/* VrmAiFriend ランディングページ — 青系モダンデザイン */

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Segoe UI", "Hiragino Sans", "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
  color: #e8f0fe;
  background: linear-gradient(160deg, #0a1628 0%, #0d2847 40%, #1a4a7a 100%);
  line-height: 1.7;
}

a {
  color: inherit;
  text-decoration: none;
}

/* ナビ */
.site-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1080px;
  margin: 0 auto;
  padding: 1.25rem 1.5rem;
}

.back-link {
  font-size: 0.9rem;
  color: #7eb8ff;
  transition: color 0.2s;
}

.back-link:hover {
  color: #ffffff;
}

.nav-badge {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  padding: 0.35rem 0.85rem;
  border-radius: 999px;
  background: rgba(26, 111, 212, 0.35);
  border: 1px solid rgba(126, 184, 255, 0.35);
  color: #a8d4ff;
}

/* ヒーロー */
.hero {
  max-width: 1080px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.hero-text h1 {
  font-size: clamp(2.2rem, 5vw, 3.2rem);
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1.2;
  margin: 0 0 1rem;
  background: linear-gradient(135deg, #ffffff 0%, #7eb8ff 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-tagline {
  font-size: 1.15rem;
  color: #94b8e0;
  margin: 0 0 1.5rem;
}

.hero-desc {
  font-size: 0.95rem;
  color: #b8cfe8;
  margin: 0 0 2rem;
}

.hero-platforms {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 2rem;
}

.platform-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  padding: 0.4rem 0.9rem;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(126, 184, 255, 0.25);
  color: #c8dff5;
}

.hero-visual img {
  width: 100%;
  border-radius: 20px;
  box-shadow: 0 24px 48px rgba(0, 40, 100, 0.5);
  border: 1px solid rgba(126, 184, 255, 0.2);
}

/* ダウンロード */
.download-section {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 1.5rem 4rem;
}

.download-card {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(126, 184, 255, 0.25);
  border-radius: 20px;
  padding: 2.5rem;
  backdrop-filter: blur(12px);
  text-align: center;
}

.download-card h2 {
  margin: 0 0 0.5rem;
  font-size: 1.5rem;
  color: #ffffff;
}

.download-version {
  font-size: 0.9rem;
  color: #7eb8ff;
  margin: 0 0 2rem;
}

.download-buttons {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.btn-download {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.9rem 1.8rem;
  border-radius: 12px;
  font-size: 1rem;
  font-weight: 600;
  transition: transform 0.2s, box-shadow 0.2s, background 0.2s;
}

.btn-download.primary {
  background: linear-gradient(135deg, #1a6fd4 0%, #0d4a8a 100%);
  color: #ffffff;
  box-shadow: 0 8px 24px rgba(26, 111, 212, 0.4);
}

.btn-download.primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(26, 111, 212, 0.55);
}

.btn-download.secondary {
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(126, 184, 255, 0.35);
  color: #e8f0fe;
}

.btn-download.secondary:hover {
  background: rgba(255, 255, 255, 0.16);
  transform: translateY(-2px);
}

.download-note {
  font-size: 0.85rem;
  color: #7a9ec0;
  margin: 0;
}

.download-note a {
  color: #7eb8ff;
  text-decoration: underline;
  text-underline-offset: 2px;
}

/* セクション共通 */
.section {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 1.5rem 4rem;
}

.section-label {
  text-align: center;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: #5a9fd4;
  margin: 0 0 0.75rem;
}

.section h2 {
  text-align: center;
  font-size: 1.75rem;
  font-weight: 600;
  color: #ffffff;
  margin: 0 0 2rem;
}

/* ハイライトカード */
.highlight-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.highlight-card {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(126, 184, 255, 0.18);
  border-radius: 16px;
  padding: 1.5rem;
  transition: border-color 0.25s, transform 0.25s;
}

.highlight-card:hover {
  border-color: rgba(126, 184, 255, 0.45);
  transform: translateY(-4px);
}

.highlight-card .icon {
  font-size: 1.5rem;
  margin-bottom: 0.75rem;
}

.highlight-card h3 {
  margin: 0 0 0.5rem;
  font-size: 1rem;
  color: #ffffff;
}

.highlight-card p {
  margin: 0;
  font-size: 0.88rem;
  color: #94b8e0;
}

/* 機能一覧 */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.feature-item {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 1rem 1.25rem;
  background: rgba(255, 255, 255, 0.04);
  border-radius: 12px;
  border: 1px solid rgba(126, 184, 255, 0.12);
}

.feature-item .check {
  flex-shrink: 0;
  width: 1.4rem;
  height: 1.4rem;
  border-radius: 50%;
  background: rgba(26, 111, 212, 0.35);
  color: #7eb8ff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  margin-top: 0.15rem;
}

.feature-item span {
  font-size: 0.92rem;
  color: #c8dff5;
}

/* 必要環境 */
.requirements-table {
  width: 100%;
  border-collapse: collapse;
  background: rgba(255, 255, 255, 0.04);
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid rgba(126, 184, 255, 0.18);
}

.requirements-table th,
.requirements-table td {
  padding: 1rem 1.25rem;
  text-align: left;
  border-bottom: 1px solid rgba(126, 184, 255, 0.1);
}

.requirements-table th {
  width: 30%;
  font-weight: 600;
  color: #7eb8ff;
  background: rgba(10, 30, 60, 0.5);
}

.requirements-table td {
  color: #c8dff5;
  font-size: 0.92rem;
}

.requirements-table tr:last-child th,
.requirements-table tr:last-child td {
  border-bottom: none;
}

.requirements-table a {
  color: #7eb8ff;
  text-decoration: underline;
  text-underline-offset: 2px;
}

/* インストール手順 */
.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.step-card {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(126, 184, 255, 0.18);
  border-radius: 16px;
  padding: 1.75rem;
}

.step-card h3 {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin: 0 0 1rem;
  font-size: 1.05rem;
  color: #ffffff;
}

.step-card .os-icon {
  font-size: 1.3rem;
}

.step-card ol {
  margin: 0;
  padding-left: 1.25rem;
  color: #b8cfe8;
  font-size: 0.9rem;
}

.step-card li {
  margin-bottom: 0.5rem;
}

.step-card li:last-child {
  margin-bottom: 0;
}

.step-note {
  margin-top: 1rem;
  padding: 0.75rem 1rem;
  background: rgba(26, 111, 212, 0.15);
  border-radius: 8px;
  font-size: 0.82rem;
  color: #94b8e0;
}

/* フッター */
.site-footer {
  text-align: center;
  padding: 2.5rem 1.5rem;
  font-size: 0.85rem;
  color: #5a8ab0;
  border-top: 1px solid rgba(126, 184, 255, 0.15);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.5rem;
  margin-bottom: 1rem;
}

.footer-links a {
  color: #7eb8ff;
  transition: color 0.2s;
}

.footer-links a:hover {
  color: #ffffff;
}

/* レスポンシブ */
@media (max-width: 768px) {
  .hero {
    grid-template-columns: 1fr;
    gap: 2rem;
    padding-top: 1rem;
  }

  .hero-visual {
    order: -1;
  }

  .download-card {
    padding: 1.75rem 1.25rem;
  }

  .requirements-table th,
  .requirements-table td {
    display: block;
    width: 100%;
  }

  .requirements-table th {
    border-bottom: none;
    padding-bottom: 0.25rem;
  }

  .requirements-table td {
    padding-top: 0;
  }
}