/* Flash Photo Web - AI证件照在线版 */
:root {
  --primary: #4A90D9;
  --primary-dark: #357ABD;
  --bg: #F5F7FA;
  --card: #FFFFFF;
  --text: #333333;
  --text-secondary: #888888;
  --border: #E8ECF0;
  --success: #52C41A;
  --radius: 12px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  max-width: 640px;
  margin: 0 auto;
  padding: 0 16px;
  padding-bottom: 40px;
}

/* Header */
.header {
  text-align: center;
  padding: 32px 0 16px;
}
.logo {
  font-size: 28px;
  font-weight: 800;
  color: var(--primary);
}
.logo-sub {
  font-weight: 400;
  font-size: 18px;
  color: var(--text-secondary);
}
.tagline {
  font-size: 14px;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* Steps */
.step {
  background: var(--card);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 16px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}
.step-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}
.step-num {
  width: 28px;
  height: 28px;
  background: var(--primary);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 700;
}
.step-title {
  font-size: 18px;
  font-weight: 600;
}

/* Upload */
.upload-area {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 40px 20px;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s;
}
.upload-area:hover, .upload-area.dragover {
  border-color: var(--primary);
  background: #F0F7FF;
}
.upload-icon { font-size: 48px; margin-bottom: 12px; }
.upload-text { font-size: 16px; font-weight: 500; }
.upload-hint { font-size: 13px; color: var(--text-secondary); margin-top: 8px; }

.upload-preview {
  text-align: center;
}
.upload-preview img {
  max-width: 100%;
  max-height: 300px;
  border-radius: var(--radius);
  box-shadow: 0 4px 16px rgba(0,0,0,0.1);
}

/* Settings */
.setting-group {
  margin-bottom: 20px;
}
.setting-label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 10px;
}

/* Color Options */
.color-options {
  display: flex;
  gap: 12px;
}
.color-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 3px solid transparent;
  cursor: pointer;
  transition: all 0.2s;
}
.color-btn.active {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(74,144,217,0.3);
}

/* Spec Tabs */
.spec-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 12px;
}
.spec-tab {
  padding: 6px 16px;
  border: none;
  border-radius: 20px;
  background: #F0F0F0;
  color: #666;
  font-size: 14px;
  cursor: pointer;
}
.spec-tab.active {
  background: var(--primary);
  color: #fff;
}

/* Spec List */
.spec-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.spec-item {
  padding: 8px 14px;
  border: 2px solid var(--border);
  border-radius: 8px;
  font-size: 13px;
  cursor: pointer;
  transition: all 0.2s;
  background: #fff;
}
.spec-item:hover {
  border-color: var(--primary);
}
.spec-item.active {
  border-color: var(--primary);
  background: #F0F7FF;
  color: var(--primary);
  font-weight: 600;
}
.spec-item .spec-desc {
  font-size: 11px;
  color: var(--text-secondary);
  display: block;
}
.spec-item.active .spec-desc { color: var(--primary); }

/* Buttons */
.btn-primary {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 14px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  border: none;
  border-radius: 50px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  box-shadow: 0 4px 16px rgba(74,144,217,0.3);
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 6px 20px rgba(74,144,217,0.4); }
.btn-primary:active { transform: scale(0.98); }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

.btn-secondary {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 12px;
  background: #fff;
  color: var(--primary);
  border: 2px solid var(--primary);
  border-radius: 50px;
  font-size: 15px;
  cursor: pointer;
}

.btn-text {
  background: none;
  border: none;
  color: var(--primary);
  font-size: 14px;
  cursor: pointer;
  padding: 8px;
  margin-top: 8px;
}

/* Processing */
.processing-anim {
  text-align: center;
  padding: 40px 0;
}
.spinner {
  width: 60px;
  height: 60px;
  border: 4px solid #E8E8E8;
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto 20px;
}
@keyframes spin { to { transform: rotate(360deg); } }

.processing-text {
  font-size: 16px;
  font-weight: 500;
  margin-bottom: 16px;
}
.processing-steps {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  flex-wrap: wrap;
}
.p-step {
  font-size: 13px;
  color: #999;
  transition: color 0.3s;
}
.p-step.active { color: var(--primary); font-weight: 600; }
.p-step.done { color: var(--success); }
.p-arrow { color: #ddd; font-size: 12px; }

/* Result */
.result-container {
  text-align: center;
  margin-bottom: 20px;
}
.result-container canvas {
  max-width: 100%;
  border-radius: var(--radius);
  box-shadow: 0 8px 32px rgba(0,0,0,0.12);
}
.result-info {
  margin-top: 12px;
  font-size: 14px;
  color: var(--text-secondary);
}
.result-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

/* Features */
.features {
  margin-top: 32px;
  text-align: center;
}
.features h2 {
  font-size: 22px;
  margin-bottom: 20px;
}
.feature-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.feature-card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 20px 16px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}
.feature-icon { font-size: 32px; }
.feature-card h3 { font-size: 15px; margin: 8px 0 4px; }
.feature-card p { font-size: 12px; color: var(--text-secondary); }

/* Spec Guide */
.spec-guide, .faq {
  margin-top: 32px;
  background: var(--card);
  border-radius: var(--radius);
  padding: 24px 16px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}
.spec-guide h2, .faq h2 {
  font-size: 20px;
  margin-bottom: 16px;
  text-align: center;
}
.guide-table {
  font-size: 13px;
  width: 100%;
}
.guide-row {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr 1.5fr;
  padding: 10px 8px;
  border-bottom: 1px solid var(--border);
  gap: 4px;
}
.guide-row.header {
  font-weight: 700;
  color: var(--primary);
  font-size: 12px;
  text-transform: uppercase;
}
.guide-row:last-child { border-bottom: none; }
.guide-row span { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

/* FAQ */
.faq { margin-top: 16px; }
.faq-item {
  border-bottom: 1px solid var(--border);
  padding: 12px 0;
}
.faq-item:last-child { border-bottom: none; }
.faq-item summary {
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  color: var(--text);
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.faq-item summary::after { content: '+'; font-size: 20px; color: var(--primary); }
.faq-item[open] summary::after { content: '−'; }
.faq-item p {
  margin-top: 8px;
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* Footer */
.footer {
  text-align: center;
  padding: 32px 0;
  font-size: 13px;
  color: var(--text-secondary);
}
.footer a { color: var(--primary); text-decoration: none; }

/* Responsive */
@media (max-width: 480px) {
  body { padding: 0 12px; }
  .feature-grid { grid-template-columns: 1fr 1fr; gap: 8px; }
  .feature-card { padding: 16px 12px; }
}