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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    background: #f1f5f9;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.login-container {
    width: 100%;
    max-width: 600px;
    padding: 2rem;
}

.login-box {
    background: white;
    border-radius: 1.5rem;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    padding: 3.5rem 4rem;
}

.login-header {
    text-align: center;
    margin-bottom: 3rem;
}

.login-header h1 {
    font-size: 2rem;
    color: #1e293b;
    font-weight: 700;
    letter-spacing: 1px;
}

.login-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    margin-bottom: 0.5rem;
    color: #1e293b;
    font-weight: 500;
    font-size: 0.875rem;
}

.form-group input {
    padding: 1rem;
    border: 2px solid #e2e8f0;
    border-radius: 0.5rem;
    font-size: 1rem;
    transition: all 0.2s;
}

.form-group input:focus {
    outline: none;
    border-color: #2563eb;
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.btn-login {
    padding: 1rem;
    background: #2563eb;
    color: white;
    border: none;
    border-radius: 0.5rem;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.btn-login:hover {
    background: #1d4ed8;
}

.btn-login:active {
    transform: scale(0.98);
}

.error-message {
    color: #ef4444;
    font-size: 0.875rem;
    text-align: center;
    margin-top: 0.5rem;
    display: none;
}

.error-message.show {
    display: block;
}

.loading-spinner {
    text-align: center;
    padding: 3rem;
    color: #64748b;
    font-size: 1.1rem;
}

.loading-spinner::after {
    content: '';
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid #e2e8f0;
    border-top-color: #2563eb;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-left: 10px;
    vertical-align: middle;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}