* {
  box-sizing: border-box;
}

:root {
  --bg: #eef1fa;
  --bg-accent1: #dfe7fb;
  --bg-accent2: #fde8f3;
  --surface: #ffffff;
  --text: #1f2333;
  --text-muted: #6b7280;
  --border: #e6e8f0;
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --shadow: 0 4px 16px rgba(76, 81, 148, 0.08);
  --shadow-hover: 0 8px 24px rgba(76, 81, 148, 0.14);
  --radius: 14px;
}

body {
  margin: 0;
  font-family: "Hiragino Kaku Gothic ProN", "Yu Gothic", "Meiryo", -apple-system, sans-serif;
  background:
    radial-gradient(1200px 500px at 10% -10%, var(--bg-accent1), transparent),
    radial-gradient(1000px 500px at 100% 0%, var(--bg-accent2), transparent),
    var(--bg);
  background-attachment: fixed;
  color: var(--text);
  min-height: 100vh;
}

.app {
  max-width: 1080px;
  margin: 0 auto;
  padding: 32px 20px 64px;
}

header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 32px;
}

.header-icon {
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  background: linear-gradient(135deg, var(--primary), #8b5cf6);
  border-radius: 14px;
  box-shadow: 0 6px 16px rgba(99, 102, 241, 0.35);
}

header h1 {
  font-size: 26px;
  font-weight: 800;
  margin: 0;
  letter-spacing: 0.5px;
  background: linear-gradient(90deg, var(--primary-dark), #7c3aed);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.header-sub {
  margin: 2px 0 0;
  font-size: 13px;
  color: var(--text-muted);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 20px;
}

.card {
  display: block;
  background: var(--surface);
  border-radius: var(--radius);
  padding: 24px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  text-decoration: none;
  color: var(--text);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
}

.card-icon {
  font-size: 28px;
  margin-bottom: 10px;
}

.card-title {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 6px;
}

.card-desc {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.5;
}