:root {
  color-scheme: light;
  font-family: 'SimSun', '宋体', 'Microsoft YaHei', system-ui, sans-serif;
  background: #f4f1e8;
  color: #1a1a1a;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
}

.page {
  max-width: 960px;
  margin: 0 auto;
  padding: 16px;
  background: #ffffff;
  border: 1px solid #b7b7b7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.header {
  text-align: center;
  border-bottom: 2px solid #ad1c1c;
  padding-bottom: 12px;
  margin-bottom: 20px;
}

.header__crest {
  font-size: 28px;
  letter-spacing: 4px;
}

.header__subtitle {
  margin: 8px 0 0;
  font-size: 14px;
  color: #555555;
}

.main {
  flex: 1;
  display: grid;
  gap: 24px;
}

.panel,
.chat {
  border: 1px solid #c6c6c6;
  background: #fdfbf5;
  padding: 16px 20px;
  box-shadow: inset 0 0 0 1px #ffffff;
}

.panel__title {
  margin: 0 0 8px;
  font-size: 22px;
  border-left: 6px solid #ad1c1c;
  padding-left: 8px;
}

.panel__desc {
  margin: 0 0 16px;
  line-height: 1.6;
}

.panel__form {
  border: 1px dashed #c3c3c3;
  padding: 12px;
  background: #ffffff;
}

.panel__form label {
  display: block;
  margin-bottom: 6px;
  font-weight: bold;
}

.panel__form-row {
  display: flex;
  gap: 8px;
}

.panel__form-row input {
  flex: 1;
  padding: 8px;
  border: 1px solid #b0b0b0;
  font-size: 16px;
}

.panel__form-row button {
  padding: 8px 18px;
  border: 1px solid #8c0000;
  background: #dcd1c2;
  cursor: pointer;
  font-weight: bold;
}

.panel__form-row button:hover {
  background: #c7b59a;
}

.panel__feedback {
  min-height: 18px;
  margin-top: 8px;
  font-size: 14px;
  color: #555555;
}

.panel__feedback--error {
  color: #b40000;
}

.panel__feedback--success {
  color: #1f6e1f;
}

.panel__tips {
  display: grid;
  gap: 8px;
  margin: 16px 0 0;
  padding: 12px;
  border: 1px solid #d2d2d2;
  background: #fffdf7;
}

.panel__tips dt {
  font-weight: bold;
  margin-bottom: 2px;
}

.panel__tips dd {
  margin: 0;
  color: #3f3f3f;
}

.chat__title {
  margin: 0 0 6px;
  font-size: 20px;
  border-left: 6px solid #4e5368;
  padding-left: 8px;
}

.chat__intro {
  margin: 0 0 12px;
  font-size: 14px;
  color: #4a4a4a;
}

.chat__log {
  border: 1px solid #cfcfcf;
  background: #ffffff;
  padding: 12px;
  max-height: 320px;
  overflow-y: auto;
}

.chat__placeholder {
  padding: 12px;
  background: #f5f5f5;
  border: 1px dashed #c6c6c6;
  text-align: center;
  color: #666666;
}

.chat__item {
  border-bottom: 1px dashed #d9d9d9;
  padding: 10px 0;
}

.chat__item:last-child {
  border-bottom: none;
}

.chat__item-header {
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  color: #5b5b5b;
  margin-bottom: 4px;
}

.chat__item-body {
  margin: 0;
  line-height: 1.6;
  white-space: pre-wrap;
}

.chat__form {
  margin-top: 12px;
  display: grid;
  gap: 6px;
}

.chat__form textarea {
  resize: vertical;
  border: 1px solid #bfbfbf;
  padding: 8px;
  font-size: 15px;
}

.chat__form-actions {
  display: flex;
  gap: 8px;
  justify-content: flex-end;
}

.chat__form button {
  padding: 6px 14px;
  border: 1px solid #5c5c5c;
  background: #e7e7e7;
  cursor: pointer;
}

.chat__form button:hover {
  background: #d4d4d4;
}

.chat__form-clear {
  color: #a00000;
  border-color: #a00000;
}

.footer {
  margin-top: 24px;
  text-align: center;
  font-size: 12px;
  color: #666666;
  border-top: 1px solid #c9c9c9;
  padding-top: 12px;
}

.shake {
  animation: shake 0.3s linear;
}

@keyframes shake {
  0% {
    transform: translateX(0);
  }
  25% {
    transform: translateX(-4px);
  }
  50% {
    transform: translateX(4px);
  }
  75% {
    transform: translateX(-4px);
  }
  100% {
    transform: translateX(0);
  }
}

@media (max-width: 720px) {
  .panel__form-row {
    flex-direction: column;
  }

  .panel__form-row button {
    width: 100%;
  }

  .chat__form-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .chat__form button {
    width: 100%;
  }
}