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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 1rem;
}

.container {
  width: 100%;
  max-width: 420px;
  background: white;
  border-radius: 1.5rem;
  padding: 2rem;
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}

.title {
  text-align: center;
  font-size: 1.5rem;
  font-weight: 700;
  color: #1a1a2e;
  margin-bottom: 1.5rem;
}

.section { margin-bottom: 1rem; }

.hidden { display: none !important; }

/* Tabs */
.auth-tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.tab {
  flex: 1;
  padding: 0.75rem;
  border: 2px solid #e2e8f0;
  border-radius: 0.75rem;
  background: white;
  font-size: 0.9rem;
  font-weight: 600;
  color: #64748b;
  cursor: pointer;
  transition: all 0.2s;
}

.tab.active {
  border-color: #667eea;
  color: #667eea;
  background: #f0f4ff;
}

.tab-content { display: none; }
.tab-content.active { display: block; }

/* QR */
.hint {
  text-align: center;
  color: #64748b;
  font-size: 0.85rem;
  margin-bottom: 1rem;
}

.qr-container {
  display: flex;
  justify-content: center;
  padding: 1rem;
}

.qr-container canvas {
  border-radius: 0.5rem;
}

.status {
  text-align: center;
  font-size: 0.8rem;
  color: #94a3b8;
  margin-top: 0.75rem;
}

.status.success { color: #16a34a; }
.status.error { color: #dc2626; }

/* OTP Input */
.otp-input-group {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
}

.otp-input {
  width: 160px;
  padding: 0.75rem 1rem;
  font-size: 1.5rem;
  font-weight: 700;
  text-align: center;
  letter-spacing: 0.5em;
  border: 2px solid #e2e8f0;
  border-radius: 0.75rem;
  outline: none;
  transition: border-color 0.2s;
}

.otp-input:focus {
  border-color: #667eea;
}

.btn {
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 0.75rem;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-primary {
  background: #667eea;
  color: white;
}

.btn-primary:hover { background: #5a6fd6; }
.btn-primary:disabled { background: #cbd5e1; cursor: not-allowed; }

/* Timer */
.timer-bar {
  height: 4px;
  background: #e2e8f0;
  border-radius: 2px;
  overflow: hidden;
  margin-bottom: 0.5rem;
}

.timer-fill {
  height: 100%;
  background: linear-gradient(90deg, #667eea, #764ba2);
  border-radius: 2px;
  transition: width 1s linear;
  width: 100%;
}

.timer-text {
  text-align: center;
  font-size: 0.8rem;
  color: #64748b;
  margin-bottom: 1rem;
}

/* Drop Zone */
.drop-zone {
  border: 2px dashed #cbd5e1;
  border-radius: 1rem;
  padding: 2rem;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s;
  color: #94a3b8;
}

.drop-zone:hover, .drop-zone.drag-over {
  border-color: #667eea;
  background: #f8faff;
  color: #667eea;
}

.drop-zone-content p {
  margin-top: 0.75rem;
  font-size: 0.9rem;
}

/* File List */
.file-list {
  margin-top: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.file-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem;
  background: #f8fafc;
  border-radius: 0.75rem;
  font-size: 0.85rem;
}

.file-item .name {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: #334155;
}

.file-item .size {
  color: #94a3b8;
  font-size: 0.75rem;
  white-space: nowrap;
}

.file-item .status-icon {
  width: 20px;
  text-align: center;
}

.file-item .progress-bar {
  width: 60px;
  height: 4px;
  background: #e2e8f0;
  border-radius: 2px;
  overflow: hidden;
}

.file-item .progress-bar .fill {
  height: 100%;
  background: #667eea;
  border-radius: 2px;
  transition: width 0.3s;
}