:root{
  --paper:#F6F1E4;
  --paper-deep:#EFE7D3;
  --ink:#22301F;
  --pine:#2F4A3B;
  --pine-deep:#1D3128;
  --rose:#B8637A;
  --rose-deep:#9C4C61;
  --moss:#6B8F71;
  --line:#CBB99A;
  --line-soft:#DED2B4;
  --paper-shadow: rgba(47,74,59,0.10);
  --danger:#A64B3F;
}
*{box-sizing:border-box;}
body{
  margin:0;
  font-size:18.5px;
  background:
    radial-gradient(circle at 15% 8%, rgba(184,99,122,0.06), transparent 40%),
    radial-gradient(circle at 90% 90%, rgba(47,74,59,0.07), transparent 45%),
    var(--paper);
  color:var(--ink);
  font-family:'Zen Kaku Gothic New', sans-serif;
  min-height:100vh;
  padding-bottom:60px;
}
.num{font-family:'JetBrains Mono','Zen Kaku Gothic New',monospace; font-variant-numeric: tabular-nums;}
header.app-header{
  background:var(--pine-deep);
  color:#F2ECDD;
  padding:22px 20px 18px;
  position:relative;
  overflow:hidden;
  display:flex;
  align-items:flex-start;
  justify-content:space-between;
  gap:12px;
}
header.app-header::after{
  content:"";
  position:absolute; left:0; right:0; bottom:0; height:10px;
  background-image: radial-gradient(circle at 10px 0, transparent 9px, var(--pine-deep) 9px);
  background-size: 20px 10px;
  background-position: 0 0;
  transform: translateY(1px);
}
.app-title{
  font-family:'Shippori Mincho', serif;
  font-size:28.5px;
  font-weight:700;
  letter-spacing:.04em;
  margin:0;
}
.app-sub{
  font-size:15.5px;
  opacity:.75;
  margin-top:4px;
  letter-spacing:.05em;
}
.header-user{
  display:flex;
  flex-direction:column;
  align-items:flex-end;
  gap:6px;
  font-size:14px;
  opacity:.9;
  z-index:1;
  padding-top:4px;
}
.logout-btn{
  background:transparent;
  border:1px solid rgba(242,236,221,0.5);
  color:#F2ECDD;
  padding:5px 12px;
  border-radius:14px;
  font-size:14px;
  cursor:pointer;
  font-family:'Zen Kaku Gothic New', sans-serif;
}
.logout-btn:hover{background:rgba(242,236,221,0.12);}
nav.tabs{
  display:flex;
  gap:6px;
  padding:14px 14px 0;
  overflow-x:auto;
  background:var(--paper);
}
nav.tabs button{
  flex:0 0 auto;
  border:1px solid var(--line);
  border-bottom:none;
  background:var(--paper-deep);
  color:var(--pine);
  font-family:'Zen Kaku Gothic New', sans-serif;
  font-weight:700;
  font-size:17px;
  padding:10px 16px;
  border-radius:10px 10px 0 0;
  cursor:pointer;
  letter-spacing:.03em;
}
nav.tabs button.active{
  background:var(--paper);
  color:var(--pine-deep);
  border-bottom:2px solid var(--paper);
  margin-bottom:-1px;
  box-shadow: 0 -2px 0 rgba(0,0,0,0);
}
main{
  padding:16px;
  max-width:760px;
  margin:0 auto;
}
.card{
  background:var(--paper);
  border:1px solid var(--line);
  border-radius:4px 4px 14px 14px;
  box-shadow: 0 3px 10px var(--paper-shadow);
  margin-bottom:16px;
  overflow:hidden;
}
.card-head{
  background:var(--paper-deep);
  border-bottom:1px dashed var(--line);
  padding:12px 16px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  flex-wrap:wrap;
  gap:8px;
}
.card-head h2{
  font-family:'Shippori Mincho', serif;
  font-size:20.5px;
  margin:0;
  color:var(--pine-deep);
  display:flex;
  align-items:center;
  gap:8px;
}
.card-body{padding:14px 16px 16px;}
label.field-label{
  display:block;
  font-size:15.5px;
  font-weight:700;
  color:var(--pine);
  margin-bottom:4px;
  letter-spacing:.03em;
}
select, input[type=text], input[type=number], input[type=date], input[type=email], input[type=password]{
  font-family:'Zen Kaku Gothic New', sans-serif;
  font-size:18.5px;
  padding:8px 10px;
  border:1px solid var(--line);
  border-radius:8px;
  background:#fff;
  color:var(--ink);
  width:100%;
}
input[type=number]{font-family:'JetBrains Mono',monospace;}
.row{display:flex; gap:10px; flex-wrap:wrap;}
.row > div{flex:1; min-width:120px;}
.date-picker{display:flex; gap:6px;}
.date-picker select{flex:1; min-width:0; width:auto; padding:8px 4px;}
@media (max-width: 480px){
  .row{flex-direction:column;}
  .row > div{min-width:0;}
}
.btn{
  display:inline-flex;
  align-items:center;
  gap:6px;
  background:var(--pine);
  color:#F2ECDD;
  border:none;
  padding:10px 18px;
  border-radius:20px;
  font-weight:700;
  font-size:18px;
  cursor:pointer;
  letter-spacing:.03em;
}
.btn:hover{background:var(--pine-deep);}
.btn:disabled{opacity:.5; cursor:not-allowed;}
.btn.rose{background:var(--rose);}
.btn.rose:hover{background:var(--rose-deep);}
.btn.ghost{
  background:transparent;
  color:var(--pine);
  border:1px solid var(--pine);
}
.btn.small{padding:6px 12px; font-size:16px; border-radius:14px;}
.btn.danger-ghost{background:transparent; color:var(--danger); border:1px solid var(--danger); }
.student-row{
  display:flex;
  align-items:center;
  gap:10px;
  padding:10px 6px;
  border-bottom:1px solid var(--line-soft);
  flex-wrap:wrap;
}
.student-row:last-child{border-bottom:none;}
.student-name{
  min-width:110px;
  font-weight:700;
  display:flex;
  align-items:center;
  gap:6px;
}
.student-name input[type=checkbox]{width:17px;height:17px;accent-color:var(--pine);}
.mini-fields{
  display:flex; gap:8px; flex-wrap:wrap; flex:1;
  opacity:0.35; pointer-events:none; transition:opacity .15s;
}
.mini-fields.active{opacity:1; pointer-events:auto;}
.mini-fields .mf{display:flex; flex-direction:column; gap:2px;}
.mini-fields .mf label{font-size:14.5px; color:var(--pine); font-weight:700;}
.mini-fields input, .mini-fields select{width:112px; padding:8px 10px; font-size:17px;}
.mini-fields .fee-check{width:auto; display:flex; align-items:center; gap:4px; font-size:14.5px; color:var(--rose-deep); font-weight:700;}
.mini-fields .fee-check input{width:15px;height:15px; accent-color:var(--rose);}
.empty{
  text-align:center;
  padding:30px 10px;
  color:#8a8065;
  font-size:18px;
}
.total-strip{
  display:flex;
  justify-content:space-between;
  padding:10px 16px;
  background:var(--pine-deep);
  color:#F2ECDD;
  font-size:17px;
  font-weight:700;
}
.total-strip .amt{font-family:'JetBrains Mono',monospace; font-size:19.5px;}
table.ledger{width:100%; border-collapse:collapse; font-size:17px;}
table.ledger th{
  text-align:left;
  font-size:15px;
  color:var(--pine);
  border-bottom:1px solid var(--line);
  padding:6px 6px;
  letter-spacing:.03em;
}
table.ledger td{
  padding:7px 6px;
  border-bottom:1px dashed var(--line-soft);
  vertical-align:top;
}
table.ledger tr:last-child td{border-bottom:none;}

/* Wide financial tables collapse into stacked cards on narrow screens */
@media (max-width: 700px){
  table.stack-mobile{border:none; width:100%;}
  table.stack-mobile thead{
    position:absolute; width:1px; height:1px; overflow:hidden;
    clip:rect(0,0,0,0); white-space:nowrap;
  }
  table.stack-mobile, table.stack-mobile tbody, table.stack-mobile tr, table.stack-mobile td{
    display:block; width:100%;
  }
  table.stack-mobile tr{
    border:1px solid var(--line);
    border-radius:10px;
    margin-bottom:12px;
    padding:8px 12px;
    background:var(--paper);
  }
  table.stack-mobile tr.stack-total-row{
    border:2px solid var(--pine);
    background:var(--paper-deep);
  }
  table.stack-mobile td{
    display:flex;
    justify-content:space-between;
    align-items:center;
    gap:10px;
    padding:7px 2px;
    border-bottom:1px dashed var(--line-soft);
    text-align:right;
  }
  table.stack-mobile td:last-child{border-bottom:none;}
  table.stack-mobile td[data-label]::before{
    content:attr(data-label);
    font-weight:700;
    color:var(--pine);
    text-align:left;
    margin-right:auto;
  }
  table.stack-mobile td.stack-name{
    font-family:'Shippori Mincho', serif;
    font-size:17px;
    justify-content:flex-start;
    border-bottom:1px solid var(--line);
    margin-bottom:4px;
    padding-bottom:8px;
  }
  table.stack-mobile td.stack-name::before{content:'';}
}

.tag{
  display:inline-block;
  background:var(--paper-deep);
  border:1px solid var(--line);
  border-radius:10px;
  padding:2px 8px;
  font-size:15px;
  color:var(--pine-deep);
}
.master-list-item{
  display:flex; align-items:center; justify-content:space-between;
  padding:9px 4px; border-bottom:1px solid var(--line-soft); gap:8px; flex-wrap:wrap;
}
.master-list-item:last-child{border-bottom:none;}
.pill{background:var(--paper-deep); border:1px solid var(--line); border-radius:8px; padding:5px 10px; font-size:16.5px;}
.toast{
  position:fixed; bottom:22px; left:50%; transform:translateX(-50%);
  background:var(--pine-deep); color:#F2ECDD; padding:10px 20px; border-radius:20px;
  font-size:17px; font-weight:700; box-shadow:0 4px 14px rgba(0,0,0,.2);
  opacity:0; pointer-events:none; transition:opacity .25s, transform .25s;
  z-index:50;
}
.toast.show{opacity:1; transform:translateX(-50%) translateY(-6px);}
.summary-grid{display:grid; grid-template-columns:repeat(auto-fit,minmax(130px,1fr)); gap:10px; margin-top:10px;}
.summary-box{background:var(--paper-deep); border:1px solid var(--line); border-radius:10px; padding:10px 12px;}
.summary-box .lbl{font-size:15px; color:var(--pine); font-weight:700;}
.summary-box .val{font-family:'JetBrains Mono',monospace; font-size:22px; font-weight:600; margin-top:2px; color:var(--pine-deep);}
.day-block{border:1px solid var(--line-soft); border-radius:10px; margin-top:12px; overflow:hidden;}
.day-block h4{
  margin:0; padding:8px 12px; background:var(--paper-deep); font-size:17px;
  font-family:'Shippori Mincho',serif; color:var(--pine-deep); display:flex; justify-content:space-between;
}
.loading{text-align:center; padding:40px; color:var(--pine);}
.inline-form{display:flex; gap:8px; flex-wrap:wrap; align-items:flex-end; margin-top:10px;}
.inline-form > div{flex:1; min-width:100px;}
select#studentSelect option:disabled{color:#999;}
.helper{font-size:15.5px; color:#8a7f5f; margin-top:6px;}

/* ---------- ログイン画面 ---------- */
.login-wrap{
  min-height:100vh;
  display:flex;
  align-items:center;
  justify-content:center;
  padding:20px;
}
.login-card{
  background:var(--paper);
  border:1px solid var(--line);
  border-radius:4px 4px 18px 18px;
  box-shadow:0 8px 24px var(--paper-shadow);
  max-width:380px;
  width:100%;
  overflow:hidden;
}
.login-card .login-header{
  background:var(--pine-deep);
  color:#F2ECDD;
  padding:26px 24px 20px;
  text-align:center;
}
.login-card .login-header .app-title{font-size:26px;}
.login-card .card-body{padding:24px;}
.login-card .field-label{margin-top:14px;}
.login-card .field-label:first-child{margin-top:0;}
.login-error{
  color:var(--danger);
  font-size:15px;
  margin-top:10px;
  min-height:1.2em;
}
.login-card button[type=submit]{
  width:100%;
  justify-content:center;
  margin-top:20px;
  padding:12px;
}