/* 
  Theme: Polished Minimal ✨
  Concept: Apple-like, Glassmorphism, Sophisticated
*/

:root {
  --bg-color: #fbfbfd;
  --text-main: #1d1d1f;
  --text-sub: #86868b;
  --accent: #0071e3; /* Apple Blue */
  --card-bg: rgba(255, 255, 255, 0.8);
  --border: rgba(0, 0, 0, 0.05);
  --shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", sans-serif;
  background-color: var(--bg-color);
  color: var(--text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.wrapper {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 24px 80px;
}

/* Header */
header {
  padding: 40px 0;
  margin-bottom: 60px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.brand {
  font-weight: 600;
  font-size: 1.2rem;
  text-decoration: none;
  color: var(--text-main);
  letter-spacing: -0.02em;
}

.hero {
  text-align: center;
  margin-bottom: 100px;
}
.hero h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
  background: linear-gradient(135deg, #1d1d1f 0%, #434344 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero p {
  font-size: 1.3rem;
  color: var(--text-sub);
  max-width: 600px;
  margin: 0 auto;
}

/* Sections */
section { margin-bottom: 100px; }

h2 {
  font-size: 1.8rem;
  font-weight: 600;
  margin-bottom: 40px;
  letter-spacing: -0.02em;
}

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

.card {
  background: var(--card-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-radius: 24px;
  padding: 32px;
  box-shadow: var(--shadow);
  text-decoration: none;
  color: var(--text-main);
  transition: transform 0.3s cubic-bezier(0.2, 0.8, 0.2, 1), box-shadow 0.3s;
  border: 1px solid var(--border);
  display: flex;
  flex-direction: column;
}

.card:hover {
  transform: scale(1.02);
  box-shadow: 0 20px 40px rgba(0,0,0,0.08);
}

.card-icon {
  width: 64px;
  height: 64px;
  border-radius: 16px;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  border: 1px solid rgba(0,0,0,0.05);
}

.card-title { font-size: 1.4rem; font-weight: 600; margin-bottom: 8px; }
.card-desc { font-size: 1rem; color: var(--text-sub); margin-bottom: 24px; flex-grow: 1; }

.card-link {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent);
  display: flex;
  align-items: center;
}
.card-link::after { content: '→'; margin-left: 6px; transition: margin 0.2s; }
.card:hover .card-link::after { margin-left: 10px; }

/* Simple List for Info */
.info-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.info-item {
  display: flex;
  align-items: center;
  padding: 24px;
  background: var(--card-bg);
  border-radius: 16px;
  text-decoration: none;
  color: var(--text-main);
  transition: background 0.2s;
  border: 1px solid var(--border);
}
.info-item:hover { background: #fff; }
.info-text { flex-grow: 1; font-weight: 500; }
.info-arrow { color: var(--border); }

/* Footer */
footer {
  text-align: center;
  padding-top: 40px;
  border-top: 1px solid var(--border);
  color: var(--text-sub);
  font-size: 0.85rem;
}

/* Document Styles */
.prose { max-width: 680px; margin: 0 auto; }
.prose h1 { font-size: 2.5rem; font-weight: 700; margin-bottom: 40px; letter-spacing: -0.02em; }
.prose h2 { font-size: 1.5rem; margin: 60px 0 20px; border-bottom: none; }
.prose p, .prose li { color: var(--text-sub); font-size: 1.05rem; margin-bottom: 1.5em; }
.prose a { color: var(--accent); text-decoration: none; }
.prose a:hover { text-decoration: underline; }