:root {
  --bg: #f4f7f6;
  --card: #ffffff;
  --text: #1f2d2a;
  --muted: #6b7b77;
  --primary: #1f8a70;
  --primary-dark: #17705a;
  --danger: #c0392b;
  --line: #dde5e2;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
  line-height: 1.6;
  font-size: 16px;
}

#app { max-width: 640px; margin: 0 auto; padding: 0 16px 48px; }

h2 { font-size: 1.25rem; margin: 24px 0 12px; }
h3 { font-size: 1.05rem; margin: 0 0 4px; }

.top {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}
.brand { font-weight: 700; color: var(--primary-dark); text-decoration: none; }
.who { display: flex; align-items: center; gap: 8px; font-size: 0.9rem; }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px;
  margin: 12px 0;
}

.auth { margin-top: 32px; }
.tabs { display: flex; gap: 8px; margin-bottom: 16px; }
.tab {
  flex: 1;
  padding: 10px;
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 8px;
  font-size: 1rem;
  cursor: pointer;
}
.tab.on { background: var(--primary); color: #fff; border-color: var(--primary); }

label { display: block; margin: 12px 0; }
.lbl { display: block; font-size: 0.85rem; color: var(--muted); margin-bottom: 4px; }

input[type="text"], input[type="email"], input[type="password"], input[type="number"], input[type="datetime-local"], textarea, select {
  width: 100%;
  padding: 11px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font-size: 1rem;
  font-family: inherit;
  background: #fff;
}
input:focus, textarea:focus, select:focus { outline: 2px solid var(--primary); outline-offset: 0; }

.btn {
  display: inline-block;
  padding: 10px 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--text);
  font-size: 1rem;
  text-decoration: none;
  cursor: pointer;
}
.btn.primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn.primary:hover { background: var(--primary-dark); }
.btn.small { padding: 6px 10px; font-size: 0.85rem; }
.btn.danger { color: var(--danger); border-color: var(--danger); }
.btn:disabled { opacity: 0.5; cursor: default; }

.msg { color: var(--danger); min-height: 1.4em; margin: 8px 0; font-size: 0.9rem; }
.msg.ok { color: var(--primary-dark); }

.muted { color: var(--muted); }
.small { font-size: 0.85rem; }

.grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; margin: 12px 0; }
.tile {
  display: block;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 18px 12px;
  text-align: center;
  color: var(--text);
  text-decoration: none;
  font-weight: 700;
}
a.tile:hover { border-color: var(--primary); }
.tile.off { color: var(--muted); font-weight: 400; background: #eef2f1; }
.tile .sub { display: block; font-size: 0.75rem; font-weight: 400; color: var(--muted); }

.body { white-space: pre-wrap; word-break: break-word; margin: 8px 0; }
.code { font-family: ui-monospace, Menlo, monospace; font-size: 1.1rem; letter-spacing: 0.1em; font-weight: 700; }
.row { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin: 6px 0; }
.row .grow { flex: 1; min-width: 140px; }
ul.plain { list-style: none; padding: 0; margin: 6px 0; }
ul.plain li { padding: 4px 0; border-bottom: 1px dashed var(--line); }

/* ===== 第2段階 ===== */
a.card-link { display: block; color: inherit; text-decoration: none; }
a.card-link:hover { border-color: var(--primary); }
.subform { background: #f7faf9; border: 1px solid var(--line); border-radius: 10px; padding: 8px 12px; margin: 8px 0; }

.badge { display: inline-block; padding: 1px 8px; border-radius: 999px; font-size: 0.75rem; background: #e8eeec; color: var(--muted); margin-right: 4px; white-space: nowrap; }
.badge.ok { background: #dff3ea; color: var(--primary-dark); }
.badge.warn { background: #fdeccd; color: #8a5a00; }
.badge.bad { background: #fbdcd8; color: var(--danger); }

.cal-nav { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin: 12px 0; }
.cal-title { font-weight: 700; font-size: 1.1rem; }
.cal-grid { display: grid; grid-template-columns: repeat(7, 1fr); gap: 3px; margin: 8px 0 16px; }
.cal-dow { text-align: center; font-size: 0.75rem; color: var(--muted); padding: 2px 0; }
.cal-dow.sun, .cal-day.sun { color: var(--danger); }
.cal-dow.sat, .cal-day.sat { color: #2a6fb0; }
.cal-cell { min-height: 62px; background: var(--card); border: 1px solid var(--line); border-radius: 6px; padding: 2px; overflow: hidden; }
.cal-cell.empty { background: transparent; border-color: transparent; }
.cal-cell.today { border-color: var(--primary); box-shadow: inset 0 0 0 1px var(--primary); }
.cal-day { font-size: 0.75rem; text-align: right; padding-right: 2px; }
.chip { display: block; margin-top: 2px; padding: 1px 3px; border-radius: 4px; background: var(--primary); color: #fff; font-size: 0.7rem; line-height: 1.3; text-decoration: none; text-align: center; overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }
.chip.canceled { background: #c9d3d0; text-decoration: line-through; }

.big { font-size: 1.25rem; font-weight: 700; margin: 4px 0; }
.sect { margin: 20px 0 6px; font-size: 1.05rem; font-weight: 700; }
.right { text-align: right; }

.picker { margin: 8px 0; }
.pick-list { margin-top: 6px; }
.pick-item { display: flex; align-items: center; gap: 8px; padding: 4px 0; border-bottom: 1px dashed var(--line); }
.pick-thumb { width: 44px; height: 44px; object-fit: cover; border-radius: 6px; }
.pick-icon { width: 44px; text-align: center; font-size: 1.4rem; }
.pick-name { flex: 1; font-size: 0.85rem; word-break: break-all; }

.gallery { display: flex; flex-wrap: wrap; gap: 8px; margin: 8px 0; }
.gitem { position: relative; }
.gthumb { display: block; width: 104px; height: 104px; object-fit: cover; border-radius: 8px; border: 1px solid var(--line); }
.filelink { display: inline-block; padding: 8px 10px; border: 1px solid var(--line); border-radius: 8px; background: #fff; color: var(--text); font-size: 0.85rem; text-decoration: none; word-break: break-all; }
.gdel { display: block; margin-top: 4px; width: 100%; }
.gallery .muted { width: 100%; margin: 0; }
.chip-sub { display: block; font-size: 0.6rem; opacity: 0.9; overflow: hidden; text-overflow: ellipsis; }

/* ===== 画面上部/下部のメニュー・戻るボタン ===== */
.menubar { display: flex; gap: 4px; margin-left: auto; }
.mi { display: flex; align-items: center; gap: 4px; padding: 6px 10px; border-radius: 8px; color: var(--text); text-decoration: none; font-size: 0.9rem; white-space: nowrap; }
.mi:hover { background: #e8eeec; }
.mi.on { background: var(--primary); color: #fff; }
.mi .ic { font-size: 1rem; line-height: 1; }
.subnav { display: flex; gap: 8px; padding: 10px 0 0; }
.subnav .btn { text-decoration: none; }

@media (min-width: 761px) {
  #app { max-width: 900px; }
  .top { position: sticky; top: 0; z-index: 20; background: var(--bg); }
}
@media (max-width: 760px) {
  #app { padding-bottom: 88px; }
  .menubar {
    position: fixed; left: 0; right: 0; bottom: 0; z-index: 30; margin: 0; gap: 0;
    background: #fff; border-top: 1px solid var(--line);
    padding: 4px 4px calc(4px + env(safe-area-inset-bottom));
  }
  .mi { flex: 1; flex-direction: column; gap: 0; padding: 4px 2px; font-size: 0.68rem; border-radius: 6px; }
  .mi .ic { font-size: 1.3rem; }
}

/* ===== 確認が必要なこと ===== */
.notice-card { border-color: #e9c46a; background: #fffaf0; }
.notice-card.ok { border-color: var(--line); background: var(--card); }
.notice-list { margin: 6px 0 0; }
.nt { display: flex; align-items: center; gap: 8px; padding: 8px 0 8px 10px; border-left: 4px solid #e9c46a; }
.nt.bad { border-left-color: var(--danger); }
.nt.info { border-left-color: var(--line); }
.nt a { flex: 1; color: var(--text); text-decoration: none; }
.nt.bad a { color: var(--danger); font-weight: 700; }
.nt-go { color: var(--muted); }
.modal-back { position: fixed; inset: 0; z-index: 100; background: rgba(20, 30, 28, 0.5); display: flex; align-items: center; justify-content: center; padding: 16px; }
.modal { background: #fff; border-radius: 14px; padding: 18px; width: 100%; max-width: 440px; max-height: 80vh; overflow: auto; box-shadow: 0 10px 40px rgba(0,0,0,0.3); }
.modal h3 { font-size: 1.15rem; margin-bottom: 8px; }

/* ===== 宿題管理(生徒ごとのタブ) ===== */
.hw-layout { display: grid; grid-template-columns: 150px 1fr; gap: 16px; align-items: start; }
.hw-tabs { display: flex; flex-direction: column; border-top: 1px solid var(--line); }
.hw-tab { display: flex; flex-direction: column; gap: 2px; padding: 14px 10px; border-bottom: 1px solid var(--line); color: var(--text); text-decoration: none; font-weight: 700; }
.hw-tab:hover { background: #e8eeec; }
.hw-tab.on { background: var(--primary); color: #fff; }
.hw-tab .badge { align-self: flex-start; margin: 0; }
.hw-cols { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; align-items: start; }
.hw-col .card { margin: 8px 0; padding: 12px; }
.hw-col .big { font-size: 1rem; }
@media (max-width: 760px) {
  .hw-layout { grid-template-columns: 1fr; gap: 8px; }
  .hw-tabs { flex-direction: row; overflow-x: auto; border-top: 0; gap: 6px; }
  .hw-tab { flex: 0 0 auto; border: 1px solid var(--line); border-radius: 8px; padding: 8px 14px; flex-direction: row; align-items: center; gap: 6px; }
  .hw-cols { grid-template-columns: 1fr; }
}

/* ===== スマホの宿題管理 ===== */
.btn.block { display: block; width: 100%; text-align: center; text-decoration: none; padding: 12px; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 6px; }
.chips .badge { margin: 0; font-size: 0.85rem; padding: 3px 10px; }
.seg { display: flex; border: 1px solid var(--line); border-radius: 10px; overflow: hidden; background: #fff; margin: 8px 0 12px; }
.seg-tab { flex: 1; text-align: center; padding: 10px 4px; font-size: 0.85rem; color: var(--text); text-decoration: none; border-left: 1px solid var(--line); }
.seg-tab:first-child { border-left: 0; }
.seg-tab.on { background: var(--primary); color: #fff; font-weight: 700; }

/* ===== PCの宿題管理: 生徒の一覧と宿題一覧を、枠と色で区切る ===== */
.hw-tabs { background: #fff; border: 1px solid var(--line); border-radius: 12px; overflow: hidden; }
.hw-tab { border-bottom: 1px solid var(--line); }
.hw-tab:last-child { border-bottom: 0; }
.hw-tab.on { box-shadow: inset 4px 0 0 var(--primary-dark); }
.hw-main { background: #fff; border: 1px solid var(--line); border-radius: 12px; padding: 16px; }
.hw-main > h3 { padding-bottom: 10px; margin-bottom: 12px !important; border-bottom: 2px solid var(--primary); font-size: 1.1rem; }
.hw-col { background: #eef3f1; border: 1px solid var(--line); border-radius: 10px; padding: 10px; }
.hw-col .sect { padding-bottom: 6px; border-bottom: 1px solid var(--line); }
.hw-col .card { background: #fff; }

/* 見るだけの表示 / 編集中 */
.editing-banner { margin: 8px 0 6px; padding: 8px 12px; border-radius: 10px; background: #fff4d6; color: #7a5200; font-weight: 700; font-size: 0.9rem; }
.card.editing { border: 2px solid #e0b84a; background: #fffdf6; }
.status-banner { display: block; padding: 10px 14px; margin: 0 0 10px; border-radius: 10px; font-weight: 700; font-size: 1rem; }
.status-banner.ok { background: #d8f2e4; color: #0f5a3a; border: 1px solid #8fd1ad; font-size: 1.1rem; }
.status-banner.wait { background: #fdeccd; color: #8a5a00; border: 1px solid #ecc67c; }
.status-banner.draft { background: #e8eeec; color: #455; border: 1px solid #c8d3cf; }
.status-banner.none { background: #f1f1f1; color: #666; }

/* お支払い */
.pay-status { display: inline-block; padding: 4px 14px; border-radius: 999px; font-weight: 800; font-size: 1.05rem; }
.pay-status.ok { background: #d8f2e4; color: #0f5a3a; border: 1px solid #8fd1ad; }
.pay-status.wait { background: #fdeccd; color: #8a5a00; border: 1px solid #ecc67c; }
.pay-status.draft { background: #e3ebf7; color: #24457a; border: 1px solid #a9bfe3; }
.pay-amount { font-size: 1.5rem; font-weight: 800; margin: 4px 0; }
.card.pay.paid { background: #fbfdfc; }
.card.pay.unpaid { border-color: #ecc67c; }
.bank-info { white-space: pre-wrap; font-weight: 600; line-height: 1.7; margin-top: 4px; }
.meter { height: 12px; background: #e6ece9; border-radius: 999px; overflow: hidden; }
.meter-fill { height: 100%; background: #3f8a6c; }
.meter-fill.warn { background: #e0a526; }
.meter-fill.bad { background: #c0392b; }