/* ===================================
   :root 変数 (サイト全体の色やフォントを管理)
   =================================== */
:root {
    --bg-color: #f5f3ed; /* 落ち着いたクリーム系の背景 */
    --surface-color: #ffffff; /* コンテンツエリアは清潔感のある白 */
    --text-color: #4b4b4b; /* 柔らかいチャコールグレー */
    --text-muted-color: #757575; /* 標準的なグレー */
    --border-color: #e0e0e0; /* 優しい印象の境界線 */
    --midori-green: #00754a; /* 深みと信頼感のある緑 */
    --focus-color: #008f5c; /* フォーカス用の少し明るい緑 */
    --jr-hokkaido: #2cb431;
    --jr-east: #008803;
    --jr-tokai: #ee6d00;
    --jr-west: #0065b1;
    --jr-shikoku: #309ac3;
    --jr-kyushu: #ee1d23;
}

/* ===================================
   基本スタイル
   =================================== */
body {
    margin: 0;
    font-family: "Noto Sans JP", "Arial", sans-serif;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background-color: var(--bg-color);
    color: var(--text-color);
    box-sizing: border-box;
    line-height: 1.7;
}

body.is-menu-open {
    overflow: hidden;
}

/* ===================================
   アクセシビリティ (フォーカス表示)
   =================================== */
a:focus-visible,
button:focus-visible,
input:focus-visible {
    outline: 3px solid var(--focus-color);
    outline-offset: 3px;
    border-radius: 6px;
    transition: outline-offset 0.1s ease;
}

/* ===================================
   ヘッダー (モバイルファースト)
   =================================== */
.main-header {
    width: 100%;
    padding: 10px 20px;
    box-sizing: border-box;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    left: 0;
    z-index: 1002;
    background-color: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
}

.hamburger-button {
    display: block;
    position: relative;
    width: 30px;
    height: 24px;
    z-index: 1003;
    border: none;
    background: transparent;
    padding: 0;
    cursor: pointer;
    order: -1;
}
.hamburger-icon,
.hamburger-icon::before,
.hamburger-icon::after {
    content: "";
    display: block;
    background-color: var(--text-color);
    height: 3px;
    width: 100%;
    border-radius: 3px;
    transition: all 0.3s ease-in-out;
    position: absolute;
}
.hamburger-icon {
    top: 50%;
    transform: translateY(-50%);
}
.hamburger-icon::before {
    top: -9px;
}
.hamburger-icon::after {
    top: 9px;
}
.hamburger-button.is-active .hamburger-icon {
    background: transparent;
}
.hamburger-button.is-active .hamburger-icon::before {
    top: 0;
    transform: rotate(45deg);
}
.hamburger-button.is-active .hamburger-icon::after {
    top: 0;
    transform: rotate(-45deg);
}

#sidenav {
    position: fixed;
    top: 0;
    left: 0;
    width: min(80vw, 300px);
    height: 100%;
    padding-top: 60px;
    transform: translateX(-100%);
    transition: transform 0.3s ease-in-out;
    z-index: 1001;
}
#sidenav.is-active {
    transform: translateX(0);
}
#sidenav ul {
    list-style: none;
    margin: 0;
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    width: 100%;
    box-sizing: border-box;
}
#sidenav ul li {
    margin: 8px 0;
    width: 100%;
}
#sidenav ul li a {
    display: block;
    padding: 15px;
    width: 100%;
    box-sizing: border-box;
    color: var(--text-color);
    text-decoration: none;
    border-radius: 6px;
    font-weight: 500;
    font-size: 0.9rem;
}
#sidenav ul li a:hover {
    background-color: rgba(0, 0, 0, 0.05);
}

#overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(245, 243, 237, 0.6); /* 背景色と調和させつつ暗く */
    backdrop-filter: blur(6px); /* ぼかし効果を追加 */
    -webkit-backdrop-filter: blur(6px); /* Safari向け */
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition:
        opacity 0.3s ease,
        visibility 0s 0.3s linear;
}
#overlay.is-active {
    opacity: 1;
    visibility: visible;
    transition-delay: 0s;
}

/* ===================================
   レイアウト & メインコンテンツ
   =================================== */
.content-wrapper {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 100%;
    padding: 30px 15px;
    box-sizing: border-box;
    text-align: center;
}
.container {
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    padding: 30px 20px;
    border-radius: 16px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
    max-width: 750px;
    width: 100%;
    box-sizing: border-box;
}
h1 {
    font-size: 2rem;
    margin-top: 0;
    margin-bottom: 15px;
    font-weight: 700;
    letter-spacing: 1px;
    color: var(--midori-green);
}
h2 {
    font-size: 1.3rem;
    margin-top: 30px;
    margin-bottom: 10px;
    font-weight: 500;
    color: var(--midori-green);
}
.container p {
    margin-bottom: 25px;
    color: var(--text-muted-color);
    font-size: 1rem;
}
.notice-container {
    background-color: rgba(0, 117, 74, 0.07);
    color: var(--midori-green);
    border: 1px solid rgba(0, 117, 74, 0.3);
    border-radius: 8px;
    padding: 15px 20px;
    margin: 20px auto;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    text-align: left;
}
.notice-icon {
    font-size: 1.5em;
    line-height: 1;
}
.notice-container p {
    margin: 0;
    color: inherit;
}
.notice-container strong {
    color: #005a3a;
}
.company-buttons {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    width: 100%;
}
.company-button {
    display: inline-block;
    width: 100%;
    min-width: auto;
    padding: 18px 20px;
    font-size: 1.1rem;
    box-sizing: border-box;
    color: #fff;
    text-decoration: none;
    font-weight: bold;
    text-align: center;
    border: none;
    border-radius: 12px;
    transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.15);
}
.company-button:hover {
    transform: translateY(-3px) scale(1.03);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.2);
}
.company-button.jr-hokkaido {
    background-color: var(--jr-hokkaido);
}
.company-button.jr-east {
    background-color: var(--jr-east);
}
.company-button.jr-tokai {
    background-color: var(--jr-tokai);
}
.company-button.jr-west {
    background-color: var(--jr-west);
}
.company-button.jr-shikoku {
    background-color: var(--jr-shikoku);
}
.company-button.jr-kyushu {
    background-color: var(--jr-kyushu);
}
.company-button.private-other {
    background-color: #9e9e9e;
}
.company-button.is-disabled {
    background-color: #dcdcdc;
    color: #a0a0a0;
    cursor: not-allowed;
    opacity: 0.9;
    pointer-events: none;
    box-shadow: none;
}
.company-button.is-disabled:hover {
    transform: none;
    box-shadow: none;
}

/* ===================================
   フッター
   =================================== */
footer {
    width: 100%;
    background-color: #eae8e1;
    padding: 25px 0;
    text-align: center;
    border-top: 1px solid var(--border-color);
    margin-top: 40px;
}
footer nav ul {
    list-style: none;
    padding: 0;
    margin: 0 0 15px 0;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
}
footer nav ul li {
    margin: 5px 15px;
}
footer nav ul li a {
    color: var(--text-muted-color);
    text-decoration: none;
    font-size: 1em;
    padding: 10px 15px;
    border-radius: 6px;
    transition: all 0.3s ease;
}
footer nav ul li a:hover {
    background-color: rgba(0, 0, 0, 0.05);
    color: var(--text-color);
}
footer p {
    color: #888;
    font-size: 0.9em;
    margin: 0;
}

/* ===================================
   アニメーション
   =================================== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}
h1,
.notice-container,
.container h2,
.container p:not(.notice-container p),
.company-buttons {
    opacity: 0;
}
h1 {
    animation: fadeIn 0.8s ease-out forwards;
}
.notice-container {
    animation: fadeIn 0.8s ease-out 0.2s forwards;
}
.container h2 {
    animation: fadeIn 0.8s ease-out 0.4s forwards;
}
.container p:not(.notice-container p) {
    animation: fadeIn 0.8s ease-out 0.6s forwards;
}
.company-buttons {
    animation: fadeIn 0.8s ease-out 0.8s forwards;
}

/* ==============================================================
   ▼▼▼ PC向けスタイル (画面幅 993px 以上) ▼▼▼
   ============================================================== */
@media (min-width: 993px) {
    /* --- ヘッダー --- */
    .main-header {
        justify-content: flex-end;
        padding: 0 20px;
    }
    .hamburger-button {
        display: none;
    }
    #sidenav {
        position: static;
        transform: none;
        width: auto;
        height: auto;
        background-color: transparent;
        padding-top: 0;
        box-shadow: none;
        border: none;
    }
    #sidenav ul {
        flex-direction: row;
    }
    #sidenav ul li {
        margin: 0 0 0 20px;
        width: auto;
    }
    #sidenav ul li a {
        display: inline-block;
        padding: 10px 15px;
        width: auto;
    }

    /* --- レイアウト & コンテンツ --- */
    .content-wrapper {
        padding: 40px 20px 40px 20px;
    }
    .container {
        padding: 40px 50px;
    }
    h1 {
        font-size: 2.5em;
    }
    h2 {
        font-size: 1.5rem;
    }
    .company-buttons {
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: center;
    }
    .company-button {
        width: auto;
        min-width: 160px;
    }
}