*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}

:root{
  --slate-50:#f8fafc;--slate-100:#f1f5f9;--slate-200:#e2e8f0;--slate-300:#cbd5e1;
  --slate-400:#94a3b8;--slate-500:#64748b;--slate-600:#475569;--slate-700:#334155;
  --slate-800:#1e293b;--slate-900:#0f172a;
  --blue-50:#eff6ff;--blue-100:#dbeafe;--blue-500:#3b82f6;--blue-600:#2563eb;--blue-700:#1d4ed8;
  --green-50:#f0fdf4;--green-500:#22c55e;--green-600:#16a34a;--green-700:#15803d;
  --amber-50:#fffbeb;--amber-500:#f59e0b;--amber-700:#b45309;
  --red-50:#fef2f2;--red-500:#ef4444;--red-600:#dc2626;
  --ring:0 0 0 3px rgba(59,130,246,.25);
  --shadow-sm:0 1px 2px rgba(0,0,0,.05);
  --shadow:0 1px 3px rgba(0,0,0,.1),0 1px 2px rgba(0,0,0,.06);
  --shadow-md:0 4px 6px -1px rgba(0,0,0,.1),0 2px 4px -2px rgba(0,0,0,.1);
  --shadow-lg:0 10px 15px -3px rgba(0,0,0,.1),0 4px 6px -4px rgba(0,0,0,.1);
}

body{
  font-family:Inter,-apple-system,BlinkMacSystemFont,'Segoe UI','Noto Sans JP',sans-serif;
  background:var(--slate-50);color:var(--slate-800);
  line-height:1.5;font-size:14px;-webkit-font-smoothing:antialiased;
}

/* ── Header ── */
.header{background:var(--slate-900);color:#fff;padding:16px 24px}
.header h1{font-size:17px;font-weight:600;letter-spacing:-.01em}
.header .subtitle{font-size:13px;color:var(--slate-400);margin-top:2px}

/* ── Tabs ── */
.tabs{display:flex;background:#fff;border-bottom:1px solid var(--slate-200);overflow-x:auto;gap:0}
.tab{
  padding:11px 20px;cursor:pointer;border:none;background:none;
  font-size:13px;font-weight:500;color:var(--slate-500);
  border-bottom:2px solid transparent;transition:all .15s;white-space:nowrap;font-family:inherit;
}
.tab:hover{color:var(--slate-700)}
.tab.active{color:var(--blue-600);border-bottom-color:var(--blue-600)}

.sub-tabs{display:flex;gap:6px;margin-bottom:16px}
.sub-tab{
  padding:6px 14px;cursor:pointer;border:1px solid var(--slate-200);
  background:#fff;border-radius:9999px;font-size:13px;font-weight:500;
  color:var(--slate-500);transition:all .15s;font-family:inherit;
}
.sub-tab:hover{border-color:var(--slate-300);color:var(--slate-700)}
.sub-tab.active{background:var(--slate-800);color:#fff;border-color:var(--slate-800)}

/* ── Content ── */
.content{padding:20px 24px;max-width:1280px;margin:0 auto}

/* ── Card ── */
.card{
  background:#fff;border-radius:10px;border:1px solid var(--slate-200);
  padding:20px;margin-bottom:16px;box-shadow:var(--shadow-sm);
}
.card-title{font-size:15px;font-weight:600;color:var(--slate-800);margin-bottom:16px}
.card-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px}
.card-header .card-title{margin-bottom:0}
.student-actions{display:flex;gap:8px;align-items:center;flex-wrap:wrap;justify-content:flex-end}

/* ── Table ── */
.table-wrapper{
  overflow:auto;border-radius:8px;border:1px solid var(--slate-200);
  max-width:100%;-webkit-overflow-scrolling:touch;
}
table{width:100%;min-width:920px;border-collapse:collapse}
th,td{padding:9px 14px;text-align:left;font-size:13px;vertical-align:middle}
th{
  font-weight:600;color:var(--slate-500);font-size:11px;text-transform:uppercase;
  letter-spacing:.05em;background:var(--slate-50);border-bottom:1px solid var(--slate-200);
  position:sticky;top:0;z-index:1;white-space:nowrap;
}
td{border-bottom:1px solid var(--slate-100);overflow:hidden}
td.actions-cell{white-space:nowrap}
td.empty-row{text-align:center;color:var(--slate-400);padding:28px 14px}
tbody tr:hover{background:var(--blue-50)}
tbody tr:last-child td{border-bottom:none}
tbody tr.is-canceled{background:var(--slate-50);color:var(--slate-500)}
tbody tr.is-canceled:hover{background:var(--slate-100)}
.history-table{min-width:2384px;table-layout:fixed}
.history-table th,.history-table td{padding:8px 10px}
.history-table th:nth-child(1),.history-table td:nth-child(1){
  position:sticky;left:0;z-index:2;background:#fff;
}
.history-table th:nth-child(2),.history-table td:nth-child(2){
  position:sticky;left:72px;z-index:2;background:#fff;box-shadow:1px 0 0 var(--slate-100);
}
.history-table th:nth-child(1),.history-table th:nth-child(2){z-index:4;background:var(--slate-50)}
.history-table tbody tr:hover td:nth-child(1),.history-table tbody tr:hover td:nth-child(2){background:var(--blue-50)}
.history-table tbody tr.is-canceled td:nth-child(1),.history-table tbody tr.is-canceled td:nth-child(2){background:var(--slate-50)}
.table-cell{
  display:block;line-height:1.45;overflow:hidden;overflow-wrap:break-word;word-break:normal;
}
.cell-nowrap{white-space:nowrap;text-overflow:ellipsis}
.cell-clamp{
  display:-webkit-box;-webkit-box-orient:vertical;
}
.cell-2{-webkit-line-clamp:2}
.cell-3{-webkit-line-clamp:3}
.history-table .badge{white-space:nowrap}
.history-table .badge-activity{margin:2px 2px 2px 0}
.history-table .actions-cell{text-align:center}
.student-history-detail-table table{min-width:1180px;table-layout:fixed}

/* ── Forms ── */
.form-group{margin-bottom:14px}
.form-row{display:flex;gap:14px}
.flex-1{flex:1}.flex-2{flex:2}

label{display:block;font-size:12px;font-weight:600;color:var(--slate-600);margin-bottom:4px;text-transform:uppercase;letter-spacing:.03em}

input[type="text"],input[type="email"],input[type="date"],input[type="url"],select,textarea{
  width:100%;padding:8px 12px;border:1px solid var(--slate-300);border-radius:8px;
  font-size:14px;font-family:inherit;color:var(--slate-800);background:#fff;
  transition:border-color .15s,box-shadow .15s;
}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--blue-500);box-shadow:var(--ring)}
input::placeholder,textarea::placeholder{color:var(--slate-400)}
.readonly-field{
  width:100%;padding:8px 12px;border:1px solid var(--slate-200);border-radius:8px;
  font-size:14px;color:var(--slate-700);background:var(--slate-50);min-height:37px;
  display:flex;align-items:center;
}
.readonly-field:empty::before{content:"未記録";color:var(--slate-400)}

/* ── Buttons ── */
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  padding:8px 18px;border:none;border-radius:8px;font-size:13px;font-weight:500;
  font-family:inherit;cursor:pointer;transition:all .15s;
}
.btn:disabled{opacity:.4;cursor:not-allowed}
.btn-primary{background:var(--blue-600);color:#fff;box-shadow:var(--shadow-sm)}
.btn-primary:hover:not(:disabled){background:var(--blue-700)}
.btn-secondary{background:#fff;border:1px solid var(--slate-300);color:var(--slate-700)}
.btn-secondary:hover:not(:disabled){background:var(--slate-50);border-color:var(--slate-400)}
.btn-sm{padding:5px 12px;font-size:12px;border-radius:6px}

.btn-icon{
  background:none;border:none;cursor:pointer;padding:4px 6px;border-radius:6px;
  font-size:15px;color:var(--slate-400);transition:all .15s;line-height:1;
}
.btn-icon:disabled{opacity:.28;cursor:not-allowed}
.btn-icon:hover{background:var(--slate-100);color:var(--slate-600)}
.btn-icon:disabled:hover{background:none;color:var(--slate-400)}
.btn-icon.warning{font-size:11px;font-weight:700;color:var(--amber-700)}
.btn-icon.warning:hover{background:var(--amber-50);color:var(--amber-700)}
.btn-icon.danger:hover{background:var(--red-50);color:var(--red-500)}
.link-button{
  border:none;background:transparent;padding:0;color:var(--blue-700);font:inherit;
  cursor:pointer;text-align:left;font-weight:600;
}
.link-button:hover{text-decoration:underline}

/* ── Filters ── */
.filters{display:flex;gap:10px;margin-bottom:14px;flex-wrap:wrap;align-items:center}
.filters select,.filters input[type="text"]{width:auto;min-width:140px}

.checkbox-label{display:flex;align-items:center;gap:6px;font-size:13px;cursor:pointer;color:var(--slate-500);font-weight:500}
.checkbox-label input[type="checkbox"]{width:auto}

/* ── Checkbox List ── */
.checkbox-list{max-height:320px;overflow-y:auto;border:1px solid var(--slate-200);border-radius:8px}
.checkbox-item{display:flex;align-items:center;padding:7px 12px;border-bottom:1px solid var(--slate-100);font-size:13px}
.checkbox-item:last-child{border-bottom:none}
.checkbox-item:hover{background:var(--slate-50)}
.checkbox-item.is-selected{background:var(--blue-50)}
.checkbox-item.is-registered{background:var(--slate-50);color:var(--slate-500)}
.checkbox-item input[type="checkbox"]{width:auto;margin-right:10px;accent-color:var(--blue-600)}
.checkbox-item .class-tag{font-size:11px;font-weight:600;color:var(--slate-400);margin-right:8px;min-width:36px}
.checkbox-item .club-tag{
  margin-left:auto;padding-left:8px;color:var(--slate-500);font-size:12px;text-align:right;
  max-width:42%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;
}
.tag-checkbox-list{display:flex;flex-wrap:wrap;gap:8px}
.tag-checkbox-list .checkbox-label{
  border:1px solid var(--slate-200);border-radius:6px;padding:6px 10px;background:#fff;margin-bottom:0;
  text-transform:none;letter-spacing:0;color:var(--slate-700);
}
.tag-checkbox-list .checkbox-label:hover{background:var(--slate-50);border-color:var(--slate-300)}
.selection-panel{
  position:sticky;top:0;z-index:2;display:flex;flex-wrap:wrap;gap:6px;align-items:center;
  min-height:38px;margin-bottom:8px;padding:8px;border:1px solid var(--slate-200);
  border-radius:8px;background:#fff;box-shadow:0 1px 0 rgba(15,23,42,.04);
}
.selection-panel.is-empty{color:var(--slate-400);font-size:12px}
.selection-count{font-size:12px;font-weight:700;color:var(--slate-700);margin-right:4px}
.selection-chip{
  display:inline-flex;align-items:center;gap:5px;padding:4px 8px;border-radius:6px;
  background:var(--blue-50);color:var(--blue-700);font-size:12px;font-weight:600;
}
.selection-chip button{
  border:none;background:transparent;color:var(--blue-700);cursor:pointer;padding:0;font-size:13px;line-height:1;
}

/* ── Badge ── */
.badge{display:inline-flex;align-items:center;padding:2px 8px;border-radius:6px;font-size:11px;font-weight:600;letter-spacing:.02em}
.badge-club{background:#f5f3ff;color:#6d28d9}
.badge-ssh{background:var(--blue-50);color:var(--blue-700)}
.badge-council{background:var(--green-50);color:var(--green-700)}
.badge-career{background:var(--amber-50);color:var(--amber-700)}
.badge-other{background:var(--slate-100);color:var(--slate-600)}
.badge-activity{background:var(--slate-100);color:var(--slate-700);margin:1px 2px 1px 0}
.badge-active{background:var(--green-50);color:var(--green-700)}
.badge-canceled{background:var(--red-50);color:var(--red-600)}

/* ── Links ── */
a{color:var(--blue-600);text-decoration:none;font-weight:500}
a:hover{text-decoration:underline;color:var(--blue-700)}
.link-sm{font-size:12px}

/* ── 要録 ── */
.youroku-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px;margin-top:20px}
.youroku-output{
  background:var(--amber-50);border:1px solid #fde68a;border-radius:10px;
  padding:20px 24px;font-size:14px;line-height:2.2;white-space:pre-line;
  color:var(--slate-800);
}

/* ── Count Mode ── */
.count-cell{text-align:center;min-width:48px;font-variant-numeric:tabular-nums}
.count-total{font-weight:600;background:var(--slate-50)}

/* ── Info / Empty ── */
.info-text{font-size:13px;color:var(--slate-500);margin-top:10px}
.empty-message{text-align:center;padding:48px 24px;color:var(--slate-400);font-size:14px}

/* ── Loading ── */
#loading{display:flex;flex-direction:column;align-items:center;justify-content:center;height:80vh;color:var(--slate-400)}
.spinner{
  width:32px;height:32px;border:3px solid var(--slate-200);border-top-color:var(--blue-500);
  border-radius:50%;animation:spin .6s linear infinite;margin-bottom:16px;
}
@keyframes spin{to{transform:rotate(360deg)}}

/* ── Error ── */
.error-container{max-width:720px;margin:56px auto;text-align:left;padding:32px;background:#fff;border:1px solid var(--slate-200);border-radius:10px;box-shadow:var(--shadow-sm)}
.error-container h2{color:var(--red-500);font-size:18px;font-weight:600;margin-bottom:8px}
.error-container p{color:var(--slate-500)}
.error-email{margin-top:10px;padding:10px 12px;background:var(--slate-50);border:1px solid var(--slate-200);border-radius:8px;color:var(--slate-700)!important;font-weight:600;word-break:break-all}
.error-help{margin-top:18px}
.error-help h3{font-size:15px;color:var(--slate-800);margin-bottom:8px}
.error-help ol{padding-left:22px;color:var(--slate-600)}
.error-help li{margin-bottom:8px}
.error-actions{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}

/* ── Modal ── */
.modal-overlay{
  position:fixed;top:0;left:0;width:100%;height:100%;
  background:rgba(15,23,42,.4);backdrop-filter:blur(4px);
  display:flex;align-items:center;justify-content:center;z-index:100;
}
.modal{
  background:#fff;border-radius:14px;padding:24px;width:92%;max-width:500px;
  max-height:85vh;overflow-y:auto;box-shadow:var(--shadow-lg);
}
.modal.modal-wide{max-width:980px}
.modal-title{font-size:17px;font-weight:600;color:var(--slate-900);margin-bottom:20px}
.modal-actions{display:flex;justify-content:flex-end;gap:8px;margin-top:20px}
.student-detail-summary{display:flex;gap:12px;align-items:center;flex-wrap:wrap;margin-bottom:12px}
.student-detail-summary span{font-size:12px;color:var(--slate-600);background:var(--slate-100);border-radius:6px;padding:3px 8px}
.student-history-detail-table{max-height:56vh;overflow:auto}
.muted-text{color:var(--slate-400);font-size:11px}

/* ── Toast ── */
.toast{
  position:fixed;bottom:24px;right:24px;padding:10px 20px;border-radius:10px;
  color:#fff;font-size:13px;font-weight:500;z-index:200;
  animation:slideUp .25s ease-out;box-shadow:var(--shadow-md);
}
.toast-success{background:var(--green-600)}
.toast-error{background:var(--red-500)}
@keyframes slideUp{from{transform:translateY(16px);opacity:0}to{transform:translateY(0);opacity:1}}

/* ── Responsive ── */
@media(max-width:768px){
  .content{padding:14px}
  .card{padding:14px}
  .filters{flex-direction:column}
  .filters select,.filters input[type="text"]{width:100%;min-width:auto}
  .form-row{flex-direction:column;gap:0}
  .card-header{align-items:flex-start;gap:12px;flex-direction:column}
  .student-actions{width:100%;justify-content:flex-start}
  .checkbox-item{flex-wrap:wrap}
  .checkbox-item .club-tag{margin-left:54px;max-width:calc(100% - 54px);text-align:left;padding-left:0}
  th,td{padding:7px 8px;font-size:12px}
  th{font-size:10px}
  .tab{padding:10px 14px;font-size:12px}
  .header{padding:14px 16px}
  .header h1{font-size:15px}
}

/* ── Scrollbar ── */
::-webkit-scrollbar{width:6px;height:6px}
::-webkit-scrollbar-track{background:transparent}
::-webkit-scrollbar-thumb{background:var(--slate-300);border-radius:3px}
::-webkit-scrollbar-thumb:hover{background:var(--slate-400)}