* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; background: #f5f7fa; color: #333; line-height: 1.6; }
.container { max-width: 800px; margin: 0 auto; padding: 20px; }
header { text-align: center; padding: 30px 0; }
header h1 { font-size: 2rem; color: #2c3e50; margin-bottom: 8px; }
header p { color: #7f8c8d; }
main { display: flex; flex-direction: column; gap: 30px; }
.form-section, .messages-section { background: #fff; border-radius: 12px; padding: 24px; box-shadow: 0 2px 8px rgba(0,0,0,0.08); }
h2 { font-size: 1.25rem; color: #2c3e50; margin-bottom: 20px; padding-bottom: 10px; border-bottom: 2px solid #3498db; }
.form-group { margin-bottom: 16px; }
.form-group label { display: block; margin-bottom: 6px; font-weight: 500; color: #555; }
.required { color: #e74c3c; }
.form-group input, .form-group textarea { width: 100%; padding: 12px; border: 1px solid #ddd; border-radius: 8px; font-size: 1rem; transition: border-color 0.2s, box-shadow 0.2s; }
.form-group input:focus, .form-group textarea:focus { outline: none; border-color: #3498db; box-shadow: 0 0 0 3px rgba(52,152,219,0.1); }
.char-count { display: block; text-align: right; font-size: 0.85rem; color: #999; margin-top: 4px; }
button[type="submit"] { width: 100%; padding: 14px; background: #3498db; color: #fff; border: none; border-radius: 8px; font-size: 1rem; font-weight: 600; cursor: pointer; transition: background 0.2s; }
button[type="submit"]:hover { background: #2980b9; }
button[type="submit"]:disabled { background: #bdc3c7; cursor: not-allowed; }
.form-message { margin-top: 12px; padding: 12px; border-radius: 8px; text-align: center; }
.form-message.success { background: #d4edda; color: #155724; }
.form-message.error { background: #f8d7da; color: #721c24; }
.form-message.hidden { display: none; }
.messages-list { display: flex; flex-direction: column; gap: 16px; }
.message-item { padding: 16px; background: #f8f9fa; border-radius: 8px; border-left: 4px solid #3498db; }
.message-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 10px; }
.message-name { font-weight: 600; color: #2c3e50; }
.message-time { font-size: 0.85rem; color: #999; }
.message-content { color: #555; white-space: pre-wrap; word-break: break-word; }
.loading, .empty { text-align: center; color: #999; padding: 20px; }
footer { text-align: center; padding: 30px 0; color: #999; font-size: 0.9rem; }