:root {
  color-scheme: light;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #f4f6fb;
  color: #111827;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: linear-gradient(180deg, #eef2ff 0%, #f4f6fb 100%);
}

.container {
  max-width: 980px;
  margin: 0 auto;
  padding: 24px;
}

header {
  margin-bottom: 24px;
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 2.3vw, 2.8rem);
}

.subtitle {
  margin: 10px 0 0;
  color: #4b5563;
}

.card {
  background: #ffffff;
  border: 1px solid rgba(15, 23, 42, 0.08);
  border-radius: 16px;
  padding: 20px;
  margin-bottom: 18px;
  box-shadow: 0 12px 30px rgba(15, 23, 42, 0.06);
}

.card h2 {
  margin: 0 0 16px;
  font-size: 1.15rem;
}

.login-card {
  max-width: 420px;
  margin: 0 auto;
}

.login-form {
  display: grid;
  gap: 14px;
}

.login-form label {
  display: block;
  font-weight: 600;
  color: #111827;
}

.login-form input {
  width: 100%;
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid rgba(15, 23, 42, 0.12);
  background: #f8fafc;
  font-size: 1rem;
  color: #111827;
}

.error-text {
  margin: 0;
  color: #b91c1c;
  font-size: 0.95rem;
  min-height: 22px;
}

.status-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
  gap: 16px;
}

.status-row strong {
  color: #111827;
}

.qr-content {
  min-height: 280px;
  display: grid;
  place-items: center;
  border: 1px dashed rgba(15, 23, 42, 0.12);
  border-radius: 14px;
  padding: 16px;
  background: #f8fafc;
}

.qr-content img {
  max-width: 100%;
  height: auto;
}

.hint {
  margin: 14px 0 0;
  color: #6b7280;
}

.actions-card {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.button {
  border: none;
  background: #4338ca;
  color: #ffffff;
  padding: 12px 18px;
  border-radius: 10px;
  font-size: 0.98rem;
  cursor: pointer;
  transition: transform 0.16s ease, background 0.16s ease;
}

.button:hover {
  background: #312e81;
  transform: translateY(-1px);
}

.button-secondary {
  background: #e5e7eb;
  color: #111827;
}

.button-secondary:hover {
  background: #d1d5db;
}

.log-card pre {
  margin: 0;
  padding: 14px;
  border-radius: 12px;
  background: #111827;
  color: #f8fafc;
  font-size: 0.95rem;
  line-height: 1.55;
  max-height: 220px;
  overflow: auto;
}

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