/* ==========================================
   トップポータル専用スタイル (css/index.css)
========================================== */

/* ベーススタイル */
body {
    background-image: url('../images/背景.JPG');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-attachment: fixed;
    min-height: 100vh;
    margin: 0;
    padding-bottom: 60px;
    box-sizing: border-box;
}

/* ヘッダーエリア */
.portal-header {
    text-align: center;
    padding: 30px 15px 10px;
}

.portal-title {
    font-size: clamp(0.5rem, 4vw, 1.8rem);
    color: #1a252f;
    margin: 0 0 10px 0;
    display: inline-block;
    background: rgba(255, 255, 255, 0.85);
    padding: 8px 16px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    /* スマホで画面からはみ出さないように折り返しを許可 */
    white-space: nowrap;
    max-width: 90%;
    word-break: break-word;
}

.portal-subtitle {
    color: #333;
    font-size: clamp(0.6rem, 2.5vw, 1rem);
    margin: 8px 0 0 0;
    font-weight: bold;
    text-shadow: 0 0 10px rgba(255, 255, 255, 0.9);
}

/* メインコンテナ（台座） */
.portal-main {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap; /* スマホ時に折り返せるように変更 */
    max-width: 950px;
    margin: 15px auto;
    padding: 25px 20px;
    
    background-color: rgba(255, 255, 255, 0.5) !important;
    border-radius: 16px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
    -webkit-backdrop-filter: blur(10px) !important;
    backdrop-filter: blur(10px) !important;
    border: 1px solid rgba(255, 255, 255, 0.6);
    box-sizing: border-box;
}

.card-link {
    text-decoration: none;
    color: inherit;
    flex: 1 1 380px; /* PCでは並び、幅が狭くなると自動で縦並び化 */
    max-width: 100%;
    min-width: 0;
}

/* カード本体 */
.portal-card {
    background-color: #ffffff;
    border-radius: 12px;
    padding: 20px 15px;
    text-align: center;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
    transition: transform 0.2s, box-shadow 0.2s;
    border: 1px solid #e1e8ed;
    height: 100%;
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    align-items: center;
}

.portal-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.12);
}

.portal-card i {
    font-size: clamp(1.5rem, 5vw, 2.8rem);
    color: #0056b3;
    margin-bottom: 12px;
}

.portal-card h2 {
    font-size: clamp(0.8rem, 2.8vw, 1.15rem);
    color: #1a252f;
    margin: 0 0 10px 0;
    line-height: 1.4;
    word-break: break-word;
}

.portal-card p {
    color: #555;
    font-size: clamp(0.4rem, 2.2vw, 0.9rem);
    margin: 0 0 15px 0;
    line-height: 1.4;
}

.btn-style {
    display: inline-block;
    background-color: #0056b3;
    color: #ffffff;
    padding: 8px 18px;
    border-radius: 20px;
    font-weight: bold;
    font-size: clamp(0.75rem, 2.3vw, 0.85rem);
    white-space: nowrap;
}

/* クレジット表記 */
.photo-credit {
    position: fixed;
    bottom: 10px;
    right: 15px;
    font-size: 0.75rem;
    color: #ffffff;
    text-shadow: 1px 1px 3px rgba(0,0,0,0.8);
    background: rgba(0, 0, 0, 0.4);
    padding: 3px 8px;
    border-radius: 4px;
    pointer-events: none;
    z-index: 100;
}

/* 📱 スマホ用スタイル調整 (600px以下) */
@media (max-width: 600px) {
    .portal-header {
        padding: 20px 10px 5px;
    }

    .portal-main {
        gap: 15px;
        padding: 15px 12px;
        margin: 10px 12px;
    }

    .portal-card {
        padding: 18px 12px;
    }

    .photo-credit {
        font-size: 0.65rem;
        bottom: 5px;
        right: 5px;
    }
}