/* ==================== デザインシステム・ベース ==================== */
:root {
  --bg-color: #f8fafc;
  --panel-bg: #ffffff;
  --panel-border: #e2e8f0;
  --primary-gradient: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
  --accent-gradient: linear-gradient(135deg, #a78bfa 0%, #6d28d9 100%);
  --card-glow: rgba(59, 130, 246, 0.02);
  
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  
  --color-primary: #3b82f6;
  --color-accent: #8b5cf6;
  --color-success: #10b981;
  --color-danger: #ef4444;
  --color-warning: #f59e0b;
  
  --border-radius-sm: 10px;
  --border-radius-md: 18px;
  --border-radius-lg: 24px;
  
  --transition-speed: 0.3s;
  --sidebar-width: 260px;
  --mobile-nav-height: 65px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: 'Outfit', 'Noto Sans JP', sans-serif;
  background-color: var(--bg-color);
  background-image: radial-gradient(circle at 10% 15%, rgba(59, 130, 246, 0.02) 0%, transparent 40%),
                    radial-gradient(circle at 85% 80%, rgba(139, 92, 246, 0.03) 0%, transparent 45%);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* スクロールバーのカスタマイズ */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-track {
  background: var(--bg-color);
}
::-webkit-scrollbar-thumb {
  background: rgba(0, 0, 0, 0.08);
  border-radius: 10px;
}
::-webkit-scrollbar-thumb:hover {
  background: rgba(59, 130, 246, 0.25);
}

/* ==================== ユーティリティ・レイアウト ==================== */
.hidden {
  display: none !important;
}

.mt-4 { margin-top: 1.5rem !important; }
.mr-2 { margin-right: 0.5rem !important; }
.text-danger { color: var(--color-danger) !important; }
.text-success { color: var(--color-success) !important; }
.text-accent { color: var(--color-accent) !important; }
.text-small { font-size: 0.8rem; }
.font-small { font-size: 0.8rem; }
.max-w-md { max-width: 520px; margin: 0 auto; }
.span-2 { grid-column: span 2; }
.align-end { display: flex; align-items: flex-end; }

/* ==================== コンポーネント: ボタン ==================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: inherit;
  font-weight: 600;
  font-size: 0.9rem;
  padding: 0.7rem 1.4rem;
  border-radius: var(--border-radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-speed) cubic-bezier(0.4, 0, 0.2, 1);
  outline: none;
  letter-spacing: 0.02em;
}

.btn-primary {
  background: var(--primary-gradient);
  color: #ffffff;
  border: none;
  box-shadow: 0 4px 20px rgba(0, 240, 255, 0.22);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(59, 130, 246, 0.35);
  filter: brightness(1.1);
}
.btn-primary:active {
  transform: translateY(0);
}

.btn-accent {
  background: var(--accent-gradient);
  color: #ffffff;
  border: none;
  box-shadow: 0 4px 14px rgba(139, 92, 246, 0.25);
}
.btn-accent:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(139, 92, 246, 0.35);
  filter: brightness(1.1);
}
.btn-accent:active {
  transform: translateY(0);
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--panel-border);
  color: var(--text-primary);
}
.btn-outline:hover {
  background: #f1f5f9;
  border-color: var(--panel-border);
  transform: translateY(-1px);
}

.btn-text {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  padding: 0.3rem 0.6rem;
  font-weight: 500;
}
.btn-text:hover {
  color: var(--color-primary);
}

.btn-icon {
  background: rgba(0, 0, 0, 0.02);
  border: 1px solid var(--panel-border);
  font-size: 1.1rem;
  cursor: pointer;
  color: var(--text-primary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  transition: all 0.2s;
}
.btn-icon:hover {
  background: rgba(0, 0, 0, 0.05);
  border-color: var(--panel-border);
}

.btn-block {
  width: 100%;
}

.btn-sm {
  padding: 0.45rem 0.9rem;
  font-size: 0.8rem;
}

/* ==================== フォーム設計 ==================== */
.form-group {
  margin-bottom: 1.4rem;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.2rem;
}

label {
  display: block;
  font-size: 0.82rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text-secondary);
  letter-spacing: 0.02em;
}

input[type="text"],
input[type="password"],
input[type="number"],
input[type="date"],
input[type="month"],
select,
textarea {
  width: 100%;
  padding: 0.85rem 1.1rem;
  background-color: #f8fafc;
  border: 1px solid var(--panel-border);
  border-radius: var(--border-radius-sm);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.95rem;
  transition: all var(--transition-speed) ease;
  outline: none;
  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.02);
}

input:focus,
select:focus,
textarea:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
  background-color: #ffffff;
}

.help-text {
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: 0.35rem;
}

/* トグルグループ (支出/収入・個人/法人切り替え用) */
.toggle-group {
  display: flex;
  background-color: #f1f5f9;
  border: 1px solid var(--panel-border);
  border-radius: var(--border-radius-sm);
  padding: 3px;
}

.toggle-group input[type="radio"] {
  display: none;
}

.toggle-group label.toggle-btn {
  flex: 1;
  text-align: center;
  padding: 0.7rem;
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  border-radius: calc(var(--border-radius-sm) - 3px);
  margin-bottom: 0;
  color: var(--text-secondary);
  transition: all var(--transition-speed) ease;
}

.toggle-group input[type="radio"]:checked + label.toggle-btn {
  background: var(--primary-gradient);
  color: #ffffff;
  box-shadow: 0 2px 8px rgba(59, 130, 246, 0.25);
}

.checkbox-row {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  cursor: pointer;
  user-select: none;
}
.checkbox-row input {
  width: 18px;
  height: 18px;
  accent-color: var(--color-primary);
  cursor: pointer;
}

/* ==================== 認証 (ログイン画面) ==================== */
.auth-wrapper {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  background-image: radial-gradient(circle at 15% 20%, rgba(59, 130, 246, 0.04) 0%, transparent 40%),
                    radial-gradient(circle at 85% 80%, rgba(139, 92, 246, 0.04) 0%, transparent 45%);
}

.auth-card {
  background: #ffffff;
  backdrop-filter: blur(20px);
  border: 1px solid var(--panel-border);
  border-radius: var(--border-radius-lg);
  padding: 3rem 2.5rem;
  width: 100%;
  max-width: 430px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.04);
}

.auth-header {
  text-align: center;
  margin-bottom: 2.5rem;
}

.logo-circle {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: var(--primary-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.25rem;
  padding: 4px;
  box-shadow: 0 8px 25px rgba(59, 130, 246, 0.25);
}

.logo-circle img {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
  background-color: var(--bg-color);
}

.auth-header h1 {
  font-size: 1.85rem;
  font-weight: 800;
  margin-bottom: 0.35rem;
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -0.5px;
}

.auth-header p {
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.error-msg {
  background-color: rgba(239, 68, 68, 0.06);
  border: 1px solid rgba(239, 68, 68, 0.15);
  color: #ef4444;
  padding: 0.85rem;
  border-radius: var(--border-radius-sm);
  font-size: 0.85rem;
  margin-bottom: 1.25rem;
  text-align: center;
}

/* ==================== メインレイアウト ==================== */
.app-layout {
  display: flex;
  min-height: 100vh;
}

/* PC版サイドバー */
.sidebar {
  width: var(--sidebar-width);
  background: #ffffff;
  backdrop-filter: blur(25px);
  border-right: 1px solid var(--panel-border);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  z-index: 100;
}

.sidebar-header {
  padding: 2rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.sidebar-logo {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.15);
}

.app-title {
  font-size: 1.35rem;
  font-weight: 800;
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -0.5px;
}

.sidebar-nav {
  padding: 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  flex: 1;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 0.9rem 1.1rem;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--border-radius-sm);
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  border-left: 3px solid transparent;
}

.nav-item:hover {
  background-color: rgba(0, 0, 0, 0.03);
  color: var(--text-primary);
  transform: translateX(2px);
}

.nav-item.active {
  background-color: rgba(59, 130, 246, 0.06);
  color: var(--color-primary);
  border-left-color: var(--color-primary);
  box-shadow: none;
}

.sidebar-footer {
  padding: 1.5rem;
  border-top: 1px solid var(--panel-border);
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

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

/* メインコンテンツ */
.main-content {
  flex: 1;
  margin-left: var(--sidebar-width);
  padding: 2.5rem;
  min-height: 100vh;
}

.mobile-header {
  display: none;
}

.mobile-nav {
  display: none;
}

/* ==================== カード & レイアウト ==================== */
.card {
  background: var(--panel-bg);
  backdrop-filter: blur(16px);
  border: 1px solid var(--panel-border);
  border-radius: var(--border-radius-md);
  padding: 1.75rem;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.02);
  margin-bottom: 1.75rem;
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1), 
              border-color 0.3s cubic-bezier(0.4, 0, 0.2, 1), 
              box-shadow 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  min-width: 0;
  max-width: 100%;
}

.card:hover {
  transform: translateY(-2px);
  border-color: rgba(59, 130, 246, 0.15);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.05);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.25rem;
}

.card h2 {
  font-size: 1.45rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  letter-spacing: -0.3px;
}

.card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--text-primary);
  letter-spacing: -0.2px;
}

.description {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 1.4rem;
}

/* グリッドレイアウト */
.dashboard-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.75rem;
}

.grid-2col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.75rem;
}

/* プレミアムグラデーションカード */
.balance-summary-card.gradient-primary {
  background: linear-gradient(135deg, #1e40af 0%, #3b82f6 100%);
  border: 1px solid rgba(59, 130, 246, 0.2);
  box-shadow: 0 10px 30px rgba(59, 130, 246, 0.15);
  color: #ffffff;
  position: relative;
  overflow: hidden;
}

.balance-summary-card.gradient-primary .balance-item .title {
  color: rgba(255, 255, 255, 0.72);
}

.balance-summary-card.gradient-primary .balance-item-sub .title {
  color: rgba(255, 255, 255, 0.68);
}

.balance-summary-card.gradient-primary::after {
  content: '';
  position: absolute;
  top: -50%;
  right: -30%;
  width: 250px;
  height: 250px;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.15) 0%, transparent 70%);
  z-index: 1;
  pointer-events: none;
}

.balance-summary-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 175px;
}

.balance-item {
  display: flex;
  flex-direction: column;
  z-index: 2;
}

.balance-item .title {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.balance-item .amount {
  font-size: 2.5rem;
  font-weight: 800;
  margin-top: 0.25rem;
  letter-spacing: -1px;
  background: linear-gradient(to right, #ffffff, #e2e8f0);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.balance-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  margin-top: 1.25rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 1rem;
  z-index: 2;
}

.balance-item-sub {
  display: flex;
  flex-direction: column;
}

.balance-item-sub .title {
  font-size: 0.75rem;
  color: var(--text-secondary);
  opacity: 0.8;
  font-weight: 500;
}

.balance-item-sub .amount-sub {
  font-size: 1.2rem;
  font-weight: 700;
  color: #ffffff;
  margin-top: 0.1rem;
}

/* ==================== グラフ・チャート ==================== */
.chart-container {
  position: relative;
  width: 100%;
  height: 280px;
}

/* ==================== アイテムリスト・テーブル ==================== */
.item-list {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.list-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.9rem 1.25rem;
  background-color: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: var(--border-radius-sm);
  transition: all 0.2s ease;
}

.list-item:hover {
  background-color: #f8fafc;
  border-color: var(--color-primary);
  transform: translateX(2px);
}

.list-item-title {
  font-weight: 600;
  font-size: 0.95rem;
}

.list-item-sub {
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.list-item-right {
  text-align: right;
}

/* アラートボックス */
.alert-box {
  display: flex;
  align-items: flex-start;
  gap: 1.2rem;
  padding: 1.1rem 1.5rem;
  border-radius: var(--border-radius-md);
  margin-bottom: 1.75rem;
  grid-column: span 2;
}

.alert-danger {
  background: rgba(239, 68, 68, 0.06);
  border: 1px solid rgba(239, 68, 68, 0.15);
  color: #ef4444;
  backdrop-filter: blur(10px);
}

.alert-icon {
  font-size: 1.5rem;
  color: #ef4444;
}

.alert-content h4 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.alert-content p {
  font-size: 0.88rem;
  line-height: 1.5;
}

/* テーブルデザイン */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  border-radius: var(--border-radius-sm);
  background-color: var(--panel-bg);
  border: 1px solid var(--panel-border);
}

.table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.table th,
.table td {
  padding: 1rem 1.25rem;
  font-size: 0.92rem;
  border-bottom: 1px solid var(--panel-border);
}

.table th {
  font-weight: 700;
  color: var(--text-secondary);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  background-color: #f8fafc;
}

.table td {
  color: var(--text-primary);
}

.table-hover tbody tr {
  transition: background-color 0.2s ease;
}

.table-hover tbody tr:hover {
  background-color: #f8fafc;
}

.badge {
  display: inline-block;
  padding: 3px 10px;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 20px;
  letter-spacing: 0.02em;
}

.badge-personal { background-color: #f1f5f9; color: var(--text-secondary); }
.badge-corp { background-color: rgba(139, 92, 246, 0.08); color: #6d28d9; border: 1px solid rgba(139, 92, 246, 0.15); }
.badge-closed { background-color: rgba(16, 185, 129, 0.08); color: #047857; border: 1px solid rgba(16, 185, 129, 0.15); }
.badge-pending { background-color: rgba(245, 158, 11, 0.08); color: #b45309; border: 1px solid rgba(245, 158, 11, 0.15); }

/* カテゴリ・マスタ設定のレイアウト */
.category-grid-layout {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 1.25rem;
}

.category-card {
  padding: 0.9rem 1.25rem;
  border-radius: var(--border-radius-sm);
  background-color: var(--panel-bg);
  border: 1px solid var(--panel-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: all 0.2s ease;
}

.category-card:hover {
  background-color: #f8fafc;
  border-color: var(--color-primary);
}

/* ==================== カレンダー ==================== */
.calendar-header-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.75rem;
}

.calendar-weekdays {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  text-align: center;
  font-weight: 700;
  color: var(--text-secondary);
  font-size: 0.8rem;
  margin-bottom: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.calendar-days-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 6px;
}

.calendar-day-cell {
  aspect-ratio: 1.1;
  background-color: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: var(--border-radius-sm);
  padding: 8px;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  cursor: pointer;
  transition: all 0.25s ease;
  min-height: 90px;
}
.calendar-day-cell:hover {
  background-color: #f8fafc;
  border-color: var(--color-primary);
  transform: scale(1.02);
  z-index: 5;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.05);
}

.calendar-day-cell.other-month {
  opacity: 0.35;
}

.calendar-day-num {
  font-weight: 700;
  font-size: 0.85rem;
}

.calendar-day-cell.today {
  border-color: var(--color-primary);
  background-color: rgba(59, 130, 246, 0.05);
  box-shadow: none;
}

.calendar-events-indicator {
  display: flex;
  flex-direction: column;
  gap: 3px;
  overflow: hidden;
  max-height: 55px;
  margin-top: 4px;
}

.cal-event-bar {
  font-size: 0.65rem;
  font-weight: 600;
  padding: 2px 5px;
  border-radius: 4px;
  white-space: nowrap;
  text-overflow: ellipsis;
  overflow: hidden;
  max-width: 100%;
  line-height: 1.2;
}
.cal-event-income { background-color: rgba(16, 185, 129, 0.08); color: #047857; border: 1px solid rgba(16, 185, 129, 0.15); }
.cal-event-expense { background-color: rgba(239, 68, 68, 0.06); color: #b91c1c; border: 1px solid rgba(239, 68, 68, 0.15); }
.cal-event-credit { background-color: rgba(139, 92, 246, 0.08); color: #6d28d9; border: 1px solid rgba(139, 92, 246, 0.15); }

/* ==================== 締め処理画面 ==================== */
.closure-summary {
  background-color: #f8fafc;
  padding: 1.5rem;
  border-radius: var(--border-radius-sm);
  border: 1px solid var(--panel-border);
}

.stats-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.6rem 0;
  font-size: 0.95rem;
}

.stats-row.large {
  font-size: 1.2rem;
  font-weight: 700;
  margin-top: 0.75rem;
  border-top: 1px solid var(--panel-border);
  padding-top: 1rem;
}

/* ==================== システム設定サブタブ ==================== */
.settings-tabs {
  display: flex;
  gap: 0.5rem;
  border-bottom: 1px solid var(--panel-border);
  padding-bottom: 1px;
  margin-bottom: 1.75rem;
  overflow-x: auto;
}

.settings-tab-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  padding: 0.85rem 1.5rem;
  font-family: inherit;
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  white-space: nowrap;
  transition: all var(--transition-speed);
}

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

.settings-tab-btn.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.settings-subpane {
  display: none;
}
.settings-subpane.active {
  display: block;
}

.log-area {
  width: 100%;
  height: 280px;
  font-family: 'Fira Code', 'Courier New', monospace;
  font-size: 0.8rem;
  background-color: #03050a;
  border: 1px solid var(--panel-border);
  border-radius: var(--border-radius-sm);
  padding: 1rem;
  resize: vertical;
  color: #34d399;
}

/* ==================== モーダル ==================== */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.75);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  backdrop-filter: blur(8px);
}

.modal-content {
  background-color: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: var(--border-radius-md);
  padding: 2rem;
  width: 100%;
  max-width: 500px;
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.05);
  animation: modalSlideUp 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes modalSlideUp {
  from {
    transform: translateY(20px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}

.btn-close {
  background: transparent;
  border: none;
  font-size: 1.75rem;
  color: var(--text-secondary);
  cursor: pointer;
  line-height: 1;
  transition: color 0.2s;
}
.btn-close:hover {
  color: var(--color-danger);
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 0.85rem;
}

/* ==================== レレスポンス設計: スマホ対応 ==================== */
@media (max-width: 768px) {
  .sidebar {
    display: none;
  }
  
  .main-content {
    margin-left: 0;
    padding: 1.25rem;
    padding-bottom: calc(var(--mobile-nav-height) + 2rem);
    min-width: 0;
    width: 100%;
    overflow-x: hidden;
  }

  .calendar-grid-wrapper {
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .calendar-weekdays,
  .calendar-days-grid {
    min-width: 680px;
  }
  
  .mobile-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0 1.25rem;
    border-bottom: 1px solid var(--panel-border);
    margin-bottom: 1.5rem;
  }
  
  .mobile-logo-group {
    display: flex;
    align-items: center;
    gap: 0.6rem;
  }
  
  .mobile-logo {
    width: 30px;
    height: 30px;
    border-radius: 8px;
    box-shadow: 0 4px 10px rgba(59, 130, 246, 0.15);
  }
  
  .mobile-app-title {
    font-size: 1.25rem;
    font-weight: 800;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -0.5px;
  }
  
  .dashboard-grid,
  .grid-2col {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  
  .span-2 {
    grid-column: span 1;
  }
  
  /* スマホ向けにボトムナビをカプセル状に浮遊させる（プレミアムデザイン） */
  .mobile-nav {
    display: flex;
    position: fixed;
    bottom: 16px;
    left: 16px;
    right: 16px;
    height: 62px;
    background-color: rgba(255, 255, 255, 0.85);
    border: 1px solid rgba(0, 0, 0, 0.06);
    border-radius: 24px;
    z-index: 100;
    justify-content: space-around;
    align-items: center;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.06);
    backdrop-filter: blur(20px);
    padding: 0 8px;
  }
  
  .mobile-nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 0.65rem;
    font-weight: 600;
    gap: 1px;
    flex: 1;
    height: 100%;
    justify-content: center;
    transition: all 0.2s ease;
    border-radius: 16px;
  }
  
  .mobile-nav-item .icon {
    font-size: 1.4rem;
    transition: transform 0.2s ease;
  }
  
  .mobile-nav-item:active .icon {
    transform: scale(0.9);
  }
  
  .mobile-nav-item.active {
    color: var(--color-primary);
  }
  
  .mobile-nav-item.active .icon {
    transform: scale(1.1);
    filter: drop-shadow(0 0 4px rgba(59, 130, 246, 0.2));
  }
  
  .tab-pane {
    display: none;
  }
  
  .tab-pane.active {
    display: block;
  }
  
  .calendar-day-cell {
    min-height: 65px;
    padding: 4px;
  }
  .calendar-day-num {
    font-size: 0.75rem;
  }
  .cal-event-bar {
    font-size: 0.55rem;
    padding: 1px 3px;
  }
}

.grid-3col {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

@media (max-width: 768px) {
  .grid-3col {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
}