:root{
  --color-primary:#123a5c;   /* KIUN 蓝 */
  --color-accent:#f5b400;    /* EC 黄 */
  --color-bg:#f7f7f7;
  --color-text:#222;
  --max-width:1120px;
}

/* ===== Reset / Base ===== */
*{box-sizing:border-box;margin:0;padding:0;}
html,body{width:100%;}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Yu Gothic","YuGothic","Noto Sans JP",sans-serif;
  color:var(--color-text);
  background:#fff;
  line-height:1.6;
}
a{color:inherit;text-decoration:none;}
img{max-width:100%;height:auto;display:block;}

/* ===== Layout helper ===== */
.container{
  width:100%;
  max-width:var(--max-width);
  margin:0 auto;
  padding:0 16px;
}

/* ===== Header (Global) ===== */
.site-header{
  border-bottom:1px solid #eee;
  position:sticky;
  top:0;
  z-index:1000;
  background:#fff;
}
.header-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  padding:12px 0;
  min-height:64px;
}
.logo-wrap{
  display:flex;
  align-items:center;
  gap:12px;
  min-width:0;
}
.logo-wrap a{display:inline-flex;align-items:center;}
.logo-wrap img{height:40px;width:auto;}
.logo-text{
  font-weight:700;
  font-size:16px;
  color:var(--color-primary);
  white-space:nowrap;
}

/* Nav (PC) */
.site-nav{
  display:flex;
  align-items:center;
  gap:16px;
  font-size:14px;
  line-height:1.3;

  /* 关键：避免被“稀释” */
  flex-wrap:nowrap;
  min-width:0;
}
.nav-links{
  display:flex;
  align-items:center;
  gap:16px;

  /* 关键：links 允许伸缩，按钮保持不动 */
  flex:1 1 auto;
  min-width:0;
}
.nav-links a{
  padding:4px 0;
  position:relative;
  white-space:nowrap;
}
.nav-links a::after{
  content:"";
  position:absolute;
  left:0;
  bottom:-3px;
  width:0;
  height:2px;
  background:var(--color-primary);
  transition:width .2s ease;
}
.nav-links a:hover::after{width:100%;}

/* CTA wrapper (PC) */
.nav-ctas{
  display:flex;
  align-items:center;
  gap:12px;

  /* 关键：按钮不参与分配空间 */
  flex:0 0 auto;
}

/* Buttons (强制在 header nav 下生效，避免被页面内 CSS 覆盖) */
.site-header .site-nav .btn-amazon,
.site-header .site-nav .btn-ec{
  border-radius:999px;
  padding:10px 16px;
  font-weight:800;
  font-size:13px;
  white-space:nowrap;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:6px;
  line-height:1.15;

  /* 关键：避免被页面内 a/button 样式影响 */
  border:0 !important;
  opacity:1 !important;
  background-image:none !important;
  text-shadow:none !important;
}

/* Amazon 蓝 */
.site-header .site-nav .btn-amazon{
  background-color:var(--color-primary) !important;
  color:#fff !important;
}
.site-header .site-nav .btn-amazon small{
  font-size:11px;
  opacity:.9;
  font-weight:700;
}

/* EC 黄（锁死背景色，解决 index 透明问题） */
.site-header .site-nav .btn-ec{
  background-color:var(--color-accent) !important;
  color:#1b1b1b !important;
  box-shadow:0 2px 0 rgba(0,0,0,.10);
}
.site-header .site-nav .btn-ec small{
  font-size:11px;
  opacity:.85;
  font-weight:800;
}

/* Hamburger */
.nav-toggle{
  display:none;
  flex-direction:column;
  gap:5px;
  cursor:pointer;
  user-select:none;
}
.nav-toggle span{
  width:24px;
  height:2px;
  background:#333;
  border-radius:2px;
}

/* Nav (Mobile) */
@media (max-width:768px){
  .nav-toggle{display:flex;}

  .site-nav{
    position:absolute;
    left:0;
    right:0;
    top:64px;
    background:#fff;
    border-bottom:1px solid #eee;
    padding:10px 16px 14px;
    display:none;
    flex-direction:column;
    align-items:flex-start;
    gap:10px;
    z-index:1001;
  }
  .site-nav.open{display:flex;}

  .nav-links{
    width:100%;
    flex-direction:column;
    align-items:flex-start;
    gap:0;
  }
  .nav-links a{
    width:100%;
    padding:12px 0;
    font-size:16px;
    border-bottom:1px solid #f0f0f0;
  }
  .nav-links a::after{display:none;}

  .nav-ctas{
    width:100%;
    flex-direction:column;
    gap:10px;
  }
  .site-header .site-nav .btn-ec,
  .site-header .site-nav .btn-amazon{
    width:100%;
    text-align:center;
    padding:14px 16px;
    font-size:15px;
  }
  .site-header .site-nav .btn-ec small,
  .site-header .site-nav .btn-amazon small{
    display:block;
    margin-top:3px;
  }
}

/* ===== Footer (Global) ===== */
.site-footer{
  border-top:1px solid #eee;
  padding:20px 0;
  font-size:12px;
  color:#777;
  margin-top:24px;
}
.footer-inner{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  justify-content:space-between;
  align-items:center;
}
.footer-links{
  display:flex;
  gap:16px;
  flex-wrap:wrap;
}
.footer-links a{color:#777;}
.footer-links a:hover{color:var(--color-primary);}

@media (max-width:600px){
  .footer-inner{
    flex-direction:column;
    align-items:flex-start;
  }
}