/* ============================================
   CSS Custom Properties
   ============================================ */
:root {
  --color-primary:       #2563EB;
  --color-primary-dark:  #1D4ED8;
  --color-primary-light: #EFF6FF;
  --color-danger:        #DC2626;
  --color-danger-light:  #FEF2F2;
  --color-success:       #16A34A;
  --color-success-light: #F0FDF4;
  --color-warning:       #D97706;
  --color-warning-light: #FFFBEB;

  --color-text:          #111827;
  --color-text-muted:    #6B7280;
  --color-border:        #E5E7EB;
  --color-bg:            #F9FAFB;
  --color-surface:       #FFFFFF;

  --font-sans: 'Noto Sans JP', 'Hiragino Kaku Gothic ProN', sans-serif;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  --shadow-sm: 0 1px 2px rgba(0,0,0,.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,.08);
  --shadow-lg: 0 8px 24px rgba(0,0,0,.1);

  --header-h: 60px;
}

/* ============================================
   Reset & Base
   ============================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  min-height: 100vh;
}
a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }

/* ============================================
   Layout
   ============================================ */
.page-wrapper {
  min-height: calc(100vh - var(--header-h) - 60px);
  padding-top: calc(var(--header-h) + 24px);
}
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
}
.container--narrow {
  max-width: 640px;
}

/* ============================================
   Header
   ============================================ */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--header-h);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  z-index: 100;
  box-shadow: var(--shadow-sm);
}
.header-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.site-logo {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-primary);
  white-space: nowrap;
  text-decoration: none;
}
.header-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-wrap: wrap;
}
.header-nav a {
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  font-size: .875rem;
  color: var(--color-text);
  transition: background .15s;
  text-decoration: none;
}
.header-nav a:hover { background: var(--color-primary-light); color: var(--color-primary); }
.logout-form { display: inline; }
.btn-logout {
  padding: 6px 12px;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: .875rem;
  cursor: pointer;
  color: var(--color-text-muted);
  transition: all .15s;
}
.btn-logout:hover { background: var(--color-danger-light); border-color: var(--color-danger); color: var(--color-danger); }

/* hamburger（デフォルト非表示） */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 28px; height: 20px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}
.hamburger span {
  display: block;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all .25s;
}

/* ============================================
   Footer
   ============================================ */
.site-footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: 20px 0;
  margin-top: 60px;
}
.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
  text-align: center;
}
.footer-copy { font-size: .8rem; color: var(--color-text-muted); }

/* ============================================
   Buttons
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 20px;
  border-radius: var(--radius-md);
  font-size: .9rem;
  font-weight: 600;
  cursor: pointer;
  border: 2px solid transparent;
  transition: all .15s;
  text-decoration: none;
  white-space: nowrap;
}
.btn--primary { background: var(--color-primary); color: #fff; border-color: var(--color-primary); }
.btn--primary:hover { background: var(--color-primary-dark); border-color: var(--color-primary-dark); text-decoration: none; color: #fff; }
.btn--outline { background: transparent; color: var(--color-primary); border-color: var(--color-primary); }
.btn--outline:hover { background: var(--color-primary-light); text-decoration: none; }
.btn--outline-sm { padding: 5px 12px; font-size: .8rem; background: transparent; color: var(--color-primary); border: 1.5px solid var(--color-primary); border-radius: var(--radius-sm); }
.btn--ghost { background: transparent; color: var(--color-text-muted); border-color: var(--color-border); }
.btn--ghost:hover { background: var(--color-bg); text-decoration: none; }
.btn--danger { background: var(--color-danger); color: #fff; border-color: var(--color-danger); }
.btn--danger:hover { background: #B91C1C; border-color: #B91C1C; text-decoration: none; color: #fff; }
.btn--danger-outline { background: transparent; color: var(--color-danger); border-color: var(--color-danger); }
.btn--danger-outline:hover { background: var(--color-danger-light); text-decoration: none; }
.btn--sm { padding: 5px 12px; font-size: .8rem; }
.btn--full { width: 100%; }

/* ============================================
   Forms
   ============================================ */
.form-group { margin-bottom: 20px; }
.form-group label {
  display: block;
  font-size: .875rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--color-text);
}
.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="password"],
.form-group input[type="tel"],
.form-group input[type="date"],
.form-group input[type="time"],
.form-group input[type="number"],
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 10px 14px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: .95rem;
  font-family: inherit;
  color: var(--color-text);
  background: var(--color-surface);
  transition: border-color .15s, box-shadow .15s;
  appearance: none;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(37,99,235,.15);
}
.form-group textarea { resize: vertical; min-height: 80px; }
.form-group--checkbox label { display: flex; align-items: center; gap: 8px; font-weight: 400; }
.form-group--checkbox input[type="checkbox"] { width: 18px; height: 18px; accent-color: var(--color-primary); }
.form-hint { font-size: .78rem; color: var(--color-text-muted); margin-top: 4px; display: block; }
.required { color: var(--color-danger); margin-left: 2px; }
.form-actions { display: flex; gap: 12px; justify-content: flex-end; margin-top: 8px; flex-wrap: wrap; }
.filter-form { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; margin-bottom: 20px; }
.filter-form select,
.filter-form input { padding: 7px 12px; border: 1.5px solid var(--color-border); border-radius: var(--radius-md); font-size: .875rem; }
.inline-form { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; margin-bottom: 20px; }
.inline-form input { padding: 7px 12px; border: 1.5px solid var(--color-border); border-radius: var(--radius-md); font-size: .875rem; }

/* ============================================
   Alerts
   ============================================ */
.alert {
  padding: 14px 18px;
  border-radius: var(--radius-md);
  margin-bottom: 20px;
  font-size: .9rem;
}
.alert ul { padding-left: 16px; list-style: disc; }
.alert--error { background: var(--color-danger-light); border: 1px solid #FECACA; color: #991B1B; }
.alert--success { background: var(--color-success-light); border: 1px solid #BBF7D0; color: #15803D; }

/* ============================================
   Auth Pages
   ============================================ */
.auth-main {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 40px 20px;
}
.auth-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: 40px;
  width: 100%;
  max-width: 440px;
}
.auth-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 28px;
  text-align: center;
}
.auth-link {
  text-align: center;
  margin-top: 20px;
  font-size: .875rem;
  color: var(--color-text-muted);
}

/* ============================================
   Page Title & Main
   ============================================ */
.main-content { padding-bottom: 40px; }
.page-title { font-size: 1.5rem; font-weight: 700; margin-bottom: 24px; }
.section-title { font-size: 1.1rem; font-weight: 700; margin-bottom: 16px; }
.welcome-msg { color: var(--color-text-muted); margin-bottom: 24px; }
.empty-msg { color: var(--color-text-muted); padding: 20px 0; }
.text-muted { color: var(--color-text-muted); font-size: .85rem; }
.cancel-warning { color: var(--color-danger); font-weight: 600; margin-bottom: 20px; }

/* ============================================
   Tables
   ============================================ */
.table-wrapper { overflow-x: auto; }
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: .9rem;
}
.data-table th,
.data-table td {
  padding: 12px 14px;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}
.data-table th { background: var(--color-bg); font-weight: 600; font-size: .8rem; text-transform: uppercase; letter-spacing: .04em; color: var(--color-text-muted); }
.data-table tbody tr:hover { background: var(--color-bg); }
.data-table td small { display: block; color: var(--color-text-muted); font-size: .78rem; }

/* ============================================
   Badges
   ============================================ */
.badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 99px;
  font-size: .75rem;
  font-weight: 600;
}
.badge--pending   { background: var(--color-warning-light); color: var(--color-warning); }
.badge--approved  { background: var(--color-success-light); color: var(--color-success); }
.badge--rejected  { background: #FEF2F2; color: var(--color-danger); }
.badge--cancelled { background: #F3F4F6; color: var(--color-text-muted); }

/* ============================================
   Dashboard - Stats
   ============================================ */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 32px;
}
.stat-card {
  background: var(--color-surface);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
}
.stat-card--alert { border-color: var(--color-warning); background: var(--color-warning-light); }
.stat-card__value { font-size: 2rem; font-weight: 700; color: var(--color-primary); }
.stat-card--alert .stat-card__value { color: var(--color-warning); }
.stat-card__label { font-size: .8rem; color: var(--color-text-muted); margin-top: 4px; }

/* ============================================
   Dashboard - Actions
   ============================================ */
.dashboard-actions {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 16px;
  margin-bottom: 32px;
}
.card-action {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding: 24px 16px;
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: all .15s;
  text-decoration: none;
  color: var(--color-text);
}
.card-action:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  text-decoration: none;
}
.card-action__icon { font-size: 2rem; }
.card-action__label { font-size: .875rem; font-weight: 600; }

/* ============================================
   Reservation Cards (User)
   ============================================ */
.reservation-cards { display: grid; gap: 12px; }
.reservation-card {
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  display: grid;
  grid-template-columns: auto 1fr auto auto;
  gap: 8px 16px;
  align-items: center;
}
.reservation-card__date { font-weight: 700; white-space: nowrap; }
.reservation-card__menu { color: var(--color-text-muted); font-size: .875rem; }
.reservation-card__staff { font-size: .8rem; color: var(--color-text-muted); grid-column: 2; }
.reservation-card__status { text-align: right; }
.reservation-card__actions { display: flex; gap: 8px; grid-column: span 1; }

/* ============================================
   Info Card
   ============================================ */
.info-card {
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  margin-bottom: 24px;
}
.info-list { display: grid; grid-template-columns: auto 1fr; gap: 8px 16px; }
.info-list dt { font-weight: 600; font-size: .875rem; color: var(--color-text-muted); }
.info-list dd { font-size: .9rem; }

/* ============================================
   Admin Layout
   ============================================ */
.admin-layout {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 24px;
  align-items: flex-start;
}
.admin-form-panel {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-sm);
}
.admin-table-panel { overflow: hidden; }
.panel-title { font-size: 1rem; font-weight: 700; margin-bottom: 20px; }
.admin-section { margin-bottom: 40px; }
.section-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; }
.dashboard-section { margin-top: 32px; }

/* ============================================
   Reservation Form
   ============================================ */
.reservation-form {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-sm);
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 768px) {
  .hamburger { display: flex; }

  .header-nav {
    display: none;
    position: fixed;
    top: var(--header-h);
    left: 0; right: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    align-items: stretch;
    padding: 12px;
    gap: 4px;
    z-index: 99;
    box-shadow: var(--shadow-md);
  }
  .header-nav.is-open { display: flex; }
  .header-nav a, .btn-logout {
    padding: 12px 16px;
    font-size: 1rem;
  }
  .logout-form { display: block; }

  .stats-grid { grid-template-columns: repeat(2, 1fr); }

  .admin-layout { grid-template-columns: 1fr; }

  .reservation-card {
    grid-template-columns: 1fr;
  }
  .reservation-card__status { text-align: left; }
  .reservation-card__staff { grid-column: 1; }

  /* レスポンシブテーブル */
  .data-table thead { display: none; }
  .data-table tbody tr {
    display: block;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    margin-bottom: 12px;
    padding: 12px;
  }
  .data-table tbody td {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 6px 0;
    border-bottom: none;
    gap: 12px;
  }
  .data-table tbody td::before {
    content: attr(data-label);
    font-weight: 600;
    font-size: .8rem;
    color: var(--color-text-muted);
    white-space: nowrap;
  }

  .auth-card { padding: 28px 20px; }
}

@media (max-width: 480px) {
  .stats-grid { grid-template-columns: 1fr; }
  .form-actions { flex-direction: column; }
  .form-actions .btn { width: 100%; }
}