:root {
    --bd: #e5e7eb;
    --fg: #111827;
    --muted: #6b7280;
    --blue: #2563eb;
    --bg: #fffffa;
    --err: #b91c1c;
}

* {

    /* 日付ごとのカードの中身をグリッドで並べる */
    #dates .row {
        display: grid;
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
        gap: 8px;
        justify-content: start;
        box-sizing: border-box;
    }

    /* 時限スロット */
    #dates .slot {
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding: 6px 10px;
        border: 1px solid var(--bd);
        border-radius: 10px;
        box-sizing: border-box;
        background: var(--bg);
        cursor: pointer;
        user-select: none;
    }

    #dates .slot>div {
        display: flex;
        flex-direction: column;
        gap: 2px;
    }

    #dates .slot .muted {
        font-size: 12px;
    }

    #dates .slot.sel {
        outline: 2px solid var(--blue);
        background: #eff6ff;
    }

    @media (min-width: 1024px) {
        #dates.grid {
            display: grid;
            grid-template-columns: repeat(5, minmax(0, 1fr));
            gap: 12px;
            align-items: start;
        }
    }

    .header-5 {
        display: grid;
        grid-template-columns: repeat(5, 1fr);
        gap: 8px;
        margin: 4px 0 8px;
    }

    .dow {
        font-size: 12px;
        color: var(--muted);
        text-align: center;
    }

    .date-head {
        margin-bottom: 6px;
    }

    box-sizing: border-box;
}

body {
    font-family: "Noto Sans JP", system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Noto Sans JP", sans-serif;
    line-height: 1.6;
    color: var(--fg);
    background: var(--bg);
    margin: 24px;
    font-size: 85%;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
}

h1 {
    margin: 0 0 12px;
    font-size: 1.6rem;
}

h2 {
    color: var(--fg);
    margin: 25px 0 0 0;
    font-size: 1.0rem;
}

.description {
    color: var(--fg);
    margin: 0 0 3px 0;
    font-size: 0.8rem;
}

ul {
    margin: 0 0 0 0;
    padding-left: 15px;
}

li {
    margin: 0 0 0 0;
}

a {
    text-decoration: none;
    color: var(--blue);
}

.muted {
    color: var(--muted);
}

.card {
    border: 1px solid var(--bd);
    border-radius: 12px;
    padding: 16px;
    margin: 12px 0;
    background: var(--bg);
    ;
}

.label {
    display: block;
    font-weight: 600;
    margin-bottom: 6px;
}

input,
textarea,
button {
    font: inherit;
    background: var(--bg);
    border: 1px solid #aaaaaa;
    border-radius: 5px;
    padding: 10px;
}

input[type="text"],
input[type="email"],
textarea {
    width: 100%;
}

input[type="email"] {
    max-width: 400px;
}

input.invalid,
textarea.invalid {
    border-color: var(--err);
}

.error {
    color: var(--err);
    margin-top: 6px;
}

.btn {
    background: var(--blue);
    color: var(--bg);
    border: none;
    border-radius: 10px;
    padding: 10px 16px;
    cursor: pointer;
}

.btn[type="submit"] {
    margin-top: 10px;
}

.btn.ghost {
    background: #f3f4f6;
    color: #111;
}

.btn:disabled {
    opacity: .6;
    cursor: default
}

.actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.fieldset {
    margin: 15px 0 0 0;
    border: 1px solid #aaaaaa;
    border-radius: 5px;
    width: fit-content;
    max-width: 100%;
}

.check {
    display: inline-flex;
    gap: 8px;
    align-items: center;
    margin-right: 16px;
}

.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr 2fr;
    gap: 12px;
    align-items: start;
}

.field {
    min-width: 0;
}

.w-1-3 {
    width: 100%;
    max-width: 360px;
}

@media (max-width: 900px) {
    .form-grid {
        grid-template-columns: 1fr;
    }

    .w-1-3 {
        max-width: none;
    }
}

.grid {
    display: grid;
    gap: 12px;
}

@media (min-width: 720px) {
    .grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.row {
    display: grid;
    gap: 8px;
}

.date-head {
    font-weight: 700;
    margin-bottom: 6px;
}

.slot {
    display: flex;
    align-items: center;
    justify-content: space-between;
    border: 1px solid var(--bd);
    border-radius: 10px;
    padding: 8px 10px;
    cursor: pointer;
    user-select: none;
}

.slot.sel {
    outline: 2px solid var(--blue);
    background: #eff6ff;
}

.badge {
    font-size: 12px;
    color: #fff;
    background: var(--blue);
    border-radius: 999px;
    padding: 2px 8px;
}

.toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 8px;
    margin: 8px 0 16px;
}

.selected-list {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-top: 8px;
}

.pill {
    display: inline-flex;
    gap: 6px;
    align-items: center;
    border: 1px solid var(--bd);
    border-radius: 999px;
    padding: 6px 10px;
}

.pill a {
    text-decoration: none;
    color: #111;
}

/* 無効スロット：押せないが見せる */
.slot.disabled {
    opacity: 1;
    cursor: not-allowed;
    background: #f9fafb;
    /* 薄いグレー背景 */
    border: 1px solid #d1d5db;
    /* 薄めの枠線 */
    color: #dddddd;
    /* テキストもグレーに */
}

.slot.disabled:hover {
    background: #f3f4f6;
    /* ホバー時もほんの少し変化 */
    outline: none;
}

.slot.disabled .muted {
    color: #9ca3af;
    /* 補足テキストも同じグレー */
}

/* 選択時のチェックマークを非表示にする（スロット内の x-show 要素だけ隠す） */
.slot>.muted[x-show] {
    display: none !important;
}

.label.req::after {
    content: " *";
    color: var(--err);
    font-weight: 600;
}

h2.req::after {
    content: " *";
    color: var(--err);
    /* margin-left: 0.25em; */
    font-weight: 600;
}

.form-error {
    color: var(--err);
    font-weight: 600;
    margin: 10px 0 5px;
}