/* styles.css */
*{margin:0;padding:0;box-sizing:border-box;-webkit-tap-highlight-color:transparent}
:root{
  --bg:#0d0d0d;--bg2:#141414;--bg3:#1c1c1c;--fg:#eee;--fg2:#aaa;--ac:#4da3ff;--ac2:#2563eb;
  --bd:#2a2a2a;--err:#ef4444;--ok:#22c55e;--warn:#fbbf24
}
body{font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--fg);height:100vh;display:flex;flex-direction:column;overflow:hidden;touch-action:none}
header{position:sticky;top:0;z-index:100;background:rgba(20,20,20,.95);backdrop-filter:blur(8px);border-bottom:1px solid var(--bd);padding:10px 12px;display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.logo{font-weight:700;font-size:1.1rem;color:var(--ac);display:flex;align-items:center;gap:6px}
.logo svg{width:22px;height:22px}
.spacer{flex:1}
.btn{padding:8px 14px;border:none;background:var(--bg3);color:var(--fg);border-radius:8px;font-size:.8rem;font-weight:600;cursor:pointer;transition:.2s;display:flex;align-items:center;gap:6px;white-space:nowrap;touch-action:manipulation}
.btn:hover{background:var(--ac);color:#000}
.btn:active{transform:scale(.97)}
.btn svg{width:18px;height:18px}
.btn.primary{background:var(--ac);color:#000}
.btn.danger{background:var(--err);color:#fff}
.btn.danger:hover{background:#dc2626}
.btn:disabled{opacity:.4;pointer-events:none}
.drop-zone{position:fixed;inset:0;background:rgba(77,163,255,.15);border:2px dashed var(--ac);border-radius:12px;display:none;align-items:center;justify-content:center;flex-direction:column;gap:12px;z-index:200;pointer-events:none;font-size:1.2rem;color:var(--ac)}
.drop-zone.active{display:flex;animation:fadeIn .15s}
@keyframes fadeIn{from{opacity:0}to{opacity:1}}
#canvas{flex:1;display:block;touch-action:none;background:var(--bg)}
.panel{position:fixed;bottom:0;left:0;right:0;background:rgba(20,20,20,.98);backdrop-filter:blur(10px);border-top:1px solid var(--bd);border-radius:16px 16px 0 0;padding:12px 12px max(12px,env(safe-area-inset-bottom));z-index:50;transform:translateY(100%);transition:transform .3s cubic-bezier(.25,.8,.25,1);max-height:70vh;overflow:auto}
.panel.open{transform:translateY(0)}
.panel-handle{height:5px;width:40px;background:var(--bd);border-radius:3px;margin:0 auto 10px}
.panel-tabs{display:flex;gap:6px;overflow-x:auto;padding-bottom:8px;scrollbar-width:none}
.panel-tabs::-webkit-scrollbar{display:none}
.tab{padding:8px 14px;background:var(--bg3);border:none;border-radius:20px;color:var(--fg2);font-size:.75rem;font-weight:600;cursor:pointer;white-space:nowrap;transition:.2s;touch-action:manipulation}
.tab.active{background:var(--ac);color:#000}
.tab-panel{display:none}
.tab-panel.active{display:block;animation:fadeIn .2s}
.section{margin-bottom:16px}
.section-title{font-size:.7rem;font-weight:700;color:var(--fg2);text-transform:uppercase;letter-spacing:.5px;margin-bottom:10px;padding:0 4px}
.row{display:flex;align-items:center;gap:10px;margin-bottom:10px;flex-wrap:wrap}
.row>label{min-width:90px;font-size:.8rem;color:var(--fg2);white-space:nowrap}
input[type=range]{flex:1;height:28px;-webkit-appearance:none;background:transparent;cursor:pointer;touch-action:manipulation}
input[type=range]::-webkit-slider-runnable-track{height:4px;background:var(--bd);border-radius:2px}
input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:18px;height:18px;background:var(--ac);border-radius:50%;margin-top:-7px;box-shadow:0 0 0 2px #0d0d0d;transition:transform .15s,box-shadow .15s}
input[type=range]::-webkit-slider-thumb:hover{transform:scale(1.2);box-shadow:0 0 0 4px var(--ac)}
input[type=range]::-moz-range-track{height:4px;background:var(--bd);border:none;border-radius:2px}
input[type=range]::-moz-range-thumb{width:18px;height:18px;background:var(--ac);border:none;border-radius:50%}
input[type=range]:focus-visible{outline:none}
input[type=range]:focus-visible::-webkit-slider-thumb{box-shadow:0 0 0 4px var(--ac)}
.value{font-variant-numeric:tabular-nums;font-size:.8rem;color:var(--ac);min-width:3.5ch;text-align:right}
.checkbox-row{display:flex;align-items:center;gap:8px}
.checkbox-row input[type=checkbox]{width:20px;height:20px;accent-color:var(--ac);cursor:pointer;touch-action:manipulation}
.checkbox-row label{font-size:.85rem;cursor:pointer}
.info-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:8px 16px;font-size:.75rem}
.info-item{display:flex;justify-content:space-between;padding:6px 8px;background:var(--bg3);border-radius:8px}
.info-label{color:var(--fg2)}
.info-value{color:var(--fg);font-variant-numeric:tabular-nums;font-weight:600}
.file-list{display:flex;flex-direction:column;gap:6px;max-height:200px;overflow:auto}
.file-item{display:flex;align-items:center;gap:10px;padding:8px 10px;background:var(--bg3);border-radius:8px;font-size:.8rem}
.file-item input[type=radio]{accent-color:var(--ac);width:18px;height:18px}
.file-item .name{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.file-item .size{color:var(--fg2);font-size:.7rem;min-width:45px;text-align:right}
.file-item .del{padding:4px 8px;background:transparent;border:1px solid var(--bd);border-radius:6px;color:var(--fg2);font-size:.65rem;cursor:pointer;touch-action:manipulation}
.file-item .del:hover{background:var(--err);border-color:var(--err);color:#fff}
.empty-state{text-align:center;padding:24px;color:var(--fg2);font-size:.85rem}
.empty-state svg{width:48px;height:48px;margin-bottom:8px;opacity:.5}
.toast{position:fixed;bottom:calc(100% + 16px);left:50%;transform:translateX(-50%) translateY(20px);background:var(--bg2);border:1px solid var(--bd);padding:10px 16px;border-radius:10px;font-size:.8rem;z-index:300;opacity:0;pointer-events:none;transition:all .3s;box-shadow:0 10px 30px rgba(0,0,0,.4)}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}
.toast.err{border-color:var(--err);color:var(--err)}
.toast.ok{border-color:var(--ok);color:var(--ok)}
.modal{position:fixed;inset:0;background:rgba(0,0,0,.8);z-index:400;display:none;align-items:center;justify-content:center;padding:20px}
.modal.open{display:flex}
.modal-content{background:var(--bg2);border:1px solid var(--bd);border-radius:16px;width:100%;max-width:360px;max-height:80vh;overflow:auto}
.modal-header{padding:16px;border-bottom:1px solid var(--bd);display:flex;align-items:center;justify-content:space-between;font-weight:600}
.modal-body{padding:16px}
.modal-close{width:36px;height:36px;border:none;background:var(--bg3);border-radius:10px;color:var(--fg);display:flex;align-items:center;justify-content:center;cursor:pointer;touch-action:manipulation}
.help-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
.help-card{background:var(--bg3);border:1px solid var(--bd);border-radius:12px;padding:14px;text-align:center}
.help-card kbd{display:inline-block;background:var(--bg);border:1px solid var(--bd);border-radius:6px;padding:2px 8px;font-size:.7rem;font-family:inherit;font-weight:600;color:var(--ac);margin:2px}
.help-card p{font-size:.75rem;color:var(--fg2);margin-top:8px;line-height:1.5}
@media (hover:none){input[type=range]::-webkit-slider-thumb{transform:scale(1.3)}}
@media (max-width:480px){.help-grid{grid-template-columns:1fr}}
    /* styles.css 末尾に追加 */
    html { height: -webkit-fill-available; }
    body { height: 100vh; height: -webkit-fill-available; } /* 既存の body height:100vh の行を置き換え推奨 */