html, body, main, header, footer {
  padding: 0px;
  margin: 0px;
}

/* ========== 计算器容器 ========== */
.calculator-container {
  max-width: 720px;
  margin: 0 auto;
  padding: 24px 16px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: #333333;
  background-color: #FAFAFA;
}

.app-title {
  text-align: center;
  font-size: 1.75rem;
  color: #E91E63;
  margin: 0 0 8px 0;
  font-weight: 700;
}

.app-subtitle {
  text-align: center;
  font-size: 0.95rem;
  color: #666666;
  margin: 0 0 28px 0;
}

/* ========== 输入区域 ========== */
.input-area {
  background: #FFFFFF;
  border-radius: 12px;
  padding: 24px 20px;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
  margin-bottom: 24px;
}

.input-group {
  margin-bottom: 20px;
}

.input-group label {
  display: block;
  font-size: 0.95rem;
  font-weight: 600;
  color: #444444;
  margin-bottom: 8px;
}

.input-field {
  width: 100%;
  padding: 10px 14px;
  font-size: 1rem;
  border: 1.5px solid #E0E0E0;
  border-radius: 8px;
  outline: none;
  transition: border-color 0.2s;
  box-sizing: border-box;
  background: #FAFAFA;
}

.input-field:focus {
  border-color: #E91E63;
  background: #FFFFFF;
}

/* 周期输入组 */
.cycle-input-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
}

.cycle-field {
  text-align: center;
  flex: 1;
  max-width: 100px;
}

.cycle-btn {
  width: 44px;
  height: 44px;
  border: 1.5px solid #E0E0E0;
  border-radius: 8px;
  background: #FFFFFF;
  font-size: 1.25rem;
  color: #E91E63;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
}

.cycle-btn:hover {
  background: #FCE4EC;
  border-color: #E91E63;
}

.cycle-btn:active {
  background: #F8BBD0;
}

/* 按钮组 */
.button-group {
  display: flex;
  gap: 12px;
  margin-top: 8px;
}

.btn {
  flex: 1;
  padding: 12px 20px;
  font-size: 1rem;
  font-weight: 600;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s;
  min-height: 48px;
}

.btn-primary {
  background: #E91E63;
  color: #FFFFFF;
}

.btn-primary:hover {
  background: #C2185B;
}

.btn-primary:active {
  background: #AD1457;
}

.btn-secondary {
  background: #F5F5F5;
  color: #666666;
  border: 1.5px solid #E0E0E0;
}

.btn-secondary:hover {
  background: #EEEEEE;
}

.btn-secondary:active {
  background: #E0E0E0;
}

/* ========== 结果区域 ========== */
.result-area {
  background: #FFFFFF;
  border-radius: 12px;
  padding: 24px 20px;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
  margin-bottom: 24px;
}

.result-title {
  font-size: 1.25rem;
  color: #333333;
  margin: 0 0 20px 0;
  padding-bottom: 12px;
  border-bottom: 2px solid #F5F5F5;
}

.result-card {
  border-radius: 10px;
  padding: 16px 18px;
  margin-bottom: 14px;
  border-left: 4px solid transparent;
}

.result-card:last-of-type {
  margin-bottom: 20px;
}

.result-label {
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.result-value {
  font-size: 1.1rem;
  font-weight: 700;
  color: #333333;
}

.result-desc {
  font-size: 0.85rem;
  color: #888888;
  margin-top: 4px;
}

/* 排卵日卡片 */
.result-card-info {
  background: #F3E5F5;
  border-left-color: #9C27B0;
}

.result-card-info .result-label {
  color: #7B1FA2;
}

.result-card-info .result-value {
  color: #6A1B9A;
}

/* 危险期卡片 */
.result-card-danger {
  background: #FFF3E0;
  border-left-color: #FF5722;
}

.result-card-danger .result-label {
  color: #E64A19;
}

.result-card-danger .result-value {
  color: #D84315;
}

/* 安全期卡片 */
.result-card-safe {
  background: #E8F5E9;
  border-left-color: #4CAF50;
}

.result-card-safe .result-label {
  color: #2E7D32;
}

.result-card-safe .result-value {
  color: #1B5E20;
  margin-bottom: 4px;
}

.safe-period-label {
  font-weight: 600;
  display: inline-block;
  margin-right: 4px;
}

/* 下次月经卡片 */
.result-card-period {
  background: #FFEBEE;
  border-left-color: #F44336;
}

.result-card-period .result-label {
  color: #C62828;
}

.result-card-period .result-value {
  color: #B71C1C;
}

/* ========== 风险提示 ========== */
.risk-warning {
  background: #FFFDE7;
  border: 2px solid #FFC107;
  border-radius: 10px;
  padding: 18px 20px;
  margin-top: 8px;
}

.risk-icon {
  font-size: 1.5rem;
  display: inline-block;
  margin-right: 8px;
  vertical-align: middle;
}

.risk-title {
  display: inline-block;
  font-size: 1.1rem;
  color: #F57F17;
  margin: 0 0 12px 0;
  vertical-align: middle;
}

.risk-list {
  margin: 0;
  padding-left: 20px;
}

.risk-list li {
  font-size: 0.9rem;
  color: #555555;
  line-height: 1.7;
  margin-bottom: 6px;
}

.risk-list li strong {
  color: #E65100;
}

/* ========== 底部内容区 ========== */
#features,
#scenarios,
#FAQ {
  max-width: 720px;
  margin: 0 auto 24px auto;
  padding: 20px 16px;
  background: #FFFFFF;
  border-radius: 12px;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
}

#features h2,
#scenarios h2,
#FAQ h2 {
  font-size: 1.15rem;
  color: #E91E63;
  margin: 0 0 12px 0;
  padding-bottom: 8px;
  border-bottom: 2px solid #FCE4EC;
}

#features p {
  font-size: 0.9rem;
  color: #555555;
  line-height: 1.8;
  margin: 0;
}

#scenarios ul {
  margin: 0;
  padding-left: 20px;
}

#scenarios li {
  font-size: 0.9rem;
  color: #555555;
  line-height: 1.8;
  margin-bottom: 8px;
}

#scenarios li strong {
  color: #333333;
}

#FAQ dl {
  margin: 0;
}

#FAQ dt {
  font-size: 0.95rem;
  font-weight: 600;
  color: #444444;
  margin-bottom: 4px;
  margin-top: 16px;
}

#FAQ dt:first-child {
  margin-top: 0;
}

#FAQ dd {
  font-size: 0.9rem;
  color: #666666;
  line-height: 1.7;
  margin: 0 0 4px 0;
  padding-left: 12px;
  border-left: 3px solid #FCE4EC;
}

/* fork 按钮区域 */
#__fork {
  text-align: center;
  margin-bottom: 28px;
}

#__fork button {
  padding: 10px 28px;
  font-size: 0.9rem;
  background: #F5F5F5;
  color: #E91E63;
  border: 1.5px solid #E91E63;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s;
}

#__fork button:hover {
  background: #FCE4EC;
}

/* ========== 页脚 ========== */
.page-info {
  text-align: center;
  font-size: 0.8rem;
  color: #999999;
  padding: 20px 16px;
}

.page-info a {
  color: #E91E63;
  text-decoration: none;
}

.page-info a:hover {
  text-decoration: underline;
}

/* ========== 响应式设计 ========== */
@media (max-width: 480px) {
  .calculator-container {
    padding: 16px 12px;
  }

  .app-title {
    font-size: 1.4rem;
  }

  .app-subtitle {
    font-size: 0.85rem;
  }

  .input-area {
    padding: 18px 14px;
  }

  .result-area {
    padding: 18px 14px;
  }

  .button-group {
    flex-direction: column;
    gap: 10px;
  }

  .result-value {
    font-size: 1rem;
  }

  .risk-warning {
    padding: 14px 16px;
  }
}