/* 青藤·科创编程素养测评 — 移动优先样式 */
* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --primary: #4F7CFF;
  --primary-light: #E8EEFF;
  --primary-dark: #3459CC;
  --bg: #F5F7FA;
  --card: #FFFFFF;
  --text: #2C3E50;
  --text-light: #7F8C9B;
  --border: #E0E6ED;
  --success: #2ECC71;
  --radius: 16px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.page { display: none; min-height: 100vh; padding: 20px; }
.page.active { display: flex; flex-direction: column; align-items: center; }

/* 首页 */
.logo-area { text-align: center; margin: 40px 0 20px; }
.logo-icon { font-size: 48px; margin-bottom: 8px; }
.logo-area h1 { font-size: 24px; font-weight: 700; color: var(--primary); }
.subtitle { font-size: 13px; color: var(--text-light); margin-top: 4px; }

.intro-card { background: var(--card); border-radius: var(--radius); padding: 20px; width: 100%; max-width: 400px; margin-bottom: 24px; box-shadow: 0 2px 8px rgba(0,0,0,0.06); }
.intro-card p { font-size: 14px; line-height: 1.8; }
.intro-list { list-style: none; margin-top: 12px; }
.intro-list li { font-size: 14px; padding: 6px 0; border-bottom: 1px solid var(--border); }
.intro-list li:last-child { border-bottom: none; }

/* 按钮 */
.btn-primary {
  width: 100%; max-width: 400px; padding: 16px; border: none; border-radius: 12px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff; font-size: 17px; font-weight: 600; cursor: pointer;
  transition: transform 0.15s, opacity 0.15s;
}
.btn-primary:active { transform: scale(0.97); opacity: 0.9; }
.btn-primary:disabled { opacity: 0.5; }
.btn-secondary {
  padding: 12px 24px; border: 2px solid var(--primary); border-radius: 10px;
  background: #fff; color: var(--primary); font-size: 15px; font-weight: 600; cursor: pointer;
}
.btn-back { border: none; background: none; font-size: 15px; color: var(--primary); cursor: pointer; padding: 4px 8px; }

.footer-note { font-size: 12px; color: var(--text-light); margin: 20px 0 40px; text-align: center; }

/* 返回主页 */
.home-link {
  display: inline-block;
  margin: 0 auto 16px;
  padding: 8px 20px;
  color: #999;
  font-size: 13px;
  text-decoration: none;
  border: 1px solid #ddd;
  border-radius: 20px;
  transition: all 0.2s;
}
.home-link:hover { color: var(--primary); border-color: var(--primary); }

/* 顶部栏 */
.top-bar { width: 100%; max-width: 400px; display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; padding: 8px 0; }
.step-indicator { font-size: 13px; color: var(--text-light); background: var(--primary-light); padding: 4px 12px; border-radius: 20px; }

/* 年龄段选择 */
.age-options { width: 100%; max-width: 400px; display: flex; flex-direction: column; gap: 12px; margin: 16px 0; }
.age-card {
  background: var(--card); border: 2px solid var(--border); border-radius: var(--radius); padding: 20px;
  cursor: pointer; transition: all 0.2s; text-align: center;
}
.age-card:active { border-color: var(--primary); background: var(--primary-light); transform: scale(0.98); }
.age-icon { font-size: 36px; margin-bottom: 4px; }
.age-title { font-size: 18px; font-weight: 700; }
.age-desc { font-size: 14px; color: var(--primary); font-weight: 600; margin: 4px 0; }
.age-features { font-size: 12px; color: var(--text-light); }

/* 表单 */
.form-group { width: 100%; max-width: 400px; margin-bottom: 16px; }
.form-group label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 6px; color: var(--text); }
.form-group input, .form-group select {
  width: 100%; padding: 14px 16px; border: 2px solid var(--border); border-radius: 12px;
  font-size: 16px; background: var(--card); transition: border-color 0.2s; outline: none;
}
.form-group input:focus, .form-group select:focus { border-color: var(--primary); }

/* 答题 */
.progress-bar { width: 100%; max-width: 400px; height: 6px; background: var(--border); border-radius: 3px; margin-bottom: 16px; overflow: hidden; }
.progress-fill { height: 100%; background: linear-gradient(90deg, var(--primary), #6C63FF); border-radius: 3px; transition: width 0.3s ease; }

.dimension-tag {
  display: inline-block; padding: 6px 16px; border-radius: 20px;
  background: var(--primary-light); color: var(--primary); font-size: 13px; font-weight: 600; margin-bottom: 20px;
}

.question-area { width: 100%; max-width: 400px; flex: 1; }
.question-text { font-size: 17px; font-weight: 600; line-height: 1.8; margin-bottom: 24px; }

.question-image { text-align: center; margin: 0 0 20px; padding: 12px; background: #fafafa; border-radius: 12px; }
.question-image img { max-width: 100%; max-height: 280px; display: block; margin: 0 auto; }

.options { display: flex; flex-direction: column; gap: 10px; }
.option-item {
  padding: 16px; border: 2px solid var(--border); border-radius: 12px;
  font-size: 15px; cursor: pointer; transition: all 0.2s; background: var(--card);
}
.option-item:active { transform: scale(0.98); }
.option-item.selected { border-color: var(--primary); background: var(--primary-light); color: var(--primary); font-weight: 600; }

.quiz-footer { width: 100%; max-width: 400px; display: flex; justify-content: space-between; gap: 12px; margin-top: 24px; padding-bottom: 20px; }
.quiz-footer .btn-primary { flex: 1; }
.quiz-footer .btn-secondary { flex: 1; }

/* 结果页 */
.result-header { text-align: center; margin: 20px 0; }
.result-header h2 { font-size: 22px; }

.score-circle {
  width: 120px; height: 120px; border-radius: 50%;
  background: conic-gradient(var(--primary) 0deg, var(--primary-light) 0deg);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  margin: 16px auto; box-shadow: 0 4px 16px rgba(79,124,255,0.2);
}
.score-number { font-size: 36px; font-weight: 800; color: var(--primary); }
.score-label { font-size: 12px; color: var(--text-light); }

.radar-container { width: 100%; max-width: 320px; margin: 16px auto; }

.dimension-scores { width: 100%; max-width: 400px; }
.dim-item { display: flex; align-items: center; padding: 10px 0; border-bottom: 1px solid var(--border); }
.dim-name { flex: 1; font-size: 14px; font-weight: 600; }
.dim-bar-bg { flex: 2; height: 8px; background: var(--border); border-radius: 4px; margin: 0 12px; overflow: hidden; }
.dim-bar-fill { height: 100%; border-radius: 4px; transition: width 1s ease; }
.dim-score { font-size: 14px; font-weight: 700; width: 36px; text-align: right; }

.wechat-card {
  width: 100%; max-width: 400px; background: linear-gradient(135deg, #07C160, #06AD56);
  border-radius: var(--radius); padding: 20px; margin: 20px 0; text-align: center; color: #fff;
}
.wechat-title { font-size: 18px; font-weight: 700; margin-bottom: 12px; }
.conversion-message {
  background: rgba(255,255,255,0.15); border-radius: 10px; padding: 14px; margin-bottom: 14px;
  font-size: 13px; line-height: 1.8; text-align: left;
}
.wechat-qrcode { margin: 12px 0; }
.qr-img { width: 160px; height: 160px; border-radius: 8px; border: 2px solid rgba(255,255,255,0.3); }
.qr-hint { font-size: 13px; margin: 8px 0; opacity: 0.9; }
.wechat-tip { font-size: 12px; opacity: 0.8; margin-top: 4px; }

/* 页面切换动画 */
.page { animation: fadeIn 0.25s ease; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }