* {
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: #f4f5f7;
  color: #1c1e21;
  margin: 0;
  padding: 2rem 1rem;
}

.container {
  max-width: 480px;
  margin: 0 auto;
  background: #fff;
  border-radius: 12px;
  padding: 2rem;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.08);
}

h1 {
  margin-top: 0;
  font-size: 1.5rem;
}

.tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.tab {
  flex: 1;
  background: #eceef1;
  border: none;
  padding: 0.6rem;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.95rem;
}

.tab.active {
  background: #2563eb;
  color: #fff;
}

form {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

input {
  padding: 0.7rem;
  border: 1px solid #d0d3d8;
  border-radius: 8px;
  font-size: 1rem;
}

button[type='submit'],
#logout {
  background: #2563eb;
  color: #fff;
  border: none;
  padding: 0.7rem;
  border-radius: 8px;
  cursor: pointer;
  font-size: 1rem;
}

#logout {
  padding: 0.4rem 0.8rem;
  font-size: 0.85rem;
}

.error {
  color: #dc2626;
  min-height: 1.2rem;
  font-size: 0.9rem;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
  font-size: 0.9rem;
  color: #555;
}

#project-form {
  flex-direction: row;
  margin-bottom: 1rem;
}

#project-form input {
  flex: 1;
}

ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

li {
  padding: 0.7rem;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  margin-bottom: 0.5rem;
}

li.empty {
  color: #999;
  text-align: center;
  border-style: dashed;
}