:root {
    --accent: #1a73e8;
    --bg: #f6f7f9;
    --card: #fff;
    --text: #1f2328;
    --muted: #6b7280;
    --line: #e5e7eb;
    --danger: #d93025;
    --ok-bg: #e6f4ea;
    --ok-text: #137333;
    --err-bg: #fce8e6;
    --err-text: #a50e0e;
}
@media (prefers-color-scheme: dark) {
    :root {
        --bg: #16181c;
        --card: #1f2227;
        --text: #e8eaed;
        --muted: #9aa0a6;
        --line: #33373d;
        --danger: #f28b82;
        --ok-bg: #1e3a2a;
        --ok-text: #81c995;
        --err-bg: #4a1f1c;
        --err-text: #f6aea9;
    }
}

* { box-sizing: border-box; }
body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", Meiryo, sans-serif;
    font-size: 16px;
    line-height: 1.5;
    -webkit-text-size-adjust: 100%;
}
a { color: var(--accent); text-decoration: none; }
h1 { font-size: 1.3rem; margin: 0 0 1rem; }
h2 { font-size: 1.1rem; margin: 0 0 1rem; }
h3 { font-size: 1rem; margin: 1.5rem 0 .75rem; }

.top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: .75rem 16px;
    background: var(--accent);
    color: #fff;
}
.top a, .top button.link { color: #fff; }
.brand { font-weight: 700; font-size: 1.1rem; }
.top nav { display: flex; align-items: center; gap: 1rem; font-size: .9rem; }
.top form { margin: 0; }
button.link { background: none; border: 0; padding: 0; font: inherit; cursor: pointer; }

main { max-width: 900px; margin: 0 auto; padding: 16px; }

.flash { padding: .75rem 1rem; border-radius: 8px; margin-bottom: 1rem; }
.flash.ok { background: var(--ok-bg); color: var(--ok-text); }
.flash.error { background: var(--err-bg); color: var(--err-text); }

.crumbs { display: flex; flex-wrap: wrap; gap: .4rem; align-items: center; margin-bottom: 1rem; font-size: .95rem; }
.crumbs span { color: var(--muted); }

.toolbar { display: flex; flex-wrap: wrap; gap: .75rem; align-items: center; }
.toolbar form { margin: 0; }
.mkdir { display: flex; gap: .5rem; flex: 1; min-width: 240px; }
.mkdir input { flex: 1; min-width: 0; }

input[type=text], input[type=password], select {
    font: inherit;
    font-size: 16px; /* iPhoneで入力時に拡大されないように */
    padding: .55rem .75rem;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--card);
    color: var(--text);
    width: 100%;
}
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: .25rem;
    font: inherit;
    padding: .55rem 1rem;
    border-radius: 8px;
    border: 1px solid var(--line);
    background: var(--card);
    color: var(--text);
    cursor: pointer;
    white-space: nowrap;
}
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; font-weight: 600; }

.hint { color: var(--muted); font-size: .85rem; margin: .5rem 0 1rem; }
.empty { color: var(--muted); text-align: center; padding: 3rem 0; }

.progress { background: var(--card); border: 1px solid var(--line); border-radius: 8px; padding: .75rem 1rem; margin-bottom: 1rem; }
.progress progress { width: 100%; height: 10px; accent-color: var(--accent); }

.list { list-style: none; margin: 0; padding: 0; background: var(--card); border: 1px solid var(--line); border-radius: 10px; }
.item {
    display: grid;
    grid-template-columns: 1fr auto auto;
    align-items: center;
    gap: .5rem;
    padding: .6rem .5rem .6rem .9rem;
    border-top: 1px solid var(--line);
}
.item:first-child { border-top: 0; }
.name { display: flex; align-items: center; gap: .6rem; min-width: 0; color: var(--text); }
.icon { flex: none; }
.label { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.meta { color: var(--muted); font-size: .8rem; white-space: nowrap; }

.menu { position: relative; }
.menu summary {
    list-style: none;
    cursor: pointer;
    padding: .2rem .7rem;
    border-radius: 6px;
    font-size: 1.2rem;
    line-height: 1;
    color: var(--muted);
}
.menu summary::-webkit-details-marker { display: none; }
.menu[open] summary { background: var(--line); }
.menu-body {
    position: absolute;
    right: 0;
    top: 100%;
    z-index: 10;
    min-width: 200px;
    display: flex;
    flex-direction: column;
    gap: .25rem;
    padding: .5rem;
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 8px;
    box-shadow: 0 6px 20px rgba(0, 0, 0, .15);
}
.menu-body > a, .menu-body > button, .menu-body form > button.danger {
    text-align: left;
    padding: .5rem .6rem;
    border-radius: 6px;
    background: none;
    border: 0;
    font: inherit;
    color: var(--text);
    cursor: pointer;
    width: 100%;
}
.menu-body > a:hover, .menu-body > button:hover { background: var(--bg); }
.danger, .menu-body .danger { color: var(--danger) !important; }
.menu-body form { margin: 0; }

.card { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 1.25rem; margin-bottom: 1rem; }
.card .list { border-radius: 8px; }
.narrow { max-width: 400px; margin: 2rem auto; }
.stack { display: flex; flex-direction: column; gap: .75rem; }
.stack label { display: flex; flex-direction: column; gap: .3rem; font-size: .9rem; }

body.dragging main { outline: 3px dashed var(--accent); outline-offset: -8px; border-radius: 12px; }

/* スマホ: 更新日時を名前の下に回す */
@media (max-width: 560px) {
    .item { grid-template-columns: 1fr auto; grid-template-rows: auto auto; row-gap: 0; }
    .item .name { grid-column: 1; grid-row: 1; }
    .item .meta { grid-column: 1; grid-row: 2; padding-left: 1.9rem; }
    .item .menu { grid-column: 2; grid-row: 1 / 3; }
    .users .item .meta { padding-left: 0; }
}