:root {
    --bg: #f5f6f8;
    --surface: #ffffff;
    --text: #1c2230;
    --muted: #667085;
    --border: #e2e5eb;
    --primary: #2f6df6;
    --primary-text: #ffffff;
    --danger: #d92d20;
    --ok: #12805c;
    --warn: #b54708;
    --shadow: 0 8px 28px rgba(16, 24, 40, .14);
    --radius: 10px;
    color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
    :root {
        --bg: #101218;
        --surface: #191c24;
        --text: #e7e9ef;
        --muted: #98a2b3;
        --border: #2a2f3a;
        --primary: #5b8cff;
        --primary-text: #0b1020;
        --danger: #f97066;
        --ok: #4ade9c;
        --warn: #fdb022;
        --shadow: 0 8px 28px rgba(0, 0, 0, .55);
    }
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { margin: 0; }
body {
    background: var(--bg);
    color: var(--text);
    font: 15px/1.5 system-ui, -apple-system, "Segoe UI", "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
}
body.noscroll { overflow: hidden; }
h1, h2 { margin: 0; line-height: 1.25; }
h2 { font-size: 1.15rem; }
a { color: var(--primary); }
code { background: color-mix(in srgb, var(--muted) 18%, transparent); padding: 1px 6px; border-radius: 5px; font-size: .92em; }
.muted { color: var(--muted); }
.small { font-size: .85rem; }

/* ---------- 表單與按鈕 ---------- */
input, select, textarea, button { font: inherit; color: inherit; }
input[type=text], input[type=password], input[type=search], select, textarea {
    width: 100%;
    padding: 8px 10px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    outline: none;
}
input:focus, select:focus, textarea:focus, button:focus-visible, .cell:focus-visible {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary) 28%, transparent);
}
button, .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 8px 14px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--surface);
    cursor: pointer;
    text-decoration: none;
    white-space: nowrap;
}
button:hover:not(:disabled) { border-color: var(--muted); }
button:disabled { opacity: .45; cursor: default; }
button.primary, .btn.primary { background: var(--primary); border-color: var(--primary); color: var(--primary-text); font-weight: 600; }
button.primary:hover:not(:disabled) { filter: brightness(1.07); }
button.ghost { background: transparent; }
button.danger { color: var(--danger); }
button.mini { padding: 3px 10px; font-size: .85rem; }
.wide { width: 100%; }
.inline { display: inline; margin: 0; }

/* ---------- 頂欄 ---------- */
.top {
    position: sticky;
    top: 0;
    z-index: 20;
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 16px;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
}
.brand { font-size: 1.2rem; margin-right: 8px; }
.top #search { flex: 1 1 200px; max-width: 360px; margin-left: auto; }
.fmt { display: flex; align-items: center; gap: 6px; color: var(--muted); font-size: .85rem; white-space: nowrap; }
.fmt select { width: auto; padding: 6px 8px; color: var(--text); }

/* ---------- 版面 ---------- */
.layout { display: grid; grid-template-columns: 230px 1fr; min-height: calc(100vh - 57px); }
.side {
    position: sticky;
    top: 57px;
    align-self: start;
    max-height: calc(100vh - 57px);
    overflow: auto;
    padding: 14px;
    border-right: 1px solid var(--border);
}
#albumNav { display: flex; flex-direction: column; gap: 2px; margin-bottom: 12px; }
.nav-item {
    justify-content: space-between;
    width: 100%;
    border-color: transparent;
    background: transparent;
    text-align: left;
}
.nav-item:hover:not(:disabled) { background: color-mix(in srgb, var(--muted) 12%, transparent); border-color: transparent; }
.nav-item.active { background: color-mix(in srgb, var(--primary) 14%, transparent); color: var(--primary); font-weight: 600; }
.nav-name { overflow: hidden; text-overflow: ellipsis; }
.nav-count { color: var(--muted); font-size: .85rem; font-weight: 400; }
.nav-sep { margin: 12px 12px 4px; font-size: .8rem; color: var(--muted); }

.main { padding: 16px 20px 60px; min-width: 0; }
.toolbar { display: flex; align-items: flex-end; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-bottom: 14px; }
.toolbar > div:first-child { display: flex; align-items: baseline; gap: 10px; }

.bulk {
    position: sticky;
    top: 66px;
    z-index: 10;
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 14px;
    padding: 8px 12px;
    background: var(--surface);
    border: 1px solid var(--primary);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}
.bulk select { width: auto; }

/* ---------- 縮圖格 ---------- */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 12px; }
.cell {
    position: relative;
    aspect-ratio: 1;
    overflow: hidden;
    cursor: pointer;
    background: color-mix(in srgb, var(--muted) 14%, var(--surface));
    border: 2px solid transparent;
    border-radius: var(--radius);
}
.cell img { width: 100%; height: 100%; object-fit: cover; display: block; transition: transform .2s; }
.cell:hover img { transform: scale(1.04); }
.cell.selected { border-color: var(--primary); }
.cell .cap {
    position: absolute;
    left: 0; right: 0; bottom: 0;
    padding: 18px 8px 6px;
    color: #fff;
    font-size: .8rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    background: linear-gradient(transparent, rgba(0, 0, 0, .65));
    opacity: 0;
    transition: opacity .15s;
}
.cell:hover .cap, .cell:focus-visible .cap { opacity: 1; }
.chk {
    position: absolute;
    top: 6px; left: 6px;
    display: grid;
    place-items: center;
    width: 26px; height: 26px;
    background: rgba(0, 0, 0, .35);
    border-radius: 7px;
    opacity: 0;
    transition: opacity .15s;
}
.chk input { width: 16px; height: 16px; margin: 0; cursor: pointer; accent-color: var(--primary); }
.cell:hover .chk, .cell.selected .chk, .grid.selecting .chk { opacity: 1; }
@media (hover: none) { .chk { opacity: 1; } .cell .cap { opacity: 1; } }

.empty { text-align: center; padding: 70px 16px; }
.more { text-align: center; margin-top: 18px; }

/* ---------- 上傳面板 / 拖曳 / Toast ---------- */
.drop {
    position: fixed; inset: 0; z-index: 60;
    display: grid; place-items: center;
    background: color-mix(in srgb, var(--primary) 22%, rgba(0, 0, 0, .5));
    border: 3px dashed var(--primary);
    color: #fff; font-size: 1.5rem; font-weight: 700;
    pointer-events: none;
}
.uploads {
    position: fixed; right: 16px; bottom: 16px; z-index: 40;
    width: min(340px, calc(100vw - 32px));
    max-height: 50vh;
    display: flex; flex-direction: column;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}
.u-head { display: flex; align-items: center; justify-content: space-between; padding: 8px 12px; border-bottom: 1px solid var(--border); }
.u-list { overflow: auto; padding: 4px 12px 10px; }
.u-row { display: grid; grid-template-columns: 1fr auto; gap: 2px 8px; align-items: center; padding: 7px 0; border-bottom: 1px solid var(--border); font-size: .88rem; }
.u-row:last-child { border-bottom: 0; }
.u-name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.u-bar { grid-column: 1 / -1; height: 4px; background: var(--border); border-radius: 3px; overflow: hidden; }
.u-bar i { display: block; width: 0; height: 100%; background: var(--primary); transition: width .15s; }
.u-status { color: var(--muted); font-size: .8rem; }
.u-row.ok .u-bar i { background: var(--ok); }
.u-row.err .u-bar i { background: var(--danger); width: 100% !important; }
.u-row.err .u-status { color: var(--danger); }
.toast {
    position: fixed; left: 50%; bottom: 24px; z-index: 80;
    transform: translate(-50%, 20px);
    max-width: calc(100vw - 32px);
    padding: 9px 16px;
    background: #1c2230; color: #fff;
    border-radius: 999px;
    box-shadow: var(--shadow);
    opacity: 0; pointer-events: none;
    transition: opacity .2s, transform .2s;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }
.toast.err { background: var(--danger); color: #fff; }

/* ---------- 燈箱 ---------- */
.lb {
    position: fixed; inset: 0; z-index: 50;
    display: grid;
    grid-template-columns: 1fr 340px;
    background: rgba(8, 10, 16, .9);
}
.lb-stage { position: relative; display: flex; align-items: center; justify-content: center; min-width: 0; min-height: 0; padding: 20px 60px; }
.lb-stage img { max-width: 100%; max-height: 100%; object-fit: contain; border-radius: 4px; }
.lb-close, .lb-nav {
    position: absolute;
    width: 42px; height: 42px; padding: 0;
    border: 0; border-radius: 50%;
    background: rgba(255, 255, 255, .14);
    color: #fff; font-size: 1.5rem; line-height: 1;
}
.lb-close:hover:not(:disabled), .lb-nav:hover:not(:disabled) { background: rgba(255, 255, 255, .28); }
.lb-close { top: 14px; left: 14px; font-size: 1.1rem; }
.lb-nav { top: 50%; transform: translateY(-50%); }
.lb-prev { left: 8px; }
.lb-next { right: 8px; }
.lb-panel {
    display: flex; flex-direction: column; gap: 14px;
    padding: 18px;
    overflow: auto;
    background: var(--surface);
    border-left: 1px solid var(--border);
}
.lb-panel label { display: flex; flex-direction: column; gap: 5px; font-size: .85rem; color: var(--muted); }
.row { display: flex; gap: 6px; }
.links { display: flex; flex-direction: column; gap: 10px; }
.link-row .l-label { display: block; margin-bottom: 4px; font-size: .85rem; color: var(--muted); }
.link-row .row input { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: .8rem; }

/* ---------- 登入 / 安裝頁 ---------- */
.center-page { display: grid; place-items: center; min-height: 100vh; padding: 24px 16px; }
.card { width: min(400px, 100%); padding: 28px; background: var(--surface); border: 1px solid var(--border); border-radius: 14px; box-shadow: var(--shadow); }
.card.install { width: min(620px, 100%); }
.card h1 { margin-bottom: 4px; }
.card h2 { margin: 20px 0 8px; font-size: 1rem; }
.card form { display: flex; flex-direction: column; gap: 12px; }
.card label { display: flex; flex-direction: column; gap: 5px; font-size: .88rem; color: var(--muted); }
.card label small { color: var(--muted); font-size: .8rem; }
.card .primary { margin-top: 6px; padding: 10px 14px; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.alert { margin: 12px 0; padding: 9px 12px; color: var(--danger); background: color-mix(in srgb, var(--danger) 10%, transparent); border: 1px solid color-mix(in srgb, var(--danger) 35%, transparent); border-radius: 8px; font-size: .9rem; }
.checks { margin: 16px 0; padding: 0; list-style: none; display: flex; flex-direction: column; gap: 6px; font-size: .9rem; }
.checks li { display: flex; gap: 10px; }
.checks li > span { width: 18px; font-weight: 700; }
.checks .ok > span { color: var(--ok); }
.checks .bad > span { color: var(--danger); }
.checks .warn > span { color: var(--warn); }
.checks small { display: block; color: var(--muted); }
textarea.code { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: .8rem; }

/* ---------- 手機 ---------- */
@media (max-width: 860px) {
    .layout { grid-template-columns: 1fr; }
    .side { position: static; max-height: none; padding: 10px 12px; border-right: 0; border-bottom: 1px solid var(--border); display: flex; gap: 8px; align-items: center; }
    #albumNav { flex-direction: row; overflow-x: auto; margin: 0; flex: 1; }
    .nav-item { width: auto; flex: 0 0 auto; gap: 8px; }
    .nav-sep { display: none; }
    #newAlbum { width: auto; flex: 0 0 auto; }
    .top { flex-wrap: wrap; }
    .top #search { order: 10; flex: 1 0 100%; max-width: none; margin-left: 0; }
    .brand { margin-right: auto; }
    .main { padding: 12px 12px 80px; }
    .grid { grid-template-columns: repeat(auto-fill, minmax(112px, 1fr)); gap: 8px; }
    .bulk { top: 108px; }
    .lb { grid-template-columns: 1fr; grid-template-rows: minmax(0, 1fr) auto; }
    .lb-stage { padding: 56px 8px 8px; }
    .lb-panel { max-height: 46vh; border-left: 0; border-top: 1px solid var(--border); }
    .lb-nav { top: auto; bottom: 12px; transform: none; }
    .grid2 { grid-template-columns: 1fr; }
}

/* ---------- 公開上傳設定視窗 ---------- */
input[type=number] {
    width: 100%; padding: 8px 10px; background: var(--surface);
    border: 1px solid var(--border); border-radius: 8px; outline: none;
}
input[type=number]:focus { border-color: var(--primary); box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary) 28%, transparent); }
.modal {
    position: fixed; inset: 0; z-index: 70; overflow: auto;
    display: grid; place-items: start center; padding: 6vh 16px;
    background: rgba(0, 0, 0, .5);
}
.modal-box {
    width: min(560px, 100%); padding: 22px;
    background: var(--surface); border: 1px solid var(--border);
    border-radius: 14px; box-shadow: var(--shadow);
}
.modal-box h3 { margin: 18px 0 8px; font-size: .95rem; }
.modal-box p { margin: 6px 0 0; }
.set-link { display: flex; flex-direction: column; gap: 5px; margin: 14px 0; }
.set-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 10px; }
.set-grid label { display: flex; flex-direction: column; gap: 5px; font-size: .85rem; color: var(--muted); }
.check { display: flex; align-items: center; gap: 8px; margin-top: 12px; cursor: pointer; }
.check input { width: auto; }
.modal-actions { display: flex; align-items: center; gap: 8px; margin-top: 22px; }
.modal-actions .spacer { flex: 1; }

.site-footer {
    text-align: center;
    font-size: 12px;
    color: var(--muted, #888);
    padding: 16px 12px 24px;
    line-height: 1.5;
}