@charset "UTF-8";
/*
Theme Name: hs style Theme
Version: 1.0
*/

/* ==========================================================================
   1. 変数定義 (Variables)
   ========================================================================== */
:root {
  --primary: #dc2626;
  --primary-hover: #b91c1c;
  --text-main: #1e293b;
  --text-muted: #64748b;
  --bg-light: #f8fafc;
  --bg-dark: #0f172a;
  --white: #ffffff;
  --border-color: #e2e8f0;
  
  --container-width: 1200px;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 8rem;
}

/* ==========================================================================
   2. リセット & ベース (Reset & Base)
   ========================================================================== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, sans-serif;
  color: var(--text-main);
  background-color: var(--white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { text-decoration: none; color: inherit; transition: color 0.3s; }
ul, ol { list-style: none; }
img { max-width: 100%; height: auto; display: block; }
button, select, input, textarea { font-family: inherit; }
button { cursor: pointer; border: none; background: none; }

::selection { background-color: var(--primary); color: var(--white); }

/* ==========================================================================
   3. ユーティリティ & アニメーション
   ========================================================================== */
.container { max-width: var(--container-width); margin: 0 auto; padding: 0 20px; }
.section { padding: var(--space-xl) 0; }
.section-sm { padding: var(--space-lg) 0; }
.bg-light { background-color: var(--bg-light); }
.bg-dark { background-color: var(--bg-dark); color: var(--white); }
.text-center { text-align: center; }
.text-primary { color: var(--primary); }

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.grid { display: grid; gap: 2rem; }
@media (min-width: 768px) {
  .grid-2 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
  .grid-4 { grid-template-columns: repeat(4, 1fr); }
}

/* ==========================================================================
   4. ヘッダー (Header)
   ========================================================================== */
.site-header {
  position: fixed; top: 0; left: 0; width: 100%; z-index: 1000;
  padding: 1.5rem 0; transition: all 0.3s ease;
  background: transparent; color: var(--white);
}

.site-header.is-solid {
  background: rgba(255, 255, 255, 0.95); backdrop-filter: blur(10px);
  box-shadow: 0 2px 10px rgba(0,0,0,0.05); padding: 0.75rem 0; color: var(--text-main);
}

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

.logo { display: flex; align-items: center; gap: 0.5rem; font-size: 1.5rem; font-weight: 900; }
.logo-icon {
  width: 40px; height: 40px; border-radius: 8px; display: flex; align-items: center; justify-content: center;
  background: var(--white); color: var(--primary); transition: transform 0.3s, background 0.3s;
}
.site-header.is-solid .logo-icon { background: var(--primary); color: var(--white); }
.logo:hover .logo-icon { transform: rotate(6deg); }

.desktop-nav { display: none; align-items: center; gap: 2rem; }
@media (min-width: 1024px) { .desktop-nav { display: flex; } }

.nav-link { font-weight: bold; font-size: 0.9rem; opacity: 0.9; transition: opacity 0.3s, color 0.3s; }
.nav-link:hover { opacity: 1; color: var(--primary); }
.nav-link.is-active { color: var(--primary); text-decoration: underline; text-underline-offset: 8px; opacity: 1; }
.site-header.is-solid .nav-link { color: var(--text-muted); }

.sns-links { display: flex; gap: 1rem; padding-left: 1rem; border-left: 1px solid rgba(255,255,255,0.3); }
.site-header.is-solid .sns-links { border-color: var(--border-color); }

.btn {