@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@300;400;500;700&display=swap');

:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #dbeafe;
  --success: #16a34a;
  --success-light: #dcfce7;
  --danger: #dc2626;
  --danger-light: #fee2e2;
  --warning: #d97706;
  --warning-light: #fef3c7;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-500: #6b7280;
  --gray-700: #374151;
  --gray-900: #111827;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-lg: 0 4px 12px rgba(0,0,0,0.1);
}

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

body {
  font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--gray-50);
  color: var(--gray-900);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* Header */
.header {
  background: linear-gradient(135deg, #1e40af, #3b82f6);
  color: white;
  padding: 20px 16px;
  text-align: center;
}
.header h1 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 4px;
}
.header p {
  font-size: 13px;
  opacity: 0.85;
}

/* Container */
.container {
  max-width: 480px;
  margin: 0 auto;
  padding: 16px;
}

/* Card */
.card {
  background: white;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
  margin-bottom: 16px;
}
.card-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.card-title .icon {
  font-size: 20px;
}

/* Steps */
.step {
  display: flex;
  gap: 12px;
  margin-bottom: 20px;
}
.step-num {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--primary);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 700;
  flex-shrink: 0;
}
.step-content { flex: 1; }
.step-content h3 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 4px;
}
.step-content p {
  font-size: 13px;
  color: var(--gray-500);
}

/* Form elements */
.form-group {
  margin-bottom: 16px;
}
.form-label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  color: var(--gray-700);
  margin-bottom: 6px;
}
.form-label .required {
  color: var(--danger);
  margin-left: 2px;
}
.form-hint {
  font-size: 12px;
  color: var(--gray-500);
  margin-top: 4px;
}
.form-input {
  width: 100%;
  padding: 10px 12px;
  border: 1.5px solid var(--gray-300);
  border-radius: 8px;
  font-size: 15px;
  font-family: inherit;
  transition: border-color 0.2s;
  background: white;
}
.form-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37,99,235,0.1);
}
.form-input::placeholder { color: var(--gray-300); }

/* Radio group */
.radio-group {
  display: flex;
  gap: 12px;
}
.radio-item {
  flex: 1;
  position: relative;
}
.radio-item input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}
.radio-item label {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px;
  border: 1.5px solid var(--gray-300);
  border-radius: 8px;
  font-size: 14px;
  cursor: pointer;
  transition: all 0.2s;
}
.radio-item label .dot {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 2px solid var(--gray-300);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.radio-item label .dot::after {
  content: '';
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--primary);
  transform: scale(0);
  transition: transform 0.2s;
}
.radio-item input:checked + label {
  border-color: var(--primary);
  background: var(--primary-light);
}
.radio-item input:checked + label .dot::after {
  transform: scale(1);
}

/* Upload area */
.upload-zone {
  border: 2px dashed var(--gray-300);
  border-radius: 8px;
  padding: 24px 16px;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s;
  position: relative;
}
.upload-zone:hover, .upload-zone.dragover {
  border-color: var(--primary);
  background: var(--primary-light);
}
.upload-zone input[type="file"] {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}
.upload-icon {
  font-size: 32px;
  margin-bottom: 8px;
}
.upload-text {
  font-size: 14px;
  color: var(--gray-700);
  font-weight: 500;
}
.upload-hint {
  font-size: 12px;
  color: var(--gray-500);
  margin-top: 4px;
}

/* File list */
.file-list {
  margin-top: 8px;
}
.file-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  background: var(--gray-50);
  border-radius: 6px;
  margin-bottom: 6px;
  font-size: 13px;
}
.file-item .file-name {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.file-item .file-remove {
  color: var(--gray-500);
  cursor: pointer;
  font-size: 18px;
  padding: 0 4px;
}
.file-item .file-remove:hover { color: var(--danger); }

/* Button */
.btn {
  display: block;
  width: 100%;
  padding: 14px;
  border: none;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.2s;
}
.btn-primary {
  background: var(--primary);
  color: white;
}
.btn-primary:hover { background: var(--primary-dark); }
.btn-primary:disabled {
  background: var(--gray-300);
  cursor: not-allowed;
}

/* Status message */
.status-msg {
  padding: 12px 16px;
  border-radius: 8px;
  font-size: 14px;
  margin-bottom: 16px;
  display: none;
}
.status-msg.success {
  display: block;
  background: var(--success-light);
  color: var(--success);
  border: 1px solid #bbf7d0;
}
.status-msg.error {
  display: block;
  background: var(--danger-light);
  color: var(--danger);
  border: 1px solid #fecaca;
}
.status-msg.info {
  display: block;
  background: var(--primary-light);
  color: var(--primary-dark);
  border: 1px solid #bfdbfe;
}

/* Footer */
.footer {
  text-align: center;
  padding: 20px 16px;
  font-size: 12px;
  color: var(--gray-500);
}

/* Info box */
.info-box {
  background: var(--primary-light);
  border-left: 3px solid var(--primary);
  padding: 12px 16px;
  border-radius: 0 8px 8px 0;
  font-size: 13px;
  color: var(--gray-700);
  margin-bottom: 16px;
  line-height: 1.8;
}
.info-box strong { color: var(--primary-dark); }

/* Progress */
.progress-bar {
  width: 100%;
  height: 6px;
  background: var(--gray-200);
  border-radius: 3px;
  overflow: hidden;
  margin-top: 12px;
  display: none;
}
.progress-bar .fill {
  height: 100%;
  background: var(--primary);
  border-radius: 3px;
  transition: width 0.5s;
  animation: progress-pulse 2s infinite;
}
@keyframes progress-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}

/* Download item */
.download-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px;
  border: 1.5px solid var(--gray-200);
  border-radius: 8px;
  margin-bottom: 12px;
  cursor: pointer;
  transition: all 0.2s;
}
.download-item:hover {
  border-color: var(--primary);
  background: var(--primary-light);
}
.download-item .dl-icon {
  font-size: 28px;
}
.download-item .dl-info { flex: 1; }
.download-item .dl-name { font-size: 14px; font-weight: 600; }
.download-item .dl-desc { font-size: 12px; color: var(--gray-500); }
.download-item .dl-arrow { color: var(--gray-400); font-size: 18px; }