/*
Theme Name: OpenClaw User Group (Apple Style)
Description: A premium, minimalist, responsive one-page theme inspired by Apple design.
Author: Shin Sung-kyung
Version: 2.0
*/

:root {
  --bg-color: #000000;
  --text-main: #f5f5f7;
  --text-sub: #86868b;
  --accent: #2997ff;
  --card-bg: #1d1d1f;
  --font-family: "SF Pro Display", "SF Pro Icons", "Helvetica Neue", Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  padding: 0;
  background-color: var(--bg-color);
  color: var(--text-main);
  font-family: var(--font-family);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* Header / Hero Section */
header {
  height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 0 20px;
  background: radial-gradient(circle at center, #1a1a1a 0%, #000 100%);
}

h1 {
  font-size: 5rem;
  font-weight: 700;
  margin: 0;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, #fff 0%, #a1a1a6 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  opacity: 0;
  animation: fadeUp 1s ease-out forwards 0.3s;
}

.hero-subtitle {
  font-size: 1.8rem;
  color: var(--text-sub);
  margin-top: 20px;
  font-weight: 400;
  opacity: 0;
  animation: fadeUp 1s ease-out forwards 0.6s;
}

.cta-button {
  margin-top: 40px;
  padding: 12px 26px;
  font-size: 1.1rem;
  background-color: var(--accent);
  color: #fff;
  border-radius: 980px;
  text-decoration: none;
  font-weight: 500;
  transition: transform 0.2s, background-color 0.2s;
  opacity: 0;
  animation: fadeUp 1s ease-out forwards 0.9s;
}

.cta-button:hover {
  background-color: #0071e3;
  transform: scale(1.02);
}

/* Main Content */
main {
  max-width: 1200px;
  margin: 0 auto;
}

.section {
  padding: 150px 20px;
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 1s ease-out, transform 1s ease-out;
}

.section.visible {
  opacity: 1;
  transform: translateY(0);
}

.section-title {
  font-size: 3.5rem;
  font-weight: 600;
  margin-bottom: 60px;
  text-align: center;
}

.section-desc {
  font-size: 1.5rem;
  color: var(--text-sub);
  text-align: center;
  max-width: 800px;
  margin: 0 auto 80px;
  line-height: 1.4;
}

/* Grid Layout */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 30px;
}

.card {
  background-color: var(--card-bg);
  padding: 40px;
  border-radius: 20px;
  transition: transform 0.3s ease;
  text-align: center;
}

.card:hover {
  transform: scale(1.02);
}

.card h3 {
  font-size: 2rem;
  margin-bottom: 15px;
  color: #fff;
}

.card p {
  font-size: 1.1rem;
  color: var(--text-sub);
  line-height: 1.5;
}

.icon {
  font-size: 3rem;
  margin-bottom: 20px;
  display: block;
}

/* Footer */
footer {
  padding: 60px 20px;
  background-color: #111;
  text-align: center;
  color: var(--text-sub);
  font-size: 0.9rem;
  border-top: 1px solid #333;
}

/* Keyframes */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Responsive */
@media (max-width: 768px) {
  h1 { font-size: 3rem; }
  .hero-subtitle { font-size: 1.3rem; }
  .section-title { font-size: 2.5rem; }
  .section { padding: 80px 20px; }
}