/* ====== 变量 & 基础 ====== */
:root {
  --cream: #FFF8F0;
  --milk-tea: #D4A574;
  --milk-tea-dark: #B8864C;
  --milk-tea-light: #F5E6D3;
  --milk-tea-lighter: #FDF5ED;
  --text-primary: #3C2A1E;
  --text-secondary: #7A6652;
  --text-muted: #A89880;
  --accent: #C4956A;
  --accent-soft: #E8D5C4;
  --success: #6BA368;
  --white: #FFFFFF;
  --shadow: 0 2px 16px rgba(60,42,30,0.08);
  --shadow-lg: 0 8px 40px rgba(60,42,30,0.12);
  --radius: 12px;
  --radius-lg: 16px;
  --font-serif: 'Noto Serif SC', 'Songti SC', '宋体', 'SimSun', Georgia, serif;
  --font-handwrite: 'Ma Shan Zheng', 'KaiTi', '楷体', 'STKaiti', cursive;
  --font-body: -apple-system, BlinkMacSystemFont, 'Microsoft YaHei', '微软雅黑', 'Segoe UI', sans-serif;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: var(--font-body);
  background: linear-gradient(135deg, #FDF5ED 0%, #FFF8F0 30%, #F5E6D3 100%);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.7;
}

/* ====== Header ====== */
.header {
  background: var(--white);
  border-bottom: 1px solid var(--milk-tea-light);
  padding: 16px 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 1px 4px rgba(60,42,30,0.06);
}
.header-inner {
  max-width: 850px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
}
.logo { display: flex; align-items: center; }
.logo-link { display: inline-block; text-decoration: none; }
.logo-img { height: 36px; width: auto; display: block; }
.header-subtitle { font-size: 13px; color: var(--text-muted); }

/* ====== 步骤指示器 ====== */
.step-indicator {
  background: var(--white);
  border-bottom: 1px solid var(--milk-tea-light);
  padding: 20px 0 16px;
  position: sticky;
  top: 72px;
  z-index: 99;
}
.step-track {
  max-width: 850px;
  margin: 0 auto;
  padding: 0 32px;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  position: relative;
}
.step-track::before {
  content: '';
  position: absolute;
  top: 16px;
  left: 52px;
  right: 52px;
  height: 2px;
  background: var(--milk-tea-light);
}
.step-line {
  position: absolute;
  top: 16px;
  left: 52px;
  height: 2px;
  background: linear-gradient(90deg, var(--milk-tea), var(--milk-tea-dark));
  transition: width 0.5s ease;
  z-index: 1;
}
.step-dot {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  position: relative;
  z-index: 2;
}
.step-dot-inner {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 600;
  background: var(--white);
  border: 2px solid var(--milk-tea-light);
  color: var(--text-muted);
  transition: var(--transition);
}
.step-dot.active .step-dot-inner {
  background: var(--milk-tea);
  border-color: var(--milk-tea);
  color: var(--white);
}
.step-dot.current .step-dot-inner {
  border-color: var(--milk-tea-dark);
  box-shadow: 0 0 0 4px rgba(212,165,116,0.2);
}
.step-label {
  font-size: 12px;
  color: var(--text-muted);
  white-space: nowrap;
}
.step-dot.active .step-label { color: var(--text-primary); }
.step-dot.current .step-label { color: var(--milk-tea-dark); font-weight: 600; }

/* ====== Main ====== */
.main-container {
  max-width: 850px;
  margin: 0 auto;
  padding: 24px 24px 80px;
}

/* ====== Page ====== */
.page {
  animation: fadeSlideIn 0.4s ease;
}
@keyframes fadeSlideIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ====== Cover ====== */
.cover-page { padding-top: 40px; }
.cover-content { text-align: center; max-width: 600px; margin: 0 auto; }
.cover-badge {
  display: inline-block;
  background: var(--milk-tea-light);
  color: var(--milk-tea-dark);
  font-size: 13px;
  font-weight: 600;
  padding: 6px 16px;
  border-radius: 20px;
  margin-bottom: 20px;
  letter-spacing: 1px;
}
.cover-title { font-family: var(--font-serif); font-size: 30px; line-height: 1.4; margin-bottom: 16px; }
.cover-title .handwrite {
  display: block;
  font-family: var(--font-handwrite);
  font-size: 38px;
  color: var(--milk-tea-dark);
  font-weight: 400;
}
.cover-title .serif { display: block; font-weight: 700; color: var(--text-primary); }
.cover-divider { width: 60px; height: 3px; background: var(--milk-tea); margin: 16px auto 20px; }
.cover-desc { font-size: 15px; color: var(--text-secondary); line-height: 1.8; margin-bottom: 10px; }
.cover-features { display: flex; flex-direction: column; gap: 10px; margin: 24px 0 24px; }
.feature-item { display: flex; align-items: center; gap: 10px; font-size: 14px; color: var(--text-secondary); }
.feature-icon { font-size: 20px; }

/* 草稿提示 */
.draft-notice {
  background: var(--milk-tea-lighter);
  border: 1.5px dashed var(--milk-tea);
  border-radius: var(--radius);
  padding: 14px 20px;
  margin-bottom: 20px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-size: 14px;
  color: var(--text-secondary);
}
.draft-notice p { width: 100%; margin-bottom: 4px; }

/* ====== Form Page ====== */
.form-page {
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  padding: 36px 40px;
}
.page-header { margin-bottom: 28px; }
.page-number {
  display: inline-block;
  font-family: var(--font-serif);
  font-size: 44px;
  font-weight: 700;
  color: var(--milk-tea-light);
  line-height: 1;
  margin-bottom: 6px;
}
.form-page h2 { font-family: var(--font-serif); font-size: 22px; margin-bottom: 4px; }
.page-subtitle { color: var(--text-muted); font-size: 14px; }

/* ====== Form Elements ====== */
.form-group { margin-bottom: 22px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.form-label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}
.form-label.required::after { content: ' *'; color: #D4856A; }
.form-input {
  width: 100%;
  padding: 11px 15px;
  border: 1.5px solid var(--milk-tea-light);
  border-radius: var(--radius);
  font-size: 15px;
  font-family: var(--font-body);
  color: var(--text-primary);
  background: var(--milk-tea-lighter);
  transition: var(--transition);
  outline: none;
  -webkit-appearance: none;
}
.form-input:focus {
  border-color: var(--milk-tea);
  background: var(--white);
  box-shadow: 0 0 0 3px rgba(212,165,116,0.15);
}
.form-textarea { min-height: 90px; resize: vertical; }
select.form-input {
  cursor: pointer;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%23A89880' stroke-width='2' fill='none'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 36px;
}

/* ====== Rating ====== */
.rating-group { display: flex; gap: 14px; justify-content: center; }
.rating-group.small { gap: 8px; }
.rating-item { cursor: pointer; transition: var(--transition); }
.rating-star {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  border: 2px solid var(--milk-tea-light);
  border-radius: var(--radius);
  font-size: 17px;
  font-weight: 600;
  color: var(--text-muted);
  background: var(--white);
  transition: var(--transition);
}
.rating-item:hover .rating-star { border-color: var(--milk-tea); color: var(--milk-tea); }
.rating-item.active .rating-star { background: var(--milk-tea); border-color: var(--milk-tea); color: var(--white); }
.rating-item.small .rating-star { width: 36px; height: 36px; font-size: 14px; }
.rating-labels {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: var(--text-muted);
  max-width: 310px;
  margin: 6px auto 0;
}

/* ====== Pain Grid ====== */
.pain-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-bottom: 22px;
}
.pain-card {
  background: var(--milk-tea-lighter);
  border: 1.5px solid var(--milk-tea-light);
  border-radius: var(--radius);
  padding: 18px;
  text-align: center;
  transition: var(--transition);
}
.pain-card:hover { border-color: var(--milk-tea); }
.pain-icon { font-size: 26px; margin-bottom: 6px; }
.pain-label { font-weight: 600; font-size: 14px; margin-bottom: 3px; color: var(--text-primary); }
.pain-desc { font-size: 12px; color: var(--text-muted); margin-bottom: 10px; }

/* ====== Options ====== */
.option-group { display: flex; flex-direction: column; gap: 8px; }
.option-item {
  display: flex;
  flex-direction: column;
  padding: 13px 16px;
  border: 1.5px solid var(--milk-tea-light);
  border-radius: var(--radius);
  cursor: pointer;
  transition: var(--transition);
  background: var(--milk-tea-lighter);
}
.option-item:hover { border-color: var(--milk-tea); }
.option-item.active {
  border-color: var(--milk-tea-dark);
  background: var(--milk-tea-light);
}
.option-title { font-weight: 600; font-size: 14px; }
.option-desc { font-size: 12px; color: var(--text-muted); margin-top: 2px; }

/* ====== Checkbox Group（新增） ====== */
.checkbox-group {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.checkbox-item {
  padding: 8px 16px;
  border: 1.5px solid var(--milk-tea-light);
  border-radius: 20px;
  font-size: 13px;
  cursor: pointer;
  transition: var(--transition);
  background: var(--milk-tea-lighter);
  color: var(--text-secondary);
  user-select: none;
  display: flex;
  align-items: center;
  gap: 6px;
}
.checkbox-item:hover { border-color: var(--milk-tea); }
.checkbox-item.active {
  background: var(--milk-tea);
  border-color: var(--milk-tea);
  color: var(--white);
}
/* 视觉隐藏但可交互的 checkbox */
.sr-checkbox {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}
.checkbox-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: 1.5px solid currentColor;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: var(--transition);
}
.checkbox-item.active .checkbox-dot {
  background: var(--white);
  border-color: var(--white);
}

/* ====== Buttons ====== */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 26px;
  background: var(--milk-tea);
  color: var(--white);
  border: none;
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}
.btn-primary:hover { background: var(--milk-tea-dark); }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-large { padding: 15px 38px; font-size: 17px; border-radius: var(--radius-lg); }
.btn-submit { background: var(--text-primary); }
.btn-submit:hover { background: #5C4033; }
.btn-outline {
  padding: 8px 18px;
  border: 1.5px solid var(--milk-tea);
  border-radius: var(--radius);
  background: var(--white);
  color: var(--milk-tea-dark);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}
.btn-outline:hover { background: var(--milk-tea-lighter); }
.btn-text {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 14px;
  cursor: pointer;
  transition: var(--transition);
}
.btn-text:hover { color: var(--text-primary); }

.page-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 28px;
  border-top: 1px solid var(--milk-tea-light);
  margin-top: 36px;
}

/* ====== Success Page ====== */
.success-page { padding-top: 40px; }
.success-content { text-align: center; max-width: 520px; margin: 0 auto; }
.success-icon { font-size: 60px; margin-bottom: 16px; }
.success-title { font-family: var(--font-serif); font-size: 26px; margin-bottom: 10px; }
.success-desc { color: var(--text-secondary); line-height: 1.8; margin-bottom: 20px; }

/* CTA 卡片 */
.success-cta { margin-bottom: 20px; }
.cta-card {
  background: linear-gradient(135deg, var(--milk-tea-lighter), var(--milk-tea-light));
  border: 1.5px solid var(--milk-tea);
  border-radius: var(--radius-lg);
  padding: 24px;
  text-align: center;
}
.cta-icon { font-size: 36px; margin-bottom: 10px; }
.cta-card h3 { font-family: var(--font-serif); font-size: 18px; margin-bottom: 8px; color: var(--text-primary); }
.cta-card p { font-size: 14px; color: var(--text-secondary); line-height: 1.7; margin-bottom: 8px; }
.cta-contact { font-size: 14px; font-weight: 600; color: var(--milk-tea-dark); }

.success-info {
  background: var(--milk-tea-lighter);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 28px;
  font-size: 13px;
  color: var(--text-muted);
}

/* ====== Toast ====== */
.toast {
  position: fixed;
  top: 100px;
  left: 50%;
  transform: translateX(-50%) translateY(-20px);
  background: var(--text-primary);
  color: var(--white);
  padding: 12px 24px;
  border-radius: var(--radius);
  font-size: 14px;
  opacity: 0;
  pointer-events: none;
  transition: var(--transition);
  z-index: 999;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast.error { background: #C06040; }
.toast.success { background: var(--success); }

/* ====== Field Validation ====== */
.field-error {
  display: block;
  color: #C06040;
  font-size: 12px;
  margin-top: 4px;
  padding-left: 2px;
}
.input-error {
  border-color: #C06040 !important;
  background: #FFF5F5 !important;
}
.step-hint {
  font-size: 13px;
  color: #C4956A;
  background: var(--milk-tea-lighter);
  border-radius: 8px;
  padding: 8px 14px;
  margin-top: 12px;
  display: inline-block;
}

/* ====== QR Section ====== */
.qr-section {
  margin: 20px 0 24px;
  text-align: center;
}
.qr-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 12px;
}
.qr-container {
  display: flex;
  justify-content: center;
  margin-bottom: 8px;
}
.qr-container canvas {
  border: 3px solid var(--milk-tea);
  border-radius: 8px;
  padding: 8px;
  background: var(--white);
}
.qr-hint {
  font-size: 12px;
  color: var(--text-muted);
}

/* ====== Footer ====== */
.footer {
  text-align: center;
  padding: 28px 24px;
  color: var(--text-muted);
  font-size: 12px;
  line-height: 1.8;
}
.footer-links {
  margin-bottom: 6px;
}
.footer-links a {
  color: var(--milk-tea);
  text-decoration: none;
  font-size: 13px;
  font-weight: 500;
}
.footer-links a:hover { text-decoration: underline; }
.footer-divider {
  margin: 0 8px;
  color: var(--milk-tea-light);
}
.footer-security { color: var(--milk-tea-light); margin-top: 4px; }

/* ====== Responsive ====== */
@media (max-width: 768px) {
  .form-page { padding: 24px 20px; }
  .form-row { grid-template-columns: 1fr; gap: 0; }
  .form-row .form-group { margin-bottom: 16px; }
  .pain-grid { grid-template-columns: 1fr; }
  .cover-title { font-size: 22px; }
  .cover-title .handwrite { font-size: 30px; }
  .rating-star { width: 40px; height: 40px; font-size: 15px; }
  .rating-group { gap: 10px; }
  .page-number { font-size: 32px; }
  .step-track { padding: 0 16px; }
  .step-label { font-size: 11px; }
  .step-dot-inner { width: 28px; height: 28px; font-size: 11px; }
  .step-track::before { left: 36px; right: 36px; top: 14px; }
  .step-line { left: 36px; top: 14px; }
  .header-inner { flex-direction: column; gap: 4px; }
  .header-subtitle { font-size: 12px; }
  .checkbox-group { gap: 8px; }
  .checkbox-item { padding: 6px 12px; font-size: 12px; }
}

@media (max-width: 400px) {
  .form-page { padding: 18px 14px; }
  .rating-star { width: 36px; height: 36px; font-size: 13px; }
  .rating-group { gap: 6px; }
  .rating-item.small .rating-star { width: 32px; height: 32px; font-size: 12px; }
  .step-label { display: none; }
}