:root {
    --bg: var(--color-bg-base);
    --fg: var(--color-fg-primary);
    --muted: var(--color-fg-muted);
    --card-bg: var(--color-bg-surface);
    --border: var(--color-border-base);
    --accent: var(--color-accent);
}
* { box-sizing: border-box; }
body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Segoe UI", Roboto, sans-serif;
    background: var(--bg); color: var(--fg); line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}
.container { max-width: 760px; margin: 0 auto; padding: 1.5rem 1rem 3rem; }
.navigation-links { margin-bottom: 1rem; }
.navigation-links a { color: var(--muted); text-decoration: none; font-size: .9rem; }
.navigation-links a:hover { color: var(--accent); }
h1 { font-size: clamp(1.5rem, 5vw, 2rem); margin: 0 0 .5rem; letter-spacing: -0.02em; }
.lead { margin: 0 0 1.2rem; color: var(--muted); font-size: .95rem; }

details.help { margin: 0 0 1.2rem; }
details.help summary { cursor: pointer; color: var(--accent); font-size: .9rem; }
details.help ol { margin: .6rem 0 0; padding-left: 1.3em; font-size: .9rem; color: var(--muted); }
details.help li { margin: .3rem 0; }

.board-wrap { background: var(--card-bg); border: 1px solid var(--border); border-radius: 12px; padding: .5rem; margin-bottom: .6rem; }
#board { display: block; width: 100%; height: auto; touch-action: none; -webkit-user-select: none; user-select: none; }
.status { min-height: 1.3em; font-size: .85rem; color: var(--accent); margin-bottom: .6rem; }

.panel { background: var(--card-bg); border: 1px solid var(--border); border-radius: 12px; padding: .8rem .9rem; margin-bottom: .9rem; }
.panel-label { display: block; font-size: .75rem; font-weight: 700; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); margin-bottom: .5rem; }

button { font: inherit; cursor: pointer; border-radius: 8px; border: 1px solid var(--border); background: var(--bg); color: var(--fg); padding: .5rem .9rem; transition: background .15s, border-color .15s; }
button:hover:not(:disabled) { border-color: var(--accent); }
button:disabled { opacity: .5; cursor: default; }
button.danger { color: #d33; }
button.primary { background: var(--accent); color: #fff; border-color: var(--accent); font-weight: 600; }
button.ghost { color: var(--muted); }

/* 選択バー */
.selbar { display: flex; align-items: center; gap: .6rem; flex-wrap: wrap; }
.selbar .sel-name { font-weight: 600; }
.sel-field { display: flex; align-items: center; gap: .35rem; font-size: .82rem; color: var(--muted); }
.sel-field input[type="text"] { font: inherit; padding: .35rem .5rem; border: 1px solid var(--border); border-radius: 7px; background: var(--bg); color: var(--fg); }
.size-ctl { flex: 1 1 12em; }
.size-ctl input[type="range"] { flex: 1; min-width: 7em; accent-color: var(--accent); }

/* 軸ラベル */
.axis-row { display: flex; align-items: center; gap: .4rem; margin-bottom: .5rem; }
.axis-row.title-row { margin-bottom: .7rem; }
.axis-name { font-size: .8rem; color: var(--muted); width: 3em; flex-shrink: 0; }
.axis-row input { flex: 1; min-width: 0; font: inherit; font-size: .9rem; padding: .4rem .5rem; border: 1px solid var(--border); border-radius: 7px; background: var(--bg); color: var(--fg); }
.axis-sep { color: var(--muted); flex-shrink: 0; }
.axis-actions { margin-top: .3rem; }
.axis-actions button { font-size: .82rem; padding: .4rem .8rem; }

/* アップロードギャラリー */
.thumbs { display: grid; grid-template-columns: repeat(auto-fill, minmax(64px, 1fr)); gap: .5rem; }
.image-thumb { position: relative; display: flex; flex-direction: column; align-items: center; gap: .25rem; cursor: pointer; }
.image-thumb img { width: 100%; max-width: 56px; aspect-ratio: 1/1; object-fit: cover; border-radius: 50%; border: 2px solid var(--border); background: var(--bg); }
.image-thumb.selected img { border-color: var(--accent); box-shadow: 0 0 0 2px var(--accent); }
.image-thumb .thumb-name { font-size: .68rem; line-height: 1.2; color: var(--muted); word-break: break-word; text-align: center; }
.image-thumb .thumb-del { position: absolute; top: -6px; right: 2px; width: 18px; height: 18px; padding: 0; font-size: 11px; line-height: 1; border-radius: 50%; background: var(--card-bg); }
.gallery-empty { font-size: .85rem; color: var(--muted); margin: .2rem 0; }
.upload-label {
    display: inline-block; cursor: pointer; font-size: .82rem; font-weight: 400;
    text-transform: none; letter-spacing: 0;
    padding: .4rem .8rem; border: 1px solid var(--border); border-radius: 8px;
    background: var(--bg); color: var(--fg);
}
.upload-label:hover { border-color: var(--accent); }

/* アクション */
.actions { display: flex; gap: .6rem; flex-wrap: wrap; margin-bottom: .9rem; }
.actions button { flex: 1; min-width: 7em; }
details.tweet summary { cursor: pointer; color: var(--accent); font-size: .9rem; margin-bottom: .5rem; }
#tweetText { width: 100%; font: inherit; font-size: .9rem; padding: .5rem .6rem; border: 1px solid var(--border); border-radius: 8px; background: var(--bg); color: var(--fg); resize: vertical; }

.tool-note { font-size: .85rem; color: var(--muted); margin-top: 1rem; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }

/* レイアウト（スマホ縦積み / PC 2カラム） */
.layout { display: block; }
.col-side { display: flex; flex-direction: column; }
@media (min-width: 860px) {
    .container { max-width: 1140px; }
    .layout { display: grid; grid-template-columns: minmax(0, 1fr) minmax(340px, 400px); gap: 1.6rem; align-items: start; }
    .col-board { position: sticky; top: 1rem; }
}
@media (hover: hover) {
    .image-thumb:hover img { border-color: var(--accent); }
    #board .q-point { cursor: grab; }
}