:root {
			--gunmetal-900: #1f252c;
			--gunmetal-800: #283039;
			--gunmetal-700: #333c46;
			--gunmetal-500: #5e6975;
			--accent: #10b36f;
			--accent-strong: #0b8e58;
			--ink: #ecf1f4;
			--card: rgba(40, 48, 57, 0.78);
			--line: rgba(228, 238, 244, 0.2);
			--shadow: 0 14px 30px rgba(8, 12, 16, 0.45);
		}
		
  body{
    margin: 0;
    font-family: "Noto Sans JP", sans-serif;
    color: #ecf1f4;
    background: radial-gradient(circle at 12% 18%, rgba(16, 179, 111, 0.24), transparent 45%), radial-gradient(circle at 90% 10%, rgba(104, 122, 136, 0.2), transparent 30%), linear-gradient(130deg, #1f252c 0%, #2b333d 45%, #20272f 100%);
    min-height: 100vh;
  }

	.back-toppage{
    color: var(--accent);
    font-weight: 700;
    text-decoration: none;
	}
	.back-toppage:hover{
		text-decoration: underline;
	}
	
	.breadcrumbs{
		opacity:0.5;
		padding:0;
		margin:0;
	}
  .site-shell {
    min-height: 100vh;
    display: grid;
    grid-template-rows: auto 1fr auto;
  }

  .site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 0.7rem 1rem;
    border-bottom: 1px solid rgba(228, 238, 244, 0.2);
    background: rgba(30, 37, 45, 0.82);
    backdrop-filter: blur(8px);
  }

  .brand {
    font-style: italic;
    font-family: "Bebas Neue", sans-serif;
    letter-spacing: 0.09em;
    font-size: clamp(1.35rem, 3vw, 2rem);
    color: var(--accent);
    text-decoration: none;
  }

  nav {
    display: flex;
    gap: 0.9rem;
    flex-wrap: wrap;
    align-items: center;
  }

  nav a {
    color: #ecf1f4;
    text-decoration: none;
    font-weight: 700;
    opacity: 0.9;
		margin-right:1em;
  }

  nav a:hover {
    color: #10b36f;
    opacity: 1;
  }

  .nav-toggle {
    display: none;
    width: 42px;
    height: 42px;
    border: 1px solid rgba(228, 238, 244, 0.32);
    background: rgba(44, 54, 64, 0.78);
    border-radius: 10px;
    padding: 9px 8px;
    cursor: pointer;
  }

  .nav-toggle span {
    display: block;
    width: 100%;
    height: 2px;
    background: #ecf1f4;
    border-radius: 999px;
  }

  .nav-toggle span + span {
    margin-top: 6px;
  }

  .site-main {
    width: 100%!important;
    margin: 1.2rem auto;
		margin-top:0;
		overflow:auto;
  }

  .site-footer {
    border-top: 1px solid rgba(228, 238, 244, 0.2);
    padding: 1rem 1.2rem 1.4rem;
    color: rgba(236, 241, 244, 0.8);
  }

	.btn{
		display: inline-block;
		padding: 0.4rem 0.9rem;
		background: var(--accent);
		color: var(--ink);
		border: 1px solid var(--gunmetal-700);
		border-radius: 25px;
		font-weight: 600;
		font-size: 0.8rem;
		cursor: pointer;
		text-decoration: none;
		transition: all 0.2s ease;
	}
	
	.btn:hover,.btn:active {
		background: var(--accent);
		color: var(--gunmetal-900);
		border-color: var(--accent);
		transform: translateY(-2px);
	}

	/*スマホサイズ*/
  @media (max-width: 720px) {
    .site-header {
      display: grid;
      grid-template-columns: 1fr auto;
      align-items: center;
      gap: 0.8rem;
    }
		.brand {
			font-style: italic;
			font-family: "Bebas Neue", sans-serif;
			letter-spacing: 0.09em;
			font-size: clamp(1.8rem, 3vw, 2rem);
			color: var(--accent);
			text-decoration: none;
		}

    .nav-toggle {
      display: inline-block;
    }

    nav {
      grid-column: 1 / -1;
      width: 100%;
      display: grid;
      gap: 0;
      border: 1px solid rgba(228, 238, 244, 0.2);
      border-radius: 10px;
      overflow: hidden;
      max-height: 0;
      opacity: 0;
      pointer-events: none;
      transition: max-height 0.25s ease, opacity 0.2s ease;
      background: rgba(35, 43, 52, 0.9);
    }

    nav.open {
      max-height: 200px;
      opacity: 1;
      pointer-events: auto;
    }

    nav a {
      display: block;
      padding: 0.78rem 0.9rem;
      border-bottom: 1px solid rgba(228, 238, 244, 0.12);
    }

    nav a:last-child {
      border-bottom: 0;
    }

    .site-main {
      width: 100%!important;
			overflow-x: hidden;
    }

  }