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

:root {
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --danger: #dc2626;
  --danger-hover: #b91c1c;
  --success: #16a34a;
  --warning: #d97706;
  --bg: #f1f5f9;
  --card: #ffffff;
  --text: #1e293b;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(0,0,0,.08), 0 4px 16px rgba(0,0,0,.06);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.5;
}

/* ── 共通コンポーネント ── */
.card {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 2rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .4rem;
  border: none;
  border-radius: 8px;
  padding: .6rem 1.2rem;
  font-size: .9rem;
  font-weight: 600;
  cursor: pointer;
  transition: background .15s, opacity .15s;
}
.btn:disabled { opacity: .5; cursor: not-allowed; }

.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover:not(:disabled) { background: var(--primary-hover); }

.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover:not(:disabled) { background: var(--danger-hover); }

.btn-ghost {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border);
}
.btn-ghost:hover:not(:disabled) { background: var(--bg); }

.form-group { margin-bottom: 1rem; }
.form-group label {
  display: block;
  font-size: .85rem;
  font-weight: 600;
  margin-bottom: .35rem;
  color: var(--text-muted);
}
.form-group input,
.form-group select {
  width: 100%;
  padding: .6rem .8rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: .95rem;
  outline: none;
  transition: border-color .15s;
}
.form-group input:focus,
.form-group select:focus {
  border-color: var(--primary);
}

.alert {
  padding: .75rem 1rem;
  border-radius: 8px;
  font-size: .9rem;
  margin-bottom: 1rem;
}
.alert-error { background: #fef2f2; color: var(--danger); border: 1px solid #fecaca; }
.alert-success { background: #f0fdf4; color: var(--success); border: 1px solid #bbf7d0; }

/* ── ナビゲーション ── */
.nav {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}
.nav-brand {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text);
  text-decoration: none;
}
.nav-user {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: .9rem;
  color: var(--text-muted);
}

/* ── ログインページ ── */
.login-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 1rem;
}
.login-card {
  width: 100%;
  max-width: 380px;
}
.login-card h1 {
  font-size: 1.4rem;
  margin-bottom: .25rem;
}
.login-card .subtitle {
  color: var(--text-muted);
  font-size: .9rem;
  margin-bottom: 1.5rem;
}

/* ── ダッシュボード（解錠ページ）── */
.dashboard-page {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - 56px);
  padding: 2rem 1rem;
}

.unlock-card {
  width: 100%;
  max-width: 400px;
  text-align: center;
}
.unlock-card h2 {
  font-size: 1.3rem;
  margin-bottom: .5rem;
}
.unlock-card .desc {
  color: var(--text-muted);
  font-size: .9rem;
  margin-bottom: 2rem;
}

.unlock-btn {
  width: 180px;
  height: 180px;
  border-radius: 50%;
  border: none;
  background: linear-gradient(135deg, var(--primary), #60a5fa);
  color: white;
  font-size: 1.1rem;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 8px 32px rgba(37,99,235,.35);
  transition: transform .15s, box-shadow .15s, opacity .15s;
  margin-bottom: 1.5rem;
}
.unlock-btn:hover:not(:disabled) {
  transform: scale(1.05);
  box-shadow: 0 12px 40px rgba(37,99,235,.45);
}
.unlock-btn:active:not(:disabled) {
  transform: scale(.97);
}
.unlock-btn:disabled { opacity: .6; cursor: not-allowed; }

.unlock-status {
  min-height: 2rem;
  font-size: .95rem;
  font-weight: 500;
}

/* ── 管理画面 ── */
.admin-page {
  max-width: 900px;
  margin: 0 auto;
  padding: 2rem 1rem;
}
.admin-page h1 {
  font-size: 1.4rem;
  margin-bottom: 1.5rem;
}

.tabs {
  display: flex;
  gap: .5rem;
  margin-bottom: 1.5rem;
  border-bottom: 2px solid var(--border);
  padding-bottom: .5rem;
}
.tab-btn {
  background: none;
  border: none;
  font-size: .95rem;
  font-weight: 600;
  padding: .4rem .8rem;
  cursor: pointer;
  color: var(--text-muted);
  border-radius: 6px 6px 0 0;
  transition: color .15s, background .15s;
}
.tab-btn.active {
  color: var(--primary);
  background: #eff6ff;
}

.tab-panel { display: none; }
.tab-panel.active { display: block; }

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}
.section-header h2 { font-size: 1.1rem; }

table {
  width: 100%;
  border-collapse: collapse;
  font-size: .9rem;
}
th, td {
  text-align: left;
  padding: .6rem .8rem;
  border-bottom: 1px solid var(--border);
}
th { font-weight: 600; color: var(--text-muted); font-size: .8rem; text-transform: uppercase; }
tr:last-child td { border-bottom: none; }

.badge {
  display: inline-block;
  padding: .2rem .55rem;
  border-radius: 99px;
  font-size: .75rem;
  font-weight: 600;
}
.badge-admin { background: #eff6ff; color: var(--primary); }
.badge-staff { background: #f8fafc; color: var(--text-muted); }
.badge-success { background: #f0fdf4; color: var(--success); }
.badge-error { background: #fef2f2; color: var(--danger); }
.badge-denied { background: #fffbeb; color: var(--warning); }

/* モーダル */
.modal-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.4);
  z-index: 100;
  align-items: center;
  justify-content: center;
}
.modal-backdrop.open { display: flex; }
.modal {
  background: var(--card);
  border-radius: var(--radius);
  padding: 1.5rem;
  width: 100%;
  max-width: 420px;
  box-shadow: var(--shadow);
}
.modal h3 { font-size: 1.1rem; margin-bottom: 1rem; }
.modal-footer {
  display: flex;
  gap: .5rem;
  justify-content: flex-end;
  margin-top: 1.2rem;
}

@media (max-width: 600px) {
  .card, .modal { padding: 1.2rem; }
  .admin-page { padding: 1rem .75rem; }
  table { font-size: .8rem; }
}