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

body {
  margin: 0;
  font-family: 'Segoe UI', 'Hiragino Sans', 'Meiryo', sans-serif;
  background: #f4f6f8;
  color: #1f2937;
}

a {
  color: inherit;
  text-decoration: none;
}

.app {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: 240px;
  background: #111827;
  color: #f9fafb;
  display: flex;
  flex-direction: column;
  padding: 24px 16px;
}

.sidebar-header h1 {
  margin: 0 0 8px;
  font-size: 1.25rem;
}

.user-name {
  margin: 0;
  font-size: 0.875rem;
  color: #9ca3af;
}

.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 32px;
  flex: 1;
}

.sidebar-nav a {
  padding: 10px 12px;
  border-radius: 8px;
  transition: background 0.2s;
}

.sidebar-nav a:hover,
.sidebar-nav a.active {
  background: #374151;
}

.logout-form button {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid #4b5563;
  border-radius: 8px;
  background: transparent;
  color: #f9fafb;
  cursor: pointer;
}

.content {
  flex: 1;
  padding: 32px;
}

.content h2 {
  margin-top: 0;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin-top: 24px;
}

.card {
  background: #fff;
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
  transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.panel {
  background: #fff;
  border-radius: 12px;
  padding: 20px;
  margin-bottom: 20px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

.upload-form {
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
}

button,
.upload-form input[type='file'] {
  font: inherit;
}

button {
  padding: 10px 16px;
  border: none;
  border-radius: 8px;
  background: #2563eb;
  color: #fff;
  cursor: pointer;
}

.file-table {
  width: 100%;
  border-collapse: collapse;
}

.file-table th,
.file-table td {
  padding: 10px 8px;
  border-bottom: 1px solid #e5e7eb;
  text-align: left;
}

.info-entry {
  background: #fff;
  border-radius: 12px;
  padding: 20px;
  margin-bottom: 16px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

.info-content {
  line-height: 1.7;
}

.info-meta {
  margin-bottom: 0;
  font-size: 0.875rem;
  color: #6b7280;
}

.alert {
  padding: 12px 16px;
  border-radius: 8px;
  margin-bottom: 16px;
}

.alert-error {
  background: #fee2e2;
  color: #991b1b;
}

.alert-success {
  background: #dcfce7;
  color: #166534;
}

.empty-message {
  color: #6b7280;
}

.login-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
}

.login-card {
  width: 100%;
  max-width: 400px;
  background: #fff;
  padding: 32px;
  border-radius: 12px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
}

.login-card h1 {
  margin: 0;
}

.login-subtitle {
  color: #6b7280;
  margin-top: 8px;
}

.login-card label {
  display: block;
  margin-top: 16px;
  font-size: 0.875rem;
}

.login-card input {
  width: 100%;
  margin-top: 6px;
  padding: 10px 12px;
  border: 1px solid #d1d5db;
  border-radius: 8px;
  font: inherit;
}

.login-card button {
  width: 100%;
  margin-top: 24px;
}

@media (max-width: 768px) {
  .app {
    flex-direction: column;
  }

  .sidebar {
    width: 100%;
  }

  .sidebar-nav {
    flex-direction: row;
    flex-wrap: wrap;
  }
}