:root {
  --primary-color: #3b82f6;
  --primary-hover: #2563eb;
  --success-color: #10b981;
  --warning-color: #f59e0b;
  --error-color: #ef4444;
  --bg-color: #f9fafb;
  --card-bg: #ffffff;
  --border-color: #e5e7eb;
  --text-primary: #111827;
  --text-secondary: #6b7280;
  --text-tertiary: #9ca3af;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: var(--bg-color);
  color: var(--text-primary);
  line-height: 1.6;
}

.container {
  max-width: 840px;
  margin: 40px auto;
  padding: 0 20px;
}

/* Header */
h1 {
  text-align: center;
  font-size: 32px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.subtitle {
  text-align: center;
  color: var(--text-secondary);
  font-size: 14px;
  margin-bottom: 16px;
}

.nav-back {
  text-align: center;
  margin-bottom: 24px;
}

.btn-back {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.2s ease;
}

.btn-back:hover {
  background: #f3f4f6;
  border-color: var(--primary-color);
  color: var(--primary-color);
  transform: translateY(-1px);
}

/* Card */
.card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 24px;
  margin-bottom: 20px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05), 0 1px 2px rgba(0, 0, 0, 0.1);
  transition: box-shadow 0.2s ease;
}

.card:hover {
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.07), 0 2px 4px rgba(0, 0, 0, 0.06);
}

.card h2 {
  font-size: 18px;
  font-weight: 600;
  margin-top: 0;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.row {
  display: flex;
  gap: 24px;
  align-items: flex-start;
}

@media (max-width: 640px) {
  .row {
    flex-direction: column;
    align-items: center;
  }
}

/* QR Code Box */
.qr-box {
  position: relative;
  width: 260px;
  height: 260px;
  border: 2px dashed var(--border-color);
  border-radius: 12px;
  overflow: hidden;
  background: var(--bg-color);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
}

.qr-box.is-placeholder {
  background: repeating-linear-gradient(
    45deg,
    #f3f4f6,
    #f3f4f6 10px,
    #e5e7eb 10px,
    #e5e7eb 20px
  );
}

.qr-box.has-error {
  border-color: var(--error-color);
  background: #fef2f2;
}

.qr-box.is-loading {
  border-color: var(--primary-color);
  background: #eff6ff;
}

.qr-box.is-loading::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, rgba(59, 130, 246, 0.1), transparent);
  animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

.qr-box.is-placeholder::after {
  content: '暂无二维码';
  position: absolute;
  top: 50%;
  left: 0;
  width: 100%;
  transform: translateY(-50%);
  text-align: center;
  color: var(--text-tertiary);
  font-size: 14px;
  font-weight: 500;
}

#qrcode {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
  transition: opacity 0.3s ease;
}

.qr-box.is-loading #qrcode {
  opacity: 0.7;
}

/* Meta Section */
.meta {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 14px;
  min-width: 280px;
}

.meta-row {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.meta-label {
  font-weight: 600;
  color: var(--text-primary);
  font-size: 14px;
}

code {
  background: #f3f4f6;
  color: var(--primary-color);
  padding: 4px 10px;
  border-radius: 6px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 13px;
  word-break: break-all;
  border: 1px solid var(--border-color);
}

/* SK with copy button */
.sk-container {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1;
  min-width: 0;
}

.sk-value {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.copy-btn {
  flex-shrink: 0;
  padding: 4px 10px;
  font-size: 12px;
  border: 1px solid var(--border-color);
  background: var(--card-bg);
  border-radius: 6px;
  cursor: pointer;
  color: var(--text-secondary);
  transition: all 0.2s ease;
  white-space: nowrap;
}

.copy-btn:hover {
  background: #f3f4f6;
  color: var(--text-primary);
  border-color: var(--primary-color);
}

.copy-btn.copied {
  background: var(--success-color);
  color: white;
  border-color: var(--success-color);
}

/* Status */
.status {
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 8px;
  background: #f3f4f6;
  color: var(--text-secondary);
  transition: all 0.3s ease;
}

.status::before {
  content: '';
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-tertiary);
  flex-shrink: 0;
}

.status.is-loading {
  background: #eff6ff;
  color: var(--primary-color);
}

.status.is-loading::before {
  background: var(--primary-color);
  animation: pulse 1.5s ease-in-out infinite;
}

.status.is-success {
  background: #ecfdf5;
  color: var(--success-color);
}

.status.is-success::before {
  background: var(--success-color);
}

.status.is-error {
  background: #fef2f2;
  color: var(--error-color);
}

.status.is-error::before {
  background: var(--error-color);
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

/* Buttons */
.btn-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

button {
  padding: 10px 18px;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background: var(--card-bg);
  color: var(--text-primary);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

button:hover:not(:disabled) {
  background: #f3f4f6;
  border-color: var(--primary-color);
  color: var(--primary-color);
  transform: translateY(-1px);
}

button:active:not(:disabled) {
  transform: translateY(0);
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--primary-color);
  color: white;
  border-color: var(--primary-color);
}

.btn-primary:hover:not(:disabled) {
  background: var(--primary-hover);
  border-color: var(--primary-hover);
  color: white;
}

/* Progress Bar */
.progress-container {
  margin-top: 8px;
}

.progress-bar {
  height: 4px;
  background: var(--border-color);
  border-radius: 2px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: var(--primary-color);
  transition: width 0.3s ease;
  width: 0%;
}

.polling-info {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: var(--text-tertiary);
  margin-top: 4px;
}

/* Hint */
.hint {
  background: #fffbeb;
  border: 1px solid #fcd34d;
  border-radius: 8px;
  padding: 12px 14px;
  font-size: 13px;
  color: #92400e;
}

.hint strong {
  display: block;
  margin-bottom: 6px;
  color: #78350f;
}

.hint ul {
  margin: 6px 0 0 18px;
  padding: 0;
}

.hint li {
  margin: 4px 0;
}

/* User Card */
.userinfo {
  margin-top: 12px;
}

.user-card {
  display: flex;
  gap: 20px;
  align-items: center;
  padding: 20px;
  background: #f9fafb;
  border: 1px solid var(--border-color);
  border-radius: 12px;
  animation: fadeIn 0.4s ease;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.user-card .avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid white;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.user-card .meta {
  gap: 8px;
  min-width: 0;
}

.user-card .meta > div {
  font-size: 14px;
  color: var(--text-primary);
  display: flex;
  gap: 8px;
}

.user-card .meta b {
  color: var(--text-secondary);
  font-weight: 500;
  min-width: 70px;
}

/* Checkbox */
.checkbox-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 8px;
}

.checkbox-row input[type="checkbox"] {
  width: 16px;
  height: 16px;
  cursor: pointer;
}

.checkbox-row label {
  font-size: 13px;
  color: var(--text-secondary);
  cursor: pointer;
  user-select: none;
}