:root {
  --bg: #f8f9fa;
  --surface: #ffffff;
  --border: #e5e7eb;
  --text: #111827;
  --muted: #6b7280;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --success: #059669;
  --error: #dc2626;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", sans-serif;
}

.login-shell {
  width: min(100%, 440px);
  padding: 1.5rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1.75rem;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

h1 {
  margin: 0 0 0.5rem;
  font-size: 1.8rem;
}

.subtitle {
  margin: 0 0 1.5rem;
  color: var(--muted);
}

form {
  display: grid;
  gap: 1rem;
}

label {
  display: grid;
  gap: 0.45rem;
  font-size: 0.9rem;
  color: var(--muted);
}

input {
  width: 100%;
  padding: 0.8rem 0.9rem;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: 1rem;
  -webkit-appearance: none;
  appearance: none;
}

input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

button {
  padding: 0.8rem 1.1rem;
  border-radius: 10px;
  border: none;
  font-weight: 600;
  cursor: pointer;
  font-size: 0.95rem;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
  -webkit-user-select: none;
  user-select: none;
}

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

.btn-primary:hover {
  background: var(--accent-hover);
}

.btn-secondary {
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--border);
}

.status {
  padding: 0.75rem 0.9rem;
  border-radius: 8px;
  font-size: 0.88rem;
  border: 1px solid transparent;
  display: none;
}

.status.error {
  display: block;
  background: rgba(220, 38, 38, 0.1);
  border-color: rgba(220, 38, 38, 0.3);
  color: #7f1d1d;
}

.status.success {
  display: block;
  background: rgba(5, 150, 105, 0.1);
  border-color: rgba(5, 150, 105, 0.3);
  color: #065f46;
}

@media (max-width: 640px) {
  .login-shell {
    padding: 1rem;
  }

  .card {
    padding: 1.5rem 1.25rem;
    border-radius: 12px;
  }

  h1 {
    font-size: 1.5rem;
    margin-bottom: 0.4rem;
  }

  .subtitle {
    font-size: 0.9rem;
    margin-bottom: 1.25rem;
  }

  form {
    gap: 0.75rem;
  }

  label {
    gap: 0.35rem;
    font-size: 0.85rem;
  }

  input {
    padding: 0.75rem 0.85rem;
    font-size: 16px;
    border-radius: 8px;
  }

  .actions {
    flex-direction: column;
    gap: 0.5rem;
  }

  button {
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: 0.9rem;
    min-height: 44px;
  }

  .status {
    font-size: 0.8rem;
    padding: 0.65rem 0.85rem;
    margin-top: 1rem;
  }
}

@media (max-width: 420px) {
  .login-shell {
    padding: 0.75rem;
  }

  .card {
    padding: 1.25rem 1rem;
    border-radius: 10px;
  }

  h1 {
    font-size: 1.3rem;
    margin-bottom: 0.35rem;
  }

  .subtitle {
    font-size: 0.8rem;
    margin-bottom: 1rem;
  }

  label {
    font-size: 0.8rem;
  }

  input {
    padding: 0.7rem 0.75rem;
    font-size: 16px;
  }

  button {
    font-size: 0.85rem;
    padding: 0.7rem 0.9rem;
  }
}