body { font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "Hiragino Kaku Gothic ProN", "Noto Sans JP", sans-serif; margin: 0; padding: 0; color: #f1f5f9; background-color: #000000; background-image: url(../img/aori-car-bak.jpg); background-attachment: fixed; background-repeat: no-repeat; background-position: center center; background-size: cover; }
.info { counter-reset: item-counter; margin: 0; padding: 0; color: #cbd5e1; }
.info dt { font-weight: bold; margin-top: 10px; margin: 0 0 8px 10px; }
.info dd { margin: 0 0 8px 10px; font-size: clamp(14px, 0.9rem + 0.3vw, 16px); display: list-item; list-style-type: decimal; list-style-position: inside; }
header { background-color: rgba(13, 14, 18, 0.85); color: #ffffff; padding: 15px 10px; text-align: center; border-bottom: 1px solid #1f222c; backdrop-filter: blur(10px); }
header h1 { margin: 0 0 20px 0; font-size: clamp(14px, 8.00px + 1.56vw, 24px); font-weight: 800; letter-spacing: 0.08em; text-shadow: 0 2px 4px rgba(0,0,0,0.5); }
header nav { display: flex; flex-wrap: wrap; flex-direction: row; align-items: center; justify-content: center; }
header nav ul { display: flex; flex-wrap: wrap; flex-direction: row; align-items: center; justify-content: center; list-style: none; padding: 0; margin: 0; gap: 10px; }
header nav ul li { margin: 0; }
header nav a.btn-x { box-sizing: border-box; display: inline-flex; align-items: center; justify-content: center; background: #1f222c; color: #e2e8f0; padding: 8px 16px; text-decoration: none; border-radius: 4px; cursor: pointer; font-size: 14px; font-weight: 600; border: 1px solid #333848; transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1); }
header nav a.btn-x.current { background: #dc2626; color: #ffffff; border-color: #ef4444; box-shadow: 0 0 12px rgba(220, 38, 38, 0.5); pointer-events: none; }
header nav a.btn-x:hover { background: #dc2626; color: #ffffff; border-color: #ef4444; box-shadow: 0 0 12px rgba(220, 38, 38, 0.5); transform: translateY(-2px); }
header nav a.btn-x:active { transform: translateY(0); box-shadow: 0 0 4px rgba(220, 38, 38, 0.3); }
main { background-color: rgba(13, 14, 18, 0.85); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); padding: 35px 30px; max-width: 1100px; margin: 20px auto !important; box-sizing: border-box; border-radius: 8px; border: 1px solid #1f222c; box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5); }
.date-box { text-align: right; margin-top: 40px; border-top: 1px dashed #333848; padding-top: 20px; }
.date-box p { display: inline-block; font-size: 13px; color: #94a3b8; margin: 0; }
.btn, .box-switch-btn { box-sizing: border-box; display: inline-flex; align-items: center; justify-content: center; text-decoration: none; cursor: pointer; font-weight: 600; border-radius: 4px; transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1); border: none; white-space: nowrap; }
.btn { background: #dc2626; color: #fff; padding: 8px 16px; font-size: 13px; margin: 5px; box-shadow: 0 2px 8px rgba(220, 38, 38, 0.3); }
.btn:hover { background: #b91c1c; transform: translateY(-1px); box-shadow: 0 4px 12px rgba(220, 38, 38, 0.5); }
.box-switch-btn { background-color: #1f222c; color: #e2e8f0; padding: 10px 24px; font-size: 14px; border: 1px solid #333848; margin-top: 5px; }
.box-switch-btn:hover { background-color: #dc2626; color: #ffffff; border-color: #ef4444; box-shadow: 0 0 12px rgba(220, 38, 38, 0.4); transform: translateY(-1px); }
.info-banner { background: rgba(30, 41, 59, 0.6); border: 1px solid #38bdf8; padding: 12px 16px; border-radius: 6px; font-weight: 700; font-size: clamp(14px, 0.95rem + 0.2vw, 17px); margin-top: 28px; margin-bottom: 16px; color: #38bdf8; box-shadow: 0 0 15px rgba(56, 189, 248, 0.1); letter-spacing: 0.03em; }
.scroll-nav-group { position: fixed; bottom: 25px; right: 25px; display: flex; flex-direction: column; gap: 10px; z-index: 9999; }
.scroll-nav-group button { width: 48px; height: 48px; background-color: #1f222c; color: #e2e8f0; border: 1px solid #333848; border-radius: 50%; font-size: 16px; font-weight: bold; cursor: pointer; box-shadow: 0 4px 12px rgba(0,0,0,0.4); display: none; align-items: center; justify-content: center; transition: all 0.2s ease; }
.scroll-nav-group button:hover { background-color: #dc2626; border-color: #ef4444; color: #fff; transform: translateY(-2px); }
footer { text-align: center; padding: 30px 20px; font-size: clamp(11px, 0.75rem + 0.2vw, 13px); color: #475569; margin-top: 40px; border-top: 1px solid #1f222c; }
/* 1. デスクトップ・大画面タブレットPC (1024px以上) */
@media screen and (min-width: 1024px) {
    header nav ul { gap: 10px; }
    header nav a.btn-x { padding: 8px 16px; font-size: 14px; }
    main { padding: 35px 30px; margin: 20px auto !important; }
    .date-box { margin-top: 40px; padding-top: 20px; }
    .date-box p { font-size: 13px; }
    .btn { padding: 8px 16px; font-size: 13px; margin: 5px; }
    .box-switch-btn { padding: 10px 24px; font-size: 14px; }
    .info-banner { padding: 12px 16px; font-size: 16px; margin-top: 28px; margin-bottom: 16px; }
    .scroll-nav-group { bottom: 25px; right: 25px; gap: 10px; }
    .scroll-nav-group button { width: 48px; height: 48px; font-size: 16px; }
    footer { padding: 30px 20px; font-size: 13px; margin-top: 40px; }
}

/* 2. 一般的なタブレット・横向き端末 (835px 〜 1023px) */
@media (min-width: 835px) and (max-width: 1023px) {
    main { padding: 30px 25px; margin: 20px 20px !important; }
    header nav ul { gap: 8px; }
    header nav a.btn-x { padding: 8px 14px; font-size: 13px; }
    .info-banner { padding: 12px 15px; font-size: 15px; }
}

/* 3. iPadなど中型タブレット (744px 〜 834px) */
@media (min-width: 744px) and (max-width: 834px) {
    main { padding: 25px 20px; margin: 20px 15px !important; }
    header nav ul { gap: 6px; }
    header nav a.btn-x { padding: 7px 12px; font-size: 13px; }
    .btn { padding: 8px 14px; font-size: 13px; }
    .box-switch-btn { padding: 9px 22px; font-size: 13px; }
}

/* 4. 大型スマホ・小型タブレット (541px 〜 743px) */
@media (min-width: 541px) and (max-width: 743px) {
    main { padding: 22px 18px; margin: 15px 12px !important; }
    header h1 { margin: 0 0 15px 0; }
    header nav ul { gap: 6px; }
    header nav a.btn-x { padding: 6px 10px; font-size: 12px; }
    .btn { padding: 7px 12px; font-size: 12px; }
    .box-switch-btn { padding: 8px 18px; font-size: 13px; }
}

/* 5. 標準的なスマートフォン横・縦持ち幅 (441px 〜 540px) */
@media (min-width: 441px) and (max-width: 540px) {
    header nav ul { display: grid; grid-template-columns: repeat(4, 1fr); gap: 5px; width: 100%; }
    header nav a.btn-x { display: flex; padding: 6px 4px; font-size: 12px; width: 100%; text-align: center; }
    main { padding: 20px 15px; margin: 15px 10px !important; }
}

/* 6. iPhone Pro Max / Plusクラスのスマホ (391px 〜 440px) */
@media (min-width: 391px) and (max-width: 440px) {
    header nav ul { display: grid; grid-template-columns: repeat(4, 1fr); gap: 4px; width: 100%; }
    header nav a.btn-x { display: flex; padding: 6px 2px; font-size: 11px; width: 100%; }
    main { padding: 18px 12px; margin: 12px 8px !important; }
    .info dd { font-size: 14px; margin-left: 5px; }
}

/* 7. 一般的なスマートフォン縦持ち幅 (381px 〜 390px) */
@media (min-width: 381px) and (max-width: 390px) {
    header nav ul { display: grid; grid-template-columns: repeat(4, 1fr); gap: 4px; width: 100%; }
    header nav a.btn-x { display: flex; padding: 6px 2px; font-size: 11px; width: 100%; }
    main { padding: 15px 10px; margin: 10px 6px !important; }
}

/* 8. iPhone 12/13/14/15/Miniなどの標準幅 (375px 〜 380px) */
@media (min-width: 375px) and (max-width: 380px) {
    header nav ul { display: grid; grid-template-columns: repeat(4, 1fr); gap: 4px; width: 100%; }
    header nav a.btn-x { display: flex; padding: 6px 2px; font-size: 11px; width: 100%; }
    main { padding: 15px 10px; margin: 10px 5px !important; }
}

/* 9. 古い端末や非常にコンパクトなスマホ (374px以下) */
@media (max-width: 374px) {
    header nav ul { display: grid; grid-template-columns: repeat(3, 1fr); gap: 4px; width: 100%; }
    header nav a.btn-x { display: flex; padding: 6px 2px; font-size: 10px; width: 100%; }
    main { padding: 12px 8px; margin: 10px 4px !important; }
    .info dd { font-size: 13px; margin-left: 4px; }
    .btn { padding: 6px 10px; font-size: 11px; }
}