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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  line-height: 1.6;
  color: #333;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  padding: 20px;
}

.container {
  max-width: 800px;
  margin: 0 auto;
  background: #fff;
  border-radius: 16px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  overflow: hidden;
}

header {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: #fff;
  padding: 30px;
  text-align: center;
}

header h1 {
  font-size: 2.5rem;
  margin-bottom: 10px;
  font-weight: 700;
}

header .subtitle {
  font-size: 1rem;
  opacity: 0.9;
}

main {
  padding: 30px;
}

section {
  margin-bottom: 40px;
}

h2 {
  font-size: 1.5rem;
  margin-bottom: 20px;
  color: #667eea;
  font-weight: 600;
}

.post-form form {
  display: flex;
  flex-direction: column;
  gap: 15px;
}

textarea {
  width: 100%;
  padding: 15px;
  border: 2px solid #e0e0e0;
  border-radius: 8px;
  font-size: 1rem;
  font-family: inherit;
  resize: vertical;
  min-height: 100px;
  transition: border-color 0.3s;
}

textarea:focus {
  outline: none;
  border-color: #667eea;
}

.form-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.char-count {
  color: #666;
  font-size: 0.9rem;
}

button {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: #fff;
  border: none;
  padding: 12px 30px;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
}

button:hover {
  transform: translateY(-2px);
  box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

button:active {
  transform: translateY(0);
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.message-area {
  margin-top: 15px;
  padding: 12px;
  border-radius: 8px;
  font-size: 0.9rem;
  display: none;
}

.message-area.success {
  background: #d4edda;
  color: #155724;
  border: 1px solid #c3e6cb;
  display: block;
}

.message-area.error {
  background: #f8d7da;
  color: #721c24;
  border: 1px solid #f5c6cb;
  display: block;
}

.comments-list {
  display: flex;
  flex-direction: column;
  gap: 15px;
}

.comment {
  background: #f8f9fa;
  padding: 20px;
  border-radius: 8px;
  border-left: 4px solid #667eea;
  transition: transform 0.2s, box-shadow 0.2s;
}

.comment:hover {
  transform: translateX(5px);
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.comment-message {
  font-size: 1rem;
  margin-bottom: 10px;
  word-wrap: break-word;
}

.comment-message.hidden-message {
  color: #999;
  cursor: pointer;
  user-select: none;
}

.comment-message.hidden-message:hover {
  color: #667eea;
}

.comment-meta {
  font-size: 0.85rem;
  color: #666;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.comment-date {
  font-style: italic;
}

.loading {
  text-align: center;
  padding: 40px;
  color: #666;
  font-size: 1.1rem;
}

.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: #999;
}

.empty-state p {
  font-size: 1.1rem;
  margin-bottom: 10px;
}

footer {
  background: #f8f9fa;
  padding: 20px;
  text-align: center;
  color: #666;
  font-size: 0.9rem;
}

@media (max-width: 768px) {
  body {
    padding: 10px;
  }

  header h1 {
    font-size: 2rem;
  }

  main {
    padding: 20px;
  }

  h2 {
    font-size: 1.3rem;
  }

  .form-footer {
    flex-direction: column;
    gap: 10px;
    align-items: stretch;
  }

  button {
    width: 100%;
  }

  .comment {
    padding: 15px;
  }

  .comment-meta {
    flex-direction: column;
    align-items: flex-start;
    gap: 5px;
  }
}