:root {
  --bg: #ffffff; --bg2: #f7f7f5; --fg: #202020; --fg2: #666;
  --line: #e6e6e4; --accent: #dc4c3e; --accent2: #246fe0;
  --p1: #d1453b; --p2: #eb8909; --p3: #246fe0; --p4: #999;
  --inprog: #0a8f5b; --done: #aaa;
  --sidebar-w: 260px; --detail-w: 340px;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #1f2430; --bg2: #171b24; --fg: #e8e8e8; --fg2: #9aa0ab; --line: #323847; }
}
* { box-sizing: border-box; margin: 0; }
body { font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic UI", sans-serif;
  background: var(--bg); color: var(--fg); height: 100dvh; overflow: hidden; }
.hidden { display: none !important; }
button { cursor: pointer; }

/* ---- login ---- */
.login { position: fixed; inset: 0; display: grid; place-items: center; background: var(--bg2); z-index: 50; }
.login-box { background: var(--bg); border: 1px solid var(--line); border-radius: 12px; padding: 32px; width: min(420px, 90vw); display: grid; gap: 12px; }
.login-box h1 { color: var(--accent); }
.login-box input { padding: 10px; border: 1px solid var(--line); border-radius: 8px; background: var(--bg2); color: var(--fg); }
.login-box button { padding: 10px; border: 0; border-radius: 8px; background: var(--accent); color: #fff; font-weight: 600; }
.error { color: var(--p1); min-height: 1.2em; font-size: 0.85em; }
.login-hint { color: var(--fg2); font-size: 0.75em; }

/* ---- layout ---- */
.app { display: grid; grid-template-columns: var(--sidebar-w) 1fr auto; height: 100dvh; }
.sidebar { background: var(--bg2); border-right: 1px solid var(--line); display: flex; flex-direction: column; padding: 12px; gap: 8px; overflow-y: auto; }
.brand { font-weight: 800; font-size: 1.2em; color: var(--accent); padding: 6px 10px 14px; }
.nav-item { display: flex; justify-content: space-between; padding: 7px 10px; border-radius: 8px; cursor: pointer; color: var(--fg); text-decoration: none; font-size: 0.95em; }
.nav-item:hover { background: var(--line); }
.nav-item.active { background: var(--line); font-weight: 600; }
.count { color: var(--fg2); font-size: 0.85em; }
.side-section { flex: 1; }
.side-head { display: flex; justify-content: space-between; align-items: center; color: var(--fg2); font-size: 0.8em; font-weight: 700; padding: 8px 10px 4px; text-transform: uppercase; }
.side-head button { border: 0; background: none; color: var(--fg2); font-size: 1.1em; }
.side-foot { display: grid; gap: 8px; }
.side-foot button { border: 0; background: var(--accent); color: #fff; border-radius: 8px; padding: 10px; font-weight: 600; }
.side-foot a { color: var(--fg2); font-size: 0.8em; text-align: center; cursor: pointer; }
.proj-dot { display: inline-block; width: 10px; height: 10px; border-radius: 50%; margin-right: 8px; }

.main { display: flex; flex-direction: column; overflow: hidden; }
.main-head { display: flex; justify-content: space-between; align-items: center; padding: 16px 24px; border-bottom: 1px solid var(--line); gap: 12px; }
.main-head input { padding: 8px 12px; border: 1px solid var(--line); border-radius: 8px; background: var(--bg2); color: var(--fg); width: 220px; }
.view-root { flex: 1; overflow: auto; padding: 12px 24px 80px; }

/* ---- task list ---- */
.task-row { display: flex; align-items: flex-start; gap: 10px; padding: 8px 6px; border-bottom: 1px solid var(--line); cursor: pointer; border-radius: 6px; }
.task-row:hover { background: var(--bg2); }
.task-row.selected { outline: 2px solid var(--accent2); outline-offset: -2px; }
.task-row .chk { flex: none; width: 20px; height: 20px; margin-top: 1px; border: 2px solid var(--p4); border-radius: 50%; background: none; display: grid; place-items: center; font-size: 12px; color: transparent; }
.task-row .chk.p1 { border-color: var(--p1); background: color-mix(in srgb, var(--p1) 12%, transparent); }
.task-row .chk.p2 { border-color: var(--p2); background: color-mix(in srgb, var(--p2) 12%, transparent); }
.task-row .chk.p3 { border-color: var(--p3); background: color-mix(in srgb, var(--p3) 12%, transparent); }
.task-row .chk:hover { color: var(--fg2); }
.task-row.done .chk { background: var(--done); border-color: var(--done); color: #fff; }
.task-row.done .t-content { text-decoration: line-through; color: var(--fg2); }
.t-body { flex: 1; min-width: 0; }
.t-content { font-size: 0.95em; }
.t-meta { display: flex; flex-wrap: wrap; gap: 8px; font-size: 0.78em; color: var(--fg2); margin-top: 2px; }
.t-meta .overdue { color: var(--p1); font-weight: 600; }
.badge { border-radius: 4px; padding: 0 6px; font-weight: 600; }
.badge.inprog { background: color-mix(in srgb, var(--inprog) 15%, transparent); color: var(--inprog); border-left: 3px solid var(--inprog); }
.badge.res { background: color-mix(in srgb, var(--accent2) 12%, transparent); color: var(--accent2); }
.subtask-indent { margin-left: 28px; }
.collapse-btn { border: 0; background: none; color: var(--fg2); width: 18px; flex: none; margin-top: 2px; }
.sec-head { font-weight: 700; margin: 18px 0 4px; font-size: 0.9em; color: var(--fg2); }
.empty { color: var(--fg2); text-align: center; margin-top: 60px; }

/* ---- detail panel ---- */
.detail { width: var(--detail-w); border-left: 1px solid var(--line); background: var(--bg2); overflow-y: auto; padding: 16px; }
.detail h3 { margin-bottom: 8px; }
.detail .field { margin-bottom: 14px; }
.detail label { display: block; font-size: 0.75em; color: var(--fg2); font-weight: 700; margin-bottom: 4px; }
.detail input, .detail select, .detail textarea { width: 100%; padding: 7px 9px; border: 1px solid var(--line); border-radius: 6px; background: var(--bg); color: var(--fg); font-family: inherit; }
.detail textarea { resize: vertical; min-height: 60px; }
.detail .row2 { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.detail .hint { color: var(--fg2); font-size: 0.72em; margin-top: 4px; }
.detail .close-btn { float: right; border: 0; background: none; color: var(--fg2); font-size: 1.2em; }
.detail .danger { background: none; border: 1px solid var(--p1); color: var(--p1); border-radius: 6px; padding: 7px 12px; }
.status-seg { display: flex; border: 1px solid var(--line); border-radius: 8px; overflow: hidden; }
.status-seg button { flex: 1; padding: 8px 4px; border: 0; background: var(--bg); color: var(--fg2); font-size: 0.85em; }
.status-seg button.active-todo { background: var(--line); color: var(--fg); font-weight: 700; }
.status-seg button.active-prog { background: var(--inprog); color: #fff; font-weight: 700; }
.status-seg button.active-done { background: var(--done); color: #fff; font-weight: 700; }
.res-chips { display: flex; flex-wrap: wrap; gap: 6px; }
.res-chip { border: 1px solid var(--line); border-radius: 999px; padding: 4px 12px; background: var(--bg); color: var(--fg2); font-size: 0.85em; }
.res-chip.on { background: var(--accent2); border-color: var(--accent2); color: #fff; }
.sub-list { margin-top: 6px; }
.add-sub { border: 0; background: none; color: var(--accent2); padding: 6px 0; font-size: 0.85em; }

/* ---- gantt ---- */
.gantt-tools { display: flex; gap: 10px; margin-bottom: 12px; flex-wrap: wrap; align-items: center; }
.gantt-tools select { padding: 6px 10px; border: 1px solid var(--line); border-radius: 6px; background: var(--bg2); color: var(--fg); }
.gantt-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 8px; }
.gantt-wrap svg { display: block; }

/* ---- resources ---- */
.res-table { width: 100%; border-collapse: collapse; }
.res-table th, .res-table td { text-align: left; padding: 10px 8px; border-bottom: 1px solid var(--line); font-size: 0.9em; }
.res-table th { color: var(--fg2); font-size: 0.78em; text-transform: uppercase; }
.res-form { display: flex; gap: 8px; margin-top: 16px; flex-wrap: wrap; }
.res-form input, .res-form select { padding: 8px; border: 1px solid var(--line); border-radius: 6px; background: var(--bg2); color: var(--fg); }
.res-form button { border: 0; border-radius: 6px; background: var(--accent2); color: #fff; padding: 8px 16px; font-weight: 600; }
.icon-btn { border: 0; background: none; color: var(--fg2); }

/* ---- quick add ---- */
dialog { border: 1px solid var(--line); border-radius: 12px; background: var(--bg); color: var(--fg); width: min(560px, 92vw); padding: 18px; }
dialog::backdrop { background: rgb(0 0 0 / .35); }
#qa-input { width: 100%; padding: 12px; font-size: 1.05em; border: 1px solid var(--line); border-radius: 8px; background: var(--bg2); color: var(--fg); }
.qa-hint { color: var(--fg2); font-size: 0.75em; margin-top: 8px; }
.qa-preview { margin-top: 8px; font-size: 0.85em; color: var(--accent2); min-height: 1.3em; }
dialog menu { display: flex; justify-content: flex-end; gap: 8px; padding: 0; margin: 12px 0 0; }
dialog menu button { padding: 8px 18px; border-radius: 6px; border: 1px solid var(--line); background: var(--bg2); color: var(--fg); }
dialog menu #qa-ok { background: var(--accent); border-color: var(--accent); color: #fff; font-weight: 600; }

/* ---- 汎用モーダル ---- */
#modal { width: min(420px, 92vw); }
#modal h3 { margin-bottom: 12px; font-size: 1em; white-space: pre-line; line-height: 1.5; }
#modal-input { width: 100%; padding: 10px; border: 1px solid var(--line); border-radius: 8px; background: var(--bg2); color: var(--fg); }
.palette { display: grid; grid-template-columns: repeat(8, 1fr); gap: 8px; }
.color-dot { width: 100%; aspect-ratio: 1; border-radius: 50%; border: 2px solid transparent; cursor: pointer; }
.color-dot.on { border-color: var(--fg); box-shadow: 0 0 0 2px var(--bg) inset; }

/* ---- ヘッダーのプロジェクト操作 ---- */
.head-actions { display: flex; align-items: center; gap: 8px; }
#project-actions { display: flex; gap: 2px; }
#project-actions .icon-btn { font-size: 1em; padding: 6px 8px; border-radius: 6px; }
#project-actions .icon-btn:hover { background: var(--bg2); }

/* ---- toast ---- */
.toast { position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%); background: var(--fg); color: var(--bg); border-radius: 8px; padding: 10px 18px; z-index: 60; display: flex; gap: 14px; align-items: center; }
.toast button { border: 0; background: none; color: var(--accent2); font-weight: 700; }

@media (max-width: 900px) {
  .app { grid-template-columns: 1fr; }
  .sidebar { position: fixed; inset: auto 0 0 0; flex-direction: row; align-items: center; border-top: 1px solid var(--line); border-right: 0; padding: 6px; z-index: 40; overflow-x: auto; }
  .brand, .side-head, .side-foot a { display: none; }
  .side-section { flex: none; }
  .detail { position: fixed; inset: 0; width: auto; z-index: 45; }
}