/* =========================
   元素図鑑
========================= */

:root{
    --bg-main:#0f172a;
    --bg-sub:#1e293b;

    --panel:#ffffff10;
    --panel-strong:#ffffff16;
    --border:#ffffff18;
    --border-strong:#38bdf855;

    --text-main:#f8fafc;
    --text-sub:#cbd5e1;
    --text-muted:#94a3b8;

    --accent:#38bdf8;
    --green:#22c55e;
}

*{
    box-sizing:border-box;
}

html,
body{
    margin:0;
    padding:0;
    width:100%;
    min-height:100%;
    overflow-x:hidden;
}

body{
    font-family:"Segoe UI","Noto Sans JP",sans-serif;
    background:
        radial-gradient(circle at top left,#0ea5e933,transparent 32%),
        linear-gradient(135deg,var(--bg-main),var(--bg-sub));
    color:var(--text-main);
    min-height:100vh;
    display:flex;
    flex-direction:column;
}

.book-container{
    width:min(92%,1180px);
    max-width:1180px;
    margin:26px auto 0;
    flex:1;
}

.book-panel{
    background:linear-gradient(135deg,#ffffff12,#ffffff08);
    border:1px solid var(--border);
    border-radius:26px;
    padding:26px;
    box-shadow:0 18px 50px rgba(0,0,0,.24);
}

.book-header{
    text-align:center;
    margin-bottom:22px;
}

.logo-row{
    display:inline-flex;
    align-items:center;
    justify-content:center;
    gap:12px;
    margin-bottom:8px;
}

.logo-mark{
    width:42px;
    height:42px;
    border-radius:14px;
    display:flex;
    align-items:center;
    justify-content:center;
    background:linear-gradient(135deg,#38bdf8,#22c55e);
    color:#082f49;
    font-weight:900;
    box-shadow:0 12px 30px rgba(14,165,233,.25);
}

.book-container h1{
    margin:0;
    color:#e0f2fe;
    font-size:34px;
    font-weight:850;
}

.lead{
    color:var(--text-sub);
    line-height:1.75;
    font-size:14px;
    margin:8px 0 0;
}

.stats-row{
    display:flex;
    justify-content:center;
    gap:12px;
    flex-wrap:wrap;
    margin-top:16px;
}

.stat-card{
    background:#02061770;
    border:1px solid #334155;
    border-radius:16px;
    padding:11px 16px;
    color:#e2e8f0;
    min-width:150px;
}

.stat-number{
    color:#7dd3fc;
    font-size:23px;
    font-weight:900;
}

.stat-keyword{
    display:block;
    color:#7dd3fc;
    font-weight:900;
    margin-top:4px;
}

.search-box{
    background:#02061770;
    border:1px solid #334155;
    border-radius:20px;
    padding:18px;
    margin-bottom:18px;
}

form{
    display:grid;
    grid-template-columns:1fr auto;
    gap:10px;
    align-items:center;
}

input{
    width:100%;
    padding:12px;
    border:none;
    border-radius:13px;
    font-size:15px;
    outline:none;
    background:#f8fafc;
    color:#0f172a;
}

input:focus{
    box-shadow:0 0 0 3px #38bdf855;
}

button{
    border:none;
    border-radius:13px;
    padding:12px 22px;
    background:linear-gradient(135deg,#7dd3fc,#38bdf8);
    color:#082f49;
    font-weight:850;
    cursor:pointer;
    transition:.18s ease;
    white-space:nowrap;
}

button:hover{
    transform:translateY(-2px);
    filter:brightness(1.05);
}

.quick-links{
    display:flex;
    justify-content:center;
    gap:10px;
    flex-wrap:wrap;
    margin-top:16px;
}

.quick-link{
    background:#0f172a;
    border:1px solid #334155;
    color:white;
    text-decoration:none;
    border-radius:999px;
    padding:8px 14px;
    font-size:13px;
    font-weight:750;
    transition:.18s ease;
}

.quick-link:hover{
    border-color:var(--border-strong);
    background:var(--panel-strong);
    transform:translateY(-2px);
}

.result-info{
    background:#02061770;
    border:1px solid #334155;
    border-radius:16px;
    padding:14px 18px;
    color:var(--text-sub);
    margin-bottom:16px;
    line-height:1.7;
}

.result-info strong{
    color:#7dd3fc;
}

.element-grid{
    display:grid;
    grid-template-columns:repeat(auto-fill,minmax(128px,1fr));
    gap:14px;
    margin-top:16px;
}

.element-card{
    position:relative;
    min-height:132px;
    background:#02061770;
    border:1px solid #334155;
    border-radius:18px;
    padding:12px;
    text-decoration:none;
    color:white;
    box-shadow:0 10px 24px rgba(0,0,0,.16);
    transition:.18s ease;
    overflow:hidden;
}

.element-card::before{
    content:"";
    position:absolute;
    inset:0;
    opacity:.18;
    background:linear-gradient(135deg,#38bdf8,transparent 55%);
    pointer-events:none;
}

.element-card:hover{
    transform:translateY(-4px);
    border-color:var(--border-strong);
    background:var(--panel-strong);
}

.element-card > *{
    position:relative;
}

.element-top{
    display:flex;
    justify-content:space-between;
    align-items:center;
    gap:6px;
    color:#cbd5e1;
    font-size:11px;
    font-weight:750;
}

.element-period{
    color:#bae6fd;
}

.element-symbol{
    margin-top:10px;
    font-size:36px;
    line-height:1.1;
    font-weight:900;
    color:#e0f2fe;
    text-align:center;
}

.element-name{
    margin-top:7px;
    font-size:15px;
    font-weight:850;
    text-align:center;
    color:#f8fafc;
}

.element-group{
    margin-top:8px;
    font-size:11.5px;
    color:#cbd5e1;
    text-align:center;
    line-height:1.45;
}

.empty{
    background:#02061770;
    border:1px solid #334155;
    border-radius:18px;
    padding:24px;
    text-align:center;
    color:var(--text-sub);
    line-height:1.8;
}

.back-link{
    text-align:center;
    margin-top:26px;
}

.back-link a{
    display:inline-flex;
    align-items:center;
    justify-content:center;
    background:#64748b;
    color:white;
    text-decoration:none;
    padding:12px 22px;
    border-radius:13px;
    font-weight:850;
    transition:.18s ease;
}

.back-link a:hover{
    transform:translateY(-2px);
    filter:brightness(1.05);
}

/* 分類色のアクセント */

.alkali_metal::before{
    background:linear-gradient(135deg,#ff6b6b,transparent 56%);
}

.alkaline_earth_metal::before{
    background:linear-gradient(135deg,#ffb86b,transparent 56%);
}

.transition_metal::before{
    background:linear-gradient(135deg,#f4d35e,transparent 56%);
}

.post_transition_metal::before{
    background:linear-gradient(135deg,#a6a831,transparent 56%);
}

.metalloid::before{
    background:linear-gradient(135deg,#8eff3d,transparent 56%);
}

.nonmetal::before{
    background:linear-gradient(135deg,#51cf66,transparent 56%);
}

.halogen::before{
    background:linear-gradient(135deg,#845ef7,transparent 56%);
}

.noble_gas::before{
    background:linear-gradient(135deg,#4dabf7,transparent 56%);
}

.lanthanide::before{
    background:linear-gradient(135deg,#ff9ff3,transparent 56%);
}

.actinide::before{
    background:linear-gradient(135deg,#ff6bcb,transparent 56%);
}

/* 固定ホームボタン */

.floating-home-btn{
    position:fixed;
    right:22px;
    bottom:22px;
    z-index:9999;
    display:flex;
    align-items:center;
    gap:8px;
    background:linear-gradient(135deg,#38bdf8,#22c55e);
    color:#082f49;
    text-decoration:none;
    border-radius:999px;
    padding:12px 16px;
    font-size:14px;
    font-weight:850;
    box-shadow:0 14px 30px rgba(0,0,0,.35);
    border:1px solid #ffffff55;
    transition:.18s ease;
}

.floating-home-btn:hover{
    transform:translateY(-3px);
    filter:brightness(1.05);
}

.floating-home-btn:active{
    transform:translateY(-1px);
}

.floating-home-btn svg{
    width:20px;
    height:20px;
    flex-shrink:0;
}

@media(max-width:700px){

    .book-container{
        width:94%;
        margin-top:18px;
    }

    .book-panel{
        padding:20px 14px;
        border-radius:22px;
    }

    .logo-mark{
        width:38px;
        height:38px;
        border-radius:13px;
    }

    .book-container h1{
        font-size:28px;
    }

    .lead{
        font-size:13px;
    }

    .stats-row{
        display:grid;
        grid-template-columns:repeat(2,1fr);
        gap:10px;
    }

    .stat-card{
        min-width:0;
        padding:10px 8px;
        font-size:12px;
        text-align:center;
    }

    .stat-number{
        display:block;
        font-size:22px;
    }

    .search-box{
        padding:14px;
        border-radius:18px;
    }

    form{
        grid-template-columns:1fr;
    }

    .quick-links{
        display:grid;
        grid-template-columns:repeat(2,1fr);
        gap:8px;
    }

    .quick-link{
        text-align:center;
        padding:8px 6px;
        font-size:12px;
    }

    .element-grid{
        grid-template-columns:repeat(2,minmax(0,1fr));
        gap:10px;
    }

    .element-card{
        min-height:122px;
        padding:10px 8px;
        border-radius:16px;
    }

    .element-symbol{
        font-size:31px;
    }

    .element-name{
        font-size:14px;
    }

    .element-group{
        font-size:10.5px;
    }

    .floating-home-btn{
        right:16px;
        bottom:16px;
        width:52px;
        height:52px;
        padding:0;
        justify-content:center;
        border-radius:50%;
    }

    .floating-home-btn span{
        display:none;
    }

    .floating-home-btn svg{
        width:23px;
        height:23px;
    }

}

@media(max-width:360px){

    .stats-row,
    .quick-links{
        grid-template-columns:1fr;
    }

}

.cs-footer{
    margin-top:0;
    width:100%;
    max-width:100%;
    flex-shrink:0;
}