:root {
    --bg: #0f0f0f;
    --panel: #222;
    --line: #2f3338;
    --ink: #d9d9d9;
    --ink-soft: #9ea6b2;
    --accent: #1987e0;
    --accent-2: #0f6fbe;
}

* {
    -webkit-user-select: none;
    /* Safari, Chrome */
    -moz-user-select: none;
    /* Firefox */
    -ms-user-select: none;
    /* IE 10+ */
    user-select: none;
    /* Standard syntax */
    /* サイト規定のリセット */
    margin: 0;
    padding: 0;
    margin-block-end: 0;
    margin-block-start: 0;
    margin-inline-start: 0;
    margin-inline-end: 0;
    border: 0;
    font-size: unset;
    font-weight: unset;
    line-height: unset;
    list-style: none;
    box-sizing: border-box;
    padding-block-start: 0;
    padding-block-end: 0;
    padding-inline-start: 0;
    padding-inline-end: 0;
}

img {
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: "Segoe UI", "BIZ UDPGothic", "Yu Gothic", sans-serif;
    background: var(--bg);
    color: var(--ink);
}

.panel {
    border: 1px solid var(--line);
    background: var(--panel);
}

.head,
.panel-head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px;
    border-bottom: 1px solid #1d1f22;
    background: linear-gradient(#36393f, #2f3237);
}

h1 {
    margin: 0;
    font-size: 1.05rem;
    color: #f2f5f9;
}

.back {
    color: #8fc1ff;
    text-decoration: none;
    font-size: 0.9rem;
}

.meta {
    padding: 8px 12px;
    font-size: 0.88rem;
    color: var(--ink-soft);
}

.note {
    margin: 0;
    color: var(--ink-soft);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 8px 14px;
    border-radius: 3px;
    text-decoration: none;
    font-weight: 700;
}

.btn.primary {
    background: linear-gradient(180deg, var(--accent), var(--accent-2));
    color: #fff;
}

.btn.ghost {
    border: 1px solid #3f4650;
    background: #2b313a;
    color: #d2d9e3;
}

@media (max-width: 1024px) {

    .head,
    .panel-head {
        padding: 10px;
        gap: 8px;
        flex-wrap: wrap;
    }
}

@media (max-width: 768px) {
    .panel {
        border-left: 0;
        border-right: 0;
    }

    .head,
    .panel-head {
        align-items: flex-start;
    }

    h1 {
        font-size: 0.98rem;
    }
}