/* 全局样式 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* 页面级约束，允许滚动与自适应内容高度 */
html, body {
  height: auto;
  overflow: auto;
  background-color: #f5f5f5;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

/* Header 样式 */
.header {
  background: linear-gradient(135deg, #F03663 0%, #F06666 100%);
  color: white;
  padding: 20px;
  text-align: center;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
  position: relative;
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  height: 64px;
}

.logo {
  position: absolute;
  left: 20px;
  top: 50%;
  transform: translateY(-50%);
}

.logo a {
  color: white;
  text-decoration: none;
  font-weight: bold;
  font-size: 18px;
}

.header h1 {
  font-size: 28px;
  font-weight: 300;
  margin: 0;
  width: 100%;
  text-align: center;
}

/* 页面主容器，避免与 Help 的 .container 等类名冲突 */
.page {
  max-width: 980px;
  margin: 24px auto;
  padding: 0 16px 48px;
}

/* 卡片式容器，跟随 Help 的配色与阴影风格 */
.calc-card {
  background: #fff;
  border: 1px solid #e0e0e0;
  border-radius: 8px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.06);
  padding: 20px;
}

.section-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 16px;
  color: #333;
}

.form-row {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 14px;
}

.form-row label {
  font-size: 14px;
  color: #555;
}

input[type="text"], select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid #bbb;
  border-radius: 6px;
  font-size: 14px;
  transition: border-color .2s ease, box-shadow .2s ease;
  background: #fff;
}

input[type="text"]:focus, select:focus {
  outline: none;
  border-color: #667eea;
  box-shadow: 0 0 0 2px rgba(102, 126, 234, 0.12);
}

/* 占位符更淡的显示，避免影响正常文本；不使用 opacity，避免影响边框观感 */
input[type="text"]::placeholder {
  color: #a8a8a8;
}

/* 占位符更淡的显示，避免影响正常文本 */
input[type="text"]::placeholder {
  color: #a8a8a8;
  opacity: 0.85;
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 10px 0 4px;
}

.btn {
  appearance: none;
  border: 1px solid #ddd;
  background: #fff;
  color: #333;
  padding: 8px 14px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 14px;
  transition: transform .05s ease, box-shadow .2s ease, border-color .2s ease;
}

.btn:hover {
  border-color: #ccc;
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}

.btn:active {
  transform: translateY(1px);
}

.btn.primary {
  background: linear-gradient(135deg, #F03663 0%, #F06666 100%);
  color: #fff;
  border: none;
}

/* 运算按钮组样式 */
.op-group {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}
.btn.toggle {
  border-color: #bbb;
}
.btn.toggle.active {
  background: #F03663;
  color: #fff;
  border-color: #F03663;
}

.alert {
  margin: 8px 0 4px;
  padding: 10px 12px;
  border-radius: 6px;
  border: 1px solid #ffd1d1;
  background: #fff1f1;
  color: #b3261e;
  font-size: 13px;
  word-break: break-all;
}

.result-box {
  margin-top: 10px;
  padding: 12px;
  border: 1px solid #eee;
  border-radius: 6px;
  background: #fafafa;
}

.result-line {
  display: flex;
  gap: 8px;
  align-items: baseline;
  margin-bottom: 6px;
}

.result-label {
  min-width: 48px;
  color: #666;
  font-size: 14px;
}

.mono {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: 14px;
  word-break: break-all;
}

.hint {
  color: #777;
  font-size: 12px;
  margin-top: 10px;
}

/* 进制单选按钮组 */
.radio-group {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.radio {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  color: #333;
}

.radio input[type="radio"] {
  accent-color: #F03663;
}

@media (max-width: 640px) {
  .page {
    margin: 16px auto 32px;
  }
  .calc-card {
    padding: 16px;
    border-radius: 8px;
  }
}

/* 版权信息样式 */
.copyright {
  text-align: center;
  padding: 20px;
  color: #666;
  font-size: 14px;
  border-top: 1px solid #e0e0e0;
  margin-top: 40px;
  background-color: #fff;
}