:root{
  --bg:#f6f7f9; --card:#fff; --text:#1c2024; --muted:#6b7280; --line:#e3e6ea;
  --accent:#2563eb; --accent-weak:#eff4ff;
  --overdue:#dc2626; --overdue-bg:#fef2f2; --today:#d97706; --today-bg:#fffbeb;
  --high:#dc2626; --mid:#6b7280; --low:#9ca3af;
}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--text);
  font-family:"Segoe UI","Hiragino Kaku Gothic ProN","Yu Gothic UI",Meiryo,sans-serif;
  font-size:14px;line-height:1.6;padding:0 0 60px}
h1{font-size:18px;margin:0}
h2{font-size:16px;margin:0 0 12px}
button{font:inherit;cursor:pointer;border-radius:6px;border:1px solid transparent;padding:7px 14px}
button.primary{background:var(--accent);color:#fff}
button.primary:hover{background:#1d4ed8}
button.ghost{background:#fff;border-color:var(--line);color:var(--text)}
button.ghost:hover{background:#f0f2f5}
button.small{padding:4px 10px;font-size:13px}
input,select,textarea{font:inherit;padding:7px 9px;border:1px solid var(--line);
  border-radius:6px;background:#fff;color:var(--text)}
input:focus,select:focus,textarea:focus{outline:2px solid var(--accent-weak);border-color:var(--accent)}
textarea{width:100%;resize:vertical}
label{display:block}
label.inline{display:inline-flex;align-items:center;gap:6px;color:var(--muted);white-space:nowrap}
.muted{color:var(--muted)}
.hint{font-size:12px;color:var(--muted)}
.error{color:var(--overdue);font-size:13px;background:var(--overdue-bg);
  padding:8px 10px;border-radius:6px;border:1px solid #fecaca}
.banner{background:#fffbeb;border-bottom:1px solid #fde68a;padding:8px 16px;font-size:13px}

/* 認証画面 */
.auth-card{max-width:380px;margin:80px auto;background:var(--card);padding:28px;
  border:1px solid var(--line);border-radius:10px}
.auth-card label{margin:14px 0}
.auth-card input{width:100%;margin-top:4px}
.auth-card button.primary{width:100%;margin-top:16px;padding:10px}

/* 本体 */
#appView{max-width:860px;margin:0 auto;padding:20px 16px}
.topbar{display:flex;align-items:center;justify-content:space-between;
  gap:12px;flex-wrap:wrap;margin-bottom:18px}
.topbar-right{display:flex;align-items:center;gap:10px;font-size:13px}

.add-box{background:var(--card);border:1px solid var(--line);border-radius:10px;
  padding:14px;margin-bottom:14px}
.add-row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.add-row+.add-row{margin-top:10px}
.add-row.sub{font-size:13px}
.add-row #addTitle{flex:1;min-width:220px;padding:10px 12px;font-size:15px}

.controls{display:flex;align-items:center;gap:16px;flex-wrap:wrap;
  padding:0 4px 10px;font-size:13px}
.controls .spacer{flex:1}

.summary{background:var(--accent-weak);border:1px solid #c7dbff;border-radius:8px;
  padding:10px 12px;margin-bottom:12px;font-size:13px}

.task-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:8px}
.task{background:var(--card);border:1px solid var(--line);border-left:4px solid var(--line);
  border-radius:8px;padding:12px 14px;display:flex;gap:12px;align-items:flex-start}
.task.overdue{border-left-color:var(--overdue);background:var(--overdue-bg)}
.task.today{border-left-color:var(--today);background:var(--today-bg)}
.task.done{opacity:.55}
.task.done .task-title{text-decoration:line-through}
.task input[type=checkbox]{width:18px;height:18px;margin-top:2px;flex:none;cursor:pointer}
.task-body{flex:1;min-width:0}
.task-title{font-size:15px;font-weight:600;word-break:break-word}
.task-meta{display:flex;gap:10px;flex-wrap:wrap;font-size:12px;color:var(--muted);margin-top:4px}
.tag{display:inline-block;padding:1px 7px;border-radius:99px;border:1px solid var(--line);background:#fff}
.tag.due-overdue{color:var(--overdue);border-color:#fecaca;font-weight:600}
.tag.due-today{color:var(--today);border-color:#fde68a;font-weight:600}
.tag.p-high{color:var(--high);border-color:#fecaca}
.tag.p-mid{color:var(--mid)}
.tag.p-low{color:var(--low)}
.task-memo{margin-top:6px;font-size:13px;color:#374151;white-space:pre-wrap;
  background:#fafbfc;border:1px solid var(--line);border-radius:6px;padding:8px}
.task-memo[hidden]{display:none}
.memo-link{background:none;border:none;color:var(--accent);padding:0;font-size:12px;text-decoration:underline}
.task-actions{display:flex;gap:6px;flex:none}
.empty{text-align:center;padding:40px 0}

/* 編集ダイアログ */
.overlay{position:fixed;inset:0;background:rgba(17,24,39,.45);display:flex;
  align-items:center;justify-content:center;padding:16px;z-index:50}
.modal{background:var(--card);border-radius:10px;padding:22px;width:100%;max-width:520px;
  max-height:90vh;overflow:auto}
.modal label{margin:12px 0;font-size:13px;color:var(--muted)}
.modal input,.modal select{width:100%;margin-top:4px;color:var(--text)}
.modal-row{display:flex;gap:12px;flex-wrap:wrap}
.modal-row label{flex:1;min-width:130px}
.modal-actions{display:flex;justify-content:flex-end;gap:10px;margin-top:18px}

/* display 指定を持つ要素でも hidden 属性を効かせる */
[hidden]{display:none !important}

/* 確認中（相手の返答待ちなど、自分の手が止まっている状態） */
.task.waiting{border-left-color:#7c3aed;background:#faf7ff}
.tag.st-waiting{color:#6d28d9;border-color:#ddd0fb;font-weight:600}
.tag.st-done{color:var(--muted)}