-style: normal;
  font-weight: 600;
}

.ideas { padding: 64px 0; }

.section-heading {
  font-size: 24px;
  margin-bottom: 8px;
  letter-spacing: -0.01em;
}

.section-intro {
  color: var(--text-muted);
  margin-bottom: 40px;
}

.idea {
  padding: 28px;
  margin-bottom: 20px;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color 0.15s ease;
}

.idea:hover { border-color: var(--accent-dim); }

.idea h3 {
  font-size: 19px;
  margin-bottom: 12px;
}

.idea p {
  margin-bottom: 10px;
  color: var(--text-muted);
}

.idea .idea-value {
  color: var(--text);
  font-style: italic;
  padding-left: 16px;
  border-left: 3px solid var(--accent-dim);
  margin-top: 14px;
}

.idea code {
  background: var(--bg-elevated);
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 15px;
  color: var(--accent);
}

.trust {
  padding: 40px 0;
  background: var(--bg-surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.trust ul { list-style: none; }

.trust li {
  padding: 8px 0;
  color: var(--text-muted);
  text-align: center;
  font-size: 15px;
}

.faq { padding: 64px 0; }

details {
  border-bottom: 1px solid var(--border);
  padding: 16px 0;
}

details summary {
  cursor: pointer;
  font-weight: 600;
  font-size: 17px;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

details summary::after {
  content: "+";
  color: var(--text-muted);
  font-size: 20px;
}

details[open] summary::after { content: "−"; }

details p {
  margin-top: 12px;
  color: var(--text-muted);
}

.footer-cta {
  padding: 64px 0;
  text-align: center;
  border-top: 1px solid var(--border);
}

.copyright {
  padding: 24px 0;
  text-align: center;
  font-size: 13px;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
}

.survey { padding: 64px 0; }

.survey h2 {
  font-size: 24px;
  margin-bottom: 32px;
  letter-spacing: -0.01em;
}

.survey fieldset {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
  margin-bottom: 20px;
  background: var(--bg-surface);
}

.survey legend {
  font-weight: 600;
  font-size: 16px;
  padding: 0 8px;
  color: var(--text);
}

.survey legend small { font-weight: 400; color: var(--text-muted); }

.survey label {
  display: block;
  padding: 6px 0;
  color: var(--text-muted);
  cursor: pointer;
}

.survey input[type="checkbox"],
.survey input[type="radio"] {
  margin-right: 8px;
  accent-color: var(--accent);
}

.survey textarea {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  color: var(--text);
  font-family: inherit;
  font-size: 15px;
  resize: vertical;
}

.survey .cta { margin-top: 24px; }

@media (max-width: 600px) {
  .hero { padding: 48px 0 40px; }
  .ideas, .faq { padding: 40px 0; }
  .idea { padding: 20px; }
  .nav-tag { display: none; }
}