/* Reset & Base */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --bg: #0a0a0b;
  --bg-elevated: #141416;
  --bg-card: #1a1a1e;
  --border: #2a2a2e;
  --text: #f4f4f5;
  --text-muted: #a1a1aa;
  --accent: #22c55e;
  --accent-hover: #16a34a;
  --accent-dim: rgba(34, 197, 94, 0.15);
  --highlight: #4ade80;
  --radius: 12px;
  --radius-sm: 8px;
  --font: 'Inter', system-ui, -apple-system, sans-serif;
}
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.container { max-width: 1100px; margin: 0 auto; padding: 0 20px; }

/* Sponsor Bar */
.sponsor-bar {
  background: linear-gradient(90deg, #14532d, #166534);
  padding: 10px 0;
  font-size: 14px;
  text-align: center;
}
.sponsor-inner { display: flex; align-items: center; justify-content: center; gap: 10px; flex-wrap: wrap; }
.sponsor-label { color: #86efac; font-weight: 500; }
.sponsor-link { color: #fff; font-weight: 600; text-decoration: underline; }
.sponsor-link:hover { color: #bbf7d0; }

/* Header */
.header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(10, 10, 11, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
}
.logo {
  display: flex; align-items: center; gap: 8px;
  font-weight: 800; font-size: 1.25rem;
}
.logo-icon {
  background: var(--accent);
  color: #000;
  width: 28px; height: 28px;
  border-radius: 6px;
  display: flex; align-items: center; justify-content: center;
  font-weight: 800;
}
.nav { display: flex; align-items: center; gap: 28px; }
.nav a { color: var(--text-muted); font-weight: 500; font-size: 0.95rem; transition: color 0.15s; }
.nav a:hover { color: var(--text); }
.btn-sponsor {
  background: var(--accent) !important;
  color: #000 !important;
  padding: 8px 16px;
  border-radius: 999px;
  font-weight: 600 !important;
}
.btn-sponsor:hover { background: var(--accent-hover) !important; }
.mobile-menu-btn { display: none; background: none; border: none; color: var(--text); font-size: 1.5rem; cursor: pointer; }

/* Hero */
.hero {
  padding: 80px 0 60px;
  background: radial-gradient(ellipse 80% 50% at 50% -20%, rgba(34, 197, 94, 0.12), transparent);
}
.hero-content { text-align: center; max-width: 720px; margin: 0 auto; }
.hero h1 {
  font-size: clamp(2.1rem, 5vw, 3.2rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 18px;
}
.highlight { color: var(--highlight); }
.hero-sub {
  font-size: 1.15rem;
  color: var(--text-muted);
  margin-bottom: 36px;
  max-width: 540px;
  margin-left: auto;
  margin-right: auto;
}
.search-box {
  display: flex; gap: 10px;
  max-width: 480px;
  margin: 0 auto 40px;
}
.search-box input {
  flex: 1;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px 18px;
  color: var(--text);
  font-size: 1rem;
  outline: none;
  transition: border-color 0.15s;
}
.search-box input:focus { border-color: var(--accent); }
.search-box input::placeholder { color: #71717a; }
.search-box button {
  background: var(--accent);
  color: #000;
  border: none;
  border-radius: var(--radius-sm);
  padding: 0 24px;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: background 0.15s;
}
.search-box button:hover { background: var(--accent-hover); }
.hero-stats {
  display: flex; justify-content: center; gap: 48px; flex-wrap: wrap;
}
.stat { text-align: center; }
.stat-num { display: block; font-size: 1.5rem; font-weight: 700; color: var(--highlight); }
.stat-label { font-size: 0.85rem; color: var(--text-muted); }

/* Newsletter CTA */
.newsletter-cta { padding: 20px 0 60px; }
.newsletter-box {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}
.newsletter-text h2 { font-size: 1.25rem; font-weight: 700; margin-bottom: 4px; }
.newsletter-text p { color: var(--text-muted); font-size: 0.95rem; }
.newsletter-form { display: flex; gap: 10px; flex: 1; max-width: 400px; }
.newsletter-form input {
  flex: 1;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  color: var(--text);
  font-size: 0.95rem;
  outline: none;
}
.newsletter-form input:focus { border-color: var(--accent); }
.newsletter-form button {
  background: var(--accent);
  color: #000;
  border: none;
  border-radius: var(--radius-sm);
  padding: 0 20px;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
}
.newsletter-form button:hover { background: var(--accent-hover); }

/* Categories */
.categories { padding: 40px 0 60px; }
.section-title {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 28px;
  text-align: center;
}
.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
}
.category-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: border-color 0.15s, transform 0.15s;
}
.category-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}
.cat-icon { font-size: 1.75rem; display: block; margin-bottom: 12px; }
.category-card h3 { font-size: 1.1rem; font-weight: 600; margin-bottom: 6px; }
.category-card p { color: var(--text-muted); font-size: 0.9rem; }

/* Use Cases */
.use-cases { padding: 40px 0 80px; }
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 28px;
}
.section-header .section-title { margin-bottom: 0; text-align: left; }
.filters { display: flex; gap: 8px; flex-wrap: wrap; }
.filter-btn {
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 8px 16px;
  border-radius: 999px;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s;
}
.filter-btn:hover, .filter-btn.active {
  background: var(--accent-dim);
  border-color: var(--accent);
  color: var(--highlight);
}
.use-case-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 20px;
}
.use-case-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  display: flex;
  flex-direction: column;
  transition: border-color 0.15s;
}
.use-case-card:hover { border-color: #3f3f46; }
.use-case-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
  font-size: 0.8rem;
  color: var(--text-muted);
}
.use-case-tag {
  background: var(--accent-dim);
  color: var(--highlight);
  padding: 3px 10px;
  border-radius: 999px;
  font-weight: 500;
}
.use-case-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 10px;
  line-height: 1.35;
}
.use-case-card p {
  color: var(--text-muted);
  font-size: 0.925rem;
  margin-bottom: 16px;
  flex: 1;
}
.use-case-result {
  background: rgba(34, 197, 94, 0.08);
  border-left: 3px solid var(--accent);
  padding: 10px 14px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 0.9rem;
  margin-bottom: 16px;
  color: #bbf7d0;
}
.use-case-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: auto;
}
.agent-badge {
  font-size: 0.8rem;
  color: var(--text-muted);
  background: var(--bg);
  padding: 4px 10px;
  border-radius: 6px;
}
.view-prompt {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--highlight);
}
.view-prompt:hover { text-decoration: underline; }

/* How it works */
.how-it-works {
  padding: 60px 0 80px;
  background: var(--bg-elevated);
  border-top: 1px solid var(--border);
}
.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 32px;
  margin-top: 40px;
}
.step-num {
  width: 40px; height: 40px;
  background: var(--accent);
  color: #000;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-weight: 800;
  font-size: 1.1rem;
  margin-bottom: 16px;
}
.step h3 { font-size: 1.15rem; font-weight: 600; margin-bottom: 8px; }
.step p { color: var(--text-muted); font-size: 0.95rem; }

/* Footer */
.footer {
  padding: 60px 0 30px;
  border-top: 1px solid var(--border);
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-brand p { color: var(--text-muted); margin-top: 12px; font-size: 0.95rem; max-width: 280px; }
.footer-links h4 { font-size: 0.9rem; font-weight: 600; margin-bottom: 16px; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.05em; }
.footer-links a { display: block; color: var(--text-muted); margin-bottom: 10px; font-size: 0.95rem; }
.footer-links a:hover { color: var(--text); }
.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 24px;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.875rem;
}

/* Responsive */
@media (max-width: 768px) {
  .nav { display: none; }
  .mobile-menu-btn { display: block; }
  .hero { padding: 50px 0 40px; }
  .newsletter-box { flex-direction: column; align-items: stretch; }
  .newsletter-form { max-width: none; }
  .section-header { flex-direction: column; align-items: flex-start; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .hero-stats { gap: 28px; }
}