/* ===== サイドカラム付きレイアウト ===== */

:root {
  --sidebar-width: 220px;
  --primary: #3b82f6;
  --primary-hover: #2563eb;
  --primary-light: #eff6ff;
  --primary-border: #bfdbfe;
  --success: #22c55e;
  --success-light: #f0fdf4;
  --success-border: #bbf7d0;
  --warning: #f59e0b;
  --warning-light: #fefce8;
  --warning-border: #fde68a;
  --danger: #ef4444;
  --danger-light: #fef2f2;
  --gray-50: #f8fafc;
  --gray-100: #f1f5f9;
  --gray-200: #e2e8f0;
  --gray-300: #cbd5e1;
  --gray-400: #94a3b8;
  --gray-500: #64748b;
  --gray-600: #475569;
  --gray-700: #334155;
  --gray-800: #1e293b;
  --gray-900: #0f172a;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
  --shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.04), 0 2px 4px rgba(0,0,0,0.03);
}

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

body {
  font-family: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, sans-serif;
  background: #f5f7fa;
  color: var(--gray-800);
  line-height: 1.8;
  min-height: 100vh;
}

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

/* ===== サイドバー ===== */
.sidebar {
  width: var(--sidebar-width);
  background: white;
  border-right: 1px solid var(--gray-200);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  z-index: 200;
}

.sidebar-brand {
  padding: 24px 20px 20px;
  border-bottom: 1px solid var(--gray-200);
}

.sidebar-brand-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--gray-800);
  line-height: 1.5;
}

.sidebar-nav {
  flex: 1;
  padding: 12px 0;
}

.sidebar-nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 20px;
  font-size: 14px;
  font-weight: 500;
  color: var(--gray-600);
  text-decoration: none;
  transition: all 0.15s;
  border-left: 3px solid transparent;
  cursor: pointer;
}

.sidebar-nav-item:hover {
  background: var(--gray-50);
  color: var(--gray-800);
}

.sidebar-nav-item.active {
  background: var(--primary-light);
  color: var(--primary);
  border-left-color: var(--primary);
  font-weight: 600;
}

.sidebar-nav-item .nav-icon {
  font-size: 18px;
  width: 24px;
  text-align: center;
  flex-shrink: 0;
}

.sidebar-footer {
  padding: 16px 20px;
  border-top: 1px solid var(--gray-200);
}

.sidebar-logout-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 10px 0;
  font-size: 13px;
  color: var(--gray-400);
  background: none;
  border: none;
  cursor: pointer;
  font-family: inherit;
  transition: color 0.15s;
}

.sidebar-logout-btn:hover {
  color: var(--gray-600);
}

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

.main-header {
  background: white;
  border-bottom: 1px solid var(--gray-200);
  padding: 16px 32px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 100;
}

.main-header-greeting {
  font-size: 16px;
  font-weight: 600;
  color: var(--gray-800);
}

.main-header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.main-body {
  padding: 32px;
  max-width: 900px;
}

/* ===== ダッシュボード カード ===== */
.dash-card {
  background: white;
  border-radius: var(--radius);
  padding: 28px 32px;
  box-shadow: var(--shadow);
  border: 1px solid var(--gray-200);
  margin-bottom: 20px;
}

.dash-card-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--gray-500);
  margin-bottom: 16px;
}

.dash-card-body {
  font-size: 15px;
  color: var(--gray-700);
}

/* 今週の課題カード */
.kadai-highlight {
  border-left: 4px solid var(--primary);
}

.kadai-highlight-name {
  font-size: 18px;
  font-weight: 700;
  color: var(--gray-800);
  margin-bottom: 6px;
}

.kadai-highlight-desc {
  font-size: 14px;
  color: var(--gray-500);
  margin-bottom: 16px;
}

.btn-action {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 24px;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.2s;
  font-family: inherit;
}

.btn-action:hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(59,130,246,0.3);
}

/* DLカード */
.download-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.download-card-text {
  font-size: 14px;
  color: var(--gray-500);
}

.btn-download {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 20px;
  background: var(--gray-50);
  color: var(--gray-600);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.15s;
  font-family: inherit;
  white-space: nowrap;
}

.btn-download:hover {
  background: var(--gray-100);
  color: var(--gray-800);
}

/* お知らせカード */
.notice-empty {
  font-size: 14px;
  color: var(--gray-400);
}

/* ===== 課題一覧 ===== */
.kadai-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.kadai-card {
  background: white;
  border-radius: var(--radius);
  padding: 24px 28px;
  box-shadow: var(--shadow);
  border: 1px solid var(--gray-200);
  transition: all 0.2s;
}

.kadai-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.kadai-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 8px;
}

.kadai-card-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--gray-800);
}

.kadai-card-desc {
  font-size: 14px;
  color: var(--gray-500);
  margin-bottom: 14px;
}

.kadai-card-footer {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 12px;
  margin-left: -12px;
}

.kadai-status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 20px;
}

.kadai-status.working {
  background: var(--warning-light);
  color: var(--warning);
  border: 1px solid var(--warning-border);
}

.kadai-status.submitted {
  background: var(--primary-light);
  color: var(--primary);
  border: 1px solid var(--primary-border);
}

.kadai-status.reviewed {
  background: var(--success-light);
  color: var(--success);
  border: 1px solid var(--success-border);
}

.kadai-status.locked {
  background: var(--gray-50);
  color: var(--gray-400);
  border: 1px solid var(--gray-200);
}

.kadai-card-action {
  display: inline-flex;
  align-items: center;
  font-size: 14px;
  font-weight: 600;
  color: white;
  text-decoration: none;
  padding: 10px 24px;
  border-radius: 6px;
  background: var(--primary);
  border: none;
  transition: all 0.2s;
}

.kadai-card-action:hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(59,130,246,0.3);
  color: white;
}

.kadai-card-action.review-link {
  background: var(--success);
  color: white;
}

.kadai-card-action.review-link:hover {
  background: #15803d;
  box-shadow: 0 4px 12px rgba(34,197,94,0.3);
}

/* ===== ページ読み込み ===== */
.page-loading {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  font-size: 16px;
  color: var(--gray-500);
}

/* ===== モバイル対応 ===== */
.sidebar-toggle {
  display: none;
  background: white;
  border: 1px solid var(--gray-200);
  border-radius: 8px;
  padding: 8px 12px;
  font-size: 18px;
  cursor: pointer;
  color: var(--gray-600);
}

.sidebar-overlay {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.3);
  z-index: 190;
}

@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
    transition: transform 0.3s ease;
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .sidebar-overlay.show {
    display: block;
  }

  .main-content {
    margin-left: 0;
  }

  .sidebar-toggle {
    display: block;
  }

  .main-body {
    padding: 20px 16px;
  }

  .main-header {
    padding: 12px 16px;
  }
}