/* ========== 公共样式 ========== */
* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: #f0fdf4;
  color: #1f2937;
  line-height: 1.6;
}

a { color: #059669; text-decoration: none; }
a:hover { text-decoration: underline; }

h1, h2, h3 { color: #047857; }

/* 容器 */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
}

/* 卡片 */
.card {
  background: #fff;
  border-radius: 12px;
  padding: 24px;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.05);
  margin-bottom: 20px;
}

/* 按钮 */
.btn {
  display: inline-block;
  background: linear-gradient(135deg, #10b981, #059669);
  color: #fff;
  padding: 12px 28px;
  border: none;
  border-radius: 8px;
  font-size: 15px;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
}
.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(16, 185, 129, 0.3);
  text-decoration: none;
  color: #fff;
}

/* 输入框 */
input[type="text"], input[type="number"], select {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid #d1d5db;
  border-radius: 8px;
  font-size: 15px;
  transition: border-color 0.2s;
  outline: none;
}
input:focus, select:focus {
  border-color: #10b981;
}

label {
  display: block;
  margin-bottom: 6px;
  font-weight: 500;
  color: #374151;
}

.form-group {
  margin-bottom: 16px;
}

/* 工具卡片网格 */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 16px;
  margin: 20px 0;
}

.tool-card {
  background: #fff;
  border-radius: 12px;
  padding: 20px;
  text-align: center;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
  transition: transform 0.2s, box-shadow 0.2s;
  text-decoration: none;
  color: inherit;
  display: block;
}
.tool-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 20px rgba(16, 185, 129, 0.15);
  text-decoration: none;
}
.tool-card .icon {
  font-size: 36px;
  margin-bottom: 8px;
}
.tool-card h3 {
  margin: 8px 0 4px;
  font-size: 16px;
}
.tool-card p {
  margin: 0;
  font-size: 13px;
  color: #6b7280;
}

/* 结果区 */
.result-box {
  background: #ecfdf5;
  border-left: 4px solid #10b981;
  padding: 16px;
  border-radius: 8px;
  margin-top: 16px;
}

/* 移动端适配 */
@media (max-width: 640px) {
  .container { padding: 0 14px; }
  .card { padding: 18px; }
  .tools-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
}