/* ===================================
   IT塾 aitusg.jp 予約システム スタイル
   =================================== */

:root {
  --primary-color: #2563eb;
  --primary-hover: #1d4ed8;
  --secondary-color: #64748b;
  --success-color: #10b981;
  --warning-color: #f59e0b;
  --danger-color: #ef4444;
  --background-color: #f8fafc;
  --card-background: #ffffff;
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --border-color: #e2e8f0;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

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

body {
  font-family: 'Noto Sans JP', 'Hiragino Sans', 'Hiragino Kaku Gothic ProN', Meiryo, sans-serif;
  background-color: var(--background-color);
  color: var(--text-primary);
  line-height: 1.6;
}

/* ヘッダー */
.header {
  background: linear-gradient(135deg, var(--primary-color), #3b82f6);
  color: white;
  padding: 1.5rem 2rem;
  box-shadow: var(--shadow);
}

.header h1 {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.header p {
  opacity: 0.9;
  font-size: 0.95rem;
}

.header-nav {
  display: flex;
  gap: 1rem;
  margin-top: 1rem;
}

.header-nav a {
  color: white;
  text-decoration: none;
  padding: 0.5rem 1rem;
  border-radius: 6px;
  background: rgba(255,255,255,0.15);
  transition: background 0.2s;
}

.header-nav a:hover {
  background: rgba(255,255,255,0.25);
}

/* メインコンテナ */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

/* カード */
.card {
  background: var(--card-background);
  border-radius: 12px;
  box-shadow: var(--shadow);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-color);
}

.card-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
}

/* カレンダー */
.calendar-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

@media (max-width: 900px) {
  .calendar-container {
    grid-template-columns: 1fr;
  }
}

.calendar {
  background: var(--card-background);
  border-radius: 12px;
  box-shadow: var(--shadow);
  overflow: hidden;
}

.calendar-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.5rem;
  background: var(--primary-color);
  color: white;
}

.calendar-header h3 {
  font-size: 1.1rem;
}

.calendar-nav {
  display: flex;
  gap: 0.5rem;
}

.calendar-nav button {
  background: rgba(255,255,255,0.2);
  border: none;
  color: white;
  width: 36px;
  height: 36px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 1.1rem;
  transition: background 0.2s;
}

.calendar-nav button:hover {
  background: rgba(255,255,255,0.3);
}

.calendar-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 2px;
  padding: 1rem;
}

.calendar-weekday {
  text-align: center;
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--text-secondary);
  padding: 0.5rem;
}

.calendar-day {
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.95rem;
  transition: all 0.2s;
  position: relative;
}

.calendar-day:hover:not(.disabled):not(.other-month) {
  background: #e0e7ff;
}

.calendar-day.selected {
  background: var(--primary-color);
  color: white;
  font-weight: 600;
}

.calendar-day.today {
  border: 2px solid var(--primary-color);
}

.calendar-day.disabled {
  color: #cbd5e1;
  cursor: not-allowed;
}

.calendar-day.other-month {
  color: #cbd5e1;
}

.calendar-day.has-slots::after {
  content: '';
  position: absolute;
  bottom: 4px;
  width: 6px;
  height: 6px;
  background: var(--success-color);
  border-radius: 50%;
}

.calendar-day.sunday {
  color: var(--danger-color);
}

.calendar-day.saturday {
  color: var(--primary-color);
}

/* 時間スロット */
.time-slots {
  background: var(--card-background);
  border-radius: 12px;
  box-shadow: var(--shadow);
  padding: 1.5rem;
}

.time-slots h3 {
  font-size: 1.1rem;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.selected-date-display {
  background: #f1f5f9;
  padding: 0.75rem 1rem;
  border-radius: 8px;
  margin-bottom: 1rem;
  font-weight: 500;
}

.slots-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.slot-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem;
  border: 2px solid var(--border-color);
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.2s;
}

.slot-item:hover:not(.unavailable) {
  border-color: var(--primary-color);
  background: #f8faff;
}

.slot-item.selected {
  border-color: var(--primary-color);
  background: #eff6ff;
}

.slot-item.unavailable {
  background: #f8f8f8;
  cursor: not-allowed;
  opacity: 0.6;
}

.slot-time {
  font-weight: 600;
  font-size: 1rem;
}

.slot-status {
  font-size: 0.85rem;
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
}

.slot-status.available {
  background: #d1fae5;
  color: #065f46;
}

.slot-status.limited {
  background: #fef3c7;
  color: #92400e;
}

.slot-status.full {
  background: #fee2e2;
  color: #991b1b;
}

/* フォーム */
.reservation-form {
  background: var(--card-background);
  border-radius: 12px;
  box-shadow: var(--shadow);
  padding: 2rem;
  margin-top: 2rem;
}

.form-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-color);
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  font-weight: 500;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.form-group label .required {
  color: var(--danger-color);
  margin-left: 0.25rem;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 2px solid var(--border-color);
  border-radius: 8px;
  font-size: 1rem;
  transition: border-color 0.2s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary-color);
}

.form-group input.error {
  border-color: var(--danger-color);
}

.form-group .error-message {
  color: var(--danger-color);
  font-size: 0.85rem;
  margin-top: 0.25rem;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

@media (max-width: 600px) {
  .form-row {
    grid-template-columns: 1fr;
  }
}

/* ボタン */
.btn {
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.btn-primary {
  background: var(--primary-color);
  color: white;
}

.btn-primary:hover {
  background: var(--primary-hover);
}

.btn-primary:disabled {
  background: #94a3b8;
  cursor: not-allowed;
}

.btn-success {
  background: var(--success-color);
  color: white;
}

.btn-success:hover {
  background: #059669;
}

.btn-danger {
  background: var(--danger-color);
  color: white;
}

.btn-danger:hover {
  background: #dc2626;
}

.btn-secondary {
  background: var(--secondary-color);
  color: white;
}

.btn-secondary:hover {
  background: #475569;
}

.btn-outline {
  background: transparent;
  border: 2px solid var(--border-color);
  color: var(--text-primary);
}

.btn-outline:hover {
  border-color: var(--primary-color);
  color: var(--primary-color);
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
}

.btn-lg {
  padding: 1rem 2rem;
  font-size: 1.1rem;
}

.btn-block {
  width: 100%;
}

/* 予約確認 */
.reservation-summary {
  background: #f8fafc;
  border-radius: 10px;
  padding: 1.25rem;
  margin-bottom: 1.5rem;
}

.summary-row {
  display: flex;
  justify-content: space-between;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--border-color);
}

.summary-row:last-child {
  border-bottom: none;
}

.summary-label {
  color: var(--text-secondary);
}

.summary-value {
  font-weight: 500;
}

/* ステータスバッジ */
.badge {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 500;
}

.badge-pending {
  background: #fef3c7;
  color: #92400e;
}

.badge-approved {
  background: #d1fae5;
  color: #065f46;
}

.badge-rejected {
  background: #fee2e2;
  color: #991b1b;
}

.badge-cancelled {
  background: #e2e8f0;
  color: #475569;
}

/* 管理者ページ テーブル */
.admin-table {
  width: 100%;
  border-collapse: collapse;
}

.admin-table th,
.admin-table td {
  padding: 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

.admin-table th {
  background: #f8fafc;
  font-weight: 600;
  color: var(--text-secondary);
  font-size: 0.85rem;
  text-transform: uppercase;
}

.admin-table tr:hover {
  background: #fafafa;
}

.admin-table .actions {
  display: flex;
  gap: 0.5rem;
}

/* 統計カード */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-bottom: 2rem;
}

@media (max-width: 900px) {
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 500px) {
  .stats-grid {
    grid-template-columns: 1fr;
  }
}

.stat-card {
  background: var(--card-background);
  border-radius: 12px;
  box-shadow: var(--shadow);
  padding: 1.25rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.stat-icon {
  width: 50px;
  height: 50px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
}

.stat-icon.blue {
  background: #dbeafe;
  color: var(--primary-color);
}

.stat-icon.yellow {
  background: #fef3c7;
  color: var(--warning-color);
}

.stat-icon.green {
  background: #d1fae5;
  color: var(--success-color);
}

.stat-icon.red {
  background: #fee2e2;
  color: var(--danger-color);
}

.stat-info h4 {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.stat-info p {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-primary);
}

/* モーダル */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s;
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: var(--card-background);
  border-radius: 16px;
  box-shadow: var(--shadow-lg);
  max-width: 500px;
  width: 90%;
  max-height: 90vh;
  overflow-y: auto;
  transform: translateY(-20px);
  transition: transform 0.3s;
}

.modal-overlay.active .modal {
  transform: translateY(0);
}

.modal-header {
  padding: 1.5rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-header h3 {
  font-size: 1.25rem;
  font-weight: 600;
}

.modal-close {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-secondary);
  transition: color 0.2s;
}

.modal-close:hover {
  color: var(--text-primary);
}

.modal-body {
  padding: 1.5rem;
}

.modal-footer {
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
}

/* アラート */
.alert {
  padding: 1rem 1.25rem;
  border-radius: 10px;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.alert-success {
  background: #d1fae5;
  color: #065f46;
  border: 1px solid #a7f3d0;
}

.alert-warning {
  background: #fef3c7;
  color: #92400e;
  border: 1px solid #fde68a;
}

.alert-error {
  background: #fee2e2;
  color: #991b1b;
  border: 1px solid #fecaca;
}

.alert-info {
  background: #dbeafe;
  color: #1e40af;
  border: 1px solid #bfdbfe;
}

/* フィルター */
.filters {
  display: flex;
  gap: 1rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.filter-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.filter-group label {
  font-weight: 500;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.filter-group select {
  padding: 0.5rem 1rem;
  border: 2px solid var(--border-color);
  border-radius: 8px;
  font-size: 0.9rem;
}

/* タブ */
.tabs {
  display: flex;
  border-bottom: 2px solid var(--border-color);
  margin-bottom: 1.5rem;
}

.tab {
  padding: 1rem 1.5rem;
  background: none;
  border: none;
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  position: relative;
  transition: color 0.2s;
}

.tab:hover {
  color: var(--primary-color);
}

.tab.active {
  color: var(--primary-color);
}

.tab.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--primary-color);
}

/* 予約詳細 */
.reservation-detail {
  display: grid;
  gap: 1rem;
}

.detail-row {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 1rem;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--border-color);
}

.detail-row:last-child {
  border-bottom: none;
}

.detail-label {
  font-weight: 500;
  color: var(--text-secondary);
}

.detail-value {
  color: var(--text-primary);
}

/* レスポンシブ対応 */
@media (max-width: 768px) {
  .header {
    padding: 1rem;
  }
  
  .header h1 {
    font-size: 1.35rem;
  }
  
  .container {
    padding: 1rem;
  }
  
  .admin-table {
    display: block;
    overflow-x: auto;
  }
  
  .modal {
    width: 95%;
    margin: 1rem;
  }
}

/* アニメーション */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  animation: fadeIn 0.3s ease-out;
}

/* ローディング */
.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 3rem;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--border-color);
  border-top-color: var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* 空状態 */
.empty-state {
  text-align: center;
  padding: 3rem;
  color: var(--text-secondary);
}

.empty-state svg {
  width: 80px;
  height: 80px;
  margin-bottom: 1rem;
  opacity: 0.5;
}

.empty-state h4 {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

/* ログイン */
.login-container {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.login-card {
  background: white;
  border-radius: 16px;
  box-shadow: var(--shadow-lg);
  padding: 2.5rem;
  width: 100%;
  max-width: 400px;
}

.login-card h2 {
  text-align: center;
  margin-bottom: 0.5rem;
}

.login-card p {
  text-align: center;
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

/* Zoom URL入力 */
.zoom-input-group {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.5rem;
}

.zoom-input-group input {
  flex: 1;
  padding: 0.5rem 0.75rem;
  border: 2px solid var(--border-color);
  border-radius: 6px;
  font-size: 0.9rem;
}

.zoom-input-group button {
  padding: 0.5rem 1rem;
}

/* 予約完了ページ */
.completion-container {
  max-width: 600px;
  margin: 3rem auto;
  text-align: center;
}

.completion-icon {
  width: 100px;
  height: 100px;
  background: #d1fae5;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.5rem;
  font-size: 3rem;
}

.completion-title {
  font-size: 1.75rem;
  margin-bottom: 0.75rem;
}

.completion-message {
  color: var(--text-secondary);
  margin-bottom: 2rem;
  line-height: 1.8;
}