:root {
  --primary-color: #2c3e50;
  --accent-color: #3498db;
  --error-color: #e74c3c;
  --bg-color: #f0f2f5;
}

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

.login-wrapper { width: 100%; max-width: 400px; padding: 20px; }

.login-box {
  background: white;
  padding: 40px;
  border-radius: 12px;
  box-shadow: 0 10px 25px rgba(0,0,0,0.1);
}

.login-header { text-align: center; margin-bottom: 30px; }
.login-header h2 { color: var(--primary-color); margin-bottom: 10px; }
.login-header p { color: #777; font-size: 0.9rem; }

.input-group { margin-bottom: 20px; }
.input-group label { display: block; margin-bottom: 8px; font-weight: 600; color: #444; }
.input-group input {
  width: 100%;
  padding: 12px;
  border: 1px solid #ddd;
  border-radius: 6px;
  box-sizing: border-box; /* 패딩 포함 너비 계산 */
}

.options {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  margin-bottom: 25px;
  color: #666;
}

.login-btn {
  width: 100%;
  padding: 14px;
  background-color: var(--primary-color);
  color: white;
  border: none;
  border-radius: 6px;
  font-size: 1rem;
  font-weight: bold;
  cursor: pointer;
  transition: background 0.3s;
}

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

.error-msg {
  background-color: #fdeaea;
  color: var(--error-color);
  padding: 10px;
  border-radius: 4px;
  font-size: 0.85rem;
  margin-bottom: 20px;
  text-align: center;
}

.login-footer { margin-top: 25px; text-align: center; font-size: 0.9rem; color: #777; }
.login-footer a { color: var(--accent-color); text-decoration: none; }