:root {
  --bg: #fefdff;
  --fg: #0b0b0b;
  --muted: #5b5b5b;
  --accent: #8057D8;
}

* {
  box-sizing: border-box;
}

html, body {
  height: 100%;
}

body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  background: var(--bg);
  color: var(--fg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Header */
.fixed-header {
  background: var(--bg);
  padding: 1rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  font-weight: 700;
  letter-spacing: 0.2px;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.25rem;
}

.brand img {
  width: 80px;
  height: 80px;
}

.header-cta {
  display: inline-block;
  text-decoration: none;
  color: var(--bg);
  background: var(--accent);
  padding: 0.7rem 1rem;
  border-radius: 999px;
  border: 1px solid var(--accent);
  font-size: 0.9rem;
}

.header-cta:hover {
  background: #6B47C4;
}

main {
  max-width: 800px;
  margin: 0 auto;
  padding: 2rem 1.25rem 4rem 1.25rem;
}

.tag {
  margin-top: 0.5rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.hero {
  margin: 6rem 0 4rem 0;
  text-align: center;
}

.hero h1 {
  font-size: 2.86rem;
  line-height: 1.1;
  margin: 0 0 1rem 0;
}

.powered-by {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  border: 1px solid #000;
  border-radius: 999px;
  padding: 0.4rem 0.8rem;
  font-size: 0.85rem;
  color: #000;
  margin-bottom: 1.5rem;
  background: white;
}

.chatgpt-logo {
  width: 16px;
  height: 16px;
}

.screenshot {
  margin: 2rem 0 2.5rem 0;
}

.screenshot img {
  width: 100%;
  max-width: 900px;
  height: auto;
  border-radius: 12px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

.hero .lead {
  color: var(--muted);
  font-size: 1.125rem;
  margin: 0 0 2rem 0;
}

.cta {
  display: inline-block;
  text-decoration: none;
  color: var(--bg);
  background: var(--accent);
  padding: 0.9rem 1.15rem;
  border-radius: 999px;
  border: 1px solid var(--accent);
}

.cta:hover {
  background: #6B47C4;
}

.grid {
  display: grid;
  gap: 1rem;
  margin: 4rem 0 3rem 0;
}

@media (min-width: 700px) {
  .grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.card {
  border: 1px solid #e8e8e8;
  border-radius: 12px;
  padding: 1.25rem 1rem 1.35rem 1rem;
  background: white;
}

.card span {
  display: block;
  color: var(--muted);
  margin-top: 0.35rem;
}

.list {
  margin: 5rem 0;
}

.list h2 {
  font-size: 1.5rem;
  margin: 0 0 1rem 0;
}

.list ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.list li {
  padding: 0.4rem 0;
  color: var(--fg);
}

footer {
  margin-top: 6rem;
  color: var(--muted);
  text-align: center;
}

.trademark {
  font-size: 0.7rem;
  margin-top: 0.5rem;
}

.shot {
  margin: 2rem 0 3.5rem 0;
}

.shot img {
  width: 100%;
  height: auto;
  border-radius: 20px;
  border: 1px solid #e8e8e8;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.06);
}

.tagline-bottom {
  margin: 4rem 0 0 0;
  text-align: center;
}

.tagline-bottom .tag {
  display: inline-block;
  color: var(--muted);
}

/* Mobile optimizations */
@media (max-width: 768px) {
  .header-cta {
    display: none;
  }
  
  .hero {
    margin: 3rem 0 4rem 0;
  }
  
  .hero h1 {
    font-size: 2.2rem;
  }
}