/* =============================================
   rika-apps.com — 共通スタイル
   白系・上品で可愛い、繊細なデザイン
   ダークモード / ライトモード自動切替
   ============================================= */

/* --- リセット & ベース --- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  /* ライトモード（メイン） — 白を基調に、ほんのりピンクベージュ系 */
  --color-bg: #faf9f7;
  --color-surface: #ffffff;
  --color-text: #2c2c2e;
  --color-text-secondary: #7c7c80;
  --color-text-tertiary: #a8a8ac;
  --color-border: rgba(0, 0, 0, 0.06);
  --color-accent: #b4838d;
  --color-accent-light: #d4a9b0;
  --color-accent-hover: #96636e;
  --color-accent-bg: rgba(180, 131, 141, 0.06);
  --color-card-shadow: 0 1px 3px rgba(0, 0, 0, 0.04), 0 4px 12px rgba(0, 0, 0, 0.03);
  --color-card-shadow-hover: 0 2px 8px rgba(0, 0, 0, 0.06), 0 8px 24px rgba(0, 0, 0, 0.06);
  --color-footer-bg: #f4f3f1;
  --color-divider: rgba(0, 0, 0, 0.05);
  --radius-card: 16px;
  --radius-sm: 10px;
  --max-width: 880px;
  --transition: 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --font-base: 16px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #0e0e0e;
    --color-surface: #1a1a1c;
    --color-text: #f0eeec;
    --color-text-secondary: #918f8d;
    --color-text-tertiary: #5c5a58;
    --color-border: rgba(255, 255, 255, 0.07);
    --color-accent: #d4a9b0;
    --color-accent-light: #b4838d;
    --color-accent-hover: #e4c4c9;
    --color-accent-bg: rgba(212, 169, 176, 0.08);
    --color-card-shadow: 0 1px 3px rgba(0, 0, 0, 0.2), 0 4px 12px rgba(0, 0, 0, 0.15);
    --color-card-shadow-hover: 0 2px 8px rgba(0, 0, 0, 0.25), 0 8px 24px rgba(0, 0, 0, 0.2);
    --color-footer-bg: #141414;
    --color-divider: rgba(255, 255, 255, 0.05);
  }
}

html {
  font-size: var(--font-base);
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family:
    -apple-system, BlinkMacSystemFont,
    "Hiragino Kaku Gothic ProN", "Hiragino Sans",
    "Yu Gothic UI", "Segoe UI",
    Meiryo, sans-serif;
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.75;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  letter-spacing: 0.01em;
}

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

a:hover {
  color: var(--color-accent-hover);
}

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

/* --- レイアウト --- */
.site-container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

main {
  flex: 1;
}

/* --- ヘッダー --- */
.site-header {
  padding: 24px 0 12px;
  border-bottom: 1px solid var(--color-divider);
}

.site-header .site-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-logo {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.01em;
}

.site-logo:hover {
  color: var(--color-text);
}

.site-nav {
  display: flex;
  gap: 24px;
}

.site-nav a {
  font-size: 0.82rem;
  color: var(--color-text-secondary);
  font-weight: 500;
  transition: color var(--transition);
  letter-spacing: 0.02em;
}

.site-nav a:hover {
  color: var(--color-accent);
}

/* --- ヒーロー / サイト紹介 --- */
.hero {
  padding: 60px 0 40px;
  text-align: center;
}

.hero-title {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
  color: var(--color-text);
}

.hero-sub {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  max-width: 460px;
  margin: 0 auto;
  line-height: 1.9;
}

/* --- セクション共通 --- */
.section {
  padding: 36px 0;
}

.section-title {
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-text-tertiary);
  margin-bottom: 20px;
}

.section-divider {
  height: 1px;
  background: var(--color-divider);
  margin: 0 0 36px;
  border: none;
}

/* --- アプリ一覧カード --- */
.app-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
}

.app-card {
  display: flex;
  flex-direction: column;
  background: var(--color-surface);
  border-radius: var(--radius-card);
  padding: 28px 24px;
  box-shadow: var(--color-card-shadow);
  border: 1px solid var(--color-border);
  transition:
    box-shadow var(--transition),
    transform var(--transition),
    border-color var(--transition);
  color: var(--color-text);
}

.app-card:hover {
  box-shadow: var(--color-card-shadow-hover);
  transform: translateY(-3px);
  color: var(--color-text);
  border-color: var(--color-accent-light);
}

.app-card-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--color-accent-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}

.app-card-icon svg {
  width: 22px;
  height: 22px;
  stroke: var(--color-accent);
  fill: none;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.app-card-title {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 8px;
  letter-spacing: -0.01em;
}

.app-card-desc {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  margin-bottom: 16px;
  line-height: 1.7;
  flex: 1;
}

.app-card-link {
  font-size: 0.78rem;
  color: var(--color-accent);
  font-weight: 500;
  letter-spacing: 0.01em;
}

/* --- ブログ新着 --- */
.recent-posts {
  list-style: none;
}

.recent-post-item {
  padding: 18px 0;
  border-bottom: 1px solid var(--color-divider);
}

.recent-post-item:last-child {
  border-bottom: none;
}

.recent-post-date {
  font-size: 0.75rem;
  color: var(--color-text-tertiary);
  display: block;
  margin-bottom: 4px;
  letter-spacing: 0.04em;
}

.recent-post-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-text);
  transition: color var(--transition);
}

.recent-post-title:hover {
  color: var(--color-accent);
}

.more-link {
  display: inline-block;
  margin-top: 18px;
  font-size: 0.85rem;
  font-weight: 500;
}

/* --- フッター --- */
.site-footer {
  background: var(--color-footer-bg);
  padding: 32px 0;
  margin-top: 48px;
  border-top: 1px solid var(--color-divider);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  font-size: 0.78rem;
  color: var(--color-text-secondary);
  font-weight: 500;
}

.footer-links a:hover {
  color: var(--color-accent);
}

.footer-copy {
  font-size: 0.72rem;
  color: var(--color-text-tertiary);
  letter-spacing: 0.02em;
}

/* --- ページヘッダー（下層ページ用） --- */
.page-header {
  padding: 36px 0 20px;
}

.page-header h1 {
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

/* --- ページ本文（下層ページ用） --- */
.page-body {
  padding-bottom: 40px;
  max-width: 640px;
}

.page-body h2 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-top: 36px;
  margin-bottom: 12px;
  color: var(--color-text);
}

.page-body p {
  margin-bottom: 16px;
  line-height: 1.9;
  color: var(--color-text-secondary);
}

.page-body ul {
  margin-bottom: 16px;
  padding-left: 1.5em;
}

.page-body li {
  margin-bottom: 8px;
  line-height: 1.85;
  color: var(--color-text-secondary);
}

.page-body a {
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: var(--color-accent-light);
}

/* --- パンくずリスト --- */
.breadcrumb {
  font-size: 0.78rem;
  color: var(--color-text-tertiary);
  padding: 20px 0 0;
}

.breadcrumb a {
  color: var(--color-text-secondary);
}

.breadcrumb span {
  margin: 0 8px;
  color: var(--color-text-tertiary);
}

/* --- お問い合わせカード --- */
.contact-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 48px 32px;
  text-align: center;
  margin-top: 24px;
}

.contact-card-title {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--color-text);
}

.contact-card-desc {
  font-size: 0.88rem;
  color: var(--color-text-secondary);
  margin-bottom: 28px;
}

.contact-btn {
  display: inline-block;
  background: var(--color-accent);
  color: #fff;
  padding: 12px 36px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.88rem;
  transition: opacity var(--transition), transform var(--transition);
  letter-spacing: 0.02em;
}

.contact-btn:hover {
  opacity: 0.88;
  color: #fff;
  transform: translateY(-1px);
}

.contact-note {
  font-size: 0.75rem;
  color: var(--color-text-tertiary);
  margin-top: 20px;
}

/* --- レスポンシブ --- */
@media (max-width: 600px) {
  .site-container {
    padding: 0 20px;
  }

  .hero {
    padding: 44px 0 28px;
  }

  .hero-title {
    font-size: 1.3rem;
  }

  .hero-sub {
    font-size: 0.88rem;
  }

  .app-grid {
    grid-template-columns: 1fr;
  }

  .site-header .site-container {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .page-header h1 {
    font-size: 1.2rem;
  }

  .contact-card {
    padding: 36px 20px;
  }
}