/* AI SNS Delegation Site Styles */
:root {
  --font-body: "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Meiryo", sans-serif;
  --font-heading: "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Meiryo", sans-serif;
  --color-primary: #2d6cdf;
  --color-secondary: #5c33f6;
  --color-accent: #20d1cb;
  --color-text: #1c1c24;
  --color-muted: #757588;
  --color-bg: #f6f8fb;
  --color-panel: #ffffff;
  --shadow: 0 12px 32px rgba(23, 45, 87, 0.08);
  --max-width: 1080px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.75;
  letter-spacing: 0.02em;
}

a {
  color: var(--color-primary);
  text-decoration: none;
}

a:hover,
a:focus {
  text-decoration: underline;
}

header {
  background: linear-gradient(135deg, rgba(45, 108, 223, 0.92), rgba(92, 51, 246, 0.88));
  color: #ffffff;
  padding: 48px 24px;
  text-align: center;
  box-shadow: var(--shadow);
}

header h1 {
  margin: 0;
  font-family: var(--font-heading);
  font-size: 2.6rem;
  letter-spacing: 0.04em;
}

header p {
  margin: 16px auto 0;
  max-width: 720px;
  font-size: 1.05rem;
  opacity: 0.92;
}

nav {
  background: #ffffff;
  border-bottom: 1px solid rgba(30, 40, 80, 0.1);
  box-shadow: 0 4px 16px rgba(15, 28, 78, 0.06);
  position: sticky;
  top: 0;
  z-index: 10;
}

nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}

nav li {
  margin: 0;
}

nav a {
  display: block;
  padding: 16px 20px;
  border-radius: 12px;
  font-weight: 600;
  color: var(--color-text);
  transition: background 0.2s ease, color 0.2s ease;
}

nav a:hover,
nav a:focus,
nav a.active {
  background: rgba(45, 108, 223, 0.1);
  color: var(--color-primary);
}

main {
  max-width: var(--max-width);
  margin: 40px auto;
  padding: 0 24px 80px;
}

section {
  background: var(--color-panel);
  border-radius: 20px;
  padding: 32px 36px;
  margin-bottom: 32px;
  box-shadow: var(--shadow);
}

section h2 {
  font-family: var(--font-heading);
  font-size: 2rem;
  margin-top: 0;
  margin-bottom: 18px;
}

section h3 {
  font-size: 1.45rem;
  margin-bottom: 12px;
  margin-top: 32px;
}

section p {
  margin-bottom: 18px;
  font-size: 1.02rem;
}

.highlight {
  border-left: 6px solid var(--color-secondary);
  padding-left: 18px;
  background: linear-gradient(90deg, rgba(92, 51, 246, 0.08), rgba(32, 209, 203, 0.08));
  border-radius: 16px;
  padding-top: 18px;
  padding-bottom: 18px;
}

.grid {
  display: grid;
  gap: 24px;
}

.grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.card {
  background: rgba(255, 255, 255, 0.92);
  border-radius: 18px;
  padding: 24px;
  border: 1px solid rgba(40, 60, 120, 0.08);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 36px rgba(14, 30, 84, 0.12);
}

.card h4 {
  margin-top: 0;
  font-size: 1.25rem;
}

.card p {
  margin-bottom: 0;
}

figure {
  margin: 0 0 24px;
  border-radius: 18px;
  overflow: hidden;
  box-shadow: var(--shadow);
}

figure img {
  width: 100%;
  display: block;
  height: auto;
}

figure figcaption {
  padding: 16px 20px;
  background: rgba(13, 23, 50, 0.76);
  color: #ffffff;
  font-size: 0.95rem;
}

blockquote {
  margin: 24px 0;
  padding: 24px 28px;
  background: rgba(32, 209, 203, 0.12);
  border-left: 6px solid var(--color-accent);
  border-radius: 16px;
  font-style: italic;
}

table {
  width: 100%;
  border-collapse: collapse;
  box-shadow: var(--shadow);
  border-radius: 18px;
  overflow: hidden;
}

th,
td {
  padding: 16px 18px;
  text-align: left;
  border-bottom: 1px solid rgba(20, 30, 50, 0.08);
  font-size: 0.98rem;
}

th {
  background: rgba(45, 108, 223, 0.08);
}

footer {
  background: #0c1226;
  color: #e2e5f4;
  padding: 40px 24px;
  text-align: center;
}

footer nav ul {
  gap: 8px;
}

footer a {
  color: #e2e5f4;
  font-weight: 500;
}

.badge {
  display: inline-block;
  padding: 6px 12px;
  border-radius: 999px;
  background: rgba(45, 108, 223, 0.12);
  color: var(--color-primary);
  font-weight: 600;
  font-size: 0.85rem;
  margin-right: 8px;
}

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

.icon-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 18px;
}

.icon-list strong {
  color: var(--color-secondary);
}

@media (max-width: 768px) {
  header {
    padding: 40px 16px;
  }

  header h1 {
    font-size: 2.1rem;
  }

  nav a {
    padding: 12px 16px;
    font-size: 0.95rem;
  }

  section {
    padding: 28px 24px;
  }

  section h2 {
    font-size: 1.8rem;
  }

  figure figcaption {
    font-size: 0.88rem;
  }
}

@media (prefers-color-scheme: dark) {
  body {
    background: #080b14;
    color: #f0f3ff;
  }

  nav {
    background: rgba(12, 18, 38, 0.94);
    border-bottom: 1px solid rgba(90, 115, 200, 0.28);
  }

  nav a {
    color: #f0f3ff;
  }

  nav a:hover,
  nav a:focus,
  nav a.active {
    background: rgba(45, 108, 223, 0.22);
  }

  section {
    background: rgba(14, 23, 52, 0.92);
    color: #f0f3ff;
  }

  footer {
    background: #05070f;
  }
}