:root {
  --bg: #f5f5f5;
  --card-bg: #ffffff;
  --text: #1a1a1a;
  --muted: #666666;
  --border: #e0e0e0;
  --focus: #0066cc;
  --error: #cc0000;
  --radius: 8px;
}

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

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

.container {
  width: 100%;
  max-width: 400px;
  padding: 16px;
}

.card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

h1 {
  font-size: 24px;
  font-weight: 600;
  margin-bottom: 24px;
  text-align: center;
}

.field {
  margin-bottom: 16px;
}

label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 6px;
  color: var(--muted);
}

input {
  width: 100%;
  padding: 10px 12px;
  font-size: 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  outline: none;
  transition: border-color 0.15s;
}

input:focus {
  border-color: var(--focus);
  box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.15);
}

.error {
  background: #fff0f0;
  color: var(--error);
  padding: 10px 12px;
  border-radius: var(--radius);
  font-size: 14px;
  margin-bottom: 16px;
}

button {
  width: 100%;
  padding: 12px;
  font-size: 16px;
  font-weight: 600;
  color: #fff;
  background: var(--focus);
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background 0.15s;
}

button:hover {
  background: #0052a3;
}